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Date: Fri, 28 Jun 2019 10:14:43 +0530
From: Anshuman Khandual <anshuman.khandual@....com>
To: linux-mm@...ck.org
Cc: Anshuman Khandual <anshuman.khandual@....com>,
Catalin Marinas <catalin.marinas@....com>,
Will Deacon <will.deacon@....com>,
Mark Rutland <mark.rutland@....com>,
linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: [RFC 2/2] arm64/mm: Enable device memory allocation and free for vmemmap mapping
This enables vmemmap_populate() and vmemmap_free() functions to incorporate
struct vmem_altmap based device memory allocation and free requests. With
this device memory with specific atlmap configuration can be hot plugged
and hot removed as ZONE_DEVICE memory on arm64 platforms.
Cc: Catalin Marinas <catalin.marinas@....com>
Cc: Will Deacon <will.deacon@....com>
Cc: Mark Rutland <mark.rutland@....com>
Cc: linux-arm-kernel@...ts.infradead.org
Cc: linux-kernel@...r.kernel.org
Signed-off-by: Anshuman Khandual <anshuman.khandual@....com>
---
arch/arm64/mm/mmu.c | 57 ++++++++++++++++++++++++++++++++++-------------------
1 file changed, 37 insertions(+), 20 deletions(-)
diff --git a/arch/arm64/mm/mmu.c b/arch/arm64/mm/mmu.c
index 39e18d1..8867bbd 100644
--- a/arch/arm64/mm/mmu.c
+++ b/arch/arm64/mm/mmu.c
@@ -735,15 +735,26 @@ int kern_addr_valid(unsigned long addr)
}
#ifdef CONFIG_MEMORY_HOTPLUG
-static void free_hotplug_page_range(struct page *page, size_t size)
+static void free_hotplug_page_range(struct page *page, size_t size,
+ struct vmem_altmap *altmap)
{
- WARN_ON(!page || PageReserved(page));
- free_pages((unsigned long)page_address(page), get_order(size));
+ if (altmap) {
+ /*
+ * vmemmap_populate() creates vmemmap mapping either at pte
+ * or pmd level. Unmapping request at any other level would
+ * be a problem.
+ */
+ WARN_ON((size != PAGE_SIZE) && (size != PMD_SIZE));
+ vmem_altmap_free(altmap, size >> PAGE_SHIFT);
+ } else {
+ WARN_ON(!page || PageReserved(page));
+ free_pages((unsigned long)page_address(page), get_order(size));
+ }
}
static void free_hotplug_pgtable_page(struct page *page)
{
- free_hotplug_page_range(page, PAGE_SIZE);
+ free_hotplug_page_range(page, PAGE_SIZE, NULL);
}
static void free_pte_table(pmd_t *pmdp, unsigned long addr)
@@ -807,7 +818,8 @@ static void free_pud_table(pgd_t *pgdp, unsigned long addr)
}
static void unmap_hotplug_pte_range(pmd_t *pmdp, unsigned long addr,
- unsigned long end, bool sparse_vmap)
+ unsigned long end, bool sparse_vmap,
+ struct vmem_altmap *altmap)
{
struct page *page;
pte_t *ptep, pte;
@@ -823,12 +835,13 @@ static void unmap_hotplug_pte_range(pmd_t *pmdp, unsigned long addr,
pte_clear(&init_mm, addr, ptep);
flush_tlb_kernel_range(addr, addr + PAGE_SIZE);
if (sparse_vmap)
- free_hotplug_page_range(page, PAGE_SIZE);
+ free_hotplug_page_range(page, PAGE_SIZE, altmap);
} while (addr += PAGE_SIZE, addr < end);
}
static void unmap_hotplug_pmd_range(pud_t *pudp, unsigned long addr,
- unsigned long end, bool sparse_vmap)
+ unsigned long end, bool sparse_vmap,
+ struct vmem_altmap *altmap)
{
unsigned long next;
struct page *page;
@@ -847,16 +860,17 @@ static void unmap_hotplug_pmd_range(pud_t *pudp, unsigned long addr,
pmd_clear(pmdp);
flush_tlb_kernel_range(addr, next);
if (sparse_vmap)
