kselftests: Add dma-heap test

Add very trivial allocation and import test for dma-heaps,
utilizing the vgem driver as a test importer.

A good chunk of this code taken from:
  tools/testing/selftests/android/ion/ionmap_test.c
  Originally by Laura Abbott <labbott@redhat.com>

Cc: Benjamin Gaignard <benjamin.gaignard@linaro.org>
Cc: Sumit Semwal <sumit.semwal@linaro.org>
Cc: Liam Mark <lmark@codeaurora.org>
Cc: Pratik Patel <pratikp@codeaurora.org>
Cc: Brian Starkey <Brian.Starkey@arm.com>
Cc: Vincent Donnefort <Vincent.Donnefort@arm.com>
Cc: Sudipto Paul <Sudipto.Paul@arm.com>
Cc: Andrew F. Davis <afd@ti.com>
Cc: Christoph Hellwig <hch@infradead.org>
Cc: Chenbo Feng <fengc@google.com>
Cc: Alistair Strachan <astrachan@google.com>
Cc: Hridya Valsaraju <hridya@google.com>
Cc: Hillf Danton <hdanton@sina.com>
Cc: dri-devel@lists.freedesktop.org
Reviewed-by: Benjamin Gaignard <benjamin.gaignard@linaro.org>
Reviewed-by: Brian Starkey <brian.starkey@arm.com>
Acked-by: Laura Abbott <labbott@redhat.com>
Tested-by: Ayan Kumar Halder <ayan.halder@arm.com>
Signed-off-by: John Stultz <john.stultz@linaro.org>
Signed-off-by: Sumit Semwal <sumit.semwal@linaro.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20191021190310.85221-6-john.stultz@linaro.org

diff --git a/tools/testing/selftests/dmabuf-heaps/Makefile b/tools/testing/selftests/dmabuf-heaps/Makefile
new file mode 100644 (file)
index 0000000..8c4c36e
--- /dev/null
+++ b/tools/testing/selftests/dmabuf-heaps/Makefile
@@ -0,0 +1,9 @@
+# SPDX-License-Identifier: GPL-2.0
+CFLAGS += -static -O3 -Wl,-no-as-needed -Wall
+#LDLIBS += -lrt -lpthread -lm
+
+# these are all "safe" tests that don't modify
+# system time or require escalated privileges
+TEST_GEN_PROGS = dmabuf-heap
+
+include ../lib.mk

