| /************************************************************************** |
| * |
| * Copyright 2006 Tungsten Graphics, Inc., Bismarck, ND., 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 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. |
| * |
| * The above copyright notice and this permission notice (including the |
| * next paragraph) shall be included in all copies or substantial portions |
| * of the Software. |
| * |
| * |
| **************************************************************************/ |
| /* |
| * Authors: Thomas Hellström <thomas-at-tungstengraphics-dot-com> |
| */ |
| |
| #include "drmP.h" |
| |
| /* |
| * Typically called by the IRQ handler. |
| */ |
| |
| void drm_fence_handler(drm_device_t * dev, uint32_t sequence, uint32_t type) |
| { |
| int wake = 0; |
| uint32_t diff; |
| uint32_t relevant; |
| drm_fence_manager_t *fm = &dev->fm; |
| drm_fence_driver_t *driver = dev->driver->fence_driver; |
| struct list_head *list, *prev; |
| drm_fence_object_t *fence; |
| int found = 0; |
| |
| if (list_empty(&fm->ring)) |
| return; |
| |
| list_for_each_entry(fence, &fm->ring, ring) { |
| diff = (sequence - fence->sequence) & driver->sequence_mask; |
| if (diff > driver->wrap_diff) { |
| found = 1; |
| break; |
| } |
| } |
| |
| list = (found) ? fence->ring.prev : fm->ring.prev; |
| prev = list->prev; |
| |
| for (; list != &fm->ring; list = prev, prev = list->prev) { |
| fence = list_entry(list, drm_fence_object_t, ring); |
| |
| type |= fence->native_type; |
| relevant = type & fence->type; |
| |
| if ((fence->signaled | relevant) != fence->signaled) { |
| fence->signaled |= relevant; |
| DRM_DEBUG("Fence 0x%08lx signaled 0x%08x\n", |
| fence->base.hash.key, fence->signaled); |
| fence->submitted_flush |= relevant; |
| wake = 1; |
| } |
| |
| relevant = fence->flush_mask & |
| ~(fence->signaled | fence->submitted_flush); |
| |
| if (relevant) { |
| fm->pending_flush |= relevant; |
| fence->submitted_flush = fence->flush_mask; |
| } |
| |
| if (!(fence->type & ~fence->signaled)) { |
| DRM_DEBUG("Fence completely signaled 0x%08lx\n", |
| fence->base.hash.key); |
| list_del_init(&fence->ring); |
| } |
| |
| } |
| |
| if (wake) { |
| DRM_WAKEUP(&fm->fence_queue); |
| } |
| } |
| |
| EXPORT_SYMBOL(drm_fence_handler); |
| |
| static void drm_fence_unring(drm_device_t * dev, struct list_head *ring) |
| { |
| drm_fence_manager_t *fm = &dev->fm; |
| unsigned long flags; |
| |
| write_lock_irqsave(&fm->lock, flags); |
| list_del_init(ring); |
| write_unlock_irqrestore(&fm->lock, flags); |
| } |
| |
| void drm_fence_usage_deref_locked(drm_device_t * dev, |
| drm_fence_object_t * fence) |
| { |
| drm_fence_manager_t *fm = &dev->fm; |
| |
| if (atomic_dec_and_test(&fence->usage)) { |
| drm_fence_unring(dev, &fence->ring); |
| DRM_DEBUG("Destroyed a fence object 0x%08lx\n", |
| fence->base.hash.key); |
| atomic_dec(&fm->count); |
| drm_ctl_free(fence, sizeof(*fence), DRM_MEM_FENCE); |
| } |
| } |
| |
| void drm_fence_usage_deref_unlocked(drm_device_t * dev, |
| drm_fence_object_t * fence) |
| { |
| drm_fence_manager_t *fm = &dev->fm; |
| |
| if (atomic_dec_and_test(&fence->usage)) { |
| mutex_lock(&dev->struct_mutex); |
| if (atomic_read(&fence->usage) == 0) { |
| drm_fence_unring(dev, &fence->ring); |
| atomic_dec(&fm->count); |
