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mm: remove MEMORY_DEVICE_PUBLIC support

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The code hasn't been used since it was added to the tree, and doesn't
appear to actually be usable.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Jason Gunthorpe <jgg@mellanox.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Reviewed-by: Dan Williams <dan.j.williams@intel.com>
Tested-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
This commit is contained in:
Christoph Hellwig 2019-06-13 22:50:49 +02:00 committed by Jason Gunthorpe
parent 07ec38917e
commit 25b2995a35
14 changed files with 22 additions and 186 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
fs/proc/task_mmu.c
View File

@ -1279,7 +1279,7 @@ static pagemap_entry_t pte_to_pagemap_entry(struct pagemapread *pm,
if (pm->show_pfn)
frame = pte_pfn(pte);
flags |= PM_PRESENT;
page = _vm_normal_page(vma, addr, pte, true);
page = vm_normal_page(vma, addr, pte);
if (pte_soft_dirty(pte))
flags |= PM_SOFT_DIRTY;
} else if (is_swap_pte(pte)) {

7
include/linux/hmm.h
View File

@ -584,7 +584,7 @@ static inline void hmm_mm_destroy(struct mm_struct *mm) {}
static inline void hmm_mm_init(struct mm_struct *mm) {}
#endif /* IS_ENABLED(CONFIG_HMM_MIRROR) */
#if IS_ENABLED(CONFIG_DEVICE_PRIVATE) || IS_ENABLED(CONFIG_DEVICE_PUBLIC)
#if IS_ENABLED(CONFIG_DEVICE_PRIVATE)
struct hmm_devmem;
struct page *hmm_vma_alloc_locked_page(struct vm_area_struct *vma,
@ -722,9 +722,6 @@ struct hmm_devmem {
struct hmm_devmem *hmm_devmem_add(const struct hmm_devmem_ops *ops,
struct device *device,
unsigned long size);
struct hmm_devmem *hmm_devmem_add_resource(const struct hmm_devmem_ops *ops,
struct device *device,
struct resource *res);
/*
* hmm_devmem_page_set_drvdata - set per-page driver data field
@ -751,7 +748,7 @@ static inline unsigned long hmm_devmem_page_get_drvdata(const struct page *page)
{
return page->hmm_data;
}
#endif /* CONFIG_DEVICE_PRIVATE || CONFIG_DEVICE_PUBLIC */
#endif /* CONFIG_DEVICE_PRIVATE */
#else /* IS_ENABLED(CONFIG_HMM) */
static inline void hmm_mm_destroy(struct mm_struct *mm) {}
static inline void hmm_mm_init(struct mm_struct *mm) {}

1
include/linux/ioport.h
View File

@ -132,7 +132,6 @@ enum {
IORES_DESC_PERSISTENT_MEMORY = 4,
IORES_DESC_PERSISTENT_MEMORY_LEGACY = 5,
IORES_DESC_DEVICE_PRIVATE_MEMORY = 6,
IORES_DESC_DEVICE_PUBLIC_MEMORY = 7,
};
/* helpers to define resources */

8
include/linux/memremap.h
View File

@ -37,13 +37,6 @@ struct vmem_altmap {
* A more complete discussion of unaddressable memory may be found in
* include/linux/hmm.h and Documentation/vm/hmm.rst.
*
* MEMORY_DEVICE_PUBLIC:
* Device memory that is cache coherent from device and CPU point of view. This
* is use on platform that have an advance system bus (like CAPI or CCIX). A
* driver can hotplug the device memory using ZONE_DEVICE and with that memory
* type. Any page of a process can be migrated to such memory. However no one
* should be allow to pin such memory so that it can always be evicted.
*
* MEMORY_DEVICE_FS_DAX:
* Host memory that has similar access semantics as System RAM i.e. DMA
* coherent and supports page pinning. In support of coordinating page
@ -58,7 +51,6 @@ struct vmem_altmap {
*/
enum memory_type {
MEMORY_DEVICE_PRIVATE = 1,
MEMORY_DEVICE_PUBLIC,
MEMORY_DEVICE_FS_DAX,
MEMORY_DEVICE_PCI_P2PDMA,
};

