1 // SPDX-License-Identifier: GPL-2.0-only
3 * Copyright (C) 2012 Avionic Design GmbH
4 * Copyright (C) 2012-2016 NVIDIA CORPORATION. All rights reserved.
7 #include <linux/bitops.h>
8 #include <linux/host1x.h>
10 #include <linux/iommu.h>
11 #include <linux/module.h>
12 #include <linux/platform_device.h>
13 #include <linux/pm_runtime.h>
15 #include <drm/drm_aperture.h>
16 #include <drm/drm_atomic.h>
17 #include <drm/drm_atomic_helper.h>
18 #include <drm/drm_debugfs.h>
19 #include <drm/drm_drv.h>
20 #include <drm/drm_fourcc.h>
21 #include <drm/drm_ioctl.h>
22 #include <drm/drm_prime.h>
23 #include <drm/drm_vblank.h>
25 #if IS_ENABLED(CONFIG_ARM_DMA_USE_IOMMU)
26 #include <asm/dma-iommu.h>
34 #define DRIVER_NAME "tegra"
35 #define DRIVER_DESC "NVIDIA Tegra graphics"
36 #define DRIVER_DATE "20120330"
37 #define DRIVER_MAJOR 1
38 #define DRIVER_MINOR 0
39 #define DRIVER_PATCHLEVEL 0
41 #define CARVEOUT_SZ SZ_64M
42 #define CDMA_GATHER_FETCHES_MAX_NB 16383
44 static int tegra_atomic_check(struct drm_device *drm,
45 struct drm_atomic_state *state)
49 err = drm_atomic_helper_check(drm, state);
53 return tegra_display_hub_atomic_check(drm, state);
56 static const struct drm_mode_config_funcs tegra_drm_mode_config_funcs = {
57 .fb_create = tegra_fb_create,
58 #ifdef CONFIG_DRM_FBDEV_EMULATION
59 .output_poll_changed = drm_fb_helper_output_poll_changed,
61 .atomic_check = tegra_atomic_check,
62 .atomic_commit = drm_atomic_helper_commit,
65 static void tegra_atomic_post_commit(struct drm_device *drm,
66 struct drm_atomic_state *old_state)
68 struct drm_crtc_state *old_crtc_state __maybe_unused;
69 struct drm_crtc *crtc;
72 for_each_old_crtc_in_state(old_state, crtc, old_crtc_state, i)
73 tegra_crtc_atomic_post_commit(crtc, old_state);
76 static void tegra_atomic_commit_tail(struct drm_atomic_state *old_state)
78 struct drm_device *drm = old_state->dev;
79 struct tegra_drm *tegra = drm->dev_private;
82 bool fence_cookie = dma_fence_begin_signalling();
84 drm_atomic_helper_commit_modeset_disables(drm, old_state);
85 tegra_display_hub_atomic_commit(drm, old_state);
86 drm_atomic_helper_commit_planes(drm, old_state, 0);
87 drm_atomic_helper_commit_modeset_enables(drm, old_state);
88 drm_atomic_helper_commit_hw_done(old_state);
89 dma_fence_end_signalling(fence_cookie);
90 drm_atomic_helper_wait_for_vblanks(drm, old_state);
91 drm_atomic_helper_cleanup_planes(drm, old_state);
93 drm_atomic_helper_commit_tail_rpm(old_state);
96 tegra_atomic_post_commit(drm, old_state);
99 static const struct drm_mode_config_helper_funcs
100 tegra_drm_mode_config_helpers = {
101 .atomic_commit_tail = tegra_atomic_commit_tail,
104 static int tegra_drm_open(struct drm_device *drm, struct drm_file *filp)
106 struct tegra_drm_file *fpriv;
108 fpriv = kzalloc(sizeof(*fpriv), GFP_KERNEL);
112 idr_init_base(&fpriv->legacy_contexts, 1);
113 xa_init_flags(&fpriv->contexts, XA_FLAGS_ALLOC1);
114 xa_init(&fpriv->syncpoints);
115 mutex_init(&fpriv->lock);
116 filp->driver_priv = fpriv;
121 static void tegra_drm_context_free(struct tegra_drm_context *context)
123 context->client->ops->close_channel(context);
124 pm_runtime_put(context->client->base.dev);
128 static int host1x_reloc_copy_from_user(struct host1x_reloc *dest,
129 struct drm_tegra_reloc __user *src,
130 struct drm_device *drm,
131 struct drm_file *file)
136 err = get_user(cmdbuf, &src->cmdbuf.handle);
140 err = get_user(dest->cmdbuf.offset, &src->cmdbuf.offset);
144 err = get_user(target, &src->target.handle);
148 err = get_user(dest->target.offset, &src->target.offset);
152 err = get_user(dest->shift, &src->shift);
156 dest->flags = HOST1X_RELOC_READ | HOST1X_RELOC_WRITE;
158 dest->cmdbuf.bo = tegra_gem_lookup(file, cmdbuf);
159 if (!dest->cmdbuf.bo)
162 dest->target.bo = tegra_gem_lookup(file, target);
163 if (!dest->target.bo)
