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PSL9D doesn't have a data-cache that needs to be flushed before resetting the card. However when cxl tries to flush data-cache on such a card, it times-out as PSL_Control register never indicates flush operation complete due to missing data-cache. This is usually indicated in the kernel logs with this message: "WARNING: cache flush timed out" To fix this the patch checks PSL_Debug register CDC-Field(BIT:27) which indicates the absence of a data-cache and sets a flag 'no_data_cache' in 'struct cxl_native' to indicate this. When cxl_data_cache_flush() is called it checks the flag and if set bails out early without requesting a data-cache flush operation to the PSL. Signed-off-by: Vaibhav Jain <vaibhav@linux.vnet.ibm.com> Acked-by: Andrew Donnellan <andrew.donnellan@au1.ibm.com> Acked-by: Frederic Barrat <fbarrat@linux.vnet.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> |
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Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. Please read the Documentation/process/changes.rst file, as it contains the requirements for building and running the kernel, and information about the problems which may result by upgrading your kernel.