drm/xe: Return 2MB page size for compact 64k PTEs

Compact 64k PTEs are only intended to be used within a single VMA which
covers the entire 2MB range of the compact 64k PTEs. Add
XE_VMA_PTE_COMPACT VMA flag to indicate compact 64k PTEs are used and
update xe_vma_max_pte_size to return at least 2MB if set.

v2: Include missing changes

Fixes: 8f33b4f054fc ("drm/xe: Avoid doing rebinds")
Fixes: c47794bdd63d ("drm/xe: Set max pte size when skipping rebinds")
Reported-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
Closes: https://gitlab.freedesktop.org/drm/xe/kernel/-/issues/758
Signed-off-by: Matthew Brost <matthew.brost@intel.com>
Reviewed-by: Thomas Hellström <thomas.hellstrom@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240219211942.3633795-4-matthew.brost@intel.com

diff --git a/drivers/gpu/drm/xe/xe_pt.c b/drivers/gpu/drm/xe/xe_pt.c
index 46cea37..7f54bc3 100644 (file)
--- a/drivers/gpu/drm/xe/xe_pt.c
+++ b/drivers/gpu/drm/xe/xe_pt.c
@@ -547,13 +547,16 @@ xe_pt_stage_bind_entry(struct xe_ptw *parent, pgoff_t offset,
                *child = &xe_child->base;
 
                /*
-                * Prefer the compact pagetable layout for L0 if possible.
+                * Prefer the compact pagetable layout for L0 if possible. Only
+                * possible if VMA covers entire 2MB region as compact 64k and
+                * 4k pages cannot be mixed within a 2MB region.
                 * TODO: Suballocate the pt bo to avoid wasting a lot of
                 * memory.
                 */
                if (GRAPHICS_VERx100(tile_to_xe(xe_walk->tile)) >= 1250 && level == 1 &&
                    covers && xe_pt_scan_64K(addr, next, xe_walk)) {
                        walk->shifts = xe_compact_pt_shifts;
+                       xe_walk->vma->gpuva.flags |= XE_VMA_PTE_COMPACT;
                        flags |= XE_PDE_64K;
                        xe_child->is_compact = true;
                }

diff --git a/drivers/gpu/drm/xe/xe_vm.c b/drivers/gpu/drm/xe/xe_vm.c
index 7781290..23a44ef 100644 (file)
--- a/drivers/gpu/drm/xe/xe_vm.c
+++ b/drivers/gpu/drm/xe/xe_vm.c
@@ -2190,7 +2190,7 @@ static u64 xe_vma_max_pte_size(struct xe_vma *vma)
 {
        if (vma->gpuva.flags & XE_VMA_PTE_1G)
                return SZ_1G;
-       else if (vma->gpuva.flags & XE_VMA_PTE_2M)
+       else if (vma->gpuva.flags & (XE_VMA_PTE_2M | XE_VMA_PTE_COMPACT))
                return SZ_2M;
        else if (vma->gpuva.flags & XE_VMA_PTE_64K)
                return SZ_64K;

diff --git a/drivers/gpu/drm/xe/xe_vm_types.h b/drivers/gpu/drm/xe/xe_vm_types.h
index 91800ce..a603cc2 100644 (file)
--- a/drivers/gpu/drm/xe/xe_vm_types.h
+++ b/drivers/gpu/drm/xe/xe_vm_types.h
@@ -30,6 +30,7 @@ struct xe_vm;
 #define XE_VMA_PTE_2M          (DRM_GPUVA_USERBITS << 6)
 #define XE_VMA_PTE_1G          (DRM_GPUVA_USERBITS << 7)
 #define XE_VMA_PTE_64K         (DRM_GPUVA_USERBITS << 8)
+#define XE_VMA_PTE_COMPACT     (DRM_GPUVA_USERBITS << 9)
 
 /** struct xe_userptr - User pointer */
 struct xe_userptr {