// SPDX-License-Identifier: GPL-2.0 OR MIT /************************************************************************** * * Copyright 2011-2014 VMware, Inc., Palo Alto, CA., USA * * Permission is hereby granted, free of charge, to any person obtaining a * copy of this software and associated documentation files (the * "Software"), to deal in the Software without restriction, including * without limitation the rights to use, copy, modify, merge, publish, * distribute, sub license, and/or sell copies of the Software, and to * permit persons to whom the Software is furnished to do so, subject to * the following conditions: * * The above copyright notice and this permission notice (including the * next paragraph) shall be included in all copies or substantial portions * of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE * USE OR OTHER DEALINGS IN THE SOFTWARE. * **************************************************************************/ #include #include "vmwgfx_drv.h" #define VMW_FENCE_WRAP (1 << 31) struct vmw_fence_manager { int num_fence_objects; struct vmw_private *dev_priv; spinlock_t lock; struct list_head fence_list; struct work_struct work; u32 user_fence_size; u32 fence_size; u32 event_fence_action_size; bool fifo_down; struct list_head cleanup_list; uint32_t pending_actions[VMW_ACTION_MAX]; struct mutex goal_irq_mutex; bool goal_irq_on; /* Protected by @goal_irq_mutex */ bool seqno_valid; /* Protected by @lock, and may not be set to true without the @goal_irq_mutex held. */ u64 ctx; }; struct vmw_user_fence { struct ttm_base_object base; struct vmw_fence_obj fence; }; /** * struct vmw_event_fence_action - fence action that delivers a drm event. * * @action: A struct vmw_fence_action to hook up to a fence. * @event: A pointer to the pending event. * @fence: A referenced pointer to the fence to keep it alive while @action * hangs on it. * @dev: Pointer to a struct drm_device so we can access the event stuff. * @tv_sec: If non-null, the variable pointed to will be assigned * current time tv_sec val when the fence signals. * @tv_usec: Must be set if @tv_sec is set, and the variable pointed to will * be assigned the current time tv_usec val when the fence signals. */ struct vmw_event_fence_action { struct vmw_fence_action action; struct drm_pending_event *event; struct vmw_fence_obj *fence; struct drm_device *dev; uint32_t *tv_sec; uint32_t *tv_usec; }; static struct vmw_fence_manager * fman_from_fence(struct vmw_fence_obj *fence) { return container_of(fence->base.lock, struct vmw_fence_manager, lock); } static u32 vmw_fence_goal_read(struct vmw_private *vmw) { if ((vmw->capabilities2 & SVGA_CAP2_EXTRA_REGS) != 0) return vmw_read(vmw, SVGA_REG_FENCE_GOAL); else return vmw_fifo_mem_read(vmw, SVGA_FIFO_FENCE_GOAL); } static void vmw_fence_goal_write(struct vmw_private *vmw, u32 value) { if ((vmw->capabilities2 & SVGA_CAP2_EXTRA_REGS) != 0) vmw_write(vmw, SVGA_REG_FENCE_GOAL, value); else vmw_fifo_mem_write(vmw, SVGA_FIFO_FENCE_GOAL, value); } /* * Note on fencing subsystem usage of irqs: * Typically the vmw_fences_update function is called * * a) When a new fence seqno has been submitted by the fifo code. * b) On-demand when we have waiters. Sleeping waiters will switch on the * ANY_FENCE irq and call vmw_fences_update function each time an ANY_FENCE * irq is received. When the last fence waiter is gone, that IRQ is masked * away. * * In situations where there are no waiters and we don't submit any new fences, * fence objects may not be signaled. This is perfectly OK, since there are * no consumers of the signaled data, but that is NOT ok when there are fence * actions attached to a