[PATCH v2 09/17] drm/radeon: use common fence implementation for fences

From: Maarten Lankhorst
Date: Wed Jul 09 2014 - 09:24:00 EST

op 09-07-14 14:57, Deucher, Alexander schreef:
>> <snip>
>> +static const char *radeon_fence_get_timeline_name(struct fence *f)
>> +{
>> + struct radeon_fence *fence = to_radeon_fence(f);
>> + switch (fence->ring) {
>> + case RADEON_RING_TYPE_GFX_INDEX: return "radeon.gfx";
>> + case CAYMAN_RING_TYPE_CP1_INDEX: return "radeon.cp1";
>> + case CAYMAN_RING_TYPE_CP2_INDEX: return "radeon.cp2";
>> + case R600_RING_TYPE_DMA_INDEX: return "radeon.dma";
>> + case CAYMAN_RING_TYPE_DMA1_INDEX: return "radeon.dma1";
>> + case R600_RING_TYPE_UVD_INDEX: return "radeon.uvd";
> Radeon supports vce rings on newer ascis. Probably want to add the case for those here too.
>
> Alex
>
Indeed, how about this?
----------8<-------
Signed-off-by: Maarten Lankhorst <maarten.lankhorst@xxxxxxxxxxxxx>
---
drivers/gpu/drm/radeon/radeon.h | 15 +--
drivers/gpu/drm/radeon/radeon_device.c | 60 ++++++++-
drivers/gpu/drm/radeon/radeon_fence.c | 225 +++++++++++++++++++++++++++------
3 files changed, 250 insertions(+), 50 deletions(-)

diff --git a/drivers/gpu/drm/radeon/radeon.h b/drivers/gpu/drm/radeon/radeon.h
index 29d9cc04c04e..03a5567f2c2f 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>
@@ -116,9 +117,6 @@ extern int radeon_deep_color;
#define RADEONFB_CONN_LIMIT 4
#define RADEON_BIOS_NUM_SCRATCH 8

-/* 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
@@ -350,12 +348,15 @@ 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);
@@ -2268,6 +2269,7 @@ 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;
@@ -2358,11 +2360,6 @@ u32 cik_mm_rdoorbell(struct radeon_device *rdev, u32 index);
void cik_mm_wdoorbell(struct radeon_device *rdev, u32 index, 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 03686fab842d..86699df7c8f3 100644
--- a/drivers/gpu/drm/radeon/radeon_device.c
+++ b/drivers/gpu/drm/radeon/radeon_device.c
@@ -1213,6 +1213,7 @@ 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,
@@ -1607,6 +1608,54 @@ int radeon_resume_kms(struct drm_device *dev, bool resume, bool fbcon)
return 0;
}

+static uint32_t radeon_gpu_mask_sw_irq(struct radeon_device *rdev)
+{
+ uint32_t mask = 0;
+ int i;
+
+ if (!rdev->ddev->irq_enabled)
+ return mask;
+
+ /*
+ * increase refcount on sw interrupts for all rings to stop
+ * enabling interrupts in radeon_fence_enable_signaling during
+ * gpu reset.
+ */
+
+ for (i = 0; i < RADEON_NUM_RINGS; ++i) {
+ if (!rdev->ring[i].ready)
+ continue;
+
+ atomic_inc(&rdev->irq.ring_int[i]);
+ mask |= 1 << i;
+ }
+ return mask;
+}
+
+static void radeon_gpu_unmask_sw_irq(struct radeon_device *rdev, uint32_t mask)
+{
+ unsigned long irqflags;
+ int i;
+
+ if (!mask)
+ return;
+
+ /*
+ * undo refcount increase, and reset irqs to correct value.
+ */
+
+ for (i = 0; i < RADEON_NUM_RINGS; ++i) {
+ if (!(mask & (1 << i)))
+ continue;
+
+ atomic_dec(&rdev->irq.ring_int[i]);
+ }
+
+ spin_lock_irqsave(&rdev->irq.lock, irqflags);
+ radeon_irq_set(rdev);
+ spin_unlock_irqrestore(&rdev->irq.lock, irqflags);
+}
+
/**
* radeon_gpu_reset - reset the asic
*
@@ -1624,6 +1673,7 @@ int radeon_gpu_reset(struct radeon_device *rdev)

int i, r;
int resched;
+ uint32_t sw_mask;

down_write(&rdev->exclusive_lock);

