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authorLinus Torvalds <torvalds@linux-foundation.org>2021-02-22 00:08:42 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2021-02-22 00:08:42 +0300
commit99ca0edb41aabd888ca1548fa0391a4975740a83 (patch)
tree8f2327f46b14e603d0bc2d8b5816f278314712da /mm/memory.c
parent4a037ad5d115b2cc79a5071a7854475f365476fa (diff)
parent1ffa9763828cf73a4d4eaa04c29a4a89fb0708c7 (diff)
downloadlinux-99ca0edb41aabd888ca1548fa0391a4975740a83.tar.xz
Merge tag 'arm64-upstream' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux
Pull arm64 updates from Will Deacon: - vDSO build improvements including support for building with BSD. - Cleanup to the AMU support code and initialisation rework to support cpufreq drivers built as modules. - Removal of synthetic frame record from exception stack when entering the kernel from EL0. - Add support for the TRNG firmware call introduced by Arm spec DEN0098. - Cleanup and refactoring across the board. - Avoid calling arch_get_random_seed_long() from add_interrupt_randomness() - Perf and PMU updates including support for Cortex-A78 and the v8.3 SPE extensions. - Significant steps along the road to leaving the MMU enabled during kexec relocation. - Faultaround changes to initialise prefaulted PTEs as 'old' when hardware access-flag updates are supported, which drastically improves vmscan performance. - CPU errata updates for Cortex-A76 (#1463225) and Cortex-A55 (#1024718) - Preparatory work for yielding the vector unit at a finer granularity in the crypto code, which in turn will one day allow us to defer softirq processing when it is in use. - Support for overriding CPU ID register fields on the command-line. * tag 'arm64-upstream' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux: (85 commits) drivers/perf: Replace spin_lock_irqsave to spin_lock mm: filemap: Fix microblaze build failure with 'mmu_defconfig' arm64: Make CPU_BIG_ENDIAN depend on ld.bfd or ld.lld 13.0.0+ arm64: cpufeatures: Allow disabling of Pointer Auth from the command-line arm64: Defer enabling pointer authentication on boot core arm64: cpufeatures: Allow disabling of BTI from the command-line arm64: Move "nokaslr" over to the early cpufeature infrastructure KVM: arm64: Document HVC_VHE_RESTART stub hypercall arm64: Make kvm-arm.mode={nvhe, protected} an alias of id_aa64mmfr1.vh=0 arm64: Add an aliasing facility for the idreg override arm64: Honor VHE being disabled from the command-line arm64: Allow ID_AA64MMFR1_EL1.VH to be overridden from the command line arm64: cpufeature: Add an early command-line cpufeature override facility arm64: Extract early FDT mapping from kaslr_early_init() arm64: cpufeature: Use IDreg override in __read_sysreg_by_encoding() arm64: cpufeature: Add global feature override facility arm64: Move SCTLR_EL1 initialisation to EL-agnostic code arm64: Simplify init_el2_state to be non-VHE only arm64: Move VHE-specific SPE setup to mutate_to_vhe() arm64: Drop early setting of MDSCR_EL2.TPMS ...
Diffstat (limited to 'mm/memory.c')
-rw-r--r--mm/memory.c223
1 files changed, 78 insertions, 145 deletions
diff --git a/mm/memory.c b/mm/memory.c
index 9e8576a83147..b32f32bf584d 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -134,6 +134,18 @@ static inline bool arch_faults_on_old_pte(void)
}
#endif
+#ifndef arch_wants_old_prefaulted_pte
+static inline bool arch_wants_old_prefaulted_pte(void)
+{
+ /*
+ * Transitioning a PTE from 'old' to 'young' can be expensive on
+ * some architectures, even if it's performed in hardware. By
+ * default, "false" means prefaulted entries will be 'young'.
+ */
+ return false;
+}
+#endif
+
static int __init disable_randmaps(char *s)
{
randomize_va_space = 0;
@@ -3503,7 +3515,7 @@ static vm_fault_t do_anonymous_page(struct vm_fault *vmf)
if (pte_alloc(vma->vm_mm, vmf->pmd))
return VM_FAULT_OOM;
- /* See the comment in pte_alloc_one_map() */
+ /* See comment in handle_pte_fault() */
if (unlikely(pmd_trans_unstable(vmf->pmd)))
return 0;
@@ -3643,66 +3655,6 @@ static vm_fault_t __do_fault(struct vm_fault *vmf)
return ret;
}
-/*
- * The ordering of these checks is important for pmds with _PAGE_DEVMAP set.
