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From: "Andrew F. Davis" <afd@ti.com>
To: John Stultz <john.stultz@linaro.org>
Cc: Alistair Strachan <astrachan@google.com>,
	Greg KH <gregkh@linuxfoundation.org>,
	Chenbo Feng <fengc@google.com>,
	lkml <linux-kernel@vger.kernel.org>,
	Liam Mark <lmark@codeaurora.org>,
	ML dri-devel <dri-devel@lists.freedesktop.org>
Subject: Re: [RFC][PATCH 5/5 v2] kselftests: Add dma-heap test
Date: Wed, 6 Mar 2019 12:32:53 -0600	[thread overview]
Message-ID: <5fbeb711-62f9-1619-cc50-15594713551f@ti.com> (raw)
In-Reply-To: <CALAqxLU9aq6Qj1qJKQK=a5AbnLc1Hwxvb0nX9JemoW=29gDVoA@mail.gmail.com>

On 3/6/19 12:19 PM, John Stultz wrote:
> On Wed, Mar 6, 2019 at 10:15 AM Andrew F. Davis <afd@ti.com> wrote:
>>
>> On 3/6/19 10:14 AM, Benjamin Gaignard wrote:
>>> Le mar. 5 mars 2019 à 21:54, John Stultz <john.stultz@linaro.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@redhat.com>
>>>> Cc: Benjamin Gaignard <benjamin.gaignard@linaro.org>
>>>> Cc: Greg KH <gregkh@linuxfoundation.org>
>>>> Cc: Sumit Semwal <sumit.semwal@linaro.org>
>>>> Cc: Liam Mark <lmark@codeaurora.org>
>>>> Cc: Brian Starkey <Brian.Starkey@arm.com>
>>>> Cc: Andrew F. Davis <afd@ti.com>
>>>> Cc: Chenbo Feng <fengc@google.com>
>>>> Cc: Alistair Strachan <astrachan@google.com>
>>>> Cc: dri-devel@lists.freedesktop.org
>>>> Signed-off-by: John Stultz <john.stultz@linaro.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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  reply	other threads:[~2019-03-06 18:33 UTC|newest]

Thread overview: 69+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-03-05 20:54 [RFC][PATCH 0/5 v2] DMA-BUF Heaps (destaging ION) John Stultz
2019-03-05 20:54 ` [RFC][PATCH 1/5 v2] dma-buf: Add dma-buf heaps framework John Stultz
2019-03-06 16:12   ` Benjamin Gaignard
2019-03-06 16:57     ` John Stultz
2019-03-15  8:55     ` Christoph Hellwig
2019-03-06 16:27   ` Andrew F. Davis
2019-03-06 19:03     ` John Stultz
2019-03-06 21:45       ` Andrew F. Davis
2019-03-15  8:54   ` Christoph Hellwig
2019-03-15 20:24     ` Andrew F. Davis
2019-03-15 20:18   ` Laura Abbott
2019-03-15 20:49     ` Andrew F. Davis
2019-03-15 21:29     ` John Stultz
2019-03-15 22:44       ` Laura Abbott
2019-03-18  4:38         ` Sumit Semwal
2019-03-18  4:41         ` Sumit Semwal
2019-03-19 12:08   ` Brian Starkey
2019-03-19 15:24     ` Andrew F. Davis
2019-03-21 21:16     ` John Stultz
2019-03-27 14:53   ` Greg KH
2019-03-28  6:09     ` John Stultz
2019-03-05 20:54 ` [RFC][PATCH 2/5 v2] dma-buf: heaps: Add heap helpers John Stultz
2019-03-13 20:18   ` Liam Mark
2019-03-13 21:48     ` Andrew F. Davis
2019-03-13 22:57       ` Liam Mark
2019-03-13 23:42         ` Andrew F. Davis
2019-03-15  9:06   ` Christoph Hellwig
2019-03-19 15:03     ` Andrew F. Davis
2019-03-21 20:01     ` John Stultz
2019-03-19 14:26   ` Brian Starkey
2019-03-21 20:11     ` John Stultz
2019-03-21 20:35     ` Andrew F. Davis
2019-03-21 20:43   ` Andrew F. Davis
2019-03-05 20:54 ` [RFC][PATCH 3/5 v2] dma-buf: heaps: Add system heap to dmabuf heaps John Stultz
2019-03-06 16:01   ` Benjamin Gaignard
2019-03-11  5:48     ` John Stultz
2019-03-13 20:20   ` Liam Mark
2019-03-13 22:49     ` John Stultz
2019-03-15  9:06   ` Christoph Hellwig
2019-03-05 20:54 ` [RFC][PATCH 4/5 v2] dma-buf: heaps: Add CMA heap to dmabuf heapss John Stultz
2019-03-06 16:05   ` Benjamin Gaignard
2019-03-21 20:15     ` John Stultz
2019-03-15  9:06   ` Christoph Hellwig
2019-03-15 20:08     ` John Stultz
2019-03-19 14:53   ` Brian Starkey
2019-03-05 20:54 ` [RFC][PATCH 5/5 v2] kselftests: Add dma-heap test John Stultz
2019-03-06 16:14   ` Benjamin Gaignard
2019-03-06 16:35     ` Andrew F. Davis
2019-03-06 18:19       ` John Stultz
2019-03-06 18:32         ` Andrew F. Davis [this message]
2019-03-06 17:01     ` John Stultz
2019-03-15 20:07       ` Laura Abbott
2019-03-15 20:13         ` John Stultz
2019-03-15 20:49           ` Laura Abbott
2019-03-13 20:23   ` Liam Mark
2019-03-13 20:11 ` [RFC][PATCH 0/5 v2] DMA-BUF Heaps (destaging ION) Liam Mark
2019-03-13 22:30   ` John Stultz
2019-03-13 23:29     ` Liam Mark
2019-03-19 16:54     ` Benjamin Gaignard
2019-03-19 16:59       ` Andrew F. Davis
2019-03-19 21:58         ` Rob Clark
2019-03-19 22:36           ` John Stultz
2019-03-20  9:16             ` Benjamin Gaignard
2019-03-20 14:44               ` Andrew F. Davis
2019-03-20 15:59                 ` Benjamin Gaignard
2019-03-20 16:11               ` John Stultz
2019-03-15 20:34 ` Laura Abbott
2019-03-15 23:15 ` Jerome Glisse
2019-03-16  0:16   ` John Stultz

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