/* * 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) 1999-2006 Helge Deller <deller@gmx.de> (07-13-1999) * Copyright (C) 1999 SuSE GmbH Nuernberg * Copyright (C) 2000 Philipp Rumpf (prumpf@tux.org) * * Cache and TLB management * */ #include <linux/init.h>#include <linux/kernel.h>#include <linux/mm.h>#include <linux/module.h>#include <linux/seq_file.h>#include <linux/pagemap.h>#include <linux/sched.h>#include <linux/sched/mm.h>#include <linux/syscalls.h>#include <asm/pdc.h>#include <asm/cache.h>#include <asm/cacheflush.h>#include <asm/tlbflush.h>#include <asm/page.h>#include <asm/processor.h>#include <asm/sections.h>#include <asm/shmparam.h>#include <asm/mmu_context.h>#include <asm/cachectl.h> int split_tlb __ro_after_init;int dcache_stride __ro_after_init;int icache_stride __ro_after_init;EXPORT_SYMBOL(dcache_stride); void flush_dcache_page_asm(unsigned long phys_addr, unsigned long vaddr);EXPORT_SYMBOL(flush_dcache_page_asm);void purge_dcache_page_asm(unsigned long phys_addr, unsigned long vaddr);void flush_icache_page_asm(unsigned long phys_addr, unsigned long vaddr); /* Internal implementation in arch/parisc/kernel/pacache.S */void flush_data_cache_local(void *); /* flushes local data-cache only */void flush_instruction_cache_local(void); /* flushes local code-cache only */ /* On some machines (i.e., ones with the Merced bus), there can be * only a single PxTLB broadcast at a time; this must be guaranteed * by software. We need a spinlock around all TLB flushes to ensure * this. */DEFINE_SPINLOCK(pa_tlb_flush_lock); #if defined(CONFIG_64BIT) && defined(CONFIG_SMP)int pa_serialize_tlb_flushes __ro_after_init;#endif struct pdc_cache_info cache_info __ro_after_init;#ifndef CONFIG_PA20struct pdc_btlb_info btlb_info __ro_after_init;#endif DEFINE_STATIC_KEY_TRUE(parisc_has_cache);DEFINE_STATIC_KEY_TRUE(parisc_has_dcache);DEFINE_STATIC_KEY_TRUE(parisc_has_icache); static void cache_flush_local_cpu(void *dummy){ if (static_branch_likely(&parisc_has_icache)) flush_instruction_cache_local(); if (static_branch_likely(&parisc_has_dcache)) flush_data_cache_local(NULL);} void flush_cache_all_local(void){ cache_flush_local_cpu(NULL);} void flush_cache_all(void){ if (static_branch_likely(&parisc_has_cache)) on_each_cpu(cache_flush_local_cpu, NULL, 1);} static inline void flush_data_cache(void){ if (static_branch_likely(&parisc_has_dcache)) on_each_cpu(flush_data_cache_local, NULL, 1);} /* Kernel virtual address of pfn. */#define pfn_va(pfn) __va(PFN_PHYS(pfn)) void __update_cache(pte_t pte){ unsigned long pfn = pte_pfn(pte); struct folio *folio; unsigned int nr; /* We don't have pte special. As a result, we can be called with an invalid pfn and we don't need to flush the kernel dcache page. This occurs with FireGL card in C8000. */ if (!pfn_valid(pfn)) return; folio = page_folio(pfn_to_page(pfn)); pfn = folio_pfn(folio); nr = folio_nr_pages(folio); if (folio_flush_mapping(folio) && test_bit(PG_dcache_dirty, &folio->flags)) { while (nr--) flush_kernel_dcache_page_addr(pfn_va(pfn + nr)); clear_bit(PG_dcache_dirty, &folio->flags); } else if (parisc_requires_coherency()) while (nr--) flush_kernel_dcache_page_addr(pfn_va(pfn + nr));} voidshow_cache_info(struct