@@ -1637,6 +1687,7 @@ int radeon_gpu_reset(struct radeon_device *rdev)
radeon_save_bios_scratch_regs(rdev);
/* block TTM */
resched = ttm_bo_lock_delayed_workqueue(&rdev->mman.bdev);
+ sw_mask = radeon_gpu_mask_sw_irq(rdev);
radeon_pm_suspend(rdev);
radeon_suspend(rdev);

@@ -1686,13 +1737,20 @@ retry:
radeon_pm_resume(rdev);
drm_helper_resume_force_mode(rdev->ddev);

+ radeon_gpu_unmask_sw_irq(rdev, sw_mask);
ttm_bo_unlock_delayed_workqueue(&rdev->mman.bdev, resched);
if (r) {
/* bad news, how to tell it to userspace ? */
dev_info(rdev->dev, "GPU reset failed\n");
}

- up_write(&rdev->exclusive_lock);
+ /*
+ * force all waiters to recheck, some may have been
+ * added while the exclusive_lock was unavailable
+ */
+ downgrade_write(&rdev->exclusive_lock);
+ wake_up_all(&rdev->fence_queue);
+ up_read(&rdev->exclusive_lock);
return r;
}

diff --git a/drivers/gpu/drm/radeon/radeon_fence.c b/drivers/gpu/drm/radeon/radeon_fence.c
index 6435719fd45b..763b7928026d 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
@@ -111,30 +120,55 @@ 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)->rdev = rdev;
- (*fence)->seq = ++rdev->fence_drv[ring].sync_seq[ring];
(*fence)->ring = ring;
+ fence_init(&(*fence)->base, &radeon_fence_ops,
+ &rdev->fence_queue.lock, rdev->fence_context + ring, seq);
+ (*fence)->rdev = rdev;
+ (*fence)->seq = seq;
radeon_fence_ring_emit(rdev, ring, *fence);
trace_radeon_fence_emit(rdev->ddev, ring, (*fence)->seq);
return 0;
}

/**
- * 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_locked(&fence->base);
+
+ if (!ret)
+ FENCE_TRACE(&fence->base, "signaled from irq context\n");
+ else
+ FENCE_TRACE(&fence->base, "was already signaled\n");
+
+ radeon_irq_kms_sw_irq_put(fence->rdev, 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;
@@ -190,23 +224,22 @@ void radeon_fence_process(struct radeon_device *rdev, int ring)
}
} while (atomic64_xchg(&rdev->fence_drv[ring].last_seq, seq) > seq);

- if (wake)
- 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);
}

/**
@@ -237,6 +270,69 @@ 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);
+ struct radeon_device *rdev = fence->rdev;
+ unsigned ring = fence->ring;
+ u64 seq = fence->seq;
+
+ if (atomic64_read(&rdev->fence_drv[ring].last_seq) >= seq) {
+ return true;
+ }
+
+ if (down_read_trylock(&rdev->exclusive_lock)) {
+ radeon_fence_process(rdev, ring);
+ up_read(&rdev->exclusive_lock);
+
+ if (atomic64_read(&rdev->fence_drv[ring].last_seq) >= seq) {
+ return true;
+ }
+ }
+ return false;
+}
+
+/**
+ * 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);
+ struct radeon_device *rdev = fence->rdev;
+
+ if (atomic64_read(&rdev->fence_drv[fence->ring].last_seq) >= fence->seq ||
+ !rdev->ddev->irq_enabled)
+ return false;
+
+ radeon_irq_kms_sw_irq_get(rdev, fence->ring);
+
+ if (down_read_trylock(&rdev->exclusive_lock)) {
+ if (__radeon_fence_process(rdev, fence->ring))
+ wake_up_all_locked(&rdev->fence_queue);
+
+ up_read(&rdev->exclusive_lock);
+ }
+
+ /* did fence get signaled after we enabled the sw irq? */
+ if (atomic64_read(&rdev->fence_drv[fence->ring].last_seq) >= fence->seq) {
+ radeon_irq_kms_sw_irq_put(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(&rdev->fence_queue, &fence->fence_wake);
+ fence_get(f);
+
+ return true;
+}
+
/**
* radeon_fence_signaled - check if a fence has signaled
*
@@ -250,11 +346,13 @@ 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;
@@ -413,21 +511,18 @@ int radeon_fence_wait(struct radeon_fence *fence, bool intr)
uint64_t seq[RADEON_NUM_RINGS] = {};
long r;

