2 * Copyright (C) Fuzhou Rockchip Electronics Co.Ltd
3 * Author:Mark Yao <mark.yao@rock-chips.com>
5 * This software is licensed under the terms of the GNU General Public
6 * License version 2, as published by the Free Software Foundation, and
7 * may be copied, distributed, and modified under those terms.
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
17 #include <drm/drm_gem.h>
18 #include <drm/drm_sync_helper.h>
19 #include <drm/drm_vma_manager.h>
20 #include <drm/rockchip_drm.h>
22 #include <linux/completion.h>
23 #include <linux/dma-attrs.h>
24 #include <linux/dma-buf.h>
25 #include <linux/reservation.h>
27 #include "rockchip_drm_drv.h"
28 #include "rockchip_drm_gem.h"
30 static int rockchip_gem_alloc_buf(struct rockchip_gem_object *rk_obj,
33 struct drm_gem_object *obj = &rk_obj->base;
34 struct drm_device *drm = obj->dev;
36 init_dma_attrs(&rk_obj->dma_attrs);
37 dma_set_attr(DMA_ATTR_WRITE_COMBINE, &rk_obj->dma_attrs);
40 dma_set_attr(DMA_ATTR_NO_KERNEL_MAPPING, &rk_obj->dma_attrs);
42 rk_obj->kvaddr = dma_alloc_attrs(drm->dev, obj->size,
43 &rk_obj->dma_addr, GFP_KERNEL,
45 if (!rk_obj->kvaddr) {
46 DRM_ERROR("failed to allocate %zu byte dma buffer", obj->size);
53 static void rockchip_gem_free_buf(struct rockchip_gem_object *rk_obj)
55 struct drm_gem_object *obj = &rk_obj->base;
56 struct drm_device *drm = obj->dev;
58 dma_free_attrs(drm->dev, obj->size, rk_obj->kvaddr, rk_obj->dma_addr,
62 static int rockchip_drm_gem_object_mmap(struct drm_gem_object *obj,
63 struct vm_area_struct *vma)
67 struct rockchip_gem_object *rk_obj = to_rockchip_obj(obj);
68 struct drm_device *drm = obj->dev;
71 * dma_alloc_attrs() allocated a struct page table for rk_obj, so clear
72 * VM_PFNMAP flag that was set by drm_gem_mmap_obj()/drm_gem_mmap().
74 vma->vm_flags &= ~VM_PFNMAP;
77 ret = dma_mmap_attrs(drm->dev, vma, rk_obj->kvaddr, rk_obj->dma_addr,
78 obj->size, &rk_obj->dma_attrs);
80 drm_gem_vm_close(vma);
85 int rockchip_gem_mmap_buf(struct drm_gem_object *obj,
86 struct vm_area_struct *vma)
90 ret = drm_gem_mmap_obj(obj, obj->size, vma);
94 return rockchip_drm_gem_object_mmap(obj, vma);
97 /* drm driver mmap file operations */
98 int rockchip_gem_mmap(struct file *filp, struct vm_area_struct *vma)
100 struct drm_gem_object *obj;
103 ret = drm_gem_mmap(filp, vma);
107 obj = vma->vm_private_data;
109 return rockchip_drm_gem_object_mmap(obj, vma);
112 struct rockchip_gem_object *
113 rockchip_gem_create_object(struct drm_device *drm, unsigned int size,
116 struct rockchip_gem_object *rk_obj;
117 struct drm_gem_object *obj;
120 size = round_up(size, PAGE_SIZE);
122 rk_obj = kzalloc(sizeof(*rk_obj), GFP_KERNEL);
124 return ERR_PTR(-ENOMEM);
128 drm_gem_private_object_init(drm, obj, size);
130 ret = rockchip_gem_alloc_buf(rk_obj, alloc_kmap);
132 goto err_free_rk_obj;
142 * rockchip_gem_free_object - (struct drm_driver)->gem_free_object callback
145 void rockchip_gem_free_object(struct drm_gem_object *obj)
147 struct rockchip_gem_object *rk_obj;
149 drm_gem_free_mmap_offset(obj);
151 rk_obj = to_rockchip_obj(obj);
153 rockchip_gem_free_buf(rk_obj);
155 #ifdef CONFIG_DRM_DMA_SYNC
156 drm_fence_signal_and_put(&rk_obj->acquire_fence);
163 * rockchip_gem_create_with_handle - allocate an object with the given
164 * size and create a gem handle on it
166 * returns a struct rockchip_gem_object* on success or ERR_PTR values
169 static struct rockchip_gem_object *
170 rockchip_gem_create_with_handle(struct drm_file *file_priv,
171 struct drm_device *drm, unsigned int size,
172 unsigned int *handle)
174 struct rockchip_gem_object *rk_obj;
175 struct drm_gem_object *obj;
178 rk_obj = rockchip_gem_create_object(drm, size, false);
180 return ERR_CAST(rk_obj);
185 * allocate a id of idr table where the obj is registered
186 * and handle has the id what user can see.
