| 1 | /* $Id: alloc-r0drv-linux.c 98103 2023-01-17 14:15:46Z vboxsync $ */
|
|---|
| 2 | /** @file
|
|---|
| 3 | * IPRT - Memory Allocation, Ring-0 Driver, Linux.
|
|---|
| 4 | */
|
|---|
| 5 |
|
|---|
| 6 | /*
|
|---|
| 7 | * Copyright (C) 2006-2023 Oracle and/or its affiliates.
|
|---|
| 8 | *
|
|---|
| 9 | * This file is part of VirtualBox base platform packages, as
|
|---|
| 10 | * available from https://www.virtualbox.org.
|
|---|
| 11 | *
|
|---|
| 12 | * This program is free software; you can redistribute it and/or
|
|---|
| 13 | * modify it under the terms of the GNU General Public License
|
|---|
| 14 | * as published by the Free Software Foundation, in version 3 of the
|
|---|
| 15 | * License.
|
|---|
| 16 | *
|
|---|
| 17 | * This program is distributed in the hope that it will be useful, but
|
|---|
| 18 | * WITHOUT ANY WARRANTY; without even the implied warranty of
|
|---|
| 19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|---|
| 20 | * General Public License for more details.
|
|---|
| 21 | *
|
|---|
| 22 | * You should have received a copy of the GNU General Public License
|
|---|
| 23 | * along with this program; if not, see <https://www.gnu.org/licenses>.
|
|---|
| 24 | *
|
|---|
| 25 | * The contents of this file may alternatively be used under the terms
|
|---|
| 26 | * of the Common Development and Distribution License Version 1.0
|
|---|
| 27 | * (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
|
|---|
| 28 | * in the VirtualBox distribution, in which case the provisions of the
|
|---|
| 29 | * CDDL are applicable instead of those of the GPL.
|
|---|
| 30 | *
|
|---|
| 31 | * You may elect to license modified versions of this file under the
|
|---|
| 32 | * terms and conditions of either the GPL or the CDDL or both.
|
|---|
| 33 | *
|
|---|
| 34 | * SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
|
|---|
| 35 | */
|
|---|
| 36 |
|
|---|
| 37 |
|
|---|
| 38 | /*********************************************************************************************************************************
|
|---|
| 39 | * Header Files *
|
|---|
| 40 | *********************************************************************************************************************************/
|
|---|
| 41 | #include "the-linux-kernel.h"
|
|---|
| 42 | #include "internal/iprt.h"
|
|---|
| 43 | #include <iprt/mem.h>
|
|---|
| 44 |
|
|---|
| 45 | #include <iprt/assert.h>
|
|---|
| 46 | #include <iprt/errcore.h>
|
|---|
| 47 | #include "r0drv/alloc-r0drv.h"
|
|---|
| 48 |
|
|---|
| 49 | #include "internal/initterm.h"
|
|---|
| 50 |
|
|---|
| 51 |
|
|---|
| 52 |
|
|---|
| 53 | /**
|
|---|
| 54 | * OS specific allocation function.
|
|---|
| 55 | */
|
|---|
| 56 | DECLHIDDEN(int) rtR0MemAllocEx(size_t cb, uint32_t fFlags, PRTMEMHDR *ppHdr)
|
|---|
| 57 | {
|
|---|
| 58 | PRTMEMHDR pHdr;
|
|---|
| 59 | IPRT_LINUX_SAVE_EFL_AC();
|
|---|
| 60 |
|
|---|
| 61 | /*
|
|---|
| 62 | * Allocate.
|
|---|
| 63 | */
|
|---|
| 64 | if (
|
|---|
| 65 | #if 1 /* vmalloc has serious performance issues, avoid it. */
|
|---|
| 66 | cb <= PAGE_SIZE*16 - sizeof(*pHdr)
|
|---|
| 67 | #else
|
|---|
| 68 | cb <= PAGE_SIZE
|
|---|
| 69 | #endif
|
|---|
| 70 | || (fFlags & RTMEMHDR_FLAG_ANY_CTX)
|
|---|
| 71 | )
|
|---|
| 72 | {
|
|---|
| 73 | fFlags |= RTMEMHDR_FLAG_KMALLOC;
|
|---|
| 74 | pHdr = kmalloc(cb + sizeof(*pHdr),
|
|---|
| 75 | fFlags & RTMEMHDR_FLAG_ANY_CTX_ALLOC ? GFP_ATOMIC | __GFP_NOWARN : GFP_KERNEL | __GFP_NOWARN);
|
|---|
| 76 | if (RT_UNLIKELY( !pHdr
|
|---|
| 77 | && cb > PAGE_SIZE
|
|---|
| 78 | && !(fFlags & RTMEMHDR_FLAG_ANY_CTX) ))
|
|---|
| 79 | {
|
|---|
| 80 | fFlags &= ~RTMEMHDR_FLAG_KMALLOC;
|
|---|
| 81 | pHdr = vmalloc(cb + sizeof(*pHdr));
|
|---|
| 82 | }
|
|---|
| 83 | }
|
|---|
| 84 | else
|
|---|
| 85 | pHdr = vmalloc(cb + sizeof(*pHdr));
|
|---|
| 86 | if (RT_LIKELY(pHdr))
|
|---|
| 87 | {
|
|---|
| 88 | /*
|
|---|
| 89 | * Initialize.
