Merge branch 'merge' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc
* 'merge' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc: vmlinux.lds: fix .data..init_task output section (fix popwerpc boot) powerpc: Fix erroneous lmb->memblock conversions powerpc/mm: Add some debug output when hash insertion fails powerpc/mm: Fix bugs in huge page hashing powerpc/mm: Move around testing of _PAGE_PRESENT in hash code powerpc/mm: Handle hypervisor pte insert failure in __hash_page_huge powerpc/kexec: Fix boundary case for book-e kexec memory limits
This commit is contained in:
commit
86c65a7857
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@ -8,9 +8,9 @@
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* On FSL-BookE we setup a 1:1 mapping which covers the first 2GiB of memory
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* and therefore we can only deal with memory within this range
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*/
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#define KEXEC_SOURCE_MEMORY_LIMIT (2 * 1024 * 1024 * 1024UL)
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#define KEXEC_DESTINATION_MEMORY_LIMIT (2 * 1024 * 1024 * 1024UL)
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#define KEXEC_CONTROL_MEMORY_LIMIT (2 * 1024 * 1024 * 1024UL)
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#define KEXEC_SOURCE_MEMORY_LIMIT (2 * 1024 * 1024 * 1024UL - 1)
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#define KEXEC_DESTINATION_MEMORY_LIMIT (2 * 1024 * 1024 * 1024UL - 1)
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#define KEXEC_CONTROL_MEMORY_LIMIT (2 * 1024 * 1024 * 1024UL - 1)
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#else
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@ -250,7 +250,9 @@ extern int hash_page(unsigned long ea, unsigned long access, unsigned long trap)
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int __hash_page_huge(unsigned long ea, unsigned long access, unsigned long vsid,
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pte_t *ptep, unsigned long trap, int local, int ssize,
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unsigned int shift, unsigned int mmu_psize);
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extern void hash_failure_debug(unsigned long ea, unsigned long access,
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unsigned long vsid, unsigned long trap,
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int ssize, int psize, unsigned long pte);
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extern int htab_bolt_mapping(unsigned long vstart, unsigned long vend,
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unsigned long pstart, unsigned long prot,
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int psize, int ssize);
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@ -414,7 +414,7 @@ static int __init early_init_dt_scan_drconf_memory(unsigned long node)
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u64 base, size, memblock_size;
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unsigned int is_kexec_kdump = 0, rngs;
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ls = of_get_flat_dt_prop(node, "ibm,memblock-size", &l);
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ls = of_get_flat_dt_prop(node, "ibm,lmb-size", &l);
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if (ls == NULL || l < dt_root_size_cells * sizeof(__be32))
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return 0;
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memblock_size = dt_mem_next_cell(dt_root_size_cells, &ls);
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@ -68,9 +68,6 @@ _GLOBAL(__hash_page_4K)
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std r8,STK_PARM(r8)(r1)
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std r9,STK_PARM(r9)(r1)
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/* Add _PAGE_PRESENT to access */
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ori r4,r4,_PAGE_PRESENT
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/* Save non-volatile registers.
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* r31 will hold "old PTE"
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* r30 is "new PTE"
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@ -347,9 +344,6 @@ _GLOBAL(__hash_page_4K)
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std r8,STK_PARM(r8)(r1)
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std r9,STK_PARM(r9)(r1)
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/* Add _PAGE_PRESENT to access */
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ori r4,r4,_PAGE_PRESENT
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/* Save non-volatile registers.
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* r31 will hold "old PTE"
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* r30 is "new PTE"
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@ -687,9 +681,6 @@ _GLOBAL(__hash_page_64K)
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std r8,STK_PARM(r8)(r1)
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std r9,STK_PARM(r9)(r1)
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/* Add _PAGE_PRESENT to access */
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ori r4,r4,_PAGE_PRESENT
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/* Save non-volatile registers.