18
include/linux/mm.h
View File

@ -944,7 +944,6 @@ static inline bool put_devmap_managed_page(struct page *page)
return false;
switch (page->pgmap->type) {
case MEMORY_DEVICE_PRIVATE:
case MEMORY_DEVICE_PUBLIC:
case MEMORY_DEVICE_FS_DAX:
__put_devmap_managed_page(page);
return true;
@ -960,12 +959,6 @@ static inline bool is_device_private_page(const struct page *page)
page->pgmap->type == MEMORY_DEVICE_PRIVATE;
}
static inline bool is_device_public_page(const struct page *page)
{
return is_zone_device_page(page) &&
page->pgmap->type == MEMORY_DEVICE_PUBLIC;
}
#ifdef CONFIG_PCI_P2PDMA
static inline bool is_pci_p2pdma_page(const struct page *page)
{
@ -998,11 +991,6 @@ static inline bool is_device_private_page(const struct page *page)
return false;
}
static inline bool is_device_public_page(const struct page *page)
{
return false;
}
static inline bool is_pci_p2pdma_page(const struct page *page)
{
return false;
@ -1431,10 +1419,8 @@ struct zap_details {
pgoff_t last_index; /* Highest page->index to unmap */
};
struct page *_vm_normal_page(struct vm_area_struct *vma, unsigned long addr,
pte_t pte, bool with_public_device);
#define vm_normal_page(vma, addr, pte) _vm_normal_page(vma, addr, pte, false)
struct page *vm_normal_page(struct vm_area_struct *vma, unsigned long addr,
pte_t pte);
struct page *vm_normal_page_pmd(struct vm_area_struct *vma, unsigned long addr,
pmd_t pmd);

11
mm/Kconfig
View File

@ -718,17 +718,6 @@ config DEVICE_PRIVATE
memory; i.e., memory that is only accessible from the device (or
group of devices). You likely also want to select HMM_MIRROR.
config DEVICE_PUBLIC
bool "Addressable device memory (like GPU memory)"
depends on ARCH_HAS_HMM
select HMM
select DEV_PAGEMAP_OPS
help
Allows creation of struct pages to represent addressable device
memory; i.e., memory that is accessible from both the device and
the CPU
config FRAME_VECTOR
bool

7
mm/gup.c
View File

@ -605,13 +605,6 @@ static int get_gate_page(struct mm_struct *mm, unsigned long address,
if ((gup_flags & FOLL_DUMP) || !is_zero_pfn(pte_pfn(*pte)))
goto unmap;
*page = pte_page(*pte);
/*
* This should never happen (a device public page in the gate
* area).
*/
if (is_device_public_page(*page))
goto unmap;
}
if (unlikely(!try_get_page(*page))) {
ret = -ENOMEM;

54
mm/hmm.c
View File

@ -1331,7 +1331,7 @@ EXPORT_SYMBOL(hmm_range_dma_unmap);
#endif /* IS_ENABLED(CONFIG_HMM_MIRROR) */
#if IS_ENABLED(CONFIG_DEVICE_PRIVATE) || IS_ENABLED(CONFIG_DEVICE_PUBLIC)
#if IS_ENABLED(CONFIG_DEVICE_PRIVATE)
struct page *hmm_vma_alloc_locked_page(struct vm_area_struct *vma,
unsigned long addr)
{
@ -1478,54 +1478,4 @@ struct hmm_devmem *hmm_devmem_add(const struct hmm_devmem_ops *ops,
return devmem;
}
EXPORT_SYMBOL_GPL(hmm_devmem_add);
struct hmm_devmem *hmm_devmem_add_resource(const struct hmm_devmem_ops *ops,
struct device *device,
struct resource *res)
{
struct hmm_devmem *devmem;
void *result;
int ret;
if (res->desc != IORES_DESC_DEVICE_PUBLIC_MEMORY)
return ERR_PTR(-EINVAL);
dev_pagemap_get_ops();
devmem = devm_kzalloc(device, sizeof(*devmem), GFP_KERNEL);
if (!devmem)
return ERR_PTR(-ENOMEM);
init_completion(&devmem->completion);
devmem->pfn_first = -1UL;
devmem->pfn_last = -1UL;
devmem->resource = res;
devmem->device = device;
devmem->ops = ops;
ret = percpu_ref_init(&devmem->ref, &hmm_devmem_ref_release,
0, GFP_KERNEL);
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);
devmem->page_fault = hmm_devmem_fault;
devmem->pagemap.type = MEMORY_DEVICE_PUBLIC;
devmem->pagemap.res = *devmem->resource;
devmem->pagemap.page_free = hmm_devmem_free;
devmem->pagemap.altmap_valid = false;
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))
return result;
return devmem;
}
EXPORT_SYMBOL_GPL(hmm_devmem_add_resource);
#endif /* CONFIG_DEVICE_PRIVATE || CONFIG_DEVICE_PUBLIC */
#endif /* CONFIG_DEVICE_PRIVATE */

