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The conversion of stolen to use phys_addr_t (from essentially u32) sparked an interesting discussion. We treat stolen memory as only accessible from the GPU (the DMA device) - an attempt to use it from the CPU will generate a MCE on gen6 onwards, although it is in theory a physical address that can be dereferenced from the CPU as demonstrated by earlier generations. As such, using phys_addr_t has the wrong connotations and as we pass the address into the DMA device via dma_addr_t (through the scatterlists used to program the GTT entries), we should treat it as dma_addr_t throughout. Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Cc: Paulo Zanoni <paulo.r.zanoni@intel.com> Cc: Ville Syrjälä <ville.syrjala@linux.intel.com> Link: http://patchwork.freedesktop.org/patch/msgid/20170127165531.28135-1-chris@chris-wilson.co.uk Reviewed-by: Paulo Zanoni <paulo.r.zanoni@intel.com> |
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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.