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linux/linux-5.18.11/arch/mips/mm/c-r4k.c

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2024-03-22 18:12:32 +00:00
/*
* 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) 1996 David S. Miller (davem@davemloft.net)
* Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002 Ralf Baechle (ralf@gnu.org)
* Copyright (C) 1999, 2000 Silicon Graphics, Inc.
*/
#include <linux/cpu_pm.h>
#include <linux/hardirq.h>
#include <linux/init.h>
#include <linux/highmem.h>
#include <linux/kernel.h>
#include <linux/linkage.h>
#include <linux/preempt.h>
#include <linux/sched.h>
#include <linux/smp.h>
#include <linux/mm.h>
#include <linux/export.h>
#include <linux/bitops.h>
#include <linux/dma-map-ops.h> /* for dma_default_coherent */
#include <asm/bcache.h>
#include <asm/bootinfo.h>
#include <asm/cache.h>
#include <asm/cacheops.h>
#include <asm/cpu.h>
#include <asm/cpu-features.h>
#include <asm/cpu-type.h>
#include <asm/io.h>
#include <asm/page.h>
#include <asm/r4kcache.h>
#include <asm/sections.h>
#include <asm/mmu_context.h>
#include <asm/cacheflush.h> /* for run_uncached() */
#include <asm/traps.h>
#include <asm/mips-cps.h>
/*
* Bits describing what cache ops an SMP callback function may perform.
*
* R4K_HIT - Virtual user or kernel address based cache operations. The
* active_mm must be checked before using user addresses, falling
* back to kmap.
* R4K_INDEX - Index based cache operations.
*/
#define R4K_HIT BIT(0)
#define R4K_INDEX BIT(1)
/**
* r4k_op_needs_ipi() - Decide if a cache op needs to be done on every core.
* @type: Type of cache operations (R4K_HIT or R4K_INDEX).
*
* Decides whether a cache op needs to be performed on every core in the system.
* This may change depending on the @type of cache operation, as well as the set
* of online CPUs, so preemption should be disabled by the caller to prevent CPU
* hotplug from changing the result.
*
* Returns: 1 if the cache operation @type should be done on every core in
* the system.
* 0 if the cache operation @type is globalized and only needs to
* be performed on a simple CPU.
*/
static inline bool r4k_op_needs_ipi(unsigned int type)
{
/* The MIPS Coherence Manager (CM) globalizes address-based cache ops */
if (type == R4K_HIT && mips_cm_present())
return false;
/*
* Hardware doesn't globalize the required cache ops, so SMP calls may
* be needed, but only if there are foreign CPUs (non-siblings with
* separate caches).
*/
/* cpu_foreign_map[] undeclared when !CONFIG_SMP */
#ifdef CONFIG_SMP
return !cpumask_empty(&cpu_foreign_map[0]);
#else
return false;
#endif
}
/*
* Special Variant of smp_call_function for use by cache functions:
*
* o No return value
* o collapses to normal function call on UP kernels
* o collapses to normal function call on systems with a single shared
* primary cache.
* o doesn't disable interrupts on the local CPU
*/
static inline void r4k_on_each_cpu(unsigned int type,
void (*func)(void *info), void *info)
{
preempt_disable();
if (r4k_op_needs_ipi(type))
smp_call_function_many(&cpu_foreign_map[smp_processor_id()],
func, info, 1);
func(info);
preempt_enable();
}
/*
* Must die.
*/
static unsigned long icache_size __read_mostly;
static unsigned long dcache_size __read_mostly;
static unsigned long vcache_size __read_mostly;
static unsigned long scache_size __read_mostly;
/*
* Dummy cache handling routines for machines without boardcaches
*/
static void cache_noop(void) {}
static struct bcache_ops no_sc_ops = {
.bc_enable = (void *)cache_noop,
.bc_disable = (void *)cache_noop,
.bc_wback_inv = (void *)cache_noop,
.bc_inv = (void *)cache_noop
};
struct bcache_ops *bcops = &no_sc_ops;
#define cpu_is_r4600_v1_x() ((read_c0_prid() & 0xfffffff0) == 0x00002010)
#define cpu_is_r4600_v2_x() ((read_c0_prid() & 0xfffffff0) == 0x00002020)
#define R4600_HIT_CACHEOP_WAR_IMPL \
do { \
if (IS_ENABLED(CONFIG_WAR_R4600_V2_HIT_CACHEOP) && \
cpu_is_r4600_v2_x()) \
*(volatile unsigned long *)CKSEG1; \
if (IS_ENABLED(CONFIG_WAR_R4600_V1_HIT_CACHEOP)) \
__asm__ __volatile__("nop;nop;nop;nop"); \
} while (0)
static void (*r4k_blast_dcache_page)(unsigned long addr);
static inline void r4k_blast_dcache_page_dc32(unsigned long addr)
{
R4600_HIT_CACHEOP_WAR_IMPL;
blast_dcache32_page(addr);
}
static inline void r4k_blast_dcache_page_dc64(unsigned long addr)
{
blast_dcache64_page(addr);
}
static inline void r4k_blast_dcache_page_dc128(unsigned long addr)
{
blast_dcache128_page(addr);
}
static void r4k_blast_dcache_page_setup(void)
{
unsigned long dc_lsize = cpu_dcache_line_size();
switch (dc_lsize) {
case 0:
r4k_blast_dcache_page = (void *)cache_noop;
break;
case 16:
r4k_blast_dcache_page = blast_dcache16_page;
break;
case 32:
r4k_blast_dcache_page = r4k_blast_dcache_page_dc32;
break;
case 64:
r4k_blast_dcache_page = r4k_blast_dcache_page_dc64;
break;
case 128:
r4k_blast_dcache_page = r4k_blast_dcache_page_dc128;
break;
default:
break;
}
}
#ifndef CONFIG_EVA
#define r4k_blast_dcache_user_page r4k_blast_dcache_page
#else
static void (*r4k_blast_dcache_user_page)(unsigned long addr);
static void r4k_blast_dcache_user_page_setup(void)
{
unsigned long dc_lsize = cpu_dcache_line_size();
if (dc_lsize == 0)
r4k_blast_dcache_user_page = (void *)cache_noop;
else if (dc_lsize == 16)
r4k_blast_dcache_user_page = blast_dcache16_user_page;
else if (dc_lsize == 32)
r4k_blast_dcache_user_page = blast_dcache32_user_page;
else if (dc_lsize == 64)
r4k_blast_dcache_user_page = blast_dcache64_user_page;
}
#endif
static void (* r4k_blast_dcache_page_indexed)(unsigned long addr);
static void r4k_blast_dcache_page_indexed_setup(void)
{
unsigned long dc_lsize = cpu_dcache_line_size();
if (dc_lsize == 0)
r4k_blast_dcache_page_indexed = (void *)cache_noop;
else if (dc_lsize == 16)
r4k_blast_dcache_page_indexed = blast_dcache16_page_indexed;
else if (dc_lsize == 32)
r4k_blast_dcache_page_indexed = blast_dcache32_page_indexed;
else if (dc_lsize == 64)
r4k_blast_dcache_page_indexed = blast_dcache64_page_indexed;
else if (dc_lsize == 128)
r4k_blast_dcache_page_indexed = blast_dcache128_page_indexed;
}
void (* r4k_blast_dcache)(void);
EXPORT_SYMBOL(r4k_blast_dcache);
static void r4k_blast_dcache_setup(void)
{
unsigned long dc_lsize = cpu_dcache_line_size();
if (dc_lsize == 0)
r4k_blast_dcache = (void *)cache_noop;
else if (dc_lsize == 16)
r4k_blast_dcache = blast_dcache16;
else if (dc_lsize == 32)
r4k_blast_dcache = blast_dcache32;
else if (dc_lsize == 64)
r4k_blast_dcache = blast_dcache64;
else if (dc_lsize == 128)
r4k_blast_dcache = blast_dcache128;
}
/* force code alignment (used for CONFIG_WAR_TX49XX_ICACHE_INDEX_INV) */
#define JUMP_TO_ALIGN(order) \
__asm__ __volatile__( \
"b\t1f\n\t" \
".align\t" #order "\n\t" \
"1:\n\t" \
)
#define CACHE32_UNROLL32_ALIGN JUMP_TO_ALIGN(10) /* 32 * 32 = 1024 */
#define CACHE32_UNROLL32_ALIGN2 JUMP_TO_ALIGN(11)
static inline void blast_r4600_v1_icache32(void)
{
unsigned long flags;
local_irq_save(flags);
blast_icache32();
local_irq_restore(flags);
}
static inline void tx49_blast_icache32(void)
{
unsigned long start = INDEX_BASE;