| drm_ctl_free(fence, sizeof(*fence), DRM_MEM_FENCE); |
| } |
| mutex_unlock(&dev->struct_mutex); |
| } |
| } |
| |
| static void drm_fence_object_destroy(drm_file_t * priv, |
| drm_user_object_t * base) |
| { |
| drm_device_t *dev = priv->head->dev; |
| drm_fence_object_t *fence = |
| drm_user_object_entry(base, drm_fence_object_t, base); |
| |
| drm_fence_usage_deref_locked(dev, fence); |
| } |
| |
| static int fence_signaled(drm_device_t * dev, volatile |
| drm_fence_object_t * fence, |
| uint32_t mask, int poke_flush) |
| { |
| unsigned long flags; |
| int signaled; |
| drm_fence_manager_t *fm = &dev->fm; |
| drm_fence_driver_t *driver = dev->driver->fence_driver; |
| |
| if (poke_flush) |
| driver->poke_flush(dev); |
| read_lock_irqsave(&fm->lock, flags); |
| signaled = |
| (fence->type & mask & fence->signaled) == (fence->type & mask); |
| read_unlock_irqrestore(&fm->lock, flags); |
| |
| return signaled; |
| } |
| |
| static void drm_fence_flush_exe(drm_fence_manager_t * fm, |
| drm_fence_driver_t * driver, uint32_t sequence) |
| { |
| uint32_t diff; |
| |
| if (!fm->pending_exe_flush) { |
| volatile struct list_head *list; |
| |
| /* |
| * Last_exe_flush is invalid. Find oldest sequence. |
| */ |
| |
| /* list = fm->fence_types[_DRM_FENCE_TYPE_EXE];*/ |
| list = &fm->ring; |
| if (list->next == &fm->ring) { |
| return; |
| } else { |
| drm_fence_object_t *fence = |
| list_entry(list->next, drm_fence_object_t, ring); |
| fm->last_exe_flush = (fence->sequence - 1) & |
| driver->sequence_mask; |
| } |
| diff = (sequence - fm->last_exe_flush) & driver->sequence_mask; |
| if (diff >= driver->wrap_diff) |
| return; |
| fm->exe_flush_sequence = sequence; |
| fm->pending_exe_flush = 1; |
| } else { |
| diff = |
| (sequence - fm->exe_flush_sequence) & driver->sequence_mask; |
| if (diff < driver->wrap_diff) { |
| fm->exe_flush_sequence = sequence; |
| } |
| } |
| } |
| |
| int drm_fence_object_signaled(volatile drm_fence_object_t * fence, |
| uint32_t type) |
| { |
| return ((fence->signaled & type) == type); |
| } |
| |
| int drm_fence_object_flush(drm_device_t * dev, |
| volatile drm_fence_object_t * fence, uint32_t type) |
| { |
| drm_fence_manager_t *fm = &dev->fm; |
| drm_fence_driver_t *driver = dev->driver->fence_driver; |
| unsigned long flags; |
| |
| if (type & ~fence->type) { |
| DRM_ERROR("Flush trying to extend fence type, " |
| "0x%x, 0x%x\n", type, fence->type); |
| return -EINVAL; |
| } |
| |
| write_lock_irqsave(&fm->lock, flags); |
| fence->flush_mask |= type; |
| if (fence->submitted_flush == fence->signaled) { |
| if ((fence->type & DRM_FENCE_TYPE_EXE) && |
| !(fence->submitted_flush & DRM_FENCE_TYPE_EXE)) { |
| drm_fence_flush_exe(fm, driver, fence->sequence); |
| fence->submitted_flush |= DRM_FENCE_TYPE_EXE; |
| } else { |
| fm->pending_flush |= (fence->flush_mask & |
| ~fence->submitted_flush); |
| fence->submitted_flush = fence->flush_mask; |
| } |
| } |
| write_unlock_irqrestore(&fm->lock, flags); |
| driver->poke_flush(dev); |
| return 0; |
| } |
| |
| /* |
| * Make sure old fence objects are signaled before their fence sequences are |
| * wrapped around and reused. |
| */ |
| |
| void drm_fence_flush_old(drm_device_t * dev, uint32_t sequence) |
| { |
| drm_fence_manager_t *fm = &dev->fm; |
| drm_fence_driver_t *driver = dev->driver->fence_driver; |
| uint32_t old_sequence; |