- free_hotplug_page_range(page, PMD_SIZE);
+ free_hotplug_page_range(page, PMD_SIZE, altmap);
continue;
}
WARN_ON(!pmd_table(pmd));
- unmap_hotplug_pte_range(pmdp, addr, next, sparse_vmap);
+ unmap_hotplug_pte_range(pmdp, addr, next, sparse_vmap, altmap);
} while (addr = next, addr < end);
}
static void unmap_hotplug_pud_range(pgd_t *pgdp, unsigned long addr,
- unsigned long end, bool sparse_vmap)
+ unsigned long end, bool sparse_vmap,
+ struct vmem_altmap *altmap)
{
unsigned long next;
struct page *page;
@@ -875,16 +889,16 @@ static void unmap_hotplug_pud_range(pgd_t *pgdp, unsigned long addr,
pud_clear(pudp);
flush_tlb_kernel_range(addr, next);
if (sparse_vmap)
- free_hotplug_page_range(page, PUD_SIZE);
+ free_hotplug_page_range(page, PUD_SIZE, altmap);
continue;
}
WARN_ON(!pud_table(pud));
- unmap_hotplug_pmd_range(pudp, addr, next, sparse_vmap);
+ unmap_hotplug_pmd_range(pudp, addr, next, sparse_vmap, altmap);
} while (addr = next, addr < end);
}
static void unmap_hotplug_range(unsigned long addr, unsigned long end,
- bool sparse_vmap)
+ bool sparse_vmap, struct vmem_altmap *altmap)
{
unsigned long next;
pgd_t *pgdp, pgd;
@@ -897,7 +911,7 @@ static void unmap_hotplug_range(unsigned long addr, unsigned long end,
continue;
WARN_ON(!pgd_present(pgd));
- unmap_hotplug_pud_range(pgdp, addr, next, sparse_vmap);
+ unmap_hotplug_pud_range(pgdp, addr, next, sparse_vmap, altmap);
} while (addr = next, addr < end);
}
@@ -970,9 +984,9 @@ static void free_empty_tables(unsigned long addr, unsigned long end)
}
static void remove_pagetable(unsigned long start, unsigned long end,
- bool sparse_vmap)
+ bool sparse_vmap, struct vmem_altmap *altmap)
{
- unmap_hotplug_range(start, end, sparse_vmap);
+ unmap_hotplug_range(start, end, sparse_vmap, altmap);
free_empty_tables(start, end);
}
#endif
@@ -982,7 +996,7 @@ static void remove_pagetable(unsigned long start, unsigned long end,
int __meminit vmemmap_populate(unsigned long start, unsigned long end, int node,
struct vmem_altmap *altmap)
{
- return vmemmap_populate_basepages(start, end, node, NULL);
+ return vmemmap_populate_basepages(start, end, node, altmap);
}
#else /* !ARM64_SWAPPER_USES_SECTION_MAPS */
int __meminit vmemmap_populate(unsigned long start, unsigned long end, int node,
@@ -1009,7 +1023,10 @@ int __meminit vmemmap_populate(unsigned long start, unsigned long end, int node,
if (pmd_none(READ_ONCE(*pmdp))) {
void *p = NULL;
- p = vmemmap_alloc_block_buf(PMD_SIZE, node);
+ if (altmap)
+ p = altmap_alloc_block_buf(PMD_SIZE, altmap);
+ else
+ p = vmemmap_alloc_block_buf(PMD_SIZE, node);
if (!p)
return -ENOMEM;
@@ -1043,7 +1060,7 @@ void vmemmap_free(unsigned long start, unsigned long end,
* given vmemmap range being hot-removed. Just unmap and free the
* range instead.
*/
- unmap_hotplug_range(start, end, true);
+ unmap_hotplug_range(start, end, true, altmap);
#endif
}
#endif /* CONFIG_SPARSEMEM_VMEMMAP */
@@ -1336,7 +1353,7 @@ static void __remove_pgd_mapping(pgd_t *pgdir, unsigned long start, u64 size)
unsigned long end = start + size;
WARN_ON(pgdir != init_mm.pgd);
- remove_pagetable(start, end, false);
+ remove_pagetable(start, end, false, NULL);
}
int arch_add_memory(int nid, u64 start, u64 size,
--
2.7.4
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