unsigned long end = start + current_cpu_data.icache.waysize;
unsigned long ws_inc = 1UL << current_cpu_data.icache.waybit;
unsigned long ws_end = current_cpu_data.icache.ways <<
current_cpu_data.icache.waybit;
unsigned long ws, addr;
CACHE32_UNROLL32_ALIGN2;
/* I'm in even chunk. blast odd chunks */
for (ws = 0; ws < ws_end; ws += ws_inc)
for (addr = start + 0x400; addr < end; addr += 0x400 * 2)
cache_unroll(32, kernel_cache, Index_Invalidate_I,
addr | ws, 32);
CACHE32_UNROLL32_ALIGN;
/* I'm in odd chunk. blast even chunks */
for (ws = 0; ws < ws_end; ws += ws_inc)
for (addr = start; addr < end; addr += 0x400 * 2)
cache_unroll(32, kernel_cache, Index_Invalidate_I,
addr | ws, 32);
}
static inline void blast_icache32_r4600_v1_page_indexed(unsigned long page)
{
unsigned long flags;
local_irq_save(flags);
blast_icache32_page_indexed(page);
local_irq_restore(flags);
}
static inline void tx49_blast_icache32_page_indexed(unsigned long page)
{
unsigned long indexmask = current_cpu_data.icache.waysize - 1;
unsigned long start = INDEX_BASE + (page & indexmask);
unsigned long end = start + PAGE_SIZE;
unsigned long ws_inc = 1UL << current_cpu_data.icache.waybit;
unsigned long ws_end = current_cpu_data.icache.ways <<
current_cpu_data.icache.waybit;
unsigned long ws, addr;
CACHE32_UNROLL32_ALIGN2;
/* I'm in even chunk. blast odd chunks */
for (ws = 0; ws < ws_end; ws += ws_inc)
for (addr = start + 0x400; addr < end; addr += 0x400 * 2)
cache_unroll(32, kernel_cache, Index_Invalidate_I,
addr | ws, 32);
CACHE32_UNROLL32_ALIGN;
/* I'm in odd chunk. blast even chunks */
for (ws = 0; ws < ws_end; ws += ws_inc)
for (addr = start; addr < end; addr += 0x400 * 2)
cache_unroll(32, kernel_cache, Index_Invalidate_I,
addr | ws, 32);
}
static void (* r4k_blast_icache_page)(unsigned long addr);
static void r4k_blast_icache_page_setup(void)
{
unsigned long ic_lsize = cpu_icache_line_size();
if (ic_lsize == 0)
r4k_blast_icache_page = (void *)cache_noop;
else if (ic_lsize == 16)
r4k_blast_icache_page = blast_icache16_page;
else if (ic_lsize == 32 && current_cpu_type() == CPU_LOONGSON2EF)
r4k_blast_icache_page = loongson2_blast_icache32_page;
else if (ic_lsize == 32)
r4k_blast_icache_page = blast_icache32_page;
else if (ic_lsize == 64)
r4k_blast_icache_page = blast_icache64_page;
else if (ic_lsize == 128)
r4k_blast_icache_page = blast_icache128_page;
}
#ifndef CONFIG_EVA
#define r4k_blast_icache_user_page r4k_blast_icache_page
#else
static void (*r4k_blast_icache_user_page)(unsigned long addr);
static void r4k_blast_icache_user_page_setup(void)
{
unsigned long ic_lsize = cpu_icache_line_size();
if (ic_lsize == 0)
r4k_blast_icache_user_page = (void *)cache_noop;
else if (ic_lsize == 16)
r4k_blast_icache_user_page = blast_icache16_user_page;
else if (ic_lsize == 32)
r4k_blast_icache_user_page = blast_icache32_user_page;
else if (ic_lsize == 64)
r4k_blast_icache_user_page = blast_icache64_user_page;
}
#endif
static void (* r4k_blast_icache_page_indexed)(unsigned long addr);
static void r4k_blast_icache_page_indexed_setup(void)
{
unsigned long ic_lsize = cpu_icache_line_size();
if (ic_lsize == 0)
r4k_blast_icache_page_indexed = (void *)cache_noop;
else if (ic_lsize == 16)
r4k_blast_icache_page_indexed = blast_icache16_page_indexed;
else if (ic_lsize == 32) {
if (IS_ENABLED(CONFIG_WAR_R4600_V1_INDEX_ICACHEOP) &&
cpu_is_r4600_v1_x())
r4k_blast_icache_page_indexed =
blast_icache32_r4600_v1_page_indexed;
else if (IS_ENABLED(CONFIG_WAR_TX49XX_ICACHE_INDEX_INV))
r4k_blast_icache_page_indexed =
tx49_blast_icache32_page_indexed;
else if (current_cpu_type() == CPU_LOONGSON2EF)
r4k_blast_icache_page_indexed =
loongson2_blast_icache32_page_indexed;
else
r4k_blast_icache_page_indexed =
blast_icache32_page_indexed;
} else if (ic_lsize == 64)
r4k_blast_icache_page_indexed = blast_icache64_page_indexed;
}
void (* r4k_blast_icache)(void);
EXPORT_SYMBOL(r4k_blast_icache);
static void r4k_blast_icache_setup(void)
{
unsigned long ic_lsize = cpu_icache_line_size();
if (ic_lsize == 0)
r4k_blast_icache = (void *)cache_noop;
else if (ic_lsize == 16)
r4k_blast_icache = blast_icache16;
else if (ic_lsize == 32) {
if (IS_ENABLED(CONFIG_WAR_R4600_V1_INDEX_ICACHEOP) &&
cpu_is_r4600_v1_x())
r4k_blast_icache = blast_r4600_v1_icache32;
else if (IS_ENABLED(CONFIG_WAR_TX49XX_ICACHE_INDEX_INV))
r4k_blast_icache = tx49_blast_icache32;
else if (current_cpu_type() == CPU_LOONGSON2EF)
r4k_blast_icache = loongson2_blast_icache32;
else
r4k_blast_icache = blast_icache32;
} else if (ic_lsize == 64)
r4k_blast_icache = blast_icache64;
else if (ic_lsize == 128)
r4k_blast_icache = blast_icache128;
}
static void (* r4k_blast_scache_page)(unsigned long addr);
static void r4k_blast_scache_page_setup(void)
{
unsigned long sc_lsize = cpu_scache_line_size();
if (scache_size == 0)
r4k_blast_scache_page = (void *)cache_noop;
else if (sc_lsize == 16)
r4k_blast_scache_page = blast_scache16_page;
else if (sc_lsize == 32)
r4k_blast_scache_page = blast_scache32_page;
else if (sc_lsize == 64)
r4k_blast_scache_page = blast_scache64_page;
else if (sc_lsize == 128)
r4k_blast_scache_page = blast_scache128_page;
}
static void (* r4k_blast_scache_page_indexed)(unsigned long addr);
static void r4k_blast_scache_page_indexed_setup(void)
{
unsigned long sc_lsize = cpu_scache_line_size();
if (scache_size == 0)
r4k_blast_scache_page_indexed = (void *)cache_noop;
else if (sc_lsize == 16)
r4k_blast_scache_page_indexed = blast_scache16_page_indexed;
else if (sc_lsize == 32)
r4k_blast_scache_page_indexed = blast_scache32_page_indexed;
else if (sc_lsize == 64)
r4k_blast_scache_page_indexed = blast_scache64_page_indexed;
else if (sc_lsize == 128)
r4k_blast_scache_page_indexed = blast_scache128_page_indexed;
}
static void (* r4k_blast_scache)(void);
static void r4k_blast_scache_setup(void)
{
unsigned long sc_lsize = cpu_scache_line_size();
if (scache_size == 0)
r4k_blast_scache = (void *)cache_noop;
else if (sc_lsize == 16)
r4k_blast_scache = blast_scache16;
else if (sc_lsize == 32)
r4k_blast_scache = blast_scache32;
else if (sc_lsize == 64)
r4k_blast_scache = blast_scache64;
else if (sc_lsize == 128)
r4k_blast_scache = blast_scache128;
}
static void (*r4k_blast_scache_node)(long node);
static void r4k_blast_scache_node_setup(void)
{
unsigned long sc_lsize = cpu_scache_line_size();
if (current_cpu_type() != CPU_LOONGSON64)
r4k_blast_scache_node = (void *)cache_noop;
else if (sc_lsize == 16)
r4k_blast_scache_node = blast_scache16_node;
else if (sc_lsize == 32)
r4k_blast_scache_node = blast_scache32_node;
else if (sc_lsize == 64)
r4k_blast_scache_node = blast_scache64_node;
else if (sc_lsize == 128)
r4k_blast_scache_node = blast_scache128_node;
}
static inline void local_r4k___flush_cache_all(void * args)
{
switch (current_cpu_type()) {
case CPU_LOONGSON2EF:
case CPU_R4000SC:
case CPU_R4000MC:
case CPU_R4400SC:
case CPU_R4400MC:
case CPU_R10000:
case CPU_R12000:
case CPU_R14000:
case CPU_R16000:
/*
* These caches are inclusive caches, that is, if something
* is not cached in the S-cache, we know it also won't be
* in one of the primary caches.
