diff options
Diffstat (limited to 'sys/compat/linuxkpi/common/src/linux_page.c')
| -rw-r--r-- | sys/compat/linuxkpi/common/src/linux_page.c | 277 |
1 files changed, 277 insertions, 0 deletions
diff --git a/sys/compat/linuxkpi/common/src/linux_page.c b/sys/compat/linuxkpi/common/src/linux_page.c new file mode 100644 index 000000000000..ee41366c53a6 --- /dev/null +++ b/sys/compat/linuxkpi/common/src/linux_page.c @@ -0,0 +1,277 @@ +/*- + * Copyright (c) 2010 Isilon Systems, Inc. + * Copyright (c) 2016 Matthew Macy (mmacy@mattmacy.io) + * Copyright (c) 2017 Mellanox Technologies, Ltd. + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice unmodified, this list of conditions, and the following + * disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR + * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES + * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. + * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, + * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT + * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF + * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + */ + +#include <sys/cdefs.h> +__FBSDID("$FreeBSD$"); + +#include <sys/param.h> +#include <sys/systm.h> +#include <sys/malloc.h> +#include <sys/kernel.h> +#include <sys/sysctl.h> +#include <sys/lock.h> +#include <sys/mutex.h> +#include <sys/rwlock.h> +#include <sys/proc.h> +#include <sys/sched.h> + +#include <machine/bus.h> + +#include <vm/vm.h> +#include <vm/pmap.h> +#include <vm/vm_param.h> +#include <vm/vm_kern.h> +#include <vm/vm_object.h> +#include <vm/vm_map.h> +#include <vm/vm_page.h> +#include <vm/vm_pageout.h> +#include <vm/vm_pager.h> +#include <vm/vm_radix.h> +#include <vm/vm_reserv.h> +#include <vm/vm_extern.h> + +#include <vm/uma.h> +#include <vm/uma_int.h> + +#include <linux/gfp.h> +#include <linux/mm.h> +#include <linux/preempt.h> +#include <linux/fs.h> +#include <linux/shmem_fs.h> + +void +si_meminfo(struct sysinfo *si) +{ + si->totalram = physmem; + si->totalhigh = 0; + si->mem_unit = PAGE_SIZE; +} + +void * +linux_page_address(struct page *page) +{ + + if (page->object != kernel_object) { + return (PMAP_HAS_DMAP ? + ((void *)(uintptr_t)PHYS_TO_DMAP(VM_PAGE_TO_PHYS(page))) : + NULL); + } + return ((void *)(uintptr_t)(VM_MIN_KERNEL_ADDRESS + + IDX_TO_OFF(page->pindex))); +} + +vm_page_t +linux_alloc_pages(gfp_t flags, unsigned int order) +{ + vm_page_t page; + + if (PMAP_HAS_DMAP) { + unsigned long npages = 1UL << order; + int req = VM_ALLOC_NOOBJ | VM_ALLOC_WIRED | VM_ALLOC_NORMAL; + + if ((flags & M_ZERO) != 0) + req |= VM_ALLOC_ZERO; + if (order == 0 && (flags & GFP_DMA32) == 0) { + page = vm_page_alloc(NULL, 0, req); + if (page == NULL) + return (NULL); + } else { + vm_paddr_t pmax = (flags & GFP_DMA32) ? + BUS_SPACE_MAXADDR_32BIT : BUS_SPACE_MAXADDR; + retry: + page = vm_page_alloc_contig(NULL, 0, req, + npages, 0, pmax, PAGE_SIZE, 0, VM_MEMATTR_DEFAULT); + + if (page == NULL) { + if (flags & M_WAITOK) { + if (!vm_page_reclaim_contig(req, + npages, 0, pmax, PAGE_SIZE, 0)) { + vm_wait(NULL); + } + flags &= ~M_WAITOK; + goto retry; + } + return (NULL); + } + } + if (flags & M_ZERO) { + unsigned long x; + + for (x = 0; x != npages; x++) { + vm_page_t pgo = page + x; + + if ((pgo->flags & PG_ZERO) == 0) + pmap_zero_page(pgo); + } + } + } else { + vm_offset_t vaddr; + + vaddr = linux_alloc_kmem(flags, order); + if (vaddr == 0) + return (NULL); + + page = PHYS_TO_VM_PAGE(vtophys((void *)vaddr)); + + KASSERT(vaddr == (vm_offset_t)page_address(page), + ("Page address mismatch")); + } + + return (page); +} + +void +linux_free_pages(vm_page_t page, unsigned int order) +{ + if (PMAP_HAS_DMAP) { + unsigned long npages = 1UL << order; + unsigned long x; + + for (x = 0; x != npages; x++) { + vm_page_t pgo = page + x; + + if (vm_page_unwire_noq(pgo)) + vm_page_free(pgo); + } + } else { + vm_offset_t vaddr; + + vaddr = (vm_offset_t)page_address(page); + + linux_free_kmem(vaddr, order); + } +} + +vm_offset_t +linux_alloc_kmem(gfp_t flags, unsigned int order) +{ + size_t size = ((size_t)PAGE_SIZE) << order; + vm_offset_t addr; + + if ((flags & GFP_DMA32) == 0) { + addr = kmem_malloc(size, flags & GFP_NATIVE_MASK); + } else { + addr = kmem_alloc_contig(size, flags & GFP_NATIVE_MASK, 0, + BUS_SPACE_MAXADDR_32BIT, PAGE_SIZE, 0, VM_MEMATTR_DEFAULT); + } + return (addr); +} + +void +linux_free_kmem(vm_offset_t addr, unsigned int order) +{ + size_t size = ((size_t)PAGE_SIZE) << order; + + kmem_free(addr, size); +} + +static int +linux_get_user_pages_internal(vm_map_t map, unsigned long start, int nr_pages, + int write, struct page **pages) +{ + vm_prot_t prot; + size_t len; + int count; + + prot = write ? (VM_PROT_READ | VM_PROT_WRITE) : VM_PROT_READ; + len = ptoa((vm_offset_t)nr_pages); + count = vm_fault_quick_hold_pages(map, start, len, prot, pages, nr_pages); + return (count == -1 ? -EFAULT : nr_pages); +} + +int +__get_user_pages_fast(unsigned long start, int nr_pages, int write, + struct page **pages) +{ + vm_map_t map; + vm_page_t *mp; + vm_offset_t va; + vm_offset_t end; + vm_prot_t prot; + int count; + + if (nr_pages == 0 || in_interrupt()) + return (0); + + MPASS(pages != NULL); + map = &curthread->td_proc->p_vmspace->vm_map; + end = start + ptoa((vm_offset_t)nr_pages); + if (!vm_map_range_valid(map, start, end)) + return (-EINVAL); + prot = write ? (VM_PROT_READ | VM_PROT_WRITE) : VM_PROT_READ; + for (count = 0, mp = pages, va = start; va < end; + mp++, va += PAGE_SIZE, count++) { + *mp = pmap_extract_and_hold(map->pmap, va, prot); + if (*mp == NULL) + break; + + if ((prot & VM_PROT_WRITE) != 0 && + (*mp)->dirty != VM_PAGE_BITS_ALL) { + /* + * Explicitly dirty the physical page. Otherwise, the + * caller's changes may go unnoticed because they are + * performed through an unmanaged mapping or by a DMA + * operation. + * + * The object lock is not held here. + * See vm_page_clear_dirty_mask(). + */ + vm_page_dirty(*mp); + } + } + return (count); +} + +long +get_user_pages_remote(struct task_struct *task, struct mm_struct *mm, + unsigned long start, unsigned long nr_pages, int gup_flags, + struct page **pages, struct vm_area_struct **vmas) +{ + vm_map_t map; + + map = &task->task_thread->td_proc->p_vmspace->vm_map; + return (linux_get_user_pages_internal(map, start, nr_pages, + !!(gup_flags & FOLL_WRITE), pages)); +} + +long +get_user_pages(unsigned long start, unsigned long nr_pages, int gup_flags, + struct page **pages, struct vm_area_struct **vmas) +{ + vm_map_t map; + + map = &curthread->td_proc->p_vmspace->vm_map; + return (linux_get_user_pages_internal(map, start, nr_pages, + !!(gup_flags & FOLL_WRITE), pages)); +} + +int +is_vmalloc_addr(const void *addr) +{ + return (vtoslab((vm_offset_t)addr & ~UMA_SLAB_MASK) != NULL); +} |