* [PATCH v4 01/27] xen/dts: Constify device_tree_flattened
2013-09-13 12:49 [PATCH v4 00/27] Allow Xen to boot with a raw device tree Julien Grall
@ 2013-09-13 12:49 ` Julien Grall
2013-09-13 12:49 ` [PATCH v4 02/27] xen/dts: Prefix device tree macro by dt_ Julien Grall
` (26 subsequent siblings)
27 siblings, 0 replies; 29+ messages in thread
From: Julien Grall @ 2013-09-13 12:49 UTC (permalink / raw)
To: xen-devel
Cc: patches, Julien Grall, ian.campbell, andre.przywara,
stefano.stabellini
The Flat Device Tree is given by the bootloader. Xen doesn't need to modify it.
Signed-off-by: Julien Grall <julien.grall@linaro.org>
---
Changes in v3:
- Fix compilation on arm64
---
xen/arch/arm/domain_build.c | 2 +-
xen/arch/arm/setup.c | 12 ++++++++----
xen/common/device_tree.c | 2 +-
xen/include/xen/device_tree.h | 2 +-
4 files changed, 11 insertions(+), 7 deletions(-)
diff --git a/xen/arch/arm/domain_build.c b/xen/arch/arm/domain_build.c
index 77e2a61..bde041e 100644
--- a/xen/arch/arm/domain_build.c
+++ b/xen/arch/arm/domain_build.c
@@ -475,7 +475,7 @@ static int map_devices_from_device_tree(struct domain *d)
static int prepare_dtb(struct domain *d, struct kernel_info *kinfo)
{
- void *fdt;
+ const void *fdt;
int new_size;
int ret;
paddr_t end;
diff --git a/xen/arch/arm/setup.c b/xen/arch/arm/setup.c
index 4b31623..aa87fb1 100644
--- a/xen/arch/arm/setup.c
+++ b/xen/arch/arm/setup.c
@@ -289,6 +289,7 @@ static void __init setup_mm(unsigned long dtb_paddr, size_t dtb_size)
unsigned long dtb_pages;
unsigned long boot_mfn_start, boot_mfn_end;
int i = 0;
+ void *fdt;
/* TODO: Handle non-contiguous memory bank */
if ( !early_info.mem.nr_banks )
@@ -363,8 +364,9 @@ static void __init setup_mm(unsigned long dtb_paddr, size_t dtb_size)
*
* TODO: handle other payloads too.
*/
- device_tree_flattened = mfn_to_virt(alloc_boot_pages(dtb_pages, 1));
- copy_from_paddr(device_tree_flattened, dtb_paddr, dtb_size, BUFFERABLE);
+ fdt = mfn_to_virt(alloc_boot_pages(dtb_pages, 1));
+ copy_from_paddr(fdt, dtb_paddr, dtb_size, BUFFERABLE);
+ device_tree_flattened = fdt;
/* Add non-xenheap memory */
s = ram_start;
@@ -410,6 +412,7 @@ static void __init setup_mm(unsigned long dtb_paddr, size_t dtb_size)
int bank;
unsigned long xenheap_pages = 0;
unsigned long dtb_pages;
+ void *fdt;
total_pages = 0;
for ( bank = 0 ; bank < early_info.mem.nr_banks; bank++ )
@@ -469,8 +472,9 @@ static void __init setup_mm(unsigned long dtb_paddr, size_t dtb_size)
*
* TODO: handle other payloads too.
*/
- device_tree_flattened = mfn_to_virt(alloc_boot_pages(dtb_pages, 1));
- copy_from_paddr(device_tree_flattened, dtb_paddr, dtb_size, BUFFERABLE);
+ fdt = mfn_to_virt(alloc_boot_pages(dtb_pages, 1));
+ copy_from_paddr(fdt, dtb_paddr, dtb_size, BUFFERABLE);
+ device_tree_flattened = fdt;
setup_frametable_mappings(ram_start, ram_end);
max_page = PFN_DOWN(ram_end);
diff --git a/xen/common/device_tree.c b/xen/common/device_tree.c
index c4f0f2c..a5abdaa 100644
--- a/xen/common/device_tree.c
+++ b/xen/common/device_tree.c
@@ -26,7 +26,7 @@
#include <asm/early_printk.h>
struct dt_early_info __initdata early_info;
-void *device_tree_flattened;
+const void *device_tree_flattened;
dt_irq_xlate_func dt_irq_xlate;
/* Host device tree */
struct dt_device_node *dt_host;
diff --git a/xen/include/xen/device_tree.h b/xen/include/xen/device_tree.h
index 5cc1905..2e5564e 100644
--- a/xen/include/xen/device_tree.h
+++ b/xen/include/xen/device_tree.h
@@ -164,7 +164,7 @@ typedef int (*device_tree_node_func)(const void *fdt,
void *data);
extern struct dt_early_info early_info;
-extern void *device_tree_flattened;
+extern const void *device_tree_flattened;
size_t __init device_tree_early_init(const void *fdt);
--
1.7.10.4
^ permalink raw reply related [flat|nested] 29+ messages in thread* [PATCH v4 02/27] xen/dts: Prefix device tree macro by dt_
2013-09-13 12:49 [PATCH v4 00/27] Allow Xen to boot with a raw device tree Julien Grall
2013-09-13 12:49 ` [PATCH v4 01/27] xen/dts: Constify device_tree_flattened Julien Grall
@ 2013-09-13 12:49 ` Julien Grall
2013-09-13 12:49 ` [PATCH v4 03/27] xen/dts: Don't add a fake property "name" in the device tree Julien Grall
` (25 subsequent siblings)
27 siblings, 0 replies; 29+ messages in thread
From: Julien Grall @ 2013-09-13 12:49 UTC (permalink / raw)
To: xen-devel
Cc: patches, Julien Grall, ian.campbell, andre.przywara,
stefano.stabellini
There is 2 macros: for_each_device_node and for_each_property_of_node
with a too generic name.
Also replace all call-site with the new function names.
Signed-off-by: Julien Grall <julien.grall@linaro.org>
---
xen/common/device_tree.c | 10 +++++-----
xen/include/xen/device_tree.h | 4 ++--
2 files changed, 7 insertions(+), 7 deletions(-)
diff --git a/xen/common/device_tree.c b/xen/common/device_tree.c
index a5abdaa..2c2dc52 100644
--- a/xen/common/device_tree.c
+++ b/xen/common/device_tree.c
@@ -624,7 +624,7 @@ struct dt_device_node *dt_find_node_by_name(struct dt_device_node *from,
struct dt_device_node *dt;
dt = from ? from->allnext : dt_host;
- for_each_device_node(dt, np)
+ dt_for_each_device_node(dt, np)
if ( np->name && (dt_node_cmp(np->name, name) == 0) )
break;
@@ -635,7 +635,7 @@ struct dt_device_node *dt_find_node_by_path(const char *path)
{
struct dt_device_node *np;
- for_each_device_node(dt_host, np)
+ dt_for_each_device_node(dt_host, np)
if ( np->full_name && (dt_node_cmp(np->full_name, path) == 0) )
break;
@@ -672,7 +672,7 @@ dt_find_compatible_node(struct dt_device_node *from,
struct dt_device_node *dt;
dt = from ? from->allnext : dt_host;
- for_each_device_node(dt, np)
+ dt_for_each_device_node(dt, np)
{
if ( type
&& !(np->type && (dt_node_cmp(np->type, type) == 0)) )
@@ -1009,7 +1009,7 @@ static const struct dt_device_node *dt_find_node_by_phandle(dt_phandle handle)
{
const struct dt_device_node *np;
- for_each_device_node(dt_host, np)
+ dt_for_each_device_node(dt_host, np)
if ( np->phandle == handle )
break;
@@ -1679,7 +1679,7 @@ static void __init dt_alias_scan(void)
if ( !aliases )
return;
- for_each_property_of_node( aliases, pp )
+ dt_for_each_property_node( aliases, pp )
{
const char *start = pp->name;
const char *end = start + strlen(start);
diff --git a/xen/include/xen/device_tree.h b/xen/include/xen/device_tree.h
index 2e5564e..ca8371e 100644
--- a/xen/include/xen/device_tree.h
+++ b/xen/include/xen/device_tree.h
@@ -236,10 +236,10 @@ struct dt_device_node * __init dt_find_interrupt_controller(const char *compat);
#define DT_ROOT_NODE_ADDR_CELLS_DEFAULT 2
#define DT_ROOT_NODE_SIZE_CELLS_DEFAULT 1
-#define for_each_property_of_node(dn, pp) \
+#define dt_for_each_property_node(dn, pp) \
for ( pp = dn->properties; pp != NULL; pp = pp->next )
-#define for_each_device_node(dt, dn) \
+#define dt_for_each_device_node(dt, dn) \
for ( dn = dt; dn != NULL; dn = dn->allnext )
/* Helper to read a big number; size is in cells (not bytes) */
--
1.7.10.4
^ permalink raw reply related [flat|nested] 29+ messages in thread* [PATCH v4 03/27] xen/dts: Don't add a fake property "name" in the device tree
2013-09-13 12:49 [PATCH v4 00/27] Allow Xen to boot with a raw device tree Julien Grall
2013-09-13 12:49 ` [PATCH v4 01/27] xen/dts: Constify device_tree_flattened Julien Grall
2013-09-13 12:49 ` [PATCH v4 02/27] xen/dts: Prefix device tree macro by dt_ Julien Grall
@ 2013-09-13 12:49 ` Julien Grall
2013-09-13 12:49 ` [PATCH v4 04/27] xen/dts: Add new helpers to use " Julien Grall
` (24 subsequent siblings)
27 siblings, 0 replies; 29+ messages in thread
From: Julien Grall @ 2013-09-13 12:49 UTC (permalink / raw)
To: xen-devel
Cc: patches, Julien Grall, ian.campbell, andre.przywara,
stefano.stabellini
On new Flat Device Tree version, the property "name" may not exist.
The property is never used in Xen code except to set the field "name" of
dt_device_node.
For convenience, remove the fake property. It will save space during the
creation of the dom0 FDT.
Signed-off-by: Julien Grall <julien.grall@linaro.org>
---
Changes in v3:
- Reduce the divergence with Linux code
---
xen/common/device_tree.c | 11 ++++++++++-
1 file changed, 10 insertions(+), 1 deletion(-)
diff --git a/xen/common/device_tree.c b/xen/common/device_tree.c
index 2c2dc52..61134fe 100644
--- a/xen/common/device_tree.c
+++ b/xen/common/device_tree.c
@@ -1563,8 +1563,17 @@ static unsigned long __init unflatten_dt_node(const void *fdt,
pp->name = "name";
pp->length = sz;
pp->value = pp + 1;
+ /*
+ * The device tree creation code assume that the property
+ * "name" is not a fake.
+ * To avoid a big divergence with Linux code, only remove
+ * property link. In this case we will lose a bit of memory
+ */
+#if 0
*prev_pp = pp;
prev_pp = &pp->next;
+#endif
+ np->name = pp->value;
memcpy(pp->value, ps, sz - 1);
((char *)pp->value)[sz - 1] = 0;
dt_dprintk("fixed up name for %s -> %s\n", pathp,
@@ -1574,7 +1583,7 @@ static unsigned long __init unflatten_dt_node(const void *fdt,
if ( allnextpp )
{
*prev_pp = NULL;
- np->name = dt_get_property(np, "name", NULL);
+ np->name = (np->name) ? : dt_get_property(np, "name", NULL);
np->type = dt_get_property(np, "device_type", NULL);
if ( !np->name )
--
1.7.10.4
^ permalink raw reply related [flat|nested] 29+ messages in thread* [PATCH v4 04/27] xen/dts: Add new helpers to use the device tree
2013-09-13 12:49 [PATCH v4 00/27] Allow Xen to boot with a raw device tree Julien Grall
` (2 preceding siblings ...)