*/
r4k_blast_scache();
break;
case CPU_LOONGSON64:
/* Use get_ebase_cpunum() for both NUMA=y/n */
r4k_blast_scache_node(get_ebase_cpunum() >> 2);
break;
case CPU_BMIPS5000:
r4k_blast_scache();
__sync();
break;
default:
r4k_blast_dcache();
r4k_blast_icache();
break;
}
}
static void r4k___flush_cache_all(void)
{
r4k_on_each_cpu(R4K_INDEX, local_r4k___flush_cache_all, NULL);
}
/**
* has_valid_asid() - Determine if an mm already has an ASID.
* @mm: Memory map.
* @type: R4K_HIT or R4K_INDEX, type of cache op.
*
* Determines whether @mm already has an ASID on any of the CPUs which cache ops
* of type @type within an r4k_on_each_cpu() call will affect. If
* r4k_on_each_cpu() does an SMP call to a single VPE in each core, then the
* scope of the operation is confined to sibling CPUs, otherwise all online CPUs
* will need to be checked.
*
* Must be called in non-preemptive context.
*
* Returns: 1 if the CPUs affected by @type cache ops have an ASID for @mm.
* 0 otherwise.
*/
static inline int has_valid_asid(const struct mm_struct *mm, unsigned int type)
{
unsigned int i;
const cpumask_t *mask = cpu_present_mask;
if (cpu_has_mmid)
return cpu_context(0, mm) != 0;
/* cpu_sibling_map[] undeclared when !CONFIG_SMP */
#ifdef CONFIG_SMP
/*
* If r4k_on_each_cpu does SMP calls, it does them to a single VPE in
* each foreign core, so we only need to worry about siblings.
* Otherwise we need to worry about all present CPUs.
*/
if (r4k_op_needs_ipi(type))
mask = &cpu_sibling_map[smp_processor_id()];
#endif
for_each_cpu(i, mask)
if (cpu_context(i, mm))
return 1;
return 0;
}
static void r4k__flush_cache_vmap(void)
{
r4k_blast_dcache();
}
static void r4k__flush_cache_vunmap(void)
{
r4k_blast_dcache();
}
/*
* Note: flush_tlb_range() assumes flush_cache_range() sufficiently flushes
* whole caches when vma is executable.
*/
static inline void local_r4k_flush_cache_range(void * args)
{
struct vm_area_struct *vma = args;
int exec = vma->vm_flags & VM_EXEC;
if (!has_valid_asid(vma->vm_mm, R4K_INDEX))
return;
/*
* If dcache can alias, we must blast it since mapping is changing.
* If executable, we must ensure any dirty lines are written back far
* enough to be visible to icache.
*/
if (cpu_has_dc_aliases || (exec && !cpu_has_ic_fills_f_dc))
r4k_blast_dcache();
/* If executable, blast stale lines from icache */
if (exec)
r4k_blast_icache();
}
static void r4k_flush_cache_range(struct vm_area_struct *vma,
unsigned long start, unsigned long end)
{
int exec = vma->vm_flags & VM_EXEC;
if (cpu_has_dc_aliases || exec)
r4k_on_each_cpu(R4K_INDEX, local_r4k_flush_cache_range, vma);
}
static inline void local_r4k_flush_cache_mm(void * args)
{
struct mm_struct *mm = args;
if (!has_valid_asid(mm, R4K_INDEX))
return;
/*
* Kludge alert. For obscure reasons R4000SC and R4400SC go nuts if we
* only flush the primary caches but R1x000 behave sane ...
* R4000SC and R4400SC indexed S-cache ops also invalidate primary
* caches, so we can bail out early.
*/
if (current_cpu_type() == CPU_R4000SC ||
current_cpu_type() == CPU_R4000MC ||
current_cpu_type() == CPU_R4400SC ||
current_cpu_type() == CPU_R4400MC) {
r4k_blast_scache();
return;
}
r4k_blast_dcache();
}
static void r4k_flush_cache_mm(struct mm_struct *mm)
{
if (!cpu_has_dc_aliases)
return;
r4k_on_each_cpu(R4K_INDEX, local_r4k_flush_cache_mm, mm);
}
struct flush_cache_page_args {
struct vm_area_struct *vma;
unsigned long addr;
unsigned long pfn;
};
static inline void local_r4k_flush_cache_page(void *args)
{
struct flush_cache_page_args *fcp_args = args;
struct vm_area_struct *vma = fcp_args->vma;
unsigned long addr = fcp_args->addr;
struct page *page = pfn_to_page(fcp_args->pfn);
int exec = vma->vm_flags & VM_EXEC;
struct mm_struct *mm = vma->vm_mm;
int map_coherent = 0;
pmd_t *pmdp;
pte_t *ptep;
void *vaddr;
/*
* If owns no valid ASID yet, cannot possibly have gotten
* this page into the cache.
*/
if (!has_valid_asid(mm, R4K_HIT))
return;
addr &= PAGE_MASK;
pmdp = pmd_off(mm, addr);
ptep = pte_offset_kernel(pmdp, addr);
/*
* If the page isn't marked valid, the page cannot possibly be
* in the cache.
*/
if (!(pte_present(*ptep)))
return;
if ((mm == current->active_mm) && (pte_val(*ptep) & _PAGE_VALID))
vaddr = NULL;
else {
/*
* Use kmap_coherent or kmap_atomic to do flushes for
* another ASID than the current one.
