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
v5: use atomic for tracking job priorities instead of last_job
v6: rename amdgpu_ring_priority_[get/put]() and align parameters
v7: replace spinlocks with mutexes for KIQ compatibility
v8: raise ring priority during cs_ioctl, instead of job_run
v9: priority_get() before push_job()
Signed-off-by: Andres Rodriguez <andresx7 at gmail.com>
---
drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c | 2 +
drivers/gpu/drm/amd/amdgpu/amdgpu_job.c | 4 ++
drivers/gpu/drm/amd/amdgpu/amdgpu_ring.c | 76 ++++++++++++++++++++++++++-
drivers/gpu/drm/amd/amdgpu/amdgpu_ring.h | 15 ++++++
drivers/gpu/drm/amd/scheduler/gpu_scheduler.h | 7 +++
5 files changed, 103 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c
index b17635c..6eda0f6 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c
@@ -1005,6 +1005,8 @@ static int amdgpu_cs_submit(struct amdgpu_cs_parser *p,
job->uf_sequence = cs->out.handle;
amdgpu_job_free_resources(job);
amdgpu_cs_parser_fini(p, 0, true);
+ amdgpu_ring_priority_get(job->ring,
+ amd_sched_get_job_priority(&job->base));
trace_amdgpu_cs_ioctl(job);
amd_sched_entity_push_job(&job->base);
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_job.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_job.c
index 3d641e1..63b0f3e 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_job.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_job.c
@@ -101,6 +101,7 @@ static void amdgpu_job_free_cb(struct amd_sched_job *s_job)
{
struct amdgpu_job *job = container_of(s_job, struct amdgpu_job, base);
+ amdgpu_ring_priority_put(job->ring, amd_sched_get_job_priority(s_job));
dma_fence_put(job->fence);
amdgpu_sync_free(&job->sync);
amdgpu_sync_free(&job->dep_sync);
@@ -137,6 +138,8 @@ int amdgpu_job_submit(struct amdgpu_job *job, struct amdgpu_ring *ring,
job->fence_ctx = entity->fence_context;
*f = dma_fence_get(&job->base.s_fence->finished);
amdgpu_job_free_resources(job);
+ amdgpu_ring_priority_get(job->ring,
+ amd_sched_get_job_priority(&job->base));
amd_sched_entity_push_job(&job->base);
return 0;
@@ -201,6 +204,7 @@ static struct dma_fence *amdgpu_job_run(struct amd_sched_job *sched_job)
/* 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;
}
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ring.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ring.c
index 75165e0..2d8b20a7 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ring.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ring.c
@@ -155,6 +155,75 @@ void amdgpu_ring_undo(struct amdgpu_ring *ring)
}
/**
+ * amdgpu_ring_priority_put - restore a ring's priority
+ *
+ * @ring: amdgpu_ring structure holding the information
+ * @priority: target priority
+ *
+ * Release a request for executing at @priority
+ */
+void amdgpu_ring_priority_put(struct amdgpu_ring *ring,
+ enum amd_sched_priority priority)
+{
+ int i;
+
+ if (!ring->funcs->set_priority)
+ return;
+
+ if (atomic_dec_return(&ring->num_jobs[priority]) > 0)
+ return;
+
+ /* no need to restore if the job is already at the lowest priority */
+ if (priority == AMD_SCHED_PRIORITY_NORMAL)
+ return;
+
+ mutex_lock(&ring->priority_mutex);
+ /* something higher prio is executing, no need to decay */
+ if (ring->priority > priority)
+ goto out_unlock;
+
+ /* decay priority to the next level with a job available */
+ for (i = priority; i >= AMD_SCHED_PRIORITY_MIN; i--) {
+ if (i == AMD_SCHED_PRIORITY_NORMAL
+ || atomic_read(&ring->num_jobs[i])) {
+ ring->priority = i;
+ ring->funcs->set_priority(ring, i);
+ break;
+ }
+ }
+
+out_unlock:
+ mutex_unlock(&ring->priority_mutex);
+}
+
+/**
+ * amdgpu_ring_priority_get - change the ring's priority
+ *
+ * @ring: amdgpu_ring structure holding the information
+ * @priority: target priority
+ *
+ * Request a ring's priority to be raised to @priority (refcounted).
