[PATCH 2/2] panthor: use drm_gem_object.gpuva.lock instead of gpuva_list_lock

[Alice Ryhl]

Now that drm_gem_object has a dedicated mutex for the gpuva list that is
intended to be used in cases that must be fence signalling safe, use it
in Panthor.

Signed-off-by: Alice Ryhl <alicer...@google.com>
---
 drivers/gpu/drm/panthor/panthor_gem.c |  4 +---
 drivers/gpu/drm/panthor/panthor_gem.h | 12 ------------
 drivers/gpu/drm/panthor/panthor_mmu.c | 16 ++++++++--------
 3 files changed, 9 insertions(+), 23 deletions(-)

diff --git a/drivers/gpu/drm/panthor/panthor_gem.c 
b/drivers/gpu/drm/panthor/panthor_gem.c
index 
a123bc740ba1460f96882206f598b148b64dc5f6..c654a3377903cf7e067becdb481fb14895a4eaa5
 100644
--- a/drivers/gpu/drm/panthor/panthor_gem.c
+++ b/drivers/gpu/drm/panthor/panthor_gem.c
@@ -74,7 +74,6 @@ static void panthor_gem_free_object(struct drm_gem_object 
*obj)
        mutex_destroy(&bo->label.lock);
 
        drm_gem_free_mmap_offset(&bo->base.base);
-       mutex_destroy(&bo->gpuva_list_lock);
        drm_gem_shmem_free(&bo->base);
        drm_gem_object_put(vm_root_gem);
 }
@@ -246,8 +245,7 @@ struct drm_gem_object *panthor_gem_create_object(struct 
drm_device *ddev, size_t
 
        obj->base.base.funcs = &panthor_gem_funcs;
        obj->base.map_wc = !ptdev->coherent;
-       mutex_init(&obj->gpuva_list_lock);
-       drm_gem_gpuva_set_lock(&obj->base.base, &obj->gpuva_list_lock);
+       drm_gem_gpuva_set_lock(&obj->base.base, &obj->base.base.gpuva.lock);
        mutex_init(&obj->label.lock);
 
        panthor_gem_debugfs_bo_init(obj);
diff --git a/drivers/gpu/drm/panthor/panthor_gem.h 
b/drivers/gpu/drm/panthor/panthor_gem.h
index 
8fc7215e9b900ed162e03aebeae999fda00eeb7a..80c6e24112d0bd0f1561ae4d2224842afb735a59
 100644
--- a/drivers/gpu/drm/panthor/panthor_gem.h
+++ b/drivers/gpu/drm/panthor/panthor_gem.h
@@ -79,18 +79,6 @@ struct panthor_gem_object {
         */
        struct drm_gem_object *exclusive_vm_root_gem;
 
-       /**
-        * @gpuva_list_lock: Custom GPUVA lock.
-        *
-        * Used to protect insertion of drm_gpuva elements to the
-        * drm_gem_object.gpuva.list list.
-        *
-        * We can't use the GEM resv for that, because drm_gpuva_link() is
-        * called in a dma-signaling path, where we're not allowed to take
-        * resv locks.
-        */
-       struct mutex gpuva_list_lock;
-
        /** @flags: Combination of drm_panthor_bo_flags flags. */
        u32 flags;
 
diff --git a/drivers/gpu/drm/panthor/panthor_mmu.c 
b/drivers/gpu/drm/panthor/panthor_mmu.c
index 
4140f697ba5af5769492d3bbb378e18aec8ade98..49ca416c7c2c5a01ab0513029697ba9c7a35832d
 100644
--- a/drivers/gpu/drm/panthor/panthor_mmu.c
+++ b/drivers/gpu/drm/panthor/panthor_mmu.c
@@ -1074,9 +1074,9 @@ static void panthor_vm_bo_put(struct drm_gpuvm_bo *vm_bo)
         * GEM vm_bo list.
         */
        dma_resv_lock(drm_gpuvm_resv(vm), NULL);
-       mutex_lock(&bo->gpuva_list_lock);
+       mutex_lock(&bo->base.base.gpuva.lock);
        unpin = drm_gpuvm_bo_put(vm_bo);
-       mutex_unlock(&bo->gpuva_list_lock);
+       mutex_unlock(&bo->base.base.gpuva.lock);
        dma_resv_unlock(drm_gpuvm_resv(vm));
 
        /* If the vm_bo object was destroyed, release the pin reference that
@@ -1249,9 +1249,9 @@ static int panthor_vm_prepare_map_op_ctx(struct 
panthor_vm_op_ctx *op_ctx,
         * calling this function.
         */
        dma_resv_lock(panthor_vm_resv(vm), NULL);
-       mutex_lock(&bo->gpuva_list_lock);
+       mutex_lock(&bo->base.base.gpuva.lock);
        op_ctx->map.vm_bo = drm_gpuvm_bo_obtain_prealloc(preallocated_vm_bo);
-       mutex_unlock(&bo->gpuva_list_lock);
+       mutex_unlock(&bo->base.base.gpuva.lock);
        dma_resv_unlock(panthor_vm_resv(vm));
 
        /* If the a vm_bo for this <VM,BO> combination exists, it already
@@ -2003,10 +2003,10 @@ static void panthor_vma_link(struct panthor_vm *vm,
 {
        struct panthor_gem_object *bo = to_panthor_bo(vma->base.gem.obj);
 
-       mutex_lock(&bo->gpuva_list_lock);
+       mutex_lock(&bo->base.base.gpuva.lock);
        drm_gpuva_link(&vma->base, vm_bo);
        drm_WARN_ON(&vm->ptdev->base, drm_gpuvm_bo_put(vm_bo));
-       mutex_unlock(&bo->gpuva_list_lock);
+       mutex_unlock(&bo->base.base.gpuva.lock);
 }
 
 static void panthor_vma_unlink(struct panthor_vm *vm,
@@ -2015,9 +2015,9 @@ static void panthor_vma_unlink(struct panthor_vm *vm,
        struct panthor_gem_object *bo = to_panthor_bo(vma->base.gem.obj);
        struct drm_gpuvm_bo *vm_bo = drm_gpuvm_bo_get(vma->base.vm_bo);
 
-       mutex_lock(&bo->gpuva_list_lock);
+       mutex_lock(&bo->base.base.gpuva.lock);
        drm_gpuva_unlink(&vma->base);
-       mutex_unlock(&bo->gpuva_list_lock);
+       mutex_unlock(&bo->base.base.gpuva.lock);
 
        /* drm_gpuva_unlink() release the vm_bo, but we manually retained it
         * when entering this function, so we can implement deferred VMA

-- 
2.51.0.rc0.215.g125493bb4a-goog