|
|---|
| 90 | */
|
|---|
| 91 | pHdr->u32Magic = RTMEMHDR_MAGIC;
|
|---|
| 92 | pHdr->fFlags = fFlags;
|
|---|
| 93 | pHdr->cb = cb;
|
|---|
| 94 | pHdr->cbReq = cb;
|
|---|
| 95 |
|
|---|
| 96 | *ppHdr = pHdr;
|
|---|
| 97 | IPRT_LINUX_RESTORE_EFL_AC();
|
|---|
| 98 | return VINF_SUCCESS;
|
|---|
| 99 | }
|
|---|
| 100 |
|
|---|
| 101 | IPRT_LINUX_RESTORE_EFL_AC();
|
|---|
| 102 | return VERR_NO_MEMORY;
|
|---|
| 103 | }
|
|---|
| 104 |
|
|---|
| 105 |
|
|---|
| 106 | /**
|
|---|
| 107 | * OS specific free function.
|
|---|
| 108 | */
|
|---|
| 109 | DECLHIDDEN(void) rtR0MemFree(PRTMEMHDR pHdr)
|
|---|
| 110 | {
|
|---|
| 111 | IPRT_LINUX_SAVE_EFL_AC();
|
|---|
| 112 |
|
|---|
| 113 | pHdr->u32Magic += 1;
|
|---|
| 114 | if (pHdr->fFlags & RTMEMHDR_FLAG_KMALLOC)
|
|---|
| 115 | kfree(pHdr);
|
|---|
| 116 | else
|
|---|
| 117 | vfree(pHdr);
|
|---|
| 118 |
|
|---|
| 119 | IPRT_LINUX_RESTORE_EFL_AC();
|
|---|
| 120 | }
|
|---|
| 121 |
|
|---|
| 122 |
|
|---|
| 123 |
|
|---|
| 124 | /**
|
|---|
| 125 | * Compute order. Some functions allocate 2^order pages.
|
|---|
| 126 | *
|
|---|
| 127 | * @returns order.
|
|---|
| 128 | * @param cPages Number of pages.
|
|---|
| 129 | */
|
|---|
| 130 | static int CalcPowerOf2Order(unsigned long cPages)
|
|---|
| 131 | {
|
|---|
| 132 | int iOrder;
|
|---|
| 133 | unsigned long cTmp;
|
|---|
| 134 |
|
|---|
| 135 | for (iOrder = 0, cTmp = cPages; cTmp >>= 1; ++iOrder)
|
|---|
| 136 | ;
|
|---|
| 137 | if (cPages & ~(1 << iOrder))
|
|---|
| 138 | ++iOrder;
|
|---|
| 139 |
|
|---|
| 140 | return iOrder;
|
|---|
| 141 | }
|
|---|
| 142 |
|
|---|
| 143 |
|
|---|
| 144 | /**
|
|---|
| 145 | * Allocates physical contiguous memory (below 4GB).
|
|---|
| 146 | * The allocation is page aligned and the content is undefined.
|
|---|
| 147 | *
|
|---|
| 148 | * @returns Pointer to the memory block. This is page aligned.
|
|---|
| 149 | * @param pPhys Where to store the physical address.
|
|---|
| 150 | * @param cb The allocation size in bytes. This is always
|
|---|
| 151 | * rounded up to PAGE_SIZE.
|
|---|
| 152 | */
|
|---|
| 153 | RTR0DECL(void *) RTMemContAlloc(PRTCCPHYS pPhys, size_t cb)
|
|---|
| 154 | {
|
|---|
| 155 | int cOrder;
|
|---|
| 156 | unsigned cPages;
|
|---|
| 157 | struct page *paPages;
|
|---|
| 158 | void *pvRet;
|
|---|
| 159 | IPRT_LINUX_SAVE_EFL_AC();
|
|---|
| 160 |
|
|---|
| 161 | /*
|
|---|
| 162 | * validate input.
|
|---|
| 163 | */
|
|---|
| 164 | AssertPtr(pPhys);
|
|---|
| 165 | Assert(cb > 0);
|
|---|
| 166 |
|
|---|
| 167 | /*
|
|---|
| 168 | * Allocate page pointer array.
|
|---|
| 169 | */
|
|---|
| 170 | cb = RT_ALIGN_Z(cb, PAGE_SIZE);
|
|---|
| 171 | cPages = cb >> PAGE_SHIFT;
|
|---|
| 172 | cOrder = CalcPowerOf2Order(cPages);
|
|---|
| 173 | #if (defined(RT_ARCH_AMD64) || defined(CONFIG_X86_PAE)) && defined(GFP_DMA32)
|
|---|
| 174 | /* ZONE_DMA32: 0-4GB */
|
|---|
| 175 | paPages = alloc_pages(GFP_DMA32 | __GFP_NOWARN, cOrder);
|
|---|
| 176 | if (!paPages)
|
|---|
| 177 | #endif
|
|---|
| 178 | #ifdef RT_ARCH_AMD64
|
|---|
| 179 | /* ZONE_DMA; 0-16MB */
|
|---|
| 180 | paPages = alloc_pages(GFP_DMA | __GFP_NOWARN, cOrder);
|
|---|
| 181 | #else
|
|---|
| 182 | /* ZONE_NORMAL: 0-896MB */
|
|---|
| 183 | paPages = alloc_pages(GFP_USER | __GFP_NOWARN, cOrder);
|
|---|
| 184 | #endif
|
|---|
| 185 | if (paPages)
|
|---|
| 186 | {
|
|---|
| 187 | /*
|
|---|
| 188 | * Reserve the pages and mark them executable.
