diff options
Diffstat (limited to 'arch/tile/mm/homecache.c')
| -rw-r--r-- | arch/tile/mm/homecache.c | 428 |
1 files changed, 0 insertions, 428 deletions
diff --git a/arch/tile/mm/homecache.c b/arch/tile/mm/homecache.c deleted file mode 100644 index 4432f31e8479..000000000000 --- a/arch/tile/mm/homecache.c +++ /dev/null @@ -1,428 +0,0 @@ -/* - * Copyright 2010 Tilera Corporation. All Rights Reserved. - * - * This program is free software; you can redistribute it and/or - * modify it under the terms of the GNU General Public License - * as published by the Free Software Foundation, version 2. - * - * This program is distributed in the hope that it will be useful, but - * WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or - * NON INFRINGEMENT. See the GNU General Public License for - * more details. - * - * This code maintains the "home" for each page in the system. - */ - -#include <linux/kernel.h> -#include <linux/mm.h> -#include <linux/spinlock.h> -#include <linux/list.h> -#include <linux/bootmem.h> -#include <linux/rmap.h> -#include <linux/pagemap.h> -#include <linux/mutex.h> -#include <linux/interrupt.h> -#include <linux/sysctl.h> -#include <linux/pagevec.h> -#include <linux/ptrace.h> -#include <linux/timex.h> -#include <linux/cache.h> -#include <linux/smp.h> -#include <linux/module.h> -#include <linux/hugetlb.h> - -#include <asm/page.h> -#include <asm/sections.h> -#include <asm/tlbflush.h> -#include <asm/pgalloc.h> -#include <asm/homecache.h> - -#include <arch/sim.h> - -#include "migrate.h" - - -/* - * The noallocl2 option suppresses all use of the L2 cache to cache - * locally from a remote home. - */ -static int __ro_after_init noallocl2; -static int __init set_noallocl2(char *str) -{ - noallocl2 = 1; - return 0; -} -early_param("noallocl2", set_noallocl2); - - -/* - * Update the irq_stat for cpus that we are going to interrupt - * with TLB or cache flushes. Also handle removing dataplane cpus - * from the TLB flush set, and setting dataplane_tlb_state instead. - */ -static void hv_flush_update(const struct cpumask *cache_cpumask, - struct cpumask *tlb_cpumask, - unsigned long tlb_va, unsigned long tlb_length, - HV_Remote_ASID *asids, int asidcount) -{ - struct cpumask mask; - int i, cpu; - - cpumask_clear(&mask); - if (cache_cpumask) - cpumask_or(&mask, &mask, cache_cpumask); - if (tlb_cpumask && tlb_length) { - cpumask_or(&mask, &mask, tlb_cpumask); - } - - for (i = 0; i < asidcount; ++i) - cpumask_set_cpu(asids[i].y * smp_width + asids[i].x, &mask); - - /* - * Don't bother to update atomically; losing a count - * here is not that critical. - */ - for_each_cpu(cpu, &mask) - ++per_cpu(irq_stat, cpu).irq_hv_flush_count; -} - -/* - * This wrapper function around hv_flush_remote() does several things: - * - * - Provides a return value error-checking panic path, since - * there's never any good reason for hv_flush_remote() to fail. - * - Accepts a 32-bit PFN rather than a 64-bit PA, which generally - * is the type that Linux wants to pass around anyway. - * - Canonicalizes that lengths of zero make cpumasks NULL. - * - Handles deferring TLB flushes for dataplane