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* r31 will hold "old PTE"
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* r30 is "new PTE"
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@ -871,6 +871,18 @@ static inline int subpage_protection(struct mm_struct *mm, unsigned long ea)
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}
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#endif
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void hash_failure_debug(unsigned long ea, unsigned long access,
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unsigned long vsid, unsigned long trap,
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int ssize, int psize, unsigned long pte)
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{
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if (!printk_ratelimit())
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return;
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pr_info("mm: Hashing failure ! EA=0x%lx access=0x%lx current=%s\n",
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ea, access, current->comm);
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pr_info(" trap=0x%lx vsid=0x%lx ssize=%d psize=%d pte=0x%lx\n",
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trap, vsid, ssize, psize, pte);
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}
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/* Result code is:
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* 0 - handled
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* 1 - normal page fault
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@ -955,6 +967,17 @@ int hash_page(unsigned long ea, unsigned long access, unsigned long trap)
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return 1;
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}
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/* Add _PAGE_PRESENT to the required access perm */
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access |= _PAGE_PRESENT;
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/* Pre-check access permissions (will be re-checked atomically
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* in __hash_page_XX but this pre-check is a fast path
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*/
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if (access & ~pte_val(*ptep)) {
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DBG_LOW(" no access !\n");
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return 1;
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}
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#ifdef CONFIG_HUGETLB_PAGE
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if (hugeshift)
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return __hash_page_huge(ea, access, vsid, ptep, trap, local,
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@ -967,14 +990,6 @@ int hash_page(unsigned long ea, unsigned long access, unsigned long trap)
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DBG_LOW(" i-pte: %016lx %016lx\n", pte_val(*ptep),
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pte_val(*(ptep + PTRS_PER_PTE)));
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#endif
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/* Pre-check access permissions (will be re-checked atomically
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* in __hash_page_XX but this pre-check is a fast path
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*/
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if (access & ~pte_val(*ptep)) {
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DBG_LOW(" no access !\n");
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return 1;
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}
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/* Do actual hashing */
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#ifdef CONFIG_PPC_64K_PAGES
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/* If _PAGE_4K_PFN is set, make sure this is a 4k segment */
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@ -1033,6 +1048,12 @@ int hash_page(unsigned long ea, unsigned long access, unsigned long trap)
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local, ssize, spp);
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}
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/* Dump some info in case of hash insertion failure, they should
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* never happen so it is really useful to know if/when they do
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*/
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if (rc == -1)
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hash_failure_debug(ea, access, vsid, trap, ssize, psize,
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pte_val(*ptep));
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#ifndef CONFIG_PPC_64K_PAGES
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DBG_LOW(" o-pte: %016lx\n", pte_val(*ptep));
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#else
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@ -1051,8 +1072,7 @@ void hash_preload(struct mm_struct *mm, unsigned long ea,
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void *pgdir;
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pte_t *ptep;
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unsigned long flags;
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int local = 0;
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int ssize;
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int rc, ssize, local = 0;
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BUG_ON(REGION_ID(ea) != USER_REGION_ID);
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@ -1098,11 +1118,18 @@ void hash_preload(struct mm_struct *mm, unsigned long ea,
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/* Hash it in */
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#ifdef CONFIG_PPC_HAS_HASH_64K
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if (mm->context.user_psize == MMU_PAGE_64K)
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__hash_page_64K(ea, access, vsid, ptep, trap, local, ssize);
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rc = __hash_page_64K(ea, access, vsid, ptep, trap, local, ssize);
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else
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#endif /* CONFIG_PPC_HAS_HASH_64K */
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__hash_page_4K(ea, access, vsid, ptep, trap, local, ssize,
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subpage_protection(pgdir, ea));
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rc = __hash_page_4K(ea, access, vsid, ptep, trap, local, ssize,
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subpage_protection(pgdir, ea));
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/* Dump some info in case of hash insertion failure, they should
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* never happen so it is really useful to know if/when they do
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*/
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if (rc == -1)
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hash_failure_debug(ea, access, vsid, trap, ssize,
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mm->context.user_psize, pte_val(*ptep));
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local_irq_restore(flags);
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}
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@ -21,21 +21,13 @@ int __hash_page_huge(unsigned long ea, unsigned long access, unsigned long vsid,
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unsigned long old_pte, new_pte;
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unsigned long va, rflags, pa, sz;
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long slot;
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int err = 1;
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BUG_ON(shift != mmu_psize_defs[mmu_psize].shift);
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/* Search the Linux page table for a match with va */
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va = hpt_va(ea, vsid, ssize);
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/*
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* Check the user's access rights to the page. If access should be
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* prevented then send the problem up to do_page_fault.