*/
map_coherent = (cpu_has_dc_aliases &&
page_mapcount(page) &&
!Page_dcache_dirty(page));
if (map_coherent)
vaddr = kmap_coherent(page, addr);
else
vaddr = kmap_atomic(page);
addr = (unsigned long)vaddr;
}
if (cpu_has_dc_aliases || (exec && !cpu_has_ic_fills_f_dc)) {
vaddr ? r4k_blast_dcache_page(addr) :
r4k_blast_dcache_user_page(addr);
if (exec && !cpu_icache_snoops_remote_store)
r4k_blast_scache_page(addr);
}
if (exec) {
if (vaddr && cpu_has_vtag_icache && mm == current->active_mm) {
drop_mmu_context(mm);
} else
vaddr ? r4k_blast_icache_page(addr) :
r4k_blast_icache_user_page(addr);
}
if (vaddr) {
if (map_coherent)
kunmap_coherent();
else
kunmap_atomic(vaddr);
}
}
static void r4k_flush_cache_page(struct vm_area_struct *vma,
unsigned long addr, unsigned long pfn)
{
struct flush_cache_page_args args;
args.vma = vma;
args.addr = addr;
args.pfn = pfn;
r4k_on_each_cpu(R4K_HIT, local_r4k_flush_cache_page, &args);
}
static inline void local_r4k_flush_data_cache_page(void * addr)
{
r4k_blast_dcache_page((unsigned long) addr);
}
static void r4k_flush_data_cache_page(unsigned long addr)
{
if (in_atomic())
local_r4k_flush_data_cache_page((void *)addr);
else
r4k_on_each_cpu(R4K_HIT, local_r4k_flush_data_cache_page,
(void *) addr);
}
struct flush_icache_range_args {
unsigned long start;
unsigned long end;
unsigned int type;
bool user;
};
static inline void __local_r4k_flush_icache_range(unsigned long start,
unsigned long end,
unsigned int type,
bool user)
{
if (!cpu_has_ic_fills_f_dc) {
if (type == R4K_INDEX ||
(type & R4K_INDEX && end - start >= dcache_size)) {
r4k_blast_dcache();
} else {
R4600_HIT_CACHEOP_WAR_IMPL;
if (user)
protected_blast_dcache_range(start, end);
else
blast_dcache_range(start, end);
}
}
if (type == R4K_INDEX ||
(type & R4K_INDEX && end - start > icache_size))
r4k_blast_icache();
else {
switch (boot_cpu_type()) {
case CPU_LOONGSON2EF:
protected_loongson2_blast_icache_range(start, end);
break;
default:
if (user)
protected_blast_icache_range(start, end);
else
blast_icache_range(start, end);
break;
}
}
}
static inline void local_r4k_flush_icache_range(unsigned long start,
unsigned long end)
{
__local_r4k_flush_icache_range(start, end, R4K_HIT | R4K_INDEX, false);
}
static inline void local_r4k_flush_icache_user_range(unsigned long start,
unsigned long end)
{
__local_r4k_flush_icache_range(start, end, R4K_HIT | R4K_INDEX, true);
}
static inline void local_r4k_flush_icache_range_ipi(void *args)
{
struct flush_icache_range_args *fir_args = args;
unsigned long start = fir_args->start;
unsigned long end = fir_args->end;
unsigned int type = fir_args->type;
bool user = fir_args->user;
__local_r4k_flush_icache_range(start, end, type, user);
}
static void __r4k_flush_icache_range(unsigned long start, unsigned long end,
bool user)
{
struct flush_icache_range_args args;
unsigned long size, cache_size;
args.start = start;
args.end = end;
args.type = R4K_HIT | R4K_INDEX;
args.user = user;
/*
* Indexed cache ops require an SMP call.
* Consider if that can or should be avoided.
*/
preempt_disable();
if (r4k_op_needs_ipi(R4K_INDEX) && !r4k_op_needs_ipi(R4K_HIT)) {
/*
* If address-based cache ops don't require an SMP call, then
* use them exclusively for small flushes.
*/
size = end - start;
cache_size = icache_size;
if (!cpu_has_ic_fills_f_dc) {
size *= 2;
cache_size += dcache_size;
}
if (size <= cache_size)
args.type &= ~R4K_INDEX;
}
r4k_on_each_cpu(args.type, local_r4k_flush_icache_range_ipi, &args);
preempt_enable();
instruction_hazard();
}
static void r4k_flush_icache_range(unsigned long start, unsigned long end)
{
return __r4k_flush_icache_range(start, end, false);
}
static void r4k_flush_icache_user_range(unsigned long start, unsigned long end)
{
return __r4k_flush_icache_range(start, end, true);
}
#ifdef CONFIG_DMA_NONCOHERENT
static void r4k_dma_cache_wback_inv(unsigned long addr, unsigned long size)
{
/* Catch bad driver code */
if (WARN_ON(size == 0))
return;
preempt_disable();
if (cpu_has_inclusive_pcaches) {
if (size >= scache_size) {
if (current_cpu_type() != CPU_LOONGSON64)
r4k_blast_scache();
else
r4k_blast_scache_node(pa_to_nid(addr));
} else {
blast_scache_range(addr, addr + size);
}
preempt_enable();
__sync();
return;
}
/*
* Either no secondary cache or the available caches don't have the
* subset property so we have to flush the primary caches
* explicitly.
* If we would need IPI to perform an INDEX-type operation, then
* we have to use the HIT-type alternative as IPI cannot be used
* here due to interrupts possibly being disabled.
*/
if (!r4k_op_needs_ipi(R4K_INDEX) && size >= dcache_size) {
r4k_blast_dcache();
} else {
R4600_HIT_CACHEOP_WAR_IMPL;
blast_dcache_range(addr, addr + size);
}
preempt_enable();
bc_wback_inv(addr, size);
__sync();
}
static void prefetch_cache_inv(unsigned long addr, unsigned long size)
{
unsigned int linesz = cpu_scache_line_size();
unsigned long addr0 = addr, addr1;
addr0 &= ~(linesz - 1);
addr1 = (addr0 + size - 1) & ~(linesz - 1);
protected_writeback_scache_line(addr0);
if (likely(addr1 != addr0))
protected_writeback_scache_line(addr1);
else
return;
addr0 += linesz;
if (likely(addr1 != addr0))
protected_writeback_scache_line(addr0);
else
return;
addr1 -= linesz;
if (likely(addr1 > addr0))
protected_writeback_scache_line(addr0);
}
static void r4k_dma_cache_inv(unsigned long addr, unsigned long size)
{
/* Catch bad driver code */
if (WARN_ON(size == 0))
return;
preempt_disable();
if (current_cpu_type() == CPU_BMIPS5000)
prefetch_cache_inv(addr, size);
if (cpu_has_inclusive_pcaches) {
if (size >= scache_size) {
if (current_cpu_type() != CPU_LOONGSON64)
r4k_blast_scache();
else
r4k_blast_scache_node(pa_to_nid(addr));
} else {
/*
* There is no clearly documented alignment requirement
* for the cache instruction on MIPS processors and
* some processors, among them the RM5200 and RM7000
* QED processors will throw an address error for cache
* hit ops with insufficient alignment. Solved by
* aligning the address to cache line size.
*/
blast_inv_scache_range(addr, addr + size);
}
preempt_enable();
__sync();
return;
}
if (!r4k_op_needs_ipi(R4K_INDEX) && size >= dcache_size) {
r4k_blast_dcache();
} else {
R4600_HIT_CACHEOP_WAR_IMPL;
blast_inv_dcache_range(addr, addr + size);
}
preempt_enable();
bc_inv(addr, size);
__sync();
}
#endif /* CONFIG_DMA_NONCOHERENT */
static void r4k_flush_icache_all(void)
{
if (cpu_has_vtag_icache)
r4k_blast_icache();
}
struct flush_kernel_vmap_range_args {
unsigned long vaddr;
int size;
};
static inline void local_r4k_flush_kernel_vmap_range_index(void *args)
{
/*
* Aliases only affect the primary caches so don't bother with
* S-caches or T-caches.
*/
r4k_blast_dcache();
}
static inline void local_r4k_flush_kernel_vmap_range(void *args)
{
struct flush_kernel_vmap_range_args *vmra = args;
unsigned long vaddr = vmra->vaddr;
int size = vmra->size;
/*
* Aliases only affect the primary caches so don't bother with
* S-caches or T-caches.
*/
R4600_HIT_CACHEOP_WAR_IMPL;
blast_dcache_range(vaddr, vaddr + size);
}
static void r4k_flush_kernel_vmap_range(unsigned long vaddr, int size)
{
struct flush_kernel_vmap_range_args args;
args.vaddr = (unsigned long) vaddr;
args.size = size;
if (size >= dcache_size)
r4k_on_each_cpu(R4K_INDEX,
local_r4k_flush_kernel_vmap_range_index, NULL);
else
r4k_on_each_cpu(R4K_HIT, local_r4k_flush_kernel_vmap_range,
&args);
}
static inline void rm7k_erratum31(void)
{
const unsigned long ic_lsize = 32;
unsigned long addr;
/* RM7000 erratum #31. The icache is screwed at startup. */
write_c0_taglo(0);
write_c0_taghi(0);
for (addr = INDEX_BASE; addr <= INDEX_BASE + 4096; addr += ic_lsize) {
__asm__ __volatile__ (
".set push\n\t"
".set noreorder\n\t"
".set mips3\n\t"
"cache\t%1, 0(%0)\n\t"
"cache\t%1, 0x1000(%0)\n\t"
"cache\t%1, 0x2000(%0)\n\t"
"cache\t%1, 0x3000(%0)\n\t"
"cache\t%2, 0(%0)\n\t"
"cache\t%2, 0x1000(%0)\n\t"
"cache\t%2, 0x2000(%0)\n\t"
"cache\t%2, 0x3000(%0)\n\t"
"cache\t%1, 0(%0)\n\t"
"cache\t%1, 0x1000(%0)\n\t"
"cache\t%1, 0x2000(%0)\n\t"
"cache\t%1, 0x3000(%0)\n\t"
".set pop\n"
:
: "r" (addr), "i" (Index_Store_Tag_I), "i" (Fill_I));
}
}
static inline int alias_74k_erratum(struct cpuinfo_mips *c)
{
unsigned int imp = c->processor_id & PRID_IMP_MASK;
unsigned int rev = c->processor_id & PRID_REV_MASK;
int present = 0;
/*
* Early versions of the 74K do not update the cache tags on a
* vtag miss/ptag hit which can occur in the case of KSEG0/KUSEG
* aliases. In this case it is better to treat the cache as always
* having aliases. Also disable the synonym tag update feature
* where available. In this case no opportunistic tag update will
* happen where a load causes a virtual address miss but a physical
* address hit during a D-cache look-up.