169 int tegra_drm_submit(struct tegra_drm_context *context,
170 struct drm_tegra_submit *args, struct drm_device *drm,
171 struct drm_file *file)
173 struct host1x_client *client = &context->client->base;
174 unsigned int num_cmdbufs = args->num_cmdbufs;
175 unsigned int num_relocs = args->num_relocs;
176 struct drm_tegra_cmdbuf __user *user_cmdbufs;
177 struct drm_tegra_reloc __user *user_relocs;
178 struct drm_tegra_syncpt __user *user_syncpt;
179 struct drm_tegra_syncpt syncpt;
180 struct host1x *host1x = dev_get_drvdata(drm->dev->parent);
181 struct drm_gem_object **refs;
182 struct host1x_syncpt *sp = NULL;
183 struct host1x_job *job;
184 unsigned int num_refs;
187 user_cmdbufs = u64_to_user_ptr(args->cmdbufs);
188 user_relocs = u64_to_user_ptr(args->relocs);
189 user_syncpt = u64_to_user_ptr(args->syncpts);
191 /* We don't yet support other than one syncpt_incr struct per submit */
192 if (args->num_syncpts != 1)
195 /* We don't yet support waitchks */
196 if (args->num_waitchks != 0)
199 job = host1x_job_alloc(context->channel, args->num_cmdbufs,
200 args->num_relocs, false);
204 job->num_relocs = args->num_relocs;
205 job->client = client;
206 job->class = client->class;
207 job->serialize = true;
208 job->syncpt_recovery = true;
211 * Track referenced BOs so that they can be unreferenced after the
212 * submission is complete.
214 num_refs = num_cmdbufs + num_relocs * 2;
216 refs = kmalloc_array(num_refs, sizeof(*refs), GFP_KERNEL);
222 /* reuse as an iterator later */
225 while (num_cmdbufs) {
226 struct drm_tegra_cmdbuf cmdbuf;
227 struct host1x_bo *bo;
228 struct tegra_bo *obj;
231 if (copy_from_user(&cmdbuf, user_cmdbufs, sizeof(cmdbuf))) {
237 * The maximum number of CDMA gather fetches is 16383, a higher
238 * value means the words count is malformed.
240 if (cmdbuf.words > CDMA_GATHER_FETCHES_MAX_NB) {
245 bo = tegra_gem_lookup(file, cmdbuf.handle);
251 offset = (u64)cmdbuf.offset + (u64)cmdbuf.words * sizeof(u32);
252 obj = host1x_to_tegra_bo(bo);
253 refs[num_refs++] = &obj->gem;
256 * Gather buffer base address must be 4-bytes aligned,
257 * unaligned offset is malformed and cause commands stream
258 * corruption on the buffer address relocation.
260 if (offset & 3 || offset > obj->gem.size) {
265 host1x_job_add_gather(job, bo, cmdbuf.words, cmdbuf.offset);
270 /* copy and resolve relocations from submit */
271 while (num_relocs--) {
272 struct host1x_reloc *reloc;
273 struct tegra_bo *obj;
275 err = host1x_reloc_copy_from_user(&job->relocs[num_relocs],
276 &user_relocs[num_relocs], drm,
281 reloc = &job->relocs[num_relocs];
282 obj = host1x_to_tegra_bo(reloc->cmdbuf.bo);
283 refs[num_refs++] = &obj->gem;
286 * The unaligned cmdbuf offset will cause an unaligned write
287 * during of the relocations patching, corrupting the commands
290 if (reloc->cmdbuf.offset & 3 ||
291 reloc->cmdbuf.offset >= obj->gem.size) {
296 obj = host1x_to_tegra_bo(reloc->target.bo);
297 refs[num_refs++] = &obj->gem;
299 if (reloc->target.offset >= obj->gem.size) {
305 if (copy_from_user(&syncpt, user_syncpt, sizeof(syncpt))) {
310 /* Syncpoint ref will be dropped on job release. */
311 sp = host1x_syncpt_get_by_id(host1x, syncpt.id);
317 job->is_addr_reg = context->client->ops->is_addr_reg;
318 job->is_valid_class = context->client->ops->is_valid_class;
319 job->syncpt_incrs = syncpt.incrs;
321 job->timeout = 10000;
323 if (args->timeout && args->timeout < 10000)
324 job->timeout = args->timeout;
326 err = host1x_job_pin(job, context->client->base.dev);
330 err = host1x_job_submit(job);
332 host1x_job_unpin(job);
336 args->fence = job->syncpt_end;
340 drm_gem_object_put(refs[num_refs]);
350 #ifdef CONFIG_DRM_TEGRA_STAGING
351 static int tegra_gem_create(struct drm_device *drm, void *data,
352 struct drm_file *file)