| unsigned long flags; |
| drm_fence_object_t *fence; |
| uint32_t diff; |
| |
| mutex_lock(&dev->struct_mutex); |
| read_lock_irqsave(&fm->lock, flags); |
| if (fm->ring.next == &fm->ring) { |
| read_unlock_irqrestore(&fm->lock, flags); |
| mutex_unlock(&dev->struct_mutex); |
| return; |
| } |
| old_sequence = (sequence - driver->flush_diff) & driver->sequence_mask; |
| fence = list_entry(fm->ring.next, drm_fence_object_t, ring); |
| atomic_inc(&fence->usage); |
| mutex_unlock(&dev->struct_mutex); |
| diff = (old_sequence - fence->sequence) & driver->sequence_mask; |
| read_unlock_irqrestore(&fm->lock, flags); |
| if (diff < driver->wrap_diff) { |
| drm_fence_object_flush(dev, fence, fence->type); |
| } |
| drm_fence_usage_deref_unlocked(dev, fence); |
| } |
| |
| EXPORT_SYMBOL(drm_fence_flush_old); |
| |
| int drm_fence_object_wait(drm_device_t * dev, |
| volatile drm_fence_object_t * fence, |
| int lazy, int ignore_signals, uint32_t mask) |
| { |
| drm_fence_manager_t *fm = &dev->fm; |
| drm_fence_driver_t *driver = dev->driver->fence_driver; |
| int ret = 0; |
| unsigned long _end; |
| int signaled; |
| |
| if (mask & ~fence->type) { |
| DRM_ERROR("Wait trying to extend fence type" |
| " 0x%08x 0x%08x\n", mask, fence->type); |
| return -EINVAL; |
| } |
| |
| if (fence_signaled(dev, fence, mask, 0)) |
| return 0; |
| |
| _end = jiffies + 3 * DRM_HZ; |
| |
| drm_fence_object_flush(dev, fence, mask); |
| |
| if (lazy && driver->lazy_capable) { |
| |
| do { |
| DRM_WAIT_ON(ret, fm->fence_queue, 3 * DRM_HZ, |
| fence_signaled(dev, fence, mask, 1)); |
| if (time_after_eq(jiffies, _end)) |
| break; |
| } while (ret == -EINTR && ignore_signals); |
| if (time_after_eq(jiffies, _end) && (ret != 0)) |
| ret = -EBUSY; |
| if (ret) { |
| if (ret == -EBUSY) { |
| DRM_ERROR("Fence timeout. " |
| "GPU lockup or fence driver was " |
| "taken down.\n"); |
| } |
| return ((ret == -EINTR) ? -EAGAIN : ret); |
| } |
| } else if ((fence->class == 0) && (mask & DRM_FENCE_TYPE_EXE) && |
| driver->lazy_capable) { |
| |
| /* |
| * We use IRQ wait for EXE fence if available to gain |
| * CPU in some cases. |
| */ |
| |
| do { |
| DRM_WAIT_ON(ret, fm->fence_queue, 3 * DRM_HZ, |
| fence_signaled(dev, fence, |
| DRM_FENCE_TYPE_EXE, 1)); |
| if (time_after_eq(jiffies, _end)) |
| break; |
| } while (ret == -EINTR && ignore_signals); |
| if (time_after_eq(jiffies, _end) && (ret != 0)) |
| ret = -EBUSY; |
| if (ret) |
| return ((ret == -EINTR) ? -EAGAIN : ret); |
| } |
| |
| if (fence_signaled(dev, fence, mask, 0)) |
| return 0; |
| |
| /* |
| * Avoid kernel-space busy-waits. |
| */ |
| #if 1 |
| if (!ignore_signals) |
| return -EAGAIN; |
| #endif |
| do { |
| schedule(); |
| signaled = fence_signaled(dev, fence, mask, 1); |
| } while (!signaled && !time_after_eq(jiffies, _end)); |
| |
| if (!signaled) |
| return -EBUSY; |
| |
| return 0; |
| } |
| |
| int drm_fence_object_emit(drm_device_t * dev, drm_fence_object_t * fence, |
| uint32_t fence_flags, uint32_t type) |
| { |
| drm_fence_manager_t *fm = &dev->fm; |
| drm_fence_driver_t *driver = dev->driver->fence_driver; |
| unsigned long flags; |
| uint32_t sequence; |
| uint32_t native_type; |
| int ret; |
| |
| drm_fence_unring(dev, &fence->ring); |
| ret = driver->emit(dev, fence_flags, &sequence, &native_type); |
| if (ret) |
| return ret; |
| |
