Am 02.03.2017 um 22:44 schrieb Andres Rodriguez:
Add an initial framework for changing the HW priorities of rings. The
framework allows requesting priority changes for the lifetime of an
amdgpu_job. After the job completes the priority will decay to the next
lowest priority for which a request is still valid.
A new ring function set_priority() can now be populated to take care of
the HW specific programming sequence for priority changes.
v2: set priority before emitting IB, and take a ref on amdgpu_job
v3: use AMD_SCHED_PRIORITY_* instead of AMDGPU_CTX_PRIORITY_*
v4: plug amdgpu_ring_restore_priority_cb into amdgpu_job_free_cb
Signed-off-by: Andres Rodriguez <andre...@gmail.com>
---
drivers/gpu/drm/amd/amdgpu/amdgpu.h | 3 +-
drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c | 2 +-
drivers/gpu/drm/amd/amdgpu/amdgpu_job.c | 14 +++++-
drivers/gpu/drm/amd/amdgpu/amdgpu_ring.c | 73 ++++++++++++++++++++++++++++++++
drivers/gpu/drm/amd/amdgpu/amdgpu_ring.h | 12 ++++++
5 files changed, 100 insertions(+), 4 deletions(-)
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu.h
b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
index bf15373..e7e92fd 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
@@ -636,21 +636,21 @@ struct amdgpu_flip_work {
struct amdgpu_ib {
struct amdgpu_sa_bo *sa_bo;
uint32_t length_dw;
uint64_t gpu_addr;
uint32_t *ptr;
uint32_t flags;
};
extern const struct amd_sched_backend_ops amdgpu_sched_ops;
-int amdgpu_job_alloc(struct amdgpu_device *adev, unsigned num_ibs,
+int amdgpu_job_alloc(struct amdgpu_device *adev, unsigned num_ibs, int
priority,
struct amdgpu_job **job, struct amdgpu_vm *vm);
int amdgpu_job_alloc_with_ib(struct amdgpu_device *adev, unsigned size,
struct amdgpu_job **job);
void amdgpu_job_free_resources(struct amdgpu_job *job);
void amdgpu_job_free(struct amdgpu_job *job);
int amdgpu_job_submit(struct amdgpu_job *job, struct amdgpu_ring *ring,
struct amd_sched_entity *entity, void *owner,
struct dma_fence **f);
@@ -981,20 +981,21 @@ struct amdgpu_cs_parser {
#define AMDGPU_VM_DOMAIN (1 << 3) /* bit set means in
virtual memory context */
struct amdgpu_job {
struct amd_sched_job base;
struct amdgpu_device *adev;
struct amdgpu_vm *vm;
struct amdgpu_ring *ring;
struct amdgpu_sync sync;
struct amdgpu_ib *ibs;
struct dma_fence *fence; /* the hw fence */
+ int priority;
Actually that is unnecessary (and thinking more about it the priority in
the context is unnecessary as well).
(job->base.sched->sched_rq - job->base.s_entity->rq) should give you the
scheduler priority of the job as well.
We can add an inline helper in the scheduler for that.
Additional to that please use enum amd_sched_priority instead of int for
the priority all over the patch.
