/*
* Copyright 2009 Jerome Glisse.
* All Rights Reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sub license, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
* THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
* DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
* OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
* USE OR OTHER DEALINGS IN THE SOFTWARE.
*
* The above copyright notice and this permission notice (including the
* next paragraph) shall be included in all copies or substantial portions
* of the Software.
*
*/
/*
* Authors:
* Jerome Glisse <glisse@freedesktop.org>
* Dave Airlie
*/
#include <linux/atomic.h>
#include <linux/firmware.h>
#include <linux/kref.h>
#include <linux/sched/signal.h>
#include <linux/seq_file.h>
#include <linux/slab.h>
#include <linux/wait.h>
#include <drm/drm_debugfs.h>
#include <drm/drm_device.h>
#include <drm/drm_file.h>
#include "radeon.h"
#include "radeon_reg.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)
{
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(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 (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(drv->scratch_reg);
}
return seq;
}
/**
* radeon_fence_schedule_check - schedule lockup check
*
* @rdev: radeon_device pointer
* @ring: ring index we should work with
*
* Queues a delayed work item to check for lockups.
*/
static void radeon_fence_schedule_check(struct radeon_device *rdev, int ring)
{
/*
* Do not reset the timer here with mod_delayed_work,
* this can livelock in an interaction with TTM delayed destroy.
*/
queue_delayed_work(system_power_efficient_wq,
&rdev->fence_drv[ring].lockup_work,
RADEON_FENCE_JIFFIES_TIMEOUT);
}
/**
* 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)
{
u64 seq;
/* we are protected by the ring emission mutex */
*fence = kmalloc(sizeof(struct radeon_fence), GFP_KERNEL);
if ((*fence) == NULL) {
return -ENOMEM;
}
(*fence)->rdev = rdev;
(*fence)->seq = seq = ++rdev->fence_drv[ring].sync_seq[ring];
(*fence)->ring = ring;
(*fence)->is_vm_update = false;
dma_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_entry_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 = dma_fence_signal_locked(&fence->base);
if (!ret)
DMA_FENCE_TRACE(&fence->base, "signaled from irq context\n");
else
DMA_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);
dma_fence_put(&fence->base);
} else
DMA_FENCE_TRACE(&fence->base, "pending\n");
return 0;
}
/**
* radeon_fence_activity - check for fence activity
*
* @rdev: radeon_device pointer
* @ring: ring index the fence is associated with
*
* Checks the current fence value and calculates the last
* signalled fence value. Returns true if activity occured
* on the ring, and the fence_queue should be waken up.
*/
static bool radeon_fence_activity(struct radeon_device *rdev, int ring)
{
uint64_t seq, last_seq, last_emitted;
unsigned count_loop = 0;
bool wake = false;
/* Note there is a scenario here for an infinite loop but it's
* very unlikely to happen. For it to happen, the current polling
* process need to be interrupted by another process and another
* process needs to update the last_seq btw the atomic read and
* xchg of the current process.
*
* More over for this to go in infinite loop there need to be
* continuously new fence signaled ie radeon_fence_read needs
* to return a different value each time for both the currently
* polling process and the other process that xchg the last_seq
* btw atomic read and xchg of the current process. And the
* value the other process set as last seq must be higher than
* the seq value we just read. Which means that current process
* need to be interrupted after radeon_fence_read and before
* atomic xchg.
*
* To be even more safe we count the number of time we loop and
* we bail after 10 loop just accepting the fact that we might
* have temporarly set the last_seq not to the true real last
* seq but to an older one.
*/
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 &= 0xffffffff;
seq |= last_emitted & 0xffffffff00000000LL;
}
if (seq <= last_seq || seq > last_emitted) {
break;
}
/* If we loop over we don't want to return without
* checking if a fence is signaled as it means that the
* seq we just read is different from the previous on.
*/
wake = true;
last_seq = seq;
if ((count_loop++) > 10) {
/* We looped over too many time leave with the
* fact that we might have set an older fence
* seq then the current real last seq as signaled
* by the hw.
*/
break;
}
} while (atomic64_xchg(&rdev->fence_drv[ring].last_seq, seq) > seq);
if (seq < last_emitted)
radeon_fence_schedule_check(rdev, ring);
return wake;
}
/**
* radeon_fence_check_lockup - check for hardware lockup
*
* @work: delayed work item
*
* Checks for fence activity and if there is none probe
* the hardware if a lockup occured.