tiles. - * - Tracks remote interrupts in the per-cpu irq_cpustat_t. - * - * Note that we have to wait until the cache flush completes before - * updating the per-cpu last_cache_flush word, since otherwise another - * concurrent flush can race, conclude the flush has already - * completed, and start to use the page while it's still dirty - * remotely (running concurrently with the actual evict, presumably). - */ -void flush_remote(unsigned long cache_pfn, unsigned long cache_control, - const struct cpumask *cache_cpumask_orig, - HV_VirtAddr tlb_va, unsigned long tlb_length, - unsigned long tlb_pgsize, - const struct cpumask *tlb_cpumask_orig, - HV_Remote_ASID *asids, int asidcount) -{ - int rc; - struct cpumask cache_cpumask_copy, tlb_cpumask_copy; - struct cpumask *cache_cpumask, *tlb_cpumask; - HV_PhysAddr cache_pa; - - mb(); /* provided just to simplify "magic hypervisor" mode */ - - /* - * Canonicalize and copy the cpumasks. - */ - if (cache_cpumask_orig && cache_control) { - cpumask_copy(&cache_cpumask_copy, cache_cpumask_orig); - cache_cpumask = &cache_cpumask_copy; - } else { - cpumask_clear(&cache_cpumask_copy); - cache_cpumask = NULL; - } - if (cache_cpumask == NULL) - cache_control = 0; - if (tlb_cpumask_orig && tlb_length) { - cpumask_copy(&tlb_cpumask_copy, tlb_cpumask_orig); - tlb_cpumask = &tlb_cpumask_copy; - } else { - cpumask_clear(&tlb_cpumask_copy); - tlb_cpumask = NULL; - } - - hv_flush_update(cache_cpumask, tlb_cpumask, tlb_va, tlb_length, - asids, asidcount); - cache_pa = (HV_PhysAddr)cache_pfn << PAGE_SHIFT; - rc = hv_flush_remote(cache_pa, cache_control, - cpumask_bits(cache_cpumask), - tlb_va, tlb_length, tlb_pgsize, - cpumask_bits(tlb_cpumask), - asids, asidcount); - if (rc == 0) - return; - - pr_err("hv_flush_remote(%#llx, %#lx, %p [%*pb], %#lx, %#lx, %#lx, %p [%*pb], %p, %d) = %d\n", - cache_pa, cache_control, cache_cpumask, - cpumask_pr_args(&cache_cpumask_copy), - (unsigned long)tlb_va, tlb_length, tlb_pgsize, tlb_cpumask, - cpumask_pr_args(&tlb_cpumask_copy), asids, asidcount, rc); - panic("Unsafe to continue."); -} - -static void homecache_finv_page_va(void* va, int home) -{ - int cpu = get_cpu(); - if (home == cpu) { - finv_buffer_local(va, PAGE_SIZE); - } else if (home == PAGE_HOME_HASH) { - finv_buffer_remote(va, PAGE_SIZE, 1); - } else { - BUG_ON(home < 0 || home >= NR_CPUS); - finv_buffer_remote(va, PAGE_SIZE, 0); - } - put_cpu(); -} - -void homecache_finv_map_page(struct page *page, int home) -{ - unsigned long flags; - unsigned long va; - pte_t *ptep; - pte_t pte; - - if (home == PAGE_HOME_UNCACHED) - return; - local_irq_save(flags); -#ifdef CONFIG_HIGHMEM - va = __fix_to_virt(FIX_KMAP_BEGIN + kmap_atomic_idx_push() + - (KM_TYPE_NR * smp_processor_id())); -#else - va = __fix_to_virt(FIX_HOMECACHE_BEGIN + smp_processor_id()); -#endif - ptep = virt_to_kpte(va); - pte = pfn_pte(page_to_pfn(page), PAGE_KERNEL); - __set_pte(ptep, pte_set_home(pte, home)); - homecache_finv_page_va((void *)va, home); - __pte_clear(ptep); - hv_flush_page(va, PAGE_SIZE); -#ifdef CONFIG_HIGHMEM - kmap_atomic_idx_pop(); -#endif - local_irq_restore(flags); -} - -static