|
|---|
| 189 | */
|
|---|
| 190 | unsigned iPage;
|
|---|
| 191 | for (iPage = 0; iPage < cPages; iPage++)
|
|---|
| 192 | {
|
|---|
| 193 | Assert(!PageHighMem(&paPages[iPage]));
|
|---|
| 194 | if (iPage + 1 < cPages)
|
|---|
| 195 | {
|
|---|
| 196 | AssertMsg( (uintptr_t)phys_to_virt(page_to_phys(&paPages[iPage])) + PAGE_SIZE
|
|---|
| 197 | == (uintptr_t)phys_to_virt(page_to_phys(&paPages[iPage + 1]))
|
|---|
| 198 | && page_to_phys(&paPages[iPage]) + PAGE_SIZE
|
|---|
| 199 | == page_to_phys(&paPages[iPage + 1]),
|
|---|
| 200 | ("iPage=%i cPages=%u [0]=%#llx,%p [1]=%#llx,%p\n", iPage, cPages,
|
|---|
| 201 | (long long)page_to_phys(&paPages[iPage]), phys_to_virt(page_to_phys(&paPages[iPage])),
|
|---|
| 202 | (long long)page_to_phys(&paPages[iPage + 1]), phys_to_virt(page_to_phys(&paPages[iPage + 1])) ));
|
|---|
| 203 | }
|
|---|
| 204 |
|
|---|
| 205 | SetPageReserved(&paPages[iPage]);
|
|---|
| 206 | }
|
|---|
| 207 | *pPhys = page_to_phys(paPages);
|
|---|
| 208 | pvRet = phys_to_virt(page_to_phys(paPages));
|
|---|
| 209 | }
|
|---|
| 210 | else
|
|---|
| 211 | pvRet = NULL;
|
|---|
| 212 |
|
|---|
| 213 | IPRT_LINUX_RESTORE_EFL_AC();
|
|---|
| 214 | return pvRet;
|
|---|
| 215 | }
|
|---|
| 216 | RT_EXPORT_SYMBOL(RTMemContAlloc);
|
|---|
| 217 |
|
|---|
| 218 |
|
|---|
| 219 | /**
|
|---|
| 220 | * Frees memory allocated using RTMemContAlloc().
|
|---|
| 221 | *
|
|---|
| 222 | * @param pv Pointer to return from RTMemContAlloc().
|
|---|
| 223 | * @param cb The cb parameter passed to RTMemContAlloc().
|
|---|
| 224 | */
|
|---|
| 225 | RTR0DECL(void) RTMemContFree(void *pv, size_t cb)
|
|---|
| 226 | {
|
|---|
| 227 | if (pv)
|
|---|
| 228 | {
|
|---|
| 229 | int cOrder;
|
|---|
| 230 | unsigned cPages;
|
|---|
| 231 | unsigned iPage;
|
|---|
| 232 | struct page *paPages;
|
|---|
| 233 | IPRT_LINUX_SAVE_EFL_AC();
|
|---|
| 234 |
|
|---|
| 235 | /* validate */
|
|---|
| 236 | AssertMsg(!((uintptr_t)pv & PAGE_OFFSET_MASK), ("pv=%p\n", pv));
|
|---|
| 237 | Assert(cb > 0);
|
|---|
| 238 |
|
|---|
| 239 | /* calc order and get pages */
|
|---|
| 240 | cb = RT_ALIGN_Z(cb, PAGE_SIZE);
|
|---|
| 241 | cPages = cb >> PAGE_SHIFT;
|
|---|
| 242 | cOrder = CalcPowerOf2Order(cPages);
|
|---|
| 243 | paPages = virt_to_page(pv);
|
|---|
| 244 |
|
|---|
| 245 | /*
|
|---|
| 246 | * Restore page attributes freeing the pages.
|
|---|
| 247 | */
|
|---|
| 248 | for (iPage = 0; iPage < cPages; iPage++)
|
|---|
| 249 | {
|
|---|
| 250 | ClearPageReserved(&paPages[iPage]);
|
|---|
| 251 | }
|
|---|
| 252 | __free_pages(paPages, cOrder);
|
|---|
| 253 | IPRT_LINUX_RESTORE_EFL_AC();
|
|---|
| 254 | }
|
|---|
| 255 | }
|
|---|
| 256 | RT_EXPORT_SYMBOL(RTMemContFree);
|
|---|
| 257 |
|
|---|
