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Subject[PATCH 42/50] acpi/apei/einj: Add extensions to EINJ from rev 5.0 of acpi spec
Date
From: Tony Luck <tony.luck@intel.com>

ACPI 5.0 provides extensions to the EINJ mechanism to specify the
target for the error injection - by APICID for cpu related errors,
by address for memory related errors, and by segment/bus/device/function
for PCIe related errors. Also extensions for vendor specific error
injections.

Tested-by: Chen Gong <gong.chen@linux.intel.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>
---
Documentation/acpi/apei/einj.txt | 43 ++++++--
drivers/acpi/apei/einj.c | 217 +++++++++++++++++++++++++++++++------
include/acpi/actbl1.h | 3 +-
3 files changed, 215 insertions(+), 48 deletions(-)
diff --git a/Documentation/acpi/apei/einj.txt b/Documentation/acpi/apei/einj.txt
index 5cc699b..95a2b22 100644
--- a/Documentation/acpi/apei/einj.txt
+++ b/Documentation/acpi/apei/einj.txt
@@ -47,20 +47,41 @@ directory apei/einj. The following files are provided.

- param1
This file is used to set the first error parameter value. Effect of
- parameter depends on error_type specified. For memory error, this is
- physical memory address. Only available if param_extension module
- parameter is specified.
+ parameter depends on error_type specified.

- param2
This file is used to set the second error parameter value. Effect of
- parameter depends on error_type specified. For memory error, this is
- physical memory address mask. Only available if param_extension
- module parameter is specified.
+ parameter depends on error_type specified.

-Injecting parameter support is a BIOS version specific extension, that
-is, it only works on some BIOS version. If you want to use it, please
-make sure your BIOS version has the proper support and specify
-"param_extension=y" in module parameter.
+BIOS versions based in the ACPI 4.0 specification have limited options
+to control where the errors are injected. Your BIOS may support an
+extension (enabled with the param_extension=1 module parameter, or
+boot command line einj.param_extension=1). This allows the address
+and mask for memory injections to be specified by the param1 and
+param2 files in apei/einj.
+
+BIOS versions using the ACPI 5.0 specification have more control over
+the target of the injection. For processor related errors (type 0x1,
+0x2 and 0x4) the APICID of the target should be provided using the
+param1 file in apei/einj. For memory errors (type 0x8, 0x10 and 0x20)
+the address is set using param1 with a mask in param2 (0x0 is equivalent
+to all ones). For PCI express errors (type 0x80, 0x80 and 0x100) the
+segment, bus, device and function are specified using param1:
+
+ 31 24 23 16 15 11 10 8 7 0
+ +-------------------------------------------------+
+ | segment | bus | device | function | reserved |
+ +-------------------------------------------------+
+
+An ACPI 5.0 BIOS may also allow vendor specific errors to be injected.
+In this case a file named vendor will contain identifying information
+from the BIOS that hopefully will allow an application wishing to use
+the vendor specific extension to tell that they are running on a BIOS
+that supports it. All vendor extensions have the 0x80000000 bit set in
+error_type. A file vendor_flags controls the interpretation of param1
+and param2 (1 = PROCESSOR, 2 = MEMORY, 4 = PCI). See your BIOS vendor
+documentation for details (and expect changes to this API if vendors
+creativity in using this feature expands beyond our expectations).

For more information about EINJ, please refer to ACPI specification
-version 4.0, section 17.5.
+version 4.0, section 17.5 and ACPI 5.0, section 18.6.
diff --git a/drivers/acpi/apei/einj.c b/drivers/acpi/apei/einj.c
index 589b96c..1bc1f309 100644
--- a/drivers/acpi/apei/einj.c
+++ b/drivers/acpi/apei/einj.c
@@ -43,6 +43,42 @@
#define FIRMWARE_TIMEOUT (1 * NSEC_PER_MSEC)

/*
+ * ACPI version 5 provides a SET_ERROR_TYPE_WITH_ADDRESS action.
+ */
+static int acpi5;
+
+struct set_error_type_with_address {
+ u32 type;
+ u32 vendor_extension;
+ u32 flags;
+ u32 apicid;
+ u64 memory_address;
+ u64 memory_address_range;
+ u32 pcie_sbdf;
+};
+enum {
+ SETWA_FLAGS_APICID = 1,
+ SETWA_FLAGS_MEM = 2,
+ SETWA_FLAGS_PCIE_SBDF = 4,
+};
+
+/*
+ * Vendor extensions for platform specific operations
+ */
+struct vendor_error_type_extension {
+ u32 length;
+ u32 pcie_sbdf;
+ u16 vendor_id;
+ u16 device_id;
+ u8 rev_id;
+ u8 reserved[3];
+};
+
+static u32 vendor_flags;
+static struct debugfs_blob_wrapper vendor_blob;
+static char vendor_dev[64];
+
+/*
* Some BIOSes allow parameters to the SET_ERROR_TYPE entries in the
* EINJ table through an unpublished extension. Use with caution as
* most will ignore the parameter and make their own choice of address
@@ -103,7 +139,7 @@ static struct apei_exec_ins_type einj_ins_type[] = {
*/
static DEFINE_MUTEX(einj_mutex);

