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![Ingo Molnar](/assets/img/avatar_default.png)
Update code that relied on sched.h including various MM types for them. This will allow us to remove the <linux/mm_types.h> include from <linux/sched.h>. Acked-by: Linus Torvalds <torvalds@linux-foundation.org> Cc: Mike Galbraith <efault@gmx.de> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: linux-kernel@vger.kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
344 lines
9.5 KiB
C
344 lines
9.5 KiB
C
/*
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* Copyright 2005, Paul Mackerras, IBM Corporation.
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* Copyright 2009, Benjamin Herrenschmidt, IBM Corporation.
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* Copyright 2015-2016, Aneesh Kumar K.V, IBM Corporation.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#include <linux/sched.h>
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#include <linux/mm_types.h>
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#include <asm/pgalloc.h>
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#include <asm/tlb.h>
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#include "mmu_decl.h"
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#define CREATE_TRACE_POINTS
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#include <trace/events/thp.h>
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#ifdef CONFIG_SPARSEMEM_VMEMMAP
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/*
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* On hash-based CPUs, the vmemmap is bolted in the hash table.
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*
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*/
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int __meminit hash__vmemmap_create_mapping(unsigned long start,
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unsigned long page_size,
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unsigned long phys)
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{
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int rc = htab_bolt_mapping(start, start + page_size, phys,
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pgprot_val(PAGE_KERNEL),
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mmu_vmemmap_psize, mmu_kernel_ssize);
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if (rc < 0) {
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int rc2 = htab_remove_mapping(start, start + page_size,
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mmu_vmemmap_psize,
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mmu_kernel_ssize);
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BUG_ON(rc2 && (rc2 != -ENOENT));
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}
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return rc;
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}
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#ifdef CONFIG_MEMORY_HOTPLUG
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void hash__vmemmap_remove_mapping(unsigned long start,
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unsigned long page_size)
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{
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int rc = htab_remove_mapping(start, start + page_size,
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mmu_vmemmap_psize,
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mmu_kernel_ssize);
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BUG_ON((rc < 0) && (rc != -ENOENT));
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WARN_ON(rc == -ENOENT);
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}
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#endif
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#endif /* CONFIG_SPARSEMEM_VMEMMAP */
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/*
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* map_kernel_page currently only called by __ioremap
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* map_kernel_page adds an entry to the ioremap page table
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* and adds an entry to the HPT, possibly bolting it
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*/
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int hash__map_kernel_page(unsigned long ea, unsigned long pa, unsigned long flags)
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{
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pgd_t *pgdp;
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pud_t *pudp;
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pmd_t *pmdp;
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pte_t *ptep;
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BUILD_BUG_ON(TASK_SIZE_USER64 > H_PGTABLE_RANGE);
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if (slab_is_available()) {
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pgdp = pgd_offset_k(ea);
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pudp = pud_alloc(&init_mm, pgdp, ea);
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if (!pudp)
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return -ENOMEM;
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pmdp = pmd_alloc(&init_mm, pudp, ea);
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if (!pmdp)
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return -ENOMEM;
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ptep = pte_alloc_kernel(pmdp, ea);
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if (!ptep)
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return -ENOMEM;
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set_pte_at(&init_mm, ea, ptep, pfn_pte(pa >> PAGE_SHIFT,
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__pgprot(flags)));
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} else {
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/*
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* If the mm subsystem is not fully up, we cannot create a
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* linux page table entry for this mapping. Simply bolt an
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* entry in the hardware page table.
