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Date:   Wed, 6 Mar 2019 12:32:53 -0600
From:   "Andrew F. Davis" <afd@...com>
To:     John Stultz <john.stultz@...aro.org>
CC:     Benjamin Gaignard <benjamin.gaignard@...aro.org>,
        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>,
        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

On 3/6/19 12:19 PM, John Stultz wrote:
> On Wed, Mar 6, 2019 at 10:15 AM Andrew F. Davis <afd@...com> wrote:
>>
>> On 3/6/19 10:14 AM, Benjamin Gaignard wrote:
>>> 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.
>>>
>>
>> mmap is optional for DMA-BUFs, only attach/map are required. To test
>> those we would need a dummy device, so a test kernel module may be
>> needed to really exercise this.
>>
>> I have one I use for ION buffer testing, it consumes a DMA-BUF passed
>> from userspace, attach/maps it to a dummy device then return the
>> physical address of the first page of the buffer for validation. Might
>> be a good test, but dummy devices don't always have the proper dma
>> attributes set like a real device does, so it may also fail for some
>> otherwise valid buffers.
> 
> Cool! Do you mind sharing that? I might try to rework and integrate it
> into this patchset?
> 

Sure, top two patches here:

> https://git.ti.com/ti-analog-linux-kernel/afd-analog/commits/dma-buf-to-phys

Andrew

> thanks
> -john
> 

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