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>
14 #include <drm/drm_atomic.h>
15 #include <drm/drm_atomic_helper.h>
16 #include <drm/drm_debugfs.h>
17 #include <drm/drm_drv.h>
18 #include <drm/drm_fourcc.h>
19 #include <drm/drm_ioctl.h>
20 #include <drm/drm_prime.h>
21 #include <drm/drm_vblank.h>
26 #define DRIVER_NAME "tegra"
27 #define DRIVER_DESC "NVIDIA Tegra graphics"
28 #define DRIVER_DATE "20120330"
29 #define DRIVER_MAJOR 0
30 #define DRIVER_MINOR 0
31 #define DRIVER_PATCHLEVEL 0
33 #define CARVEOUT_SZ SZ_64M
34 #define CDMA_GATHER_FETCHES_MAX_NB 16383
36 struct tegra_drm_file {
41 static int tegra_atomic_check(struct drm_device *drm,
42 struct drm_atomic_state *state)
46 err = drm_atomic_helper_check(drm, state);
50 return tegra_display_hub_atomic_check(drm, state);
53 static const struct drm_mode_config_funcs tegra_drm_mode_config_funcs = {
54 .fb_create = tegra_fb_create,
55 #ifdef CONFIG_DRM_FBDEV_EMULATION
56 .output_poll_changed = drm_fb_helper_output_poll_changed,
58 .atomic_check = tegra_atomic_check,
59 .atomic_commit = drm_atomic_helper_commit,
62 static void tegra_atomic_commit_tail(struct drm_atomic_state *old_state)
64 struct drm_device *drm = old_state->dev;
65 struct tegra_drm *tegra = drm->dev_private;
68 drm_atomic_helper_commit_modeset_disables(drm, old_state);
69 tegra_display_hub_atomic_commit(drm, old_state);
70 drm_atomic_helper_commit_planes(drm, old_state, 0);
71 drm_atomic_helper_commit_modeset_enables(drm, old_state);
72 drm_atomic_helper_commit_hw_done(old_state);
73 drm_atomic_helper_wait_for_vblanks(drm, old_state);
74 drm_atomic_helper_cleanup_planes(drm, old_state);
76 drm_atomic_helper_commit_tail_rpm(old_state);
80 static const struct drm_mode_config_helper_funcs
81 tegra_drm_mode_config_helpers = {
82 .atomic_commit_tail = tegra_atomic_commit_tail,
85 static int tegra_drm_open(struct drm_device *drm, struct drm_file *filp)
87 struct tegra_drm_file *fpriv;
89 fpriv = kzalloc(sizeof(*fpriv), GFP_KERNEL);
93 idr_init(&fpriv->contexts);
94 mutex_init(&fpriv->lock);
95 filp->driver_priv = fpriv;
100 static void tegra_drm_context_free(struct tegra_drm_context *context)
102 context->client->ops->close_channel(context);
106 static struct host1x_bo *
107 host1x_bo_lookup(struct drm_file *file, u32 handle)
109 struct drm_gem_object *gem;
112 gem = drm_gem_object_lookup(file, handle);
116 bo = to_tegra_bo(gem);
120 static int host1x_reloc_copy_from_user(struct host1x_reloc *dest,
121 struct drm_tegra_reloc __user *src,
122 struct drm_device *drm,
123 struct drm_file *file)
128 err = get_user(cmdbuf, &src->cmdbuf.handle);
132 err = get_user(dest->cmdbuf.offset, &src->cmdbuf.offset);
136 err = get_user(target, &src->target.handle);
140 err = get_user(dest->target.offset, &src->target.offset);
144 err = get_user(dest->shift, &src->shift);
148 dest->flags = HOST1X_RELOC_READ | HOST1X_RELOC_WRITE;
150 dest->cmdbuf.bo = host1x_bo_lookup(file, cmdbuf);
151 if (!dest->cmdbuf.bo)
154 dest->target.bo = host1x_bo_lookup(file, target);
155 if (!dest->target.bo)
161 int tegra_drm_submit(struct tegra_drm_context *context,
162 struct drm_tegra_submit *args, struct drm_device *drm,
163 struct drm_file *file)
165 struct host1x_client *client = &context->client->base;
166 unsigned int num_cmdbufs = args->num_cmdbufs;
167 unsigned int num_relocs = args->num_relocs;
168 struct drm_tegra_cmdbuf __user *user_cmdbufs;
169 struct drm_tegra_reloc __user *user_relocs;
170 struct drm_tegra_syncpt __user *user_syncpt;
171 struct drm_tegra_syncpt syncpt;
172 struct host1x *host1x = dev_get_drvdata(drm->dev->parent);
173 struct drm_gem_object **refs;
174 struct host1x_syncpt *sp;
175 struct host1x_job *job;
176 unsigned int num_refs;
179 user_cmdbufs = u64_to_user_ptr(args->cmdbufs);
180 user_relocs = u64_to_user_ptr(args->relocs);
181 user_syncpt = u64_to_user_ptr(args->syncpts);
183 /* We don't yet support other than one syncpt_incr struct per submit */
184 if (args->num_syncpts != 1)
187 /* We don't yet support waitchks */
188 if (args->num_waitchks != 0)
191 job = host1x_job_alloc(context->channel, args->num_cmdbufs,
196 job->num_relocs = args->num_relocs;
197 job->client = client;
198 job->class = client->class;
199 job->serialize = true;
202 * Track referenced BOs so that they can be unreferenced after the
203 * submission is complete.
