Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752543AbbHPUuD (ORCPT ); Sun, 16 Aug 2015 16:50:03 -0400 Received: from mx1.redhat.com ([209.132.183.28]:45419 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752127AbbHPUth (ORCPT ); Sun, 16 Aug 2015 16:49:37 -0400 From: Mark Salter To: Catalin Marinas , Will Deacon , x86@kernel.org Cc: Andrew Morton , Arnd Bergmann , Ard Biesheuvel , Mark Rutland , linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-mm@kvack.org, linux-arch@vger.kernel.org, Mark Salter Subject: [PATCH V3 2/3] arm64: support initrd outside kernel linear map Date: Sun, 16 Aug 2015 16:49:27 -0400 Message-Id: <1439758168-29427-3-git-send-email-msalter@redhat.com> In-Reply-To: <1439758168-29427-1-git-send-email-msalter@redhat.com> References: <1439758168-29427-1-git-send-email-msalter@redhat.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2818 Lines: 96 The use of mem= could leave part or all of the initrd outside of the kernel linear map. This will lead to an error when unpacking the initrd and a probable failure to boot. This patch catches that situation and relocates the initrd to be fully within the linear map. Signed-off-by: Mark Salter --- arch/arm64/kernel/setup.c | 59 +++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 59 insertions(+) diff --git a/arch/arm64/kernel/setup.c b/arch/arm64/kernel/setup.c index f3067d4..5f45fd9 100644 --- a/arch/arm64/kernel/setup.c +++ b/arch/arm64/kernel/setup.c @@ -359,6 +359,64 @@ static void __init request_standard_resources(void) } } +#ifdef CONFIG_BLK_DEV_INITRD +/* + * Relocate initrd if it is not completely within the linear mapping. + * This would be the case if mem= cuts out all or part of it. + */ +static void __init relocate_initrd(void) +{ + phys_addr_t orig_start = __virt_to_phys(initrd_start); + phys_addr_t orig_end = __virt_to_phys(initrd_end); + phys_addr_t ram_end = memblock_end_of_DRAM(); + phys_addr_t new_start; + unsigned long size, to_free = 0; + void *dest; + + if (orig_end <= ram_end) + return; + + /* Note if any of original initrd will freeing below */ + if (orig_start < ram_end) + to_free = ram_end - orig_start; + + size = orig_end - orig_start; + + /* initrd needs to be relocated completely inside linear mapping */ + new_start = memblock_find_in_range(0, PFN_PHYS(max_pfn), + size, PAGE_SIZE); + if (!new_start) + panic("Cannot relocate initrd of size %ld\n", size); + memblock_reserve(new_start, size); + + initrd_start = __phys_to_virt(new_start); + initrd_end = initrd_start + size; + + pr_info("Moving initrd from [%llx-%llx] to [%llx-%llx]\n", + orig_start, orig_start + size - 1, + new_start, new_start + size - 1); + + dest = (void *)initrd_start; + + if (to_free) { + memcpy(dest, (void *)__phys_to_virt(orig_start), to_free); + dest += to_free; + } + + copy_from_early_mem(dest, orig_start + to_free, size - to_free); + + if (to_free) { + pr_info("Freeing original RAMDISK from [%llx-%llx]\n", + orig_start, orig_start + to_free - 1); + memblock_free(orig_start, to_free); + } +} +#else +static inline void __init reserve_initrd(void) +{ +} +#endif + u64 __cpu_logical_map[NR_CPUS] = { [0 ... NR_CPUS-1] = INVALID_HWID }; void __init setup_arch(char **cmdline_p) @@ -392,6 +450,7 @@ void __init setup_arch(char **cmdline_p) acpi_boot_table_init(); paging_init(); + relocate_initrd(); request_standard_resources(); early_ioremap_reset(); -- 2.4.3 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/