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Date: Fri, 12 Jun 2020 17:41:29 -0700 From: Fenghua Yu <fenghua.yu@...el.com> To: "Thomas Gleixner" <tglx@...utronix.de>, "Ingo Molnar" <mingo@...hat.com>, "Borislav Petkov" <bp@...en8.de>, "H Peter Anvin" <hpa@...or.com>, "David Woodhouse" <dwmw2@...radead.org>, "Lu Baolu" <baolu.lu@...ux.intel.com>, "Frederic Barrat" <fbarrat@...ux.ibm.com>, "Andrew Donnellan" <ajd@...ux.ibm.com>, "Felix Kuehling" <Felix.Kuehling@....com>, "Joerg Roedel" <joro@...tes.org>, "Dave Hansen" <dave.hansen@...el.com>, "Tony Luck" <tony.luck@...el.com>, "Ashok Raj" <ashok.raj@...el.com>, "Jacob Jun Pan" <jacob.jun.pan@...el.com>, "Dave Jiang" <dave.jiang@...el.com>, "Yu-cheng Yu" <yu-cheng.yu@...el.com>, "Sohil Mehta" <sohil.mehta@...el.com>, "Ravi V Shankar" <ravi.v.shankar@...el.com> Cc: "linux-kernel" <linux-kernel@...r.kernel.org>, "x86" <x86@...nel.org>, iommu@...ts.linux-foundation.org, "amd-gfx" <amd-gfx@...ts.freedesktop.org>, "linuxppc-dev" <linuxppc-dev@...ts.ozlabs.org>, Fenghua Yu <fenghua.yu@...el.com> Subject: [PATCH v2 08/12] mm: Define pasid in mm PASID is shared by all threads in a process. So the logical place to keep track of it is in the "mm". Both ARM and X86 need to use the PASID in the "mm". Suggested-by: Christoph Hellwig <hch@...radeed.org> Signed-off-by: Fenghua Yu <fenghua.yu@...el.com> Reviewed-by: Tony Luck <tony.luck@...el.com> --- v2: - This new patch moves "pasid" from x86 specific mm_context_t to generic struct mm_struct per Christopher's comment: https://lore.kernel.org/linux-iommu/20200414170252.714402-1-jean-philippe@linaro.org/T/#mb57110ffe1aaa24750eeea4f93b611f0d1913911 - Jean-Philippe Brucker released a virtually same patch. I still put this patch in the series for better review. The upstream kernel only needs one of the two patches eventually. https://lore.kernel.org/linux-iommu/20200519175502.2504091-2-jean-philippe@linaro.org/ - Change CONFIG_IOASID to CONFIG_PCI_PASID (Ashok) include/linux/mm_types.h | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/include/linux/mm_types.h b/include/linux/mm_types.h index 64ede5f150dc..5778db3aa42d 100644 --- a/include/linux/mm_types.h +++ b/include/linux/mm_types.h @@ -538,6 +538,10 @@ struct mm_struct { atomic_long_t hugetlb_usage; #endif struct work_struct async_put_work; + +#ifdef CONFIG_PCI_PASID + unsigned int pasid; +#endif } __randomize_layout; /* -- 2.19.1
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