205 num_refs = num_cmdbufs + num_relocs * 2;
207 refs = kmalloc_array(num_refs, sizeof(*refs), GFP_KERNEL);
213 /* reuse as an iterator later */
216 while (num_cmdbufs) {
217 struct drm_tegra_cmdbuf cmdbuf;
218 struct host1x_bo *bo;
219 struct tegra_bo *obj;
222 if (copy_from_user(&cmdbuf, user_cmdbufs, sizeof(cmdbuf))) {
228 * The maximum number of CDMA gather fetches is 16383, a higher
229 * value means the words count is malformed.
231 if (cmdbuf.words > CDMA_GATHER_FETCHES_MAX_NB) {
236 bo = host1x_bo_lookup(file, cmdbuf.handle);
242 offset = (u64)cmdbuf.offset + (u64)cmdbuf.words * sizeof(u32);
243 obj = host1x_to_tegra_bo(bo);
244 refs[num_refs++] = &obj->gem;
247 * Gather buffer base address must be 4-bytes aligned,
248 * unaligned offset is malformed and cause commands stream
249 * corruption on the buffer address relocation.
251 if (offset & 3 || offset > obj->gem.size) {
256 host1x_job_add_gather(job, bo, cmdbuf.words, cmdbuf.offset);
261 /* copy and resolve relocations from submit */
262 while (num_relocs--) {
263 struct host1x_reloc *reloc;
264 struct tegra_bo *obj;
266 err = host1x_reloc_copy_from_user(&job->relocs[num_relocs],
267 &user_relocs[num_relocs], drm,
272 reloc = &job->relocs[num_relocs];
273 obj = host1x_to_tegra_bo(reloc->cmdbuf.bo);
274 refs[num_refs++] = &obj->gem;
277 * The unaligned cmdbuf offset will cause an unaligned write
278 * during of the relocations patching, corrupting the commands
281 if (reloc->cmdbuf.offset & 3 ||
282 reloc->cmdbuf.offset >= obj->gem.size) {
287 obj = host1x_to_tegra_bo(reloc->target.bo);
288 refs[num_refs++] = &obj->gem;
290 if (reloc->target.offset >= obj->gem.size) {
296 if (copy_from_user(&syncpt, user_syncpt, sizeof(syncpt))) {
301 /* check whether syncpoint ID is valid */
302 sp = host1x_syncpt_get(host1x, syncpt.id);
308 job->is_addr_reg = context->client->ops->is_addr_reg;
309 job->is_valid_class = context->client->ops->is_valid_class;
310 job->syncpt_incrs = syncpt.incrs;
311 job->syncpt_id = syncpt.id;
312 job->timeout = 10000;
314 if (args->timeout && args->timeout < 10000)
315 job->timeout = args->timeout;
317 err = host1x_job_pin(job, context->client->base.dev);
321 err = host1x_job_submit(job);
323 host1x_job_unpin(job);
327 args->fence = job->syncpt_end;
331 drm_gem_object_put_unlocked(refs[num_refs]);
341 #ifdef CONFIG_DRM_TEGRA_STAGING
342 static int tegra_gem_create(struct drm_device *drm, void *data,
343 struct drm_file *file)
345 struct drm_tegra_gem_create *args = data;
348 bo = tegra_bo_create_with_handle(file, drm, args->size, args->flags,
356 static int tegra_gem_mmap(struct drm_device *drm, void *data,
357 struct drm_file *file)
359 struct drm_tegra_gem_mmap *args = data;
360 struct drm_gem_object *gem;
363 gem = drm_gem_object_lookup(file, args->handle);
367 bo = to_tegra_bo(gem);
369 args->offset = drm_vma_node_offset_addr(&bo->gem.vma_node);
371 drm_gem_object_put_unlocked(gem);
376 static int tegra_syncpt_read(struct drm_device *drm, void *data,
377 struct drm_file *file)
379 struct host1x *host = dev_get_drvdata(drm->dev->parent);
380 struct drm_tegra_syncpt_read *args = data;
381 struct host1x_syncpt *sp;
383 sp = host1x_syncpt_get(host, args->id);
387 args->value = host1x_syncpt_read_min(sp);
391 static int tegra_syncpt_incr(struct drm_device *drm, void *data,
392 struct drm_file *file)
394 struct host1x *host1x = dev_get_drvdata(drm->dev->parent);
395 struct drm_tegra_syncpt_incr *args = data;
396 struct host1x_syncpt *sp;
