Dan Williams 1423885c84 cxl/hdm: Use 4-byte reads to retrieve HDM decoder base+limit ... The CXL specification mandates that 4-byte registers must be accessed with 4-byte access cycles. CXL 3.0 8.2.3 "Component Register Layout and Definition" states that the behavior is undefined if (2) 32-bit registers are accessed as an 8-byte quantity. It turns out that at least one hardware implementation is sensitive to this in practice. The @size variable results in zero with: size = readq(hdm + CXL_HDM_DECODER0_SIZE_LOW_OFFSET(which)); ...and the correct size with: lo = readl(hdm + CXL_HDM_DECODER0_SIZE_LOW_OFFSET(which)); hi = readl(hdm + CXL_HDM_DECODER0_SIZE_HIGH_OFFSET(which)); size = (hi << 32) + lo; Fixes: d17d0540a0 ("cxl/core/hdm: Add CXL standard decoder enumeration to the core") Cc: <stable@vger.kernel.org> Reviewed-by: Dave Jiang <dave.jiang@intel.com> Reviewed-by: Alison Schofield <alison.schofield@intel.com> Link: https://lore.kernel.org/r/168149844056.792294.8224490474529733736.stgit@dwillia2-xfh.jf.intel.com Signed-off-by: Dan Williams <dan.j.williams@intel.com>		2023-04-18 10:32:46 -07:00
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core	cxl/hdm: Use 4-byte reads to retrieve HDM decoder base+limit	2023-04-18 10:32:46 -07:00
acpi.c	Merge branch 'for-6.3/cxl-ram-region' into cxl/next	2023-02-10 18:11:01 -08:00
cxl.h	cxl/port: Fix find_cxl_root() for RCDs and simplify it	2023-04-04 15:34:34 -07:00
cxlmem.h	cxl for v6.3	2023-02-25 09:19:23 -08:00
cxlpci.h	cxl/pci: Handle truncated CDAT entries	2023-04-03 16:16:34 -07:00
Kconfig	Merge branch 'for-6.3/cxl-ram-region' into cxl/next	2023-02-10 18:11:01 -08:00
Makefile	cxl/pmem: Introduce nvdimm_security_ops with ->get_flags() operation	2022-11-30 16:30:47 -08:00
mem.c	cxl/port: Add RCD endpoint port enumeration	2022-12-05 10:32:26 -08:00
pci.c	Merge branch 'for-6.3/cxl' into cxl/next	2023-02-14 15:06:08 -08:00
pmem.c	cxl/pmem: Fix nvdimm registration races	2023-02-13 17:01:05 -08:00
port.c	cxl/port: Fix find_cxl_root() for RCDs and simplify it	2023-04-04 15:34:34 -07:00
security.c	cxl/mbox: Enable cxl_mbox_send_cmd() users to validate output size	2022-12-06 14:36:02 -08:00