| write_lock_irqsave(&fm->lock, flags); |
| fence->type = type; |
| fence->flush_mask = 0x00; |
| fence->submitted_flush = 0x00; |
| fence->signaled = 0x00; |
| fence->sequence = sequence; |
| fence->native_type = native_type; |
| list_add_tail(&fence->ring, &fm->ring); |
| write_unlock_irqrestore(&fm->lock, flags); |
| return 0; |
| } |
| |
| static int drm_fence_object_init(drm_device_t * dev, uint32_t type, |
| uint32_t fence_flags, |
| drm_fence_object_t * fence) |
| { |
| int ret = 0; |
| unsigned long flags; |
| drm_fence_manager_t *fm = &dev->fm; |
| |
| mutex_lock(&dev->struct_mutex); |
| atomic_set(&fence->usage, 1); |
| mutex_unlock(&dev->struct_mutex); |
| |
| write_lock_irqsave(&fm->lock, flags); |
| INIT_LIST_HEAD(&fence->ring); |
| fence->class = 0; |
| fence->type = type; |
| fence->flush_mask = 0; |
| fence->submitted_flush = 0; |
| fence->signaled = 0; |
| fence->sequence = 0; |
| write_unlock_irqrestore(&fm->lock, flags); |
| if (fence_flags & DRM_FENCE_FLAG_EMIT) { |
| ret = drm_fence_object_emit(dev, fence, fence_flags, type); |
| } |
| return ret; |
| } |
| |
| int drm_fence_add_user_object(drm_file_t * priv, drm_fence_object_t * fence, |
| int shareable) |
| { |
| drm_device_t *dev = priv->head->dev; |
| int ret; |
| |
| mutex_lock(&dev->struct_mutex); |
| ret = drm_add_user_object(priv, &fence->base, shareable); |
| mutex_unlock(&dev->struct_mutex); |
| if (ret) |
| return ret; |
| fence->base.type = drm_fence_type; |
| fence->base.remove = &drm_fence_object_destroy; |
| DRM_DEBUG("Fence 0x%08lx created\n", fence->base.hash.key); |
| return 0; |
| } |
| |
| EXPORT_SYMBOL(drm_fence_add_user_object); |
| |
| int drm_fence_object_create(drm_device_t * dev, uint32_t type, |
| unsigned flags, drm_fence_object_t ** c_fence) |
| { |
| drm_fence_object_t *fence; |
| int ret; |
| drm_fence_manager_t *fm = &dev->fm; |
| |
| fence = drm_ctl_alloc(sizeof(*fence), DRM_MEM_FENCE); |
| if (!fence) |
| return -ENOMEM; |
| ret = drm_fence_object_init(dev, type, flags, fence); |
| if (ret) { |
| drm_fence_usage_deref_unlocked(dev, fence); |
| return ret; |
| } |
| *c_fence = fence; |
| atomic_inc(&fm->count); |
| |
| return 0; |
| } |
| |
| EXPORT_SYMBOL(drm_fence_object_create); |
| |
| void drm_fence_manager_init(drm_device_t * dev) |
| { |
| drm_fence_manager_t *fm = &dev->fm; |
| drm_fence_driver_t *fed = dev->driver->fence_driver; |
| int i; |
| |
| fm->lock = RW_LOCK_UNLOCKED; |
| write_lock(&fm->lock); |
| INIT_LIST_HEAD(&fm->ring); |
| fm->pending_flush = 0; |
| DRM_INIT_WAITQUEUE(&fm->fence_queue); |
| fm->initialized = 0; |
| if (fed) { |
| fm->initialized = 1; |
| atomic_set(&fm->count, 0); |
| for (i = 0; i < fed->no_types; ++i) { |
| fm->fence_types[i] = &fm->ring; |
| } |
| } |
| write_unlock(&fm->lock); |
| } |
| |
| void drm_fence_manager_takedown(drm_device_t * dev) |
| { |
| } |
| |
| drm_fence_object_t *drm_lookup_fence_object(drm_file_t * priv, uint32_t handle) |
| { |
| drm_device_t *dev = priv->head->dev; |
| drm_user_object_t *uo; |
| drm_fence_object_t *fence; |
| |
| mutex_lock(&dev->struct_mutex); |
| uo = drm_lookup_user_object(priv, handle); |
| if (!uo || (uo->type != drm_fence_type)) { |
| mutex_unlock(&dev->struct_mutex); |
| return NULL; |
| } |
| fence = drm_user_object_entry(uo, drm_fence_object_t, base); |
| atomic_inc(&fence->usage); |