398 sp = host1x_syncpt_get(host1x, args->id);
402 return host1x_syncpt_incr(sp);
405 static int tegra_syncpt_wait(struct drm_device *drm, void *data,
406 struct drm_file *file)
408 struct host1x *host1x = dev_get_drvdata(drm->dev->parent);
409 struct drm_tegra_syncpt_wait *args = data;
410 struct host1x_syncpt *sp;
412 sp = host1x_syncpt_get(host1x, args->id);
416 return host1x_syncpt_wait(sp, args->thresh,
417 msecs_to_jiffies(args->timeout),
421 static int tegra_client_open(struct tegra_drm_file *fpriv,
422 struct tegra_drm_client *client,
423 struct tegra_drm_context *context)
427 err = client->ops->open_channel(client, context);
431 err = idr_alloc(&fpriv->contexts, context, 1, 0, GFP_KERNEL);
433 client->ops->close_channel(context);
437 context->client = client;
443 static int tegra_open_channel(struct drm_device *drm, void *data,
444 struct drm_file *file)
446 struct tegra_drm_file *fpriv = file->driver_priv;
447 struct tegra_drm *tegra = drm->dev_private;
448 struct drm_tegra_open_channel *args = data;
449 struct tegra_drm_context *context;
450 struct tegra_drm_client *client;
453 context = kzalloc(sizeof(*context), GFP_KERNEL);
457 mutex_lock(&fpriv->lock);
459 list_for_each_entry(client, &tegra->clients, list)
460 if (client->base.class == args->client) {
461 err = tegra_client_open(fpriv, client, context);
465 args->context = context->id;
472 mutex_unlock(&fpriv->lock);
476 static int tegra_close_channel(struct drm_device *drm, void *data,
477 struct drm_file *file)
479 struct tegra_drm_file *fpriv = file->driver_priv;
480 struct drm_tegra_close_channel *args = data;
481 struct tegra_drm_context *context;
484 mutex_lock(&fpriv->lock);
486 context = idr_find(&fpriv->contexts, args->context);
492 idr_remove(&fpriv->contexts, context->id);
493 tegra_drm_context_free(context);
496 mutex_unlock(&fpriv->lock);
500 static int tegra_get_syncpt(struct drm_device *drm, void *data,
501 struct drm_file *file)
503 struct tegra_drm_file *fpriv = file->driver_priv;
504 struct drm_tegra_get_syncpt *args = data;
505 struct tegra_drm_context *context;
506 struct host1x_syncpt *syncpt;
509 mutex_lock(&fpriv->lock);
511 context = idr_find(&fpriv->contexts, args->context);
517 if (args->index >= context->client->base.num_syncpts) {
522 syncpt = context->client->base.syncpts[args->index];
523 args->id = host1x_syncpt_id(syncpt);
526 mutex_unlock(&fpriv->lock);
530 static int tegra_submit(struct drm_device *drm, void *data,
531 struct drm_file *file)
533 struct tegra_drm_file *fpriv = file->driver_priv;
534 struct drm_tegra_submit *args = data;
535 struct tegra_drm_context *context;
538 mutex_lock(&fpriv->lock);
540 context = idr_find(&fpriv->contexts, args->context);
546 err = context->client->ops->submit(context, args, drm, file);
549 mutex_unlock(&fpriv->lock);
553 static int tegra_get_syncpt_base(struct drm_device *drm, void *data,
554 struct drm_file *file)
556 struct tegra_drm_file *fpriv = file->driver_priv;
557 struct drm_tegra_get_syncpt_base *args = data;
558 struct tegra_drm_context *context;
559 struct host1x_syncpt_base *base;
560 struct host1x_syncpt *syncpt;
563 mutex_lock(&fpriv->lock);
565 context = idr_find(&fpriv->contexts, args->context);
571 if (args->syncpt >= context->client->base.num_syncpts) {
576 syncpt = context->client->base.syncpts[args->syncpt];
578 base = host1x_syncpt_get_base(syncpt);
584 args->id = host1x_syncpt_base_id(base);
587 mutex_unlock(&fpriv->lock);