*/
switch (imp) {
case PRID_IMP_74K:
if (rev <= PRID_REV_ENCODE_332(2, 4, 0))
present = 1;
if (rev == PRID_REV_ENCODE_332(2, 4, 0))
write_c0_config6(read_c0_config6() | MTI_CONF6_SYND);
break;
case PRID_IMP_1074K:
if (rev <= PRID_REV_ENCODE_332(1, 1, 0)) {
present = 1;
write_c0_config6(read_c0_config6() | MTI_CONF6_SYND);
}
break;
default:
BUG();
}
return present;
}
static void b5k_instruction_hazard(void)
{
__sync();
__sync();
__asm__ __volatile__(
" nop; nop; nop; nop; nop; nop; nop; nop\n"
" nop; nop; nop; nop; nop; nop; nop; nop\n"
" nop; nop; nop; nop; nop; nop; nop; nop\n"
" nop; nop; nop; nop; nop; nop; nop; nop\n"
: : : "memory");
}
static char *way_string[] = { NULL, "direct mapped", "2-way",
"3-way", "4-way", "5-way", "6-way", "7-way", "8-way",
"9-way", "10-way", "11-way", "12-way",
"13-way", "14-way", "15-way", "16-way",
};
static void probe_pcache(void)
{
struct cpuinfo_mips *c = &current_cpu_data;
unsigned int config = read_c0_config();
unsigned int prid = read_c0_prid();
int has_74k_erratum = 0;
unsigned long config1;
unsigned int lsize;
switch (current_cpu_type()) {
case CPU_R4600: /* QED style two way caches? */
case CPU_R4700:
case CPU_R5000:
case CPU_NEVADA:
icache_size = 1 << (12 + ((config & CONF_IC) >> 9));
c->icache.linesz = 16 << ((config & CONF_IB) >> 5);
c->icache.ways = 2;
c->icache.waybit = __ffs(icache_size/2);
dcache_size = 1 << (12 + ((config & CONF_DC) >> 6));
c->dcache.linesz = 16 << ((config & CONF_DB) >> 4);
c->dcache.ways = 2;
c->dcache.waybit= __ffs(dcache_size/2);
c->options |= MIPS_CPU_CACHE_CDEX_P;
break;
case CPU_R5500:
icache_size = 1 << (12 + ((config & CONF_IC) >> 9));
c->icache.linesz = 16 << ((config & CONF_IB) >> 5);
c->icache.ways = 2;
c->icache.waybit= 0;
dcache_size = 1 << (12 + ((config & CONF_DC) >> 6));
c->dcache.linesz = 16 << ((config & CONF_DB) >> 4);
c->dcache.ways = 2;
c->dcache.waybit = 0;
c->options |= MIPS_CPU_CACHE_CDEX_P | MIPS_CPU_PREFETCH;
break;
case CPU_TX49XX:
icache_size = 1 << (12 + ((config & CONF_IC) >> 9));
c->icache.linesz = 16 << ((config & CONF_IB) >> 5);
c->icache.ways = 4;
c->icache.waybit= 0;
dcache_size = 1 << (12 + ((config & CONF_DC) >> 6));
c->dcache.linesz = 16 << ((config & CONF_DB) >> 4);
c->dcache.ways = 4;
c->dcache.waybit = 0;
c->options |= MIPS_CPU_CACHE_CDEX_P;
c->options |= MIPS_CPU_PREFETCH;
break;
case CPU_R4000PC:
case CPU_R4000SC:
case CPU_R4000MC:
case CPU_R4400PC:
case CPU_R4400SC:
case CPU_R4400MC:
case CPU_R4300:
icache_size = 1 << (12 + ((config & CONF_IC) >> 9));
c->icache.linesz = 16 << ((config & CONF_IB) >> 5);
c->icache.ways = 1;
c->icache.waybit = 0; /* doesn't matter */
dcache_size = 1 << (12 + ((config & CONF_DC) >> 6));
c->dcache.linesz = 16 << ((config & CONF_DB) >> 4);
c->dcache.ways = 1;
c->dcache.waybit = 0; /* does not matter */
c->options |= MIPS_CPU_CACHE_CDEX_P;
break;
case CPU_R10000:
case CPU_R12000:
case CPU_R14000:
case CPU_R16000:
icache_size = 1 << (12 + ((config & R10K_CONF_IC) >> 29));
c->icache.linesz = 64;
c->icache.ways = 2;
c->icache.waybit = 0;
dcache_size = 1 << (12 + ((config & R10K_CONF_DC) >> 26));
c->dcache.linesz = 32;
c->dcache.ways = 2;
c->dcache.waybit = 0;
c->options |= MIPS_CPU_PREFETCH;
break;
case CPU_VR4133:
write_c0_config(config & ~VR41_CONF_P4K);
fallthrough;
case CPU_VR4131:
/* Workaround for cache instruction bug of VR4131 */
if (c->processor_id == 0x0c80U || c->processor_id == 0x0c81U ||
c->processor_id == 0x0c82U) {
config |= 0x00400000U;
if (c->processor_id == 0x0c80U)
config |= VR41_CONF_BP;
write_c0_config(config);
} else
c->options |= MIPS_CPU_CACHE_CDEX_P;
icache_size = 1 << (10 + ((config & CONF_IC) >> 9));
c->icache.linesz = 16 << ((config & CONF_IB) >> 5);
c->icache.ways = 2;
c->icache.waybit = __ffs(icache_size/2);
dcache_size = 1 << (10 + ((config & CONF_DC) >> 6));
c->dcache.linesz = 16 << ((config & CONF_DB) >> 4);
c->dcache.ways = 2;
c->dcache.waybit = __ffs(dcache_size/2);
break;
case CPU_VR41XX:
case CPU_VR4111:
case CPU_VR4121:
case CPU_VR4122:
case CPU_VR4181:
case CPU_VR4181A:
icache_size = 1 << (10 + ((config & CONF_IC) >> 9));
c->icache.linesz = 16 << ((config & CONF_IB) >> 5);
c->icache.ways = 1;
c->icache.waybit = 0; /* doesn't matter */
dcache_size = 1 << (10 + ((config & CONF_DC) >> 6));
c->dcache.linesz = 16 << ((config & CONF_DB) >> 4);
c->dcache.ways = 1;
c->dcache.waybit = 0; /* does not matter */
c->options |= MIPS_CPU_CACHE_CDEX_P;
break;
case CPU_RM7000:
rm7k_erratum31();
icache_size = 1 << (12 + ((config & CONF_IC) >> 9));
c->icache.linesz = 16 << ((config & CONF_IB) >> 5);
c->icache.ways = 4;
c->icache.waybit = __ffs(icache_size / c->icache.ways);
dcache_size = 1 << (12 + ((config & CONF_DC) >> 6));
c->dcache.linesz = 16 << ((config & CONF_DB) >> 4);
c->dcache.ways = 4;
c->dcache.waybit = __ffs(dcache_size / c->dcache.ways);
c->options |= MIPS_CPU_CACHE_CDEX_P;
c->options |= MIPS_CPU_PREFETCH;
break;
case CPU_LOONGSON2EF:
icache_size = 1 << (12 + ((config & CONF_IC) >> 9));
c->icache.linesz = 16 << ((config & CONF_IB) >> 5);
if (prid & 0x3)
c->icache.ways = 4;
else
c->icache.ways = 2;
c->icache.waybit = 0;
dcache_size = 1 << (12 + ((config & CONF_DC) >> 6));
c->dcache.linesz = 16 << ((config & CONF_DB) >> 4);
if (prid & 0x3)
c->dcache.ways = 4;
else
c->dcache.ways = 2;
c->dcache.waybit = 0;
break;
case CPU_LOONGSON64:
config1 = read_c0_config1();
lsize = (config1 >> 19) & 7;
if (lsize)
c->icache.linesz = 2 << lsize;
else
c->icache.linesz = 0;
c->icache.sets = 64 << ((config1 >> 22) & 7);
c->icache.ways = 1 + ((config1 >> 16) & 7);
icache_size = c->icache.sets *
c->icache.ways *
c->icache.linesz;
c->icache.waybit = 0;
lsize = (config1 >> 10) & 7;
if (lsize)
c->dcache.linesz = 2 << lsize;
else
c->dcache.linesz = 0;
c->dcache.sets = 64 << ((config1 >> 13) & 7);
c->dcache.ways = 1 + ((config1 >> 7) & 7);
dcache_size = c->dcache.sets *
c->dcache.ways *
c->dcache.linesz;
c->dcache.waybit = 0;
if ((c->processor_id & (PRID_IMP_MASK | PRID_REV_MASK)) >=
(PRID_IMP_LOONGSON_64C | PRID_REV_LOONGSON3A_R2_0) ||
(c->processor_id & PRID_IMP_MASK) == PRID_IMP_LOONGSON_64R)
c->options |= MIPS_CPU_PREFETCH;
break;
case CPU_CAVIUM_OCTEON3:
/* For now lie about the number of ways. */
c->icache.linesz = 128;
c->icache.sets = 16;
c->icache.ways = 8;
c->icache.flags |= MIPS_CACHE_VTAG;
icache_size = c->icache.sets * c->icache.ways * c->icache.linesz;
c->dcache.linesz = 128;
c->dcache.ways = 8;
c->dcache.sets = 8;
dcache_size = c->dcache.sets * c->dcache.ways * c->dcache.linesz;
c->options |= MIPS_CPU_PREFETCH;
break;
default:
if (!(config & MIPS_CONF_M))
panic("Don't know how to probe P-caches on this cpu.");
/*
* So we seem to be a MIPS32 or MIPS64 CPU
* So let's probe the I-cache ...