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*/
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if (unlikely(access & ~pte_val(*ptep)))
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goto out;
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/*
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* At this point, we have a pte (old_pte) which can be used to build
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/* At this point, we have a pte (old_pte) which can be used to build
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* or update an HPTE. There are 2 cases:
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*
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* 1. There is a valid (present) pte with no associated HPTE (this is
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do {
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old_pte = pte_val(*ptep);
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if (old_pte & _PAGE_BUSY)
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goto out;
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/* If PTE busy, retry the access */
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if (unlikely(old_pte & _PAGE_BUSY))
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return 0;
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/* If PTE permissions don't match, take page fault */
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if (unlikely(access & ~old_pte))
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return 1;
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/* Try to lock the PTE, add ACCESSED and DIRTY if it was
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* a write access */
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new_pte = old_pte | _PAGE_BUSY | _PAGE_ACCESSED;
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if (access & _PAGE_RW)
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new_pte |= _PAGE_DIRTY;
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} while(old_pte != __cmpxchg_u64((unsigned long *)ptep,
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old_pte, new_pte));
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}
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}
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if (unlikely(slot == -2))
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panic("hash_huge_page: pte_insert failed\n");
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/*
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* Hypervisor failure. Restore old pte and return -1
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* similar to __hash_page_*
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*/
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if (unlikely(slot == -2)) {
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*ptep = __pte(old_pte);
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hash_failure_debug(ea, access, vsid, trap, ssize,
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mmu_psize, old_pte);
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return -1;
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}
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new_pte |= (slot << 12) & (_PAGE_F_SECOND | _PAGE_F_GIX);
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}
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* No need to use ldarx/stdcx here
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*/
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*ptep = __pte(new_pte & ~_PAGE_BUSY);
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err = 0;
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out:
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return err;
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return 0;
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}
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@ -398,15 +398,15 @@ static int of_get_drconf_memory(struct device_node *memory, const u32 **dm)
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}
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/*
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* Retreive and validate the ibm,memblock-size property for drconf memory
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* Retreive and validate the ibm,lmb-size property for drconf memory
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* from the device tree.
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*/
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static u64 of_get_memblock_size(struct device_node *memory)
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static u64 of_get_lmb_size(struct device_node *memory)
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{
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const u32 *prop;
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u32 len;
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prop = of_get_property(memory, "ibm,memblock-size", &len);
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prop = of_get_property(memory, "ibm,lmb-size", &len);
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if (!prop || len < sizeof(unsigned int))
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return 0;
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@ -562,7 +562,7 @@ static unsigned long __init numa_enforce_memory_limit(unsigned long start,
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static inline int __init read_usm_ranges(const u32 **usm)
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{
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/*
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* For each memblock in ibm,dynamic-memory a corresponding
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* For each lmb in ibm,dynamic-memory a corresponding
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* entry in linux,drconf-usable-memory property contains
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* a counter followed by that many (base, size) duple.
