/* * CDDL HEADER START * * The contents of this file are subject to the terms of the * Common Development and Distribution License (the "License"). * You may not use this file except in compliance with the License. * * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE * or http://www.opensolaris.org/os/licensing. * See the License for the specific language governing permissions * and limitations under the License. * * When distributing Covered Code, include this CDDL HEADER in each * file and include the License file at usr/src/OPENSOLARIS.LICENSE. * If applicable, add the following below this CDDL HEADER, with the * fields enclosed by brackets "[]" replaced with your own identifying * information: Portions Copyright [yyyy] [name of copyright owner] * * CDDL HEADER END */ /* * Copyright 2008 Sun Microsystems, Inc. All rights reserved. * Use is subject to license terms. */ /* Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */ /* All Rights Reserved */ /* * Portions of this source code were derived from Berkeley 4.3 BSD * under license from the Regents of the University of California. */ #pragma ident "%Z%%M% %I% %E% SMI" /* * UNIX machine dependent virtual memory support. */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include /* XXX the memlist stuff belongs in memlist_plat.h */ #include #include #include #include #include #include #include #include #include #include #include #include #include #ifdef __xpv #include #include #include /* * domain 0 pages usable for DMA are kept pre-allocated and kept in * distinct lists, ordered by increasing mfn. */ static kmutex_t io_pool_lock; static kmutex_t contig_list_lock; static page_t *io_pool_4g; /* pool for 32 bit dma limited devices */ static page_t *io_pool_16m; /* pool for 24 bit dma limited legacy devices */ static long io_pool_cnt; static long io_pool_cnt_max = 0; #define DEFAULT_IO_POOL_MIN 128 static long io_pool_cnt_min = DEFAULT_IO_POOL_MIN; static long io_pool_cnt_lowater = 0; static long io_pool_shrink_attempts; /* how many times did we try to shrink */ static long io_pool_shrinks; /* how many times did we really shrink */ static long io_pool_grows; /* how many times did we grow */ static mfn_t start_mfn = 1; static caddr_t io_pool_kva; /* use to alloc pages when needed */ static int create_contig_pfnlist(uint_t); /* * percentage of phys mem to hold in the i/o pool */ #define DEFAULT_IO_POOL_PCT 2 static long io_pool_physmem_pct = DEFAULT_IO_POOL_PCT; static void page_io_pool_sub(page_t **, page_t *, page_t *); int ioalloc_dbg = 0; #endif /* __xpv */ uint_t vac_colors = 1; int largepagesupport = 0; extern uint_t page_create_new; extern uint_t page_create_exists; extern uint_t page_create_putbacks; extern uint_t page_create_putbacks; /* * Allow users to disable the kernel's use of SSE. */ extern int use_sse_pagecopy, use_sse_pagezero; /* * combined memory ranges from mnode and memranges[] to manage single * mnode/mtype dimension in the page lists. */ typedef struct { pfn_t mnr_pfnlo; pfn_t mnr_pfnhi; int mnr_mnode; int mnr_memrange; /* index into memranges[] */ /* maintain page list stats */ pgcnt_t mnr_mt_clpgcnt; /* cache list cnt */ pgcnt_t mnr_mt_flpgcnt[MMU_PAGE_SIZES]; /* free list cnt per szc */ pgcnt_t mnr_mt_totcnt; /* sum of cache and free lists */ #ifdef DEBUG struct mnr_mts { /* mnode/mtype szc stats */ pgcnt_t mnr_mts_pgcnt; int mnr_mts_colors; pgcnt_t *mnr_mtsc_pgcnt; } *mnr_mts; #endif } mnoderange_t; #define MEMRANGEHI(mtype) \ ((mtype > 0) ? memranges[mtype - 1] - 1: physmax) #define MEMRANGELO(mtype) (memranges[mtype]) #define MTYPE_FREEMEM(mt) (mnoderanges[mt].mnr_mt_totcnt) /* * As the PC architecture evolved memory up was clumped into several * ranges for various historical I/O devices to do DMA. * < 16Meg - ISA bus * < 2Gig - ??? * < 4Gig - PCI bus or drivers that don't understand PAE mode * * These are listed in reverse order, so that we can skip over unused * ranges on machines with small memories. * * For now under the Hypervisor, we'll only ever have one memrange. */ #define PFN_4GIG 0x100000 #define PFN_16MEG 0x1000 static pfn_t arch_memranges[NUM_MEM_RANGES] = { PFN_4GIG, /* pfn range for 4G and above */ 0x80000, /* pfn range for 2G-4G */ PFN_16MEG, /* pfn range for 16M-2G */ 0x00000, /* pfn range for 0-16M */ }; pfn_t *memranges = &arch_memranges[0]; int nranges = NUM_MEM_RANGES; /* * This combines mem_node_config and memranges into one data * structure to be used for page list management. */ mnoderange_t *mnoderanges; int mnoderangecnt; int mtype4g; /* * 4g memory management variables for systems with more than 4g of memory: * * physical memory below 4g is required for 32bit dma devices and, currently, * for kmem memory. On systems with more than 4g of memory, the pool of memory * below 4g can be depleted without any paging activity given that there is * likely to be sufficient memory above 4g. * * physmax4g is set true if the largest pfn is over 4g. The rest of the * 4g memory management code is enabled only when physmax4g is true. * * maxmem4g is the count of the maximum number of pages on the page lists * with physical addresses below 4g. It can be a lot less then 4g given that * BIOS may reserve large chunks of space below 4g for hot plug pci devices, * agp aperture etc. * * freemem4g maintains the count of the number of available pages on the * page lists with physical addresses below 4g. * * DESFREE4G specifies the desired amount of below 4g memory. It defaults to * 6% (desfree4gshift = 4) of maxmem4g. * * RESTRICT4G_ALLOC returns true if freemem4g falls below DESFREE4G * and the amount of physical memory above 4g is greater than freemem4g. * In this case, page_get_* routines will restrict below 4g allocations * for requests that don't specifically require it. */ #define LOTSFREE4G (maxmem4g >> lotsfree4gshift) #define DESFREE4G (maxmem4g >> desfree4gshift) #define RESTRICT4G_ALLOC \ (physmax4g && (freemem4g < DESFREE4G) && ((freemem4g << 1) < freemem)) static pgcnt_t maxmem4g; static pgcnt_t freemem4g; static int physmax4g; static int desfree4gshift = 4; /* maxmem4g shift to derive DESFREE4G */ static int lotsfree4gshift = 3; /* * 16m memory management: * * reserve some amount of physical memory below 16m for legacy devices. * * RESTRICT16M_ALLOC returns true if an there are sufficient free pages above * 16m or if the 16m pool drops below DESFREE16M. * * In this case, general page allocations via page_get_{free,cache}list * routines will be restricted from allocating from the 16m pool. Allocations * that require specific pfn ranges (page_get_anylist) and PG_PANIC allocations * are not restricted. */ #define FREEMEM16M MTYPE_FREEMEM(0) #define DESFREE16M desfree16m #define RESTRICT16M_ALLOC(freemem, pgcnt, flags) \ ((freemem != 0) && ((flags & PG_PANIC) == 0) && \ ((freemem >= (FREEMEM16M)) || \ (FREEMEM16M < (DESFREE16M + pgcnt)))) static pgcnt_t desfree16m = 0x380; /* * This can be patched via /etc/system to allow old non-PAE aware device * drivers to use kmem_alloc'd memory on 32 bit systems with > 4Gig RAM. */ int restricted_kmemalloc = 0; #ifdef VM_STATS struct { ulong_t pga_alloc; ulong_t pga_notfullrange; ulong_t pga_nulldmaattr; ulong_t pga_allocok; ulong_t pga_allocfailed; ulong_t pgma_alloc; ulong_t pgma_allocok; ulong_t pgma_allocfailed; ulong_t pgma_allocempty; } pga_vmstats; #endif uint_t mmu_page_sizes; /* How many page sizes the users can see */ uint_t mmu_exported_page_sizes; /* page sizes that legacy applications can see */ uint_t mmu_legacy_page_sizes; /* * Number of pages in 1 GB. Don't enable automatic large pages if we have * fewer than this many pages. */ pgcnt_t shm_lpg_min_physmem = 1 << (30 - MMU_PAGESHIFT); pgcnt_t privm_lpg_min_physmem = 1 << (30 - MMU_PAGESHIFT); /* * Maximum and default segment size tunables for user private * and shared anon memory, and user text and initialized data. * These can be patched via /etc/system to allow large pages * to be used for mapping application private and shared anon memory. */ size_t mcntl0_lpsize = MMU_PAGESIZE; size_t max_uheap_lpsize = MMU_PAGESIZE; size_t default_uheap_lpsize = MMU_PAGESIZE; size_t max_ustack_lpsize = MMU_PAGESIZE; size_t default_ustack_lpsize = MMU_PAGESIZE; size_t max_privmap_lpsize = MMU_PAGESIZE; size_t max_uidata_lpsize = MMU_PAGESIZE; size_t max_utext_lpsize = MMU_PAGESIZE; size_t max_shm_lpsize = MMU_PAGESIZE; /* * initialized by page_coloring_init(). */ uint_t page_colors; uint_t page_colors_mask; uint_t page_coloring_shift; int cpu_page_colors; static uint_t l2_colors; /* * Page freelists and cachelists are dynamically allocated once mnoderangecnt * and page_colors are calculated from the l2 cache n-way set size. Within a * mnode range, the page freelist and cachelist are hashed into bins based on * color. This makes it easier to search for a page within a specific memory * range. */ #define PAGE_COLORS_MIN 16 page_t ****page_freelists; page_t ***page_cachelists; /* * Used by page layer to know about page sizes */ hw_pagesize_t hw_page_array[MAX_NUM_LEVEL + 1]; kmutex_t *fpc_mutex[NPC_MUTEX]; kmutex_t *cpc_mutex[NPC_MUTEX]; /* * Only let one thread at a time try to coalesce large pages, to * prevent them from working against each other. */ static kmutex_t contig_lock; #define CONTIG_LOCK() mutex_enter(&contig_lock); #define CONTIG_UNLOCK() mutex_exit(&contig_lock); #define PFN_16M (mmu_btop((uint64_t)0x1000000)) /* * Return the optimum page size for a given mapping */ /*ARGSUSED*/ size_t map_pgsz(int maptype, struct proc *p, caddr_t addr, size_t len, int memcntl) { level_t l = 0; size_t pgsz = MMU_PAGESIZE; size_t max_lpsize; uint_t mszc; ASSERT(maptype != MAPPGSZ_VA); if (maptype != MAPPGSZ_ISM && physmem < privm_lpg_min_physmem) { return (MMU_PAGESIZE); } switch (maptype) { case MAPPGSZ_HEAP: case MAPPGSZ_STK: max_lpsize = memcntl ? mcntl0_lpsize : (maptype == MAPPGSZ_HEAP ? max_uheap_lpsize : max_ustack_lpsize); if (max_lpsize == MMU_PAGESIZE) { return (MMU_PAGESIZE); } if (len == 0) { len = (maptype == MAPPGSZ_HEAP) ? p->p_brkbase + p->p_brksize - p->p_bssbase : p->p_stksize; } len = (maptype == MAPPGSZ_HEAP) ? MAX(len, default_uheap_lpsize) : MAX(len, default_ustack_lpsize); /* * use the pages size that best fits len */ for (l = mmu.umax_page_level; l > 0; --l) { if (LEVEL_SIZE(l) > max_lpsize || len < LEVEL_SIZE(l)) { continue; } else { pgsz = LEVEL_SIZE(l); } break; } mszc = (maptype == MAPPGSZ_HEAP ? p->p_brkpageszc : p->p_stkpageszc); if (addr == 0 && (pgsz < hw_page_array[mszc].hp_size)) { pgsz = hw_page_array[mszc].hp_size; } return (pgsz); case MAPPGSZ_ISM: for (l = mmu.umax_page_level; l > 0; --l) { if (len >= LEVEL_SIZE(l)) return (LEVEL_SIZE(l)); } return (LEVEL_SIZE(0)); } return (pgsz); } static uint_t map_szcvec(caddr_t addr, size_t size, uintptr_t off, size_t max_lpsize, size_t min_physmem) { caddr_t eaddr = addr + size; uint_t szcvec = 0; caddr_t raddr; caddr_t readdr; size_t pgsz; int i; if (physmem < min_physmem || max_lpsize <= MMU_PAGESIZE) { return (0); } for (i = mmu_exported_page_sizes - 1; i > 0; i--) { pgsz = page_get_pagesize(i); if (pgsz > max_lpsize) { continue; } raddr = (caddr_t)P2ROUNDUP((uintptr_t)addr, pgsz); readdr = (caddr_t)P2ALIGN((uintptr_t)eaddr, pgsz); if (raddr < addr || raddr >= readdr) { continue; } if (P2PHASE((uintptr_t)addr ^ off, pgsz)) { continue; } /* * Set szcvec to the remaining page sizes. */ szcvec = ((1 << (i + 1)) - 1) & ~1; break; } return (szcvec); } /* * Return a bit vector of large page size codes that * can be used to map [addr, addr + len) region. */ /*ARGSUSED*/ uint_t map_pgszcvec(caddr_t addr, size_t size, uintptr_t off, int flags, int type, int memcntl) { size_t max_lpsize = mcntl0_lpsize; if (mmu.max_page_level == 0) return (0); if (flags & MAP_TEXT) { if (!memcntl) max_lpsize = max_utext_lpsize; return (map_szcvec(addr, size, off, max_lpsize, shm_lpg_min_physmem)); } else if (flags & MAP_INITDATA) { if (!memcntl) max_lpsize = max_uidata_lpsize; return (map_szcvec(addr, size, off, max_lpsize, privm_lpg_min_physmem)); } else if (type == MAPPGSZC_SHM) { if (!memcntl) max_lpsize = max_shm_lpsize; return (map_szcvec(addr, size, off, max_lpsize, shm_lpg_min_physmem)); } else if (type == MAPPGSZC_HEAP) { if (!memcntl) max_lpsize = max_uheap_lpsize; return (map_szcvec(addr, size, off, max_lpsize, privm_lpg_min_physmem)); } else if (type == MAPPGSZC_STACK) { if (!memcntl) max_lpsize = max_ustack_lpsize; return (map_szcvec(addr, size, off, max_lpsize, privm_lpg_min_physmem)); } else { if (!memcntl) max_lpsize = max_privmap_lpsize; return (map_szcvec(addr, size, off, max_lpsize, privm_lpg_min_physmem)); } } /* * Handle a pagefault. */ faultcode_t pagefault( caddr_t addr, enum fault_type type, enum seg_rw rw, int iskernel) { struct as *as; struct hat *hat; struct proc *p; kthread_t *t; faultcode_t res; caddr_t base; size_t len; int err; int mapped_red; uintptr_t ea; ASSERT_STACK_ALIGNED(); if (INVALID_VADDR(addr)) return (FC_NOMAP); mapped_red = segkp_map_red(); if (iskernel) { as = &kas; hat = as->a_hat; } else { t = curthread; p = ttoproc(t); as = p->p_as; hat = as->a_hat; } /* * Dispatch pagefault. */ res = as_fault(hat, as, addr, 1, type, rw); /* * If this isn't a potential unmapped hole in the user's * UNIX data or stack segments, just return status info. */ if (res != FC_NOMAP || iskernel) goto out; /* * Check to see if we happened to faulted on a currently unmapped * part of the UNIX data or stack segments. If so, create a zfod * mapping there and then try calling the fault routine again. */ base = p->p_brkbase; len = p->p_brksize; if (addr < base || addr >= base + len) { /* data seg? */ base = (caddr_t)p->p_usrstack - p->p_stksize; len = p->p_stksize; if (addr < base || addr >= p->p_usrstack) { /* stack seg? */ /* not in either UNIX data or stack segments */ res = FC_NOMAP; goto out; } } /* * the rest of this function implements a 3.X 4.X 5.X compatibility * This code is probably not needed anymore */ if (p->p_model == DATAMODEL_ILP32) { /* expand the gap to the page boundaries on each side */ ea = P2ROUNDUP((uintptr_t)base + len, MMU_PAGESIZE); base = (caddr_t)P2ALIGN((uintptr_t)base, MMU_PAGESIZE); len = ea - (uintptr_t)base; as_rangelock(as); if (as_gap(as, MMU_PAGESIZE, &base, &len, AH_CONTAIN, addr) == 0) { err = as_map(as, base, len, segvn_create, zfod_argsp); as_rangeunlock(as); if (err) { res = FC_MAKE_ERR(err); goto out; } } else { /* * This page is already mapped by another thread after * we returned from as_fault() above. We just fall * through as_fault() below. */ as_rangeunlock(as); } res = as_fault(hat, as, addr, 1, F_INVAL, rw); } out: if (mapped_red) segkp_unmap_red(); return (res); } void map_addr(caddr_t *addrp, size_t len, offset_t off, int vacalign, uint_t flags) { struct proc *p = curproc; caddr_t userlimit = (flags & _MAP_LOW32) ? (caddr_t)_userlimit32 : p->p_as->a_userlimit; map_addr_proc(addrp, len, off, vacalign, userlimit, curproc, flags); } /*ARGSUSED*/ int map_addr_vacalign_check(caddr_t addr, u_offset_t off) { return (0); } /* * map_addr_proc() is the routine called when the system is to * choose an address for the user. We will pick an address * range which is the highest available below userlimit. * * Every mapping will have a redzone of a single page on either side of * the request. This is done to leave one page unmapped between segments. * This is not required, but it's useful for the user because if their * program strays across a segment boundary, it will catch a fault * immediately making debugging a little easier. Currently the redzone * is mandatory. * * addrp is a value/result parameter. * On input it is a hint from the user to be used in a completely * machine dependent fashion. We decide to completely ignore this hint. * If MAP_ALIGN was specified, addrp contains the minimal alignment, which * must be some "power of two" multiple of pagesize. * * On output it is NULL if no address can be found in the current * processes address space or else an address that is currently * not mapped for len bytes with a page of red zone on either side. * * vacalign is not needed on x86 (it's for viturally addressed caches) */ /*ARGSUSED*/ void map_addr_proc( caddr_t *addrp, size_t len, offset_t off, int vacalign, caddr_t userlimit, struct proc *p, uint_t flags) { struct as *as = p->p_as; caddr_t addr; caddr_t base; size_t slen; size_t align_amount; ASSERT32(userlimit == as->a_userlimit); base = p->p_brkbase; #if defined(__amd64) /* * XX64 Yes, this needs more work. */ if (p->p_model == DATAMODEL_NATIVE) { if (userlimit < as->a_userlimit) { /* * This happens when a program wants to map * something in a range that's accessible to a * program in a smaller address space. For example, * a 64-bit program calling mmap32(2) to guarantee * that the returned address is below 4Gbytes. */ ASSERT((uintptr_t)userlimit < ADDRESS_C(0xffffffff)); if (userlimit > base) slen = userlimit - base; else { *addrp = NULL; return; } } else { /* * XX64 This layout is probably wrong .. but in * the event we make the amd64 address space look * like sparcv9 i.e. with the stack -above- the * heap, this bit of code might even be correct. */ slen = p->p_usrstack - base - (((size_t)rctl_enforced_value( rctlproc_legacy[RLIMIT_STACK], p->p_rctls, p) + PAGEOFFSET) & PAGEMASK); } } else #endif slen = userlimit - base; /* Make len be a multiple of PAGESIZE */ len = (len + PAGEOFFSET) & PAGEMASK; /* * figure out what the alignment should be * * XX64 -- is there an ELF_AMD64_MAXPGSZ or is it the same???? */ if (len <= ELF_386_MAXPGSZ) { /* * Align virtual addresses to ensure that ELF shared libraries * are mapped with the appropriate alignment constraints by * the run-time linker. */ align_amount = ELF_386_MAXPGSZ; } else { int l = mmu.umax_page_level; while (l && len < LEVEL_SIZE(l)) --l; align_amount = LEVEL_SIZE(l); } if ((flags & MAP_ALIGN) && ((uintptr_t)*addrp > align_amount)) align_amount = (uintptr_t)*addrp; ASSERT(ISP2(align_amount)); ASSERT(align_amount == 0 || align_amount >= PAGESIZE); off = off & (align_amount - 1); /* * Look for a large enough hole starting below userlimit. * After finding it, use the upper part. */ if (as_gap_aligned(as, len, &base, &slen, AH_HI, NULL, align_amount, PAGESIZE, off) == 0) { caddr_t as_addr; /* * addr is the highest possible address to use since we have * a PAGESIZE redzone at the beginning and end. */ addr = base + slen - (PAGESIZE + len); as_addr = addr; /* * Round address DOWN to the alignment amount and * add the offset in. * If addr is greater than as_addr, len would not be large * enough to include the redzone, so we must adjust down * by the alignment amount. */ addr = (caddr_t)((uintptr_t)addr & (~(align_amount - 1))); addr += (uintptr_t)off; if (addr > as_addr) { addr -= align_amount; } ASSERT(addr > base); ASSERT(addr + len < base + slen); ASSERT(((uintptr_t)addr & (align_amount - 1)) == ((uintptr_t)(off))); *addrp = addr; } else { *addrp = NULL; /* no more virtual space */ } } int valid_va_range_aligned_wraparound; /* * Determine whether [*basep, *basep + *lenp) contains a mappable range of * addresses at least "minlen" long, where the base of the range is at "off" * phase from an "align" boundary and there is space for a "redzone"-sized * redzone on either side of the range. On success, 1 is returned and *basep * and *lenp are adjusted to describe the acceptable range (including * the redzone). On failure, 0 is returned. */ /*ARGSUSED3*/ int valid_va_range_aligned(caddr_t *basep, size_t *lenp, size_t minlen, int dir, size_t align, size_t redzone, size_t off) { uintptr_t hi, lo; size_t tot_len; ASSERT(align == 0 ? off == 0 : off < align); ASSERT(ISP2(align)); ASSERT(align == 0 || align >= PAGESIZE); lo = (uintptr_t)*basep; hi = lo + *lenp; tot_len = minlen + 2 * redzone; /* need at least this much space */ /* * If hi rolled over the top, try cutting back. */ if (hi < lo) { *lenp = 0UL - lo - 1UL; /* See if this really happens. If so, then we figure out why */ valid_va_range_aligned_wraparound++; hi = lo + *lenp; } if (*lenp < tot_len) { return (0); } #if defined(__amd64) /* * Deal with a possible hole in the address range between * hole_start and hole_end that should never be mapped. */ if (lo < hole_start) { if (hi > hole_start) { if (hi < hole_end) { hi = hole_start; } else { /* lo < hole_start && hi >= hole_end */ if (dir == AH_LO) { /* * prefer lowest range */ if (hole_start - lo >= tot_len) hi = hole_start; else if (hi - hole_end >= tot_len) lo = hole_end; else return (0); } else { /* * prefer highest range */ if (hi - hole_end >= tot_len) lo = hole_end; else if (hole_start - lo >= tot_len) hi = hole_start; else return (0); } } } } else { /* lo >= hole_start */ if (hi < hole_end) return (0); if (lo < hole_end) lo = hole_end; } #endif if (hi - lo < tot_len) return (0); if (align > 1) { uintptr_t tlo = lo + redzone; uintptr_t thi = hi - redzone; tlo = (uintptr_t)P2PHASEUP(tlo, align, off); if (tlo < lo + redzone) { return (0); } if (thi < tlo || thi - tlo < minlen) { return (0); } } *basep = (caddr_t)lo; *lenp = hi - lo; return (1); } /* * Determine whether [*basep, *basep + *lenp) contains a mappable range of * addresses at least "minlen" long. On success, 1 is returned and *basep * and *lenp are adjusted to describe the acceptable range. On failure, 0 * is returned. */ int valid_va_range(caddr_t *basep, size_t *lenp, size_t minlen, int dir) { return (valid_va_range_aligned(basep, lenp, minlen, dir, 0, 0, 0)); } /* * Determine whether [addr, addr+len] are valid user addresses. */ /*ARGSUSED*/ int valid_usr_range(caddr_t addr, size_t len, uint_t prot, struct as *as, caddr_t userlimit) { caddr_t eaddr = addr + len; if (eaddr <= addr || addr >= userlimit || eaddr > userlimit) return (RANGE_BADADDR); #if defined(__amd64) /* * Check for the VA hole */ if (eaddr > (caddr_t)hole_start && addr < (caddr_t)hole_end) return (RANGE_BADADDR); #endif return (RANGE_OKAY); } /* * Return 1 if the page frame is onboard memory, else 0. */ int pf_is_memory(pfn_t pf) { if (pfn_is_foreign(pf)) return (0); return (address_in_memlist(phys_install, pfn_to_pa(pf), 1)); } /* * return the memrange containing pfn */ int memrange_num(pfn_t pfn) { int n; for (n = 0; n < nranges - 1; ++n) { if (pfn >= memranges[n]) break; } return (n); } /* * return the mnoderange containing pfn */ /*ARGSUSED*/ int pfn_2_mtype(pfn_t pfn) { #if defined(__xpv) return (0); #else int n; for (n = mnoderangecnt - 1; n >= 0; n--) { if (pfn >= mnoderanges[n].mnr_pfnlo) { break; } } return (n); #endif } #if !defined(__xpv) /* * is_contigpage_free: * returns a page list of contiguous pages. It minimally has to return * minctg pages. Caller determines minctg based on the scatter-gather * list length. * * pfnp is set to the next page frame to search on return. */ static page_t * is_contigpage_free( pfn_t *pfnp, pgcnt_t *pgcnt, pgcnt_t minctg, uint64_t pfnseg, int iolock) { int i = 0; pfn_t pfn = *pfnp; page_t *pp; page_t *plist = NULL; /* * fail if pfn + minctg crosses a segment boundary. * Adjust for next starting pfn to begin at segment boundary. */ if (((*pfnp + minctg - 1) & pfnseg) < (*pfnp & pfnseg)) { *pfnp = roundup(*pfnp, pfnseg + 1); return (NULL); } do { retry: pp = page_numtopp_nolock(pfn + i); if ((pp == NULL) || (page_trylock(pp, SE_EXCL) == 0)) { (*pfnp)++; break; } if (page_pptonum(pp) != pfn + i) { page_unlock(pp); goto retry; } if (!(PP_ISFREE(pp))) { page_unlock(pp); (*pfnp)++; break; } if (!PP_ISAGED(pp)) { page_list_sub(pp, PG_CACHE_LIST); page_hashout(pp, (kmutex_t *)NULL); } else { page_list_sub(pp, PG_FREE_LIST); } if (iolock) page_io_lock(pp); page_list_concat(&plist, &pp); /* * exit loop when pgcnt satisfied or segment boundary reached. */ } while ((++i < *pgcnt) && ((pfn + i) & pfnseg)); *pfnp += i; /* set to next pfn to search */ if (i >= minctg) { *pgcnt -= i; return (plist); } /* * failure: minctg not satisfied. * * if next request crosses segment boundary, set next pfn * to search from the segment boundary. */ if (((*pfnp + minctg - 1) & pfnseg) < (*pfnp & pfnseg)) *pfnp = roundup(*pfnp, pfnseg + 1); /* clean up any pages already allocated */ while (plist) { pp = plist; page_sub(&plist, pp); page_list_add(pp, PG_FREE_LIST | PG_LIST_TAIL); if (iolock) page_io_unlock(pp); page_unlock(pp); } return (NULL); } #endif /* !__xpv */ /* * verify that pages being returned from allocator have correct DMA attribute */ #ifndef DEBUG #define check_dma(a, b, c) (0) #else static void check_dma(ddi_dma_attr_t *dma_attr, page_t *pp, int cnt) { if (dma_attr == NULL) return; while (cnt-- > 0) { if (pa_to_ma(pfn_to_pa(pp->p_pagenum)) < dma_attr->dma_attr_addr_lo) panic("PFN (pp=%p) below dma_attr_addr_lo", pp); if (pa_to_ma(pfn_to_pa(pp->p_pagenum)) >= dma_attr->dma_attr_addr_hi) panic("PFN (pp=%p) above dma_attr_addr_hi", pp); pp = pp->p_next; } } #endif #if !defined(__xpv) static page_t * page_get_contigpage(pgcnt_t *pgcnt, ddi_dma_attr_t *mattr, int iolock) { pfn_t pfn; int sgllen; uint64_t pfnseg; pgcnt_t minctg; page_t *pplist = NULL, *plist; uint64_t lo, hi; pgcnt_t pfnalign = 0; static pfn_t startpfn; static pgcnt_t lastctgcnt; uintptr_t align; CONTIG_LOCK(); if (mattr) { lo = mmu_btop((mattr->dma_attr_addr_lo + MMU_PAGEOFFSET)); hi = mmu_btop(mattr->dma_attr_addr_hi); if (hi >= physmax) hi = physmax - 1; sgllen = mattr->dma_attr_sgllen; pfnseg = mmu_btop(mattr->dma_attr_seg); align = maxbit(mattr->dma_attr_align, mattr->dma_attr_minxfer); if (align > MMU_PAGESIZE) pfnalign = mmu_btop(align); /* * in order to satisfy the request, must minimally * acquire minctg contiguous pages */ minctg = howmany(*pgcnt, sgllen); ASSERT(hi >= lo); /* * start from where last searched if the minctg >= lastctgcnt */ if (minctg < lastctgcnt || startpfn < lo || startpfn > hi) startpfn = lo; } else { hi = physmax - 1; lo = 0; sgllen = 1; pfnseg = mmu.highest_pfn; minctg = *pgcnt; if (minctg < lastctgcnt) startpfn = lo; } lastctgcnt = minctg; ASSERT(pfnseg + 1 >= (uint64_t)minctg); /* conserve 16m memory - start search above 16m when possible */ if (hi > PFN_16M && startpfn < PFN_16M) startpfn = PFN_16M; pfn = startpfn; if (pfnalign) pfn = P2ROUNDUP(pfn, pfnalign); while (pfn + minctg - 1 <= hi) { plist = is_contigpage_free(&pfn, pgcnt, minctg, pfnseg, iolock); if (plist) { page_list_concat(&pplist, &plist); sgllen--; /* * return when contig pages no longer needed */ if (!*pgcnt || ((*pgcnt <= sgllen) && !pfnalign)) { startpfn = pfn; CONTIG_UNLOCK(); check_dma(mattr, pplist, *pgcnt); return (pplist); } minctg = howmany(*pgcnt, sgllen); } if (pfnalign) pfn = P2ROUNDUP(pfn, pfnalign); } /* cannot find contig pages in specified range */ if (startpfn == lo) { CONTIG_UNLOCK(); return (NULL); } /* did not start with lo previously */ pfn = lo; if (pfnalign) pfn = P2ROUNDUP(pfn, pfnalign); /* allow search to go above startpfn */ while (pfn < startpfn) { plist = is_contigpage_free(&pfn, pgcnt, minctg, pfnseg, iolock); if (plist != NULL) { page_list_concat(&pplist, &plist); sgllen--; /* * return when contig pages no longer needed */ if (!*pgcnt || ((*pgcnt <= sgllen) && !pfnalign)) { startpfn = pfn; CONTIG_UNLOCK(); check_dma(mattr, pplist, *pgcnt); return (pplist); } minctg = howmany(*pgcnt, sgllen); } if (pfnalign) pfn = P2ROUNDUP(pfn, pfnalign); } CONTIG_UNLOCK(); return (NULL); } #endif /* !__xpv */ /* * mnode_range_cnt() calculates the number of memory ranges for mnode and * memranges[]. Used to determine the size of page lists and mnoderanges. */ int mnode_range_cnt(int mnode) { #if defined(__xpv) ASSERT(mnode == 0); return (1); #else /* __xpv */ int mri; int mnrcnt = 0; if (mem_node_config[mnode].exists != 0) { mri = nranges - 1; /* find the memranges index below contained in mnode range */ while (MEMRANGEHI(mri) < mem_node_config[mnode].physbase) mri--; /* * increment mnode range counter when memranges or mnode * boundary is reached. */ while (mri >= 0 && mem_node_config[mnode].physmax >= MEMRANGELO(mri)) { mnrcnt++; if (mem_node_config[mnode].physmax > MEMRANGEHI(mri)) mri--; else break; } } ASSERT(mnrcnt <= MAX_MNODE_MRANGES); return (mnrcnt); #endif /* __xpv */ } /* * mnode_range_setup() initializes mnoderanges. */ void mnode_range_setup(mnoderange_t *mnoderanges) { int mnode, mri; for (mnode = 0; mnode < max_mem_nodes; mnode++) { if (mem_node_config[mnode].exists == 0) continue; mri = nranges - 1; while (MEMRANGEHI(mri) < mem_node_config[mnode].physbase) mri--; while (mri >= 0 && mem_node_config[mnode].physmax >= MEMRANGELO(mri)) { mnoderanges->mnr_pfnlo = MAX(MEMRANGELO(mri), mem_node_config[mnode].physbase); mnoderanges->mnr_pfnhi = MIN(MEMRANGEHI(mri), mem_node_config[mnode].physmax); mnoderanges->mnr_mnode = mnode; mnoderanges->mnr_memrange = mri; mnoderanges++; if (mem_node_config[mnode].physmax > MEMRANGEHI(mri)) mri--; else break; } } } /*ARGSUSED*/ int mtype_init(vnode_t *vp, caddr_t vaddr, uint_t *flags, size_t pgsz) { int mtype = mnoderangecnt - 1; #if !defined(__xpv) #if defined(__i386) /* * set the mtype range * - kmem requests needs to be below 4g if restricted_kmemalloc is set. * - for non kmem requests, set range to above 4g if memory below 4g * runs low. */ if (restricted_kmemalloc && VN_ISKAS(vp) && (caddr_t)(vaddr) >= kernelheap && (caddr_t)(vaddr) < ekernelheap) { ASSERT(physmax4g); mtype = mtype4g; if (RESTRICT16M_ALLOC(freemem4g - btop(pgsz), btop(pgsz), *flags)) { *flags |= PGI_MT_RANGE16M; } else { VM_STAT_ADD(vmm_vmstats.unrestrict16mcnt); VM_STAT_COND_ADD((*flags & PG_PANIC), vmm_vmstats.pgpanicalloc); *flags |= PGI_MT_RANGE0; } return (mtype); } #endif /* __i386 */ if (RESTRICT4G_ALLOC) { VM_STAT_ADD(vmm_vmstats.restrict4gcnt); /* here only for > 4g systems */ *flags |= PGI_MT_RANGE4G; } else if (RESTRICT16M_ALLOC(freemem, btop(pgsz), *flags)) { *flags |= PGI_MT_RANGE16M; } else { VM_STAT_ADD(vmm_vmstats.unrestrict16mcnt); VM_STAT_COND_ADD((*flags & PG_PANIC), vmm_vmstats.pgpanicalloc); *flags |= PGI_MT_RANGE0; } #endif /* !__xpv */ return (mtype); } /* mtype init for page_get_replacement_page */ /*ARGSUSED*/ int mtype_pgr_init(int *flags, page_t *pp, int mnode, pgcnt_t pgcnt) { int mtype = mnoderangecnt - 1; #if !defined(__ixpv) if (RESTRICT16M_ALLOC(freemem, pgcnt, *flags)) { *flags |= PGI_MT_RANGE16M; } else { VM_STAT_ADD(vmm_vmstats.unrestrict16mcnt); *flags |= PGI_MT_RANGE0; } #endif return (mtype); } /* * Determine if the mnode range specified in mtype contains memory belonging * to memory node mnode. If flags & PGI_MT_RANGE is set then mtype contains * the range of indices from high pfn to 0, 16m or 4g. * * Return first mnode range type index found otherwise return -1 if none found. */ int mtype_func(int mnode, int mtype, uint_t flags) { if (flags & PGI_MT_RANGE) { int mtlim = 0; if (flags & PGI_MT_NEXT) mtype--; if (flags & PGI_MT_RANGE4G) mtlim = mtype4g + 1; /* exclude 0-4g range */ else if (flags & PGI_MT_RANGE16M) mtlim = 1; /* exclude 0-16m range */ while (mtype >= mtlim) { if (mnoderanges[mtype].mnr_mnode == mnode) return (mtype); mtype--; } } else if (mnoderanges[mtype].mnr_mnode == mnode) { return (mtype); } return (-1); } /* * Update the page list max counts with the pfn range specified by the * input parameters. Called from add_physmem() when physical memory with * page_t's are initially added to the page lists. */ void mtype_modify_max(pfn_t startpfn, long cnt) { int mtype = 0; pfn_t endpfn = startpfn + cnt, pfn; pgcnt_t inc; ASSERT(cnt > 0); if (!physmax4g) return; for (pfn = startpfn; pfn < endpfn; ) { if (pfn <= mnoderanges[mtype].mnr_pfnhi) { if (endpfn < mnoderanges[mtype].mnr_pfnhi) { inc = endpfn - pfn; } else { inc = mnoderanges[mtype].mnr_pfnhi - pfn + 1; } if (mtype <= mtype4g) maxmem4g += inc; pfn += inc; } mtype++; ASSERT(mtype < mnoderangecnt || pfn >= endpfn); } } int mtype_2_mrange(int mtype) { return (mnoderanges[mtype].mnr_memrange); } void mnodetype_2_pfn(int mnode, int mtype, pfn_t *pfnlo, pfn_t *pfnhi) { ASSERT(mnoderanges[mtype].mnr_mnode == mnode); *pfnlo = mnoderanges[mtype].mnr_pfnlo; *pfnhi = mnoderanges[mtype].mnr_pfnhi; } size_t plcnt_sz(size_t ctrs_sz) { #ifdef DEBUG int szc, colors; ctrs_sz += mnoderangecnt * sizeof (struct mnr_mts) * mmu_page_sizes; for (szc = 0; szc < mmu_page_sizes; szc++) { colors = page_get_pagecolors(szc); ctrs_sz += mnoderangecnt * sizeof (pgcnt_t) * colors; } #endif return (ctrs_sz); } caddr_t plcnt_init(caddr_t addr) { #ifdef DEBUG int mt, szc, colors; for (mt = 0; mt < mnoderangecnt; mt++) { mnoderanges[mt].mnr_mts = (struct mnr_mts *)addr; addr += (sizeof (struct mnr_mts) * mmu_page_sizes); for (szc = 0; szc < mmu_page_sizes; szc++) { colors = page_get_pagecolors(szc); mnoderanges[mt].mnr_mts[szc].mnr_mts_colors = colors; mnoderanges[mt].mnr_mts[szc].mnr_mtsc_pgcnt = (pgcnt_t *)addr; addr += (sizeof (pgcnt_t) * colors); } } #endif return (addr); } void plcnt_inc_dec(page_t *pp, int mtype, int szc, long cnt, int flags) { #ifdef DEBUG int bin = PP_2_BIN(pp); atomic_add_long(&mnoderanges[mtype].mnr_mts[szc].mnr_mts_pgcnt, cnt); atomic_add_long(&mnoderanges[mtype].mnr_mts[szc].mnr_mtsc_pgcnt[bin], cnt); #endif ASSERT(mtype == PP_2_MTYPE(pp)); if (physmax4g && mtype <= mtype4g) atomic_add_long(&freemem4g, cnt); if (flags & PG_CACHE_LIST) atomic_add_long(&mnoderanges[mtype].mnr_mt_clpgcnt, cnt); else atomic_add_long(&mnoderanges[mtype].mnr_mt_flpgcnt[szc], cnt); atomic_add_long(&mnoderanges[mtype].mnr_mt_totcnt, cnt); } /* * Returns the free page count for mnode */ int mnode_pgcnt(int mnode) { int mtype = mnoderangecnt - 1; int flags = PGI_MT_RANGE0; pgcnt_t pgcnt = 0; mtype = mtype_func(mnode, mtype, flags); while (mtype != -1) { pgcnt += MTYPE_FREEMEM(mtype); mtype = mtype_func(mnode, mtype, flags | PGI_MT_NEXT); } return (pgcnt); } /* * Initialize page coloring variables based on the l2 cache parameters. * Calculate and return memory needed for page coloring data structures. */ size_t page_coloring_init(uint_t l2_sz, int l2_linesz, int l2_assoc) { size_t colorsz = 0; int i; int colors; #if defined(__xpv) /* * Hypervisor domains currently don't have any concept of NUMA. * Hence we'll act like there is only 1 memrange. */ i = memrange_num(1); #else /* !__xpv */ /* * Reduce the memory ranges lists if we don't have large amounts * of memory. This avoids searching known empty free lists. */ i = memrange_num(physmax); #if defined(__i386) if (i > 0) restricted_kmemalloc = 0; #endif /* physmax greater than 4g */ if (i == 0) physmax4g = 1; #endif /* !__xpv */ memranges += i; nranges -= i; ASSERT(mmu_page_sizes <= MMU_PAGE_SIZES); ASSERT(ISP2(l2_sz)); ASSERT(ISP2(l2_linesz)); ASSERT(l2_sz > MMU_PAGESIZE); /* l2_assoc is 0 for fully associative l2 cache */ if (l2_assoc) l2_colors = MAX(1, l2_sz / (l2_assoc * MMU_PAGESIZE)); else l2_colors = 1; /* for scalability, configure at least PAGE_COLORS_MIN color bins */ page_colors = MAX(l2_colors, PAGE_COLORS_MIN); /* * cpu_page_colors is non-zero when a page color may be spread across * multiple bins. */ if (l2_colors < page_colors) cpu_page_colors = l2_colors; ASSERT(ISP2(page_colors)); page_colors_mask = page_colors - 1; ASSERT(ISP2(CPUSETSIZE())); page_coloring_shift = lowbit(CPUSETSIZE()); /* initialize number of colors per page size */ for (i = 0; i <= mmu.max_page_level; i++) { hw_page_array[i].hp_size = LEVEL_SIZE(i); hw_page_array[i].hp_shift = LEVEL_SHIFT(i); hw_page_array[i].hp_pgcnt = LEVEL_SIZE(i) >> LEVEL_SHIFT(0); hw_page_array[i].hp_colors = (page_colors_mask >> (hw_page_array[i].hp_shift - hw_page_array[0].hp_shift)) + 1; colorequivszc[i] = 0; } /* * The value of cpu_page_colors determines if additional color bins * need to be checked for a particular color in the page_get routines. */ if (cpu_page_colors != 0) { int a = lowbit(page_colors) - lowbit(cpu_page_colors); ASSERT(a > 0); ASSERT(a < 16); for (i = 0; i <= mmu.max_page_level; i++) { if ((colors = hw_page_array[i].hp_colors) <= 1) { colorequivszc[i] = 0; continue; } while ((colors >> a) == 0) a--; ASSERT(a >= 0); /* higher 4 bits encodes color equiv mask */ colorequivszc[i] = (a << 4); } } /* factor in colorequiv to check additional 'equivalent' bins. */ if (colorequiv > 1) { int a = lowbit(colorequiv) - 1; if (a > 15) a = 15; for (i = 0; i <= mmu.max_page_level; i++) { if ((colors = hw_page_array[i].hp_colors) <= 1) { continue; } while ((colors >> a) == 0) a--; if ((a << 4) > colorequivszc[i]) { colorequivszc[i] = (a << 4); } } } /* size for mnoderanges */ for (mnoderangecnt = 0, i = 0; i < max_mem_nodes; i++) mnoderangecnt += mnode_range_cnt(i); colorsz = mnoderangecnt * sizeof (mnoderange_t); /* size for fpc_mutex and cpc_mutex */ colorsz += (2 * max_mem_nodes * sizeof (kmutex_t) * NPC_MUTEX); /* size of page_freelists */ colorsz += mnoderangecnt * sizeof (page_t ***); colorsz += mnoderangecnt * mmu_page_sizes * sizeof (page_t **); for (i = 0; i < mmu_page_sizes; i++) { colors = page_get_pagecolors(i); colorsz += mnoderangecnt * colors * sizeof (page_t *); } /* size of page_cachelists */ colorsz += mnoderangecnt * sizeof (page_t **); colorsz += mnoderangecnt * page_colors * sizeof (page_t *); return (colorsz); } /* * Called once at startup to configure page_coloring data structures and * does the 1st page_free()/page_freelist_add(). */ void page_coloring_setup(caddr_t pcmemaddr) { int i; int j; int k; caddr_t addr; int colors; /* * do page coloring setup */ addr = pcmemaddr; mnoderanges = (mnoderange_t *)addr; addr += (mnoderangecnt * sizeof (mnoderange_t)); mnode_range_setup(mnoderanges); if (physmax4g) mtype4g = pfn_2_mtype(0xfffff); for (k = 0; k < NPC_MUTEX; k++) { fpc_mutex[k] = (kmutex_t *)addr; addr += (max_mem_nodes * sizeof (kmutex_t)); } for (k = 0; k < NPC_MUTEX; k++) { cpc_mutex[k] = (kmutex_t *)addr; addr += (max_mem_nodes * sizeof (kmutex_t)); } page_freelists = (page_t ****)addr; addr += (mnoderangecnt * sizeof (page_t ***)); page_cachelists = (page_t ***)addr; addr += (mnoderangecnt * sizeof (page_t **)); for (i = 0; i < mnoderangecnt; i++) { page_freelists[i] = (page_t ***)addr; addr += (mmu_page_sizes * sizeof (page_t **)); for (j = 0; j < mmu_page_sizes; j++) { colors = page_get_pagecolors(j); page_freelists[i][j] = (page_t **)addr; addr += (colors * sizeof (page_t *)); } page_cachelists[i] = (page_t **)addr; addr += (page_colors * sizeof (page_t *)); } } #if defined(__xpv) /* * Give back 10% of the io_pool pages to the free list. * Don't shrink the pool below some absolute minimum. */ static void page_io_pool_shrink() { int retcnt; page_t *pp, *pp_first, *pp_last, **curpool; mfn_t mfn; int bothpools = 0; mutex_enter(&io_pool_lock); io_pool_shrink_attempts++; /* should be a kstat? */ retcnt = io_pool_cnt / 10; if (io_pool_cnt - retcnt < io_pool_cnt_min) retcnt = io_pool_cnt - io_pool_cnt_min; if (retcnt <= 0) goto done; io_pool_shrinks++; /* should be a kstat? */ curpool = &io_pool_4g; domore: /* * Loop through taking pages from the end of the list * (highest mfns) till amount to return reached. */ for (pp = *curpool; pp && retcnt > 0; ) { pp_first = pp_last = pp->p_prev; if (pp_first == *curpool) break; retcnt--; io_pool_cnt--; page_io_pool_sub(curpool, pp_first, pp_last); if ((mfn = pfn_to_mfn(pp->p_pagenum)) < start_mfn) start_mfn = mfn; page_free(pp_first, 1); pp = *curpool; } if (retcnt != 0 && !bothpools) { /* * If not enough found in less constrained pool try the * more constrained one. */ curpool = &io_pool_16m; bothpools = 1; goto domore; } done: mutex_exit(&io_pool_lock); } #endif /* __xpv */ uint_t page_create_update_flags_x86(uint_t flags) { #if defined(__xpv) /* * Check this is an urgent allocation and free pages are depleted. */ if (!(flags & PG_WAIT) && freemem < desfree) page_io_pool_shrink(); #else /* !__xpv */ /* * page_create_get_something may call this because 4g memory may be * depleted. Set flags to allow for relocation of base page below * 4g if necessary. */ if (physmax4g) flags |= (PGI_PGCPSZC0 | PGI_PGCPHIPRI); #endif /* __xpv */ return (flags); } /*ARGSUSED*/ int bp_color(struct buf *bp) { return (0); } #if defined(__xpv) /* * Take pages out of an io_pool */ static void page_io_pool_sub(page_t **poolp, page_t *pp_first, page_t *pp_last) { if (*poolp == pp_first) { *poolp = pp_last->p_next; if (*poolp == pp_first) *poolp = NULL; } pp_first->p_prev->p_next = pp_last->p_next; pp_last->p_next->p_prev = pp_first->p_prev; pp_first->p_prev = pp_last; pp_last->p_next = pp_first; } /* * Put a page on the io_pool list. The list is ordered by increasing MFN. */ static void page_io_pool_add(page_t **poolp, page_t *pp) { page_t *look; mfn_t mfn = mfn_list[pp->p_pagenum]; if (*poolp == NULL) { *poolp = pp; pp->p_next = pp; pp->p_prev = pp; return; } /* * Since we try to take pages from the high end of the pool * chances are good that the pages to be put on the list will * go at or near the end of the list. so start at the end and * work backwards. */ look = (*poolp)->p_prev; while (mfn < mfn_list[look->p_pagenum]) { look = look->p_prev; if (look == (*poolp)->p_prev) break; /* backed all the way to front of list */ } /* insert after look */ pp->p_prev = look; pp->p_next = look->p_next; pp->p_next->p_prev = pp; look->p_next = pp; if (mfn < mfn_list[(*poolp)->p_pagenum]) { /* * we inserted a new first list element * adjust pool pointer to newly inserted element */ *poolp = pp; } } /* * Add a page to the io_pool. Setting the force flag will force the page * into the io_pool no matter what. */ static void add_page_to_pool(page_t *pp, int force) { page_t *highest; page_t *freep = NULL; mutex_enter(&io_pool_lock); /* * Always keep the scarce low memory pages */ if (mfn_list[pp->p_pagenum] < PFN_16MEG) { ++io_pool_cnt; page_io_pool_add(&io_pool_16m, pp); goto done; } if (io_pool_cnt < io_pool_cnt_max || force || io_pool_4g == NULL) { ++io_pool_cnt; page_io_pool_add(&io_pool_4g, pp); } else { highest = io_pool_4g->p_prev; if (mfn_list[pp->p_pagenum] < mfn_list[highest->p_pagenum]) { page_io_pool_sub(&io_pool_4g, highest, highest); page_io_pool_add(&io_pool_4g, pp); freep = highest; } else { freep = pp; } } done: mutex_exit(&io_pool_lock); if (freep) page_free(freep, 1); } int