591 static int tegra_gem_set_tiling(struct drm_device *drm, void *data,
592 struct drm_file *file)
594 struct drm_tegra_gem_set_tiling *args = data;
595 enum tegra_bo_tiling_mode mode;
596 struct drm_gem_object *gem;
597 unsigned long value = 0;
600 switch (args->mode) {
601 case DRM_TEGRA_GEM_TILING_MODE_PITCH:
602 mode = TEGRA_BO_TILING_MODE_PITCH;
604 if (args->value != 0)
609 case DRM_TEGRA_GEM_TILING_MODE_TILED:
610 mode = TEGRA_BO_TILING_MODE_TILED;
612 if (args->value != 0)
617 case DRM_TEGRA_GEM_TILING_MODE_BLOCK:
618 mode = TEGRA_BO_TILING_MODE_BLOCK;
630 gem = drm_gem_object_lookup(file, args->handle);
634 bo = to_tegra_bo(gem);
636 bo->tiling.mode = mode;
637 bo->tiling.value = value;
639 drm_gem_object_put_unlocked(gem);
644 static int tegra_gem_get_tiling(struct drm_device *drm, void *data,
645 struct drm_file *file)
647 struct drm_tegra_gem_get_tiling *args = data;
648 struct drm_gem_object *gem;
652 gem = drm_gem_object_lookup(file, args->handle);
656 bo = to_tegra_bo(gem);
658 switch (bo->tiling.mode) {
659 case TEGRA_BO_TILING_MODE_PITCH:
660 args->mode = DRM_TEGRA_GEM_TILING_MODE_PITCH;
664 case TEGRA_BO_TILING_MODE_TILED:
665 args->mode = DRM_TEGRA_GEM_TILING_MODE_TILED;
669 case TEGRA_BO_TILING_MODE_BLOCK:
670 args->mode = DRM_TEGRA_GEM_TILING_MODE_BLOCK;
671 args->value = bo->tiling.value;
679 drm_gem_object_put_unlocked(gem);
684 static int tegra_gem_set_flags(struct drm_device *drm, void *data,
685 struct drm_file *file)
687 struct drm_tegra_gem_set_flags *args = data;
688 struct drm_gem_object *gem;
691 if (args->flags & ~DRM_TEGRA_GEM_FLAGS)
694 gem = drm_gem_object_lookup(file, args->handle);
698 bo = to_tegra_bo(gem);
701 if (args->flags & DRM_TEGRA_GEM_BOTTOM_UP)
702 bo->flags |= TEGRA_BO_BOTTOM_UP;
704 drm_gem_object_put_unlocked(gem);
709 static int tegra_gem_get_flags(struct drm_device *drm, void *data,
710 struct drm_file *file)
712 struct drm_tegra_gem_get_flags *args = data;
713 struct drm_gem_object *gem;
716 gem = drm_gem_object_lookup(file, args->handle);
720 bo = to_tegra_bo(gem);
723 if (bo->flags & TEGRA_BO_BOTTOM_UP)
724 args->flags |= DRM_TEGRA_GEM_BOTTOM_UP;
726 drm_gem_object_put_unlocked(gem);
732 static const struct drm_ioctl_desc tegra_drm_ioctls[] = {
733 #ifdef CONFIG_DRM_TEGRA_STAGING
734 DRM_IOCTL_DEF_DRV(TEGRA_GEM_CREATE, tegra_gem_create,
736 DRM_IOCTL_DEF_DRV(TEGRA_GEM_MMAP, tegra_gem_mmap,
738 DRM_IOCTL_DEF_DRV(TEGRA_SYNCPT_READ, tegra_syncpt_read,
740 DRM_IOCTL_DEF_DRV(TEGRA_SYNCPT_INCR, tegra_syncpt_incr,
742 DRM_IOCTL_DEF_DRV(TEGRA_SYNCPT_WAIT, tegra_syncpt_wait,
744 DRM_IOCTL_DEF_DRV(TEGRA_OPEN_CHANNEL, tegra_open_channel,
746 DRM_IOCTL_DEF_DRV(TEGRA_CLOSE_CHANNEL, tegra_close_channel,
748 DRM_IOCTL_DEF_DRV(TEGRA_GET_SYNCPT, tegra_get_syncpt,
750 DRM_IOCTL_DEF_DRV(TEGRA_SUBMIT, tegra_submit,
752 DRM_IOCTL_DEF_DRV(TEGRA_GET_SYNCPT_BASE, tegra_get_syncpt_base,
754 DRM_IOCTL_DEF_DRV(TEGRA_GEM_SET_TILING, tegra_gem_set_tiling,
756 DRM_IOCTL_DEF_DRV(TEGRA_GEM_GET_TILING, tegra_gem_get_tiling,
758 DRM_IOCTL_DEF_DRV(TEGRA_GEM_SET_FLAGS, tegra_gem_set_flags,
760 DRM_IOCTL_DEF_DRV(TEGRA_GEM_GET_FLAGS, tegra_gem_get_flags,
765 static const struct file_operations tegra_drm_fops = {
766 .owner = THIS_MODULE,
768 .release = drm_release,
769 .unlocked_ioctl = drm_ioctl,
770 .mmap = tegra_drm_mmap,
773 .compat_ioctl = drm_compat_ioctl,
774 .llseek = noop_llseek,
777 static int tegra_drm_context_cleanup(int id, void *p, void *data)
779 struct tegra_drm_context *context = p;
