kernel/linux.git/drivers/gpu/drm/xe/xe_svm.c, branch linux-7.0.y

drm/xe: Disable garbage collector work item on SVM close

2026-03-30T12:52:14+00:00

When an SVM is closed, the garbage collector work item must be stopped synchronously and any future queuing must be prevented. Replace flush_work() with disable_work_sync() to ensure both conditions are met. Fixes: 63f6e480d115 ("drm/xe: Add SVM garbage collector") Cc: stable@vger.kernel.org Signed-off-by: Matthew Brost Reviewed-by: Thomas Hellström Link: https://patch.msgid.link/20260227015225.3081787-1-matthew.brost@intel.com (cherry picked from commit 2247feb9badca5a4774df9a437bfc44fba4f22de) Signed-off-by: Rodrigo Vivi

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

2026-02-22T01:09:51+00:00

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

treewide: Replace kmalloc with kmalloc_obj for non-scalar types

2026-02-21T09:02:28+00:00

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/pagemap: pass pagemap_addr by reference

2026-02-18T00:39:44+00:00

Passing a structure by value into a function is sometimes problematic, for a number of reasons. Of of these is a warning from the 32-bit arm compiler: drivers/gpu/drm/drm_gpusvm.c: In function '__drm_gpusvm_unmap_pages': drivers/gpu/drm/drm_gpusvm.c:1152:33: note: parameter passing for argument of type 'struct drm_pagemap_addr' changed in GCC 9.1 1152 | dpagemap->ops->device_unmap(dpagemap, | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 1153 | dev, *addr); | ~~~~~~~~~~~ This particular problem is harmless since we are not mixing compiler versions inside of the compiler. However, passing this by reference avoids the warning along with providing slightly better calling conventions as it avoids an extra copy on the stack. Fixes: 75af93b3f5d0 ("drm/pagemap, drm/xe: Support destination migration over interconnect") Fixes: 2df55d9e66a2 ("drm/xe: Support pcie p2p dma as a fast interconnect") Signed-off-by: Arnd Bergmann Reviewed-by: Thomas Hellström Signed-off-by: Thomas Hellström Link: https://patch.msgid.link/20260216134644.1025365-1-arnd@kernel.org Acked-by: Maarten Lankhorst (cherry picked from commit 95162db0208aee122d10ac1342fe97a1721cd258) Signed-off-by: Rodrigo Vivi

drm/xe: Validate preferred system memory placement in xe_svm_range_validate

2026-01-07T17:27:58+00:00

Ensure preferred system memory placement is checked in xe_svm_range_validate when dpagemap is NULL. Without this check, a prefetch to system memory may become a no-op because device memory is considered a valid placement. Cc: Thomas Hellström Fixes: 238dbc9d9f4a ("drm/xe: Use the vma attibute drm_pagemap to select where to migrate") Signed-off-by: Matthew Brost Reviewed-by: Himal Prasad Ghimiray Link: https://patch.msgid.link/20260106213443.1866797-1-matthew.brost@intel.com

drm/xe/svm: Serialize migration to device if racing

2025-12-23T09:00:49+00:00

Introduce an rw-semaphore to serialize migration to device if it's likely that migration races with another device migration of the same CPU address space range. This is a temporary fix to attempt to mitigate a livelock that might happen if many devices try to migrate a range at the same time, and it affects only devices using the xe driver. A longer term fix is probably improvements in the core mm migration layer. Suggested-by: Matthew Brost Signed-off-by: Thomas Hellström Reviewed-by: Matthew Brost Link: https://patch.msgid.link/20251219113320.183860-25-thomas.hellstrom@linux.intel.com

drm/pagemap, drm/xe: Support destination migration over interconnect

2025-12-23T09:00:49+00:00

Support destination migration over interconnect when migrating from device-private pages with the same dev_pagemap owner. Since we now also collect device-private pages to migrate, also abort migration if the range to migrate is already fully populated with pages from the desired pagemap. Finally return -EBUSY from drm_pagemap_populate_mm() if the migration can't be completed without first migrating all pages in the range to system. It is expected that the caller will perform that before retrying the call to drm_pagemap_populate_mm(). v3: - Fix a bug where the p2p dma-address was never used. - Postpone enabling destination interconnect migration, since xe devices require source interconnect migration to ensure the source L2 cache is flushed at migration time. - Update the drm_pagemap_migrate_to_devmem() interface to pass migration details. v4: - Define XE_INTERCONNECT_P2P unconditionally (CI) - Include a missing header (CI) v5: - Use page order increments where possible (Matt Brost). - Fix a negated value of can_migrate_same_pagemap. - Move removal of some dead code to a separate patch (Matt Brost). - Remove an unnecessary zdd get() and put() (Matt Brost). Signed-off-by: Thomas Hellström Reviewed-by: Matthew Brost Acked-by: Maarten Lankhorst # For merging through drm-xe. Link: https://patch.msgid.link/20251219113320.183860-23-thomas.hellstrom@linux.intel.com

drm/xe: Use drm_gpusvm_scan_mm()

2025-12-23T09:00:48+00:00

Use drm_gpusvm_scan_mm() to avoid unnecessarily calling into drm_pagemap_populate_mm(); v3: - New patch. Signed-off-by: Thomas Hellström Reviewed-by: Matthew Brost Reviewed-by: Himal Prasad Ghimiray Link: https://patch.msgid.link/20251219113320.183860-22-thomas.hellstrom@linux.intel.com

drm/pagemap, drm/xe: Clean up the use of the device-private page owner

2025-12-23T09:00:48+00:00

Use the dev_pagemap->owner field wherever possible, simplifying the code slightly. v3: New patch Signed-off-by: Thomas Hellström Reviewed-by: Himal Prasad Ghimiray Acked-by: Maarten Lankhorst # For merging through drm-xe. Link: https://patch.msgid.link/20251219113320.183860-20-thomas.hellstrom@linux.intel.com

drm/xe/svm: Document how xe keeps drm_pagemap references

2025-12-23T09:00:48+00:00

As an aid to understanding the lifetime of the drm_pagemaps used by the xe driver, document how the xe driver keeps the drm_pagemap references. v3: - Fix formatting (Matt Brost) Suggested-by: Matthew Brost Signed-off-by: Thomas Hellström Reviewed-by: Matthew Brost Link: https://patch.msgid.link/20251219113320.183860-19-thomas.hellstrom@linux.intel.com