drm/amdgpu: use leaf iterator for filling PTs

Less overhead and is the starting point for further cleanups and
improvements.

Signed-off-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Felix Kuehling <Felix.Kuehling@amd.com>
Reviewed-by: Junwei Zhang <Jerry.Zhang@amd.com>
Reviewed-by: Huang Rui <ray.huang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

1 files changed, 15 insertions, 47 deletions

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
index cca8fc931bbb..e873bbb2f0c7 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
@@ -1488,36 +1488,6 @@ error:
 }
 
 /**
- * amdgpu_vm_find_entry - find the entry for an address
- *
- * @p: see amdgpu_pte_update_params definition
- * @addr: virtual address in question
- * @entry: resulting entry or NULL
- * @parent: parent entry
- *
- * Find the vm_pt entry and it's parent for the given address.
- */
-void amdgpu_vm_get_entry(struct amdgpu_pte_update_params *p, uint64_t addr,
-                         struct amdgpu_vm_pt **entry,
-                         struct amdgpu_vm_pt **parent)
-{
-        unsigned level = p->adev->vm_manager.root_level;
-
-        *parent = NULL;
-        *entry = &p->vm->root;
-        while ((*entry)->entries) {
-                unsigned shift = amdgpu_vm_level_shift(p->adev, level++);
-
-                *parent = *entry;
-                *entry = &(*entry)->entries[addr >> shift];
-                addr &= (1ULL << shift) - 1;
-        }
-
-        if (level != AMDGPU_VM_PTB)
-                *entry = NULL;
-}
-
-/**
  * amdgpu_vm_handle_huge_pages - handle updating the PD with huge pages
  *
  * @p: see amdgpu_pte_update_params definition
@@ -1580,36 +1550,34 @@ static int amdgpu_vm_update_ptes(struct amdgpu_pte_update_params *params,
 {
         struct amdgpu_device *adev = params->adev;
         const uint64_t mask = AMDGPU_VM_PTE_COUNT(adev) - 1;
-
-        uint64_t addr, pe_start;
-        struct amdgpu_bo *pt;
-        unsigned nptes;
+        struct amdgpu_vm_pt_cursor cursor;
 
         /* walk over the address space and update the page tables */
-        for (addr = start; addr < end; addr += nptes,
-             dst += nptes * AMDGPU_GPU_PAGE_SIZE) {
-                struct amdgpu_vm_pt *entry, *parent;
+        for_each_amdgpu_vm_pt_leaf(adev, params->vm, start, end - 1, cursor) {
+                struct amdgpu_bo *pt = cursor.entry->base.bo;
+                uint64_t pe_start;
+                unsigned nptes;
 
-                amdgpu_vm_get_entry(params, addr, &entry, &parent);
-                if (!entry)
+                if (!pt || cursor.level != AMDGPU_VM_PTB)
                         return -ENOENT;
 
-                if ((addr & ~mask) == (end & ~mask))
-                        nptes = end - addr;
+                if ((cursor.pfn & ~mask) == (end & ~mask))
+                        nptes = end - cursor.pfn;
                 else
-                        nptes = AMDGPU_VM_PTE_COUNT(adev) - (addr & mask);
+                        nptes = AMDGPU_VM_PTE_COUNT(adev) - (cursor.pfn & mask);
 
-                amdgpu_vm_handle_huge_pages(params, entry, parent,
+                amdgpu_vm_handle_huge_pages(params, cursor.entry, cursor.parent,
                                             nptes, dst, flags);
                 /* We don't need to update PTEs for huge pages */
-                if (entry->huge)
+                if (cursor.entry->huge) {
+                        dst += nptes * AMDGPU_GPU_PAGE_SIZE;
                         continue;
+                }
 
-                pt = entry->base.bo;
-                pe_start = (addr & mask) * 8;
+                pe_start = (cursor.pfn & mask) * 8;
                 amdgpu_vm_update_func(params, pt, pe_start, dst, nptes,
                                       AMDGPU_GPU_PAGE_SIZE, flags);
-
+                dst += nptes * AMDGPU_GPU_PAGE_SIZE;
         }
 
         return 0;