kernel/linux.git/include/uapi/linux/cxl_mem.h, branch v6.12.80

cxl/mbox: Add Clear Log mailbox command

2024-04-30T15:48:10+00:00

Adding UAPI support for CXL r3.1 8.2.9.5.4 Clear Log command. This proposed patch will be useful for clearing and populating the Vendor debug log in certain scenarios, allowing for the aggregation of results over time. Signed-off-by: Srinivasulu Thanneeru Reviewed-by: Jonathan Cameron Link: https://lore.kernel.org/r/20240313071218.729-3-sthanneeru.opensrc@micron.com Signed-off-by: Dave Jiang

cxl/mbox: Add Get Log Capabilities and Get Supported Logs Sub-List commands

2024-04-30T15:48:10+00:00

Adding UAPI support for 1. CXL r3.1 8.2.9.5.3 Get Log Capabilities. 2. CXL r3.1 8.2.9.5.6 Get Supported Logs Sub-List. Signed-off-by: Srinivasulu Thanneeru Reviewed-by: Jonathan Cameron Link: https://lore.kernel.org/r/20240313071218.729-2-sthanneeru.opensrc@micron.com Signed-off-by: Dave Jiang

cxl: Add Support for Get Timestamp

2023-12-07T20:44:19+00:00

Add the call to the UAPI such that userspace may corelate the timestamps from the device log with system wall time, if, for example there's any sort of inaccuracy or skew in the device. Signed-off-by: Davidlohr Bueso Reviewed-by: Dave Jiang Reviewed-by: Jonathan Cameron Link: https://lore.kernel.org/r/20230829152014.15452-1-dave@stgolabs.net Signed-off-by: Dan Williams

cxl/mbox: Deprecate poison commands

2023-04-22T21:41:30+00:00

The CXL subsystem is adding formal mechanisms for managing device poison. Minimize the maintenance burden going forward, and maximize the investment in common tooling by deprecating direct user access to poison commands outside of CXL_MEM_RAW_COMMANDS debug scenarios. A new cxl_deprecated_commands[] list is created for querying which command ids defined in previous kernels are now deprecated. CXL Media and Poison Management commands, opcodes 0x43XX, defined in CXL 3.0 Spec, Table 8-93 are deprecated with one exception: Get Scan Media Capabilities. Keep Get Scan Media Capabilities as it simply provides information and has no impact on the device state. Effectively all of the commands defined in: commit 87815ee9d006 ("cxl/pci: Add media provisioning required commands") ...were defined prematurely and should have waited until the kernel implementation was decided. To my knowledge there are no shipping devices with poison support and no known tools that would regress with this change. Co-developed-by: Alison Schofield Signed-off-by: Alison Schofield Link: https://lore.kernel.org/r/652197e9bc8885e6448d989405b9e50ee9d6b0a6.1681838291.git.alison.schofield@intel.com Tested-by: Jonathan Cameron Signed-off-by: Dan Williams

cxl/mem: Fix UAPI command comment

2023-02-11T01:54:45+00:00

The command comment had grammatical errors. In an attempt to fix those it was noted that the comment and the query command were not in sync. Now that the query command returns excluded and device unsupported command information. Update the kdoc and fix the grammatical errors. [1] https://lore.kernel.org/all/63b4ec4e37cc1_5178e2941d@dwillia2-xfh.jf.intel.com.notmuch/ Reviewed-by: Jonathan Cameron Signed-off-by: Ira Weiny Link: https://lore.kernel.org/r/20221222-cxl-misc-v4-4-62f701c1cdd1@intel.com Signed-off-by: Dan Williams

cxl/uapi: Tag commands from cxl_query_cmd()

2023-02-11T01:54:45+00:00

It was pointed out that commands not supported by the device or excluded by the kernel were being returned in cxl_query_cmd().[1] While libcxl correctly handles failing commands, it is more efficient to not issue an invalid command in the first place. This can't be done without additional information being returned from cxl_query_cmd(). In addition, information about the availability of commands can be useful for debugging. Add flags to struct cxl_command_info which reflect if a command is enabled and/or exclusive to the kernel. [1] https://lore.kernel.org/all/63b4ec4e37cc1_5178e2941d@dwillia2-xfh.jf.intel.com.notmuch/ Suggested-by: Dan Williams Signed-off-by: Ira Weiny Link: https://lore.kernel.org/r/20221222-cxl-misc-v4-3-62f701c1cdd1@intel.com Signed-off-by: Dan Williams

cxl/uapi: Add warning on CXL command enum

2023-02-11T01:54:45+00:00

The CXL command enum is exported to user space and must maintain backwards compatibility. Add comment that new defines must be added to the end of the list. Suggested-by: Dan Williams Reviewed-by: Jonathan Cameron Reviewed-by: Dave Jiang Signed-off-by: Ira Weiny Link: https://lore.kernel.org/r/20221222-cxl-misc-v4-2-62f701c1cdd1@intel.com Signed-off-by: Dan Williams

cxl/mbox: Use type __u32 for mailbox payload sizes

2022-04-22T23:12:04+00:00

Payload sizes for mailbox commands are expected to be positive values coming from userspace. The documentation correctly describes these as always unsigned values. The mailbox and send structures that support the mailbox commands however, use __s32 types for the payloads. Replace __s32 with __u32 in the mailbox and send command structures and update usages. Kernel users of the interface already block all negative values and there is no known ability for userspace to have grown a dependency on submitting negative values to the kernel. The known user of the IOCTL, the CXL command line interface (cxl-cli) already enforces positive size values. A Smatch warning of a signedness uncovered this issue. Reported-by: kernel test robot Reported-by: Dan Carpenter Signed-off-by: Alison Schofield Link: https://lore.kernel.org/r/20220414051246.1244575-1-alison.schofield@intel.com Signed-off-by: Dan Williams

cxl/uapi: Fix defined but not used warnings

2021-09-07T18:39:01+00:00

Fix unused-const-variable warnings emitted by gcc when cxlmem.h is used by pretty much all files except pci.c Signed-off-by: Ben Widawsky Reviewed-by: Jonathan Cameron Link: https://lore.kernel.org/r/163072205652.2250120.16833548560832424468.stgit@dwillia2-desk3.amr.corp.intel.com Signed-off-by: Dan Williams

cxl/pci: Add media provisioning required commands

2021-06-15T06:54:53+00:00

Some of the commands have already been defined for the support of RAW commands (to be blocked). Unlike their usage in the RAW interface, when used through the supported interface, they will be coordinated and marshalled along with other commands being issued by userspace and the driver itself. That coordination will be added later. The list of commands was determined based on the learnings from libnvdimm and this list is provided directly from Dan. Recommended-by: Dan Williams Signed-off-by: Ben Widawsky Reviewed-by: Jonathan Cameron Link: https://lore.kernel.org/r/20210413140907.534404-1-ben.widawsky@intel.com Signed-off-by: Dan Williams