Signed-off-by: Maarten Lankhorst maarten.lankhorst@canonical.com --- diff --git a/drivers/gpu/drm/radeon/radeon.h b/drivers/gpu/drm/radeon/radeon.h index 9f19259..971284e 100644 --- a/drivers/gpu/drm/radeon/radeon.h +++ b/drivers/gpu/drm/radeon/radeon.h @@ -64,6 +64,7 @@ #include <linux/wait.h> #include <linux/list.h> #include <linux/kref.h> +#include <linux/fence.h>
#include <ttm/ttm_bo_api.h> #include <ttm/ttm_bo_driver.h> @@ -114,9 +115,6 @@ extern int radeon_aspm; /* max number of rings */ #define RADEON_NUM_RINGS 6
-/* fence seq are set to this number when signaled */ -#define RADEON_FENCE_SIGNALED_SEQ 0LL - /* internal ring indices */ /* r1xx+ has gfx CP ring */ #define RADEON_RING_TYPE_GFX_INDEX 0 @@ -285,12 +283,15 @@ struct radeon_fence_driver { };
struct radeon_fence { + struct fence base; + struct radeon_device *rdev; - struct kref kref; /* protected by radeon_fence.lock */ uint64_t seq; /* RB, DMA, etc. */ unsigned ring; + + wait_queue_t fence_wake; };
int radeon_fence_driver_start_ring(struct radeon_device *rdev, int ring); @@ -2039,6 +2040,7 @@ struct radeon_device { struct radeon_mman mman; struct radeon_fence_driver fence_drv[RADEON_NUM_RINGS]; wait_queue_head_t fence_queue; + unsigned fence_context; struct mutex ring_lock; struct radeon_ring ring[RADEON_NUM_RINGS]; bool ib_pool_ready; @@ -2117,11 +2119,6 @@ u32 cik_mm_rdoorbell(struct radeon_device *rdev, u32 offset); void cik_mm_wdoorbell(struct radeon_device *rdev, u32 offset, u32 v);
/* - * Cast helper - */ -#define to_radeon_fence(p) ((struct radeon_fence *)(p)) - -/* * Registers read & write functions. */ #define RREG8(reg) readb((rdev->rmmio) + (reg)) diff --git a/drivers/gpu/drm/radeon/radeon_device.c b/drivers/gpu/drm/radeon/radeon_device.c index 63398ae..d76a187 100644 --- a/drivers/gpu/drm/radeon/radeon_device.c +++ b/drivers/gpu/drm/radeon/radeon_device.c @@ -1150,6 +1150,7 @@ int radeon_device_init(struct radeon_device *rdev, for (i = 0; i < RADEON_NUM_RINGS; i++) { rdev->ring[i].idx = i; } + rdev->fence_context = fence_context_alloc(RADEON_NUM_RINGS);
DRM_INFO("initializing kernel modesetting (%s 0x%04X:0x%04X 0x%04X:0x%04X).\n", radeon_family_name[rdev->family], pdev->vendor, pdev->device, diff --git a/drivers/gpu/drm/radeon/radeon_fence.c b/drivers/gpu/drm/radeon/radeon_fence.c index ddb8f8e..92a1576 100644 --- a/drivers/gpu/drm/radeon/radeon_fence.c +++ b/drivers/gpu/drm/radeon/radeon_fence.c @@ -39,6 +39,15 @@ #include "radeon.h" #include "radeon_trace.h"
+static const struct fence_ops radeon_fence_ops; + +#define to_radeon_fence(p) \ + ({ \ + struct radeon_fence *__f; \ + __f = container_of((p), struct radeon_fence, base); \ + __f->base.ops == &radeon_fence_ops ? __f : NULL; \ + }) + /* * Fences * Fences mark an event in the GPUs pipeline and are used @@ -111,14 +120,17 @@ int radeon_fence_emit(struct radeon_device *rdev, struct radeon_fence **fence, int ring) { + u64 seq = ++rdev->fence_drv[ring].sync_seq[ring]; + /* we are protected by the ring emission mutex */ *fence = kmalloc(sizeof(struct radeon_fence), GFP_KERNEL); if ((*fence) == NULL) { return -ENOMEM; } - kref_init(&((*fence)->kref)); + __fence_init(&(*fence)->base, &radeon_fence_ops, + &rdev->fence_queue.lock, rdev->fence_context + ring, seq); (*fence)->rdev = rdev; - (*fence)->seq = ++rdev->fence_drv[ring].sync_seq[ring]; + (*fence)->seq = seq; (*fence)->ring = ring; radeon_fence_ring_emit(rdev, ring, *fence); trace_radeon_fence_emit(rdev->ddev, (*fence)->seq); @@ -126,15 +138,38 @@ int radeon_fence_emit(struct radeon_device *rdev, }