- if (fence == NULL) {
- WARN(1, "Querying an invalid fence : %p !\n", fence);
- return -EINVAL;
- }
-
- seq[fence->ring] = fence->seq;
- if (seq[fence->ring] == RADEON_FENCE_SIGNALED_SEQ)
+ if (test_bit(FENCE_FLAG_SIGNALED_BIT, &fence->base.flags))
return 0;

+ seq[fence->ring] = fence->seq;
r = radeon_fence_wait_seq_timeout(fence->rdev, seq, intr, MAX_SCHEDULE_TIMEOUT);
if (r < 0) {
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;
}

@@ -459,12 +554,13 @@ int radeon_fence_wait_any(struct radeon_device *rdev,
continue;
}

+ if (test_bit(FENCE_FLAG_SIGNALED_BIT, &fences[i]->base.flags)) {
+ /* already signaled */
+ return 0;
+ }
+
seq[i] = fences[i]->seq;
++num_rings;
-
- /* test if something was allready signaled */
- if (seq[i] == RADEON_FENCE_SIGNALED_SEQ)
- return 0;
}

/* nothing to wait for ? */
@@ -545,7 +641,7 @@ int radeon_fence_wait_empty(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;
}

@@ -561,9 +657,8 @@ 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);
}

/**
@@ -872,3 +967,53 @@ int radeon_debugfs_fence_init(struct radeon_device *rdev)
return 0;
#endif
}
+
+static long __radeon_fence_wait(struct fence *f, bool intr, long timeout)
+{
+ struct radeon_fence *fence = to_radeon_fence(f);
+ u64 target_seq[RADEON_NUM_RINGS] = {};
+ struct radeon_device *rdev = fence->rdev;
+ long r;
+
+ target_seq[fence->ring] = fence->seq;
+
+ down_read(&rdev->exclusive_lock);
+ r = radeon_fence_wait_seq_timeout(fence->rdev, target_seq, intr, timeout);
+
+ if (r > 0 && !fence_signal(&fence->base))
+ FENCE_TRACE(&fence->base, "signaled from __radeon_fence_wait\n");
+
+ up_read(&rdev->exclusive_lock);
+ return r;
+
+}
+
+static const char *radeon_fence_get_driver_name(struct fence *fence)
+{
+ return "radeon";
+}
+
+static const char *radeon_fence_get_timeline_name(struct fence *f)
+{
+ struct radeon_fence *fence = to_radeon_fence(f);
+ switch (fence->ring) {
+ case RADEON_RING_TYPE_GFX_INDEX: return "radeon.gfx";
+ case CAYMAN_RING_TYPE_CP1_INDEX: return "radeon.cp1";
+ case CAYMAN_RING_TYPE_CP2_INDEX: return "radeon.cp2";
+ case R600_RING_TYPE_DMA_INDEX: return "radeon.dma";
+ case CAYMAN_RING_TYPE_DMA1_INDEX: return "radeon.dma1";
+ case R600_RING_TYPE_UVD_INDEX: return "radeon.uvd";
+ case TN_RING_TYPE_VCE1_INDEX: return "radeon.vce1";
+ case TN_RING_TYPE_VCE2_INDEX: return "radeon.vce2";
+ default: WARN_ON_ONCE(1); return "radeon.unk";
+ }
+}
+
+static const struct fence_ops radeon_fence_ops = {
+ .get_driver_name = radeon_fence_get_driver_name,
+ .get_timeline_name = radeon_fence_get_timeline_name,
+ .enable_signaling = radeon_fence_enable_signaling,
+ .signaled = __radeon_fence_signaled,
+ .wait = __radeon_fence_wait,
+ .release = NULL,
+};
--
2.0.0


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