From bb21700baf7bc7ff9db8085fb0f097e8f8bcc0c5 Mon Sep 17 00:00:00 2001 From: Arunpravin Paneer Selvam Date: Tue, 14 May 2024 20:26:35 +0530 Subject: [PATCH] drm/buddy: Fix the range bias clear memory allocation issue Problem statement: During the system boot time, an application request for the bulk volume of cleared range bias memory when the clear_avail is zero, we dont fallback into normal allocation method as we had an unnecessary clear_avail check which prevents the fallback method leads to fb allocation failure following system goes into unresponsive state. Solution: Remove the unnecessary clear_avail check in the range bias allocation function. v2: add a kunit for this corner case (Daniel Vetter) Signed-off-by: Arunpravin Paneer Selvam Fixes: 96950929eb23 ("drm/buddy: Implement tracking clear page feature") Reviewed-by: Matthew Auld Signed-off-by: Dave Airlie Link: https://patchwork.freedesktop.org/patch/msgid/20240514145636.16253-1-Arunpravin.PaneerSelvam@amd.com --- drivers/gpu/drm/drm_buddy.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/drm_buddy.c b/drivers/gpu/drm/drm_buddy.c index 284ebae71cc4..1daf778cf6fa 100644 --- a/drivers/gpu/drm/drm_buddy.c +++ b/drivers/gpu/drm/drm_buddy.c @@ -249,6 +249,7 @@ int drm_buddy_init(struct drm_buddy *mm, u64 size, u64 chunk_size) mm->size = size; mm->avail = size; + mm->clear_avail = 0; mm->chunk_size = chunk_size; mm->max_order = ilog2(size) - ilog2(chunk_size); @@ -574,7 +575,7 @@ __drm_buddy_alloc_range_bias(struct drm_buddy *mm, block = __alloc_range_bias(mm, start, end, order, flags, fallback); - if (IS_ERR(block) && mm->clear_avail) + if (IS_ERR(block)) return __alloc_range_bias(mm, start, end, order, flags, !fallback); -- 2.25.1