drm/amdgpu: Change some variable names to make code easier understood

Add comment to describe some variables otherwise.

Signed-off-by: Alex Xie <AlexBin.Xie@amd.com>
Reviewed-by: Christian König <christian.koenig@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 d19e9386d97b1a8549ba7a7c978ccfc94ddf15d9..00cb58905e949f0ced85a98040859d77940e4ff7 100644 (file)
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
@@ -748,7 +748,7 @@ static void amdgpu_vm_frag_ptes(struct amdgpu_device *adev,
  * @vm: requested vm
  * @start: start of GPU address range
  * @end: end of GPU address range
- * @dst: destination address to map to
+ * @dst: destination address to map to, the next dst inside the function
  * @flags: mapping flags
  *
  * Update the page tables in the range @start - @end.
@@ -762,43 +762,43 @@ static void amdgpu_vm_update_ptes(struct amdgpu_device *adev,
 {
        const uint64_t mask = AMDGPU_VM_PTE_COUNT - 1;
 
-       uint64_t last_pe_start = ~0, last_pe_end = ~0, last_dst = ~0;
-       uint64_t addr;
+       uint64_t cur_pe_start = ~0, cur_pe_end = ~0, cur_dst = ~0;
+       uint64_t addr; /* next GPU address to be updated */
 
        /* walk over the address space and update the page tables */
        for (addr = start; addr < end; ) {
                uint64_t pt_idx = addr >> amdgpu_vm_block_size;
                struct amdgpu_bo *pt = vm->page_tables[pt_idx].entry.robj;
-               unsigned nptes;
-               uint64_t pe_start;
+               unsigned nptes; /* next number of ptes to be updated */
+               uint64_t next_pe_start;
 
                if ((addr & ~mask) == (end & ~mask))
                        nptes = end - addr;
                else
                        nptes = AMDGPU_VM_PTE_COUNT - (addr & mask);
 
-               pe_start = amdgpu_bo_gpu_offset(pt);
-               pe_start += (addr & mask) * 8;
+               next_pe_start = amdgpu_bo_gpu_offset(pt);
+               next_pe_start += (addr & mask) * 8;
 
-               if (last_pe_end != pe_start) {
+               if (cur_pe_end != next_pe_start) {
 
                        amdgpu_vm_frag_ptes(adev, vm_update_params,
-                                           last_pe_start, last_pe_end,
-                                           last_dst, flags);
+                                           cur_pe_start, cur_pe_end,
+                                           cur_dst, flags);
 
-                       last_pe_start = pe_start;
-                       last_pe_end = pe_start + 8 * nptes;
-                       last_dst = dst;
+                       cur_pe_start = next_pe_start;
+                       cur_pe_end = next_pe_start + 8 * nptes;
+                       cur_dst = dst;
                } else {
-                       last_pe_end += 8 * nptes;
+                       cur_pe_end += 8 * nptes;
                }
 
                addr += nptes;
                dst += nptes * AMDGPU_GPU_PAGE_SIZE;
        }
 
-       amdgpu_vm_frag_ptes(adev, vm_update_params, last_pe_start,
-                           last_pe_end, last_dst, flags);
+       amdgpu_vm_frag_ptes(adev, vm_update_params, cur_pe_start,
+                           cur_pe_end, cur_dst, flags);
 }
 
 /**