[PATCH 2/2] mm, memory_hotplug: provide a more generic restrictions for memory hotplug

From: Oscar Salvador
Date: Thu Apr 04 2019 - 08:59:45 EST

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From: Michal Hocko <mhocko@xxxxxxxx>

arch_add_memory, __add_pages take a want_memblock which controls whether
the newly added memory should get the sysfs memblock user API (e.g.
ZONE_DEVICE users do not want/need this interface). Some callers even
want to control where do we allocate the memmap from by configuring
altmap.

Add a more generic hotplug context for arch_add_memory and __add_pages.
struct mhp_restrictions contains flags which contains additional
features to be enabled by the memory hotplug (MHP_MEMBLOCK_API
currently) and altmap for alternative memmap allocator.

This patch shouldn't introduce any functional change.

Signed-off-by: Michal Hocko <mhocko@xxxxxxxx>
Signed-off-by: Oscar Salvador <osalvador@xxxxxxx>
---
arch/arm64/mm/mmu.c | 6 +++---
arch/ia64/mm/init.c | 6 +++---
arch/powerpc/mm/mem.c | 6 +++---
arch/s390/mm/init.c | 6 +++---
arch/sh/mm/init.c | 6 +++---
arch/x86/mm/init_32.c | 6 +++---
arch/x86/mm/init_64.c | 10 +++++-----
include/linux/memory_hotplug.h | 29 +++++++++++++++++++++++------
kernel/memremap.c | 10 +++++++---
mm/memory_hotplug.c | 10 ++++++----
10 files changed, 59 insertions(+), 36 deletions(-)

diff --git a/arch/arm64/mm/mmu.c b/arch/arm64/mm/mmu.c
index e6acfa7be4c7..db509550329d 100644
--- a/arch/arm64/mm/mmu.c
+++ b/arch/arm64/mm/mmu.c
@@ -1046,8 +1046,8 @@ int p4d_free_pud_page(p4d_t *p4d, unsigned long addr)
}

#ifdef CONFIG_MEMORY_HOTPLUG
-int arch_add_memory(int nid, u64 start, u64 size, struct vmem_altmap *altmap,
- bool want_memblock)
+int arch_add_memory(int nid, u64 start, u64 size,
+ struct mhp_restrictions *restrictions)
{
int flags = 0;

@@ -1058,6 +1058,6 @@ int arch_add_memory(int nid, u64 start, u64 size, struct vmem_altmap *altmap,
size, PAGE_KERNEL, pgd_pgtable_alloc, flags);

return __add_pages(nid, start >> PAGE_SHIFT, size >> PAGE_SHIFT,
- altmap, want_memblock);
+ restrictions);
}
#endif
diff --git a/arch/ia64/mm/init.c b/arch/ia64/mm/init.c
index e49200e31750..379eb1f9adc9 100644
--- a/arch/ia64/mm/init.c
+++ b/arch/ia64/mm/init.c
@@ -666,14 +666,14 @@ mem_init (void)
}

#ifdef CONFIG_MEMORY_HOTPLUG
-int arch_add_memory(int nid, u64 start, u64 size, struct vmem_altmap *altmap,
- bool want_memblock)
+int arch_add_memory(int nid, u64 start, u64 size,
+ struct mhp_restrictions *restrictions)
{
unsigned long start_pfn = start >> PAGE_SHIFT;
unsigned long nr_pages = size >> PAGE_SHIFT;
int ret;

- ret = __add_pages(nid, start_pfn, nr_pages, altmap, want_memblock);
+ ret = __add_pages(nid, start_pfn, nr_pages, restrictions);
if (ret)
printk("%s: Problem encountered in __add_pages() as ret=%d\n",
__func__, ret);
diff --git a/arch/powerpc/mm/mem.c b/arch/powerpc/mm/mem.c
index 1aa27aac73c5..76deaa8525db 100644
--- a/arch/powerpc/mm/mem.c
+++ b/arch/powerpc/mm/mem.c
@@ -109,8 +109,8 @@ int __weak remove_section_mapping(unsigned long start, unsigned long end)
return -ENODEV;
}