2013-09-13 12:49 ` [PATCH v4 03/27] xen/dts: Don't add a fake property "name" in the device tree Julien Grall
@ 2013-09-13 12:49 ` Julien Grall
2013-09-13 12:49 ` [PATCH v4 05/27] xen: Use the right string comparison function in " Julien Grall
` (23 subsequent siblings)
27 siblings, 0 replies; 29+ messages in thread
From: Julien Grall @ 2013-09-13 12:49 UTC (permalink / raw)
To: xen-devel
Cc: patches, Julien Grall, ian.campbell, andre.przywara,
stefano.stabellini
List of new helpers taken from linux (commit 74b9272):
- dt_property_read_string
- dt_match_node
- dt_find_maching_node
- dt_device_is_available
- dt_prop_cmp
Other new helpers:
- dt_set_cell
- dt_for_each_child
- dt_set_range
- dt_cells_to_size
- dt_next_cell
- dt_get_range
- dt_node_name_is_equal
- dt_node_path_is_equal
- dt_property_name_is_equal
Signed-off-by: Julien Grall <julien.grall@linaro.org>
---
Changes in v3:
- Rename for_each_child to dt_for_each_child
- Use dt_for_each_device_node instead of for_each_device_node
Changes in v2:
- Update commit message
- Add for_each_child
- Add dt_get_range
- Update documentation
- Typoes
---
xen/common/device_tree.c | 109 +++++++++++++++++++++++++++--
xen/include/xen/device_tree.h | 151 ++++++++++++++++++++++++++++++++++++++++-
2 files changed, 252 insertions(+), 8 deletions(-)
diff --git a/xen/common/device_tree.c b/xen/common/device_tree.c
index 61134fe..7e451b1 100644
--- a/xen/common/device_tree.c
+++ b/xen/common/device_tree.c
@@ -182,23 +182,38 @@ void __init device_tree_get_reg(const u32 **cell, u32 address_cells,
get_val(cell, size_cells, size);
}
-static void __init set_val(u32 **cell, u32 cells, u64 val)
+void dt_get_range(const __be32 **cell, const struct dt_device_node *np,
+ u64 *address, u64 *size)
{
- u32 c = cells;
+ *address = dt_next_cell(dt_n_addr_cells(np), cell);
+ *size = dt_next_cell(dt_n_size_cells(np), cell);
+}
+
+void dt_set_cell(__be32 **cellp, int size, u64 val)
+{
+ int cells = size;
- while ( c-- )
+ while ( size-- )
{
- (*cell)[c] = cpu_to_fdt32(val);
+ (*cellp)[size] = cpu_to_fdt32(val);
val >>= 32;
}
- (*cell) += cells;
+
+ (*cellp) += cells;
}
void __init device_tree_set_reg(u32 **cell, u32 address_cells, u32 size_cells,
u64 start, u64 size)
{
- set_val(cell, address_cells, start);
- set_val(cell, size_cells, size);
+ dt_set_cell(cell, address_cells, start);
+ dt_set_cell(cell, size_cells, size);
+}
+
+void dt_set_range(__be32 **cellp, const struct dt_device_node *np,
+ u64 address, u64 size)
+{
+ dt_set_cell(cellp, dt_n_addr_cells(np), address);
+ dt_set_cell(cellp, dt_n_size_cells(np), size);
}
u32 __init device_tree_get_u32(const void *fdt, int node, const char *prop_name,
@@ -583,6 +598,23 @@ bool_t dt_property_read_u32(const struct dt_device_node *np,
return 1;
}
+int dt_property_read_string(const struct dt_device_node *np,
+ const char *propname, const char **out_string)
+{
+ const struct dt_property *pp = dt_find_property(np, propname, NULL);
+
+ if ( !pp )
+ return -EINVAL;
+ if ( !pp->value )
+ return -ENODATA;
+ if ( strnlen(pp->value, pp->length) >= pp->length )
+ return -EILSEQ;
+
+ *out_string = pp->value;
+
+ return 0;
+}
+
bool_t dt_device_is_compatible(const struct dt_device_node *device,
const char *compat)
{
@@ -655,6 +687,34 @@ struct dt_device_node *dt_find_node_by_alias(const char *alias)
return NULL;
}
+bool_t dt_match_node(const struct dt_device_match *matches,
+ const struct dt_device_node *node)
+{
+ if ( !matches )
+ return 0;
+
+ while ( matches->path || matches->type || matches->compatible )
+ {
+ bool_t match = 1;
+
+ if ( matches->path )
+ match &= dt_node_path_is_equal(node, matches->path);
+
+ if ( matches->type )
+ match &= dt_device_type_is_equal(node, matches->type);
+
+ if ( matches->compatible )
+ match &= dt_device_is_compatible(node, matches->compatible);
+
+ if ( match )
+ return match;
+
+ matches++;
+ }
+
+ return 0;
+}
+
const struct dt_device_node *dt_get_parent(const struct dt_device_node *node)
{
if ( !node )
@@ -684,6 +744,23 @@ dt_find_compatible_node(struct dt_device_node *from,
return np;
}
+struct dt_device_node *
+dt_find_matching_node(struct dt_device_node *from,
+ const struct dt_device_match *matches)
+{
+ struct dt_device_node *np;
+ struct dt_device_node *dt;
+
+ dt = from ? from->allnext : dt_host;
+ dt_for_each_device_node(dt, np)
+ {
+ if ( dt_match_node(matches, np) )
+ return np;
+ }
+
+ return NULL;
+}
+
int dt_n_addr_cells(const struct dt_device_node *np)
{
const __be32 *ip;
@@ -1372,6 +1449,24 @@ int dt_device_get_irq(const struct dt_device_node *device, int index,
return dt_irq_translate(&raw, out_irq);
}
+bool_t dt_device_is_available(const struct dt_device_node *device)
+{
+ const char *status;
+ u32 statlen;
+
+ status = dt_get_property(device, "status", &statlen);
+ if ( status == NULL )
+ return 1;
+
+ if ( statlen > 0 )
+ {
+ if ( !strcmp(status, "okay") || !strcmp(status, "ok") )
+ return 1;
+ }
+
+ return 0;
+}
+
/**
* unflatten_dt_node - Alloc and populate a device_node from the flat tree
* @fdt: The parent device tree blob
diff --git a/xen/include/xen/device_tree.h b/xen/include/xen/device_tree.h
index ca8371e..91caf1f 100644
--- a/xen/include/xen/device_tree.h
+++ b/xen/include/xen/device_tree.h
@@ -54,6 +54,19 @@ struct dt_early_info {
struct dt_module_info modules;
};
+/*
+ * Struct used for matching a device
+ */
+struct dt_device_match {
+ const char *path;
+ const char *type;
+ const char *compatible;
+};
+
+#define DT_MATCH_PATH(p) { .path = p }
+#define DT_MATCH_TYPE(typ) { .type = typ }
+#define DT_MATCH_COMPATIBLE(compat) { .compatible = compat }
+
typedef u32 dt_phandle;
/**
@@ -229,6 +242,7 @@ extern const struct dt_device_node *dt_interrupt_controller;
*/
struct dt_device_node * __init dt_find_interrupt_controller(const char *compat);
+#define dt_prop_cmp(s1, s2) strcmp((s1), (s2))
#define dt_node_cmp(s1, s2) strcmp((s1), (s2))
#define dt_compat_cmp(s1, s2, l) strnicmp((s1), (s2), l)
@@ -242,6 +256,9 @@ struct dt_device_node * __init dt_find_interrupt_controller(const char *compat);
#define dt_for_each_device_node(dt, dn) \
for ( dn = dt; dn != NULL; dn = dn->allnext )
+#define dt_for_each_child_node(dt, dn) \
+ for ( dn = dt->child; dn != NULL; dn = dn->sibling )
+
/* Helper to read a big number; size is in cells (not bytes) */
static inline u64 dt_read_number(const __be32 *cell, int size)
{
@@ -252,6 +269,20 @@ static inline u64 dt_read_number(const __be32 *cell, int size)
return r;
}
+/* Helper to convert a number of cells in bytes */
+static inline int dt_cells_to_size(int size)
+{
+ return (size * sizeof (u32));
+}
+
+static inline u64 dt_next_cell(int s, const __be32 **cellp)
+{
+ const __be32 *p = *cellp;
+
+ *cellp = p + s;
+ return dt_read_number(p, s);
+}
+
static inline const char *dt_node_full_name(const struct dt_device_node *np)
{
return (np && np->full_name) ? np->full_name : "<no-node>";
@@ -262,6 +293,18 @@ static inline const char *dt_node_name(const struct dt_device_node *np)
return (np && np->name) ? np->name : "<no-node>";
}
+static inline bool_t dt_node_name_is_equal(const struct dt_device_node *np,
+ const char *name)
+{
+ return !dt_node_cmp(np->name, name);
+}
+
+static inline bool_t dt_node_path_is_equal(const struct dt_device_node *np,
+ const char *path)
+{
+ return !dt_node_cmp(np->full_name, path);
+}
+
static inline bool_t
dt_device_type_is_equal(const struct dt_device_node *device,
const char *type)
@@ -281,6 +324,12 @@ static inline domid_t dt_device_used_by(const struct dt_device_node *device)
return device->used_by;
}
+static inline bool_t dt_property_name_is_equal(const struct dt_property *pp,
+ const char *name)
+{
+ return !dt_prop_cmp(pp->name, name);
+}
+
/**
* dt_find_compatible_node - Find a node based on type and one of the
* tokens in its "compatible" property
@@ -315,6 +364,23 @@ const void *dt_get_property(const struct dt_device_node *np,
*/
bool_t dt_property_read_u32(const struct dt_device_node *np,
const char *name, u32 *out_value);
+/**
+ * dt_property_read_string - Find and read a string from a property
+ * @np: Device node from which the property value is to be read
+ * @propname: Name of the property to be searched
+ * @out_string: Pointer to null terminated return string, modified only
+ * if return value if 0.
+ *
+ * Search for a property in a device tree node and retrieve a null
+ * terminated string value (pointer to data, not a copy). Returns 0 on
+ * success, -EINVAL if the property does not exist, -ENODATA if property
+ * doest not have value, and -EILSEQ if the string is not
+ * null-terminated with the length of the property data.
+ *
+ * The out_string pointer is modified only if a valid string can be decoded.
+ */
+int dt_property_read_string(const struct dt_device_node *np,
+ const char *propname, const char **out_string);
/**
* Checks if the given "compat" string matches one of the strings in
@@ -450,4 +516,87 @@ int dt_n_size_cells(const struct dt_device_node *np);
*/
int dt_n_addr_cells(const struct dt_device_node *np);
-#endif
+/**
+ * dt_device_is_available - Check if a device is available for use
+ *
+ * @device: Node to check for availability
+ *
+ * Returns true if the status property is absent or set to "okay" or "ok",
+ * false otherwise.
+ */
+bool_t dt_device_is_available(const struct dt_device_node *device);
+
+/**
+ * dt_match_node - Tell if a device_node has a matching of dt_device_match
+ * @matches: array of dt_device_match structures to search in
+ * @node: the dt_device_node structure to match against
+ *
+ * Returns true if the device node match one of dt_device_match.
+ */
+bool_t dt_match_node(const struct dt_device_match *matches,
+ const struct dt_device_node *node);
+
+/**
+ * dt_find_matching_node - Find a node based on an dt_device_match match table
+ * @from: The node to start searching from or NULL, the node you pass
+ * will not be searched, only the next one will; typically, you pass
+ * what the returned call returned
+ * @matches: array of dt_device_match structures to search in
+ *
+ * Returns a node pointer.
+ */
+struct dt_device_node *
+dt_find_matching_node(struct dt_device_node *from,
+ const struct dt_device_match *matches);
+
+/**
+ * dt_set_cell - Write a value into a series of cells
+ *
+ * @cellp: Pointer to cells
+ * @size: number of cells to write the value
+ * @value: number to write
+ *
+ * Write a value into a series of cells and update cellp to point to the
+ * cell just after.
+ */
+void dt_set_cell(__be32 **cellp, int size, u64 val);
+
+/**
+ * dt_set_range - Write range into a series of cells
+ *
+ * @cellp: Pointer to cells
+ * @np: Node which contains the encoding for the address and the size
+ * @address: Start of range
+ * @size: Size of the range
+ *
+ * Write a range into a series of cells and update cellp to point to the
+ * cell just after.
+ */
+void dt_set_range(__be32 **cellp, const struct dt_device_node *np,
+ u64 address, u64 size);
+
+/**
+ * dt_get_range - Read a range (address/size) from a series of cells
+ *
+ * @cellp: Pointer to cells
+ * @np Node which contains the encoding for the addresss and the size
+ * @address: Address filled by this function
+ * @size: Size filled by this function
+ *
+ * WARNING: This function should not be used to decode an address
+ * This function reads a range (address/size) from a series of cells and
+ * update cellp to point to the cell just after.
+ */
+void dt_get_range(const __be32 **cellp, const struct dt_device_node *np,
+ u64 *address, u64 *size);
+
+#endif /* __XEN_DEVICE_TREE_H */
+
+/*
+ * Local variables:
+ * mode: C
+ * c-file-style: "BSD"
+ * c-basic-offset: 4
+ * indent-tabs-mode: nil
+ * End:
+ */
--
1.7.10.4
^ permalink raw reply related [flat|nested] 29+ messages in thread* [PATCH v4 05/27] xen: Use the right string comparison function in device tree
2013-09-13 12:49 [PATCH v4 00/27] Allow Xen to boot with a raw device tree Julien Grall
` (3 preceding siblings ...)
2013-09-13 12:49 ` [PATCH v4 04/27] xen/dts: Add new helpers to use " Julien Grall
@ 2013-09-13 12:49 ` Julien Grall
2013-09-13 12:49 ` [PATCH v4 06/27] xen/dts: Remove device_get_reg call in process_cpu_node Julien Grall
` (22 subsequent siblings)
27 siblings, 0 replies; 29+ messages in thread
From: Julien Grall @ 2013-09-13 12:49 UTC (permalink / raw)
To: xen-devel
Cc: patches, Julien Grall, ian.campbell, andre.przywara,
stefano.stabellini
When of_node_cmp and of_compat_cmp was introduced in commit fb97eb6
"xen/arm: Create a hierarchical device tree", they were copied from the wrong
Linux header.
Signed-off-by: Julien Grall <julien.grall@linaro.org>
Acked-by: Ian Campbell <ian.campbell@citrix.com>
---
Changes in v3:
- This patch depends on "xen/dts: Add new helpers...". Move the
patch later.
---
xen/common/device_tree.c | 6 +++---
xen/include/xen/device_tree.h | 4 ++--
2 files changed, 5 insertions(+), 5 deletions(-)
diff --git a/xen/common/device_tree.c b/xen/common/device_tree.c
index 7e451b1..a73eee8 100644
--- a/xen/common/device_tree.c
+++ b/xen/common/device_tree.c
@@ -144,7 +144,7 @@ bool_t __init device_tree_node_compatible(const void *fdt, int node,
return 0;
while ( len > 0 ) {
- if ( !dt_compat_cmp(prop, match, mlen) )
+ if ( !dt_compat_cmp(prop, match) )
return 1;
l = strlen(prop) + 1;
prop += l;
@@ -564,7 +564,7 @@ dt_find_property(const struct dt_device_node *np,
for ( pp = np->properties; pp; pp = pp->next )
{
- if ( strcmp(pp->name, name) == 0 )
+ if ( dt_prop_cmp(pp->name, name) == 0 )
{
if ( lenp )
*lenp = pp->length;
@@ -626,7 +626,7 @@ bool_t dt_device_is_compatible(const struct dt_device_node *device,
return 0;
while ( cplen > 0 )
{
- if ( dt_compat_cmp(cp, compat, strlen(compat)) == 0 )
+ if ( dt_compat_cmp(cp, compat) == 0 )
return 1;
l = strlen(cp) + 1;
cp += l;
diff --git a/xen/include/xen/device_tree.h b/xen/include/xen/device_tree.h
index 91caf1f..5a51ab6 100644
--- a/xen/include/xen/device_tree.h
+++ b/xen/include/xen/device_tree.h
@@ -243,8 +243,8 @@ extern const struct dt_device_node *dt_interrupt_controller;
struct dt_device_node * __init dt_find_interrupt_controller(const char *compat);
#define dt_prop_cmp(s1, s2) strcmp((s1), (s2))
-#define dt_node_cmp(s1, s2) strcmp((s1), (s2))
-#define dt_compat_cmp(s1, s2, l) strnicmp((s1), (s2), l)
+#define dt_node_cmp(s1, s2) strcasecmp((s1), (s2))
+#define dt_compat_cmp(s1, s2) strcasecmp((s1), (s2))
/* Default #address and #size cells */
#define DT_ROOT_NODE_ADDR_CELLS_DEFAULT 2
--
1.7.10.4
^ permalink raw reply related [flat|nested] 29+ messages in thread* [PATCH v4 06/27] xen/dts: Remove device_get_reg call in process_cpu_node
2013-09-13 12:49 [PATCH v4 00/27] Allow Xen to boot with a raw device tree Julien Grall
` (4 preceding siblings ...)
2013-09-13 12:49 ` [PATCH v4 05/27] xen: Use the right string comparison function in " Julien Grall
@ 2013-09-13 12:49 ` Julien Grall
2013-09-13 12:49 ` [PATCH v4 07/27] xen/dts: Check "reg" property length in process_multiboot_node Julien Grall
` (21 subsequent siblings)
27 siblings, 0 replies; 29+ messages in thread
From: Julien Grall @ 2013-09-13 12:49 UTC (permalink / raw)
To: xen-devel
Cc: patches, Julien Grall, ian.campbell, andre.przywara,
stefano.stabellini
The "reg" property is only composed of one uint32. device_get_reg can be
replaced by dt_read_number.
Signed-off-by: Julien Grall <julien.grall@linaro.org>
Acked-by: Ian Campbell <ian.campbell@citrix.com>
---
Changes in v2:
- Rework the commit message
---
xen/common/device_tree.c | 19 ++++++++++++-------
1 file changed, 12 insertions(+), 7 deletions(-)
diff --git a/xen/common/device_tree.c b/xen/common/device_tree.c
index a73eee8..f867dfd 100644
--- a/xen/common/device_tree.c
+++ b/xen/common/device_tree.c
@@ -426,21 +426,26 @@ static void __init process_cpu_node(const void *fdt, int node,
u32 address_cells, u32 size_cells)
{
const struct fdt_property *prop;
- const u32 *cell;
- paddr_t start, size;
-
+ u32 cpuid;
+ int len;
- prop = fdt_get_property(fdt, node, "reg", NULL);
+ prop = fdt_get_property(fdt, node, "reg", &len);
if ( !prop )
{
early_printk("fdt: node `%s': missing `reg' property\n", name);
return;
}
- cell = (const u32 *)prop->data;
- device_tree_get_reg(&cell, address_cells, size_cells, &start, &size);
+ if ( len < sizeof (cpuid) )
+ {
+ dt_printk("fdt: node `%s': `reg` property length is too short\n",
+ name);
+ return;
+ }
+
+ cpuid = dt_read_number((const __be32 *)prop->data, 1);
- cpumask_set_cpu(start, &cpu_possible_map);
+ cpumask_set_cpu(cpuid, &cpu_possible_map);
}
static void __init process_multiboot_node(const void *fdt, int node,
--
1.7.10.4
^ permalink raw reply related [flat|nested] 29+ messages in thread* [PATCH v4 07/27] xen/dts: Check "reg" property length in process_multiboot_node
2013-09-13 12:49 [PATCH v4 00/27] Allow Xen to boot with a raw device tree Julien Grall
` (5 preceding siblings ...)
2013-09-13 12:49 ` [PATCH v4 06/27] xen/dts: Remove device_get_reg call in process_cpu_node Julien Grall
@ 2013-09-13 12:49 ` Julien Grall
2013-09-13 12:49 ` [PATCH v4 08/27] xen/dts: Check the CPU ID is not greater than NR_CPUS Julien Grall
` (20 subsequent siblings)
27 siblings, 0 replies; 29+ messages in thread
From: Julien Grall @ 2013-09-13 12:49 UTC (permalink / raw)
To: xen-devel
Cc: patches, Julien Grall, ian.campbell, andre.przywara,
stefano.stabellini
The device tree compiler (dtc) will only warn if the "reg" property doesn't
match #address-cells and #size-cells size. It won't update the different
property. Therefore, Xen needs to check if the size match both properties,
otherwise Xen can retrieve a wrong range.
