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-rw-r--r--drivers/dma-buf/dma-fence-array.c28
-rw-r--r--drivers/dma-buf/dma-fence-unwrap.c126
-rw-r--r--drivers/gpu/drm/display/drm_dp_mst_topology.c3
-rw-r--r--drivers/gpu/drm/sti/sti_mixer.c2
4 files changed, 92 insertions, 67 deletions
diff --git a/drivers/dma-buf/dma-fence-array.c b/drivers/dma-buf/dma-fence-array.c
index 8a08ffde31e7..6657d4b30af9 100644
--- a/drivers/dma-buf/dma-fence-array.c
+++ b/drivers/dma-buf/dma-fence-array.c
@@ -103,10 +103,36 @@ static bool dma_fence_array_enable_signaling(struct dma_fence *fence)
static bool dma_fence_array_signaled(struct dma_fence *fence)
{
struct dma_fence_array *array = to_dma_fence_array(fence);
+ int num_pending;
+ unsigned int i;
- if (atomic_read(&array->num_pending) > 0)
+ /*
+ * We need to read num_pending before checking the enable_signal bit
+ * to avoid racing with the enable_signaling() implementation, which
+ * might decrement the counter, and cause a partial check.
+ * atomic_read_acquire() pairs with atomic_dec_and_test() in
+ * dma_fence_array_enable_signaling()
+ *
+ * The !--num_pending check is here to account for the any_signaled case
+ * if we race with enable_signaling(), that means the !num_pending check
+ * in the is_signalling_enabled branch might be outdated (num_pending
+ * might have been decremented), but that's fine. The user will get the
+ * right value when testing again later.
+ */
+ num_pending = atomic_read_acquire(&array->num_pending);
+ if (test_bit(DMA_FENCE_FLAG_ENABLE_SIGNAL_BIT, &array->base.flags)) {
+ if (num_pending <= 0)
+ goto signal;
return false;
+ }
+
+ for (i = 0; i < array->num_fences; ++i) {
+ if (dma_fence_is_signaled(array->fences[i]) && !--num_pending)
+ goto signal;
+ }
+ return false;
+signal:
dma_fence_array_clear_pending_error(array);
return true;
}
diff --git a/drivers/dma-buf/dma-fence-unwrap.c b/drivers/dma-buf/dma-fence-unwrap.c
index 628af51c81af..6345062731f1 100644
--- a/drivers/dma-buf/dma-fence-unwrap.c
+++ b/drivers/dma-buf/dma-fence-unwrap.c
@@ -12,6 +12,7 @@
#include <linux/dma-fence-chain.h>
#include <linux/dma-fence-unwrap.h>
#include <linux/slab.h>
+#include <linux/sort.h>
/* Internal helper to start new array iteration, don't use directly */
static struct dma_fence *
@@ -59,6 +60,25 @@ struct dma_fence *dma_fence_unwrap_next(struct dma_fence_unwrap *cursor)
}
EXPORT_SYMBOL_GPL(dma_fence_unwrap_next);
+
+static int fence_cmp(const void *_a, const void *_b)
+{
+ struct dma_fence *a = *(struct dma_fence **)_a;
+ struct dma_fence *b = *(struct dma_fence **)_b;
+
+ if (a->context < b->context)
+ return -1;
+ else if (a->context > b->context)
+ return 1;
+
+ if (dma_fence_is_later(b, a))
+ return 1;
+ else if (dma_fence_is_later(a, b))
+ return -1;
+
+ return 0;
+}
+
/* Implementation for the dma_fence_merge() marco, don't use directly */
struct dma_fence *__dma_fence_unwrap_merge(unsigned int num_fences,
struct dma_fence **fences,
@@ -67,8 +87,7 @@ struct dma_fence *__dma_fence_unwrap_merge(unsigned int num_fences,
struct dma_fence_array *result;
struct dma_fence *tmp, **array;
ktime_t timestamp;
- unsigned int i;
- size_t count;
+ int i, j, count;
count = 0;
timestamp = ns_to_ktime(0);
@@ -96,78 +115,55 @@ struct dma_fence *__dma_fence_unwrap_merge(unsigned int num_fences,
if (!array)
return NULL;
- /*
- * This trashes the input fence array and uses it as position for the
- * following merge loop. This works because the dma_fence_merge()
- * wrapper macro is creating this temporary array on the stack together
- * with the iterators.
