mirror of https://gitee.com/openkylin/linux.git
761 lines
16 KiB
C
761 lines
16 KiB
C
/*
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* arch/sh/mm/pmb.c
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*
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* Privileged Space Mapping Buffer (PMB) Support.
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*
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* Copyright (C) 2005 - 2010 Paul Mundt
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* Copyright (C) 2010 Matt Fleming
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*/
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/sysdev.h>
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#include <linux/cpu.h>
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/bitops.h>
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#include <linux/debugfs.h>
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#include <linux/fs.h>
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#include <linux/seq_file.h>
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#include <linux/err.h>
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#include <linux/io.h>
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#include <linux/spinlock.h>
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#include <asm/sizes.h>
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#include <asm/system.h>
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#include <asm/uaccess.h>
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#include <asm/pgtable.h>
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#include <asm/page.h>
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#include <asm/mmu.h>
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#include <asm/mmu_context.h>
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struct pmb_entry;
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struct pmb_entry {
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unsigned long vpn;
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unsigned long ppn;
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unsigned long flags;
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unsigned long size;
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spinlock_t lock;
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/*
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* 0 .. NR_PMB_ENTRIES for specific entry selection, or
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* PMB_NO_ENTRY to search for a free one
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*/
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int entry;
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/* Adjacent entry link for contiguous multi-entry mappings */
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struct pmb_entry *link;
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};
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static void pmb_unmap_entry(struct pmb_entry *, int depth);
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static DEFINE_RWLOCK(pmb_rwlock);
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static struct pmb_entry pmb_entry_list[NR_PMB_ENTRIES];
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static DECLARE_BITMAP(pmb_map, NR_PMB_ENTRIES);
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static __always_inline unsigned long mk_pmb_entry(unsigned int entry)
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{
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return (entry & PMB_E_MASK) << PMB_E_SHIFT;
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}
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static __always_inline unsigned long mk_pmb_addr(unsigned int entry)
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{
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return mk_pmb_entry(entry) | PMB_ADDR;
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}
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static __always_inline unsigned long mk_pmb_data(unsigned int entry)
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{
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return mk_pmb_entry(entry) | PMB_DATA;
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}
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static int pmb_alloc_entry(void)
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{
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int pos;
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pos = find_first_zero_bit(pmb_map, NR_PMB_ENTRIES);
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if (pos >= 0 && pos < NR_PMB_ENTRIES)
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__set_bit(pos, pmb_map);
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else
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pos = -ENOSPC;
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return pos;
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}
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static struct pmb_entry *pmb_alloc(unsigned long vpn, unsigned long ppn,
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unsigned long flags, int entry)
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{
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struct pmb_entry *pmbe;
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unsigned long irqflags;
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void *ret = NULL;
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int pos;
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write_lock_irqsave(&pmb_rwlock, irqflags);
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if (entry == PMB_NO_ENTRY) {
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pos = pmb_alloc_entry();
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if (unlikely(pos < 0)) {
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ret = ERR_PTR(pos);
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goto out;
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}
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} else {
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if (__test_and_set_bit(entry, pmb_map)) {
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ret = ERR_PTR(-ENOSPC);
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goto out;
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}
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pos = entry;
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}
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write_unlock_irqrestore(&pmb_rwlock, irqflags);
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pmbe = &pmb_entry_list[pos];
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memset(pmbe, 0, sizeof(struct pmb_entry));
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spin_lock_init(&pmbe->lock);
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pmbe->vpn = vpn;
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pmbe->ppn = ppn;
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pmbe->flags = flags;
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pmbe->entry = pos;
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return pmbe;
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out:
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write_unlock_irqrestore(&pmb_rwlock, irqflags);
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return ret;
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}
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static void pmb_free(struct pmb_entry *pmbe)
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{
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__clear_bit(pmbe->entry, pmb_map);
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pmbe->entry = PMB_NO_ENTRY;
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pmbe->link = NULL;
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}
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/*
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* Ensure that the PMB entries match our cache configuration.
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*
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* When we are in 32-bit address extended mode, CCR.CB becomes
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* invalid, so care must be taken to manually adjust cacheable
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* translations.
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*/
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static __always_inline unsigned long pmb_cache_flags(void)
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{
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unsigned long flags = 0;
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#if defined(CONFIG_CACHE_WRITETHROUGH)
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flags |= PMB_C | PMB_WT | PMB_UB;
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#elif defined(CONFIG_CACHE_WRITEBACK)
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flags |= PMB_C;
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#endif
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return flags;
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}
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/*
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* Must be run uncached.