354 struct drm_tegra_gem_create *args = data;
357 bo = tegra_bo_create_with_handle(file, drm, args->size, args->flags,
365 static int tegra_gem_mmap(struct drm_device *drm, void *data,
366 struct drm_file *file)
368 struct drm_tegra_gem_mmap *args = data;
369 struct drm_gem_object *gem;
372 gem = drm_gem_object_lookup(file, args->handle);
376 bo = to_tegra_bo(gem);
378 args->offset = drm_vma_node_offset_addr(&bo->gem.vma_node);
380 drm_gem_object_put(gem);
385 static int tegra_syncpt_read(struct drm_device *drm, void *data,
386 struct drm_file *file)
388 struct host1x *host = dev_get_drvdata(drm->dev->parent);
389 struct drm_tegra_syncpt_read *args = data;
390 struct host1x_syncpt *sp;
392 sp = host1x_syncpt_get_by_id_noref(host, args->id);
396 args->value = host1x_syncpt_read_min(sp);
400 static int tegra_syncpt_incr(struct drm_device *drm, void *data,
401 struct drm_file *file)
403 struct host1x *host1x = dev_get_drvdata(drm->dev->parent);
404 struct drm_tegra_syncpt_incr *args = data;
405 struct host1x_syncpt *sp;
407 sp = host1x_syncpt_get_by_id_noref(host1x, args->id);
411 return host1x_syncpt_incr(sp);
414 static int tegra_syncpt_wait(struct drm_device *drm, void *data,
415 struct drm_file *file)
417 struct host1x *host1x = dev_get_drvdata(drm->dev->parent);
418 struct drm_tegra_syncpt_wait *args = data;
419 struct host1x_syncpt *sp;
421 sp = host1x_syncpt_get_by_id_noref(host1x, args->id);
425 return host1x_syncpt_wait(sp, args->thresh,
426 msecs_to_jiffies(args->timeout),
430 static int tegra_client_open(struct tegra_drm_file *fpriv,
431 struct tegra_drm_client *client,
432 struct tegra_drm_context *context)
436 err = pm_runtime_resume_and_get(client->base.dev);
440 err = client->ops->open_channel(client, context);
442 pm_runtime_put(client->base.dev);
446 err = idr_alloc(&fpriv->legacy_contexts, context, 1, 0, GFP_KERNEL);
448 client->ops->close_channel(context);
449 pm_runtime_put(client->base.dev);
453 context->client = client;
459 static int tegra_open_channel(struct drm_device *drm, void *data,
460 struct drm_file *file)
462 struct tegra_drm_file *fpriv = file->driver_priv;
463 struct tegra_drm *tegra = drm->dev_private;
464 struct drm_tegra_open_channel *args = data;
465 struct tegra_drm_context *context;
466 struct tegra_drm_client *client;
469 context = kzalloc(sizeof(*context), GFP_KERNEL);
473 mutex_lock(&fpriv->lock);
475 list_for_each_entry(client, &tegra->clients, list)
476 if (client->base.class == args->client) {
477 err = tegra_client_open(fpriv, client, context);
481 args->context = context->id;
488 mutex_unlock(&fpriv->lock);
492 static int tegra_close_channel(struct drm_device *drm, void *data,
493 struct drm_file *file)
495 struct tegra_drm_file *fpriv = file->driver_priv;
496 struct drm_tegra_close_channel *args = data;
497 struct tegra_drm_context *context;
500 mutex_lock(&fpriv->lock);
502 context = idr_find(&fpriv->legacy_contexts, args->context);
508 idr_remove(&fpriv->legacy_contexts, context->id);
509 tegra_drm_context_free(context);
512 mutex_unlock(&fpriv->lock);
516 static int tegra_get_syncpt(struct drm_device *drm, void *data,
517 struct drm_file *file)
519 struct tegra_drm_file *fpriv = file->driver_priv;
520 struct drm_tegra_get_syncpt *args = data;
521 struct tegra_drm_context *context;
522 struct host1x_syncpt *syncpt;
525 mutex_lock(&fpriv->lock);
527 context = idr_find(&fpriv->legacy_contexts, args->context);
533 if (args->index >= context->client->base.num_syncpts) {
538 syncpt = context->client->base.syncpts[args->index];
539 args->id = host1x_syncpt_id(syncpt);
542 mutex_unlock(&fpriv->lock);
546 static int tegra_submit(struct drm_device *drm, void *data,
547 struct drm_file *file)
549 struct tegra_drm_file *fpriv = file->driver_priv;
550 struct drm_tegra_submit *args = data;
551 struct tegra_drm_context *context;