Signed-off-by: Julien Grall <julien.grall@linaro.org>
---
Changes in v3:
- Rework comment
---
xen/common/device_tree.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/xen/common/device_tree.c b/xen/common/device_tree.c
index f867dfd..9d300ec 100644
--- a/xen/common/device_tree.c
+++ b/xen/common/device_tree.c
@@ -467,10 +467,14 @@ static void __init process_multiboot_node(const void *fdt, int node,
mod = &early_info.modules.module[nr];
- prop = fdt_get_property(fdt, node, "reg", NULL);
+ prop = fdt_get_property(fdt, node, "reg", &len);
if ( !prop )
early_panic("node %s missing `reg' property\n", name);
+ if ( len < dt_cells_to_size(address_cells + size_cells) )
+ early_panic("fdt: node `%s': `reg` property length is too short\n",
+ name);
+
cell = (const u32 *)prop->data;
device_tree_get_reg(&cell, address_cells, size_cells,
&mod->start, &mod->size);
--
1.7.10.4
^ permalink raw reply related [flat|nested] 29+ messages in thread* [PATCH v4 08/27] xen/dts: Check the CPU ID is not greater than NR_CPUS
2013-09-13 12:49 [PATCH v4 00/27] Allow Xen to boot with a raw device tree Julien Grall
` (6 preceding siblings ...)
2013-09-13 12:49 ` [PATCH v4 07/27] xen/dts: Check "reg" property length in process_multiboot_node Julien Grall
@ 2013-09-13 12:49 ` Julien Grall
2013-09-13 12:49 ` [PATCH v4 09/27] xen/video: hdlcd: Convert the driver to the new device tree API Julien Grall
` (19 subsequent siblings)
27 siblings, 0 replies; 29+ messages in thread
From: Julien Grall @ 2013-09-13 12:49 UTC (permalink / raw)
To: xen-devel
Cc: patches, Julien Grall, ian.campbell, andre.przywara,
stefano.stabellini
On some board CPU IDs are not contiguous (for instance the Versatile Express
with big.LITTLE supports). If the CPU ID is greater than NR_CPUS Xen will hang
without any message. This is because console driver is not yet initialized and
hypervisor data abort uses printk.
For the moment check the CPU ID and print an warning if an error occured.
Signed-off-by: Julien Grall <julien.grall@linaro.org>
Acked-by: Ian Campbell <ian.campbell@citrix.com>
---
xen/common/device_tree.c | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/xen/common/device_tree.c b/xen/common/device_tree.c
index 9d300ec..d2262ce 100644
--- a/xen/common/device_tree.c
+++ b/xen/common/device_tree.c
@@ -445,6 +445,13 @@ static void __init process_cpu_node(const void *fdt, int node,
cpuid = dt_read_number((const __be32 *)prop->data, 1);
+ /* TODO: handle non-contiguous CPU ID */
+ if ( cpuid >= NR_CPUS )
+ {
+ dt_printk("fdt: node `%s': reg(0x%x) >= NR_CPUS(%d)\n",
+ name, cpuid, NR_CPUS);
+ return;
+ }
cpumask_set_cpu(cpuid, &cpu_possible_map);
}
--
1.7.10.4
^ permalink raw reply related [flat|nested] 29+ messages in thread* [PATCH v4 09/27] xen/video: hdlcd: Convert the driver to the new device tree API
2013-09-13 12:49 [PATCH v4 00/27] Allow Xen to boot with a raw device tree Julien Grall
` (7 preceding siblings ...)
2013-09-13 12:49 ` [PATCH v4 08/27] xen/dts: Check the CPU ID is not greater than NR_CPUS Julien Grall
@ 2013-09-13 12:49 ` Julien Grall
2013-09-13 12:49 ` [PATCH v4 10/27] xen/video: hdlcd: Use early_printk instead of printk Julien Grall
` (18 subsequent siblings)
27 siblings, 0 replies; 29+ messages in thread
From: Julien Grall @ 2013-09-13 12:49 UTC (permalink / raw)
To: xen-devel
Cc: patches, Julien Grall, ian.campbell, andre.przywara,
stefano.stabellini
Avoid to use FDT API which will be removed soon
Signed-off-by: Julien Grall <julien.grall@linaro.org>
Acked-by: Ian campbell <ian.campbell@citrix.com>
---
Changes in v2:
- Move s/printk/early_printk changes to a new patch
- hdlcd_start and hdlcd_size are physical address
- Update early printk to use HDLCD instead of hdlcd
---
xen/drivers/video/arm_hdlcd.c | 46 +++++++++++++++++++++++------------------
1 file changed, 26 insertions(+), 20 deletions(-)
diff --git a/xen/drivers/video/arm_hdlcd.c b/xen/drivers/video/arm_hdlcd.c
index 72979ea..ab464c6 100644
--- a/xen/drivers/video/arm_hdlcd.c
+++ b/xen/drivers/video/arm_hdlcd.c
@@ -25,6 +25,7 @@
#include <xen/libfdt/libfdt.h>
#include <xen/init.h>
#include <xen/mm.h>
+#include <asm/early_printk.h>
#include "font.h"
#include "lfb.h"
#include "modelines.h"
@@ -96,47 +97,52 @@ static int __init get_color_masks(const char* bpp, struct color_masks **masks)
static void __init set_pixclock(uint32_t pixclock)
{
- if ( device_tree_node_compatible(device_tree_flattened, 0, "arm,vexpress") )
+ if ( dt_find_compatible_node(NULL, NULL, "arm,vexpress") )
vexpress_syscfg(1, V2M_SYS_CFG_OSC_FUNC,
V2M_SYS_CFG_OSC5, &pixclock);
}
void __init video_init(void)
{
- int node, depth;
- u32 address_cells, size_cells;
struct lfb_prop lfbp;
unsigned char *lfb;
paddr_t hdlcd_start, hdlcd_size;
paddr_t framebuffer_start, framebuffer_size;
- const struct fdt_property *prop;
- const u32 *cell;
const char *mode_string;
char _mode_string[16];
int bytes_per_pixel = 4;
struct color_masks *c = NULL;
struct modeline *videomode = NULL;
int i;
+ const struct dt_device_node *dev;
+ const __be32 *cells;
+ u32 lenp;
+ int res;
- if ( find_compatible_node("arm,hdlcd", &node, &depth,
- &address_cells, &size_cells) <= 0 )
- return;
+ dev = dt_find_compatible_node(NULL, NULL, "arm,hdlcd");
- prop = fdt_get_property(device_tree_flattened, node, "reg", NULL);
- if ( !prop )
+ if ( !dev )
+ {
+ early_printk("HDLCD: Cannot find node compatible with \"arm,hdcld\"\n");
return;
+ }
- cell = (const u32 *)prop->data;
- device_tree_get_reg(&cell, address_cells, size_cells,
- &hdlcd_start, &hdlcd_size);
+ res = dt_device_get_address(dev, 0, &hdlcd_start, &hdlcd_size);
+ if ( !res )
+ {
+ early_printk("HDLCD: Unable to retrieve MMIO base address\n");
+ return;
+ }
- prop = fdt_get_property(device_tree_flattened, node, "framebuffer", NULL);
- if ( !prop )
+ cells = dt_get_property(dev, "framebuffer", &lenp);
+ if ( !cells )
+ {
+ early_printk("HDLCD: Unable to retrieve framebuffer property\n");
return;
+ }
- cell = (const u32 *)prop->data;
- device_tree_get_reg(&cell, address_cells, size_cells,
- &framebuffer_start, &framebuffer_size);
+ framebuffer_start = dt_next_cell(dt_n_addr_cells(dev), &cells);
+ framebuffer_size = dt_next_cell(dt_n_size_cells(dev), &cells);
if ( !hdlcd_start )
{
@@ -150,8 +156,8 @@ void __init video_init(void)
return;
}
- mode_string = fdt_getprop(device_tree_flattened, node, "mode", NULL);
- if ( !mode_string )
+ res = dt_property_read_string(dev, "mode", &mode_string);
+ if ( res )
{
get_color_masks("32", &c);
memcpy(_mode_string, "1280x1024@60", strlen("1280x1024@60") + 1);
--
1.7.10.4
^ permalink raw reply related [flat|nested] 29+ messages in thread* [PATCH v4 10/27] xen/video: hdlcd: Use early_printk instead of printk
2013-09-13 12:49 [PATCH v4 00/27] Allow Xen to boot with a raw device tree Julien Grall
` (8 preceding siblings ...)
2013-09-13 12:49 ` [PATCH v4 09/27] xen/video: hdlcd: Convert the driver to the new device tree API Julien Grall
@ 2013-09-13 12:49 ` Julien Grall
2013-09-13 12:49 ` [PATCH v4 11/27] xen/arm: Use dt_device_match to avoid multiple if conditions Julien Grall
` (17 subsequent siblings)
27 siblings, 0 replies; 29+ messages in thread
From: Julien Grall @ 2013-09-13 12:49 UTC (permalink / raw)
To: xen-devel
Cc: patches, Julien Grall, ian.campbell, andre.przywara,
stefano.stabellini
The video driver is initialized before the console is correctly set up.
Therefore, printk will never output if there is no serial configured.
Signed-off-by: Julien Grall <julien.grall@linaro.org>
---
xen/drivers/video/arm_hdlcd.c | 23 ++++++++++++-----------
1 file changed, 12 insertions(+), 11 deletions(-)
diff --git a/xen/drivers/video/arm_hdlcd.c b/xen/drivers/video/arm_hdlcd.c
index ab464c6..dffda9a 100644
--- a/xen/drivers/video/arm_hdlcd.c
+++ b/xen/drivers/video/arm_hdlcd.c
@@ -146,13 +146,13 @@ void __init video_init(void)
if ( !hdlcd_start )
{
- printk(KERN_ERR "HDLCD address missing from device tree, disabling driver\n");
+ early_printk(KERN_ERR "HDLCD: address missing from device tree, disabling driver\n");
return;
}
if ( !hdlcd_start || !framebuffer_start )
{
- printk(KERN_ERR "HDLCD: framebuffer address missing from device tree, disabling driver\n");
+ early_printk(KERN_ERR "HDLCD: framebuffer address missing from device tree, disabling driver\n");
return;
}
@@ -166,27 +166,27 @@ void __init video_init(void)
else if ( strlen(mode_string) < strlen("800x600@60") ||
strlen(mode_string) > sizeof(_mode_string) - 1 )
{
- printk(KERN_ERR "HDLCD: invalid modeline=%s\n", mode_string);
+ early_printk(KERN_ERR "HDLCD: invalid modeline=%s\n", mode_string);
return;
} else {
char *s = strchr(mode_string, '-');
if ( !s )
{
- printk(KERN_INFO "HDLCD: bpp not found in modeline %s, assume 32 bpp\n",
- mode_string);
+ early_printk(KERN_INFO "HDLCD: bpp not found in modeline %s, assume 32 bpp\n",
+ mode_string);
get_color_masks("32", &c);
memcpy(_mode_string, mode_string, strlen(mode_string) + 1);
bytes_per_pixel = 4;
} else {
if ( strlen(s) < 6 )
{
- printk(KERN_ERR "HDLCD: invalid mode %s\n", mode_string);
+ early_printk(KERN_ERR "HDLCD: invalid mode %s\n", mode_string);
return;
}
s++;
if ( get_color_masks(s, &c) < 0 )
{
- printk(KERN_WARNING "HDLCD: unsupported bpp %s\n", s);
+ early_printk(KERN_WARNING "HDLCD: unsupported bpp %s\n", s);
return;
}
bytes_per_pixel = simple_strtoll(s, NULL, 10) / 8;
@@ -205,22 +205,23 @@ void __init video_init(void)
}
if ( !videomode )
{
- printk(KERN_WARNING "HDLCD: unsupported videomode %s\n", _mode_string);
+ early_printk(KERN_WARNING "HDLCD: unsupported videomode %s\n",
+ _mode_string);
return;
}
if ( framebuffer_size < bytes_per_pixel * videomode->xres * videomode->yres )
{
- printk(KERN_ERR "HDLCD: the framebuffer is too small, disabling the HDLCD driver\n");
+ early_printk(KERN_ERR "HDLCD: the framebuffer is too small, disabling the HDLCD driver\n");
return;
}
- printk(KERN_INFO "Initializing HDLCD driver\n");
+ early_printk(KERN_INFO "Initializing HDLCD driver\n");
lfb = ioremap_wc(framebuffer_start, framebuffer_size);
if ( !lfb )
{
- printk(KERN_ERR "Couldn't map the framebuffer\n");
+ early_printk(KERN_ERR "Couldn't map the framebuffer\n");
return;
}
memset(lfb, 0x00, bytes_per_pixel * videomode->xres * videomode->yres);
--
1.7.10.4
^ permalink raw reply related [flat|nested] 29+ messages in thread* [PATCH v4 11/27] xen/arm: Use dt_device_match to avoid multiple if conditions
2013-09-13 12:49 [PATCH v4 00/27] Allow Xen to boot with a raw device tree Julien Grall
` (9 preceding siblings ...)
2013-09-13 12:49 ` [PATCH v4 10/27] xen/video: hdlcd: Use early_printk instead of printk Julien Grall
@ 2013-09-13 12:49 ` Julien Grall
2013-09-13 12:49 ` [PATCH v4 12/27] xen/dts: dt_find_interrupt_controller: accept multiple compatible strings Julien Grall
` (16 subsequent siblings)
27 siblings, 0 replies; 29+ messages in thread
From: Julien Grall @ 2013-09-13 12:49 UTC (permalink / raw)
To: xen-devel
Cc: patches, Julien Grall, ian.campbell, andre.przywara,
stefano.stabellini
There is some place in Xen ARM code where multiple if conditions is used
check the presence of a node or find a node.
These pieces of code can be replace by an array and using proper device tree
helpers.
Signed-off-by: Julien Grall <julien.grall@linaro.org>
---
Changes in v3:
- Create a macro DT_MATCH_TIMER. Will be use later
- Remove spurious line in the patch
Changes in v2:
- Move skip_match and timer_ids within the appropriate functions
---
xen/arch/arm/domain_build.c | 11 ++++++++---
xen/arch/arm/time.c | 9 ++++++---
xen/include/asm-arm/time.h | 4 ++++
3 files changed, 18 insertions(+), 6 deletions(-)
diff --git a/xen/arch/arm/domain_build.c b/xen/arch/arm/domain_build.c
index bde041e..8ebe1bc 100644
--- a/xen/arch/arm/domain_build.c
+++ b/xen/arch/arm/domain_build.c
@@ -437,15 +437,20 @@ static int map_device(struct domain *d, const struct dt_device_node *dev)
static int handle_node(struct domain *d, const struct dt_device_node *np)
{
+ static const struct dt_device_match skip_matches[] __initconst =
+ {
+ DT_MATCH_COMPATIBLE("xen,xen"),
+ DT_MATCH_TYPE("memory"),
+ DT_MATCH_PATH("/chosen"),
+ { /* sentinel */ },
+ };
const struct dt_device_node *child;
int res;
DPRINT("handle %s\n", dt_node_full_name(np));
/* Skip theses nodes and the sub-nodes */
- if ( dt_device_is_compatible(np, "xen,xen") ||
- dt_device_type_is_equal(np, "memory") ||
- !strcmp("/chosen", dt_node_full_name(np)) )
+ if ( dt_match_node(skip_matches, np ) )
return 0;
if ( dt_device_used_by(np) != DOMID_XEN )
diff --git a/xen/arch/arm/time.c b/xen/arch/arm/time.c
index 9c176cd..eb3ad5c 100644
--- a/xen/arch/arm/time.c
+++ b/xen/arch/arm/time.c
@@ -101,14 +101,17 @@ static uint32_t calibrate_timer(void)
/* Set up the timer on the boot CPU */
int __init init_xen_time(void)
{
+ static const struct dt_device_match timer_ids[] __initconst =
+ {
+ DT_MATCH_TIMER,
+ { /* sentinel */ },
+ };
struct dt_device_node *dev;
int res;
unsigned int i;
u32 rate;
- dev = dt_find_compatible_node(NULL, NULL, "arm,armv7-timer");
- if ( !dev )
- dev = dt_find_compatible_node(NULL, NULL, "arm,armv8-timer");
+ dev = dt_find_matching_node(NULL, timer_ids);
if ( !dev )
panic("Unable to find a compatible timer in the device tree\n");
diff --git a/xen/include/asm-arm/time.h b/xen/include/asm-arm/time.h
index f7aa868..9d302d3 100644
--- a/xen/include/asm-arm/time.h
+++ b/xen/include/asm-arm/time.h
@@ -1,6 +1,10 @@
#ifndef __ARM_TIME_H__
#define __ARM_TIME_H__
+#define DT_MATCH_TIMER \
+ DT_MATCH_COMPATIBLE("arm,armv7-timer"), \
+ DT_MATCH_COMPATIBLE("arm,armv8-timer")
+
typedef unsigned long cycles_t;
static inline cycles_t get_cycles (void)
--
1.7.10.4
^ permalink raw reply related [flat|nested] 29+ messages in thread* [PATCH v4 12/27] xen/dts: dt_find_interrupt_controller: accept multiple compatible strings
2013-09-13 12:49 [PATCH v4 00/27] Allow Xen to boot with a raw device tree Julien Grall
` (10 preceding siblings ...)
