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| author | Matt Roper <matthew.d.roper@intel.com> | 2023-07-25 03:34:34 +0300 |
|---|---|---|
| committer | Rodrigo Vivi <rodrigo.vivi@intel.com> | 2023-12-21 19:37:54 +0300 |
| commit | 7a060d786cc1d75ffa04256826d805686b8f1043 (patch) | |
| tree | 287ef0d7ecacfbae6230b5ab50cc2c9b7e237e3f | |
| parent | 9700a1df0a5568a3eb8483de103d4078e273b36b (diff) | |
| download | linux-7a060d786cc1d75ffa04256826d805686b8f1043.tar.xz | |
drm/xe/mtl: Map PPGTT as CPU:WC
On MTL and beyond, the GPU performs non-coherent accesses to the PPGTT
page tables. These page tables should be mapped as CPU:WC.
Removes CAT errors triggered by xe_exec_basic@once-basic on MTL:
xe 0000:00:02.0: [drm:__xe_pt_bind_vma [xe]] Preparing bind, with range [1a0000...1a0fff) engine 0000000000000000.
xe 0000:00:02.0: [drm:xe_vm_dbg_print_entries [xe]] 1 entries to update
xe 0000:00:02.0: [drm:xe_vm_dbg_print_entries [xe]] 0: Update level 3 at (0 + 1) [0...8000000000) f:0
xe 0000:00:02.0: [drm] Engine memory cat error: guc_id=2
xe 0000:00:02.0: [drm] Engine memory cat error: guc_id=2
xe 0000:00:02.0: [drm] Timedout job: seqno=4294967169, guc_id=2, flags=0x4
v2:
- Rename to XE_BO_PAGETABLE to make it more clear that this BO is the
pagetable itself, rather than just being bound in the PPGTT. (Lucas)
Cc: Lucas De Marchi <lucas.demarchi@intel.com>
Reviewed-by: Lucas De Marchi <lucas.demarchi@intel.com>
Acked-by: Nirmoy Das <nirmoy.das@intel.com>
Link: https://lore.kernel.org/r/20230725003433.1992137-3-matthew.d.roper@intel.com
Signed-off-by: Matt Roper <matthew.d.roper@intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
| -rw-r--r-- | drivers/gpu/drm/xe/xe_bo.c | 16 | ||||
| -rw-r--r-- | drivers/gpu/drm/xe/xe_bo.h | 1 | ||||
| -rw-r--r-- | drivers/gpu/drm/xe/xe_pt.c | 3 |
3 files changed, 15 insertions, 5 deletions
diff --git a/drivers/gpu/drm/xe/xe_bo.c b/drivers/gpu/drm/xe/xe_bo.c index a78ac158e967..4b7678db88f3 100644 --- a/drivers/gpu/drm/xe/xe_bo.c +++ b/drivers/gpu/drm/xe/xe_bo.c @@ -301,6 +301,7 @@ static struct ttm_tt *xe_ttm_tt_create(struct ttm_buffer_object *ttm_bo, struct xe_device *xe = xe_bo_device(bo); struct xe_ttm_tt *tt; unsigned long extra_pages; + enum ttm_caching caching = ttm_cached; int err; tt = kzalloc(sizeof(*tt), GFP_KERNEL); @@ -314,10 +315,17 @@ static struct ttm_tt *xe_ttm_tt_create(struct ttm_buffer_object *ttm_bo, extra_pages = DIV_ROUND_UP(xe_device_ccs_bytes(xe, bo->size), PAGE_SIZE); - /* TODO: Select caching mode */ - err = ttm_tt_init(&tt->ttm, &bo->ttm, page_flags, - bo->flags & XE_BO_SCANOUT_BIT ? ttm_write_combined : ttm_cached, - extra_pages); + /* + * Display scanout is always non-coherent with the CPU cache. + * + * For Xe_LPG and beyond, PPGTT PTE lookups are also non-coherent and + * require a CPU:WC mapping. + */ + if (bo->flags & XE_BO_SCANOUT_BIT || + (xe->info.graphics_verx100 >= 1270 && bo->flags & XE_BO_PAGETABLE)) + caching = ttm_write_combined; + + err = ttm_tt_init(&tt->ttm, &bo->ttm, page_flags, caching, extra_pages); if (err) { kfree(tt); return NULL; diff --git a/drivers/gpu/drm/xe/xe_bo.h b/drivers/gpu/drm/xe/xe_bo.h index 3e98f3c0b85e..12a291925fa9 100644 --- a/drivers/gpu/drm/xe/xe_bo.h +++ b/drivers/gpu/drm/xe/xe_bo.h @@ -40,6 +40,7 @@ #define XE_BO_DEFER_BACKING BIT(9) #define XE_BO_SCANOUT_BIT BIT(10) #define XE_BO_FIXED_PLACEMENT_BIT BIT(11) +#define XE_BO_PAGETABLE BIT(12) /* this one is trigger internally only */ #define XE_BO_INTERNAL_TEST BIT(30) #define XE_BO_INTERNAL_64K BIT(31) diff --git a/drivers/gpu/drm/xe/xe_pt.c b/drivers/gpu/drm/xe/xe_pt.c index d2df51910010..48a87b50a040 100644 --- a/drivers/gpu/drm/xe/xe_pt.c +++ b/drivers/gpu/drm/xe/xe_pt.c @@ -221,7 +221,8 @@ struct xe_pt *xe_pt_create(struct xe_vm *vm, struct xe_tile *tile, XE_BO_CREATE_VRAM_IF_DGFX(tile) | XE_BO_CREATE_IGNORE_MIN_PAGE_SIZE_BIT | XE_BO_CREATE_PINNED_BIT | - XE_BO_CREATE_NO_RESV_EVICT); + XE_BO_CREATE_NO_RESV_EVICT | + XE_BO_PAGETABLE); if (IS_ERR(bo)) { err = PTR_ERR(bo); goto err_kfree; |