contig_pfn_cnt; /* no of pfns in the contig pfn list */ int contig_pfn_max; /* capacity of the contig pfn list */ int next_alloc_pfn; /* next position in list to start a contig search */ int contig_pfnlist_updates; /* pfn list update count */ int contig_pfnlist_builds; /* how many times have we (re)built list */ int contig_pfnlist_buildfailed; /* how many times has list build failed */ int create_contig_pending; /* nonzero means taskq creating contig list */ pfn_t *contig_pfn_list = NULL; /* list of contig pfns in ascending mfn order */ /* * Function to use in sorting a list of pfns by their underlying mfns. */ static int mfn_compare(const void *pfnp1, const void *pfnp2) { mfn_t mfn1 = mfn_list[*(pfn_t *)pfnp1]; mfn_t mfn2 = mfn_list[*(pfn_t *)pfnp2]; if (mfn1 > mfn2) return (1); if (mfn1 < mfn2) return (-1); return (0); } /* * Compact the contig_pfn_list by tossing all the non-contiguous * elements from the list. */ static void compact_contig_pfn_list(void) { pfn_t pfn, lapfn, prev_lapfn; mfn_t mfn; int i, newcnt = 0; prev_lapfn = 0; for (i = 0; i < contig_pfn_cnt - 1; i++) { pfn = contig_pfn_list[i]; lapfn = contig_pfn_list[i + 1]; mfn = mfn_list[pfn]; /* * See if next pfn is for a contig mfn */ if (mfn_list[lapfn] != mfn + 1) continue; /* * pfn and lookahead are both put in list * unless pfn is the previous lookahead. */ if (pfn != prev_lapfn) contig_pfn_list[newcnt++] = pfn; contig_pfn_list[newcnt++] = lapfn; prev_lapfn = lapfn; } for (i = newcnt; i < contig_pfn_cnt; i++) contig_pfn_list[i] = 0; contig_pfn_cnt = newcnt; } /*ARGSUSED*/ static void call_create_contiglist(void *arg) { (void) create_contig_pfnlist(PG_WAIT); } /* * Create list of freelist pfns that have underlying * contiguous mfns. The list is kept in ascending mfn order. * returns 1 if list created else 0. */ static int create_contig_pfnlist(uint_t flags) { pfn_t pfn; page_t *pp; int ret = 1; mutex_enter(&contig_list_lock); if (contig_pfn_list != NULL) goto out; contig_pfn_max = freemem + (freemem / 10); contig_pfn_list = kmem_zalloc(contig_pfn_max * sizeof (pfn_t), (flags & PG_WAIT) ? KM_SLEEP : KM_NOSLEEP); if (contig_pfn_list == NULL) { /* * If we could not create the contig list (because * we could not sleep for memory). Dispatch a taskq that can * sleep to get the memory. */ if (!create_contig_pending) { if (taskq_dispatch(system_taskq, call_create_contiglist, NULL, TQ_NOSLEEP) != NULL) create_contig_pending = 1; } contig_pfnlist_buildfailed++; /* count list build failures */ ret = 0; goto out; } create_contig_pending = 0; ASSERT(contig_pfn_cnt == 0); for (pfn = 0; pfn < mfn_count; pfn++) { pp = page_numtopp_nolock(pfn); if (pp == NULL || !PP_ISFREE(pp)) continue; contig_pfn_list[contig_pfn_cnt] = pfn; if (++contig_pfn_cnt == contig_pfn_max) break; } qsort(contig_pfn_list, contig_pfn_cnt, sizeof (pfn_t), mfn_compare); compact_contig_pfn_list(); /* * Make sure next search of the newly created contiguous pfn * list starts at the beginning of the list. */ next_alloc_pfn = 0; contig_pfnlist_builds++; /* count list builds */ out: mutex_exit(&contig_list_lock); return (ret); } /* * Toss the current contig pfnlist. Someone is about to do a massive * update to pfn<->mfn mappings. So we have them destroy the list and lock * it till they are done with their update. */ void clear_and_lock_contig_pfnlist() { pfn_t *listp = NULL; size_t listsize; mutex_enter(&contig_list_lock); if (contig_pfn_list != NULL) { listp = contig_pfn_list; listsize = contig_pfn_max * sizeof (pfn_t); contig_pfn_list = NULL; contig_pfn_max = contig_pfn_cnt = 0; } if (listp != NULL) kmem_free(listp, listsize); } /* * Unlock the contig_pfn_list. The next attempted use of it will cause * it to be re-created. */ void unlock_contig_pfnlist() { mutex_exit(&contig_list_lock); } /* * Update the contiguous pfn list in response to a pfn <-> mfn reassignment */ void update_contig_pfnlist(pfn_t pfn, mfn_t oldmfn, mfn_t newmfn) { int probe_hi, probe_lo, probe_pos, insert_after, insert_point; pfn_t probe_pfn; mfn_t probe_mfn; int drop_lock = 0; if (mutex_owner(&contig_list_lock) != curthread) { drop_lock = 1; mutex_enter(&contig_list_lock); } if (contig_pfn_list == NULL) goto done; contig_pfnlist_updates++; /* * Find the pfn in the current list. Use a binary chop to locate it. */ probe_hi = contig_pfn_cnt - 1; probe_lo = 0; probe_pos = (probe_hi + probe_lo) / 2; while ((probe_pfn = contig_pfn_list[probe_pos]) != pfn) { if (probe_pos == probe_lo) { /* pfn not in list */ probe_pos = -1; break; } if (pfn_to_mfn(probe_pfn) <= oldmfn) probe_lo = probe_pos; else probe_hi = probe_pos; probe_pos = (probe_hi + probe_lo) / 2; } if (probe_pos >= 0) { /* remove pfn fom list */ contig_pfn_cnt--; ovbcopy(&contig_pfn_list[probe_pos + 1], &contig_pfn_list[probe_pos], (contig_pfn_cnt - probe_pos) * sizeof (pfn_t)); } if (newmfn == MFN_INVALID) goto done; /* * Check if new mfn has adjacent mfns in the list */ probe_hi = contig_pfn_cnt - 1; probe_lo = 0; insert_after = -2; do { probe_pos = (probe_hi + probe_lo) / 2; probe_mfn = pfn_to_mfn(contig_pfn_list[probe_pos]); if (newmfn == probe_mfn + 1) insert_after = probe_pos; else if (newmfn == probe_mfn - 1) insert_after = probe_pos - 1; if (probe_pos == probe_lo) break; if (probe_mfn <= newmfn) probe_lo = probe_pos; else probe_hi = probe_pos; } while (insert_after == -2); /* * If there is space in the list and there are adjacent mfns * insert the pfn in to its proper place in the list. */ if (insert_after != -2 && contig_pfn_cnt + 1 <= contig_pfn_max) { insert_point = insert_after + 1; ovbcopy(&contig_pfn_list[insert_point], &contig_pfn_list[insert_point + 1], (contig_pfn_cnt - insert_point) * sizeof (pfn_t)); contig_pfn_list[insert_point] = pfn; contig_pfn_cnt++; } done: if (drop_lock) mutex_exit(&contig_list_lock); } /* * Called to (re-)populate the io_pool from the free page lists. */ long populate_io_pool(void) { pfn_t pfn; mfn_t mfn, max_mfn; page_t *pp; /* * Figure out the bounds of the pool on first invocation. * We use a percentage of memory for the io pool size. * we allow that to shrink, but not to less than a fixed minimum */ if (io_pool_cnt_max == 0) { io_pool_cnt_max = physmem / (100 / io_pool_physmem_pct); io_pool_cnt_lowater = io_pool_cnt_max; /* * This is the first time in populate_io_pool, grab a va to use * when we need to allocate pages. */ io_pool_kva = vmem_alloc(heap_arena, PAGESIZE, VM_SLEEP); } /* * If we are out of pages in the pool, then grow the size of the pool */ if (io_pool_cnt == 0) { /* * Grow the max size of the io pool by 5%, but never more than * 25% of physical memory. */ if (io_pool_cnt_max < physmem / 4) io_pool_cnt_max += io_pool_cnt_max / 20; } io_pool_grows++; /* should be a kstat? */ /* * Get highest mfn on this platform, but limit to the 32 bit DMA max. */ (void) mfn_to_pfn(start_mfn); max_mfn = MIN(cached_max_mfn, PFN_4GIG); for (mfn = start_mfn; mfn < max_mfn; start_mfn = ++mfn) { pfn = mfn_to_pfn(mfn); if (pfn & PFN_IS_FOREIGN_MFN) continue; /* * try to allocate it from free pages */ pp = page_numtopp_alloc(pfn); if (pp == NULL) continue; PP_CLRFREE(pp); add_page_to_pool(pp, 1); if (io_pool_cnt >= io_pool_cnt_max) break; } return (io_pool_cnt); } /* * Destroy a page that was being used for DMA I/O. It may or * may not actually go back to the io_pool. */ void page_destroy_io(page_t *pp) { mfn_t mfn = mfn_list[pp->p_pagenum]; /* * When the page was alloc'd a reservation was made, release it now */ page_unresv(1); /* * Unload translations, if any, then hash out the * page to erase its identity. */ (void) hat_pageunload(pp, HAT_FORCE_PGUNLOAD); page_hashout(pp, NULL); /* * If the page came from the free lists, just put it back to them. * DomU pages always go on the free lists as well. */ if (!DOMAIN_IS_INITDOMAIN(xen_info) || mfn >= PFN_4GIG) { page_free(pp, 1); return; } add_page_to_pool(pp, 0); } long contig_searches; /* count of times contig pages requested */ long contig_search_restarts; /* count of contig ranges tried */ long contig_search_failed; /* count of contig alloc failures */ /* * Look thru the contiguous pfns that are not part of the io_pool for * contiguous free pages. Return a list of the found pages or NULL. */ page_t * find_contig_free(uint_t npages, uint_t flags, uint64_t pfnseg) { page_t *pp, *plist = NULL; mfn_t mfn, prev_mfn, start_mfn; pfn_t pfn; int pages_needed, pages_requested; int search_start; /* * create the contig pfn list if not already done */ retry: mutex_enter(&contig_list_lock); if (contig_pfn_list == NULL) { mutex_exit(&contig_list_lock); if (!create_contig_pfnlist(flags)) { return (NULL); } goto retry; } contig_searches++; /* * Search contiguous pfn list for physically contiguous pages not in * the io_pool. Start the search where the last search left off. */ pages_requested = pages_needed = npages; search_start = next_alloc_pfn; start_mfn = prev_mfn = 0; while (pages_needed) { pfn = contig_pfn_list[next_alloc_pfn]; mfn = pfn_to_mfn(pfn); /* * Check if mfn is first one or contig to previous one and * if page corresponding to mfn is free and that mfn * range is not crossing a segment boundary. */ if ((prev_mfn == 0 || mfn == prev_mfn + 1) && (pp = page_numtopp_alloc(pfn)) != NULL && !