-int __meminit arch_add_memory(int nid, u64 start, u64 size, struct vmem_altmap *altmap,
- bool want_memblock)
+int __meminit arch_add_memory(int nid, u64 start, u64 size,
+ struct mhp_restrictions *restrictions)
{
unsigned long start_pfn = start >> PAGE_SHIFT;
unsigned long nr_pages = size >> PAGE_SHIFT;
@@ -127,7 +127,7 @@ int __meminit arch_add_memory(int nid, u64 start, u64 size, struct vmem_altmap *
}
flush_inval_dcache_range(start, start + size);

- return __add_pages(nid, start_pfn, nr_pages, altmap, want_memblock);
+ return __add_pages(nid, start_pfn, nr_pages, restrictions);
}

#ifdef CONFIG_MEMORY_HOTREMOVE
diff --git a/arch/s390/mm/init.c b/arch/s390/mm/init.c
index 25e3113091ea..f5db961ad792 100644
--- a/arch/s390/mm/init.c
+++ b/arch/s390/mm/init.c
@@ -216,8 +216,8 @@ device_initcall(s390_cma_mem_init);

#endif /* CONFIG_CMA */

-int arch_add_memory(int nid, u64 start, u64 size, struct vmem_altmap *altmap,
- bool want_memblock)
+int arch_add_memory(int nid, u64 start, u64 size,
+ struct mhp_restrictions *restrictions)
{
unsigned long start_pfn = PFN_DOWN(start);
unsigned long size_pages = PFN_DOWN(size);
@@ -227,7 +227,7 @@ int arch_add_memory(int nid, u64 start, u64 size, struct vmem_altmap *altmap,
if (rc)
return rc;

- rc = __add_pages(nid, start_pfn, size_pages, altmap, want_memblock);
+ rc = __add_pages(nid, start_pfn, size_pages, restrictions);
if (rc)
vmem_remove_mapping(start, size);
return rc;
diff --git a/arch/sh/mm/init.c b/arch/sh/mm/init.c
index 8e004b2f1a6a..168d3a6b9358 100644
--- a/arch/sh/mm/init.c
+++ b/arch/sh/mm/init.c
@@ -404,15 +404,15 @@ void __init mem_init(void)
}

#ifdef CONFIG_MEMORY_HOTPLUG
-int arch_add_memory(int nid, u64 start, u64 size, struct vmem_altmap *altmap,
- bool want_memblock)
+int arch_add_memory(int nid, u64 start, u64 size,
+ struct mhp_restrictions *restrictions)
{
unsigned long start_pfn = PFN_DOWN(start);
unsigned long nr_pages = size >> PAGE_SHIFT;
int ret;

/* We only have ZONE_NORMAL, so this is easy.. */
- ret = __add_pages(nid, start_pfn, nr_pages, altmap, want_memblock);
+ ret = __add_pages(nid, start_pfn, nr_pages, restrictions);
if (unlikely(ret))
printk("%s: Failed, __add_pages() == %d\n", __func__, ret);

diff --git a/arch/x86/mm/init_32.c b/arch/x86/mm/init_32.c
index 85c94f9a87f8..755dbed85531 100644
--- a/arch/x86/mm/init_32.c
+++ b/arch/x86/mm/init_32.c
@@ -850,13 +850,13 @@ void __init mem_init(void)
}

#ifdef CONFIG_MEMORY_HOTPLUG
-int arch_add_memory(int nid, u64 start, u64 size, struct vmem_altmap *altmap,
- bool want_memblock)
+int arch_add_memory(int nid, u64 start, u64 size,
+ struct mhp_restrictions *restrictions)
{
unsigned long start_pfn = start >> PAGE_SHIFT;
unsigned long nr_pages = size >> PAGE_SHIFT;

- return __add_pages(nid, start_pfn, nr_pages, altmap, want_memblock);
+ return __add_pages(nid, start_pfn, nr_pages, restrictions);
}

