From: Christian König <christian.koenig@amd.com>
Date: Fri, 1 Dec 2017 12:28:46 +0000 (+0100)
Subject: drm/amdgpu: avoid the modulo in amdgpu_vm_get_entry
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=e3a1b32a12ef83e260a307e678d053d5f4570acd;p=linux.git

drm/amdgpu: avoid the modulo in amdgpu_vm_get_entry

We can do this with a simple mask as well.

Signed-off-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Chunming Zhou <david1.zhou@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
---

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
index 1c3dd6e0ed334..bd6296a6dab1d 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
@@ -1285,11 +1285,11 @@ void amdgpu_vm_get_entry(struct amdgpu_pte_update_params *p, uint64_t addr,
 	*parent = NULL;
 	*entry = &p->vm->root;
 	while ((*entry)->entries) {
-		unsigned idx = addr >> amdgpu_vm_level_shift(p->adev, level++);
+		unsigned shift = amdgpu_vm_level_shift(p->adev, level++);
 
-		idx %= amdgpu_bo_size((*entry)->base.bo) / 8;
 		*parent = *entry;
-		*entry = &(*entry)->entries[idx];
+		*entry = &(*entry)->entries[addr >> shift];
+		addr &= (1ULL << shift) - 1;
 	}
 
 	if (level != p->adev->vm_manager.num_level)