781 tegra_drm_context_free(context);
786 static void tegra_drm_postclose(struct drm_device *drm, struct drm_file *file)
788 struct tegra_drm_file *fpriv = file->driver_priv;
790 mutex_lock(&fpriv->lock);
791 idr_for_each(&fpriv->contexts, tegra_drm_context_cleanup, NULL);
792 mutex_unlock(&fpriv->lock);
794 idr_destroy(&fpriv->contexts);
795 mutex_destroy(&fpriv->lock);
799 #ifdef CONFIG_DEBUG_FS
800 static int tegra_debugfs_framebuffers(struct seq_file *s, void *data)
802 struct drm_info_node *node = (struct drm_info_node *)s->private;
803 struct drm_device *drm = node->minor->dev;
804 struct drm_framebuffer *fb;
806 mutex_lock(&drm->mode_config.fb_lock);
808 list_for_each_entry(fb, &drm->mode_config.fb_list, head) {
809 seq_printf(s, "%3d: user size: %d x %d, depth %d, %d bpp, refcount %d\n",
810 fb->base.id, fb->width, fb->height,
812 fb->format->cpp[0] * 8,
813 drm_framebuffer_read_refcount(fb));
816 mutex_unlock(&drm->mode_config.fb_lock);
821 static int tegra_debugfs_iova(struct seq_file *s, void *data)
823 struct drm_info_node *node = (struct drm_info_node *)s->private;
824 struct drm_device *drm = node->minor->dev;
825 struct tegra_drm *tegra = drm->dev_private;
826 struct drm_printer p = drm_seq_file_printer(s);
829 mutex_lock(&tegra->mm_lock);
830 drm_mm_print(&tegra->mm, &p);
831 mutex_unlock(&tegra->mm_lock);
837 static struct drm_info_list tegra_debugfs_list[] = {
838 { "framebuffers", tegra_debugfs_framebuffers, 0 },
839 { "iova", tegra_debugfs_iova, 0 },
842 static int tegra_debugfs_init(struct drm_minor *minor)
844 return drm_debugfs_create_files(tegra_debugfs_list,
845 ARRAY_SIZE(tegra_debugfs_list),
846 minor->debugfs_root, minor);
850 static struct drm_driver tegra_drm_driver = {
851 .driver_features = DRIVER_MODESET | DRIVER_GEM |
852 DRIVER_ATOMIC | DRIVER_RENDER,
853 .open = tegra_drm_open,
854 .postclose = tegra_drm_postclose,
855 .lastclose = drm_fb_helper_lastclose,
857 #if defined(CONFIG_DEBUG_FS)
858 .debugfs_init = tegra_debugfs_init,
861 .gem_free_object_unlocked = tegra_bo_free_object,
862 .gem_vm_ops = &tegra_bo_vm_ops,
864 .prime_handle_to_fd = drm_gem_prime_handle_to_fd,
865 .prime_fd_to_handle = drm_gem_prime_fd_to_handle,
866 .gem_prime_export = tegra_gem_prime_export,
867 .gem_prime_import = tegra_gem_prime_import,
869 .dumb_create = tegra_bo_dumb_create,
871 .ioctls = tegra_drm_ioctls,
872 .num_ioctls = ARRAY_SIZE(tegra_drm_ioctls),
873 .fops = &tegra_drm_fops,
878 .major = DRIVER_MAJOR,
879 .minor = DRIVER_MINOR,
880 .patchlevel = DRIVER_PATCHLEVEL,
883 int tegra_drm_register_client(struct tegra_drm *tegra,
884 struct tegra_drm_client *client)
886 mutex_lock(&tegra->clients_lock);
887 list_add_tail(&client->list, &tegra->clients);
889 mutex_unlock(&tegra->clients_lock);
894 int tegra_drm_unregister_client(struct tegra_drm *tegra,
895 struct tegra_drm_client *client)
897 mutex_lock(&tegra->clients_lock);
898 list_del_init(&client->list);
900 mutex_unlock(&tegra->clients_lock);
905 int host1x_client_iommu_attach(struct host1x_client *client)
907 struct iommu_domain *domain = iommu_get_domain_for_dev(client->dev);
908 struct drm_device *drm = dev_get_drvdata(client->host);
909 struct tegra_drm *tegra = drm->dev_private;
910 struct iommu_group *group = NULL;
914 * If the host1x client is already attached to an IOMMU domain that is
915 * not the shared IOMMU domain, don't try to attach it to a different
916 * domain. This allows using the IOMMU-backed DMA API.
