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  1. /*
  2.  * Copyright 2009 Jerome Glisse.
  3.  * All Rights Reserved.
  4.  *
  5.  * Permission is hereby granted, free of charge, to any person obtaining a
  6.  * copy of this software and associated documentation files (the
  7.  * "Software"), to deal in the Software without restriction, including
  8.  * without limitation the rights to use, copy, modify, merge, publish,
  9.  * distribute, sub license, and/or sell copies of the Software, and to
  10.  * permit persons to whom the Software is furnished to do so, subject to
  11.  * the following conditions:
  12.  *
  13.  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  14.  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  15.  * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
  16.  * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
  17.  * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
  18.  * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
  19.  * USE OR OTHER DEALINGS IN THE SOFTWARE.
  20.  *
  21.  * The above copyright notice and this permission notice (including the
  22.  * next paragraph) shall be included in all copies or substantial portions
  23.  * of the Software.
  24.  *
  25.  */
  26. /*
  27.  * Authors:
  28.  *    Jerome Glisse <glisse@freedesktop.org>
  29.  *    Dave Airlie
  30.  */
  31. #include <linux/seq_file.h>
  32. #include <asm/atomic.h>
  33. #include <linux/wait.h>
  34. #include <linux/list.h>
  35. #include <linux/kref.h>
  36. #include "drmP.h"
  37. #include "drm.h"
  38. #include "radeon_reg.h"
  39. #include "radeon.h"
  40.  
  41. int radeon_fence_emit(struct radeon_device *rdev, struct radeon_fence *fence)
  42. {
  43.         unsigned long irq_flags;
  44.  
  45.         write_lock_irqsave(&rdev->fence_drv.lock, irq_flags);
  46.         if (fence->emited) {
  47.                 write_unlock_irqrestore(&rdev->fence_drv.lock, irq_flags);
  48.                 return 0;
  49.         }
  50.         fence->seq = atomic_add_return(1, &rdev->fence_drv.seq);
  51.         if (!rdev->cp.ready) {
  52.                 /* FIXME: cp is not running assume everythings is done right
  53.                  * away
  54.                  */
  55.                 WREG32(rdev->fence_drv.scratch_reg, fence->seq);
  56.         } else {
  57.                 radeon_fence_ring_emit(rdev, fence);
  58.         }
  59.         fence->emited = true;
  60.         fence->timeout = jiffies + ((2000 * HZ) / 1000);
  61.         list_del(&fence->list);
  62.         list_add_tail(&fence->list, &rdev->fence_drv.emited);
  63.         write_unlock_irqrestore(&rdev->fence_drv.lock, irq_flags);
  64.         return 0;
  65. }
  66.  
  67. static bool radeon_fence_poll_locked(struct radeon_device *rdev)
  68. {
  69.         struct radeon_fence *fence;
  70.         struct list_head *i, *n;
  71.         uint32_t seq;
  72.         bool wake = false;
  73.  
  74.         if (rdev == NULL) {
  75.                 return true;
  76.         }
  77.         if (rdev->shutdown) {
  78.                 return true;
  79.         }
  80.         seq = RREG32(rdev->fence_drv.scratch_reg);
  81.         rdev->fence_drv.last_seq = seq;
  82.         n = NULL;
  83.         list_for_each(i, &rdev->fence_drv.emited) {
  84.                 fence = list_entry(i, struct radeon_fence, list);
  85.                 if (fence->seq == seq) {
  86.                         n = i;
  87.                         break;
  88.                 }
  89.         }
  90.         /* all fence previous to this one are considered as signaled */
  91.         if (n) {
  92.                 i = n;
  93.                 do {
  94.                         n = i->prev;
  95.                         list_del(i);
  96.                         list_add_tail(i, &rdev->fence_drv.signaled);
  97.                         fence = list_entry(i, struct radeon_fence, list);
  98.                         fence->signaled = true;
  99.                         i = n;
  100.                 } while (i != &rdev->fence_drv.emited);
  101.                 wake = true;
  102.         }
  103.         return wake;
  104. }
  105.  
