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drm/i915: Allow i915_sw_fence_await_sw_fence() to allocate 

In forthcoming patches, we want to be able to dynamically allocate the
wait_queue_t used whilst awaiting. This is more convenient if we extend
the i915_sw_fence_await_sw_fence() to perform the allocation for us if
we pass in a gfp mask as an alternative than a preallocated struct.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20161028125858.23563-2-chris@chris-wilson.co.uk
This commit is contained in:
Chris Wilson 2016-10-28 13:58:25 +01:00
parent b52992c06c
commit 7e941861c9
2 changed files with 44 additions and 4 deletions
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40
drivers/gpu/drm/i915/i915_sw_fence.c
View File

@ -13,6 +13,8 @@
#include "i915_sw_fence.h"
#define I915_SW_FENCE_FLAG_ALLOC BIT(3) /* after WQ_FLAG_* for safety */
static DEFINE_SPINLOCK(i915_sw_fence_lock);
static int __i915_sw_fence_notify(struct i915_sw_fence *fence,
@ -135,6 +137,8 @@ static int i915_sw_fence_wake(wait_queue_t *wq, unsigned mode, int flags, void *
list_del(&wq->task_list);
__i915_sw_fence_complete(wq->private, key);
i915_sw_fence_put(wq->private);
if (wq->flags & I915_SW_FENCE_FLAG_ALLOC)
kfree(wq);
return 0;
}
@ -192,9 +196,9 @@ static bool i915_sw_fence_check_if_after(struct i915_sw_fence *fence,
return err;
}
int i915_sw_fence_await_sw_fence(struct i915_sw_fence *fence,
struct i915_sw_fence *signaler,
wait_queue_t *wq)
static int __i915_sw_fence_await_sw_fence(struct i915_sw_fence *fence,
struct i915_sw_fence *signaler,
wait_queue_t *wq, gfp_t gfp)
{
unsigned long flags;
int pending;
@ -206,8 +210,22 @@ int i915_sw_fence_await_sw_fence(struct i915_sw_fence *fence,
if (unlikely(i915_sw_fence_check_if_after(fence, signaler)))
return -EINVAL;
pending = 0;
if (!wq) {
wq = kmalloc(sizeof(*wq), gfp);
if (!wq) {
if (!gfpflags_allow_blocking(gfp))
return -ENOMEM;
i915_sw_fence_wait(signaler);
return 0;
}
pending |= I915_SW_FENCE_FLAG_ALLOC;
}
INIT_LIST_HEAD(&wq->task_list);
wq->flags = 0;
wq->flags = pending;
wq->func = i915_sw_fence_wake;
wq->private = i915_sw_fence_get(fence);
@ -226,6 +244,20 @@ int i915_sw_fence_await_sw_fence(struct i915_sw_fence *fence,
return pending;
}
int i915_sw_fence_await_sw_fence(struct i915_sw_fence *fence,
struct i915_sw_fence *signaler,
wait_queue_t *wq)
{
return __i915_sw_fence_await_sw_fence(fence, signaler, wq, 0);
}
int i915_sw_fence_await_sw_fence_gfp(struct i915_sw_fence *fence,
struct i915_sw_fence *signaler,
gfp_t gfp)
{
return __i915_sw_fence_await_sw_fence(fence, signaler, NULL, gfp);
}
struct i915_sw_dma_fence_cb {
struct dma_fence_cb base;
struct i915_sw_fence *fence;

8
drivers/gpu/drm/i915/i915_sw_fence.h
View File

@ -46,6 +46,9 @@ void i915_sw_fence_commit(struct i915_sw_fence *fence);
int i915_sw_fence_await_sw_fence(struct i915_sw_fence *fence,
struct i915_sw_fence *after,
wait_queue_t *wq);
int i915_sw_fence_await_sw_fence_gfp(struct i915_sw_fence *fence,
struct i915_sw_fence *after,
gfp_t gfp);
int i915_sw_fence_await_dma_fence(struct i915_sw_fence *fence,
struct dma_fence *dma,
unsigned long timeout,
@ -62,4 +65,9 @@ static inline bool i915_sw_fence_done(const struct i915_sw_fence *fence)
return atomic_read(&fence->pending) < 0;
}
static inline void i915_sw_fence_wait(struct i915_sw_fence *fence)
{
wait_event(fence->wait, i915_sw_fence_done(fence));
}
#endif /* _I915_SW_FENCE_H_ */