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*
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*/
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if (htab_bolt_mapping(ea, ea + PAGE_SIZE, pa, flags,
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mmu_io_psize, mmu_kernel_ssize)) {
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printk(KERN_ERR "Failed to do bolted mapping IO "
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"memory at %016lx !\n", pa);
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return -ENOMEM;
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}
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}
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smp_wmb();
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return 0;
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}
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#ifdef CONFIG_TRANSPARENT_HUGEPAGE
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unsigned long hash__pmd_hugepage_update(struct mm_struct *mm, unsigned long addr,
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pmd_t *pmdp, unsigned long clr,
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unsigned long set)
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{
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__be64 old_be, tmp;
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unsigned long old;
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#ifdef CONFIG_DEBUG_VM
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WARN_ON(!pmd_trans_huge(*pmdp));
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assert_spin_locked(&mm->page_table_lock);
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#endif
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__asm__ __volatile__(
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"1: ldarx %0,0,%3\n\
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and. %1,%0,%6\n\
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bne- 1b \n\
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andc %1,%0,%4 \n\
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or %1,%1,%7\n\
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stdcx. %1,0,%3 \n\
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bne- 1b"
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: "=&r" (old_be), "=&r" (tmp), "=m" (*pmdp)
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: "r" (pmdp), "r" (cpu_to_be64(clr)), "m" (*pmdp),
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"r" (cpu_to_be64(H_PAGE_BUSY)), "r" (cpu_to_be64(set))
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: "cc" );
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old = be64_to_cpu(old_be);
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trace_hugepage_update(addr, old, clr, set);
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if (old & H_PAGE_HASHPTE)
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hpte_do_hugepage_flush(mm, addr, pmdp, old);
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return old;
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}
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pmd_t hash__pmdp_collapse_flush(struct vm_area_struct *vma, unsigned long address,
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pmd_t *pmdp)
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{
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pmd_t pmd;
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VM_BUG_ON(address & ~HPAGE_PMD_MASK);
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VM_BUG_ON(pmd_trans_huge(*pmdp));
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pmd = *pmdp;
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pmd_clear(pmdp);
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/*
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* Wait for all pending hash_page to finish. This is needed
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* in case of subpage collapse. When we collapse normal pages
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* to hugepage, we first clear the pmd, then invalidate all
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* the PTE entries. The assumption here is that any low level
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* page fault will see a none pmd and take the slow path that
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* will wait on mmap_sem. But we could very well be in a
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* hash_page with local ptep pointer value. Such a hash page
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* can result in adding new HPTE entries for normal subpages.
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* That means we could be modifying the page content as we
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* copy them to a huge page. So wait for parallel hash_page
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* to finish before invalidating HPTE entries. We can do this
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* by sending an IPI to all the cpus and executing a dummy
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* function there.
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*/
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kick_all_cpus_sync();
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/*
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* Now invalidate the hpte entries in the range
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* covered by pmd. This make sure we take a
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* fault and will find the pmd as none, which will
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* result in a major fault which takes mmap_sem and
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* hence wait for collapse to complete. Without this
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* the __collapse_huge_page_copy can result in copying
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* the old content.
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*/
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flush_tlb_pmd_range(vma->vm_mm, &pmd, address);
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return pmd;
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}
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/*
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* We want to put the pgtable in pmd and use pgtable for tracking
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* the base page size hptes
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*/
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void hash__pgtable_trans_huge_deposit(struct mm_struct *mm, pmd_t *pmdp,
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pgtable_t pgtable)
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{
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pgtable_t *pgtable_slot;
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assert_spin_locked(&mm->page_table_lock);
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/*
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* we store the pgtable in the second half of PMD
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*/
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pgtable_slot = (pgtable_t *)pmdp + PTRS_PER_PMD;
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*pgtable_slot = pgtable;
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/*
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* expose the deposited pgtable to other cpus.
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* before we set the hugepage PTE at pmd level
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* hash fault code looks at the deposted pgtable
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* to store hash index values.
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*/
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smp_wmb();
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}
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pgtable_t hash__pgtable_trans_huge_withdraw(struct mm_struct *mm, pmd_t *pmdp)
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{
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pgtable_t pgtable;
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pgtable_t *pgtable_slot;
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assert_spin_locked(&mm->page_table_lock);
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pgtable_slot = (pgtable_t *)pmdp + PTRS_PER_PMD;
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pgtable = *pgtable_slot;
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/*
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* Once we withdraw, mark the entry NULL.
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*/
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*pgtable_slot = NULL;
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/*
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* We store HPTE information in the deposited PTE fragment.
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* zero out the content on withdraw.
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*/
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memset(pgtable, 0, PTE_FRAG_SIZE);
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return pgtable;
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}
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void hash__pmdp_huge_split_prepare(struct vm_area_struct *vma,
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unsigned long address, pmd_t *pmdp)
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{
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VM_BUG_ON(address & ~HPAGE_PMD_MASK);
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VM_BUG_ON(REGION_ID(address) != USER_REGION_ID);
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/*
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* We can't mark the pmd none here, because that will cause a race
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* against exit_mmap. We need to continue mark pmd TRANS HUGE, while
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* we spilt, but at the same time we wan't rest of the ppc64 code
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* not to insert hash pte on this, because we will be modifying
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* the deposited pgtable in the caller of this function. Hence
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* clear the _PAGE_USER so that we move the fault handling to
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* higher level function and that will serialize against ptl.