2013-09-13 12:49 ` [PATCH v4 11/27] xen/arm: Use dt_device_match to avoid multiple if conditions Julien Grall
@ 2013-09-13 12:49 ` Julien Grall
2013-09-13 12:49 ` [PATCH v4 13/27] xen/arm: Build DOM0 FDT by browsing the device tree structure Julien Grall
` (15 subsequent siblings)
27 siblings, 0 replies; 29+ messages in thread
From: Julien Grall @ 2013-09-13 12:49 UTC (permalink / raw)
To: xen-devel
Cc: patches, Julien Grall, ian.campbell, andre.przywara,
stefano.stabellini
Signed-off-by: Julien Grall <julien.grall@linaro.org>
---
xen/arch/arm/gic.c | 7 ++++++-
xen/common/device_tree.c | 5 +++--
xen/include/asm-arm/gic.h | 2 ++
xen/include/xen/device_tree.h | 3 ++-
4 files changed, 13 insertions(+), 4 deletions(-)
diff --git a/xen/arch/arm/gic.c b/xen/arch/arm/gic.c
index 7c24811..aff57b9 100644
--- a/xen/arch/arm/gic.c
+++ b/xen/arch/arm/gic.c
@@ -355,10 +355,15 @@ int gic_irq_xlate(const u32 *intspec, unsigned int intsize,
/* Set up the GIC */
void __init gic_init(void)
{
+ static const struct dt_device_match gic_ids[] __initconst =
+ {
+ DT_MATCH_GIC,
+ { /* sentinel */ },
+ };
struct dt_device_node *node;
int res;
- node = dt_find_interrupt_controller("arm,cortex-a15-gic");
+ node = dt_find_interrupt_controller(gic_ids);
if ( !node )
panic("Unable to find compatible GIC in the device tree\n");
diff --git a/xen/common/device_tree.c b/xen/common/device_tree.c
index d2262ce..215592e 100644
--- a/xen/common/device_tree.c
+++ b/xen/common/device_tree.c
@@ -1834,11 +1834,12 @@ static void __init dt_alias_scan(void)
}
}
-struct dt_device_node * __init dt_find_interrupt_controller(const char *compat)
+struct dt_device_node * __init
+dt_find_interrupt_controller(const struct dt_device_match *matches)
{
struct dt_device_node *np = NULL;
- while ( (np = dt_find_compatible_node(np, NULL, compat)) )
+ while ( (np = dt_find_matching_node(np, matches)) )
{
if ( !dt_find_property(np, "interrupt-controller", NULL) )
continue;
diff --git a/xen/include/asm-arm/gic.h b/xen/include/asm-arm/gic.h
index 513c1fc..92a3349 100644
--- a/xen/include/asm-arm/gic.h
+++ b/xen/include/asm-arm/gic.h
@@ -135,6 +135,8 @@
#ifndef __ASSEMBLY__
#include <xen/device_tree.h>
+#define DT_MATCH_GIC DT_MATCH_COMPATIBLE("arm,cortex-a15-gic")
+
extern int domain_vgic_init(struct domain *d);
extern void domain_vgic_free(struct domain *d);
diff --git a/xen/include/xen/device_tree.h b/xen/include/xen/device_tree.h
index 5a51ab6..fae9f97 100644
--- a/xen/include/xen/device_tree.h
+++ b/xen/include/xen/device_tree.h
@@ -240,7 +240,8 @@ extern const struct dt_device_node *dt_interrupt_controller;
*
* If found, return the interrupt controller device node.
*/
-struct dt_device_node * __init dt_find_interrupt_controller(const char *compat);
+struct dt_device_node * __init
+dt_find_interrupt_controller(const struct dt_device_match *matches);
#define dt_prop_cmp(s1, s2) strcmp((s1), (s2))
#define dt_node_cmp(s1, s2) strcasecmp((s1), (s2))
--
1.7.10.4
^ permalink raw reply related [flat|nested] 29+ messages in thread* [PATCH v4 13/27] xen/arm: Build DOM0 FDT by browsing the device tree structure
2013-09-13 12:49 [PATCH v4 00/27] Allow Xen to boot with a raw device tree Julien Grall
` (11 preceding siblings ...)
2013-09-13 12:49 ` [PATCH v4 12/27] xen/dts: dt_find_interrupt_controller: accept multiple compatible strings Julien Grall
@ 2013-09-13 12:49 ` Julien Grall
2013-09-13 12:49 ` [PATCH v4 14/27] xen/arm: Don't map disabled device in DOM0 Julien Grall
` (14 subsequent siblings)
27 siblings, 0 replies; 29+ messages in thread
From: Julien Grall @ 2013-09-13 12:49 UTC (permalink / raw)
To: xen-devel
Cc: patches, Julien Grall, ian.campbell, andre.przywara,
stefano.stabellini
Remove the usage of the FDT in benefit of the device tree structure.
The latter is easier to use and can embedded meta-data for Xen (ie: is the
device is used by Xen...).
Signed-off-by: Julien Grall <julien.grall@linaro.org>
---
Changes in v4:
- rename set_interrupts to set_interrupt_ppi
- rename interrupt_t to gic_interrupt_t
- add fdt_property_interrupts
Changes in v3:
- use dt_for_each_node_property instea of for_each_node_of_property
Changes in v2:
- use dt_set_range
- add set_interrupts
- add more debug print
- add comment to explain why some device are not mapped
- mix kbasename directly in handle_node
- fix malloc check when memory cells are allocated
---
xen/arch/arm/domain_build.c | 327 +++++++++++++++++++++----------------------
1 file changed, 162 insertions(+), 165 deletions(-)
diff --git a/xen/arch/arm/domain_build.c b/xen/arch/arm/domain_build.c
index 8ebe1bc..fb4f172 100644
--- a/xen/arch/arm/domain_build.c
+++ b/xen/arch/arm/domain_build.c
@@ -63,10 +63,10 @@ struct vcpu *__init alloc_dom0_vcpu0(void)
}
static int set_memory_reg_11(struct domain *d, struct kernel_info *kinfo,
- const void *fdt, const u32 *cell, int len,
- int address_cells, int size_cells, u32 *new_cell)
+ const struct dt_property *pp,
+ const struct dt_device_node *np, __be32 *new_cell)
{
- int reg_size = (address_cells + size_cells) * sizeof(*cell);
+ int reg_size = dt_cells_to_size(dt_n_addr_cells(np) + dt_n_size_cells(np));
paddr_t start;
paddr_t size;
struct page_info *pg;
@@ -90,7 +90,7 @@ static int set_memory_reg_11(struct domain *d, struct kernel_info *kinfo,
if ( res )
panic("Unable to add pages in DOM0: %d\n", res);
- device_tree_set_reg(&new_cell, address_cells, size_cells, start, size);
+ dt_set_range(&new_cell, np, start, size);
kinfo->mem.bank[0].start = start;
kinfo->mem.bank[0].size = size;
@@ -100,25 +100,30 @@ static int set_memory_reg_11(struct domain *d, struct kernel_info *kinfo,
}
static int set_memory_reg(struct domain *d, struct kernel_info *kinfo,
- const void *fdt, const u32 *cell, int len,
- int address_cells, int size_cells, u32 *new_cell)
+ const struct dt_property *pp,
+ const struct dt_device_node *np, __be32 *new_cell)
{
- int reg_size = (address_cells + size_cells) * sizeof(*cell);
+ int reg_size = dt_cells_to_size(dt_n_addr_cells(np) + dt_n_size_cells(np));
int l = 0;
+ unsigned int bank = 0;
u64 start;
u64 size;
+ int ret;
if ( platform_has_quirk(PLATFORM_QUIRK_DOM0_MAPPING_11) )
- return set_memory_reg_11(d, kinfo, fdt, cell, len, address_cells,
- size_cells, new_cell);
+ return set_memory_reg_11(d, kinfo, pp, np, new_cell);
- while ( kinfo->unassigned_mem > 0 && l + reg_size <= len
+ while ( kinfo->unassigned_mem > 0 && l + reg_size <= pp->length
&& kinfo->mem.nr_banks < NR_MEM_BANKS )
{
- device_tree_get_reg(&cell, address_cells, size_cells, &start, &size);
+ ret = dt_device_get_address(np, bank, &start, &size);
+ if ( ret )
+ panic("Unable to retrieve the bank %u for %s\n",
+ bank, dt_node_full_name(np));
+
if ( size > kinfo->unassigned_mem )
size = kinfo->unassigned_mem;
- device_tree_set_reg(&new_cell, address_cells, size_cells, start, size);
+ dt_set_range(&new_cell, np, start, size);
printk("Populate P2M %#"PRIx64"->%#"PRIx64"\n", start, start + size);
if ( p2m_populate_ram(d, start, start + size) < 0 )
@@ -135,31 +140,21 @@ static int set_memory_reg(struct domain *d, struct kernel_info *kinfo,
}
static int write_properties(struct domain *d, struct kernel_info *kinfo,
- const void *fdt,
- int node, const char *name, int depth,
- u32 address_cells, u32 size_cells)
+ const struct dt_device_node *np)
{
const char *bootargs = NULL;
- int prop;
+ const struct dt_property *pp;
+ int res = 0;
if ( early_info.modules.nr_mods >= MOD_KERNEL &&
early_info.modules.module[MOD_KERNEL].cmdline[0] )
bootargs = &early_info.modules.module[MOD_KERNEL].cmdline[0];
- for ( prop = fdt_first_property_offset(fdt, node);
- prop >= 0;
- prop = fdt_next_property_offset(fdt, prop) )
+ dt_for_each_property_node (np, pp)
{
- const struct fdt_property *p;
- const char *prop_name;
- const char *prop_data;
- int prop_len;
- char *new_data = NULL;
-
- p = fdt_get_property_by_offset(fdt, prop, NULL);
- prop_name = fdt_string(fdt, fdt32_to_cpu(p->nameoff));
- prop_data = p->data;
- prop_len = fdt32_to_cpu(p->len);
+ const void *prop_data = pp->value;
+ void *new_data = NULL;
+ u32 prop_len = pp->length;
/*
* In chosen node:
@@ -168,105 +163,114 @@ static int write_properties(struct domain *d, struct kernel_info *kinfo,
* bootargs (from module #1, above).
* * remove bootargs and xen,dom0-bootargs.
*/
- if ( device_tree_node_matches(fdt, node, "chosen") )
+ if ( dt_node_path_is_equal(np, "/chosen") )
{
- if ( strcmp(prop_name, "bootargs") == 0 )
+ if ( dt_property_name_is_equal(pp, "bootargs") )
continue;
- else if ( strcmp(prop_name, "xen,dom0-bootargs") == 0 )
+ else if ( dt_property_name_is_equal(pp, "xen,dom0-bootargs") )
{
if ( !bootargs )
- bootargs = prop_data;
+ bootargs = pp->value;
continue;
}
}
/*
* In a memory node: adjust reg property.
+ * TODO: handle properly memory node (ie: device_type = "memory")
*/
- else if ( device_tree_node_matches(fdt, node, "memory") )
+ else if ( dt_node_name_is_equal(np, "memory") )
{
- if ( strcmp(prop_name, "reg") == 0 )
+ if ( dt_property_name_is_equal(pp, "reg") )
{
- new_data = xzalloc_bytes(prop_len);
+ new_data = xzalloc_bytes(pp->length);
if ( new_data == NULL )
return -FDT_ERR_XEN(ENOMEM);
- prop_len = set_memory_reg(d, kinfo, fdt,
- (u32 *)prop_data, prop_len,
- address_cells, size_cells,
- (u32 *)new_data);
+ prop_len = set_memory_reg(d, kinfo, pp, np,
+ (__be32 *)new_data);
prop_data = new_data;
}
}
- /*
- * TODO: Should call map_mmio_regions() for all devices in the
- * tree that have a "reg" parameter (except cpus). This
- * requires looking into the parent node's "ranges" property
- * to translate the bus address in the "reg" value into
- * physical addresses. Regions also need to be rounded up to
- * whole pages.
- */
-
- fdt_property(kinfo->fdt, prop_name, prop_data, prop_len);
+ res = fdt_property(kinfo->fdt, pp->name, prop_data, prop_len);
xfree(new_data);
+
+ if ( res )
+ return res;
}
- if ( device_tree_node_matches(fdt, node, "chosen") && bootargs )
- fdt_property(kinfo->fdt, "bootargs", bootargs, strlen(bootargs) + 1);
+ if ( dt_node_path_is_equal(np, "/chosen") && bootargs )
+ {
+ res = fdt_property(kinfo->fdt, "bootargs", bootargs,
+ strlen(bootargs) + 1);
+ if ( res )
+ return res;
+ }
/*
* XXX should populate /chosen/linux,initrd-{start,end} here if we
* have module[2]
*/
- if ( prop == -FDT_ERR_NOTFOUND )
- return 0;
- return prop;
+ return 0;
}
-/* Returns the next node in fdt (starting from offset) which should be
- * passed through to dom0.
+/*
+ * Helper to write an interrupts with the GIC format
+ * This code is assuming the irq is an PPI.
*/
-static int fdt_next_dom0_node(const void *fdt, int node,
- int *depth_out)
+
+typedef __be32 gic_interrupt_t[3];
+
+static void set_interrupt_ppi(gic_interrupt_t interrupt, unsigned int irq,
+ unsigned int cpumask, unsigned int level)
{
- int depth = *depth_out;
+ __be32 *cells = interrupt;
- while ( (node = fdt_next_node(fdt, node, &depth)) &&
- node >= 0 && depth >= 0 )
- {
- if ( depth >= DEVICE_TREE_MAX_DEPTH )
- break;
+ BUG_ON(irq < 16 && irq >= 32);
- /* Skip /hypervisor/ node. We will inject our own. */
- if ( fdt_node_check_compatible(fdt, node, "xen,xen" ) == 0 )
- {
- printk("Device-tree contains \"xen,xen\" node. Ignoring.\n");
- continue;
- }
+ /* See linux Documentation/devictree/bindings/arm/gic.txt */
+ dt_set_cell(&cells, 1, 1); /* is a PPI */
+ dt_set_cell(&cells, 1, irq - 16); /* PPIs start at 16 */
+ dt_set_cell(&cells, 1, (cpumask << 8) | level);
+}
- /* Skip multiboot subnodes */
- if ( fdt_node_check_compatible(fdt, node,
- "xen,multiboot-module" ) == 0 )
- continue;
+/*
+ * Helper to set interrupts for a node in the flat device tree.
