From owner-svn-src-stable@freebsd.org Tue Jun 4 17:31:07 2019 Return-Path: Delivered-To: svn-src-stable@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id 69E8315B84E9; Tue, 4 Jun 2019 17:31:07 +0000 (UTC) (envelope-from markj@FreeBSD.org) Received: from mxrelay.nyi.freebsd.org (mxrelay.nyi.freebsd.org [IPv6:2610:1c1:1:606c::19:3]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) server-signature RSA-PSS (4096 bits) client-signature RSA-PSS (4096 bits) client-digest SHA256) (Client CN "mxrelay.nyi.freebsd.org", Issuer "Let's Encrypt Authority X3" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 1A11C74C5B; Tue, 4 Jun 2019 17:31:07 +0000 (UTC) (envelope-from markj@FreeBSD.org) Received: from repo.freebsd.org (repo.freebsd.org [IPv6:2610:1c1:1:6068::e6a:0]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by mxrelay.nyi.freebsd.org (Postfix) with ESMTPS id D0F6C20B07; Tue, 4 Jun 2019 17:31:06 +0000 (UTC) (envelope-from markj@FreeBSD.org) Received: from repo.freebsd.org ([127.0.1.37]) by repo.freebsd.org (8.15.2/8.15.2) with ESMTP id x54HV65H099084; Tue, 4 Jun 2019 17:31:06 GMT (envelope-from markj@FreeBSD.org) Received: (from markj@localhost) by repo.freebsd.org (8.15.2/8.15.2/Submit) id x54HV5RM099075; Tue, 4 Jun 2019 17:31:05 GMT (envelope-from markj@FreeBSD.org) Message-Id: <201906041731.x54HV5RM099075@repo.freebsd.org> X-Authentication-Warning: repo.freebsd.org: markj set sender to markj@FreeBSD.org using -f From: Mark Johnston Date: Tue, 4 Jun 2019 17:31:05 +0000 (UTC) To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-12@freebsd.org Subject: svn commit: r348644 - in stable/12/sys: riscv/include riscv/riscv vm X-SVN-Group: stable-12 X-SVN-Commit-Author: markj X-SVN-Commit-Paths: in stable/12/sys: riscv/include riscv/riscv vm X-SVN-Commit-Revision: 348644 X-SVN-Commit-Repository: base MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-Rspamd-Queue-Id: 1A11C74C5B X-Spamd-Bar: -- Authentication-Results: mx1.freebsd.org X-Spamd-Result: default: False [-2.98 / 15.00]; local_wl_from(0.00)[FreeBSD.org]; NEURAL_HAM_MEDIUM(-1.00)[-1.000,0]; NEURAL_HAM_SHORT(-0.98)[-0.978,0]; ASN(0.00)[asn:11403, ipnet:2610:1c1:1::/48, country:US]; NEURAL_HAM_LONG(-1.00)[-1.000,0] X-BeenThere: svn-src-stable@freebsd.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: SVN commit messages for all the -stable branches of the src tree List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 04 Jun 2019 17:31:07 -0000 Author: markj Date: Tue Jun 4 17:31:05 2019 New Revision: 348644 URL: https://svnweb.freebsd.org/changeset/base/348644 Log: MFC r344106: Implement transparent 2MB superpage promotion for RISC-V. Modified: stable/12/sys/riscv/include/param.h stable/12/sys/riscv/include/pmap.h stable/12/sys/riscv/include/pte.h stable/12/sys/riscv/include/vmparam.h stable/12/sys/riscv/riscv/pmap.c stable/12/sys/vm/vm_fault.c Directory Properties: stable/12/ (props changed) Modified: stable/12/sys/riscv/include/param.h ============================================================================== --- stable/12/sys/riscv/include/param.h Tue Jun 4 17:30:22 2019 (r348643) +++ stable/12/sys/riscv/include/param.h Tue Jun 4 17:31:05 2019 (r348644) @@ -82,7 +82,7 @@ #define PAGE_SIZE (1 << PAGE_SHIFT) /* Page size */ #define PAGE_MASK (PAGE_SIZE - 1) -#define MAXPAGESIZES 1 /* maximum number of supported page sizes */ +#define MAXPAGESIZES 3 /* maximum number of supported page sizes */ #ifndef KSTACK_PAGES #define KSTACK_PAGES 4 /* pages of kernel stack (with pcb) */ Modified: stable/12/sys/riscv/include/pmap.h ============================================================================== --- stable/12/sys/riscv/include/pmap.h Tue Jun 4 17:30:22 2019 (r348643) +++ stable/12/sys/riscv/include/pmap.h Tue Jun 4 17:31:05 2019 (r348644) @@ -44,6 +44,8 @@ #include #include +#include + #ifdef _KERNEL #define vtophys(va) pmap_kextract((vm_offset_t)(va)) @@ -80,6 +82,7 @@ struct pmap { pd_entry_t *pm_l1; TAILQ_HEAD(,pv_chunk) pm_pvchunk; /* list