diff options
Diffstat (limited to 'drivers/gpu/drm/radeon/radeon_fence.c')
| -rw-r--r-- | drivers/gpu/drm/radeon/radeon_fence.c | 767 |
1 files changed, 498 insertions, 269 deletions
diff --git a/drivers/gpu/drm/radeon/radeon_fence.c b/drivers/gpu/drm/radeon/radeon_fence.c index 11f5f402d22..913787085df 100644 --- a/drivers/gpu/drm/radeon/radeon_fence.c +++ b/drivers/gpu/drm/radeon/radeon_fence.c @@ -31,51 +31,112 @@ #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 <linux/firmware.h> +#include <drm/drmP.h> #include "radeon_reg.h" #include "radeon.h" #include "radeon_trace.h" +/* + * Fences + * Fences mark an event in the GPUs pipeline and are used + * for GPU/CPU synchronization. When the fence is written, + * it is expected that all buffers associated with that fence + * are no longer in use by the associated ring on the GPU and + * that the the relevant GPU caches have been flushed. Whether + * we use a scratch register or memory location depends on the asic + * and whether writeback is enabled. + */ + +/** + * radeon_fence_write - write a fence value + * + * @rdev: radeon_device pointer + * @seq: sequence number to write + * @ring: ring index the fence is associated with + * + * Writes a fence value to memory or a scratch register (all asics). + */ static void radeon_fence_write(struct radeon_device *rdev, u32 seq, int ring) { - if (rdev->wb.enabled) { - *rdev->fence_drv[ring].cpu_addr = cpu_to_le32(seq); + struct radeon_fence_driver *drv = &rdev->fence_drv[ring]; + if (likely(rdev->wb.enabled || !drv->scratch_reg)) { + if (drv->cpu_addr) { + *drv->cpu_addr = cpu_to_le32(seq); + } } else { - WREG32(rdev->fence_drv[ring].scratch_reg, seq); + WREG32(drv->scratch_reg, seq); } } +/** + * radeon_fence_read - read a fence value + * + * @rdev: radeon_device pointer + * @ring: ring index the fence is associated with + * + * Reads a fence value from memory or a scratch register (all asics). + * Returns the value of the fence read from memory or register. + */ static u32 radeon_fence_read(struct radeon_device *rdev, int ring) { + struct radeon_fence_driver *drv = &rdev->fence_drv[ring]; u32 seq = 0; - if (rdev->wb.enabled) { - seq = le32_to_cpu(*rdev->fence_drv[ring].cpu_addr); + if (likely(rdev->wb.enabled || !drv->scratch_reg)) { + if (drv->cpu_addr) { + seq = le32_to_cpu(*drv->cpu_addr); + } else { + seq = lower_32_bits(atomic64_read(&drv->last_seq)); + } } else { - seq = RREG32(rdev->fence_drv[ring].scratch_reg); + seq = RREG32(drv->scratch_reg); } return seq; } -int radeon_fence_emit(struct radeon_device *rdev, struct radeon_fence *fence) +/** + * radeon_fence_emit - emit a fence on the requested ring + * + * @rdev: radeon_device pointer + * @fence: radeon fence object + * @ring: ring index the fence is associated with + * + * Emits a fence command on the requested ring (all asics). + * Returns 0 on success, -ENOMEM on failure. + */ +int radeon_fence_emit(struct radeon_device *rdev, + struct radeon_fence **fence, + int ring) { /* we are protected by the ring emission mutex */ - if (fence->seq && fence->seq < RADEON_FENCE_NOTEMITED_SEQ) { - return 0; + *fence = kmalloc(sizeof(struct radeon_fence), GFP_KERNEL); + if ((*fence) == NULL) { + return -ENOMEM; } - fence->seq = ++rdev->fence_drv[fence->ring].seq; - radeon_fence_ring_emit(rdev, fence->ring, fence); - trace_radeon_fence_emit(rdev->ddev, fence->seq); + kref_init(&((*fence)->kref)); + (*fence)->rdev = rdev; + (*fence)->seq = ++rdev->fence_drv[ring].sync_seq[ring]; + (*fence)->ring = ring; + radeon_fence_ring_emit(rdev, ring, *fence); + trace_radeon_fence_emit(rdev->ddev, ring, (*fence)->seq); return 0; } +/** + * radeon_fence_process - process a fence + * + * @rdev: radeon_device pointer + * @ring: ring index the fence is associated with + * + * Checks the current fence value and wakes the fence queue + * if the sequence number has increased (all asics). + */ void radeon_fence_process(struct radeon_device *rdev, int ring) { - uint64_t seq, last_seq; + uint64_t seq, last_seq, last_emitted; unsigned count_loop = 0; bool wake = false; @@ -102,13 +163,15 @@ void radeon_fence_process(struct radeon_device *rdev, int ring) */ last_seq = atomic64_read(&rdev->fence_drv[ring].last_seq); do { + last_emitted = rdev->fence_drv[ring].sync_seq[ring]; seq = radeon_fence_read(rdev, ring); seq |= last_seq & 0xffffffff00000000LL; if (seq < last_seq) { - seq += 0x100000000LL; + seq &= 0xffffffff; + seq |= last_emitted & 0xffffffff00000000LL; } - if (seq == last_seq) { + if (seq <= last_seq || seq > last_emitted) { break; } /* If we loop over we don't want to return without @@ -127,36 +190,39 @@ void radeon_fence_process(struct radeon_device *rdev, int ring) } } while (atomic64_xchg(&rdev->fence_drv[ring].last_seq, seq) > seq); - if (wake) { - rdev->fence_drv[ring].last_activity = jiffies; + if (wake) wake_up_all(&rdev->fence_queue); - } } +/** + * radeon_fence_destroy - destroy a fence + * + * @kref: fence kref + * + * Frees the fence object (all asics). + */ static void radeon_fence_destroy(struct kref *kref) { struct radeon_fence *fence; fence = container_of(kref, struct radeon_fence, kref); - fence->seq = RADEON_FENCE_NOTEMITED_SEQ; kfree(fence); } -int radeon_fence_create(struct radeon_device *rdev, - struct radeon_fence **fence, - int ring) -{ - *fence = kmalloc(sizeof(struct radeon_fence), GFP_KERNEL); - if ((*fence) == NULL) { - return -ENOMEM; - } - kref_init(&((*fence)->kref)); - (*fence)->rdev = rdev; - (*fence)->seq = RADEON_FENCE_NOTEMITED_SEQ; - (*fence)->ring = ring; - return 0; -} - +/** + * radeon_fence_seq_signaled - check if a fence sequence number has signaled + * + * @rdev: radeon device pointer + * @seq: sequence number + * @ring: ring index the fence is associated with + * + * Check if the last signaled fence sequnce number is >= the requested + * sequence number (all asics). + * Returns true if the fence has signaled (current fence value + * is >= requested value) or false if it has not (current fence + * value is < the requested value. Helper function for + * radeon_fence_signaled(). + */ static bool radeon_fence_seq_signaled(struct radeon_device *rdev, u64 seq, unsigned ring) { @@ -171,15 +237,19 @@ static bool radeon_fence_seq_signaled(struct radeon_device *rdev, return false; } +/** + * radeon_fence_signaled - check if a fence has signaled + * + * @fence: radeon fence object + * + * Check if the requested fence has signaled (all asics). + * Returns true if the fence has signaled or false if it has not. + */ bool radeon_fence_signaled(struct radeon_fence *fence) { if (!fence) { return true; } - if (fence->seq == RADEON_FENCE_NOTEMITED_SEQ) { - WARN(1, "Querying an unemitted fence : %p !\n", fence); - return true; - } if (fence->seq == RADEON_FENCE_SIGNALED_SEQ) { return true; } @@ -190,103 +260,142 @@ bool radeon_fence_signaled(struct radeon_fence *fence) return false; } -static int radeon_fence_wait_seq(struct radeon_device *rdev, u64 target_seq, - unsigned ring, bool intr, bool lock_ring) +/** + * radeon_fence_any_seq_signaled - check if any sequence number is signaled + * + * @rdev: radeon device pointer + * @seq: sequence numbers + * + * Check if the last signaled fence sequnce number is >= the requested + * sequence number (all asics). + * Returns true if any has signaled (current value is >= requested value) + * or false if it has not. Helper function for