  106. static void radeon_fence_destroy(struct kref *kref)
  107. {
  108.         unsigned long irq_flags;
  109.         struct radeon_fence *fence;
  110.  
  111.         fence = container_of(kref, struct radeon_fence, kref);
  112.         write_lock_irqsave(&fence->rdev->fence_drv.lock, irq_flags);
  113.         list_del(&fence->list);
  114.         fence->emited = false;
  115.         write_unlock_irqrestore(&fence->rdev->fence_drv.lock, irq_flags);
  116.         kfree(fence);
  117. }
  118.  
  119. int radeon_fence_create(struct radeon_device *rdev, struct radeon_fence **fence)
  120. {
  121.         unsigned long irq_flags;
  122.  
  123.         *fence = kmalloc(sizeof(struct radeon_fence), GFP_KERNEL);
  124.         if ((*fence) == NULL) {
  125.                 return -ENOMEM;
  126.         }
  127.         kref_init(&((*fence)->kref));
  128.         (*fence)->rdev = rdev;
  129.         (*fence)->emited = false;
  130.         (*fence)->signaled = false;
  131.         (*fence)->seq = 0;
  132.         INIT_LIST_HEAD(&(*fence)->list);
  133.  
  134.         write_lock_irqsave(&rdev->fence_drv.lock, irq_flags);
  135.         list_add_tail(&(*fence)->list, &rdev->fence_drv.created);
  136.         write_unlock_irqrestore(&rdev->fence_drv.lock, irq_flags);
  137.         return 0;
  138. }
  139.  
  140.  
  141. bool radeon_fence_signaled(struct radeon_fence *fence)
  142. {
  143.         struct radeon_device *rdev = fence->rdev;
  144.         unsigned long irq_flags;
  145.         bool signaled = false;
  146.  
  147.         if (rdev->gpu_lockup) {
  148.                 return true;
  149.         }
  150.         if (fence == NULL) {
  151.                 return true;
  152.         }
  153.         write_lock_irqsave(&fence->rdev->fence_drv.lock, irq_flags);
  154.         signaled = fence->signaled;
  155.         /* if we are shuting down report all fence as signaled */
  156.         if (fence->rdev->shutdown) {
  157.                 signaled = true;
  158.         }
  159.         if (!fence->emited) {
  160.                 WARN(1, "Querying an unemited fence : %p !\n", fence);
  161.                 signaled = true;
  162.         }
  163.         if (!signaled) {
  164.                 radeon_fence_poll_locked(fence->rdev);
  165.                 signaled = fence->signaled;
  166.         }
  167.         write_unlock_irqrestore(&fence->rdev->fence_drv.lock, irq_flags);
  168.         return signaled;
  169. }
  170.  
  171. int radeon_fence_wait(struct radeon_fence *fence, bool interruptible)
  172. {
  173.         struct radeon_device *rdev;
  174.         unsigned long cur_jiffies;
  175.         unsigned long timeout;
  176.         bool expired = false;
  177.         int r;
  178.  
  179.  
