kernel/linux.git/drivers/gpu/drm/xe/xe_migrate.c, branch linux-7.1.y

drm/xe: Make decision to use Xe2-style blitter instructions a feature flag

2026-05-11T20:46:06+00:00

The blitter engines' MEM_COPY and MEM_SET instructions were added as part of the same hardware change that introduced service copy engines (i.e., BCS1-BCS8) which is why the driver checks for service copy engine presence when deciding whether to use these instructions or the older XY_* instructions. However when making this decision the driver should consider which engines are part of the hardware architecture, not which engines are present/usable on the current device. For graphics IP versions that architecturally include service copy engines (i.e., everything Xe2 and later, plus PVC's Xe_HPC) we should use MEM_SET and MEM_COPY even in if all of the service copy engines wind up getting fused off. I.e., we need to decide based on whether the platform's graphics descriptor contains these engines, rather than whether the usable engine mask contains them. This logic got broken when gt->info.__engine_mask was removed, although in practice that mistake has been harmless so far because there haven't been any hardware SKUs that fuse off all of the service copy engines yet. Replace the incorrect has_service_copy_support() function with a GT feature flag that tracks more accurately whether the new blitter instructions are usable. In addition to fixing incorrect logic if all service copies are fused off, the flag also makes it more obvious what the calling code is trying to do; previously it wasn't terribly obvious why "has service copy engines" was being used as the condition for using different instructions on all copy engine types. The new feature flag is named 'has_xe2_blt_instructions' because we expect this flag to be set for all Xe2 and later platforms (i.e., everything officially supported by the Xe driver). Technically there's also one Xe1-era platform (PVC) that supports these engines/instructions and will set this flag, but this still seems to be the most clear and understandable name for the flag. Fixes: 61549a2ee594 ("drm/xe: Drop __engine_mask") Cc: Balasubramani Vivekanandan Reviewed-by: Balasubramani Vivekanandan Link: https://patch.msgid.link/20260507-xe2_copy-v1-1-26506381b821@intel.com Signed-off-by: Matt Roper (cherry picked from commit 09b399842907565a64e351fb22da790b4c673ffb) Signed-off-by: Rodrigo Vivi

drm/xe/vf: Use drm mm instead of drm sa for CCS read/write

2026-04-29T16:51:19+00:00

The suballocator algorithm tracks a hole cursor at the last allocation and tries to allocate after it. This is optimized for fence-ordered progress, where older allocations are expected to become reusable first. In fence-enabled mode, that ordering assumption holds. In fence-disabled mode, allocations may be freed in arbitrary order, so limiting allocation to the current hole window can miss valid free space and fail allocations despite sufficient total space. Use DRM memory manager instead of sub-allocator to get rid of this issue as CCS read/write operations do not use fences. Fixes: 864690cf4dd6 ("drm/xe/vf: Attach and detach CCS copy commands with BO") Signed-off-by: Satyanarayana K V P Cc: Matthew Brost Cc: Thomas Hellström Cc: Maarten Lankhorst Cc: Michal Wajdeczko Reviewed-by: Matthew Brost Signed-off-by: Matthew Brost Link: https://patch.msgid.link/20260408110145.1639937-6-satyanarayana.k.v.p@intel.com (cherry picked from commit 6c84b493012aeb05dec29c709377bf0e17ac6815) Signed-off-by: Rodrigo Vivi

Merge drm/drm-next into drm-xe-next

2026-03-12T14:23:23+00:00

Backmerging to bring in 7.00-rc3. Important ahead GPU SVM merging THP support. Signed-off-by: Matthew Brost

drm/xe: add xe_migrate_resolve wrapper and is_vram_resolve support

2026-03-12T09:37:40+00:00

Introduce an internal __xe_migrate_copy(..., is_vram_resolve) path and expose a small wrapper xe_migrate_resolve() that calls it with is_vram_resolve=true. For resolve/decompression operations we must ensure the copy code uses the compression PAT index when appropriate; this change centralizes that behavior and allows callers to schedule a resolve (decompress) operation via the migrate API. v3: Fix kernel-doc warnings v2: (Matt) - Simplify xe_migrate_resolve(), use single BO/resource; remove copy_only_ccs argument as it's always false. Cc: Matthew Brost Cc: Matthew Auld Reviewed-by: Matthew Brost Signed-off-by: Nitin Gote Signed-off-by: Matthew Auld Link: https://patch.msgid.link/20260304123758.3050386-7-nitin.r.gote@intel.com

drm/xe/migrate: Refactor xe_migrate_prepare_vm()

