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-rw-r--r--drivers/dma-buf/st-dma-fence-unwrap.c382
1 files changed, 382 insertions, 0 deletions
diff --git a/drivers/dma-buf/st-dma-fence-unwrap.c b/drivers/dma-buf/st-dma-fence-unwrap.c
new file mode 100644
index 0000000000..f0cee984b6
--- /dev/null
+++ b/drivers/dma-buf/st-dma-fence-unwrap.c
@@ -0,0 +1,382 @@
+// SPDX-License-Identifier: MIT
+
+/*
+ * Copyright (C) 2022 Advanced Micro Devices, Inc.
+ */
+
+#include <linux/dma-fence.h>
+#include <linux/dma-fence-array.h>
+#include <linux/dma-fence-chain.h>
+#include <linux/dma-fence-unwrap.h>
+
+#include "selftest.h"
+
+#define CHAIN_SZ (4 << 10)
+
+struct mock_fence {
+ struct dma_fence base;
+ spinlock_t lock;
+};
+
+static const char *mock_name(struct dma_fence *f)
+{
+ return "mock";
+}
+
+static const struct dma_fence_ops mock_ops = {
+ .get_driver_name = mock_name,
+ .get_timeline_name = mock_name,
+};
+
+static struct dma_fence *mock_fence(void)
+{
+ struct mock_fence *f;
+
+ f = kmalloc(sizeof(*f), GFP_KERNEL);
+ if (!f)
+ return NULL;
+
+ spin_lock_init(&f->lock);
+ dma_fence_init(&f->base, &mock_ops, &f->lock,
+ dma_fence_context_alloc(1), 1);
+
+ return &f->base;
+}
+
+static struct dma_fence *mock_array(unsigned int num_fences, ...)
+{
+ struct dma_fence_array *array;
+ struct dma_fence **fences;
+ va_list valist;
+ int i;
+
+ fences = kcalloc(num_fences, sizeof(*fences), GFP_KERNEL);
+ if (!fences)
+ goto error_put;
+
+ va_start(valist, num_fences);
+ for (i = 0; i < num_fences; ++i)
+ fences[i] = va_arg(valist, typeof(*fences));
+ va_end(valist);
+
+ array = dma_fence_array_create(num_fences, fences,
+ dma_fence_context_alloc(1),
+ 1, false);
+ if (!array)
+ goto error_free;
+ return &array->base;
+
+error_free:
+ kfree(fences);
+
+error_put:
+ va_start(valist, num_fences);
+ for (i = 0; i < num_fences; ++i)
+ dma_fence_put(va_arg(valist, typeof(*fences)));
+ va_end(valist);
+ return NULL;
+}
+
+static struct dma_fence *mock_chain(struct dma_fence *prev,
+ struct dma_fence *fence)
+{
+ struct dma_fence_chain *f;
+
+ f = dma_fence_chain_alloc();
+ if (!f) {
+ dma_fence_put(prev);
+ dma_fence_put(fence);
+ return NULL;
+ }
+
+ dma_fence_chain_init(f, prev, fence, 1);
+ return &f->base;
+}
+
+static int sanitycheck(void *arg)
+{
+ struct dma_fence *f, *chain, *array;
+ int err = 0;
+
+ f = mock_fence();
+ if (!f)
+ return -ENOMEM;
+
+ dma_fence_enable_sw_signaling(f);
+
+ array = mock_array(1, f);
+ if (!array)
+ return -ENOMEM;
+
+ chain = mock_chain(NULL, array);
+ if (!chain)
+ return -ENOMEM;
+
+ dma_fence_put(chain);
+ return err;
+}
+
+static int unwrap_array(void *arg)
+{
+ struct dma_fence *fence, *f1, *f2, *array;
+ struct dma_fence_unwrap iter;
+ int err = 0;
+
+ f1 = mock_fence();
+ if (!f1)
+ return -ENOMEM;
+
+ dma_fence_enable_sw_signaling(f1);
+
+ f2 = mock_fence();
+ if (!f2) {
+ dma_fence_put(f1);
+ return -ENOMEM;
+ }
+
+ dma_fence_enable_sw_signaling(f2);
+
+ array = mock_array(2, f1, f2);
+ if (!array)
+ return -ENOMEM;
+
+ dma_fence_unwrap_for_each(fence, &iter, array) {
+ if (fence == f1) {
+ f1 = NULL;
+ } else if (fence == f2) {
+ f2 = NULL;
+ } else {
+ pr_err("Unexpected fence!\n");
+ err = -EINVAL;
+ }
+ }
+
+ if (f1 || f2) {
+ pr_err("Not all fences seen!\n");
+ err = -EINVAL;
+ }
+
+ dma_fence_put(array);
+ return err;
+}
+
+static int unwrap_chain(void *arg)
+{
+ struct dma_fence *fence, *f1, *f2, *chain;
+ struct dma_fence_unwrap iter;
+ int err = 0;
+
+ f1 = mock_fence();
+ if (!f1)
+ return -ENOMEM;
+
+ dma_fence_enable_sw_signaling(f1);
+
+ f2 = mock_fence();
+ if (!f2) {
+ dma_fence_put(f1);
+ return -ENOMEM;
+ }
+
+ dma_fence_enable_sw_signaling(f2);
+
+ chain = mock_chain(f1, f2);
+ if (!chain)
+ return -ENOMEM;
+
+ dma_fence_unwrap_for_each(fence, &iter, chain) {
+ if (fence == f1) {
+ f1 = NULL;
+ } else if (fence == f2) {
+ f2 = NULL;
+ } else {
+ pr_err("Unexpected fence!\n");
+ err = -EINVAL;
+ }
+ }
+
+ if (f1 || f2) {
+ pr_err("Not all fences seen!\n");
+ err = -EINVAL;
+ }
+
+ dma_fence_put(chain);
+ return err;
+}
+
+static int unwrap_chain_array(void *arg)
+{
+ struct dma_fence *fence, *f1, *f2, *array, *chain;
+ struct dma_fence_unwrap iter;
+ int err = 0;
+
+ f1 = mock_fence();
+ if (!f1)
+ return -ENOMEM;
+
+ dma_fence_enable_sw_signaling(f1);
+
+ f2 = mock_fence();
+ if (!f2) {
+ dma_fence_put(f1);
+ return -ENOMEM;
+ }
+
+ dma_fence_enable_sw_signaling(f2);
+
+ array = mock_array(2, f1, f2);
+ if (!array)
+ return -ENOMEM;
+
+ chain = mock_chain(NULL, array);
+ if (!chain)
+ return -ENOMEM;
+
+ dma_fence_unwrap_for_each(fence, &iter, chain) {
+ if (fence == f1) {
+ f1 = NULL;
+ } else if (fence == f2) {
+ f2 = NULL;
+ } else {
+ pr_err("Unexpected fence!\n");
+ err = -EINVAL;
+ }
+ }
+
+ if (f1 || f2) {
+ pr_err("Not all fences seen!\n");
+ err = -EINVAL;
+ }
+
+ dma_fence_put(chain);
+ return err;
+}
+
+static int unwrap_merge(void *arg)
+{
+ struct dma_fence *fence, *f1, *f2, *f3;
+ struct dma_fence_unwrap iter;
+ int err = 0;
+
+ f1 = mock_fence();
+ if (!f1)
+ return -ENOMEM;
+
+ dma_fence_enable_sw_signaling(f1);
+
+ f2 = mock_fence();
+ if (!f2) {
+ err = -ENOMEM;
+ goto error_put_f1;
+ }
+
+ dma_fence_enable_sw_signaling(f2);
+
+ f3 = dma_fence_unwrap_merge(f1, f2);
+ if (!f3) {
+ err = -ENOMEM;
+ goto error_put_f2;
+ }
+
+ dma_fence_unwrap_for_each(fence, &iter, f3) {
+ if (fence == f1) {
+ dma_fence_put(f1);
+ f1 = NULL;
+ } else if (fence == f2) {
+ dma_fence_put(f2);
+ f2 = NULL;
+ } else {
+ pr_err("Unexpected fence!\n");
+ err = -EINVAL;
+ }
+ }
+
+ if (f1 || f2) {
+ pr_err("Not all fences seen!\n");
+ err = -EINVAL;
+ }
+
+ dma_fence_put(f3);
+error_put_f2:
+ dma_fence_put(f2);
+error_put_f1:
+ dma_fence_put(f1);
+ return err;
+}
+
+static int unwrap_merge_complex(void *arg)
+{
+ struct dma_fence *fence, *f1, *f2, *f3, *f4, *f5;
+ struct dma_fence_unwrap iter;
+ int err = -ENOMEM;
+
+ f1 = mock_fence();
+ if (!f1)
+ return -ENOMEM;
+
+ dma_fence_enable_sw_signaling(f1);
+
+ f2 = mock_fence();
+ if (!f2)
+ goto error_put_f1;
+
+ dma_fence_enable_sw_signaling(f2);
+
+ f3 = dma_fence_unwrap_merge(f1, f2);
+ if (!f3)
+ goto error_put_f2;
+
+ /* The resulting array has the fences in reverse */
+ f4 = dma_fence_unwrap_merge(f2, f1);
+ if (!f4)
+ goto error_put_f3;
+
+ /* Signaled fences should be filtered, the two arrays merged. */
+ f5 = dma_fence_unwrap_merge(f3, f4, dma_fence_get_stub());
+ if (!f5)
+ goto error_put_f4;
+
+ err = 0;
+ dma_fence_unwrap_for_each(fence, &iter, f5) {
+ if (fence == f1) {
+ dma_fence_put(f1);
+ f1 = NULL;
+ } else if (fence == f2) {
+ dma_fence_put(f2);
+ f2 = NULL;
+ } else {
+ pr_err("Unexpected fence!\n");
+ err = -EINVAL;
+ }
+ }
+
+ if (f1 || f2) {
+ pr_err("Not all fences seen!\n");
+ err = -EINVAL;
+ }
+
+ dma_fence_put(f5);
+error_put_f4:
+ dma_fence_put(f4);
+error_put_f3:
+ dma_fence_put(f3);
+error_put_f2:
+ dma_fence_put(f2);
+error_put_f1:
+ dma_fence_put(f1);
+ return err;
+}
+
+int dma_fence_unwrap(void)
+{
+ static const struct subtest tests[] = {
+ SUBTEST(sanitycheck),
+ SUBTEST(unwrap_array),
+ SUBTEST(unwrap_chain),
+ SUBTEST(unwrap_chain_array),
+ SUBTEST(unwrap_merge),
+ SUBTEST(unwrap_merge_complex),
+ };
+
+ return subtests(tests, NULL);
+}