提交 801c0be8 编写于 作者: I Ingo Molnar

Merge branches 'x86/urgent' and 'x86/pat' into x86/core

Conflicts:
	arch/x86/include/asm/pat.h
......@@ -24,7 +24,10 @@
#include <asm/tlbflush.h>
int
is_io_mapping_possible(resource_size_t base, unsigned long size);
reserve_io_memtype_wc(u64 base, unsigned long size, pgprot_t *prot);
void
free_io_memtype(u64 base, unsigned long size);
void *
iomap_atomic_prot_pfn(unsigned long pfn, enum km_type type, pgprot_t prot);
......
......@@ -15,4 +15,7 @@ extern int reserve_memtype(u64 start, u64 end,
unsigned long req_type, unsigned long *ret_type);
extern int free_memtype(u64 start, u64 end);
extern int kernel_map_sync_memtype(u64 base, unsigned long size,
unsigned long flag);
#endif /* _ASM_X86_PAT_H */
......@@ -21,13 +21,13 @@
#include <linux/module.h>
#ifdef CONFIG_X86_PAE
int
static int
is_io_mapping_possible(resource_size_t base, unsigned long size)
{
return 1;
}
#else
int
static int
is_io_mapping_possible(resource_size_t base, unsigned long size)
{
/* There is no way to map greater than 1 << 32 address without PAE */
......@@ -38,6 +38,46 @@ is_io_mapping_possible(resource_size_t base, unsigned long size)
}
#endif
int
reserve_io_memtype_wc(u64 base, unsigned long size, pgprot_t *prot)
{
unsigned long ret_flag;
if (!is_io_mapping_possible(base, size))
goto out_err;
if (!pat_enabled) {
*prot = pgprot_noncached(PAGE_KERNEL);
return 0;
}
if (reserve_memtype(base, base + size, _PAGE_CACHE_WC, &ret_flag))
goto out_err;
if (ret_flag == _PAGE_CACHE_WB)
goto out_free;
if (kernel_map_sync_memtype(base, size, ret_flag))
goto out_free;
*prot = __pgprot(__PAGE_KERNEL | ret_flag);
return 0;
out_free:
free_memtype(base, base + size);
out_err:
return -EINVAL;
}
EXPORT_SYMBOL_GPL(reserve_io_memtype_wc);
void
free_io_memtype(u64 base, unsigned long size)
{
if (pat_enabled)
free_memtype(base, base + size);
}
EXPORT_SYMBOL_GPL(free_io_memtype);
/* Map 'pfn' using fixed map 'type' and protections 'prot'
*/
void *
......
......@@ -633,6 +633,33 @@ void unmap_devmem(unsigned long pfn, unsigned long size, pgprot_t vma_prot)
free_memtype(addr, addr + size);
}
/*
* Change the memory type for the physial address range in kernel identity
* mapping space if that range is a part of identity map.
*/
int kernel_map_sync_memtype(u64 base, unsigned long size, unsigned long flags)
{
unsigned long id_sz;
if (!pat_enabled || base >= __pa(high_memory))
return 0;
id_sz = (__pa(high_memory) < base + size) ?
__pa(high_memory) - base :
size;
if (ioremap_change_attr((unsigned long)__va(base), id_sz, flags) < 0) {
printk(KERN_INFO
"%s:%d ioremap_change_attr failed %s "
"for %Lx-%Lx\n",
current->comm, current->pid,
cattr_name(flags),
base, (unsigned long long)(base + size));
return -EINVAL;
}
return 0;
}
/*
* Internal interface to reserve a range of physical memory with prot.
* Reserved non RAM regions only and after successful reserve_memtype,
......@@ -642,7 +669,7 @@ static int reserve_pfn_range(u64 paddr, unsigned long size, pgprot_t *vma_prot,
int strict_prot)
{
int is_ram = 0;
int id_sz, ret;
int ret;
unsigned long flags;
unsigned long want_flags = (pgprot_val(*vma_prot) & _PAGE_CACHE_MASK);
......@@ -679,23 +706,8 @@ static int reserve_pfn_range(u64 paddr, unsigned long size, pgprot_t *vma_prot,
flags);
}
/* Need to keep identity mapping in sync */
if (paddr >= __pa(high_memory))
return 0;
id_sz = (__pa(high_memory) < paddr + size) ?
__pa(high_memory) - paddr :
size;
if (ioremap_change_attr((unsigned long)__va(paddr), id_sz, flags) < 0) {
if (kernel_map_sync_memtype(paddr, size, flags) < 0) {
free_memtype(paddr, paddr + size);
printk(KERN_ERR
"%s:%d reserve_pfn_range ioremap_change_attr failed %s "
"for %Lx-%Lx\n",
current->comm, current->pid,
cattr_name(flags),
(unsigned long long)paddr,
(unsigned long long)(paddr + size));
return -EINVAL;
}
return 0;
......
......@@ -49,8 +49,9 @@ static inline struct io_mapping *
io_mapping_create_wc(resource_size_t base, unsigned long size)
{
struct io_mapping *iomap;
pgprot_t prot;
if (!is_io_mapping_possible(base, size))
if (!reserve_io_memtype_wc(base, size, &prot))
return NULL;
iomap = kmalloc(sizeof(*iomap), GFP_KERNEL);
......@@ -59,13 +60,14 @@ io_mapping_create_wc(resource_size_t base, unsigned long size)
iomap->base = base;
iomap->size = size;
iomap->prot = pgprot_writecombine(__pgprot(__PAGE_KERNEL));
iomap->prot = prot;
return iomap;
}
static inline void
io_mapping_free(struct io_mapping *mapping)
{
free_io_memtype(mapping->base, mapping->size);
kfree(mapping);
}
......
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