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- /**************************************************************************
- *
- * Copyright © 2011-2014 VMware, Inc., Palo Alto, CA., USA
- * All Rights Reserved.
- *
- * 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 <drm/drmP.h>
- #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. */
- unsigned 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.
- *
- * @e: A struct drm_pending_event that controls the event delivery.
- * @action: A struct vmw_fence_action to hook up to a fence.
- * @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.
- * @kref: Both @e and @action has destructors, so we need to refcount.
- * @size: Size accounted for this object.
- * @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 list_head fpriv_head;
- 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);
- }
- /**
- * 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 fence *f)
- {
- struct vmw_fence_obj *fence =
- container_of(f, struct vmw_fence_obj, base);
- struct vmw_fence_manager *fman = fman_from_fence(fence);
- unsigned long irq_flags;
- spin_lock_irqsave(&fman->lock, irq_flags);
- list_del_init(&fence->head);
- --fman->num_fence_objects;
- spin_unlock_irqrestore(&fman->lock, irq_flags);
- fence->destroy(fence);
- }
- static const char *vmw_fence_get_driver_name(struct fence *f)
- {
- return "vmwgfx";
- }
- static const char *vmw_fence_get_timeline_name(struct fence *f)
- {
- return "svga";
- }
- static bool vmw_fence_enable_signaling(struct 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 *fifo_mem = dev_priv->mmio_virt;
- u32 seqno = vmw_mmio_read(fifo_mem + SVGA_FIFO_FENCE);
- if (seqno - fence->base.seqno < VMW_FENCE_WRAP)
- return false;
- vmw_fifo_ping_host(dev_priv, SVGA_SYNC_GENERIC);
- return true;
- }
- struct vmwgfx_wait_cb {
- struct fence_cb base;
- struct task_struct *task;
- };
- static void
- vmwgfx_wait_cb(struct fence *fence, struct 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 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;
- unsigned long irq_flags;
- if (likely(vmw_fence_obj_signaled(fence)))
- return timeout;
- vmw_fifo_ping_host(dev_priv, SVGA_SYNC_GENERIC);
- vmw_seqno_waiter_add(dev_priv);
- spin_lock_irqsave(f->lock, irq_flags);
- 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);
- while (ret > 0) {
- __vmw_fences_update(fman);
- if (test_bit(FENCE_FLAG_SIGNALED_BIT, &f->flags))
- break;
- if (intr)
- __set_current_state(TASK_INTERRUPTIBLE);
- else
- __set_current_state(TASK_UNINTERRUPTIBLE);
- spin_unlock_irqrestore(f->lock, irq_flags);
- ret = schedule_timeout(ret);
- spin_lock_irqsave(f->lock, irq_flags);
- if (ret > 0 && intr && signal_pending(current))
- ret = -ERESTARTSYS;
- }
- if (!list_empty(&cb.base.node))
- list_del(&cb.base.node);
- __set_current_state(TASK_RUNNING);
- out:
- spin_unlock_irqrestore(f->lock, irq_flags);
- vmw_seqno_waiter_remove(dev_priv);
- return ret;
- }
- static struct 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_irq(&fman->lock);
- list_splice_init(&fman->cleanup_list, &list);
- seqno_valid = fman->seqno_valid;
- spin_unlock_irq(&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 == NULL))
- 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));
- 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 = fence_context_alloc(1);
- return fman;
- }
- void vmw_fence_manager_takedown(struct vmw_fence_manager *fman)
- {
- unsigned long irq_flags;
- bool lists_empty;
- (void) cancel_work_sync(&fman->work);
- spin_lock_irqsave(&fman->lock, irq_flags);
- lists_empty = list_empty(&fman->fence_list) &&
- list_empty(&fman->cleanup_list);
- spin_unlock_irqrestore(&fman->lock, irq_flags);
- 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))
- {
- unsigned long irq_flags;
- int ret = 0;
- fence_init(&fence->base, &vmw_fence_ops, &fman->lock,
- fman->ctx, seqno);
- INIT_LIST_HEAD(&fence->seq_passed_actions);
- fence->destroy = destroy;
- spin_lock_irqsave(&fman->lock, irq_flags);
- 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_irqrestore(&fman->lock, irq_flags);
