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Message-Id: <20220721130419.1904711-4-chenhuacai@loongson.cn>
Date: Thu, 21 Jul 2022 21:04:18 +0800
From: Huacai Chen <chenhuacai@...ngson.cn>
To: Arnd Bergmann <arnd@...db.de>, Huacai Chen <chenhuacai@...nel.org>,
Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
Dave Hansen <dave.hansen@...ux.intel.com>,
Andy Lutomirski <luto@...nel.org>,
Peter Zijlstra <peterz@...radead.org>,
Catalin Marinas <catalin.marinas@....com>,
Will Deacon <will@...nel.org>
Cc: loongarch@...ts.linux.dev, linux-arch@...r.kernel.org,
Xuefeng Li <lixuefeng@...ngson.cn>,
Guo Ren <guoren@...nel.org>, Xuerui Wang <kernel@...0n.name>,
Jiaxun Yang <jiaxun.yang@...goat.com>,
Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
linux-mips@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-arm-kernel@...ts.infradead.org,
Feiyang Chen <chenfeiyang@...ngson.cn>,
Huacai Chen <chenhuacai@...ngson.cn>
Subject: [PATCH V5 3/4] mm/sparse-vmemmap: Generalise vmemmap_populate_hugepages()
From: Feiyang Chen <chenfeiyang@...ngson.cn>
Generalise vmemmap_populate_hugepages() so ARM64 & X86 & LoongArch can
share its implementation.
Signed-off-by: Feiyang Chen <chenfeiyang@...ngson.cn>
Signed-off-by: Huacai Chen <chenhuacai@...ngson.cn>
---
arch/arm64/mm/mmu.c | 53 ++++++-----------------
arch/loongarch/mm/init.c | 63 ++++++++-------------------
arch/x86/mm/init_64.c | 92 ++++++++++++++--------------------------
include/linux/mm.h | 6 +++
mm/sparse-vmemmap.c | 63 +++++++++++++++++++++++++++
5 files changed, 133 insertions(+), 144 deletions(-)
diff --git a/arch/arm64/mm/mmu.c b/arch/arm64/mm/mmu.c
index 626ec32873c6..be11ba5c93f6 100644
--- a/arch/arm64/mm/mmu.c
+++ b/arch/arm64/mm/mmu.c
@@ -1158,49 +1158,24 @@ int __meminit vmemmap_populate(unsigned long start, unsigned long end, int node,
return vmemmap_populate_basepages(start, end, node, altmap);
}
#else /* !ARM64_KERNEL_USES_PMD_MAPS */
+void __meminit vmemmap_set_pmd(pmd_t *pmdp, void *p, int node,
+ unsigned long addr, unsigned long next)
+{
+ pmd_set_huge(pmdp, __pa(p), __pgprot(PROT_SECT_NORMAL));
+}
+
+int __meminit vmemmap_check_pmd(pmd_t *pmdp, int node, unsigned long addr,
+ unsigned long next)
+{
+ vmemmap_verify((pte_t *)pmdp, node, addr, next);
+ return 1;
+}
+
int __meminit vmemmap_populate(unsigned long start, unsigned long end, int node,
struct vmem_altmap *altmap)
{
- unsigned long addr = start;
- unsigned long next;
- pgd_t *pgdp;
- p4d_t *p4dp;
- pud_t *pudp;
- pmd_t *pmdp;
-
WARN_ON((start < VMEMMAP_START) || (end > VMEMMAP_END));
- do {
- next = pmd_addr_end(addr, end);
-
- pgdp = vmemmap_pgd_populate(addr, node);
- if (!pgdp)
- return -ENOMEM;
-
- p4dp = vmemmap_p4d_populate(pgdp, addr, node);
- if (!p4dp)
- return -ENOMEM;
-
- pudp = vmemmap_pud_populate(p4dp, addr, node);
- if (!pudp)
- return -ENOMEM;
-
- pmdp = pmd_offset(pudp, addr);
- if (pmd_none(READ_ONCE(*pmdp))) {
- void *p = NULL;
-
- p = vmemmap_alloc_block_buf(PMD_SIZE, node, altmap);
- if (!p) {
- if (vmemmap_populate_basepages(addr, next, node, altmap))
- return -ENOMEM;
- continue;
- }
-
- pmd_set_huge(pmdp, __pa(p), __pgprot(PROT_SECT_NORMAL));
- } else
- vmemmap_verify((pte_t *)pmdp, node, addr, next);
- } while (addr = next, addr != end);
-
- return 0;
+ return vmemmap_populate_hugepages(start, end, node, altmap);
}
#endif /* !ARM64_KERNEL_USES_PMD_MAPS */
diff --git a/arch/loongarch/mm/init.c b/arch/loongarch/mm/init.c
index 35128229fe46..3190b3cd52d1 100644
--- a/arch/loongarch/mm/init.c
+++ b/arch/loongarch/mm/init.c
@@ -158,52 +158,25 @@ void arch_remove_memory(u64 start, u64 size, struct vmem_altmap *altmap)
#endif
#ifdef CONFIG_SPARSEMEM_VMEMMAP
