On 2018-05-17 09:05 PM, Andrey Grodzovsky wrote:
> On 05/17/2018 10:48 AM, Michel Dänzer wrote:
>> On 2018-05-17 01:18 PM, Andrey Grodzovsky wrote:
>>> Hi Michele and others, I am trying to implement the approach bellow to
>>> resolve AMDGPU's hang when commands are stuck in pipe during process
>>> exit.
>>>
>>> I noticed that once I implemented the file_operation.flush callback
>>> then during run of X, i see the flush callback gets called not only for
>>> Xorg process but for other
>>>
>>> processes such as 'xkbcomp' and even 'sh', it seems like Xorg passes his
>>> FDs to children, Christian mentioned he remembered a discussion to
>>> always set FD_CLOEXEC flag when opening the hardware device file, so
>>>
>>> we suspect a bug in Xorg with regard to this behavior.
>> Try the libdrm patch below.
>>
>> Note that the X server passes DRM file descriptors to DRI3 clients.
>
> Tried it, didn't help. I still see other processes calling .flush for
> /dev/dri/card0
Try the attached xserver patch on top. With these patches, I no longer
see any DRM file descriptors being opened without O_CLOEXEC running Xorg
-pogo in strace.
Anyway, the kernel can't rely on userspace using O_CLOEXEC. If the flush
callback being called from multiple processes is an issue, maybe the
flush callback isn't appropriate after all.
--
Earthling Michel Dänzer | http://www.amd.com
Libre software enthusiast | Mesa and X developer
diff --git a/hw/xfree86/drivers/modesetting/driver.c b/hw/xfree86/drivers/modesetting/driver.c
index 5d8906d63..306541f33 100644
--- a/hw/xfree86/drivers/modesetting/driver.c
+++ b/hw/xfree86/drivers/modesetting/driver.c
@@ -200,12 +200,12 @@ open_hw(const char *dev)
int fd;
if (dev)
- fd = open(dev, O_RDWR, 0);
+ fd = open(dev, O_RDWR | O_CLOEXEC, 0);
else {
dev = getenv("KMSDEVICE");
- if ((NULL == dev) || ((fd = open(dev, O_RDWR, 0)) == -1)) {
+ if ((NULL == dev) || ((fd = open(dev, O_RDWR | O_CLOEXEC, 0)) == -1)) {
dev = "/dev/dri/card0";
- fd = open(dev, O_RDWR, 0);
+ fd = open(dev, O_RDWR | O_CLOEXEC, 0);
}
}
if (fd == -1)
diff --git a/hw/xfree86/os-support/linux/lnx_platform.c b/hw/xfree86/os-support/linux/lnx_platform.c
index 11af52c46..70374ace8 100644
--- a/hw/xfree86/os-support/linux/lnx_platform.c
+++ b/hw/xfree86/os-support/linux/lnx_platform.c
@@ -43,7 +43,7 @@ get_drm_info(struct OdevAttributes *attribs, char *path, int delayed_index)
}
if (fd == -1)
- fd = open(path, O_RDWR, O_CLOEXEC);
+ fd = open(path, O_RDWR | O_CLOEXEC, 0);
if (fd == -1)
return FALSE;
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