((mfn & pfnseg) < (start_mfn & pfnseg))) { PP_CLRFREE(pp); page_io_pool_add(&plist, pp); pages_needed--; if (prev_mfn == 0) start_mfn = mfn; prev_mfn = mfn; } else { contig_search_restarts++; /* * free partial page list */ while (plist != NULL) { pp = plist; page_io_pool_sub(&plist, pp, pp); page_free(pp, 1); } pages_needed = pages_requested; start_mfn = prev_mfn = 0; } if (++next_alloc_pfn == contig_pfn_cnt) next_alloc_pfn = 0; if (next_alloc_pfn == search_start) break; /* all pfns searched */ } mutex_exit(&contig_list_lock); if (pages_needed) { contig_search_failed++; /* * Failed to find enough contig pages. * free partial page list */ while (plist != NULL) { pp = plist; page_io_pool_sub(&plist, pp, pp); page_free(pp, 1); } } return (plist); } /* * Search the reserved io pool pages for a page range with the * desired characteristics. */ page_t * page_io_pool_alloc(ddi_dma_attr_t *mattr, int contig, pgcnt_t minctg) { page_t *pp_first, *pp_last; page_t *pp, **poolp; pgcnt_t nwanted, pfnalign; uint64_t pfnseg; mfn_t mfn, tmfn, hi_mfn, lo_mfn; int align, attempt = 0; if (minctg == 1) contig = 0; lo_mfn = mmu_btop(mattr->dma_attr_addr_lo); hi_mfn = mmu_btop(mattr->dma_attr_addr_hi); pfnseg = mmu_btop(mattr->dma_attr_seg); align = maxbit(mattr->dma_attr_align, mattr->dma_attr_minxfer); if (align > MMU_PAGESIZE) pfnalign = mmu_btop(align); else pfnalign = 0; try_again: /* * See if we want pages for a legacy device */ if (hi_mfn < PFN_16MEG) poolp = &io_pool_16m; else poolp = &io_pool_4g; try_smaller: /* * Take pages from I/O pool. We'll use pages from the highest * MFN range possible. */ pp_first = pp_last = NULL; mutex_enter(&io_pool_lock); nwanted = minctg; for (pp = *poolp; pp && nwanted > 0; ) { pp = pp->p_prev; /* * skip pages above allowable range */ mfn = mfn_list[pp->p_pagenum]; if (hi_mfn < mfn) goto skip; /* * stop at pages below allowable range */ if (lo_mfn > mfn) break; restart: if (pp_last == NULL) { /* * Check alignment */ tmfn = mfn - (minctg - 1); if (pfnalign && tmfn != P2ROUNDUP(tmfn, pfnalign)) goto skip; /* not properly aligned */ /* * Check segment */ if ((mfn & pfnseg) < (tmfn & pfnseg)) goto skip; /* crosses seg boundary */ /* * Start building page list */ pp_first = pp_last = pp; nwanted--; } else { /* * check physical contiguity if required */ if (contig && mfn_list[pp_first->p_pagenum] != mfn + 1) { /* * not a contiguous page, restart list. */ pp_last = NULL; nwanted = minctg; goto restart; } else { /* add page to list */ pp_first = pp; nwanted--; } } skip: if (pp == *poolp) break; } /* * If we didn't find memory. Try the more constrained pool, then * sweep free pages into the DMA pool and try again. */ if (nwanted != 0) { mutex_exit(&io_pool_lock); /* * If we were looking in the less constrained pool and * didn't find pages, try the more constrained pool. */ if (poolp == &io_pool_4g) { poolp = &io_pool_16m; goto try_smaller; } kmem_reap(); if (++attempt < 4) { /* * Grab some more io_pool pages */ (void) populate_io_pool(); goto try_again; /* go around and retry */ } return (NULL); } /* * Found the pages, now snip them from the list */ page_io_pool_sub(poolp, pp_first, pp_last); io_pool_cnt -= minctg; /* * reset low water mark */ if (io_pool_cnt < io_pool_cnt_lowater) io_pool_cnt_lowater = io_pool_cnt; mutex_exit(&io_pool_lock); return (pp_first); } page_t * page_swap_with_hypervisor(struct vnode *vp, u_offset_t off, caddr_t vaddr, ddi_dma_attr_t *mattr, uint_t flags, pgcnt_t minctg) { uint_t kflags; int order, extra, extpages, i, contig, nbits, extents; page_t *pp, *expp, *pp_first, **pplist = NULL; mfn_t *mfnlist = NULL; contig = flags & PG_PHYSCONTIG; if (minctg == 1) contig = 0; flags &= ~PG_PHYSCONTIG; kflags = flags & PG_WAIT ? KM_SLEEP : KM_NOSLEEP; /* * Hypervisor will allocate extents, if we want contig * pages extent must be >= minctg */ if (contig) { order = highbit(minctg) - 1; if (minctg & ((1 << order) - 1)) order++; extpages = 1 << order; } else { order = 0; extpages = minctg; } if (extpages > minctg) { extra = extpages - minctg; if (!page_resv(extra, kflags)) return (NULL); } pp_first = NULL; pplist = kmem_alloc(extpages * sizeof (page_t *), kflags); if (pplist == NULL) goto balloon_fail; mfnlist = kmem_alloc(extpages * sizeof (mfn_t), kflags); if (mfnlist == NULL) goto balloon_fail; pp = page_create_va(vp, off, minctg * PAGESIZE, flags, &kvseg, vaddr); if (pp == NULL) goto balloon_fail; pp_first = pp; if (extpages > minctg) { /* * fill out the rest of extent pages to swap * with the hypervisor */ for (i = 0; i < extra; i++) { expp = page_create_va(vp, (u_offset_t)(uintptr_t)io_pool_kva, PAGESIZE, flags, &kvseg, io_pool_kva); if (expp == NULL) goto balloon_fail; (void) hat_pageunload(expp, HAT_FORCE_PGUNLOAD); page_io_unlock(expp); page_hashout(expp, NULL); page_io_lock(expp); /* * add page to end of list */ expp->p_prev = pp_first->p_prev; expp->p_next = pp_first; expp->p_prev->p_next = expp; pp_first->p_prev = expp; } } for (i = 0; i < extpages; i++) { pplist[i] = pp; pp = pp->p_next; } nbits = highbit(mattr->dma_attr_addr_hi); extents = contig ? 1 : minctg; if (balloon_replace_pages(extents, pplist, nbits, order, mfnlist) != extents) { if (ioalloc_dbg) cmn_err(CE_NOTE, "request to hypervisor" " for %d pages, maxaddr %" PRIx64 " failed", extpages, mattr->dma_attr_addr_hi); goto balloon_fail; } kmem_free(pplist, extpages * sizeof (page_t *)); kmem_free(mfnlist, extpages * sizeof (mfn_t)); /* * Return any excess pages to free list */ if (extpages > minctg) { for (i = 0; i < extra; i++) { pp = pp_first->p_prev; page_sub(&pp_first, pp); page_io_unlock(pp); page_unresv(1); page_free(pp, 1); } } return (pp_first); balloon_fail: /* * Return pages to free list and return failure */ while (pp_first != NULL) { pp = pp_first; page_sub(&pp_first, pp); page_io_unlock(pp); if (pp->p_vnode != NULL) page_hashout(pp, NULL); page_free(pp, 1); } if (pplist) kmem_free(pplist, extpages * sizeof (page_t *)); if (mfnlist) kmem_free(mfnlist, extpages * sizeof (mfn_t)); page_unresv(extpages - minctg); return (NULL); } static void return_partial_alloc(page_t *plist) { page_t *pp; while (plist != NULL) { pp = plist; page_sub(&plist, pp); page_destroy_io(pp); } } static page_t * page_get_contigpages( struct vnode *vp, u_offset_t off, int *npagesp, uint_t flags, caddr_t vaddr, ddi_dma_attr_t *mattr) { mfn_t max_mfn = HYPERVISOR_memory_op(XENMEM_maximum_ram_page, NULL); page_t *plist; /* list to return */ page_t *pp, *mcpl; int contig, anyaddr, npages, getone = 0; mfn_t lo_mfn; mfn_t hi_mfn; pgcnt_t pfnalign = 0; int align, sgllen; uint64_t pfnseg; pgcnt_t minctg; npages = *npagesp; ASSERT(mattr != NULL); lo_mfn = mmu_btop(mattr->dma_attr_addr_lo); hi_mfn = mmu_btop(mattr->dma_attr_addr_hi); sgllen = mattr->dma_attr_sgllen; pfnseg = mmu_btop(mattr->dma_attr_seg); align = maxbit(mattr->dma_attr_align, mattr->dma_attr_minxfer); if (align > MMU_PAGESIZE) pfnalign = mmu_btop(align); /* * Clear the contig flag if only one page is needed. */ contig = flags & PG_PHYSCONTIG; if (npages == 1) { getone = 1; contig = 0; } /* * Check if any page in the system is fine. */ anyaddr = lo_mfn == 0 && hi_mfn >= max_mfn && !pfnalign; if (!contig && anyaddr) { flags &= ~PG_PHYSCONTIG; plist = page_create_va(vp, off, npages * MMU_PAGESIZE, flags, &kvseg, vaddr); if (plist != NULL) { *npagesp = 0; return (plist); } } plist = NULL; minctg = howmany(npages, sgllen); while (npages > sgllen || getone) { if (minctg > npages) minctg = npages; mcpl = NULL; /* * We could just want unconstrained but contig pages. */ if (anyaddr && contig) { /* * Look for free contig pages to satisfy the request. */ mcpl = find_contig_free(minctg, flags, pfnseg); } /* * Try the reserved io pools next */ if (mcpl == NULL) mcpl = page_io_pool_alloc(mattr, contig, minctg); if (mcpl != NULL) { pp = mcpl; do { if (!page_hashin(pp, vp, off, NULL)) { panic("page_get_contigpages:" " hashin failed" " pp %p, vp %p, off %llx", (void *)pp, (void *)vp, off); } off += MMU_PAGESIZE; PP_CLRFREE(pp); PP_CLRAGED(pp); page_set_props(pp, P_REF); page_io_lock(pp); pp = pp->p_next; } while (pp != mcpl); } else { /* * Hypervisor exchange doesn't handle segment or * alignment constraints */ if (mattr->dma_attr_seg < mattr->dma_attr_addr_hi || pfnalign) goto fail; /* * Try exchanging pages with the hypervisor */ mcpl = page_swap_with_hypervisor(vp, off, vaddr, mattr, flags, minctg); if (mcpl == NULL) goto fail; off += minctg * MMU_PAGESIZE; } check_dma(mattr, mcpl, minctg); /* * Here with a minctg run of contiguous pages, add them to the * list we will return for this request. */ page_list_concat(&plist, &mcpl); npages -= minctg; *npagesp = npages; sgllen--; if (getone) break; } return (plist); fail: return_partial_alloc(plist); return (NULL); } /* * Allocator for domain 0 I/O pages. We match the required * DMA attributes and contiguity constraints. */ /*ARGSUSED*/ page_t * page_create_io( struct vnode *vp, u_offset_t off, uint_t bytes, uint_t flags, struct as *as, caddr_t vaddr, ddi_dma_attr_t *mattr) { page_t *plist = NULL, *pp; int npages = 0, contig, anyaddr, pages_req; mfn_t lo_mfn; mfn_t hi_mfn; pgcnt_t pfnalign = 0; int align; int is_domu = 0; int dummy, bytes_got; mfn_t max_mfn = HYPERVISOR_memory_op(XENMEM_maximum_ram_page, NULL); ASSERT(mattr != NULL); lo_mfn = mmu_btop(mattr->dma_attr_addr_lo); hi_mfn = mmu_btop(mattr->dma_attr_addr_hi); align = maxbit(mattr->dma_attr_align, mattr->dma_attr_minxfer); if (align > MMU_PAGESIZE) pfnalign = mmu_btop(align); /* * Clear the contig flag if only one page is needed or the scatter * gather list length is >= npages. */ pages_req = npages = mmu_btopr(bytes); contig = (flags & PG_PHYSCONTIG); bytes = P2ROUNDUP(bytes, MMU_PAGESIZE); if (bytes == MMU_PAGESIZE || mattr->dma_attr_sgllen >= npages) contig = 0; /* * Check if any old page in the system is fine. * DomU should always go down this path. */ is_domu = !DOMAIN_IS_INITDOMAIN(xen_info); anyaddr = lo_mfn == 0 && hi_mfn >= max_mfn && !pfnalign; if ((!contig && anyaddr) || is_domu) { flags &= ~PG_PHYSCONTIG; plist = page_create_va(vp, off, bytes, flags, &kvseg, vaddr); if (plist != NULL) return (plist); else if (is_domu) return (NULL); /* no memory available */ } /* * DomU should never reach here */ if (contig) { plist = page_get_contigpages(vp, off, &npages, flags, vaddr, mattr); if (plist == NULL) goto fail; bytes_got = (pages_req - npages) << MMU_PAGESHIFT; vaddr += bytes_got; off += bytes_got; /* * We now have all the contiguous pages we need, but * we may still need additional non-contiguous pages. */ } /* * now loop collecting the requested number of pages, these do * not have to be contiguous pages but we will use the contig * page alloc code to get the pages since it will honor any * other constraints the pages may have. */ while (npages--) { dummy = 1; pp = page_get_contigpages(vp, off, &dummy, flags, vaddr, mattr); if (pp == NULL) goto fail; page_add(&plist, pp); vaddr += MMU_PAGESIZE; off += MMU_PAGESIZE; } return (plist); fail: /* * Failed to get enough pages, return ones we did get */ return_partial_alloc(plist); return (NULL); } /* * Lock and return the page with the highest mfn that we can find. last_mfn * holds the last one found, so the next search can start from there. We * also keep a counter so that we don't loop forever if the machine has no * free pages. * * This is called from the balloon thread to find pages to give away. new_high * is used when new mfn's have been added to the system - we will reset our * search if the new mfn's are higher than our current search position. */ page_t * page_get_high_mfn(mfn_t new_high) { static mfn_t last_mfn = 0; pfn_t pfn; page_t *pp; ulong_t loop_count = 0; if (new_high > last_mfn) last_mfn = new_high; for (; loop_count < mfn_count; loop_count++, last_mfn--) { if (last_mfn == 0) { last_mfn = cached_max_mfn; } pfn = mfn_to_pfn(last_mfn); if (pfn & PFN_IS_FOREIGN_MFN) continue; /* See if the page is free. If so, lock it. */ pp = page_numtopp_alloc(pfn); if (pp == NULL) continue; PP_CLRFREE(pp); ASSERT(PAGE_EXCL(pp)); ASSERT(pp->p_vnode == NULL); ASSERT(!hat_page_is_mapped(pp)); last_mfn--; return (pp); } return (NULL); } #else /* !