*/
config1 = read_c0_config1();
lsize = (config1 >> 19) & 7;
/* IL == 7 is reserved */
if (lsize == 7)
panic("Invalid icache line size");
c->icache.linesz = lsize ? 2 << lsize : 0;
c->icache.sets = 32 << (((config1 >> 22) + 1) & 7);
c->icache.ways = 1 + ((config1 >> 16) & 7);
icache_size = c->icache.sets *
c->icache.ways *
c->icache.linesz;
c->icache.waybit = __ffs(icache_size/c->icache.ways);
if (config & MIPS_CONF_VI)
c->icache.flags |= MIPS_CACHE_VTAG;
/*
* Now probe the MIPS32 / MIPS64 data cache.
*/
c->dcache.flags = 0;
lsize = (config1 >> 10) & 7;
/* DL == 7 is reserved */
if (lsize == 7)
panic("Invalid dcache line size");
c->dcache.linesz = lsize ? 2 << lsize : 0;
c->dcache.sets = 32 << (((config1 >> 13) + 1) & 7);
c->dcache.ways = 1 + ((config1 >> 7) & 7);
dcache_size = c->dcache.sets *
c->dcache.ways *
c->dcache.linesz;
c->dcache.waybit = __ffs(dcache_size/c->dcache.ways);
c->options |= MIPS_CPU_PREFETCH;
break;
}
/*
* Processor configuration sanity check for the R4000SC erratum
* #5. With page sizes larger than 32kB there is no possibility
* to get a VCE exception anymore so we don't care about this
* misconfiguration. The case is rather theoretical anyway;
* presumably no vendor is shipping his hardware in the "bad"
* configuration.
*/
if ((prid & PRID_IMP_MASK) == PRID_IMP_R4000 &&
(prid & PRID_REV_MASK) < PRID_REV_R4400 &&
!(config & CONF_SC) && c->icache.linesz != 16 &&
PAGE_SIZE <= 0x8000)
panic("Improper R4000SC processor configuration detected");
/* compute a couple of other cache variables */
c->icache.waysize = icache_size / c->icache.ways;
c->dcache.waysize = dcache_size / c->dcache.ways;
c->icache.sets = c->icache.linesz ?
icache_size / (c->icache.linesz * c->icache.ways) : 0;
c->dcache.sets = c->dcache.linesz ?
dcache_size / (c->dcache.linesz * c->dcache.ways) : 0;
/*
* R1x000 P-caches are odd in a positive way. They're 32kB 2-way
* virtually indexed so normally would suffer from aliases. So
* normally they'd suffer from aliases but magic in the hardware deals
* with that for us so we don't need to take care ourselves.
*/
switch (current_cpu_type()) {
case CPU_20KC:
case CPU_25KF:
case CPU_I6400:
case CPU_I6500:
case CPU_SB1:
case CPU_SB1A:
c->dcache.flags |= MIPS_CACHE_PINDEX;
break;
case CPU_R10000:
case CPU_R12000:
case CPU_R14000:
case CPU_R16000:
break;
case CPU_74K:
case CPU_1074K:
has_74k_erratum = alias_74k_erratum(c);
fallthrough;
case CPU_M14KC:
case CPU_M14KEC:
case CPU_24K:
case CPU_34K:
case CPU_1004K:
case CPU_INTERAPTIV:
case CPU_P5600:
case CPU_PROAPTIV:
case CPU_M5150:
case CPU_QEMU_GENERIC:
case CPU_P6600:
case CPU_M6250:
if (!(read_c0_config7() & MIPS_CONF7_IAR) &&
(c->icache.waysize > PAGE_SIZE))
c->icache.flags |= MIPS_CACHE_ALIASES;
if (!has_74k_erratum && (read_c0_config7() & MIPS_CONF7_AR)) {
/*
* Effectively physically indexed dcache,
* thus no virtual aliases.
*/
c->dcache.flags |= MIPS_CACHE_PINDEX;
break;
}
fallthrough;
default:
if (has_74k_erratum || c->dcache.waysize > PAGE_SIZE)
c->dcache.flags |= MIPS_CACHE_ALIASES;
}
/* Physically indexed caches don't suffer from virtual aliasing */
if (c->dcache.flags & MIPS_CACHE_PINDEX)
c->dcache.flags &= ~MIPS_CACHE_ALIASES;
/*
* In systems with CM the icache fills from L2 or closer caches, and
* thus sees remote stores without needing to write them back any
* further than that.
*/
if (mips_cm_present())
c->icache.flags |= MIPS_IC_SNOOPS_REMOTE;
switch (current_cpu_type()) {
case CPU_20KC:
/*
* Some older 20Kc chips doesn't have the 'VI' bit in
* the config register.
*/
c->icache.flags |= MIPS_CACHE_VTAG;
break;
case CPU_ALCHEMY:
case CPU_I6400:
case CPU_I6500:
c->icache.flags |= MIPS_CACHE_IC_F_DC;
break;
case CPU_BMIPS5000:
c->icache.flags |= MIPS_CACHE_IC_F_DC;
/* Cache aliases are handled in hardware; allow HIGHMEM */
c->dcache.flags &= ~MIPS_CACHE_ALIASES;
break;
case CPU_LOONGSON2EF:
/*
* LOONGSON2 has 4 way icache, but when using indexed cache op,
* one op will act on all 4 ways
*/
c->icache.ways = 1;
}
pr_info("Primary instruction cache %ldkB, %s, %s, linesize %d bytes.\n",
icache_size >> 10,
c->icache.flags & MIPS_CACHE_VTAG ? "VIVT" : "VIPT",
way_string[c->icache.ways], c->icache.linesz);
pr_info("Primary data cache %ldkB, %s, %s, %s, linesize %d bytes\n",
dcache_size >> 10, way_string[c->dcache.ways],
(c->dcache.flags & MIPS_CACHE_PINDEX) ? "PIPT" : "VIPT",
(c->dcache.flags & MIPS_CACHE_ALIASES) ?