seq_file *m){ char buf[32]; seq_printf(m, "I-cache\t\t: %ld KB\n", cache_info.ic_size/1024 ); if (cache_info.dc_loop != 1) snprintf(buf, 32, "%lu-way associative", cache_info.dc_loop); seq_printf(m, "D-cache\t\t: %ld KB (%s%s, %s, alias=%d)\n", cache_info.dc_size/1024, (cache_info.dc_conf.cc_wt ? "WT":"WB"), (cache_info.dc_conf.cc_sh ? ", shared I/D":""), ((cache_info.dc_loop == 1) ? "direct mapped" : buf), cache_info.dc_conf.cc_alias ); seq_printf(m, "ITLB entries\t: %ld\n" "DTLB entries\t: %ld%s\n", cache_info.it_size, cache_info.dt_size, cache_info.dt_conf.tc_sh ? " - shared with ITLB":"" ); #ifndef CONFIG_PA20 /* BTLB - Block TLB */ if (btlb_info.max_size==0) { seq_printf(m, "BTLB\t\t: not supported\n" ); } else { seq_printf(m, "BTLB fixed\t: max. %d pages, pagesize=%d (%dMB)\n" "BTLB fix-entr.\t: %d instruction, %d data (%d combined)\n" "BTLB var-entr.\t: %d instruction, %d data (%d combined)\n", btlb_info.max_size, (int)4096, btlb_info.max_size>>8, btlb_info.fixed_range_info.num_i, btlb_info.fixed_range_info.num_d, btlb_info.fixed_range_info.num_comb, btlb_info.variable_range_info.num_i, btlb_info.variable_range_info.num_d, btlb_info.variable_range_info.num_comb ); }#endif} void __init parisc_cache_init(void){ if (pdc_cache_info(&cache_info) < 0) panic("parisc_cache_init: pdc_cache_info failed"); #if 0 printk("ic_size %lx dc_size %lx it_size %lx\n", cache_info.ic_size, cache_info.dc_size, cache_info.it_size); printk("DC base 0x%lx stride 0x%lx count 0x%lx loop 0x%lx\n", cache_info.dc_base, cache_info.dc_stride, cache_info.dc_count, cache_info.dc_loop); printk("dc_conf = 0x%lx alias %d blk %d line %d shift %d\n", *(unsigned long *) (&cache_info.dc_conf), cache_info.dc_conf.cc_alias, cache_info.dc_conf.cc_block, cache_info.dc_conf.cc_line, cache_info.dc_conf.cc_shift); printk(" wt %d sh %d cst %d hv %d\n", cache_info.dc_conf.cc_wt, cache_info.dc_conf.cc_sh, cache_info.dc_conf.cc_cst, cache_info.dc_conf.cc_hv); printk("IC base 0x%lx stride 0x%lx count 0x%lx loop 0x%lx\n", cache_info.ic_base, cache_info.ic_stride, cache_info.ic_count, cache_info.ic_loop); printk("IT base 0x%lx stride 0x%lx count 0x%lx loop 0x%lx off_base 0x%lx off_stride 0x%lx off_count 0x%lx\n", cache_info.it_sp_base, cache_info.it_sp_stride, cache_info.it_sp_count, cache_info.it_loop, cache_info.it_off_base, cache_info.it_off_stride, cache_info.it_off_count); printk("DT base 0x%lx stride 0x%lx count 0x%lx loop 0x%lx off_base 0x%lx off_stride 0x%lx off_count 0x%lx\n", cache_info.dt_sp_base, cache_info.dt_sp_stride, cache_info.dt_sp_count, cache_info.dt_loop, cache_info.dt_off_base, cache_info.dt_off_stride, cache_info.dt_off_count); printk("ic_conf = 0x%lx alias %d blk %d line %d shift %d\n", *(unsigned long *) (&cache_info.ic_conf), cache_info.ic_conf.cc_alias, cache_info.ic_conf.cc_block, cache_info.ic_conf.cc_line, cache_info.ic_conf.cc_shift); printk(" wt %d sh %d cst %d hv %d\n", cache_info.ic_conf.cc_wt, cache_info.ic_conf.cc_sh, cache_info.ic_conf.cc_cst, cache_info.ic_conf.cc_hv); printk("D-TLB conf: sh %d page %d cst %d aid %d sr %d\n", cache_info.dt_conf.tc_sh, cache_info.dt_conf.tc_page, cache_info.dt_conf.tc_cst, cache_info.dt_conf.tc_aid, cache_info.dt_conf.tc_sr); printk("I-TLB conf: sh %d page %d cst %d aid %d sr %d\n", cache_info.it_conf.tc_sh, cache_info.it_conf.tc_page, cache_info.it_conf.tc_cst, cache_info.it_conf.tc_aid, cache_info.it_conf.tc_sr);#endif split_tlb = 0; if (cache_info.dt_conf.tc_sh == 0 || cache_info.dt_conf.tc_sh == 2) { if (cache_info.dt_conf.tc_sh == 2) printk(KERN_WARNING "Unexpected TLB configuration. " "Will flush I/D separately (could be optimized).