radeon_fence_wait_seq. + */ +static bool radeon_fence_any_seq_signaled(struct radeon_device *rdev, u64 *seq) { - unsigned long timeout, last_activity; - uint64_t seq; unsigned i; + + for (i = 0; i < RADEON_NUM_RINGS; ++i) { + if (seq[i] && radeon_fence_seq_signaled(rdev, seq[i], i)) + return true; + } + return false; +} + +/** + * radeon_fence_wait_seq - wait for a specific sequence numbers + * + * @rdev: radeon device pointer + * @target_seq: sequence number(s) we want to wait for + * @intr: use interruptable sleep + * + * Wait for the requested sequence number(s) to be written by any ring + * (all asics). Sequnce number array is indexed by ring id. + * @intr selects whether to use interruptable (true) or non-interruptable + * (false) sleep when waiting for the sequence number. Helper function + * for radeon_fence_wait_*(). + * Returns 0 if the sequence number has passed, error for all other cases. + * -EDEADLK is returned when a GPU lockup has been detected. + */ +static int radeon_fence_wait_seq(struct radeon_device *rdev, u64 *target_seq, + bool intr) +{ + uint64_t last_seq[RADEON_NUM_RINGS]; bool signaled; - int r; + int i, r; + + while (!radeon_fence_any_seq_signaled(rdev, target_seq)) { + + /* Save current sequence values, used to check for GPU lockups */ + for (i = 0; i < RADEON_NUM_RINGS; ++i) { + if (!target_seq[i]) + continue; - while (target_seq > atomic64_read(&rdev->fence_drv[ring].last_seq)) { - if (!rdev->ring[ring].ready) { - return -EBUSY; + last_seq[i] = atomic64_read(&rdev->fence_drv[i].last_seq); + trace_radeon_fence_wait_begin(rdev->ddev, i, target_seq[i]); + radeon_irq_kms_sw_irq_get(rdev, i); } - timeout = jiffies - RADEON_FENCE_JIFFIES_TIMEOUT; - if (time_after(rdev->fence_drv[ring].last_activity, timeout)) { - /* the normal case, timeout is somewhere before last_activity */ - timeout = rdev->fence_drv[ring].last_activity - timeout; + if (intr) { + r = wait_event_interruptible_timeout(rdev->fence_queue, ( + (signaled = radeon_fence_any_seq_signaled(rdev, target_seq)) + || rdev->needs_reset), RADEON_FENCE_JIFFIES_TIMEOUT); } else { - /* either jiffies wrapped around, or no fence was signaled in the last 500ms - * anyway we will just wait for the minimum amount and then check for a lockup - */ - timeout = 1; + r = wait_event_timeout(rdev->fence_queue, ( + (signaled = radeon_fence_any_seq_signaled(rdev, target_seq)) + || rdev->needs_reset), RADEON_FENCE_JIFFIES_TIMEOUT); } - seq = atomic64_read(&rdev->fence_drv[ring].last_seq); - /* Save current last activity valuee, used to check for GPU lockups */ - last_activity = rdev->fence_drv[ring].last_activity; - trace_radeon_fence_wait_begin(rdev->ddev, seq); - radeon_irq_kms_sw_irq_get(rdev, ring); - if (intr) { - r = wait_event_interruptible_timeout(rdev->fence_queue, - (signaled = radeon_fence_seq_signaled(rdev, target_seq, ring)), - timeout); - } else { - r = wait_event_timeout(rdev->fence_queue, - (signaled = radeon_fence_seq_signaled(rdev, target_seq, ring)), - timeout); + for (i = 0; i < RADEON_NUM_RINGS; ++i) { + if (!target_seq[i]) + continue; + + radeon_irq_kms_sw_irq_put(rdev, i); + trace_radeon_fence_wait_end(rdev->ddev, i, target_seq[i]); } - radeon_irq_kms_sw_irq_put(rdev, ring); - if (unlikely(r < 0)) { + + if (unlikely(r < 0)) return r; - } - trace_radeon_fence_wait_end(rdev->ddev, seq); if (unlikely(!signaled)) { + if (rdev->needs_reset) + return -EDEADLK; + /* we were interrupted for some reason and fence * isn't signaled yet, resume waiting */ - if (r) { + if (r) continue; - } - /* check if sequence value has changed since last_activity */ - if (seq != atomic64_read(&rdev->fence_drv[ring].last_seq)) { - continue; - } + for (i = 0; i < RADEON_NUM_RINGS; ++i) { + if (!target_seq[i]) + continue; - if (lock_ring) { - mutex_lock(&rdev->ring_lock); + if (last_seq[i] != atomic64_read(&rdev->fence_drv[i].last_seq)) + break; } - /* test if somebody else has already decided that this is a lockup */ - if (last_activity != rdev->fence_drv[ring].last_activity) { - if (lock_ring) { - mutex_unlock(&rdev->ring_lock); - } + if (i != RADEON_NUM_RINGS) continue; + + for (i = 0; i < RADEON_NUM_RINGS; ++i) { + if (!target_seq[i]) + continue; + + if (radeon_ring_is_lockup(rdev, i, &rdev->ring[i])) + break; } - if (radeon_ring_is_lockup(rdev, ring, &rdev->ring[ring])) { + if (i < RADEON_NUM_RINGS) { /* good news we believe it's a lockup */ - dev_warn(rdev->dev, "GPU lockup (waiting for 0x%016llx last fence id 0x%016llx)\n", - target_seq, seq); - - /* change last activity so nobody else think there is a lockup */ - for (i = 0; i < RADEON_NUM_RINGS; ++i) { - rdev->fence_drv[i].last_activity = jiffies; - } - - /* mark the ring as not ready any more */ - rdev->ring[ring].ready = false; - if (lock_ring) { - mutex_unlock(&rdev->ring_lock); - } + dev_warn(rdev->dev, "GPU lockup (waiting for " + "0x%016llx last fence id 0x%016llx on" + " ring %d)\n", + target_seq[i], last_seq[i], i); + + /* remember that we need an reset */ + rdev->needs_reset = true; + wake_up_all(&rdev->fence_queue); return -EDEADLK; } - - if (lock_ring) { - mutex_unlock(&rdev->ring_lock); - } } } return 0; } +/** + * radeon_fence_wait - wait for a fence to signal + * + * @fence: radeon fence object + * @intr: use interruptable sleep + * + * Wait for the requested fence to signal (all asics). + * @intr selects whether to use interruptable (true) or non-interruptable + * (false) sleep when waiting for the fence. + * Returns 0 if the fence has passed, error for all other cases. + */ int radeon_fence_wait(struct radeon_fence *fence, bool intr) { + uint64_t seq[RADEON_NUM_RINGS] = {}; int r; if (fence == NULL) { @@ -294,142 +403,37 @@ int radeon_fence_wait(struct radeon_fence *fence, bool intr) return -EINVAL; } - r = radeon_fence_wait_seq(fence->rdev, fence->seq, - fence->ring, intr, true); - if (r) { - return r; - } - fence->seq = RADEON_FENCE_SIGNALED_SEQ; - return 0; -} - -bool radeon_fence_any_seq_signaled(struct radeon_device *rdev, u64 *seq) -{ - unsigned i; - - for (i = 0; i < RADEON_NUM_RINGS; ++i) { - if (seq[i] && radeon_fence_seq_signaled(rdev, seq[i], i)) { - return true; - } - } - return false; -} - -static int radeon_fence_wait_any_seq(struct radeon_device *rdev, - u64 *target_seq, bool intr) -{ - unsigned long timeout, last_activity, tmp; - unsigned i, ring = RADEON_NUM_RINGS; - bool signaled; - int r; - - for (i = 0, last_activity = 0; i < RADEON_NUM_RINGS; ++i) { - if (!target_seq[i]) { - continue; - } - - /* use the most recent one as indicator */ - if (time_after(rdev->fence_drv[i].last_activity, last_activity)) { - last_activity = rdev->fence_drv[i].last_activity; - } - - /* For lockup detection just pick the lowest ring we are - * actively waiting for - */ - if (i < ring) { - ring = i; - } - } - - /* nothing to wait for ? */ - if (ring == RADEON_NUM_RINGS) { + seq[fence->ring] = fence->seq; + if (seq[fence->ring] == RADEON_FENCE_SIGNALED_SEQ) return 0; - } - - while (!radeon_fence_any_seq_signaled(rdev, target_seq)) { - timeout = jiffies - RADEON_FENCE_JIFFIES_TIMEOUT; - if (time_after(last_activity, timeout)) { - /* the normal case, timeout is somewhere before last_activity */ - timeout = last_activity - timeout; - } else { - /* either jiffies wrapped around, or no fence was signaled in the last 500ms - * anyway we will just wait for the minimum amount and then check for a lockup - */ - timeout = 