*/
static void radeon_fence_check_lockup(struct work_struct *work)
{
struct radeon_fence_driver *fence_drv;
struct radeon_device *rdev;
int ring;
fence_drv = container_of(work, struct radeon_fence_driver,
lockup_work.work);
rdev = fence_drv->rdev;
ring = fence_drv - &rdev->fence_drv[0];
if (!down_read_trylock(&rdev->exclusive_lock)) {
/* just reschedule the check if a reset is going on */
radeon_fence_schedule_check(rdev, ring);
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);
else if (radeon_ring_is_lockup(rdev, ring, &rdev->ring[ring])) {
/* good news we believe it's a lockup */
dev_warn(rdev->dev, "GPU lockup (current fence id "
"0x%016llx last fence id 0x%016llx on ring %d)\n",
(uint64_t)atomic64_read(&fence_drv->last_seq),
fence_drv->sync_seq[ring], ring);
/* remember that we need an reset */
rdev->needs_reset = true;
wake_up_all(&rdev->fence_queue);
}
up_read(&rdev->exclusive_lock);
}
/**
* 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)
{
if (radeon_fence_activity(rdev, ring))
wake_up_all(&rdev->fence_queue);
}
/**
* 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)
{
if (atomic64_read(&rdev->fence_drv[ring].last_seq) >= seq) {
return true;
}
/* poll new last sequence at least once */
radeon_fence_process(rdev, ring);
if (atomic64_read(&rdev->fence_drv[ring].last_seq) >= seq) {
return true;
}
return false;
}
static bool radeon_fence_is_signaled(struct dma_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 dma_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);
dma_fence_get(f);
DMA_FENCE_TRACE(&fence->base, "armed on ring %i!\n", fence->ring);
return true;
}
/**
* 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 (radeon_fence_seq_signaled(fence->rdev, fence->seq, fence->ring)) {
int ret;
ret = dma_fence_signal(&fence->base);
if (!ret)
DMA_FENCE_TRACE(&fence->base, "signaled from radeon_fence_signaled\n");
return true;
}
return false;
}
/**
* 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 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_timeout - wait for a specific sequence numbers
*
* @rdev: radeon device pointer
* @target_seq: sequence number(s) we want to wait for
* @intr: use interruptable sleep
* @timeout: maximum time to wait, or MAX_SCHEDULE_TIMEOUT for infinite wait
*
* 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 remaining time if the sequence number has passed, 0 when
* the wait timeout, or an error for all other cases.
* -EDEADLK is returned when a GPU lockup has been detected.
*/
static long radeon_fence_wait_seq_timeout(struct radeon_device *rdev,
u64 *target_seq, bool intr,
long timeout)
{
long r;
int i;
if (radeon_fence_any_seq_signaled(rdev, target_seq))
return timeout;
/* enable IRQs and tracing */
for (i = 0; i < RADEON_NUM_RINGS; ++i) {
if (!target_seq[i])
continue;
trace_radeon_fence_wait_begin(rdev->ddev, i, target_seq[i]);
radeon_irq_kms_sw_irq_get(rdev, i);
}
if (intr) {
r = wait_event_interruptible_timeout(rdev->fence_queue, (
radeon_fence_any_seq_signaled(rdev, target_seq)
|| rdev->needs_reset), timeout);
} else {
r = wait_event_timeout(rdev->fence_queue, (
radeon_fence_any_seq_signaled(rdev, target_seq)
|| rdev->needs_reset), timeout);
}
if (rdev->needs_reset)
r = -EDEADLK;
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]);
}
return r;
}
/**
* radeon_fence_wait_timeout - wait for a fence to signal with timeout
*
* @fence: radeon fence object
* @intr: use interruptible 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.
* @timeout: maximum time to wait, or MAX_SCHEDULE_TIMEOUT for infinite wait
* Returns remaining time if the sequence number has passed, 0 when
* the wait timeout, or an error for all other cases.
*/
long radeon_fence_wait_timeout(struct radeon_fence *fence, bool intr, long timeout)
{
uint64_t seq[RADEON_NUM_RINGS] = {};
long r;
int r_sig;
/*
* This function should not be called on !radeon fences.
* If this is the case, it would mean this function can
* also be called on radeon fences belonging to another card.
* exclusive_lock is not held in that case.
*/
if (WARN_ON_ONCE(!to_radeon_fence(&fence->base)))
return dma_fence_wait(&fence->base, intr);
seq[fence->ring] = fence->seq;
r = radeon_fence_wait_seq_timeout(fence->rdev, seq, intr, timeout);
if (r <= 0) {
return r;
}
r_sig = dma_fence_signal(&fence->base);
if (!r_sig)
DMA_FENCE_TRACE(&fence->base, "signaled from fence_wait\n");
return r;
}
/**
* radeon_fence_wait - wait for a fence to signal
*
* @fence: radeon fence object
* @intr: use interruptible 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)
{
long r = radeon_fence_wait_timeout(fence, intr, MAX_SCHEDULE_TIMEOUT);
if (r > 0) {
return 0;
} else {
return r;
}
}
/**
* 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, num_rings = 0;
long r;
for (i = 0; i < RADEON_NUM_RINGS; ++i) {
seq[i] = 0;
if (!fences[i]) {
continue;
}
seq[i] = fences[i]->seq;
++num_rings;
}
/* nothing to wait for ? */
if (num_rings == 0)
return -ENOENT;
r = radeon_fence_wait_seq_timeout(rdev, seq, intr, MAX_SCHEDULE_TIMEOUT);
if (r < 0) {
return r;
}
return 0;
}
/**
* 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[RADEON_NUM_RINGS] = {};
long r;
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;
}
r = radeon_fence_wait_seq_timeout(rdev, seq, false, MAX_SCHEDULE_TIMEOUT);
if (r < 0)
return r;
return 0;
}
/**
* 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)
{
uint64_t seq[RADEON_NUM_RINGS] = {};
long r;
seq[ring] = rdev->fence_drv[ring].sync_seq[ring];
if (!seq[ring])
return 0;
r = radeon_fence_wait_seq_timeout(rdev, seq, false, MAX_SCHEDULE_TIMEOUT);
if (r < 0) {
if (r == -EDEADLK)
return -EDEADLK;
dev_err(rdev->dev, "error waiting for ring[%d] to become idle (%ld)\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)
{
dma_fence_get(&fence->base);
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;
*fence = NULL;
if (tmp) {
dma_fence_put(&tmp->base);
}
}
/**
* 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;
/* We are not protected by ring lock when reading the last sequence
* but it's ok to report slightly wrong fence count here.