\n"); split_tlb = 1; } /* "New and Improved" version from Jim Hull * (1 << (cc_block-1)) * (cc_line << (4 + cnf.cc_shift)) * The following CAFL_STRIDE is an optimized version, see * http://lists.parisc-linux.org/pipermail/parisc-linux/2004-June/023625.html * http://lists.parisc-linux.org/pipermail/parisc-linux/2004-June/023671.html */#define CAFL_STRIDE(cnf) (cnf.cc_line << (3 + cnf.cc_block + cnf.cc_shift)) dcache_stride = CAFL_STRIDE(cache_info.dc_conf); icache_stride = CAFL_STRIDE(cache_info.ic_conf);#undef CAFL_STRIDE if ((boot_cpu_data.pdc.capabilities & PDC_MODEL_NVA_MASK) == PDC_MODEL_NVA_UNSUPPORTED) { printk(KERN_WARNING "parisc_cache_init: Only equivalent aliasing supported!\n");#if 0 panic("SMP kernel required to avoid non-equivalent aliasing");#endif }} void disable_sr_hashing(void){ int srhash_type, retval; unsigned long space_bits; switch (boot_cpu_data.cpu_type) { case pcx: /* We shouldn't get this far. setup.c should prevent it. */ BUG(); return; case pcxs: case pcxt: case pcxt_: srhash_type = SRHASH_PCXST; break; case pcxl: srhash_type = SRHASH_PCXL; break; case pcxl2: /* pcxl2 doesn't support space register hashing */ return; default: /* Currently all PA2.0 machines use the same ins. sequence */ srhash_type = SRHASH_PA20; break; } disable_sr_hashing_asm(srhash_type); retval = pdc_spaceid_bits(&space_bits); /* If this procedure isn't implemented, don't panic. */ if (retval < 0 && retval != PDC_BAD_OPTION) panic("pdc_spaceid_bits call failed.\n"); if (space_bits != 0) panic("SpaceID hashing is still on!\n");} static inline void__flush_cache_page(struct vm_area_struct *vma, unsigned long vmaddr, unsigned long physaddr){ if (!static_branch_likely(&parisc_has_cache)) return; preempt_disable(); flush_dcache_page_asm(physaddr, vmaddr); if (vma->vm_flags & VM_EXEC) flush_icache_page_asm(physaddr, vmaddr); preempt_enable();} static void flush_user_cache_page(struct vm_area_struct *vma, unsigned long vmaddr){ unsigned long flags, space, pgd, prot;#ifdef CONFIG_TLB_PTLOCK unsigned long pgd_lock;#endif vmaddr &= PAGE_MASK; preempt_disable(); /* Set context for flush */ local_irq_save(flags); prot = mfctl(8); space = mfsp(SR_USER); pgd = mfctl(25);#ifdef CONFIG_TLB_PTLOCK pgd_lock = mfctl(28);#endif switch_mm_irqs_off(NULL, vma->vm_mm, NULL); local_irq_restore(flags); flush_user_dcache_range_asm(vmaddr, vmaddr + PAGE_SIZE); if (vma->vm_flags & VM_EXEC) flush_user_icache_range_asm(vmaddr, vmaddr + PAGE_SIZE); flush_tlb_page(vma, vmaddr); /* Restore previous context */ local_irq_save(flags);#ifdef CONFIG_TLB_PTLOCK mtctl(pgd_lock, 28);#endif mtctl(pgd, 25); mtsp(space, SR_USER); mtctl(prot, 8); local_irq_restore(flags); preempt_enable();} void flush_icache_pages(struct vm_area_struct *vma, struct page *page, unsigned int nr){ void *kaddr = page_address(page); for (;;) { flush_kernel_dcache_page_addr(kaddr); flush_kernel_icache_page(kaddr); if (--nr == 0) break; kaddr += PAGE_SIZE; }} static inline pte_t *get_ptep(struct mm_struct *mm, unsigned long addr){ pte_t *ptep = NULL; pgd_t *pgd = mm->pgd; p4d_t *p4d; pud_t *pud; pmd_t *pmd; if (!pgd_none(*pgd)) { p4d = p4d_offset(pgd, addr); if (!p4d_none(*p4d)) { pud = pud_offset(p4d, addr); if (!pud_none(*pud)) { pmd = pmd_offset(pud, addr); if (!pmd_none(*pmd)) ptep = pte_offset_map(pmd, addr); } } } return ptep;} static inline bool pte_needs_flush(pte_t pte){ return (pte_val(pte) & (_PAGE_PRESENT | _PAGE_ACCESSED | _PAGE_NO_CACHE)) == (_PAGE_PRESENT | _PAGE_ACCESSED);} void flush_dcache_folio(struct folio *folio){ struct address_space *mapping = folio_flush_mapping(folio); struct vm_area_struct *vma; unsigned long addr, old_addr = 0; void *kaddr; unsigned long count = 0; unsigned long i, nr, flags; pgoff_t pgoff; if (mapping && !mapping_mapped(mapping)) { set_bit(PG_dcache_dirty, &folio->flags); return; } nr = folio_nr_pages(folio); kaddr = folio_address(folio); for (i = 0; i < nr; i++) flush_kernel_dcache_page_addr(kaddr + i * PAGE_SIZE); if (!mapping) return; pgoff = folio->index; /* * We have carefully arranged in arch_get_unmapped_area() that * *any* mappings of a file are always congruently mapped (whether * declared as MAP_PRIVATE or MAP_SHARED), so we only need * to flush one address here for them all to become coherent * on machines that support equivalent aliasing */ flush_dcache_mmap_lock_irqsave(mapping, flags); vma_interval_tree_foreach(vma, &mapping->i_mmap, pgoff, pgoff + nr - 1) { unsigned long offset = pgoff - vma->vm_pgoff; unsigned long pfn = folio_pfn(folio); addr = vma->vm_start; nr = folio_nr_pages(folio); if (offset > -nr) { pfn -= offset; nr += offset; } else { addr += offset * PAGE_SIZE; } if (addr + nr * PAGE_SIZE > vma->vm_end) nr = (vma->vm_end - addr) / PAGE_SIZE; if (parisc_requires_coherency()) { for (i = 0; i < nr; i++) { pte_t *ptep = get_ptep(vma->vm_mm, addr + i * PAGE_SIZE); if (!ptep) continue; if (pte_needs_flush(*ptep)) flush_user_cache_page(vma, addr + i * PAGE_SIZE); /* Optimise accesses to the same table? */ pte_unmap(ptep); } } else { /* * The TLB is the engine of coherence on parisc: * The CPU is entitled to speculate any page * with a TLB mapping, so here we kill the * mapping then flush the page along a special * flush only alias mapping. This guarantees that * the page is no-longer in the cache for any * process and nor may it be speculatively read * in (until the user or kernel specifically * accesses it, of course) */ for (i = 0; i < nr; i++) flush_tlb_page(vma, addr + i * PAGE_SIZE); if (old_addr == 0 || (old_addr & (SHM_COLOUR - 1)) != (addr & (SHM_COLOUR - 1))) { for (i = 0; i < nr; i++) __flush_cache_page(vma, addr + i * PAGE_SIZE, (pfn + i) * PAGE_SIZE); /* * Software is allowed to have any number * of private mappings to a page. */ if (!(vma->vm_flags & VM_SHARED)) continue; if (old_addr) pr_err("INEQUIVALENT ALIASES 0x%lx and 0x%lx in file %pD\n", old_addr, addr, vma->vm_file); if (nr == folio_nr_pages(folio)) old_addr = addr; }Lines 1–500 of 874. Load more
