| /* |
| * Copyright 2009 Jerome Glisse. |
| * 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: |
| * Jerome Glisse <glisse@freedesktop.org> |
| * Dave Airlie |
| */ |
| #include <linux/seq_file.h> |
| #include <linux/atomic.h> |
| #include <linux/wait.h> |
| #include <linux/list.h> |
| #include <linux/kref.h> |
| #include <linux/slab.h> |
| #include "drmP.h" |
| #include "drm.h" |
| #include "radeon_reg.h" |
| #include "radeon.h" |
| #include "radeon_trace.h" |
| |
| static void radeon_fence_write(struct radeon_device *rdev, u32 seq) |
| { |
| if (rdev->wb.enabled) { |
| u32 scratch_index; |
| if (rdev->wb.use_event) |
| scratch_index = R600_WB_EVENT_OFFSET + rdev->fence_drv.scratch_reg - rdev->scratch.reg_base; |
| else |
| scratch_index = RADEON_WB_SCRATCH_OFFSET + rdev->fence_drv.scratch_reg - rdev->scratch.reg_base; |
| rdev->wb.wb[scratch_index/4] = cpu_to_le32(seq); |
| } else |
| WREG32(rdev->fence_drv.scratch_reg, seq); |
| } |
| |
| static u32 radeon_fence_read(struct radeon_device *rdev) |
| { |
| u32 seq; |
| |
| if (rdev->wb.enabled) { |
| u32 scratch_index; |
| if (rdev->wb.use_event) |
| scratch_index = R600_WB_EVENT_OFFSET + rdev->fence_drv.scratch_reg - rdev->scratch.reg_base; |
| else |
| scratch_index = RADEON_WB_SCRATCH_OFFSET + rdev->fence_drv.scratch_reg - rdev->scratch.reg_base; |
| seq = le32_to_cpu(rdev->wb.wb[scratch_index/4]); |
| } else |
| seq = RREG32(rdev->fence_drv.scratch_reg); |
| return seq; |
| } |
| |
| int radeon_fence_emit(struct radeon_device *rdev, struct radeon_fence *fence) |
| { |
| unsigned long irq_flags; |
| |
| write_lock_irqsave(&rdev->fence_drv.lock, irq_flags); |
| if (fence->emited) { |
| write_unlock_irqrestore(&rdev->fence_drv.lock, irq_flags); |
| return 0; |
| } |
| fence->seq = atomic_add_return(1, &rdev->fence_drv.seq); |
| if (!rdev->cp.ready) |
| /* FIXME: cp is not running assume everythings is done right |
| * away |
| */ |
| radeon_fence_write(rdev, fence->seq); |
| else |
| radeon_fence_ring_emit(rdev, fence); |
| |
| trace_radeon_fence_emit(rdev->ddev, fence->seq); |
| fence->emited = true; |
| list_move_tail(&fence->list, &rdev->fence_drv.emited); |
| write_unlock_irqrestore(&rdev->fence_drv.lock, irq_flags); |
| return 0; |
| } |
| |
| static bool radeon_fence_poll_locked(struct radeon_device *rdev) |
| { |
| struct radeon_fence *fence; |
| struct list_head *i, *n; |
| uint32_t seq; |
| bool wake = false; |
| unsigned long cjiffies; |
| |
| seq = radeon_fence_read(rdev); |
| if (seq != rdev->fence_drv.last_seq) { |
| rdev->fence_drv.last_seq = seq; |
| rdev->fence_drv.last_jiffies = jiffies; |
| rdev->fence_drv.last_timeout = RADEON_FENCE_JIFFIES_TIMEOUT; |
| } else { |
| cjiffies = jiffies; |
| if (time_after(cjiffies, rdev->fence_drv.last_jiffies)) { |
| cjiffies -= rdev->fence_drv.last_jiffies; |
| if (time_after(rdev->fence_drv.last_timeout, cjiffies)) { |
| /* update the timeout */ |
| rdev->fence_drv.last_timeout -= cjiffies; |
| } else { |
| /* the 500ms timeout is elapsed we should test |
