Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756580Ab3FGQ4N (ORCPT ); Fri, 7 Jun 2013 12:56:13 -0400 Received: from e06smtp15.uk.ibm.com ([195.75.94.111]:40334 "EHLO e06smtp15.uk.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755977Ab3FGQ4I (ORCPT ); Fri, 7 Jun 2013 12:56:08 -0400 From: Michael Holzheu To: Vivek Goyal Cc: HATAYAMA Daisuke , Jan Willeke , Martin Schwidefsky , Heiko Carstens , linux-kernel@vger.kernel.org, kexec@lists.infradead.org Subject: [PATCH v5 5/5] s390/vmcore: Use vmcore for zfcpdump Date: Fri, 7 Jun 2013 18:56:01 +0200 Message-Id: <1370624161-2298-6-git-send-email-holzheu@linux.vnet.ibm.com> X-Mailer: git-send-email 1.8.1.6 In-Reply-To: <1370624161-2298-1-git-send-email-holzheu@linux.vnet.ibm.com> References: <1370624161-2298-1-git-send-email-holzheu@linux.vnet.ibm.com> X-TM-AS-MML: No X-Content-Scanned: Fidelis XPS MAILER x-cbid: 13060716-0342-0000-0000-00000541CD1C Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 7446 Lines: 239 This patch modifies the s390 copy_oldmem_page() and remap_oldmem_pfn_range() function for zfcpdump to read from the HSA memory if memory below HSA_SIZE bytes is requested. Otherwise real memory is used. Signed-off-by: Michael Holzheu --- arch/s390/Kconfig | 3 +- arch/s390/include/asm/sclp.h | 1 + arch/s390/kernel/crash_dump.c | 113 ++++++++++++++++++++++++++++++++++++------ drivers/s390/char/zcore.c | 6 +-- 4 files changed, 103 insertions(+), 20 deletions(-) diff --git a/arch/s390/Kconfig b/arch/s390/Kconfig index 2c9789d..a0d78f1 100644 --- a/arch/s390/Kconfig +++ b/arch/s390/Kconfig @@ -516,6 +516,7 @@ config CRASH_DUMP bool "kernel crash dumps" depends on 64BIT && SMP select KEXEC + select ZFCPDUMP help Generate crash dump after being started by kexec. Crash dump kernels are loaded in the main kernel with kexec-tools @@ -526,7 +527,7 @@ config CRASH_DUMP config ZFCPDUMP def_bool n prompt "zfcpdump support" - select SMP + depends on SMP help Select this option if you want to build an zfcpdump enabled kernel. Refer to for more details on this. diff --git a/arch/s390/include/asm/sclp.h b/arch/s390/include/asm/sclp.h index 06a1361..7dc7f9c 100644 --- a/arch/s390/include/asm/sclp.h +++ b/arch/s390/include/asm/sclp.h @@ -56,5 +56,6 @@ bool sclp_has_linemode(void); bool sclp_has_vt220(void); int sclp_pci_configure(u32 fid); int sclp_pci_deconfigure(u32 fid); +int memcpy_hsa(void *dest, unsigned long src, size_t count, int mode); #endif /* _ASM_S390_SCLP_H */ diff --git a/arch/s390/kernel/crash_dump.c b/arch/s390/kernel/crash_dump.c index 12ccc3c..ee0770d 100644 --- a/arch/s390/kernel/crash_dump.c +++ b/arch/s390/kernel/crash_dump.c @@ -16,6 +16,7 @@ #include #include #include +#include #define PTR_ADD(x, y) (((char *) (x)) + ((unsigned long) (y))) #define PTR_SUB(x, y) (((char *) (x)) - ((unsigned long) (y))) @@ -27,21 +28,36 @@ static void *elfcorehdr_newmem; /* + * For pages below ZFCPDUMP_HSA_SIZE memory from the HSA is copied. Otherwise + * real memory copy is used. + */ +static ssize_t copy_oldmem_page_zfcpdump(char *buf, size_t csize, + unsigned long src, int userbuf) +{ + if (src < ZFCPDUMP_HSA_SIZE) { + if (memcpy_hsa(buf, src, csize, userbuf) < 0) + return -EINVAL; + } else { + if (userbuf) + copy_to_user_real((void __force __user *) buf, + (void *) src, csize); + else + memcpy_real(buf, (void *) src, csize); + } + return csize; +} + +/* * Copy one page from "oldmem" * * For the kdump reserved memory this functions performs a swap operation: * - [OLDMEM_BASE - OLDMEM_BASE + OLDMEM_SIZE] is mapped to [0 - OLDMEM_SIZE]. * - [0 - OLDMEM_SIZE] is mapped to [OLDMEM_BASE - OLDMEM_BASE + OLDMEM_SIZE] */ -ssize_t copy_oldmem_page(unsigned long pfn, char *buf, - size_t csize, unsigned long offset, int userbuf) -{ - unsigned long src; +static ssize_t copy_oldmem_page_kdump(char *buf, size_t csize, + unsigned long src, int userbuf) - if (!csize) - return 0; - - src = (pfn << PAGE_SHIFT) + offset; +{ if (src < OLDMEM_SIZE) src += OLDMEM_BASE; else if (src > OLDMEM_BASE && @@ -56,13 +72,31 @@ ssize_t copy_oldmem_page(unsigned long pfn, char *buf, } /* - * Remap "oldmem" + * Copy one page from "oldmem" + */ +ssize_t copy_oldmem_page(unsigned long pfn, char *buf, size_t csize, + unsigned long offset, int userbuf) +{ + unsigned long src; + if (!csize) + return 0; + src = (pfn << PAGE_SHIFT) + offset; + + if (OLDMEM_BASE) + return copy_oldmem_page_kdump(buf, csize, src, userbuf); + else + return copy_oldmem_page_zfcpdump(buf, csize, src, userbuf); +} + +/* + * Remap "oldmem" for kdump * * For the kdump reserved memory this functions performs a swap operation: * [0 - OLDMEM_SIZE] is mapped to [OLDMEM_BASE - OLDMEM_BASE + OLDMEM_SIZE] */ -int remap_oldmem_pfn_range(struct vm_area_struct *vma, unsigned long from, - unsigned long pfn, unsigned long size, pgprot_t prot) +static int remap_oldmem_pfn_range_kdump(struct vm_area_struct *vma, + unsigned long from, unsigned long pfn, + unsigned long size, pgprot_t prot) { unsigned long size_old; int rc; @@ -82,6 +116,43 @@ int remap_oldmem_pfn_range(struct vm_area_struct *vma, unsigned long from, } /* + * Remap "oldmem" for zfcpdump + * + * We only map available memory above ZFCPDUMP_HSA_SIZE. Memory below + * ZFCPDUMP_HSA_SIZE is read on demand using the copy_oldmem_page() function. + */ +static int remap_oldmem_pfn_range_zfcpdump(struct vm_area_struct *vma, + unsigned long from, + unsigned long pfn, + unsigned long size, pgprot_t prot) +{ + unsigned long size_hsa; + + if (pfn < ZFCPDUMP_HSA_SIZE >> PAGE_SHIFT) { + size_hsa = min(size, OLDMEM_SIZE - (pfn << PAGE_SHIFT)); + if (size == size_hsa) + return 0; + size -= size_hsa; + from += size_hsa; + pfn += size_hsa >> PAGE_SHIFT; + } + return remap_pfn_range(vma, from, pfn, size, prot); +} + +/* + * Remap "oldmem" for kdump or zfcpdump + */ +int remap_oldmem_pfn_range(struct vm_area_struct *vma, unsigned long from, + unsigned long pfn, unsigned long size, pgprot_t prot) +{ + if (OLDMEM_BASE) + return remap_oldmem_pfn_range_kdump(vma, from, pfn, size, prot); + else + return remap_oldmem_pfn_range_zfcpdump(vma, from, pfn, size, + prot); +} + +/* * Copy memory from old kernel */ int copy_from_oldmem(void *dest, void *src, size_t count) @@ -89,11 +160,21 @@ int copy_from_oldmem(void *dest, void *src, size_t count) unsigned long copied = 0; int rc; - if ((unsigned long) src < OLDMEM_SIZE) { - copied = min(count, OLDMEM_SIZE - (unsigned long) src); - rc = memcpy_real(dest, src + OLDMEM_BASE, copied); - if (rc) - return rc; + if (OLDMEM_BASE) { + if ((unsigned long) src < OLDMEM_SIZE) { + copied = min(count, OLDMEM_SIZE - (unsigned long) src); + rc = memcpy_real(dest, src + OLDMEM_BASE, copied); + if (rc) + return rc; + } + } else { + if ((unsigned long) src < ZFCPDUMP_HSA_SIZE) { + copied = min(count, + ZFCPDUMP_HSA_SIZE - (unsigned long) src); + rc = memcpy_hsa(dest, (unsigned long) src, copied, 0); + if (rc) + return rc; + } } return memcpy_real(dest + copied, src + copied, count - copied); } diff --git a/drivers/s390/char/zcore.c b/drivers/s390/char/zcore.c index 9e5e146..794820a 100644 --- a/drivers/s390/char/zcore.c +++ b/drivers/s390/char/zcore.c @@ -30,8 +30,8 @@ #define TRACE(x...) debug_sprintf_event(zcore_dbf, 1, x) -#define TO_USER 0 -#define TO_KERNEL 1 +#define TO_USER 1 +#define TO_KERNEL 0 #define CHUNK_INFO_SIZE 34 /* 2 16-byte char, each followed by blank */ enum arch_id { @@ -73,7 +73,7 @@ static struct ipl_parameter_block *ipl_block; * @count: Size of buffer, which should be copied * @mode: Either TO_KERNEL or TO_USER */ -static int memcpy_hsa(void *dest, unsigned long src, size_t count, int mode) +int memcpy_hsa(void *dest, unsigned long src, size_t count, int mode) { int offs, blk_num; static char buf[PAGE_SIZE] __attribute__((__aligned__(PAGE_SIZE))); -- 1.8.1.6 -- 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/