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Blackfin: decouple unrelated cache settings to get exact behavior

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The current cache options don't really represent the hardware features.
They end up setting different aspects of the hardware so that the end
result is to turn on/off the cache.  Unfortunately, when we hit cache
problems with the hardware, it's difficult to test different settings to
root cause the problem.  The current settings also don't cleanly allow for
different caching behaviors with different regions of memory.

So split the configure options such that they properly reflect the settings
that are applied to the hardware.

Signed-off-by: Jie Zhang <jie.zhang@analog.com>
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
This commit is contained in:
Jie Zhang 2009-06-16 09:48:33 +00:00 committed by Mike Frysinger
parent 7c039a90f0
commit 41ba653f24
11 changed files with 212 additions and 117 deletions
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125
arch/blackfin/Kconfig
View file

@ -907,76 +907,97 @@ endchoice
comment "Cache Support"
config BFIN_ICACHE
bool "Enable ICACHE"
default y
config BFIN_ICACHE_LOCK
bool "Enable Instruction Cache Locking"
depends on BFIN_ICACHE
default n
config BFIN_EXTMEM_ICACHEABLE
bool "Enable ICACHE for external memory"
depends on BFIN_ICACHE
default y
config BFIN_L2_ICACHEABLE
bool "Enable ICACHE for L2 SRAM"
depends on BFIN_ICACHE
depends on BF54x || BF561
default n
config BFIN_DCACHE
bool "Enable DCACHE"
default y
config BFIN_DCACHE_BANKA
bool "Enable only 16k BankA DCACHE - BankB is SRAM"
depends on BFIN_DCACHE && !BF531
default n
config BFIN_ICACHE_LOCK
bool "Enable Instruction Cache Locking"
choice
prompt "External memory cache policy"
config BFIN_EXTMEM_DCACHEABLE
bool "Enable DCACHE for external memory"
depends on BFIN_DCACHE
default BFIN_WB if !SMP
default BFIN_WT if SMP
config BFIN_WB
bool "Write back"
depends on !SMP
help
Write Back Policy:
Cached data will be written back to SDRAM only when needed.
This can give a nice increase in performance, but beware of
broken drivers that do not properly invalidate/flush their
cache.
Write Through Policy:
Cached data will always be written back to SDRAM when the
cache is updated. This is a completely safe setting, but
performance is worse than Write Back.
If you are unsure of the options and you want to be safe,
then go with Write Through.
config BFIN_WT
bool "Write through"
help
Write Back Policy:
Cached data will be written back to SDRAM only when needed.
This can give a nice increase in performance, but beware of
broken drivers that do not properly invalidate/flush their
cache.
Write Through Policy:
Cached data will always be written back to SDRAM when the
cache is updated. This is a completely safe setting, but
performance is worse than Write Back.
If you are unsure of the options and you want to be safe,
then go with Write Through.
endchoice
default y
choice
prompt "L2 SRAM cache policy"
depends on (BF54x || BF561)
default BFIN_L2_WT
config BFIN_L2_WB
prompt "External memory DCACHE policy"
depends on BFIN_EXTMEM_DCACHEABLE
default BFIN_EXTMEM_WRITEBACK if !SMP
default BFIN_EXTMEM_WRITETHROUGH if SMP
config BFIN_EXTMEM_WRITEBACK
bool "Write back"
depends on !SMP
help
Write Back Policy:
Cached data will be written back to SDRAM only when needed.
This can give a nice increase in performance, but beware of
broken drivers that do not properly invalidate/flush their
cache.
config BFIN_L2_WT
Write Through Policy:
Cached data will always be written back to SDRAM when the
cache is updated. This is a completely safe setting, but
performance is worse than Write Back.
If you are unsure of the options and you want to be safe,
then go with Write Through.
config BFIN_EXTMEM_WRITETHROUGH
bool "Write through"
depends on !SMP
help
Write Back Policy:
Cached data will be written back to SDRAM only when needed.
This can give a nice increase in performance, but beware of
broken drivers that do not properly invalidate/flush their
cache.
config BFIN_L2_NOT_CACHED
bool "Not cached"
Write Through Policy:
Cached data will always be written back to SDRAM when the
cache is updated. This is a completely safe setting, but
performance is worse than Write Back.
If you are unsure of the options and you want to be safe,
then go with Write Through.
endchoice
config BFIN_L2_DCACHEABLE
bool "Enable DCACHE for L2 SRAM"
depends on BFIN_DCACHE
depends on BF54x || BF561
default n
choice
prompt "L2 SRAM DCACHE policy"
depends on BFIN_L2_DCACHEABLE
default BFIN_L2_WRITEBACK
config BFIN_L2_WRITEBACK
bool "Write back"
depends on !SMP
config BFIN_L2_WRITETHROUGH
bool "Write through"
depends on !SMP
endchoice
comment "Memory Protection Unit"
config MPU
bool "Enable the memory protection unit (EXPERIMENTAL)"
default n

