diff options
Diffstat (limited to 'arch/powerpc/mm/mmu_context_hash64.c')
| -rw-r--r-- | arch/powerpc/mm/mmu_context_hash64.c | 80 |
1 files changed, 64 insertions, 16 deletions
diff --git a/arch/powerpc/mm/mmu_context_hash64.c b/arch/powerpc/mm/mmu_context_hash64.c index b910d37aea1..178876aef40 100644 --- a/arch/powerpc/mm/mmu_context_hash64.c +++ b/arch/powerpc/mm/mmu_context_hash64.c @@ -18,20 +18,17 @@ #include <linux/mm.h> #include <linux/spinlock.h> #include <linux/idr.h> -#include <linux/module.h> +#include <linux/export.h> +#include <linux/gfp.h> +#include <linux/slab.h> #include <asm/mmu_context.h> +#include <asm/pgalloc.h> -static DEFINE_SPINLOCK(mmu_context_lock); -static DEFINE_IDR(mmu_context_idr); +#include "icswx.h" -/* - * The proto-VSID space has 2^35 - 1 segments available for user mappings. - * Each segment contains 2^28 bytes. Each context maps 2^44 bytes, - * so we can support 2^19-1 contexts (19 == 35 + 28 - 44). - */ -#define NO_CONTEXT 0 -#define MAX_CONTEXT ((1UL << 19) - 1) +static DEFINE_SPINLOCK(mmu_context_lock); +static DEFINE_IDA(mmu_context_ida); int __init_new_context(void) { @@ -39,11 +36,11 @@ int __init_new_context(void) int err; again: - if (!idr_pre_get(&mmu_context_idr, GFP_KERNEL)) + if (!ida_pre_get(&mmu_context_ida, GFP_KERNEL)) return -ENOMEM; spin_lock(&mmu_context_lock); - err = idr_get_new_above(&mmu_context_idr, NULL, 1, &index); + err = ida_get_new_above(&mmu_context_ida, 1, &index); spin_unlock(&mmu_context_lock); if (err == -EAGAIN) @@ -51,9 +48,9 @@ again: else if (err) return err; - if (index > MAX_CONTEXT) { + if (index > MAX_USER_CONTEXT) { spin_lock(&mmu_context_lock); - idr_remove(&mmu_context_idr, index); + ida_remove(&mmu_context_ida, index); spin_unlock(&mmu_context_lock); return -ENOMEM; } @@ -78,21 +75,72 @@ int init_new_context(struct task_struct *tsk, struct mm_struct *mm) slice_set_user_psize(mm, mmu_virtual_psize); subpage_prot_init_new_context(mm); mm->context.id = index; +#ifdef CONFIG_PPC_ICSWX + mm->context.cop_lockp = kmalloc(sizeof(spinlock_t), GFP_KERNEL); + if (!mm->context.cop_lockp) { + __destroy_context(index); + subpage_prot_free(mm); + mm->context.id = MMU_NO_CONTEXT; + return -ENOMEM; + } + spin_lock_init(mm->context.cop_lockp); +#endif /* CONFIG_PPC_ICSWX */ +#ifdef CONFIG_PPC_64K_PAGES + mm->context.pte_frag = NULL; +#endif return 0; } void __destroy_context(int context_id) { spin_lock(&mmu_context_lock); - idr_remove(&mmu_context_idr, context_id); + ida_remove(&mmu_context_ida, context_id); spin_unlock(&mmu_context_lock); } EXPORT_SYMBOL_GPL(__destroy_context); +#ifdef CONFIG_PPC_64K_PAGES +static void destroy_pagetable_page(struct mm_struct *mm) +{ + int count; + void *pte_frag; + struct page *page; + + pte_frag = mm->context.pte_frag; + if (!pte_frag) + return; + + page = virt_to_page(pte_frag); + /* drop all the pending references */ + count = ((unsigned long)pte_frag & ~PAGE_MASK) >> PTE_FRAG_SIZE_SHIFT; + /* We allow PTE_FRAG_NR fragments from a PTE page */ + count = atomic_sub_return(PTE_FRAG_NR - count, &page->_count); + if (!count) { + pgtable_page_dtor(page); + free_hot_cold_page(page, 0); + } +} + +#else +static inline void destroy_pagetable_page(struct mm_struct *mm) +{ + return; +} +#endif + + void destroy_context(struct mm_struct *mm) { + +#ifdef CONFIG_PPC_ICSWX + drop_cop(mm->context.acop, mm); + kfree(mm->context.cop_lockp); + mm->context.cop_lockp = NULL; +#endif /* CONFIG_PPC_ICSWX */ + + destroy_pagetable_page(mm); __destroy_context(mm->context.id); subpage_prot_free(mm); - mm->context.id = NO_CONTEXT; + mm->context.id = MMU_NO_CONTEXT; } |