// 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;
}
