From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from e28smtp03.in.ibm.com (e28smtp03.in.ibm.com [122.248.162.3]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (Client CN "e28smtp03.in.ibm.com", Issuer "GeoTrust SSL CA" (not verified)) by ozlabs.org (Postfix) with ESMTPS id DDBE0B6FBA for ; Thu, 16 Feb 2012 22:16:25 +1100 (EST) Received: from /spool/local by e28smtp03.in.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted for from ; Thu, 16 Feb 2012 16:46:23 +0530 Received: from d28av01.in.ibm.com (d28av01.in.ibm.com [9.184.220.63]) by d28relay01.in.ibm.com (8.13.8/8.13.8/NCO v10.0) with ESMTP id q1GBFkks4006046 for ; Thu, 16 Feb 2012 16:45:46 +0530 Received: from d28av01.in.ibm.com (loopback [127.0.0.1]) by d28av01.in.ibm.com (8.14.4/8.13.1/NCO v10.0 AVout) with ESMTP id q1GBFiKp014659 for ; Thu, 16 Feb 2012 16:45:45 +0530 Subject: [RFC PATCH v7 06/10] fadump: Add PT_NOTE program header for vmcoreinfo To: linuxppc-dev , Linux Kernel , Benjamin Herrenschmidt From: Mahesh J Salgaonkar Date: Thu, 16 Feb 2012 16:44:53 +0530 Message-ID: <20120216111452.4733.91579.stgit@mars> In-Reply-To: <20120216111050.4733.38034.stgit@mars> References: <20120216111050.4733.38034.stgit@mars> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Cc: Anton Blanchard , Amerigo Wang , Kexec-ml , Milton Miller , Randy Dunlap , Paul Mackerras , "Eric W. Biederman" , Vivek Goyal List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , From: Mahesh Salgaonkar Introduce a PT_NOTE program header that points to physical address of vmcoreinfo_note buffer declared in kernel/kexec.c. The vmcoreinfo note buffer is populated during crash_fadump() at the time of system crash. Signed-off-by: Mahesh Salgaonkar --- arch/powerpc/kernel/fadump.c | 29 +++++++++++++++++++++++++++++ 1 files changed, 29 insertions(+), 0 deletions(-) diff --git a/arch/powerpc/kernel/fadump.c b/arch/powerpc/kernel/fadump.c index cab56e7..5689954 100644 --- a/arch/powerpc/kernel/fadump.c +++ b/arch/powerpc/kernel/fadump.c @@ -814,6 +814,19 @@ static void fadump_setup_crash_memory_ranges(void) } } +/* + * If the given physical address falls within the boot memory region then + * return the relocated address that points to the dump region reserved + * for saving initial boot memory contents. + */ +static inline unsigned long fadump_relocate(unsigned long paddr) +{ + if (paddr > RMA_START && paddr < fw_dump.boot_memory_size) + return fdm.rmr_region.destination_address + paddr; + else + return paddr; +} + static int fadump_create_elfcore_headers(char *bufp) { struct elfhdr *elf; @@ -845,6 +858,22 @@ static int fadump_create_elfcore_headers(char *bufp) (elf->e_phnum)++; + /* setup ELF PT_NOTE for vmcoreinfo */ + phdr = (struct elf_phdr *)bufp; + bufp += sizeof(struct elf_phdr); + phdr->p_type = PT_NOTE; + phdr->p_flags = 0; + phdr->p_vaddr = 0; + phdr->p_align = 0; + + phdr->p_paddr = fadump_relocate(paddr_vmcoreinfo_note()); + phdr->p_offset = phdr->p_paddr; + phdr->p_memsz = vmcoreinfo_max_size; + phdr->p_filesz = vmcoreinfo_max_size; + + /* Increment number of program headers. */ + (elf->e_phnum)++; + /* setup PT_LOAD sections. */ for (i = 0; i < crash_mem_ranges; i++) {