554 mutex_lock(&fpriv->lock);
556 context = idr_find(&fpriv->legacy_contexts, args->context);
562 err = context->client->ops->submit(context, args, drm, file);
565 mutex_unlock(&fpriv->lock);
569 static int tegra_get_syncpt_base(struct drm_device *drm, void *data,
570 struct drm_file *file)
572 struct tegra_drm_file *fpriv = file->driver_priv;
573 struct drm_tegra_get_syncpt_base *args = data;
574 struct tegra_drm_context *context;
575 struct host1x_syncpt_base *base;
576 struct host1x_syncpt *syncpt;
579 mutex_lock(&fpriv->lock);
581 context = idr_find(&fpriv->legacy_contexts, args->context);
587 if (args->syncpt >= context->client->base.num_syncpts) {
592 syncpt = context->client->base.syncpts[args->syncpt];
594 base = host1x_syncpt_get_base(syncpt);
600 args->id = host1x_syncpt_base_id(base);
603 mutex_unlock(&fpriv->lock);
607 static int tegra_gem_set_tiling(struct drm_device *drm, void *data,
608 struct drm_file *file)
610 struct drm_tegra_gem_set_tiling *args = data;
611 enum tegra_bo_tiling_mode mode;
612 struct drm_gem_object *gem;
613 unsigned long value = 0;
616 switch (args->mode) {
617 case DRM_TEGRA_GEM_TILING_MODE_PITCH:
618 mode = TEGRA_BO_TILING_MODE_PITCH;
620 if (args->value != 0)
625 case DRM_TEGRA_GEM_TILING_MODE_TILED:
626 mode = TEGRA_BO_TILING_MODE_TILED;
628 if (args->value != 0)
633 case DRM_TEGRA_GEM_TILING_MODE_BLOCK:
634 mode = TEGRA_BO_TILING_MODE_BLOCK;
646 gem = drm_gem_object_lookup(file, args->handle);
650 bo = to_tegra_bo(gem);
652 bo->tiling.mode = mode;
653 bo->tiling.value = value;
655 drm_gem_object_put(gem);
660 static int tegra_gem_get_tiling(struct drm_device *drm, void *data,
661 struct drm_file *file)
663 struct drm_tegra_gem_get_tiling *args = data;
664 struct drm_gem_object *gem;
668 gem = drm_gem_object_lookup(file, args->handle);
672 bo = to_tegra_bo(gem);
674 switch (bo->tiling.mode) {
675 case TEGRA_BO_TILING_MODE_PITCH:
676 args->mode = DRM_TEGRA_GEM_TILING_MODE_PITCH;
680 case TEGRA_BO_TILING_MODE_TILED:
681 args->mode = DRM_TEGRA_GEM_TILING_MODE_TILED;
685 case TEGRA_BO_TILING_MODE_BLOCK:
686 args->mode = DRM_TEGRA_GEM_TILING_MODE_BLOCK;
687 args->value = bo->tiling.value;
695 drm_gem_object_put(gem);
700 static int tegra_gem_set_flags(struct drm_device *drm, void *data,
701 struct drm_file *file)
703 struct drm_tegra_gem_set_flags *args = data;
704 struct drm_gem_object *gem;
707 if (args->flags & ~DRM_TEGRA_GEM_FLAGS)
710 gem = drm_gem_object_lookup(file, args->handle);
714 bo = to_tegra_bo(gem);
717 if (args->flags & DRM_TEGRA_GEM_BOTTOM_UP)
718 bo->flags |= TEGRA_BO_BOTTOM_UP;
720 drm_gem_object_put(gem);
725 static int tegra_gem_get_flags(struct drm_device *drm, void *data,
726 struct drm_file *file)
728 struct drm_tegra_gem_get_flags *args = data;
729 struct drm_gem_object *gem;
732 gem = drm_gem_object_lookup(file, args->handle);
736 bo = to_tegra_bo(gem);
739 if (bo->flags & TEGRA_BO_BOTTOM_UP)
740 args->flags |= DRM_TEGRA_GEM_BOTTOM_UP;
742 drm_gem_object_put(gem);
748 static const struct drm_ioctl_desc tegra_drm_ioctls[] = {
749 #ifdef CONFIG_DRM_TEGRA_STAGING
750 DRM_IOCTL_DEF_DRV(TEGRA_CHANNEL_OPEN, tegra_drm_ioctl_channel_open,
752 DRM_IOCTL_DEF_DRV(TEGRA_CHANNEL_CLOSE, tegra_drm_ioctl_channel_close,
754 DRM_IOCTL_DEF_DRV(TEGRA_CHANNEL_MAP, tegra_drm_ioctl_channel_map,
756 DRM_IOCTL_DEF_DRV(TEGRA_CHANNEL_UNMAP, tegra_drm_ioctl_channel_unmap,
758 DRM_IOCTL_DEF_DRV(TEGRA_CHANNEL_SUBMIT, tegra_drm_ioctl_channel_submit,
760 DRM_IOCTL_DEF_DRV(TEGRA_SYNCPOINT_ALLOCATE, tegra_drm_ioctl_syncpoint_allocate,
762 DRM_IOCTL_DEF_DRV(TEGRA_SYNCPOINT_FREE, tegra_drm_ioctl_syncpoint_free,
764 DRM_IOCTL_DEF_DRV(TEGRA_SYNCPOINT_WAIT, tegra_drm_ioctl_syncpoint_wait,
767 DRM_IOCTL_DEF_DRV(TEGRA_GEM_CREATE, tegra_gem_create, DRM_RENDER_ALLOW),
