x86/PCI: Allow x86 platforms to use translation offsets
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@hp.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
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 @@
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 @@
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 @@
"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 @@
{
kfree(info->res);
info->res = NULL;
+ kfree(info->res_offset);
+ info->res_offset = NULL;
info->res_num = 0;
}
@@ -432,10 +437,20 @@
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);