4
arch/blackfin/include/asm/cache.h
View file

@ -35,10 +35,10 @@
#if defined(CONFIG_SMP) && \
!defined(CONFIG_BFIN_CACHE_COHERENT)
# if defined(CONFIG_BFIN_ICACHE)
# if defined(CONFIG_BFIN_ICACHEABLE) || defined(CONFIG_BFIN_L2_ICACHEABLE)
# define __ARCH_SYNC_CORE_ICACHE
# endif
# if defined(CONFIG_BFIN_DCACHE)
# if defined(CONFIG_BFIN_DCACHEABLE) || defined(CONFIG_BFIN_L2_DCACHEABLE)
# define __ARCH_SYNC_CORE_DCACHE
# endif
#ifndef __ASSEMBLY__

10
arch/blackfin/include/asm/cacheflush.h
View file

@ -56,7 +56,7 @@ extern void blackfin_invalidate_entire_icache(void);
static inline void flush_icache_range(unsigned start, unsigned end)
{
#if defined(CONFIG_BFIN_WB)
#if defined(CONFIG_BFIN_EXTMEM_WRITEBACK) || defined(CONFIG_BFIN_L2_WRITEBACK)
blackfin_dcache_flush_range(start, end);
#endif
@ -87,9 +87,9 @@ do { memcpy(dst, src, len); \
#else
# define invalidate_dcache_range(start,end) do { } while (0)
#endif
#if defined(CONFIG_BFIN_DCACHE) && defined(CONFIG_BFIN_WB)
#if defined(CONFIG_BFIN_EXTMEM_WRITEBACK) || defined(CONFIG_BFIN_L2_WRITEBACK)
# define flush_dcache_range(start,end) blackfin_dcache_flush_range((start), (end))
# define flush_dcache_page(page) blackfin_dflush_page(page_address(page))
# define flush_dcache_page(page) blackfin_dflush_page(page_address(page))
#else
# define flush_dcache_range(start,end) do { } while (0)
# define flush_dcache_page(page) do { } while (0)
@ -100,7 +100,7 @@ extern unsigned long reserved_mem_icache_on;
static inline int bfin_addr_dcacheable(unsigned long addr)
{
#ifdef CONFIG_BFIN_DCACHE
#ifdef CONFIG_BFIN_EXTMEM_DCACHEABLE
if (addr < (_ramend - DMA_UNCACHED_REGION))
return 1;
#endif
@ -109,7 +109,7 @@ static inline int bfin_addr_dcacheable(unsigned long addr)
addr >= _ramend && addr < physical_mem_end)
return 1;
#ifndef CONFIG_BFIN_L2_NOT_CACHED
#ifdef CONFIG_BFIN_L2_DCACHEABLE
if (addr >= L2_START && addr < L2_START + L2_LENGTH)
return 1;
#endif

