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[ARM] xsc3: add highmem support to L2 cache handling code

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On xsc3, L2 cache ops are possible only on virtual addresses.  The code
is rearranged so to have a linear progression requiring the least amount
of pte setups in the highmem case.  To protect the virtual mapping so
created, interrupts must be disabled currently up to a page worth of
address range.

The interrupt disabling is done in a way to minimize the overhead within
the inner loop.  The alternative would consist in separate code for
the highmem and non highmem compilation which is less preferable.

Signed-off-by: Nicolas Pitre <nico@marvell.com>
This commit is contained in:
Nicolas Pitre 2008-09-18 22:55:47 -04:00
parent 1bb772679f
commit 3902a15e78
1 changed files with 82 additions and 29 deletions
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111
arch/arm/mm/cache-xsc3l2.c
View file

@ -17,12 +17,14 @@
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <linux/init.h>
#include <linux/spinlock.h>
#include <linux/io.h>
#include <asm/system.h>
#include <asm/cputype.h>
#include <asm/cacheflush.h>
#include <asm/kmap_types.h>
#include <asm/fixmap.h>
#include <asm/pgtable.h>
#include <asm/tlbflush.h>
#include "mm.h"
#define CR_L2 (1 << 26)
@ -47,21 +49,11 @@ static inline void xsc3_l2_clean_mva(unsigned long addr)
__asm__("mcr p15, 1, %0, c7, c11, 1" : : "r" (addr));
}
static inline void xsc3_l2_clean_pa(unsigned long addr)
{
xsc3_l2_clean_mva(__phys_to_virt(addr));
}
static inline void xsc3_l2_inv_mva(unsigned long addr)
{
__asm__("mcr p15, 1, %0, c7, c7, 1" : : "r" (addr));
}
static inline void xsc3_l2_inv_pa(unsigned long addr)
{
xsc3_l2_inv_mva(__phys_to_virt(addr));
}
static inline void xsc3_l2_inv_all(void)
{
unsigned long l2ctype, set_way;
@ -79,50 +71,103 @@ static inline void xsc3_l2_inv_all(void)
dsb();
}
#ifdef CONFIG_HIGHMEM
#define l2_map_save_flags(x) raw_local_save_flags(x)
#define l2_map_restore_flags(x) raw_local_irq_restore(x)
#else
#define l2_map_save_flags(x) ((x) = 0)
#define l2_map_restore_flags(x) ((void)(x))
#endif
static inline unsigned long l2_map_va(unsigned long pa, unsigned long prev_va,
unsigned long flags)
{
#ifdef CONFIG_HIGHMEM
unsigned long va = prev_va & PAGE_MASK;
unsigned long pa_offset = pa << (32 - PAGE_SHIFT);
if (unlikely(pa_offset < (prev_va << (32 - PAGE_SHIFT)))) {
/*
* Switching to a new page. Because cache ops are
* using virtual addresses only, we must put a mapping
* in place for it. We also enable interrupts for a
* short while and disable them again to protect this
* mapping.
*/
unsigned long idx;
raw_local_irq_restore(flags);
idx = KM_L2_CACHE + KM_TYPE_NR * smp_processor_id();
va = __fix_to_virt(FIX_KMAP_BEGIN + idx);
raw_local_irq_restore(flags | PSR_I_BIT);
set_pte_ext(TOP_PTE(va), pfn_pte(pa >> PAGE_SHIFT, PAGE_KERNEL), 0);
local_flush_tlb_kernel_page(va);
}
return va + (pa_offset >> (32 - PAGE_SHIFT));
#else
return __phys_to_virt(pa);
#endif
}
static void xsc3_l2_inv_range(unsigned long start, unsigned long end)
{
unsigned long vaddr, flags;
if (start == 0 && end == -1ul) {
xsc3_l2_inv_all();
return;
}
vaddr = -1; /* to force the first mapping */
l2_map_save_flags(flags);
/*
* Clean and invalidate partial first cache line.
*/
if (start & (CACHE_LINE_SIZE - 1)) {
xsc3_l2_clean_pa(start & ~(CACHE_LINE_SIZE - 1));
xsc3_l2_inv_pa(start & ~(CACHE_LINE_SIZE - 1));
vaddr = l2_map_va(start & ~(CACHE_LINE_SIZE - 1), vaddr, flags);
xsc3_l2_clean_mva(vaddr);
xsc3_l2_inv_mva(vaddr);
start = (start | (CACHE_LINE_SIZE - 1)) + 1;
}
/*
* Clean and invalidate partial last cache line.
*/
if (start < end && (end & (CACHE_LINE_SIZE - 1))) {
xsc3_l2_clean_pa(end & ~(CACHE_LINE_SIZE - 1));
xsc3_l2_inv_pa(end & ~(CACHE_LINE_SIZE - 1));
end &= ~(CACHE_LINE_SIZE - 1);
}
/*
* Invalidate all full cache lines between 'start' and 'end'.
*/
while (start < end) {
xsc3_l2_inv_pa(start);
while (start < (end & ~(CACHE_LINE_SIZE - 1))) {
vaddr = l2_map_va(start, vaddr, flags);
xsc3_l2_inv_mva(vaddr);
start += CACHE_LINE_SIZE;
}
/*
* Clean and invalidate partial last cache line.
*/
if (start < end) {
vaddr = l2_map_va(start, vaddr, flags);
xsc3_l2_clean_mva(vaddr);
xsc3_l2_inv_mva(vaddr);
}
l2_map_restore_flags(flags);
dsb();
}
static void xsc3_l2_clean_range(unsigned long start, unsigned long end)
{
unsigned long vaddr, flags;
vaddr = -1; /* to force the first mapping */
l2_map_save_flags(flags);
start &= ~(CACHE_LINE_SIZE - 1);
while (start < end) {
xsc3_l2_clean_pa(start);
vaddr = l2_map_va(start, vaddr, flags);
xsc3_l2_clean_mva(vaddr);
start += CACHE_LINE_SIZE;
}
l2_map_restore_flags(flags);
dsb();
}
@ -148,18 +193,26 @@ static inline void xsc3_l2_flush_all(void)
static void xsc3_l2_flush_range(unsigned long start, unsigned long end)
{
unsigned long vaddr, flags;
if (start == 0 && end == -1ul) {
xsc3_l2_flush_all();
return;
}
vaddr = -1; /* to force the first mapping */
l2_map_save_flags(flags);
start &= ~(CACHE_LINE_SIZE - 1);
while (start < end) {
xsc3_l2_clean_pa(start);
xsc3_l2_inv_pa(start);
vaddr = l2_map_va(start, vaddr, flags);
xsc3_l2_clean_mva(vaddr);
xsc3_l2_inv_mva(vaddr);
start += CACHE_LINE_SIZE;
}
l2_map_restore_flags(flags);
dsb();
}