[Qemu-devel] [PATCH v4 0/3] ARM virt: Silence dtc warnings

[Qemu-devel] [PATCH v4 0/3] ARM virt: Silence dtc warnings

[Eric Auger]

When running dtc on the guest /proc/device-tree, we get the
following warnings: "Warning (unit_address_vs_reg): Node <name>
has a reg or ranges property, but no unit name", with name:
/intc, /intc/its, /intc/v2m, /memory.

This series removes those warnings by adding the unit address to
the corresponding node names.

This is based on Peter's target-arm.next

Best Regards

Eric

History:
v3 -> v4:
- rebased on Peter's target-arm.next

v2 -> v3:
- only nop root /memory and /memory@unit-address nodes
- remove a deprecated comment

v1 -> v2:
- nop existing node-name and node-name@unit-address nodes and
  add our owns.
- added 1st patch device_tree: Add qemu_fdt_node_unit_path

Eric Auger (3):
  device_tree: Add qemu_fdt_node_unit_path
  hw/arm/virt: Silence dtc /intc warnings
  hw/arm/virt: Silence dtc /memory warning

 device_tree.c                | 55 ++++++++++++++++++++++++++++++++++
 hw/arm/boot.c                | 41 ++++++++++++++------------
 hw/arm/virt.c                | 70 +++++++++++++++++++++++++-------------------
 include/sysemu/device_tree.h | 16 ++++++++++
 4 files changed, 134 insertions(+), 48 deletions(-)

-- 
2.5.5

[Qemu-devel] [PATCH v4 1/3] device_tree: Add qemu_fdt_node_unit_path

[Eric Auger]

This helper allows to retrieve the paths of nodes whose name
match node-name or node-name@unit-address patterns.

Signed-off-by: Eric Auger <eric.auger@redhat.com>
---
 device_tree.c                | 55 ++++++++++++++++++++++++++++++++++++++++++++
 include/sysemu/device_tree.h | 16 +++++++++++++
 2 files changed, 71 insertions(+)

diff --git a/device_tree.c b/device_tree.c
index 52c3358..b5873f3 100644
--- a/device_tree.c
+++ b/device_tree.c
@@ -229,6 +229,61 @@ static int findnode_nofail(void *fdt, const char *node_path)
     return offset;
 }
 
+char **qemu_fdt_node_unit_path(void *fdt, const char *name, Error **errp)
+{
+    char *prefix =  g_strdup_printf("%s@", name);
+    unsigned int path_len = 16, n = 0;
+    GSList *path_list = NULL, *iter;
+    const char *iter_name;
+    int offset, len, ret;
+    char **path_array;
+
+    offset = fdt_next_node(fdt, -1, NULL);
+
+    while (offset >= 0) {
+        iter_name = fdt_get_name(fdt, offset, &len);
+        if (!iter_name) {
+            offset = len;
+            break;
+        }
+        if (!strcmp(iter_name, name) || g_str_has_prefix(iter_name, prefix)) {
+            char *path;
+
+            path = g_malloc(path_len);
+            while ((ret = fdt_get_path(fdt, offset, path, path_len))
+                  == -FDT_ERR_NOSPACE) {
+                path_len += 16;
+                path = g_realloc(path, path_len);
+            }
+            path_list = g_slist_prepend(path_list, path);
+            n++;
+        }
+        offset = fdt_next_node(fdt, offset, NULL);
+    }
+    g_free(prefix);
+
+    if (offset < 0 && offset != -FDT_ERR_NOTFOUND) {
+        error_setg(errp, "%s: abort parsing dt for %s node units: %s",
+                   __func__, name, fdt_strerror(offset));
+        for (iter = path_list; iter; iter = iter->next) {
+            g_free(iter->data);
+        }
+        g_slist_free(path_list);
+        return NULL;
+    }
+
+    path_array = g_new(char *, n + 1);
+    path_array[n--] = NULL;
+
+    for (iter = path_list; iter; iter = iter->next) {
+        path_array[n--] = iter->data;
+    }
+
+    g_slist_free(path_list);
+
+    return path_array;
+}
+
 char **qemu_fdt_node_path(void *fdt, const char *name, char *compat,
                           Error **errp)
 {
diff --git a/include/sysemu/device_tree.h b/include/sysemu/device_tree.h
index e22e5be..c16fd69 100644
--- a/include/sysemu/device_tree.h
+++ b/include/sysemu/device_tree.h
@@ -43,6 +43,22 @@ void *load_device_tree_from_sysfs(void);
 char **qemu_fdt_node_path(void *fdt, const char *name, char *compat,
                           Error **errp);
 