| * for GPU lockup |
| */ |
| rdev->fence_drv.last_timeout = 1; |
| } |
| } else { |
| /* wrap around update last jiffies, we will just wait |
| * a little longer |
| */ |
| rdev->fence_drv.last_jiffies = cjiffies; |
| } |
| return false; |
| } |
| n = NULL; |
| list_for_each(i, &rdev->fence_drv.emited) { |
| fence = list_entry(i, struct radeon_fence, list); |
| if (fence->seq == seq) { |
| n = i; |
| break; |
| } |
| } |
| /* all fence previous to this one are considered as signaled */ |
| if (n) { |
| i = n; |
| do { |
| n = i->prev; |
| list_move_tail(i, &rdev->fence_drv.signaled); |
| fence = list_entry(i, struct radeon_fence, list); |
| fence->signaled = true; |
| i = n; |
| } while (i != &rdev->fence_drv.emited); |
| wake = true; |
| } |
| return wake; |
| } |
| |
| static void radeon_fence_destroy(struct kref *kref) |
| { |
| unsigned long irq_flags; |
| struct radeon_fence *fence; |
| |
| fence = container_of(kref, struct radeon_fence, kref); |
| write_lock_irqsave(&fence->rdev->fence_drv.lock, irq_flags); |
| list_del(&fence->list); |
| fence->emited = false; |
| write_unlock_irqrestore(&fence->rdev->fence_drv.lock, irq_flags); |
| kfree(fence); |
| } |
| |
| int radeon_fence_create(struct radeon_device *rdev, struct radeon_fence **fence) |
| { |
| unsigned long irq_flags; |
| |
| *fence = kmalloc(sizeof(struct radeon_fence), GFP_KERNEL); |
| if ((*fence) == NULL) { |
| return -ENOMEM; |
| } |
| kref_init(&((*fence)->kref)); |
| (*fence)->rdev = rdev; |
| (*fence)->emited = false; |
| (*fence)->signaled = false; |
| (*fence)->seq = 0; |
| INIT_LIST_HEAD(&(*fence)->list); |
| |
| write_lock_irqsave(&rdev->fence_drv.lock, irq_flags); |
| list_add_tail(&(*fence)->list, &rdev->fence_drv.created); |
| write_unlock_irqrestore(&rdev->fence_drv.lock, irq_flags); |
| return 0; |
| } |
| |
| |
| bool radeon_fence_signaled(struct radeon_fence *fence) |
| { |
| unsigned long irq_flags; |
| bool signaled = false; |
| |
| if (!fence) |
| return true; |
| |
| if (fence->rdev->gpu_lockup) |
| return true; |
| |
| write_lock_irqsave(&fence->rdev->fence_drv.lock, irq_flags); |
| signaled = fence->signaled; |
| /* if we are shuting down report all fence as signaled */ |
| if (fence->rdev->shutdown) { |
| signaled = true; |
| } |
| if (!fence->emited) { |
| WARN(1, "Querying an unemited fence : %p !\n", fence); |
| signaled = true; |
| } |
| if (!signaled) { |
| radeon_fence_poll_locked(fence->rdev); |
| signaled = fence->signaled; |
| } |
| write_unlock_irqrestore(&fence->rdev->fence_drv.lock, irq_flags); |
| return signaled; |
| } |
| |
| int radeon_fence_wait(struct radeon_fence *fence, bool intr) |
| { |
| struct radeon_device *rdev; |
| unsigned long irq_flags, timeout; |
| u32 seq; |
| int r; |
| |
| if (fence == NULL) { |
| WARN(1, "Querying an invalid fence : %p !\n", fence); |
| return 0; |
| } |
| rdev = fence->rdev; |
| if (radeon_fence_signaled(fence)) { |
| return 0; |
| } |
| timeout = rdev->fence_drv.last_timeout; |
| retry: |
| /* save current sequence used to check for GPU lockup */ |