-int __meminit vmemmap_populate_hugepages(unsigned long start, unsigned long end,
- int node, struct vmem_altmap *altmap)
+void __meminit vmemmap_set_pmd(pmd_t *pmd, void *p, int node,
+ unsigned long addr, unsigned long next)
{
- unsigned long addr = start;
- unsigned long next;
- pgd_t *pgd;
- p4d_t *p4d;
- pud_t *pud;
- pmd_t *pmd;
-
- for (addr = start; addr < end; addr = next) {
- next = pmd_addr_end(addr, end);
-
- pgd = vmemmap_pgd_populate(addr, node);
- if (!pgd)
- return -ENOMEM;
- p4d = vmemmap_p4d_populate(pgd, addr, node);
- if (!p4d)
- return -ENOMEM;
- pud = vmemmap_pud_populate(p4d, addr, node);
- if (!pud)
- return -ENOMEM;
-
- pmd = pmd_offset(pud, addr);
- if (pmd_none(*pmd)) {
- void *p = NULL;
-
- p = vmemmap_alloc_block_buf(PMD_SIZE, node, NULL);
- if (p) {
- pmd_t entry;
-
- entry = pfn_pmd(virt_to_pfn(p), PAGE_KERNEL);
- pmd_val(entry) |= _PAGE_HUGE | _PAGE_HGLOBAL;
- set_pmd_at(&init_mm, addr, pmd, entry);
-
- continue;
- }
- } else if (pmd_val(*pmd) & _PAGE_HUGE) {
- vmemmap_verify((pte_t *)pmd, node, addr, next);
- continue;
- }
- if (vmemmap_populate_basepages(addr, next, node, NULL))
- return -ENOMEM;
- }
-
- return 0;
+ pmd_t entry;
+
+ entry = pfn_pmd(virt_to_pfn(p), PAGE_KERNEL);
+ pmd_val(entry) |= _PAGE_HUGE | _PAGE_HGLOBAL;
+ set_pmd_at(&init_mm, addr, pmd, entry);
+}
+
+int __meminit vmemmap_check_pmd(pmd_t *pmd, int node, unsigned long addr,
+ unsigned long next)
+{
+ int huge = pmd_val(*pmd) & _PAGE_HUGE;
+
+ if (huge)
+ vmemmap_verify((pte_t *)pmd, node, addr, next);
+
+ return huge;
}
#if CONFIG_PGTABLE_LEVELS == 2
diff --git a/arch/x86/mm/init_64.c b/arch/x86/mm/init_64.c
index 39c5246964a9..4911093ee2f3 100644
--- a/arch/x86/mm/init_64.c
+++ b/arch/x86/mm/init_64.c
@@ -1532,72 +1532,44 @@ static long __meminitdata addr_start, addr_end;
static void __meminitdata *p_start, *p_end;
static int __meminitdata node_start;
-static int __meminit vmemmap_populate_hugepages(unsigned long start,
- unsigned long end, int node, struct vmem_altmap *altmap)
+void __meminit vmemmap_set_pmd(pmd_t *pmd, void *p, int node,
+ unsigned long addr, unsigned long next)
{
- unsigned long addr;
- unsigned long next;
- pgd_t *pgd;
- p4d_t *p4d;
- pud_t *pud;
- pmd_t *pmd;
-
- for (addr = start; addr < end; addr = next) {
- next = pmd_addr_end(addr, end);
-
- pgd = vmemmap_pgd_populate(addr, node);
- if (!pgd)
- return -ENOMEM;
-
- p4d = vmemmap_p4d_populate(pgd, addr, node);
- if (!p4d)
- return -ENOMEM;
-
- pud = vmemmap_pud_populate(p4d, addr, node);
- if (!pud)
- return -ENOMEM;
-
- pmd = pmd_offset(pud, addr);
- if (pmd_none(*pmd)) {
- void *p;
-
- p = vmemmap_alloc_block_buf(PMD_SIZE, node, altmap);
- if (p) {
- pte_t entry;
-
- entry = pfn_pte(__pa(p) >> PAGE_SHIFT,
- PAGE_KERNEL_LARGE);
- set_pmd(pmd, __pmd(pte_val(entry)));
+ pte_t entry;
+
+ entry = pfn_pte(__pa(p) >> PAGE_SHIFT,
+ PAGE_KERNEL_LARGE);
+ set_pmd(pmd, __pmd(pte_val(entry)));
+
+ /* check to see if we have contiguous blocks */
+ if (p_end != p || node_start != node) {
+ if (p_start)
+ pr_debug(" [%lx-%lx] PMD -> [%p-%p] on node %d\n",
+ addr_start, addr_end-1, p_start, p_end-1, node_start);
+ addr_start = addr;
+ node_start = node;
+ p_start = p;
+ }
- /* check to see if we have contiguous blocks */
- if (p_end != p || node_start != node) {
- if (p_start)
- pr_debug(" [%lx-%lx] PMD -> [%p-%p] on node %d\n",
- addr_start, addr_end-1, p_start, p_end-1, node_start);
- addr_start = addr;
- node_start = node;
- p_start = p;
- }
+ addr_end = addr + PMD_SIZE;
+ p_end = p + PMD_SIZE;
- addr_end = addr + PMD_SIZE;
- p_end = p + PMD_SIZE;
+ if (!IS_ALIGNED(addr, PMD_SIZE) ||
+ !IS_ALIGNED(next, PMD_SIZE))
+ vmemmap_use_new_sub_pmd(addr, next);