"cache aliases" : "no aliases",
c->dcache.linesz);
}
static void probe_vcache(void)
{
struct cpuinfo_mips *c = &current_cpu_data;
unsigned int config2, lsize;
if (current_cpu_type() != CPU_LOONGSON64)
return;
config2 = read_c0_config2();
if ((lsize = ((config2 >> 20) & 15)))
c->vcache.linesz = 2 << lsize;
else
c->vcache.linesz = lsize;
c->vcache.sets = 64 << ((config2 >> 24) & 15);
c->vcache.ways = 1 + ((config2 >> 16) & 15);
vcache_size = c->vcache.sets * c->vcache.ways * c->vcache.linesz;
c->vcache.waybit = 0;
c->vcache.waysize = vcache_size / c->vcache.ways;
pr_info("Unified victim cache %ldkB %s, linesize %d bytes.\n",
vcache_size >> 10, way_string[c->vcache.ways], c->vcache.linesz);
}
/*
* If you even _breathe_ on this function, look at the gcc output and make sure
* it does not pop things on and off the stack for the cache sizing loop that
* executes in KSEG1 space or else you will crash and burn badly. You have
* been warned.
*/
static int probe_scache(void)
{
unsigned long flags, addr, begin, end, pow2;
unsigned int config = read_c0_config();
struct cpuinfo_mips *c = &current_cpu_data;
if (config & CONF_SC)
return 0;
begin = (unsigned long) &_stext;
begin &= ~((4 * 1024 * 1024) - 1);
end = begin + (4 * 1024 * 1024);
/*
* This is such a bitch, you'd think they would make it easy to do
* this. Away you daemons of stupidity!
*/
local_irq_save(flags);
/* Fill each size-multiple cache line with a valid tag. */
pow2 = (64 * 1024);
for (addr = begin; addr < end; addr = (begin + pow2)) {
unsigned long *p = (unsigned long *) addr;
__asm__ __volatile__("nop" : : "r" (*p)); /* whee... */
pow2 <<= 1;
}
/* Load first line with zero (therefore invalid) tag. */
write_c0_taglo(0);
write_c0_taghi(0);
__asm__ __volatile__("nop; nop; nop; nop;"); /* avoid the hazard */
cache_op(Index_Store_Tag_I, begin);
cache_op(Index_Store_Tag_D, begin);
cache_op(Index_Store_Tag_SD, begin);
/* Now search for the wrap around point. */
pow2 = (128 * 1024);
for (addr = begin + (128 * 1024); addr < end; addr = begin + pow2) {
cache_op(Index_Load_Tag_SD, addr);
__asm__ __volatile__("nop; nop; nop; nop;"); /* hazard... */
if (!read_c0_taglo())
break;
pow2 <<= 1;
}
local_irq_restore(flags);
addr -= begin;
scache_size = addr;
c->scache.linesz = 16 << ((config & R4K_CONF_SB) >> 22);
c->scache.ways = 1;
c->scache.waybit = 0; /* does not matter */
return 1;
}
static void loongson2_sc_init(void)
{
struct cpuinfo_mips *c = &current_cpu_data;
scache_size = 512*1024;
c->scache.linesz = 32;
c->scache.ways = 4;
c->scache.waybit = 0;
c->scache.waysize = scache_size / (c->scache.ways);
c->scache.sets = scache_size / (c->scache.linesz * c->scache.ways);
pr_info("Unified secondary cache %ldkB %s, linesize %d bytes.\n",
scache_size >> 10, way_string[c->scache.ways], c->scache.linesz);
c->options |= MIPS_CPU_INCLUSIVE_CACHES;
}
static void loongson3_sc_init(void)
{
struct cpuinfo_mips *c = &current_cpu_data;
unsigned int config2, lsize;
config2 = read_c0_config2();
lsize = (config2 >> 4) & 15;
if (lsize)
c->scache.linesz = 2 << lsize;
else
c->scache.linesz = 0;
c->scache.sets = 64 << ((config2 >> 8) & 15);
c->scache.ways = 1 + (config2 & 15);
/* Loongson-3 has 4-Scache banks, while Loongson-2K have only 2 banks */
if ((c->processor_id & PRID_IMP_MASK) == PRID_IMP_LOONGSON_64R)
c->scache.sets *= 2;
else
c->scache.sets *= 4;
scache_size = c->scache.sets * c->scache.ways * c->scache.linesz;
c->scache.waybit = 0;
c->scache.waysize = scache_size / c->scache.ways;
pr_info("Unified secondary cache %ldkB %s, linesize %d bytes.\n",
scache_size >> 10, way_string[c->scache.ways], c->scache.linesz);
if (scache_size)
c->options |= MIPS_CPU_INCLUSIVE_CACHES;
return;
}
extern int r5k_sc_init(void);
extern int rm7k_sc_init(void);
extern int mips_sc_init(void);
static void setup_scache(void)
{
struct cpuinfo_mips *c = &current_cpu_data;
unsigned int config = read_c0_config();
int sc_present = 0;
/*
* Do the probing thing on R4000SC and R4400SC processors. Other
* processors don't have a S-cache that would be relevant to the
* Linux memory management.
*/
switch (current_cpu_type()) {
case CPU_R4000SC:
case CPU_R4000MC:
case CPU_R4400SC:
case CPU_R4400MC:
sc_present = run_uncached(probe_scache);
if (sc_present)
c->options |= MIPS_CPU_CACHE_CDEX_S;
break;
case CPU_R10000:
case CPU_R12000:
case CPU_R14000:
case CPU_R16000:
scache_size = 0x80000 << ((config & R10K_CONF_SS) >> 16);
c->scache.linesz = 64 << ((config >> 13) & 1);
c->scache.ways = 2;
c->scache.waybit= 0;
sc_present = 1;
break;
case CPU_R5000:
case CPU_NEVADA:
#ifdef CONFIG_R5000_CPU_SCACHE
r5k_sc_init();
#endif
return;
case CPU_RM7000:
#ifdef CONFIG_RM7000_CPU_SCACHE
rm7k_sc_init();
#endif
return;
case CPU_LOONGSON2EF:
loongson2_sc_init();
return;
case CPU_LOONGSON64:
loongson3_sc_init();
return;
case CPU_CAVIUM_OCTEON3:
/* don't need to worry about L2, fully coherent */
return;
default:
if (c->isa_level & (MIPS_CPU_ISA_M32R1 | MIPS_CPU_ISA_M64R1 |
MIPS_CPU_ISA_M32R2 | MIPS_CPU_ISA_M64R2 |
MIPS_CPU_ISA_M32R5 | MIPS_CPU_ISA_M64R5 |
MIPS_CPU_ISA_M32R6 | MIPS_CPU_ISA_M64R6)) {
#ifdef CONFIG_MIPS_CPU_SCACHE
if (mips_sc_init ()) {
scache_size = c->scache.ways * c->scache.sets * c->scache.linesz;
printk("MIPS secondary cache %ldkB, %s, linesize %d bytes.\n",
scache_size >> 10,
way_string[c->scache.ways], c->scache.linesz);
if (current_cpu_type() == CPU_BMIPS5000)
c->options |= MIPS_CPU_INCLUSIVE_CACHES;
}
#else
if (!(c->scache.flags & MIPS_CACHE_NOT_PRESENT))
panic("Dunno how to handle MIPS32 / MIPS64 second level cache");
#endif
return;
}
sc_present = 0;
}
if (!sc_present)
return;
/* compute a couple of other cache variables */
c->scache.waysize = scache_size / c->scache.ways;
c->scache.sets = scache_size / (c->scache.linesz * c->scache.ways);
printk("Unified secondary cache %ldkB %s, linesize %d bytes.\n",
scache_size >> 10, way_string[c->scache.ways], c->scache.linesz);
c->options |= MIPS_CPU_INCLUSIVE_CACHES;
}
void au1x00_fixup_config_od(void)
{
/*
* c0_config.od (bit 19) was write only (and read as 0)
* on the early revisions of Alchemy SOCs. It disables the bus
* transaction overlapping and needs to be set to fix various errata.