2
mm/madvise.c
View File

@ -354,7 +354,7 @@ static int madvise_free_pte_range(pmd_t *pmd, unsigned long addr,
continue;
}
page = _vm_normal_page(vma, addr, ptent, true);
page = vm_normal_page(vma, addr, ptent);
if (!page)
continue;

13
mm/memcontrol.c
View File

@ -4793,7 +4793,7 @@ enum mc_target_type {
static struct page *mc_handle_present_pte(struct vm_area_struct *vma,
unsigned long addr, pte_t ptent)
{
struct page *page = _vm_normal_page(vma, addr, ptent, true);
struct page *page = vm_normal_page(vma, addr, ptent);
if (!page || !page_mapped(page))
return NULL;
@ -4994,8 +4994,8 @@ out:
* 2(MC_TARGET_SWAP): if the swap entry corresponding to this pte is a
* target for charge migration. if @target is not NULL, the entry is stored
* in target->ent.
* 3(MC_TARGET_DEVICE): like MC_TARGET_PAGE but page is MEMORY_DEVICE_PUBLIC
* or MEMORY_DEVICE_PRIVATE (so ZONE_DEVICE page and thus not on the lru).
* 3(MC_TARGET_DEVICE): like MC_TARGET_PAGE but page is MEMORY_DEVICE_PRIVATE
* (so ZONE_DEVICE page and thus not on the lru).
* For now we such page is charge like a regular page would be as for all
* intent and purposes it is just special memory taking the place of a
* regular page.
@ -5029,8 +5029,7 @@ static enum mc_target_type get_mctgt_type(struct vm_area_struct *vma,
*/
if (page->mem_cgroup == mc.from) {
ret = MC_TARGET_PAGE;
if (is_device_private_page(page) ||
is_device_public_page(page))
if (is_device_private_page(page))
ret = MC_TARGET_DEVICE;
if (target)
target->page = page;
@ -5101,8 +5100,8 @@ static int mem_cgroup_count_precharge_pte_range(pmd_t *pmd,
if (ptl) {
/*
* Note their can not be MC_TARGET_DEVICE for now as we do not
* support transparent huge page with MEMORY_DEVICE_PUBLIC or
* MEMORY_DEVICE_PRIVATE but this might change.
* support transparent huge page with MEMORY_DEVICE_PRIVATE but
* this might change.
*/
if (get_mctgt_type_thp(vma, addr, *pmd, NULL) == MC_TARGET_PAGE)
mc.precharge += HPAGE_PMD_NR;

6
mm/memory-failure.c
View File

@ -1177,16 +1177,12 @@ static int memory_failure_dev_pagemap(unsigned long pfn, int flags,
goto unlock;
}
switch (pgmap->type) {
case MEMORY_DEVICE_PRIVATE:
case MEMORY_DEVICE_PUBLIC:
if (pgmap->type == MEMORY_DEVICE_PRIVATE) {
/*
* TODO: Handle HMM pages which may need coordination
* with device-side memory.
*/
goto unlock;
default:
break;
}
/*

40
mm/memory.c
View File

@ -571,8 +571,8 @@ static void print_bad_pte(struct vm_area_struct *vma, unsigned long addr,
* PFNMAP mappings in order to support COWable mappings.
*
*/
struct page *_vm_normal_page(struct vm_area_struct *vma, unsigned long addr,
pte_t pte, bool with_public_device)
struct page *vm_normal_page(struct vm_area_struct *vma, unsigned long addr,
pte_t pte)
{
unsigned long pfn = pte_pfn(pte);
@ -585,29 +585,6 @@ struct page *_vm_normal_page(struct vm_area_struct *vma, unsigned long addr,
return NULL;
if (is_zero_pfn(pfn))
return NULL;
/*
* Device public pages are special pages (they are ZONE_DEVICE
* pages but different from persistent memory). They behave
* allmost like normal pages. The difference is that they are
* not on the lru and thus should never be involve with any-
* thing that involve lru manipulation (mlock, numa balancing,
* ...).
*
* This is why we still want to return NULL for such page from
* vm_normal_page() so that we do not have to special case all
* call site of vm_normal_page().
*/
if (likely(pfn <= highest_memmap_pfn)) {
struct page *page = pfn_to_page(pfn);
if (is_device_public_page(page)) {
if (with_public_device)
return page;
return NULL;
}
}
if (pte_devmap(pte))
return NULL;
@ -797,17 +774,6 @@ copy_one_pte(struct mm_struct *dst_mm, struct mm_struct *src_mm,
rss[mm_counter(page)]++;
} else if (pte_devmap(pte)) {
page = pte_page(pte);
/*
* Cache coherent device memory behave like regular page and
* not like persistent memory page. For more informations see
* MEMORY_DEVICE_CACHE_COHERENT in memory_hotplug.h
*/
if (is_device_public_page(page)) {
get_page(page);
page_dup_rmap(page, false);
rss[mm_counter(page)]++;
}
}
out_set_pte:
@ -1063,7 +1029,7 @@ again:
if (pte_present(ptent)) {
struct page *page;
page = _vm_normal_page(vma, addr, ptent, true);
page = vm_normal_page(vma, addr, ptent);
if (unlikely(details) && page) {
/*
* unmap_shared_mapping_pages() wants to

