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cxl/test: Enforce PMD alignment for volatile mock regions

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cxl_test allocates synthetic CFMWS HPA windows from a gen_pool with
SZ_256M alignment. On arm64 with CONFIG_ARM64_64K_PAGES=y and
CONFIG_PGTABLE_LEVELS=3, PMD_SIZE is 512M, so every CXL region carved
from a volatile window inherits a non-PMD-aligned start, and
cxl_dax_region_probe() -> alloc_dax_region() fails:

"""
    cxl_dax_region dax_region1: probe with driver cxl_dax_region failed
                                with error -12
"""

Enforce that every volatile mock CFMWS is PMD-aligned in both start and
size

Reviewed-by: Dave Jiang <dave.jiang@intel.com>
Acked-by: Kai-Heng Feng <kaihengf@nvidia.com>
Signed-off-by: Richard Cheng <icheng@nvidia.com>
Reviewed-by: Alison Schofield <alison.schofield@intel.com>
Link: https://patch.msgid.link/20260527090332.30002-1-icheng@nvidia.com
Signed-off-by: Dave Jiang <dave.jiang@intel.com>
This commit is contained in:
Richard Cheng 2026-05-27 17:03:32 +08:00 committed by Dave Jiang
parent 16329b510f
commit d40745cd06
1 changed files with 11 additions and 2 deletions
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13
tools/testing/cxl/test/cxl.c
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@ -318,7 +318,7 @@ static struct {
.restrictions = ACPI_CEDT_CFMWS_RESTRICT_HOSTONLYMEM |
ACPI_CEDT_CFMWS_RESTRICT_VOLATILE,
.qtg_id = FAKE_QTG_ID,
.window_size = SZ_256M,
.window_size = SZ_256M > PMD_SIZE ? SZ_256M : PMD_SIZE,
},
.target = { 3 },
},
@ -495,9 +495,12 @@ static int populate_cedt(void)
for (i = cfmws_start; i <= cfmws_end; i++) {
struct acpi_cedt_cfmws *window = mock_cfmws[i];
int align = SZ_256M;
cfmws_elc_update(window, i);
res = alloc_mock_res(window->window_size, SZ_256M);
if (window->restrictions & ACPI_CEDT_CFMWS_RESTRICT_VOLATILE)
align = max_t(int, SZ_256M, PMD_SIZE);
res = alloc_mock_res(window->window_size, align);
if (!res)
return -ENOMEM;
window->base_hpa = res->range.start;
@ -1819,6 +1822,12 @@ static __init int cxl_test_init(void)
int rc, i;
struct range mappable;
if (!IS_ALIGNED(mock_auto_region_size, PMD_SIZE)) {
pr_err_once("mock_auto_region_size %d must be PMD-aligned\n",
mock_auto_region_size);
return -EINVAL;
}
cxl_acpi_test();
cxl_core_test();
cxl_mem_test();