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* We need to flush existing hash pte entries here even though,
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* the translation is still valid, because we will withdraw
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* pgtable_t after this.
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*/
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pmd_hugepage_update(vma->vm_mm, address, pmdp, 0, _PAGE_PRIVILEGED);
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}
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/*
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* A linux hugepage PMD was changed and the corresponding hash table entries
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* neesd to be flushed.
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*/
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void hpte_do_hugepage_flush(struct mm_struct *mm, unsigned long addr,
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pmd_t *pmdp, unsigned long old_pmd)
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{
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int ssize;
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unsigned int psize;
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unsigned long vsid;
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unsigned long flags = 0;
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const struct cpumask *tmp;
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/* get the base page size,vsid and segment size */
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#ifdef CONFIG_DEBUG_VM
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psize = get_slice_psize(mm, addr);
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BUG_ON(psize == MMU_PAGE_16M);
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#endif
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if (old_pmd & H_PAGE_COMBO)
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psize = MMU_PAGE_4K;
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else
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psize = MMU_PAGE_64K;
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if (!is_kernel_addr(addr)) {
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ssize = user_segment_size(addr);
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vsid = get_vsid(mm->context.id, addr, ssize);
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WARN_ON(vsid == 0);
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} else {
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vsid = get_kernel_vsid(addr, mmu_kernel_ssize);
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ssize = mmu_kernel_ssize;
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}
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tmp = cpumask_of(smp_processor_id());
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if (cpumask_equal(mm_cpumask(mm), tmp))
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flags |= HPTE_LOCAL_UPDATE;
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return flush_hash_hugepage(vsid, addr, pmdp, psize, ssize, flags);
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}
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pmd_t hash__pmdp_huge_get_and_clear(struct mm_struct *mm,
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unsigned long addr, pmd_t *pmdp)
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{
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pmd_t old_pmd;
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pgtable_t pgtable;
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unsigned long old;
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pgtable_t *pgtable_slot;
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old = pmd_hugepage_update(mm, addr, pmdp, ~0UL, 0);
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old_pmd = __pmd(old);
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/*
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* We have pmd == none and we are holding page_table_lock.
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* So we can safely go and clear the pgtable hash
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* index info.
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*/
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pgtable_slot = (pgtable_t *)pmdp + PTRS_PER_PMD;
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pgtable = *pgtable_slot;
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/*
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* Let's zero out old valid and hash index details
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* hash fault look at them.
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*/
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memset(pgtable, 0, PTE_FRAG_SIZE);
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/*
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* Serialize against find_linux_pte_or_hugepte which does lock-less
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* lookup in page tables with local interrupts disabled. For huge pages
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* it casts pmd_t to pte_t. Since format of pte_t is different from
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* pmd_t we want to prevent transit from pmd pointing to page table
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* to pmd pointing to huge page (and back) while interrupts are disabled.
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* We clear pmd to possibly replace it with page table pointer in
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* different code paths. So make sure we wait for the parallel
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* find_linux_pte_or_hugepage to finish.
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*/
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kick_all_cpus_sync();
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return old_pmd;
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}
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int hash__has_transparent_hugepage(void)
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{
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if (!mmu_has_feature(MMU_FTR_16M_PAGE))
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return 0;
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/*
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* We support THP only if PMD_SIZE is 16MB.
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*/
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if (mmu_psize_defs[MMU_PAGE_16M].shift != PMD_SHIFT)
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return 0;
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/*
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* We need to make sure that we support 16MB hugepage in a segement
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* with base page size 64K or 4K. We only enable THP with a PAGE_SIZE
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* of 64K.
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*/
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/*
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* If we have 64K HPTE, we will be using that by default
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*/
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if (mmu_psize_defs[MMU_PAGE_64K].shift &&
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(mmu_psize_defs[MMU_PAGE_64K].penc[MMU_PAGE_16M] == -1))
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return 0;
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/*
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* Ok we only have 4K HPTE
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*/
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if (mmu_psize_defs[MMU_PAGE_4K].penc[MMU_PAGE_16M] == -1)
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return 0;
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return 1;
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}
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#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
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