linux-kernel - [PATCH v2 08/12] mm: Define pasid in mm

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Message-Id: <1592008893-9388-9-git-send-email-fenghua.yu@intel.com>
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