of mappings in pmap */ LIST_ENTRY(pmap) pm_list; /* List of all pmaps */ + struct vm_radix pm_root; }; typedef struct pv_entry { @@ -139,6 +142,7 @@ void pmap_kenter_device(vm_offset_t, vm_size_t, vm_pad vm_paddr_t pmap_kextract(vm_offset_t va); void pmap_kremove(vm_offset_t); void pmap_kremove_device(vm_offset_t, vm_size_t); +bool pmap_ps_enabled(pmap_t); void *pmap_mapdev(vm_offset_t, vm_size_t); void *pmap_mapbios(vm_paddr_t, vm_size_t); Modified: stable/12/sys/riscv/include/pte.h ============================================================================== --- stable/12/sys/riscv/include/pte.h Tue Jun 4 17:30:22 2019 (r348643) +++ stable/12/sys/riscv/include/pte.h Tue Jun 4 17:31:05 2019 (r348644) @@ -62,7 +62,8 @@ typedef uint64_t pn_t; /* page number */ #define L3_SIZE (1 << L3_SHIFT) #define L3_OFFSET (L3_SIZE - 1) -#define Ln_ENTRIES (1 << 9) +#define Ln_ENTRIES_SHIFT 9 +#define Ln_ENTRIES (1 << Ln_ENTRIES_SHIFT) #define Ln_ADDR_MASK (Ln_ENTRIES - 1) /* Bits 9:8 are reserved for software */ @@ -79,6 +80,8 @@ typedef uint64_t pn_t; /* page number */ #define PTE_RWX (PTE_R | PTE_W | PTE_X) #define PTE_RX (PTE_R | PTE_X) #define PTE_KERN (PTE_V | PTE_R | PTE_W | PTE_A | PTE_D) +#define PTE_PROMOTE (PTE_V | PTE_RWX | PTE_D | PTE_A | PTE_G | PTE_U | \ + PTE_SW_MANAGED | PTE_SW_WIRED) #define PTE_PPN0_S 10 #define PTE_PPN1_S 19 Modified: stable/12/sys/riscv/include/vmparam.h ============================================================================== --- stable/12/sys/riscv/include/vmparam.h Tue Jun 4 17:30:22 2019 (r348643) +++ stable/12/sys/riscv/include/vmparam.h Tue Jun 4 17:31:05 2019 (r348644) @@ -99,10 +99,10 @@ #define VM_NFREEORDER 12 /* - * Disable superpage reservations. + * Enable superpage reservations: 1 level. */ #ifndef VM_NRESERVLEVEL -#define VM_NRESERVLEVEL 0 +#define VM_NRESERVLEVEL 1 #endif /* Modified: stable/12/sys/riscv/riscv/pmap.c ============================================================================== --- stable/12/sys/riscv/riscv/pmap.c Tue Jun 4 17:30:22 2019 (r348643) +++ stable/12/sys/riscv/riscv/pmap.c Tue Jun 4 17:31:05 2019 (r348644) @@ -118,6 +118,7 @@ __FBSDID("$FreeBSD$"); */ #include +#include #include #include #include @@ -145,6 +146,7 @@ __FBSDID("$FreeBSD$"); #include #include #include +#include #include #include #include @@ -154,9 +156,8 @@ __FBSDID("$FreeBSD$"); #include #include -#define NPDEPG (PAGE_SIZE/(sizeof (pd_entry_t))) -#define NUPDE (NPDEPG * NPDEPG) -#define NUSERPGTBLS (NUPDE + NPDEPG) +#define NUL1E (Ln_ENTRIES * Ln_ENTRIES) +#define NUL2E (Ln_ENTRIES * NUL1E) #if !defined(DIAGNOSTIC) #ifdef __GNUC_GNU_INLINE__ @@ -175,11 +176,12 @@ __FBSDID("$FreeBSD$"); #endif #define pmap_l2_pindex(v) ((v) >> L2_SHIFT) +#define pa_to_pvh(pa) (&pv_table[pa_index(pa)]) #define NPV_LIST_LOCKS MAXCPU #define PHYS_TO_PV_LIST_LOCK(pa) \ - (&pv_list_locks[pa_index(pa) % NPV_LIST_LOCKS]) + (&pv_list_locks[pmap_l2_pindex(pa) % NPV_LIST_LOCKS]) #define CHANGE_PV_LIST_LOCK_TO_PHYS(lockp, pa) do { \ struct rwlock **_lockp = (lockp); \ @@ -230,13 +232,52 @@ CTASSERT((DMAP_MAX_ADDRESS & ~L1_OFFSET) == DMAP_MAX_ static struct rwlock_padalign pvh_global_lock; static struct mtx_padalign allpmaps_lock; +static SYSCTL_NODE(_vm, OID_AUTO, pmap, CTLFLAG_RD, 0, + "VM/pmap parameters"); + +static int superpages_enabled = 1; +SYSCTL_INT(_vm_pmap, OID_AUTO, superpages_enabled, + CTLFLAG_RDTUN, &superpages_enabled, 0, + "Enable support for transparent superpages"); + +static SYSCTL_NODE(_vm_pmap, OID_AUTO, l2, CTLFLAG_RD, 0, + "2MB page mapping counters"); + +static u_long pmap_l2_demotions; +SYSCTL_ULONG(_vm_pmap_l2, OID_AUTO, demotions, CTLFLAG_RD, + &pmap_l2_demotions, 0, + "2MB page demotions"); + +static u_long pmap_l2_mappings; +SYSCTL_ULONG(_vm_pmap_l2, OID_AUTO, mappings, CTLFLAG_RD, + &pmap_l2_mappings, 0, + "2MB page mappings"); + +static u_long pmap_l2_p_failures; +SYSCTL_ULONG(_vm_pmap_l2, OID_AUTO, p_failures, CTLFLAG_RD, + &pmap_l2_p_failures, 0, + "2MB