  180.         if (fence == NULL) {
  181.                 WARN(1, "Querying an invalid fence : %p !\n", fence);
  182.                 return 0;
  183.         }
  184.         rdev = fence->rdev;
  185.         if (radeon_fence_signaled(fence)) {
  186.                 return 0;
  187.         }
  188. retry:
  189.         cur_jiffies = jiffies;
  190.         timeout = HZ / 100;
  191.         if (time_after(fence->timeout, cur_jiffies)) {
  192.                 timeout = fence->timeout - cur_jiffies;
  193.         }
  194.         if (interruptible) {
  195.                 r = wait_event_interruptible_timeout(rdev->fence_drv.queue,
  196.                                 radeon_fence_signaled(fence), timeout);
  197.                 if (unlikely(r == -ERESTARTSYS)) {
  198.                         return -ERESTART;
  199.                 }
  200.         } else {
  201.                 r = wait_event_timeout(rdev->fence_drv.queue,
  202.                          radeon_fence_signaled(fence), timeout);
  203.         }
  204.         if (unlikely(!radeon_fence_signaled(fence))) {
  205.                 if (unlikely(r == 0)) {
  206.                         expired = true;
  207.                 }
  208.                 if (unlikely(expired)) {
  209.                         timeout = 1;
  210.                         if (time_after(cur_jiffies, fence->timeout)) {
  211.                                 timeout = cur_jiffies - fence->timeout;
  212.                         }
  213.                         timeout = jiffies_to_msecs(timeout);
  214.                         if (timeout > 500) {
  215.                                 DRM_ERROR("fence(%p:0x%08X) %lums timeout "
  216.                                           "going to reset GPU\n",
  217.                                           fence, fence->seq, timeout);
  218.                                 radeon_gpu_reset(rdev);
  219.                                 WREG32(rdev->fence_drv.scratch_reg, fence->seq);
  220.                         }
  221.                 }
  222.                 goto retry;
  223.         }
  224.         if (unlikely(expired)) {
  225.                 rdev->fence_drv.count_timeout++;
  226.                 cur_jiffies = jiffies;
  227.                 timeout = 1;
  228.                 if (time_after(cur_jiffies, fence->timeout)) {
  229.                         timeout = cur_jiffies - fence->timeout;
  230.                 }
  231.                 timeout = jiffies_to_msecs(timeout);
  232.                 DRM_ERROR("fence(%p:0x%08X) %lums timeout\n",
  233.                           fence, fence->seq, timeout);
  234.                 DRM_ERROR("last signaled fence(0x%08X)\n",
  235.                           rdev->fence_drv.last_seq);
  236.         }
  237.         return 0;
  238. }
  239.  
  240. int radeon_fence_wait_next(struct radeon_device *rdev)
  241. {
  242.         unsigned long irq_flags;
  243.         struct radeon_fence *fence;
  244.         int r;
  245.  
  246.         if (rdev->gpu_lockup) {
  247.                 return 0;
  248.         }
  249.         write_lock_irqsave(&rdev->fence_drv.lock, irq_flags);
  250.         if (list_empty(&rdev->fence_drv.emited)) {
  251.                 write_unlock_irqrestore(&rdev->fence_drv.lock, irq_flags);
  252.                 return 0;
  253.         }
  254.         fence = list_entry(rdev->fence_drv.emited.next,
  255.                            struct radeon_fence, list);
  256.         radeon_fence_ref(fence);
  257.         write_unlock_irqrestore(&rdev->fence_drv.lock, irq_flags);
  258.         r = radeon_fence_wait(fence, false);
  259.         radeon_fence_unref(&fence);
  260.         return r;
  261. }
  262.  
  263. int radeon_fence_wait_last(struct radeon_device *rdev)
  264. {
  265.         unsigned long irq_flags;
  266.         struct radeon_fence *fence;
  267.         int r;
  268.  
  269.         if (rdev->gpu_lockup) {
  270.                 return 0;
  271.         }
  272.         write_lock_irqsave(&rdev->fence_drv.lock, irq_flags);
  273.         if (list_empty(&rdev->fence_drv.emited)) {
  274.                 write_unlock_irqrestore(&rdev->fence_drv.lock, irq_flags);
  275.                 return 0;
  276.         }
  277.         fence = list_entry(rdev->fence_drv.emited.prev,
  278.                            struct radeon_fence, list);
  279.         radeon_fence_ref(fence);
  280.         write_unlock_irqrestore(&rdev->fence_drv.lock, irq_flags);
  281.         r = radeon_fence_wait(fence, false);
  282.         radeon_fence_unref(&fence);
  283.         return r;
  284. }
  285.  
  286. struct radeon_fence *radeon_fence_ref(struct radeon_fence *fence)
  287. {
  288.         kref_get(&fence->kref);
  289.         return fence;
  290. }
  291.  
  292. void radeon_fence_unref(struct radeon_fence **fence)
  293. {
  294.         struct radeon_fence *tmp = *fence;
  295.  
  296.         *fence = NULL;
  297.         if (tmp) {
  298.                 kref_put(&tmp->kref, &radeon_fence_destroy);
  299.         }
  300. }
  301.  
  302. void radeon_fence_process(struct radeon_device *rdev)
  303. {
  304.         unsigned long irq_flags;
  305.         bool wake;
  306.  
  307.         write_lock_irqsave(&rdev->fence_drv.lock, irq_flags);
  308.         wake = radeon_fence_poll_locked(rdev);
  309.         write_unlock_irqrestore(&rdev->fence_drv.lock, irq_flags);
  310.         if (wake) {
  311.                 wake_up_all(&rdev->fence_drv.queue);
  312.         }
  313. }
  314.  
  315. int radeon_fence_driver_init(struct radeon_device *rdev)
  316. {
  317.         unsigned long irq_flags;
  318.         int r;
  319.  
  320.         write_lock_irqsave(&rdev->fence_drv.lock, irq_flags);
  321.         r = radeon_scratch_get(rdev, &rdev->fence_drv.scratch_reg);
  322.         if (r) {
  323.                 DRM_ERROR("Fence failed to get a scratch register.");
  324.                 write_unlock_irqrestore(&rdev->fence_drv.lock, irq_flags);
  325.                 return r;
  326.         }
  327.         WREG32(rdev->fence_drv.scratch_reg, 0);
  328.         atomic_set(&rdev->fence_drv.seq, 0);
  329.         INIT_LIST_HEAD(&rdev->fence_drv.created);
  330.         INIT_LIST_HEAD(&rdev->fence_drv.emited);
  331.         INIT_LIST_HEAD(&rdev->fence_drv.signaled);
  332.         rdev->fence_drv.count_timeout = 0;
  333.         init_waitqueue_head(&rdev->fence_drv.queue);
  334.         write_unlock_irqrestore(&rdev->fence_drv.lock, irq_flags);
  335.         if (radeon_debugfs_fence_init(rdev)) {
  336.                 DRM_ERROR("Failed to register debugfs file for fence !\n");
  337.         }
  338.         return 0;
  339. }
  340.  
  341. void radeon_fence_driver_fini(struct radeon_device *rdev)
  342. {
  343.         unsigned long irq_flags;
  344.  
  345.         wake_up_all(&rdev->fence_drv.queue);
  346.         write_lock_irqsave(&rdev->fence_drv.lock, irq_flags);
  347.         radeon_scratch_free(rdev, rdev->fence_drv.scratch_reg);
  348.         write_unlock_irqrestore(&rdev->fence_drv.lock, irq_flags);
  349.         DRM_INFO("radeon: fence finalized\n");
  350. }
  351.  
  352.  
  353. /*
  354.  * Fence debugfs
  355.  */
  356. #if defined(CONFIG_DEBUG_FS)
  357. static int radeon_debugfs_fence_info(struct seq_file *m, void *data)
  358. {
  359.         struct drm_info_node *node = (struct drm_info_node *)m->private;
  360.         struct drm_device *dev = node->minor->dev;
  361.         struct radeon_device *rdev = dev->dev_private;
  362.         struct radeon_fence *fence;
  363.  
  364.         seq_printf(m, "Last signaled fence 0x%08X\n",
  365.                    RREG32(rdev->fence_drv.scratch_reg));
  366.         if (!list_empty(&rdev->fence_drv.emited)) {
  367.                    fence = list_entry(rdev->fence_drv.emited.prev,
  368.                                       struct radeon_fence, list);
  369.                    seq_printf(m, "Last emited fence %p with 0x%08X\n",
  370.                               fence,  fence->seq);
  371.         }
  372.         return 0;
  373. }
  374.  
  375. static struct drm_info_list radeon_debugfs_fence_list[] = {
  376.         {"radeon_fence_info", &radeon_debugfs_fence_info, 0, NULL},
  377. };
  378. #endif
  379.  
  380. int radeon_debugfs_fence_init(struct radeon_device *rdev)
  381. {
  382. #if defined(CONFIG_DEBUG_FS)
  383.         return radeon_debugfs_add_files(rdev, radeon_debugfs_fence_list, 1);
  384. #else
  385.         return 0;
  386. #endif
  387. }
  388.