1; - } - trace_radeon_fence_wait_begin(rdev->ddev, target_seq[ring]); - for (i = 0; i < RADEON_NUM_RINGS; ++i) { - if (target_seq[i]) { - radeon_irq_kms_sw_irq_get(rdev, i); - } - } - if (intr) { - r = wait_event_interruptible_timeout(rdev->fence_queue, - (signaled = radeon_fence_any_seq_signaled(rdev, target_seq)), - timeout); - } else { - r = wait_event_timeout(rdev->fence_queue, - (signaled = radeon_fence_any_seq_signaled(rdev, target_seq)), - timeout); - } - for (i = 0; i < RADEON_NUM_RINGS; ++i) { - if (target_seq[i]) { - radeon_irq_kms_sw_irq_put(rdev, i); - } - } - if (unlikely(r < 0)) { - return r; - } - trace_radeon_fence_wait_end(rdev->ddev, target_seq[ring]); - - if (unlikely(!signaled)) { - /* we were interrupted for some reason and fence - * isn't signaled yet, resume waiting */ - if (r) { - continue; - } - - mutex_lock(&rdev->ring_lock); - for (i = 0, tmp = 0; i < RADEON_NUM_RINGS; ++i) { - if (time_after(rdev->fence_drv[i].last_activity, tmp)) { - tmp = rdev->fence_drv[i].last_activity; - } - } - /* test if somebody else has already decided that this is a lockup */ - if (last_activity != tmp) { - last_activity = tmp; - mutex_unlock(&rdev->ring_lock); - continue; - } - - if (radeon_ring_is_lockup(rdev, ring, &rdev->ring[ring])) { - /* good news we believe it's a lockup */ - dev_warn(rdev->dev, "GPU lockup (waiting for 0x%016llx)\n", - target_seq[ring]); - - /* change last activity so nobody else think there is a lockup */ - for (i = 0; i < RADEON_NUM_RINGS; ++i) { - rdev->fence_drv[i].last_activity = jiffies; - } + r = radeon_fence_wait_seq(fence->rdev, seq, intr); + if (r) + return r; - /* mark the ring as not ready any more */ - rdev->ring[ring].ready = false; - mutex_unlock(&rdev->ring_lock); - return -EDEADLK; - } - mutex_unlock(&rdev->ring_lock); - } - } + fence->seq = RADEON_FENCE_SIGNALED_SEQ; return 0; } +/** + * radeon_fence_wait_any - wait for a fence to signal on any ring + * + * @rdev: radeon device pointer + * @fences: radeon fence object(s) + * @intr: use interruptable sleep + * + * Wait for any requested fence to signal (all asics). Fence + * array is indexed by ring id. @intr selects whether to use + * interruptable (true) or non-interruptable (false) sleep when + * waiting for the fences. Used by the suballocator. + * Returns 0 if any fence has passed, error for all other cases. + */ int radeon_fence_wait_any(struct radeon_device *rdev, struct radeon_fence **fences, bool intr) { uint64_t seq[RADEON_NUM_RINGS]; - unsigned i; + unsigned i, num_rings = 0; int r; for (i = 0; i < RADEON_NUM_RINGS; ++i) { @@ -439,57 +443,99 @@ int radeon_fence_wait_any(struct radeon_device *rdev, continue; } - if (fences[i]->seq == RADEON_FENCE_SIGNALED_SEQ) { - /* something was allready signaled */ - return 0; - } + seq[i] = fences[i]->seq; + ++num_rings; - if (fences[i]->seq < RADEON_FENCE_NOTEMITED_SEQ) { - seq[i] = fences[i]->seq; - } + /* test if something was allready signaled */ + if (seq[i] == RADEON_FENCE_SIGNALED_SEQ) + return 0; } - r = radeon_fence_wait_any_seq(rdev, seq, intr); + /* nothing to wait for ? */ + if (num_rings == 0) + return -ENOENT; + + r = radeon_fence_wait_seq(rdev, seq, intr); if (r) { return r; } return 0; } -int radeon_fence_wait_next_locked(struct radeon_device *rdev, int ring) +/** + * radeon_fence_wait_next - wait for the next fence to signal + * + * @rdev: radeon device pointer + * @ring: ring index the fence is associated with + * + * Wait for the next fence on the requested ring to signal (all asics). + * Returns 0 if the next fence has passed, error for all other cases. + * Caller must hold ring lock. + */ +int radeon_fence_wait_next(struct radeon_device *rdev, int