uint32_t preamble_status;
uint32_t num_ibs;
void *owner;
uint64_t fence_ctx; /* the fence_context this job uses */
bool vm_needs_flush;
unsigned vm_id;
uint64_t vm_pd_addr;
uint32_t gds_base, gds_size;
uint32_t gws_base, gws_size;
uint32_t oa_base, oa_size;
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c
b/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c
index 605d40e..19ce202 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c
@@ -179,21 +179,21 @@ int amdgpu_cs_parser_init(struct amdgpu_cs_parser *p,
void *data)
case AMDGPU_CHUNK_ID_DEPENDENCIES:
break;
default:
ret = -EINVAL;
goto free_partial_kdata;
}
}
- ret = amdgpu_job_alloc(p->adev, num_ibs, &p->job, vm);
+ ret = amdgpu_job_alloc(p->adev, num_ibs, p->ctx->priority, &p->job, vm);
if (ret)
goto free_all_kdata;
if (p->uf_entry.robj)
p->job->uf_addr = uf_offset;
kfree(chunk_array);
return 0;
free_all_kdata:
i = p->nchunks - 1;
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_job.c
b/drivers/gpu/drm/amd/amdgpu/amdgpu_job.c
index 86a1242..28f8a50 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_job.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_job.c
@@ -32,50 +32,51 @@ static void amdgpu_job_timedout(struct amd_sched_job *s_job)
{
struct amdgpu_job *job = container_of(s_job, struct amdgpu_job, base);
DRM_ERROR("ring %s timeout, last signaled seq=%u, last emitted seq=%u\n",
job->base.sched->name,
atomic_read(&job->ring->fence_drv.last_seq),
job->ring->fence_drv.sync_seq);
amdgpu_gpu_reset(job->adev);
}
-int amdgpu_job_alloc(struct amdgpu_device *adev, unsigned num_ibs,
+int amdgpu_job_alloc(struct amdgpu_device *adev, unsigned num_ibs, int
priority,
struct amdgpu_job **job, struct amdgpu_vm *vm)
{
size_t size = sizeof(struct amdgpu_job);
if (num_ibs == 0)
return -EINVAL;
size += sizeof(struct amdgpu_ib) * num_ibs;
*job = kzalloc(size, GFP_KERNEL);
if (!*job)
return -ENOMEM;
(*job)->adev = adev;
(*job)->vm = vm;
+ (*job)->priority = priority;
(*job)->ibs = (void *)&(*job)[1];
(*job)->num_ibs = num_ibs;
amdgpu_sync_create(&(*job)->sync);
return 0;
}
int amdgpu_job_alloc_with_ib(struct amdgpu_device *adev, unsigned size,
struct amdgpu_job **job)
{
int r;
- r = amdgpu_job_alloc(adev, 1, job, NULL);
+ r = amdgpu_job_alloc(adev, 1, AMD_SCHED_PRIORITY_NORMAL, job, NULL);
if (r)
return r;
r = amdgpu_ib_get(adev, NULL, size, &(*job)->ibs[0]);
if (r)
kfree(*job);
return r;
}
@@ -88,20 +89,24 @@ void amdgpu_job_free_resources(struct amdgpu_job *job)
f = job->base.s_fence ? &job->base.s_fence->finished : job->fence;
for (i = 0; i < job->num_ibs; ++i)
amdgpu_ib_free(job->adev, &job->ibs[i], f);
}
static void amdgpu_job_free_cb(struct amd_sched_job *s_job)
{
struct amdgpu_job *job = container_of(s_job, struct amdgpu_job, base);
+ /* no need to restore if we are already at the lowest priority */
+ if (job->priority < AMD_SCHED_PRIORITY_NORMAL)
+ amdgpu_ring_restore_priority_cb(job);
Please put that check into amdgpu_ring_restore_priority_cb(). And by the
way remove the _cb postfix from amdgpu_ring_restore_priority_cb().
+
dma_fence_put(job->fence);
amdgpu_sync_free(&job->sync);
kfree(job);
}
void amdgpu_job_free(struct amdgpu_job *job)
{
amdgpu_job_free_resources(job);
dma_fence_put(job->fence);
@@ -162,28 +167,33 @@ static struct dma_fence *amdgpu_job_run(struct
amd_sched_job *sched_job)
int r;
if (!sched_job) {
DRM_ERROR("job is null\n");
return NULL;
}
job = to_amdgpu_job(sched_job);
BUG_ON(amdgpu_sync_peek_fence(&job->sync, NULL));
+ r = amdgpu_ring_elevate_priority(job->ring, job->priority, job);
+ if (r)
+ DRM_ERROR("Failed to set job priority (%d)\n", r);
+
trace_amdgpu_sched_run_job(job);
r = amdgpu_ib_schedule(job->ring, job->num_ibs, job->ibs, job, &fence);
if (r)
DRM_ERROR("Error scheduling IBs (%d)\n", r);
/* if gpu reset, hw fence will be replaced here */
dma_fence_put(job->fence);
job->fence = dma_fence_get(fence);
+
amdgpu_job_free_resources(job);
return fence;
}
const struct amd_sched_backend_ops amdgpu_sched_ops = {
.dependency = amdgpu_job_dependency,
.run_job = amdgpu_job_run,
