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[HMM v13 05/18] mm/ZONE_DEVICE/devmem_pages_remove: allow early removal of device memory

From Jérôme Glisse <jglisse@redhat.com>
Newsgroups linux.kernel
Subject [HMM v13 05/18] mm/ZONE_DEVICE/devmem_pages_remove: allow early removal of device memory
Date 2016-11-18 18:30 +0100
Message-ID <sEV98-1Es-13@gated-at.bofh.it> (permalink)
References <sEUZr-1B7-3@gated-at.bofh.it>
Organization linux.* mail to news gateway

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HMM wants to remove device memory early before device tear down so add an
helper to do that.

Signed-off-by: Jérôme Glisse <jglisse@redhat.com>
Cc: Dan Williams <dan.j.williams@intel.com>
Cc: Ross Zwisler <ross.zwisler@linux.intel.com>
---
 include/linux/memremap.h |  7 +++++++
 kernel/memremap.c        | 14 ++++++++++++++
 2 files changed, 21 insertions(+)

diff --git a/include/linux/memremap.h b/include/linux/memremap.h
index 469c88d..b6f03e9 100644
--- a/include/linux/memremap.h
+++ b/include/linux/memremap.h
@@ -60,6 +60,7 @@ void *devm_memremap_pages(struct device *dev, struct resource *res,
 			  struct percpu_ref *ref, struct vmem_altmap *altmap,
 			  struct dev_pagemap **ppgmap, int flags);
 struct dev_pagemap *find_dev_pagemap(resource_size_t phys);
+int devm_memremap_pages_remove(struct device *dev, struct dev_pagemap *pgmap);
 
 static inline bool is_addressable_page(const struct page *page)
 {
@@ -88,6 +89,12 @@ static inline struct dev_pagemap *find_dev_pagemap(resource_size_t phys)
 	return NULL;
 }
 
+static inline int devm_memremap_pages_remove(struct device *dev,
+					     struct dev_pagemap *pgmap)
+{
+	return -EINVAL;
+}
+
 static inline bool is_addressable_page(const struct page *page)
 {
 	return true;
diff --git a/kernel/memremap.c b/kernel/memremap.c
index 3d28048..cf83928 100644
--- a/kernel/memremap.c
+++ b/kernel/memremap.c
@@ -401,6 +401,20 @@ void *devm_memremap_pages(struct device *dev, struct resource *res,
 }
 EXPORT_SYMBOL(devm_memremap_pages);
 
+static int devm_page_map_match(struct device *dev, void *data, void *match_data)
+{
+	struct page_map *page_map = data;
+
+	return &page_map->pgmap == match_data;
+}
+
+int devm_memremap_pages_remove(struct device *dev, struct dev_pagemap *pgmap)
+{
+	return devres_release(dev, &devm_memremap_pages_release,
+			      &devm_page_map_match, pgmap);
+}
+EXPORT_SYMBOL(devm_memremap_pages_remove);
+
 unsigned long vmem_altmap_offset(struct vmem_altmap *altmap)
 {
 	/* number of pfns from base where pfn_to_page() is valid */
-- 
2.4.3

