kernel/drivers/gpu/drm/xe/xe_oa.c, branch master

drm/xe/oa: Allow reading after disabling OA stream

2026-03-19T13:22:58Z

Some OA data might be present in the OA buffer when OA stream is disabled. Allow UMD's to retrieve this data, so that all data till the point when OA stream is disabled can be retrieved. v2: Update tail pointer after disable (Umesh) Fixes: efb315d0a013 ("drm/xe/oa/uapi: Read file_operation") Cc: stable@vger.kernel.org Signed-off-by: Ashutosh Dixit Reviewed-by: Umesh Nerlige Ramappa Link: https://patch.msgid.link/20260313053630.3176100-1-ashutosh.dixit@intel.com (cherry picked from commit 4ff57c5e8dbba23b5457be12f9709d5c016da16e) Signed-off-by: Thomas Hellström

Convert more 'alloc_obj' cases to default GFP_KERNEL arguments

2026-02-22T04:03:00Z

This converts some of the visually simpler cases that have been split over multiple lines. I only did the ones that are easy to verify the resulting diff by having just that final GFP_KERNEL argument on the next line. Somebody should probably do a proper coccinelle script for this, but for me the trivial script actually resulted in an assertion failure in the middle of the script. I probably had made it a bit _too_ trivial. So after fighting that far a while I decided to just do some of the syntactically simpler cases with variations of the previous 'sed' scripts. The more syntactically complex multi-line cases would mostly really want whitespace cleanup anyway. Signed-off-by: Linus Torvalds

Convert 'alloc_obj' family to use the new default GFP_KERNEL argument

2026-02-22T01:09:51Z

This was done entirely with mindless brute force, using git grep -l '\

treewide: Replace kmalloc with kmalloc_obj for non-scalar types

2026-02-21T09:02:28Z

This is the result of running the Coccinelle script from scripts/coccinelle/api/kmalloc_objs.cocci. The script is designed to avoid scalar types (which need careful case-by-case checking), and instead replace kmalloc-family calls that allocate struct or union object instances: Single allocations: kmalloc(sizeof(TYPE), ...) are replaced with: kmalloc_obj(TYPE, ...) Array allocations: kmalloc_array(COUNT, sizeof(TYPE), ...) are replaced with: kmalloc_objs(TYPE, COUNT, ...) Flex array allocations: kmalloc(struct_size(PTR, FAM, COUNT), ...) are replaced with: kmalloc_flex(*PTR, FAM, COUNT, ...) (where TYPE may also be *VAR) The resulting allocations no longer return "void *", instead returning "TYPE *". Signed-off-by: Kees Cook

drm/xe/oa: Disallow 0 OA property values

2025-12-18T03:47:28Z

An OA property value of 0 is invalid and will cause a NPD. Reported-by: Peter Senna Tschudin Closes: https://gitlab.freedesktop.org/drm/xe/kernel/-/issues/6452 Fixes: cc4e6994d5a2 ("drm/xe/oa: Move functions up so they can be reused for config ioctl") Cc: stable@vger.kernel.org Signed-off-by: Ashutosh Dixit Reviewed-by: Harish Chegondi Link: https://patch.msgid.link/20251212061850.1565459-3-ashutosh.dixit@intel.com

drm/xe/oa: Move default oa unit assignment earlier during stream open

2025-12-18T03:47:28Z

De-referencing param.oa_unit, when an OA unit id is not provided during stream open, results in NPD below. Oops: general protection fault, probably for non-canonical address... KASAN: null-ptr-deref in range... RIP: 0010:xe_oa_stream_open_ioctl+0x169/0x38a0 xe_observation_ioctl+0x19f/0x270 drm_ioctl_kernel+0x1f4/0x410 Fix this by moving default oa unit assignment before the dereference. Reported-by: Peter Senna Tschudin Closes: https://gitlab.freedesktop.org/drm/xe/kernel/-/issues/6840 Fixes: c7e269aa565f ("drm/xe/oa: Allow exec_queue's to be specified only for OAG OA unit") Signed-off-by: Ashutosh Dixit Reviewed-by: Harish Chegondi Link: https://patch.msgid.link/20251212061850.1565459-2-ashutosh.dixit@intel.com

drm/xe/oa: Always set OAG_OAGLBCTXCTRL_COUNTER_RESUME

2025-12-17T01:08:28Z

Reports can be written out to the OA buffer using ways other than periodic sampling. These include mmio trigger and context switches. To support these use cases, when periodic sampling is not enabled, OAG_OAGLBCTXCTRL_COUNTER_RESUME must be set. Fixes: 1db9a9dc90ae ("drm/xe/oa: OA stream initialization (OAG)") Signed-off-by: Ashutosh Dixit Reviewed-by: Umesh Nerlige Ramappa Link: https://patch.msgid.link/20251205212613.826224-4-ashutosh.dixit@intel.com

drm/xe/oa/uapi: Expose MERT OA unit

2025-12-17T01:08:24Z

A MERT OA unit is available in the SoC on some platforms. Add support for this OA unit and expose it to userspace. The MERT OA unit does not have any HW engines attached, but is otherwise similar to an OAM unit. Signed-off-by: Lucas De Marchi Reviewed-by: Umesh Nerlige Ramappa Signed-off-by: Ashutosh Dixit Link: https://patch.msgid.link/20251205212613.826224-2-ashutosh.dixit@intel.com

drm/xe/oa: Limit num_syncs to prevent oversized allocations

2025-12-15T21:33:58Z

The OA open parameters did not validate num_syncs, allowing userspace to pass arbitrarily large values, potentially leading to excessive allocations. Add check to ensure that num_syncs does not exceed DRM_XE_MAX_SYNCS, returning -EINVAL when the limit is violated. v2: use XE_IOCTL_DBG() and drop duplicated check. (Ashutosh) Fixes: c8507a25cebd ("drm/xe/oa/uapi: Define and parse OA sync properties") Cc: Matthew Brost Cc: Ashutosh Dixit Signed-off-by: Shuicheng Lin Reviewed-by: Ashutosh Dixit Signed-off-by: Matthew Brost Link: https://patch.msgid.link/20251205234715.2476561-6-shuicheng.lin@intel.com

drm/xe/rtp: Whitelist OAM MMIO trigger registers

2025-12-04T21:37:41Z

Whitelist OAM registers to enable userspace to execute MMIO triggers on OAM units. Signed-off-by: Ashutosh Dixit Reviewed-by: Umesh Nerlige Ramappa Link: https://patch.msgid.link/20251202025115.373546-6-ashutosh.dixit@intel.com