[PATCH v8 6/6] s390/vmcore: Use vmcore for zfcpdump
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 | 122 +++--- drivers/s390/char/zcore.c | 6 +-- 4 files changed, 110 insertions(+), 22 deletions(-) diff --git a/arch/s390/Kconfig b/arch/s390/Kconfig index 22f75b5..f88bdac 100644 --- a/arch/s390/Kconfig +++ b/arch/s390/Kconfig @@ -514,6 +514,7 @@ 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 @@ -524,7 +525,7 @@ 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 3e77615..c84f33d 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))) @@ -69,22 +70,41 @@ static ssize_t copy_page_real(void *buf, void *src, size_t csize) static void *elfcorehdr_newmem; /* - * Copy one page from "oldmem" + * Copy one page from zfcpdump "oldmem" + * + * 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) +{ + int rc; + + if (src < ZFCPDUMP_HSA_SIZE) { + rc = memcpy_hsa(buf, src, csize, userbuf); + } else { + if (userbuf) + rc = copy_to_user_real((void __force __user *) buf, + (void *) src, csize); + else + rc = memcpy_real(buf, (void *) src, csize); + } + return rc ? rc : csize; +} + +/* + * Copy one page from kdump "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) +static ssize_t copy_oldmem_page_kdump(char *buf, size_t csize, + unsigned long src, int userbuf) + { - unsigned long src; int rc; - if (!csize) - return 0; - - src = (pfn << PAGE_SHIFT) + offset; if (src < OLDMEM_SIZE) src += OLDMEM_BASE; else if (src > OLDMEM_BASE && @@ -95,17 +115,35 @@ ssize_t copy_oldmem_page(unsigned long pfn, char *buf, (void *) src, csize); else rc = copy_page_real(buf, (void *) src, csize); - return (rc == 0) ? csize : rc; + return (rc == 0) ? rc : csize; } /* - * 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
[PATCH v8 6/6] s390/vmcore: Use vmcore for zfcpdump
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 holz...@linux.vnet.ibm.com --- arch/s390/Kconfig | 3 +- arch/s390/include/asm/sclp.h | 1 + arch/s390/kernel/crash_dump.c | 122 +++--- drivers/s390/char/zcore.c | 6 +-- 4 files changed, 110 insertions(+), 22 deletions(-) diff --git a/arch/s390/Kconfig b/arch/s390/Kconfig index 22f75b5..f88bdac 100644 --- a/arch/s390/Kconfig +++ b/arch/s390/Kconfig @@ -514,6 +514,7 @@ 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 @@ -524,7 +525,7 @@ 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 file:Documentation/s390/zfcpdump.txt 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 3e77615..c84f33d 100644 --- a/arch/s390/kernel/crash_dump.c +++ b/arch/s390/kernel/crash_dump.c @@ -16,6 +16,7 @@ #include asm/os_info.h #include asm/elf.h #include asm/ipl.h +#include asm/sclp.h #define PTR_ADD(x, y) (((char *) (x)) + ((unsigned long) (y))) #define PTR_SUB(x, y) (((char *) (x)) - ((unsigned long) (y))) @@ -69,22 +70,41 @@ static ssize_t copy_page_real(void *buf, void *src, size_t csize) static void *elfcorehdr_newmem; /* - * Copy one page from oldmem + * Copy one page from zfcpdump oldmem + * + * 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) +{ + int rc; + + if (src ZFCPDUMP_HSA_SIZE) { + rc = memcpy_hsa(buf, src, csize, userbuf); + } else { + if (userbuf) + rc = copy_to_user_real((void __force __user *) buf, + (void *) src, csize); + else + rc = memcpy_real(buf, (void *) src, csize); + } + return rc ? rc : csize; +} + +/* + * Copy one page from kdump 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) +static ssize_t copy_oldmem_page_kdump(char *buf, size_t csize, + unsigned long src, int userbuf) + { - unsigned long src; int rc; - if (!csize) - return 0; - - src = (pfn PAGE_SHIFT) + offset; if (src OLDMEM_SIZE) src += OLDMEM_BASE; else if (src OLDMEM_BASE @@ -95,17 +115,35 @@ ssize_t copy_oldmem_page(unsigned long pfn, char *buf, (void *) src, csize); else rc = copy_page_real(buf, (void *) src, csize); - return (rc == 0) ? csize : rc; + return (rc == 0) ? rc : csize; } /* - * 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