768 DRM_IOCTL_DEF_DRV(TEGRA_GEM_MMAP, tegra_gem_mmap, DRM_RENDER_ALLOW),
769 DRM_IOCTL_DEF_DRV(TEGRA_SYNCPT_READ, tegra_syncpt_read,
771 DRM_IOCTL_DEF_DRV(TEGRA_SYNCPT_INCR, tegra_syncpt_incr,
773 DRM_IOCTL_DEF_DRV(TEGRA_SYNCPT_WAIT, tegra_syncpt_wait,
775 DRM_IOCTL_DEF_DRV(TEGRA_OPEN_CHANNEL, tegra_open_channel,
777 DRM_IOCTL_DEF_DRV(TEGRA_CLOSE_CHANNEL, tegra_close_channel,
779 DRM_IOCTL_DEF_DRV(TEGRA_GET_SYNCPT, tegra_get_syncpt,
781 DRM_IOCTL_DEF_DRV(TEGRA_SUBMIT, tegra_submit,
783 DRM_IOCTL_DEF_DRV(TEGRA_GET_SYNCPT_BASE, tegra_get_syncpt_base,
785 DRM_IOCTL_DEF_DRV(TEGRA_GEM_SET_TILING, tegra_gem_set_tiling,
787 DRM_IOCTL_DEF_DRV(TEGRA_GEM_GET_TILING, tegra_gem_get_tiling,
789 DRM_IOCTL_DEF_DRV(TEGRA_GEM_SET_FLAGS, tegra_gem_set_flags,
791 DRM_IOCTL_DEF_DRV(TEGRA_GEM_GET_FLAGS, tegra_gem_get_flags,
796 static const struct file_operations tegra_drm_fops = {
797 .owner = THIS_MODULE,
799 .release = drm_release,
800 .unlocked_ioctl = drm_ioctl,
801 .mmap = tegra_drm_mmap,
804 .compat_ioctl = drm_compat_ioctl,
805 .llseek = noop_llseek,
808 static int tegra_drm_context_cleanup(int id, void *p, void *data)
810 struct tegra_drm_context *context = p;
812 tegra_drm_context_free(context);
817 static void tegra_drm_postclose(struct drm_device *drm, struct drm_file *file)
819 struct tegra_drm_file *fpriv = file->driver_priv;
821 mutex_lock(&fpriv->lock);
822 idr_for_each(&fpriv->legacy_contexts, tegra_drm_context_cleanup, NULL);
823 tegra_drm_uapi_close_file(fpriv);
824 mutex_unlock(&fpriv->lock);
826 idr_destroy(&fpriv->legacy_contexts);
827 mutex_destroy(&fpriv->lock);
831 #ifdef CONFIG_DEBUG_FS
832 static int tegra_debugfs_framebuffers(struct seq_file *s, void *data)
834 struct drm_info_node *node = (struct drm_info_node *)s->private;
835 struct drm_device *drm = node->minor->dev;
836 struct drm_framebuffer *fb;
838 mutex_lock(&drm->mode_config.fb_lock);
840 list_for_each_entry(fb, &drm->mode_config.fb_list, head) {
841 seq_printf(s, "%3d: user size: %d x %d, depth %d, %d bpp, refcount %d\n",
842 fb->base.id, fb->width, fb->height,
844 fb->format->cpp[0] * 8,
845 drm_framebuffer_read_refcount(fb));
848 mutex_unlock(&drm->mode_config.fb_lock);
853 static int tegra_debugfs_iova(struct seq_file *s, void *data)
855 struct drm_info_node *node = (struct drm_info_node *)s->private;
856 struct drm_device *drm = node->minor->dev;
857 struct tegra_drm *tegra = drm->dev_private;
858 struct drm_printer p = drm_seq_file_printer(s);
861 mutex_lock(&tegra->mm_lock);
862 drm_mm_print(&tegra->mm, &p);
863 mutex_unlock(&tegra->mm_lock);
869 static struct drm_info_list tegra_debugfs_list[] = {
870 { "framebuffers", tegra_debugfs_framebuffers, 0 },
871 { "iova", tegra_debugfs_iova, 0 },
874 static void tegra_debugfs_init(struct drm_minor *minor)
876 drm_debugfs_create_files(tegra_debugfs_list,
877 ARRAY_SIZE(tegra_debugfs_list),
878 minor->debugfs_root, minor);
882 static const struct drm_driver tegra_drm_driver = {
883 .driver_features = DRIVER_MODESET | DRIVER_GEM |
884 DRIVER_ATOMIC | DRIVER_RENDER | DRIVER_SYNCOBJ,
885 .open = tegra_drm_open,
886 .postclose = tegra_drm_postclose,
887 .lastclose = drm_fb_helper_lastclose,
889 #if defined(CONFIG_DEBUG_FS)
890 .debugfs_init = tegra_debugfs_init,
893 .prime_handle_to_fd = drm_gem_prime_handle_to_fd,
894 .prime_fd_to_handle = drm_gem_prime_fd_to_handle,
895 .gem_prime_import = tegra_gem_prime_import,
897 .dumb_create = tegra_bo_dumb_create,
899 .ioctls = tegra_drm_ioctls,
900 .num_ioctls = ARRAY_SIZE(tegra_drm_ioctls),
901 .fops = &tegra_drm_fops,
906 .major = DRIVER_MAJOR,
907 .minor = DRIVER_MINOR,
908 .patchlevel = DRIVER_PATCHLEVEL,
911 int tegra_drm_register_client(struct tegra_drm *tegra,
912 struct tegra_drm_client *client)
915 * When MLOCKs are implemented, change to allocate a shared channel
916 * only when MLOCKs are disabled.
