The cxlctl_validate_set_features() function is type bool. It's supposed
to return true for valid requests and false for invalid. However, this
error path returns ERR_PTR(-EINVAL) which is true when it was intended to
return false.
The incorrect return will result in kernel failing to prevent a
incorrect op_size passed in from userspace to be detected.
[ dj: Add user impact to commit log ]
Fixes: f76e0bbc8b ("cxl: Update prototype of function get_support_feature_info()")
Signed-off-by: Dan Carpenter <dan.carpenter@linaro.org>
Reviewed-by: Ira Weiny <ira.weiny@intel.com>
Link: https://patch.msgid.link/aDbFPSCujpJLY1if@stanley.mountain
Signed-off-by: Dave Jiang <dave.jiang@intel.com>
Add CXL RAS Features support. Features include "patrol scrub control",
"error check scrub", "perform maintenance", and "memory sparing". This
support connects the RAS Featurs to EDAC.
to_cxlfs() was declared 'inline' in the header but only defined in
drivers/cxl/core/features.c. This has worked because features.c was
the only file using the function and the definition happened to be
available in the same compilation unit.
However, in preparation for a second .c file using the header and
needing to call the function, the inline specifier became an issue.
Sparse flagged the declaration as invalid since 'inline' requires a
visible definition at the point of use.
Defining the function in the header was considered but rejected, as
it depends on internal symbols not visible at that level.
Remove the inline specifier to correct the linkage violation.
Signed-off-by: Alison Schofield <alison.schofield@intel.com>
Reviewed-by: Dave Jiang <dave.jiang@intel.com>
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Reviewed-by: Shiju Jose <shiju.jose@huawei.com>
Link: https://patch.msgid.link/20250521233625.1745849-1-alison.schofield@intel.com
Signed-off-by: Dave Jiang <dave.jiang@intel.com>
pmem.c regs.c mbox.c identifiers were missing. Add them to
memory-devices.rst following their respective DOC comment includes.
Two acpi.c identifiers were available, but not used in kernel-doc's:
1) Add add_cxl_resources to memory-devices.rst and fix up the Sphinx
complaint on the ascii art by escaping it.
2) Add cxl_acpi_evaluate_qtg_dsm to access-coordinates.rst.
core/features.c is new. Add a "DOC: cxl features" comment to the
source and identifiers to memory_devices.rst.
Signed-off-by: Alison Schofield <alison.schofield@intel.com>
Reviewed-by: Ira Weiny <ira.weiny@intel.com>
Link: https://patch.msgid.link/20250513215813.1419645-1-alison.schofield@intel.com
Signed-off-by: Dave Jiang <dave.jiang@intel.com>
CXL subsystem supports userspace to configure features via fwctl
interface, it will configure features by using Set Feature command.
Whatever Set Feature succeeds or fails, CXL driver always needs to
return a structure fwctl_rpc_cxl_out to caller, and returned size is
updated in a out_len parameter. The out_len should be updated not only
when the set feature succeeds, but also when the set feature fails.
Fixes: eb5dfcb9e3 ("cxl: Add support to handle user feature commands for set feature")
Signed-off-by: Li Ming <ming.li@zohomail.com>
Reviewed-by: Dave Jiang <dave.jiang@intel.com>
Reviewed-by: Ira Weiny <ira.weiny@intel.com>
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Link: https://patch.msgid.link/20250410024521.514095-1-ming.li@zohomail.com
Signed-off-by: Dave Jiang <dave.jiang@intel.com>
Testing revealed the following error message for a CXL memdev that has
Feature support:
[ 56.690430] cxl mem0: Resources present before probing
Attach the allocation of cxl_fwctl to the parent device of cxl_memdev.
devm_add_* calls for cxl_memdev should not happen before the memdev
probe function or outside the scope of the memdev driver.
cxl_test missed this bug because cxl_test always arranges for the
cxl_mem driver to be loaded before cxl_mock_mem runs. So the driver core
always finds the devres list idle in that case.
[DJ: Updated subject title and added commit log suggestion from djbw]
Fixes: 858ce2f56b ("cxl: Add FWCTL support to CXL")
Reviewed-by: Dan Williams <dan.j.williams@intel.com>
Reviewed-by: Alison Schofield <alison.schofield@intel.com>
Link: https://lore.kernel.org/linux-cxl/6801aea053466_71fe2944c@dwillia2-xfh.jf.intel.com.notmuch/
Link: https://patch.msgid.link/20250418002933.406439-1-dave.jiang@intel.com
Signed-off-by: Dave Jiang <dave.jiang@intel.com>
fwctl provides a fwctl_ops->fw_rpc() callback in order to issue ioctls
to a device. The cxl fwctl driver will start by supporting the CXL
Feature commands: Get Supported Features, Get Feature, and Set Feature.
The fw_rpc() callback provides 'enum fwctl_rpc_scope' parameter where
it indicates the security scope of the call. The Get Supported Features
and Get Feature calls can be executed with the scope of
FWCTL_RPC_CONFIGRATION. The Set Feature call is gated by the effects
of the Feature reported by Get Supported Features call for the specific
Feature.
Only "Get Supported Features" is supported in this patch. Additional
commands will be added in follow on patches. "Get Supported Features"
will filter the Features that are exclusive to the kernel. The flag
field of the Feature details will be cleared of the "Changeable"
field and the "set feat size" will be set to 0 to indicate that
the feature is not changeable.
Link: https://patch.msgid.link/r/20250307205648.1021626-4-dave.jiang@intel.com
Reviewed-by: Dan Williams <dan.j.williams@intel.com>
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Reviewed-by: Li Ming <ming.li@zohomail.com>
Signed-off-by: Dave Jiang <dave.jiang@intel.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
Add fwctl support code to allow sending of CXL feature commands from
userspace through as ioctls via FWCTL. Provide initial setup bits. The
CXL PCI probe function will call devm_cxl_setup_fwctl() after the
cxl_memdev has been enumerated in order to setup FWCTL char device under
the cxl_memdev like the existing memdev char device for issuing CXL raw
mailbox commands from userspace via ioctls.
Link: https://patch.msgid.link/r/20250307205648.1021626-2-dave.jiang@intel.com
Signed-off-by: Dave Jiang <dave.jiang@intel.com>
Reviewed-by: Li Ming <ming.li@zohomail.com>
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
CXL spec r3.2 8.2.9.6.1 Get Supported Features (Opcode 0500h)
The command retrieve the list of supported device-specific features
(identified by UUID) and general information about each Feature.
The driver will retrieve the Feature entries in order to make checks and
provide information for the Get Feature and Set Feature command. One of
the main piece of information retrieved are the effects a Set Feature
command would have for a particular feature. The retrieved Feature
entries are stored in the cxl_mailbox context.
The setup of Features is initiated via devm_cxl_setup_features() during the
pci probe function before the cxl_memdev is enumerated.
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Reviewed-by: Dan Williams <dan.j.williams@intel.com>
Reviewed-by: Li Ming <ming.li@zohomail.com>
Reviewed-by: Davidlohr Bueso <dave@stgolabs.net>
Tested-by: Shiju Jose <shiju.jose@huawei.com>
Link: https://patch.msgid.link/20250220194438.2281088-3-dave.jiang@intel.com
Signed-off-by: Dave Jiang <dave.jiang@intel.com>