*/
radeon_fence_process(rdev, ring);
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;
}
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 || !radeon_ring_supports_scratch_reg(rdev, &rdev->ring[ring])) {
rdev->fence_drv[ring].scratch_reg = 0;
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) {
dev_err(rdev->dev, "fence failed to get scratch register\n");
return r;
}
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;
}
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;
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].initialized = false;
INIT_DELAYED_WORK(&rdev->fence_drv[ring].lockup_work,
radeon_fence_check_lockup);
rdev->fence_drv[ring].rdev = rdev;
}
/**
* 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;
init_waitqueue_head(&rdev->fence_queue);
for (ring = 0; ring < RADEON_NUM_RINGS; ring++) {
radeon_fence_driver_init_ring(rdev, ring);
}
if (radeon_debugfs_fence_init(rdev)) {
dev_err(rdev->dev, "fence debugfs file creation failed\n");
}
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, r;
mutex_lock(&rdev->ring_lock);
for (ring = 0; ring < RADEON_NUM_RINGS; ring++) {
if (!rdev->fence_drv[ring].initialized)
continue;
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, ring);
}
cancel_delayed_work_sync(&rdev->fence_drv[ring].lockup_work);
wake_up_all(&rdev->fence_queue);
radeon_scratch_free(rdev, rdev->fence_drv[ring].scratch_reg);
rdev->fence_drv[ring].initialized = false;
}
mutex_unlock(&rdev->ring_lock);
}
/**
* radeon_fence_driver_force_completion - force all fence waiter to complete
*
* @rdev: radeon device pointer
* @ring: the ring to complete
*
* 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)
{
if (rdev->fence_drv[ring].initialized) {
radeon_fence_write(rdev, rdev->fence_drv[ring].sync_seq[ring], ring);
cancel_delayed_work_sync(&rdev->fence_drv[ring].lockup_work);
}
}
/*
* Fence debugfs
*/
#if defined([31mCONFIG_DEBUG_FS[0m)
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, 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].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;
wake_up_all(&rdev->fence_queue);
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([31mCONFIG_DEBUG_FS[0m)
return radeon_debugfs_add_files(rdev, radeon_debugfs_fence_list, 2);
#else
return 0;
#endif
}
static const char *radeon_fence_get_driver_name(struct dma_fence *fence)
{
return "radeon";
}
static const char *radeon_fence_get_timeline_name(struct dma_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(DMA_FENCE_FLAG_SIGNALED_BIT, &fence->base.flags);
}
struct radeon_wait_cb {
struct dma_fence_cb base;
struct task_struct *task;
};
static void
radeon_fence_wait_cb(struct dma_fence *fence, struct dma_fence_cb *cb)
{
struct radeon_wait_cb *wait =
container_of(cb, struct radeon_wait_cb, base);
wake_up_process(wait->task);
}
static signed long radeon_fence_default_wait(struct dma_fence *f, bool intr,
signed long t)
{
struct radeon_fence *fence = to_radeon_fence(f);
struct radeon_device *rdev = fence->rdev;
struct radeon_wait_cb cb;
cb.task = current;
if (dma_fence_add_callback(f, &cb.base, radeon_fence_wait_cb))
return t;
while (t > 0) {
if (intr)
set_current_state(TASK_INTERRUPTIBLE);
else
set_current_state(TASK_UNINTERRUPTIBLE);
/*
* radeon_test_signaled must be called after
* set_current_state to prevent a race with wake_up_process
*/
if (radeon_test_signaled(fence))
break;
if (rdev->needs_reset) {
t = -EDEADLK;
break;
}
t = schedule_timeout(t);
if (t > 0 && intr && signal_pending(current))
t = -ERESTARTSYS;
}
__set_current_state(TASK_RUNNING);
dma_fence_remove_callback(f, &cb.base);
return t;
}
const struct dma_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,
};