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ACPI: APEI: EINJ: Discover EINJv2 parameters

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The EINJv2 set_error_type_with_address structure has a flex array
to hold the component IDs and syndrome values used when injecting
multiple errors at once.

Discover the size of this array by taking the address from the
ACPI_EINJ_SET_ERROR_TYPE_WITH_ADDRESS entry in the EINJ table
and reading the BIOS copy of the structure.

Derive the maximum number of components from the length field
in the einjv2_extension_struct at the end of the BIOS copy.

Map the whole of the structure into kernel memory (and unmap
on module unload).

[Tony: Code unchanged from Zaid's original. New commit message]

Reviewed-by: Tony Luck <tony.luck@intel.com>
Reviewed-by: Ira Weiny <ira.weiny@intel.com>
Signed-off-by: Zaid Alali <zaidal@os.amperecomputing.com>
Link: https://patch.msgid.link/20250617193026.637510-5-zaidal@os.amperecomputing.com
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Zaid Alali 2025-06-17 12:30:23 -07:00 committed by Rafael J. Wysocki
parent 21cd921b1a
commit 691a0f0a55
1 changed files with 24 additions and 2 deletions
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26
drivers/acpi/apei/einj-core.c
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@ -108,6 +108,7 @@ static struct debugfs_blob_wrapper vendor_blob;
static struct debugfs_blob_wrapper vendor_errors;
static char vendor_dev[64];
static u32 max_nr_components;
static u32 available_error_type;
static u32 available_error_type_v2;
@ -178,6 +179,7 @@ static DEFINE_MUTEX(einj_mutex);
bool einj_initialized __ro_after_init;
static void __iomem *einj_param;
static u32 v5param_size;
static void einj_exec_ctx_init(struct apei_exec_context *ctx)
{
@ -302,11 +304,31 @@ static void __iomem *einj_get_parameter_address(void)
struct set_error_type_with_address v5param;
struct set_error_type_with_address __iomem *p;
v5param_size = sizeof(v5param);
p = acpi_os_map_iomem(pa_v5, sizeof(*p));
if (p) {
memcpy_fromio(&v5param, p, sizeof(v5param));
int offset, len;
memcpy_fromio(&v5param, p, v5param_size);
acpi5 = 1;
check_vendor_extension(pa_v5, &v5param);
if (available_error_type & ACPI65_EINJV2_SUPP) {
len = v5param.einjv2_struct.length;
offset = offsetof(struct einjv2_extension_struct, component_arr);
max_nr_components = (len - offset) /
sizeof(v5param.einjv2_struct.component_arr[0]);
/*
* The first call to acpi_os_map_iomem above does not include the
* component array, instead it is used to read and calculate maximum
* number of components supported by the system. Below, the mapping
* is expanded to include the component array.
*/
acpi_os_unmap_iomem(p, v5param_size);
offset = offsetof(struct set_error_type_with_address, einjv2_struct);
v5param_size = offset + struct_size(&v5param.einjv2_struct,
component_arr, max_nr_components);
p = acpi_os_map_iomem(pa_v5, v5param_size);
}
return p;
}
}
@ -933,7 +955,7 @@ static void __exit einj_remove(struct faux_device *fdev)
if (einj_param) {
acpi_size size = (acpi5) ?
sizeof(struct set_error_type_with_address) :
v5param_size :
sizeof(struct einj_parameter);
acpi_os_unmap_iomem(einj_param, size);