// SPDX-License-Identifier: GPL-2.0-only /* * Copyright (C) 2012 Avionic Design GmbH * Copyright (C) 2012-2016 NVIDIA CORPORATION. All rights reserved. */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "drm.h" #include "gem.h" #define DRIVER_NAME "tegra" #define DRIVER_DESC "NVIDIA Tegra graphics" #define DRIVER_DATE "20120330" #define DRIVER_MAJOR 0 #define DRIVER_MINOR 0 #define DRIVER_PATCHLEVEL 0 #define CARVEOUT_SZ SZ_64M #define CDMA_GATHER_FETCHES_MAX_NB 16383 struct tegra_drm_file { struct idr contexts; struct mutex lock; }; static int tegra_atomic_check(struct drm_device *drm, struct drm_atomic_state *state) { int err; err = drm_atomic_helper_check(drm, state); if (err < 0) return err; return tegra_display_hub_atomic_check(drm, state); } static const struct drm_mode_config_funcs tegra_drm_mode_config_funcs = { .fb_create = tegra_fb_create, #ifdef CONFIG_DRM_FBDEV_EMULATION .output_poll_changed = drm_fb_helper_output_poll_changed, #endif .atomic_check = tegra_atomic_check, .atomic_commit = drm_atomic_helper_commit, }; static void tegra_atomic_commit_tail(struct drm_atomic_state *old_state) { struct drm_device *drm = old_state->dev; struct tegra_drm *tegra = drm->dev_private; if (tegra->hub) { bool fence_cookie = dma_fence_begin_signalling(); drm_atomic_helper_commit_modeset_disables(drm, old_state); tegra_display_hub_atomic_commit(drm, old_state); drm_atomic_helper_commit_planes(drm, old_state, 0); drm_atomic_helper_commit_modeset_enables(drm, old_state); drm_atomic_helper_commit_hw_done(old_state); dma_fence_end_signalling(fence_cookie); drm_atomic_helper_wait_for_vblanks(drm, old_state); drm_atomic_helper_cleanup_planes(drm, old_state); } else { drm_atomic_helper_commit_tail_rpm(old_state); } } static const struct drm_mode_config_helper_funcs tegra_drm_mode_config_helpers = { .atomic_commit_tail = tegra_atomic_commit_tail, }; static int tegra_drm_open(struct drm_device *drm, struct drm_file *filp) { struct tegra_drm_file *fpriv; fpriv = kzalloc(sizeof(*fpriv), GFP_KERNEL); if (!fpriv) return -ENOMEM; idr_init_base(&fpriv->contexts, 1); mutex_init(&fpriv->lock); filp->driver_priv = fpriv; return 0; } static void tegra_drm_context_free(struct tegra_drm_context *context) { context->client->ops->close_channel(context); kfree(context); } static struct host1x_bo * host1x_bo_lookup(struct drm_file *file, u32 handle) { struct drm_gem_object *gem; struct tegra_bo *bo; gem = drm_gem_object_lookup(file, handle); if (!gem) return NULL; bo = to_tegra_bo(gem); return &bo->base; } static int host1x_reloc_copy_from_user(struct host1x_reloc *dest, struct drm_tegra_reloc __user *src, struct drm_device *drm, struct drm_file *file) { u32 cmdbuf, target; int err; err = get_user(cmdbuf, &src->cmdbuf.handle); if (err < 0) return err; err = get_user(dest->cmdbuf.offset, &src->cmdbuf.offset); if (err < 0) return err; err = get_user(target, &src->target.handle); if (err < 0) return err; err = get_user(dest->target.offset, &src->target.offset); if (err < 0) return err; err = get_user(dest->shift, &src->shift); if (err < 0) return err; dest->flags = HOST1X_RELOC_READ | HOST1X_RELOC_WRITE; dest->cmdbuf.bo = host1x_bo_lookup(file, cmdbuf); if (!dest->cmdbuf.bo) return -ENOENT; dest->target.bo = host1x_bo_lookup(file, target); if (!dest->target.bo) return -ENOENT; return 0; } int tegra_drm_submit(struct tegra_drm_context *context, struct drm_tegra_submit *args, struct drm_device *drm, struct drm_file *file) { struct host1x_client *client = &context->client->base; unsigned int num_cmdbufs = args->num_cmdbufs; unsigned int num_relocs = args->num_relocs; struct drm_tegra_cmdbuf __user *user_cmdbufs; struct drm_tegra_reloc __user *user_relocs; struct drm_tegra_syncpt __user *user_syncpt; struct drm_tegra_syncpt syncpt; struct host1x *host1x = dev_get_drvdata(drm->dev->parent); struct drm_gem_object **refs; struct host1x_syncpt *sp; struct host1x_job *job; unsigned int num_refs; int err; user_cmdbufs = u64_to_user_ptr(args->cmdbufs); user_relocs = u64_to_user_ptr(args->relocs); user_syncpt = u64_to_user_ptr(args->syncpts); /* We don't yet support other than one syncpt_incr struct per submit */ if (args->num_syncpts != 1) return -EINVAL; /* We don't yet support waitchks */ if (args->num_waitchks != 0) return -EINVAL; job = host1x_job_alloc(context->channel, args->num_cmdbufs, args->num_relocs); if (!job) return -ENOMEM; job->num_relocs = args->num_relocs; job->client = client; job->class = client->class; job->serialize = true; /* * Track referenced BOs so that they can be unreferenced after the * submission is complete. */ num_refs = num_cmdbufs + num_relocs * 2; refs = kmalloc_array(num_refs, sizeof(*refs), GFP_KERNEL); if (!refs) { err = -ENOMEM; goto put; } /* reuse as an iterator later */ num_refs = 0; while (num_cmdbufs) { struct drm_tegra_cmdbuf cmdbuf; struct host1x_bo *bo; struct tegra_bo *obj; u64 offset; if (copy_from_user(&cmdbuf, user_cmdbufs, sizeof(cmdbuf))) { err = -EFAULT; goto fail; } /* * The maximum number of CDMA gather fetches is 16383, a higher * value means the words count is malformed. */ if (cmdbuf.words > CDMA_GATHER_FETCHES_MAX_NB) { err = -EINVAL; goto fail; } bo = host1x_bo_lookup(file, cmdbuf.handle); if (!bo) { err = -ENOENT; goto fail; } offset = (u64)cmdbuf.offset + (u64)cmdbuf.words * sizeof(u32); obj = host1x_to_tegra_bo(bo); refs[num_refs++] = &obj->gem; /* * Gather buffer base address must be 4-bytes aligned, * unaligned offset is malformed and cause commands stream * corruption on the buffer address relocation. */ if (offset & 3 || offset > obj->gem.size) { err = -EINVAL; goto fail; } host1x_job_add_gather(job, bo, cmdbuf.words, cmdbuf.offset); num_cmdbufs--; user_cmdbufs++; } /* copy and resolve relocations from submit */ while (num_relocs--) { struct host1x_reloc *reloc; struct tegra_bo *obj; err = host1x_reloc_copy_from_user(&job->relocs[num_relocs], &user_relocs[num_relocs], drm, file); if (err < 0) goto fail; reloc = &job->relocs[num_relocs]; obj = host1x_to_tegra_bo(reloc->cmdbuf.bo); refs[num_refs++] = &obj->gem; /* * The unaligned cmdbuf offset will cause an unaligned write * during of the relocations patching, corrupting the commands * stream. */ if (reloc->cmdbuf.offset & 3 || reloc->cmdbuf.offset >= obj->gem.size) { err = -EINVAL; goto fail; } obj = host1x_to_tegra_bo(reloc->target.bo); refs[num_refs++] = &obj->gem; if (reloc->target.offset >= obj->gem.size) { err = -EINVAL; goto fail; } } if (copy_from_user(&syncpt, user_syncpt, sizeof(syncpt))) { err = -EFAULT; goto fail; } /* check whether syncpoint ID is valid */ sp = host1x_syncpt_get(host1x, syncpt.id); if (!sp) { err = -ENOENT; goto fail; } job->is_addr_reg = context->client->ops->is_addr_reg; job->is_valid_class = context->client->ops->is_valid_class; job->syncpt_incrs = syncpt.incrs; job->syncpt_id = syncpt.id; job->timeout = 10000; if (args->timeout && args->timeout < 10000) job->timeout = args->timeout; err = host1x_job_pin(job, context->client->base.dev); if (err) goto fail; err = host1x_job_submit(job); if (err) { host1x_job_unpin(job); goto fail; } args->fence = job->syncpt_end; fail: while (num_refs--) drm_gem_object_put(refs[num_refs]); kfree(refs); put: host1x_job_put(job); return err; } #ifdef CONFIG_DRM_TEGRA_STAGING static int tegra_gem_create(struct drm_device *drm, void *data, struct drm_file *file) { struct drm_tegra_gem_create *args = data; struct tegra_bo *bo; bo = tegra_bo_create_with_handle(file, drm, args->size, args->flags, &args->handle); if (IS_ERR(bo)) return PTR_ERR(bo); return 0; } static int tegra_gem_mmap(struct drm_device *drm, void *data, struct drm_file *file) { struct drm_tegra_gem_mmap *args = data; struct drm_gem_object *gem; struct tegra_bo *bo; gem = drm_gem_object_lookup(file, args->handle); if (!gem) return -EINVAL; bo = to_tegra_bo(gem); args->offset = drm_vma_node_offset_addr(&bo->gem.vma_node); drm_gem_object_put(gem); return 0; } static int tegra_syncpt_read(struct drm_device *drm, void *data, struct drm_file *file) { struct host1x *host = dev_get_drvdata(drm->dev->parent); struct drm_tegra_syncpt_read *args = data; struct host1x_syncpt *sp; sp = host1x_syncpt_get(host, args->id); if (!sp) return -EINVAL; args->value = host1x_syncpt_read_min(sp); return 0; } static int tegra_syncpt_incr(struct drm_device *drm, void *data, struct drm_file *file) { struct host1x *host1x = dev_get_drvdata(drm->dev->parent); struct drm_tegra_syncpt_incr *args = data; struct host1x_syncpt *sp; sp = host1x_syncpt_get(host1x, args->id); if (!sp) return -EINVAL; return host1x_syncpt_incr(sp); } static int tegra_syncpt_wait(struct drm_device *drm, void *data, struct drm_file *file) { struct host1x *host1x = dev_get_drvdata(drm->dev->parent); struct drm_tegra_syncpt_wait *args = data; struct host1x_syncpt *sp; sp = host1x_syncpt_get(host1x, args->id); if (!sp) return -EINVAL; return host1x_syncpt_wait(sp, args->thresh, msecs_to_jiffies(args->timeout), &args->value); } static int tegra_client_open(struct tegra_drm_file *fpriv, struct tegra_drm_client *client, struct tegra_drm_context *context) { int err; err = client->ops->open_channel(client, context); if (err < 0) return err; err = idr_alloc(&fpriv->contexts, context, 1, 0, GFP_KERNEL); if (err < 0) { client->ops->close_channel(context); return err; } context->client = client; context->id = err; return 0; } static int tegra_open_channel(struct drm_device *drm, void *data, struct drm_file *file) { struct tegra_drm_file *fpriv = file->driver_priv; struct tegra_drm *tegra = drm->dev_private; struct drm_tegra_open_channel *args = data; struct tegra_drm_context *context; struct tegra_drm_client *client; int err = -ENODEV; context = kzalloc(sizeof(*context), GFP_KERNEL); if (!context) return -ENOMEM; mutex_lock(&fpriv->lock); list_for_each_entry(client, &tegra->clients, list) if (client->base.class == args->client) { err = tegra_client_open(fpriv, client, context); if (err < 0) break; args->context = context->id; break; } if (err < 0) kfree(context); mutex_unlock(&fpriv->lock); return err; } static int tegra_close_channel(struct drm_device *drm, void *data, struct drm_file *file) { struct tegra_drm_file *fpriv = file->driver_priv; struct drm_tegra_close_channel *args = data; struct tegra_drm_context *context; int err = 0; mutex_lock(&fpriv->lock); context = idr_find(&fpriv->contexts, args->context); if (!context) { err = -EINVAL; goto unlock; } idr_remove(&fpriv->contexts, context->id); tegra_drm_context_free(context); unlock: mutex_unlock(&fpriv->lock); return err; } static int tegra_get_syncpt(struct drm_device *drm, void *data, struct drm_file *file) { struct tegra_drm_file *fpriv = file->driver_priv; struct drm_tegra_get_syncpt *args = data; struct tegra_drm_context *context; struct host1x_syncpt *syncpt; int err = 0; mutex_lock(&fpriv->lock); context = idr_find(&fpriv->contexts, args->context); if (!context) { err = -ENODEV; goto unlock; } if (args->index >= context->client->base.num_syncpts) { err = -EINVAL; goto unlock; } syncpt = context->client->base.syncpts[args->index]; args->id = host1x_syncpt_id(syncpt); unlock: mutex_unlock(&fpriv->lock); return err; } static int tegra_submit(struct drm_device *drm, void *data, struct drm_file *file) { struct tegra_drm_file *fpriv = file->driver_priv; struct drm_tegra_submit *args = data; struct tegra_drm_context *context; int err; mutex_lock(&fpriv->lock); context = idr_find(&fpriv->contexts, args->context); if (!context) { err = -ENODEV; goto unlock; } err = context->client->ops->submit(context, args, drm, file); unlock: mutex_unlock(&fpriv->lock); return err; } static int tegra_get_syncpt_base(struct drm_device *drm, void *data, struct drm_file *file) { struct tegra_drm_file *fpriv = file->driver_priv; struct drm_tegra_get_syncpt_base *args = data; struct tegra_drm_context *context; struct host1x_syncpt_base *base; struct host1x_syncpt *syncpt; int err = 0; mutex_lock(&fpriv->lock); context = idr_find(&fpriv->contexts, args->context); if (!context) { err = -ENODEV; goto unlock; } if (args->syncpt >= context->client->base.num_syncpts) { err = -EINVAL; goto unlock; } syncpt = context->client->base.syncpts[args->syncpt]; base = host1x_syncpt_get_base(syncpt); if (!base) { err = -ENXIO; goto unlock; } args->id = host1x_syncpt_base_id(base); unlock: mutex_unlock(&fpriv->lock); return err; } static int tegra_gem_set_tiling(struct drm_device *drm, void *data, struct drm_file *file) { struct drm_tegra_gem_set_tiling *args = data; enum tegra_bo_tiling_mode mode; struct drm_gem_object *gem; unsigned long value = 0; struct tegra_bo *bo; switch (args->mode) { case DRM_TEGRA_GEM_TILING_MODE_PITCH: mode = TEGRA_BO_TILING_MODE_PITCH; if (args->value != 0) return -EINVAL; break; case DRM_TEGRA_GEM_TILING_MODE_TILED: mode = TEGRA_BO_TILING_MODE_TILED; if (args->value != 0) return -EINVAL; break; case DRM_TEGRA_GEM_TILING_MODE_BLOCK: mode = TEGRA_BO_TILING_MODE_BLOCK; if (args->value > 5) return -EINVAL; value = args->value; break; default: return -EINVAL; } gem = drm_gem_object_lookup(file, args->handle); if (!gem) return -ENOENT; bo = to_tegra_bo(gem); bo->tiling.mode = mode; bo->tiling.value = value; drm_gem_object_put(gem); return 0; } static int tegra_gem_get_tiling(struct drm_device *drm, void *data, struct drm_file *file) { struct drm_tegra_gem_get_tiling *args = data; struct drm_gem_object *gem; struct tegra_bo *bo; int err = 0; gem = drm_gem_object_lookup(file, args->handle); if (!gem) return -ENOENT; bo = to_tegra_bo(gem); switch (bo->tiling.mode) { case TEGRA_BO_TILING_MODE_PITCH: args->mode = DRM_TEGRA_GEM_TILING_MODE_PITCH; args->value = 0; break; case TEGRA_BO_TILING_MODE_TILED: args->mode = DRM_TEGRA_GEM_TILING_MODE_TILED; args->value = 0; break; case TEGRA_BO_TILING_MODE_BLOCK: args->mode = DRM_TEGRA_GEM_TILING_MODE_BLOCK; args->value = bo->tiling.value; break; default: err = -EINVAL; break; } drm_gem_object_put(gem); return err; } static int tegra_gem_set_flags(struct drm_device *drm, void *data, struct drm_file *file) { struct drm_tegra_gem_set_flags *args = data; struct drm_gem_object *gem; struct tegra_bo *bo; if (args->flags & ~DRM_TEGRA_GEM_FLAGS) return -EINVAL; gem = drm_gem_object_lookup(file, args->handle); if (!gem) return -ENOENT; bo = to_tegra_bo(gem); bo->flags = 0; if (args->flags & DRM_TEGRA_GEM_BOTTOM_UP) bo->flags |= TEGRA_BO_BOTTOM_UP; drm_gem_object_put(gem); return 0; } static int tegra_gem_get_flags(struct drm_device *drm, void *data, struct drm_file *file) { struct drm_tegra_gem_get_flags *args = data; struct drm_gem_object *gem; struct tegra_bo *bo; gem = drm_gem_object_lookup(file, args->handle); if (!gem) return -ENOENT; bo = to_tegra_bo(gem); args->flags = 0; if (bo->flags & TEGRA_BO_BOTTOM_UP) args->flags |= DRM_TEGRA_GEM_BOTTOM_UP; drm_gem_object_put(gem); return 0; } #endif static const struct drm_ioctl_desc tegra_drm_ioctls[] = { #ifdef CONFIG_DRM_TEGRA_STAGING DRM_IOCTL_DEF_DRV(TEGRA_GEM_CREATE, tegra_gem_create, DRM_RENDER_ALLOW), DRM_IOCTL_DEF_DRV(TEGRA_GEM_MMAP, tegra_gem_mmap, DRM_RENDER_ALLOW), DRM_IOCTL_DEF_DRV(TEGRA_SYNCPT_READ, tegra_syncpt_read, DRM_RENDER_ALLOW), DRM_IOCTL_DEF_DRV(TEGRA_SYNCPT_INCR, tegra_syncpt_incr, DRM_RENDER_ALLOW), DRM_IOCTL_DEF_DRV(TEGRA_SYNCPT_WAIT, tegra_syncpt_wait, DRM_RENDER_ALLOW), DRM_IOCTL_DEF_DRV(TEGRA_OPEN_CHANNEL, tegra_open_channel, DRM_RENDER_ALLOW), DRM_IOCTL_DEF_DRV(TEGRA_CLOSE_CHANNEL, tegra_close_channel, DRM_RENDER_ALLOW), DRM_IOCTL_DEF_DRV(TEGRA_GET_SYNCPT, tegra_get_syncpt, DRM_RENDER_ALLOW), DRM_IOCTL_DEF_DRV(TEGRA_SUBMIT, tegra_submit, DRM_RENDER_ALLOW), DRM_IOCTL_DEF_DRV(TEGRA_GET_SYNCPT_BASE, tegra_get_syncpt_base, DRM_RENDER_ALLOW), DRM_IOCTL_DEF_DRV(TEGRA_GEM_SET_TILING, tegra_gem_set_tiling, DRM_RENDER_ALLOW), DRM_IOCTL_DEF_DRV(TEGRA_GEM_GET_TILING, tegra_gem_get_tiling, DRM_RENDER_ALLOW), DRM_IOCTL_DEF_DRV(TEGRA_GEM_SET_FLAGS, tegra_gem_set_flags, DRM_RENDER_ALLOW), DRM_IOCTL_DEF_DRV(TEGRA_GEM_GET_FLAGS, tegra_gem_get_flags, DRM_RENDER_ALLOW), #endif }; static const struct file_operations tegra_drm_fops = { .owner = THIS_MODULE, .open = drm_open, .release = drm_release, .unlocked_ioctl = drm_ioctl, .mmap = tegra_drm_mmap, .poll = drm_poll, .read = drm_read, .compat_ioctl = drm_compat_ioctl, .llseek = noop_llseek, }; static int tegra_drm_context_cleanup(int id, void *p, void *data) { struct tegra_drm_context *context = p; tegra_drm_context_free(context); return 0; } static void tegra_drm_postclose(struct drm_device *drm, struct drm_file *file) { struct tegra_drm_file *fpriv = file->driver_priv; mutex_lock(&fpriv->lock); idr_for_each(&fpriv->contexts, tegra_drm_context_cleanup, NULL); mutex_unlock(&fpriv->lock); idr_destroy(&fpriv->contexts); mutex_destroy(&fpriv->lock); kfree(fpriv); } #ifdef CONFIG_DEBUG_FS static int tegra_debugfs_framebuffers(struct seq_file *s, void *data) { struct drm_info_node *node = (struct drm_info_node *)s->private; struct drm_device *drm = node->minor->dev; struct drm_framebuffer *fb; mutex_lock(&drm->mode_config.fb_lock); list_for_each_entry(fb, &drm->mode_config.fb_list, head) { seq_printf(s, "%3d: user size: %d x %d, depth %d, %d bpp, refcount %d\n", fb->base.id, fb->width, fb->height, fb->format->depth, fb->format->cpp[0] * 8, drm_framebuffer_read_refcount(fb)); } mutex_unlock(&drm->mode_config.fb_lock); return 0; } static int tegra_debugfs_iova(struct seq_file *s, void *data) { struct drm_info_node *node = (struct drm_info_node *)s->private; struct drm_device *drm = node->minor->dev; struct tegra_drm *tegra = drm->dev_private; struct drm_printer p = drm_seq_file_printer(s); if (tegra->domain) { mutex_lock(&tegra->mm_lock); drm_mm_print(&tegra->mm, &p); mutex_unlock(&tegra->mm_lock); } return 0; } static struct drm_info_list tegra_debugfs_list[] = { { "framebuffers", tegra_debugfs_framebuffers, 0 }, { "iova", tegra_debugfs_iova, 0 }, }; static void tegra_debugfs_init(struct drm_minor *minor) { drm_debugfs_create_files(tegra_debugfs_list, ARRAY_SIZE(tegra_debugfs_list), minor->debugfs_root, minor); } #endif static const struct drm_driver tegra_drm_driver = { .driver_features = DRIVER_MODESET | DRIVER_GEM | DRIVER_ATOMIC | DRIVER_RENDER, .open = tegra_drm_open, .postclose = tegra_drm_postclose, .lastclose = drm_fb_helper_lastclose, #if defined(CONFIG_DEBUG_FS) .debugfs_init = tegra_debugfs_init, #endif .prime_handle_to_fd = drm_gem_prime_handle_to_fd, .prime_fd_to_handle = drm_gem_prime_fd_to_handle, .gem_prime_import = tegra_gem_prime_import, .dumb_create = tegra_bo_dumb_create, .ioctls = tegra_drm_ioctls, .num_ioctls = ARRAY_SIZE(tegra_drm_ioctls), .fops = &tegra_drm_fops, .name = DRIVER_NAME, .desc = DRIVER_DESC, .date = DRIVER_DATE, .major = DRIVER_MAJOR, .minor = DRIVER_MINOR, .patchlevel = DRIVER_PATCHLEVEL, }; int tegra_drm_register_client(struct tegra_drm *tegra, struct tegra_drm_client *client) { mutex_lock(&tegra->clients_lock); list_add_tail(&client->list, &tegra->clients); client->drm = tegra; mutex_unlock(&tegra->clients_lock); return 0; } int tegra_drm_unregister_client(struct tegra_drm *tegra, struct tegra_drm_client *client) { mutex_lock(&tegra->clients_lock); list_del_init(&client->list); client->drm = NULL; mutex_unlock(&tegra->clients_lock); return 0; } int host1x_client_iommu_attach(struct host1x_client *client) { struct iommu_domain *domain = iommu_get_domain_for_dev(client->dev); struct drm_device *drm = dev_get_drvdata(client->host); struct tegra_drm *tegra = drm->dev_private; struct iommu_group *group = NULL; int err; /* * If the host1x client is already attached to an IOMMU domain that is * not the shared IOMMU domain, don't try to attach it to a different * domain. This allows using the IOMMU-backed DMA API. */ if (domain && domain != tegra->domain) return 0; if (tegra->domain) { group = iommu_group_get(client->dev); if (!group) return -ENODEV; if (domain != tegra->domain) { err = iommu_attach_group(tegra->domain, group); if (err < 0) { iommu_group_put(group); return err; } } tegra->use_explicit_iommu = true; } client->group = group; return 0; } void host1x_client_iommu_detach(struct host1x_client *client) { struct drm_device *drm = dev_get_drvdata(client->host); struct tegra_drm *tegra = drm->dev_private; struct iommu_domain *domain; if (client->group) { /* * Devices that are part of the same group may no longer be * attached to a domain at this point because their group may * have been detached by an earlier client. */ domain = iommu_get_domain_for_dev(client->dev); if (domain) iommu_detach_group(tegra->domain, client->group); iommu_group_put(client->group); client->group = NULL; } } void *tegra_drm_alloc(struct tegra_drm *tegra, size_t size, dma_addr_t *dma) { struct iova *alloc; void *virt; gfp_t gfp; int err; if (tegra->domain) size = iova_align(&tegra->carveout.domain, size); else size = PAGE_ALIGN(size); gfp = GFP_KERNEL | __GFP_ZERO; if (!tegra->domain) { /* * Many units only support 32-bit addresses, even on 64-bit * SoCs. If there is no IOMMU to translate into a 32-bit IO * virtual address space, force allocations to be in the * lower 32-bit range. */ gfp |= GFP_DMA; } virt = (void *)__get_free_pages(gfp, get_order(size)); if (!virt) return ERR_PTR(-ENOMEM); if (!tegra->domain) { /* * If IOMMU is disabled, devices address physical memory * directly. */ *dma = virt_to_phys(virt); return virt; } alloc = alloc_iova(&tegra->carveout.domain, size >> tegra->carveout.shift, tegra->carveout.limit, true); if (!alloc) { err = -EBUSY; goto free_pages; } *dma = iova_dma_addr(&tegra->carveout.domain, alloc); err = iommu_map(tegra->domain, *dma, virt_to_phys(virt), size, IOMMU_READ | IOMMU_WRITE); if (err < 0) goto free_iova; return virt; free_iova: __free_iova(&tegra->carveout.domain, alloc); free_pages: free_pages((unsigned long)virt, get_order(size)); return ERR_PTR(err); } void tegra_drm_free(struct tegra_drm *tegra, size_t size, void *virt, dma_addr_t dma) { if (tegra->domain) size = iova_align(&tegra->carveout.domain, size); else size = PAGE_ALIGN(size); if (tegra->domain) { iommu_unmap(tegra->domain, dma, size); free_iova(&tegra->carveout.domain, iova_pfn(&tegra->carveout.domain, dma)); } free_pages((unsigned long)virt, get_order(size)); } static bool host1x_drm_wants_iommu(struct host1x_device *dev) { struct host1x *host1x = dev_get_drvdata(dev->dev.parent); struct iommu_domain *domain; /* * If the Tegra DRM clients are backed by an IOMMU, push buffers are * likely to be allocated beyond the 32-bit boundary if sufficient * system memory is available. This is problematic on earlier Tegra * generations where host1x supports a maximum of 32 address bits in * the GATHER opcode. In this case, unless host1x is behind an IOMMU * as well it won't be able to process buffers allocated beyond the * 32-bit boundary. * * The DMA API will use bounce buffers in this case, so that could * perhaps still be made to work, even if less efficient, but there * is another catch: in order to perform cache maintenance on pages * allocated for discontiguous buffers we need to map and unmap the * SG table representing these buffers. This is fine for something * small like a push buffer, but it exhausts the bounce buffer pool * (typically on the order of a few MiB) for framebuffers (many MiB * for any modern resolution). * * Work around this by making sure that Tegra DRM clients only use * an IOMMU if the parent