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*/
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static void __set_pmb_entry(struct pmb_entry *pmbe)
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{
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writel_uncached(pmbe->vpn | PMB_V, mk_pmb_addr(pmbe->entry));
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writel_uncached(pmbe->ppn | pmbe->flags | PMB_V,
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mk_pmb_data(pmbe->entry));
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}
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static void __clear_pmb_entry(struct pmb_entry *pmbe)
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{
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unsigned long addr, data;
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unsigned long addr_val, data_val;
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addr = mk_pmb_addr(pmbe->entry);
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data = mk_pmb_data(pmbe->entry);
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addr_val = __raw_readl(addr);
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data_val = __raw_readl(data);
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/* Clear V-bit */
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writel_uncached(addr_val & ~PMB_V, addr);
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writel_uncached(data_val & ~PMB_V, data);
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}
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static void set_pmb_entry(struct pmb_entry *pmbe)
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{
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unsigned long flags;
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spin_lock_irqsave(&pmbe->lock, flags);
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__set_pmb_entry(pmbe);
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spin_unlock_irqrestore(&pmbe->lock, flags);
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}
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static struct {
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unsigned long size;
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int flag;
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} pmb_sizes[] = {
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{ .size = SZ_512M, .flag = PMB_SZ_512M, },
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{ .size = SZ_128M, .flag = PMB_SZ_128M, },
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{ .size = SZ_64M, .flag = PMB_SZ_64M, },
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{ .size = SZ_16M, .flag = PMB_SZ_16M, },
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};
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long pmb_remap(unsigned long vaddr, unsigned long phys,
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unsigned long size, pgprot_t prot)
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{
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struct pmb_entry *pmbp, *pmbe;
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unsigned long wanted;
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int pmb_flags, i;
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long err;
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u64 flags;
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flags = pgprot_val(prot);
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pmb_flags = PMB_WT | PMB_UB;
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/* Convert typical pgprot value to the PMB equivalent */
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if (flags & _PAGE_CACHABLE) {
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pmb_flags |= PMB_C;
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if ((flags & _PAGE_WT) == 0)
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pmb_flags &= ~(PMB_WT | PMB_UB);
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}
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pmbp = NULL;
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wanted = size;
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again:
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for (i = 0; i < ARRAY_SIZE(pmb_sizes); i++) {
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unsigned long flags;
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if (size < pmb_sizes[i].size)
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continue;
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pmbe = pmb_alloc(vaddr, phys, pmb_flags | pmb_sizes[i].flag,
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PMB_NO_ENTRY);
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if (IS_ERR(pmbe)) {
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err = PTR_ERR(pmbe);
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goto out;
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}
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spin_lock_irqsave(&pmbe->lock, flags);
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__set_pmb_entry(pmbe);
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phys += pmb_sizes[i].size;
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vaddr += pmb_sizes[i].size;
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size -= pmb_sizes[i].size;
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pmbe->size = pmb_sizes[i].size;
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/*
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* Link adjacent entries that span multiple PMB entries
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* for easier tear-down.
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*/
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if (likely(pmbp)) {
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spin_lock(&pmbp->lock);
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pmbp->link = pmbe;
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spin_unlock(&pmbp->lock);
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}
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pmbp = pmbe;
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/*
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* Instead of trying smaller sizes on every iteration
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* (even if we succeed in allocating space), try using
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* pmb_sizes[i].size again.
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*/
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i--;
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spin_unlock_irqrestore(&pmbe->lock, flags);
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}
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if (size >= SZ_16M)
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goto again;
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return wanted - size;
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out:
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pmb_unmap_entry(pmbp, NR_PMB_ENTRIES);
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return err;
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}
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void pmb_unmap(unsigned long addr)
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{
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struct pmb_entry *pmbe = NULL;
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int i;
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read_lock(&pmb_rwlock);
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for (i = 0; i < ARRAY_SIZE(pmb_entry_list); i++) {
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if (test_bit(i, pmb_map)) {
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pmbe = &pmb_entry_list[i];
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if (pmbe->vpn == addr)
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break;
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}
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}
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read_unlock(&pmb_rwlock);
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pmb_unmap_entry(pmbe, NR_PMB_ENTRIES);
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}
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static bool pmb_can_merge(struct pmb_entry *a, struct pmb_entry *b)
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{
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return (b->vpn == (a->vpn + a->size)) &&
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(b->ppn == (a->ppn + a->size)) &&
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(b->flags == a->flags);
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}
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static bool pmb_size_valid(unsigned long size)
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{
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int i;
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for (i = 0; i < ARRAY_SIZE(pmb_sizes); i++)
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if (pmb_sizes[i].size == size)
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return true;
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return false;
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}
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static int pmb_size_to_flags(unsigned long size)
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{
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int i;
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for (i = 0; i < ARRAY_SIZE(pmb_sizes); i++)
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if (pmb_sizes[i].size == size)
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return pmb_sizes[i].flag;
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return 0;
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}
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static void __pmb_unmap_entry(struct pmb_entry *pmbe, int depth)
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{
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do {
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struct pmb_entry *pmblink = pmbe;
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/*
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* We may be called before this pmb_entry has been
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* entered into the PMB table via set_pmb_entry(), but
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* that's OK because we've allocated a unique slot for
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* this entry in pmb_alloc() (even if we haven't filled
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* it yet).