2026-03-06T23:13:38+00:00

Currently xe_migrate_prepare_vm() does three things. 1. Allocates pt_bo for migrate context. 2. Initializes pt_bo with actual pte details. 3. Initializes sa_manager for migrate context. Split these implementations in their own functions for better maintainability. Signed-off-by: Raag Jadav Reviewed-by: Matthew Brost Link: https://patch.msgid.link/20260303101913.3576481-1-raag.jadav@intel.com Signed-off-by: Matt Roper

Merge tag 'drm-xe-next-2026-03-02' of https://gitlab.freedesktop.org/drm/xe/kernel into drm-next

2026-03-03T00:37:29+00:00

UAPI Changes: - restrict multi-lrc to VCS/VECS engines (Xin Wang) - Introduce a flag to disallow vm overcommit in fault mode (Thomas) - update used tracking kernel-doc (Auld, Fixes) - Some bind queue fixes (Auld, Fixes) Cross-subsystem Changes: - Split drm_suballoc_new() into SA alloc and init helpers (Satya, Fixes) - pass pagemap_addr by reference (Arnd, Fixes) - Revert "drm/pagemap: Disable device-to-device migration" (Thomas) - Fix unbalanced unlock in drm_gpusvm_scan_mm (Maciej, Fixes) - Small GPUSVM fixes (Brost, Fixes) - Fix xe SVM configs (Thomas, Fixes) Core Changes: - Fix a hmm_range_fault() livelock / starvation problem (Thomas, Fixes) Driver Changes: - Fix leak on xa_store failure (Shuicheng, Fixes) - Correct implementation of Wa_16025250150 (Roper, Fixes) - Refactor context init into xe_lrc_ctx_init (Raag) - Fix GSC proxy cleanup on early initialization failure (Zhanjun) - Fix exec queue creation during post-migration recovery (Tomasz, Fixes) - Apply windower hardware filtering setting on Xe3 and Xe3p (Roper) - Free ctx_restore_mid_bb in release (Shuicheng, Fixes) - Drop stale MCR steering TODO comment (Roper) - dGPU memory optimizations (Brost) - Do not preempt fence signaling CS instructions (Brost, Fixes) - Revert "drm/xe/compat: Remove unused i915_reg.h from compat header" (Uma) - Don't expose display modparam if no display support (Wajdeczko) - Some VRAM flag improvements (Wajdeczko) - Misc fix for xe_guc_ct.c (Shuicheng, Fixes) - Remove unused i915_reg.h from compat header (Uma) - Workaround cleanup & simplification (Roper) - Add prefetch pagefault support for Xe3p (Varun) - Fix fs_reclaim deadlock caused by CCS save/restore (Satya, Fixes) - Cleanup partially initialized sync on parse failure (Shuicheng, Fixes) - Allow to change VFs VRAM quota using sysfs (Michal) - Increase GuC log sizes in debug builds (Tomasz) - Wa_18041344222 changes (Harish) - Add Wa_14026781792 (Niton) - Add debugfs facility to catch RTP mistakes (Roper) - Convert GT stats to per-cpu counters (Brost) - Prevent unintended VRAM channel creation (Karthik) - Privatize struct xe_ggtt (Maarten) - remove unnecessary struct dram_info forward declaration (Jani) - pagefault refactors (Brost) - Apply Wa_14024997852 (Arvind) - Redirect faults to dummy page for wedged device (Raag, Fixes) - Force EXEC_QUEUE_FLAG_KERNEL for kernel internal VMs (Piotr) - Stop applying Wa_16018737384 from Xe3 onward (Roper) - Add new XeCore fuse registers to VF runtime regs (Roper) - Update xe_device_declare_wedged() error log (Raag) - Make xe_modparam.force_vram_bar_size signed (Shuicheng, Fixes) - Avoid reading media version when media GT is disabled (Piotr, Fixes) - Fix handling of Wa_14019988906 & Wa_14019877138 (Roper, Fixes) - Basic enabling patches for Xe3p_LPG and NVL-P (Gustavo, Roper, Shekhar) - Avoid double-adjust in 64-bit reads (Shuicheng, Fixes) - Allow VF to initialize MCR tables (Wajdeczko) - Add Wa_14025883347 for GuC DMA failure on reset (Anirban) - Add bounds check on pat_index to prevent OOB kernel read in madvise (Jia, Fixes) - Fix the address range assert in ggtt_get_pte helper (Winiarski) - XeCore fuse register changes (Roper) - Add more info to powergate_info debugfs (Vinay) - Separate out GuC RC code (Vinay) - Fix g2g_test_array indexing (Pallavi) - Mutual exclusivity between CCS-mode and PF (Nareshkumar, Fixes) - Some more _types.h cleanups (Wajdeczko) - Fix sysfs initialization (Wajdeczko, Fixes) - Drop unnecessary goto in xe_device_create (Roper) - Disable D3Cold for BMG only on specific platforms (Karthik, Fixes) - Add sriov.admin_only_pf attribute (Wajdeczko) - replace old wq(s), add WQ_PERCPU to alloc_workqueue (Marco) - Make MMIO communication more robust (Wajdeczko) - Fix warning of kerneldoc (Shuicheng, Fixes) - Fix topology query pointer advance (Shuicheng, Fixes) - use entry_dump callbacks for xe2+ PAT dumps (Xin Wang) - Fix kernel-doc warning in GuC scheduler ABI header (Chaitanya, Fixes) - Fix CFI violation in debugfs access (Daniele, Fixes) - Apply WA_16028005424 to Media (Balasubramani) - Fix typo in function kernel-doc (Wajdeczko) - Protect priority against concurrent access (Niranjana) - Fix nvm aux resource cleanup (Shuicheng, Fixes) - Fix is_bound() pci_dev lifetime (Shuicheng, Fixes) - Use CLASS() for forcewake in xe_gt_enable_comp_1wcoh (Shuicheng) - Reset VF GuC state on fini (Wajdeczko) - Move _THIS_IP_ usage from xe_vm_create() to dedicated function (Nathan Chancellor, Fixes) - Unregister drm device on probe error (Shuicheng, Fixes) - Disable DCC on PTL (Vinay, Fixes) - Fix Wa_18022495364 (Tvrtko, Fixes) - Skip address copy for sync-only execs (Shuicheng, Fixes) - derive mem copy capability from graphics version (Nitin, Fixes) - Use DRM_BUDDY_CONTIGUOUS_ALLOCATION for contiguous allocations (Sanjay) - Context based TLB invalidations (Brost) - Enable multi_queue on xe3p_xpc (Brost, Niranjana) - Remove check for gt in xe_query (Nakshtra) - Reduce LRC timestamp stuck message on VFs to notice (Brost, Fixes) Signed-off-by: Dave Airlie From: Matthew Brost Link: https://patch.msgid.link/aaYR5G2MHjOEMXPW@lstrano-desk.jf.intel.com

