[mirror_ubuntu-zesty-kernel.git] / arch / mips / mm / cache.c

/*
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 *
 * Copyright (C) 1994 - 2003, 06, 07 by Ralf Baechle (ralf@linux-mips.org)
 * Copyright (C) 2007 MIPS Technologies, Inc.
 */
#include <linux/fs.h>
#include <linux/fcntl.h>
#include <linux/kernel.h>
#include <linux/linkage.h>
#include <linux/export.h>
#include <linux/sched.h>
#include <linux/syscalls.h>
#include <linux/mm.h>

#include <asm/cacheflush.h>
#include <asm/highmem.h>
#include <asm/processor.h>
#include <asm/cpu.h>
#include <asm/cpu-features.h>

/* Cache operations. */
void (*flush_cache_all)(void);
void (*__flush_cache_all)(void);
void (*flush_cache_mm)(struct mm_struct *mm);
void (*flush_cache_range)(struct vm_area_struct *vma, unsigned long start,
	unsigned long end);
void (*flush_cache_page)(struct vm_area_struct *vma, unsigned long page,
	unsigned long pfn);
void (*flush_icache_range)(unsigned long start, unsigned long end);
EXPORT_SYMBOL_GPL(flush_icache_range);
void (*local_flush_icache_range)(unsigned long start, unsigned long end);
EXPORT_SYMBOL_GPL(local_flush_icache_range);
void (*__flush_icache_user_range)(unsigned long start, unsigned long end);
EXPORT_SYMBOL_GPL(__flush_icache_user_range);
void (*__local_flush_icache_user_range)(unsigned long start, unsigned long end);
EXPORT_SYMBOL_GPL(__local_flush_icache_user_range);

void (*__flush_cache_vmap)(void);
void (*__flush_cache_vunmap)(void);

void (*__flush_kernel_vmap_range)(unsigned long vaddr, int size);
EXPORT_SYMBOL_GPL(__flush_kernel_vmap_range);
void (*__invalidate_kernel_vmap_range)(unsigned long vaddr, int size);

/* MIPS specific cache operations */
void (*flush_cache_sigtramp)(unsigned long addr);
void (*local_flush_data_cache_page)(void * addr);
void (*flush_data_cache_page)(unsigned long addr);
void (*flush_icache_all)(void);

EXPORT_SYMBOL_GPL(local_flush_data_cache_page);
EXPORT_SYMBOL(flush_data_cache_page);
EXPORT_SYMBOL(flush_icache_all);

#if defined(CONFIG_DMA_NONCOHERENT) || defined(CONFIG_DMA_MAYBE_COHERENT)

/* DMA cache operations. */
void (*_dma_cache_wback_inv)(unsigned long start, unsigned long size);
void (*_dma_cache_wback)(unsigned long start, unsigned long size);
void (*_dma_cache_inv)(unsigned long start, unsigned long size);

EXPORT_SYMBOL(_dma_cache_wback_inv);

#endif /* CONFIG_DMA_NONCOHERENT || CONFIG_DMA_MAYBE_COHERENT */

/*
 * We could optimize the case where the cache argument is not BCACHE but
 * that seems very atypical use ...
 */
SYSCALL_DEFINE3(cacheflush, unsigned long, addr, unsigned long, bytes,
	unsigned int, cache)
{
	if (bytes == 0)
		return 0;
	if (!access_ok(VERIFY_WRITE, (void __user *) addr, bytes))
		return -EFAULT;

	__flush_icache_user_range(addr, addr + bytes);

	return 0;
}

void __flush_dcache_page(struct page *page)
{
	struct address_space *mapping = page_mapping(page);
	unsigned long addr;

	if (mapping && !mapping_mapped(mapping)) {
		SetPageDcacheDirty(page);
		return;
	}

	/*
	 * We could delay the flush for the !page_mapping case too.  But that
	 * case is for exec env/arg pages and those are %99 certainly going to
	 * get faulted into the tlb (and thus flushed) anyways.
	 */
	if (PageHighMem(page))
		addr = (unsigned long)kmap_atomic(page);
	else
		addr = (unsigned long)page_address(page);

	flush_data_cache_page(addr);

	if (PageHighMem(page))
		__kunmap_atomic((void *)addr);
}

EXPORT_SYMBOL(__flush_dcache_page);

void __flush_anon_page(struct page *page, unsigned long vmaddr)
{
	unsigned long addr = (unsigned long) page_address(page);

	if (pages_do_alias(addr, vmaddr)) {
		if (page_mapcount(page) && !Page_dcache_dirty(page)) {
			void *kaddr;

			kaddr = kmap_coherent(page, vmaddr);
			flush_data_cache_page((unsigned long)kaddr);
			kunmap_coherent();
		} else
			flush_data_cache_page(addr);
	}
}

