1 files changed, 95 insertions, 5 deletions

diff --git a/drivers/gpu/drm/nouveau/nvkm/core/memory.c b/drivers/gpu/drm/nouveau/nvkm/core/memory.c
index 8903c04c977e..e85a08ecd9da 100644
--- a/drivers/gpu/drm/nouveau/nvkm/core/memory.c
+++ b/drivers/gpu/drm/nouveau/nvkm/core/memory.c
@@ -22,27 +22,117 @@
  * Authors: Ben Skeggs <bskeggs@redhat.com>
  */
 #include <core/memory.h>
+#include <core/mm.h>
+#include <subdev/fb.h>
 #include <subdev/instmem.h>
 
 void
+nvkm_memory_tags_put(struct nvkm_memory *memory, struct nvkm_device *device,
+		     struct nvkm_tags **ptags)
+{
+	struct nvkm_fb *fb = device->fb;
+	struct nvkm_tags *tags = *ptags;
+	if (tags) {
+		mutex_lock(&fb->subdev.mutex);
+		if (refcount_dec_and_test(&tags->refcount)) {
+			nvkm_mm_free(&fb->tags, &tags->mn);
+			kfree(memory->tags);
+			memory->tags = NULL;
+		}
+		mutex_unlock(&fb->subdev.mutex);
+		*ptags = NULL;
+	}
+}
+
+int
+nvkm_memory_tags_get(struct nvkm_memory *memory, struct nvkm_device *device,
+		     u32 nr, void (*clr)(struct nvkm_device *, u32, u32),
+		     struct nvkm_tags **ptags)
+{
+	struct nvkm_fb *fb = device->fb;
+	struct nvkm_tags *tags;
+
+	mutex_lock(&fb->subdev.mutex);
+	if ((tags = memory->tags)) {
+		/* If comptags exist for the memory, but a different amount
+		 * than requested, the buffer is being mapped with settings
+		 * that are incompatible with existing mappings.
+		 */
+		if (tags->mn && tags->mn->length != nr) {
+			mutex_unlock(&fb->subdev.mutex);
+			return -EINVAL;
+		}
+
+		refcount_inc(&tags->refcount);
+		mutex_unlock(&fb->subdev.mutex);
+		*ptags = tags;
+		return 0;
+	}
+
+	if (!(tags = kmalloc(sizeof(*tags), GFP_KERNEL))) {
+		mutex_unlock(&fb->subdev.mutex);
+		return -ENOMEM;
+	}
+
+	if (!nvkm_mm_head(&fb->tags, 0, 1, nr, nr, 1, &tags->mn)) {
+		if (clr)
+			clr(device, tags->mn->offset, tags->mn->length);
+	} else {
+		/* Failure to allocate HW comptags is not an error, the
+		 * caller should fall back to an uncompressed map.
+		 *
+		 * As memory can be mapped in multiple places, we still
+		 * need to track the allocation failure and ensure that
+		 * any additional mappings remain uncompressed.
+		 *
+		 * This is handled by returning an empty nvkm_tags.
+		 */
+		tags->mn = NULL;
+	}
+
+	refcount_set(&tags->refcount, 1);
+	mutex_unlock(&fb->subdev.mutex);
+	*ptags = tags;
+	return 0;
+}
+
+void
 nvkm_memory_ctor(const struct nvkm_memory_func *func,
 		 struct nvkm_memory *memory)
 {
 	memory->func = func;
+	kref_init(&memory->kref);
+}
+
+static void
+nvkm_memory_del(struct kref *kref)
+{
+	struct nvkm_memory *memory = container_of(kref, typeof(*memory), kref);
+	if (!WARN_ON(!memory->func)) {
+		if (memory->func->dtor)
+			memory = memory->func->dtor(memory);
+		kfree(memory);
+	}
 }
 
 void
-nvkm_memory_del(struct nvkm_memory **pmemory)
+nvkm_memory_unref(struct nvkm_memory **pmemory)
 {
 	struct nvkm_memory *memory = *pmemory;
-	if (memory && !WARN_ON(!memory->func)) {
-		if (memory->func->dtor)
-			*pmemory = memory->func->dtor(memory);
-		kfree(*pmemory);
+	if (memory) {
+		kref_put(&memory->kref, nvkm_memory_del);
 		*pmemory = NULL;
 	}
 }
 
+struct nvkm_memory *
+nvkm_memory_ref(struct nvkm_memory *memory)
+{
+	if (memory)
+		kref_get(&memory->kref);
+	return memory;
+}
+
 int
 nvkm_memory_new(struct nvkm_device *device, enum nvkm_memory_target target,
 		u64 size, u32 align, bool zero,