+/**
+ * qemu_fdt_node_unit_path: return the paths of nodes matching a given
+ * node-name, ie. node-name and node-name@unit-address
+ * @fdt: pointer to the dt blob
+ * @name: node name
+ * @errp: handle to an error object
+ *
+ * returns a newly allocated NULL-terminated array of node paths.
+ * Use g_strfreev() to free it. If one or more nodes were found, the
+ * array contains the path of each node and the last element equals to
+ * NULL. If there is no error but no matching node was found, the
+ * returned array contains a single element equal to NULL. If an error
+ * was encountered when parsing the blob, the function returns NULL
+ */
+char **qemu_fdt_node_unit_path(void *fdt, const char *name, Error **errp);
+
 int qemu_fdt_setprop(void *fdt, const char *node_path,
                      const char *property, const void *val, int size);
 int qemu_fdt_setprop_cell(void *fdt, const char *node_path,
-- 
2.5.5

[Qemu-devel] [PATCH v4 2/3] hw/arm/virt: Silence dtc /intc warnings

[Eric Auger]

When running dtc on the guest /proc/device-tree we get the
following warnings: "Warning (unit_address_vs_reg): Node <name>
has a reg or ranges property, but no unit name", with name:
/intc, /intc/its, /intc/v2m.

Nodes should have a name in the form <name>[@<unit-address>] where
unit-address is the primary address used to access the device, listed
in the node's reg property. This fix seems to make dtc happy.

Signed-off-by: Eric Auger <eric.auger@redhat.com>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
---
 hw/arm/virt.c | 63 ++++++++++++++++++++++++++++++++++++-----------------------
 1 file changed, 39 insertions(+), 24 deletions(-)

diff --git a/hw/arm/virt.c b/hw/arm/virt.c
index 742f68a..6cce282 100644
--- a/hw/arm/virt.c
+++ b/hw/arm/virt.c
@@ -369,58 +369,72 @@ static void fdt_add_cpu_nodes(const VirtMachineState *vms)
 
 static void fdt_add_its_gic_node(VirtMachineState *vms)
 {
+    char *nodename;
+
     vms->msi_phandle = qemu_fdt_alloc_phandle(vms->fdt);
-    qemu_fdt_add_subnode(vms->fdt, "/intc/its");
-    qemu_fdt_setprop_string(vms->fdt, "/intc/its", "compatible",
+    nodename = g_strdup_printf("/intc/its@%" PRIx64,
+                               vms->memmap[VIRT_GIC_ITS].base);
+    qemu_fdt_add_subnode(vms->fdt, nodename);
+    qemu_fdt_setprop_string(vms->fdt, nodename, "compatible",
                             "arm,gic-v3-its");
-    qemu_fdt_setprop(vms->fdt, "/intc/its", "msi-controller", NULL, 0);
-    qemu_fdt_setprop_sized_cells(vms->fdt, "/intc/its", "reg",
+    qemu_fdt_setprop(vms->fdt, nodename, "msi-controller", NULL, 0);
+    qemu_fdt_setprop_sized_cells(vms->fdt, nodename, "reg",
                                  2, vms->memmap[VIRT_GIC_ITS].base,
                                  2, vms->memmap[VIRT_GIC_ITS].size);
-    qemu_fdt_setprop_cell(vms->fdt, "/intc/its", "phandle", vms->msi_phandle);
+    qemu_fdt_setprop_cell(vms->fdt, nodename, "phandle", vms->msi_phandle);
+    g_free(nodename);
 }
 
