[Patch v7 7/7] ia64/PCI/ACPI: Use common interface to support PCI host bridge

Jiang Liu
2015-10-14T06:26:09Z

Use common interface to simplify PCI host bridge implementation.

Tested-by: Tony Luck <tony.luck@intel.com>
Signed-off-by: Jiang Liu <jiang.liu@linux.intel.com>
Signed-off-by: Liu Jiang <jiang.liu@linux.intel.com>
---
arch/ia64/pci/pci.c | 235 +++++++++++----------------------------------------
1 file changed, 48 insertions(+), 187 deletions(-)

diff --git a/arch/ia64/pci/pci.c b/arch/ia64/pci/pci.c
index b1846b891ea5..8f6ac2f8ae4c 100644
--- a/arch/ia64/pci/pci.c
+++ b/arch/ia64/pci/pci.c
@@ -116,15 +116,12 @@ struct pci_ops pci_root_ops = {
};

struct pci_root_info {
+ struct acpi_pci_root_info common;
struct pci_controller controller;
- struct acpi_device *bridge;
- struct list_head resources;
struct list_head io_resources;
- char name[16];
};

-static unsigned int
-new_space (u64 phys_base, int sparse)
+static unsigned int new_space(u64 phys_base, int sparse)
{
u64 mmio_base;
int i;
@@ -160,11 +157,11 @@ static int add_io_space(struct device *dev, struct pci_root_info *info,
unsigned long base, min, max, base_port;
unsigned int sparse = 0, space_nr, len;

- len = strlen(info->name) + 32;
+ len = strlen(info->common.name) + 32;
iospace = resource_list_create_entry(NULL, len);
if (!iospace) {
dev_err(dev, "PCI: No memory for %s I/O port space\n",
- info->name);
+ info->common.name);
return -ENOMEM;
}

@@ -179,7 +176,7 @@ static int add_io_space(struct device *dev, struct pci_root_info *info,
max = res->end - entry->offset;
base = __pa(io_space[space_nr].mmio_base);
base_port = IO_SPACE_BASE(space_nr);
- snprintf(name, len, "%s I/O Ports %08lx-%08lx", info->name,
+ snprintf(name, len, "%s I/O Ports %08lx-%08lx", info->common.name,
base_port + min, base_port + max);

/*
@@ -234,217 +231,81 @@ static bool resource_is_pcicfg_ioport(struct resource *res)
res->start == 0xCF8 && res->end == 0xCFF;
}

-static int
-probe_pci_root_info(struct pci_root_info *info, struct acpi_device *device,
- int busnum, int domain)
+static int pci_acpi_root_prepare_resources(struct acpi_pci_root_info *ci)
{
- int ret;
- struct list_head *list = &info->resources;
+ struct device *dev = &ci->bridge->dev;
+ struct pci_root_info *info;
+ struct resource *res;
struct resource_entry *entry, *tmp;
-
- ret = acpi_dev_get_resources(device, list,
- acpi_dev_filter_resource_type_cb,
- (void *)(IORESOURCE_IO | IORESOURCE_MEM));
- if (ret < 0)
- dev_warn(&device->dev,
- "failed to parse _CRS method, error code %d\n", ret);
- else if (ret == 0)
- dev_dbg(&device->dev,
- "no IO and memory resources present in _CRS\n");
- else
- resource_list_for_each_entry_safe(entry, tmp, list) {
- if ((entry->res->flags & IORESOURCE_DISABLED) ||
- resource_is_pcicfg_ioport(entry->res))
- resource_list_destroy_entry(entry);
- else
- entry->res->name = info->name;
- }
-
- return ret;
-}
-
-static void validate_resources(struct device *dev, struct list_head *resources,
- unsigned long type)
-{
- LIST_HEAD(list);
- struct resource *res1, *res2, *root = NULL;
- struct resource_entry *tmp, *entry, *entry2;
-
- BUG_ON((type & (IORESOURCE_MEM | IORESOURCE_IO)) == 0);
- root = (type & IORESOURCE_MEM) ? &iomem_resource : &ioport_resource;
-
- list_splice_init(resources, &list);
- resource_list_for_each_entry_safe(entry, tmp, &list) {
- bool free = false;
- resource_size_t end;
-
- res1 = entry->res;
- if (!(res1->flags & type))
- goto next;
-
- /* Exclude non-addressable range or non-addressable portion */
- end = min(res1->end, root->end);
- if (end <= res1->start) {
- dev_info(dev, "host bridge window %pR (ignored, not CPU addressable)\n",
- res1);
- free = true;
- goto next;
- } else if (res1->end != end) {
- dev_info(dev, "host bridge window %pR ([%#llx-%#llx] ignored, not CPU addressable)\n",
- res1, (unsigned long long)end + 1,
- (unsigned long long)res1->end);
- res1->end = end;
- }
-
- resource_list_for_each_entry(entry2, resources) {
- res2 = entry2->res;
- if (!(res2->flags & type))
- continue;
-
- /*
- * I don't like throwing away windows because then
- * our resources no longer match the ACPI _CRS, but
- * the kernel resource tree doesn't allow overlaps.
- */
- if (resource_overlaps(res1, res2)) {
- res2->start = min(res1->start, res2->start);
- res2->end = max(res1->end, res2->end);
- dev_info(dev, "host bridge window expanded to %pR; %pR ignored\n",
- res2, res1);
- free = true;
- goto next;
+ int status;
+
+ status = acpi_pci_probe_root_resources(ci);
+ if (status > 0) {
+ info = container_of(ci, struct pci_root_info, common);
+ resource_list_for_each_entry_safe(entry, tmp, &ci->resources) {
+ res = entry->res;
+ if (res->flags & IORESOURCE_MEM) {
+ /*
+ * HP's firmware has a hack to work around a
+ * Windows bug. Ignore these tiny memory ranges.
+ */
+ if (resource_size(res) <= 16) {
+ resource_list_del(entry);
+ insert_resource(&iomem_resource,
+ entry->res);
+ resource_list_add_tail(entry,
+ &info->io_resources);
+ }
+ } else if (res->flags & IORESOURCE_IO) {
+ if (resource_is_pcicfg_ioport(entry->res))
+ resource_list_destroy_entry(entry);
+ else if (add_io_space(dev, info, entry))
+ resource_list_destroy_entry(entry);
}
}
-
-next:
- resource_list_del(entry);
- if (free)
- resource_list_free_entry(entry);
- else
- resource_list_add_tail(entry, resources);
}
-}

