diff options
Diffstat (limited to 'arch/sh')
| -rw-r--r-- | arch/sh/boot/compressed/misc.c | 2 | ||||
| -rw-r--r-- | arch/sh/include/asm/mmu.h | 12 | ||||
| -rw-r--r-- | arch/sh/include/asm/page.h | 11 | ||||
| -rw-r--r-- | arch/sh/include/asm/uncached.h | 18 | ||||
| -rw-r--r-- | arch/sh/kernel/head_32.S | 42 | ||||
| -rw-r--r-- | arch/sh/kernel/setup.c | 2 | ||||
| -rw-r--r-- | arch/sh/mm/Kconfig | 10 | ||||
| -rw-r--r-- | arch/sh/mm/init.c | 1 | ||||
| -rw-r--r-- | arch/sh/mm/pmb.c | 243 | ||||
| -rw-r--r-- | arch/sh/mm/uncached.c | 6 |
10 files changed, 276 insertions, 71 deletions
diff --git a/arch/sh/boot/compressed/misc.c b/arch/sh/boot/compressed/misc.c index 9ba07927d16a..27140a6b365d 100644 --- a/arch/sh/boot/compressed/misc.c +++ b/arch/sh/boot/compressed/misc.c @@ -117,7 +117,7 @@ void decompress_kernel(void) output_addr = (CONFIG_MEMORY_START + 0x2000); #else output_addr = __pa((unsigned long)&_text+PAGE_SIZE); -#if defined(CONFIG_29BIT) || defined(CONFIG_PMB_LEGACY) +#if defined(CONFIG_29BIT) output_addr |= P2SEG; #endif #endif diff --git a/arch/sh/include/asm/mmu.h b/arch/sh/include/asm/mmu.h index e42c4e2a41df..15a05b615ba7 100644 --- a/arch/sh/include/asm/mmu.h +++ b/arch/sh/include/asm/mmu.h @@ -58,7 +58,7 @@ typedef struct { long pmb_remap(unsigned long virt, unsigned long phys, unsigned long size, pgprot_t prot); void pmb_unmap(unsigned long addr); -int pmb_init(void); +void pmb_init(void); bool __in_29bit_mode(void); #else static inline long pmb_remap(unsigned long virt, unsigned long phys, @@ -67,14 +67,8 @@ static inline long pmb_remap(unsigned long virt, unsigned long phys, return -EINVAL; } -static inline void pmb_unmap(unsigned long addr) -{ -} - -static inline int pmb_init(void) -{ - return -ENODEV; -} +#define pmb_unmap(addr) do { } while (0) +#define pmb_init(addr) do { } while (0) #ifdef CONFIG_29BIT #define __in_29bit_mode() (1) diff --git a/arch/sh/include/asm/page.h b/arch/sh/include/asm/page.h index 8237d9f53e56..d71feb359304 100644 --- a/arch/sh/include/asm/page.h +++ b/arch/sh/include/asm/page.h @@ -45,21 +45,12 @@ #endif #ifndef __ASSEMBLY__ +#include <asm/uncached.h> extern unsigned long shm_align_mask; extern unsigned long max_low_pfn, min_low_pfn; extern unsigned long memory_start, memory_end; -#ifdef CONFIG_UNCACHED_MAPPING -extern unsigned long uncached_start, uncached_end; - -extern int virt_addr_uncached(unsigned long kaddr); -extern void uncached_init(void); -#else -#define virt_addr_uncached(kaddr) (0) -#define uncached_init() do { } while (0) -#endif - static inline unsigned long pages_do_alias(unsigned long addr1, unsigned long addr2) { diff --git a/arch/sh/include/asm/uncached.h b/arch/sh/include/asm/uncached.h new file mode 100644 index 000000000000..e3419f96626a --- /dev/null +++ b/arch/sh/include/asm/uncached.h @@ -0,0 +1,18 @@ +#ifndef __ASM_SH_UNCACHED_H +#define __ASM_SH_UNCACHED_H + +#include <linux/bug.h> + +#ifdef CONFIG_UNCACHED_MAPPING +extern unsigned long uncached_start, uncached_end; + +extern int virt_addr_uncached(unsigned long kaddr); +extern void uncached_init(void); +extern void uncached_resize(unsigned long size); +#else +#define virt_addr_uncached(kaddr) (0) +#define uncached_init() do { } while (0) +#define uncached_resize(size) BUG() +#endif + +#endif /* __ASM_SH_UNCACHED_H */ diff --git a/arch/sh/kernel/head_32.S b/arch/sh/kernel/head_32.S index 79ff39517f8e..fe0b743881b0 100644 --- a/arch/sh/kernel/head_32.S +++ b/arch/sh/kernel/head_32.S @@ -85,7 +85,7 @@ ENTRY(_stext) ldc r0, r7_bank ! ... and initial thread_info #endif -#if defined(CONFIG_PMB) && !defined(CONFIG_PMB_LEGACY) +#ifdef CONFIG_PMB /* * Reconfigure the initial PMB mappings setup by the hardware. * @@ -139,7 +139,6 @@ ENTRY(_stext) mov.l r0, @r1 mov.l .LMEMORY_SIZE, r5 - mov r5, r7 mov #PMB_E_SHIFT, r0 mov #0x1, r4 @@ -150,6 +149,40 @@ ENTRY(_stext) mov.l .LFIRST_ADDR_ENTRY, r2 mov.l .LPMB_ADDR, r3 + /* + * First we need to walk the PMB and figure out if there are any + * existing mappings that match the initial mappings VPN/PPN. + * If these have already been established by the bootloader, we + * don't bother setting up new entries here, and let the late PMB + * initialization take care of things instead. + * + * Note that we may need to coalesce and merge entries in order + * to reclaim more available PMB slots, which is much more than + * we want to do at this early stage. + */ + mov #0, r10 + mov #NR_PMB_ENTRIES, r9 + + mov r1, r7 /* temporary PMB_DATA iter */ + +.Lvalidate_existing_mappings: + + mov.l @r7, r8 + and r0, r8 + cmp/eq r0, r8 /* Check for valid __MEMORY_START mappings */ + bt .Lpmb_done + + add #1, r10 /* Increment the loop counter */ + cmp/eq r9, r10 + bf/s .Lvalidate_existing_mappings + add r4, r7 /* Increment to the next PMB_DATA entry */ + + /* + * If we've fallen through, continue with setting up the initial + * mappings. + */ + + mov r5, r7 /* cached_to_uncached */ mov #0, r10 #ifdef CONFIG_UNCACHED_MAPPING @@ -252,7 +285,8 @@ ENTRY(_stext) mov.l 6f, r0 icbi @r0 -#endif /* !CONFIG_PMB_LEGACY */ +.Lpmb_done: +#endif /* CONFIG_PMB */ #ifndef CONFIG_SH_NO_BSS_INIT /* @@ -304,7 +338,7 @@ ENTRY(stack_start) 6: .long sh_cpu_init 7: .long init_thread_union -#if defined(CONFIG_PMB) && !defined(CONFIG_PMB_LEGACY) +#ifdef CONFIG_PMB .LPMB_ADDR: .long PMB_ADDR .LPMB_DATA: .long PMB_DATA .LFIRST_ADDR_ENTRY: .long PAGE_OFFSET | PMB_V diff --git a/arch/sh/kernel/setup.c b/arch/sh/kernel/setup.c index e187750dd319..3459e70eed72 100644 --- a/arch/sh/kernel/setup.c +++ b/arch/sh/kernel/setup.c @@ -421,6 +421,8 @@ void __init setup_arch(char **cmdline_p) parse_early_param(); + uncached_init(); + plat_early_device_setup(); /* Let earlyprintk output early console messages */ diff --git a/arch/sh/mm/Kconfig b/arch/sh/mm/Kconfig index 65cb5b83e072..1445ca6257df 100644 --- a/arch/sh/mm/Kconfig +++ b/arch/sh/mm/Kconfig @@ -91,16 +91,6 @@ config PMB 32-bits through the SH-4A PMB. If this is not set, legacy 29-bit physical addressing will be used. -config PMB_LEGACY - bool "Support legacy boot mappings for PMB" - depends on PMB - select 32BIT - help - If this option is enabled, fixed PMB mappings are inherited - from the boot loader, and the kernel does not attempt dynamic - management. This is the closest to legacy 29-bit physical mode, - and allows systems to support up to 512MiB of system memory. - config X2TLB def_bool y depends on (CPU_SHX2 || CPU_SHX3) && MMU diff --git a/arch/sh/mm/init.c b/arch/sh/mm/init.c index 08e280d7cc7e..68028e8f26ce 100644 --- a/arch/sh/mm/init.c +++ b/arch/sh/mm/init.c @@ -245,7 +245,6 @@ void __init mem_init(void) memset(empty_zero_page, 0, PAGE_SIZE); __flush_wback_region(empty_zero_page, PAGE_SIZE); - uncached_init(); vsyscall_init(); codesize = (unsigned long) &_etext - (unsigned long) &_text; diff --git a/arch/sh/mm/pmb.c b/arch/sh/mm/pmb.c index b9d5476e1284..198bcff5e96f 100644 --- a/arch/sh/mm/pmb.c +++ b/arch/sh/mm/pmb.c @@ -52,7 +52,7 @@ struct pmb_entry { struct pmb_entry *link; }; -static void pmb_unmap_entry(struct pmb_entry *); +static void pmb_unmap_entry(struct pmb_entry *, int depth); static DEFINE_RWLOCK(pmb_rwlock); static struct pmb_entry pmb_entry_list[NR_PMB_ENTRIES]; @@ -115,13 +115,14 @@ static struct pmb_entry *pmb_alloc(unsigned long vpn, unsigned long ppn, pmbe = &pmb_entry_list[pos]; + memset(pmbe, 0, sizeof(struct pmb_entry)); + spin_lock_init(&pmbe->lock); pmbe->vpn = vpn; pmbe->ppn = ppn; pmbe->flags = flags; pmbe->entry = pos; - pmbe->size = 0; return pmbe; @@ -133,7 +134,9 @@ out: static void pmb_free(struct pmb_entry *pmbe) { __clear_bit(pmbe->entry, pmb_map); - pmbe->entry = PMB_NO_ENTRY; + + pmbe->entry = PMB_NO_ENTRY; + pmbe->link = NULL; } /* @@ -161,9 +164,6 @@ static __always_inline unsigned long pmb_cache_flags(void) */ static void __set_pmb_entry(struct pmb_entry *pmbe) { - pmbe->flags &= ~PMB_CACHE_MASK; - pmbe->flags |= pmb_cache_flags(); - writel_uncached(pmbe->vpn | PMB_V, mk_pmb_addr(pmbe->entry)); writel_uncached(pmbe->ppn | pmbe->flags | PMB_V, mk_pmb_data(pmbe->entry)); @@ -280,7 +280,7 @@ again: return wanted - size; out: - pmb_unmap_entry(pmbp); + pmb_unmap_entry(pmbp, NR_PMB_ENTRIES); return err; } @@ -302,18 +302,40 @@ void pmb_unmap(unsigned long addr) read_unlock(&pmb_rwlock); - pmb_unmap_entry(pmbe); + pmb_unmap_entry(pmbe, NR_PMB_ENTRIES); } -static void pmb_unmap_entry(struct pmb_entry *pmbe) +static bool pmb_can_merge(struct pmb_entry *a, struct pmb_entry *b) { - unsigned long flags; + return (b->vpn == (a->vpn + a->size)) && + (b->ppn == (a->ppn + a->size)) && + (b->flags == a->flags); +} - if (unlikely(!pmbe)) - return; +static bool pmb_size_valid(unsigned long size) +{ + int i; - write_lock_irqsave(&pmb_rwlock, flags); + for (i = 0; i < ARRAY_SIZE(pmb_sizes); i++) + if (pmb_sizes[i].size == size) + return true; + + return