drm/amdgpu: use a single linked list for amdgpu_vm_bo_base

Instead of the double linked list. Gets the size of amdgpu_vm_pt down to
64 bytes again.

We could even reduce it down to 32 bytes, but that would require some
rather extreme hacks.

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

4 files changed, 29 insertions, 17 deletions

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c
index de990bdcdd6c..e6909252aefa 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c
@@ -448,7 +448,7 @@ static int amdgpu_bo_do_create(struct amdgpu_device *adev,
                 return -ENOMEM;
         drm_gem_private_object_init(adev->ddev, &bo->gem_base, size);
         INIT_LIST_HEAD(&bo->shadow_list);
-        INIT_LIST_HEAD(&bo->va);
+        bo->vm_bo = NULL;
         bo->preferred_domains = bp->preferred_domain ? bp->preferred_domain :
                 bp->domain;
         bo->allowed_domains = bo->preferred_domains;
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_object.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_object.h
index 907fdf46d895..64337ff2ad63 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_object.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_object.h
@@ -89,8 +89,8 @@ struct amdgpu_bo {
         void                            *metadata;
         u32                             metadata_size;
         unsigned                        prime_shared_count;
-        /* list of all virtual address to which this bo is associated to */
-        struct list_head                va;
+        /* per VM structure for page tables and with virtual addresses */
+        struct amdgpu_vm_bo_base        *vm_bo;
         /* Constant after initialization */
         struct drm_gem_object           gem_base;
         struct amdgpu_bo                *parent;
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
index 234764ac58cf..a7f9aaa47c49 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
@@ -309,12 +309,13 @@ static void amdgpu_vm_bo_base_init(struct amdgpu_vm_bo_base *base,
 {
         base->vm = vm;
         base->bo = bo;
-        INIT_LIST_HEAD(&base->bo_list);
+        base->next = NULL;
         INIT_LIST_HEAD(&base->vm_status);
 
         if (!bo)
                 return;
-        list_add_tail(&base->bo_list, &bo->va);
+        base->next = bo->vm_bo;
+        bo->vm_bo = base;
 
         if (bo->tbo.resv != vm->root.base.bo->tbo.resv)
                 return;
@@ -352,7 +353,7 @@ static struct amdgpu_vm_pt *amdgpu_vm_pt_parent(struct amdgpu_vm_pt *pt)
         if (!parent)
                 return NULL;
 
-        return list_first_entry(&parent->va, struct amdgpu_vm_pt, base.bo_list);
+        return container_of(parent->vm_bo, struct amdgpu_vm_pt, base);
 }
 
 /**
@@ -954,7 +955,7 @@ static void amdgpu_vm_free_pts(struct amdgpu_device *adev,
         for_each_amdgpu_vm_pt_dfs_safe(adev, vm, cursor, entry) {
 
                 if (entry->base.bo) {
-                        list_del(&entry->base.bo_list);
+                        entry->base.bo->vm_bo = NULL;
                         list_del(&entry->base.vm_status);
                         amdgpu_bo_unref(&entry->base.bo->shadow);
                         amdgpu_bo_unref(&entry->base.bo);
@@ -1162,12 +1163,13 @@ int amdgpu_vm_flush(struct amdgpu_ring *ring, struct amdgpu_job *job, bool need_
 struct amdgpu_bo_va *amdgpu_vm_bo_find(struct amdgpu_vm *vm,
                                        struct amdgpu_bo *bo)
 {
-        struct amdgpu_bo_va *bo_va;
+        struct amdgpu_vm_bo_base *base;
 
-        list_for_each_entry(bo_va, &bo->va, base.bo_list) {
-                if (bo_va->base.vm == vm) {
-                        return bo_va;
-                }
+        for (base = bo->vm_bo; base; base = base->next) {
+                if (base->vm != vm)
+                        continue;
+
+                return container_of(base, struct amdgpu_bo_va, base);
         }
         return NULL;
 }
@@ -2728,11 +2730,21 @@ void amdgpu_vm_bo_rmv(struct amdgpu_device *adev,
         struct amdgpu_bo_va_mapping *mapping, *next;
         struct amdgpu_bo *bo = bo_va->base.bo;
         struct amdgpu_vm *vm = bo_va->base.vm;
+        struct amdgpu_vm_bo_base **base;
 
-        if (bo && bo->tbo.resv == vm->root.base.bo->tbo.resv)
-                vm->bulk_moveable = false;
+        if (bo) {
+                if (bo->tbo.resv == vm->root.base.bo->tbo.resv)
+                        vm->bulk_moveable = false;
 
-        list_del(&bo_va->base.bo_list);
+                for (base = &bo_va->base.bo->vm_bo; *base;
+                     base = &(*base)->next) {
+                        if (*base != &bo_va->base)
+                                continue;
+
+                        *base = bo_va->base.next;
+                        break;
+                }
+        }
 
         spin_lock(&vm->invalidated_lock);
         list_del(&bo_va->base.vm_status);
@@ -2774,7 +2786,7 @@ void amdgpu_vm_bo_invalidate(struct amdgpu_device *adev,
         if (bo->parent && bo->parent->shadow == bo)
                 bo = bo->parent;
 
-        list_for_each_entry(bo_base, &bo->va, bo_list) {
+        for (bo_base = bo->vm_bo; bo_base; bo_base = bo_base->next) {
                 struct amdgpu_vm *vm = bo_base->vm;
 
                 if (evicted && bo->tbo.resv == vm->root.base.bo->tbo.resv) {
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.h
index 12d21eec4568..2a8898d19c8b 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.h
@@ -129,7 +129,7 @@ struct amdgpu_vm_bo_base {
         struct amdgpu_bo                *bo;
 
         /* protected by bo being reserved */
-        struct list_head                bo_list;
+        struct amdgpu_vm_bo_base        *next;
 
         /* protected by spinlock */
         struct list_head                vm_status;