diff options
Diffstat (limited to 'src/VBox/Runtime/r0drv/linux/alloc-r0drv-linux.c')
| -rw-r--r-- | src/VBox/Runtime/r0drv/linux/alloc-r0drv-linux.c | 257 |
1 files changed, 257 insertions, 0 deletions
diff --git a/src/VBox/Runtime/r0drv/linux/alloc-r0drv-linux.c b/src/VBox/Runtime/r0drv/linux/alloc-r0drv-linux.c new file mode 100644 index 00000000..47410cca --- /dev/null +++ b/src/VBox/Runtime/r0drv/linux/alloc-r0drv-linux.c @@ -0,0 +1,257 @@ +/* $Id: alloc-r0drv-linux.c $ */ +/** @file + * IPRT - Memory Allocation, Ring-0 Driver, Linux. + */ + +/* + * Copyright (C) 2006-2023 Oracle and/or its affiliates. + * + * This file is part of VirtualBox base platform packages, as + * available from https://www.virtualbox.org. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation, in version 3 of the + * License. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, see <https://www.gnu.org/licenses>. + * + * The contents of this file may alternatively be used under the terms + * of the Common Development and Distribution License Version 1.0 + * (CDDL), a copy of it is provided in the "COPYING.CDDL" file included + * in the VirtualBox distribution, in which case the provisions of the + * CDDL are applicable instead of those of the GPL. + * + * You may elect to license modified versions of this file under the + * terms and conditions of either the GPL or the CDDL or both. + * + * SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0 + */ + + +/********************************************************************************************************************************* +* Header Files * +*********************************************************************************************************************************/ +#include "the-linux-kernel.h" +#include "internal/iprt.h" +#include <iprt/mem.h> + +#include <iprt/assert.h> +#include <iprt/errcore.h> +#include "r0drv/alloc-r0drv.h" + +#include "internal/initterm.h" + + + +/** + * OS specific allocation function. + */ +DECLHIDDEN(int) rtR0MemAllocEx(size_t cb, uint32_t fFlags, PRTMEMHDR *ppHdr) +{ + PRTMEMHDR pHdr; + IPRT_LINUX_SAVE_EFL_AC(); + + /* + * Allocate. + */ + if ( +#if 1 /* vmalloc has serious performance issues, avoid it. */ + cb <= PAGE_SIZE*16 - sizeof(*pHdr) +#else + cb <= PAGE_SIZE +#endif + || (fFlags & RTMEMHDR_FLAG_ANY_CTX) + ) + { + fFlags |= RTMEMHDR_FLAG_KMALLOC; + pHdr = kmalloc(cb + sizeof(*pHdr), + fFlags & RTMEMHDR_FLAG_ANY_CTX_ALLOC ? GFP_ATOMIC | __GFP_NOWARN : GFP_KERNEL | __GFP_NOWARN); + if (RT_UNLIKELY( !pHdr + && cb > PAGE_SIZE + && !(fFlags & RTMEMHDR_FLAG_ANY_CTX) )) + { + fFlags &= ~RTMEMHDR_FLAG_KMALLOC; + pHdr = vmalloc(cb + sizeof(*pHdr)); + } + } + else + pHdr = vmalloc(cb + sizeof(*pHdr)); + if (RT_LIKELY(pHdr)) + { + /* + * Initialize. + */ + pHdr->u32Magic = RTMEMHDR_MAGIC; + pHdr->fFlags = fFlags; + pHdr->cb = cb; + pHdr->cbReq = cb; + + *ppHdr = pHdr; + IPRT_LINUX_RESTORE_EFL_AC(); + return VINF_SUCCESS; + } + + IPRT_LINUX_RESTORE_EFL_AC(); + return VERR_NO_MEMORY; +} + + +/** + * OS specific free function. + */ +DECLHIDDEN(void) rtR0MemFree(PRTMEMHDR pHdr) +{ + IPRT_LINUX_SAVE_EFL_AC(); + + pHdr->u32Magic += 1; + if (pHdr->fFlags & RTMEMHDR_FLAG_KMALLOC) + kfree(pHdr); + else + vfree(pHdr); + + IPRT_LINUX_RESTORE_EFL_AC(); +} + + + +/** + * Compute