false; +} + +static int pmb_size_to_flags(unsigned long size) +{ + int i; + + for (i = 0; i < ARRAY_SIZE(pmb_sizes); i++) + if (pmb_sizes[i].size == size) + return pmb_sizes[i].flag; + return 0; +} + +static void __pmb_unmap_entry(struct pmb_entry *pmbe, int depth) +{ do { struct pmb_entry *pmblink = pmbe; @@ -332,8 +354,18 @@ static void pmb_unmap_entry(struct pmb_entry *pmbe) pmbe = pmblink->link; pmb_free(pmblink); - } while (pmbe); + } while (pmbe && --depth); +} + +static void pmb_unmap_entry(struct pmb_entry *pmbe, int depth) +{ + unsigned long flags; + if (unlikely(!pmbe)) + return; + + write_lock_irqsave(&pmb_rwlock, flags); + __pmb_unmap_entry(pmbe, depth); write_unlock_irqrestore(&pmb_rwlock, flags); } @@ -342,14 +374,40 @@ static __always_inline unsigned int pmb_ppn_in_range(unsigned long ppn) return ppn >= __pa(memory_start) && ppn < __pa(memory_end); } -static int pmb_synchronize_mappings(void) +static void __init pmb_notify(void) { - unsigned int applied = 0; - struct pmb_entry *pmbp = NULL; - int i, j; + int i; pr_info("PMB: boot mappings:\n"); + read_lock(&pmb_rwlock); + + for (i = 0; i < ARRAY_SIZE(pmb_entry_list); i++) { + struct pmb_entry *pmbe; + + if (!test_bit(i, pmb_map)) + continue; + + pmbe = &pmb_entry_list[i]; + + pr_info(" 0x%08lx -> 0x%08lx [ %4ldMB %2scached ]\n", + pmbe->vpn >> PAGE_SHIFT, pmbe->ppn >> PAGE_SHIFT, + pmbe->size >> 20, (pmbe->flags & PMB_C) ? "" : "un"); + } + + read_unlock(&pmb_rwlock); +} + +/* + * Sync our software copy of the PMB mappings with those in hardware. The + * mappings in the hardware PMB were either set up by the bootloader or + * very early on by the kernel. + */ +static void __init pmb_synchronize(void) +{ + struct pmb_entry *pmbp = NULL; + int i, j; + /* * Run through the initial boot mappings, log the established * ones, and blow away anything that falls outside of the valid @@ -432,10 +490,10 @@ static int pmb_synchronize_mappings(void) /* * Compare the previous entry against the current one to * see if the entries span a contiguous mapping. If so, - * setup the entry links accordingly. + * setup the entry links accordingly. Compound mappings + * are later coalesced. */ - if ((pmbe->vpn == (pmbp->vpn + pmbp->size)) && - (pmbe->ppn == (pmbp->ppn + pmbp->size))) + if (pmb_can_merge(pmbp, pmbe)) pmbp->link = pmbe; spin_unlock(&pmbp->lock); @@ -444,37 +502,150 @@ static int pmb_synchronize_mappings(void) pmbp = pmbe; spin_unlock_irqrestore(&pmbe->lock, irqflags); + } +} - pr_info("\t0x%08lx -> 0x%08lx [ %ldMB %scached ]\n", - vpn >> PAGE_SHIFT, ppn >> PAGE_SHIFT, pmbe->size >> 20, - (data_val & PMB_C) ? "" : "un"); +static void __init pmb_merge(struct pmb_entry *head) +{ + unsigned long span, newsize; + struct pmb_entry *tail; + int i = 1, depth = 0; + + span = newsize = head->size; - applied++; + tail = head->link; + while (tail) { + span += tail->size; + + if (pmb_size_valid(span)) { + newsize = span; + depth = i; + } + + /* This is the end of the line.. */ + if (!tail->link) + break; + + tail = tail->link; + i++; } - return (applied == 0); + /* + * The merged page size must be valid. + */ + if (!pmb_size_valid(newsize)) + return; + + head->flags &= ~PMB_SZ_MASK; + head->flags |= pmb_size_to_flags(newsize); + + head->size = newsize; + + __pmb_unmap_entry(head->link, depth); + __set_pmb_entry(head); } -int pmb_init(void) +static void __init pmb_coalesce(void) { - int ret; + unsigned long flags; + int i; + + write_lock_irqsave(&pmb_rwlock, flags); + + for (i = 0; i < ARRAY_SIZE(pmb_entry_list); i++) { + struct pmb_entry *pmbe; + + if (!test_bit(i, pmb_map)) + continue; + + pmbe = &pmb_entry_list[i]; + + /* + * We're only interested in compound mappings + */ + if (!pmbe->link) + continue; + + /* + * Nothing to do if it already uses the largest possible + * page size. + */ + if (pmbe->size == SZ_512M) + continue; + + pmb_merge(pmbe); + } + + write_unlock_irqrestore(&pmb_rwlock, flags); +} + +#ifdef CONFIG_UNCACHED_MAPPING +static void __init pmb_resize(void) +{ + int i; /* - * Sync our software copy of the PMB mappings with those in - * hardware. The mappings in the hardware PMB were either set up - * by the bootloader or very early on by the kernel. + * If the uncached mapping was constructed by the kernel, it will + * already be a reasonable size. */ - ret = pmb_synchronize_mappings(); - if (unlikely(ret == 0)) - return 0; + if (uncached_size == SZ_16M) + return; + + read_lock(&pmb_rwlock); + + for (i = 0; i < ARRAY_SIZE(pmb_entry_list); i++) { + struct pmb_entry *pmbe; + unsigned long flags; + + if (!test_bit(i, pmb_map)) + continue; + + pmbe = &pmb_entry_list[i]; + + if (pmbe->vpn != uncached_start) + continue; + + /* + * Found it, now resize it. + */ + spin_lock_irqsave(&pmbe->lock, flags); + + pmbe->size = SZ_16M; + pmbe->flags &= ~PMB_SZ_MASK; + pmbe->flags |= pmb_size_to_flags(pmbe->size); + + uncached_resize(pmbe->size); + + __set_pmb_entry(pmbe); + + spin_unlock_irqrestore(&pmbe->lock, flags); + } + + read_lock(&pmb_rwlock); +} +#endif + +void __init pmb_init(void) +{ + /* Synchronize software state */ + pmb_synchronize(); + + /* Attempt to combine compound mappings */ + pmb_coalesce(); + +#ifdef CONFIG_UNCACHED_MAPPING + /* Resize initial mappings, if necessary */ + pmb_resize(); +#endif + + /* Log them */ + pmb_notify(); writel_uncached(0, PMB_IRMCR); /* Flush out the TLB */ __raw_writel(__raw_readl(MMUCR) | MMUCR_TI, MMUCR); ctrl_barrier(); - - return 0; } bool __in_29bit_mode(void) diff --git a/arch/sh/mm/uncached.c b/arch/sh/mm/uncached.c index 807906981d9d..cf20a5c5136a 100644 --- a/arch/sh/mm/uncached.c +++ b/arch/sh/mm/uncached.c @@ -26,3 +26,9 @@ void __init uncached_init(void) uncached_start = memory_end; uncached_end = uncached_start + uncached_size; } + +void __init uncached_resize(unsigned long size) +{ + uncached_size = size; + uncached_end = uncached_start + uncached_size; +} |