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/xe/vf: Fix fs_reclaim warning with CCS save/restore BB allocation

2026-02-20T18:54:03+00:00

CCS save/restore batch buffers are attached during BO allocation and detached during BO teardown. The shrinker triggers xe_bo_move(), which is used for both allocation and deletion paths. When BO allocation and shrinking occur concurrently, a circular locking dependency involving fs_reclaim and swap_guard can occur, leading to a deadlock such as: *===============================================================* * WARNING: possible circular locking dependency detected * *---------------------------------------------------------------* * * * CPU0 CPU1 * * ---- ---- * * lock(fs_reclaim); * * lock(&sa_manager->swap_guard); * * lock(fs_reclaim); * * lock(&sa_manager->swap_guard); * * * * *** DEADLOCK *** * *===============================================================* To avoid this, the BB pointer and SA are allocated using xe_bb_alloc() before taking lock and SA is initialized using xe_bb_init() preventing reclaim from being invoked in this context. Fixes: 864690cf4dd62 ("drm/xe/vf: Attach and detach CCS copy commands with BO") Signed-off-by: Satyanarayana K V P Cc: Matthew Brost Cc: Michal Wajdeczko Cc: Matthew Auld Cc: Thomas Hellström Cc: Maarten Lankhorst Reviewed-by: Matthew Brost Signed-off-by: Matthew Brost Link: https://patch.msgid.link/20260220055519.2485681-7-satyanarayana.k.v.p@intel.com

drm/xe: Fix kerneldoc for xe_migrate_exec_queue

2026-02-05T13:03:41+00:00

Correct the function name in the kerneldoc. It is for below warning: "Warning: drivers/gpu/drm/xe/xe_migrate.c:1262 expecting prototype for xe_get_migrate_exec_queue(). Prototype was for xe_migrate_exec_queue() instead" Fixes: 916ee4704a865 ("drm/xe/vf: Register CCS read/write contexts with Guc") Reviewed-by: Michal Wajdeczko Signed-off-by: Shuicheng Lin Signed-off-by: Michal Wajdeczko Link: https://patch.msgid.link/20260129233834.419977-6-shuicheng.lin@intel.com (cherry picked from commit 9fd8da717934f05125b9ba6782622c459a368dc0) Signed-off-by: Rodrigo Vivi