32
arch/blackfin/include/asm/cplb.h
View file

@ -37,8 +37,6 @@
#define L1_IMEMORY ( CPLB_USER_RD | CPLB_VALID | CPLB_LOCK)
#define SDRAM_INON_CHBL ( CPLB_USER_RD | CPLB_VALID)
/*Use the menuconfig cache policy here - CONFIG_BFIN_WT/CONFIG_BFIN_WB*/
#if ANOMALY_05000158
#define ANOMALY_05000158_WORKAROUND 0x200
#else
@ -47,10 +45,12 @@
#define CPLB_COMMON (CPLB_DIRTY | CPLB_SUPV_WR | CPLB_USER_WR | CPLB_USER_RD | CPLB_VALID | ANOMALY_05000158_WORKAROUND)
#ifdef CONFIG_BFIN_WB /*Write Back Policy */
#ifdef CONFIG_BFIN_EXTMEM_WRITEBACK
#define SDRAM_DGENERIC (CPLB_L1_CHBL | CPLB_COMMON)
#else /*Write Through */
#elif defined(CONFIG_BFIN_EXTMEM_WRITETHROUGH)
#define SDRAM_DGENERIC (CPLB_L1_CHBL | CPLB_WT | CPLB_L1_AOW | CPLB_COMMON)
#else
#define SDRAM_DGENERIC (CPLB_COMMON)
#endif
#define SDRAM_DNON_CHBL (CPLB_COMMON)
@ -61,21 +61,23 @@
#ifdef CONFIG_SMP
#define L2_ATTR (INITIAL_T | I_CPLB | D_CPLB)
#define L2_IMEMORY (CPLB_COMMON)
#define L2_DMEMORY (CPLB_LOCK | CPLB_COMMON)
#define L2_IMEMORY (CPLB_COMMON | PAGE_SIZE_1MB)
#define L2_DMEMORY (CPLB_LOCK | CPLB_COMMON | PAGE_SIZE_1MB)
#else
#define L2_ATTR (INITIAL_T | SWITCH_T | I_CPLB | D_CPLB)
#define L2_IMEMORY (SDRAM_IGENERIC)
# if defined(CONFIG_BFIN_L2_WB)
# define L2_DMEMORY (CPLB_L1_CHBL | CPLB_COMMON)
# elif defined(CONFIG_BFIN_L2_WT)
# define L2_DMEMORY (CPLB_L1_CHBL | CPLB_WT | CPLB_L1_AOW | CPLB_COMMON)
# elif defined(CONFIG_BFIN_L2_NOT_CACHED)
# define L2_DMEMORY (CPLB_COMMON)
# if defined(CONFIG_BFIN_L2_ICACHEABLE)
# define L2_IMEMORY (CPLB_L1_CHBL | CPLB_USER_RD | CPLB_VALID | PAGE_SIZE_1MB)
# else
# define L2_DMEMORY (0)
# define L2_IMEMORY ( CPLB_USER_RD | CPLB_VALID | PAGE_SIZE_1MB)
# endif
# if defined(CONFIG_BFIN_L2_WRITEBACK)
# define L2_DMEMORY (CPLB_L1_CHBL | CPLB_COMMON | PAGE_SIZE_1MB)
# elif defined(CONFIG_BFIN_L2_WRITETHROUGH)
# define L2_DMEMORY (CPLB_L1_CHBL | CPLB_WT | CPLB_L1_AOW | CPLB_COMMON | PAGE_SIZE_1MB)
# else
# define L2_DMEMORY (CPLB_COMMON | PAGE_SIZE_1MB)
# endif
#endif /* CONFIG_SMP */

10
arch/blackfin/kernel/cplb-mpu/cplbinit.c
View file

@ -46,13 +46,13 @@ void __init generate_cplb_tables_cpu(unsigned int cpu)
printk(KERN_INFO "MPU: setting up cplb tables with memory protection\n");
#ifdef CONFIG_BFIN_ICACHE
#ifdef CONFIG_BFIN_EXTMEM_ICACHEABLE
i_cache = CPLB_L1_CHBL | ANOMALY_05000158_WORKAROUND;
#endif
#ifdef CONFIG_BFIN_DCACHE
#ifdef CONFIG_BFIN_EXTMEM_DCACHEABLE
d_cache = CPLB_L1_CHBL;
#ifdef CONFIG_BFIN_WT
#ifdef CONFIG_BFIN_EXTMEM_WRITETROUGH
d_cache |= CPLB_L1_AOW | CPLB_WT;
#endif
#endif
@ -91,9 +91,9 @@ void __init generate_cplb_tables_cpu(unsigned int cpu)
/* Cover L2 memory */
#if L2_LENGTH > 0
dcplb_tbl[cpu][i_d].addr = L2_START;
dcplb_tbl[cpu][i_d++].data = L2_DMEMORY | PAGE_SIZE_1MB;
dcplb_tbl[cpu][i_d++].data = L2_DMEMORY;
icplb_tbl[cpu][i_i].addr = L2_START;
icplb_tbl[cpu][i_i++].data = L2_IMEMORY | PAGE_SIZE_1MB;
icplb_tbl[cpu][i_i++].data = L2_IMEMORY;
#endif
first_mask_dcplb = i_d;