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*
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* Therefore, calling __clear_pmb_entry() is safe as no
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* other mapping can be using that slot.
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*/
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__clear_pmb_entry(pmbe);
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pmbe = pmblink->link;
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pmb_free(pmblink);
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} while (pmbe && --depth);
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}
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static void pmb_unmap_entry(struct pmb_entry *pmbe, int depth)
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{
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unsigned long flags;
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if (unlikely(!pmbe))
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return;
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write_lock_irqsave(&pmb_rwlock, flags);
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__pmb_unmap_entry(pmbe, depth);
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write_unlock_irqrestore(&pmb_rwlock, flags);
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}
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static __always_inline unsigned int pmb_ppn_in_range(unsigned long ppn)
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{
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return ppn >= __pa(memory_start) && ppn < __pa(memory_end);
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}
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static void __init pmb_notify(void)
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{
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int i;
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pr_info("PMB: boot mappings:\n");
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read_lock(&pmb_rwlock);
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for (i = 0; i < ARRAY_SIZE(pmb_entry_list); i++) {
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struct pmb_entry *pmbe;
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if (!test_bit(i, pmb_map))
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continue;
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pmbe = &pmb_entry_list[i];
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pr_info(" 0x%08lx -> 0x%08lx [ %4ldMB %2scached ]\n",
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pmbe->vpn >> PAGE_SHIFT, pmbe->ppn >> PAGE_SHIFT,
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pmbe->size >> 20, (pmbe->flags & PMB_C) ? "" : "un");
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}
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read_unlock(&pmb_rwlock);
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}
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/*
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* Sync our software copy of the PMB mappings with those in hardware. The
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* mappings in the hardware PMB were either set up by the bootloader or
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* very early on by the kernel.
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*/
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static void __init pmb_synchronize(void)
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{
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struct pmb_entry *pmbp = NULL;
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int i, j;
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/*
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* Run through the initial boot mappings, log the established
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* ones, and blow away anything that falls outside of the valid
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* PPN range. Specifically, we only care about existing mappings
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* that impact the cached/uncached sections.
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*
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* Note that touching these can be a bit of a minefield; the boot
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* loader can establish multi-page mappings with the same caching
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* attributes, so we need to ensure that we aren't modifying a
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* mapping that we're presently executing from, or may execute
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* from in the case of straddling page boundaries.
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*
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* In the future we will have to tidy up after the boot loader by
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* jumping between the cached and uncached mappings and tearing
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* down alternating mappings while executing from the other.
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*/
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for (i = 0; i < NR_PMB_ENTRIES; i++) {
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unsigned long addr, data;
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unsigned long addr_val, data_val;
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unsigned long ppn, vpn, flags;
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unsigned long irqflags;
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unsigned int size;
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struct pmb_entry *pmbe;
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addr = mk_pmb_addr(i);
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data = mk_pmb_data(i);
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addr_val = __raw_readl(addr);
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data_val = __raw_readl(data);
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/*
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* Skip over any bogus entries
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*/
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if (!(data_val & PMB_V) || !(addr_val & PMB_V))
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continue;
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ppn = data_val & PMB_PFN_MASK;
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vpn = addr_val & PMB_PFN_MASK;
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/*
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* Only preserve in-range mappings.
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*/
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if (!pmb_ppn_in_range(ppn)) {
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/*
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* Invalidate anything out of bounds.