EXPORT_SYMBOL(__flush_anon_page);

void __update_cache(unsigned long address, pte_t pte)
{
	struct page *page;
	unsigned long pfn, addr;
	int exec = !pte_no_exec(pte) && !cpu_has_ic_fills_f_dc;

	pfn = pte_pfn(pte);
	if (unlikely(!pfn_valid(pfn)))
		return;
	page = pfn_to_page(pfn);
	if (Page_dcache_dirty(page)) {
		if (PageHighMem(page))
			addr = (unsigned long)kmap_atomic(page);
		else
			addr = (unsigned long)page_address(page);

		if (exec || pages_do_alias(addr, address & PAGE_MASK))
			flush_data_cache_page(addr);

		if (PageHighMem(page))
			__kunmap_atomic((void *)addr);

		ClearPageDcacheDirty(page);
	}
}

unsigned long _page_cachable_default;
EXPORT_SYMBOL(_page_cachable_default);

static inline void setup_protection_map(void)
{
	if (cpu_has_rixi) {
		protection_map[0]  = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_EXEC | _PAGE_NO_READ);
		protection_map[1]  = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_EXEC);
		protection_map[2]  = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_EXEC | _PAGE_NO_READ);
		protection_map[3]  = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_EXEC);
		protection_map[4]  = __pgprot(_page_cachable_default | _PAGE_PRESENT);
		protection_map[5]  = __pgprot(_page_cachable_default | _PAGE_PRESENT);
		protection_map[6]  = __pgprot(_page_cachable_default | _PAGE_PRESENT);
		protection_map[7]  = __pgprot(_page_cachable_default | _PAGE_PRESENT);

		protection_map[8]  = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_EXEC | _PAGE_NO_READ);
		protection_map[9]  = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_EXEC);
		protection_map[10] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_EXEC | _PAGE_WRITE | _PAGE_NO_READ);
		protection_map[11] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_EXEC | _PAGE_WRITE);
		protection_map[12] = __pgprot(_page_cachable_default | _PAGE_PRESENT);
		protection_map[13] = __pgprot(_page_cachable_default | _PAGE_PRESENT);
		protection_map[14] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_WRITE);
		protection_map[15] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_WRITE);

	} else {
		protection_map[0] = PAGE_NONE;
		protection_map[1] = PAGE_READONLY;
		protection_map[2] = PAGE_COPY;
		protection_map[3] = PAGE_COPY;
		protection_map[4] = PAGE_READONLY;
		protection_map[5] = PAGE_READONLY;
		protection_map[6] = PAGE_COPY;
		protection_map[7] = PAGE_COPY;
		protection_map[8] = PAGE_NONE;
		protection_map[9] = PAGE_READONLY;
		protection_map[10] = PAGE_SHARED;
		protection_map[11] = PAGE_SHARED;
		protection_map[12] = PAGE_READONLY;
		protection_map[13] = PAGE_READONLY;
		protection_map[14] = PAGE_SHARED;
		protection_map[15] = PAGE_SHARED;
	}
}

void cpu_cache_init(void)
{
	if (cpu_has_3k_cache) {
		extern void __weak r3k_cache_init(void);

		r3k_cache_init();
	}
	if (cpu_has_6k_cache) {
		extern void __weak r6k_cache_init(void);

		r6k_cache_init();
	}
	if (cpu_has_4k_cache) {
		extern void __weak r4k_cache_init(void);

		r4k_cache_init();
	}
	if (cpu_has_8k_cache) {
		extern void __weak r8k_cache_init(void);

		r8k_cache_init();
	}
	if (cpu_has_tx39_cache) {
		extern void __weak tx39_cache_init(void);

		tx39_cache_init();
	}

	if (cpu_has_octeon_cache) {
		extern void __weak octeon_cache_init(void);

		octeon_cache_init();
	}

	setup_protection_map();
}

int __weak __uncached_access(struct file *file, unsigned long addr)
{
	if (file->f_flags & O_DSYNC)
		return 1;