| seq = rdev->fence_drv.last_seq; |
| trace_radeon_fence_wait_begin(rdev->ddev, seq); |
| if (intr) { |
| radeon_irq_kms_sw_irq_get(rdev); |
| r = wait_event_interruptible_timeout(rdev->fence_drv.queue, |
| radeon_fence_signaled(fence), timeout); |
| radeon_irq_kms_sw_irq_put(rdev); |
| if (unlikely(r < 0)) { |
| return r; |
| } |
| } else { |
| radeon_irq_kms_sw_irq_get(rdev); |
| r = wait_event_timeout(rdev->fence_drv.queue, |
| radeon_fence_signaled(fence), timeout); |
| radeon_irq_kms_sw_irq_put(rdev); |
| } |
| trace_radeon_fence_wait_end(rdev->ddev, seq); |
| if (unlikely(!radeon_fence_signaled(fence))) { |
| /* we were interrupted for some reason and fence isn't |
| * isn't signaled yet, resume wait |
| */ |
| if (r) { |
| timeout = r; |
| goto retry; |
| } |
| /* don't protect read access to rdev->fence_drv.last_seq |
| * if we experiencing a lockup the value doesn't change |
| */ |
| if (seq == rdev->fence_drv.last_seq && radeon_gpu_is_lockup(rdev)) { |
| /* good news we believe it's a lockup */ |
| printk(KERN_WARNING "GPU lockup (waiting for 0x%08X last fence id 0x%08X)\n", |
| fence->seq, seq); |
| /* FIXME: what should we do ? marking everyone |
| * as signaled for now |
| */ |
| rdev->gpu_lockup = true; |
| r = radeon_gpu_reset(rdev); |
| if (r) |
| return r; |
| radeon_fence_write(rdev, fence->seq); |
| rdev->gpu_lockup = false; |
| } |
| timeout = RADEON_FENCE_JIFFIES_TIMEOUT; |
| write_lock_irqsave(&rdev->fence_drv.lock, irq_flags); |
| rdev->fence_drv.last_timeout = RADEON_FENCE_JIFFIES_TIMEOUT; |
| rdev->fence_drv.last_jiffies = jiffies; |
| write_unlock_irqrestore(&rdev->fence_drv.lock, irq_flags); |
| goto retry; |
| } |
| return 0; |
| } |
| |
| int radeon_fence_wait_next(struct radeon_device *rdev) |
| { |
| unsigned long irq_flags; |
| struct radeon_fence *fence; |
| int r; |
| |
| if (rdev->gpu_lockup) { |
| return 0; |
| } |
| write_lock_irqsave(&rdev->fence_drv.lock, irq_flags); |
| if (list_empty(&rdev->fence_drv.emited)) { |
| write_unlock_irqrestore(&rdev->fence_drv.lock, irq_flags); |
| return 0; |
| } |
| fence = list_entry(rdev->fence_drv.emited.next, |
| struct radeon_fence, list); |
| radeon_fence_ref(fence); |
| write_unlock_irqrestore(&rdev->fence_drv.lock, irq_flags); |
| r = radeon_fence_wait(fence, false); |
| radeon_fence_unref(&fence); |
| return r; |
| } |
| |
| int radeon_fence_wait_last(struct radeon_device *rdev) |
| { |
| unsigned long irq_flags; |
| struct radeon_fence *fence; |
| int r; |
| |
| if (rdev->gpu_lockup) { |
| return 0; |
| } |
| write_lock_irqsave(&rdev->fence_drv.lock, irq_flags); |
| if (list_empty(&rdev->fence_drv.emited)) { |
| write_unlock_irqrestore(&rdev->fence_drv.lock, irq_flags); |
| return 0; |
| } |
| fence = list_entry(rdev->fence_drv.emited.prev, |
| struct radeon_fence, list); |
| radeon_fence_ref(fence); |
| write_unlock_irqrestore(&rdev->fence_drv.lock, irq_flags); |
| r = radeon_fence_wait(fence, false); |
| radeon_fence_unref(&fence); |
| return r; |
| } |
| |