188 ret = drm_gem_handle_create(file_priv, obj, handle);
190 goto err_handle_create;
192 /* drop reference from allocate - handle holds it now. */
193 drm_gem_object_unreference_unlocked(obj);
198 rockchip_gem_free_object(obj);
203 int rockchip_gem_dumb_map_offset(struct drm_file *file_priv,
204 struct drm_device *dev, uint32_t handle,
207 struct drm_gem_object *obj;
210 obj = drm_gem_object_lookup(dev, file_priv, handle);
212 DRM_ERROR("failed to lookup gem object.\n");
216 ret = drm_gem_create_mmap_offset(obj);
220 *offset = drm_vma_node_offset_addr(&obj->vma_node);
221 DRM_DEBUG_KMS("offset = 0x%llx\n", *offset);
224 drm_gem_object_unreference_unlocked(obj);
230 * rockchip_gem_dumb_create - (struct drm_driver)->dumb_create callback
233 * This aligns the pitch and size arguments to the minimum required. wrap
234 * this into your own function if you need bigger alignment.
236 int rockchip_gem_dumb_create(struct drm_file *file_priv,
237 struct drm_device *dev,
238 struct drm_mode_create_dumb *args)
240 struct rockchip_gem_object *rk_obj;
241 int min_pitch = DIV_ROUND_UP(args->width * args->bpp, 8);
244 * align to 64 bytes since Mali requires it.
246 args->pitch = ALIGN(min_pitch, 64);
247 args->size = args->pitch * args->height;
249 rk_obj = rockchip_gem_create_with_handle(file_priv, dev, args->size,
252 return PTR_ERR_OR_ZERO(rk_obj);
255 int rockchip_gem_map_offset_ioctl(struct drm_device *drm, void *data,
256 struct drm_file *file_priv)
258 struct drm_rockchip_gem_map_off *args = data;
260 return rockchip_gem_dumb_map_offset(file_priv, drm, args->handle,
264 int rockchip_gem_create_ioctl(struct drm_device *dev, void *data,
265 struct drm_file *file_priv)
267 struct drm_rockchip_gem_create *args = data;
268 struct rockchip_gem_object *rk_obj;
270 rk_obj = rockchip_gem_create_with_handle(file_priv, dev, args->size,
272 return PTR_ERR_OR_ZERO(rk_obj);
275 static struct reservation_object *drm_gem_get_resv(struct drm_gem_object *gem)
277 struct dma_buf *dma_buf = gem->dma_buf;
278 return dma_buf ? dma_buf->resv : NULL;
281 #ifdef CONFIG_DRM_DMA_SYNC
282 static void rockchip_gem_acquire_complete(struct drm_reservation_cb *rcb,
285 struct completion *compl = context;
289 static int rockchip_gem_acquire(struct drm_device *dev,
290 struct rockchip_gem_object *rockchip_gem_obj,
294 struct rockchip_drm_private *dev_priv = dev->dev_private;
295 struct reservation_object *resv =
296 drm_gem_get_resv(&rockchip_gem_obj->base);
298 struct drm_reservation_cb rcb;
299 DECLARE_COMPLETION_ONSTACK(compl);
305 !rockchip_gem_obj->acquire_exclusive &&
306 rockchip_gem_obj->acquire_fence) {
307 atomic_inc(&rockchip_gem_obj->acquire_shared_count);
311 fence = drm_sw_fence_new(dev_priv->cpu_fence_context,
312 atomic_add_return(1, &dev_priv->cpu_fence_seqno));
314 ret = PTR_ERR(fence);
315 DRM_ERROR("Failed to create acquire fence %d.\n", ret);
318 ww_mutex_lock(&resv->lock, NULL);
320 ret = reservation_object_reserve_shared(resv);
322 DRM_ERROR("Failed to reserve space for shared fence %d.\n",
327 drm_reservation_cb_init(&rcb, rockchip_gem_acquire_complete, &compl);
328 ret = drm_reservation_cb_add(&rcb, resv, exclusive);
330 DRM_ERROR("Failed to add reservation to callback %d.\n", ret);
333 drm_reservation_cb_done(&rcb);
335 reservation_object_add_excl_fence(resv, fence);
337 reservation_object_add_shared_fence(resv, fence);
339 ww_mutex_unlock(&resv->lock);
340 mutex_unlock(&dev->struct_mutex);
341 ret = wait_for_completion_interruptible(&compl);
342 mutex_lock(&dev->struct_mutex);
344 DRM_ERROR("Failed wait for reservation callback %d.\n", ret);
345 drm_reservation_cb_fini(&rcb);
346 /* somebody else may be already waiting on it */
347 drm_fence_signal_and_put(&fence);
350 rockchip_gem_obj->acquire_fence = fence;
351 rockchip_gem_obj->acquire_exclusive = exclusive;
352 atomic_set(&rockchip_gem_obj->acquire_shared_count, 1);
356 ww_mutex_unlock(&resv->lock);
361 static void rockchip_gem_release(struct rockchip_gem_object *rockchip_gem_obj)
363 BUG_ON(!rockchip_gem_obj->acquire_fence);
364 if (atomic_sub_and_test(1,
365 &rockchip_gem_obj->acquire_shared_count))
366 drm_fence_signal_and_put(&rockchip_gem_obj->acquire_fence);
370 int rockchip_gem_cpu_acquire_ioctl(struct drm_device *dev, void *data,
371 struct drm_file *file)
373 struct drm_rockchip_gem_cpu_acquire *args = data;
374 struct rockchip_drm_file_private *file_priv = file->driver_priv;
375 struct drm_gem_object *obj;
376 struct rockchip_gem_object *rockchip_gem_obj;
377 struct rockchip_gem_object_node *gem_node;
380 DRM_DEBUG_KMS("[BO:%u] flags: 0x%x\n", args->handle, args->flags);
382 mutex_lock(&dev->struct_mutex);
384 obj = drm_gem_object_lookup(dev, file, args->handle);
386 DRM_ERROR("failed to lookup gem object.\n");
391 rockchip_gem_obj = to_rockchip_obj(obj);
393 if (!drm_gem_get_resv(&rockchip_gem_obj->base)) {
394 /* If there is no reservation object present, there is no
395 * cross-process/cross-device sharing and sync is unnecessary.