+ * It needs 2 property:
+ * "interrupts": contains the list of interrupts
+ * "interrupt-parent": link to the GIC
+ */
+static int fdt_property_interrupts(void *fdt, gic_interrupt_t *intr,
+ unsigned num_irq)
+{
+ int res;
- /* We've arrived at a node which dom0 is interested in. */
- break;
- }
+ res = fdt_property(fdt, "interrupts", intr, sizeof (intr[0]) * num_irq);
+ if ( res )
+ return res;
+
+ res = fdt_property_cell(fdt, "interrupt-parent",
+ dt_interrupt_controller->phandle);
- *depth_out = depth;
- return node;
+ return res;
}
-static void make_hypervisor_node(void *fdt, int addrcells, int sizecells)
+
+static int make_hypervisor_node(void *fdt, const struct dt_device_node *parent)
{
const char compat[] =
"xen,xen-"__stringify(XEN_VERSION)"."__stringify(XEN_SUBVERSION)"\0"
"xen,xen";
- u32 reg[4];
- u32 intr[3];
- u32 *cell;
+ __be32 reg[4];
+ gic_interrupt_t intr;
+ __be32 *cells;
+ int res;
+ int addrcells = dt_n_addr_cells(parent);
+ int sizecells = dt_n_size_cells(parent);
+
+ DPRINT("Create hypervisor node\n");
/*
* Sanity-check address sizes, since addresses and sizes which do
@@ -277,82 +281,42 @@ static void make_hypervisor_node(void *fdt, int addrcells, int sizecells)
panic("Cannot cope with this size");
/* See linux Documentation/devicetree/bindings/arm/xen.txt */
- fdt_begin_node(fdt, "hypervisor");
+ res = fdt_begin_node(fdt, "hypervisor");
+ if ( res )
+ return res;
/* Cannot use fdt_property_string due to embedded nulls */
- fdt_property(fdt, "compatible", compat, sizeof(compat));
+ res = fdt_property(fdt, "compatible", compat, sizeof(compat));
+ if ( res )
+ return res;
+ DPRINT(" Grant table range: 0xb0000000-0x20000\n");
/* reg 0 is grant table space */
- cell = ®[0];
- device_tree_set_reg(&cell, addrcells, sizecells, 0xb0000000, 0x20000);
- fdt_property(fdt, "reg", reg,
- sizeof(reg[0]) * (addrcells + sizecells));
+ cells = ®[0];
+ dt_set_range(&cells, parent, 0xb0000000, 0x20000);
+ res = fdt_property(fdt, "reg", reg,
+ dt_cells_to_size(addrcells + sizecells));
+ if ( res )
+ return res;
/*
- * interrupts is evtchn upcall <1 15 0xf08>
- * See linux Documentation/devicetree/bindings/arm/gic.txt
+ * interrupts is evtchn upcall:
+ * - Active-low level-sensitive
+ * - All cpus
+ *
+ * TODO: Handle correctly the cpumask
*/
- intr[0] = cpu_to_fdt32(1); /* is a PPI */
- intr[1] = cpu_to_fdt32(VGIC_IRQ_EVTCHN_CALLBACK - 16); /* PPIs start at 16 */
- intr[2] = cpu_to_fdt32(0xf08); /* Active-low level-sensitive */
-
- fdt_property(fdt, "interrupts", intr, sizeof(intr[0]) * 3);
+ DPRINT(" Event channel interrupt to %u\n", VGIC_IRQ_EVTCHN_CALLBACK);
+ set_interrupt_ppi(intr, VGIC_IRQ_EVTCHN_CALLBACK, 0xf,
+ DT_IRQ_TYPE_LEVEL_LOW);
- fdt_end_node(fdt);
-}
-
-static int write_nodes(struct domain *d, struct kernel_info *kinfo,
- const void *fdt)
-{
- int node;
- int depth = 0, last_depth = -1;
- u32 address_cells[DEVICE_TREE_MAX_DEPTH];
- u32 size_cells[DEVICE_TREE_MAX_DEPTH];
- int ret;
-
- for ( node = 0, depth = 0;
- node >= 0 && depth >= 0;
- node = fdt_next_dom0_node(fdt, node, &depth) )
- {
- const char *name;
-
- name = fdt_get_name(fdt, node, NULL);
-
- if ( depth >= DEVICE_TREE_MAX_DEPTH )
- {
- printk("warning: node `%s' is nested too deep (%d)\n",
- name, depth);
- continue;
- }
-
- /* We cannot handle descending more than one level at a time */
- ASSERT( depth <= last_depth + 1 );
-
- while ( last_depth-- >= depth )
- fdt_end_node(kinfo->fdt);
-
- address_cells[depth] = device_tree_get_u32(fdt, node, "#address-cells",
- depth > 0 ? address_cells[depth-1] : 0);
- size_cells[depth] = device_tree_get_u32(fdt, node, "#size-cells",
- depth > 0 ? size_cells[depth-1] : 0);
-
- fdt_begin_node(kinfo->fdt, name);
-
- ret = write_properties(d, kinfo, fdt, node, name, depth,
- address_cells[depth-1], size_cells[depth-1]);
- if ( ret < 0 )
- return ret;
-
- last_depth = depth;
- }
-
- while ( last_depth-- >= 1 )
- fdt_end_node(kinfo->fdt);
+ res = fdt_property_interrupts(fdt, &intr, 1);
+ if ( res )
+ return res;
- make_hypervisor_node(kinfo->fdt, address_cells[0], size_cells[0]);
+ res = fdt_end_node(fdt);
- fdt_end_node(kinfo->fdt);
- return 0;
+ return res;
}
/* Map the device in the domain */
@@ -435,25 +399,39 @@ static int map_device(struct domain *d, const struct dt_device_node *dev)
return 0;
}
-static int handle_node(struct domain *d, const struct dt_device_node *np)
+static int handle_node(struct domain *d, struct kernel_info *kinfo,
+ const struct dt_device_node *np)
{
static const struct dt_device_match skip_matches[] __initconst =
{
DT_MATCH_COMPATIBLE("xen,xen"),
- DT_MATCH_TYPE("memory"),
- DT_MATCH_PATH("/chosen"),
+ DT_MATCH_COMPATIBLE("xen,multiboot-module"),
{ /* sentinel */ },
};
const struct dt_device_node *child;
int res;
+ const char *name;
+ const char *path;
+
+ path = dt_node_full_name(np);
- DPRINT("handle %s\n", dt_node_full_name(np));
+ DPRINT("handle %s\n", path);
/* Skip theses nodes and the sub-nodes */
if ( dt_match_node(skip_matches, np ) )
+ {
+ DPRINT(" Skip it!\n");
return 0;
+ }
- if ( dt_device_used_by(np) != DOMID_XEN )
+ /*
+ * Some device doesn't need to be mapped in Xen:
+ * - Device used by Xen: Obviously dom0 can't use them
+ * - Memory: the guest will see a different view of memory. It will
+ * be allocated later.
+ */
+ if ( dt_device_used_by(np) != DOMID_XEN &&
+ !dt_device_type_is_equal(np, "memory") )
{
res = map_device(d, np);
@@ -461,21 +439,39 @@ static int handle_node(struct domain *d, const struct dt_device_node *np)
return res;
}
+ /*
+ * The property "name" is used to have a different name on older FDT
+ * version. We want to keep the name retrieved during the tree
+ * structure creation, that is store in the node path.
+ */
+ name = strrchr(path, '/');
+ name = name ? name + 1 : path;
+
+ res = fdt_begin_node(kinfo->fdt, name);
+ if ( res )
+ return res;
+
+ res = write_properties(d, kinfo, np);
+ if ( res )
+ return res;
+
for ( child = np->child; child != NULL; child = child->sibling )
{
- res = handle_node(d, child);
+ res = handle_node(d, kinfo, child);
if ( res )
return res;
}
- return 0;
-}
+ if ( np == dt_host )
+ {
+ res = make_hypervisor_node(kinfo->fdt, np);
+ if ( res )
+ return res;
+ }
-static int map_devices_from_device_tree(struct domain *d)
-{
- ASSERT(dt_host && (dt_host->sibling == NULL));
+ res = fdt_end_node(kinfo->fdt);
- return handle_node(d, dt_host);
+ return res;
}
static int prepare_dtb(struct domain *d, struct kernel_info *kinfo)
@@ -485,6 +481,8 @@ static int prepare_dtb(struct domain *d, struct kernel_info *kinfo)
int ret;
paddr_t end;
+ ASSERT(dt_host && (dt_host->sibling == NULL));
+
kinfo->unassigned_mem = dom0_mem;
fdt = device_tree_flattened;
@@ -500,8 +498,8 @@ static int prepare_dtb(struct domain *d, struct kernel_info *kinfo)
fdt_finish_reservemap(kinfo->fdt);
- ret = write_nodes(d, kinfo, fdt);
- if ( ret < 0 )
+ ret = handle_node(d, kinfo, dt_host);
+ if ( ret )
goto err;
ret = fdt_finish(kinfo->fdt);
@@ -576,7 +574,6 @@ int construct_dom0(struct domain *d)
if ( rc < 0 )
return rc;
- map_devices_from_device_tree(d);
rc = platform_specific_mapping(d);
if ( rc < 0 )
return rc;
--
1.7.10.4
^ permalink raw reply related [flat|nested] 29+ messages in thread* [PATCH v4 14/27] xen/arm: Don't map disabled device in DOM0
2013-09-13 12:49 [PATCH v4 00/27] Allow Xen to boot with a raw device tree Julien Grall
` (12 preceding siblings ...)
2013-09-13 12:49 ` [PATCH v4 13/27] xen/arm: Build DOM0 FDT by browsing the device tree structure Julien Grall
@ 2013-09-13 12:49 ` Julien Grall
2013-09-13 12:49 ` [PATCH v4 15/27] xen/arm: Create a fake PSCI node in dom0 device tree Julien Grall
` (13 subsequent siblings)
27 siblings, 0 replies; 29+ messages in thread
From: Julien Grall @ 2013-09-13 12:49 UTC (permalink / raw)
To: xen-devel
Cc: patches, Julien Grall, ian.campbell, andre.przywara,
stefano.stabellini
Linux should cope with 'status = "disabled"' in the Device Tree.
Signed-off-by: Julien Grall <julien.grall@linaro.org>
---
Changes in v3:
- Remove the sentence about pass-through in the commit message
Changes in v2:
- Add a comment
---
xen/arch/arm/domain_build.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/xen/arch/arm/domain_build.c b/xen/arch/arm/domain_build.c
index fb4f172..70f48b6 100644
--- a/xen/arch/arm/domain_build.c
+++ b/xen/arch/arm/domain_build.c
@@ -429,9 +429,13 @@ static int handle_node(struct domain *d, struct kernel_info *kinfo,
* - Device used by Xen: Obviously dom0 can't use them
* - Memory: the guest will see a different view of memory. It will
* be allocated later.
+ * - Disabled device: Linux is able to cope with status="disabled"
+ * property. Therefore these device doesn't need to be mapped. This
+ * solution can be use later for pass through.
*/
if ( dt_device_used_by(np) != DOMID_XEN &&
- !dt_device_type_is_equal(np, "memory") )
+ !dt_device_type_is_equal(np, "memory") &&
+ dt_device_is_available(np) )
{
res = map_device(d, np);
--
1.7.10.4
^ permalink raw reply related [flat|nested] 29+ messages in thread* [PATCH v4 15/27] xen/arm: Create a fake PSCI node in dom0 device tree
2013-09-13 12:49 [PATCH v4 00/27] Allow Xen to boot with a raw device tree Julien Grall
` (13 preceding siblings ...)
2013-09-13 12:49 ` [PATCH v4 14/27] xen/arm: Don't map disabled device in DOM0 Julien Grall
@ 2013-09-13 12:49 ` Julien Grall
2013-09-13 12:49 ` [PATCH v4 16/27] xen/arm: Create a fake cpus " Julien Grall
` (12 subsequent siblings)
27 siblings, 0 replies; 29+ messages in thread
From: Julien Grall @ 2013-09-13 12:49 UTC (permalink / raw)
To: xen-devel
Cc: patches, Julien Grall, ian.campbell, andre.przywara,
stefano.stabellini
Xen uses PSCI to bring up secondary cpus for the guest.
Signed-off-by: Julien Grall <julien.grall@linaro.org>
---
Changes in v2:
- Use fdt_property_cell
---
xen/arch/arm/domain_build.c | 38 ++++++++++++++++++++++++++++++++++++++
1 file changed, 38 insertions(+)
diff --git a/xen/arch/arm/domain_build.c b/xen/arch/arm/domain_build.c
index 70f48b6..e1333a4 100644
--- a/xen/arch/arm/domain_build.c
+++ b/xen/arch/arm/domain_build.c
@@ -13,6 +13,7 @@
#include <xen/guest_access.h>
#include <asm/setup.h>
#include <asm/platform.h>
+#include <asm/psci.h>
#include <asm/gic.h>
#include <xen/irq.h>
@@ -319,6 +320,38 @@ static int make_hypervisor_node(void *fdt, const struct dt_device_node *parent)
return res;
}
+static int make_psci_node(void *fdt, const struct dt_device_node *parent)
+{
+ int res;
+
+ DPRINT("Create PSCI node\n");
+
+ /* See linux Documentation/devicetree/bindings/arm/psci.txt */
+ res = fdt_begin_node(fdt, "psci");
+ if ( res )
+ return res;
+
+ res = fdt_property_string(fdt, "compatible", "arm,psci");
+ if ( res )
+ return res;
+
+ res = fdt_property_string(fdt, "method", "hvc");
+ if ( res )
+ return res;
+
+ res = fdt_property_cell(fdt, "cpu_off", __PSCI_cpu_off);
+ if ( res )
+ return res;
+
+ res = fdt_property_cell(fdt, "cpu_on", __PSCI_cpu_on);
+ if ( res )
+ return res;
+
+ res = fdt_end_node(fdt);
+
+ return res;
+}
+
/* Map the device in the domain */
static int map_device(struct domain *d, const struct dt_device_node *dev)
{
@@ -406,6 +439,7 @@ static int handle_node(struct domain *d, struct kernel_info *kinfo,
{
DT_MATCH_COMPATIBLE("xen,xen"),
DT_MATCH_COMPATIBLE("xen,multiboot-module"),
+ DT_MATCH_COMPATIBLE("arm,psci"),
{ /* sentinel */ },
};
const struct dt_device_node *child;
@@ -471,6 +505,10 @@ static int handle_node(struct domain *d, struct kernel_info *kinfo,
res = make_hypervisor_node(kinfo->fdt, np);
if ( res )
return res;
+
+ res = make_psci_node(kinfo->fdt, np);
+ if ( res )
+ return res;
}
res = fdt_end_node(kinfo->fdt);
--
1.7.10.4
^ permalink raw reply related [flat|nested] 29+ messages in thread* [PATCH v4 16/27] xen/arm: Create a fake cpus node in dom0 device tree
2013-09-13 12:49 [PATCH v4 00/27] Allow Xen to boot with a raw device tree Julien Grall
` (14 preceding siblings ...)
2013-09-13 12:49 ` [PATCH v4 15/27] xen/arm: Create a fake PSCI node in dom0 device tree Julien Grall
@ 2013-09-13 12:49 ` Julien Grall
2013-09-13 12:49 ` [PATCH v4 17/27] xen/arm: Create a fake GIC " Julien Grall
` (11 subsequent siblings)
27 siblings, 0 replies; 29+ messages in thread
From: Julien Grall @ 2013-09-13 12:49 UTC (permalink / raw)
To: xen-devel
Cc: patches, Julien Grall, ian.campbell, andre.przywara,
stefano.stabellini
The number of cpus in dom0 can be different compare to the real number of
physical cpus.
For the moment, Xen assumes that the cpus are identical.
Signed-off-by: Julien Grall <julien.grall@linaro.org>
Acked-by: Ian Campbell <ian.campbell@citrix.com>
---
Changes in v3:
- for_each_child was renamed to dt_for_each_child
- improve comment in the code
---
xen/arch/arm/domain_build.c | 92 +++++++++++++++++++++++++++++++++++++++++++
1 file changed, 92 insertions(+)
diff --git a/xen/arch/arm/domain_build.c b/xen/arch/arm/domain_build.c
index e1333a4..036155e 100644
--- a/xen/arch/arm/domain_build.c
+++ b/xen/arch/arm/domain_build.c
@@ -352,6 +352,93 @@ static int make_psci_node(void *fdt, const struct dt_device_node *parent)
return res;
}
+static int make_cpus_node(const struct domain *d, void *fdt,
+ const struct dt_device_node *parent)
+{
+ int res;
+ const struct dt_device_node *cpus = dt_find_node_by_path("/cpus");
+ const struct dt_device_node *npcpu;
+ unsigned int cpu;
+ const void *compatible = NULL;
+ u32 len;
+ /* Placeholder for cpu@ + a 32-bit number + \0 */
+ char buf[15];
+
+ DPRINT("Create cpus node\n");
+
+ if ( !cpus )
+ {
+ dprintk(XENLOG_ERR, "Missing /cpus node in the device tree?\n");
+ return -ENOENT;
+ }
+
+ /*
+ * Get the compatible property of CPUs from the device tree.