918 client->shared_channel = host1x_channel_request(&client->base);
919 if (!client->shared_channel)
922 mutex_lock(&tegra->clients_lock);
923 list_add_tail(&client->list, &tegra->clients);
925 mutex_unlock(&tegra->clients_lock);
930 int tegra_drm_unregister_client(struct tegra_drm *tegra,
931 struct tegra_drm_client *client)
933 mutex_lock(&tegra->clients_lock);
934 list_del_init(&client->list);
936 mutex_unlock(&tegra->clients_lock);
938 if (client->shared_channel)
939 host1x_channel_put(client->shared_channel);
944 int host1x_client_iommu_attach(struct host1x_client *client)
946 struct iommu_domain *domain = iommu_get_domain_for_dev(client->dev);
947 struct drm_device *drm = dev_get_drvdata(client->host);
948 struct tegra_drm *tegra = drm->dev_private;
949 struct iommu_group *group = NULL;
952 #if IS_ENABLED(CONFIG_ARM_DMA_USE_IOMMU)
953 if (client->dev->archdata.mapping) {
954 struct dma_iommu_mapping *mapping =
955 to_dma_iommu_mapping(client->dev);
956 arm_iommu_detach_device(client->dev);
957 arm_iommu_release_mapping(mapping);
959 domain = iommu_get_domain_for_dev(client->dev);
964 * If the host1x client is already attached to an IOMMU domain that is
965 * not the shared IOMMU domain, don't try to attach it to a different
966 * domain. This allows using the IOMMU-backed DMA API.
968 if (domain && domain != tegra->domain)
972 group = iommu_group_get(client->dev);
976 if (domain != tegra->domain) {
977 err = iommu_attach_group(tegra->domain, group);
979 iommu_group_put(group);
984 tegra->use_explicit_iommu = true;
987 client->group = group;
992 void host1x_client_iommu_detach(struct host1x_client *client)
994 struct drm_device *drm = dev_get_drvdata(client->host);
995 struct tegra_drm *tegra = drm->dev_private;
996 struct iommu_domain *domain;
1000 * Devices that are part of the same group may no longer be
1001 * attached to a domain at this point because their group may
1002 * have been detached by an earlier client.
1004 domain = iommu_get_domain_for_dev(client->dev);
1006 iommu_detach_group(tegra->domain, client->group);
1008 iommu_group_put(client->group);
1009 client->group = NULL;
1013 void *tegra_drm_alloc(struct tegra_drm *tegra, size_t size, dma_addr_t *dma)
1021 size = iova_align(&tegra->carveout.domain, size);
1023 size = PAGE_ALIGN(size);
1025 gfp = GFP_KERNEL | __GFP_ZERO;
1026 if (!tegra->domain) {
1028 * Many units only support 32-bit addresses, even on 64-bit
1029 * SoCs. If there is no IOMMU to translate into a 32-bit IO
1030 * virtual address space, force allocations to be in the
1031 * lower 32-bit range.
1036 virt = (void *)__get_free_pages(gfp, get_order(size));
1038 return ERR_PTR(-ENOMEM);
1040 if (!tegra->domain) {
1042 * If IOMMU is disabled, devices address physical memory
1045 *dma = virt_to_phys(virt);
1049 alloc = alloc_iova(&tegra->carveout.domain,
1050 size >> tegra->carveout.shift,
1051 tegra->carveout.limit, true);
1057 *dma = iova_dma_addr(&tegra->carveout.domain, alloc);
1058 err = iommu_map(tegra->domain, *dma, virt_to_phys(virt),
1059 size, IOMMU_READ | IOMMU_WRITE);
1066 __free_iova(&tegra->carveout.domain, alloc);
1068 free_pages((unsigned long)virt, get_order(size));
1070 return ERR_PTR(err);
1073 void tegra_drm_free(struct tegra_drm *tegra, size_t size, void *virt,
1077 size = iova_align(&tegra->carveout.domain, size);
1079 size = PAGE_ALIGN(size);
1081 if (tegra->domain) {
1082 iommu_unmap(tegra->domain, dma, size);
1083 free_iova(&tegra->carveout.domain,
1084 iova_pfn(&tegra->carveout.domain, dma));
1087 free_pages((unsigned long)virt, get_order(size));
1090 static bool host1x_drm_wants_iommu(struct host1x_device *dev)
1092 struct host1x *host1x = dev_get_drvdata(dev->dev.parent);
1093 struct iommu_domain *domain;
1096 * If the Tegra DRM clients are backed by an IOMMU, push buffers are
1097 * likely to be allocated beyond the 32-bit boundary if sufficient
1098 * system memory is available. This is problematic on earlier Tegra
1099 * generations where host1x supports a maximum of 32 address bits in
1100 * the GATHER opcode. In this case, unless host1x is behind an IOMMU
1101 * as well it won't be able to process buffers allocated beyond the
1104 * The DMA API will use bounce buffers in this case, so that could
1105 * perhaps still be made to work, even if less efficient, but there
1106 * is another catch: in order to perform cache maintenance on pages
1107 * allocated for discontiguous buffers we need to map and unmap the
1108 * SG table representing these buffers. This is fine for something
1109 * small like a push buffer, but it exhausts the bounce buffer pool
1110 * (typically on the order of a few MiB) for framebuffers (many MiB
1111 * for any modern resolution).
