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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: 0ybYxz8JBk4UE4W0TaK8xmk3oROlx9xlg1P08h6EBRGcDEVppvomwWe+FkRPzcpm1lESe/C/dZxqOkShoYo77EQfY9ZhP8LwuCiDjlOyo/Ln85N+mKomUFK6suVbXbDLbjR6sqz0J1kUGx/87k17Kt+6Ju+rzITbTOp+5WloExZyLYEpCtzNS2wPjG5AiOCpmJyfgbQwSDBHSGJpC9fei2S2nFGEU8xJj2Vz28b4l4D01lg11ieIKjowGvCuWWA5/ng/H9qlzKMi9sMOkpApdYxvKfRZ0b3dGaQ4gjcWoWS9AjqI4YuGD+mWjZTEI6n24tUW0J8JY6F2jfy5/8IhuBSu5lEAvQI5BzDanKDYOpqo3dhb1OPJazgRLKF31HuYRvIeOCTkP/z9HNIYgrm8EmaIh6hJRfiJXcMup6KDMKcy5jPzWkphusUchL+zin5l X-OriginatorOrg: arm.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 18 Sep 2026 16:49:16.4955 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: b68e2c9c-ac3e-44af-33e8-08df15a4c6ea X-MS-Exchange-CrossTenant-Id: f34e5979-57d9-4aaa-ad4d-b122a662184d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=f34e5979-57d9-4aaa-ad4d-b122a662184d;Ip=[4.158.2.129];Helo=[outbound-uk1.az.dlp.m.darktrace.com] X-MS-Exchange-CrossTenant-AuthSource: DB1PEPF000509EE.eurprd03.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: PAVPR08MB9186 On 9/17/26 13:33, Boris Brezillon wrote: > With the recent changes to iova_mapped_as_huge_page(), the check for > huge-page mapping of sparse BOs is actually simple: > > - for a sparse mapping, we know the BO offset any VA in this regions is > va & (SZ_2M - 1) > - the VA we're searching the BO offset for is the 2M-aligned > aligned_va value > > This guarantees that the BO offset to check is always zero in that case. > > This is simple enough to let the code check if page 0 is a huge page > and save the unmap+map dance when the dummy BO is not backed by a > a huge page. So let's do that and kill the comment that says it's too > complicated. > > Signed-off-by: Boris Brezillon > --- Thanks for this change. Looks good to me. Reviewed-by: Akash Goel > drivers/gpu/drm/panthor/panthor_mmu.c | 15 ++++++++------- > 1 file changed, 8 insertions(+), 7 deletions(-) > > diff --git a/drivers/gpu/drm/panthor/panthor_mmu.c b/drivers/gpu/drm/panthor/panthor_mmu.c > index d2897099763e..01564d250adf 100644 > --- a/drivers/gpu/drm/panthor/panthor_mmu.c > +++ b/drivers/gpu/drm/panthor/panthor_mmu.c > @@ -2337,18 +2337,18 @@ iova_mapped_as_huge_page(struct drm_gpuva *mapping, u64 va) > > return false; > } else { > - const struct page *pg = bo->backing.pages[bo_offset >> PAGE_SHIFT]; > struct panthor_vma *vma = container_of(mapping, struct panthor_vma, base); > bool is_sparse = vma->flags & DRM_PANTHOR_VM_BIND_OP_MAP_SPARSE; > + const struct page *pg; > > - /* If the unmapped VMA stands for a sparse mapping, always > - * assume the backing storage is a THP, since the overhead of > - * unmapping 2MiB worth of 4KiB pages and remapping some of > - * them is offset by the logic of working out whether it's > - * the opposite case right below. > + /* BO offset on a sparse mapping is chosen so that 2M-aligned > + * VAs point to the start of the BO. Since aligned_va (the > + * address we check huge-page against) is 2M-aligned, the BO > + * offset is guaranteed to be zero. > + * Check panthor_fix_sparse_map_offset() for more details. > */ > if (is_sparse) > - return true; > + bo_offset = 0; > > /* In case of shmem backing, we know we can only have a huge > * mapping if the bo_offset is 2M aligned, meaning we can skip > @@ -2357,6 +2357,7 @@ iova_mapped_as_huge_page(struct drm_gpuva *mapping, u64 va) > if (!IS_ALIGNED(bo_offset, SZ_2M)) > return false; > > + pg = bo->backing.pages[bo_offset >> PAGE_SHIFT]; > return folio_size(page_folio(pg)) >= SZ_2M; > } > } >