From: Francois Dugast Date: Tue, 5 Aug 2025 13:59:07 +0000 (+0200) Subject: drm/xe/svm: Migrate folios when possible X-Git-Url: https://www.infradead.org/git/?a=commitdiff_plain;h=979f61633d069d761da606bef5efec42d33509e2;p=users%2Fjedix%2Flinux-maple.git drm/xe/svm: Migrate folios when possible The DMA mapping can now correspond to a folio (order > 0), so move the iterator by the number of pages in the folio in order to migrate all pages at once. This requires forcing contiguous memory for SVM BOs, which greatly simplifies the code and enables 2MB device page support, allowing a major performance improvement. Negative effects like extra eviction are unlikely as SVM BOs have a maximal size of 2MB. v2: - Improve commit message (Matthew Brost) - Fix increment, chunk, assert match (Matthew Brost) Reviewed-by: Matthew Brost Link: https://lore.kernel.org/r/20250805140028.599361-7-francois.dugast@intel.com Signed-off-by: Francois Dugast --- diff --git a/drivers/gpu/drm/xe/xe_bo.c b/drivers/gpu/drm/xe/xe_bo.c index 1a72561f987c..6fea39842e1e 100644 --- a/drivers/gpu/drm/xe/xe_bo.c +++ b/drivers/gpu/drm/xe/xe_bo.c @@ -200,6 +200,8 @@ static bool force_contiguous(u32 bo_flags) else if (bo_flags & XE_BO_FLAG_PINNED && !(bo_flags & XE_BO_FLAG_PINNED_LATE_RESTORE)) return true; /* needs vmap */ + else if (bo_flags & XE_BO_FLAG_CPU_ADDR_MIRROR) + return true; /* * For eviction / restore on suspend / resume objects pinned in VRAM diff --git a/drivers/gpu/drm/xe/xe_svm.c b/drivers/gpu/drm/xe/xe_svm.c index 1d097e76aabc..e35c6d4def20 100644 --- a/drivers/gpu/drm/xe/xe_svm.c +++ b/drivers/gpu/drm/xe/xe_svm.c @@ -383,6 +383,14 @@ static int xe_svm_copy(struct page **pages, } match = vram_addr + PAGE_SIZE * (i - pos) == __vram_addr; + /* Expected with contiguous memory */ + xe_assert(vr->xe, match); + + if (pagemap_addr[i].order) { + i += NR_PAGES(pagemap_addr[i].order) - 1; + chunk = (i - pos) == (XE_MIGRATE_CHUNK_SIZE / PAGE_SIZE); + last = (i + 1) == npages; + } } /*