*/
switch (read_c0_prid()) {
case 0x00030100: /* Au1000 DA */
case 0x00030201: /* Au1000 HA */
case 0x00030202: /* Au1000 HB */
case 0x01030200: /* Au1500 AB */
/*
* Au1100 errata actually keeps silence about this bit, so we set it
* just in case for those revisions that require it to be set according
* to the (now gone) cpu table.
*/
case 0x02030200: /* Au1100 AB */
case 0x02030201: /* Au1100 BA */
case 0x02030202: /* Au1100 BC */
set_c0_config(1 << 19);
break;
}
}
/* CP0 hazard avoidance. */
#define NXP_BARRIER() \
__asm__ __volatile__( \
".set noreorder\n\t" \
"nop; nop; nop; nop; nop; nop;\n\t" \
".set reorder\n\t")
static void nxp_pr4450_fixup_config(void)
{
unsigned long config0;
config0 = read_c0_config();
/* clear all three cache coherency fields */
config0 &= ~(0x7 | (7 << 25) | (7 << 28));
config0 |= (((_page_cachable_default >> _CACHE_SHIFT) << 0) |
((_page_cachable_default >> _CACHE_SHIFT) << 25) |
((_page_cachable_default >> _CACHE_SHIFT) << 28));
write_c0_config(config0);
NXP_BARRIER();
}
static int cca = -1;
static int __init cca_setup(char *str)
{
get_option(&str, &cca);
return 0;
}
early_param("cca", cca_setup);
static void coherency_setup(void)
{
if (cca < 0 || cca > 7)
cca = read_c0_config() & CONF_CM_CMASK;
_page_cachable_default = cca << _CACHE_SHIFT;
pr_debug("Using cache attribute %d\n", cca);
change_c0_config(CONF_CM_CMASK, cca);
/*
* c0_status.cu=0 specifies that updates by the sc instruction use
* the coherency mode specified by the TLB; 1 means cachable
* coherent update on write will be used. Not all processors have
* this bit and; some wire it to zero, others like Toshiba had the
* silly idea of putting something else there ...
*/
switch (current_cpu_type()) {
case CPU_R4000PC:
case CPU_R4000SC:
case CPU_R4000MC:
case CPU_R4400PC:
case CPU_R4400SC:
case CPU_R4400MC:
clear_c0_config(CONF_CU);
break;
/*
* We need to catch the early Alchemy SOCs with
* the write-only co_config.od bit and set it back to one on:
* Au1000 rev DA, HA, HB; Au1100 AB, BA, BC, Au1500 AB
*/
case CPU_ALCHEMY:
au1x00_fixup_config_od();
break;
case PRID_IMP_PR4450:
nxp_pr4450_fixup_config();
break;
}
}
static void r4k_cache_error_setup(void)
{
extern char __weak except_vec2_generic;
extern char __weak except_vec2_sb1;
switch (current_cpu_type()) {
case CPU_SB1:
case CPU_SB1A:
set_uncached_handler(0x100, &except_vec2_sb1, 0x80);
break;
default:
set_uncached_handler(0x100, &except_vec2_generic, 0x80);
break;
}
}
void r4k_cache_init(void)
{
extern void build_clear_page(void);
extern void build_copy_page(void);
struct cpuinfo_mips *c = &current_cpu_data;
probe_pcache();
probe_vcache();
setup_scache();
r4k_blast_dcache_page_setup();
r4k_blast_dcache_page_indexed_setup();
r4k_blast_dcache_setup();
r4k_blast_icache_page_setup();
r4k_blast_icache_page_indexed_setup();
r4k_blast_icache_setup();
r4k_blast_scache_page_setup();
r4k_blast_scache_page_indexed_setup();
r4k_blast_scache_setup();
r4k_blast_scache_node_setup();
#ifdef CONFIG_EVA
r4k_blast_dcache_user_page_setup();
r4k_blast_icache_user_page_setup();
#endif
/*
* Some MIPS32 and MIPS64 processors have physically indexed caches.
* This code supports virtually indexed processors and will be
* unnecessarily inefficient on physically indexed processors.
*/
if (c->dcache.linesz && cpu_has_dc_aliases)
shm_align_mask = max_t( unsigned long,
c->dcache.sets * c->dcache.linesz - 1,
PAGE_SIZE - 1);
else
shm_align_mask = PAGE_SIZE-1;
__flush_cache_vmap = r4k__flush_cache_vmap;
__flush_cache_vunmap = r4k__flush_cache_vunmap;
flush_cache_all = cache_noop;
__flush_cache_all = r4k___flush_cache_all;
flush_cache_mm = r4k_flush_cache_mm;
flush_cache_page = r4k_flush_cache_page;
flush_cache_range = r4k_flush_cache_range;
__flush_kernel_vmap_range = r4k_flush_kernel_vmap_range;
flush_icache_all = r4k_flush_icache_all;
local_flush_data_cache_page = local_r4k_flush_data_cache_page;
flush_data_cache_page = r4k_flush_data_cache_page;
flush_icache_range = r4k_flush_icache_range;
local_flush_icache_range = local_r4k_flush_icache_range;
__flush_icache_user_range = r4k_flush_icache_user_range;
__local_flush_icache_user_range = local_r4k_flush_icache_user_range;
#ifdef CONFIG_DMA_NONCOHERENT
if (dma_default_coherent) {
_dma_cache_wback_inv = (void *)cache_noop;
_dma_cache_wback = (void *)cache_noop;
_dma_cache_inv = (void *)cache_noop;
} else {
_dma_cache_wback_inv = r4k_dma_cache_wback_inv;
_dma_cache_wback = r4k_dma_cache_wback_inv;
_dma_cache_inv = r4k_dma_cache_inv;
}
#endif /* CONFIG_DMA_NONCOHERENT */
build_clear_page();
build_copy_page();
/*
* We want to run CMP kernels on core with and without coherent
* caches. Therefore, do not use CONFIG_MIPS_CMP to decide whether
* or not to flush caches.
*/
local_r4k___flush_cache_all(NULL);
coherency_setup();
board_cache_error_setup = r4k_cache_error_setup;
/*
* Per-CPU overrides
*/
switch (current_cpu_type()) {
case CPU_BMIPS4350:
case CPU_BMIPS4380:
/* No IPI is needed because all CPUs share the same D$ */
flush_data_cache_page = r4k_blast_dcache_page;
break;
case CPU_BMIPS5000:
/* We lose our superpowers if L2 is disabled */
if (c->scache.flags & MIPS_CACHE_NOT_PRESENT)
break;
/* I$ fills from D$ just by emptying the write buffers */
flush_cache_page = (void *)b5k_instruction_hazard;
flush_cache_range = (void *)b5k_instruction_hazard;
local_flush_data_cache_page = (void *)b5k_instruction_hazard;
flush_data_cache_page = (void *)b5k_instruction_hazard;
flush_icache_range = (void *)b5k_instruction_hazard;
local_flush_icache_range = (void *)b5k_instruction_hazard;
/* Optimization: an L2 flush implicitly flushes the L1 */
current_cpu_data.options |= MIPS_CPU_INCLUSIVE_CACHES;
break;
case CPU_LOONGSON64:
/* Loongson-3 maintains cache coherency by hardware */
__flush_cache_all = cache_noop;
__flush_cache_vmap = cache_noop;
__flush_cache_vunmap = cache_noop;
__flush_kernel_vmap_range = (void *)cache_noop;
flush_cache_mm = (void *)cache_noop;
flush_cache_page = (void *)cache_noop;
flush_cache_range = (void *)cache_noop;
flush_icache_all = (void *)cache_noop;
flush_data_cache_page = (void *)cache_noop;
local_flush_data_cache_page = (void *)cache_noop;
break;
}
}
static int r4k_cache_pm_notifier(struct notifier_block *self, unsigned long cmd,
void *v)
{
switch (cmd) {
case CPU_PM_ENTER_FAILED:
case CPU_PM_EXIT:
coherency_setup();
break;
}
return NOTIFY_OK;
}
static struct notifier_block r4k_cache_pm_notifier_block = {
.notifier_call = r4k_cache_pm_notifier,
};
int __init r4k_cache_init_pm(void)
{
return cpu_pm_register_notifier(&r4k_cache_pm_notifier_block);
}
arch_initcall(r4k_cache_init_pm);