| mutex_unlock(&dev->struct_mutex); |
| return fence; |
| } |
| |
| int drm_fence_ioctl(DRM_IOCTL_ARGS) |
| { |
| DRM_DEVICE; |
| int ret; |
| drm_fence_manager_t *fm = &dev->fm; |
| drm_fence_arg_t arg; |
| drm_fence_object_t *fence; |
| drm_user_object_t *uo; |
| unsigned long flags; |
| ret = 0; |
| |
| if (!fm->initialized) { |
| DRM_ERROR("The DRM driver does not support fencing.\n"); |
| return -EINVAL; |
| } |
| |
| DRM_COPY_FROM_USER_IOCTL(arg, (void __user *)data, sizeof(arg)); |
| switch (arg.op) { |
| case drm_fence_create: |
| if (arg.flags & DRM_FENCE_FLAG_EMIT) |
| LOCK_TEST_WITH_RETURN(dev, filp); |
| ret = drm_fence_object_create(dev, arg.type, arg.flags, &fence); |
| if (ret) |
| return ret; |
| ret = drm_fence_add_user_object(priv, fence, |
| arg.flags & |
| DRM_FENCE_FLAG_SHAREABLE); |
| if (ret) { |
| drm_fence_usage_deref_unlocked(dev, fence); |
| return ret; |
| } |
| |
| /* |
| * usage > 0. No need to lock dev->struct_mutex; |
| */ |
| |
| atomic_inc(&fence->usage); |
| arg.handle = fence->base.hash.key; |
| break; |
| case drm_fence_destroy: |
| mutex_lock(&dev->struct_mutex); |
| uo = drm_lookup_user_object(priv, arg.handle); |
| if (!uo || (uo->type != drm_fence_type) || uo->owner != priv) { |
| mutex_unlock(&dev->struct_mutex); |
| return -EINVAL; |
| } |
| ret = drm_remove_user_object(priv, uo); |
| mutex_unlock(&dev->struct_mutex); |
| return ret; |
| case drm_fence_reference: |
| ret = |
| drm_user_object_ref(priv, arg.handle, drm_fence_type, &uo); |
| if (ret) |
| return ret; |
| fence = drm_lookup_fence_object(priv, arg.handle); |
| break; |
| case drm_fence_unreference: |
| ret = drm_user_object_unref(priv, arg.handle, drm_fence_type); |
| return ret; |
| case drm_fence_signaled: |
| fence = drm_lookup_fence_object(priv, arg.handle); |
| if (!fence) |
| return -EINVAL; |
| break; |
| case drm_fence_flush: |
| fence = drm_lookup_fence_object(priv, arg.handle); |
| if (!fence) |
| return -EINVAL; |
| ret = drm_fence_object_flush(dev, fence, arg.type); |
| break; |
| case drm_fence_wait: |
| fence = drm_lookup_fence_object(priv, arg.handle); |
| if (!fence) |
| return -EINVAL; |
| ret = |
| drm_fence_object_wait(dev, fence, |
| arg.flags & DRM_FENCE_FLAG_WAIT_LAZY, |
| 0, arg.type); |
| break; |
| case drm_fence_emit: |
| LOCK_TEST_WITH_RETURN(dev, filp); |
| fence = drm_lookup_fence_object(priv, arg.handle); |
| if (!fence) |
| return -EINVAL; |
| ret = drm_fence_object_emit(dev, fence, arg.flags, arg.type); |
| break; |
| case drm_fence_buffers: |
| if (!dev->bm.initialized) { |
| DRM_ERROR("Buffer object manager is not initialized\n"); |
| return -EINVAL; |
| } |
| LOCK_TEST_WITH_RETURN(dev, filp); |
| ret = drm_fence_buffer_objects(priv, NULL, arg.flags, |
| NULL, &fence); |
| if (ret) |
| return ret; |
| ret = drm_fence_add_user_object(priv, fence, |
| arg.flags & |
| DRM_FENCE_FLAG_SHAREABLE); |
| if (ret) |
| return ret; |
| atomic_inc(&fence->usage); |
| arg.handle = fence->base.hash.key; |
| break; |
| default: |
| return -EINVAL; |
| } |
| read_lock_irqsave(&fm->lock, flags); |
| arg.class = fence->class; |
| arg.type = fence->type; |
| arg.signaled = fence->signaled; |
| read_unlock_irqrestore(&fm->lock, flags); |
| drm_fence_usage_deref_unlocked(dev, fence); |
| |
| DRM_COPY_TO_USER_IOCTL((void __user *)data, arg, sizeof(arg)); |
| return ret; |
| } |