Minki/linux
1
0
Fork 1
mirror of https://github.com/torvalds/linux.git synced 2024-11-12 07:01:57 +00:00
Code Issues Packages Projects Releases Wiki Activity

ACPI, APEI, Resolve false conflict between ACPI NVS and APEI

Browse Source 
Some firmware will access memory in ACPI NVS region via APEI.  That
is, instructions in APEI ERST/EINJ table will read/write ACPI NVS
region.  The original resource conflict checking in APEI code will
check memory/ioport accessed by APEI via general resource management
mech.  But ACPI NVS region is marked as busy already, so that the
false resource conflict will prevent APEI ERST/EINJ to work.

To fix this, this patch excludes ACPI NVS regions when APEI components
request resources.  So that they will not conflict with ACPI NVS
regions.

Reported-and-tested-by: Pavel Ivanov <paivanof@gmail.com>
Signed-off-by: Huang Ying <ying.huang@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>
This commit is contained in:
Huang Ying 2011-12-08 11:25:50 +08:00 committed by Len Brown
parent b54ac6d2a2
commit 4134b8c881
1 changed files with 28 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

29
drivers/acpi/apei/apei-base.c
View File

@ -449,8 +449,19 @@ int apei_resources_sub(struct apei_resources *resources1,
}
EXPORT_SYMBOL_GPL(apei_resources_sub);
static int apei_get_nvs_callback(__u64 start, __u64 size, void *data)
{
struct apei_resources *resources = data;
return apei_res_add(&resources->iomem, start, size);
}
static int apei_get_nvs_resources(struct apei_resources *resources)
{
return acpi_nvs_for_each_region(apei_get_nvs_callback, resources);
}
/*
* IO memory/port rersource management mechanism is used to check
* IO memory/port resource management mechanism is used to check
* whether memory/port area used by GARs conflicts with normal memory
* or IO memory/port of devices.
*/
@ -459,12 +470,26 @@ int apei_resources_request(struct apei_resources *resources,
{
struct apei_res *res, *res_bak = NULL;
struct resource *r;
struct apei_resources nvs_resources;
int rc;
rc = apei_resources_sub(resources, &apei_resources_all);
if (rc)
return rc;
/*
* Some firmware uses ACPI NVS region, that has been marked as
* busy, so exclude it from APEI resources to avoid false
* conflict.
*/
apei_resources_init(&nvs_resources);
rc = apei_get_nvs_resources(&nvs_resources);
if (rc)
goto res_fini;
rc = apei_resources_sub(resources, &nvs_resources);
if (rc)
goto res_fini;
rc = -EINVAL;
list_for_each_entry(res, &resources->iomem, list) {
r = request_mem_region(res->start, res->end - res->start,
@ -511,6 +536,8 @@ err_unmap_iomem:
break;
release_mem_region(res->start, res->end - res->start);
}
res_fini:
apei_resources_fini(&nvs_resources);
return rc;
}
EXPORT_SYMBOL_GPL(apei_resources_request);