 static void fdt_add_v2m_gic_node(VirtMachineState *vms)
 {
+    char *nodename;
+
+    nodename = g_strdup_printf("/intc/v2m@%" PRIx64,
+                               vms->memmap[VIRT_GIC_V2M].base);
     vms->msi_phandle = qemu_fdt_alloc_phandle(vms->fdt);
-    qemu_fdt_add_subnode(vms->fdt, "/intc/v2m");
-    qemu_fdt_setprop_string(vms->fdt, "/intc/v2m", "compatible",
+    qemu_fdt_add_subnode(vms->fdt, nodename);
+    qemu_fdt_setprop_string(vms->fdt, nodename, "compatible",
                             "arm,gic-v2m-frame");
-    qemu_fdt_setprop(vms->fdt, "/intc/v2m", "msi-controller", NULL, 0);
-    qemu_fdt_setprop_sized_cells(vms->fdt, "/intc/v2m", "reg",
+    qemu_fdt_setprop(vms->fdt, nodename, "msi-controller", NULL, 0);
+    qemu_fdt_setprop_sized_cells(vms->fdt, nodename, "reg",
                                  2, vms->memmap[VIRT_GIC_V2M].base,
                                  2, vms->memmap[VIRT_GIC_V2M].size);
-    qemu_fdt_setprop_cell(vms->fdt, "/intc/v2m", "phandle", vms->msi_phandle);
+    qemu_fdt_setprop_cell(vms->fdt, nodename, "phandle", vms->msi_phandle);
+    g_free(nodename);
 }
 
 static void fdt_add_gic_node(VirtMachineState *vms)
 {
+    char *nodename;
+
     vms->gic_phandle = qemu_fdt_alloc_phandle(vms->fdt);
     qemu_fdt_setprop_cell(vms->fdt, "/", "interrupt-parent", vms->gic_phandle);
 
-    qemu_fdt_add_subnode(vms->fdt, "/intc");
-    qemu_fdt_setprop_cell(vms->fdt, "/intc", "#interrupt-cells", 3);
-    qemu_fdt_setprop(vms->fdt, "/intc", "interrupt-controller", NULL, 0);
-    qemu_fdt_setprop_cell(vms->fdt, "/intc", "#address-cells", 0x2);
-    qemu_fdt_setprop_cell(vms->fdt, "/intc", "#size-cells", 0x2);
-    qemu_fdt_setprop(vms->fdt, "/intc", "ranges", NULL, 0);
+    nodename = g_strdup_printf("/intc@%" PRIx64,
+                               vms->memmap[VIRT_GIC_DIST].base);
+    qemu_fdt_add_subnode(vms->fdt, nodename);
+    qemu_fdt_setprop_cell(vms->fdt, nodename, "#interrupt-cells", 3);
+    qemu_fdt_setprop(vms->fdt, nodename, "interrupt-controller", NULL, 0);
+    qemu_fdt_setprop_cell(vms->fdt, nodename, "#address-cells", 0x2);
+    qemu_fdt_setprop_cell(vms->fdt, nodename, "#size-cells", 0x2);
+    qemu_fdt_setprop(vms->fdt, nodename, "ranges", NULL, 0);
     if (vms->gic_version == 3) {
         int nb_redist_regions = virt_gicv3_redist_region_count(vms);
 
-        qemu_fdt_setprop_string(vms->fdt, "/intc", "compatible",
+        qemu_fdt_setprop_string(vms->fdt, nodename, "compatible",
                                 "arm,gic-v3");
 
