blob: f522c5f997294ae0aaf70e39f2236ce493176dd1 [file] [log] [blame]
// SPDX-License-Identifier: GPL-2.0 OR MIT
/* Copyright 2017-2019 Qiang Yu <yuq825@gmail.com> */
#include <linux/kthread.h>
#include <linux/slab.h>
#include <linux/xarray.h>
#include "lima_drv.h"
#include "lima_sched.h"
#include "lima_vm.h"
#include "lima_mmu.h"
#include "lima_l2_cache.h"
#include "lima_gem.h"
struct lima_fence {
struct dma_fence base;
struct lima_sched_pipe *pipe;
};
static struct kmem_cache *lima_fence_slab;
static int lima_fence_slab_refcnt;
int lima_sched_slab_init(void)
{
if (!lima_fence_slab) {
lima_fence_slab = kmem_cache_create(
"lima_fence", sizeof(struct lima_fence), 0,
SLAB_HWCACHE_ALIGN, NULL);
if (!lima_fence_slab)
return -ENOMEM;
}
lima_fence_slab_refcnt++;
return 0;
}
void lima_sched_slab_fini(void)
{
if (!--lima_fence_slab_refcnt) {
kmem_cache_destroy(lima_fence_slab);
lima_fence_slab = NULL;
}
}
static inline struct lima_fence *to_lima_fence(struct dma_fence *fence)
{
return container_of(fence, struct lima_fence, base);
}
static const char *lima_fence_get_driver_name(struct dma_fence *fence)
{
return "lima";
}
static const char *lima_fence_get_timeline_name(struct dma_fence *fence)
{
struct lima_fence *f = to_lima_fence(fence);
return f->pipe->base.name;
}
static void lima_fence_release_rcu(struct rcu_head *rcu)
{
struct dma_fence *f = container_of(rcu, struct dma_fence, rcu);
struct lima_fence *fence = to_lima_fence(f);
kmem_cache_free(lima_fence_slab, fence);
}
static void lima_fence_release(struct dma_fence *fence)
{
struct lima_fence *f = to_lima_fence(fence);
call_rcu(&f->base.rcu, lima_fence_release_rcu);
}
static const struct dma_fence_ops lima_fence_ops = {
.get_driver_name = lima_fence_get_driver_name,
.get_timeline_name = lima_fence_get_timeline_name,
.release = lima_fence_release,
};
static struct lima_fence *lima_fence_create(struct lima_sched_pipe *pipe)
{
struct lima_fence *fence;
fence = kmem_cache_zalloc(lima_fence_slab, GFP_KERNEL);
if (!fence)
return NULL;
fence->pipe = pipe;
dma_fence_init(&fence->base, &lima_fence_ops, &pipe->fence_lock,
pipe->fence_context, ++pipe->fence_seqno);
return fence;
}
static inline struct lima_sched_task *to_lima_task(struct drm_sched_job *job)
{
return container_of(job, struct lima_sched_task, base);
}
static inline struct lima_sched_pipe *to_lima_pipe(struct drm_gpu_scheduler *sched)
{
return container_of(sched, struct lima_sched_pipe, base);
}
int lima_sched_task_init(struct lima_sched_task *task,
struct lima_sched_context *context,
struct lima_bo **bos, int num_bos,
struct lima_vm *vm)
{
int err, i;
task->bos = kmemdup(bos, sizeof(*bos) * num_bos, GFP_KERNEL);
if (!task->bos)
return -ENOMEM;
for (i = 0; i < num_bos; i++)
drm_gem_object_get(&bos[i]->base.base);
err = drm_sched_job_init(&task->base, &context->base, vm);
if (err) {
kfree(task->bos);
return err;
}
task->num_bos = num_bos;
task->vm = lima_vm_get(vm);
xa_init_flags(&task->deps, XA_FLAGS_ALLOC);
return 0;
}
void lima_sched_task_fini(struct lima_sched_task *task)
{
struct dma_fence *fence;
unsigned long index;
int i;
drm_sched_job_cleanup(&task->base);
xa_for_each(&task->deps, index, fence) {
dma_fence_put(fence);
}
xa_destroy(&task->deps);
if (task->bos) {
for (i = 0; i < task->num_bos; i++)
drm_gem_object_put_unlocked(&task->bos[i]->base.base);
kfree(task->bos);
}
lima_vm_put(task->vm);
}
int lima_sched_context_init(struct lima_sched_pipe *pipe,
struct lima_sched_context *context,
atomic_t *guilty)
{
struct drm_sched_rq *rq = pipe->base.sched_rq + DRM_SCHED_PRIORITY_NORMAL;
return drm_sched_entity_init(&context->base, &rq, 1, guilty);
}
void lima_sched_context_fini(struct lima_sched_pipe *pipe,
struct lima_sched_context *context)
{
drm_sched_entity_fini(&context->base);
}
struct dma_fence *lima_sched_context_queue_task(struct lima_sched_context *context,
struct lima_sched_task *task)
{
struct dma_fence *fence = dma_fence_get(&task->base.s_fence->finished);
drm_sched_entity_push_job(&task->base, &context->base);
return fence;
}
static struct dma_fence *lima_sched_dependency(struct drm_sched_job *job,
struct drm_sched_entity *entity)
{
struct lima_sched_task *task = to_lima_task(job);
if (!xa_empty(&task->deps))
return xa_erase(&task->deps, task->last_dep++);
return NULL;
}
static struct dma_fence *lima_sched_run_job(struct drm_sched_job *job)
{
struct lima_sched_task *task = to_lima_task(job);
struct lima_sched_pipe *pipe = to_lima_pipe(job->sched);
struct lima_fence *fence;
struct dma_fence *ret;
struct lima_vm *vm = NULL, *last_vm = NULL;
int i;
/* after GPU reset */
if (job->s_fence->finished.error < 0)
return NULL;
fence = lima_fence_create(pipe);
if (!fence)
return NULL;
task->fence = &fence->base;
/* for caller usage of the fence, otherwise irq handler
* may consume the fence before caller use it
*/
ret = dma_fence_get(task->fence);
pipe->current_task = task;
/* this is needed for MMU to work correctly, otherwise GP/PP
* will hang or page fault for unknown reason after running for
* a while.