	return addr >= __pa(high_memory);
}
Commit	Line	Data
1da177e4 LT	1	/*
	2	* This file is subject to the terms and conditions of the GNU General Public
	3	* License. See the file "COPYING" in the main directory of this archive
	4	* for more details.
	5	*
641e97f3	6	* Copyright (C) 1994 - 2003, 06, 07 by Ralf Baechle (ralf@linux-mips.org)
7575a49f	7	* Copyright (C) 2007 MIPS Technologies, Inc.
1da177e4	8	*/
24e9d0b9 RB	9	#include <linux/fs.h>
24e9d0b9 RB	10	#include <linux/fcntl.h>
1da177e4	11	#include <linux/kernel.h>
641e97f3	12	#include <linux/linkage.h>
d9ba5778	13	#include <linux/export.h>
1da177e4	14	#include <linux/sched.h>
dbda6ac0	15	#include <linux/syscalls.h>
1da177e4 LT	16	#include <linux/mm.h>
	17
	18	#include <asm/cacheflush.h>
234859e4	19	#include <asm/highmem.h>
1da177e4 LT	20	#include <asm/processor.h>
	21	#include <asm/cpu.h>
	22	#include <asm/cpu-features.h>
	23
	24	/* Cache operations. */
	25	void (*flush_cache_all)(void);
	26	void (*__flush_cache_all)(void);
	27	void (flush_cache_mm)(struct mm_struct mm);
	28	void (flush_cache_range)(struct vm_area_struct vma, unsigned long start,
	29	unsigned long end);
53de0d47 RB	30	void (flush_cache_page)(struct vm_area_struct vma, unsigned long page,
53de0d47 RB	31	unsigned long pfn);
d4264f18	32	void (*flush_icache_range)(unsigned long start, unsigned long end);
8229f1a0	33	EXPORT_SYMBOL_GPL(flush_icache_range);
e0cee3ee	34	void (*local_flush_icache_range)(unsigned long start, unsigned long end);
90f91356	35	EXPORT_SYMBOL_GPL(local_flush_icache_range);
01882b4d JH	36	void (*__flush_icache_user_range)(unsigned long start, unsigned long end);
	37	EXPORT_SYMBOL_GPL(__flush_icache_user_range);
	38	void (*__local_flush_icache_user_range)(unsigned long start, unsigned long end);
	39	EXPORT_SYMBOL_GPL(__local_flush_icache_user_range);
1da177e4	40
9c5a3d72 RB	41	void (*__flush_cache_vmap)(void);
	42	void (*__flush_cache_vunmap)(void);
	43
d9cdc901	44	void (*__flush_kernel_vmap_range)(unsigned long vaddr, int size);
d9cdc901	45	EXPORT_SYMBOL_GPL(__flush_kernel_vmap_range);
8229f1a0	46	void (*__invalidate_kernel_vmap_range)(unsigned long vaddr, int size);
d9cdc901	47
1da177e4 LT	48	/* MIPS specific cache operations */
1da177e4 LT	49	void (*flush_cache_sigtramp)(unsigned long addr);
7e3bfc7c	50	void (local_flush_data_cache_page)(void addr);
1da177e4 LT	51	void (*flush_data_cache_page)(unsigned long addr);
	52	void (*flush_icache_all)(void);
	53
9202f325	54	EXPORT_SYMBOL_GPL(local_flush_data_cache_page);
9ff77c46	55	EXPORT_SYMBOL(flush_data_cache_page);
f2e3656d	56	EXPORT_SYMBOL(flush_icache_all);
9ff77c46	57
8005711c	58	#if defined(CONFIG_DMA_NONCOHERENT) \|\| defined(CONFIG_DMA_MAYBE_COHERENT)
1da177e4 LT	59
	60	/* DMA cache operations. */
	61	void (*_dma_cache_wback_inv)(unsigned long start, unsigned long size);
	62	void (*_dma_cache_wback)(unsigned long start, unsigned long size);
	63	void (*_dma_cache_inv)(unsigned long start, unsigned long size);
	64
	65	EXPORT_SYMBOL(_dma_cache_wback_inv);
1da177e4	66
8005711c	67	#endif /* CONFIG_DMA_NONCOHERENT \|\| CONFIG_DMA_MAYBE_COHERENT */
1da177e4 LT	68
	69	/*
	70	* We could optimize the case where the cache argument is not BCACHE but
	71	* that seems very atypical use ...
	72	*/
dbda6ac0 RB	73	SYSCALL_DEFINE3(cacheflush, unsigned long, addr, unsigned long, bytes,
dbda6ac0 RB	74	unsigned int, cache)
1da177e4	75	{
750ccf68 AN	76	if (bytes == 0)
750ccf68 AN	77	return 0;
fe00f943	78	if (!access_ok(VERIFY_WRITE, (void __user *) addr, bytes))
1da177e4 LT	79	return -EFAULT;
1da177e4 LT	80
8e3a9f4c	81	__flush_icache_user_range(addr, addr + bytes);
1da177e4 LT	82
	83	return 0;
	84	}
	85
	86	void __flush_dcache_page(struct page *page)
	87	{
	88	struct address_space *mapping = page_mapping(page);
	89	unsigned long addr;
	90
	91	if (mapping && !mapping_mapped(mapping)) {
	92	SetPageDcacheDirty(page);
	93	return;
	94	}
	95
	96	/*
	97	* We could delay the flush for the !page_mapping case too. But that
	98	* case is for exec env/arg pages and those are %99 certainly going to
	99	* get faulted into the tlb (and thus flushed) anyways.
	100	*/
234859e4 PB	101	if (PageHighMem(page))
	102	addr = (unsigned long)kmap_atomic(page);
	103	else
	104	addr = (unsigned long)page_address(page);
	105
1da177e4	106	flush_data_cache_page(addr);
234859e4 PB	107
	108	if (PageHighMem(page))
	109	__kunmap_atomic((void *)addr);
1da177e4 LT	110	}
	111
	112	EXPORT_SYMBOL(__flush_dcache_page);
	113
7575a49f RB	114	void __flush_anon_page(struct page *page, unsigned long vmaddr)
7575a49f RB	115	{
9a74b3eb	116	unsigned long addr = (unsigned long) page_address(page);
7575a49f	117
9a74b3eb	118	if (pages_do_alias(addr, vmaddr)) {
e1534ae9	119	if (page_mapcount(page) && !Page_dcache_dirty(page)) {
9a74b3eb RB	120	void *kaddr;
	121
	122	kaddr = kmap_coherent(page, vmaddr);
	123	flush_data_cache_page((unsigned long)kaddr);
	124	kunmap_coherent();
	125	} else
	126	flush_data_cache_page(addr);
7575a49f RB	127	}
	128	}
	129
	130	EXPORT_SYMBOL(__flush_anon_page);
	131
37d22a0d	132	void __update_cache(unsigned long address, pte_t pte)
1da177e4 LT	133	{
1da177e4 LT	134	struct page *page;
5b9593f3	135	unsigned long pfn, addr;
37d22a0d	136	int exec = !pte_no_exec(pte) && !cpu_has_ic_fills_f_dc;
1da177e4	137
5b9593f3	138	pfn = pte_pfn(pte);
585fa724 RB	139	if (unlikely(!pfn_valid(pfn)))
	140	return;
	141	page = pfn_to_page(pfn);
37d22a0d	142	if (Page_dcache_dirty(page)) {
f4281bba PB	143	if (PageHighMem(page))
	144	addr = (unsigned long)kmap_atomic(page);
	145	else
	146	addr = (unsigned long)page_address(page);
	147
5b9593f3 LP	148	if (exec \|\| pages_do_alias(addr, address & PAGE_MASK))
5b9593f3 LP	149	flush_data_cache_page(addr);
f4281bba PB	150
	151	if (PageHighMem(page))
	152	__kunmap_atomic((void *)addr);
	153
1da177e4 LT	154	ClearPageDcacheDirty(page);
	155	}
	156	}
	157
35133692	158	unsigned long _page_cachable_default;
7b3e543d	159	EXPORT_SYMBOL(_page_cachable_default);
35133692 CD	160
	161	static inline void setup_protection_map(void)
	162	{
05857c64	163	if (cpu_has_rixi) {
6dd9344c DD	164	protection_map[0] = __pgprot(_page_cachable_default \| _PAGE_PRESENT \| _PAGE_NO_EXEC \| _PAGE_NO_READ);
	165	protection_map[1] = __pgprot(_page_cachable_default \| _PAGE_PRESENT \| _PAGE_NO_EXEC);
	166	protection_map[2] = __pgprot(_page_cachable_default \| _PAGE_PRESENT \| _PAGE_NO_EXEC \| _PAGE_NO_READ);
	167	protection_map[3] = __pgprot(_page_cachable_default \| _PAGE_PRESENT \| _PAGE_NO_EXEC);
55fdcb2d	168	protection_map[4] = __pgprot(_page_cachable_default \| _PAGE_PRESENT);
6dd9344c	169	protection_map[5] = __pgprot(_page_cachable_default \| _PAGE_PRESENT);
55fdcb2d	170	protection_map[6] = __pgprot(_page_cachable_default \| _PAGE_PRESENT);
6dd9344c DD	171	protection_map[7] = __pgprot(_page_cachable_default \| _PAGE_PRESENT);
	172
	173	protection_map[8] = __pgprot(_page_cachable_default \| _PAGE_PRESENT \| _PAGE_NO_EXEC \| _PAGE_NO_READ);
	174	protection_map[9] = __pgprot(_page_cachable_default \| _PAGE_PRESENT \| _PAGE_NO_EXEC);
	175	protection_map[10] = __pgprot(_page_cachable_default \| _PAGE_PRESENT \| _PAGE_NO_EXEC \| _PAGE_WRITE \| _PAGE_NO_READ);
	176	protection_map[11] = __pgprot(_page_cachable_default \| _PAGE_PRESENT \| _PAGE_NO_EXEC \| _PAGE_WRITE);
55fdcb2d	177	protection_map[12] = __pgprot(_page_cachable_default \| _PAGE_PRESENT);
6dd9344c	178	protection_map[13] = __pgprot(_page_cachable_default \| _PAGE_PRESENT);
55fdcb2d	179	protection_map[14] = __pgprot(_page_cachable_default \| _PAGE_PRESENT \| _PAGE_WRITE);
6dd9344c DD	180	protection_map[15] = __pgprot(_page_cachable_default \| _PAGE_PRESENT \| _PAGE_WRITE);
	181
	182	} else {
	183	protection_map[0] = PAGE_NONE;
	184	protection_map[1] = PAGE_READONLY;
	185	protection_map[2] = PAGE_COPY;
	186	protection_map[3] = PAGE_COPY;
	187	protection_map[4] = PAGE_READONLY;
	188	protection_map[5] = PAGE_READONLY;
	189	protection_map[6] = PAGE_COPY;
	190	protection_map[7] = PAGE_COPY;
	191	protection_map[8] = PAGE_NONE;
	192	protection_map[9] = PAGE_READONLY;
	193	protection_map[10] = PAGE_SHARED;
	194	protection_map[11] = PAGE_SHARED;
	195	protection_map[12] = PAGE_READONLY;
	196	protection_map[13] = PAGE_READONLY;
	197	protection_map[14] = PAGE_SHARED;
	198	protection_map[15] = PAGE_SHARED;
	199	}
35133692	200	}
1da177e4	201
078a55fc	202	void cpu_cache_init(void)
1da177e4	203	{
02cf2119 RB	204	if (cpu_has_3k_cache) {
	205	extern void __weak r3k_cache_init(void);
	206
	207	r3k_cache_init();
02cf2119 RB	208	}
	209	if (cpu_has_6k_cache) {
	210	extern void __weak r6k_cache_init(void);
	211
	212	r6k_cache_init();
1da177e4	213	}
02cf2119 RB	214	if (cpu_has_4k_cache) {
	215	extern void __weak r4k_cache_init(void);
	216
	217	r4k_cache_init();
02cf2119 RB	218	}
	219	if (cpu_has_8k_cache) {
	220	extern void __weak r8k_cache_init(void);
	221
	222	r8k_cache_init();
02cf2119 RB	223	}
	224	if (cpu_has_tx39_cache) {
	225	extern void __weak tx39_cache_init(void);
	226
	227	tx39_cache_init();
02cf2119	228	}
02cf2119	229
47d979ec DD	230	if (cpu_has_octeon_cache) {
	231	extern void __weak octeon_cache_init(void);
	232
	233	octeon_cache_init();
	234	}
	235
35133692	236	setup_protection_map();
1da177e4	237	}
24e9d0b9 RB	238
	239	int __weak __uncached_access(struct file *file, unsigned long addr)
	240	{
6b2f3d1f	241	if (file->f_flags & O_DSYNC)
24e9d0b9 RB	242	return 1;
	243
	244	return addr >= __pa(high_memory);
	245	}