- * If we check pmd_trans_unstable() first we will trip the bad_pmd() check
- * inside of pmd_none_or_trans_huge_or_clear_bad(). This will end up correctly
- * returning 1 but not before it spams dmesg with the pmd_clear_bad() output.
- */
-static int pmd_devmap_trans_unstable(pmd_t *pmd)
-{
- return pmd_devmap(*pmd) || pmd_trans_unstable(pmd);
-}
-
-static vm_fault_t pte_alloc_one_map(struct vm_fault *vmf)
-{
- struct vm_area_struct *vma = vmf->vma;
-
- if (!pmd_none(*vmf->pmd))
- goto map_pte;
- if (vmf->prealloc_pte) {
- vmf->ptl = pmd_lock(vma->vm_mm, vmf->pmd);
- if (unlikely(!pmd_none(*vmf->pmd))) {
- spin_unlock(vmf->ptl);
- goto map_pte;
- }
-
- mm_inc_nr_ptes(vma->vm_mm);
- pmd_populate(vma->vm_mm, vmf->pmd, vmf->prealloc_pte);
- spin_unlock(vmf->ptl);
- vmf->prealloc_pte = NULL;
- } else if (unlikely(pte_alloc(vma->vm_mm, vmf->pmd))) {
- return VM_FAULT_OOM;
- }
-map_pte:
- /*
- * If a huge pmd materialized under us just retry later. Use
- * pmd_trans_unstable() via pmd_devmap_trans_unstable() instead of
- * pmd_trans_huge() to ensure the pmd didn't become pmd_trans_huge
- * under us and then back to pmd_none, as a result of MADV_DONTNEED
- * running immediately after a huge pmd fault in a different thread of
- * this mm, in turn leading to a misleading pmd_trans_huge() retval.
- * All we have to ensure is that it is a regular pmd that we can walk
- * with pte_offset_map() and we can do that through an atomic read in
- * C, which is what pmd_trans_unstable() provides.
- */
- if (pmd_devmap_trans_unstable(vmf->pmd))
- return VM_FAULT_NOPAGE;
-
- /*
- * At this point we know that our vmf->pmd points to a page of ptes
- * and it cannot become pmd_none(), pmd_devmap() or pmd_trans_huge()
- * for the duration of the fault. If a racing MADV_DONTNEED runs and
- * we zap the ptes pointed to by our vmf->pmd, the vmf->ptl will still
- * be valid and we will re-check to make sure the vmf->pte isn't
- * pte_none() under vmf->ptl protection when we return to
- * alloc_set_pte().
- */
- vmf->pte = pte_offset_map_lock(vma->vm_mm, vmf->pmd, vmf->address,
- &vmf->ptl);
- return 0;
-}
-
#ifdef CONFIG_TRANSPARENT_HUGEPAGE
static void deposit_prealloc_pte(struct vm_fault *vmf)
{
@@ -3717,7 +3669,7 @@ static void deposit_prealloc_pte(struct vm_fault *vmf)
vmf->prealloc_pte = NULL;
}
-static vm_fault_t do_set_pmd(struct vm_fault *vmf, struct page *page)
+vm_fault_t do_set_pmd(struct vm_fault *vmf, struct page *page)
{
struct vm_area_struct *vma = vmf->vma;
bool write = vmf->flags & FAULT_FLAG_WRITE;
@@ -3775,76 +3727,41 @@ out:
return ret;
}
#else
-static vm_fault_t do_set_pmd(struct vm_fault *vmf, struct page *page)
+vm_fault_t do_set_pmd(struct vm_fault *vmf, struct page *page)
{
- BUILD_BUG();
- return 0;
+ return VM_FAULT_FALLBACK;
}
#endif
-/**
- * alloc_set_pte - setup new PTE entry for given page and add reverse page
- * mapping. If needed, the function allocates page table or use pre-allocated.
- *
- * @vmf: fault environment
- * @page: page to map
- *
- * Caller must take care of unlocking vmf->ptl, if vmf->pte is non-NULL on
- * return.
