Commit 63f1789ec716("Ignore resources consumed by host bridge itself")
tries to ignore resources consumed by PCI host bridge itself by
checking IORESOURCE_WINDOW flag, which causes regression on some
platforms.
For example, PC Engines APU.1C platform defines PCI MMIO resources with
ACPI Memory32Fixed operator as below:
Name (CRES, ResourceTemplate ()
{
...
WordIO (ResourceProducer, MinFixed, MaxFixed, PosDecode,
0x0000, // Granularity
0x0D00, // Range Minimum
0xFFFF, // Range Maximum
0x0000, // Translation Offset
0xF300, // Length
,, , TypeStatic)
Memory32Fixed (ReadOnly,
0x000A0000, // Address Base
0x00020000, // Address Length
)
Memory32Fixed (ReadOnly,
0x00000000, // Address Base
0x00000000, // Address Length
_Y00)
})
Memory32Fixed operator doesn't support concept of "producer/consumer"
and it will be treated as "consumer" by the ACPI resource parsing
interface, thus cause regression. So the fix is only to check
"producer/consumer" flag for resources having "producer/consumer" flag.
Another possible fix is to only ignore IO resource consumed by host
bridge and keep IOMEM resource consumed by host bridge, please refer to:
http://www.spinics.net/lists/linux-pci/msg39706.html
Fixes: 63f1789ec716("Ignore resources consumed by host bridge itself")
Reported-by: Bernhard Thaler <bernhard.tha...@wvnet.at>
Signed-off-by: Jiang Liu <jiang....@linux.intel.com>
---
Hi Bernhard,
Could you please also help to test whether this patch works for
you too?
Thanks!
Gerry
---
arch/x86/pci/acpi.c | 5 ++---
drivers/acpi/resource.c | 3 +++
2 files changed, 5 insertions(+), 3 deletions(-)
diff --git a/arch/x86/pci/acpi.c b/arch/x86/pci/acpi.c
index e4695985f9de..8c4b1201f340 100644
--- a/arch/x86/pci/acpi.c
+++ b/arch/x86/pci/acpi.c
@@ -337,7 +337,7 @@ static void probe_pci_root_info(struct pci_root_info *info,
info->bridge = device;
ret = acpi_dev_get_resources(device, list,
acpi_dev_filter_resource_type_cb,
- (void *)(IORESOURCE_IO | IORESOURCE_MEM));
+ (void *)(IORESOURCE_IO | IORESOURCE_MEM |
IORESOURCE_WINDOW));
if (ret < 0)
dev_warn(&device->dev,
"failed to parse _CRS method, error code %d\n", ret);
@@ -346,8 +346,7 @@ static void probe_pci_root_info(struct pci_root_info *info,
"no IO and memory resources present in _CRS\n");
else
resource_list_for_each_entry_safe(entry, tmp, list) {
- if ((entry->res->flags & IORESOURCE_WINDOW) == 0 ||
- (entry->res->flags & IORESOURCE_DISABLED))
+ if (entry->res->flags & IORESOURCE_DISABLED)
resource_list_destroy_entry(entry);
else
entry->res->name = info->name;
diff --git a/drivers/acpi/resource.c b/drivers/acpi/resource.c
index 5589a6e2a023..b0d3f2ceef06 100644
--- a/drivers/acpi/resource.c
+++ b/drivers/acpi/resource.c
@@ -606,6 +606,9 @@ int acpi_dev_filter_resource_type(struct acpi_resource
*ares,
case ACPI_RESOURCE_TYPE_ADDRESS32:
case ACPI_RESOURCE_TYPE_ADDRESS64:
case ACPI_RESOURCE_TYPE_EXTENDED_ADDRESS64:
+ if (((types & IORESOURCE_WINDOW) == 0) ^
+ (ares->data.address.producer_consumer == ACPI_CONSUMER))
+ break;
if (ares->data.address.resource_type == ACPI_MEMORY_RANGE)
type = IORESOURCE_MEM;
else if (ares->data.address.resource_type == ACPI_IO_RANGE)
--
1.7.10.4
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