Patch v3 changes: applies cleanly to 3.7.0-rc3
The memory range descriptors in the _CRS control method contain an address
translation offset for host bridges. This value is used to translate addresses
across the bridge. The support to use _TRA values is present for other
architectures but not for X86 platforms.
For existing X86 platforms the _TRA value is zero.
Non-zero _TRA values are expected on future X86 platforms.
This change will register that value with the resource.
Signed-off-by: Mike Yoknis <mike.yoknis@xxxxxx>
---
arch/x86/pci/acpi.c | 21 ++++++++++++++++++---
1 file changed, 18 insertions(+), 3 deletions(-)
diff --git a/arch/x86/pci/acpi.c b/arch/x86/pci/acpi.c
index 192397c..9cecffc 100644
--- a/arch/x86/pci/acpi.c
+++ b/arch/x86/pci/acpi.c
@@ -12,6 +12,7 @@ struct pci_root_info {
char name[16];
unsigned int res_num;
struct resource *res;
+ resource_size_t *res_offset;
struct pci_sysdata sd;
#ifdef CONFIG_PCI_MMCONFIG
bool mcfg_added;
@@ -305,6 +306,7 @@ setup_resource(struct acpi_resource *acpi_res, void *data)
res->flags = flags;
res->start = start;
res->end = end;
+ info->res_offset[info->res_num] = addr.translation_offset;
if (!pci_use_crs) {
dev_printk(KERN_DEBUG, &info->bridge->dev,
@@ -374,7 +376,8 @@ static void add_resources(struct pci_root_info *info,
"ignoring host bridge window %pR (conflicts with %s %pR)\n",
res, conflict->name, conflict);
else
- pci_add_resource(resources, res);
+ pci_add_resource_offset(resources, res,
+ info->res_offset[i]);
}
}
@@ -382,6 +385,8 @@ static void free_pci_root_info_res(struct pci_root_info *info)
{
kfree(info->res);
info->res = NULL;
+ kfree(info->res_offset);
+ info->res_offset = NULL;
info->res_num = 0;
}
@@ -432,10 +437,20 @@ probe_pci_root_info(struct pci_root_info *info, struct acpi_device *device,
return;
size = sizeof(*info->res) * info->res_num;
- info->res_num = 0;
info->res = kzalloc(size, GFP_KERNEL);
- if (!info->res)
+ if (!info->res) {
+ info->res_num = 0;
+ return;
+ }
+
+ size = sizeof(*info->res_offset) * info->res_num;
+ info->res_num = 0;
+ info->res_offset = kzalloc(size, GFP_KERNEL);
+ if (!info->res_offset) {
+ kfree(info->res);
+ info->res = NULL;
return;
+ }
acpi_walk_resources(device->handle, METHOD_NAME__CRS, setup_resource,
info);
--
1.7.11.3
--
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