.timedout_job = amdgpu_job_timedout,
.free_job = amdgpu_job_free_cb
};
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ring.c
b/drivers/gpu/drm/amd/amdgpu/amdgpu_ring.c
index 31c6274..fa6e72f2 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ring.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ring.c
@@ -193,20 +193,91 @@ void amdgpu_ring_commit(struct amdgpu_ring *ring)
*/
void amdgpu_ring_undo(struct amdgpu_ring *ring)
{
ring->wptr = ring->wptr_old;
if (ring->funcs->end_use)
ring->funcs->end_use(ring);
}
/**
+ * amdgpu_ring_restore_priority_cb - restore a ring's priority
+ *
+ * @job: job which completed execution
+ *
+ * If necessary, restore a ring's priority after a job finishes executing
+ */
+void amdgpu_ring_restore_priority_cb(struct amdgpu_job *job)
+{
+ int i;
+ struct amdgpu_ring *ring = job->ring;
+
+ spin_lock(&ring->priority_lock);
+
+ /* remove ourselves from the list if necessary */
+ if (job == ring->last_job[job->priority])
+ ring->last_job[job->priority] = NULL;
+
+ /* something higher prio is executing, no need to decay */
+ if (ring->priority < job->priority)
+ goto out_unlock;
+
+ /* decay priority to the next level with a job available */
+ for (i = job->priority; i < AMD_SCHED_MAX_PRIORITY; i++) {
+ if (i == AMD_SCHED_PRIORITY_NORMAL || ring->last_job[i]) {
+ ring->priority = i;
+ if (ring->funcs->set_priority)
+ ring->funcs->set_priority(ring, i);
+
+ break;
+ }
+ }
+
+out_unlock:
+ spin_unlock(&ring->priority_lock);
+}
If you use an atomic to count the number of jobs for each priority
running you would only need the spinlock for updating the priority.
Additional to that I would abort early if ring->funcs->set_priority
isn't available (e.g. before doing anything else).
Regards,
Christian.
+
+/**
+ * amdgpu_ring_elevate_priority - change the ring's priority
+ *
+ * @ring: amdgpu_ring structure holding the information
+ * @priority: target priority
+ * @job: priority should remain elevated for the duration of this job
+ *
+ * Use HW specific mechanism's to elevate the ring's priority while @job
+ * is executing. Once @job finishes executing, the ring will reset back
+ * to normal priority.
+ * Returns 0 on success, error otherwise
+ */
+int amdgpu_ring_elevate_priority(struct amdgpu_ring *ring, int priority,
+ struct amdgpu_job *job)
+{
+ if (priority < 0 || priority >= AMD_SCHED_MAX_PRIORITY)
+ return -EINVAL;
+
+ spin_lock(&ring->priority_lock);
+ ring->last_job[priority] = job;
+
+ /* lower number means higher priority */
+ if (priority >= ring->priority)
+ goto out_unlock;
+
+ ring->priority = priority;
+ if (ring->funcs->set_priority)
+ ring->funcs->set_priority(ring, priority);
+
+out_unlock:
+ spin_unlock(&ring->priority_lock);
+ return 0;
+}
+
+/**
* amdgpu_ring_init - init driver ring struct.
*
* @adev: amdgpu_device pointer
* @ring: amdgpu_ring structure holding ring information
* @max_ndw: maximum number of dw for ring alloc
* @nop: nop packet for this ring
*
* Initialize the driver information for the selected ring (all asics).
* Returns 0 on success, error on failure.
*/
@@ -274,20 +345,22 @@ int amdgpu_ring_init(struct amdgpu_device *adev, struct
amdgpu_ring *ring,
&ring->gpu_addr,
(void **)&ring->ring);
if (r) {
dev_err(adev->dev, "(%d) ring create failed\n", r);
return r;
}
memset((void *)ring->ring, 0, ring->ring_size);
}
ring->ptr_mask = (ring->ring_size / 4) - 1;
ring->max_dw = max_dw;
+ ring->priority = AMD_SCHED_PRIORITY_NORMAL;
+ spin_lock_init(&ring->priority_lock);
INIT_LIST_HEAD(&ring->lru_list);
amdgpu_ring_lru_touch(adev, ring);
if (amdgpu_debugfs_ring_init(adev, ring)) {
DRM_ERROR("Failed to register debugfs file for rings !\n");
}
return 0;
}
/**
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ring.h
b/drivers/gpu/drm/amd/amdgpu/amdgpu_ring.h
index b51bdcd..ee6be0c 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ring.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ring.h
@@ -17,20 +17,21 @@
* THE COPYRIGHT HOLDER(S) OR AUTHOR(S) 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.