-        qemu_fdt_setprop_cell(vms->fdt, "/intc",
+        qemu_fdt_setprop_cell(vms->fdt, nodename,
                               "#redistributor-regions", nb_redist_regions);
 
         if (nb_redist_regions == 1) {
-            qemu_fdt_setprop_sized_cells(vms->fdt, "/intc", "reg",
+            qemu_fdt_setprop_sized_cells(vms->fdt, nodename, "reg",
                                          2, vms->memmap[VIRT_GIC_DIST].base,
                                          2, vms->memmap[VIRT_GIC_DIST].size,
                                          2, vms->memmap[VIRT_GIC_REDIST].base,
                                          2, vms->memmap[VIRT_GIC_REDIST].size);
         } else {
-            qemu_fdt_setprop_sized_cells(vms->fdt, "/intc", "reg",
+            qemu_fdt_setprop_sized_cells(vms->fdt, nodename, "reg",
                                          2, vms->memmap[VIRT_GIC_DIST].base,
                                          2, vms->memmap[VIRT_GIC_DIST].size,
                                          2, vms->memmap[VIRT_GIC_REDIST].base,
@@ -430,22 +444,23 @@ static void fdt_add_gic_node(VirtMachineState *vms)
         }
 
         if (vms->virt) {
-            qemu_fdt_setprop_cells(vms->fdt, "/intc", "interrupts",
+            qemu_fdt_setprop_cells(vms->fdt, nodename, "interrupts",
                                    GIC_FDT_IRQ_TYPE_PPI, ARCH_GICV3_MAINT_IRQ,
                                    GIC_FDT_IRQ_FLAGS_LEVEL_HI);
         }
     } else {
         /* 'cortex-a15-gic' means 'GIC v2' */
-        qemu_fdt_setprop_string(vms->fdt, "/intc", "compatible",
+        qemu_fdt_setprop_string(vms->fdt, nodename, "compatible",
                                 "arm,cortex-a15-gic");
-        qemu_fdt_setprop_sized_cells(vms->fdt, "/intc", "reg",
+        qemu_fdt_setprop_sized_cells(vms->fdt, nodename, "reg",
                                       2, vms->memmap[VIRT_GIC_DIST].base,
                                       2, vms->memmap[VIRT_GIC_DIST].size,
                                       2, vms->memmap[VIRT_GIC_CPU].base,
                                       2, vms->memmap[VIRT_GIC_CPU].size);
     }
 
-    qemu_fdt_setprop_cell(vms->fdt, "/intc", "phandle", vms->gic_phandle);
+    qemu_fdt_setprop_cell(vms->fdt, nodename, "phandle", vms->gic_phandle);
+    g_free(nodename);
 }
 
 static void fdt_add_pmu_nodes(const VirtMachineState *vms)
-- 
2.5.5

[Qemu-devel] [PATCH v4 3/3] hw/arm/virt: Silence dtc /memory warning

[Eric Auger]

When running dtc on the guest /proc/device-tree we get the
following warning: Warning (unit_address_vs_reg): Node /memory
has a reg or ranges property, but no unit name".

Let's fix that by adding the unit address to the node name. We also
don't create the /memory node anymore in create_fdt(). We directly
create it in load_dtb. /chosen still needs to be created in create_fdt
as the uart needs it. In case the user provided his own dtb, we nop
all memory nodes found in root and create new one(s).

Signed-off-by: Eric Auger <eric.auger@redhat.com>

---
v2 -> v3:
- only nop root nodes
- remove old comment
---
 hw/arm/boot.c | 41 +++++++++++++++++++++++------------------
 hw/arm/virt.c |  7 +------
 2 files changed, 24 insertions(+), 24 deletions(-)

diff --git a/hw/arm/boot.c b/hw/arm/boot.c
index 1e48166..e09201c 100644
--- a/hw/arm/boot.c
+++ b/hw/arm/boot.c
@@ -490,11 +490,13 @@ int arm_load_dtb(hwaddr addr, const struct arm_boot_info *binfo,
                  hwaddr addr_limit, AddressSpace *as)
 {
     void *fdt = NULL;
-    int size, rc;
+    int size, rc, n = 0;
     uint32_t acells, scells;
     char *nodename;
     unsigned int i;
     hwaddr mem_base, mem_len;
+    char **node_path;
+    Error *err = NULL;
 
     if (binfo->dtb_filename) {
         char *filename;
@@ -546,12 +548,21 @@ int arm_load_dtb(hwaddr addr, const struct arm_boot_info *binfo,
         goto fail;
     }
 
