[PATCH v2 6/6] mm/devm_memremap_pages: Fix final page put race

From: Dan Williams
Date: Tue May 07 2019 - 20:11:16 EST

Next message: Nobuhiro Iwamatsu: "Re: [PATCH 4.19 38/99] net: stmmac: use correct DMA buffer size in the RX descriptor"
Previous message: Dan Williams: "[PATCH v2 5/6] PCI/P2PDMA: Track pgmap references per resource, not globally"
In reply to: Dan Williams: "[PATCH v2 5/6] PCI/P2PDMA: Track pgmap references per resource, not globally"
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Logan noticed that devm_memremap_pages_release() kills the percpu_ref
drops all the page references that were acquired at init and then
immediately proceeds to unplug, arch_remove_memory(), the backing pages
for the pagemap. If for some reason device shutdown actually collides
with a busy / elevated-ref-count page then arch_remove_memory() should
be deferred until after that reference is dropped.

As it stands the "wait for last page ref drop" happens *after*
devm_memremap_pages_release() returns, which is obviously too late and
can lead to crashes.

Fix this situation by assigning the responsibility to wait for the
percpu_ref to go idle to devm_memremap_pages() with a new ->cleanup()
callback. Implement the new cleanup callback for all
devm_memremap_pages() users: pmem, devdax, hmm, and p2pdma.

Reported-by: Logan Gunthorpe <logang@xxxxxxxxxxxx>
Fixes: 41e94a851304 ("add devm_memremap_pages")
Cc: Bjorn Helgaas <bhelgaas@xxxxxxxxxx>
Cc: "JÃrÃme Glisse" <jglisse@xxxxxxxxxx>
Cc: Christoph Hellwig <hch@xxxxxx>
Reviewed-by: Ira Weiny <ira.weiny@xxxxxxxxx>
Signed-off-by: Dan Williams <dan.j.williams@xxxxxxxxx>
---
drivers/dax/device.c | 13 +++----------
drivers/nvdimm/pmem.c | 17 +++++++++++++----
drivers/pci/p2pdma.c | 17 +++--------------
include/linux/memremap.h | 2 ++
kernel/memremap.c | 17 ++++++++++++-----
mm/hmm.c | 14 +++-----------
tools/testing/nvdimm/test/iomap.c | 2 ++
7 files changed, 38 insertions(+), 44 deletions(-)

diff --git a/drivers/dax/device.c b/drivers/dax/device.c
index e428468ab661..e3aa78dd1bb0 100644
--- a/drivers/dax/device.c
+++ b/drivers/dax/device.c
@@ -27,9 +27,8 @@ static void dev_dax_percpu_release(struct percpu_ref *ref)
complete(&dev_dax->cmp);
}

-static void dev_dax_percpu_exit(void *data)
+static void dev_dax_percpu_exit(struct percpu_ref *ref)
{
- struct percpu_ref *ref = data;
struct dev_dax *dev_dax = ref_to_dev_dax(ref);

dev_dbg(&dev_dax->dev, "%s\n", __func__);
@@ -468,18 +467,12 @@ int dev_dax_probe(struct device *dev)
if (rc)
return rc;

- rc = devm_add_action_or_reset(dev, dev_dax_percpu_exit, &dev_dax->ref);
- if (rc)
- return rc;
-
dev_dax->pgmap.ref = &dev_dax->ref;
dev_dax->pgmap.kill = dev_dax_percpu_kill;
+ dev_dax->pgmap.cleanup = dev_dax_percpu_exit;
addr = devm_memremap_pages(dev, &dev_dax->pgmap);
- if (IS_ERR(addr)) {
- devm_remove_action(dev, dev_dax_percpu_exit, &dev_dax->ref);
- percpu_ref_exit(&dev_dax->ref);
+ if (IS_ERR(addr))
return PTR_ERR(addr);
- }

inode = dax_inode(dax_dev);
cdev = inode->i_cdev;
diff --git a/drivers/nvdimm/pmem.c b/drivers/nvdimm/pmem.c
index 0279eb1da3ef..1c9181712fa4 100644
--- a/drivers/nvdimm/pmem.c
+++ b/drivers/nvdimm/pmem.c
@@ -304,11 +304,19 @@ static const struct attribute_group *pmem_attribute_groups[] = {
NULL,
};