__xpv */ /* * get a page from any list with the given mnode */ static page_t * page_get_mnode_anylist(ulong_t origbin, uchar_t szc, uint_t flags, int mnode, int mtype, ddi_dma_attr_t *dma_attr) { kmutex_t *pcm; int i; page_t *pp; page_t *first_pp; uint64_t pgaddr; ulong_t bin; int mtypestart; int plw_initialized; page_list_walker_t plw; VM_STAT_ADD(pga_vmstats.pgma_alloc); ASSERT((flags & PG_MATCH_COLOR) == 0); ASSERT(szc == 0); ASSERT(dma_attr != NULL); MTYPE_START(mnode, mtype, flags); if (mtype < 0) { VM_STAT_ADD(pga_vmstats.pgma_allocempty); return (NULL); } mtypestart = mtype; bin = origbin; /* * check up to page_colors + 1 bins - origbin may be checked twice * because of BIN_STEP skip */ do { plw_initialized = 0; for (plw.plw_count = 0; plw.plw_count < page_colors; plw.plw_count++) { if (PAGE_FREELISTS(mnode, szc, bin, mtype) == NULL) goto nextfreebin; pcm = PC_BIN_MUTEX(mnode, bin, PG_FREE_LIST); mutex_enter(pcm); pp = PAGE_FREELISTS(mnode, szc, bin, mtype); first_pp = pp; while (pp != NULL) { if (page_trylock(pp, SE_EXCL) == 0) { pp = pp->p_next; if (pp == first_pp) { pp = NULL; } continue; } ASSERT(PP_ISFREE(pp)); ASSERT(PP_ISAGED(pp)); ASSERT(pp->p_vnode == NULL); ASSERT(pp->p_hash == NULL); ASSERT(pp->p_offset == (u_offset_t)-1); ASSERT(pp->p_szc == szc); ASSERT(PFN_2_MEM_NODE(pp->p_pagenum) == mnode); /* check if page within DMA attributes */ pgaddr = pa_to_ma(pfn_to_pa(pp->p_pagenum)); if ((pgaddr >= dma_attr->dma_attr_addr_lo) && (pgaddr + MMU_PAGESIZE - 1 <= dma_attr->dma_attr_addr_hi)) { break; } /* continue looking */ page_unlock(pp); pp = pp->p_next; if (pp == first_pp) pp = NULL; } if (pp != NULL) { ASSERT(mtype == PP_2_MTYPE(pp)); ASSERT(pp->p_szc == 0); /* found a page with specified DMA attributes */ page_sub(&PAGE_FREELISTS(mnode, szc, bin, mtype), pp); page_ctr_sub(mnode, mtype, pp, PG_FREE_LIST); if ((PP_ISFREE(pp) == 0) || (PP_ISAGED(pp) == 0)) { cmn_err(CE_PANIC, "page %p is not free", (void *)pp); } mutex_exit(pcm); check_dma(dma_attr, pp, 1); VM_STAT_ADD(pga_vmstats.pgma_allocok); return (pp); } mutex_exit(pcm); nextfreebin: if (plw_initialized == 0) { page_list_walk_init(szc, 0, bin, 1, 0, &plw); ASSERT(plw.plw_ceq_dif == page_colors); plw_initialized = 1; } if (plw.plw_do_split) { pp = page_freelist_split(szc, bin, mnode, mtype, mmu_btop(dma_attr->dma_attr_addr_hi + 1), &plw); if (pp != NULL) return (pp); } bin = page_list_walk_next_bin(szc, bin, &plw); } MTYPE_NEXT(mnode, mtype, flags); } while (mtype >= 0); /* failed to find a page in the freelist; try it in the cachelist */ /* reset mtype start for cachelist search */ mtype = mtypestart; ASSERT(mtype >= 0); /* start with the bin of matching color */ bin = origbin; do { for (i = 0; i <= page_colors; i++) { if (PAGE_CACHELISTS(mnode, bin, mtype) == NULL) goto nextcachebin; pcm = PC_BIN_MUTEX(mnode, bin, PG_CACHE_LIST); mutex_enter(pcm); pp = PAGE_CACHELISTS(mnode, bin, mtype); first_pp = pp; while (pp != NULL) { if (page_trylock(pp, SE_EXCL) == 0) { pp = pp->p_next; if (pp == first_pp) break; continue; } ASSERT(pp->p_vnode); ASSERT(PP_ISAGED(pp) == 0); ASSERT(pp->p_szc == 0); ASSERT(PFN_2_MEM_NODE(pp->p_pagenum) == mnode); /* check if page within DMA attributes */ pgaddr = pa_to_ma(pfn_to_pa(pp->p_pagenum)); if ((pgaddr >= dma_attr->dma_attr_addr_lo) && (pgaddr + MMU_PAGESIZE - 1 <= dma_attr->dma_attr_addr_hi)) { break; } /* continue looking */ page_unlock(pp); pp = pp->p_next; if (pp == first_pp) pp = NULL; } if (pp != NULL) { ASSERT(mtype == PP_2_MTYPE(pp)); ASSERT(pp->p_szc == 0); /* found a page with specified DMA attributes */ page_sub(&PAGE_CACHELISTS(mnode, bin, mtype), pp); page_ctr_sub(mnode, mtype, pp, PG_CACHE_LIST); mutex_exit(pcm); ASSERT(pp->p_vnode); ASSERT(PP_ISAGED(pp) == 0); check_dma(dma_attr, pp, 1); VM_STAT_ADD(pga_vmstats.pgma_allocok); return (pp); } mutex_exit(pcm); nextcachebin: bin += (i == 0) ? BIN_STEP : 1; bin &= page_colors_mask; } MTYPE_NEXT(mnode, mtype, flags); } while (mtype >= 0); VM_STAT_ADD(pga_vmstats.pgma_allocfailed); return (NULL); } /* * This function is similar to page_get_freelist()/page_get_cachelist() * but it searches both the lists to find a page with the specified * color (or no color) and DMA attributes. The search is done in the * freelist first and then in the cache list within the highest memory * range (based on DMA attributes) before searching in the lower * memory ranges. * * Note: This function is called only by page_create_io(). */ /*ARGSUSED*/ static page_t * page_get_anylist(struct vnode *vp, u_offset_t off, struct as *as, caddr_t vaddr, size_t size, uint_t flags, ddi_dma_attr_t *dma_attr, lgrp_t *lgrp) { uint_t bin; int mtype; page_t *pp; int n; int m; int szc; int fullrange; int mnode; int local_failed_stat = 0; lgrp_mnode_cookie_t lgrp_cookie; VM_STAT_ADD(pga_vmstats.pga_alloc); /* only base pagesize currently supported */ if (size != MMU_PAGESIZE) return (NULL); /* * If we're passed a specific lgroup, we use it. Otherwise, * assume first-touch placement is desired. */ if (!LGRP_EXISTS(lgrp)) lgrp = lgrp_home_lgrp(); /* LINTED */ AS_2_BIN(as, seg, vp, vaddr, bin, 0); /* * Only hold one freelist or cachelist lock at a time, that way we * can start anywhere and not have to worry about lock * ordering. */ if (dma_attr == NULL) { n = 0; m = mnoderangecnt - 1; fullrange = 1; VM_STAT_ADD(pga_vmstats.pga_nulldmaattr); } else { pfn_t pfnlo = mmu_btop(dma_attr->dma_attr_addr_lo); pfn_t pfnhi = mmu_btop(dma_attr->dma_attr_addr_hi); /* * We can guarantee alignment only for page boundary. */ if (dma_attr->dma_attr_align > MMU_PAGESIZE) return (NULL); n = pfn_2_mtype(pfnlo); m = pfn_2_mtype(pfnhi); fullrange = ((pfnlo == mnoderanges[n].mnr_pfnlo) && (pfnhi >= mnoderanges[m].mnr_pfnhi)); } VM_STAT_COND_ADD(fullrange == 0, pga_vmstats.pga_notfullrange); if (n > m) return (NULL); szc = 0; /* cylcing thru mtype handled by RANGE0 if n == 0 */ if (n == 0) { flags |= PGI_MT_RANGE0; n = m; } /* * Try local memory node first, but try remote if we can't * get a page of the right color. */ LGRP_MNODE_COOKIE_INIT(lgrp_cookie, lgrp, LGRP_SRCH_HIER); while ((mnode = lgrp_memnode_choose(&lgrp_cookie)) >= 0) { /* * allocate pages from high pfn to low. */ for (mtype = m; mtype >= n; mtype--) { if (fullrange != 0) { pp = page_get_mnode_freelist(mnode, bin, mtype, szc, flags); if (pp == NULL) { pp = page_get_mnode_cachelist( bin, flags, mnode, mtype); } } else { pp = page_get_mnode_anylist(bin, szc, flags, mnode, mtype, dma_attr); } if (pp != NULL) { VM_STAT_ADD(pga_vmstats.pga_allocok); check_dma(dma_attr, pp, 1); return (pp); } } if (!local_failed_stat) { lgrp_stat_add(lgrp->lgrp_id, LGRP_NUM_ALLOC_FAIL, 1); local_failed_stat = 1; } } VM_STAT_ADD(pga_vmstats.pga_allocfailed); return (NULL); } /* * page_create_io() * * This function is a copy of page_create_va() with an additional * argument 'mattr' that specifies DMA memory requirements to * the page list functions. This function is used by the segkmem * allocator so it is only to create new pages (i.e PG_EXCL is * set). * * Note: This interface is currently used by x86 PSM only and is * not fully specified so the commitment level is only for * private interface specific to x86. This interface uses PSM * specific page_get_anylist() interface. */ #define PAGE_HASH_SEARCH(index, pp, vp, off) { \ for ((pp) = page_hash[(index)]; (pp); (pp) = (pp)->p_hash) { \ if ((pp)->p_vnode == (vp) && (pp)->p_offset == (off)) \ break; \ } \ } page_t * page_create_io( struct vnode *vp, u_offset_t off, uint_t bytes, uint_t flags, struct as *as, caddr_t vaddr, ddi_dma_attr_t *mattr) /* DMA memory attributes if any */ { page_t *plist = NULL; uint_t plist_len = 0; pgcnt_t npages; page_t *npp = NULL; uint_t pages_req; page_t *pp; kmutex_t *phm = NULL; uint_t index; TRACE_4(TR_FAC_VM, TR_PAGE_CREATE_START, "page_create_start:vp %p off %llx bytes %u flags %x", vp, off, bytes, flags); ASSERT((flags & ~(PG_EXCL | PG_WAIT | PG_PHYSCONTIG)) == 0); pages_req = npages = mmu_btopr(bytes); /* * Do the freemem and pcf accounting. */ if (!page_create_wait(npages, flags)) { return (NULL); } TRACE_2(TR_FAC_VM, TR_PAGE_CREATE_SUCCESS, "page_create_success:vp %p off %llx", vp, off); /* * If satisfying this request has left us with too little * memory, start the wheels turning to get some back. The * first clause of the test prevents waking up the pageout * daemon in situations where it would decide that there's * nothing to do. */ if (nscan < desscan && freemem < minfree) { TRACE_1(TR_FAC_VM, TR_PAGEOUT_CV_SIGNAL, "pageout_cv_signal:freemem %ld", freemem); cv_signal(&proc_pageout->p_cv); } if (flags & PG_PHYSCONTIG) { plist = page_get_contigpage(&npages, mattr, 1); if (plist == NULL) { page_create_putback(npages); return (NULL); } pp = plist; do { if (!page_hashin(pp, vp, off, NULL)) { panic("pg_creat_io: hashin failed %p %p %llx", (void *)pp, (void *)vp, off); } VM_STAT_ADD(page_create_new); off += MMU_PAGESIZE; PP_CLRFREE(pp); PP_CLRAGED(pp); page_set_props(pp, P_REF); pp = pp->p_next; } while (pp != plist); if (!npages) { check_dma(mattr, plist, pages_req); return (plist); } else { vaddr += (pages_req - npages) << MMU_PAGESHIFT; } /* * fall-thru: * * page_get_contigpage returns when npages <= sgllen. * Grab the rest of the non-contig pages below from anylist. */ } /* * Loop around collecting the requested number of pages. * Most of the time, we have to `create' a new page. With * this in mind, pull the page off the free list before * getting the hash lock. This will minimize the hash * lock hold time, nesting, and the like. If it turns * out we don't need the page, we put it back at the end. */ while (npages--) { phm = NULL; index = PAGE_HASH_FUNC(vp, off); top: ASSERT(phm == NULL); ASSERT(index == PAGE_HASH_FUNC(vp, off)); ASSERT(MUTEX_NOT_HELD(page_vnode_mutex(vp))); if (npp == NULL) { /* * Try to get the page of any color either from * the freelist or from the cache list. */ npp = page_get_anylist(vp, off, as, vaddr, MMU_PAGESIZE, flags & ~PG_MATCH_COLOR, mattr, NULL); if (npp == NULL) { if (mattr == NULL) { /* * Not looking for a special page; * panic! */ panic("no page found %d", (int)npages); } /* * No page found! This