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*/
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writel_uncached(addr_val & ~PMB_V, addr);
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writel_uncached(data_val & ~PMB_V, data);
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continue;
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}
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/*
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* Update the caching attributes if necessary
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*/
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if (data_val & PMB_C) {
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data_val &= ~PMB_CACHE_MASK;
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data_val |= pmb_cache_flags();
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writel_uncached(data_val, data);
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}
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size = data_val & PMB_SZ_MASK;
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flags = size | (data_val & PMB_CACHE_MASK);
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pmbe = pmb_alloc(vpn, ppn, flags, i);
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if (IS_ERR(pmbe)) {
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WARN_ON_ONCE(1);
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continue;
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}
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spin_lock_irqsave(&pmbe->lock, irqflags);
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for (j = 0; j < ARRAY_SIZE(pmb_sizes); j++)
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if (pmb_sizes[j].flag == size)
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pmbe->size = pmb_sizes[j].size;
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if (pmbp) {
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spin_lock(&pmbp->lock);
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/*
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* Compare the previous entry against the current one to
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* see if the entries span a contiguous mapping. If so,
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* setup the entry links accordingly. Compound mappings
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* are later coalesced.
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*/
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if (pmb_can_merge(pmbp, pmbe))
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pmbp->link = pmbe;
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spin_unlock(&pmbp->lock);
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}
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pmbp = pmbe;
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spin_unlock_irqrestore(&pmbe->lock, irqflags);
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}
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}
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static void __init pmb_merge(struct pmb_entry *head)
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{
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unsigned long span, newsize;
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struct pmb_entry *tail;
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int i = 1, depth = 0;
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span = newsize = head->size;
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tail = head->link;
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while (tail) {
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span += tail->size;
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if (pmb_size_valid(span)) {
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newsize = span;
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depth = i;
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}
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/* This is the end of the line.. */
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if (!tail->link)
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break;
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tail = tail->link;
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i++;
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}
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/*
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* The merged page size must be valid.
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*/
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if (!pmb_size_valid(newsize))
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return;
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head->flags &= ~PMB_SZ_MASK;
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head->flags |= pmb_size_to_flags(newsize);
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head->size = newsize;
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__pmb_unmap_entry(head->link, depth);
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__set_pmb_entry(head);
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}
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static void __init pmb_coalesce(void)
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{
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unsigned long flags;
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int i;
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write_lock_irqsave(&pmb_rwlock, flags);
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for (i = 0; i < ARRAY_SIZE(pmb_entry_list); i++) {
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struct pmb_entry *pmbe;
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if (!test_bit(i, pmb_map))
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continue;
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pmbe = &pmb_entry_list[i];
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/*
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* We're only interested in compound mappings
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*/
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if (!pmbe->link)
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continue;
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/*
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* Nothing to do if it already uses the largest possible
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* page size.
|
|
*/
|
|
if (pmbe->size == SZ_512M)
|
|
continue;
|
|
|
|
pmb_merge(pmbe);
|
|
}
|
|
|
|
write_unlock_irqrestore(&pmb_rwlock, flags);
|
|
}
|
|
|
|
#ifdef CONFIG_UNCACHED_MAPPING
|
|
static void __init pmb_resize(void)
|
|
{
|
|
int i;
|
|
|
|
/*
|
|
* If the uncached mapping was constructed by the kernel, it will
|
|
* already be a reasonable size.
|
|
*/
|
|
if (uncached_size == SZ_16M)
|
|
return;
|
|
|
|
read_lock(&pmb_rwlock);
|
|
|
|
for (i = 0; i < ARRAY_SIZE(pmb_entry_list); i++) {
|
|
struct pmb_entry *pmbe;
|
|
unsigned long flags;
|
|
|
|
if (!test_bit(i, pmb_map))
|
|
continue;
|
|
|
|
pmbe = &pmb_entry_list[i];
|
|
|
|
if (pmbe->vpn != uncached_start)
|
|
continue;
|
|
|
|
/*
|
|
* Found it, now resize it.