*
* Need to investigate:
* 1. is it related to TLB
* 2. how much performance will be affected by L2 cache flush
* 3. can we reduce the calling of this function because all
* GP/PP use the same L2 cache on mali400
*
* TODO:
* 1. move this to task fini to save some wait time?
* 2. when GP/PP use different l2 cache, need PP wait GP l2
* cache flush?
*/
for (i = 0; i < pipe->num_l2_cache; i++)
lima_l2_cache_flush(pipe->l2_cache[i]);
if (task->vm != pipe->current_vm) {
vm = lima_vm_get(task->vm);
last_vm = pipe->current_vm;
pipe->current_vm = task->vm;
}
if (pipe->bcast_mmu)
lima_mmu_switch_vm(pipe->bcast_mmu, vm);
else {
for (i = 0; i < pipe->num_mmu; i++)
lima_mmu_switch_vm(pipe->mmu[i], vm);
}
if (last_vm)
lima_vm_put(last_vm);
pipe->error = false;
pipe->task_run(pipe, task);
return task->fence;
}
static void lima_sched_handle_error_task(struct lima_sched_pipe *pipe,
struct lima_sched_task *task)
{
drm_sched_stop(&pipe->base, &task->base);
if (task)
drm_sched_increase_karma(&task->base);
pipe->task_error(pipe);
if (pipe->bcast_mmu)
lima_mmu_page_fault_resume(pipe->bcast_mmu);
else {
int i;
for (i = 0; i < pipe->num_mmu; i++)
lima_mmu_page_fault_resume(pipe->mmu[i]);
}
if (pipe->current_vm)
lima_vm_put(pipe->current_vm);
pipe->current_vm = NULL;
pipe->current_task = NULL;
drm_sched_resubmit_jobs(&pipe->base);
drm_sched_start(&pipe->base, true);
}
static void lima_sched_timedout_job(struct drm_sched_job *job)
{
struct lima_sched_pipe *pipe = to_lima_pipe(job->sched);
struct lima_sched_task *task = to_lima_task(job);
DRM_ERROR("lima job timeout\n");
lima_sched_handle_error_task(pipe, task);
}
static void lima_sched_free_job(struct drm_sched_job *job)
{
struct lima_sched_task *task = to_lima_task(job);
struct lima_sched_pipe *pipe = to_lima_pipe(job->sched);
struct lima_vm *vm = task->vm;
struct lima_bo **bos = task->bos;
int i;
dma_fence_put(task->fence);
for (i = 0; i < task->num_bos; i++)
lima_vm_bo_del(vm, bos[i]);
lima_sched_task_fini(task);
kmem_cache_free(pipe->task_slab, task);
}
static const struct drm_sched_backend_ops lima_sched_ops = {
.dependency = lima_sched_dependency,
.run_job = lima_sched_run_job,
.timedout_job = lima_sched_timedout_job,
.free_job = lima_sched_free_job,
};
static void lima_sched_error_work(struct work_struct *work)
{
struct lima_sched_pipe *pipe =
container_of(work, struct lima_sched_pipe, error_work);
struct lima_sched_task *task = pipe->current_task;
lima_sched_handle_error_task(pipe, task);
}
int lima_sched_pipe_init(struct lima_sched_pipe *pipe, const char *name)
{
unsigned int timeout = lima_sched_timeout_ms > 0 ?
lima_sched_timeout_ms : 500;
pipe->fence_context = dma_fence_context_alloc(1);
spin_lock_init(&pipe->fence_lock);
INIT_WORK(&pipe->error_work, lima_sched_error_work);
return drm_sched_init(&pipe->base, &lima_sched_ops, 1, 0,
msecs_to_jiffies(timeout), name);
}
void lima_sched_pipe_fini(struct lima_sched_pipe *pipe)
{
drm_sched_fini(&pipe->base);
}
void lima_sched_pipe_task_done(struct lima_sched_pipe *pipe)
{
if (pipe->error)
schedule_work(&pipe->error_work);
else {
struct lima_sched_task *task = pipe->current_task;
pipe->task_fini(pipe);
dma_fence_signal(task->fence);
}
}