Commit 954605ca authored by Maarten Lankhorst's avatar Maarten Lankhorst

drm/radeon: use common fence implementation for fences, v4

Changes since v1:
- Kill the sw interrupt dance, add and use
  radeon_irq_kms_sw_irq_get_delayed instead.
- Change custom wait function, lockdep complained about it.
  Holding exclusive_lock in the wait function might cause deadlocks.
  Instead do all the processing in .enable_signaling, and wait
  on the global fence_queue to pick up gpu resets.
- Process all fences in radeon_gpu_reset after reset to close a race
  with the trylock in enable_signaling.
Changes since v2:
- Small changes to work with the rewritten lockup recovery patches.
Changes since v3:
- Call radeon_fence_schedule_check when exclusive_lock cannot be
  acquired to always cause a wake up.
- Reset irqs from hangup check.
- Drop reading seqno in the callback, use cached value.
- Fix indentation in radeon_fence_default_wait
- Add a radeon_test_signaled function, drop a few test_bit calls.
- Make to_radeon_fence global.
Signed-off-by: default avatarMaarten Lankhorst <maarten.lankhorst@canonical.com>
Reviewed-by: default avatarChristian König <christian.koenig@amd.com>
parent 1f0dc9a5
......@@ -66,6 +66,7 @@
#include <linux/kref.h>
#include <linux/interval_tree.h>
#include <linux/hashtable.h>
#include <linux/fence.h>
#include <ttm/ttm_bo_api.h>
#include <ttm/ttm_bo_driver.h>
......@@ -354,17 +355,19 @@ struct radeon_fence_driver {
/* sync_seq is protected by ring emission lock */
uint64_t sync_seq[RADEON_NUM_RINGS];
atomic64_t last_seq;
bool initialized;
bool initialized, delayed_irq;
struct delayed_work lockup_work;
};
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);
......@@ -782,6 +785,7 @@ struct radeon_irq {
int radeon_irq_kms_init(struct radeon_device *rdev);
void radeon_irq_kms_fini(struct radeon_device *rdev);
void radeon_irq_kms_sw_irq_get(struct radeon_device *rdev, int ring);
bool radeon_irq_kms_sw_irq_get_delayed(struct radeon_device *rdev, int ring);
void radeon_irq_kms_sw_irq_put(struct radeon_device *rdev, int ring);
void radeon_irq_kms_pflip_irq_get(struct radeon_device *rdev, int crtc);
void radeon_irq_kms_pflip_irq_put(struct radeon_device *rdev, int crtc);
......@@ -2308,6 +2312,7 @@ 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;
......@@ -2441,7 +2446,17 @@ void cik_mm_wdoorbell(struct radeon_device *rdev, u32 index, u32 v);
/*
* Cast helper
*/
#define to_radeon_fence(p) ((struct radeon_fence *)(p))
extern const struct fence_ops radeon_fence_ops;
static inline struct radeon_fence *to_radeon_fence(struct fence *f)
{
struct radeon_fence *__f = container_of(f, struct radeon_fence, base);
if (__f->base.ops == &radeon_fence_ops)
return __f;
return NULL;
}
/*
* Registers read & write functions.
......
......@@ -1253,6 +1253,7 @@ 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,
......
......@@ -130,21 +130,59 @@ 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)->seq = seq;
(*fence)->ring = ring;
fence_init(&(*fence)->base, &radeon_fence_ops,
&rdev->fence_queue.lock, rdev->fence_context + ring, seq);
radeon_fence_ring_emit(rdev, ring, *fence);
trace_radeon_fence_emit(rdev->ddev, ring, (*fence)->seq);
radeon_fence_schedule_check(rdev, ring);
return 0;
}
/**
* radeon_fence_check_signaled - callback from fence_queue
*
* 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.
*/
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);
/*
* We cannot use radeon_fence_process here because we're already
* in the waitqueue, in a call from wake_up_all.