-static void pmem_release_queue(void *q)
+static void __pmem_release_queue(struct percpu_ref *ref)
{
+ struct request_queue *q;
+
+ q = container_of(ref, typeof(*q), q_usage_counter);
blk_cleanup_queue(q);
}

+static void pmem_release_queue(void *ref)
+{
+ __pmem_release_queue(ref);
+}
+
static void pmem_freeze_queue(struct percpu_ref *ref)
{
struct request_queue *q;
@@ -400,12 +408,10 @@ static int pmem_attach_disk(struct device *dev,
if (!q)
return -ENOMEM;

- if (devm_add_action_or_reset(dev, pmem_release_queue, q))
- return -ENOMEM;
-
pmem->pfn_flags = PFN_DEV;
pmem->pgmap.ref = &q->q_usage_counter;
pmem->pgmap.kill = pmem_freeze_queue;
+ pmem->pgmap.cleanup = __pmem_release_queue;
if (is_nd_pfn(dev)) {
if (setup_pagemap_fsdax(dev, &pmem->pgmap))
return -ENOMEM;
@@ -426,6 +432,9 @@ static int pmem_attach_disk(struct device *dev,
pmem->pfn_flags |= PFN_MAP;
memcpy(&bb_res, &pmem->pgmap.res, sizeof(bb_res));
} else {
+ if (devm_add_action_or_reset(dev, pmem_release_queue,
+ &q->q_usage_counter))
+ return -ENOMEM;
addr = devm_memremap(dev, pmem->phys_addr,
pmem->size, ARCH_MEMREMAP_PMEM);
memcpy(&bb_res, &nsio->res, sizeof(bb_res));
diff --git a/drivers/pci/p2pdma.c b/drivers/pci/p2pdma.c
index 54d475569058..a7a66b958720 100644
--- a/drivers/pci/p2pdma.c
+++ b/drivers/pci/p2pdma.c
@@ -95,7 +95,7 @@ static void pci_p2pdma_percpu_kill(struct percpu_ref *ref)
percpu_ref_kill(ref);
}

-static void pci_p2pdma_percpu_cleanup(void *ref)
+static void pci_p2pdma_percpu_cleanup(struct percpu_ref *ref)
{
struct p2pdma_pagemap *p2p_pgmap = to_p2p_pgmap(ref);

@@ -198,16 +198,6 @@ int pci_p2pdma_add_resource(struct pci_dev *pdev, int bar, size_t size,
if (error)
goto pgmap_free;

- /*
- * FIXME: the percpu_ref_exit needs to be coordinated internal
- * to devm_memremap_pages_release(). Duplicate the same ordering
- * as other devm_memremap_pages() users for now.
- */
- error = devm_add_action(&pdev->dev, pci_p2pdma_percpu_cleanup,
- &p2p_pgmap->ref);
- if (error)
- goto ref_cleanup;
-
pgmap = &p2p_pgmap->pgmap;

pgmap->res.start = pci_resource_start(pdev, bar) + offset;
@@ -218,11 +208,12 @@ int pci_p2pdma_add_resource(struct pci_dev *pdev, int bar, size_t size,
pgmap->pci_p2pdma_bus_offset = pci_bus_address(pdev, bar) -
pci_resource_start(pdev, bar);
pgmap->kill = pci_p2pdma_percpu_kill;
+ pgmap->cleanup = pci_p2pdma_percpu_cleanup;

addr = devm_memremap_pages(&pdev->dev, pgmap);
if (IS_ERR(addr)) {
error = PTR_ERR(addr);
- goto ref_exit;
+ goto pgmap_free;
}

error = gen_pool_add_owner(pdev->p2pdma->pool, (unsigned long)addr,
@@ -239,8 +230,6 @@ int pci_p2pdma_add_resource(struct pci_dev *pdev, int bar, size_t size,