can happen * if we are looking for a page * within a specific memory range * for DMA purposes. If PG_WAIT is * specified then we wait for a * while and then try again. The * wait could be forever if we * don't get the page(s) we need. * * Note: XXX We really need a mechanism * to wait for pages in the desired * range. For now, we wait for any * pages and see if we can use it. */ if ((mattr != NULL) && (flags & PG_WAIT)) { delay(10); goto top; } goto fail; /* undo accounting stuff */ } if (PP_ISAGED(npp) == 0) { /* * Since this page came from the * cachelist, we must destroy the * old vnode association. */ page_hashout(npp, (kmutex_t *)NULL); } } /* * We own this page! */ ASSERT(PAGE_EXCL(npp)); ASSERT(npp->p_vnode == NULL); ASSERT(!hat_page_is_mapped(npp)); PP_CLRFREE(npp); PP_CLRAGED(npp); /* * Here we have a page in our hot little mits and are * just waiting to stuff it on the appropriate lists. * Get the mutex and check to see if it really does * not exist. */ phm = PAGE_HASH_MUTEX(index); mutex_enter(phm); PAGE_HASH_SEARCH(index, pp, vp, off); if (pp == NULL) { VM_STAT_ADD(page_create_new); pp = npp; npp = NULL; if (!page_hashin(pp, vp, off, phm)) { /* * Since we hold the page hash mutex and * just searched for this page, page_hashin * had better not fail. If it does, that * means somethread did not follow the * page hash mutex rules. Panic now and * get it over with. As usual, go down * holding all the locks. */ ASSERT(MUTEX_HELD(phm)); panic("page_create: hashin fail %p %p %llx %p", (void *)pp, (void *)vp, off, (void *)phm); } ASSERT(MUTEX_HELD(phm)); mutex_exit(phm); phm = NULL; /* * Hat layer locking need not be done to set * the following bits since the page is not hashed * and was on the free list (i.e., had no mappings). * * Set the reference bit to protect * against immediate pageout * * XXXmh modify freelist code to set reference * bit so we don't have to do it here. */ page_set_props(pp, P_REF); } else { ASSERT(MUTEX_HELD(phm)); mutex_exit(phm); phm = NULL; /* * NOTE: This should not happen for pages associated * with kernel vnode 'kvp'. */ /* XX64 - to debug why this happens! */ ASSERT(!VN_ISKAS(vp)); if (VN_ISKAS(vp)) cmn_err(CE_NOTE, "page_create: page not expected " "in hash list for kernel vnode - pp 0x%p", (void *)pp); VM_STAT_ADD(page_create_exists); goto fail; } /* * Got a page! It is locked. Acquire the i/o * lock since we are going to use the p_next and * p_prev fields to link the requested pages together. */ page_io_lock(pp); page_add(&plist, pp); plist = plist->p_next; off += MMU_PAGESIZE; vaddr += MMU_PAGESIZE; } check_dma(mattr, plist, pages_req); return (plist); fail: if (npp != NULL) { /* * Did not need this page after all. * Put it back on the free list. */ VM_STAT_ADD(page_create_putbacks); PP_SETFREE(npp); PP_SETAGED(npp); npp->p_offset = (u_offset_t)-1; page_list_add(npp, PG_FREE_LIST | PG_LIST_TAIL); page_unlock(npp); } /* * Give up the pages we already got. */ while (plist != NULL) { pp = plist; page_sub(&plist, pp); page_io_unlock(pp); plist_len++; /*LINTED: constant in conditional ctx*/ VN_DISPOSE(pp, B_INVAL, 0, kcred); } /* * VN_DISPOSE does freemem accounting for the pages in plist * by calling page_free. So, we need to undo the pcf accounting * for only the remaining pages. */ VM_STAT_ADD(page_create_putbacks); page_create_putback(pages_req - plist_len); return (NULL); } #endif /* !__xpv */ /* * Copy the data from the physical page represented by "frompp" to * that represented by "topp". ppcopy uses CPU->cpu_caddr1 and * CPU->cpu_caddr2. It assumes that no one uses either map at interrupt * level and no one sleeps with an active mapping there. * * Note that the ref/mod bits in the page_t's are not affected by * this operation, hence it is up to the caller to update them appropriately. */ int ppcopy(page_t *frompp, page_t *topp) { caddr_t pp_addr1; caddr_t pp_addr2; hat_mempte_t pte1; hat_mempte_t pte2; kmutex_t *ppaddr_mutex; label_t ljb; int ret = 1; ASSERT_STACK_ALIGNED(); ASSERT(PAGE_LOCKED(frompp)); ASSERT(PAGE_LOCKED(topp)); if (kpm_enable) { pp_addr1 = hat_kpm_page2va(frompp, 0); pp_addr2 = hat_kpm_page2va(topp, 0); kpreempt_disable(); } else { /* * disable pre-emption so that CPU can't change */ kpreempt_disable(); pp_addr1 = CPU->cpu_caddr1; pp_addr2 = CPU->cpu_caddr2; pte1 = CPU->cpu_caddr1pte; pte2 = CPU->cpu_caddr2pte; ppaddr_mutex = &CPU->cpu_ppaddr_mutex; mutex_enter(ppaddr_mutex); hat_mempte_remap(page_pptonum(frompp), pp_addr1, pte1, PROT_READ | HAT_STORECACHING_OK, HAT_LOAD_NOCONSIST); hat_mempte_remap(page_pptonum(topp), pp_addr2, pte2, PROT_READ | PROT_WRITE | HAT_STORECACHING_OK, HAT_LOAD_NOCONSIST); } if (on_fault(&ljb)) { ret = 0; goto faulted; } if (use_sse_pagecopy) #ifdef __xpv page_copy_no_xmm(pp_addr2, pp_addr1); #else hwblkpagecopy(pp_addr1, pp_addr2); #endif else bcopy(pp_addr1, pp_addr2, PAGESIZE); no_fault(); faulted: if (!kpm_enable) { #ifdef __xpv /* * We can't leave unused mappings laying about under the * hypervisor, so blow them away. */ if (HYPERVISOR_update_va_mapping((uintptr_t)pp_addr1, 0, UVMF_INVLPG | UVMF_LOCAL) < 0) panic("HYPERVISOR_update_va_mapping() failed"); if (HYPERVISOR_update_va_mapping((uintptr_t)pp_addr2, 0, UVMF_INVLPG | UVMF_LOCAL) < 0) panic("HYPERVISOR_update_va_mapping() failed"); #endif mutex_exit(ppaddr_mutex); } kpreempt_enable(); return (ret); } void pagezero(page_t *pp, uint_t off, uint_t len) { ASSERT(PAGE_LOCKED(pp)); pfnzero(page_pptonum(pp), off, len); } /* * Zero the physical page from off to off + len given by pfn * without changing the reference and modified bits of page. * * We use this using CPU private page address #2, see ppcopy() for more info. * pfnzero() must not be called at interrupt level. */ void pfnzero(pfn_t pfn, uint_t off, uint_t len) { caddr_t pp_addr2; hat_mempte_t pte2; kmutex_t *ppaddr_mutex = NULL; ASSERT_STACK_ALIGNED(); ASSERT(len <= MMU_PAGESIZE); ASSERT(off <= MMU_PAGESIZE); ASSERT(off + len <= MMU_PAGESIZE); if (kpm_enable && !pfn_is_foreign(pfn)) { pp_addr2 = hat_kpm_pfn2va(pfn); kpreempt_disable(); } else { kpreempt_disable(); pp_addr2 = CPU->cpu_caddr2; pte2 = CPU->cpu_caddr2pte; ppaddr_mutex = &CPU->cpu_ppaddr_mutex; mutex_enter(ppaddr_mutex); hat_mempte_remap(pfn, pp_addr2, pte2, PROT_READ | PROT_WRITE | HAT_STORECACHING_OK, HAT_LOAD_NOCONSIST); } if (use_sse_pagezero) { #ifdef __xpv uint_t rem; /* * zero a byte at a time until properly aligned for * block_zero_no_xmm(). */ while (!P2NPHASE(off, ((uint_t)BLOCKZEROALIGN)) && len-- > 0) pp_addr2[off++] = 0; /* * Now use faster block_zero_no_xmm() for any range * that is properly aligned and sized. */ rem = P2PHASE(len, ((uint_t)BLOCKZEROALIGN)); len -= rem; if (len != 0) { block_zero_no_xmm(pp_addr2 + off, len); off += len; } /* * zero remainder with byte stores. */ while (rem-- > 0) pp_addr2[off++] = 0; #else hwblkclr(pp_addr2 + off, len); #endif } else { bzero(pp_addr2 + off, len); } if (!kpm_enable || pfn_is_foreign(pfn)) { #ifdef __xpv /* * On the hypervisor this page might get used for a page * table before any intervening change to this mapping, * so blow it away. */ if (HYPERVISOR_update_va_mapping((uintptr_t)pp_addr2, 0, UVMF_INVLPG) < 0) panic("HYPERVISOR_update_va_mapping() failed"); #endif mutex_exit(ppaddr_mutex); } kpreempt_enable(); } /* * Platform-dependent page scrub call. */ void pagescrub(page_t *pp, uint_t off, uint_t len) { /* * For now, we rely on the fact that pagezero() will * always clear UEs. */ pagezero(pp, off, len); } /* * set up two private addresses for use on a given CPU for use in ppcopy() */ void setup_vaddr_for_ppcopy(struct cpu *cpup) { void *addr; hat_mempte_t pte_pa; addr = vmem_alloc(heap_arena, mmu_ptob(1), VM_SLEEP); pte_pa = hat_mempte_setup(addr); cpup->cpu_caddr1 = addr; cpup->cpu_caddr1pte = pte_pa; addr = vmem_alloc(heap_arena, mmu_ptob(1), VM_SLEEP); pte_pa = hat_mempte_setup(addr); cpup->cpu_caddr2 = addr; cpup->cpu_caddr2pte = pte_pa; mutex_init(&cpup->cpu_ppaddr_mutex, NULL, MUTEX_DEFAULT, NULL); } /* * Undo setup_vaddr_for_ppcopy */ void teardown_vaddr_for_ppcopy(struct cpu *cpup) { mutex_destroy(&cpup->cpu_ppaddr_mutex); hat_mempte_release(cpup->cpu_caddr2, cpup->cpu_caddr2pte); cpup->cpu_caddr2pte = 0; vmem_free(heap_arena, cpup->cpu_caddr2, mmu_ptob(1)); cpup->cpu_caddr2 = 0; hat_mempte_release(cpup->cpu_caddr1, cpup->cpu_caddr1pte); cpup->cpu_caddr1pte = 0; vmem_free(heap_arena, cpup->cpu_caddr1, mmu_ptob(1)); cpup->cpu_caddr1 = 0; } /* * Create the pageout scanner thread. The thread has to * start at procedure with process pp and priority pri. */ void pageout_init(void (*procedure)(), proc_t *pp, pri_t pri) { (void) thread_create(NULL, 0, procedure, NULL, 0, pp, TS_RUN, pri); } /* * Function for flushing D-cache when performing module relocations * to an alternate mapping. Unnecessary on Intel / AMD platforms. */ void dcache_flushall() {} size_t exec_get_spslew(void) { return (0); } /* * Allocate a memory page. The argument 'seed' can be any pseudo-random * number to vary where the pages come from. This is quite a hacked up * method -- it works for now, but really needs to be fixed up a bit. * * We currently use page_create_va() on the kvp with fake offsets, * segments and virt address. This is pretty bogus, but was copied from the * old hat_i86.c code. A better approach would be to specify either mnode * random or mnode local and takes a page from whatever color has the MOST * available - this would have a minimal impact on page coloring. */ page_t * page_get_physical(uintptr_t seed) { page_t *pp; u_offset_t offset; static struct seg tmpseg; static uintptr_t ctr = 0; /* * This code is gross, we really need a simpler page allocator. * * We need assign an offset for the page to call page_create_va(). * To avoid conflicts with other pages, we get creative with the offset. * For 32 bits, we pick an offset > 4Gig * For 64 bits, pick an offset somewhere in the VA hole. */ offset = seed; if (offset > kernelbase) offset -= kernelbase; offset <<= MMU_PAGESHIFT; #if defined(__amd64) offset += mmu.hole_start; /* something in VA hole */ #else offset += 1ULL << 40; /* something > 4 Gig */ #endif if (page_resv(1, KM_NOSLEEP) == 0) return (NULL); #ifdef DEBUG pp = page_exists(&kvp, offset); if (pp != NULL) panic("page already exists %p", pp); #endif pp = page_create_va(&kvp, offset, MMU_PAGESIZE, PG_EXCL, &tmpseg, (caddr_t)(ctr += MMU_PAGESIZE)); /* changing VA usage */ if (pp == NULL) return (NULL); page_io_unlock(pp); page_hashout(pp, NULL); return (pp); }