*/
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;
}
/**
* radeon_fence_activity - check for fence activity
*
......@@ -242,6 +280,15 @@ static void radeon_fence_check_lockup(struct work_struct *work)
return;
}
if (fence_drv->delayed_irq && rdev->ddev->irq_enabled) {
unsigned long irqflags;
fence_drv->delayed_irq = false;
spin_lock_irqsave(&rdev->irq.lock, irqflags);
radeon_irq_set(rdev);
spin_unlock_irqrestore(&rdev->irq.lock, irqflags);
}
if (radeon_fence_activity(rdev, ring))
wake_up_all(&rdev->fence_queue);
......@@ -275,21 +322,6 @@ void radeon_fence_process(struct radeon_device *rdev, int ring)
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);
kfree(fence);
}
/**
* radeon_fence_seq_signaled - check if a fence sequence number has signaled
*
......@@ -318,6 +350,75 @@ static bool radeon_fence_seq_signaled(struct radeon_device *rdev,
return false;
}
static bool radeon_fence_is_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)
return false;
if (down_read_trylock(&rdev->exclusive_lock)) {
radeon_irq_kms_sw_irq_get(rdev, fence->ring);
if (radeon_fence_activity(rdev, fence->ring))
wake_up_all_locked(&rdev->fence_queue);
/* 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);
up_read(&rdev->exclusive_lock);
return false;
}
up_read(&rdev->exclusive_lock);
} else {
/* we're probably in a lockup, lets not fiddle too much */
if (radeon_irq_kms_sw_irq_get_delayed(rdev, fence->ring))
rdev->fence_drv[fence->ring].delayed_irq = true;
radeon_fence_schedule_check(rdev, fence->ring);
}
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);
FENCE_TRACE(&fence->base, "armed on ring %i!\n", fence->ring);
return true;
}
/**
* radeon_fence_signaled - check if a fence has signaled
*
......@@ -330,8 +431,15 @@ bool radeon_fence_signaled(struct radeon_fence *fence)
{
if (!fence)
return true;
if (radeon_fence_seq_signaled(fence->rdev, fence->seq, fence->ring))
if (radeon_fence_seq_signaled(fence->rdev, fence->seq, fence->ring)) {
int ret;
ret = fence_signal(&fence->base);
if (!ret)
FENCE_TRACE(&fence->base, "signaled from radeon_fence_signaled\n");
return true;
}
return false;
}
......@@ -433,17 +541,15 @@ 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;
r = radeon_fence_wait_seq_timeout(fence->rdev, seq, intr, MAX_SCHEDULE_TIMEOUT);
if (r < 0) {
return r;
}
r = fence_signal(&fence->base);
if (!r)
FENCE_TRACE(&fence->base, "signaled from fence_wait\n");
return 0;
}
......@@ -557,7 +663,7 @@ 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;
}
......@@ -574,7 +680,7 @@ void radeon_fence_unref(struct radeon_fence **fence)
*fence = NULL;
if (tmp) {
kref_put(&tmp->kref, radeon_fence_destroy);
fence_put(&tmp->base);
}
}
......@@ -887,3 +993,72 @@ int radeon_debugfs_fence_init(struct radeon_device *rdev)
return 0;
#endif
}
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 inline bool radeon_test_signaled(struct radeon_fence *fence)
{
return test_bit(FENCE_FLAG_SIGNALED_BIT, &fence->base.flags);
}
static signed long radeon_fence_default_wait(struct fence *f, bool intr,
signed long t)
{
struct radeon_fence *fence = to_radeon_fence(f);
struct radeon_device *rdev = fence->rdev;
bool signaled;
fence_enable_sw_signaling(&fence->base);
/*
* This function has to return -EDEADLK, but cannot hold
* exclusive_lock during the wait because some callers
* may already hold it. This means checking needs_reset without
* lock, and not fiddling with any gpu internals.
*
* The callback installed with fence_enable_sw_signaling will
* run before our wait_event_*timeout call, so we will see
* both the signaled fence and the changes to needs_reset.
*/
if (intr)
t = wait_event_interruptible_timeout(rdev->fence_queue,
((signaled = radeon_test_signaled(fence)) ||
rdev->needs_reset), t);
else
t = wait_event_timeout(rdev->fence_queue,
((signaled = radeon_test_signaled(fence)) ||
rdev->needs_reset), t);
if (t > 0 && !signaled)
return -EDEADLK;
return t;
}
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_is_signaled,
.wait = radeon_fence_default_wait,
.release = NULL,
};
......@@ -323,6 +323,21 @@ void radeon_irq_kms_sw_irq_get(struct radeon_device *rdev, int ring)
}
}
/**
* radeon_irq_kms_sw_irq_get_delayed - enable software interrupt
*
* @rdev: radeon device pointer
* @ring: ring whose interrupt you want to enable
*
* Enables the software interrupt for a specific ring (all asics).
* The software interrupt is generally used to signal a fence on
* a particular ring.
*/
bool radeon_irq_kms_sw_irq_get_delayed(struct radeon_device *rdev, int ring)
{
return atomic_inc_return(&rdev->irq.ring_int[ring]) == 1;
}
/**
* radeon_irq_kms_sw_irq_put - disable software interrupt
*
......
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