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* read the counter from linux,drconf-usable-memory
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@ -578,7 +578,7 @@ static void __init parse_drconf_memory(struct device_node *memory)
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{
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const u32 *dm, *usm;
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unsigned int n, rc, ranges, is_kexec_kdump = 0;
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unsigned long memblock_size, base, size, sz;
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unsigned long lmb_size, base, size, sz;
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int nid;
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struct assoc_arrays aa;
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@ -586,8 +586,8 @@ static void __init parse_drconf_memory(struct device_node *memory)
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if (!n)
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return;
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memblock_size = of_get_memblock_size(memory);
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if (!memblock_size)
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lmb_size = of_get_lmb_size(memory);
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if (!lmb_size)
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return;
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rc = of_get_assoc_arrays(memory, &aa);
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@ -611,7 +611,7 @@ static void __init parse_drconf_memory(struct device_node *memory)
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continue;
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base = drmem.base_addr;
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size = memblock_size;
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size = lmb_size;
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ranges = 1;
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if (is_kexec_kdump) {
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@ -1072,7 +1072,7 @@ static int hot_add_drconf_scn_to_nid(struct device_node *memory,
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{
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const u32 *dm;
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unsigned int drconf_cell_cnt, rc;
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unsigned long memblock_size;
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unsigned long lmb_size;
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struct assoc_arrays aa;
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int nid = -1;
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@ -1080,8 +1080,8 @@ static int hot_add_drconf_scn_to_nid(struct device_node *memory,
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if (!drconf_cell_cnt)
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return -1;
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memblock_size = of_get_memblock_size(memory);
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if (!memblock_size)
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lmb_size = of_get_lmb_size(memory);
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if (!lmb_size)
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return -1;
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rc = of_get_assoc_arrays(memory, &aa);
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@ -1100,7 +1100,7 @@ static int hot_add_drconf_scn_to_nid(struct device_node *memory,
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continue;
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if ((scn_addr < drmem.base_addr)
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|| (scn_addr >= (drmem.base_addr + memblock_size)))
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|| (scn_addr >= (drmem.base_addr + lmb_size)))
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continue;
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nid = of_drconf_to_nid_single(&drmem, &aa);
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@ -69,7 +69,7 @@ static int pseries_remove_memory(struct device_node *np)
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const char *type;
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const unsigned int *regs;
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unsigned long base;
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unsigned int memblock_size;
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unsigned int lmb_size;
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int ret = -EINVAL;
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/*
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@ -87,9 +87,9 @@ static int pseries_remove_memory(struct device_node *np)
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return ret;
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base = *(unsigned long *)regs;
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memblock_size = regs[3];
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lmb_size = regs[3];
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ret = pseries_remove_memblock(base, memblock_size);
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ret = pseries_remove_memblock(base, lmb_size);
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return ret;
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}
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@ -98,7 +98,7 @@ static int pseries_add_memory(struct device_node *np)
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const char *type;
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const unsigned int *regs;
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unsigned long base;
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unsigned int memblock_size;
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unsigned int lmb_size;
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int ret = -EINVAL;
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/*
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@ -116,36 +116,36 @@ static int pseries_add_memory(struct device_node *np)
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return ret;
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base = *(unsigned long *)regs;
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memblock_size = regs[3];
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lmb_size = regs[3];
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/*
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* Update memory region to represent the memory add
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*/
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ret = memblock_add(base, memblock_size);
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ret = memblock_add(base, lmb_size);
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return (ret < 0) ? -EINVAL : 0;
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}
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static int pseries_drconf_memory(unsigned long *base, unsigned int action)
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{
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struct device_node *np;
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const unsigned long *memblock_size;
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const unsigned long *lmb_size;
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int rc;
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np = of_find_node_by_path("/ibm,dynamic-reconfiguration-memory");
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if (!np)
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return -EINVAL;
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memblock_size = of_get_property(np, "ibm,memblock-size", NULL);
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if (!memblock_size) {
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lmb_size = of_get_property(np, "ibm,lmb-size", NULL);
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if (!lmb_size) {
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of_node_put(np);
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return -EINVAL;
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}
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if (action == PSERIES_DRCONF_MEM_ADD) {
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rc = memblock_add(*base, *memblock_size);
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rc = memblock_add(*base, *lmb_size);
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rc = (rc < 0) ? -EINVAL : 0;
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} else if (action == PSERIES_DRCONF_MEM_REMOVE) {
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rc = pseries_remove_memblock(*base, *memblock_size);
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rc = pseries_remove_memblock(*base, *lmb_size);
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} else {
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rc = -EINVAL;
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}
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@ -445,7 +445,7 @@
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*/
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#define INIT_TASK_DATA_SECTION(align) \
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. = ALIGN(align); \
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.data..init_task : { \
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.data..init_task : AT(ADDR(.data..init_task) - LOAD_OFFSET) { \
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INIT_TASK_DATA(align) \
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}
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