Merge tag 'drm-intel-gt-next-2025-11-14' of https://gitlab.freedesktop.org/drm/i915/kernel into drm-next

Driver Changes:

Fixes/improvements/new stuff:

- Avoid lock inversion when pinning to GGTT on CHV/BXT+VTD (Janusz Krzysztofik)
- Use standard API for seqcount read in TLB invalidation [gt] (Andi Shyti)

Miscellaneous:

- Wait longer for threads in migrate selftest on CHV/BXT+VTD (Janusz Krzysztofik)
- Wait for page_sizes_gtt in gtt selftest on CHV/BXT+VTD (Janusz Krzysztofik)

Signed-off-by: Dave Airlie <[e-mail]>
From: Tvrtko Ursulin <[e-mail]>
Link: https://patch.msgid.link/aRdXOAKlTVX_b0en@linux

drivers/gpu/drm/i915/gt/intel_tlb.h

···
 
 static inline u32 intel_gt_tlb_seqno(const struct intel_gt *gt)
 {
-	return seqprop_sequence(&gt->tlb.seqno);
+	return raw_read_seqcount(&gt->tlb.seqno);
 }
 
 static inline u32 intel_gt_next_invalidate_tlb_full(const struct intel_gt *gt)

drivers/gpu/drm/i915/gt/selftest_migrate.c

···
 		thread[i].tsk = tsk;
 	}
 
-	msleep(10 * n_cpus); /* start all threads before we kthread_stop() */
+	/*
+	 * Start all threads before we kthread_stop().
+	 * In CHV / BXT+VTD environments, where VMA pinning is committed
+	 * asynchronously, empirically determined 100ms delay is needed
+	 * to avoid stopping threads that may still wait for completion of
+	 * intel_ggtt_bind_vma and fail with -ERESTARTSYS when interrupted.
+	 */
+	msleep((intel_vm_no_concurrent_access_wa(migrate->context->vm->i915) ? 100 : 10) * n_cpus);
 
 	for (i = 0; i < n_cpus; ++i) {
 		struct task_struct *tsk = thread[i].tsk;

drivers/gpu/drm/i915/i915_vma.c

···
 err_vma_res:
 	i915_vma_resource_free(vma_res);
 err_fence:
-	if (work)
-		dma_fence_work_commit_imm(&work->base);
+	if (work) {
+		/*
+		 * When pinning VMA to GGTT on CHV or BXT with VTD enabled,
+		 * commit VMA binding asynchronously to avoid risk of lock
+		 * inversion among reservation_ww locks held here and
+		 * cpu_hotplug_lock acquired from stop_machine(), which we
+		 * wrap around GGTT updates when running in those environments.
+		 */
+		if (i915_vma_is_ggtt(vma) &&
+		    intel_vm_no_concurrent_access_wa(vma->vm->i915))
+			dma_fence_work_commit(&work->base);
+		else
+			dma_fence_work_commit_imm(&work->base);
+	}
 err_rpm:
 	intel_runtime_pm_put(&vma->vm->i915->runtime_pm, wakeref);
 

drivers/gpu/drm/i915/selftests/i915_gem_gtt.c

···
 		goto err_put;
 	}
 
+	/* make sure page_sizes_gtt has been populated before use */
+	if (i915_is_ggtt(vm) && intel_vm_no_concurrent_access_wa(vm->i915))
+		i915_vma_wait_for_bind(vma);
+
 	expected_vma_size = round_up(size, 1 << (ffs(vma->resource->page_sizes_gtt) - 1));
 	expected_node_size = expected_vma_size;