void homecache_finv_page_home(struct page *page, int home) -{ - if (!PageHighMem(page) && home == page_home(page)) - homecache_finv_page_va(page_address(page), home); - else - homecache_finv_map_page(page, home); -} - -static inline bool incoherent_home(int home) -{ - return home == PAGE_HOME_IMMUTABLE || home == PAGE_HOME_INCOHERENT; -} - -static void homecache_finv_page_internal(struct page *page, int force_map) -{ - int home = page_home(page); - if (home == PAGE_HOME_UNCACHED) - return; - if (incoherent_home(home)) { - int cpu; - for_each_cpu(cpu, &cpu_cacheable_map) - homecache_finv_map_page(page, cpu); - } else if (force_map) { - /* Force if, e.g., the normal mapping is migrating. */ - homecache_finv_map_page(page, home); - } else { - homecache_finv_page_home(page, home); - } - sim_validate_lines_evicted(PFN_PHYS(page_to_pfn(page)), PAGE_SIZE); -} - -void homecache_finv_page(struct page *page) -{ - homecache_finv_page_internal(page, 0); -} - -void homecache_evict(const struct cpumask *mask) -{ - flush_remote(0, HV_FLUSH_EVICT_L2, mask, 0, 0, 0, NULL, NULL, 0); -} - -/* Report the home corresponding to a given PTE. */ -static int pte_to_home(pte_t pte) -{ - if (hv_pte_get_nc(pte)) - return PAGE_HOME_IMMUTABLE; - switch (hv_pte_get_mode(pte)) { - case HV_PTE_MODE_CACHE_TILE_L3: - return get_remote_cache_cpu(pte); - case HV_PTE_MODE_CACHE_NO_L3: - return PAGE_HOME_INCOHERENT; - case HV_PTE_MODE_UNCACHED: - return PAGE_HOME_UNCACHED; - case HV_PTE_MODE_CACHE_HASH_L3: - return PAGE_HOME_HASH; - } - panic("Bad PTE %#llx\n", pte.val); -} - -/* Update the home of a PTE if necessary (can also be used for a pgprot_t). */ -pte_t pte_set_home(pte_t pte, int home) -{ -#if CHIP_HAS_MMIO() - /* Check for MMIO mappings and pass them through. */ - if (hv_pte_get_mode(pte) == HV_PTE_MODE_MMIO) - return pte; -#endif - - - /* - * Only immutable pages get NC mappings. If we have a - * non-coherent PTE, but the underlying page is not - * immutable, it's likely the result of a forced - * caching setting running up against ptrace setting - * the page to be writable underneath. In this case, - * just keep the PTE coherent. - */ - if (hv_pte_get_nc(pte) && home != PAGE_HOME_IMMUTABLE) { - pte = hv_pte_clear_nc(pte); - pr_err("non-immutable page incoherently referenced: %#llx\n", - pte.val); - } - - switch (home) { - - case PAGE_HOME_UNCACHED: - pte = hv_pte_set_mode(pte, HV_PTE_MODE_UNCACHED); - break; - - case PAGE_HOME_INCOHERENT: - pte = hv_pte_set_mode(pte, HV_PTE_MODE_CACHE_NO_L3); - break; - - case PAGE_HOME_IMMUTABLE: - /* - * We could home this page anywhere, since it's immutable, - * but by default just home it to follow "hash_default". - */ - BUG_ON(hv_pte_get_writable(pte)); - if (pte_get_forcecache(pte)) { - /* Upgrade "force any cpu" to "No L3" for immutable. */ - if (hv_pte_get_mode(pte) == HV_PTE_MODE_CACHE_TILE_L3 - && pte_get_anyhome(pte)) { - pte = hv_pte_set_mode(pte, - HV_PTE_MODE_CACHE_NO_L3); - } - } else - if (hash_default) - pte = hv_pte_set_mode(pte, HV_PTE_MODE_CACHE_HASH_L3); - else - pte = hv_pte_set_mode(pte, HV_PTE_MODE_CACHE_NO_L3); - pte = hv_pte_set_nc(pte); - break; - - case PAGE_HOME_HASH: - pte = hv_pte_set_mode(pte, HV_PTE_MODE_CACHE_HASH_L3); - break; - - default: - BUG_ON(home < 0 || home >= NR_CPUS || - !cpu_is_valid_lotar(home)); - pte = hv_pte_set_mode(pte, HV_PTE_MODE_CACHE_TILE_L3); - pte = set_remote_cache_cpu(pte, home); - break; - } - - if (noallocl2) - pte = hv_pte_set_no_alloc_l2(pte); - - /* Simplify "no local and no l3" to "uncached" */ - if (hv_pte_get_no_alloc_l2(pte) && hv_pte_get_no_alloc_l1(pte) && - hv_pte_get_mode(pte) == HV_PTE_MODE_CACHE_NO_L3) { - pte = hv_pte_set_mode(pte, HV_PTE_MODE_UNCACHED); - } - - /* Checking this case here gives a better panic than from the hv. */ - BUG_ON(hv_pte_get_mode(pte) == 0); - - return pte; -} -EXPORT_SYMBOL(pte_set_home); - -/* - * The routines in this section are the "static" versions of the normal - * dynamic homecaching routines; they just set the home cache - * of a kernel page once, and require a full-chip cache/TLB flush, - * so they're not suitable for anything but infrequent use. - */ - -int page_home(struct page *page) -{ - if (PageHighMem(page)) { - return PAGE_HOME_HASH; - } else { - unsigned long kva = (unsigned long)page_address(page); - return pte_to_home(*virt_to_kpte(kva)); - } -} -EXPORT_SYMBOL(page_home); - -void homecache_change_page_home(struct page *page, int order, int home) -{ - int i, pages = (1 << order); - unsigned long kva; - - BUG_ON(PageHighMem(page)); - BUG_ON(page_count(page) > 1); - BUG_ON(page_mapcount(page) != 0); - kva = (unsigned long) page_address(page); - flush_remote(0, HV_FLUSH_EVICT_L2, &cpu_cacheable_map, - kva, pages * PAGE_SIZE, PAGE_SIZE, cpu_online_mask, - NULL, 0); - - for (i = 0; i < pages; ++i, kva += PAGE_SIZE) { - pte_t *ptep = virt_to_kpte(kva); - pte_t pteval = *ptep; - BUG_ON(!pte_present(pteval) || pte_huge(pteval)); - __set_pte(ptep, pte_set_home(pteval, home)); - } -} -EXPORT_SYMBOL(homecache_change_page_home); - -struct page *homecache_alloc_pages(gfp_t gfp_mask, - unsigned int order, int home) -{ - struct page *page; - BUG_ON(gfp_mask & __GFP_HIGHMEM); /* must be lowmem */ - page = alloc_pages(gfp_mask, order); - if (page) - homecache_change_page_home(page, order, home); - return page; -} -EXPORT_SYMBOL(homecache_alloc_pages); - -struct page *homecache_alloc_pages_node(int nid, gfp_t gfp_mask, - unsigned int order, int home) -{ - struct page *page; - BUG_ON(gfp_mask & __GFP_HIGHMEM); /* must be lowmem */ - page = alloc_pages_node(nid, gfp_mask, order); - if (page) - homecache_change_page_home(page, order, home); - return page; -} - -void __homecache_free_pages(struct page *page, unsigned int order) -{ - if (put_page_testzero(page)) { - homecache_change_page_home(page, order, PAGE_HOME_HASH); - if (order == 0) { - free_unref_page(page); - } else { - init_page_count(page); - __free_pages(page, order); - } - } -} -EXPORT_SYMBOL(__homecache_free_pages); - -void homecache_free_pages(unsigned long addr, unsigned int order) -{ - if (addr != 0) { - VM_BUG_ON(!virt_addr_valid((void *)addr)); - __homecache_free_pages(virt_to_page((void *)addr), order); - } -} -EXPORT_SYMBOL(homecache_free_pages); |