- *
- * Target users are page handler itself and implementations of
- * vm_ops->map_pages.
- *
- * Return: %0 on success, %VM_FAULT_ code in case of error.
- */
-vm_fault_t alloc_set_pte(struct vm_fault *vmf, struct page *page)
+void do_set_pte(struct vm_fault *vmf, struct page *page, unsigned long addr)
{
struct vm_area_struct *vma = vmf->vma;
bool write = vmf->flags & FAULT_FLAG_WRITE;
+ bool prefault = vmf->address != addr;
pte_t entry;
- vm_fault_t ret;
-
- if (pmd_none(*vmf->pmd) && PageTransCompound(page)) {
- ret = do_set_pmd(vmf, page);
- if (ret != VM_FAULT_FALLBACK)
- return ret;
- }
-
- if (!vmf->pte) {
- ret = pte_alloc_one_map(vmf);
- if (ret)
- return ret;
- }
-
- /* Re-check under ptl */
- if (unlikely(!pte_none(*vmf->pte))) {
- update_mmu_tlb(vma, vmf->address, vmf->pte);
- return VM_FAULT_NOPAGE;
- }
flush_icache_page(vma, page);
entry = mk_pte(page, vma->vm_page_prot);
- entry = pte_sw_mkyoung(entry);
+
+ if (prefault && arch_wants_old_prefaulted_pte())
+ entry = pte_mkold(entry);
+ else
+ entry = pte_sw_mkyoung(entry);
+
if (write)
entry = maybe_mkwrite(pte_mkdirty(entry), vma);
/* copy-on-write page */
if (write && !(vma->vm_flags & VM_SHARED)) {
inc_mm_counter_fast(vma->vm_mm, MM_ANONPAGES);
- page_add_new_anon_rmap(page, vma, vmf->address, false);
+ page_add_new_anon_rmap(page, vma, addr, false);
lru_cache_add_inactive_or_unevictable(page, vma);
} else {
inc_mm_counter_fast(vma->vm_mm, mm_counter_file(page));
page_add_file_rmap(page, false);
}
- set_pte_at(vma->vm_mm, vmf->address, vmf->pte, entry);
-
- /* no need to invalidate: a not-present page won't be cached */
- update_mmu_cache(vma, vmf->address, vmf->pte);
-
- return 0;
+ set_pte_at(vma->vm_mm, addr, vmf->pte, entry);
}
-
/**
* finish_fault - finish page fault once we have prepared the page to fault
*
@@ -3862,12 +3779,12 @@ vm_fault_t alloc_set_pte(struct vm_fault *vmf, struct page *page)
*/
vm_fault_t finish_fault(struct vm_fault *vmf)
{
+ struct vm_area_struct *vma = vmf->vma;
struct page *page;
- vm_fault_t ret = 0;
+ vm_fault_t ret;
/* Did we COW the page? */
- if ((vmf->flags & FAULT_FLAG_WRITE) &&
- !(vmf->vma->vm_flags & VM_SHARED))
+ if ((vmf->flags & FAULT_FLAG_WRITE) && !(vma->vm_flags & VM_SHARED))
page = vmf->cow_page;
else
page = vmf->page;
@@ -3876,12 +3793,38 @@ vm_fault_t finish_fault(struct vm_fault *vmf)
* check even for read faults because we might have lost our CoWed
* page
*/
- if (!(vmf->vma->vm_flags & VM_SHARED))
- ret = check_stable_address_space(vmf->vma->vm_mm);
- if (!ret)
- ret = alloc_set_pte(vmf, page);
- if (vmf->pte)
- pte_unmap_unlock(vmf->pte, vmf->ptl);
+ if (!(vma->vm_flags & VM_SHARED)) {
+ ret = check_stable_address_space(vma->vm_mm);
+ if (ret)
+ return ret;
+ }
+
+ if (pmd_none(*vmf->pmd)) {
+ if (PageTransCompound(page)) {
+ ret = do_set_pmd(vmf, page);
+ if (ret != VM_FAULT_FALLBACK)
+ return ret;
+ }
+
+ if (unlikely(pte_alloc(vma->vm_mm, vmf->pmd)))
+ return VM_FAULT_OOM;
+ }
+
+ /* See comment in handle_pte_fault() */
+ if (pmd_devmap_trans_unstable(vmf->pmd))
+ return 0;
+
