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| author | Dan Williams <dan.j.williams@intel.com> | 2022-07-22 17:56:09 -0700 |
|---|---|---|
| committer | Dan Williams <dan.j.williams@intel.com> | 2022-08-01 15:36:33 -0700 |
| commit | e77483055c325fa629c5835913b07f3dce3ac7fd (patch) | |
| tree | 495ef024370c09ba46e3e417913dadb969e06858 /drivers/cxl | |
| parent | 2bde6dbebc1cf02fd1b3d740246b92df1514a370 (diff) | |
| download | linux-e77483055c325fa629c5835913b07f3dce3ac7fd.tar.gz | |
cxl/acpi: Minimize granularity for x1 interleaves
The kernel enforces that region granularity is >= to the top-level interleave-granularity for the given CXL window. However, when the CXL window interleave is x1, i.e. non-interleaved at the host bridge level, then the specified granularity does not matter. Override the window specified granularity to the CXL minimum so that any valid region granularity is >= to the root granularity. Reported-by: Jonathan Cameron <Jonathan.Cameron@huawei.com> Reviewed-by: Vishal Verma <vishal.l.verma@intel.com> Reviewed-by: Alison Schofield <alison.schofield@intel.com> Link: https://lore.kernel.org/r/165853776917.2430596.16823264262010844458.stgit@dwillia2-xfh.jf.intel.com [djbw: add CXL_DECODER_MIN_GRANULARITY per vishal] Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Diffstat (limited to 'drivers/cxl')
| -rw-r--r-- | drivers/cxl/acpi.c | 6 | ||||
| -rw-r--r-- | drivers/cxl/cxl.h | 2 |
2 files changed, 8 insertions, 0 deletions
diff --git a/drivers/cxl/acpi.c b/drivers/cxl/acpi.c index eb436268b92c..fb649683dd3a 100644 --- a/drivers/cxl/acpi.c +++ b/drivers/cxl/acpi.c @@ -140,6 +140,12 @@ static int cxl_parse_cfmws(union acpi_subtable_headers *header, void *arg, .end = res->end, }; cxld->interleave_ways = ways; + /* + * Minimize the x1 granularity to advertise support for any + * valid region granularity + */ + if (ways == 1) + ig = CXL_DECODER_MIN_GRANULARITY; cxld->interleave_granularity = ig; rc = cxl_decoder_add(cxld, target_map); diff --git a/drivers/cxl/cxl.h b/drivers/cxl/cxl.h index 969953ce2609..bc604b7e44fb 100644 --- a/drivers/cxl/cxl.h +++ b/drivers/cxl/cxl.h @@ -248,6 +248,8 @@ enum cxl_decoder_type { */ #define CXL_DECODER_MAX_INTERLEAVE 16 +#define CXL_DECODER_MIN_GRANULARITY 256 + /** * struct cxl_decoder - Common CXL HDM Decoder Attributes * @dev: this decoder's device |