Bug 98490

Summary:	Cannot map or read sub-buffer of CL_MEM_ALLOC_HOST_PTR buffer
Product:	Beignet	Reporter:	Kai <kai.scorpio>
Component:	Beignet	Assignee:	Guo Yejun <yejun.guo>
Status:	RESOLVED FIXED	QA Contact:
Severity:	normal
Priority:	medium	CC:	xiuli.pan, yejun.guo
Version:	unspecified
Hardware:	x86-64 (AMD64)
OS:	Linux (All)
Whiteboard:
i915 platform:		i915 features:
Attachments:	Minimal example to reproduce

Description Kai 2016-10-29 10:53:48 UTC

Created attachment 127602 [details]
Minimal example to reproduce

I cannot map or read from a sub-buffer if the parent buffer was created with CL_MEM_ALLOC_HOST_PTR. Attached file is a minimal test case that shows this, on my machine it prints '-12' and then exits with status code 1. I would expect it to return 0 with no output. Removing CL_MEM_ALLOC_HOST_PTR from clCreateBuffer fixes the issue.

If I understand correctly, this error code is CL_MAP_FAILURE, which should not be possible if the buffer was allocated with CL_MEM_ALLOC_HOST_PTR, which should be inherited by sub-buffers.

Otherwise all unit tests pass except profiling_exec on git master.

Device information from utests is:

> device_name "Intel(R) HD Graphics Haswell Ultrabook GT2 Mobile"

Please let me know if I have misunderstood the specification or can provide any more information.

Comment 1 Guo Yejun 2016-12-01 05:47:44 UTC

thanks Kai, the patch is in code review now, see https://lists.freedesktop.org/archives/beignet/2016-December/008277.html

Comment 2 Xiuli Pan 2016-12-01 07:15:10 UTC

Hi all,

The patch LGTM and will soon be merged in master.

Thanks
Xiuli

Comment 3 Kai 2016-12-03 11:21:02 UTC

Seems to be fixed in current master, thanks all!

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