Linaro-mm-sig April 2026

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213 discussions

by Alex Johnson

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4 weeks

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by Alex Johnson

4 weeks

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4 weeks, 1 day

[PATCH 0/8] drm/imagination: Job submission fixes and cleanup

by Alessio Belle

The first two commits fix rare bugs and should be backported to stable branches. The rest is an attempt to cleanup and document the code to make it a bit easier to understand. Signed-off-by: Alessio Belle <alessio.belle(a)imgtec.com> --- Alessio Belle (8): drm/imagination: Count paired job fence as dependency in prepare_job() drm/imagination: Fit paired fragment job in the correct CCCB drm/imagination: Skip check on paired job fence during job submission drm/imagination: Rename pvr_queue_fence_is_ufo_backed() to reflect usage drm/imagination: Rename fence returned by pvr_queue_job_arm() drm/imagination: Move repeated job fence check to its own function drm/imagination: Update check to skip prepare_job() for fragment jobs drm/imagination: Minor improvements to job submission code documentation drivers/gpu/drm/imagination/pvr_job.c | 8 +- drivers/gpu/drm/imagination/pvr_queue.c | 154 +++++++++++++-------- drivers/gpu/drm/imagination/pvr_queue.h | 2 +- .../gpu/drm/imagination/pvr_rogue_fwif_shared.h | 10 +- drivers/gpu/drm/imagination/pvr_sync.c | 8 +- drivers/gpu/drm/imagination/pvr_sync.h | 2 +- 6 files changed, 110 insertions(+), 74 deletions(-) --- base-commit: 3bce3fdd1ff2ba242f76ab66659fff27207299f1 change-id: 20260330-job-submission-fixes-cleanup-83e01196c3e9 Best regards, -- Alessio Belle <alessio.belle(a)imgtec.com>

4 weeks, 1 day

[PATCH 0/5] Replace the dmabuf custom test framework with kunit

by Jason Gunthorpe

Using kunit to write tests for new work on dmabuf is coming up: https://lore.kernel.org/all/26-v1-b5cab63049c0+191af-dmabuf_map_type_jgg@nv… Replace the custom test framework with kunit to avoid maintaining two concurrent test frameworks. The conversion minimizes code changes and uses simple pattern-oriented reworks to reduce the chance of breaking any tests. Aside from adding the kunit_test_suite() boilerplate, the conversion follows a number of patterns: Test failures without cleanup. For example: if (!ptr) return -ENOMEM; Becomes: KUNIT_ASSERT_NOT_NULL(test, ptr); In kunit ASSERT longjumps out of the test. Check for error, fail and cleanup: if (err) { pr_err("msg\n"); goto cleanup; } Becomes: if (err) { KUNIT_FAIL(test, "msg"); goto cleanup; } Preserve the existing failure messages and cleanup code. Cases where the test returns err but prints no message: if (err) goto cleanup; Becomes: if (err) { KUNIT_FAIL(test, "msg"); goto cleanup; } Use KUNIT_FAIL to retain the 'cleanup on err' behavior. Overall, the conversion is straightforward. The result can be run with kunit.py: $ tools/testing/kunit/kunit.py run --build_dir build_kunit_x86_64 --arch x86_64 --kunitconfig ./drivers/dma-buf/.kunitconfig [20:37:23] Configuring KUnit Kernel ... [20:37:23] Building KUnit Kernel ... Populating config with: $ make ARCH=x86_64 O=build_kunit_x86_64 olddefconfig Building with: $ make all compile_commands.json scripts_gdb ARCH=x86_64 O=build_kunit_x86_64 --jobs=20 [20:37:29] Starting KUnit Kernel (1/1)... [20:37:29] ============================================================ Running tests with: $ qemu-system-x86_64 -nodefaults -m 1024 -kernel build_kunit_x86_64/arch/x86/boot/bzImage -append 'kunit.enable=1 console=ttyS0 kunit_shutdown=reboot' -no-reboot -nographic -accel kvm -accel hvf -accel tcg -serial stdio -bios qboot.rom [20:37:30] ================ dma-buf-resv (5 subtests) ================= [20:37:30] [PASSED] test_sanitycheck [20:37:30] ===================== test_signaling ====================== [20:37:30] [PASSED] kernel [20:37:30] [PASSED] write [20:37:30] [PASSED] read [20:37:30] [PASSED] bookkeep [20:37:30] ================= [PASSED] test_signaling ================== ... [20:37:35] Testing complete. Ran 50 tests: passed: 49, skipped: 1 [20:37:35] Elapsed time: 12.635s total, 0.001s configuring, 6.551s building, 6.017s running One test that requires two CPUs is skipped since the default VM has a single CPU and cannot run the test. All other usual ways to run kunit work as well, and all tests are placed in a module to provide more options for how they are run. AI was used to do the large scale semantic search and replaces described above, then everything was hand checked. AI also deduced the issue with test_race_signal_callback() in a couple of seconds from the kunit crash (!!), again was hand checked though I am not so familiar with this test to be fully certain this is the best answer. Jason Gunthorpe (5): dma-buf: Change st-dma-resv.c to use kunit dma-buf: Change st-dma-fence.c to use kunit dma-buf: Change st-dma-fence-unwrap.c to use kunit dma-buf: Change st-dma-fence-chain.c to use kunit dma-buf: Remove the old selftest drivers/dma-buf/.kunitconfig | 2 + drivers/dma-buf/Kconfig | 11 +- drivers/dma-buf/Makefile | 5 +- drivers/dma-buf/selftest.c | 167 --------------- drivers/dma-buf/selftest.h | 30 --- drivers/dma-buf/selftests.h | 16 -- drivers/dma-buf/st-dma-fence-chain.c | 217 +++++++++---------- drivers/dma-buf/st-dma-fence-unwrap.c | 290 +++++++++++--------------- drivers/dma-buf/st-dma-fence.c | 200 ++++++++---------- drivers/dma-buf/st-dma-resv.c | 145 +++++++------ drivers/gpu/drm/i915/Kconfig.debug | 2 +- 11 files changed, 394 insertions(+), 691 deletions(-) create mode 100644 drivers/dma-buf/.kunitconfig delete mode 100644 drivers/dma-buf/selftest.c delete mode 100644 drivers/dma-buf/selftest.h delete mode 100644 drivers/dma-buf/selftests.h base-commit: 41dae5ac5e157b0bb260f381eb3df2f4a4610205 -- 2.43.0