+ * We are assuming that all CPUs are the same so we are just look
+ * for the first one.
+ * TODO: Handle compatible per VCPU
+ */
+ dt_for_each_child_node(cpus, npcpu)
+ {
+ if ( dt_device_type_is_equal(npcpu, "cpu") )
+ {
+ compatible = dt_get_property(npcpu, "compatible", &len);
+ break;
+ }
+ }
+
+ if ( !compatible )
+ {
+ dprintk(XENLOG_ERR, "Can't find cpu in the device tree?\n");
+ return -ENOENT;
+ }
+
+ /* See Linux Documentation/devicetree/booting-without-of.txt
+ * section III.5.b
+ */
+ res = fdt_begin_node(fdt, "cpus");
+ if ( res )
+ return res;
+
+ res = fdt_property_cell(fdt, "#address-cells", 1);
+ if ( res )
+ return res;
+
+ res = fdt_property_cell(fdt, "#size-cells", 0);
+ if ( res )
+ return res;
+
+ for ( cpu = 0; cpu < d->max_vcpus; cpu++ )
+ {
+ DPRINT("Create cpu@%u node\n", cpu);
+
+ snprintf(buf, sizeof(buf), "cpu@%u", cpu);
+ res = fdt_begin_node(fdt, buf);
+ if ( res )
+ return res;
+
+ res = fdt_property(fdt, "compatible", compatible, len);
+ if ( res )
+ return res;
+
+ res = fdt_property_string(fdt, "device_type", "cpu");
+ if ( res )
+ return res;
+
+ res = fdt_property_cell(fdt, "reg", cpu);
+ if ( res )
+ return res;
+
+ res = fdt_end_node(fdt);
+ if ( res )
+ return res;
+ }
+
+ res = fdt_end_node(fdt);
+
+ return res;
+}
+
/* Map the device in the domain */
static int map_device(struct domain *d, const struct dt_device_node *dev)
{
@@ -440,6 +527,7 @@ static int handle_node(struct domain *d, struct kernel_info *kinfo,
DT_MATCH_COMPATIBLE("xen,xen"),
DT_MATCH_COMPATIBLE("xen,multiboot-module"),
DT_MATCH_COMPATIBLE("arm,psci"),
+ DT_MATCH_PATH("/cpus"),
{ /* sentinel */ },
};
const struct dt_device_node *child;
@@ -509,6 +597,10 @@ static int handle_node(struct domain *d, struct kernel_info *kinfo,
res = make_psci_node(kinfo->fdt, np);
if ( res )
return res;
+
+ res = make_cpus_node(d, kinfo->fdt, np);
+ if ( res )
+ return res;
}
res = fdt_end_node(kinfo->fdt);
--
1.7.10.4
^ permalink raw reply related [flat|nested] 29+ messages in thread* [PATCH v4 17/27] xen/arm: Create a fake GIC node in dom0 device tree
2013-09-13 12:49 [PATCH v4 00/27] Allow Xen to boot with a raw device tree Julien Grall
` (15 preceding siblings ...)
2013-09-13 12:49 ` [PATCH v4 16/27] xen/arm: Create a fake cpus " Julien Grall
@ 2013-09-13 12:49 ` Julien Grall
2013-09-13 12:49 ` [PATCH v4 18/27] xen/arm: Create a fake timer " Julien Grall
` (10 subsequent siblings)
27 siblings, 0 replies; 29+ messages in thread
From: Julien Grall @ 2013-09-13 12:49 UTC (permalink / raw)
To: xen-devel
Cc: patches, Julien Grall, ian.campbell, andre.przywara,
stefano.stabellini
Recreate the GIC node and remove hypervisor specific ranges (vgic and hypervisor
controls).
Signed-off-by: Julien Grall <julien.grall@linaro.org>
---
Changes in v3:
- Use DT_MATCH_GIC
---
xen/arch/arm/domain_build.c | 78 +++++++++++++++++++++++++++++++++++++++++++
1 file changed, 78 insertions(+)
diff --git a/xen/arch/arm/domain_build.c b/xen/arch/arm/domain_build.c
index 036155e..87382d5 100644
--- a/xen/arch/arm/domain_build.c
+++ b/xen/arch/arm/domain_build.c
@@ -439,6 +439,79 @@ static int make_cpus_node(const struct domain *d, void *fdt,
return res;
}
+static int make_gic_node(const struct domain *d, void *fdt,
+ const struct dt_device_node *parent)
+{
+ const struct dt_device_node *gic = dt_interrupt_controller;
+ const void *compatible = NULL;
+ u32 len;
+ __be32 *new_cells, *tmp;
+ int res = 0;
+
+ DPRINT("Create gic node\n");
+
+ compatible = dt_get_property(gic, "compatible", &len);
+ if ( !compatible )
+ {
+ dprintk(XENLOG_ERR, "Can't find compatible property for the gic node\n");
+ return -FDT_ERR_XEN(ENOENT);
+ }
+
+ res = fdt_begin_node(fdt, "interrupt-controller");
+ if ( res )
+ return res;
+
+ res = fdt_property(fdt, "compatible", compatible, len);
+ if ( res )
+ return res;
+
+ res = fdt_property_cell(fdt, "#interrupt-cells", 3);
+ if ( res )
+ return res;
+
+ res = fdt_property(fdt, "interrupt-controller", NULL, 0);
+
+ if ( res )
+ return res;
+
+ len = dt_cells_to_size(dt_n_addr_cells(parent) + dt_n_size_cells(parent));
+ len *= 2;
+ new_cells = xzalloc_bytes(dt_cells_to_size(len));
+ if ( new_cells == NULL )
+ return -FDT_ERR_XEN(ENOMEM);
+
+ tmp = new_cells;
+ DPRINT(" Set Distributor Base 0x%"PRIpaddr"-0x%"PRIpaddr"\n",
+ d->arch.vgic.dbase, d->arch.vgic.dbase + PAGE_SIZE - 1);
+ dt_set_range(&tmp, parent, d->arch.vgic.dbase, PAGE_SIZE);
+
+ DPRINT(" Set Cpu Base 0x%"PRIpaddr" size = 0x%"PRIpaddr"\n",
+ d->arch.vgic.cbase, d->arch.vgic.cbase + (PAGE_SIZE * 2) - 1);
+ dt_set_range(&tmp, parent, d->arch.vgic.cbase, PAGE_SIZE * 2);
+
+ res = fdt_property(fdt, "reg", new_cells, len);
+ xfree(new_cells);
+
+ if ( res )
+ return res;
+
+ /*
+ * The value of the property "phandle" in the property "interrupts"
+ * to know on which interrupt controller the interrupt is wired.
+ */
+ if ( gic->phandle )
+ {
+ DPRINT(" Set phandle = 0x%x\n", gic->phandle);
+ res = fdt_property_cell(fdt, "phandle", gic->phandle);
+ if ( res )
+ return res;
+ }
+
+ res = fdt_end_node(fdt);
+
+ return res;
+}
+
/* Map the device in the domain */
static int map_device(struct domain *d, const struct dt_device_node *dev)
{
@@ -528,6 +601,7 @@ static int handle_node(struct domain *d, struct kernel_info *kinfo,
DT_MATCH_COMPATIBLE("xen,multiboot-module"),
DT_MATCH_COMPATIBLE("arm,psci"),
DT_MATCH_PATH("/cpus"),
+ DT_MATCH_GIC,
{ /* sentinel */ },
};
const struct dt_device_node *child;
@@ -601,6 +675,10 @@ static int handle_node(struct domain *d, struct kernel_info *kinfo,
res = make_cpus_node(d, kinfo->fdt, np);
if ( res )
return res;
+
+ res = make_gic_node(d, kinfo->fdt, np);
+ if ( res )
+ return res;
}
res = fdt_end_node(kinfo->fdt);
--
1.7.10.4
^ permalink raw reply related [flat|nested] 29+ messages in thread* [PATCH v4 18/27] xen/arm: Create a fake timer node in dom0 device tree
2013-09-13 12:49 [PATCH v4 00/27] Allow Xen to boot with a raw device tree Julien Grall
` (16 preceding siblings ...)
2013-09-13 12:49 ` [PATCH v4 17/27] xen/arm: Create a fake GIC " Julien Grall
@ 2013-09-13 12:49 ` Julien Grall
2013-09-13 12:49 ` [PATCH v4 19/27] xen/arm: Add new platform specific callback device_is_blacklist Julien Grall
` (9 subsequent siblings)
27 siblings, 0 replies; 29+ messages in thread
From: Julien Grall @ 2013-09-13 12:49 UTC (permalink / raw)
To: xen-devel
Cc: patches, Julien Grall, ian.campbell, andre.przywara,
stefano.stabellini
Recreate the timer node and remove hypervisor specific interrupt.
Signed-off-by: Julien Grall <julien.grall@linaro.org>
---
Changes in v4:
- Replace interrupt_t and set_interrupts respectively by
gic_interrupt_t and set_interrupt_ppi
- Use fdt_property_interrupts
Changes in v3:
- Use DT_MATCH_TIMER
---
xen/arch/arm/domain_build.c | 66 +++++++++++++++++++++++++++++++++++++++++++
1 file changed, 66 insertions(+)
diff --git a/xen/arch/arm/domain_build.c b/xen/arch/arm/domain_build.c
index 87382d5..cda1e13 100644
--- a/xen/arch/arm/domain_build.c
+++ b/xen/arch/arm/domain_build.c
@@ -512,6 +512,67 @@ static int make_gic_node(const struct domain *d, void *fdt,
return res;
}
+static int make_timer_node(const struct domain *d, void *fdt,
+ const struct dt_device_node *parent)
+{
+ static const struct dt_device_match timer_ids[] __initconst =
+ {
+ DT_MATCH_COMPATIBLE("arm,armv7-timer"),
+ DT_MATCH_COMPATIBLE("arm,armv8-timer"),
+ { /* sentinel */ },
+ };
+ struct dt_device_node *dev;
+ u32 len;
+ const void *compatible;
+ int res;
+ const struct dt_irq *irq;
+ gic_interrupt_t intrs[3];
+
+ DPRINT("Create timer node\n");
+
+ dev = dt_find_matching_node(NULL, timer_ids);
+ if ( !dev )
+ {
+ dprintk(XENLOG_ERR, "Missing timer node in the device tree?\n");
+ return -FDT_ERR_XEN(ENOENT);
+ }
+
+ compatible = dt_get_property(dev, "compatible", &len);
+ if ( !compatible )
+ {
+ dprintk(XENLOG_ERR, "Can't find compatible property for timer node\n");
+ return -FDT_ERR_XEN(ENOENT);
+ }
+
+ res = fdt_begin_node(fdt, "timer");
+ if ( res )
+ return res;
+
+ res = fdt_property(fdt, "compatible", compatible, len);
+ if ( res )
+ return res;
+
+ irq = timer_dt_irq(TIMER_PHYS_SECURE_PPI);
+ DPRINT(" Secure interrupt %u\n", irq->irq);
+ set_interrupt_ppi(intrs[0], irq->irq, 0xf, irq->type);
+
+ irq = timer_dt_irq(TIMER_PHYS_NONSECURE_PPI);
+ DPRINT(" Non secure interrupt %u\n", irq->irq);
+ set_interrupt_ppi(intrs[1], irq->irq, 0xf, irq->type);
+
+ irq = timer_dt_irq(TIMER_VIRT_PPI);
+ DPRINT(" Virt interrupt %u\n", irq->irq);
+ set_interrupt_ppi(intrs[2], irq->irq, 0xf, irq->type);
+
+ res = fdt_property_interrupts(fdt, intrs, 3);
+ if ( res )
+ return res;
+
+ res = fdt_end_node(fdt);
+
+ return res;
+}
+
/* Map the device in the domain */
static int map_device(struct domain *d, const struct dt_device_node *dev)
{
@@ -602,6 +663,7 @@ static int handle_node(struct domain *d, struct kernel_info *kinfo,
DT_MATCH_COMPATIBLE("arm,psci"),
DT_MATCH_PATH("/cpus"),
DT_MATCH_GIC,
+ DT_MATCH_TIMER,
{ /* sentinel */ },
};
const struct dt_device_node *child;
@@ -679,6 +741,10 @@ static int handle_node(struct domain *d, struct kernel_info *kinfo,
res = make_gic_node(d, kinfo->fdt, np);
if ( res )
return res;
+
+ res = make_timer_node(d, kinfo->fdt, np);
+ if ( res )
+ return res;
}
res = fdt_end_node(kinfo->fdt);
--
1.7.10.4
^ permalink raw reply related [flat|nested] 29+ messages in thread* [PATCH v4 19/27] xen/arm: Add new platform specific callback device_is_blacklist
2013-09-13 12:49 [PATCH v4 00/27] Allow Xen to boot with a raw device tree Julien Grall
` (17 preceding siblings ...)
2013-09-13 12:49 ` [PATCH v4 18/27] xen/arm: Create a fake timer " Julien Grall
@ 2013-09-13 12:49 ` Julien Grall
2013-09-13 12:49 ` [PATCH v4 20/27] xen/arm: Remove devices used by Xen from dom0 device tree Julien Grall
` (8 subsequent siblings)
27 siblings, 0 replies; 29+ messages in thread
From: Julien Grall @ 2013-09-13 12:49 UTC (permalink / raw)
To: xen-devel
Cc: patches, Julien Grall, ian.campbell, andre.przywara,
stefano.stabellini
Each platform code will list the device that must not pass-through to a guest.
Theses devices are used for: power management, timer,...
When theses devices are given to DOM0, it can controls the hardware and then
break the whole platform.
This callback is enough until we will start to care about power performance.
For this purpose, we may need to extend this interface to implement per-device
MMIO filtering to allow dom0 to continue to control devices which it owns which
happen to share e.g. a clock controller with Xen.
Signed-off-by: Julien Grall <julien.grall@linaro.org>
Acked-by: Ian Campbell <ian.campbell@citrix.com>
---
Changes in v3:
- Rename platform_device_is_blacklist to platform_device_is_blacklisted
Changes in v2:
- Update commit message
---
xen/arch/arm/domain_build.c | 3 ++-
xen/arch/arm/platform.c | 10 ++++++++++
xen/include/asm-arm/platform.h | 7 +++++++
3 files changed, 19 insertions(+), 1 deletion(-)
diff --git a/xen/arch/arm/domain_build.c b/xen/arch/arm/domain_build.c
index cda1e13..300a64d 100644
--- a/xen/arch/arm/domain_build.c
+++ b/xen/arch/arm/domain_build.c
@@ -676,7 +676,8 @@ static int handle_node(struct domain *d, struct kernel_info *kinfo,
DPRINT("handle %s\n", path);
/* Skip theses nodes and the sub-nodes */
- if ( dt_match_node(skip_matches, np ) )
+ if ( dt_match_node(skip_matches, np ) ||
+ platform_device_is_blacklisted(np) )
{
DPRINT(" Skip it!\n");
return 0;
diff --git a/xen/arch/arm/platform.c b/xen/arch/arm/platform.c
index afda302..db79368 100644
--- a/xen/arch/arm/platform.c
+++ b/xen/arch/arm/platform.c
@@ -127,6 +127,16 @@ bool_t platform_has_quirk(uint32_t quirk)
return !!(quirks & quirk);
}
+bool_t platform_device_is_blacklisted(const struct dt_device_node *node)
+{
+ const struct dt_device_match *blacklist = NULL;
+
+ if ( platform && platform->blacklist_dev )
+ blacklist = platform->blacklist_dev;
+
+ return dt_match_node(blacklist, node);
+}
+
/*
* Local variables:
* mode: C
diff --git a/xen/include/asm-arm/platform.h b/xen/include/asm-arm/platform.h
index f460e9c..a19dbf7 100644
--- a/xen/include/asm-arm/platform.h
+++ b/xen/include/asm-arm/platform.h
@@ -4,6 +4,7 @@
#include <xen/init.h>
#include <xen/sched.h>
#include <xen/mm.h>
+#include <xen/device_tree.h>
/* Describe specific operation for a board */
struct platform_desc {
@@ -26,6 +27,11 @@ struct platform_desc {
* board with different quirk on each
*/
uint32_t (*quirks)(void);
+ /*
+ * Platform blacklist devices
+ * List of devices which must not pass-through to a guest
+ */
+ const struct dt_device_match *blacklist_dev;
};
/*
@@ -40,6 +46,7 @@ int __init platform_specific_mapping(struct domain *d);
void platform_reset(void);
void platform_poweroff(void);
bool_t platform_has_quirk(uint32_t quirk);
+bool_t platform_device_is_blacklisted(const struct dt_device_node *node);
#define PLATFORM_START(_name, _namestr) \
static const struct platform_desc __plat_desc_##_name __used \
--
1.7.10.4
^ permalink raw reply related [flat|nested] 29+ messages in thread* [PATCH v4 20/27] xen/arm: Remove devices used by Xen from dom0 device tree
2013-09-13 12:49 [PATCH v4 00/27] Allow Xen to boot with a raw device tree Julien Grall
` (18 preceding siblings ...)
