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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-11 08:27:49 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-11 08:27:49 +0000 |
commit | ace9429bb58fd418f0c81d4c2835699bddf6bde6 (patch) | |
tree | b2d64bc10158fdd5497876388cd68142ca374ed3 /drivers/gpu/drm/vmwgfx/vmwgfx_fence.c | |
parent | Initial commit. (diff) | |
download | linux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.tar.xz linux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.zip |
Adding upstream version 6.6.15.upstream/6.6.15
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'drivers/gpu/drm/vmwgfx/vmwgfx_fence.c')
-rw-r--r-- | drivers/gpu/drm/vmwgfx/vmwgfx_fence.c | 1108 |
1 files changed, 1108 insertions, 0 deletions
diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_fence.c b/drivers/gpu/drm/vmwgfx/vmwgfx_fence.c new file mode 100644 index 0000000000..2a0cda3247 --- /dev/null +++ b/drivers/gpu/drm/vmwgfx/vmwgfx_fence.c @@ -0,0 +1,1108 @@ +// SPDX-License-Identifier: GPL-2.0 OR MIT +/************************************************************************** + * + * Copyright 2011-2023 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 <linux/sched/signal.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; + 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; + 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); + + ttm_base_object_kfree(ufence, base); +} + +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; + int 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); + + + 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: + 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(&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); + 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); +} + +/** + * 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.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, + 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); +out_no_ref_obj: + vmw_fence_obj_unreference(&fence); + return ret; +} |