在 2018/12/4 19:59, Christian König 写道:
> For a lot of use cases we need 64bit sequence numbers. Currently drivers
> overload the dma_fence structure to store the additional bits.
>
> Stop doing that and make the sequence number in the dma_fence always
> 64bit.
>
> For compatibility with hardware which can do only 32bit sequences the
> comparisons in __dma_fence_is_later only takes the lower 32bits as significant
> when the upper 32bits are all zero.
>
> v2: change the logic in __dma_fence_is_later
>
> Signed-off-by: Christian König <christian.koe...@amd.com>
Reviewed-by: Chunming Zhou <david1.z...@amd.com>
> ---
> drivers/dma-buf/dma-fence.c | 2 +-
> drivers/dma-buf/sw_sync.c | 2 +-
> drivers/dma-buf/sync_file.c | 4 ++--
> drivers/gpu/drm/amd/amdgpu/amdgpu_sa.c | 2 +-
> drivers/gpu/drm/i915/i915_sw_fence.c | 2 +-
> drivers/gpu/drm/i915/intel_engine_cs.c | 2 +-
> drivers/gpu/drm/vgem/vgem_fence.c | 4 ++--
> include/linux/dma-fence.h | 22 +++++++++++++++-------
> 8 files changed, 24 insertions(+), 16 deletions(-)
>
> diff --git a/drivers/dma-buf/dma-fence.c b/drivers/dma-buf/dma-fence.c
> index 136ec04d683f..3aa8733f832a 100644
> --- a/drivers/dma-buf/dma-fence.c
> +++ b/drivers/dma-buf/dma-fence.c
> @@ -649,7 +649,7 @@ EXPORT_SYMBOL(dma_fence_wait_any_timeout);
> */
> void
> dma_fence_init(struct dma_fence *fence, const struct dma_fence_ops *ops,
> - spinlock_t *lock, u64 context, unsigned seqno)
> + spinlock_t *lock, u64 context, u64 seqno)
> {
> BUG_ON(!lock);
> BUG_ON(!ops || !ops->get_driver_name || !ops->get_timeline_name);
> diff --git a/drivers/dma-buf/sw_sync.c b/drivers/dma-buf/sw_sync.c
> index 53c1d6d36a64..32dcf7b4c935 100644
> --- a/drivers/dma-buf/sw_sync.c
> +++ b/drivers/dma-buf/sw_sync.c
> @@ -172,7 +172,7 @@ static bool timeline_fence_enable_signaling(struct
> dma_fence *fence)
> static void timeline_fence_value_str(struct dma_fence *fence,
> char *str, int size)
> {
> - snprintf(str, size, "%d", fence->seqno);
> + snprintf(str, size, "%lld", fence->seqno);
> }
>
> static void timeline_fence_timeline_value_str(struct dma_fence *fence,
> diff --git a/drivers/dma-buf/sync_file.c b/drivers/dma-buf/sync_file.c
> index 35dd06479867..4f6305ca52c8 100644
> --- a/drivers/dma-buf/sync_file.c
> +++ b/drivers/dma-buf/sync_file.c
> @@ -144,7 +144,7 @@ char *sync_file_get_name(struct sync_file *sync_file,
> char *buf, int len)
> } else {
> struct dma_fence *fence = sync_file->fence;
>
> - snprintf(buf, len, "%s-%s%llu-%d",
> + snprintf(buf, len, "%s-%s%llu-%lld",
> fence->ops->get_driver_name(fence),
> fence->ops->get_timeline_name(fence),
> fence->context,
> @@ -258,7 +258,7 @@ static struct sync_file *sync_file_merge(const char
> *name, struct sync_file *a,
>
> i_b++;
> } else {
> - if (pt_a->seqno - pt_b->seqno <= INT_MAX)
> + if (__dma_fence_is_later(pt_a->seqno, pt_b->seqno))
> add_fence(fences, &i, pt_a);
> else
> add_fence(fences, &i, pt_b);
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_sa.c
> b/drivers/gpu/drm/amd/amdgpu/amdgpu_sa.c
> index 12f2bf97611f..bfaf5c6323be 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_sa.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_sa.c
> @@ -388,7 +388,7 @@ void amdgpu_sa_bo_dump_debug_info(struct
> amdgpu_sa_manager *sa_manager,
> soffset, eoffset, eoffset - soffset);
>
> if (i->fence)
> - seq_printf(m, " protected by 0x%08x on context %llu",
> + seq_printf(m, " protected by 0x%016llx on context %llu",
> i->fence->seqno, i->fence->context);
>
> seq_printf(m, "\n");
> diff --git a/drivers/gpu/drm/i915/i915_sw_fence.c
> b/drivers/gpu/drm/i915/i915_sw_fence.c
> index 6dbeed079ae5..11bcdabd5177 100644
> --- a/drivers/gpu/drm/i915/i915_sw_fence.c
> +++ b/drivers/gpu/drm/i915/i915_sw_fence.c
> @@ -393,7 +393,7 @@ static void timer_i915_sw_fence_wake(struct timer_list *t)
> if (!fence)