-static struct einj_parameter *einj_param;
+static void *einj_param;

#ifndef writeq
static inline void writeq(__u64 val, volatile void __iomem *addr)
@@ -158,10 +194,31 @@ static int einj_timedout(u64 *t)
return 0;
}

-static u64 einj_get_parameter_address(void)
+static void check_vendor_extension(u64 paddr,
+ struct set_error_type_with_address *v5param)
+{
+ int offset = readl(&v5param->vendor_extension);
+ struct vendor_error_type_extension *v;
+ u32 sbdf;
+
+ if (!offset)
+ return;
+ v = ioremap(paddr + offset, sizeof(*v));
+ if (!v)
+ return;
+ sbdf = readl(&v->pcie_sbdf);
+ sprintf(vendor_dev, "%x:%x:%x.%x vendor_id=%x device_id=%x rev_id=%x\n",
+ sbdf >> 24, (sbdf >> 16) & 0xff, (sbdf >> 11) & 0x1f, (sbdf >> 8) & 0x7,
+ readw(&v->vendor_id), readw(&v->device_id),
+ readb(&v->rev_id));
+ iounmap(v);
+}
+
+static void *einj_get_parameter_address(void)
{
int i;
- u64 paddr = 0;
+ u64 paddrv4 = 0, paddrv5 = 0;
+ void *param;
struct acpi_whea_header *entry;

entry = EINJ_TAB_ENTRY(einj_tab);
@@ -170,12 +227,40 @@ static u64 einj_get_parameter_address(void)
entry->instruction == ACPI_EINJ_WRITE_REGISTER &&
entry->register_region.space_id ==
ACPI_ADR_SPACE_SYSTEM_MEMORY)
- memcpy(&paddr, &entry->register_region.address,
- sizeof(paddr));
+ memcpy(&paddrv4, &entry->register_region.address,
+ sizeof(paddrv4));
+ if (entry->action == ACPI_EINJ_SET_ERROR_TYPE_WITH_ADDRESS &&
+ entry->instruction == ACPI_EINJ_WRITE_REGISTER &&
+ entry->register_region.space_id ==
+ ACPI_ADR_SPACE_SYSTEM_MEMORY)
+ memcpy(&paddrv5, &entry->register_region.address,
+ sizeof(paddrv5));
entry++;
}
+ if (paddrv5) {
+ struct set_error_type_with_address *v5param;
+
+ v5param = ioremap(paddrv5, sizeof(*v5param));
+ if (v5param) {
+ acpi5 = 1;
+ check_vendor_extension(paddrv5, v5param);
+ return v5param;
+ }
+ }
+ if (paddrv4) {
+ struct einj_parameter *v4param;
+
+ v4param = ioremap(paddrv4, sizeof(*v4param));
+ if (!v4param)
+ return 0;
+ if (readq(&v4param->reserved1) || readq(&v4param->reserved2)) {
+ iounmap(param);
+ return 0;
+ }
+ return v4param;
+ }

- return paddr;
+ return 0;
}

/* do sanity check to trigger table */
@@ -293,12 +378,56 @@ static int __einj_error_inject(u32 type, u64 param1, u64 param2)
if (rc)
return rc;
apei_exec_ctx_set_input(&ctx, type);
- rc = apei_exec_run(&ctx, ACPI_EINJ_SET_ERROR_TYPE);
- if (rc)
- return rc;
- if (einj_param) {
- writeq(param1, &einj_param->param1);
- writeq(param2, &einj_param->param2);
+ if (acpi5) {
+ struct set_error_type_with_address *v5param = einj_param;
+
+ writel(type, &v5param->type);
+ if (type & 0x80000000) {
+ switch (vendor_flags) {
+ case SETWA_FLAGS_APICID:
+ writel(param1, &v5param->apicid);
+ break;
+ case SETWA_FLAGS_MEM:
+ writeq(param1, &v5param->memory_address);
+ writeq(param2, &v5param->memory_address_range);
+ break;
+ case SETWA_FLAGS_PCIE_SBDF:
+ writel(param1, &v5param->pcie_sbdf);
+ break;
+ }
+ writel(vendor_flags, &v5param->flags);
+ } else {
+ switch (type) {
+ case ACPI_EINJ_PROCESSOR_CORRECTABLE:
+ case ACPI_EINJ_PROCESSOR_UNCORRECTABLE:
+ case ACPI_EINJ_PROCESSOR_FATAL:
+ writel(param1, &v5param->apicid);
+ writel(SETWA_FLAGS_APICID, &v5param->flags);
+ break;
+ case ACPI_EINJ_MEMORY_CORRECTABLE:
+ case ACPI_EINJ_MEMORY_UNCORRECTABLE:
+ case ACPI_EINJ_MEMORY_FATAL:
+ writeq(param1, &v5param->memory_address);
+ writeq(param2, &v5param->memory_address_range);
+ writel(SETWA_FLAGS_MEM, &v5param->flags);
+ break;
+ case ACPI_EINJ_PCIX_CORRECTABLE:
+ case ACPI_EINJ_PCIX_UNCORRECTABLE:
+ case ACPI_EINJ_PCIX_FATAL:
+ writel(param1, &v5param->pcie_sbdf);
+ writel(SETWA_FLAGS_PCIE_SBDF, &v5param->flags);
+ break;
+ }
+ }
+ } else {
+ rc = apei_exec_run(&ctx, ACPI_EINJ_SET_ERROR_TYPE);
+ if (rc)
+ return rc;
+ if (einj_param) {
+ struct einj_parameter *v4param = einj_param;
+ writeq(param1, &v4param->param1);
+ writeq(param2, &v4param->param2);
+ }
}
rc = apei_exec_run(&ctx, ACPI_EINJ_EXECUTE_OPERATION);
if (rc)
@@ -408,15 +537,25 @@ static int error_type_set(void *data, u64 val)
{
int rc;
u32 available_error_type = 0;
+ u32 tval, vendor;
+
+ /*
+ * Vendor defined types have 0x80000000 bit set, and
+ * are not enumerated by ACPI_EINJ_GET_ERROR_TYPE
+ */
+ vendor = val & 0x80000000;
+ tval = val & 0x7fffffff;