918 if (domain && domain != tegra->domain)
922 group = iommu_group_get(client->dev);
926 if (domain != tegra->domain) {
927 err = iommu_attach_group(tegra->domain, group);
929 iommu_group_put(group);
934 tegra->use_explicit_iommu = true;
937 client->group = group;
942 void host1x_client_iommu_detach(struct host1x_client *client)
944 struct drm_device *drm = dev_get_drvdata(client->host);
945 struct tegra_drm *tegra = drm->dev_private;
946 struct iommu_domain *domain;
950 * Devices that are part of the same group may no longer be
951 * attached to a domain at this point because their group may
952 * have been detached by an earlier client.
954 domain = iommu_get_domain_for_dev(client->dev);
956 iommu_detach_group(tegra->domain, client->group);
958 iommu_group_put(client->group);
959 client->group = NULL;
963 void *tegra_drm_alloc(struct tegra_drm *tegra, size_t size, dma_addr_t *dma)
971 size = iova_align(&tegra->carveout.domain, size);
973 size = PAGE_ALIGN(size);
975 gfp = GFP_KERNEL | __GFP_ZERO;
976 if (!tegra->domain) {
978 * Many units only support 32-bit addresses, even on 64-bit
979 * SoCs. If there is no IOMMU to translate into a 32-bit IO
980 * virtual address space, force allocations to be in the
981 * lower 32-bit range.
986 virt = (void *)__get_free_pages(gfp, get_order(size));
988 return ERR_PTR(-ENOMEM);
990 if (!tegra->domain) {
992 * If IOMMU is disabled, devices address physical memory
995 *dma = virt_to_phys(virt);
999 alloc = alloc_iova(&tegra->carveout.domain,
1000 size >> tegra->carveout.shift,
1001 tegra->carveout.limit, true);
1007 *dma = iova_dma_addr(&tegra->carveout.domain, alloc);
1008 err = iommu_map(tegra->domain, *dma, virt_to_phys(virt),
1009 size, IOMMU_READ | IOMMU_WRITE);
1016 __free_iova(&tegra->carveout.domain, alloc);
1018 free_pages((unsigned long)virt, get_order(size));
1020 return ERR_PTR(err);
1023 void tegra_drm_free(struct tegra_drm *tegra, size_t size, void *virt,
1027 size = iova_align(&tegra->carveout.domain, size);
1029 size = PAGE_ALIGN(size);
1031 if (tegra->domain) {
1032 iommu_unmap(tegra->domain, dma, size);
1033 free_iova(&tegra->carveout.domain,
1034 iova_pfn(&tegra->carveout.domain, dma));
1037 free_pages((unsigned long)virt, get_order(size));
1040 static bool host1x_drm_wants_iommu(struct host1x_device *dev)
1042 struct iommu_domain *domain;
1045 * If the Tegra DRM clients are backed by an IOMMU, push buffers are
1046 * likely to be allocated beyond the 32-bit boundary if sufficient
1047 * system memory is available. This is problematic on earlier Tegra
1048 * generations where host1x supports a maximum of 32 address bits in
1049 * the GATHER opcode. In this case, unless host1x is behind an IOMMU
1050 * as well it won't be able to process buffers allocated beyond the
1053 * The DMA API will use bounce buffers in this case, so that could
1054 * perhaps still be made to work, even if less efficient, but there
1055 * is another catch: in order to perform cache maintenance on pages
1056 * allocated for discontiguous buffers we need to map and unmap the
1057 * SG table representing these buffers. This is fine for something
1058 * small like a push buffer, but it exhausts the bounce buffer pool
1059 * (typically on the order of a few MiB) for framebuffers (many MiB
1060 * for any modern resolution).
1062 * Work around this by making sure that Tegra DRM clients only use
1063 * an IOMMU if the parent host1x also uses an IOMMU.
1065 * Note that there's still a small gap here that we don't cover: if
1066 * the DMA API is backed by an IOMMU there's no way to control which
1067 * device is attached to an IOMMU and which isn't, except via wiring
1068 * up the device tree appropriately. This is considered an problem
1069 * of integration, so care must be taken for the DT to be consistent.
