diff options
Diffstat (limited to 'drivers/gpu/drm/xe/xe_preempt_fence.c')
-rw-r--r-- | drivers/gpu/drm/xe/xe_preempt_fence.c | 157 |
1 files changed, 157 insertions, 0 deletions
diff --git a/drivers/gpu/drm/xe/xe_preempt_fence.c b/drivers/gpu/drm/xe/xe_preempt_fence.c new file mode 100644 index 000000000000..6ab9ff442766 --- /dev/null +++ b/drivers/gpu/drm/xe/xe_preempt_fence.c @@ -0,0 +1,157 @@ +// SPDX-License-Identifier: MIT +/* + * Copyright © 2022 Intel Corporation + */ + +#include <linux/slab.h> + +#include "xe_engine.h" +#include "xe_preempt_fence.h" +#include "xe_vm.h" + +static void preempt_fence_work_func(struct work_struct *w) +{ + bool cookie = dma_fence_begin_signalling(); + struct xe_preempt_fence *pfence = + container_of(w, typeof(*pfence), preempt_work); + struct xe_engine *e = pfence->engine; + + if (pfence->error) + dma_fence_set_error(&pfence->base, pfence->error); + else + e->ops->suspend_wait(e); + + dma_fence_signal(&pfence->base); + dma_fence_end_signalling(cookie); + + queue_work(system_unbound_wq, &e->vm->preempt.rebind_work); + + xe_engine_put(e); +} + +static const char * +preempt_fence_get_driver_name(struct dma_fence *fence) +{ + return "xe"; +} + +static const char * +preempt_fence_get_timeline_name(struct dma_fence *fence) +{ + return "preempt"; +} + +static bool preempt_fence_enable_signaling(struct dma_fence *fence) +{ + struct xe_preempt_fence *pfence = + container_of(fence, typeof(*pfence), base); + struct xe_engine *e = pfence->engine; + + pfence->error = e->ops->suspend(e); + queue_work(system_unbound_wq, &pfence->preempt_work); + return true; +} + +static const struct dma_fence_ops preempt_fence_ops = { + .get_driver_name = preempt_fence_get_driver_name, + .get_timeline_name = preempt_fence_get_timeline_name, + .enable_signaling = preempt_fence_enable_signaling, +}; + +/** + * xe_preempt_fence_alloc() - Allocate a preempt fence with minimal + * initialization + * + * Allocate a preempt fence, and initialize its list head. + * If the preempt_fence allocated has been armed with + * xe_preempt_fence_arm(), it must be freed using dma_fence_put(). If not, + * it must be freed using xe_preempt_fence_free(). + * + * Return: A struct xe_preempt_fence pointer used for calling into + * xe_preempt_fence_arm() or xe_preempt_fence_free(). + * An error pointer on error. + */ +struct xe_preempt_fence *xe_preempt_fence_alloc(void) +{ + struct xe_preempt_fence *pfence; + + pfence = kmalloc(sizeof(*pfence), GFP_KERNEL); + if (!pfence) + return ERR_PTR(-ENOMEM); + + INIT_LIST_HEAD(&pfence->link); + INIT_WORK(&pfence->preempt_work, preempt_fence_work_func); + + return pfence; +} + +/** + * xe_preempt_fence_free() - Free a preempt fence allocated using + * xe_preempt_fence_alloc(). + * @pfence: pointer obtained from xe_preempt_fence_alloc(); + * + * Free a preempt fence that has not yet been armed. + */ +void xe_preempt_fence_free(struct xe_preempt_fence *pfence) +{ + list_del(&pfence->link); + kfree(pfence); +} + +/** + * xe_preempt_fence_arm() - Arm a preempt fence allocated using + * xe_preempt_fence_alloc(). + * @pfence: The struct xe_preempt_fence pointer returned from + * xe_preempt_fence_alloc(). + * @e: The struct xe_engine used for arming. + * @context: The dma-fence context used for arming. + * @seqno: The dma-fence seqno used for arming. + * + * Inserts the preempt fence into @context's timeline, takes @link off any + * list, and registers the struct xe_engine as the xe_engine to be preempted. + * + * Return: A pointer to a struct dma_fence embedded into the preempt fence. + * This function doesn't error. + */ +struct dma_fence * +xe_preempt_fence_arm(struct xe_preempt_fence *pfence, struct xe_engine *e, + u64 context, u32 seqno) +{ + list_del_init(&pfence->link); + pfence->engine = xe_engine_get(e); + dma_fence_init(&pfence->base, &preempt_fence_ops, + &e->compute.lock, context, seqno); + + return &pfence->base; +} + +/** + * xe_preempt_fence_create() - Helper to create and arm a preempt fence. + * @e: The struct xe_engine used for arming. + * @context: The dma-fence context used for arming. + * @seqno: The dma-fence seqno used for arming. + * + * Allocates and inserts the preempt fence into @context's timeline, + * and registers @e as the struct xe_engine to be preempted. + * + * Return: A pointer to the resulting struct dma_fence on success. An error + * pointer on error. In particular if allocation fails it returns + * ERR_PTR(-ENOMEM); + */ +struct dma_fence * +xe_preempt_fence_create(struct xe_engine *e, + u64 context, u32 seqno) +{ + struct xe_preempt_fence *pfence; + + pfence = xe_preempt_fence_alloc(); + if (IS_ERR(pfence)) + return ERR_CAST(pfence); + + return xe_preempt_fence_arm(pfence, e, context, seqno); +} + +bool xe_fence_is_xe_preempt(const struct dma_fence *fence) +{ + return fence->ops == &preempt_fence_ops; +} |