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Message-ID: <YW5OmSBM4mO1lDHs@Dennis-MBP.local>
Date: Tue, 19 Oct 2021 12:50:33 +0800
From: Xuesong Chen <xuesong.chen@...ux.alibaba.com>
To: catalin.marinas@....com, lorenzo.pieralisi@....com,
james.morse@....com, will@...nel.org, rafael@...nel.org,
tony.luck@...el.com, bp@...en8.de, mingo@...nel.org,
bhelgaas@...gle.com
Cc: linux-pci@...r.kernel.org, linux-acpi@...r.kernel.org,
linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
xuesong.chen@...ux.alibaba.com
Subject: [PATCH v3 2/2] ACPI: APEI: Filter the PCI MCFG address with an
arch-agnostic method
The commit d91525eb8ee6 ("ACPI, EINJ: Enhance error injection tolerance
level") fixes the issue that the ACPI/APEI can not access the PCI MCFG
address on x86 platform, but this issue can also happen on other
architectures, for instance, we got below error message on arm64 platform:
...
APEI: Can not request [mem 0x50100000-0x50100003] for APEI EINJ Trigger registers
...
This patch will try to handle this case in a more common way instead of the
original 'arch' specific solution, which will be beneficial to all the
APEI-dependent platforms after that.
Signed-off-by: Xuesong Chen <xuesong.chen@...ux.alibaba.com>
Reported-by: kernel test robot <lkp@...el.com>
Reviewed-by: Lorenzo Pieralisi <lorenzo.pieralisi@....com>
Cc: Catalin Marinas <catalin.marinas@....com>
Cc: James Morse <james.morse@....com>
Cc: Will Deacon <will@...nel.org>
Cc: Rafael. J. Wysocki <rafael@...nel.org>
Cc: Tony Luck <tony.luck@...el.com>
Cc: Tomasz Nowicki <tn@...ihalf.com>
---
arch/x86/pci/mmconfig-shared.c | 28 --------------------------
drivers/acpi/apei/apei-base.c | 45 ++++++++++++++++++++++++++++--------------
2 files changed, 30 insertions(+), 43 deletions(-)
diff --git a/arch/x86/pci/mmconfig-shared.c b/arch/x86/pci/mmconfig-shared.c
index 0b961fe6..12f7d96 100644
--- a/arch/x86/pci/mmconfig-shared.c
+++ b/arch/x86/pci/mmconfig-shared.c
@@ -605,32 +605,6 @@ static int __init pci_parse_mcfg(struct acpi_table_header *header)
return 0;
}
-#ifdef CONFIG_ACPI_APEI
-extern int (*arch_apei_filter_addr)(int (*func)(__u64 start, __u64 size,
- void *data), void *data);
-
-static int pci_mmcfg_for_each_region(int (*func)(__u64 start, __u64 size,
- void *data), void *data)
-{
- struct pci_mmcfg_region *cfg;
- int rc;
-
- if (list_empty(&pci_mmcfg_list))
- return 0;
-
- list_for_each_entry(cfg, &pci_mmcfg_list, list) {
- rc = func(cfg->res.start, resource_size(&cfg->res), data);
- if (rc)
- return rc;
- }
-
- return 0;
-}
-#define set_apei_filter() (arch_apei_filter_addr = pci_mmcfg_for_each_region)
-#else
-#define set_apei_filter()
-#endif
-
static void __init __pci_mmcfg_init(int early)
{
pci_mmcfg_reject_broken(early);
@@ -665,8 +639,6 @@ void __init pci_mmcfg_early_init(void)
else
acpi_table_parse(ACPI_SIG_MCFG, pci_parse_mcfg);
__pci_mmcfg_init(1);
-
- set_apei_filter();
}
}
diff --git a/drivers/acpi/apei/apei-base.c b/drivers/acpi/apei/apei-base.c
index c7fdb12..daae75a 100644
--- a/drivers/acpi/apei/apei-base.c
+++ b/drivers/acpi/apei/apei-base.c
@@ -21,6 +21,7 @@
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
+#include <linux/pci.h>
#include <linux/acpi.h>
#include <linux/slab.h>
#include <linux/io.h>
@@ -448,13 +449,34 @@ static int apei_get_nvs_resources(struct apei_resources *resources)
return acpi_nvs_for_each_region(apei_get_res_callback, resources);
}
-int (*arch_apei_filter_addr)(int (*func)(__u64 start, __u64 size,
- void *data), void *data);
-static int apei_get_arch_resources(struct apei_resources *resources)
+#ifdef CONFIG_PCI
+extern struct list_head pci_mmcfg_list;
+static int apei_filter_mcfg_addr(struct apei_resources *res,
+ struct apei_resources *mcfg_res)
+{
+ int rc = 0;
+ struct pci_mmcfg_region *cfg;
+
+ if (list_empty(&pci_mmcfg_list))
+ return 0;
+
+ apei_resources_init(mcfg_res);
+ list_for_each_entry(cfg, &pci_mmcfg_list, list) {
+ rc = apei_res_add(&mcfg_res->iomem, cfg->res.start, resource_size(&cfg->res));
+ if (rc)
+ return rc;
+ }
+ /* filter the mcfg resource from current APEI's */
+ return apei_resources_sub(res, mcfg_res);
+}
+#else
+static inline int apei_filter_mcfg_addr(struct apei_resources *res,
+ struct apei_resources *mcfg_res)
{
- return arch_apei_filter_addr(apei_get_res_callback, resources);
+ return 0;
}
+#endif
/*
* IO memory/port resource management mechanism is used to check
@@ -486,15 +508,9 @@ int apei_resources_request(struct apei_resources *resources,
if (rc)
goto nvs_res_fini;
- if (arch_apei_filter_addr) {
- apei_resources_init(&arch_res);
- rc = apei_get_arch_resources(&arch_res);
- if (rc)
- goto arch_res_fini;
- rc = apei_resources_sub(resources, &arch_res);
- if (rc)
- goto arch_res_fini;
- }
+ rc = apei_filter_mcfg_addr(resources, &arch_res);
+ if (rc)
+ goto arch_res_fini;
rc = -EINVAL;
list_for_each_entry(res, &resources->iomem, list) {
@@ -544,8 +560,7 @@ int apei_resources_request(struct apei_resources *resources,
release_mem_region(res->start, res->end - res->start);
}
arch_res_fini:
- if (arch_apei_filter_addr)
- apei_resources_fini(&arch_res);
+ apei_resources_fini(&arch_res);
nvs_res_fini:
apei_resources_fini(&nvs_resources);
return rc;
--
1.8.3.1
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