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-rw-r--r--drivers/dma-buf/st-dma-resv.c316
1 files changed, 316 insertions, 0 deletions
diff --git a/drivers/dma-buf/st-dma-resv.c b/drivers/dma-buf/st-dma-resv.c
new file mode 100644
index 000000000..15dbea146
--- /dev/null
+++ b/drivers/dma-buf/st-dma-resv.c
@@ -0,0 +1,316 @@
+/* SPDX-License-Identifier: MIT */
+
+/*
+* Copyright © 2019 Intel Corporation
+* Copyright © 2021 Advanced Micro Devices, Inc.
+*/
+
+#include <linux/slab.h>
+#include <linux/spinlock.h>
+#include <linux/dma-resv.h>
+
+#include "selftest.h"
+
+static struct spinlock fence_lock;
+
+static const char *fence_name(struct dma_fence *f)
+{
+ return "selftest";
+}
+
+static const struct dma_fence_ops fence_ops = {
+ .get_driver_name = fence_name,
+ .get_timeline_name = fence_name,
+};
+
+static struct dma_fence *alloc_fence(void)
+{
+ struct dma_fence *f;
+
+ f = kmalloc(sizeof(*f), GFP_KERNEL);
+ if (!f)
+ return NULL;
+
+ dma_fence_init(f, &fence_ops, &fence_lock, 0, 0);
+ return f;
+}
+
+static int sanitycheck(void *arg)
+{
+ struct dma_resv resv;
+ struct dma_fence *f;
+ int r;
+
+ f = alloc_fence();
+ if (!f)
+ return -ENOMEM;
+
+ dma_fence_enable_sw_signaling(f);
+
+ dma_fence_signal(f);
+ dma_fence_put(f);
+
+ dma_resv_init(&resv);
+ r = dma_resv_lock(&resv, NULL);
+ if (r)
+ pr_err("Resv locking failed\n");
+ else
+ dma_resv_unlock(&resv);
+ dma_resv_fini(&resv);
+ return r;
+}
+
+static int test_signaling(void *arg)
+{
+ enum dma_resv_usage usage = (unsigned long)arg;
+ struct dma_resv resv;
+ struct dma_fence *f;
+ int r;
+
+ f = alloc_fence();
+ if (!f)
+ return -ENOMEM;
+
+ dma_fence_enable_sw_signaling(f);
+
+ dma_resv_init(&resv);
+ r = dma_resv_lock(&resv, NULL);
+ if (r) {
+ pr_err("Resv locking failed\n");
+ goto err_free;
+ }
+
+ r = dma_resv_reserve_fences(&resv, 1);
+ if (r) {
+ pr_err("Resv shared slot allocation failed\n");
+ goto err_unlock;
+ }
+
+ dma_resv_add_fence(&resv, f, usage);
+ if (dma_resv_test_signaled(&resv, usage)) {
+ pr_err("Resv unexpectedly signaled\n");
+ r = -EINVAL;
+ goto err_unlock;
+ }
+ dma_fence_signal(f);
+ if (!dma_resv_test_signaled(&resv, usage)) {
+ pr_err("Resv not reporting signaled\n");
+ r = -EINVAL;
+ goto err_unlock;
+ }
+err_unlock:
+ dma_resv_unlock(&resv);
+err_free:
+ dma_resv_fini(&resv);
+ dma_fence_put(f);
+ return r;
+}
+
+static int test_for_each(void *arg)
+{
+ enum dma_resv_usage usage = (unsigned long)arg;
+ struct dma_resv_iter cursor;
+ struct dma_fence *f, *fence;
+ struct dma_resv resv;
+ int r;
+
+ f = alloc_fence();
+ if (!f)
+ return -ENOMEM;
+
+ dma_fence_enable_sw_signaling(f);
+
+ dma_resv_init(&resv);
+ r = dma_resv_lock(&resv, NULL);
+ if (r) {
+ pr_err("Resv locking failed\n");
+ goto err_free;
+ }
+
+ r = dma_resv_reserve_fences(&resv, 1);
+ if (r) {
+ pr_err("Resv shared slot allocation failed\n");
+ goto err_unlock;
+ }
+
+ dma_resv_add_fence(&resv, f, usage);
+
+ r = -ENOENT;
+ dma_resv_for_each_fence(&cursor, &resv, usage, fence) {
+ if (!r) {
+ pr_err("More than one fence found\n");
+ r = -EINVAL;
+ goto err_unlock;
+ }
+ if (f != fence) {
+ pr_err("Unexpected fence\n");
+ r = -EINVAL;
+ goto err_unlock;
+ }
+ if (dma_resv_iter_usage(&cursor) != usage) {
+ pr_err("Unexpected fence usage\n");
+ r = -EINVAL;
