1 /* 2 * Copyright (c) 2015-2020 François Tigeot <ftigeot@wolfpond.org> 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice unmodified, this list of conditions, and the following 10 * disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 25 */ 26 27 #ifndef _LINUX_GFP_H_ 28 #define _LINUX_GFP_H_ 29 30 #include <linux/mmdebug.h> 31 #include <linux/mmzone.h> 32 #include <linux/stddef.h> 33 34 #include <sys/malloc.h> 35 #include <vm/vm_page.h> 36 #include <machine/bus_dma.h> 37 38 #define GFP_NOWAIT (M_NOWAIT | M_CACHEALIGN) 39 #define GFP_ATOMIC (M_NOWAIT | M_CACHEALIGN) 40 #define GFP_KERNEL (M_WAITOK | M_CACHEALIGN) 41 #define GFP_TEMPORARY GFP_KERNEL 42 #define GFP_USER GFP_KERNEL 43 #define GFP_HIGHUSER GFP_KERNEL 44 45 #define __GFP_ZERO M_ZERO 46 #define __GFP_NORETRY M_NULLOK 47 #define __GFP_RETRY_MAYFAIL M_NULLOK 48 49 #define __GFP_HIGHMEM 0u /* No particular meaning on DragonFly */ 50 #define __GFP_IO 0u /* No particular meaning on DragonFly */ 51 #define __GFP_RECLAIM 0u 52 #define __GFP_RECLAIMABLE 0u 53 #define __GFP_NOWARN 0u 54 #define __GFP_NOFAIL 0u 55 56 #define __GFP_DMA32 0x10000u /* XXX: MUST NOT collide with the M_XXX definitions */ 57 #define GFP_DMA32 __GFP_DMA32 58 59 static inline void __free_page(struct page *page) 60 { 61 vm_page_free_contig((struct vm_page *)page, PAGE_SIZE); 62 } 63 64 static inline struct page * alloc_page(int flags) 65 { 66 vm_paddr_t high = ~0LLU; 67 68 if (flags & GFP_DMA32) 69 high = BUS_SPACE_MAXADDR_32BIT; 70 71 return (struct page *)vm_page_alloc_contig(0LLU, ~0LLU, 72 PAGE_SIZE, PAGE_SIZE, PAGE_SIZE, 73 VM_MEMATTR_DEFAULT); 74 } 75 76 static inline bool 77 gfpflags_allow_blocking(const gfp_t flags) 78 { 79 return (flags & M_WAITOK); 80 } 81 82 /* 83 * Allocate multiple contiguous pages. The DragonFly code can only do 84 * multiple allocations via the free page reserve. Linux does not appear 85 * to restrict the address space, so neither do we. 86 */ 87 static inline struct page * 88 alloc_pages(gfp_t gfp_mask, unsigned int order) 89 { 90 size_t bytes = PAGE_SIZE << order; 91 struct vm_page *pgs; 92 93 pgs = vm_page_alloc_contig(0LLU, ~0LLU, bytes, bytes, bytes, 94 VM_MEMATTR_DEFAULT); 95 96 return (struct page*)pgs; 97 } 98 99 /* 100 * Free multiple contiguous pages 101 */ 102 static inline void 103 __free_pages(struct page *pgs, unsigned int order) 104 { 105 size_t bytes = PAGE_SIZE << order; 106 107 vm_page_free_contig((struct vm_page *)pgs, bytes); 108 } 109 110 #endif /* _LINUX_GFP_H_ */ 111