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ACPI: Teach ACPI table parsing about the CEDT header format

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The CEDT adds yet one more unique subtable header type where the length
is a 16-bit value. Extend the subtable helpers to detect this scenario.

Cc: "Rafael J. Wysocki" <rafael@kernel.org>
Cc: Len Brown <lenb@kernel.org>
Tested-by: Alison Schofield <alison.schofield@intel.com>
Reviewed-by: Alison Schofield <alison.schofield@intel.com>
Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Link: https://lore.kernel.org/r/163553709742.2509508.5177761945441327574.stgit@dwillia2-desk3.amr.corp.intel.com
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
This commit is contained in:
Dan Williams 2021-10-29 12:51:37 -07:00
parent f64bd790b7
commit ad2f63971e
2 changed files with 10 additions and 0 deletions
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9
drivers/acpi/tables.c
View File

@ -41,6 +41,7 @@ enum acpi_subtable_type {
ACPI_SUBTABLE_COMMON,
ACPI_SUBTABLE_HMAT,
ACPI_SUBTABLE_PRMT,
ACPI_SUBTABLE_CEDT,
};
struct acpi_subtable_entry {
@ -226,6 +227,8 @@ acpi_get_entry_type(struct acpi_subtable_entry *entry)
return entry->hdr->hmat.type;
case ACPI_SUBTABLE_PRMT:
return 0;
case ACPI_SUBTABLE_CEDT:
return entry->hdr->cedt.type;
}
return 0;
}
@ -240,6 +243,8 @@ acpi_get_entry_length(struct acpi_subtable_entry *entry)
return entry->hdr->hmat.length;
case ACPI_SUBTABLE_PRMT:
return entry->hdr->prmt.length;
case ACPI_SUBTABLE_CEDT:
return entry->hdr->cedt.length;
}
return 0;
}
@ -254,6 +259,8 @@ acpi_get_subtable_header_length(struct acpi_subtable_entry *entry)
return sizeof(entry->hdr->hmat);
case ACPI_SUBTABLE_PRMT:
return sizeof(entry->hdr->prmt);
case ACPI_SUBTABLE_CEDT:
return sizeof(entry->hdr->cedt);
}
return 0;
}
@ -265,6 +272,8 @@ acpi_get_subtable_type(char *id)
return ACPI_SUBTABLE_HMAT;
if (strncmp(id, ACPI_SIG_PRMT, 4) == 0)
return ACPI_SUBTABLE_PRMT;
if (strncmp(id, ACPI_SIG_CEDT, 4) == 0)
return ACPI_SUBTABLE_CEDT;
return ACPI_SUBTABLE_COMMON;
}

1
include/linux/acpi.h
View File

@ -133,6 +133,7 @@ union acpi_subtable_headers {
struct acpi_subtable_header common;
struct acpi_hmat_structure hmat;
struct acpi_prmt_module_header prmt;
struct acpi_cedt_header cedt;
};
typedef int (*acpi_tbl_table_handler)(struct acpi_table_header *table);