fence. The fencing subsystem then makes use of the * FENCE_GOAL irq and sets the fence goal seqno to that of the next fence * which has an action attached, and each time vmw_fences_update is called, * the subsystem makes sure the fence goal seqno is updated. * * The fence goal seqno irq is on as long as there are unsignaled fence * objects with actions attached to them. */ static void vmw_fence_obj_destroy(struct dma_fence *f) { struct vmw_fence_obj *fence = container_of(f, struct vmw_fence_obj, base); struct vmw_fence_manager *fman = fman_from_fence(fence); spin_lock(&fman->lock); list_del_init(&fence->head); --fman->num_fence_objects; spin_unlock(&fman->lock); fence->destroy(fence); } static const char *vmw_fence_get_driver_name(struct dma_fence *f) { return "vmwgfx"; } static const char *vmw_fence_get_timeline_name(struct dma_fence *f) { return "svga"; } static bool vmw_fence_enable_signaling(struct dma_fence *f) { struct vmw_fence_obj *fence = container_of(f, struct vmw_fence_obj, base); struct vmw_fence_manager *fman = fman_from_fence(fence); struct vmw_private *dev_priv = fman->dev_priv; u32 seqno = vmw_fence_read(dev_priv); if (seqno - fence->base.seqno < VMW_FENCE_WRAP) return false; return true; } struct vmwgfx_wait_cb { struct dma_fence_cb base; struct task_struct *task; }; static void vmwgfx_wait_cb(struct dma_fence *fence, struct dma_fence_cb *cb) { struct vmwgfx_wait_cb *wait = container_of(cb, struct vmwgfx_wait_cb, base); wake_up_process(wait->task); } static void __vmw_fences_update(struct vmw_fence_manager *fman); static long vmw_fence_wait(struct dma_fence *f, bool intr, signed long timeout) { struct vmw_fence_obj *fence = container_of(f, struct vmw_fence_obj, base); struct vmw_fence_manager *fman = fman_from_fence(fence); struct vmw_private *dev_priv = fman->dev_priv; struct vmwgfx_wait_cb cb; long ret = timeout; if (likely(vmw_fence_obj_signaled(fence))) return timeout; vmw_seqno_waiter_add(dev_priv); spin_lock(f->lock); if (test_bit(DMA_FENCE_FLAG_SIGNALED_BIT, &f->flags)) goto out; if (intr && signal_pending(current)) { ret = -ERESTARTSYS; goto out; } cb.base.func = vmwgfx_wait_cb; cb.task = current; list_add(&cb.base.node, &f->cb_list); for (;;) { __vmw_fences_update(fman); /* * We can use the barrier free __set_current_state() since * DMA_FENCE_FLAG_SIGNALED_BIT + wakeup is protected by the * fence spinlock. */ if (intr) __set_current_state(TASK_INTERRUPTIBLE); else __set_current_state(TASK_UNINTERRUPTIBLE); if (test_bit(DMA_FENCE_FLAG_SIGNALED_BIT, &f->flags)) { if (ret == 0 && timeout > 0) ret = 1; break; } if (intr && signal_pending(current)) { ret = -ERESTARTSYS; break; } if (ret == 0) break; spin_unlock(f->lock); ret = schedule_timeout(ret); spin_lock(f->lock); } __set_current_state(TASK_RUNNING); if (!list_empty(&cb.base.node)) list_del(&cb.base.node); out: spin_unlock(f->lock); vmw_seqno_waiter_remove(dev_priv); return ret; } static const struct dma_fence_ops vmw_fence_ops = { .get_driver_name = vmw_fence_get_driver_name, .get_timeline_name = vmw_fence_get_timeline_name, .enable_signaling = vmw_fence_enable_signaling, .wait = vmw_fence_wait, .release = vmw_fence_obj_destroy, }; /* * Execute signal actions on fences recently signaled. * This is done from a workqueue so we don't have to execute * signal actions from atomic context. */ static void vmw_fence_work_func(struct work_struct *work) { struct vmw_fence_manager *fman = container_of(work, struct vmw_fence_manager, work); struct list_head list; struct vmw_fence_action *action, *next_action; bool seqno_valid; do { INIT_LIST_HEAD(&list); mutex_lock(&fman->goal_irq_mutex); spin_lock(&fman->lock); list_splice_init(&fman->cleanup_list, &list); seqno_valid = fman->seqno_valid; spin_unlock(&fman->lock); if (!seqno_valid && fman->goal_irq_on) { fman->goal_irq_on = false; vmw_goal_waiter_remove(fman->dev_priv); } mutex_unlock(&fman->goal_irq_mutex); if (list_empty(&list)) return; /* * At this point, only we should be able to manipulate the * list heads of the actions we have on the private list. * hence fman::lock not held. */ list_for_each_entry_safe(action, next_action, &list, head) { list_del_init(&action->head); if (action->cleanup) action->cleanup(action); } } while (1); } struct vmw_fence_manager *vmw_fence_manager_init(struct vmw_private *dev_priv) { struct vmw_fence_manager *fman = kzalloc(sizeof(*fman), GFP_KERNEL); if (unlikely(!fman)) return NULL; fman->dev_priv = dev_priv; spin_lock_init(&fman->lock); INIT_LIST_HEAD(&fman->fence_list); INIT_LIST_HEAD(&fman->cleanup_list); INIT_WORK(&fman->work, &vmw_fence_work_func); fman->fifo_down = true; fman->user_fence_size = ttm_round_pot(sizeof(struct vmw_user_fence)) + TTM_OBJ_EXTRA_SIZE; fman->fence_size = ttm_round_pot(sizeof(struct vmw_fence_obj)); fman->event_fence_action_size = ttm_round_pot(sizeof(struct vmw_event_fence_action)); mutex_init(&fman->goal_irq_mutex); fman->ctx = dma_fence_context_alloc(1); return fman; } void vmw_fence_manager_takedown(struct vmw_fence_manager *fman) { bool lists_empty; (void) cancel_work_sync(&fman->work); spin_lock(&fman->lock); lists_empty = list_empty(&fman->fence_list) && list_empty(&fman->cleanup_list); spin_unlock(&fman->lock); BUG_ON(!lists_empty); kfree(fman); } static int vmw_fence_obj_init(struct vmw_fence_manager *fman, struct vmw_fence_obj *fence, u32 seqno, void (*destroy) (struct vmw_fence_obj *fence)) { int ret = 0; dma_fence_init(&fence->base, &vmw_fence_ops, &fman->lock, fman->ctx, seqno); INIT_LIST_HEAD(&fence->seq_passed_actions); fence->destroy = destroy; spin_lock(&fman->lock); if (unlikely(fman->fifo_down)) { ret = -EBUSY; goto out_unlock; } list_add_tail(&fence->head, &fman->fence_list); ++fman->num_fence_objects; out_unlock: spin_unlock(&fman->lock); return ret; } static void vmw_fences_perform_actions(struct vmw_fence_manager *fman, struct list_head *list) { struct vmw_fence_action *action, *next_action; list_for_each_entry_safe(action, next_action, list, head) { list_del_init(&action->head); fman->pending_actions[action->type]--; if (action->seq_passed != NULL) action->seq_passed(action); /* * Add the cleanup action to the cleanup list so that * it will be performed by a worker task. */ list_add_tail(&action->head, &fman->cleanup_list); } } /** * vmw_fence_goal_new_locked - Figure out a new device fence goal * seqno if needed. * * @fman: Pointer to a fence manager. * @passed_seqno: The seqno the device currently signals as passed. * * This function should be called with the fence manager lock held. * It is typically called when we have a new passed_seqno, and * we might need to update the fence goal. It checks to see whether * the current fence goal has already passed, and, in that case, * scans through all unsignaled fences to get the next fence object with an * action attached, and sets the seqno of that fence as a new fence goal. * * returns true if the device goal seqno was updated. False otherwise. */ static bool vmw_fence_goal_new_locked(struct vmw_fence_manager *fman, u32 passed_seqno) { u32 goal_seqno; struct vmw_fence_obj *fence; if (likely(!fman->seqno_valid)) return false; goal_seqno = vmw_fence_goal_read(fman->dev_priv); if (likely(passed_seqno - goal_seqno >= VMW_FENCE_WRAP)) return false; fman->seqno_valid = false; list_for_each_entry(fence, &fman->fence_list, head) { if (!list_empty(&fence->seq_passed_actions)) { fman->seqno_valid = true; vmw_fence_goal_write(fman->dev_priv, fence->base.seqno); break; } } return true; } /** * vmw_fence_goal_check_locked - Replace the device fence goal seqno if * needed. * * @fence: Pointer to a struct vmw_fence_obj the seqno of which should be * considered as a device fence goal. * * This function should be called with the fence manager lock held. * It is typically called when an action has been attached to a fence to * check whether the seqno of that fence should be used for a fence * goal interrupt. This is typically needed if the current fence goal is * invalid, or has a higher seqno than that of the current fence object. * * returns true if the device goal seqno was updated. False otherwise. */ static bool vmw_fence_goal_check_locked(struct vmw_fence_obj *fence) { struct vmw_fence_manager *fman = fman_from_fence(fence); u32 goal_seqno; if (dma_fence_is_signaled_locked(&fence->base)) return false; goal_seqno = vmw_fence_goal_read(fman->dev_priv); if (likely(fman->seqno_valid && goal_seqno - fence->base.seqno < VMW_FENCE_WRAP)) return false; vmw_fence_goal_write(fman->dev_priv, fence->base.seqno); fman->seqno_valid = true; return true; } static void __vmw_fences_update(struct vmw_fence_manager *fman) { struct vmw_fence_obj *fence, *next_fence; struct list_head action_list; bool needs_rerun; uint32_t seqno, new_seqno; seqno = vmw_fence_read(fman->dev_priv); rerun: list_for_each_entry_safe(fence, next_fence, &fman->fence_list, head) { if (seqno - fence->base.seqno < VMW_FENCE_WRAP) { list_del_init(&fence->head); dma_fence_signal_locked(&fence->base); INIT_LIST_HEAD(&action_list); list_splice_init(&fence->seq_passed_actions, &action_list); vmw_fences_perform_actions(fman, &action_list); } else break; } /* * Rerun if the fence goal seqno was updated, and the * hardware might have raced with that update, so that * we missed a fence_goal irq. */ needs_rerun = vmw_fence_goal_new_locked(fman, seqno); if (unlikely(needs_rerun)) { new_seqno = vmw_fence_read(fman->dev_priv); if (new_seqno != seqno) { seqno = new_seqno; goto rerun; } } if (!list_empty(&fman->cleanup_list)) (void) schedule_work(&fman->work); } void vmw_fences_update(struct vmw_fence_manager *fman) { spin_lock(&fman->lock); __vmw_fences_update(fman); spin_unlock(&fman->lock); } bool vmw_fence_obj_signaled(struct vmw_fence_obj *fence) { struct vmw_fence_manager *fman = fman_from_fence(fence); if (test_bit(DMA_FENCE_FLAG_SIGNALED_BIT, &fence->base.flags)) return true; vmw_fences_update(fman); return dma_fence_is_signaled(&fence->base); } int vmw_fence_obj_wait(struct vmw_fence_obj *fence, bool lazy, bool interruptible, unsigned long timeout) { long ret = dma_fence_wait_timeout(&fence->base, interruptible, timeout); if (likely(ret > 0)) return 0; else if (ret == 0) return -EBUSY; else return ret; } static void vmw_fence_destroy(struct vmw_fence_obj *fence) { dma_fence_free(&fence->base); } int vmw_fence_create(struct vmw_fence_manager *fman, uint32_t seqno, struct vmw_fence_obj **p_fence) { struct vmw_fence_obj *fence; int ret; fence = kzalloc(sizeof(*fence), GFP_KERNEL); if (unlikely(!fence)) return -ENOMEM; ret = vmw_fence_obj_init(fman, fence, seqno, vmw_fence_destroy); if (unlikely(ret != 0)) goto out_err_init; *p_fence = fence; return 0; out_err_init: kfree(fence); return ret; } static void vmw_user_fence_destroy(struct vmw_fence_obj *fence) { struct vmw_user_fence *ufence = container_of(fence, struct vmw_user_fence, fence); struct vmw_fence_manager *fman = fman_from_fence(fence); ttm_base_object_kfree(ufence, base); /* * Free kernel space accounting. */ ttm_mem_global_free(vmw_mem_glob(fman->dev_priv), fman->user_fence_size); } static void vmw_user_fence_base_release(struct ttm_base_object **p_base) { struct ttm_base_object *base = *p_base; struct vmw_user_fence *ufence = container_of(base, struct vmw_user_fence, base); struct vmw_fence_obj *fence = &ufence->fence; *p_base = NULL; vmw_fence_obj_unreference(&fence); } int vmw_user_fence_create(struct drm_file *file_priv, struct vmw_fence_manager *fman, uint32_t seqno, struct vmw_fence_obj **p_fence, uint32_t *p_handle) { struct ttm_object_file *tfile = vmw_fpriv(file_priv)->tfile; struct vmw_user_fence *ufence; struct vmw_fence_obj *tmp; struct ttm_mem_global *mem_glob = vmw_mem_glob(fman->dev_priv); struct ttm_operation_ctx ctx = { .interruptible = false, .no_wait_gpu = false }; int ret; /* * Kernel memory space accounting, since this object may * be created by a user-space request. */ ret = ttm_mem_global_alloc(mem_glob, fman->user_fence_size, &ctx); if (unlikely(ret != 0)) return ret; ufence = kzalloc(sizeof(*ufence), GFP_KERNEL); if (unlikely(!ufence)) { ret = -ENOMEM; goto out_no_object; } ret = vmw_fence_obj_init(fman, &ufence->fence, seqno, vmw_user_fence_destroy); if (unlikely(ret != 0)) { kfree(ufence); goto out_no_object; } /* * The base object holds a reference which is freed in * vmw_user_fence_base_release. */ tmp = vmw_fence_obj_reference(&ufence->fence); ret = ttm_base_object_init(tfile, &ufence->base, false, VMW_RES_FENCE, &vmw_user_fence_base_release, NULL); if (unlikely(ret != 0)) { /* * Free the base object's reference */ vmw_fence_obj_unreference(&tmp); goto out_err; } *p_fence = &ufence->fence; *p_handle = ufence->base.handle; return 0; out_err: tmp = &ufence->fence; vmw_fence_obj_unreference(&tmp); out_no_object: ttm_mem_global_free(mem_glob, fman->user_fence_size); return ret; } /** * vmw_wait_dma_fence - Wait for a dma fence * * @fman: pointer to a fence manager * @fence: DMA fence to wait on * * This function handles the case when the fence is actually a fence * array. If that's the case, it'll wait on each of the child fence */ int vmw_wait_dma_fence(struct vmw_fence_manager *fman, struct dma_fence *fence) { struct dma_fence_array *fence_array; int ret = 0; int i; if (dma_fence_is_signaled(fence)) return 0; if (!dma_fence_is_array(fence)) return dma_fence_wait(fence, true); /* From i915: Note that if the fence-array was created in * signal-on-any mode, we should *not* decompose it into its individual * fences. However, we don't currently store which mode the fence-array * is operating in. Fortunately, the only user of signal-on-any is * private to amdgpu and we should not see any incoming fence-array * from sync-file being in signal-on-any mode. */ fence_array = to_dma_fence_array(fence); for (i = 0; i < fence_array->num_fences; i++) { struct dma_fence *child = fence_array->fences[i]; ret = dma_fence_wait(child, true); if (ret < 0) return ret; } return 0; } /* * vmw_fence_fifo_down - signal all unsignaled fence objects. */ void vmw_fence_fifo_down(struct vmw_fence_manager *fman) { struct list_head action_list; int ret; /* * The list may be altered while we traverse it, so always * restart when we've released the fman->lock. */ spin_lock(&fman->lock); fman->fifo_down = true; while (!list_empty(&fman->fence_list)) { struct vmw_fence_obj *fence = list_entry(fman->fence_list.prev, struct vmw_fence_obj, head); dma_fence_get(&fence->base); spin_unlock(&fman->lock); ret = vmw_fence_obj_wait(fence, false, false, VMW_FENCE_WAIT_TIMEOUT); if (unlikely(ret != 