#ifdef CONFIG_MEMORY_HOTREMOVE
diff --git a/arch/x86/mm/init_64.c b/arch/x86/mm/init_64.c
index bccff68e3267..db42c11b48fb 100644
--- a/arch/x86/mm/init_64.c
+++ b/arch/x86/mm/init_64.c
@@ -777,11 +777,11 @@ static void update_end_of_memory_vars(u64 start, u64 size)
}

int add_pages(int nid, unsigned long start_pfn, unsigned long nr_pages,
- struct vmem_altmap *altmap, bool want_memblock)
+ struct mhp_restrictions *restrictions)
{
int ret;

- ret = __add_pages(nid, start_pfn, nr_pages, altmap, want_memblock);
+ ret = __add_pages(nid, start_pfn, nr_pages, restrictions);
WARN_ON_ONCE(ret);

/* update max_pfn, max_low_pfn and high_memory */
@@ -791,15 +791,15 @@ int add_pages(int nid, unsigned long start_pfn, unsigned long nr_pages,
return ret;
}

-int arch_add_memory(int nid, u64 start, u64 size, struct vmem_altmap *altmap,
- bool want_memblock)
+int arch_add_memory(int nid, u64 start, u64 size,
+ struct mhp_restrictions *restrictions)
{
unsigned long start_pfn = start >> PAGE_SHIFT;
unsigned long nr_pages = size >> PAGE_SHIFT;

init_memory_mapping(start, start + size);

- return add_pages(nid, start_pfn, nr_pages, altmap, want_memblock);
+ return add_pages(nid, start_pfn, nr_pages, restrictions);
}

#define PAGE_INUSE 0xFD
diff --git a/include/linux/memory_hotplug.h b/include/linux/memory_hotplug.h
index 3c8cf347804c..5bd4b56f639c 100644
--- a/include/linux/memory_hotplug.h
+++ b/include/linux/memory_hotplug.h
@@ -118,20 +118,37 @@ extern int __remove_pages(struct zone *zone, unsigned long start_pfn,
unsigned long nr_pages, struct vmem_altmap *altmap);
#endif /* CONFIG_MEMORY_HOTREMOVE */

+/*
+ * Do we want sysfs memblock files created. This will allow userspace to online
+ * and offline memory explicitly. Lack of this bit means that the caller has to
+ * call move_pfn_range_to_zone to finish the initialization.
+ */
+
+#define MHP_MEMBLOCK_API (1<<0)
+
+/*
+ * Restrictions for the memory hotplug:
+ * flags: MHP_ flags
+ * altmap: alternative allocator for memmap array
+ */
+struct mhp_restrictions {
+ unsigned long flags;
+ struct vmem_altmap *altmap;
+};
+
/* reasonably generic interface to expand the physical pages */
extern int __add_pages(int nid, unsigned long start_pfn, unsigned long nr_pages,
- struct vmem_altmap *altmap, bool want_memblock);
+ struct mhp_restrictions *restrictions);

#ifndef CONFIG_ARCH_HAS_ADD_PAGES
static inline int add_pages(int nid, unsigned long start_pfn,
- unsigned long nr_pages, struct vmem_altmap *altmap,
- bool want_memblock)
+ unsigned long nr_pages, struct mhp_restrictions *restrictions)
{
- return __add_pages(nid, start_pfn, nr_pages, altmap, want_memblock);
+ return __add_pages(nid, start_pfn, nr_pages, restrictions);
}
#else /* ARCH_HAS_ADD_PAGES */
int add_pages(int nid, unsigned long start_pfn, unsigned long nr_pages,
- struct vmem_altmap *altmap, bool want_memblock);
+ struct mhp_restrictions *restrictions);
#endif /* ARCH_HAS_ADD_PAGES */

