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cxl/acpi: Verify CHBS length for CXL2.0

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Per CXL Spec r3.1 Table 9-21, both CXL1.1 and CXL2.0 have defined their
own length, verify it to avoid an invalid CHBS.

Additionally, this patch also removes the redundant macro CXL_RCRB_SIZE,
favoring the use of `ACPI_CEDT_CHBS_LENGTH_CXL11`, which offers clearer
semantic meaning.

[DJ: Code edited for readability suggested by djbw]

Reviewed-by: Gregory Price <gourry@gourry.net>
Signed-off-by: Li Zhijian <lizhijian@fujitsu.com>
Reviewed-by: Dan Williams <dan.j.williams@intel.com>
Link: https://patch.msgid.link/20250410010545.99590-1-lizhijian@fujitsu.com
Signed-off-by: Dave Jiang <dave.jiang@intel.com>
This commit is contained in:
Li Zhijian
2025-04-10 09:05:45 +08:00
committed by Dave Jiang
parent cdafa67c02
commit 89963d5e69
1 changed files with 5 additions and 3 deletions
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8
drivers/cxl/acpi.c
View File

@@ -11,8 +11,6 @@
#include "cxlpci.h"
#include "cxl.h"
#define CXL_RCRB_SIZE SZ_8K
struct cxl_cxims_data {
int nr_maps;
u64 xormaps[] __counted_by(nr_maps);
@@ -479,7 +477,11 @@ static int cxl_get_chbs_iter(union acpi_subtable_headers *header, void *arg,
chbs = (struct acpi_cedt_chbs *) header;
if (chbs->cxl_version == ACPI_CEDT_CHBS_VERSION_CXL11 &&
chbs->length != CXL_RCRB_SIZE)
chbs->length != ACPI_CEDT_CHBS_LENGTH_CXL11)
return 0;
if (chbs->cxl_version == ACPI_CEDT_CHBS_VERSION_CXL20 &&
chbs->length != ACPI_CEDT_CHBS_LENGTH_CXL20)
return 0;
if (!chbs->base)