+    /* nop all root nodes matching /memory or /memory@unit-address */
+    node_path = qemu_fdt_node_unit_path(fdt, "memory", &err);
+    if (err) {
+        error_report_err(err);
+        goto fail;
+    }
+    while (node_path[n]) {
+        if (g_str_has_prefix(node_path[n], "/memory")) {
+            qemu_fdt_nop_node(fdt, node_path[n]);
+        }
+        n++;
+    }
+    g_strfreev(node_path);
+
     if (nb_numa_nodes > 0) {
-        /*
-         * Turn the /memory node created before into a NOP node, then create
-         * /memory@addr nodes for all numa nodes respectively.
-         */
-        qemu_fdt_nop_node(fdt, "/memory");
         mem_base = binfo->loader_start;
         for (i = 0; i < nb_numa_nodes; i++) {
             mem_len = numa_info[i].node_mem;
@@ -572,24 +583,18 @@ int arm_load_dtb(hwaddr addr, const struct arm_boot_info *binfo,
             g_free(nodename);
         }
     } else {
-        Error *err = NULL;
+        nodename = g_strdup_printf("/memory@%" PRIx64, binfo->loader_start);
+        qemu_fdt_add_subnode(fdt, nodename);
+        qemu_fdt_setprop_string(fdt, nodename, "device_type", "memory");
 
-        rc = fdt_path_offset(fdt, "/memory");
-        if (rc < 0) {
-            qemu_fdt_add_subnode(fdt, "/memory");
-        }
-
-        if (!qemu_fdt_getprop(fdt, "/memory", "device_type", NULL, &err)) {
-            qemu_fdt_setprop_string(fdt, "/memory", "device_type", "memory");
-        }
-
-        rc = qemu_fdt_setprop_sized_cells(fdt, "/memory", "reg",
+        rc = qemu_fdt_setprop_sized_cells(fdt, nodename, "reg",
                                           acells, binfo->loader_start,
                                           scells, binfo->ram_size);
         if (rc < 0) {
-            fprintf(stderr, "couldn't set /memory/reg\n");
+            fprintf(stderr, "couldn't set %s reg\n", nodename);
             goto fail;
         }
+        g_free(nodename);
     }
 
     rc = fdt_path_offset(fdt, "/chosen");
diff --git a/hw/arm/virt.c b/hw/arm/virt.c
index 6cce282..281ddcd 100644
--- a/hw/arm/virt.c
+++ b/hw/arm/virt.c
@@ -204,13 +204,8 @@ static void create_fdt(VirtMachineState *vms)
     qemu_fdt_setprop_cell(fdt, "/", "#address-cells", 0x2);
     qemu_fdt_setprop_cell(fdt, "/", "#size-cells", 0x2);
 
-    /*
-     * /chosen and /memory nodes must exist for load_dtb
-     * to fill in necessary properties later
-     */
+    /* /chosen must exist for load_dtb to fill in necessary properties later */
     qemu_fdt_add_subnode(fdt, "/chosen");
-    qemu_fdt_add_subnode(fdt, "/memory");
-    qemu_fdt_setprop_string(fdt, "/memory", "device_type", "memory");
 
     /* Clock node, for the benefit of the UART. The kernel device tree
      * binding documentation claims the PL011 node clock properties are
-- 
2.5.5

Re: [Qemu-devel] [PATCH v4 0/3] ARM virt: Silence dtc warnings

[Peter Maydell]

On 26 June 2018 at 21:21, Eric Auger <eric.auger@redhat.com> wrote:
> When running dtc on the guest /proc/device-tree, we get the
> following warnings: "Warning (unit_address_vs_reg): Node <name>
> has a reg or ranges property, but no unit name", with name:
> /intc, /intc/its, /intc/v2m, /memory.
>
> This series removes those warnings by adding the unit address to
> the corresponding node names.
>
> This is based on Peter's target-arm.next
>
> Best Regards
>


Applied to target-arm.next, thanks.

-- PMM