#ifdef CONFIG_NUMA
@@ -333,7 +350,7 @@ extern int __add_memory(int nid, u64 start, u64 size);
extern int add_memory(int nid, u64 start, u64 size);
extern int add_memory_resource(int nid, struct resource *resource);
extern int arch_add_memory(int nid, u64 start, u64 size,
- struct vmem_altmap *altmap, bool want_memblock);
+ struct mhp_restrictions *restrictions);
extern void move_pfn_range_to_zone(struct zone *zone, unsigned long start_pfn,
unsigned long nr_pages, struct vmem_altmap *altmap);
extern bool is_memblock_offlined(struct memory_block *mem);
diff --git a/kernel/memremap.c b/kernel/memremap.c
index a856cb5ff192..cc5e3e34417d 100644
--- a/kernel/memremap.c
+++ b/kernel/memremap.c
@@ -149,6 +149,7 @@ void *devm_memremap_pages(struct device *dev, struct dev_pagemap *pgmap)
struct resource *res = &pgmap->res;
struct dev_pagemap *conflict_pgmap;
pgprot_t pgprot = PAGE_KERNEL;
+ struct mhp_restrictions restrictions = {};
int error, nid, is_ram;

if (!pgmap->ref || !pgmap->kill)
@@ -199,6 +200,9 @@ void *devm_memremap_pages(struct device *dev, struct dev_pagemap *pgmap)
if (error)
goto err_pfn_remap;

+ /* We do not want any optional features only our own memmap */
+ restrictions.altmap = altmap;
+
mem_hotplug_begin();

/*
@@ -214,7 +218,7 @@ void *devm_memremap_pages(struct device *dev, struct dev_pagemap *pgmap)
*/
if (pgmap->type == MEMORY_DEVICE_PRIVATE) {
error = add_pages(nid, align_start >> PAGE_SHIFT,
- align_size >> PAGE_SHIFT, NULL, false);
+ align_size >> PAGE_SHIFT, &restrictions);
} else {
error = kasan_add_zero_shadow(__va(align_start), align_size);
if (error) {
@@ -222,8 +226,8 @@ void *devm_memremap_pages(struct device *dev, struct dev_pagemap *pgmap)
goto err_kasan;
}

- error = arch_add_memory(nid, align_start, align_size, altmap,
- false);
+ error = arch_add_memory(nid, align_start, align_size,
+ &restrictions);
}

if (!error) {
diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index d8a3e9554aec..50f77e059457 100644
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -274,12 +274,12 @@ static int __meminit __add_section(int nid, unsigned long phys_start_pfn,
* add the new pages.
*/
int __ref __add_pages(int nid, unsigned long phys_start_pfn,
- unsigned long nr_pages, struct vmem_altmap *altmap,
- bool want_memblock)
+ unsigned long nr_pages, struct mhp_restrictions *restrictions)
{
unsigned long i;
int err = 0;
int start_sec, end_sec;
+ struct vmem_altmap *altmap = restrictions->altmap;

/* during initialize mem_map, align hot-added range to section */
start_sec = pfn_to_section_nr(phys_start_pfn);
@@ -300,7 +300,7 @@ int __ref __add_pages(int nid, unsigned long phys_start_pfn,

for (i = start_sec; i <= end_sec; i++) {
err = __add_section(nid, section_nr_to_pfn(i), altmap,
- want_memblock);
+ restrictions->flags & MHP_MEMBLOCK_API);

/*
* EEXIST is finally dealt with by ioresource collision
@@ -1102,6 +1102,7 @@ int __ref add_memory_resource(int nid, struct resource *res)
u64 start, size;
bool new_node = false;
int ret;
+ struct mhp_restrictions restrictions = {};

start = res->start;
size = resource_size(res);
@@ -1126,7 +1127,8 @@ int __ref add_memory_resource(int nid, struct resource *res)
new_node = ret;

/* call arch's memory hotadd */
- ret = arch_add_memory(nid, start, size, NULL, true);
+ restrictions.flags = MHP_MEMBLOCK_API;
+ ret = arch_add_memory(nid, start, size, &restrictions);
if (ret < 0)
goto error;

--
2.13.7

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