0)) { list_del_init(&fence->head); dma_fence_signal(&fence->base); INIT_LIST_HEAD(&action_list); list_splice_init(&fence->seq_passed_actions, &action_list); vmw_fences_perform_actions(fman, &action_list); } BUG_ON(!list_empty(&fence->head)); dma_fence_put(&fence->base); spin_lock(&fman->lock); } spin_unlock(&fman->lock); } void vmw_fence_fifo_up(struct vmw_fence_manager *fman) { spin_lock(&fman->lock); fman->fifo_down = false; spin_unlock(&fman->lock); } /** * vmw_fence_obj_lookup - Look up a user-space fence object * * @tfile: A struct ttm_object_file identifying the caller. * @handle: A handle identifying the fence object. * @return: A struct vmw_user_fence base ttm object on success or * an error pointer on failure. * * The fence object is looked up and type-checked. The caller needs * to have opened the fence object first, but since that happens on * creation and fence objects aren't shareable, that's not an * issue currently. */ static struct ttm_base_object * vmw_fence_obj_lookup(struct ttm_object_file *tfile, u32 handle) { struct ttm_base_object *base = ttm_base_object_lookup(tfile, handle); if (!base) { pr_err("Invalid fence object handle 0x%08lx.\n", (unsigned long)handle); return ERR_PTR(-EINVAL); } if (base->refcount_release != vmw_user_fence_base_release) { pr_err("Invalid fence object handle 0x%08lx.\n", (unsigned long)handle); ttm_base_object_unref(&base); return ERR_PTR(-EINVAL); } return base; } int vmw_fence_obj_wait_ioctl(struct drm_device *dev, void *data, struct drm_file *file_priv) { struct drm_vmw_fence_wait_arg *arg = (struct drm_vmw_fence_wait_arg *)data; unsigned long timeout; struct ttm_base_object *base; struct vmw_fence_obj *fence; struct ttm_object_file *tfile = vmw_fpriv(file_priv)->tfile; int ret; uint64_t wait_timeout = ((uint64_t)arg->timeout_us * HZ); /* * 64-bit division not present on 32-bit systems, so do an * approximation. (Divide by 1000000). */ wait_timeout = (wait_timeout >> 20) + (wait_timeout >> 24) - (wait_timeout >> 26); if (!arg->cookie_valid) { arg->cookie_valid = 1; arg->kernel_cookie = jiffies + wait_timeout; } base = vmw_fence_obj_lookup(tfile, arg->handle); if (IS_ERR(base)) return PTR_ERR(base); fence = &(container_of(base, struct vmw_user_fence, base)->fence); timeout = jiffies; if (time_after_eq(timeout, (unsigned long)arg->kernel_cookie)) { ret = ((vmw_fence_obj_signaled(fence)) ? 0 : -EBUSY); goto out; } timeout = (unsigned long)arg->kernel_cookie - timeout; ret = vmw_fence_obj_wait(fence, arg->lazy, true, timeout); out: ttm_base_object_unref(&base); /* * Optionally unref the fence object. */ if (ret == 0 && (arg->wait_options & DRM_VMW_WAIT_OPTION_UNREF)) return ttm_ref_object_base_unref(tfile, arg->handle, TTM_REF_USAGE); return ret; } int vmw_fence_obj_signaled_ioctl(struct drm_device *dev, void *data, struct drm_file *file_priv) { struct drm_vmw_fence_signaled_arg *arg = (struct drm_vmw_fence_signaled_arg *) data; struct ttm_base_object *base; struct vmw_fence_obj *fence; struct vmw_fence_manager *fman; struct ttm_object_file *tfile = vmw_fpriv(file_priv)->tfile; struct vmw_private *dev_priv = vmw_priv(dev); base = vmw_fence_obj_lookup(tfile, arg->handle); if (IS_ERR(base)) return PTR_ERR(base); fence = &(container_of(base, struct vmw_user_fence, base)->fence); fman = fman_from_fence(fence); arg->signaled = vmw_fence_obj_signaled(fence); arg->signaled_flags = arg->flags; spin_lock(&fman->lock); arg->passed_seqno = dev_priv->last_read_seqno; spin_unlock(&fman->lock); ttm_base_object_unref(&base); return 0; } int vmw_fence_obj_unref_ioctl(struct drm_device *dev, void *data, struct drm_file *file_priv) { struct drm_vmw_fence_arg *arg = (struct drm_vmw_fence_arg *) data; return ttm_ref_object_base_unref(vmw_fpriv(file_priv)->tfile, arg->handle, TTM_REF_USAGE); } /** * vmw_event_fence_action_seq_passed * * @action: The struct vmw_fence_action embedded in a struct * vmw_event_fence_action. * * This function is called when the seqno of the fence where @action is * attached has passed. It queues the event on the submitter's event list. * This function is always called from atomic context. */ static void vmw_event_fence_action_seq_passed(struct vmw_fence_action *action) { struct vmw_event_fence_action *eaction = container_of(action, struct vmw_event_fence_action, action); struct drm_device *dev = eaction->dev; struct drm_pending_event *event = eaction->event; if (unlikely(event == NULL)) return; spin_lock_irq(&dev->event_lock); if (likely(eaction->tv_sec != NULL)) { struct timespec64 ts; ktime_get_ts64(&ts); /* monotonic time, so no y2038 overflow */ *eaction->tv_sec = ts.tv_sec; *eaction->tv_usec = ts.tv_nsec / NSEC_PER_USEC; } drm_send_event_locked(dev, eaction->event); eaction->event = NULL; spin_unlock_irq(&dev->event_lock); } /** * vmw_event_fence_action_cleanup * * @action: The struct vmw_fence_action embedded in a struct * vmw_event_fence_action. * * This function is the struct vmw_fence_action destructor. It's typically * called from a workqueue. */ static void vmw_event_fence_action_cleanup(struct vmw_fence_action *action) { struct vmw_event_fence_action *eaction = container_of(action, struct vmw_event_fence_action, action); vmw_fence_obj_unreference(&eaction->fence); kfree(eaction); } /** * vmw_fence_obj_add_action - Add an action to a fence object. * * @fence: The fence object. * @action: The action to add. * * Note that the action callbacks may be executed before this function * returns. */ static void vmw_fence_obj_add_action(struct vmw_fence_obj *fence, struct vmw_fence_action *action) { struct vmw_fence_manager *fman = fman_from_fence(fence); bool run_update = false; mutex_lock(&fman->goal_irq_mutex); spin_lock(&fman->lock); fman->pending_actions[action->type]++; if (dma_fence_is_signaled_locked(&fence->base)) { struct list_head action_list; INIT_LIST_HEAD(&action_list); list_add_tail(&action->head, &action_list); vmw_fences_perform_actions(fman, &action_list); } else { list_add_tail(&action->head, &fence->seq_passed_actions); /* * This function may set fman::seqno_valid, so it must * be run with the goal_irq_mutex held. */ run_update = vmw_fence_goal_check_locked(fence); } spin_unlock(&fman->lock); if (run_update) { if (!fman->goal_irq_on) { fman->goal_irq_on = true; vmw_goal_waiter_add(fman->dev_priv); } vmw_fences_update(fman); } mutex_unlock(&fman->goal_irq_mutex); } /** * vmw_event_fence_action_queue - Post an event for sending when a fence * object seqno has passed. * * @file_priv: The file connection on which the event should be posted. * @fence: The fence object on which to post the event. * @event: Event to be posted. This event should've been alloced * using k[mz]alloc, and should've been completely initialized. * @tv_sec: If non-null, the variable pointed to will be assigned * current time tv_sec val when the fence signals. * @tv_usec: Must be set if @tv_sec is set, and the variable pointed to will * be assigned the current time tv_usec val when the fence signals. * @interruptible: Interruptible waits if possible. * * As a side effect, the object pointed to by @event may have been * freed when this function returns. If this function returns with * an error code, the caller needs to free that object. */ int vmw_event_fence_action_queue(struct drm_file *file_priv, struct vmw_fence_obj *fence, struct drm_pending_event *event, uint32_t *tv_sec, uint32_t *tv_usec, bool interruptible) { struct vmw_event_fence_action *eaction; struct vmw_fence_manager *fman = fman_from_fence(fence); eaction = kzalloc(sizeof(*eaction), GFP_KERNEL); if (unlikely(!eaction)) return -ENOMEM; eaction->event = event; eaction->action.seq_passed = vmw_event_fence_action_seq_passed; eaction->action.cleanup = vmw_event_fence_action_cleanup; eaction->action.type = VMW_ACTION_EVENT; eaction->fence = vmw_fence_obj_reference(fence); eaction->dev = &fman->dev_priv->drm; eaction->tv_sec = tv_sec; eaction->tv_usec = tv_usec; vmw_fence_obj_add_action(fence, &eaction->action); return 0; } struct vmw_event_fence_pending { struct drm_pending_event base; struct drm_vmw_event_fence event; }; static int vmw_event_fence_action_create(struct drm_file *file_priv, struct vmw_fence_obj *fence, uint32_t flags, uint64_t user_data, bool interruptible) { struct vmw_event_fence_pending *event; struct vmw_fence_manager *fman = fman_from_fence(fence); struct drm_device *dev = &fman->dev_priv->drm; int ret; event = kzalloc(sizeof(*event), GFP_KERNEL); if (unlikely(!event)) { DRM_ERROR("Failed to allocate an event.\n"); ret = -ENOMEM; goto out_no_space; } event->event.base.type = DRM_VMW_EVENT_FENCE_SIGNALED; event->event.base.length = sizeof(event->event); event->event.user_data = user_data; ret = drm_event_reserve_init(dev, file_priv, &event->base, &event->event.base); if (unlikely(ret != 0)) { DRM_ERROR("Failed to allocate event space for this file.\n"); kfree(event); goto out_no_space; } if (flags & DRM_VMW_FE_FLAG_REQ_TIME) ret = vmw_event_fence_action_queue(file_priv, fence, &event->base, &event->event.tv_sec, &event->event.tv_usec, interruptible); else ret = vmw_event_fence_action_queue(file_priv, fence, &event->base, NULL, NULL, interruptible); if (ret != 0) goto out_no_queue; return 0; out_no_queue: drm_event_cancel_free(dev, &event->base); out_no_space: return ret; } int vmw_fence_event_ioctl(struct drm_device *dev, void *data, struct drm_file *file_priv) { struct vmw_private *dev_priv = vmw_priv(dev); struct drm_vmw_fence_event_arg *arg = (struct drm_vmw_fence_event_arg *) data; struct vmw_fence_obj *fence = NULL; struct vmw_fpriv *vmw_fp = vmw_fpriv(file_priv); struct ttm_object_file *tfile = vmw_fp->tfile; struct drm_vmw_fence_rep __user *user_fence_rep = (struct drm_vmw_fence_rep __user *)(unsigned long) arg->fence_rep; uint32_t handle; int ret; /* * Look up an existing fence object, * and if user-space wants a new reference, * add one. */ if (arg->handle) { struct ttm_base_object *base = vmw_fence_obj_lookup(tfile, arg->handle); if (IS_ERR(base)) return PTR_ERR(base); fence = &(container_of(base, struct vmw_user_fence, base)->fence); (void) vmw_fence_obj_reference(fence); if (user_fence_rep != NULL) { ret = ttm_ref_object_add(vmw_fp->tfile, base, TTM_REF_USAGE, NULL, false); if (unlikely(ret != 0)) { DRM_ERROR("Failed to reference a fence " "object.\n"); goto out_no_ref_obj; } handle = base->handle; } ttm_base_object_unref(&base); } /* * Create a new fence object. */ if (!fence) { ret = vmw_execbuf_fence_commands(file_priv, dev_priv, &fence, (user_fence_rep) ? &handle : NULL); if (unlikely(ret != 0)) { DRM_ERROR("Fence event failed to create fence.\n"); return ret; } } BUG_ON(fence == NULL); ret = vmw_event_fence_action_create(file_priv, fence, arg->flags, arg->user_data, true); if (unlikely(ret != 0)) { if (ret != -ERESTARTSYS) DRM_ERROR("Failed to attach event to fence.\n"); goto out_no_create; } vmw_execbuf_copy_fence_user(dev_priv, vmw_fp, 0, user_fence_rep, fence, handle, -1); vmw_fence_obj_unreference(&fence); return 0; out_no_create: if (user_fence_rep != NULL) ttm_ref_object_base_unref(tfile, handle, TTM_REF_USAGE); out_no_ref_obj: vmw_fence_obj_unreference(&fence); return ret; }