From 5af28a22ce834544bb22efbba30ffb837098b2b8 Mon Sep 17 00:00:00 2001 From: Prike Liang Date: Tue, 26 May 2026 10:25:26 +0800 Subject: [PATCH] drm/amdgpu: improve the userq seq BO free bit lookup MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Use find_next_zero_bit() to locate the next free seq slot bit instead of the current walk, for more efficient bitmap scanning. Signed-off-by: Prike Liang Reviewed-by: Christian König Signed-off-by: Alex Deucher (cherry picked from commit ff905a9b6228de9eedd0db71ecb1bdde91fb898d) --- drivers/gpu/drm/amd/amdgpu/amdgpu_seq64.c | 11 ++++++----- 1 file changed, 6 insertions(+), 5 deletions(-) diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_seq64.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_seq64.c index f4be19223588..21a225b0116a 100644 --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_seq64.c +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_seq64.c @@ -173,16 +173,17 @@ error: int amdgpu_seq64_alloc(struct amdgpu_device *adev, u64 *va, u64 *gpu_addr, u64 **cpu_addr) { - unsigned long bit_pos; + unsigned long bit_pos = 0; - for (;;) { - bit_pos = find_first_zero_bit(adev->seq64.used, adev->seq64.num_sem); + do { + bit_pos = find_next_zero_bit(adev->seq64.used, + adev->seq64.num_sem, bit_pos); if (bit_pos >= adev->seq64.num_sem) return -ENOSPC; - if (!test_and_set_bit(bit_pos, adev->seq64.used)) break; - } + bit_pos++; + } while (1); *va = bit_pos * sizeof(u64) + amdgpu_seq64_get_va_base(adev);