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Wed, 25 Aug 2021 03:48:42 +0000 From: Alex Sierra To: akpm@linux-foundation.org, Felix.Kuehling@amd.com, linux-mm@kvack.org, rcampbell@nvidia.com, linux-ext4@vger.kernel.org, linux-xfs@vger.kernel.org Cc: amd-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org, hch@lst.de, jgg@nvidia.com, jglisse@redhat.com Subject: [PATCH v1 03/14] mm: add iomem vma selection for memory migration Date: Tue, 24 Aug 2021 22:48:17 -0500 Message-Id: <20210825034828.12927-4-alex.sierra@amd.com> X-Mailer: git-send-email 2.32.0 In-Reply-To: <20210825034828.12927-1-alex.sierra@amd.com> References: <20210825034828.12927-1-alex.sierra@amd.com> Content-Transfer-Encoding: 8bit Content-Type: text/plain X-ClientProxiedBy: SN7PR04CA0190.namprd04.prod.outlook.com (2603:10b6:806:126::15) To SA0PR12MB4430.namprd12.prod.outlook.com (2603:10b6:806:70::20) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 Received: from alex-MS-7B09.amd.com (165.204.78.1) by SN7PR04CA0190.namprd04.prod.outlook.com (2603:10b6:806:126::15) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.4436.19 via Frontend Transport; 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This particular device memory type should be accessible by the CPU, through IOMEM access. Typically, zone device public type memory falls into this category. Signed-off-by: Alex Sierra --- include/linux/migrate.h | 1 + mm/migrate.c | 3 ++- 2 files changed, 3 insertions(+), 1 deletion(-) diff --git a/include/linux/migrate.h b/include/linux/migrate.h index 4bb4e519e3f5..6b16f417384f 100644 --- a/include/linux/migrate.h +++ b/include/linux/migrate.h @@ -156,6 +156,7 @@ static inline unsigned long migrate_pfn(unsigned long pfn) enum migrate_vma_direction { MIGRATE_VMA_SELECT_SYSTEM = 1 << 0, MIGRATE_VMA_SELECT_DEVICE_PRIVATE = 1 << 1, + MIGRATE_VMA_SELECT_IOMEM = 1 << 2, }; struct migrate_vma { diff --git a/mm/migrate.c b/mm/migrate.c index e3a10e2a1bb3..d4ae2da99607 100644 --- a/mm/migrate.c +++ b/mm/migrate.c @@ -2406,7 +2406,8 @@ static int migrate_vma_collect_pmd(pmd_t *pmdp, if (is_write_device_private_entry(entry)) mpfn |= MIGRATE_PFN_WRITE; } else { - if (!(migrate->flags & MIGRATE_VMA_SELECT_SYSTEM)) + if (!(migrate->flags & MIGRATE_VMA_SELECT_SYSTEM) && + !(migrate->flags & MIGRATE_VMA_SELECT_IOMEM)) goto next; pfn = pte_pfn(pte); if (is_zero_pfn(pfn)) { -- 2.32.0