linux-kernel - Re: [RFC][PATCH 5/5 v2] kselftests: Add dma-heap test

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Date:   Wed, 6 Mar 2019 17:14:35 +0100
From:   Benjamin Gaignard <benjamin.gaignard@...aro.org>
To:     John Stultz <john.stultz@...aro.org>
Cc:     lkml <linux-kernel@...r.kernel.org>,
        Laura Abbott <labbott@...hat.com>,
        Greg KH <gregkh@...uxfoundation.org>,
        Sumit Semwal <sumit.semwal@...aro.org>,
        Liam Mark <lmark@...eaurora.org>,
        Brian Starkey <Brian.Starkey@....com>,
        "Andrew F . Davis" <afd@...com>, Chenbo Feng <fengc@...gle.com>,
        Alistair Strachan <astrachan@...gle.com>,
        ML dri-devel <dri-devel@...ts.freedesktop.org>
Subject: Re: [RFC][PATCH 5/5 v2] kselftests: Add dma-heap test

Le mar. 5 mars 2019 à 21:54, John Stultz <john.stultz@...aro.org> a écrit :
>
> Add very trivial allocation test for dma-heaps.
>
> TODO: Need to actually do some validation on
> the returned dma-buf.
>
> Cc: Laura Abbott <labbott@...hat.com>
> Cc: Benjamin Gaignard <benjamin.gaignard@...aro.org>
> Cc: Greg KH <gregkh@...uxfoundation.org>
> Cc: Sumit Semwal <sumit.semwal@...aro.org>
> Cc: Liam Mark <lmark@...eaurora.org>
> Cc: Brian Starkey <Brian.Starkey@....com>
> Cc: Andrew F. Davis <afd@...com>
> Cc: Chenbo Feng <fengc@...gle.com>
> Cc: Alistair Strachan <astrachan@...gle.com>
> Cc: dri-devel@...ts.freedesktop.org
> Signed-off-by: John Stultz <john.stultz@...aro.org>
> ---
> v2: Switched to use reworked dma-heap apis
> ---
>  tools/testing/selftests/dmabuf-heaps/Makefile      | 11 +++
>  tools/testing/selftests/dmabuf-heaps/dmabuf-heap.c | 96 ++++++++++++++++++++++
>  2 files changed, 107 insertions(+)
>  create mode 100644 tools/testing/selftests/dmabuf-heaps/Makefile
>  create mode 100644 tools/testing/selftests/dmabuf-heaps/dmabuf-heap.c
>
> diff --git a/tools/testing/selftests/dmabuf-heaps/Makefile b/tools/testing/selftests/dmabuf-heaps/Makefile
> new file mode 100644
> index 0000000..c414ad3
> --- /dev/null
> +++ b/tools/testing/selftests/dmabuf-heaps/Makefile
> @@ -0,0 +1,11 @@
> +# 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
> index 0000000..06837a4
> --- /dev/null
> +++ b/tools/testing/selftests/dmabuf-heaps/dmabuf-heap.c
> @@ -0,0 +1,96 @@
> +// SPDX-License-Identifier: GPL-2.0
> +
> +#include <dirent.h>
> +#include <errno.h>
> +#include <fcntl.h>
> +#include <stdio.h>
> +#include <string.h>
> +#include <unistd.h>
> +#include <sys/ioctl.h>
> +#include <sys/mman.h>
> +#include <sys/types.h>
> +
> +#include "../../../../include/uapi/linux/dma-heap.h"
> +
> +#define DEVPATH "/dev/dma_heap"
> +
> +int dmabuf_heap_open(char *name)
> +{
> +       int ret, fd;
> +       char buf[256];
> +
> +       ret = sprintf(buf, "%s/%s", DEVPATH, name);
> +       if (ret < 0) {
> +               printf("sprintf failed!\n");
> +               return ret;
> +       }
> +
> +       fd = open(buf, O_RDWR);
> +       if (fd < 0)
> +               printf("open %s failed!\n", buf);
> +       return fd;
> +}
> +
> +int dmabuf_heap_alloc(int fd, size_t len, unsigned int flags, int *dmabuf_fd)
> +{
> +       struct dma_heap_allocation_data data = {
> +               .len = len,
> +               .flags = flags,
> +       };
> +       int ret;
> +
> +       if (dmabuf_fd == NULL)
> +               return -EINVAL;
> +
> +       ret = ioctl(fd, DMA_HEAP_IOC_ALLOC, &data);
> +       if (ret < 0)
> +               return ret;
> +       *dmabuf_fd = (int)data.fd;
> +       return ret;
> +}
> +
> +#define ONE_MEG (1024*1024)
> +
> +void do_test(char *heap_name)
> +{
> +       int heap_fd = -1, dmabuf_fd = -1;
> +       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)
> +               goto out;
> +
> +       /* DO SOMETHING WITH THE DMABUF HERE? */

You can do a call to mmap and write a pattern in the buffer.

Benjamin
> +
> +out:
> +       if (dmabuf_fd >= 0)
> +               close(dmabuf_fd);
> +       if (heap_fd >= 0)
> +               close(heap_fd);
> +}
> +
> +
> +int main(void)
> +{
> +       DIR *d;
> +       struct dirent *dir;
> +
> +       d = opendir(DEVPATH);
> +       if (!d) {
> +               printf("No %s directory?\n", DEVPATH);
> +               return -1;
> +       }
> +
> +       while ((dir = readdir(d)) != NULL)
> +               do_test(dir->d_name);
> +
> +
> +       return 0;
> +}
> --
> 2.7.4
>


-- 
Benjamin Gaignard

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