- */
- for (i = 0; i < num_fences; ++i)
- fences[i] = dma_fence_unwrap_first(fences[i], &iter[i]);
-
count = 0;
- do {
- unsigned int sel;
-
-restart:
- tmp = NULL;
- for (i = 0; i < num_fences; ++i) {
- struct dma_fence *next;
-
- while (fences[i] && dma_fence_is_signaled(fences[i]))
- fences[i] = dma_fence_unwrap_next(&iter[i]);
-
- next = fences[i];
- if (!next)
- continue;
-
- /*
- * We can't guarantee that inpute fences are ordered by
- * context, but it is still quite likely when this
- * function is used multiple times. So attempt to order
- * the fences by context as we pass over them and merge
- * fences with the same context.
- */
- if (!tmp || tmp->context > next->context) {
- tmp = next;
- sel = i;
-
- } else if (tmp->context < next->context) {
- continue;
-
- } else if (dma_fence_is_later(tmp, next)) {
- fences[i] = dma_fence_unwrap_next(&iter[i]);
- goto restart;
+ for (i = 0; i < num_fences; ++i) {
+ dma_fence_unwrap_for_each(tmp, &iter[i], fences[i]) {
+ if (!dma_fence_is_signaled(tmp)) {
+ array[count++] = dma_fence_get(tmp);
} else {
- fences[sel] = dma_fence_unwrap_next(&iter[sel]);
- goto restart;
+ ktime_t t = dma_fence_timestamp(tmp);
+
+ if (ktime_after(t, timestamp))
+ timestamp = t;
}
}
+ }
- if (tmp) {
- array[count++] = dma_fence_get(tmp);
- fences[sel] = dma_fence_unwrap_next(&iter[sel]);
- }
- } while (tmp);
+ if (count == 0 || count == 1)
+ goto return_fastpath;
- if (count == 0) {
- tmp = dma_fence_allocate_private_stub(ktime_get());
- goto return_tmp;
- }
+ sort(array, count, sizeof(*array), fence_cmp, NULL);
- if (count == 1) {
- tmp = array[0];
- goto return_tmp;
+ /*
+ * Only keep the most recent fence for each context.
+ */
+ j = 0;
+ for (i = 1; i < count; i++) {
+ if (array[i]->context == array[j]->context)
+ dma_fence_put(array[i]);
+ else
+ array[++j] = array[i];
}
-
- result = dma_fence_array_create(count, array,
- dma_fence_context_alloc(1),
- 1, false);
- if (!result) {
- tmp = NULL;
- goto return_tmp;
+ count = ++j;
+
+ if (count > 1) {
+ result = dma_fence_array_create(count, array,
+ dma_fence_context_alloc(1),
+ 1, false);
+ if (!result) {
+ for (i = 0; i < count; i++)
+ dma_fence_put(array[i]);
+ tmp = NULL;
+ goto return_tmp;
+ }
+ return &result->base;
}
- return &result->base;
+
+return_fastpath:
+ if (count == 0)
+ tmp = dma_fence_allocate_private_stub(timestamp);
+ else
+ tmp = array[0];
return_tmp:
kfree(array);
diff --git a/drivers/gpu/drm/display/drm_dp_mst_topology.c b/drivers/gpu/drm/display/drm_dp_mst_topology.c
index ac90118b9e7a..e6ee180815b2 100644
--- a/drivers/gpu/drm/display/drm_dp_mst_topology.c
+++ b/drivers/gpu/drm/display/drm_dp_mst_topology.c
@@ -320,6 +320,9 @@ static bool drm_dp_decode_sideband_msg_hdr(const struct drm_dp_mst_topology_mgr
hdr->broadcast = (buf[idx] >> 7) & 0x1;
hdr->path_msg = (buf[idx] >> 6) & 0x1;
hdr->msg_len = buf[idx] & 0x3f;
+ if (hdr->msg_len < 1) /* min space for body CRC */
+ return false;
+
idx++;
hdr->somt = (buf[idx] >> 7) & 0x1;
hdr->eomt = (buf[idx] >> 6) & 0x1;
diff --git a/drivers/gpu/drm/sti/sti_mixer.c b/drivers/gpu/drm/sti/sti_mixer.c
index 7e5f14646625..06c1b81912f7 100644
--- a/drivers/gpu/drm/sti/sti_mixer.c
+++ b/drivers/gpu/drm/sti/sti_mixer.c
@@ -137,7 +137,7 @@ static void mixer_dbg_crb(struct seq_file *s, int val)
}
}
-static void mixer_dbg_mxn(struct seq_file *s, void *addr)
+static void mixer_dbg_mxn(struct seq_file *s, void __iomem *addr)
{
int i;
generated by cgit v1.2.3-70-g09d2 (git 2.47.1) at 2024-12-25 02:16:59 +0000