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Message-ID: <78b49fc7e0302be282b4fcbd3f71fa4ae38e2d5f.1725941415.git-series.apopple@nvidia.com>
Date: Tue, 10 Sep 2024 14:14:33 +1000
From: Alistair Popple <apopple@...dia.com>
To: dan.j.williams@...el.com,
	linux-mm@...ck.org
Cc: Alistair Popple <apopple@...dia.com>,
	vishal.l.verma@...el.com,
	dave.jiang@...el.com,
	logang@...tatee.com,
	bhelgaas@...gle.com,
	jack@...e.cz,
	jgg@...pe.ca,
	catalin.marinas@....com,
	will@...nel.org,
	mpe@...erman.id.au,
	npiggin@...il.com,
	dave.hansen@...ux.intel.com,
	ira.weiny@...el.com,
	willy@...radead.org,
	djwong@...nel.org,
	tytso@....edu,
	linmiaohe@...wei.com,
	david@...hat.com,
	peterx@...hat.com,
	linux-doc@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linuxppc-dev@...ts.ozlabs.org,
	nvdimm@...ts.linux.dev,
	linux-cxl@...r.kernel.org,
	linux-fsdevel@...r.kernel.org,
	linux-ext4@...r.kernel.org,
	linux-xfs@...r.kernel.org,
	jhubbard@...dia.com,
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	david@...morbit.com
Subject: [PATCH 08/12] gup: Don't allow FOLL_LONGTERM pinning of FS DAX pages

Longterm pinning of FS DAX pages should already be disallowed by
various pXX_devmap checks. However a future change will cause these
checks to be invalid for FS DAX pages so make
folio_is_longterm_pinnable() return false for FS DAX pages.

Signed-off-by: Alistair Popple <apopple@...dia.com>
---
 include/linux/memremap.h | 11 +++++++++++
 include/linux/mm.h       |  4 ++++
 2 files changed, 15 insertions(+)

diff --git a/include/linux/memremap.h b/include/linux/memremap.h
index 14273e6..6a1406a 100644
--- a/include/linux/memremap.h
+++ b/include/linux/memremap.h
@@ -187,6 +187,17 @@ static inline bool folio_is_device_coherent(const struct folio *folio)
 	return is_device_coherent_page(&folio->page);
 }
 
+static inline bool is_device_dax_page(const struct page *page)
+{
+	return is_zone_device_page(page) &&
+		page_dev_pagemap(page)->type == MEMORY_DEVICE_FS_DAX;
+}
+
+static inline bool folio_is_device_dax(const struct folio *folio)
+{
+	return is_device_dax_page(&folio->page);
+}
+
 #ifdef CONFIG_ZONE_DEVICE
 void zone_device_page_init(struct page *page);
 void *memremap_pages(struct dev_pagemap *pgmap, int nid);
diff --git a/include/linux/mm.h b/include/linux/mm.h
index ae6d713..935e493 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -1989,6 +1989,10 @@ static inline bool folio_is_longterm_pinnable(struct folio *folio)
 	if (folio_is_device_coherent(folio))
 		return false;
 
+	/* DAX must also always allow eviction. */
+	if (folio_is_device_dax(folio))
+		return false;
+
 	/* Otherwise, non-movable zone folios can be pinned. */
 	return !folio_is_zone_movable(folio);
 
-- 
git-series 0.9.1

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