ring) { - uint64_t seq; + uint64_t seq[RADEON_NUM_RINGS] = {}; - /* We are not protected by ring lock when reading current seq but - * it's ok as worst case is we return to early while we could have - * wait. - */ - seq = atomic64_read(&rdev->fence_drv[ring].last_seq) + 1ULL; - if (seq >= rdev->fence_drv[ring].seq) { + seq[ring] = atomic64_read(&rdev->fence_drv[ring].last_seq) + 1ULL; + if (seq[ring] >= rdev->fence_drv[ring].sync_seq[ring]) { /* nothing to wait for, last_seq is already the last emited fence */ return -ENOENT; } - return radeon_fence_wait_seq(rdev, seq, ring, false, false); + return radeon_fence_wait_seq(rdev, seq, false); } -int radeon_fence_wait_empty_locked(struct radeon_device *rdev, int ring) +/** + * radeon_fence_wait_empty - wait for all fences to signal + * + * @rdev: radeon device pointer + * @ring: ring index the fence is associated with + * + * Wait for all fences on the requested ring to signal (all asics). + * Returns 0 if the fences have passed, error for all other cases. + * Caller must hold ring lock. + */ +int radeon_fence_wait_empty(struct radeon_device *rdev, int ring) { - /* We are not protected by ring lock when reading current seq - * but it's ok as wait empty is call from place where no more - * activity can be scheduled so there won't be concurrent access - * to seq value. - */ - return radeon_fence_wait_seq(rdev, rdev->fence_drv[ring].seq, - ring, false, false); + uint64_t seq[RADEON_NUM_RINGS] = {}; + int r; + + seq[ring] = rdev->fence_drv[ring].sync_seq[ring]; + if (!seq[ring]) + return 0; + + r = radeon_fence_wait_seq(rdev, seq, false); + if (r) { + if (r == -EDEADLK) + return -EDEADLK; + + dev_err(rdev->dev, "error waiting for ring[%d] to become idle (%d)\n", + ring, r); + } + return 0; } +/** + * radeon_fence_ref - take a ref on a fence + * + * @fence: radeon fence object + * + * Take a reference on a fence (all asics). + * Returns the fence. + */ struct radeon_fence *radeon_fence_ref(struct radeon_fence *fence) { kref_get(&fence->kref); return fence; } +/** + * radeon_fence_unref - remove a ref on a fence + * + * @fence: radeon fence object + * + * Remove a reference on a fence (all asics). + */ void radeon_fence_unref(struct radeon_fence **fence) { struct radeon_fence *tmp = *fence; @@ -500,6 +546,16 @@ void radeon_fence_unref(struct radeon_fence **fence) } } +/** + * radeon_fence_count_emitted - get the count of emitted fences + * + * @rdev: radeon device pointer + * @ring: ring index the fence is associated with + * + * Get the number of fences emitted on the requested ring (all asics). + * Returns the number of emitted fences on the ring. Used by the + * dynpm code to ring track activity. + */ unsigned radeon_fence_count_emitted(struct radeon_device *rdev, int ring) { uint64_t emitted; @@ -508,7 +564,8 @@ unsigned radeon_fence_count_emitted(struct radeon_device *rdev, int ring) * but it's ok to report slightly wrong fence count here. */ radeon_fence_process(rdev, ring); - emitted = rdev->fence_drv[ring].seq - atomic64_read(&rdev->fence_drv[ring].last_seq); + emitted = rdev->fence_drv[ring].sync_seq[ring] + - atomic64_read(&rdev->fence_drv[ring].last_seq); /* to avoid 32bits warp around */ if (emitted > 0x10000000) { emitted = 0x10000000; @@ -516,15 +573,104 @@ unsigned radeon_fence_count_emitted(struct radeon_device *rdev, int ring) return (unsigned)emitted; } +/** + * radeon_fence_need_sync - do we need a semaphore + * + * @fence: radeon fence object + * @dst_ring: which ring to check against + * + * Check if the fence needs to be synced against another ring + * (all asics). If so, we need to emit a semaphore. + * Returns true if we need to sync with another ring, false if + * not. + */ +bool radeon_fence_need_sync(struct radeon_fence *fence, int dst_ring) +{ + struct radeon_fence_driver *fdrv; + + if (!fence) { + return false; + } + + if (fence->ring == dst_ring) { + return false; + } + + /* we are protected by the ring mutex */ + fdrv = &fence->rdev->fence_drv[dst_ring]; + if (fence->seq <= fdrv->sync_seq[fence->ring]) { + return false; + } + + return true; +} + +/** + * radeon_fence_note_sync - record the sync point + * + * @fence: radeon fence object + * @dst_ring: which ring to check against + * + * Note the sequence number at which point the fence will + * be synced with the requested ring (all asics). + */ +void radeon_fence_note_sync(struct radeon_fence *fence, int dst_ring) +{ + struct radeon_fence_driver *dst, *src; + unsigned i; + + if (!fence) { + return; + } + + if (fence->ring == dst_ring) { + return; + } + + /* we are protected by the ring mutex */ + src = &fence->rdev->fence_drv[fence->ring]; + dst = &fence->rdev->fence_drv[dst_ring]; + for (i = 0; i < RADEON_NUM_RINGS; ++i) { + if (i == dst_ring) { + continue; + } + dst->sync_seq[i] = max(dst->sync_seq[i], src->sync_seq[i]); + } +} + +/** + * radeon_fence_driver_start_ring - make the fence driver + * ready for use on the requested ring. + * + * @rdev: radeon device pointer + * @ring: ring index to start the fence driver on + * + * Make the fence driver ready for processing (all asics). + * Not all asics have all rings, so each asic will only + * start the fence driver on the rings it has. + * Returns 0 for success, errors for failure. + */ int radeon_fence_driver_start_ring(struct radeon_device *rdev, int ring) { uint64_t index; int r; radeon_scratch_free(rdev, rdev->fence_drv[ring].scratch_reg); - if (rdev->wb.use_event) { + if (rdev->wb.use_event || !radeon_ring_supports_scratch_reg(rdev, &rdev->ring[ring])) { rdev->fence_drv[ring].scratch_reg = 0; - index = R600_WB_EVENT_OFFSET + ring * 4; + if (ring != R600_RING_TYPE_UVD_INDEX) { + index = R600_WB_EVENT_OFFSET + ring * 4; + rdev->fence_drv[ring].cpu_addr = &rdev->wb.wb[index/4]; + rdev->fence_drv[ring].gpu_addr = rdev->wb.gpu_addr + + index; + + } else { + /* put fence directly behind firmware */ + index = ALIGN(rdev->uvd_fw->size, 8); + rdev->fence_drv[ring].cpu_addr = rdev->uvd.cpu_addr + index; + rdev->fence_drv[ring].gpu_addr = rdev->uvd.gpu_addr + index; + } + } else { r = radeon_scratch_get(rdev, &rdev->fence_drv[ring].scratch_reg); if (r) { @@ -534,27 +680,51 @@ int radeon_fence_driver_start_ring(struct radeon_device *rdev, int ring) index = RADEON_WB_SCRATCH_OFFSET + rdev->fence_drv[ring].scratch_reg - rdev->scratch.reg_base; + rdev->fence_drv[ring].cpu_addr = &rdev->wb.wb[index/4]; + rdev->fence_drv[ring].gpu_addr = rdev->wb.gpu_addr + index; } - rdev->fence_drv[ring].cpu_addr = &rdev->wb.wb[index/4]; - rdev->fence_drv[ring].gpu_addr = rdev->wb.gpu_addr + index; - radeon_fence_write(rdev, rdev->fence_drv[ring].seq, ring); + radeon_fence_write(rdev, atomic64_read(&rdev->fence_drv[ring].last_seq), ring); rdev->fence_drv[ring].initialized = true; dev_info(rdev->dev, "fence driver on ring %d use gpu addr 0x%016llx and cpu addr 0x%p\n", ring, rdev->fence_drv[ring].gpu_addr, rdev->fence_drv[ring].cpu_addr); return 0; } +/** + * radeon_fence_driver_init_ring - init the fence driver + * for the requested ring. + * + * @rdev: radeon device pointer + * @ring: ring index to start the fence driver on + * + * Init the fence driver for the requested ring (all asics). + * Helper function for radeon_fence_driver_init(). + */ static void radeon_fence_driver_init_ring(struct radeon_device *rdev, int ring) { + int i; + rdev->fence_drv[ring].scratch_reg = -1; rdev->fence_drv[ring].cpu_addr = NULL; rdev->fence_drv[ring].gpu_addr = 0; - rdev->fence_drv[ring].seq = 0; + for (i = 0; i < RADEON_NUM_RINGS; ++i) + rdev->fence_drv[ring].sync_seq[i] = 0; atomic64_set(&rdev->fence_drv[ring].last_seq, 0); - rdev->fence_drv[ring].last_activity = jiffies; rdev->fence_drv[ring].initialized = false; } +/** + * radeon_fence_driver_init - init the fence driver + * for all possible rings. + * + * @rdev: radeon device pointer + * + * Init the fence driver for all possible rings (all asics). + * Not all asics have all rings, so each asic will only + * start the fence driver on the rings it has using + * radeon_fence_driver_start_ring(). + * Returns 0 for success. + */ int radeon_fence_driver_init(struct radeon_device *rdev) { int ring; @@ -569,15 +739,27 @@ int radeon_fence_driver_init(struct radeon_device *rdev) return 0; } +/** + * radeon_fence_driver_fini - tear down the fence driver + * for all possible rings. + * + * @rdev: radeon device pointer + * + * Tear down the fence driver for all possible rings (all asics). + */ void radeon_fence_driver_fini(struct radeon_device *rdev) { - int ring; + int ring, r; mutex_lock(&rdev->ring_lock); for (ring = 0; ring < RADEON_NUM_RINGS; ring++) { if (!rdev->fence_drv[ring].initialized) continue; - radeon_fence_wait_empty_locked(rdev, ring); + r = radeon_fence_wait_empty(rdev, ring); + if (r) { + /* no need to trigger GPU reset as we are unloading */ + radeon_fence_driver_force_completion(rdev); + } wake_up_all(&rdev->fence_queue); radeon_scratch_free(rdev, rdev->fence_drv[ring].scratch_reg); rdev->fence_drv[ring].initialized = false; @@ -585,6 +767,25 @@ void radeon_fence_driver_fini(struct radeon_device *rdev) mutex_unlock(&rdev->ring_lock); } +/** + * radeon_fence_driver_force_completion - force all fence waiter to complete + * + * @rdev: radeon device pointer + * + * In case of GPU reset failure make sure no process keep waiting on fence + * that will never complete. + */ +void radeon_fence_driver_force_completion(struct radeon_device *rdev) +{ + int ring; + + for (ring = 0; ring < RADEON_NUM_RINGS; ring++) { + if (!rdev->fence_drv[ring].initialized) + continue; + radeon_fence_write(rdev, rdev->fence_drv[ring].sync_seq[ring], ring); + } +} + /* * Fence debugfs @@ -595,30 +796,58 @@ 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; - int i; + int i, j; for (i = 0; i < RADEON_NUM_RINGS; ++i) { if (!rdev->fence_drv[i].initialized) continue; + radeon_fence_process(rdev, i); + seq_printf(m, "--- ring %d ---\n", i); seq_printf(m, "Last signaled fence 0x%016llx\n", (unsigned long long)atomic64_read(&rdev->fence_drv[i].last_seq)); - seq_printf(m, "Last emitted 0x%016llx\n", - rdev->fence_drv[i].seq); + seq_printf(m, "Last emitted 0x%016llx\n", + rdev->fence_drv[i].sync_seq[i]); + + for (j = 0; j < RADEON_NUM_RINGS; ++j) { + if (i != j && rdev->fence_drv[j].initialized) + seq_printf(m, "Last sync to ring %d 0x%016llx\n", + j, rdev->fence_drv[i].sync_seq[j]); + } } return 0; } +/** + * radeon_debugfs_gpu_reset - manually trigger a gpu reset + * + * Manually trigger a gpu reset at the next fence wait. + */ +static int radeon_debugfs_gpu_reset(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; + + down_read(&rdev->exclusive_lock); + seq_printf(m, "%d\n", rdev->needs_reset); + rdev->needs_reset = true; + up_read(&rdev->exclusive_lock); + + return 0; +} + static struct drm_info_list radeon_debugfs_fence_list[] = { {"radeon_fence_info", &radeon_debugfs_fence_info, 0, NULL}, + {"radeon_gpu_reset", &radeon_debugfs_gpu_reset, 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); + return radeon_debugfs_add_files(rdev, radeon_debugfs_fence_list, 2); #else return 0; #endif |