| struct radeon_fence *radeon_fence_ref(struct radeon_fence *fence) |
| { |
| kref_get(&fence->kref); |
| return fence; |
| } |
| |
| void radeon_fence_unref(struct radeon_fence **fence) |
| { |
| struct radeon_fence *tmp = *fence; |
| |
| *fence = NULL; |
| if (tmp) { |
| kref_put(&tmp->kref, radeon_fence_destroy); |
| } |
| } |
| |
| void radeon_fence_process(struct radeon_device *rdev) |
| { |
| unsigned long irq_flags; |
| bool wake; |
| |
| write_lock_irqsave(&rdev->fence_drv.lock, irq_flags); |
| wake = radeon_fence_poll_locked(rdev); |
| write_unlock_irqrestore(&rdev->fence_drv.lock, irq_flags); |
| if (wake) { |
| wake_up_all(&rdev->fence_drv.queue); |
| } |
| } |
| |
| int radeon_fence_driver_init(struct radeon_device *rdev) |
| { |
| unsigned long irq_flags; |
| int r; |
| |
| write_lock_irqsave(&rdev->fence_drv.lock, irq_flags); |
| r = radeon_scratch_get(rdev, &rdev->fence_drv.scratch_reg); |
| if (r) { |
| dev_err(rdev->dev, "fence failed to get scratch register\n"); |
| write_unlock_irqrestore(&rdev->fence_drv.lock, irq_flags); |
| return r; |
| } |
| radeon_fence_write(rdev, 0); |
| atomic_set(&rdev->fence_drv.seq, 0); |
| INIT_LIST_HEAD(&rdev->fence_drv.created); |
| INIT_LIST_HEAD(&rdev->fence_drv.emited); |
| INIT_LIST_HEAD(&rdev->fence_drv.signaled); |
| init_waitqueue_head(&rdev->fence_drv.queue); |
| rdev->fence_drv.initialized = true; |
| write_unlock_irqrestore(&rdev->fence_drv.lock, irq_flags); |
| if (radeon_debugfs_fence_init(rdev)) { |
| dev_err(rdev->dev, "fence debugfs file creation failed\n"); |
| } |
| return 0; |
| } |
| |
| void radeon_fence_driver_fini(struct radeon_device *rdev) |
| { |
| unsigned long irq_flags; |
| |
| if (!rdev->fence_drv.initialized) |
| return; |
| wake_up_all(&rdev->fence_drv.queue); |
| write_lock_irqsave(&rdev->fence_drv.lock, irq_flags); |
| radeon_scratch_free(rdev, rdev->fence_drv.scratch_reg); |
| write_unlock_irqrestore(&rdev->fence_drv.lock, irq_flags); |
| rdev->fence_drv.initialized = false; |
| } |
| |
| |
| /* |
| * Fence debugfs |
| */ |
| #if defined(CONFIG_DEBUG_FS) |
| static int radeon_debugfs_fence_info(struct seq_file *m, void *data) |
| { |
| struct drm_info_node *node = (struct drm_info_node *)m->private; |
| struct drm_device *dev = node->minor->dev; |
| struct radeon_device *rdev = dev->dev_private; |
| struct radeon_fence *fence; |
| |
| seq_printf(m, "Last signaled fence 0x%08X\n", |
| radeon_fence_read(rdev)); |
| if (!list_empty(&rdev->fence_drv.emited)) { |
| fence = list_entry(rdev->fence_drv.emited.prev, |
| struct radeon_fence, list); |
| seq_printf(m, "Last emited fence %p with 0x%08X\n", |
| fence, fence->seq); |
| } |
| return 0; |
| } |
| |
| static struct drm_info_list radeon_debugfs_fence_list[] = { |
| {"radeon_fence_info", &radeon_debugfs_fence_info, 0, NULL}, |
| }; |
| #endif |
| |
| int radeon_debugfs_fence_init(struct radeon_device *rdev) |
| { |
| #if defined(CONFIG_DEBUG_FS) |
| return radeon_debugfs_add_files(rdev, radeon_debugfs_fence_list, 1); |
| #else |
| return 0; |
| #endif |
| } |