+ */
+void amdgpu_ring_priority_get(struct amdgpu_ring *ring,
+ enum amd_sched_priority priority)
+{
+ if (!ring->funcs->set_priority)
+ return;
+
+ atomic_inc(&ring->num_jobs[priority]);
+
+ mutex_lock(&ring->priority_mutex);
+ if (priority <= ring->priority)
+ goto out_unlock;
+
+ ring->priority = priority;
+ ring->funcs->set_priority(ring, priority);
+
+out_unlock:
+ mutex_unlock(&ring->priority_mutex);
+}
+
+/**
* amdgpu_ring_init - init driver ring struct.
*
* @adev: amdgpu_device pointer
@@ -169,7 +238,7 @@ int amdgpu_ring_init(struct amdgpu_device *adev, struct amdgpu_ring *ring,
unsigned max_dw, struct amdgpu_irq_src *irq_src,
unsigned irq_type)
{
- int r;
+ int r, i;
if (ring->adev == NULL) {
if (adev->num_rings >= AMDGPU_MAX_RINGS)
@@ -255,9 +324,14 @@ int amdgpu_ring_init(struct amdgpu_device *adev, struct amdgpu_ring *ring,
}
ring->max_dw = max_dw;
+ ring->priority = AMD_SCHED_PRIORITY_NORMAL;
+ mutex_init(&ring->priority_mutex);
INIT_LIST_HEAD(&ring->lru_list);
amdgpu_ring_lru_touch(adev, ring);
+ for (i = 0; i < AMD_SCHED_PRIORITY_MAX; ++i)
+ atomic_set(&ring->num_jobs[i], 0);
+
if (amdgpu_debugfs_ring_init(adev, ring)) {
DRM_ERROR("Failed to register debugfs file for rings !\n");
}
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ring.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_ring.h
index bc8dec9..7348769 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ring.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ring.h
@@ -24,6 +24,7 @@
#ifndef __AMDGPU_RING_H__
#define __AMDGPU_RING_H__
+#include <drm/amdgpu_drm.h>
#include "gpu_scheduler.h"
/* max number of rings */
@@ -56,6 +57,7 @@ struct amdgpu_device;
struct amdgpu_ring;
struct amdgpu_ib;
struct amdgpu_cs_parser;
+struct amdgpu_job;
/*
* Fences.
@@ -147,6 +149,9 @@ struct amdgpu_ring_funcs {
void (*emit_rreg)(struct amdgpu_ring *ring, uint32_t reg);
void (*emit_wreg)(struct amdgpu_ring *ring, uint32_t reg, uint32_t val);
void (*emit_tmz)(struct amdgpu_ring *ring, bool start);
+ /* priority functions */
+ void (*set_priority) (struct amdgpu_ring *ring,
+ enum amd_sched_priority priority);
};
struct amdgpu_ring {
@@ -187,6 +192,12 @@ struct amdgpu_ring {
volatile u32 *cond_exe_cpu_addr;
unsigned vm_inv_eng;
bool has_compute_vm_bug;
+
+ atomic_t num_jobs[AMD_SCHED_PRIORITY_MAX];
+ struct mutex priority_mutex;
+ /* protected by priority_mutex */
+ int priority;
+
#if defined(CONFIG_DEBUG_FS)
struct dentry *ent;
#endif
@@ -197,6 +208,10 @@ 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);
+void amdgpu_ring_priority_get(struct amdgpu_ring *ring,
+ enum amd_sched_priority priority);
+void amdgpu_ring_priority_put(struct amdgpu_ring *ring,
+ enum amd_sched_priority priority);
int amdgpu_ring_init(struct amdgpu_device *adev, struct amdgpu_ring *ring,
unsigned ring_size, struct amdgpu_irq_src *irq_src,
unsigned irq_type);
diff --git a/drivers/gpu/drm/amd/scheduler/gpu_scheduler.h b/drivers/gpu/drm/amd/scheduler/gpu_scheduler.h
index 38e622c..dbcaa2e 100644
--- a/drivers/gpu/drm/amd/scheduler/gpu_scheduler.h
+++ b/drivers/gpu/drm/amd/scheduler/gpu_scheduler.h
@@ -170,4 +170,11 @@ void amd_sched_job_recovery(struct amd_gpu_scheduler *sched);
bool amd_sched_dependency_optimized(struct dma_fence* fence,
struct amd_sched_entity *entity);
void amd_sched_job_kickout(struct amd_sched_job *s_job);
+
+static inline enum amd_sched_priority
+amd_sched_get_job_priority(struct amd_sched_job *job)
+{
+ return (job->s_entity->rq - job->sched->sched_rq);
+}
+
#endif
--
2.9.3
