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charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org I'd like some advice on how a device driver could map normal, cacheable, non-shareable memory (currently not supported in the kernel). I have a device that contains areas of RAM and other internal memories that are outside of the coherency system, and it's a hardware requirement in this device that cacheable memory transactions to these areas be marked as non-shareable. In practical terms this means that Device or Normal_NC mappings work today, but Normal (cacheable) mappings will see transaction aborts (SErrors). An approach that appears to work is to define a pgprot_nonshared() macro in arch/arm64/include/asm/pgtable.h which sets the PTE SH bits to zero, and then define an arm64-specific pgprot_modify() that carries over the pgprot_nonshared() property, so the PTE changes aren't lost by vm_pgprot_modify(). That's a bit low-level, so I wonder if there's a better approach. Ideally I'd like a successful patch to be upstreamed, so I hope there's no intrinsic resistance to supporting non-shareable mappings. I'd appreciate your thoughts. Regards, David. _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel