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Merge branch 'sh/cachetlb'

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This commit is contained in:
Paul Mundt 2009-10-10 21:36:53 +09:00
commit 5e3679c594
4 changed files with 87 additions and 425 deletions
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6
arch/sh/include/asm/fixmap.h
View file

@ -14,9 +14,9 @@
#define _ASM_FIXMAP_H
#include <linux/kernel.h>
#include <linux/threads.h>
#include <asm/page.h>
#ifdef CONFIG_HIGHMEM
#include <linux/threads.h>
#include <asm/kmap_types.h>
#endif
@ -46,9 +46,9 @@
* fix-mapped?
*/
enum fixed_addresses {
#define FIX_N_COLOURS 16
#define FIX_N_COLOURS 8
FIX_CMAP_BEGIN,
FIX_CMAP_END = FIX_CMAP_BEGIN + FIX_N_COLOURS,
FIX_CMAP_END = FIX_CMAP_BEGIN + (FIX_N_COLOURS * NR_CPUS),
FIX_UNCACHED,
#ifdef CONFIG_HIGHMEM
FIX_KMAP_BEGIN, /* reserved pte's for temporary kernel mappings */

496
arch/sh/mm/cache-sh4.c
View file

@ -2,7 +2,7 @@
* arch/sh/mm/cache-sh4.c
*
* Copyright (C) 1999, 2000, 2002 Niibe Yutaka
* Copyright (C) 2001 - 2007 Paul Mundt
* Copyright (C) 2001 - 2009 Paul Mundt
* Copyright (C) 2003 Richard Curnow
* Copyright (c) 2007 STMicroelectronics (R&D) Ltd.
*
@ -15,6 +15,8 @@
#include <linux/io.h>
#include <linux/mutex.h>
#include <linux/fs.h>
#include <linux/highmem.h>
#include <asm/pgtable.h>
#include <asm/mmu_context.h>
#include <asm/cacheflush.h>
@ -23,20 +25,11 @@
* flushing. Anything exceeding this will simply flush the dcache in its
* entirety.
*/
#define MAX_DCACHE_PAGES 64 /* XXX: Tune for ways */
#define MAX_ICACHE_PAGES 32
static void __flush_cache_4096(unsigned long addr, unsigned long phys,
unsigned long exec_offset);
/*
* This is initialised here to ensure that it is not placed in the BSS. If
* that were to happen, note that cache_init gets called before the BSS is
* cleared, so this would get nulled out which would be hopeless.
*/
static void (*__flush_dcache_segment_fn)(unsigned long, unsigned long) =
(void (*)(unsigned long, unsigned long))0xdeadbeef;
/*
* Write back the range of D-cache, and purge the I-cache.
*
@ -123,12 +116,12 @@ static void sh4_flush_dcache_page(void *arg)
else
#endif
{
unsigned long phys = PHYSADDR(page_address(page));
unsigned long phys = page_to_phys(page);
unsigned long addr = CACHE_OC_ADDRESS_ARRAY;
int i, n;
/* Loop all the D-cache */
n = boot_cpu_data.dcache.n_aliases;
n = boot_cpu_data.dcache.way_incr >> 12;
for (i = 0; i < n; i++, addr += 4096)
flush_cache_4096(addr, phys);
}
@ -158,10 +151,27 @@ static void __uses_jump_to_uncached flush_icache_all(void)
local_irq_restore(flags);
}
static inline void flush_dcache_all(void)
static void flush_dcache_all(void)
{
(*__flush_dcache_segment_fn)(0UL, boot_cpu_data.dcache.way_size);
wmb();
unsigned long addr, end_addr, entry_offset;
end_addr = CACHE_OC_ADDRESS_ARRAY +
(current_cpu_data.dcache.sets <<
current_cpu_data.dcache.entry_shift) *
current_cpu_data.dcache.ways;
entry_offset = 1 << current_cpu_data.dcache.entry_shift;
for (addr = CACHE_OC_ADDRESS_ARRAY; addr < end_addr; ) {
__raw_writel(0, addr); addr += entry_offset;
__raw_writel(0, addr); addr += entry_offset;
__raw_writel(0, addr); addr += entry_offset;
__raw_writel(0, addr); addr += entry_offset;
__raw_writel(0, addr); addr += entry_offset;
__raw_writel(0, addr); addr += entry_offset;
__raw_writel(0, addr); addr += entry_offset;
__raw_writel(0, addr); addr += entry_offset;
}
}
static void sh4_flush_cache_all(void *unused)
@ -170,89 +180,13 @@ static void sh4_flush_cache_all(void *unused)
flush_icache_all();
}
static void __flush_cache_mm(struct mm_struct *mm, unsigned long start,
unsigned long end)
{
unsigned long d = 0, p = start & PAGE_MASK;
unsigned long alias_mask = boot_cpu_data.dcache.alias_mask;
unsigned long n_aliases = boot_cpu_data.dcache.n_aliases;
unsigned long select_bit;
unsigned long all_aliases_mask;
unsigned long addr_offset;
pgd_t *dir;
pmd_t *pmd;
pud_t *pud;
pte_t *pte;
int i;
dir = pgd_offset(mm, p);
pud = pud_offset(dir, p);
pmd = pmd_offset(pud, p);
end = PAGE_ALIGN(end);
all_aliases_mask = (1 << n_aliases) - 1;
do {
if (pmd_none(*pmd) || unlikely(pmd_bad(*pmd))) {
p &= PMD_MASK;
p += PMD_SIZE;
pmd++;
continue;
}
pte = pte_offset_kernel(pmd, p);
do {
unsigned long phys;
pte_t entry = *pte;
if (!(pte_val(entry) & _PAGE_PRESENT)) {
pte++;
p += PAGE_SIZE;
continue;
}
phys = pte_val(entry) & PTE_PHYS_MASK;
if ((p ^ phys) & alias_mask) {
d |= 1 << ((p & alias_mask) >> PAGE_SHIFT);
d |= 1 << ((phys & alias_mask) >> PAGE_SHIFT);
if (d == all_aliases_mask)
goto loop_exit;
}
pte++;
p += PAGE_SIZE;
} while (p < end && ((unsigned long)pte & ~PAGE_MASK));
pmd++;
} while (p < end);
loop_exit:
addr_offset = 0;
select_bit = 1;
for (i = 0; i < n_aliases; i++) {
if (d & select_bit) {
(*__flush_dcache_segment_fn)(addr_offset, PAGE_SIZE);
wmb();
}
select_bit <<= 1;
addr_offset += PAGE_SIZE;
}
}
/*
* Note : (RPC) since the caches are physically tagged, the only point
* of flush_cache_mm for SH-4 is to get rid of aliases from the
* D-cache. The assumption elsewhere, e.g. flush_cache_range, is that
* lines can stay resident so long as the virtual address they were
* accessed with (hence cache set) is in accord with the physical
* address (i.e. tag). It's no different here. So I reckon we don't
* need to flush the I-cache, since aliases don't matter for that. We
* should try that.
* address (i.e. tag). It's no different here.
*
* Caller takes mm->mmap_sem.
*/
@ -263,33 +197,7 @@ static void sh4_flush_cache_mm(void *arg)
if (cpu_context(smp_processor_id(), mm) == NO_CONTEXT)
return;
/*
* If cache is only 4k-per-way, there are never any 'aliases'. Since
* the cache is physically tagged, the data can just be left in there.
*/
if (boot_cpu_data.dcache.n_aliases == 0)
return;
/*
* Don't bother groveling around the dcache for the VMA ranges
* if there are too many PTEs to make it worthwhile.
*/
if (mm->nr_ptes >= MAX_DCACHE_PAGES)
flush_dcache_all();
else {
struct vm_area_struct *vma;
/*
* In this case there are reasonably sized ranges to flush,
* iterate through the VMA list and take care of any aliases.
*/
for (vma = mm->mmap; vma; vma = vma->vm_next)
__flush_cache_mm(mm, vma->vm_start, vma->vm_end);
}
/* Only touch the icache if one of the VMAs has VM_EXEC set. */
if (mm->exec_vm)
flush_icache_all();
flush_dcache_all();
}
/*
@ -302,44 +210,64 @@ static void sh4_flush_cache_page(void *args)
{
struct flusher_data *data = args;
struct vm_area_struct *vma;
struct page *page;
unsigned long address, pfn, phys;
unsigned int alias_mask;
int map_coherent = 0;
pgd_t *pgd;
pud_t *pud;
pmd_t *pmd;
pte_t *pte;
void *vaddr;
vma = data->vma;
address = data->addr1;
pfn = data->addr2;
phys = pfn << PAGE_SHIFT;
page = pfn_to_page(pfn);
if (cpu_context(smp_processor_id(), vma->vm_mm) == NO_CONTEXT)
return;
alias_mask = boot_cpu_data.dcache.alias_mask;
address &= PAGE_MASK;
pgd = pgd_offset(vma->vm_mm, address);
pud = pud_offset(pgd, address);
pmd = pmd_offset(pud, address);
pte = pte_offset_kernel(pmd, address);
/* We only need to flush D-cache when we have alias */
if ((address^phys) & alias_mask) {
/* Loop 4K of the D-cache */
flush_cache_4096(
CACHE_OC_ADDRESS_ARRAY | (address & alias_mask),
phys);
/* Loop another 4K of the D-cache */
flush_cache_4096(
CACHE_OC_ADDRESS_ARRAY | (phys & alias_mask),
phys);
/* If the page isn't present, there is nothing to do here. */
if (!(pte_val(*pte) & _PAGE_PRESENT))
return;
if ((vma->vm_mm == current->active_mm))
vaddr = NULL;
else {
/*
* Use kmap_coherent or kmap_atomic to do flushes for
* another ASID than the current one.
*/
map_coherent = (current_cpu_data.dcache.n_aliases &&
!test_bit(PG_dcache_dirty, &page->flags) &&
page_mapped(page));
if (map_coherent)
vaddr = kmap_coherent(page, address);
else
vaddr = kmap_atomic(page, KM_USER0);
address = (unsigned long)vaddr;
}
alias_mask = boot_cpu_data.icache.alias_mask;
if (vma->vm_flags & VM_EXEC) {
/*
* Evict entries from the portion of the cache from which code
* may have been executed at this address (virtual). There's
* no need to evict from the portion corresponding to the
* physical address as for the D-cache, because we know the
* kernel has never executed the code through its identity
* translation.
*/
flush_cache_4096(
CACHE_IC_ADDRESS_ARRAY | (address & alias_mask),
phys);
if (pages_do_alias(address, phys))
flush_cache_4096(CACHE_OC_ADDRESS_ARRAY |
(address & shm_align_mask), phys);
if (vma->vm_flags & VM_EXEC)
flush_icache_all();
if (vaddr) {
if (map_coherent)
kunmap_coherent(vaddr);
else
kunmap_atomic(vaddr, KM_USER0);
}
}
@ -372,24 +300,10 @@ static void sh4_flush_cache_range(void *args)
if (boot_cpu_data.dcache.n_aliases == 0)
return;
/*
* Don't bother with the lookup and alias check if we have a
* wide range to cover, just blow away the dcache in its
* entirety instead. -- PFM.
*/
if (((end - start) >> PAGE_SHIFT) >= MAX_DCACHE_PAGES)
flush_dcache_all();
else
__flush_cache_mm(vma->vm_mm, start, end);
flush_dcache_all();
if (vma->vm_flags & VM_EXEC) {
/*
* TODO: Is this required??? Need to look at how I-cache
* coherency is assured when new programs are loaded to see if
* this matters.
*/
if (vma->vm_flags & VM_EXEC)
flush_icache_all();
}
}
/**
@ -443,7 +357,7 @@ static void __flush_cache_4096(unsigned long addr, unsigned long phys,
* pointless nead-of-loop check for 0 iterations.
*/
do {
ea = base_addr + PAGE_SIZE;
ea = base_addr + 4096;
a = base_addr;
p = phys;
@ -463,245 +377,6 @@ static void __flush_cache_4096(unsigned long addr, unsigned long phys,
} while (--way_count != 0);
}
/*
* Break the 1, 2 and 4 way variants of this out into separate functions to
* avoid nearly all the overhead of having the conditional stuff in the function
* bodies (+ the 1 and 2 way cases avoid saving any registers too).
*
* We want to eliminate unnecessary bus transactions, so this code uses
* a non-obvious technique.
*
* Loop over a cache way sized block of, one cache line at a time. For each
* line, use movca.a to cause the current cache line contents to be written
* back, but without reading anything from main memory. However this has the
* side effect that the cache is now caching that memory location. So follow
* this with a cache invalidate to mark the cache line invalid. And do all
* this with interrupts disabled, to avoid the cache line being accidently
* evicted while it is holding garbage.
*
* This also breaks in a number of circumstances:
* - if there are modifications to the region of memory just above
* empty_zero_page (for example because a breakpoint has been placed
* there), then these can be lost.
*
* This is because the the memory address which the cache temporarily
* caches in the above description is empty_zero_page. So the
* movca.l hits the cache (it is assumed that it misses, or at least
* isn't dirty), modifies the line and then invalidates it, losing the
* required change.
*
* - If caches are disabled or configured in write-through mode, then
* the movca.l writes garbage directly into memory.
*/
static void __flush_dcache_segment_writethrough(unsigned long start,
unsigned long extent_per_way)
{
unsigned long addr;
int i;
addr = CACHE_OC_ADDRESS_ARRAY | (start & cpu_data->dcache.entry_mask);
while (extent_per_way) {
for (i = 0; i < cpu_data->dcache.ways; i++)
__raw_writel(0, addr + cpu_data->dcache.way_incr * i);
addr += cpu_data->dcache.linesz;
extent_per_way -= cpu_data->dcache.linesz;
}
}
static void __flush_dcache_segment_1way(unsigned long start,
unsigned long extent_per_way)
{
unsigned long orig_sr, sr_with_bl;
unsigned long base_addr;
unsigned long way_incr, linesz, way_size;
struct cache_info *dcache;
register unsigned long a0, a0e;
asm volatile("stc sr, %0" : "=r" (orig_sr));
sr_with_bl = orig_sr | (1<<28);
base_addr = ((unsigned long)&empty_zero_page[0]);
/*
* The previous code aligned base_addr to 16k, i.e. the way_size of all
* existing SH-4 D-caches. Whilst I don't see a need to have this
* aligned to any better than the cache line size (which it will be
* anyway by construction), let's align it to at least the way_size of
* any existing or conceivable SH-4 D-cache. -- RPC
*/
base_addr = ((base_addr >> 16) << 16);
base_addr |= start;
dcache = &boot_cpu_data.dcache;
linesz = dcache->linesz;
way_incr = dcache->way_incr;
way_size = dcache->way_size;
a0 = base_addr;
a0e = base_addr + extent_per_way;
do {
asm volatile("ldc %0, sr" : : "r" (sr_with_bl));
asm volatile("movca.l r0, @%0\n\t"
"ocbi @%0" : : "r" (a0));
a0 += linesz;
asm volatile("movca.l r0, @%0\n\t"
"ocbi @%0" : : "r" (a0));
a0 += linesz;
asm volatile("movca.l r0, @%0\n\t"
"ocbi @%0" : : "r" (a0));
a0 += linesz;
asm volatile("movca.l r0, @%0\n\t"
"ocbi @%0" : : "r" (a0));
asm volatile("ldc %0, sr" : : "r" (orig_sr));
a0 += linesz;
} while (a0 < a0e);
}
static void __flush_dcache_segment_2way(unsigned long start,
unsigned long extent_per_way)
{
unsigned long orig_sr, sr_with_bl;
unsigned long base_addr;
unsigned long way_incr, linesz, way_size;
struct cache_info *dcache;
register unsigned long a0, a1, a0e;
asm volatile("stc sr, %0" : "=r" (orig_sr));
sr_with_bl = orig_sr | (1<<28);
base_addr = ((unsigned long)&empty_zero_page[0]);
/* See comment under 1-way above */
base_addr = ((base_addr >> 16) << 16);
base_addr |= start;
dcache = &boot_cpu_data.dcache;
linesz = dcache->linesz;
way_incr = dcache->way_incr;
way_size = dcache->way_size;
a0 = base_addr;
a1 = a0 + way_incr;
a0e = base_addr + extent_per_way;
do {
asm volatile("ldc %0, sr" : : "r" (sr_with_bl));
asm volatile("movca.l r0, @%0\n\t"
"movca.l r0, @%1\n\t"
"ocbi @%0\n\t"
"ocbi @%1" : :
"r" (a0), "r" (a1));
a0 += linesz;
a1 += linesz;
asm volatile("movca.l r0, @%0\n\t"
"movca.l r0, @%1\n\t"
"ocbi @%0\n\t"
"ocbi @%1" : :
"r" (a0), "r" (a1));
a0 += linesz;
a1 += linesz;
asm volatile("movca.l r0, @%0\n\t"
"movca.l r0, @%1\n\t"
"ocbi @%0\n\t"
"ocbi @%1" : :
"r" (a0), "r" (a1));
a0 += linesz;
a1 += linesz;
asm volatile("movca.l r0, @%0\n\t"
"movca.l r0, @%1\n\t"
"ocbi @%0\n\t"
"ocbi @%1" : :
"r" (a0), "r" (a1));
asm volatile("ldc %0, sr" : : "r" (orig_sr));
a0 += linesz;
a1 += linesz;
} while (a0 < a0e);
}
static void __flush_dcache_segment_4way(unsigned long start,
unsigned long extent_per_way)
{
unsigned long orig_sr, sr_with_bl;
unsigned long base_addr;
unsigned long way_incr, linesz, way_size;
struct cache_info *dcache;
register unsigned long a0, a1, a2, a3, a0e;
asm volatile("stc sr, %0" : "=r" (orig_sr));
sr_with_bl = orig_sr | (1<<28);
base_addr = ((unsigned long)&empty_zero_page[0]);
/* See comment under 1-way above */
base_addr = ((base_addr >> 16) << 16);
base_addr |= start;
dcache = &boot_cpu_data.dcache;
linesz = dcache->linesz;
way_incr = dcache->way_incr;
way_size = dcache->way_size;
a0 = base_addr;
a1 = a0 + way_incr;
a2 = a1 + way_incr;
a3 = a2 + way_incr;
a0e = base_addr + extent_per_way;
do {
asm volatile("ldc %0, sr" : : "r" (sr_with_bl));
asm volatile("movca.l r0, @%0\n\t"
"movca.l r0, @%1\n\t"
"movca.l r0, @%2\n\t"
"movca.l r0, @%3\n\t"
"ocbi @%0\n\t"
"ocbi @%1\n\t"
"ocbi @%2\n\t"
"ocbi @%3\n\t" : :
"r" (a0), "r" (a1), "r" (a2), "r" (a3));
a0 += linesz;
a1 += linesz;
a2 += linesz;
a3 += linesz;
asm volatile("movca.l r0, @%0\n\t"
"movca.l r0, @%1\n\t"
"movca.l r0, @%2\n\t"
"movca.l r0, @%3\n\t"
"ocbi @%0\n\t"
"ocbi @%1\n\t"
"ocbi @%2\n\t"
"ocbi @%3\n\t" : :
"r" (a0), "r" (a1), "r" (a2), "r" (a3));
a0 += linesz;
a1 += linesz;
a2 += linesz;
a3 += linesz;
asm volatile("movca.l r0, @%0\n\t"
"movca.l r0, @%1\n\t"
"movca.l r0, @%2\n\t"
"movca.l r0, @%3\n\t"
"ocbi @%0\n\t"
"ocbi @%1\n\t"
"ocbi @%2\n\t"
"ocbi @%3\n\t" : :
"r" (a0), "r" (a1), "r" (a2), "r" (a3));
a0 += linesz;
a1 += linesz;
a2 += linesz;
a3 += linesz;
asm volatile("movca.l r0, @%0\n\t"
"movca.l r0, @%1\n\t"
"movca.l r0, @%2\n\t"
"movca.l r0, @%3\n\t"
"ocbi @%0\n\t"
"ocbi @%1\n\t"
"ocbi @%2\n\t"
"ocbi @%3\n\t" : :
"r" (a0), "r" (a1), "r" (a2), "r" (a3));
asm volatile("ldc %0, sr" : : "r" (orig_sr));
a0 += linesz;
a1 += linesz;
a2 += linesz;
a3 += linesz;
} while (a0 < a0e);
}
extern void __weak sh4__flush_region_init(void);
/*
@ -709,32 +384,11 @@ extern void __weak sh4__flush_region_init(void);
*/
void __init sh4_cache_init(void)
{
unsigned int wt_enabled = !!(__raw_readl(CCR) & CCR_CACHE_WT);
printk("PVR=%08x CVR=%08x PRR=%08x\n",
ctrl_inl(CCN_PVR),
ctrl_inl(CCN_CVR),
ctrl_inl(CCN_PRR));
if (wt_enabled)
__flush_dcache_segment_fn = __flush_dcache_segment_writethrough;
else {
switch (boot_cpu_data.dcache.ways) {
case 1:
__flush_dcache_segment_fn = __flush_dcache_segment_1way;
break;
case 2:
__flush_dcache_segment_fn = __flush_dcache_segment_2way;
break;
case 4:
__flush_dcache_segment_fn = __flush_dcache_segment_4way;
break;
default:
panic("unknown number of cache ways\n");
break;
}
}
local_flush_icache_range = sh4_flush_icache_range;
local_flush_dcache_page = sh4_flush_dcache_page;
local_flush_cache_all = sh4_flush_cache_all;

6
arch/sh/mm/cache.c
View file

@ -164,11 +164,17 @@ void flush_cache_all(void)
void flush_cache_mm(struct mm_struct *mm)
{
if (boot_cpu_data.dcache.n_aliases == 0)
return;
cacheop_on_each_cpu(local_flush_cache_mm, mm, 1);
}
void flush_cache_dup_mm(struct mm_struct *mm)
{
if (boot_cpu_data.dcache.n_aliases == 0)
return;
cacheop_on_each_cpu(local_flush_cache_dup_mm, mm, 1);
}

4
arch/sh/mm/kmap.c
View file

@ -39,7 +39,9 @@ void *kmap_coherent(struct page *page, unsigned long addr)
pagefault_disable();
idx = FIX_CMAP_END -
((addr & current_cpu_data.dcache.alias_mask) >> PAGE_SHIFT);
(((addr >> PAGE_SHIFT) & (FIX_N_COLOURS - 1)) +
(FIX_N_COLOURS * smp_processor_id()));
vaddr = __fix_to_virt(idx);
BUG_ON(!pte_none(*(kmap_coherent_pte - idx)));