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f5863a00e7
Currently, amd_iommu_pc_get_max_[banks|counters]() use end-point device ID to locate an IOMMU and check the reported max banks/counters. The logic assumes that the IOMMU_BASE_DEVID belongs to the first IOMMU, and uses it to acquire a reference to the first IOMMU, which does not work on certain systems. Instead, modify the function to take an IOMMU index, and use it to query the corresponding AMD IOMMU instance. Currently, hardcode the IOMMU index to 0 since the current AMD IOMMU perf implementation supports only a single IOMMU. A subsequent patch will add support for multiple IOMMUs, and will use a proper IOMMU index. Signed-off-by: Suravee Suthikulpanit <Suravee.Suthikulpanit@amd.com> Signed-off-by: Borislav Petkov <bp@suse.de> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Jiri Olsa <jolsa@redhat.com> Cc: Jörg Rödel <joro@8bytes.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Stephane Eranian <eranian@google.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Vince Weaver <vincent.weaver@maine.edu> Cc: iommu@lists.linux-foundation.org Link: http://lkml.kernel.org/r/1487926102-13073-7-git-send-email-Suravee.Suthikulpanit@amd.com Signed-off-by: Ingo Molnar <mingo@kernel.org> |
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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.