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/*
 * 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?  This 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

/* Home for the page is distributed via hash-for-home. */
#define PAGE_HOME_HASH -4

/* 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, but it can be quite
 * heavyweight, particularly on incoherent or immutable memory.
 */
extern void homecache_finv_page(struct page *);

/*
 * Flush a page out of the specified home cache.
 * Note that the specified home need not be the actual home of the page,
 * as for example might be the case when coordinating with I/O devices.
 */
extern void homecache_finv_map_page(struct page *, int home);

/*
 * 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(struct page *, unsigned int order);
void homecache_free_pages(unsigned long addr, unsigned int order);
#define __homecache_free_page(page) __homecache_free_pages((page), 0)
#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 */

Filemanager

Name Type Size Permission Actions
Kbuild File 439 B 0644
asm-offsets.h File 35 B 0644
atomic.h File 5.14 KB 0644
atomic_32.h File 8.91 KB 0644
atomic_64.h File 5.51 KB 0644
backtrace.h File 3.98 KB 0644
barrier.h File 2.89 KB 0644
bitops.h File 2.37 KB 0644
bitops_32.h File 4.01 KB 0644
bitops_64.h File 2.67 KB 0644
cache.h File 2.6 KB 0644
cacheflush.h File 4.94 KB 0644
checksum.h File 1.23 KB 0644
cmpxchg.h File 3.47 KB 0644
compat.h File 7.38 KB 0644
current.h File 947 B 0644
delay.h File 1.1 KB 0644
device.h File 978 B 0644
div64.h File 319 B 0644
dma-mapping.h File 1.82 KB 0644
dma.h File 762 B 0644
elf.h File 5.42 KB 0644
fixmap.h File 2.73 KB 0644
ftrace.h File 1.08 KB 0644
futex.h File 4.23 KB 0644
hardirq.h File 1.28 KB 0644
hardwall.h File 1.08 KB 0644
highmem.h File 2.08 KB 0644
homecache.h File 4.21 KB 0644
hugetlb.h File 3.04 KB 0644
hv_driver.h File 1.92 KB 0644
ide.h File 758 B 0644
insn.h File 1.79 KB 0644
io.h File 12.43 KB 0644
irq.h File 3.11 KB 0644
irq_work.h File 283 B 0644
irqflags.h File 10.55 KB 0644
jump_label.h File 1.47 KB 0644
kdebug.h File 769 B 0644
kexec.h File 2.23 KB 0644
kgdb.h File 1.99 KB 0644
kmap_types.h File 1.02 KB 0644
kprobes.h File 2.19 KB 0644
linkage.h File 1.46 KB 0644
mmu.h File 965 B 0644
mmu_context.h File 4.5 KB 0644
mmzone.h File 2.07 KB 0644
module.h File 1.12 KB 0644
page.h File 10.32 KB 0644
pci.h File 6.58 KB 0644
percpu.h File 1.79 KB 0644
perf_event.h File 766 B 0644
pgalloc.h File 4.76 KB 0644
pgtable.h File 15.66 KB 0644
pgtable_32.h File 4.08 KB 0644
pgtable_64.h File 5.11 KB 0644
pmc.h File 2.15 KB 0644
processor.h File 10.62 KB 0644
ptrace.h File 2.96 KB 0644
sections.h File 1.37 KB 0644
setup.h File 1.63 KB 0644
sigframe.h File 956 B 0644
signal.h File 1.07 KB 0644
smp.h File 3.98 KB 0644
spinlock.h File 741 B 0644
spinlock_32.h File 2.9 KB 0644
spinlock_64.h File 3.88 KB 0644
spinlock_types.h File 1.58 KB 0644
stack.h File 2.59 KB 0644
string.h File 1.19 KB 0644
switch_to.h File 2.75 KB 0644
syscall.h File 2.88 KB 0644
syscalls.h File 2.35 KB 0644
thread_info.h File 5.54 KB 0644
tile-desc.h File 650 B 0644
tile-desc_32.h File 12.54 KB 0644
tile-desc_64.h File 10.83 KB 0644
timex.h File 1.71 KB 0644
tlb.h File 878 B 0644
tlbflush.h File 3.99 KB 0644
topology.h File 1.52 KB 0644
traps.h File 2.44 KB 0644
uaccess.h File 12.77 KB 0644
unaligned.h File 1.56 KB 0644
unistd.h File 777 B 0644
user.h File 717 B 0644
vdso.h File 1.84 KB 0644
vga.h File 1.05 KB 0644
word-at-a-time.h File 1.07 KB 0644