/** - * radeon_fence_process - process a fence + * radeon_fence_check_signaled - callback from fence_queue * - * @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). + * this function is called with fence_queue lock held, which is also used + * for the fence locking itself, so unlocked variants are used for + * fence_signal, and remove_wait_queue. */ -void radeon_fence_process(struct radeon_device *rdev, int ring) +static int radeon_fence_check_signaled(wait_queue_t *wait, unsigned mode, int flags, void *key) +{ + struct radeon_fence *fence; + u64 seq; + + fence = container_of(wait, struct radeon_fence, fence_wake); + + seq = atomic64_read(&fence->rdev->fence_drv[fence->ring].last_seq); + if (seq >= fence->seq) { + int ret = __fence_signal(&fence->base); + + if (!ret) + FENCE_TRACE(&fence->base, "signaled from irq context\n"); + else + FENCE_TRACE(&fence->base, "was already signaled\n"); + + /* probably a bad idea to call this from the irq handler, so lets not.. */ + atomic_dec(&fence->rdev->irq.ring_int[fence->ring]); + __remove_wait_queue(&fence->rdev->fence_queue, &fence->fence_wake); + fence_put(&fence->base); + } else + FENCE_TRACE(&fence->base, "pending\n"); + return 0; +} + +static bool __radeon_fence_process(struct radeon_device *rdev, int ring) { uint64_t seq, last_seq, last_emitted; unsigned count_loop = 0; @@ -190,25 +225,24 @@ void radeon_fence_process(struct radeon_device *rdev, int ring) } } while (atomic64_xchg(&rdev->fence_drv[ring].last_seq, seq) > seq);
- if (wake) { + if (wake) rdev->fence_drv[ring].last_activity = jiffies; - wake_up_all(&rdev->fence_queue); - } + return wake; }
/** - * radeon_fence_destroy - destroy a fence + * radeon_fence_process - process a fence * - * @kref: fence kref + * @rdev: radeon_device pointer + * @ring: ring index the fence is associated with * - * Frees the fence object (all asics). + * Checks the current fence value and wakes the fence queue + * if the sequence number has increased (all asics). */ -static void radeon_fence_destroy(struct kref *kref) +void radeon_fence_process(struct radeon_device *rdev, int ring) { - struct radeon_fence *fence; - - fence = container_of(kref, struct radeon_fence, kref); - kfree(fence); + if (__radeon_fence_process(rdev, ring)) + wake_up_all(&rdev->fence_queue); }
/** @@ -239,6 +273,49 @@ static bool radeon_fence_seq_signaled(struct radeon_device *rdev, return false; }
+static bool __radeon_fence_signaled(struct fence *f) +{ + struct radeon_fence *fence = to_radeon_fence(f); + + return radeon_fence_seq_signaled(fence->rdev, fence->seq, fence->ring); +} + +/** + * radeon_fence_enable_signaling - enable signalling on fence + * @fence: fence + * + * This function is called with fence_queue lock held, and adds a callback + * to fence_queue that checks if this fence is signaled, and if so it + * signals the fence and removes itself. + */ +static bool radeon_fence_enable_signaling(struct fence *f) +{ + struct