+ mm-add-device-coherent-vma-selection-for-memory-migration.patch added to mm-unstable branch

* + mm-add-device-coherent-vma-selection-for-memory-migration.patch added to mm-unstable branch
@ 2022-06-29 23:33 Andrew Morton
  0 siblings, 0 replies; 5+ messages in thread
From: Andrew Morton @ 2022-06-29 23:33 UTC (permalink / raw)
  To: mm-commits, willy, rcampbell, jglisse, jgg, hch, Felix.Kuehling,
	david, apopple, alex.sierra, akpm


The patch titled
     Subject: mm: add device coherent vma selection for memory migration
has been added to the -mm mm-unstable branch.  Its filename is
     mm-add-device-coherent-vma-selection-for-memory-migration.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-add-device-coherent-vma-selection-for-memory-migration.patch

This patch will later appear in the mm-unstable branch at
    git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

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------------------------------------------------------
From: Alex Sierra <alex.sierra@amd.com>
Subject: mm: add device coherent vma selection for memory migration
Date: Tue, 28 Jun 2022 22:54:16 -0500

This case is used to migrate pages from device memory, back to system
memory.  Device coherent type memory is cache coherent from device and CPU
point of view.

Link: https://lkml.kernel.org/r/20220629035426.20013-5-alex.sierra@amd.com
Signed-off-by: Alex Sierra <alex.sierra@amd.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Acked-by: Felix Kuehling <Felix.Kuehling@amd.com>
Reviewed-by: Alistair Poppple <apopple@nvidia.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: Jason Gunthorpe <jgg@nvidia.com>
Cc: Jerome Glisse <jglisse@redhat.com>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: Ralph Campbell <rcampbell@nvidia.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 include/linux/migrate.h |    1 +
 mm/migrate_device.c     |   12 +++++++++---
 2 files changed, 10 insertions(+), 3 deletions(-)

--- a/include/linux/migrate.h~mm-add-device-coherent-vma-selection-for-memory-migration
+++ a/include/linux/migrate.h
@@ -148,6 +148,7 @@ static inline unsigned long migrate_pfn(
 enum migrate_vma_direction {
 	MIGRATE_VMA_SELECT_SYSTEM = 1 << 0,
 	MIGRATE_VMA_SELECT_DEVICE_PRIVATE = 1 << 1,
+	MIGRATE_VMA_SELECT_DEVICE_COHERENT = 1 << 2,
 };
 
 struct migrate_vma {
--- a/mm/migrate_device.c~mm-add-device-coherent-vma-selection-for-memory-migration
+++ a/mm/migrate_device.c
@@ -148,15 +148,21 @@ again:
 			if (is_writable_device_private_entry(entry))
 				mpfn |= MIGRATE_PFN_WRITE;
 		} else {
-			if (!(migrate->flags & MIGRATE_VMA_SELECT_SYSTEM))
-				goto next;
 			pfn = pte_pfn(pte);
-			if (is_zero_pfn(pfn)) {
+			if (is_zero_pfn(pfn) &&
+			    (migrate->flags & MIGRATE_VMA_SELECT_SYSTEM)) {
 				mpfn = MIGRATE_PFN_MIGRATE;
 				migrate->cpages++;
 				goto next;
 			}
 			page = vm_normal_page(migrate->vma, addr, pte);
+			if (page && !is_zone_device_page(page) &&
+			    !(migrate->flags & MIGRATE_VMA_SELECT_SYSTEM))
+				goto next;
+			else if (page && is_device_coherent_page(page) &&
+			    (!(migrate->flags & MIGRATE_VMA_SELECT_DEVICE_COHERENT) ||
+			     page->pgmap->owner != migrate->pgmap_owner))
+				goto next;
 			mpfn = migrate_pfn(pfn) | MIGRATE_PFN_MIGRATE;
 			mpfn |= pte_write(pte) ? MIGRATE_PFN_WRITE : 0;
 		}
_

Patches currently in -mm which might be from alex.sierra@amd.com are

mm-rename-is_pinnable_pages-to-is_pinnable_longterm_pages.patch
mm-add-zone-device-coherent-type-memory-support.patch
mm-handling-non-lru-pages-returned-by-vm_normal_pages.patch
mm-add-device-coherent-vma-selection-for-memory-migration.patch
drm-amdkfd-add-spm-support-for-svm.patch
lib-test_hmm-add-ioctl-to-get-zone-device-type.patch
lib-test_hmm-add-module-param-for-zone-device-type.patch
lib-add-support-for-device-coherent-type-in-test_hmm.patch
tools-update-hmm-test-to-support-device-coherent-type.patch
tools-update-test_hmm-script-to-support-sp-config.patch
tools-add-hmm-gup-tests-for-device-coherent-type.patch
tools-add-selftests-to-hmm-for-cow-in-device-memory.patch


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