Bug 98490 - Cannot map or read sub-buffer of CL_MEM_ALLOC_HOST_PTR buffer
Summary: Cannot map or read sub-buffer of CL_MEM_ALLOC_HOST_PTR buffer
Alias: None
Product: Beignet
Classification: Unclassified
Component: Beignet (show other bugs)
Version: unspecified
Hardware: x86-64 (AMD64) Linux (All)
: medium normal
Assignee: Guo Yejun
QA Contact:
Depends on:
Reported: 2016-10-29 10:53 UTC by Kai
Modified: 2016-12-05 02:31 UTC (History)
2 users (show)

See Also:
i915 platform:
i915 features:

Minimal example to reproduce (2.12 KB, text/x-c)
2016-10-29 10:53 UTC, Kai

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.

Comment 3 Kai 2016-12-03 11:21:02 UTC
Seems to be fixed in current master, thanks all!

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