1071 domain = iommu_get_domain_for_dev(dev->dev.parent);
1074 * Tegra20 and Tegra30 don't support addressing memory beyond the
1075 * 32-bit boundary, so the regular GATHER opcodes will always be
1076 * sufficient and whether or not the host1x is attached to an IOMMU
1079 if (!domain && dma_get_mask(dev->dev.parent) <= DMA_BIT_MASK(32))
1082 return domain != NULL;
1085 static int host1x_drm_probe(struct host1x_device *dev)
1087 struct drm_driver *driver = &tegra_drm_driver;
1088 struct tegra_drm *tegra;
1089 struct drm_device *drm;
1092 drm = drm_dev_alloc(driver, &dev->dev);
1094 return PTR_ERR(drm);
1096 tegra = kzalloc(sizeof(*tegra), GFP_KERNEL);
1102 if (host1x_drm_wants_iommu(dev) && iommu_present(&platform_bus_type)) {
1103 tegra->domain = iommu_domain_alloc(&platform_bus_type);
1104 if (!tegra->domain) {
1109 err = iova_cache_get();
1114 mutex_init(&tegra->clients_lock);
1115 INIT_LIST_HEAD(&tegra->clients);
1117 dev_set_drvdata(&dev->dev, drm);
1118 drm->dev_private = tegra;
1121 drm_mode_config_init(drm);
1123 drm->mode_config.min_width = 0;
1124 drm->mode_config.min_height = 0;
1126 drm->mode_config.max_width = 4096;
1127 drm->mode_config.max_height = 4096;
1129 drm->mode_config.allow_fb_modifiers = true;
1131 drm->mode_config.normalize_zpos = true;
1133 drm->mode_config.funcs = &tegra_drm_mode_config_funcs;
1134 drm->mode_config.helper_private = &tegra_drm_mode_config_helpers;
1136 err = tegra_drm_fb_prepare(drm);
1140 drm_kms_helper_poll_init(drm);
1142 err = host1x_device_init(dev);
1146 if (tegra->use_explicit_iommu) {
1147 u64 carveout_start, carveout_end, gem_start, gem_end;
1148 u64 dma_mask = dma_get_mask(&dev->dev);
1149 dma_addr_t start, end;
1150 unsigned long order;
1152 start = tegra->domain->geometry.aperture_start & dma_mask;
1153 end = tegra->domain->geometry.aperture_end & dma_mask;
1156 gem_end = end - CARVEOUT_SZ;
1157 carveout_start = gem_end + 1;
1160 order = __ffs(tegra->domain->pgsize_bitmap);
1161 init_iova_domain(&tegra->carveout.domain, 1UL << order,
1162 carveout_start >> order);
1164 tegra->carveout.shift = iova_shift(&tegra->carveout.domain);
1165 tegra->carveout.limit = carveout_end >> tegra->carveout.shift;
1167 drm_mm_init(&tegra->mm, gem_start, gem_end - gem_start + 1);
1168 mutex_init(&tegra->mm_lock);
1170 DRM_DEBUG_DRIVER("IOMMU apertures:\n");
1171 DRM_DEBUG_DRIVER(" GEM: %#llx-%#llx\n", gem_start, gem_end);
1172 DRM_DEBUG_DRIVER(" Carveout: %#llx-%#llx\n", carveout_start,
1174 } else if (tegra->domain) {
1175 iommu_domain_free(tegra->domain);
1176 tegra->domain = NULL;
1181 err = tegra_display_hub_prepare(tegra->hub);
1187 * We don't use the drm_irq_install() helpers provided by the DRM
1188 * core, so we need to set this manually in order to allow the
1189 * DRM_IOCTL_WAIT_VBLANK to operate correctly.