> return;
>
> - pr_notice("Asynchronous wait on fence %s:%s:%x timed out (hint:%pS)\n",
> + pr_notice("Asynchronous wait on fence %s:%s:%llx timed out
> (hint:%pS)\n",
> cb->dma->ops->get_driver_name(cb->dma),
> cb->dma->ops->get_timeline_name(cb->dma),
> cb->dma->seqno,
> diff --git a/drivers/gpu/drm/i915/intel_engine_cs.c
> b/drivers/gpu/drm/i915/intel_engine_cs.c
> index 217ed3ee1cab..f28a66c67d34 100644
> --- a/drivers/gpu/drm/i915/intel_engine_cs.c
> +++ b/drivers/gpu/drm/i915/intel_engine_cs.c
> @@ -1236,7 +1236,7 @@ static void print_request(struct drm_printer *m,
>
> x = print_sched_attr(rq->i915, &rq->sched.attr, buf, x, sizeof(buf));
>
> - drm_printf(m, "%s%x%s [%llx:%x]%s @ %dms: %s\n",
> + drm_printf(m, "%s%x%s [%llx:%llx]%s @ %dms: %s\n",
> prefix,
> rq->global_seqno,
> i915_request_completed(rq) ? "!" : "",
> diff --git a/drivers/gpu/drm/vgem/vgem_fence.c
> b/drivers/gpu/drm/vgem/vgem_fence.c
> index c1c420afe2dd..eb17c0cd3727 100644
> --- a/drivers/gpu/drm/vgem/vgem_fence.c
> +++ b/drivers/gpu/drm/vgem/vgem_fence.c
> @@ -53,13 +53,13 @@ static void vgem_fence_release(struct dma_fence *base)
>
> static void vgem_fence_value_str(struct dma_fence *fence, char *str, int
> size)
> {
> - snprintf(str, size, "%u", fence->seqno);
> + snprintf(str, size, "%llu", fence->seqno);
> }
>
> static void vgem_fence_timeline_value_str(struct dma_fence *fence, char
> *str,
> int size)
> {
> - snprintf(str, size, "%u",
> + snprintf(str, size, "%llu",
> dma_fence_is_signaled(fence) ? fence->seqno : 0);
> }
>
> diff --git a/include/linux/dma-fence.h b/include/linux/dma-fence.h
> index 999e4b104410..6b788467b2e3 100644
> --- a/include/linux/dma-fence.h
> +++ b/include/linux/dma-fence.h
> @@ -77,7 +77,7 @@ struct dma_fence {
> struct list_head cb_list;
> spinlock_t *lock;
> u64 context;
> - unsigned seqno;
> + u64 seqno;
> unsigned long flags;
> ktime_t timestamp;
> int error;
> @@ -244,7 +244,7 @@ struct dma_fence_ops {
> };
>
> void dma_fence_init(struct dma_fence *fence, const struct dma_fence_ops
> *ops,
> - spinlock_t *lock, u64 context, unsigned seqno);
> + spinlock_t *lock, u64 context, u64 seqno);
>
> void dma_fence_release(struct kref *kref);
> void dma_fence_free(struct dma_fence *fence);
> @@ -414,9 +414,17 @@ dma_fence_is_signaled(struct dma_fence *fence)
> * Returns true if f1 is chronologically later than f2. Both fences must be
> * from the same context, since a seqno is not common across contexts.
> */
> -static inline bool __dma_fence_is_later(u32 f1, u32 f2)
> +static inline bool __dma_fence_is_later(u64 f1, u64 f2)
> {
> - return (int)(f1 - f2) > 0;
> + /* This is for backward compatibility with drivers which can only handle
> + * 32bit sequence numbers. Use a 64bit compare when any of the higher
> + * bits are none zero, otherwise use a 32bit compare with wrap around
> + * handling.
> + */
> + if (upper_32_bits(f1) || upper_32_bits(f2))
> + return f1 > f2;
> +
> + return (int)(lower_32_bits(f1) - lower_32_bits(f2)) > 0;
> }
>
> /**
> @@ -548,21 +556,21 @@ u64 dma_fence_context_alloc(unsigned num);
> do { \
> struct dma_fence *__ff = (f); \
> if (IS_ENABLED(CONFIG_DMA_FENCE_TRACE)) \
> - pr_info("f %llu#%u: " fmt, \
> + pr_info("f %llu#%llu: " fmt, \
> __ff->context, __ff->seqno, ##args); \
> } while (0)
>
> #define DMA_FENCE_WARN(f, fmt, args...) \
> do { \
> struct dma_fence *__ff = (f); \
> - pr_warn("f %llu#%u: " fmt, __ff->context, __ff->seqno, \
> + pr_warn("f %llu#%llu: " fmt, __ff->context, __ff->seqno,\
> ##args); \
> } while (0)
>
> #define DMA_FENCE_ERR(f, fmt, args...) \
> do { \
> struct dma_fence *__ff = (f); \
> - pr_err("f %llu#%u: " fmt, __ff->context, __ff->seqno, \
> + pr_err("f %llu#%llu: " fmt, __ff->context, __ff->seqno, \
> ##args); \
> } while (0)
>
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