radeon_fence *fence = to_radeon_fence(f); + + if (atomic64_read(&fence->rdev->fence_drv[fence->ring].last_seq) >= fence->seq || + !fence->rdev->ddev->irq_enabled) + return false; + + radeon_irq_kms_sw_irq_get(fence->rdev, fence->ring); + + if (__radeon_fence_process(fence->rdev, fence->ring)) + wake_up_all_locked(&fence->rdev->fence_queue); + + /* did fence get signaled after we enabled the sw irq? */ + if (atomic64_read(&fence->rdev->fence_drv[fence->ring].last_seq) >= fence->seq) { + radeon_irq_kms_sw_irq_put(fence->rdev, fence->ring); + return false; + } + + fence->fence_wake.flags = 0; + fence->fence_wake.private = NULL; + fence->fence_wake.func = radeon_fence_check_signaled; + __add_wait_queue(&fence->rdev->fence_queue, &fence->fence_wake); + fence_get(f); + + return true; +} + /** * radeon_fence_signaled - check if a fence has signaled * @@ -252,11 +329,13 @@ bool radeon_fence_signaled(struct radeon_fence *fence) if (!fence) { return true; } - if (fence->seq == RADEON_FENCE_SIGNALED_SEQ) { - return true; - } + if (radeon_fence_seq_signaled(fence->rdev, fence->seq, fence->ring)) { - fence->seq = RADEON_FENCE_SIGNALED_SEQ; + int ret; + + ret = fence_signal(&fence->base); + if (!ret) + FENCE_TRACE(&fence->base, "signaled from radeon_fence_signaled\n"); return true; } return false; @@ -379,7 +458,7 @@ static int radeon_fence_wait_seq(struct radeon_device *rdev, u64 target_seq, * radeon_fence_wait - wait for a fence to signal * * @fence: radeon fence object - * @intr: use interruptable sleep + * @intr: use interruptible sleep * * Wait for the requested fence to signal (all asics). * @intr selects whether to use interruptable (true) or non-interruptable @@ -390,17 +469,17 @@ int radeon_fence_wait(struct radeon_fence *fence, bool intr) { int r;
- if (fence == NULL) { - WARN(1, "Querying an invalid fence : %p !\n", fence); - return -EINVAL; - } + if (test_bit(FENCE_FLAG_SIGNALED_BIT, &fence->base.flags)) + return 0;
r = radeon_fence_wait_seq(fence->rdev, fence->seq, fence->ring, intr, true); if (r) { return r; } - fence->seq = RADEON_FENCE_SIGNALED_SEQ; + r = fence_signal(&fence->base); + if (!r) + FENCE_TRACE(&fence->base, "signaled from fence_wait\n"); return 0; }
@@ -567,8 +646,8 @@ int radeon_fence_wait_any(struct radeon_device *rdev, continue; }
- if (fences[i]->seq == RADEON_FENCE_SIGNALED_SEQ) { - /* something was allready signaled */ + if (test_bit(FENCE_FLAG_SIGNALED_BIT, &fences[i]->base.flags)) { + /* already signaled */ return 0; }
@@ -641,7 +720,7 @@ int radeon_fence_wait_empty_locked(struct radeon_device *rdev, int ring) */ struct radeon_fence *radeon_fence_ref(struct radeon_fence *fence) { - kref_get(&fence->kref); + fence_get(&fence->base); return fence; }
@@ -657,9 +736,8 @@ void radeon_fence_unref(struct radeon_fence **fence) struct radeon_fence *tmp = *fence;
*fence = NULL; - if (tmp) { - kref_put(&tmp->kref, radeon_fence_destroy); - } + if (tmp) + fence_put(&tmp->base); }
/** @@ -947,3 +1025,10 @@ int radeon_debugfs_fence_init(struct radeon_device *rdev) return 0; #endif } + +static const struct fence_ops radeon_fence_ops = { + .enable_signaling = radeon_fence_enable_signaling, + .signaled = __radeon_fence_signaled, + .wait = fence_default_wait, + .release = NULL, +};