page promotion failures"); + +static u_long pmap_l2_promotions; +SYSCTL_ULONG(_vm_pmap_l2, OID_AUTO, promotions, CTLFLAG_RD, + &pmap_l2_promotions, 0, + "2MB page promotions"); + /* * Data for the pv entry allocation mechanism */ static TAILQ_HEAD(pch, pv_chunk) pv_chunks = TAILQ_HEAD_INITIALIZER(pv_chunks); static struct mtx pv_chunks_mutex; static struct rwlock pv_list_locks[NPV_LIST_LOCKS]; +static struct md_page *pv_table; +static struct md_page pv_dummy; +/* + * Internal flags for pmap_enter()'s helper functions. + */ +#define PMAP_ENTER_NORECLAIM 0x1000000 /* Don't reclaim PV entries. */ +#define PMAP_ENTER_NOREPLACE 0x2000000 /* Don't replace mappings. */ + static void free_pv_chunk(struct pv_chunk *pc); static void free_pv_entry(pmap_t pmap, pv_entry_t pv); static pv_entry_t get_pv_entry(pmap_t pmap, struct rwlock **lockp); @@ -244,6 +285,11 @@ static vm_page_t reclaim_pv_chunk(pmap_t locked_pmap, static void pmap_pvh_free(struct md_page *pvh, pmap_t pmap, vm_offset_t va); static pv_entry_t pmap_pvh_remove(struct md_page *pvh, pmap_t pmap, vm_offset_t va); +static bool pmap_demote_l2(pmap_t pmap, pd_entry_t *l2, vm_offset_t va); +static bool pmap_demote_l2_locked(pmap_t pmap, pd_entry_t *l2, + vm_offset_t va, struct rwlock **lockp); +static int pmap_enter_l2(pmap_t pmap, vm_offset_t va, pd_entry_t new_l2, + u_int flags, vm_page_t m, struct rwlock **lockp); static vm_page_t pmap_enter_quick_locked(pmap_t pmap, vm_offset_t va, vm_page_t m, vm_prot_t prot, vm_page_t mpte, struct rwlock **lockp); static int pmap_remove_l3(pmap_t pmap, pt_entry_t *l3, vm_offset_t sva, @@ -254,9 +300,9 @@ static boolean_t pmap_try_insert_pv_entry(pmap_t pmap, static vm_page_t _pmap_alloc_l3(pmap_t pmap, vm_pindex_t ptepindex, struct rwlock **lockp); -static void _pmap_unwire_l3(pmap_t pmap, vm_offset_t va, vm_page_t m, +static void _pmap_unwire_ptp(pmap_t pmap, vm_offset_t va, vm_page_t m, struct spglist *free); -static int pmap_unuse_l3(pmap_t, vm_offset_t, pd_entry_t, struct spglist *); +static int pmap_unuse_pt(pmap_t, vm_offset_t, pd_entry_t, struct spglist *); #define pmap_clear(pte) pmap_store(pte, 0) #define pmap_clear_bits(pte, bits) atomic_clear_64(pte, bits) @@ -636,7 +682,8 @@ pmap_page_init(vm_page_t m) void pmap_init(void) { - int i; + vm_size_t s; + int i, pv_npg; /* * Initialize the pv chunk and pmap list mutexes. @@ -649,6 +696,24 @@ pmap_init(void) */ for (i = 0; i < NPV_LIST_LOCKS; i++) rw_init(&pv_list_locks[i], "pmap pv list"); + + /* + * Calculate the size of the pv head table for superpages. + */ + pv_npg = howmany(vm_phys_segs[vm_phys_nsegs - 1].end, L2_SIZE); + + /* + * Allocate memory for the pv head table for superpages. + */ + s = (vm_size_t)(pv_npg * sizeof(struct md_page)); + s = round_page(s); + pv_table = (struct md_page *)kmem_malloc(s, M_WAITOK | M_ZERO); + for (i = 0; i < pv_npg; i++) + TAILQ_INIT(&pv_table[i].pv_list); + TAILQ_INIT(&pv_dummy.pv_list); + + if (superpages_enabled) + pagesizes[1] = L2_SIZE; } #ifdef SMP @@ -999,6 +1064,13 @@ pmap_qremove(vm_offset_t sva, int count) pmap_invalidate_range(kernel_pmap, sva, va); } +bool +pmap_ps_enabled(pmap_t pmap __unused) +{ + + return (superpages_enabled); +} + /*************************************************** * Page table page management routines..... ***************************************************/ @@ -1018,6 +1090,34 @@ pmap_add_delayed_free_list(vm_page_t m, struct spglist m->flags &= ~PG_ZERO; SLIST_INSERT_HEAD(free, m, plinks.s.ss); } + +/* + * Inserts the specified page table page into the specified pmap's collection + * of idle page table pages. Each of a pmap's page table pages is responsible + * for mapping a distinct range of virtual addresses. The pmap's collection is + * ordered by this virtual address range. + */ +static __inline int +pmap_insert_pt_page(pmap_t pmap, vm_page_t ml3) +{ + + PMAP_LOCK_ASSERT(pmap, MA_OWNED); + return (vm_radix_insert(&pmap->pm_root, ml3)); +} + +/* + * Removes the page table page mapping the