1113 * Work around this by making sure that Tegra DRM clients only use
1114 * an IOMMU if the parent host1x also uses an IOMMU.
1116 * Note that there's still a small gap here that we don't cover: if
1117 * the DMA API is backed by an IOMMU there's no way to control which
1118 * device is attached to an IOMMU and which isn't, except via wiring
1119 * up the device tree appropriately. This is considered an problem
1120 * of integration, so care must be taken for the DT to be consistent.
1122 domain = iommu_get_domain_for_dev(dev->dev.parent);
1125 * Tegra20 and Tegra30 don't support addressing memory beyond the
1126 * 32-bit boundary, so the regular GATHER opcodes will always be
1127 * sufficient and whether or not the host1x is attached to an IOMMU
1130 if (!domain && host1x_get_dma_mask(host1x) <= DMA_BIT_MASK(32))
1133 return domain != NULL;
1136 static int host1x_drm_probe(struct host1x_device *dev)
1138 struct tegra_drm *tegra;
1139 struct drm_device *drm;
1142 drm = drm_dev_alloc(&tegra_drm_driver, &dev->dev);
1144 return PTR_ERR(drm);
1146 tegra = kzalloc(sizeof(*tegra), GFP_KERNEL);
1152 if (host1x_drm_wants_iommu(dev) && iommu_present(&platform_bus_type)) {
1153 tegra->domain = iommu_domain_alloc(&platform_bus_type);
1154 if (!tegra->domain) {
1159 err = iova_cache_get();
1164 mutex_init(&tegra->clients_lock);
1165 INIT_LIST_HEAD(&tegra->clients);
1167 dev_set_drvdata(&dev->dev, drm);
1168 drm->dev_private = tegra;
1171 drm_mode_config_init(drm);
1173 drm->mode_config.min_width = 0;
1174 drm->mode_config.min_height = 0;
1175 drm->mode_config.max_width = 0;
1176 drm->mode_config.max_height = 0;
1178 drm->mode_config.normalize_zpos = true;
1180 drm->mode_config.funcs = &tegra_drm_mode_config_funcs;
1181 drm->mode_config.helper_private = &tegra_drm_mode_config_helpers;
1183 err = tegra_drm_fb_prepare(drm);
1187 drm_kms_helper_poll_init(drm);
1189 err = host1x_device_init(dev);
1194 * Now that all display controller have been initialized, the maximum
1195 * supported resolution is known and the bitmask for horizontal and
1196 * vertical bitfields can be computed.
1198 tegra->hmask = drm->mode_config.max_width - 1;
1199 tegra->vmask = drm->mode_config.max_height - 1;
1201 if (tegra->use_explicit_iommu) {
1202 u64 carveout_start, carveout_end, gem_start, gem_end;
1203 u64 dma_mask = dma_get_mask(&dev->dev);
1204 dma_addr_t start, end;
1205 unsigned long order;
1207 start = tegra->domain->geometry.aperture_start & dma_mask;
1208 end = tegra->domain->geometry.aperture_end & dma_mask;
1211 gem_end = end - CARVEOUT_SZ;
1212 carveout_start = gem_end + 1;
1215 order = __ffs(tegra->domain->pgsize_bitmap);
1216 init_iova_domain(&tegra->carveout.domain, 1UL << order,
1217 carveout_start >> order);
1219 tegra->carveout.shift = iova_shift(&tegra->carveout.domain);
1220 tegra->carveout.limit = carveout_end >> tegra->carveout.shift;
1222 drm_mm_init(&tegra->mm, gem_start, gem_end - gem_start + 1);
1223 mutex_init(&tegra->mm_lock);
1225 DRM_DEBUG_DRIVER("IOMMU apertures:\n");
1226 DRM_DEBUG_DRIVER(" GEM: %#llx-%#llx\n", gem_start, gem_end);
1227 DRM_DEBUG_DRIVER(" Carveout: %#llx-%#llx\n", carveout_start,
1229 } else if (tegra->domain) {
1230 iommu_domain_free(tegra->domain);
1231 tegra->domain = NULL;
1236 err = tegra_display_hub_prepare(tegra->hub);
1241 /* syncpoints are used for full 32-bit hardware VBLANK counters */
1242 drm->max_vblank_count = 0xffffffff;
1244 err = drm_vblank_init(drm, drm->mode_config.num_crtc);
1248 drm_mode_config_reset(drm);
1250 err = drm_aperture_remove_framebuffers(false, &tegra_drm_driver);
1254 err = tegra_drm_fb_init(drm);
1258 err = drm_dev_register(drm, 0);
1265 tegra_drm_fb_exit(drm);
1268 tegra_display_hub_cleanup(tegra->hub);
1270 if (tegra->domain) {
1271 mutex_destroy(&tegra->mm_lock);
1272 drm_mm_takedown(&tegra->mm);
1273 put_iova_domain(&tegra->carveout.domain);
1277 host1x_device_exit(dev);