order. Some functions allocate 2^order pages. + * + * @returns order. + * @param cPages Number of pages. + */ +static int CalcPowerOf2Order(unsigned long cPages) +{ + int iOrder; + unsigned long cTmp; + + for (iOrder = 0, cTmp = cPages; cTmp >>= 1; ++iOrder) + ; + if (cPages & ~(1 << iOrder)) + ++iOrder; + + return iOrder; +} + + +/** + * Allocates physical contiguous memory (below 4GB). + * The allocation is page aligned and the content is undefined. + * + * @returns Pointer to the memory block. This is page aligned. + * @param pPhys Where to store the physical address. + * @param cb The allocation size in bytes. This is always + * rounded up to PAGE_SIZE. + */ +RTR0DECL(void *) RTMemContAlloc(PRTCCPHYS pPhys, size_t cb) +{ + int cOrder; + unsigned cPages; + struct page *paPages; + void *pvRet; + IPRT_LINUX_SAVE_EFL_AC(); + + /* + * validate input. + */ + AssertPtr(pPhys); + Assert(cb > 0); + + /* + * Allocate page pointer array. + */ + cb = RT_ALIGN_Z(cb, PAGE_SIZE); + cPages = cb >> PAGE_SHIFT; + cOrder = CalcPowerOf2Order(cPages); +#if (defined(RT_ARCH_AMD64) || defined(CONFIG_X86_PAE)) && defined(GFP_DMA32) + /* ZONE_DMA32: 0-4GB */ + paPages = alloc_pages(GFP_DMA32 | __GFP_NOWARN, cOrder); + if (!paPages) +#endif +#ifdef RT_ARCH_AMD64 + /* ZONE_DMA; 0-16MB */ + paPages = alloc_pages(GFP_DMA | __GFP_NOWARN, cOrder); +#else + /* ZONE_NORMAL: 0-896MB */ + paPages = alloc_pages(GFP_USER | __GFP_NOWARN, cOrder); +#endif + if (paPages) + { + /* + * Reserve the pages and mark them executable. + */ + unsigned iPage; + for (iPage = 0; iPage < cPages; iPage++) + { + Assert(!PageHighMem(&paPages[iPage])); + if (iPage + 1 < cPages) + { + AssertMsg( (uintptr_t)phys_to_virt(page_to_phys(&paPages[iPage])) + PAGE_SIZE + == (uintptr_t)phys_to_virt(page_to_phys(&paPages[iPage + 1])) + && page_to_phys(&paPages[iPage]) + PAGE_SIZE + == page_to_phys(&paPages[iPage + 1]), + ("iPage=%i cPages=%u [0]=%#llx,%p [1]=%#llx,%p\n", iPage, cPages, + (long long)page_to_phys(&paPages[iPage]), phys_to_virt(page_to_phys(&paPages[iPage])), + (long long)page_to_phys(&paPages[iPage + 1]), phys_to_virt(page_to_phys(&paPages[iPage + 1])) )); + } + + SetPageReserved(&paPages[iPage]); + } + *pPhys = page_to_phys(paPages); + pvRet = phys_to_virt(page_to_phys(paPages)); + } + else + pvRet = NULL; + + IPRT_LINUX_RESTORE_EFL_AC(); + return pvRet; +} +RT_EXPORT_SYMBOL(RTMemContAlloc); + + +/** + * Frees memory allocated using RTMemContAlloc(). + * + * @param pv Pointer to return from RTMemContAlloc(). + * @param cb The cb parameter passed to RTMemContAlloc(). + */ +RTR0DECL(void) RTMemContFree(void *pv, size_t cb) +{ + if (pv) + { + int cOrder; + unsigned cPages; + unsigned iPage; + struct page *paPages; + IPRT_LINUX_SAVE_EFL_AC(); + + /* validate */ + AssertMsg(!((uintptr_t)pv & PAGE_OFFSET_MASK), ("pv=%p\n", pv)); + Assert(cb > 0); + + /* calc order and get pages */ + cb = RT_ALIGN_Z(cb, PAGE_SIZE); + cPages = cb >> PAGE_SHIFT; + cOrder = CalcPowerOf2Order(cPages); + paPages = virt_to_page(pv); + + /* + * Restore page attributes freeing the pages. + */ + for (iPage = 0; iPage < cPages; iPage++) + { + ClearPageReserved(&paPages[iPage]); + } + __free_pages(paPages, cOrder); + IPRT_LINUX_RESTORE_EFL_AC(); + } +} +RT_EXPORT_SYMBOL(RTMemContFree); + |