/* * 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) 1999-2006 Helge Deller <deller@gmx.de> (07-13-1999) * Copyright (C) 1999 SuSE GmbH Nuernberg * Copyright (C) 2000 Philipp Rumpf (prumpf@tux.org) * * Cache and TLB management * */ #include <linux/init.h> #include <linux/kernel.h> #include <linux/mm.h> #include <linux/module.h> #include <linux/seq_file.h> #include <linux/pagemap.h> #include <linux/sched.h> #include <linux/sched/mm.h> #include <linux/syscalls.h> #include <asm/pdc.h> #include <asm/cache.h> #include <asm/cacheflush.h> #include <asm/tlbflush.h> #include <asm/page.h> #include <asm/processor.h> #include <asm/sections.h> #include <asm/shmparam.h> #include <asm/mmu_context.h> #include <asm/cachectl.h> int split_tlb __ro_after_init; int dcache_stride __ro_after_init; int icache_stride __ro_after_init; EXPORT_SYMBOL(dcache_stride); void flush_dcache_page_asm(unsigned long phys_addr, unsigned long vaddr); EXPORT_SYMBOL(flush_dcache_page_asm); void purge_dcache_page_asm(unsigned long phys_addr, unsigned long vaddr); void flush_icache_page_asm(unsigned long phys_addr, unsigned long vaddr); /* Internal implementation in arch/parisc/kernel/pacache.S */ void flush_data_cache_local(void *); /* flushes local data-cache only */ void flush_instruction_cache_local(void); /* flushes local code-cache only */ /* On some machines (i.e., ones with the Merced bus), there can be * only a single PxTLB broadcast at a time; this must be guaranteed * by software. We need a spinlock around all TLB flushes to ensure * this. */ DEFINE_SPINLOCK(pa_tlb_flush_lock); #if defined(CONFIG_64BIT) && defined(CONFIG_SMP) int pa_serialize_tlb_flushes __ro_after_init; #endif struct pdc_cache_info cache_info __ro_after_init; #ifndef CONFIG_PA20 struct pdc_btlb_info btlb_info __ro_after_init; #endif DEFINE_STATIC_KEY_TRUE(parisc_has_cache); DEFINE_STATIC_KEY_TRUE(parisc_has_dcache); DEFINE_STATIC_KEY_TRUE(parisc_has_icache); static void cache_flush_local_cpu(void *dummy) { if (static_branch_likely(&parisc_has_icache)) flush_instruction_cache_local(); if (static_branch_likely(&parisc_has_dcache)) flush_data_cache_local(NULL); } void flush_cache_all_local(void) { cache_flush_local_cpu(NULL); } void flush_cache_all(void) { if (static_branch_likely(&parisc_has_cache)) on_each_cpu(cache_flush_local_cpu, NULL, 1); } static inline void flush_data_cache(void) { if (static_branch_likely(&parisc_has_dcache)) on_each_cpu(flush_data_cache_local, NULL, 1); } /* Kernel virtual address of pfn. */ #define pfn_va(pfn) __va(PFN_PHYS(pfn)) void __update_cache(pte_t pte) { unsigned long pfn = pte_pfn(pte); struct folio *folio; unsigned int nr; /* We don't have pte special. As a result, we can be called with an invalid pfn and we don't need to flush the kernel dcache page. This occurs with FireGL card in C8000. */ if (!pfn_valid(pfn)) return; folio = page_folio(pfn_to_page(pfn)); pfn = folio_pfn(folio); nr = folio_nr_pages(folio); if (folio_flush_mapping(folio) && test_bit(PG_dcache_dirty, &folio->flags)) { while (nr--) flush_kernel_dcache_page_addr(pfn_va(pfn + nr)); clear_bit(PG_dcache_dirty, &folio->flags); } else if (parisc_requires_coherency()) while (nr--) flush_kernel_dcache_page_addr(pfn_va(pfn + nr)); } void