36
arch/blackfin/kernel/cplb-mpu/cplbmgr.c
View file

@ -150,15 +150,19 @@ static noinline int dcplb_miss(unsigned int cpu)
nr_dcplb_miss[cpu]++;
d_data = CPLB_SUPV_WR | CPLB_VALID | CPLB_DIRTY | PAGE_SIZE_4KB;
#ifdef CONFIG_BFIN_DCACHE
#ifdef CONFIG_BFIN_EXTMEM_DCACHEABLE
if (bfin_addr_dcacheable(addr)) {
d_data |= CPLB_L1_CHBL | ANOMALY_05000158_WORKAROUND;
#ifdef CONFIG_BFIN_WT
# ifdef CONFIG_BFIN_EXTMEM_WRITETHROUGH
d_data |= CPLB_L1_AOW | CPLB_WT;
#endif
# endif
}
#endif
if (addr >= physical_mem_end) {
if (L2_LENGTH && addr >= L2_START && addr < L2_START + L2_LENGTH) {
addr = L2_START;
d_data = L2_DMEMORY;
} else if (addr >= physical_mem_end) {
if (addr >= ASYNC_BANK0_BASE && addr < ASYNC_BANK3_BASE + ASYNC_BANK3_SIZE
&& (status & FAULT_USERSUPV)) {
addr &= ~0x3fffff;
@ -235,7 +239,7 @@ static noinline int icplb_miss(unsigned int cpu)
i_data = CPLB_VALID | CPLB_PORTPRIO | PAGE_SIZE_4KB;
#ifdef CONFIG_BFIN_ICACHE
#ifdef CONFIG_BFIN_EXTMEM_ICACHEABLE
/*
* Normal RAM, and possibly the reserved memory area, are
* cacheable.
@ -245,7 +249,10 @@ static noinline int icplb_miss(unsigned int cpu)
i_data |= CPLB_L1_CHBL | ANOMALY_05000158_WORKAROUND;
#endif
if (addr >= physical_mem_end) {
if (L2_LENGTH && addr >= L2_START && addr < L2_START + L2_LENGTH) {
addr = L2_START;
i_data = L2_IMEMORY;
} else if (addr >= physical_mem_end) {
if (addr >= BOOT_ROM_START && addr < BOOT_ROM_START + BOOT_ROM_LENGTH
&& (status & FAULT_USERSUPV)) {
addr &= ~(1 * 1024 * 1024 - 1);
@ -365,13 +372,18 @@ void set_mask_dcplbs(unsigned long *masks, unsigned int cpu)
local_irq_save_hw(flags);
current_rwx_mask[cpu] = masks;
d_data = CPLB_SUPV_WR | CPLB_VALID | CPLB_DIRTY | PAGE_SIZE_4KB;
#ifdef CONFIG_BFIN_DCACHE
d_data |= CPLB_L1_CHBL;
#ifdef CONFIG_BFIN_WT
d_data |= CPLB_L1_AOW | CPLB_WT;
#endif
if (L2_LENGTH && addr >= L2_START && addr < L2_START + L2_LENGTH) {
addr = L2_START;
d_data = L2_DMEMORY;
} else {
d_data = CPLB_SUPV_WR | CPLB_VALID | CPLB_DIRTY | PAGE_SIZE_4KB;
#ifdef CONFIG_BFIN_EXTMEM_DCACHEABLE
d_data |= CPLB_L1_CHBL;
# ifdef CONFIG_BFIN_EXTMEM_WRITETHROUGH
d_data |= CPLB_L1_AOW | CPLB_WT;
# endif
#endif
}
disable_dcplb();
for (i = first_mask_dcplb; i < first_switched_dcplb; i++) {