401 #ifdef CONFIG_DRM_DMA_SYNC
402 ret = rockchip_gem_acquire(dev, rockchip_gem_obj,
403 args->flags & DRM_ROCKCHIP_GEM_CPU_ACQUIRE_EXCLUSIVE);
408 gem_node = kzalloc(sizeof(*gem_node), GFP_KERNEL);
410 DRM_ERROR("Failed to allocate rockchip_drm_gem_obj_node.\n");
415 gem_node->rockchip_gem_obj = rockchip_gem_obj;
416 list_add(&gem_node->list, &file_priv->gem_cpu_acquire_list);
417 mutex_unlock(&dev->struct_mutex);
421 #ifdef CONFIG_DRM_DMA_SYNC
422 rockchip_gem_release(rockchip_gem_obj);
425 drm_gem_object_unreference(obj);
428 mutex_unlock(&dev->struct_mutex);
432 int rockchip_gem_cpu_release_ioctl(struct drm_device *dev, void *data,
433 struct drm_file *file)
435 struct drm_rockchip_gem_cpu_release *args = data;
436 struct rockchip_drm_file_private *file_priv = file->driver_priv;
437 struct drm_gem_object *obj;
438 struct rockchip_gem_object *rockchip_gem_obj;
439 struct list_head *cur;
442 DRM_DEBUG_KMS("[BO:%u]\n", args->handle);
444 mutex_lock(&dev->struct_mutex);
446 obj = drm_gem_object_lookup(dev, file, args->handle);
448 DRM_ERROR("failed to lookup gem object.\n");
453 rockchip_gem_obj = to_rockchip_obj(obj);
455 if (!drm_gem_get_resv(&rockchip_gem_obj->base)) {
456 /* If there is no reservation object present, there is no
457 * cross-process/cross-device sharing and sync is unnecessary.
463 list_for_each(cur, &file_priv->gem_cpu_acquire_list) {
464 struct rockchip_gem_object_node *node = list_entry(
465 cur, struct rockchip_gem_object_node, list);
466 if (node->rockchip_gem_obj == rockchip_gem_obj)
469 if (cur == &file_priv->gem_cpu_acquire_list) {
470 DRM_ERROR("gem object not acquired for current process.\n");
475 #ifdef CONFIG_DRM_DMA_SYNC
476 rockchip_gem_release(rockchip_gem_obj);
480 kfree(list_entry(cur, struct rockchip_gem_object_node, list));
481 /* unreference for the reference held since cpu_acquire_ioctl */
482 drm_gem_object_unreference(obj);
486 /* unreference for the reference from drm_gem_object_lookup() */
487 drm_gem_object_unreference(obj);
490 mutex_unlock(&dev->struct_mutex);
495 * Allocate a sg_table for this GEM object.
496 * Note: Both the table's contents, and the sg_table itself must be freed by
498 * Returns a pointer to the newly allocated sg_table, or an ERR_PTR() error.
500 struct sg_table *rockchip_gem_prime_get_sg_table(struct drm_gem_object *obj)
502 struct rockchip_gem_object *rk_obj = to_rockchip_obj(obj);
503 struct drm_device *drm = obj->dev;
504 struct sg_table *sgt;
507 sgt = kzalloc(sizeof(*sgt), GFP_KERNEL);
509 return ERR_PTR(-ENOMEM);
511 ret = dma_get_sgtable_attrs(drm->dev, sgt, rk_obj->kvaddr,
512 rk_obj->dma_addr, obj->size,
515 DRM_ERROR("failed to allocate sgt, %d\n", ret);
523 void *rockchip_gem_prime_vmap(struct drm_gem_object *obj)
525 struct rockchip_gem_object *rk_obj = to_rockchip_obj(obj);
527 if (dma_get_attr(DMA_ATTR_NO_KERNEL_MAPPING, &rk_obj->dma_attrs))
530 return rk_obj->kvaddr;
533 void rockchip_gem_prime_vunmap(struct drm_gem_object *obj, void *vaddr)