pages_free:
devm_memunmap_pages(&pdev->dev, pgmap);
-ref_cleanup:
- percpu_ref_exit(&p2p_pgmap->ref);
pgmap_free:
devm_kfree(&pdev->dev, p2p_pgmap);
return error;
diff --git a/include/linux/memremap.h b/include/linux/memremap.h
index 7601ee314c4a..1732dea030b2 100644
--- a/include/linux/memremap.h
+++ b/include/linux/memremap.h
@@ -81,6 +81,7 @@ typedef void (*dev_page_free_t)(struct page *page, void *data);
* @res: physical address range covered by @ref
* @ref: reference count that pins the devm_memremap_pages() mapping
* @kill: callback to transition @ref to the dead state
+ * @cleanup: callback to wait for @ref to be idle and reap it
* @dev: host device of the mapping for debug
* @data: private data pointer for page_free()
* @type: memory type: see MEMORY_* in memory_hotplug.h
@@ -92,6 +93,7 @@ struct dev_pagemap {
struct resource res;
struct percpu_ref *ref;
void (*kill)(struct percpu_ref *ref);
+ void (*cleanup)(struct percpu_ref *ref);
struct device *dev;
void *data;
enum memory_type type;
diff --git a/kernel/memremap.c b/kernel/memremap.c
index 65afbacab44e..05d1af5a2f15 100644
--- a/kernel/memremap.c
+++ b/kernel/memremap.c
@@ -96,6 +96,7 @@ static void devm_memremap_pages_release(void *data)
pgmap->kill(pgmap->ref);
for_each_device_pfn(pfn, pgmap)
put_page(pfn_to_page(pfn));
+ pgmap->cleanup(pgmap->ref);

/* pages are dead and unused, undo the arch mapping */
align_start = res->start & ~(SECTION_SIZE - 1);
@@ -134,8 +135,8 @@ static void devm_memremap_pages_release(void *data)
* 2/ The altmap field may optionally be initialized, in which case altmap_valid
* must be set to true
*
- * 3/ pgmap->ref must be 'live' on entry and will be killed at
- * devm_memremap_pages_release() time, or if this routine fails.
+ * 3/ pgmap->ref must be 'live' on entry and will be killed and reaped
+ * at devm_memremap_pages_release() time, or if this routine fails.
*
* 4/ res is expected to be a host memory range that could feasibly be
* treated as a "System RAM" range, i.e. not a device mmio range, but
@@ -151,8 +152,10 @@ void *devm_memremap_pages(struct device *dev, struct dev_pagemap *pgmap)
pgprot_t pgprot = PAGE_KERNEL;
int error, nid, is_ram;

- if (!pgmap->ref || !pgmap->kill)
+ if (!pgmap->ref || !pgmap->kill || !pgmap->cleanup) {
+ WARN(1, "Missing reference count teardown definition\n");
return ERR_PTR(-EINVAL);
+ }

align_start = res->start & ~(SECTION_SIZE - 1);
align_size = ALIGN(res->start + resource_size(res), SECTION_SIZE)
@@ -163,14 +166,16 @@ void *devm_memremap_pages(struct device *dev, struct dev_pagemap *pgmap)
if (conflict_pgmap) {
dev_WARN(dev, "Conflicting mapping in same section\n");
put_dev_pagemap(conflict_pgmap);
- return ERR_PTR(-ENOMEM);
+ error = -ENOMEM;
+ goto err_array;
}

conflict_pgmap = get_dev_pagemap(PHYS_PFN(align_end), NULL);
if (conflict_pgmap) {
dev_WARN(dev, "Conflicting mapping in same section\n");
put_dev_pagemap(conflict_pgmap);
- return ERR_PTR(-ENOMEM);
+ error = -ENOMEM;
+ goto err_array;
}

is_ram = region_intersects(align_start, align_size,
@@ -262,6 +267,8 @@ void *devm_memremap_pages(struct device *dev, struct dev_pagemap *pgmap)
pgmap_array_delete(res);
err_array:
pgmap->kill(pgmap->ref);
+ pgmap->cleanup(pgmap->ref);
+
return ERR_PTR(error);
}
EXPORT_SYMBOL_GPL(devm_memremap_pages);
diff --git a/mm/hmm.c b/mm/hmm.c
index fe1cd87e49ac..225ade644058 100644
--- a/mm/hmm.c
+++ b/mm/hmm.c
@@ -975,9 +975,8 @@ static void hmm_devmem_ref_release(struct percpu_ref *ref)
complete(&devmem->completion);
}

