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authorChristian König <christian.koenig@amd.com>2018-09-19 17:12:25 +0300
committerChristian König <christian.koenig@amd.com>2018-10-25 14:45:07 +0300
commitca05359f1e64cf8303ee532e50efe4ab7563d4a9 (patch)
tree853e9e47b788fa72fcc5b0cd099e4199ad6c78a0 /drivers/dma-buf
parent27836b641c1bf693c96c627388497b4e0f57441b (diff)
downloadlinux-ca05359f1e64cf8303ee532e50efe4ab7563d4a9.tar.xz
dma-buf: allow reserving more than one shared fence slot
Let's support simultaneous submissions to multiple engines. Signed-off-by: Christian König <christian.koenig@amd.com> Reviewed-by: Michel Dänzer <michel.daenzer@amd.com> Reviewed-by: Junwei Zhang <Jerry.Zhang@amd.com> Reviewed-by: Huang Rui <ray.huang@amd.com> Link: https://patchwork.kernel.org/patch/10626149/
Diffstat (limited to 'drivers/dma-buf')
-rw-r--r--drivers/dma-buf/reservation.c13
1 files changed, 8 insertions, 5 deletions
diff --git a/drivers/dma-buf/reservation.c b/drivers/dma-buf/reservation.c
index 5825fc336a13..5fb4fd461908 100644
--- a/drivers/dma-buf/reservation.c
+++ b/drivers/dma-buf/reservation.c
@@ -56,9 +56,10 @@ const char reservation_seqcount_string[] = "reservation_seqcount";
EXPORT_SYMBOL(reservation_seqcount_string);
/**
- * reservation_object_reserve_shared - Reserve space to add a shared
- * fence to a reservation_object.
+ * reservation_object_reserve_shared - Reserve space to add shared fences to
+ * a reservation_object.
* @obj: reservation object
+ * @num_fences: number of fences we want to add
*
* Should be called before reservation_object_add_shared_fence(). Must
* be called with obj->lock held.
@@ -66,7 +67,8 @@ EXPORT_SYMBOL(reservation_seqcount_string);
* RETURNS
* Zero for success, or -errno
*/
-int reservation_object_reserve_shared(struct reservation_object *obj)
+int reservation_object_reserve_shared(struct reservation_object *obj,
+ unsigned int num_fences)
{
struct reservation_object_list *old, *new;
unsigned int i, j, k, max;
@@ -74,10 +76,11 @@ int reservation_object_reserve_shared(struct reservation_object *obj)
old = reservation_object_get_list(obj);
if (old && old->shared_max) {
- if (old->shared_count < old->shared_max)
+ if ((old->shared_count + num_fences) <= old->shared_max)
return 0;
else
- max = old->shared_max * 2;
+ max = max(old->shared_count + num_fences,
+ old->shared_max * 2);
} else {
max = 4;
}