+}
- if (!IS_ALIGNED(addr, PMD_SIZE) ||
- !IS_ALIGNED(next, PMD_SIZE))
- vmemmap_use_new_sub_pmd(addr, next);
+int __meminit vmemmap_check_pmd(pmd_t *pmd, int node, unsigned long addr,
+ unsigned long next)
+{
+ int large = pmd_large(*pmd);
- continue;
- } else if (altmap)
- return -ENOMEM; /* no fallback */
- } else if (pmd_large(*pmd)) {
- vmemmap_verify((pte_t *)pmd, node, addr, next);
- vmemmap_use_sub_pmd(addr, next);
- continue;
- }
- if (vmemmap_populate_basepages(addr, next, node, NULL))
- return -ENOMEM;
+ if (pmd_large(*pmd)) {
+ vmemmap_verify((pte_t *)pmd, node, addr, next);
+ vmemmap_use_sub_pmd(addr, next);
}
- return 0;
+
+ return large;
}
int __meminit vmemmap_populate(unsigned long start, unsigned long end, int node,
diff --git a/include/linux/mm.h b/include/linux/mm.h
index f6ed6bc0a65f..894d59e1ffd6 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -3216,8 +3216,14 @@ struct vmem_altmap;
void *vmemmap_alloc_block_buf(unsigned long size, int node,
struct vmem_altmap *altmap);
void vmemmap_verify(pte_t *, int, unsigned long, unsigned long);
+void vmemmap_set_pmd(pmd_t *pmd, void *p, int node,
+ unsigned long addr, unsigned long next);
+int vmemmap_check_pmd(pmd_t *pmd, int node, unsigned long addr,
+ unsigned long next);
int vmemmap_populate_basepages(unsigned long start, unsigned long end,
int node, struct vmem_altmap *altmap);
+int vmemmap_populate_hugepages(unsigned long start, unsigned long end,
+ int node, struct vmem_altmap *altmap);
int vmemmap_populate(unsigned long start, unsigned long end, int node,
struct vmem_altmap *altmap);
void vmemmap_populate_print_last(void);
diff --git a/mm/sparse-vmemmap.c b/mm/sparse-vmemmap.c
index 0abcb0a5f1b5..eafd084b8e19 100644
--- a/mm/sparse-vmemmap.c
+++ b/mm/sparse-vmemmap.c
@@ -694,6 +694,69 @@ int __meminit vmemmap_populate_basepages(unsigned long start, unsigned long end,
return vmemmap_populate_range(start, end, node, altmap, NULL);
}
+void __weak __meminit vmemmap_set_pmd(pmd_t *pmd, void *p, int node,
+ unsigned long addr, unsigned long next)
+{
+}
+
+int __weak __meminit vmemmap_check_pmd(pmd_t *pmd, int node, unsigned long addr,
+ unsigned long next)
+{
+ return 0;
+}
+
+int __meminit vmemmap_populate_hugepages(unsigned long start, unsigned long end,
+ int node, struct vmem_altmap *altmap)
+{
+ unsigned long addr;
+ unsigned long next;
+ pgd_t *pgd;
+ p4d_t *p4d;
+ pud_t *pud;
+ pmd_t *pmd;
+
+ for (addr = start; addr < end; addr = next) {
+ next = pmd_addr_end(addr, end);
+
+ pgd = vmemmap_pgd_populate(addr, node);
+ if (!pgd)
+ return -ENOMEM;
+
+ p4d = vmemmap_p4d_populate(pgd, addr, node);
+ if (!p4d)
+ return -ENOMEM;
+
+ pud = vmemmap_pud_populate(p4d, addr, node);
+ if (!pud)
+ return -ENOMEM;
+
+ pmd = pmd_offset(pud, addr);
+ if (pmd_none(READ_ONCE(*pmd))) {
+ void *p;
+
+ p = vmemmap_alloc_block_buf(PMD_SIZE, node, altmap);
+ if (p) {
+ vmemmap_set_pmd(pmd, p, node, addr, next);
+ continue;
+ } else if (altmap) {
+ /*
+ * No fallback: In any case we care about, the
+ * altmap should be reasonably sized and aligned
+ * such that vmemmap_alloc_block_buf() will always
+ * succeed. If there is no more space in the altmap
+ * and we'd have to fallback to PTE (highly unlikely).
+ * That could indicate an altmap-size configuration issue.
+ */
+ return -ENOMEM;
+ }
+ } else if (vmemmap_check_pmd(pmd, node, addr, next))
+ continue;
+ if (vmemmap_populate_basepages(addr, next, node, altmap))
+ return -ENOMEM;
+ }
+ return 0;
+}
+
/*
* For compound pages bigger than section size (e.g. x86 1G compound
* pages with 2M subsection size) fill the rest of sections as tail
--
2.31.1
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