+ goto err_unlock;
+ }
+ r = 0;
+ }
+ if (r) {
+ pr_err("No fence found\n");
+ goto err_unlock;
+ }
+ dma_fence_signal(f);
+err_unlock:
+ dma_resv_unlock(&resv);
+err_free:
+ dma_resv_fini(&resv);
+ dma_fence_put(f);
+ return r;
+}
+
+static int test_for_each_unlocked(void *arg)
+{
+ enum dma_resv_usage usage = (unsigned long)arg;
+ struct dma_resv_iter cursor;
+ struct dma_fence *f, *fence;
+ struct dma_resv resv;
+ int r;
+
+ f = alloc_fence();
+ if (!f)
+ return -ENOMEM;
+
+ dma_fence_enable_sw_signaling(f);
+
+ dma_resv_init(&resv);
+ r = dma_resv_lock(&resv, NULL);
+ if (r) {
+ pr_err("Resv locking failed\n");
+ goto err_free;
+ }
+
+ r = dma_resv_reserve_fences(&resv, 1);
+ if (r) {
+ pr_err("Resv shared slot allocation failed\n");
+ dma_resv_unlock(&resv);
+ goto err_free;
+ }
+
+ dma_resv_add_fence(&resv, f, usage);
+ dma_resv_unlock(&resv);
+
+ r = -ENOENT;
+ dma_resv_iter_begin(&cursor, &resv, usage);
+ dma_resv_for_each_fence_unlocked(&cursor, fence) {
+ if (!r) {
+ pr_err("More than one fence found\n");
+ r = -EINVAL;
+ goto err_iter_end;
+ }
+ if (!dma_resv_iter_is_restarted(&cursor)) {
+ pr_err("No restart flag\n");
+ goto err_iter_end;
+ }
+ if (f != fence) {
+ pr_err("Unexpected fence\n");
+ r = -EINVAL;
+ goto err_iter_end;
+ }
+ if (dma_resv_iter_usage(&cursor) != usage) {
+ pr_err("Unexpected fence usage\n");
+ r = -EINVAL;
+ goto err_iter_end;
+ }
+
+ /* We use r as state here */
+ if (r == -ENOENT) {
+ r = -EINVAL;
+ /* That should trigger an restart */
+ cursor.fences = (void*)~0;
+ } else if (r == -EINVAL) {
+ r = 0;
+ }
+ }
+ if (r)
+ pr_err("No fence found\n");
+err_iter_end:
+ dma_resv_iter_end(&cursor);
+ dma_fence_signal(f);
+err_free:
+ dma_resv_fini(&resv);
+ dma_fence_put(f);
+ return r;
+}
+
+static int test_get_fences(void *arg)
+{
+ enum dma_resv_usage usage = (unsigned long)arg;
+ struct dma_fence *f, **fences = NULL;
+ struct dma_resv resv;
+ int r, i;
+
+ f = alloc_fence();
+ if (!f)
+ return -ENOMEM;
+
+ dma_fence_enable_sw_signaling(f);
+
+ dma_resv_init(&resv);
+ r = dma_resv_lock(&resv, NULL);
+ if (r) {
+ pr_err("Resv locking failed\n");
+ goto err_resv;
+ }
+
+ r = dma_resv_reserve_fences(&resv, 1);
+ if (r) {
+ pr_err("Resv shared slot allocation failed\n");
+ dma_resv_unlock(&resv);
+ goto err_resv;
+ }
+
+ dma_resv_add_fence(&resv, f, usage);
+ dma_resv_unlock(&resv);
+
+ r = dma_resv_get_fences(&resv, usage, &i, &fences);
+ if (r) {
+ pr_err("get_fences failed\n");
+ goto err_free;
+ }
+
+ if (i != 1 || fences[0] != f) {
+ pr_err("get_fences returned unexpected fence\n");
+ goto err_free;
+ }
+
+ dma_fence_signal(f);
+err_free:
+ while (i--)
+ dma_fence_put(fences[i]);
+ kfree(fences);
+err_resv:
+ dma_resv_fini(&resv);
+ dma_fence_put(f);
+ return r;
+}
+
+int dma_resv(void)
+{
+ static const struct subtest tests[] = {
+ SUBTEST(sanitycheck),
+ SUBTEST(test_signaling),
+ SUBTEST(test_for_each),
+ SUBTEST(test_for_each_unlocked),
+ SUBTEST(test_get_fences),
+ };
+ enum dma_resv_usage usage;
+ int r;
+
+ spin_lock_init(&fence_lock);
+ for (usage = DMA_RESV_USAGE_KERNEL; usage <= DMA_RESV_USAGE_BOOKKEEP;
+ ++usage) {
+ r = subtests(tests, (void *)(unsigned long)usage);
+ if (r)
+ return r;
+ }
+ return 0;
+}
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