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Thread

[HMM v13 00/18] HMM (Heterogeneous Memory Management) v13 Jérôme Glisse <jglisse@redhat.com> - 2016-11-18 18:20 +0100
  [HMM v13 13/18] mm/hmm/mirror: device page fault handler Jérôme Glisse <jglisse@redhat.com> - 2016-11-18 18:20 +0100
  [HMM v13 12/18] mm/hmm/mirror: helper to snapshot CPU page table Jérôme Glisse <jglisse@redhat.com> - 2016-11-18 18:30 +0100
  [HMM v13 02/18] mm/ZONE_DEVICE/unaddressable: add support for un-addressable device memory Jérôme Glisse <jglisse@redhat.com> - 2016-11-18 18:30 +0100
    Re: [HMM v13 02/18] mm/ZONE_DEVICE/unaddressable: add support for  un-addressable device memory Anshuman Khandual <khandual@linux.vnet.ibm.com> - 2016-11-21 09:10 +0100
      Re: [HMM v13 02/18] mm/ZONE_DEVICE/unaddressable: add support for  un-addressable device memory Jerome Glisse <jglisse@redhat.com> - 2016-11-21 13:40 +0100
        Re: [HMM v13 02/18] mm/ZONE_DEVICE/unaddressable: add support for  un-addressable device memory Anshuman Khandual <khandual@linux.vnet.ibm.com> - 2016-11-22 06:20 +0100
  [HMM v13 09/18] mm/hmm/mirror: mirror process address space on device with HMM helpers Jérôme Glisse <jglisse@redhat.com> - 2016-11-18 18:30 +0100
    Re: [HMM v13 09/18] mm/hmm/mirror: mirror process address space on  device with HMM helpers Balbir Singh <bsingharora@gmail.com> - 2016-11-21 03:50 +0100
      Re: [HMM v13 09/18] mm/hmm/mirror: mirror process address space on  device with HMM helpers Jerome Glisse <jglisse@redhat.com> - 2016-11-21 06:20 +0100
  [HMM v13 05/18] mm/ZONE_DEVICE/devmem_pages_remove: allow early removal of device memory Jérôme Glisse <jglisse@redhat.com> - 2016-11-18 18:30 +0100
    Re: [HMM v13 05/18] mm/ZONE_DEVICE/devmem_pages_remove: allow early  removal of device memory Anshuman Khandual <khandual@linux.vnet.ibm.com> - 2016-11-21 11:40 +0100
      Re: [HMM v13 05/18] mm/ZONE_DEVICE/devmem_pages_remove: allow early  removal of device memory Jerome Glisse <jglisse@redhat.com> - 2016-11-21 13:40 +0100
        Re: [HMM v13 05/18] mm/ZONE_DEVICE/devmem_pages_remove: allow early  removal of device memory Anshuman Khandual <khandual@linux.vnet.ibm.com> - 2016-11-22 06:00 +0100
  [HMM v13 04/18] mm/ZONE_DEVICE/free-page: callback when page is freed Jérôme Glisse <jglisse@redhat.com> - 2016-11-18 18:30 +0100
    Re: [HMM v13 04/18] mm/ZONE_DEVICE/free-page: callback when page is  freed Balbir Singh <bsingharora@gmail.com> - 2016-11-21 03:00 +0100
      Re: [HMM v13 04/18] mm/ZONE_DEVICE/free-page: callback when page is  freed Jerome Glisse <jglisse@redhat.com> - 2016-11-21 06:00 +0100
    Re: [HMM v13 04/18] mm/ZONE_DEVICE/free-page: callback when page is  freed Anshuman Khandual <khandual@linux.vnet.ibm.com> - 2016-11-21 09:30 +0100
      Re: [HMM v13 04/18] mm/ZONE_DEVICE/free-page: callback when page is  freed Jerome Glisse <jglisse@redhat.com> - 2016-11-21 13:40 +0100
        Re: [HMM v13 04/18] mm/ZONE_DEVICE/free-page: callback when page is  freed Anshuman Khandual <khandual@linux.vnet.ibm.com> - 2016-11-22 06:10 +0100
  [HMM v13 10/18] mm/hmm/mirror: add range lock helper, prevent CPU page table update for the range Jérôme Glisse <jglisse@redhat.com> - 2016-11-18 18:30 +0100
  [HMM v13 06/18] mm/ZONE_DEVICE/unaddressable: add special swap for unaddressable Jérôme Glisse <jglisse@redhat.com> - 2016-11-18 18:30 +0100
    Re: [HMM v13 06/18] mm/ZONE_DEVICE/unaddressable: add special swap  for unaddressable Balbir Singh <bsingharora@gmail.com> - 2016-11-21 03:10 +0100
      Re: [HMM v13 06/18] mm/ZONE_DEVICE/unaddressable: add special swap  for unaddressable Jerome Glisse <jglisse@redhat.com> - 2016-11-21 06:10 +0100
        Re: [HMM v13 06/18] mm/ZONE_DEVICE/unaddressable: add special swap  for unaddressable Balbir Singh <bsingharora@gmail.com> - 2016-11-22 03:30 +0100
          Re: [HMM v13 06/18] mm/ZONE_DEVICE/unaddressable: add special swap  for unaddressable Jerome Glisse <jglisse@redhat.com> - 2016-11-22 15:00 +0100
      Re: [HMM v13 06/18] mm/ZONE_DEVICE/unaddressable: add special swap  for unaddressable Anshuman Khandual <khandual@linux.vnet.ibm.com> - 2016-11-21 12:20 +0100
    Re: [HMM v13 06/18] mm/ZONE_DEVICE/unaddressable: add special swap  for unaddressable Anshuman Khandual <khandual@linux.vnet.ibm.com> - 2016-11-21 12:00 +0100
      Re: [HMM v13 06/18] mm/ZONE_DEVICE/unaddressable: add special swap  for unaddressable Jerome Glisse <jglisse@redhat.com> - 2016-11-21 13:50 +0100
        Re: [HMM v13 06/18] mm/ZONE_DEVICE/unaddressable: add special swap  for unaddressable Anshuman Khandual <khandual@linux.vnet.ibm.com> - 2016-11-22 05:50 +0100
          Re: [HMM v13 06/18] mm/ZONE_DEVICE/unaddressable: add special swap  for unaddressable Jerome Glisse <jglisse@redhat.com> - 2016-11-24 15:00 +0100
  [HMM v13 11/18] mm/hmm/mirror: add range monitor helper, to monitor CPU page table update Jérôme Glisse <jglisse@redhat.com> - 2016-11-18 18:30 +0100
  Re: [HMM v13 00/18] HMM (Heterogeneous Memory Management) v13 John Hubbard <jhubbard@nvidia.com> - 2016-11-19 01:50 +0100
    Re: [HMM v13 00/18] HMM (Heterogeneous Memory Management) v13 "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com> - 2016-11-19 16:00 +0100

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