1279 drm_kms_helper_poll_fini(drm);
1280 tegra_drm_fb_free(drm);
1282 drm_mode_config_cleanup(drm);
1285 iommu_domain_free(tegra->domain);
1293 static int host1x_drm_remove(struct host1x_device *dev)
1295 struct drm_device *drm = dev_get_drvdata(&dev->dev);
1296 struct tegra_drm *tegra = drm->dev_private;
1299 drm_dev_unregister(drm);
1301 drm_kms_helper_poll_fini(drm);
1302 tegra_drm_fb_exit(drm);
1303 drm_atomic_helper_shutdown(drm);
1304 drm_mode_config_cleanup(drm);
1307 tegra_display_hub_cleanup(tegra->hub);
1309 err = host1x_device_exit(dev);
1311 dev_err(&dev->dev, "host1x device cleanup failed: %d\n", err);
1313 if (tegra->domain) {
1314 mutex_destroy(&tegra->mm_lock);
1315 drm_mm_takedown(&tegra->mm);
1316 put_iova_domain(&tegra->carveout.domain);
1318 iommu_domain_free(tegra->domain);
1327 #ifdef CONFIG_PM_SLEEP
1328 static int host1x_drm_suspend(struct device *dev)
1330 struct drm_device *drm = dev_get_drvdata(dev);
1332 return drm_mode_config_helper_suspend(drm);
1335 static int host1x_drm_resume(struct device *dev)
1337 struct drm_device *drm = dev_get_drvdata(dev);
1339 return drm_mode_config_helper_resume(drm);
1343 static SIMPLE_DEV_PM_OPS(host1x_drm_pm_ops, host1x_drm_suspend,
1346 static const struct of_device_id host1x_drm_subdevs[] = {
1347 { .compatible = "nvidia,tegra20-dc", },
1348 { .compatible = "nvidia,tegra20-hdmi", },
1349 { .compatible = "nvidia,tegra20-gr2d", },
1350 { .compatible = "nvidia,tegra20-gr3d", },
1351 { .compatible = "nvidia,tegra30-dc", },
1352 { .compatible = "nvidia,tegra30-hdmi", },
1353 { .compatible = "nvidia,tegra30-gr2d", },
1354 { .compatible = "nvidia,tegra30-gr3d", },
1355 { .compatible = "nvidia,tegra114-dc", },
1356 { .compatible = "nvidia,tegra114-dsi", },
1357 { .compatible = "nvidia,tegra114-hdmi", },
1358 { .compatible = "nvidia,tegra114-gr2d", },
1359 { .compatible = "nvidia,tegra114-gr3d", },
1360 { .compatible = "nvidia,tegra124-dc", },
1361 { .compatible = "nvidia,tegra124-sor", },
1362 { .compatible = "nvidia,tegra124-hdmi", },
1363 { .compatible = "nvidia,tegra124-dsi", },
1364 { .compatible = "nvidia,tegra124-vic", },
1365 { .compatible = "nvidia,tegra132-dsi", },
1366 { .compatible = "nvidia,tegra210-dc", },
1367 { .compatible = "nvidia,tegra210-dsi", },
1368 { .compatible = "nvidia,tegra210-sor", },
1369 { .compatible = "nvidia,tegra210-sor1", },
1370 { .compatible = "nvidia,tegra210-vic", },
1371 { .compatible = "nvidia,tegra210-nvdec", },
1372 { .compatible = "nvidia,tegra186-display", },
1373 { .compatible = "nvidia,tegra186-dc", },
1374 { .compatible = "nvidia,tegra186-sor", },
1375 { .compatible = "nvidia,tegra186-sor1", },
1376 { .compatible = "nvidia,tegra186-vic", },
1377 { .compatible = "nvidia,tegra186-nvdec", },
1378 { .compatible = "nvidia,tegra194-display", },
1379 { .compatible = "nvidia,tegra194-dc", },
1380 { .compatible = "nvidia,tegra194-sor", },
1381 { .compatible = "nvidia,tegra194-vic", },
1382 { .compatible = "nvidia,tegra194-nvdec", },
1386 static struct host1x_driver host1x_drm_driver = {
1389 .pm = &host1x_drm_pm_ops,
1391 .probe = host1x_drm_probe,
1392 .remove = host1x_drm_remove,
1393 .subdevs = host1x_drm_subdevs,
1396 static struct platform_driver * const drivers[] = {
1397 &tegra_display_hub_driver,
1401 &tegra_dpaux_driver,
1406 &tegra_nvdec_driver,
1409 static int __init host1x_drm_init(void)
1413 err = host1x_driver_register(&host1x_drm_driver);
1417 err = platform_register_drivers(drivers, ARRAY_SIZE(drivers));
1419 goto unregister_host1x;
1424 host1x_driver_unregister(&host1x_drm_driver);
1427 module_init(host1x_drm_init);
1429 static void __exit host1x_drm_exit(void)
1431 platform_unregister_drivers(drivers, ARRAY_SIZE(drivers));
1432 host1x_driver_unregister(&host1x_drm_driver);
1434 module_exit(host1x_drm_exit);
1437 MODULE_DESCRIPTION("NVIDIA Tegra DRM driver");
1438 MODULE_LICENSE("GPL v2");