100
arch/blackfin/kernel/setup.c
View file

@ -117,15 +117,49 @@ void __cpuinit bfin_setup_caches(unsigned int cpu)
*/
#ifdef CONFIG_BFIN_ICACHE
printk(KERN_INFO "Instruction Cache Enabled for CPU%u\n", cpu);
#endif
#ifdef CONFIG_BFIN_DCACHE
printk(KERN_INFO "Data Cache Enabled for CPU%u"
# if defined CONFIG_BFIN_WB
" (write-back)"
# elif defined CONFIG_BFIN_WT
" (write-through)"
printk(KERN_INFO " External memory:"
# ifdef CONFIG_BFIN_EXTMEM_ICACHEABLE
" cacheable"
# else
" uncacheable"
# endif
"\n", cpu);
" in instruction cache\n");
if (L2_LENGTH)
printk(KERN_INFO " L2 SRAM :"
# ifdef CONFIG_BFIN_L2_ICACHEABLE
" cacheable"
# else
" uncacheable"
# endif
" in instruction cache\n");
#else
printk(KERN_INFO "Instruction Cache Disabled for CPU%u\n", cpu);
#endif
#ifdef CONFIG_BFIN_DCACHE
printk(KERN_INFO "Data Cache Enabled for CPU%u\n", cpu);
printk(KERN_INFO " External memory:"
# if defined CONFIG_BFIN_EXTMEM_WRITEBACK
" cacheable (write-back)"
# elif defined CONFIG_BFIN_EXTMEM_WRITETHROUGH
" cacheable (write-through)"
# else
" uncacheable"
# endif
" in data cache\n");
if (L2_LENGTH)
printk(KERN_INFO " L2 SRAM :"
# if defined CONFIG_BFIN_L2_WRITEBACK
" cacheable (write-back)"
# elif defined CONFIG_BFIN_L2_WRITETHROUGH
" cacheable (write-through)"
# else
" uncacheable"
# endif
" in data cache\n");
#else
printk(KERN_INFO "Data Cache Disabled for CPU%u\n", cpu);
#endif
}
@ -516,7 +550,7 @@ static __init void memory_setup(void)
&& ((unsigned long *)mtd_phys)[1] == ROMSB_WORD1)
mtd_size =
PAGE_ALIGN(be32_to_cpu(((unsigned long *)mtd_phys)[2]));
# if (defined(CONFIG_BFIN_ICACHE) && ANOMALY_05000263)
# if (defined(CONFIG_BFIN_EXTMEM_ICACHEABLE) && ANOMALY_05000263)
/* Due to a Hardware Anomaly we need to limit the size of usable
* instruction memory to max 60MB, 56 if HUNT_FOR_ZERO is on
* 05000263 - Hardware loop corrupted when taking an ICPLB exception
@ -544,7 +578,7 @@ static __init void memory_setup(void)
dma_memcpy((void *)uclinux_ram_map.phys, _end, uclinux_ram_map.size);
#endif /* CONFIG_MTD_UCLINUX */
#if (defined(CONFIG_BFIN_ICACHE) && ANOMALY_05000263)
#if (defined(CONFIG_BFIN_EXTMEM_ICACHEABLE) && ANOMALY_05000263)
/* Due to a Hardware Anomaly we need to limit the size of usable
* instruction memory to max 60MB, 56 if HUNT_FOR_ZERO is on
* 05000263 - Hardware loop corrupted when taking an ICPLB exception
@ -1158,16 +1192,25 @@ static int show_cpuinfo(struct seq_file *m, void *v)
icache_size = 0;
seq_printf(m, "cache size\t: %d KB(L1 icache) "
"%d KB(L1 dcache%s) %d KB(L2 cache)\n",
icache_size, dcache_size,
#if defined CONFIG_BFIN_WB
"-wb"
#elif defined CONFIG_BFIN_WT
"-wt"
#endif
"", 0);
"%d KB(L1 dcache) %d KB(L2 cache)\n",
icache_size, dcache_size, 0);
seq_printf(m, "%s\n", cache);
seq_printf(m, "external memory\t: "
#if defined(CONFIG_BFIN_EXTMEM_ICACHEABLE)
"cacheable"
#else
"uncacheable"
#endif
" in instruction cache\n");
seq_printf(m, "external memory\t: "
#if defined(CONFIG_BFIN_EXTMEM_WRITEBACK)
"cacheable (write-back)"
#elif defined(CONFIG_BFIN_EXTMEM_WRITETHROUGH)
"cacheable (write-through)"
#else
"uncacheable"
#endif
" in data cache\n");
if (icache_size)
seq_printf(m, "icache setup\t: %d Sub-banks/%d Ways, %d Lines/Way\n",
@ -1240,8 +1283,25 @@ static int show_cpuinfo(struct seq_file *m, void *v)
if (cpu_num != num_possible_cpus() - 1)
return 0;
if (L2_LENGTH)
if (L2_LENGTH) {
seq_printf(m, "L2 SRAM\t\t: %dKB\n", L2_LENGTH/0x400);
seq_printf(m, "L2 SRAM\t\t: "
#if defined(CONFIG_BFIN_L2_ICACHEABLE)
"cacheable"
#else
"uncacheable"
#endif
" in instruction cache\n");
seq_printf(m, "L2 SRAM\t\t: "
#if defined(CONFIG_BFIN_L2_WRITEBACK)
"cacheable (write-back)"
#elif defined(CONFIG_BFIN_L2_WRITETHROUGH)
"cacheable (write-through)"
#else
"uncacheable"
#endif
" in data cache\n");
}
seq_printf(m, "board name\t: %s\n", bfin_board_name);
seq_printf(m, "board memory\t: %ld kB (0x%p -> 0x%p)\n",
physical_mem_end >> 10, (void *)0, (void *)physical_mem_end);