- 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;
- u32 *fifo_mem;
- struct vmw_fence_obj *fence;
- if (likely(!fman->seqno_valid))
- return false;
- fifo_mem = fman->dev_priv->mmio_virt;
- goal_seqno = vmw_mmio_read(fifo_mem + SVGA_FIFO_FENCE_GOAL);
- 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_mmio_write(fence->base.seqno,
- fifo_mem + SVGA_FIFO_FENCE_GOAL);
- 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;
- u32 *fifo_mem;
- if (fence_is_signaled_locked(&fence->base))
- return false;
- fifo_mem = fman->dev_priv->mmio_virt;
- goal_seqno = vmw_mmio_read(fifo_mem + SVGA_FIFO_FENCE_GOAL);
- if (likely(fman->seqno_valid &&
- goal_seqno - fence->base.seqno < VMW_FENCE_WRAP))
- return false;
- vmw_mmio_write(fence->base.seqno, fifo_mem + SVGA_FIFO_FENCE_GOAL);
- 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;
- u32 *fifo_mem = fman->dev_priv->mmio_virt;
- seqno = vmw_mmio_read(fifo_mem + SVGA_FIFO_FENCE);
- 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);
- 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_mmio_read(fifo_mem + SVGA_FIFO_FENCE);
- 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)
- {
- unsigned long irq_flags;
- spin_lock_irqsave(&fman->lock, irq_flags);
- __vmw_fences_update(fman);
- spin_unlock_irqrestore(&fman->lock, irq_flags);
- }
- bool vmw_fence_obj_signaled(struct vmw_fence_obj *fence)
- {
- struct vmw_fence_manager *fman = fman_from_fence(fence);
- if (test_bit(FENCE_FLAG_SIGNALED_BIT, &fence->base.flags))
- return 1;
- vmw_fences_update(fman);
- return fence_is_signaled(&fence->base);
- }
- int vmw_fence_obj_wait(struct vmw_fence_obj *fence, bool lazy,
- bool interruptible, unsigned long timeout)
- {
- long ret = fence_wait_timeout(&fence->base, interruptible, timeout);
- if (likely(ret > 0))
- return 0;
- else if (ret == 0)
- return -EBUSY;
- else
- return ret;
- }
- void vmw_fence_obj_flush(struct vmw_fence_obj *fence)
- {
- struct vmw_private *dev_priv = fman_from_fence(fence)->dev_priv;
- vmw_fifo_ping_host(dev_priv, SVGA_SYNC_GENERIC);
- }
- static void vmw_fence_destroy(struct vmw_fence_obj *fence)
- {
- 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 == NULL))
- 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);
- 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,
- false, false);
- if (unlikely(ret != 0))
- return ret;
- ufence = kzalloc(sizeof(*ufence), GFP_KERNEL);
- if (unlikely(ufence == NULL)) {
- 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.hash.key;
- 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_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_irq(&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);
- fence_get(&fence->base);
- spin_unlock_irq(&fman->lock);
- ret = vmw_fence_obj_wait(fence, false, false,
- VMW_FENCE_WAIT_TIMEOUT);
- if (unlikely(ret != 0)) {
- list_del_init(&fence->head);
- 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));
- fence_put(&fence->base);
- spin_lock_irq(&fman->lock);
- }
- spin_unlock_irq(&fman->lock);
- }
- void vmw_fence_fifo_up(struct vmw_fence_manager *fman)
- {
- unsigned long irq_flags;
- spin_lock_irqsave(&fman->lock, irq_flags);
- fman->fifo_down = false;
- spin_unlock_irqrestore(&fman->lock, irq_flags);
- }
- /**
- * 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_irq(&fman->lock);
- arg->passed_seqno = dev_priv->last_read_seqno;
- spin_unlock_irq(&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_fpriv_gone - Remove references to struct drm_file objects
- *
- * @fman: Pointer to a struct vmw_fence_manager
- * @event_list: Pointer to linked list of struct vmw_event_fence_action objects
- * with pointers to a struct drm_file object about to be closed.
- *
- * This function removes all pending fence events with references to a
- * specific struct drm_file object about to be closed. The caller is required
- * to pass a list of all struct vmw_event_fence_action objects with such
- * events attached. This function is typically called before the
- * struct drm_file object's event management is taken down.