1191 drm->irq_enabled = true;
1193 /* syncpoints are used for full 32-bit hardware VBLANK counters */
1194 drm->max_vblank_count = 0xffffffff;
1196 err = drm_vblank_init(drm, drm->mode_config.num_crtc);
1200 drm_mode_config_reset(drm);
1202 err = drm_fb_helper_remove_conflicting_framebuffers(NULL, "tegradrmfb",
1207 err = tegra_drm_fb_init(drm);
1211 err = drm_dev_register(drm, 0);
1218 tegra_drm_fb_exit(drm);
1221 tegra_display_hub_cleanup(tegra->hub);
1223 if (tegra->domain) {
1224 mutex_destroy(&tegra->mm_lock);
1225 drm_mm_takedown(&tegra->mm);
1226 put_iova_domain(&tegra->carveout.domain);
1230 host1x_device_exit(dev);
1232 drm_kms_helper_poll_fini(drm);
1233 tegra_drm_fb_free(drm);
1235 drm_mode_config_cleanup(drm);
1238 iommu_domain_free(tegra->domain);
1246 static int host1x_drm_remove(struct host1x_device *dev)
1248 struct drm_device *drm = dev_get_drvdata(&dev->dev);
1249 struct tegra_drm *tegra = drm->dev_private;
1252 drm_dev_unregister(drm);
1254 drm_kms_helper_poll_fini(drm);
1255 tegra_drm_fb_exit(drm);
1256 drm_atomic_helper_shutdown(drm);
1257 drm_mode_config_cleanup(drm);
1260 tegra_display_hub_cleanup(tegra->hub);
1262 err = host1x_device_exit(dev);
1264 dev_err(&dev->dev, "host1x device cleanup failed: %d\n", err);
1266 if (tegra->domain) {
1267 mutex_destroy(&tegra->mm_lock);
1268 drm_mm_takedown(&tegra->mm);
1269 put_iova_domain(&tegra->carveout.domain);
1271 iommu_domain_free(tegra->domain);
1280 #ifdef CONFIG_PM_SLEEP
1281 static int host1x_drm_suspend(struct device *dev)
1283 struct drm_device *drm = dev_get_drvdata(dev);
1285 return drm_mode_config_helper_suspend(drm);
1288 static int host1x_drm_resume(struct device *dev)
1290 struct drm_device *drm = dev_get_drvdata(dev);
1292 return drm_mode_config_helper_resume(drm);
1296 static SIMPLE_DEV_PM_OPS(host1x_drm_pm_ops, host1x_drm_suspend,
1299 static const struct of_device_id host1x_drm_subdevs[] = {
1300 { .compatible = "nvidia,tegra20-dc", },
1301 { .compatible = "nvidia,tegra20-hdmi", },
1302 { .compatible = "nvidia,tegra20-gr2d", },
1303 { .compatible = "nvidia,tegra20-gr3d", },
1304 { .compatible = "nvidia,tegra30-dc", },
1305 { .compatible = "nvidia,tegra30-hdmi", },
1306 { .compatible = "nvidia,tegra30-gr2d", },
1307 { .compatible = "nvidia,tegra30-gr3d", },
1308 { .compatible = "nvidia,tegra114-dsi", },
1309 { .compatible = "nvidia,tegra114-hdmi", },
1310 { .compatible = "nvidia,tegra114-gr3d", },
1311 { .compatible = "nvidia,tegra124-dc", },
1312 { .compatible = "nvidia,tegra124-sor", },
1313 { .compatible = "nvidia,tegra124-hdmi", },
1314 { .compatible = "nvidia,tegra124-dsi", },
1315 { .compatible = "nvidia,tegra124-vic", },
1316 { .compatible = "nvidia,tegra132-dsi", },
1317 { .compatible = "nvidia,tegra210-dc", },
1318 { .compatible = "nvidia,tegra210-dsi", },
1319 { .compatible = "nvidia,tegra210-sor", },
1320 { .compatible = "nvidia,tegra210-sor1", },
1321 { .compatible = "nvidia,tegra210-vic", },
1322 { .compatible = "nvidia,tegra186-display", },
1323 { .compatible = "nvidia,tegra186-dc", },
1324 { .compatible = "nvidia,tegra186-sor", },
1325 { .compatible = "nvidia,tegra186-sor1", },
1326 { .compatible = "nvidia,tegra186-vic", },
1327 { .compatible = "nvidia,tegra194-display", },
1328 { .compatible = "nvidia,tegra194-dc", },
1329 { .compatible = "nvidia,tegra194-sor", },
1330 { .compatible = "nvidia,tegra194-vic", },
1334 static struct host1x_driver host1x_drm_driver = {
1337 .pm = &host1x_drm_pm_ops,
1339 .probe = host1x_drm_probe,
1340 .remove = host1x_drm_remove,
1341 .subdevs = host1x_drm_subdevs,
1344 static struct platform_driver * const drivers[] = {
1345 &tegra_display_hub_driver,
1349 &tegra_dpaux_driver,
1356 static int __init host1x_drm_init(void)
1360 err = host1x_driver_register(&host1x_drm_driver);
1364 err = platform_register_drivers(drivers, ARRAY_SIZE(drivers));
1366 goto unregister_host1x;
1371 host1x_driver_unregister(&host1x_drm_driver);
1374 module_init(host1x_drm_init);
1376 static void __exit host1x_drm_exit(void)
1378 platform_unregister_drivers(drivers, ARRAY_SIZE(drivers));
1379 host1x_driver_unregister(&host1x_drm_driver);
1381 module_exit(host1x_drm_exit);
1384 MODULE_DESCRIPTION("NVIDIA Tegra DRM driver");
1385 MODULE_LICENSE("GPL v2");