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9e36fda0b3
io_mapping_* interfaces were added, mainly for graphics drivers. Make this interface go through the PAT reserve/free, instead of hardcoding WC mapping. This makes sure that there are no aliases due to unconditional WC setting. Signed-off-by: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com> Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com> Signed-off-by: H. Peter Anvin <hpa@zytor.com>
110 lines
3.1 KiB
C
110 lines
3.1 KiB
C
/*
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* Copyright © 2008 Ingo Molnar
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
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*/
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#include <asm/iomap.h>
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#include <asm/pat.h>
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#include <linux/module.h>
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#include <linux/highmem.h>
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static int is_io_mapping_possible(resource_size_t base, unsigned long size)
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{
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#if !defined(CONFIG_X86_PAE) && defined(CONFIG_PHYS_ADDR_T_64BIT)
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/* There is no way to map greater than 1 << 32 address without PAE */
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if (base + size > 0x100000000ULL)
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return 0;
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#endif
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return 1;
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}
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int iomap_create_wc(resource_size_t base, unsigned long size, pgprot_t *prot)
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{
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unsigned long flag = _PAGE_CACHE_WC;
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int ret;
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if (!is_io_mapping_possible(base, size))
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return -EINVAL;
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ret = io_reserve_memtype(base, base + size, &flag);
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if (ret)
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return ret;
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*prot = __pgprot(__PAGE_KERNEL | flag);
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return 0;
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}
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EXPORT_SYMBOL_GPL(iomap_create_wc);
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void
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iomap_free(resource_size_t base, unsigned long size)
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{
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io_free_memtype(base, base + size);
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}
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EXPORT_SYMBOL_GPL(iomap_free);
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void *kmap_atomic_prot_pfn(unsigned long pfn, enum km_type type, pgprot_t prot)
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{
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enum fixed_addresses idx;
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unsigned long vaddr;
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pagefault_disable();
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debug_kmap_atomic(type);
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idx = type + KM_TYPE_NR * smp_processor_id();
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vaddr = __fix_to_virt(FIX_KMAP_BEGIN + idx);
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set_pte(kmap_pte - idx, pfn_pte(pfn, prot));
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arch_flush_lazy_mmu_mode();
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return (void *)vaddr;
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}
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/*
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* Map 'pfn' using fixed map 'type' and protections 'prot'
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*/
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void *
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iomap_atomic_prot_pfn(unsigned long pfn, enum km_type type, pgprot_t prot)
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{
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/*
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* For non-PAT systems, promote PAGE_KERNEL_WC to PAGE_KERNEL_UC_MINUS.
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* PAGE_KERNEL_WC maps to PWT, which translates to uncached if the
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* MTRR is UC or WC. UC_MINUS gets the real intention, of the
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* user, which is "WC if the MTRR is WC, UC if you can't do that."
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*/
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if (!pat_enabled && pgprot_val(prot) == pgprot_val(PAGE_KERNEL_WC))
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prot = PAGE_KERNEL_UC_MINUS;
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return kmap_atomic_prot_pfn(pfn, type, prot);
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}
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EXPORT_SYMBOL_GPL(iomap_atomic_prot_pfn);
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void
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iounmap_atomic(void *kvaddr, enum km_type type)
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{
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unsigned long vaddr = (unsigned long) kvaddr & PAGE_MASK;
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enum fixed_addresses idx = type + KM_TYPE_NR*smp_processor_id();
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/*
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* Force other mappings to Oops if they'll try to access this pte
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* without first remap it. Keeping stale mappings around is a bad idea
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* also, in case the page changes cacheability attributes or becomes
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* a protected page in a hypervisor.
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*/
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if (vaddr == __fix_to_virt(FIX_KMAP_BEGIN+idx))
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kpte_clear_flush(kmap_pte-idx, vaddr);
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pagefault_enable();
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}
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EXPORT_SYMBOL_GPL(iounmap_atomic);
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