host1x also uses an IOMMU. * * Note that there's still a small gap here that we don't cover: if * the DMA API is backed by an IOMMU there's no way to control which * device is attached to an IOMMU and which isn't, except via wiring * up the device tree appropriately. This is considered an problem * of integration, so care must be taken for the DT to be consistent. */ domain = iommu_get_domain_for_dev(dev->dev.parent); /* * Tegra20 and Tegra30 don't support addressing memory beyond the * 32-bit boundary, so the regular GATHER opcodes will always be * sufficient and whether or not the host1x is attached to an IOMMU * doesn't matter. */ if (!domain && host1x_get_dma_mask(host1x) <= DMA_BIT_MASK(32)) return true; return domain != NULL; } static int host1x_drm_probe(struct host1x_device *dev) { struct tegra_drm *tegra; struct drm_device *drm; int err; drm = drm_dev_alloc(&tegra_drm_driver, &dev->dev); if (IS_ERR(drm)) return PTR_ERR(drm); tegra = kzalloc(sizeof(*tegra), GFP_KERNEL); if (!tegra) { err = -ENOMEM; goto put; } if (host1x_drm_wants_iommu(dev) && iommu_present(&platform_bus_type)) { tegra->domain = iommu_domain_alloc(&platform_bus_type); if (!tegra->domain) { err = -ENOMEM; goto free; } err = iova_cache_get(); if (err < 0) goto domain; } mutex_init(&tegra->clients_lock); INIT_LIST_HEAD(&tegra->clients); dev_set_drvdata(&dev->dev, drm); drm->dev_private = tegra; tegra->drm = drm; drm_mode_config_init(drm); drm->mode_config.min_width = 0; drm->mode_config.min_height = 0; drm->mode_config.max_width = 4096; drm->mode_config.max_height = 4096; drm->mode_config.allow_fb_modifiers = true; drm->mode_config.normalize_zpos = true; drm->mode_config.funcs = &tegra_drm_mode_config_funcs; drm->mode_config.helper_private = &tegra_drm_mode_config_helpers; err = tegra_drm_fb_prepare(drm); if (err < 0) goto config; drm_kms_helper_poll_init(drm); err = host1x_device_init(dev); if (err < 0) goto fbdev; if (tegra->use_explicit_iommu) { u64 carveout_start, carveout_end, gem_start, gem_end; u64 dma_mask = dma_get_mask(&dev->dev); dma_addr_t start, end; unsigned long order; start = tegra->domain->geometry.aperture_start & dma_mask; end = tegra->domain->geometry.aperture_end & dma_mask; gem_start = start; gem_end = end - CARVEOUT_SZ; carveout_start = gem_end + 1; carveout_end = end; order = __ffs(tegra->domain->pgsize_bitmap); init_iova_domain(&tegra->carveout.domain, 1UL << order, carveout_start >> order); tegra->carveout.shift = iova_shift(&tegra->carveout.domain); tegra->carveout.limit = carveout_end >> tegra->carveout.shift; drm_mm_init(&tegra->mm, gem_start, gem_end - gem_start + 1); mutex_init(&tegra->mm_lock); DRM_DEBUG_DRIVER("IOMMU apertures:\n"); DRM_DEBUG_DRIVER(" GEM: %#llx-%#llx\n", gem_start, gem_end); DRM_DEBUG_DRIVER(" Carveout: %#llx-%#llx\n", carveout_start, carveout_end); } else if (tegra->domain) { iommu_domain_free(tegra->domain); tegra->domain = NULL; iova_cache_put(); } if (tegra->hub) { err = tegra_display_hub_prepare(tegra->hub); if (err < 0) goto device; } /* * We don't use the drm_irq_install() helpers provided by the DRM * core, so we need to set this manually in order to allow the * DRM_IOCTL_WAIT_VBLANK to operate correctly. */ drm->irq_enabled = true; /* syncpoints are used for full 32-bit hardware VBLANK counters */ drm->max_vblank_count = 0xffffffff; err = drm_vblank_init(drm, drm->mode_config.num_crtc); if (err < 0) goto hub; drm_mode_config_reset(drm); err = drm_fb_helper_remove_conflicting_framebuffers(NULL, "tegradrmfb", false); if (err < 0) goto hub; err = tegra_drm_fb_init(drm); if (err < 0) goto hub; err = drm_dev_register(drm, 0); if (err < 0) goto fb; return 0; fb: tegra_drm_fb_exit(drm); hub: if (tegra->hub) tegra_display_hub_cleanup(tegra->hub); device: if (tegra->domain) { mutex_destroy(&tegra->mm_lock); drm_mm_takedown(&tegra->mm); put_iova_domain(&tegra->carveout.domain); iova_cache_put(); } host1x_device_exit(dev); fbdev: drm_kms_helper_poll_fini(drm); tegra_drm_fb_free(drm); config: drm_mode_config_cleanup(drm); domain: if (tegra->domain) iommu_domain_free(tegra->domain); free: kfree(tegra); put: drm_dev_put(drm); return err; } static int host1x_drm_remove(struct host1x_device *dev) { struct drm_device *drm = dev_get_drvdata(&dev->dev); struct tegra_drm *tegra = drm->dev_private; int err; drm_dev_unregister(drm); drm_kms_helper_poll_fini(drm); tegra_drm_fb_exit(drm); drm_atomic_helper_shutdown(drm); drm_mode_config_cleanup(drm); if (tegra->hub) tegra_display_hub_cleanup(tegra->hub); err = host1x_device_exit(dev); if (err < 0) dev_err(&dev->dev, "host1x device cleanup failed: %d\n", err); if (tegra->domain) { mutex_destroy(&tegra->mm_lock); drm_mm_takedown(&tegra->mm); put_iova_domain(&tegra->carveout.domain); iova_cache_put(); iommu_domain_free(tegra->domain); } kfree(tegra); drm_dev_put(drm); return 0; } #ifdef CONFIG_PM_SLEEP static int host1x_drm_suspend(struct device *dev) { struct drm_device *drm = dev_get_drvdata(dev); return drm_mode_config_helper_suspend(drm); } static int host1x_drm_resume(struct device *dev) { struct drm_device *drm = dev_get_drvdata(dev); return drm_mode_config_helper_resume(drm); } #endif static SIMPLE_DEV_PM_OPS(host1x_drm_pm_ops, host1x_drm_suspend, host1x_drm_resume); static const struct of_device_id host1x_drm_subdevs[] = { { .compatible = "nvidia,tegra20-dc", }, { .compatible = "nvidia,tegra20-hdmi", }, { .compatible = "nvidia,tegra20-gr2d", }, { .compatible = "nvidia,tegra20-gr3d", }, { .compatible = "nvidia,tegra30-dc", }, { .compatible = "nvidia,tegra30-hdmi", }, { .compatible = "nvidia,tegra30-gr2d", }, { .compatible = "nvidia,tegra30-gr3d", }, { .compatible = "nvidia,tegra114-dc", }, { .compatible = "nvidia,tegra114-dsi", }, { .compatible = "nvidia,tegra114-hdmi", }, { .compatible = "nvidia,tegra114-gr2d", }, { .compatible = "nvidia,tegra114-gr3d", }, { .compatible = "nvidia,tegra124-dc", }, { .compatible = "nvidia,tegra124-sor", }, { .compatible = "nvidia,tegra124-hdmi", }, { .compatible = "nvidia,tegra124-dsi", }, { .compatible = "nvidia,tegra124-vic", }, { .compatible = "nvidia,tegra132-dsi", }, { .compatible = "nvidia,tegra210-dc", }, { .compatible = "nvidia,tegra210-dsi", }, { .compatible = "nvidia,tegra210-sor", }, { .compatible = "nvidia,tegra210-sor1", }, { .compatible = "nvidia,tegra210-vic", }, { .compatible = "nvidia,tegra186-display", }, { .compatible = "nvidia,tegra186-dc", }, { .compatible = "nvidia,tegra186-sor", }, { .compatible = "nvidia,tegra186-sor1", }, { .compatible = "nvidia,tegra186-vic", }, { .compatible = "nvidia,tegra194-display", }, { .compatible = "nvidia,tegra194-dc", }, { .compatible = "nvidia,tegra194-sor", }, { .compatible = "nvidia,tegra194-vic", }, { /* sentinel */ } }; static struct host1x_driver host1x_drm_driver = { .driver = { .name = "drm", .pm = &host1x_drm_pm_ops, }, .probe = host1x_drm_probe, .remove = host1x_drm_remove, .subdevs = host1x_drm_subdevs, }; static struct platform_driver * const drivers[] = { &tegra_display_hub_driver, &tegra_dc_driver, &tegra_hdmi_driver, &tegra_dsi_driver, &tegra_dpaux_driver, &tegra_sor_driver, &tegra_gr2d_driver, &tegra_gr3d_driver, &tegra_vic_driver, }; static int __init host1x_drm_init(void) { int err; err = host1x_driver_register(&host1x_drm_driver); if (err < 0) return err; err = platform_register_drivers(drivers, ARRAY_SIZE(drivers)); if (err < 0) goto unregister_host1x; return 0; unregister_host1x: host1x_driver_unregister(&host1x_drm_driver); return err; } module_init(host1x_drm_init); static void __exit host1x_drm_exit(void) { platform_unregister_drivers(drivers, ARRAY_SIZE(drivers)); host1x_driver_unregister(&host1x_drm_driver); } module_exit(host1x_drm_exit); MODULE_AUTHOR("Thierry Reding "); MODULE_DESCRIPTION("NVIDIA Tegra DRM driver"); MODULE_LICENSE("GPL v2");