-static void add_resources(struct pci_root_info *info, struct device *dev)
-{
- struct resource_entry *entry, *tmp;
- struct resource *res, *conflict, *root = NULL;
- struct list_head *list = &info->resources;
-
- validate_resources(dev, list, IORESOURCE_MEM);
- validate_resources(dev, list, IORESOURCE_IO);
-
- resource_list_for_each_entry_safe(entry, tmp, list) {
- res = entry->res;
- if (res->flags & IORESOURCE_MEM) {
- root = &iomem_resource;
- /*
- * HP's firmware has a hack to work around a Windows
- * bug. Ignore these tiny memory ranges.
- */
- if (resource_size(res) <= 16) {
- resource_list_destroy_entry(entry);
- continue;
- }
- } else if (res->flags & IORESOURCE_IO) {
- root = &ioport_resource;
- if (add_io_space(&info->bridge->dev, info, entry)) {
- resource_list_destroy_entry(entry);
- continue;
- }
- } else {
- BUG_ON(res);
- }
-
- conflict = insert_resource_conflict(root, res);
- if (conflict) {
- dev_info(dev,
- "ignoring host bridge window %pR (conflicts with %s %pR)\n",
- res, conflict->name, conflict);
- resource_list_destroy_entry(entry);
- }
- }
+ return status;
}

-static void __release_pci_root_info(struct pci_root_info *info)
+static void pci_acpi_root_release_info(struct acpi_pci_root_info *ci)
{
- struct resource *res;
- struct resource_entry *entry, *tentry;
+ struct pci_root_info *info;
+ struct resource_entry *entry, *tmp;

- resource_list_for_each_entry_safe(entry, tentry, &info->io_resources) {
+ info = container_of(ci, struct pci_root_info, common);
+ resource_list_for_each_entry_safe(entry, tmp, &info->io_resources) {
release_resource(entry->res);
resource_list_destroy_entry(entry);
}
-
- resource_list_for_each_entry_safe(entry, tentry, &info->resources) {
- res = entry->res;
- if (res->parent &&
- (res->flags & (IORESOURCE_MEM | IORESOURCE_IO)))
- release_resource(res);
- resource_list_destroy_entry(entry);
- }
-
kfree(info);
}

-static void release_pci_root_info(struct pci_host_bridge *bridge)
-{
- struct pci_root_info *info = bridge->release_data;
-
- __release_pci_root_info(info);
-}
+static struct acpi_pci_root_ops pci_acpi_root_ops = {
+ .pci_ops = &pci_root_ops,
+ .release_info = pci_acpi_root_release_info,
+ .prepare_resources = pci_acpi_root_prepare_resources,
+};

struct pci_bus *pci_acpi_scan_root(struct acpi_pci_root *root)
{
struct acpi_device *device = root->device;
- int domain = root->segment;
- int bus = root->secondary.start;
struct pci_root_info *info;
- struct pci_bus *pbus;
- int ret;

info = kzalloc(sizeof(*info), GFP_KERNEL);
if (!info) {
dev_err(&device->dev,
"pci_bus %04x:%02x: ignored (out of memory)\n",
- domain, bus);
+ root->segment, (int)root->secondary.start);
return NULL;
}

- info->controller.segment = domain;
+ info->controller.segment = root->segment;
info->controller.companion = device;
info->controller.node = acpi_get_node(device->handle);
- info->bridge = device;
- INIT_LIST_HEAD(&info->resources);
INIT_LIST_HEAD(&info->io_resources);
- snprintf(info->name, sizeof(info->name),
- "PCI Bus %04x:%02x", domain, bus);
-
- ret = probe_pci_root_info(info, device, bus, domain);
- if (ret <= 0) {
- kfree(info);
- return NULL;
- }
- add_resources(info, &info->bridge->dev);
- pci_add_resource(&info->resources, &root->secondary);
-
- /*
- * See arch/x86/pci/acpi.c.
- * The desired pci bus might already be scanned in a quirk. We
- * should handle the case here, but it appears that IA64 hasn't
- * such quirk. So we just ignore the case now.
- */
- pbus = pci_create_root_bus(NULL, bus, &pci_root_ops,
- &info->controller, &info->resources);
- if (!pbus) {
- __release_pci_root_info(info);
- return NULL;
- }
-
- pci_set_host_bridge_release(to_pci_host_bridge(pbus->bridge),
- release_pci_root_info, info);
- pci_scan_child_bus(pbus);
- return pbus;
+ return acpi_pci_root_create(root, &pci_acpi_root_ops,
+ &info->common, &info->controller);
}

int pcibios_root_bridge_prepare(struct pci_host_bridge *bridge)
--
1.7.10.4