1 month

[PATCH 15901/15901] drm/vmwgfx: fix NULL pointer dereference in vmw_validation_bo_fence()

by popov.nkv＠gmail.com

From: Vladimir Popov <popov.nkv(a)gmail.com> If vmw_execbuf_fence_commands() call fails in vmw_kms_helper_validation_finish(), it sets *p_fence = NULL. If ctx->bo_list is not empty, the caller, vmw_kms_helper_validation_finish(), passes the fence through a chain of functions to dma_fence_is_array(), which causes a NULL pointer dereference in dma_fence_is_array(): vmw_kms_helper_validation_finish() // pass NULL fence vmw_validation_done() vmw_validation_bo_fence() ttm_eu_fence_buffer_objects() // pass NULL fence dma_resv_add_fence() dma_fence_is_container() dma_fence_is_array() // NULL deref Fix this by adding a NULL check in vmw_validation_bo_fence(): if the fence is NULL, fall back to ttm_eu_backoff_reservation()to safely release the buffer object reservations without attempting to add a NULL fence to dma_resv. This is safe because when fence is NULL, vmw_fallback_wait() has already been called inside vmw_execbuf_fence_commands() to synchronize the GPU. Found by Linux Verification Center (linuxtesting.org) with SVACE. Fixes: 038ecc503236 ("drm/vmwgfx: Add a validation module v2") Cc: stable(a)vger.kernel.org Signed-off-by: Vladimir Popov <popov.nkv(a)gmail.com> --- drivers/gpu/drm/vmwgfx/vmwgfx_validation.h | 13 ++++++++++--- 1 file changed, 10 insertions(+), 3 deletions(-) diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_validation.h b/drivers/gpu/drm/vmwgfx/vmwgfx_validation.h index 353d837907d8..fc04555ca505 100644 --- a/drivers/gpu/drm/vmwgfx/vmwgfx_validation.h +++ b/drivers/gpu/drm/vmwgfx/vmwgfx_validation.h @@ -127,16 +127,23 @@ vmw_validation_bo_reserve(struct vmw_validation_context *ctx, * vmw_validation_bo_fence - Unreserve and fence buffer objects registered * with a validation context * @ctx: The validation context + * @fence: Fence with which to fence all buffer objects taking part in the + * command submission. * * This function unreserves the buffer objects previously reserved using - * vmw_validation_bo_reserve, and fences them with a fence object. + * vmw_validation_bo_reserve, and fences them with a fence object if the + * given fence object is not NULL. */ static inline void vmw_validation_bo_fence(struct vmw_validation_context *ctx, struct vmw_fence_obj *fence) { - ttm_eu_fence_buffer_objects(&ctx->ticket, &ctx->bo_list, - (void *) fence); + /* fence is able to be NULL if vmw_execbuf_fence_commands() fails */ + if (fence) + ttm_eu_fence_buffer_objects(&ctx->ticket, &ctx->bo_list, + (void *)fence); + else + ttm_eu_backoff_reservation(&ctx->ticket, &ctx->bo_list); } /** -- 2.43.0

1 month

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1 month

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Linaro-mm-sig April 2026