|
|
*/
|
|
spin_lock_irqsave(&pmbe->lock, flags);
|
|
|
|
pmbe->size = SZ_16M;
|
|
pmbe->flags &= ~PMB_SZ_MASK;
|
|
pmbe->flags |= pmb_size_to_flags(pmbe->size);
|
|
|
|
uncached_resize(pmbe->size);
|
|
|
|
__set_pmb_entry(pmbe);
|
|
|
|
spin_unlock_irqrestore(&pmbe->lock, flags);
|
|
}
|
|
|
|
read_lock(&pmb_rwlock);
|
|
}
|
|
#endif
|
|
|
|
void __init pmb_init(void)
|
|
{
|
|
/* Synchronize software state */
|
|
pmb_synchronize();
|
|
|
|
/* Attempt to combine compound mappings */
|
|
pmb_coalesce();
|
|
|
|
#ifdef CONFIG_UNCACHED_MAPPING
|
|
/* Resize initial mappings, if necessary */
|
|
pmb_resize();
|
|
#endif
|
|
|
|
/* Log them */
|
|
pmb_notify();
|
|
|
|
writel_uncached(0, PMB_IRMCR);
|
|
|
|
/* Flush out the TLB */
|
|
__raw_writel(__raw_readl(MMUCR) | MMUCR_TI, MMUCR);
|
|
ctrl_barrier();
|
|
}
|
|
|
|
bool __in_29bit_mode(void)
|
|
{
|
|
return (__raw_readl(PMB_PASCR) & PASCR_SE) == 0;
|
|
}
|
|
|
|
static int pmb_seq_show(struct seq_file *file, void *iter)
|
|
{
|
|
int i;
|
|
|
|
seq_printf(file, "V: Valid, C: Cacheable, WT: Write-Through\n"
|
|
"CB: Copy-Back, B: Buffered, UB: Unbuffered\n");
|
|
seq_printf(file, "ety vpn ppn size flags\n");
|
|
|
|
for (i = 0; i < NR_PMB_ENTRIES; i++) {
|
|
unsigned long addr, data;
|
|
unsigned int size;
|
|
char *sz_str = NULL;
|
|
|
|
addr = __raw_readl(mk_pmb_addr(i));
|
|
data = __raw_readl(mk_pmb_data(i));
|
|
|
|
size = data & PMB_SZ_MASK;
|
|
sz_str = (size == PMB_SZ_16M) ? " 16MB":
|
|
(size == PMB_SZ_64M) ? " 64MB":
|
|
(size == PMB_SZ_128M) ? "128MB":
|
|
"512MB";
|
|
|
|
/* 02: V 0x88 0x08 128MB C CB B */
|
|
seq_printf(file, "%02d: %c 0x%02lx 0x%02lx %s %c %s %s\n",
|
|
i, ((addr & PMB_V) && (data & PMB_V)) ? 'V' : ' ',
|
|
(addr >> 24) & 0xff, (data >> 24) & 0xff,
|
|
sz_str, (data & PMB_C) ? 'C' : ' ',
|
|
(data & PMB_WT) ? "WT" : "CB",
|
|
(data & PMB_UB) ? "UB" : " B");
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int pmb_debugfs_open(struct inode *inode, struct file *file)
|
|
{
|
|
return single_open(file, pmb_seq_show, NULL);
|
|
}
|
|
|
|
static const struct file_operations pmb_debugfs_fops = {
|
|
.owner = THIS_MODULE,
|
|
.open = pmb_debugfs_open,
|
|
.read = seq_read,
|
|
.llseek = seq_lseek,
|
|
.release = single_release,
|
|
};
|
|
|
|
static int __init pmb_debugfs_init(void)
|
|
{
|
|
struct dentry *dentry;
|
|
|
|
dentry = debugfs_create_file("pmb", S_IFREG | S_IRUGO,
|
|
sh_debugfs_root, NULL, &pmb_debugfs_fops);
|
|
if (!dentry)
|
|
return -ENOMEM;
|
|
if (IS_ERR(dentry))
|
|
return PTR_ERR(dentry);
|
|
|
|
return 0;
|
|
}
|
|
postcore_initcall(pmb_debugfs_init);
|
|
|
|
#ifdef CONFIG_PM
|
|
static int pmb_sysdev_suspend(struct sys_device *dev, pm_message_t state)
|
|
{
|
|
static pm_message_t prev_state;
|
|
int i;
|
|
|
|
/* Restore the PMB after a resume from hibernation */
|
|
if (state.event == PM_EVENT_ON &&
|
|
prev_state.event == PM_EVENT_FREEZE) {
|
|
struct pmb_entry *pmbe;
|
|
|
|
read_lock(&pmb_rwlock);
|
|
|
|
for (i = 0; i < ARRAY_SIZE(pmb_entry_list); i++) {
|
|
if (test_bit(i, pmb_map)) {
|
|
pmbe = &pmb_entry_list[i];
|
|
set_pmb_entry(pmbe);
|
|
}
|
|
}
|
|
|
|
read_unlock(&pmb_rwlock);
|
|
}
|
|
|
|
prev_state = state;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int pmb_sysdev_resume(struct sys_device *dev)
|
|
{
|
|
return pmb_sysdev_suspend(dev, PMSG_ON);
|
|
}
|
|
|
|
static struct sysdev_driver pmb_sysdev_driver = {
|
|
.suspend = pmb_sysdev_suspend,
|
|
.resume = pmb_sysdev_resume,
|
|
};
|
|
|
|
static int __init pmb_sysdev_init(void)
|
|
{
|
|
return sysdev_driver_register(&cpu_sysdev_class, &pmb_sysdev_driver);
|
|
}
|
|
subsys_initcall(pmb_sysdev_init);
|
|
#endif
|