show_cache_info(struct seq_file *m) { char buf[32]; seq_printf(m, "I-cache\t\t: %ld KB\n", cache_info.ic_size/1024 ); if (cache_info.dc_loop != 1) snprintf(buf, 32, "%lu-way associative", cache_info.dc_loop); seq_printf(m, "D-cache\t\t: %ld KB (%s%s, %s, alias=%d)\n", cache_info.dc_size/1024, (cache_info.dc_conf.cc_wt ? "WT":"WB"), (cache_info.dc_conf.cc_sh ? ", shared I/D":""), ((cache_info.dc_loop == 1) ? "direct mapped" : buf), cache_info.dc_conf.cc_alias ); seq_printf(m, "ITLB entries\t: %ld\n" "DTLB entries\t: %ld%s\n", cache_info.it_size, cache_info.dt_size, cache_info.dt_conf.tc_sh ? " - shared with ITLB":"" ); #ifndef CONFIG_PA20 /* BTLB - Block TLB */ if (btlb_info.max_size==0) { seq_printf(m, "BTLB\t\t: not supported\n" ); } else { seq_printf(m, "BTLB fixed\t: max. %d pages, pagesize=%d (%dMB)\n" "BTLB fix-entr.\t: %d instruction, %d data (%d combined)\n" "BTLB var-entr.\t: %d instruction, %d data (%d combined)\n", btlb_info.max_size, (int)4096, btlb_info.max_size>>8, btlb_info.fixed_range_info.num_i, btlb_info.fixed_range_info.num_d, btlb_info.fixed_range_info.num_comb, btlb_info.variable_range_info.num_i, btlb_info.variable_range_info.num_d, btlb_info.variable_range_info.num_comb ); } #endif } void __init parisc_cache_init(void) { if (pdc_cache_info(&cache_info) < 0) panic("parisc_cache_init: pdc_cache_info failed"); #if 0 printk("ic_size %lx dc_size %lx it_size %lx\n", cache_info.ic_size, cache_info.dc_size, cache_info.it_size); printk("DC base 0x%lx stride 0x%lx count 0x%lx loop 0x%lx\n", cache_info.dc_base, cache_info.dc_stride, cache_info.dc_count, cache_info.dc_loop); printk("dc_conf = 0x%lx alias %d blk %d line %d shift %d\n", *(unsigned long *) (&cache_info.dc_conf), cache_info.dc_conf.cc_alias, cache_info.dc_conf.cc_block, cache_info.dc_conf.cc_line, cache_info.dc_conf.cc_shift); printk(" wt %d sh %d cst %d hv %d\n", cache_info.dc_conf.cc_wt, cache_info.dc_conf.cc_sh, cache_info.dc_conf.cc_cst, cache_info.dc_conf.cc_hv); printk("IC base 0x%lx stride 0x%lx count 0x%lx loop 0x%lx\n", cache_info.ic_base, cache_info.ic_stride, cache_info.ic_count, cache_info.ic_loop); printk("IT base 0x%lx stride 0x%lx count 0x%lx loop 0x%lx off_base 0x%lx off_stride 0x%lx off_count 0x%lx\n", cache_info.it_sp_base, cache_info.it_sp_stride, cache_info.it_sp_count, cache_info.it_loop, cache_info.it_off_base, cache_info.it_off_stride, cache_info.it_off_count); printk("DT base 0x%lx stride 0x%lx count 0x%lx loop 0x%lx off_base 0x%lx off_stride 0x%lx off_count 0x%lx\n", cache_info.dt_sp_base, cache_info.dt_sp_stride, cache_info.dt_sp_count, cache_info.dt_loop, cache_info.dt_off_base, cache_info.dt_off_stride, cache_info.dt_off_count); printk("ic_conf = 0x%lx alias %d blk %d line %d shift %d\n", *(unsigned long *) (&cache_info.ic_conf), cache_info.ic_conf.cc_alias, cache_info.ic_conf.cc_block, cache_info.ic_conf.cc_line, cache_info.ic_conf.cc_shift); printk(" wt %d sh %d cst %d hv %d\n", cache_info.ic_conf.cc_wt, cache_info.ic_conf.cc_sh, cache_info.ic_conf.cc_cst, cache_info.ic_conf.cc_hv); printk("D-TLB conf: sh %d page %d cst %d aid %d sr %d\n", cache_info.dt_conf.tc_sh, cache_info.dt_conf.tc_page, cache_info.dt_conf.tc_cst, cache_info.dt_conf.tc_aid, cache_info.dt_conf.tc_sr); printk("I-TLB conf: sh %d page %d cst %d aid %d sr %d\n", cache_info.it_conf.tc_sh, cache_info.it_conf.tc_page, cache_info.it_conf.tc_cst, cache_info.it_conf.tc_aid, cache_info.it_conf.tc_sr); #endif split_tlb = 0; if (cache_info.dt_conf.tc_sh == 0 || cache_info.dt_conf.tc_sh == 2) { if (cache_info.dt_conf.tc_sh == 2) printk(KERN_WARNING "Unexpected TLB configuration. " "Will flush I/D separately (could be optimized).