28
mm/migrate.c
View File

@ -246,8 +246,6 @@ static bool remove_migration_pte(struct page *page, struct vm_area_struct *vma,
if (is_device_private_page(new)) {
entry = make_device_private_entry(new, pte_write(pte));
pte = swp_entry_to_pte(entry);
} else if (is_device_public_page(new)) {
pte = pte_mkdevmap(pte);
}
}
@ -381,7 +379,6 @@ static int expected_page_refs(struct address_space *mapping, struct page *page)
* ZONE_DEVICE pages.
*/
expected_count += is_device_private_page(page);
expected_count += is_device_public_page(page);
if (mapping)
expected_count += hpage_nr_pages(page) + page_has_private(page);
@ -994,10 +991,7 @@ static int move_to_new_page(struct page *newpage, struct page *page,
if (!PageMappingFlags(page))
page->mapping = NULL;
if (unlikely(is_zone_device_page(newpage))) {
if (is_device_public_page(newpage))
flush_dcache_page(newpage);
} else
if (likely(!is_zone_device_page(newpage)))
flush_dcache_page(newpage);
}
@ -2265,7 +2259,7 @@ again:
pfn = 0;
goto next;
}
page = _vm_normal_page(migrate->vma, addr, pte, true);
page = vm_normal_page(migrate->vma, addr, pte);
mpfn = migrate_pfn(pfn) | MIGRATE_PFN_MIGRATE;
mpfn |= pte_write(pte) ? MIGRATE_PFN_WRITE : 0;
}
@ -2406,16 +2400,7 @@ static bool migrate_vma_check_page(struct page *page)
* FIXME proper solution is to rework migration_entry_wait() so
* it does not need to take a reference on page.
*/
if (is_device_private_page(page))
return true;
/*
* Only allow device public page to be migrated and account for
* the extra reference count imply by ZONE_DEVICE pages.
*/
if (!is_device_public_page(page))
return false;
extra++;
return is_device_private_page(page);
}
/* For file back page */
@ -2665,11 +2650,6 @@ static void migrate_vma_insert_page(struct migrate_vma *migrate,
swp_entry = make_device_private_entry(page, vma->vm_flags & VM_WRITE);
entry = swp_entry_to_pte(swp_entry);
} else if (is_device_public_page(page)) {
entry = pte_mkold(mk_pte(page, READ_ONCE(vma->vm_page_prot)));
if (vma->vm_flags & VM_WRITE)
entry = pte_mkwrite(pte_mkdirty(entry));
entry = pte_mkdevmap(entry);
}
} else {
entry = mk_pte(page, vma->vm_page_prot);
@ -2789,7 +2769,7 @@ static void migrate_vma_pages(struct migrate_vma *migrate)
migrate->src[i] &= ~MIGRATE_PFN_MIGRATE;
continue;
}
} else if (!is_device_public_page(newpage)) {
} else {
/*
* Other types of ZONE_DEVICE page are not
* supported.

11
mm/swap.c
View File

@ -740,17 +740,6 @@ void release_pages(struct page **pages, int nr)
if (is_huge_zero_page(page))
continue;
/* Device public page can not be huge page */
if (is_device_public_page(page)) {
if (locked_pgdat) {
spin_unlock_irqrestore(&locked_pgdat->lru_lock,
flags);
locked_pgdat = NULL;
}
put_devmap_managed_page(page);
continue;
}
page = compound_head(page);
if (!put_page_testzero(page))
continue;