4
arch/blackfin/mach-common/arch_checks.c
View file

@ -74,7 +74,7 @@
/* if 220 exists, can not set External Memory WB and L2 not_cached, either External Memory not_cached and L2 WB */
#if ANOMALY_05000220 && \
((defined(CONFIG_BFIN_WB) && defined(CONFIG_BFIN_L2_NOT_CACHED)) || \
(!defined(CONFIG_BFIN_DCACHE) && defined(CONFIG_BFIN_L2_WB)))
((defined(CONFIG_BFIN_EXTMEM_WRITEBACK) && !defined(CONFIG_BFIN_L2_DCACHEABLE)) || \
(!defined(CONFIG_BFIN_EXTMEM_DCACHEABLE) && defined(CONFIG_BFIN_L2_WRITEBACK)))
# error You are exposing Anomaly 220 in this config, either config L2 as Write Through, or make External Memory WB.
#endif

2
arch/blackfin/mach-common/cpufreq.c
View file

@ -141,7 +141,7 @@ static int __init __bfin_cpu_init(struct cpufreq_policy *policy)
sclk = get_sclk() / 1000;
#if ANOMALY_05000273 || ANOMALY_05000274 || \
(!defined(CONFIG_BF54x) && defined(CONFIG_BFIN_DCACHE))
(!defined(CONFIG_BF54x) && defined(CONFIG_BFIN_EXTMEM_DCACHEABLE))
min_cclk = sclk * 2;
#else
min_cclk = sclk;

4
arch/blackfin/mach-common/pm.c
View file

@ -132,7 +132,7 @@ int bf53x_resume_l1_mem(unsigned char *memptr)
return 0;
}
#ifdef CONFIG_BFIN_WB
#if defined(CONFIG_BFIN_EXTMEM_WRITEBACK) || defined(CONFIG_BFIN_L2_WRITEBACK)
static void flushinv_all_dcache(void)
{
u32 way, bank, subbank, set;
@ -175,7 +175,7 @@ static inline void dcache_disable(void)
#ifdef CONFIG_BFIN_DCACHE
unsigned long ctrl;
#ifdef CONFIG_BFIN_WB
#if defined(CONFIG_BFIN_EXTMEM_WRITEBACK) || defined(CONFIG_BFIN_L2_WRITEBACK)
flushinv_all_dcache();
#endif
SSYNC();

2
arch/blackfin/mm/init.c
View file

@ -160,7 +160,7 @@ void __init mem_init(void)
/* do not count in kernel image between _rambase and _ramstart */
reservedpages -= (_ramstart - _rambase) >> PAGE_SHIFT;
#if (defined(CONFIG_BFIN_ICACHE) && ANOMALY_05000263)
#if (defined(CONFIG_BFIN_EXTMEM_ICACHEABLE) && ANOMALY_05000263)
reservedpages += (_ramend - memory_end - DMA_UNCACHED_REGION) >> PAGE_SHIFT;
#endif