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drm/amdgpu: improve the userq seq BO free bit lookup

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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 <Prike.Liang@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
(cherry picked from commit ff905a9b6228de9eedd0db71ecb1bdde91fb898d)
This commit is contained in:
Prike Liang
2026-05-26 10:25:26 +08:00
committed by Alex Deucher
parent 2a07f3fa49
commit 5af28a22ce
1 changed files with 6 additions and 5 deletions
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drivers/gpu/drm/amd/amdgpu/amdgpu_seq64.c
+6 -5
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@@ -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);