You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
125 lines
4.1 KiB
125 lines
4.1 KiB
/*
|
|
* 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.
|
|
*
|
|
* Handle issues around the Tile "home cache" model of coherence.
|
|
*/
|
|
|
|
#ifndef _ASM_TILE_HOMECACHE_H
|
|
#define _ASM_TILE_HOMECACHE_H
|
|
|
|
#include <asm/page.h>
|
|
#include <linux/cpumask.h>
|
|
|
|
struct page;
|
|
struct task_struct;
|
|
struct vm_area_struct;
|
|
struct zone;
|
|
|
|
/*
|
|
* Coherence point for the page is its memory controller.
|
|
* It is not present in any cache (L1 or L2).
|
|
*/
|
|
#define PAGE_HOME_UNCACHED -1
|
|
|
|
/*
|
|
* Is this page immutable (unwritable) and thus able to be cached more
|
|
* widely than would otherwise be possible? On tile64 this means we
|
|
* mark the PTE to cache locally; on tilepro it means we have "nc" set.
|
|
*/
|
|
#define PAGE_HOME_IMMUTABLE -2
|
|
|
|
/*
|
|
* Each cpu considers its own cache to be the home for the page,
|
|
* which makes it incoherent.
|
|
*/
|
|
#define PAGE_HOME_INCOHERENT -3
|
|
|
|
#if CHIP_HAS_CBOX_HOME_MAP()
|
|
/* Home for the page is distributed via hash-for-home. */
|
|
#define PAGE_HOME_HASH -4
|
|
#endif
|
|
|
|
/* Homing is unknown or unspecified. Not valid for page_home(). */
|
|
#define PAGE_HOME_UNKNOWN -5
|
|
|
|
/* Home on the current cpu. Not valid for page_home(). */
|
|
#define PAGE_HOME_HERE -6
|
|
|
|
/* Support wrapper to use instead of explicit hv_flush_remote(). */
|
|
extern void flush_remote(unsigned long cache_pfn, unsigned long cache_length,
|
|
const struct cpumask *cache_cpumask,
|
|
HV_VirtAddr tlb_va, unsigned long tlb_length,
|
|
unsigned long tlb_pgsize,
|
|
const struct cpumask *tlb_cpumask,
|
|
HV_Remote_ASID *asids, int asidcount);
|
|
|
|
/* Set homing-related bits in a PTE (can also pass a pgprot_t). */
|
|
extern pte_t pte_set_home(pte_t pte, int home);
|
|
|
|
/* Do a cache eviction on the specified cpus. */
|
|
extern void homecache_evict(const struct cpumask *mask);
|
|
|
|
/*
|
|
* Change a kernel page's homecache. It must not be mapped in user space.
|
|
* If !CONFIG_HOMECACHE, only usable on LOWMEM, and can only be called when
|
|
* no other cpu can reference the page, and causes a full-chip cache/TLB flush.
|
|
*/
|
|
extern void homecache_change_page_home(struct page *, int order, int home);
|
|
|
|
/*
|
|
* Flush a page out of whatever cache(s) it is in.
|
|
* This is more than just finv, since it properly handles waiting
|
|
* for the data to reach memory on tilepro, but it can be quite
|
|
* heavyweight, particularly on hash-for-home memory.
|
|
*/
|
|
extern void homecache_flush_cache(struct page *, int order);
|
|
|
|
/*
|
|
* Allocate a page with the given GFP flags, home, and optionally
|
|
* node. These routines are actually just wrappers around the normal
|
|
* alloc_pages() / alloc_pages_node() functions, which set and clear
|
|
* a per-cpu variable to communicate with homecache_new_kernel_page().
|
|
* If !CONFIG_HOMECACHE, uses homecache_change_page_home().
|
|
*/
|
|
extern struct page *homecache_alloc_pages(gfp_t gfp_mask,
|
|
unsigned int order, int home);
|
|
extern struct page *homecache_alloc_pages_node(int nid, gfp_t gfp_mask,
|
|
unsigned int order, int home);
|
|
#define homecache_alloc_page(gfp_mask, home) \
|
|
homecache_alloc_pages(gfp_mask, 0, home)
|
|
|
|
/*
|
|
* These routines are just pass-throughs to free_pages() when
|
|
* we support full homecaching. If !CONFIG_HOMECACHE, then these
|
|
* routines use homecache_change_page_home() to reset the home
|
|
* back to the default before returning the page to the allocator.
|
|
*/
|
|
void homecache_free_pages(unsigned long addr, unsigned int order);
|
|
#define homecache_free_page(page) \
|
|
homecache_free_pages((page), 0)
|
|
|
|
|
|
|
|
/*
|
|
* Report the page home for LOWMEM pages by examining their kernel PTE,
|
|
* or for highmem pages as the default home.
|
|
*/
|
|
extern int page_home(struct page *);
|
|
|
|
#define homecache_migrate_kthread() do {} while (0)
|
|
|
|
#define homecache_kpte_lock() 0
|
|
#define homecache_kpte_unlock(flags) do {} while (0)
|
|
|
|
|
|
#endif /* _ASM_TILE_HOMECACHE_H */
|
|
|