diff --git a/tools/testing/selftests/dmabuf-heaps/dmabuf-heap.c b/tools/testing/selftests/dmabuf-heaps/dmabuf-heap.c
new file mode 100644 (file)
index 0000000..b36dd9f
--- /dev/null
+++ b/tools/testing/selftests/dmabuf-heaps/dmabuf-heap.c
@@ -0,0 +1,238 @@
+// SPDX-License-Identifier: GPL-2.0
+
+#include <dirent.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdint.h>
+#include <string.h>
+#include <unistd.h>
+#include <sys/ioctl.h>
+#include <sys/mman.h>
+#include <sys/types.h>
+
+#include <linux/dma-buf.h>
+#include <drm/drm.h>
+
+#include "../../../../include/uapi/linux/dma-heap.h"
+
+#define DEVPATH "/dev/dma_heap"
+
+static int check_vgem(int fd)
+{
+       drm_version_t version = { 0 };
+       char name[5];
+       int ret;
+
+       version.name_len = 4;
+       version.name = name;
+
+       ret = ioctl(fd, DRM_IOCTL_VERSION, &version);
+       if (ret)
+               return 0;
+
+       return !strcmp(name, "vgem");
+}
+
+static int open_vgem(void)
+{
+       int i, fd;
+       const char *drmstr = "/dev/dri/card";
+
+       fd = -1;
+       for (i = 0; i < 16; i++) {
+               char name[80];
+
+               snprintf(name, 80, "%s%u", drmstr, i);
+
+               fd = open(name, O_RDWR);
+               if (fd < 0)
+                       continue;
+
+               if (!check_vgem(fd)) {
+                       close(fd);
+                       fd = -1;
+                       continue;
+               } else {
+                       break;
+               }
+       }
+       return fd;
+}
+
+static int import_vgem_fd(int vgem_fd, int dma_buf_fd, uint32_t *handle)
+{
+       struct drm_prime_handle import_handle = {
+               .fd = dma_buf_fd,
+               .flags = 0,
+               .handle = 0,
+        };
+       int ret;
+
+       ret = ioctl(vgem_fd, DRM_IOCTL_PRIME_FD_TO_HANDLE, &import_handle);
+       if (ret == 0)
+               *handle = import_handle.handle;
+       return ret;
+}
+
+static void close_handle(int vgem_fd, uint32_t handle)
+{
+       struct drm_gem_close close = {
+               .handle = handle,
+       };
+
+       ioctl(vgem_fd, DRM_IOCTL_GEM_CLOSE, &close);
+}
+
+static int dmabuf_heap_open(char *name)
+{
+       int ret, fd;
+       char buf[256];
+
+       ret = snprintf(buf, 256, "%s/%s", DEVPATH, name);
+       if (ret < 0) {
+               printf("snprintf failed!\n");
+               return ret;
+       }
+
+       fd = open(buf, O_RDWR);
+       if (fd < 0)
+               printf("open %s failed!\n", buf);
+       return fd;
+}
+
+static int dmabuf_heap_alloc(int fd, size_t len, unsigned int flags,
+                            int *dmabuf_fd)
+{
+       struct dma_heap_allocation_data data = {
+               .len = len,
+               .fd_flags = O_RDWR | O_CLOEXEC,
+               .heap_flags = flags,
+       };
+       int ret;
+
+       if (!dmabuf_fd)
+               return -EINVAL;
+
+       ret = ioctl(fd, DMA_HEAP_IOC_ALLOC, &data);
+       if (ret < 0)
+               return ret;
+       *dmabuf_fd = (int)data.fd;
+       return ret;
+}
+
+static void dmabuf_sync(int fd, int start_stop)
+{
+       struct dma_buf_sync sync = {
+               .flags = start_stop | DMA_BUF_SYNC_RW,
+       };
+       int ret;
+
+       ret = ioctl(fd, DMA_BUF_IOCTL_SYNC, &sync);
+       if (ret)
+               printf("sync failed %d\n", errno);
+}
+
+#define ONE_MEG (1024 * 1024)
+
+static int do_test(char *heap_name)
+{
+       int heap_fd = -1, dmabuf_fd = -1, importer_fd = -1;
+       uint32_t handle = 0;
+       void *p = NULL;
+       int ret;
+
+       printf("Testing heap: %s\n", heap_name);
+
+       heap_fd = dmabuf_heap_open(heap_name);
+       if (heap_fd < 0)
+               return;
+
+       printf("Allocating 1 MEG\n");
+       ret = dmabuf_heap_alloc(heap_fd, ONE_MEG, 0, &dmabuf_fd);
+       if (ret) {
+               printf("Allocation Failed!\n");
+               ret = -1;
+               goto out;
+       }
+       /* mmap and write a simple pattern */
+       p = mmap(NULL,
+                ONE_MEG,
+                PROT_READ | PROT_WRITE,
+                MAP_SHARED,
+                dmabuf_fd,
+                0);
+       if (p == MAP_FAILED) {
+               printf("mmap() failed: %m\n");
+               ret = -1;
+               goto out;
+       }
+       printf("mmap passed\n");
+
+       dmabuf_sync(dmabuf_fd, DMA_BUF_SYNC_START);
+       memset(p, 1, ONE_MEG / 2);
+       memset((char *)p + ONE_MEG / 2, 0, ONE_MEG / 2);
+       dmabuf_sync(dmabuf_fd, DMA_BUF_SYNC_END);
+
+       importer_fd = open_vgem();
+       if (importer_fd < 0) {
+               ret = importer_fd;
+               printf("Failed to open vgem\n");
+               goto out;
+       }
+
+       ret = import_vgem_fd(importer_fd, dmabuf_fd, &handle);
+       if (ret < 0) {
+               printf("Failed to import buffer\n");
+               goto out;
+       }
+       printf("import passed\n");
+
+       dmabuf_sync(dmabuf_fd, DMA_BUF_SYNC_START);
+       memset(p, 0xff, ONE_MEG);
+       dmabuf_sync(dmabuf_fd, DMA_BUF_SYNC_END);
+       printf("syncs passed\n");
+
+       close_handle(importer_fd, handle);
+       ret = 0;
+
+out:
+       if (p)
+               munmap(p, ONE_MEG);
+       if (importer_fd >= 0)
+               close(importer_fd);
+       if (dmabuf_fd >= 0)
+               close(dmabuf_fd);
+       if (heap_fd >= 0)
+               close(heap_fd);
+
+       return ret;
+}
+
+int main(void)
+{
+       DIR *d;
+       struct dirent *dir;
+       int ret = -1;
+
+       d = opendir(DEVPATH);
+       if (!d) {
+               printf("No %s directory?\n", DEVPATH);
+               return -1;
+       }
+
+       while ((dir = readdir(d)) != NULL) {
+               if (!strncmp(dir->d_name, ".", 2))
+                       continue;
+               if (!strncmp(dir->d_name, "..", 3))
+                       continue;
+
+               ret = do_test(dir->d_name);
+               if (ret)
+                       break;
+       }
+       closedir(d);
+
+       return ret;
+}