2013-09-13 12:49 ` [PATCH v4 19/27] xen/arm: Add new platform specific callback device_is_blacklist Julien Grall
@ 2013-09-13 12:49 ` Julien Grall
2013-09-13 12:49 ` [PATCH v4 21/27] xen/arm: vexpress: Blacklist a list of board specific devices Julien Grall
` (7 subsequent siblings)
27 siblings, 0 replies; 29+ messages in thread
From: Julien Grall @ 2013-09-13 12:49 UTC (permalink / raw)
To: xen-devel
Cc: patches, Julien Grall, ian.campbell, andre.przywara,
stefano.stabellini
Devices used by Xen should not be pass-through to dom0. If the device is really
usefull for dom0 (for instance the timer and the GIC), it will recreate the
node.
Signed-off-by: Julien Grall <julien.grall@linaro.org>
---
xen/arch/arm/domain_build.c | 7 +++----
1 file changed, 3 insertions(+), 4 deletions(-)
diff --git a/xen/arch/arm/domain_build.c b/xen/arch/arm/domain_build.c
index 300a64d..82003c1 100644
--- a/xen/arch/arm/domain_build.c
+++ b/xen/arch/arm/domain_build.c
@@ -677,7 +677,8 @@ static int handle_node(struct domain *d, struct kernel_info *kinfo,
/* Skip theses nodes and the sub-nodes */
if ( dt_match_node(skip_matches, np ) ||
- platform_device_is_blacklisted(np) )
+ platform_device_is_blacklisted(np) ||
+ dt_device_used_by(np) == DOMID_XEN )
{
DPRINT(" Skip it!\n");
return 0;
@@ -685,15 +686,13 @@ static int handle_node(struct domain *d, struct kernel_info *kinfo,
/*
* Some device doesn't need to be mapped in Xen:
- * - Device used by Xen: Obviously dom0 can't use them
* - Memory: the guest will see a different view of memory. It will
* be allocated later.
* - Disabled device: Linux is able to cope with status="disabled"
* property. Therefore these device doesn't need to be mapped. This
* solution can be use later for pass through.
*/
- if ( dt_device_used_by(np) != DOMID_XEN &&
- !dt_device_type_is_equal(np, "memory") &&
+ if ( !dt_device_type_is_equal(np, "memory") &&
dt_device_is_available(np) )
{
res = map_device(d, np);
--
1.7.10.4
^ permalink raw reply related [flat|nested] 29+ messages in thread* [PATCH v4 21/27] xen/arm: vexpress: Blacklist a list of board specific devices
2013-09-13 12:49 [PATCH v4 00/27] Allow Xen to boot with a raw device tree Julien Grall
` (19 preceding siblings ...)
2013-09-13 12:49 ` [PATCH v4 20/27] xen/arm: Remove devices used by Xen from dom0 device tree Julien Grall
@ 2013-09-13 12:49 ` Julien Grall
2013-09-13 12:49 ` [PATCH v4 22/27] xen/arm: exynos5: Blacklist MCT device Julien Grall
` (6 subsequent siblings)
27 siblings, 0 replies; 29+ messages in thread
From: Julien Grall @ 2013-09-13 12:49 UTC (permalink / raw)
To: xen-devel
Cc: patches, Julien Grall, ian.campbell, andre.przywara,
stefano.stabellini
On Versatile there are a bunch of devices which must not be pass-through to any
guest (power management and cache coherency devices).
This commit also blacklists the HDLCD device because Xen is unable to correctly
map the framebuffer into dom0. Therefore, when Linux will try to access to the
framebuffer, Xen will receive a non-handled data access.
Signed-off-by: Julien Grall <julien.grall@linaro.org>
---
Changes in v3:
- Fix typoes in commit message
Changes in v2:
- Fix typoes in commit message
---
xen/arch/arm/platforms/vexpress.c | 17 +++++++++++++++++
1 file changed, 17 insertions(+)
diff --git a/xen/arch/arm/platforms/vexpress.c b/xen/arch/arm/platforms/vexpress.c
index 6f7dc2c..298c141 100644
--- a/xen/arch/arm/platforms/vexpress.c
+++ b/xen/arch/arm/platforms/vexpress.c
@@ -125,9 +125,26 @@ static const char * const vexpress_dt_compat[] __initdata =
NULL
};
+static const struct dt_device_match vexpress_blacklist_dev[] __initconst =
+{
+ /* Cache Coherent Interconnect */
+ DT_MATCH_COMPATIBLE("arm,cci-400"),
+ DT_MATCH_COMPATIBLE("arm,cci-400-pmu"),
+ /* Video device
+ * TODO: remove it once memreserve is handled properly by Xen
+ */
+ DT_MATCH_COMPATIBLE("arm,hdlcd"),
+ /* Hardware power management */
+ DT_MATCH_COMPATIBLE("arm,vexpress-reset"),
+ DT_MATCH_COMPATIBLE("arm,vexpress-reboot"),
+ DT_MATCH_COMPATIBLE("arm,vexpress-shutdown"),
+ { /* sentinel */ },
+};
+
PLATFORM_START(vexpress, "VERSATILE EXPRESS")
.compatible = vexpress_dt_compat,
.reset = vexpress_reset,
+ .blacklist_dev = vexpress_blacklist_dev,
PLATFORM_END
/*
--
1.7.10.4
^ permalink raw reply related [flat|nested] 29+ messages in thread* [PATCH v4 22/27] xen/arm: exynos5: Blacklist MCT device
2013-09-13 12:49 [PATCH v4 00/27] Allow Xen to boot with a raw device tree Julien Grall
` (20 preceding siblings ...)
2013-09-13 12:49 ` [PATCH v4 21/27] xen/arm: vexpress: Blacklist a list of board specific devices Julien Grall
@ 2013-09-13 12:49 ` Julien Grall
2013-09-13 12:49 ` [PATCH v4 23/27] xen/dts: Clean up the exported API for device tree Julien Grall
` (5 subsequent siblings)
27 siblings, 0 replies; 29+ messages in thread
From: Julien Grall @ 2013-09-13 12:49 UTC (permalink / raw)
To: xen-devel
Cc: patches, Julien Grall, ian.campbell, andre.przywara,
stefano.stabellini
The Multi Core Timer (MCT) is a Samsung specific device.
This device tries to route IRQ in non-boot CPU which is not yet handled by Xen.
The user will see randomly dom0 hang, but I'm not sure that is the real reason.
Signed-off-by: Julien Grall <julien.grall@linaro.org>
Acked-by: Ian Campbell <ian.campbell@citrix.com>
---
xen/arch/arm/platforms/exynos5.c | 11 +++++++++++
1 file changed, 11 insertions(+)
diff --git a/xen/arch/arm/platforms/exynos5.c b/xen/arch/arm/platforms/exynos5.c
index 262ded8..d9eedc8 100644
--- a/xen/arch/arm/platforms/exynos5.c
+++ b/xen/arch/arm/platforms/exynos5.c
@@ -92,12 +92,23 @@ static const char * const exynos5_dt_compat[] __initdata =
NULL
};
+static const struct dt_device_match exynos5_blacklist_dev[] __initconst =
+{
+ /* Multi core Timer
+ * TODO: this device set up IRQ to CPU 1 which is not yet handled by Xen.
+ * This is result to random freeze.
+ */
+ DT_MATCH_COMPATIBLE("samsung,exynos4210-mct"),
+ { /* sentinel */ },
+};
+
PLATFORM_START(exynos5, "SAMSUNG EXYNOS5")
.compatible = exynos5_dt_compat,
.init_time = exynos5_init_time,
.specific_mapping = exynos5_specific_mapping,
.reset = exynos5_reset,
.quirks = exynos5_quirks,
+ .blacklist_dev = exynos5_blacklist_dev,
PLATFORM_END
/*
--
1.7.10.4
^ permalink raw reply related [flat|nested] 29+ messages in thread* [PATCH v4 23/27] xen/dts: Clean up the exported API for device tree
2013-09-13 12:49 [PATCH v4 00/27] Allow Xen to boot with a raw device tree Julien Grall
` (21 preceding siblings ...)
2013-09-13 12:49 ` [PATCH v4 22/27] xen/arm: exynos5: Blacklist MCT device Julien Grall
@ 2013-09-13 12:49 ` Julien Grall
2013-09-13 12:49 ` [PATCH v4 24/27] xen/dts: device_get_reg: cells are 32-bit big endian value Julien Grall
` (4 subsequent siblings)
27 siblings, 0 replies; 29+ messages in thread
From: Julien Grall @ 2013-09-13 12:49 UTC (permalink / raw)
To: xen-devel
Cc: patches, Julien Grall, ian.campbell, andre.przywara,
stefano.stabellini
All Xen code has been converted to the new device tree API that uses a tree
structure to describe the DTS.
The Flat Device tree is still used by Xen during early boot stage, but only in
internal. Remove entirely unneeded functions or move to a static function.
Signed-off-by: Julien Grall <julien.grall@linaro.org>
Acked-by: Ian Campbell <ian.campbell@citrix.com>
---
Changes in v2:
- Don't remove device_tree_get_reg and don't export it
---
xen/common/device_tree.c | 92 +++++++----------------------------------
xen/include/xen/device_tree.h | 15 -------
2 files changed, 14 insertions(+), 93 deletions(-)
diff --git a/xen/common/device_tree.c b/xen/common/device_tree.c
index 215592e..8e6d8c1 100644
--- a/xen/common/device_tree.c
+++ b/xen/common/device_tree.c
@@ -103,8 +103,8 @@ struct dt_bus
unsigned int (*get_flags)(const __be32 *addr);
};
-bool_t __init device_tree_node_matches(const void *fdt, int node,
- const char *match)
+static bool_t __init device_tree_node_matches(const void *fdt, int node,
+ const char *match)
{
const char *name;
size_t match_len;
@@ -118,7 +118,7 @@ bool_t __init device_tree_node_matches(const void *fdt, int node,
&& (name[match_len] == '@' || name[match_len] == '\0');
}
-bool_t __init device_tree_type_matches(const void *fdt, int node,
+static bool_t __init device_tree_type_matches(const void *fdt, int node,
const char *match)
{
const void *prop;
@@ -130,8 +130,8 @@ bool_t __init device_tree_type_matches(const void *fdt, int node,
return !dt_node_cmp(prop, match);
}
-bool_t __init device_tree_node_compatible(const void *fdt, int node,
- const char *match)
+static bool_t __init device_tree_node_compatible(const void *fdt, int node,
+ const char *match)
{
int len, l;
int mlen;
@@ -154,13 +154,6 @@ bool_t __init device_tree_node_compatible(const void *fdt, int node,
return 0;
}
-static __init int device_tree_nr_reg_ranges(const struct fdt_property *prop,
- u32 address_cells, u32 size_cells)
-{
- u32 reg_cells = address_cells + size_cells;
- return fdt32_to_cpu(prop->len) / (reg_cells * sizeof(u32));
-}
-
static void __init get_val(const u32 **cell, u32 cells, u64 *val)
{
*val = 0;
@@ -175,8 +168,8 @@ static void __init get_val(const u32 **cell, u32 cells, u64 *val)
}
}
-void __init device_tree_get_reg(const u32 **cell, u32 address_cells,
- u32 size_cells, u64 *start, u64 *size)
+static void __init device_tree_get_reg(const u32 **cell, u32 address_cells,
+ u32 size_cells, u64 *start, u64 *size)
{
get_val(cell, address_cells, start);
get_val(cell, size_cells, size);
@@ -202,13 +195,6 @@ void dt_set_cell(__be32 **cellp, int size, u64 val)
(*cellp) += cells;
}
-void __init device_tree_set_reg(u32 **cell, u32 address_cells, u32 size_cells,
- u64 start, u64 size)
-{
- dt_set_cell(cell, address_cells, start);
- dt_set_cell(cell, size_cells, size);
-}
-
void dt_set_range(__be32 **cellp, const struct dt_device_node *np,
u64 address, u64 size)
{
@@ -216,8 +202,8 @@ void dt_set_range(__be32 **cellp, const struct dt_device_node *np,
dt_set_cell(cellp, dt_n_size_cells(np), size);
}
-u32 __init device_tree_get_u32(const void *fdt, int node, const char *prop_name,
- u32 dflt)
+static u32 __init device_tree_get_u32(const void *fdt, int node,
+ const char *prop_name, u32 dflt)
{
const struct fdt_property *prop;
@@ -239,8 +225,9 @@ u32 __init device_tree_get_u32(const void *fdt, int node, const char *prop_name,
* Returns 0 if all nodes were iterated over successfully. If @func
* returns a value different from 0, that value is returned immediately.
*/
-int __init device_tree_for_each_node(const void *fdt,
- device_tree_node_func func, void *data)
+static int __init device_tree_for_each_node(const void *fdt,
+ device_tree_node_func func,
+ void *data)
{
int node;
int depth;
@@ -275,58 +262,6 @@ int __init device_tree_for_each_node(const void *fdt,
return 0;
}
-struct find_compat {
- const char *compatible;
- int found;
- int node;
- int depth;
- u32 address_cells;
- u32 size_cells;
-};
-
-static int _find_compatible_node(const void *fdt,
- int node, const char *name, int depth,
- u32 address_cells, u32 size_cells,
- void *data)
-{
- struct find_compat *c = (struct find_compat *) data;
-
- if ( c->found )
- return 1;
-
- if ( device_tree_node_compatible(fdt, node, c->compatible) )
- {
- c->found = 1;
- c->node = node;
- c->depth = depth;
- c->address_cells = address_cells;
- c->size_cells = size_cells;
- return 1;
- }
- return 0;
-}
-
-int __init find_compatible_node(const char *compatible, int *node, int *depth,
- u32 *address_cells, u32 *size_cells)
-{
- int ret;
- struct find_compat c;
- c.compatible = compatible;
- c.found = 0;
-
- ret = device_tree_for_each_node(device_tree_flattened, _find_compatible_node, &c);
- if ( !c.found )
- return ret;
- else
- {
- *node = c.node;
- *depth = c.depth;
- *address_cells = c.address_cells;
- *size_cells = c.size_cells;
- return 1;
- }
-}
-
/**
* device_tree_bootargs - return the bootargs (the Xen command line)
* @fdt flat device tree.