-static void hmm_devmem_ref_exit(void *data)
+static void hmm_devmem_ref_exit(struct percpu_ref *ref)
{
- struct percpu_ref *ref = data;
struct hmm_devmem *devmem;

devmem = container_of(ref, struct hmm_devmem, ref);
@@ -1054,10 +1053,6 @@ struct hmm_devmem *hmm_devmem_add(const struct hmm_devmem_ops *ops,
if (ret)
return ERR_PTR(ret);

- ret = devm_add_action_or_reset(device, hmm_devmem_ref_exit, &devmem->ref);
- if (ret)
- return ERR_PTR(ret);
-
size = ALIGN(size, PA_SECTION_SIZE);
addr = min((unsigned long)iomem_resource.end,
(1UL << MAX_PHYSMEM_BITS) - 1);
@@ -1096,6 +1091,7 @@ struct hmm_devmem *hmm_devmem_add(const struct hmm_devmem_ops *ops,
devmem->pagemap.ref = &devmem->ref;
devmem->pagemap.data = devmem;
devmem->pagemap.kill = hmm_devmem_ref_kill;
+ devmem->pagemap.cleanup = hmm_devmem_ref_exit;

result = devm_memremap_pages(devmem->device, &devmem->pagemap);
if (IS_ERR(result))
@@ -1133,11 +1129,6 @@ struct hmm_devmem *hmm_devmem_add_resource(const struct hmm_devmem_ops *ops,
if (ret)
return ERR_PTR(ret);

- ret = devm_add_action_or_reset(device, hmm_devmem_ref_exit,
- &devmem->ref);
- if (ret)
- return ERR_PTR(ret);
-
devmem->pfn_first = devmem->resource->start >> PAGE_SHIFT;
devmem->pfn_last = devmem->pfn_first +
(resource_size(devmem->resource) >> PAGE_SHIFT);
@@ -1150,6 +1141,7 @@ struct hmm_devmem *hmm_devmem_add_resource(const struct hmm_devmem_ops *ops,
devmem->pagemap.ref = &devmem->ref;
devmem->pagemap.data = devmem;
devmem->pagemap.kill = hmm_devmem_ref_kill;
+ devmem->pagemap.cleanup = hmm_devmem_ref_exit;

result = devm_memremap_pages(devmem->device, &devmem->pagemap);
if (IS_ERR(result))
diff --git a/tools/testing/nvdimm/test/iomap.c b/tools/testing/nvdimm/test/iomap.c
index c6635fee27d8..219dd0a1cb08 100644
--- a/tools/testing/nvdimm/test/iomap.c
+++ b/tools/testing/nvdimm/test/iomap.c
@@ -108,7 +108,9 @@ static void nfit_test_kill(void *_pgmap)
{
struct dev_pagemap *pgmap = _pgmap;

+ WARN_ON(!pgmap || !pgmap->ref || !pgmap->kill || !pgmap->cleanup);
pgmap->kill(pgmap->ref);
+ pgmap->cleanup(pgmap->ref);
}

void *__wrap_devm_memremap_pages(struct device *dev, struct dev_pagemap *pgmap)

Next message: Nobuhiro Iwamatsu: "Re: [PATCH 4.19 38/99] net: stmmac: use correct DMA buffer size in the RX descriptor"
Previous message: Dan Williams: "[PATCH v2 5/6] PCI/P2PDMA: Track pgmap references per resource, not globally"
In reply to: Dan Williams: "[PATCH v2 5/6] PCI/P2PDMA: Track pgmap references per resource, not globally"
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