*
* Authors: Christian König
*/
#ifndef __AMDGPU_RING_H__
#define __AMDGPU_RING_H__
+#include <drm/amdgpu_drm.h>
#include "gpu_scheduler.h"
/* max number of rings */
#define AMDGPU_MAX_RINGS 16
#define AMDGPU_MAX_GFX_RINGS 1
#define AMDGPU_MAX_COMPUTE_RINGS 8
#define AMDGPU_MAX_VCE_RINGS 3
/* some special values for the owner field */
#define AMDGPU_FENCE_OWNER_UNDEFINED ((void*)0ul)
@@ -130,20 +131,22 @@ struct amdgpu_ring_funcs {
void (*pad_ib)(struct amdgpu_ring *ring, struct amdgpu_ib *ib);
unsigned (*init_cond_exec)(struct amdgpu_ring *ring);
void (*patch_cond_exec)(struct amdgpu_ring *ring, unsigned offset);
/* note usage for clock and power gating */
void (*begin_use)(struct amdgpu_ring *ring);
void (*end_use)(struct amdgpu_ring *ring);
void (*emit_switch_buffer) (struct amdgpu_ring *ring);
void (*emit_cntxcntl) (struct amdgpu_ring *ring, uint32_t flags);
void (*emit_rreg)(struct amdgpu_ring *ring, uint32_t reg);
void (*emit_wreg)(struct amdgpu_ring *ring, uint32_t reg, uint32_t val);
+ /* priority functions */
+ void (*set_priority) (struct amdgpu_ring *ring, int priority);
};
struct amdgpu_ring {
struct amdgpu_device *adev;
const struct amdgpu_ring_funcs *funcs;
struct amdgpu_fence_driver fence_drv;
struct amd_gpu_scheduler sched;
struct list_head lru_list;
struct amdgpu_bo *ring_obj;
@@ -164,31 +167,40 @@ struct amdgpu_ring {
struct amdgpu_bo *mqd_obj;
u32 doorbell_index;
bool use_doorbell;
unsigned wptr_offs;
unsigned fence_offs;
uint64_t current_ctx;
char name[16];
unsigned cond_exe_offs;
u64 cond_exe_gpu_addr;
volatile u32 *cond_exe_cpu_addr;
+
+ spinlock_t priority_lock;
+ /* protected by priority_lock */
+ struct amdgpu_job *last_job[AMD_SCHED_MAX_PRIORITY];
+ int priority;
+
#if defined(CONFIG_DEBUG_FS)
struct dentry *ent;
#endif
};
int amdgpu_ring_is_valid_index(struct amdgpu_device *adev,
int hw_ip, int ring);
int amdgpu_ring_alloc(struct amdgpu_ring *ring, unsigned ndw);
void amdgpu_ring_insert_nop(struct amdgpu_ring *ring, uint32_t count);
void amdgpu_ring_generic_pad_ib(struct amdgpu_ring *ring, struct amdgpu_ib
*ib);
void amdgpu_ring_commit(struct amdgpu_ring *ring);
void amdgpu_ring_undo(struct amdgpu_ring *ring);
+int amdgpu_ring_elevate_priority(struct amdgpu_ring *ring, int priority,
+ struct amdgpu_job *job);
+void amdgpu_ring_restore_priority_cb(struct amdgpu_job *job);
int amdgpu_ring_init(struct amdgpu_device *adev, struct amdgpu_ring *ring,
unsigned ring_size, struct amdgpu_irq_src *irq_src,
unsigned irq_type);
void amdgpu_ring_fini(struct amdgpu_ring *ring);
int amdgpu_ring_lru_get(struct amdgpu_device *adev, int hw_ip,
struct amdgpu_ring **ring);
void amdgpu_ring_lru_touch(struct amdgpu_device *adev, struct amdgpu_ring
*ring);
#endif
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