\n"); split_tlb = 1; } /* "New and Improved" version from Jim Hull * (1 << (cc_block-1)) * (cc_line << (4 + cnf.cc_shift)) * The following CAFL_STRIDE is an optimized version, see * http://lists.parisc-linux.org/pipermail/parisc-linux/2004-June/023625.html * http://lists.parisc-linux.org/pipermail/parisc-linux/2004-June/023671.html */ #define CAFL_STRIDE(cnf) (cnf.cc_line << (3 + cnf.cc_block + cnf.cc_shift)) dcache_stride = CAFL_STRIDE(cache_info.dc_conf); icache_stride = CAFL_STRIDE(cache_info.ic_conf); #undef CAFL_STRIDE if ((boot_cpu_data.pdc.capabilities & PDC_MODEL_NVA_MASK) == PDC_MODEL_NVA_UNSUPPORTED) { printk(KERN_WARNING "parisc_cache_init: Only equivalent aliasing supported!\n"); #if 0 panic("SMP kernel required to avoid non-equivalent aliasing"); #endif } } void disable_sr_hashing(void) { int srhash_type, retval; unsigned long space_bits; switch (boot_cpu_data.cpu_type) { case pcx: /* We shouldn't get this far. setup.c should prevent it. */ BUG(); return; case pcxs: case pcxt: case pcxt_: srhash_type = SRHASH_PCXST; break; case pcxl: srhash_type = SRHASH_PCXL; break; case pcxl2: /* pcxl2 doesn't support space register hashing */ return; default: /* Currently all PA2.0 machines use the same ins. sequence */ srhash_type = SRHASH_PA20; break; } disable_sr_hashing_asm(srhash_type); retval = pdc_spaceid_bits(&space_bits); /* If this procedure isn't implemented, don't panic. */ if (retval < 0 && retval != PDC_BAD_OPTION) panic("pdc_spaceid_bits call failed.\n"); if (space_bits != 0) panic("SpaceID hashing is still on!\n"); } static inline void __flush_cache_page(struct vm_area_struct *vma, unsigned long vmaddr, unsigned long physaddr) { if (!static_branch_likely(&parisc_has_cache)) return; preempt_disable(); flush_dcache_page_asm(physaddr, vmaddr); if (vma->vm_flags & VM_EXEC) flush_icache_page_asm(physaddr, vmaddr); preempt_enable(); } static void flush_user_cache_page(struct vm_area_struct *vma, unsigned long vmaddr) { unsigned long flags, space, pgd, prot; #ifdef CONFIG_TLB_PTLOCK unsigned long pgd_lock; #endif vmaddr &= PAGE_MASK; preempt_disable(); /* Set context for flush */ local_irq_save(flags); prot = mfctl(8); space = mfsp(SR_USER); pgd = mfctl(25); #ifdef CONFIG_TLB_PTLOCK pgd_lock = mfctl(28); #endif switch_mm_irqs_off(NULL, vma->vm_mm, NULL); local_irq_restore(flags); flush_user_dcache_range_asm(vmaddr, vmaddr + PAGE_SIZE); if (vma->vm_flags & VM_EXEC) flush_user_icache_range_asm(vmaddr, vmaddr + PAGE_SIZE); flush_tlb_page(vma, vmaddr); /* Restore previous context */ local_irq_save(flags); #ifdef CONFIG_TLB_PTLOCK mtctl(pgd_lock, 28); #endif mtctl(pgd, 25); mtsp(space, SR_USER); mtctl(prot, 8); local_irq_restore(flags); preempt_enable(); } void flush_icache_pages(struct vm_area_struct *vma, struct page *page, unsigned int nr) { void *kaddr = page_address(page); for (;;) { flush_kernel_dcache_page_addr(kaddr); flush_kernel_icache_page(kaddr); if (--nr == 0) break; kaddr += PAGE_SIZE; } } static inline pte_t *get_ptep(struct mm_struct *mm, unsigned long addr) { pte_t *ptep = NULL; pgd_t *pgd = mm->pgd; p4d_t *p4d; pud_t *pud; pmd_t *pmd; if (!pgd_none(*pgd)) { p4d = p4d_offset(pgd, addr); if (!p4d_none(*p4d)) { pud = pud_offset(p4d, addr); if (!pud_none(*pud)) { pmd = pmd_offset(pud, addr); if (!pmd_none(*pmd)) ptep = pte_offset_map(pmd, addr); } } } return ptep; } static inline bool pte_needs_flush(pte_t pte) { return (pte_val(pte) & (_PAGE_PRESENT | _PAGE_ACCESSED | _PAGE_NO_CACHE)) == (_PAGE_PRESENT | _PAGE_ACCESSED); } void flush_dcache_folio(struct folio *folio) { struct address_space *mapping = folio_flush_mapping(folio); struct vm_area_struct *vma; unsigned long addr, old_addr = 0; void *kaddr; unsigned long count = 0; unsigned long i, nr, flags; pgoff_t pgoff; if (mapping && !mapping_mapped(mapping)) { set_bit(PG_dcache_dirty, &folio->flags); return; } nr = folio_nr_pages(folio); kaddr = folio_address(folio); for (i = 0; i < nr; i++) flush_kernel_dcache_page_addr(kaddr + i * PAGE_SIZE); if (!mapping) return; pgoff = folio->index; /* * We have carefully arranged in arch_get_unmapped_area() that * *any* mappings of a file are always congruently mapped (whether * declared as MAP_PRIVATE or MAP_SHARED), so we only need * to flush one address here for them all to become coherent * on machines that support equivalent aliasing */ flush_dcache_mmap_lock_irqsave(mapping, flags); vma_interval_tree_foreach(vma, &mapping->i_mmap, pgoff, pgoff + nr - 1) { unsigned long offset = pgoff - vma->vm_pgoff; unsigned long pfn = folio_pfn(folio); addr = vma->vm_start; nr = folio_nr_pages(folio); if (offset > -nr) { pfn -= offset; nr += offset; } else { addr += offset * PAGE_SIZE; } if (addr + nr * PAGE_SIZE > vma->vm_end) nr = (vma->vm_end - addr) / PAGE_SIZE; if (parisc_requires_coherency()) { for (i = 0; i < nr; i++) { pte_t *ptep = get_ptep(vma->vm_mm, addr + i * PAGE_SIZE); if (!ptep) continue; if (pte_needs_flush(*ptep)) flush_user_cache_page(vma, addr + i * PAGE_SIZE); /* Optimise accesses to the same table? */ pte_unmap(ptep); } } else { /* * The TLB is the engine of coherence on parisc: * The CPU is entitled to speculate any page * with a TLB mapping, so here we kill the * mapping then flush the page along a special * flush only alias mapping. This guarantees that * the page is no-longer in the cache for any * process and nor may it be speculatively read * in (until the user or kernel specifically * accesses it, of course) */ for (i = 0; i < nr; i++) flush_tlb_page(vma, addr + i * PAGE_SIZE); if (old_addr == 0 || (old_addr & (SHM_COLOUR - 1)) != (addr & (SHM_COLOUR - 1))) { for (i = 0; i < nr; i++) __flush_cache_page(vma, addr + i * PAGE_SIZE, (pfn + i) * PAGE_SIZE); /* * Software is allowed to have any number * of private mappings to a page. */ if (!(vma->vm_flags & VM_SHARED)) continue; if (old_addr) pr_err("INEQUIVALENT ALIASES 0x%lx and 0x%lx in file %pD\n", old_addr, addr, vma->vm_file); if (nr == folio_nr_pages(folio)) old_addr = addr; }