specified virtual address from the + * specified pmap's collection of idle page table pages, and returns it. + * Otherwise, returns NULL if there is no page table page corresponding to the + * specified virtual address. + */ +static __inline vm_page_t +pmap_remove_pt_page(pmap_t pmap, vm_offset_t va) +{ + + PMAP_LOCK_ASSERT(pmap, MA_OWNED); + return (vm_radix_remove(&pmap->pm_root, pmap_l2_pindex(va))); +} /* * Decrements a page table page's wire count, which is used to record the @@ -1026,12 +1126,12 @@ pmap_add_delayed_free_list(vm_page_t m, struct spglist * page table page was unmapped and FALSE otherwise. */ static inline boolean_t -pmap_unwire_l3(pmap_t pmap, vm_offset_t va, vm_page_t m, struct spglist *free) +pmap_unwire_ptp(pmap_t pmap, vm_offset_t va, vm_page_t m, struct spglist *free) { --m->wire_count; if (m->wire_count == 0) { - _pmap_unwire_l3(pmap, va, m, free); + _pmap_unwire_ptp(pmap, va, m, free); return (TRUE); } else { return (FALSE); @@ -1039,36 +1139,30 @@ pmap_unwire_l3(pmap_t pmap, vm_offset_t va, vm_page_t } static void -_pmap_unwire_l3(pmap_t pmap, vm_offset_t va, vm_page_t m, struct spglist *free) +_pmap_unwire_ptp(pmap_t pmap, vm_offset_t va, vm_page_t m, struct spglist *free) { vm_paddr_t phys; PMAP_LOCK_ASSERT(pmap, MA_OWNED); - /* - * unmap the page table page - */ - if (m->pindex >= NUPDE) { - /* PD page */ + if (m->pindex >= NUL1E) { pd_entry_t *l1; l1 = pmap_l1(pmap, va); pmap_clear(l1); pmap_distribute_l1(pmap, pmap_l1_index(va), 0); } else { - /* PTE page */ pd_entry_t *l2; l2 = pmap_l2(pmap, va); pmap_clear(l2); } pmap_resident_count_dec(pmap, 1); - if (m->pindex < NUPDE) { + if (m->pindex < NUL1E) { pd_entry_t *l1; - /* We just released a PT, unhold the matching PD */ vm_page_t pdpg; l1 = pmap_l1(pmap, va); phys = PTE_TO_PHYS(pmap_load(l1)); pdpg = PHYS_TO_VM_PAGE(phys); - pmap_unwire_l3(pmap, va, pdpg, free); + pmap_unwire_ptp(pmap, va, pdpg, free); } pmap_invalidate_page(pmap, va); @@ -1082,24 +1176,20 @@ _pmap_unwire_l3(pmap_t pmap, vm_offset_t va, vm_page_t } /* - * After removing an l3 entry, this routine is used to + * After removing a page table entry, this routine is used to * conditionally free the page, and manage the hold/wire counts. */ static int -pmap_unuse_l3(pmap_t pmap, vm_offset_t va, pd_entry_t ptepde, +pmap_unuse_pt(pmap_t pmap, vm_offset_t va, pd_entry_t ptepde, struct spglist *free) { - vm_paddr_t phys; vm_page_t mpte; if (va >= VM_MAXUSER_ADDRESS) return (0); KASSERT(ptepde != 0, ("pmap_unuse_pt: ptepde != 0")); - - phys = PTE_TO_PHYS(ptepde); - - mpte = PHYS_TO_VM_PAGE(phys); - return (pmap_unwire_l3(pmap, va, mpte, free)); + mpte = PHYS_TO_VM_PAGE(PTE_TO_PHYS(ptepde)); + return (pmap_unwire_ptp(pmap, va, mpte, free)); } void @@ -1140,6 +1230,8 @@ pmap_pinit(pmap_t pmap) LIST_INSERT_HEAD(&allpmaps, pmap, pm_list); mtx_unlock(&allpmaps_lock); + vm_radix_init(&pmap->pm_root); + return (1); } @@ -1193,11 +1285,11 @@ _pmap_alloc_l3(pmap_t pmap, vm_pindex_t ptepindex, str * it isn't already there. */ - if (ptepindex >= NUPDE) { + if (ptepindex >= NUL1E) { pd_entry_t *l1; vm_pindex_t l1index; - l1index = ptepindex - NUPDE; + l1index = ptepindex - NUL1E; l1 = &pmap->pm_l1[l1index]; pn = (VM_PAGE_TO_PHYS(m) / PAGE_SIZE); @@ -1213,7 +1305,7 @@ _pmap_alloc_l3(pmap_t pmap, vm_pindex_t ptepindex, str l1 = &pmap->pm_l1[l1index]; if (pmap_load(l1) == 0) { /* recurse for allocating page dir */ - if (_pmap_alloc_l3(pmap, NUPDE + l1index, + if (_pmap_alloc_l3(pmap, NUL1E + l1index, lockp) == NULL) { vm_page_unwire_noq(m); vm_page_free_zero(m); @@ -1241,6 +1333,29 @@ _pmap_alloc_l3(pmap_t pmap, vm_pindex_t ptepindex, str } static vm_page_t +pmap_alloc_l2(pmap_t pmap, vm_offset_t va, struct rwlock **lockp) +{ + pd_entry_t *l1; + vm_page_t l2pg; + vm_pindex_t l2pindex; + +retry: + l1 = pmap_l1(pmap, va); + if (l1 != NULL && (pmap_load(l1) & PTE_RWX) == 0) { + /* Add a reference to the L2 page. */ + l2pg = PHYS_TO_VM_PAGE(PTE_TO_PHYS(pmap_load(l1))); + l2pg->wire_count++; + } else { + /* Allocate a L2 page. */ + l2pindex = pmap_l2_pindex(va) >> Ln_ENTRIES_SHIFT; + l2pg = _pmap_alloc_l3(pmap, NUL2E + l2pindex, lockp); + if (l2pg == NULL && lockp != NULL) + goto retry; + } + return (l2pg); +} + +static vm_page_t pmap_alloc_l3(pmap_t pmap, vm_offset_t va, struct rwlock **lockp) { vm_pindex_t ptepindex; @@ -1599,6 +1714,79 @@ retry: } /* + * Ensure that the number of spare PV entries in the specified pmap meets or + * exceeds the given count, "needed". + * + * The given PV list lock may be released. + */ +static void +reserve_pv_entries(pmap_t pmap, int needed, struct rwlock **lockp) +{ + struct pch new_tail; + struct pv_chunk *pc; + vm_page_t m; + int avail, free; + bool reclaimed; + + rw_assert(&pvh_global_lock, RA_LOCKED); + PMAP_LOCK_ASSERT(pmap, MA_OWNED); + KASSERT(lockp != NULL, ("reserve_pv_entries: lockp is NULL")); + + /* + * Newly allocated PV chunks must be stored in a private list until + * the required number of PV chunks have been allocated. Otherwise, + * reclaim_pv_chunk() could recycle one of these chunks. In + * contrast, these chunks must be added to the pmap upon allocation. + */ + TAILQ_INIT(&new_tail); +retry: + avail = 0; + TAILQ_FOREACH(pc, &pmap->pm_pvchunk, pc_list) { + bit_count((bitstr_t *)pc->pc_map, 0, + sizeof(pc->pc_map) * NBBY, &free); + if (free == 0) + break; + avail += free; + if (avail >= needed) + break; + } + for (reclaimed = false; avail < needed; avail += _NPCPV) { + m = vm_page_alloc(NULL, 0, VM_ALLOC_NORMAL | VM_ALLOC_NOOBJ | + VM_ALLOC_WIRED); + if (m == NULL) { + m = reclaim_pv_chunk(pmap, lockp); + if (m == NULL) + goto retry; + reclaimed = true; + } + /* XXX PV STATS */ +#if 0 + dump_add_page(m->phys_addr); +#endif + pc = (void *)PHYS_TO_DMAP(m->phys_addr); + pc->pc_pmap = pmap; + pc->pc_map[0] = PC_FREE0; + pc->pc_map[1] = PC_FREE1; + pc->pc_map[2] = PC_FREE2; + TAILQ_INSERT_HEAD(&pmap->pm_pvchunk, pc, pc_list); + TAILQ_INSERT_TAIL(&new_tail, pc, pc_lru); + + /* + * The reclaim might have freed a chunk from the current pmap. + * If that chunk contained available entries, we need to + * re-count the number of available entries. + */ + if (reclaimed) + goto retry; + } + if (!TAILQ_EMPTY(&new_tail)) { + mtx_lock(&pv_chunks_mutex); + TAILQ_CONCAT(&pv_chunks, &new_tail, pc_lru); + mtx_unlock(&pv_chunks_mutex); + } +} + +/* * First find and then remove the pv entry for the specified pmap and virtual * address from the specified pv list. Returns the pv entry if found and NULL * otherwise. This operation can be performed on pv lists for either 4KB or @@ -1632,7 +1820,7 @@ pmap_pvh_free(struct md_page *pvh, pmap_t pmap, vm_off pv = pmap_pvh_remove(pvh, pmap, va); - KASSERT(pv != NULL, ("pmap_pvh_free: pv not found")); + KASSERT(pv != NULL, ("pmap_pvh_free: pv not found for %#lx", va)); free_pv_entry(pmap, pv); } @@ -1660,6 +1848,222 @@ pmap_try_insert_pv_entry(pmap_t pmap, vm_offset_t va, } /* + * After demotion from a 2MB page mapping to 512 4KB page mappings, + * destroy the pv entry for the 2MB page mapping and reinstantiate the pv + * entries for each of the 4KB page mappings. + */ +static void __unused +pmap_pv_demote_l2(pmap_t pmap, vm_offset_t va, vm_paddr_t pa, + struct rwlock **lockp) +{ + struct md_page *pvh; + struct pv_chunk *pc; + pv_entry_t pv; + vm_page_t m; + vm_offset_t va_last; + int bit, field; + + rw_assert(&pvh_global_lock, RA_LOCKED); + PMAP_LOCK_ASSERT(pmap, MA_OWNED); + CHANGE_PV_LIST_LOCK_TO_PHYS(lockp, pa); + + /* + * Transfer the 2mpage's pv entry for this mapping to the first + * page's pv list. Once this transfer begins, the pv list lock + * must not be released until the last pv entry is reinstantiated. + */ + pvh = pa_to_pvh(pa); + va &= ~L2_OFFSET; + pv = pmap_pvh_remove(pvh, pmap, va); + KASSERT(pv != NULL, ("pmap_pv_demote_l2: pv not found")); + m = PHYS_TO_VM_PAGE(pa); + TAILQ_INSERT_TAIL(&m->md.pv_list, pv, pv_next); + m->md.pv_gen++; + /* Instantiate the remaining 511 pv entries. */ + va_last = va + L2_SIZE - PAGE_SIZE; + for (;;) { + pc = TAILQ_FIRST(&pmap->pm_pvchunk); + KASSERT(pc->pc_map[0] != 0 || pc->pc_map[1] != 0 || + pc->pc_map[2] != 0, ("pmap_pv_demote_l2: missing spare")); + for (field = 0; field < _NPCM; field++) { + while (pc->pc_map[field] != 0) { + bit = ffsl(pc->pc_map[field]) - 1; + pc->pc_map[field] &= ~(1ul << bit); + pv = &pc->pc_pventry[field * 64 + bit]; + va += PAGE_SIZE; + pv->pv_va = va; + m++; + KASSERT((m->oflags & VPO_UNMANAGED) == 0, + ("pmap_pv_demote_l2: page %p is not managed", m)); + TAILQ_INSERT_TAIL(&m->md.pv_list, pv, pv_next); + m->md.pv_gen++; + if (va == va_last) + goto out; + } + } + TAILQ_REMOVE(&pmap->pm_pvchunk, pc, pc_list); + TAILQ_INSERT_TAIL(&pmap->pm_pvchunk, pc, pc_list); + } +out: + if (pc->pc_map[0] == 0 && pc->pc_map[1] == 0 && pc->pc_map[2] == 0) { + TAILQ_REMOVE(&pmap->pm_pvchunk, pc, pc_list); + TAILQ_INSERT_TAIL(&pmap->pm_pvchunk, pc, pc_list); + } + /* XXX PV stats */ +} + +#if VM_NRESERVLEVEL > 0 +static void +pmap_pv_promote_l2(pmap_t pmap, vm_offset_t va, vm_paddr_t pa, + struct rwlock **lockp) +{ + struct md_page *pvh; + pv_entry_t pv; + vm_page_t m; + vm_offset_t va_last; + + rw_assert(&pvh_global_lock, RA_LOCKED); + KASSERT((va & L2_OFFSET) == 0, + ("pmap_pv_promote_l2: misaligned va %#lx", va)); + + CHANGE_PV_LIST_LOCK_TO_PHYS(lockp, pa); + + m = PHYS_TO_VM_PAGE(pa); + pv = pmap_pvh_remove(&m->md, pmap, va); + KASSERT(pv != NULL, ("pmap_pv_promote_l2: pv for %#lx not found", va)); + pvh = pa_to_pvh(pa); + TAILQ_INSERT_TAIL(&pvh->pv_list, pv, pv_next); + pvh->pv_gen++; + + va_last = va + L2_SIZE - PAGE_SIZE; + do { + m++; + va += PAGE_SIZE; + pmap_pvh_free(&m->md, pmap, va); + } while (va < va_last); +} +#endif /* VM_NRESERVLEVEL > 0 */ + +/* + * Create the PV entry for a 2MB page mapping. Always returns true unless the + * flag PMAP_ENTER_NORECLAIM is specified. If that flag is specified, returns + * false if the PV entry cannot be allocated without resorting to reclamation. + */ +static bool +pmap_pv_insert_l2(pmap_t pmap, vm_offset_t va, pd_entry_t l2e, u_int flags, + struct rwlock **lockp) +{ + struct md_page *pvh; + pv_entry_t pv; + vm_paddr_t pa; + + PMAP_LOCK_ASSERT(pmap, MA_OWNED); + /* Pass NULL instead of the lock pointer to disable reclamation. */ + if ((pv = get_pv_entry(pmap, (flags & PMAP_ENTER_NORECLAIM) != 0 ? + NULL : lockp)) == NULL) + return (false); + pv->pv_va = va; + pa = PTE_TO_PHYS(l2e); + CHANGE_PV_LIST_LOCK_TO_PHYS(lockp, pa); + pvh = pa_to_pvh(pa); + TAILQ_INSERT_TAIL(&pvh->pv_list, pv, pv_next); + pvh->pv_gen++; + return (true); +} + +static void +pmap_remove_kernel_l2(pmap_t pmap, pt_entry_t *l2, vm_offset_t va) +{ + pt_entry_t newl2, oldl2; + vm_page_t ml3; + vm_paddr_t ml3pa; + + KASSERT(!VIRT_IN_DMAP(va), ("removing direct mapping of %#lx", va)); + KASSERT(pmap == kernel_pmap, ("pmap %p is not kernel_pmap", pmap)); + PMAP_LOCK_ASSERT(pmap, MA_OWNED); + + ml3 = pmap_remove_pt_page(pmap, va); + if (ml3 == NULL) + panic("pmap_remove_kernel_l2: Missing pt page"); + + ml3pa = VM_PAGE_TO_PHYS(ml3); + newl2 = ml3pa | PTE_V; + + /* + * Initialize the page table page. + */ + pagezero((void *)PHYS_TO_DMAP(ml3pa)); + + /* + * Demote the mapping. + */ + oldl2 = pmap_load_store(l2, newl2); + KASSERT(oldl2 == 0, ("%s: found existing mapping at %p: %#lx", + __func__, l2, oldl2)); +} + +/* + * pmap_remove_l2: Do the things to unmap a level 2 superpage. + */ +static int +pmap_remove_l2(pmap_t pmap, pt_entry_t *l2, vm_offset_t sva, + pd_entry_t l1e, struct spglist *free, struct rwlock **lockp) +{ + struct md_page *pvh; + pt_entry_t oldl2; + vm_offset_t eva, va; + vm_page_t m, ml3; + + PMAP_LOCK_ASSERT(pmap, MA_OWNED); + KASSERT((sva & L2_OFFSET) == 0, ("pmap_remove_l2: sva is not aligned")); + oldl2 = pmap_load_clear(l2); + KASSERT((oldl2 & PTE_RWX) != 0, + ("pmap_remove_l2: L2e %lx is not a superpage mapping", oldl2)); + + /* + * The sfence.vma documentation states that it is sufficient to specify + * a single address within a superpage