- */
- void vmw_event_fence_fpriv_gone(struct vmw_fence_manager *fman,
- struct list_head *event_list)
- {
- struct vmw_event_fence_action *eaction;
- struct drm_pending_event *event;
- unsigned long irq_flags;
- while (1) {
- spin_lock_irqsave(&fman->lock, irq_flags);
- if (list_empty(event_list))
- goto out_unlock;
- eaction = list_first_entry(event_list,
- struct vmw_event_fence_action,
- fpriv_head);
- list_del_init(&eaction->fpriv_head);
- event = eaction->event;
- eaction->event = NULL;
- spin_unlock_irqrestore(&fman->lock, irq_flags);
- event->destroy(event);
- }
- out_unlock:
- spin_unlock_irqrestore(&fman->lock, irq_flags);
- }
- /**
- * 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, and may be called
- * from irq 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;
- struct drm_file *file_priv;
- unsigned long irq_flags;
- if (unlikely(event == NULL))
- return;
- file_priv = event->file_priv;
- spin_lock_irqsave(&dev->event_lock, irq_flags);
- if (likely(eaction->tv_sec != NULL)) {
- struct timeval tv;
- do_gettimeofday(&tv);
- *eaction->tv_sec = tv.tv_sec;
- *eaction->tv_usec = tv.tv_usec;
- }
- list_del_init(&eaction->fpriv_head);
- list_add_tail(&eaction->event->link, &file_priv->event_list);
- eaction->event = NULL;
- wake_up_all(&file_priv->event_wait);
- spin_unlock_irqrestore(&dev->event_lock, irq_flags);
- }
- /**
- * 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);
- struct vmw_fence_manager *fman = fman_from_fence(eaction->fence);
- unsigned long irq_flags;
- spin_lock_irqsave(&fman->lock, irq_flags);
- list_del(&eaction->fpriv_head);
- spin_unlock_irqrestore(&fman->lock, irq_flags);
- 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);
- unsigned long irq_flags;
- bool run_update = false;
- mutex_lock(&fman->goal_irq_mutex);
- spin_lock_irqsave(&fman->lock, irq_flags);
- fman->pending_actions[action->type]++;
- if (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_irqrestore(&fman->lock, irq_flags);
- 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_create - 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.
- * @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);
- struct vmw_fpriv *vmw_fp = vmw_fpriv(file_priv);
- unsigned long irq_flags;
- eaction = kzalloc(sizeof(*eaction), GFP_KERNEL);
- if (unlikely(eaction == NULL))
- 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->dev;
- eaction->tv_sec = tv_sec;
- eaction->tv_usec = tv_usec;
- spin_lock_irqsave(&fman->lock, irq_flags);
- list_add_tail(&eaction->fpriv_head, &vmw_fp->fence_events);
- spin_unlock_irqrestore(&fman->lock, irq_flags);
- 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->dev;
- unsigned long irq_flags;
- int ret;
- spin_lock_irqsave(&dev->event_lock, irq_flags);
- ret = (file_priv->event_space < sizeof(event->event)) ? -EBUSY : 0;
- if (likely(ret == 0))
- file_priv->event_space -= sizeof(event->event);
- spin_unlock_irqrestore(&dev->event_lock, irq_flags);
- if (unlikely(ret != 0)) {
- DRM_ERROR("Failed to allocate event space for this file.\n");
- goto out_no_space;
- }
- event = kzalloc(sizeof(*event), GFP_KERNEL);
- if (unlikely(event == NULL)) {
- DRM_ERROR("Failed to allocate an event.\n");
- ret = -ENOMEM;
- goto out_no_event;
- }
- event->event.base.type = DRM_VMW_EVENT_FENCE_SIGNALED;
- event->event.base.length = sizeof(*event);
- event->event.user_data = user_data;
- event->base.event = &event->event.base;
- event->base.file_priv = file_priv;
- event->base.destroy = (void (*) (struct drm_pending_event *)) kfree;
- 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:
- event->base.destroy(&event->base);
- out_no_event:
- spin_lock_irqsave(&dev->event_lock, irq_flags);
- file_priv->event_space += sizeof(*event);
- spin_unlock_irqrestore(&dev->event_lock, irq_flags);
- 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->hash.key;
- }
- 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);
- 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;
- }
|