/* Only one error type can be specified */
- if (val & (val - 1))
- return -EINVAL;
- rc = einj_get_available_error_type(&available_error_type);
- if (rc)
- return rc;
- if (!(val & available_error_type))
+ if (tval & (tval - 1))
return -EINVAL;
+ if (!vendor) {
+ rc = einj_get_available_error_type(&available_error_type);
+ if (rc)
+ return rc;
+ if (!(val & available_error_type))
+ return -EINVAL;
+ }
error_type = val;

return 0;
@@ -455,7 +594,6 @@ static int einj_check_table(struct acpi_table_einj *einj_tab)
static int __init einj_init(void)
{
int rc;
- u64 param_paddr;
acpi_status status;
struct dentry *fentry;
struct apei_exec_context ctx;
@@ -509,23 +647,30 @@ static int __init einj_init(void)
rc = apei_exec_pre_map_gars(&ctx);
if (rc)
goto err_release;
- if (param_extension) {
- param_paddr = einj_get_parameter_address();
- if (param_paddr) {
- einj_param = ioremap(param_paddr, sizeof(*einj_param));
- rc = -ENOMEM;
- if (!einj_param)
- goto err_unmap;
- fentry = debugfs_create_x64("param1", S_IRUSR | S_IWUSR,
- einj_debug_dir, &error_param1);
- if (!fentry)
- goto err_unmap;
- fentry = debugfs_create_x64("param2", S_IRUSR | S_IWUSR,
- einj_debug_dir, &error_param2);
- if (!fentry)
- goto err_unmap;
- } else
- pr_warn(EINJ_PFX "Parameter extension is not supported.\n");
+
+ einj_param = einj_get_parameter_address();
+ if ((param_extension || acpi5) && einj_param) {
+ fentry = debugfs_create_x64("param1", S_IRUSR | S_IWUSR,
+ einj_debug_dir, &error_param1);
+ if (!fentry)
+ goto err_unmap;
+ fentry = debugfs_create_x64("param2", S_IRUSR | S_IWUSR,
+ einj_debug_dir, &error_param2);
+ if (!fentry)
+ goto err_unmap;
+ }
+
+ if (vendor_dev[0]) {
+ vendor_blob.data = vendor_dev;
+ vendor_blob.size = strlen(vendor_dev);
+ fentry = debugfs_create_blob("vendor", S_IRUSR,
+ einj_debug_dir, &vendor_blob);
+ if (!fentry)
+ goto err_unmap;
+ fentry = debugfs_create_x32("vendor_flags", S_IRUSR | S_IWUSR,
+ einj_debug_dir, &vendor_flags);
+ if (!fentry)
+ goto err_unmap;
}

pr_info(EINJ_PFX "Error INJection is initialized.\n");
diff --git a/include/acpi/actbl1.h b/include/acpi/actbl1.h
index 7504bc9..f25d7ef 100644
--- a/include/acpi/actbl1.h
+++ b/include/acpi/actbl1.h
@@ -228,7 +228,8 @@ enum acpi_einj_actions {
ACPI_EINJ_EXECUTE_OPERATION = 5,
ACPI_EINJ_CHECK_BUSY_STATUS = 6,
ACPI_EINJ_GET_COMMAND_STATUS = 7,
- ACPI_EINJ_ACTION_RESERVED = 8, /* 8 and greater are reserved */
+ ACPI_EINJ_SET_ERROR_TYPE_WITH_ADDRESS = 8,
+ ACPI_EINJ_ACTION_RESERVED = 9, /* 9 and greater are reserved */
ACPI_EINJ_TRIGGER_ERROR = 0xFF /* Except for this value */
};

--
1.7.9.rc1


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