mapping. However, since we do + * not perform any invalidation upon promotion, TLBs may still be + * caching 4KB mappings within the superpage, so we must invalidate the + * entire range. + */ + pmap_invalidate_range(pmap, sva, sva + L2_SIZE); + if ((oldl2 & PTE_SW_WIRED) != 0) + pmap->pm_stats.wired_count -= L2_SIZE / PAGE_SIZE; + pmap_resident_count_dec(pmap, L2_SIZE / PAGE_SIZE); + if ((oldl2 & PTE_SW_MANAGED) != 0) { + CHANGE_PV_LIST_LOCK_TO_PHYS(lockp, PTE_TO_PHYS(oldl2)); + pvh = pa_to_pvh(PTE_TO_PHYS(oldl2)); + pmap_pvh_free(pvh, pmap, sva); + eva = sva + L2_SIZE; + for (va = sva, m = PHYS_TO_VM_PAGE(PTE_TO_PHYS(oldl2)); + va < eva; va += PAGE_SIZE, m++) { + if ((oldl2 & PTE_D) != 0) + vm_page_dirty(m); + if ((oldl2 & PTE_A) != 0) + vm_page_aflag_set(m, PGA_REFERENCED); + if (TAILQ_EMPTY(&m->md.pv_list) && + TAILQ_EMPTY(&pvh->pv_list)) + vm_page_aflag_clear(m, PGA_WRITEABLE); + } + } + if (pmap == kernel_pmap) { + pmap_remove_kernel_l2(pmap, l2, sva); + } else { + ml3 = pmap_remove_pt_page(pmap, sva); + if (ml3 != NULL) { + pmap_resident_count_dec(pmap, 1); + KASSERT(ml3->wire_count == Ln_ENTRIES, + ("pmap_remove_l2: l3 page wire count error")); + ml3->wire_count = 1; + vm_page_unwire_noq(ml3); + pmap_add_delayed_free_list(ml3, free, FALSE); + } + } + return (pmap_unuse_pt(pmap, sva, l1e, free)); +} + +/* * pmap_remove_l3: do the things to unmap a page in a process */ static int @@ -1687,7 +2091,7 @@ pmap_remove_l3(pmap_t pmap, pt_entry_t *l3, vm_offset_ pmap_pvh_free(&m->md, pmap, va); } - return (pmap_unuse_l3(pmap, va, l2e, free)); + return (pmap_unuse_pt(pmap, va, l2e, free)); } /* @@ -1699,11 +2103,11 @@ pmap_remove_l3(pmap_t pmap, pt_entry_t *l3, vm_offset_ void pmap_remove(pmap_t pmap, vm_offset_t sva, vm_offset_t eva) { + struct spglist free; struct rwlock *lock; vm_offset_t va, va_next; - pd_entry_t *l1, *l2; - pt_entry_t l3_pte, *l3; - struct spglist free; + pd_entry_t *l1, *l2, l2e; + pt_entry_t *l3; /* * Perform an unsynchronized read. This is, however, safe. @@ -1739,16 +2143,22 @@ pmap_remove(pmap_t pmap, vm_offset_t sva, vm_offset_t l2 = pmap_l1_to_l2(l1, sva); if (l2 == NULL) continue; - - l3_pte = pmap_load(l2); - - /* - * Weed out invalid mappings. - */ - if (l3_pte == 0) + if ((l2e = pmap_load(l2)) == 0) continue; - if ((pmap_load(l2) & PTE_RX) != 0) - continue; + if ((l2e & PTE_RWX) != 0) { + if (sva + L2_SIZE == va_next && eva >= va_next) { + (void)pmap_remove_l2(pmap, l2, sva, + pmap_load(l1), &free, &lock); + continue; + } else if (!pmap_demote_l2_locked(pmap, l2, sva, + &lock)) { + /* + * The large page mapping was destroyed. + */ + continue; + } + l2e = pmap_load(l2); + } /* * Limit our scan to either the end of the va represented @@ -1761,8 +2171,6 @@ pmap_remove(pmap_t pmap, vm_offset_t sva, vm_offset_t va = va_next; for (l3 = pmap_l2_to_l3(l2, sva); sva != va_next; l3++, sva += L3_SIZE) { - if (l3 == NULL) - panic("l3 == NULL"); if (pmap_load(l3) == 0) { if (va != va_next) { pmap_invalidate_range(pmap, va, sva); @@ -1772,8 +2180,7 @@ pmap_remove(pmap_t pmap, vm_offset_t sva, vm_offset_t } if (va == va_next) va = sva; - if (pmap_remove_l3(pmap, l3, sva, l3_pte, &free, - &lock)) { + if (pmap_remove_l3(pmap, l3, sva, l2e, &free, &lock)) { sva += L3_SIZE; break; } @@ -1783,7 +2190,7 @@ pmap_remove(pmap_t pmap, vm_offset_t sva, vm_offset_t } if (lock != NULL) rw_wunlock(lock); - rw_runlock(&pvh_global_lock); + rw_runlock(&pvh_global_lock); PMAP_UNLOCK(pmap); vm_page_free_pages_toq(&free, false); } @@ -1804,42 +2211,54 @@ pmap_remove(pmap_t pmap, vm_offset_t sva, vm_offset_t void pmap_remove_all(vm_page_t m) { - pv_entry_t pv; - pmap_t pmap; - pt_entry_t *l3, tl3; - pd_entry_t *l2, tl2; struct spglist free; + struct md_page *pvh; + pmap_t pmap; + pt_entry_t *l3, l3e; + pd_entry_t *l2, l2e; + pv_entry_t pv; + vm_offset_t va; KASSERT((m->oflags & VPO_UNMANAGED) == 0, ("pmap_remove_all: page %p is not managed", m)); SLIST_INIT(&free); + pvh = (m->flags & PG_FICTITIOUS) != 0 ? &pv_dummy : + pa_to_pvh(VM_PAGE_TO_PHYS(m)); + rw_wlock(&pvh_global_lock); + while ((pv = TAILQ_FIRST(&pvh->pv_list)) != NULL) { + pmap = PV_PMAP(pv); + PMAP_LOCK(pmap); + va = pv->pv_va; + l2 = pmap_l2(pmap, va); + (void)pmap_demote_l2(pmap, l2, va); + PMAP_UNLOCK(pmap); + } while ((pv = TAILQ_FIRST(&m->md.pv_list)) != NULL) { pmap = PV_PMAP(pv); PMAP_LOCK(pmap); pmap_resident_count_dec(pmap, 1); l2 = pmap_l2(pmap, pv->pv_va); KASSERT(l2 != NULL, ("pmap_remove_all: no l2 table found")); - tl2 = pmap_load(l2); + l2e = pmap_load(l2); - KASSERT((tl2 & PTE_RX) == 0, - ("pmap_remove_all: found a table when expecting " - "a block in %p's pv list", m)); + KASSERT((l2e & PTE_RX) == 0, + ("pmap_remove_all: found a superpage in %p's pv list", m)); l3 = pmap_l2_to_l3(l2, pv->pv_va); - tl3 = pmap_load_clear(l3); + l3e = pmap_load_clear(l3); pmap_invalidate_page(pmap, pv->pv_va); - if (tl3 & PTE_SW_WIRED) + if (l3e & PTE_SW_WIRED) pmap->pm_stats.wired_count--; - if ((tl3 & PTE_A) != 0) + if ((l3e & PTE_A) != 0) vm_page_aflag_set(m, PGA_REFERENCED); /* * Update the vm_page_t clean and reference bits. */ - if ((tl3 & PTE_D) != 0) + if ((l3e & PTE_D) != 0) vm_page_dirty(m); - pmap_unuse_l3(pmap, pv->pv_va, pmap_load(l2), &free); + pmap_unuse_pt(pmap, pv->pv_va, pmap_load(l2), &free); TAILQ_REMOVE(&m->md.pv_list, pv, pv_next); m->md.pv_gen++; free_pv_entry(pmap, pv); @@ -1857,10 +2276,12 @@ pmap_remove_all(vm_page_t m) void pmap_protect(pmap_t pmap, vm_offset_t sva, vm_offset_t eva, vm_prot_t prot) { - pd_entry_t *l1, *l2; + pd_entry_t *l1, *l2, l2e; pt_entry_t *l3, l3e, mask; vm_page_t m; - vm_offset_t va_next; + vm_paddr_t pa; + vm_offset_t va, va_next; + bool anychanged, pv_lists_locked; if ((prot & VM_PROT_READ) == VM_PROT_NONE) { pmap_remove(pmap, sva, eva); @@ -1871,12 +2292,14 @@ pmap_protect(pmap_t pmap, vm_offset_t sva, vm_offset_t (VM_PROT_WRITE | VM_PROT_EXECUTE)) return; + anychanged = false; + pv_lists_locked = false; mask = 0; if ((prot & VM_PROT_WRITE) == 0) mask |= PTE_W | PTE_D; if ((prot & VM_PROT_EXECUTE) == 0) mask |= PTE_X; - +resume: PMAP_LOCK(pmap); for (; sva < eva; sva = va_next) { l1 = pmap_l1(pmap, sva); @@ -1892,10 +2315,41 @@ pmap_protect(pmap_t pmap, vm_offset_t sva, vm_offset_t va_next = eva; l2 = pmap_l1_to_l2(l1, sva); - if (l2 == NULL || pmap_load(l2) == 0) + if (l2 == NULL || (l2e = pmap_load(l2)) == 0) continue; - if ((pmap_load(l2) & PTE_RX) != 0) - continue; + if ((l2e & PTE_RWX) != 0) { + if (sva + L2_SIZE == va_next && eva >= va_next) { +retryl2: + if ((l2e & (PTE_SW_MANAGED | PTE_D)) == + (PTE_SW_MANAGED | PTE_D)) { + pa = PTE_TO_PHYS(l2e); + for (va = sva, m = PHYS_TO_VM_PAGE(pa); + va < va_next; m++, va += PAGE_SIZE) + vm_page_dirty(m); + } + if (!atomic_fcmpset_long(l2, &l2e, l2e & ~mask)) + goto retryl2; + anychanged = true; + } else { + if (!pv_lists_locked) { + pv_lists_locked = true; + if (!rw_try_rlock(&pvh_global_lock)) { + if (anychanged) + pmap_invalidate_all( + pmap); + PMAP_UNLOCK(pmap); + rw_rlock(&pvh_global_lock); + goto resume; + } + } + if (!pmap_demote_l2(pmap, l2, sva)) { + /* + * The large page mapping was destroyed. + */ + continue; + } + } + } if (va_next > eva) va_next = eva; @@ -1903,7 +2357,7 @@ pmap_protect(pmap_t pmap, vm_offset_t sva, vm_offset_t for (l3 = pmap_l2_to_l3(l2, sva); sva != va_next; l3++, sva += L3_SIZE) { l3e = pmap_load(l3); -retry: +retryl3: if ((l3e & PTE_V) == 0) continue; if ((prot & VM_PROT_WRITE) == 0 && @@ -1913,60 +2367,236 @@ retry: vm_page_dirty(m); } if (!atomic_fcmpset_long(l3, &l3e, l3e & ~mask)) - goto retry; - /* XXX: Use pmap_invalidate_range */ - pmap_invalidate_page(pmap, sva); + goto retryl3; + anychanged = true; } } + if (anychanged) + pmap_invalidate_all(pmap); + if (pv_lists_locked) + rw_runlock(&pvh_global_lock); PMAP_UNLOCK(pmap); } int pmap_fault_fixup(pmap_t pmap, vm_offset_t va, vm_prot_t ftype) { - pt_entry_t orig_l3; - pt_entry_t new_l3; - pt_entry_t *l3; + pd_entry_t *l2, l2e; *** DIFF OUTPUT TRUNCATED AT 1000 LINES ***