bbaa22c3a0
The tilegx PCI root complex support (currently only in linux-next) is limited to pages that are homed on cached in the default manner, i.e. "hash-for-home". This change supports delivery of I/O data to pages that are cached in other ways (locally on a particular core, uncached, user-managed incoherent, etc.). A large part of the change is supporting flushing pages from cache on particular homes so that we can transition the data that we are delivering to or from the device appropriately. The new homecache_finv* routines handle this. Some changes to page_table_range_init() were also required to make the fixmap code work correctly on tilegx; it hadn't been used there before. We also remove some stub mark_caches_evicted_*() routines that were just no-ops anyway. Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
126 lines
4 KiB
C
126 lines
4 KiB
C
/*
|
|
* Copyright (C) 1998 Ingo Molnar
|
|
* Copyright 2010 Tilera Corporation. All Rights Reserved.
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License
|
|
* as published by the Free Software Foundation, version 2.
|
|
*
|
|
* This program is distributed in the hope that it will be useful, but
|
|
* WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
|
|
* NON INFRINGEMENT. See the GNU General Public License for
|
|
* more details.
|
|
*/
|
|
|
|
#ifndef _ASM_TILE_FIXMAP_H
|
|
#define _ASM_TILE_FIXMAP_H
|
|
|
|
#include <asm/page.h>
|
|
|
|
#ifndef __ASSEMBLY__
|
|
#include <linux/kernel.h>
|
|
#ifdef CONFIG_HIGHMEM
|
|
#include <linux/threads.h>
|
|
#include <asm/kmap_types.h>
|
|
#endif
|
|
|
|
#define __fix_to_virt(x) (FIXADDR_TOP - ((x) << PAGE_SHIFT))
|
|
#define __virt_to_fix(x) ((FIXADDR_TOP - ((x)&PAGE_MASK)) >> PAGE_SHIFT)
|
|
|
|
/*
|
|
* Here we define all the compile-time 'special' virtual
|
|
* addresses. The point is to have a constant address at
|
|
* compile time, but to set the physical address only
|
|
* in the boot process. We allocate these special addresses
|
|
* from the end of supervisor virtual memory backwards.
|
|
* Also this lets us do fail-safe vmalloc(), we
|
|
* can guarantee that these special addresses and
|
|
* vmalloc()-ed addresses never overlap.
|
|
*
|
|
* these 'compile-time allocated' memory buffers are
|
|
* fixed-size 4k pages. (or larger if used with an increment
|
|
* higher than 1) use fixmap_set(idx,phys) to associate
|
|
* physical memory with fixmap indices.
|
|
*
|
|
* TLB entries of such buffers will not be flushed across
|
|
* task switches.
|
|
*/
|
|
enum fixed_addresses {
|
|
#ifdef __tilegx__
|
|
/*
|
|
* TILEPro has unmapped memory above so the hole isn't needed,
|
|
* and in any case the hole pushes us over a single 16MB pmd.
|
|
*/
|
|
FIX_HOLE,
|
|
#endif
|
|
#ifdef CONFIG_HIGHMEM
|
|
FIX_KMAP_BEGIN, /* reserved pte's for temporary kernel mappings */
|
|
FIX_KMAP_END = FIX_KMAP_BEGIN+(KM_TYPE_NR*NR_CPUS)-1,
|
|
#endif
|
|
#ifdef __tilegx__ /* see homecache.c */
|
|
FIX_HOMECACHE_BEGIN,
|
|
FIX_HOMECACHE_END = FIX_HOMECACHE_BEGIN+(NR_CPUS)-1,
|
|
#endif
|
|
__end_of_permanent_fixed_addresses,
|
|
|
|
/*
|
|
* Temporary boot-time mappings, used before ioremap() is functional.
|
|
* Not currently needed by the Tile architecture.
|
|
*/
|
|
#define NR_FIX_BTMAPS 0
|
|
#if NR_FIX_BTMAPS
|
|
FIX_BTMAP_END = __end_of_permanent_fixed_addresses,
|
|
FIX_BTMAP_BEGIN = FIX_BTMAP_END + NR_FIX_BTMAPS - 1,
|
|
__end_of_fixed_addresses
|
|
#else
|
|
__end_of_fixed_addresses = __end_of_permanent_fixed_addresses
|
|
#endif
|
|
};
|
|
|
|
extern void __set_fixmap(enum fixed_addresses idx,
|
|
unsigned long phys, pgprot_t flags);
|
|
|
|
#define set_fixmap(idx, phys) \
|
|
__set_fixmap(idx, phys, PAGE_KERNEL)
|
|
#define clear_fixmap(idx) \
|
|
__set_fixmap(idx, 0, __pgprot(0))
|
|
|
|
#define __FIXADDR_SIZE (__end_of_permanent_fixed_addresses << PAGE_SHIFT)
|
|
#define __FIXADDR_BOOT_SIZE (__end_of_fixed_addresses << PAGE_SHIFT)
|
|
#define FIXADDR_START (FIXADDR_TOP + PAGE_SIZE - __FIXADDR_SIZE)
|
|
#define FIXADDR_BOOT_START (FIXADDR_TOP + PAGE_SIZE - __FIXADDR_BOOT_SIZE)
|
|
|
|
extern void __this_fixmap_does_not_exist(void);
|
|
|
|
/*
|
|
* 'index to address' translation. If anyone tries to use the idx
|
|
* directly without tranlation, we catch the bug with a NULL-deference
|
|
* kernel oops. Illegal ranges of incoming indices are caught too.
|
|
*/
|
|
static __always_inline unsigned long fix_to_virt(const unsigned int idx)
|
|
{
|
|
/*
|
|
* this branch gets completely eliminated after inlining,
|
|
* except when someone tries to use fixaddr indices in an
|
|
* illegal way. (such as mixing up address types or using
|
|
* out-of-range indices).
|
|
*
|
|
* If it doesn't get removed, the linker will complain
|
|
* loudly with a reasonably clear error message..
|
|
*/
|
|
if (idx >= __end_of_fixed_addresses)
|
|
__this_fixmap_does_not_exist();
|
|
|
|
return __fix_to_virt(idx);
|
|
}
|
|
|
|
static inline unsigned long virt_to_fix(const unsigned long vaddr)
|
|
{
|
|
BUG_ON(vaddr >= FIXADDR_TOP || vaddr < FIXADDR_START);
|
|
return __virt_to_fix(vaddr);
|
|
}
|
|
|
|
#endif /* !__ASSEMBLY__ */
|
|
|
|
#endif /* _ASM_TILE_FIXMAP_H */
|