@@ -394,6 +329,7 @@ static void __init process_memory_node(const void *fdt, int node,
int banks;
const u32 *cell;
paddr_t start, size;
+ u32 reg_cells = address_cells + size_cells;
if ( address_cells < 1 || size_cells < 1 )
{
@@ -410,7 +346,7 @@ static void __init process_memory_node(const void *fdt, int node,
}
cell = (const u32 *)prop->data;
- banks = device_tree_nr_reg_ranges(prop, address_cells, size_cells);
+ banks = fdt32_to_cpu(prop->len) / (reg_cells * sizeof (u32));
for ( i = 0; i < banks && early_info.mem.nr_banks < NR_MEM_BANKS; i++ )
{
diff --git a/xen/include/xen/device_tree.h b/xen/include/xen/device_tree.h
index fae9f97..7810f53 100644
--- a/xen/include/xen/device_tree.h
+++ b/xen/include/xen/device_tree.h
@@ -181,21 +181,6 @@ extern const void *device_tree_flattened;
size_t __init device_tree_early_init(const void *fdt);
-void __init device_tree_get_reg(const u32 **cell, u32 address_cells,
- u32 size_cells,
- u64 *start, u64 *size);
-void __init device_tree_set_reg(u32 **cell, u32 address_cells, u32 size_cells,
- u64 start, u64 size);
-u32 __init device_tree_get_u32(const void *fdt, int node,
- const char *prop_name, u32 dflt);
-bool_t __init device_tree_node_matches(const void *fdt, int node,
- const char *match);
-bool_t __init device_tree_node_compatible(const void *fdt, int node,
- const char *match);
-int __init find_compatible_node(const char *compatible, int *node, int *depth,
- u32 *address_cells, u32 *size_cells);
-int __init device_tree_for_each_node(const void *fdt,
- device_tree_node_func func, void *data);
const char __init *device_tree_bootargs(const void *fdt);
void __init device_tree_dump(const void *fdt);
--
1.7.10.4
^ permalink raw reply related [flat|nested] 29+ messages in thread* [PATCH v4 24/27] xen/dts: device_get_reg: cells are 32-bit big endian value
2013-09-13 12:49 [PATCH v4 00/27] Allow Xen to boot with a raw device tree Julien Grall
` (22 preceding siblings ...)
2013-09-13 12:49 ` [PATCH v4 23/27] xen/dts: Clean up the exported API for device tree Julien Grall
@ 2013-09-13 12:49 ` Julien Grall
2013-09-13 12:49 ` [PATCH v4 25/27] xen/dts: replace get_val by dt_next_cell Julien Grall
` (3 subsequent siblings)
27 siblings, 0 replies; 29+ messages in thread
From: Julien Grall @ 2013-09-13 12:49 UTC (permalink / raw)
To: xen-devel
Cc: patches, Julien Grall, ian.campbell, andre.przywara,
stefano.stabellini
Device tree cells are 32-bit big endian value. Use __be32 to avoid confusion
later.
Signed-off-by: Julien Grall <julien.grall@linaro.org>
Acked-by: Ian Campbell <ian.campbell@citrix.com>
---
Changes in v3:
- Divide the patch in 2 parts. Move in another patch
s/get_val/dt_next_cell/
---
xen/common/device_tree.c | 12 ++++++------
1 file changed, 6 insertions(+), 6 deletions(-)
diff --git a/xen/common/device_tree.c b/xen/common/device_tree.c
index 8e6d8c1..eac507d 100644
--- a/xen/common/device_tree.c
+++ b/xen/common/device_tree.c
@@ -154,7 +154,7 @@ static bool_t __init device_tree_node_compatible(const void *fdt, int node,
return 0;
}
-static void __init get_val(const u32 **cell, u32 cells, u64 *val)
+static void __init get_val(const __be32 **cell, u32 cells, u64 *val)
{
*val = 0;
@@ -168,7 +168,7 @@ static void __init get_val(const u32 **cell, u32 cells, u64 *val)
}
}
-static void __init device_tree_get_reg(const u32 **cell, u32 address_cells,
+static void __init device_tree_get_reg(const __be32 **cell, u32 address_cells,
u32 size_cells, u64 *start, u64 *size)
{
get_val(cell, address_cells, start);
@@ -327,7 +327,7 @@ static void __init process_memory_node(const void *fdt, int node,
const struct fdt_property *prop;
int i;
int banks;
- const u32 *cell;
+ const __be32 *cell;
paddr_t start, size;
u32 reg_cells = address_cells + size_cells;
@@ -345,7 +345,7 @@ static void __init process_memory_node(const void *fdt, int node,
return;
}
- cell = (const u32 *)prop->data;
+ cell = (const __be32 *)prop->data;
banks = fdt32_to_cpu(prop->len) / (reg_cells * sizeof (u32));
for ( i = 0; i < banks && early_info.mem.nr_banks < NR_MEM_BANKS; i++ )
@@ -396,7 +396,7 @@ static void __init process_multiboot_node(const void *fdt, int node,
u32 address_cells, u32 size_cells)
{
const struct fdt_property *prop;
- const u32 *cell;
+ const __be32 *cell;
int nr;
struct dt_mb_module *mod;
int len;
@@ -418,7 +418,7 @@ static void __init process_multiboot_node(const void *fdt, int node,
early_panic("fdt: node `%s': `reg` property length is too short\n",
name);
- cell = (const u32 *)prop->data;
+ cell = (const __be32 *)prop->data;
device_tree_get_reg(&cell, address_cells, size_cells,
&mod->start, &mod->size);
--
1.7.10.4
^ permalink raw reply related [flat|nested] 29+ messages in thread* [PATCH v4 25/27] xen/dts: replace get_val by dt_next_cell
2013-09-13 12:49 [PATCH v4 00/27] Allow Xen to boot with a raw device tree Julien Grall
` (23 preceding siblings ...)
2013-09-13 12:49 ` [PATCH v4 24/27] xen/dts: device_get_reg: cells are 32-bit big endian value Julien Grall
@ 2013-09-13 12:49 ` Julien Grall
2013-09-13 12:49 ` [PATCH v4 26/27] xen/arm: Check if the device is available before using it Julien Grall
` (2 subsequent siblings)
27 siblings, 0 replies; 29+ messages in thread
From: Julien Grall @ 2013-09-13 12:49 UTC (permalink / raw)
To: xen-devel
Cc: patches, Julien Grall, ian.campbell, andre.przywara,
stefano.stabellini
Signed-off-by: Julien Grall <julien.grall@linaro.org>
Acked-by: Ian Campbell <ian.campbell@citrix.com>
---
xen/common/device_tree.c | 18 ++----------------
1 file changed, 2 insertions(+), 16 deletions(-)
diff --git a/xen/common/device_tree.c b/xen/common/device_tree.c
index eac507d..ee58c52 100644
--- a/xen/common/device_tree.c
+++ b/xen/common/device_tree.c
@@ -154,25 +154,11 @@ static bool_t __init device_tree_node_compatible(const void *fdt, int node,
return 0;
}
-static void __init get_val(const __be32 **cell, u32 cells, u64 *val)
-{
- *val = 0;
-
- if ( cells > 2 )
- early_panic("dtb value contains > 2 cells\n");
-
- while ( cells-- )
- {
- *val <<= 32;
- *val |= fdt32_to_cpu(*(*cell)++);
- }
-}
-
static void __init device_tree_get_reg(const __be32 **cell, u32 address_cells,
u32 size_cells, u64 *start, u64 *size)
{
- get_val(cell, address_cells, start);
- get_val(cell, size_cells, size);
+ *start = dt_next_cell(address_cells, cell);
+ *size = dt_next_cell(size_cells, cell);
}
void dt_get_range(const __be32 **cell, const struct dt_device_node *np,
--
1.7.10.4
^ permalink raw reply related [flat|nested] 29+ messages in thread* [PATCH v4 26/27] xen/arm: Check if the device is available before using it
2013-09-13 12:49 [PATCH v4 00/27] Allow Xen to boot with a raw device tree Julien Grall
` (24 preceding siblings ...)
2013-09-13 12:49 ` [PATCH v4 25/27] xen/dts: replace get_val by dt_next_cell Julien Grall
@ 2013-09-13 12:49 ` Julien Grall
2013-09-13 12:49 ` [PATCH v4 27/27] ARM: parse separate DT properties for different commandlines Julien Grall
2013-09-17 14:43 ` [PATCH v4 00/27] Allow Xen to boot with a raw device tree Ian Campbell
27 siblings, 0 replies; 29+ messages in thread
From: Julien Grall @ 2013-09-13 12:49 UTC (permalink / raw)
To: xen-devel
Cc: patches, Julien Grall, ian.campbell, andre.przywara,
stefano.stabellini
It's possible to have a device description in the DTS but the device is not
wired.
device_init must check if the device is available before doing anything with
it.
Signed-off-by: Julien Grall <julien.grall@linaro.org>
Acked-by: Ian Campbell <ian.campbell@citrix.com>
---
xen/arch/arm/device.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/xen/arch/arm/device.c b/xen/arch/arm/device.c
index dc751a9..f86b2e3 100644
--- a/xen/arch/arm/device.c
+++ b/xen/arch/arm/device.c
@@ -47,6 +47,9 @@ int __init device_init(struct dt_device_node *dev, enum device_type type,
ASSERT(dev != NULL);
+ if ( !dt_device_is_available(dev) )
+ return -ENODEV;
+
for ( desc = _sdevice; desc != _edevice; desc++ )
{
if ( desc->type != type )
--
1.7.10.4
^ permalink raw reply related [flat|nested] 29+ messages in thread* [PATCH v4 27/27] ARM: parse separate DT properties for different commandlines
2013-09-13 12:49 [PATCH v4 00/27] Allow Xen to boot with a raw device tree Julien Grall
` (25 preceding siblings ...)
2013-09-13 12:49 ` [PATCH v4 26/27] xen/arm: Check if the device is available before using it Julien Grall
@ 2013-09-13 12:49 ` Julien Grall
2013-09-17 14:43 ` [PATCH v4 00/27] Allow Xen to boot with a raw device tree Ian Campbell
27 siblings, 0 replies; 29+ messages in thread
From: Julien Grall @ 2013-09-13 12:49 UTC (permalink / raw)
To: xen-devel
Cc: patches, Julien Grall, ian.campbell, andre.przywara,
stefano.stabellini
From: Andre Przywara <andre.przywara@linaro.org>
Currently we use the chosen/bootargs property as the Xen commandline
and rely on xen,dom0-bootargs for Dom0. However this brings issues
with bootloaders, which usually build bootargs by bootscripts for a
Linux kernel - and not for the entirely different Xen hypervisor.
Introduce a new possible device tree property "xen,xen-bootargs"
explicitly for the Xen hypervisor and make the selection of which to
use more fine grained:
- If xen,xen-bootargs is present, it will be used for Xen.
- If xen,dom0-bootargs is present, it will be used for Dom0.
- If xen,xen-bootargs is _not_ present, but xen,dom0-bootargs is,
bootargs will be used for Xen. Like the current situation.
- If no Xen specific properties are present, bootargs is for Dom0.
- If xen,xen-bootargs is present, but xen,dom0-bootargs is missing,
bootargs will be used for Dom0.
The aim is to allow common bootscripts to boot both Xen and native
Linux with the same device tree blob. If needed, one could hard-code
the Xen commandline into the DTB, leaving bootargs for Dom0 to be set
by the (non Xen-aware) bootloader.
I will send out a appropriate u-boot patch, which writes the content
of the "xen_bootargs" environment variable into the xen,xen-bootargs
dtb property.
Signed-off-by: Andre Przywara <andre.przywara@linaro.org>
Signed-off-by: Julien Grall <julien.grall@linaro.org>
Acked-by: Ian Campbell <ian.campbell@citrix.com>
---
Changes in v2:
- Add and rebase this patch to this patch series
Changes before the patch was added to this patch series:
v1 .. v2:
- fix whitespace issues
v2 .. v3:
- add documentation
---
docs/misc/arm/device-tree/booting.txt | 28 +++++++++++++++++++++++++++-
xen/arch/arm/domain_build.c | 15 +++++++++++----
xen/common/device_tree.c | 7 ++++++-
3 files changed, 44 insertions(+), 6 deletions(-)
diff --git a/docs/misc/arm/device-tree/booting.txt b/docs/misc/arm/device-tree/booting.txt
index 94cd3f1..08ed775 100644
--- a/docs/misc/arm/device-tree/booting.txt
+++ b/docs/misc/arm/device-tree/booting.txt
@@ -1,3 +1,6 @@
+Dom0 kernel and ramdisk modules
+================================
+
Xen is passed the dom0 kernel and initrd via a reference in the /chosen
node of the device tree.
@@ -22,4 +25,27 @@ properties:
- bootargs (optional)
- Command line associated with this module
+ Command line associated with this module. This is deprecated and should
+ be replaced by the bootargs variations described below.
+
+
+Command lines
+=============
+
+Xen also checks for properties directly under /chosen to find suitable command
+lines for Xen and Dom0. The logic is the following:
+
+ - If xen,xen-bootargs is present, it will be used for Xen.
+ - If xen,dom0-bootargs is present, it will be used for Dom0.
+ - If xen,xen-bootargs is _not_ present, but xen,dom0-bootargs is,
+ bootargs will be used for Xen.
+ - If no Xen specific properties are present, bootargs is for Dom0.
+ - If xen,xen-bootargs is present, but xen,dom0-bootargs is missing,
+ bootargs will be used for Dom0.
+
+Most of these cases is to make booting with Xen-unaware bootloaders easier.
+For those you would hardcode the Xen commandline in the DTB under
+/chosen/xen,xen-bootargs and would let the bootloader set the Dom0 command
+line by writing bootargs (as for native Linux).
+A Xen-aware bootloader would set xen,xen-bootargs for Xen, xen,dom0-bootargs
+for Dom0 and bootargs for native Linux.
diff --git a/xen/arch/arm/domain_build.c b/xen/arch/arm/domain_build.c
index 82003c1..40af876 100644
--- a/xen/arch/arm/domain_build.c
+++ b/xen/arch/arm/domain_build.c
@@ -146,6 +146,7 @@ static int write_properties(struct domain *d, struct kernel_info *kinfo,
const char *bootargs = NULL;
const struct dt_property *pp;
int res = 0;
+ int had_dom0_bootargs = 0;
if ( early_info.modules.nr_mods >= MOD_KERNEL &&
early_info.modules.module[MOD_KERNEL].cmdline[0] )
@@ -162,15 +163,21 @@ static int write_properties(struct domain *d, struct kernel_info *kinfo,
*
* * remember xen,dom0-bootargs if we don't already have
* bootargs (from module #1, above).
- * * remove bootargs and xen,dom0-bootargs.
+ * * remove bootargs, xen,dom0-bootargs and xen,xen-bootargs.
*/
if ( dt_node_path_is_equal(np, "/chosen") )
{
- if ( dt_property_name_is_equal(pp, "bootargs") )
+ if ( dt_property_name_is_equal(pp, "xen,xen-bootargs") )
+ continue;
+ if ( dt_property_name_is_equal(pp, "xen,dom0-bootargs") )
+ {
+ had_dom0_bootargs = 1;
+ bootargs = pp->value;
continue;
- else if ( dt_property_name_is_equal(pp, "xen,dom0-bootargs") )
+ }
+ if ( dt_property_name_is_equal(pp, "bootargs") )
{
- if ( !bootargs )
+ if ( !bootargs && !had_dom0_bootargs )
bootargs = pp->value;
continue;
}
diff --git a/xen/common/device_tree.c b/xen/common/device_tree.c
index ee58c52..0ece249 100644
--- a/xen/common/device_tree.c
+++ b/xen/common/device_tree.c
@@ -261,7 +261,12 @@ const char *device_tree_bootargs(const void *fdt)
if ( node < 0 )
return NULL;
- prop = fdt_get_property(fdt, node, "bootargs", NULL);
+ prop = fdt_get_property(fdt, node, "xen,xen-bootargs", NULL);
+ if ( prop == NULL )
+ {
+ if (fdt_get_property(fdt, node, "xen,dom0-bootargs", NULL))
+ prop = fdt_get_property(fdt, node, "bootargs", NULL);
+ }
if ( prop == NULL )
return NULL;
--
1.7.10.4
^ permalink raw reply related [flat|nested] 29+ messages in thread* Re: [PATCH v4 00/27] Allow Xen to boot with a raw device tree
2013-09-13 12:49 [PATCH v4 00/27] Allow Xen to boot with a raw device tree Julien Grall
` (26 preceding siblings ...)
2013-09-13 12:49 ` [PATCH v4 27/27] ARM: parse separate DT properties for different commandlines Julien Grall
@ 2013-09-17 14:43 ` Ian Campbell
27 siblings, 0 replies; 29+ messages in thread
From: Ian Campbell @ 2013-09-17 14:43 UTC (permalink / raw)
To: Julien Grall; +Cc: stefano.stabellini, andre.przywara, patches, xen-devel
On Fri, 2013-09-13 at 13:49 +0100, Julien Grall wrote:
> Hi,
>
> This is the fourth version of this patch series. It allows Xen to boot with
> a raw device tree, ie without any specific modification for Xen.
I acked + applied the whole thing, thanks.
^ permalink raw reply [flat|nested] 29+ messages in thread