+ vmf->pte = pte_offset_map_lock(vma->vm_mm, vmf->pmd,
+ vmf->address, &vmf->ptl);
+ ret = 0;
+ /* Re-check under ptl */
+ if (likely(pte_none(*vmf->pte)))
+ do_set_pte(vmf, page, vmf->address);
+ else
+ ret = VM_FAULT_NOPAGE;
+
+ update_mmu_tlb(vma, vmf->address, vmf->pte);
+ pte_unmap_unlock(vmf->pte, vmf->ptl);
return ret;
}
@@ -3951,13 +3894,12 @@ static vm_fault_t do_fault_around(struct vm_fault *vmf)
pgoff_t start_pgoff = vmf->pgoff;
pgoff_t end_pgoff;
int off;
- vm_fault_t ret = 0;
nr_pages = READ_ONCE(fault_around_bytes) >> PAGE_SHIFT;
mask = ~(nr_pages * PAGE_SIZE - 1) & PAGE_MASK;
- vmf->address = max(address & mask, vmf->vma->vm_start);
- off = ((address - vmf->address) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1);
+ address = max(address & mask, vmf->vma->vm_start);
+ off = ((vmf->address - address) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1);
start_pgoff -= off;
/*
@@ -3965,7 +3907,7 @@ static vm_fault_t do_fault_around(struct vm_fault *vmf)
* the vma or nr_pages from start_pgoff, depending what is nearest.
*/
end_pgoff = start_pgoff -
- ((vmf->address >> PAGE_SHIFT) & (PTRS_PER_PTE - 1)) +
+ ((address >> PAGE_SHIFT) & (PTRS_PER_PTE - 1)) +
PTRS_PER_PTE - 1;
end_pgoff = min3(end_pgoff, vma_pages(vmf->vma) + vmf->vma->vm_pgoff - 1,
start_pgoff + nr_pages - 1);
@@ -3973,31 +3915,11 @@ static vm_fault_t do_fault_around(struct vm_fault *vmf)
if (pmd_none(*vmf->pmd)) {
vmf->prealloc_pte = pte_alloc_one(vmf->vma->vm_mm);
if (!vmf->prealloc_pte)
- goto out;
+ return VM_FAULT_OOM;
smp_wmb(); /* See comment in __pte_alloc() */
}
- vmf->vma->vm_ops->map_pages(vmf, start_pgoff, end_pgoff);
-
- /* Huge page is mapped? Page fault is solved */
- if (pmd_trans_huge(*vmf->pmd)) {
- ret = VM_FAULT_NOPAGE;
- goto out;
- }
-
- /* ->map_pages() haven't done anything useful. Cold page cache? */
- if (!vmf->pte)
- goto out;
-
- /* check if the page fault is solved */
- vmf->pte -= (vmf->address >> PAGE_SHIFT) - (address >> PAGE_SHIFT);
- if (!pte_none(*vmf->pte))
- ret = VM_FAULT_NOPAGE;
- pte_unmap_unlock(vmf->pte, vmf->ptl);
-out:
- vmf->address = address;
- vmf->pte = NULL;
- return ret;
+ return vmf->vma->vm_ops->map_pages(vmf, start_pgoff, end_pgoff);
}
static vm_fault_t do_read_fault(struct vm_fault *vmf)
@@ -4353,7 +4275,18 @@ static vm_fault_t handle_pte_fault(struct vm_fault *vmf)
*/
vmf->pte = NULL;
} else {
- /* See comment in pte_alloc_one_map() */
+ /*
+ * If a huge pmd materialized under us just retry later. Use
+ * pmd_trans_unstable() via pmd_devmap_trans_unstable() instead
+ * of pmd_trans_huge() to ensure the pmd didn't become
+ * pmd_trans_huge under us and then back to pmd_none, as a
+ * result of MADV_DONTNEED running immediately after a huge pmd
+ * fault in a different thread of this mm, in turn leading to a
+ * misleading pmd_trans_huge() retval. All we have to ensure is
+ * that it is a regular pmd that we can walk with
+ * pte_offset_map() and we can do that through an atomic read
+ * in C, which is what pmd_trans_unstable() provides.
+ */
if (pmd_devmap_trans_unstable(vmf->pmd))
return 0;
/*