Add new Qualcomm extension cl_qcom_ext_host_ptr_iocoherent.
diff --git a/extensions/qcom/cl_qcom_ext_host_ptr_iocoherent.txt b/extensions/qcom/cl_qcom_ext_host_ptr_iocoherent.txt
new file mode 100644
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+++ b/extensions/qcom/cl_qcom_ext_host_ptr_iocoherent.txt
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+Name Strings
+
+ cl_qcom_ext_host_ptr_iocoherent
+
+Contributors
+
+ Balaji Calidas, Qualcomm Technologies, Inc.
+ Manali Torpe, Qualcomm Innovation Center, Inc.
+ Sreelakshmi Haridas Maruthur, Qualcomm Innovation Center, Inc.
+
+Contact
+
+ bcalidas at qti dot qualcomm dot com
+
+Version
+
+ Version 4, 2018/03/06
+
+Number
+
+ OpenCL Extension #TBD
+
+Status
+
+ Shipping
+
+Extension Type
+
+ OpenCL device extension
+
+Dependencies
+
+ OpenCL 1.1 is required.
+ cl_qcom_ext_host_ptr is required.
+
+ This extension extends the functionality of cl_qcom_ext_host_ptr.
+
+Overview
+
+ This extension extends the functionality provided by cl_qcom_ext_host_ptr by
+ adding a new host cache policy. It allows applications to specify a new
+ value, CL_MEM_HOST_IOCOHERENT_QCOM, for
+ cl_mem_ext_host_ptr::host_cache_policy. When the application selects this
+ value for host cache policy, the imported allocation is mapped as
+ io-coherent for the GPU. This in turn avoids the need for the OpenCL driver
+ to explicitly issue CPU cache operation calls. Although GPU performance can
+ be slower in some cases for io-coherent allocations, the overall performance
+ can improve due to the elimination of explicit CPU cache operations.
+
+Header File
+
+ cl_ext.h
+
+New Tokens
+
+ Modification to handling of <host_ptr> argument of clCreateBuffer,
+ clCreateImage2D and clCreateImage3D when CL_MEM_EXT_HOST_PTR_QCOM is
+ specified in the <flags> argument.
+
+ New accepted value for cl_mem_ext_host_ptr::host_cache_policy:
+
+ CL_MEM_HOST_IOCOHERENT_QCOM 0x40A9
+
+ As described in the cl_qcom_ext_host_ptr spec, when CL_MEM_EXT_HOST_PTR_QCOM
+ is enabled in the <flags> argument, then <host_ptr> is interpreted as a
+ pointer to cl_mem_ext_host_ptr. The application must initialize
+ cl_mem_ext_host_ptr::host_cache_policy to one of CL_MEM_HOST_UNCACHED_QCOM,
+ CL_MEM_HOST_WRITEBACK_QCOM, or CL_MEM_HOST_IOCOHERENT_QCOM according to the
+ cache policy used in the host for this memory allocation.
+ CL_MEM_HOST_IOCOHERENT_QCOM can only be specified when the memory was
+ originally allocated as cached. Use of this value with an uncached
+ allocation will lead to undefined results.
+
+Revision History
+
+ Revision 1, 2018/01/03: Initial version.
+ Revision 2, 2018/01/15: Minor edits.
+ Revision 3, 2018/01/19: Formatting and misc changes. No functional changes.
+ Revision 4, 2018/03/06: Corrected token value.
+
