Re: [PATCH] [ppc] Do not reserve cpu spin-table for crash kernel
On Thu, May 24, 2012 at 11:39:45AM +0530, Suzuki K. Poulose wrote: As of now, the kexec reserves the spin-table for all the CPUs on an SMP machine. The spin-table is pointed to by the cpu-release-addr property in the device-tree. Reserving the spin-table in the crash kernel will cause a BUG(), if the table lies outside the memory reserved for the crashkernel. Disable reserving the spin-table regions and use maxcpus=1 to use only the crashing CPU to boot the crash kernel. Signed-off-by: Suzuki K. Poulose suz...@in.ibm.com Thanks, applied. Sorry for not seeing this (much) earlier. ___ Linuxppc-dev mailing list Linuxppc-dev@lists.ozlabs.org https://lists.ozlabs.org/listinfo/linuxppc-dev
Re: [PATCH] [ppc] Do not reserve cpu spin-table for crash kernel
On 05/24/2012 11:39 AM, Suzuki K. Poulose wrote: As of now, the kexec reserves the spin-table for all the CPUs on an SMP machine. The spin-table is pointed to by the cpu-release-addr property in the device-tree. Reserving the spin-table in the crash kernel will cause a BUG(), if the table lies outside the memory reserved for the crashkernel. Disable reserving the spin-table regions and use maxcpus=1 to use only the crashing CPU to boot the crash kernel. Signed-off-by: Suzuki K. Poulosesuz...@in.ibm.com Simon, Any response on this one ? I have tested this on a Currituck board (476, SMP) with a UP kernel. Without this patch, the secondary kernel hits 'PANIC' in boot while trying to reserve a memory(the spin table), outside the memory range(crash reserve). Thanks Suzuki --- kexec/arch/ppc/crashdump-powerpc.c | 19 +-- kexec/arch/ppc/fixup_dtb.c |4 2 files changed, 17 insertions(+), 6 deletions(-) diff --git a/kexec/arch/ppc/crashdump-powerpc.c b/kexec/arch/ppc/crashdump-powerpc.c index 1bef69b..4c8c75d 100644 --- a/kexec/arch/ppc/crashdump-powerpc.c +++ b/kexec/arch/ppc/crashdump-powerpc.c @@ -262,10 +262,19 @@ static void ulltoa(unsigned long long i, char *str) } } +/* Append str to cmdline */ +static void add_cmdline(char *cmdline, char *str) +{ + int cmdlen = strlen(cmdline) + strlen(str); + if (cmdlen (COMMAND_LINE_SIZE - 1)) + die(Command line overflow\n); + strcat(cmdline, str); +} + static int add_cmdline_param(char *cmdline, unsigned long long addr, char *cmdstr, char *byte) { - int cmdlen, len, align = 1024; + int align = 1024; char str[COMMAND_LINE_SIZE], *ptr; /* Passing in =xxxK / =xxxM format. Saves space required in cmdline.*/ @@ -284,11 +293,8 @@ static int add_cmdline_param(char *cmdline, unsigned long long addr, ptr += strlen(str); ulltoa(addr, ptr); strcat(str, byte); - len = strlen(str); - cmdlen = strlen(cmdline) + len; - if (cmdlen (COMMAND_LINE_SIZE - 1)) - die(Command line overflow\n); - strcat(cmdline, str); + + add_cmdline(cmdline, str); dbgprintf(Command line after adding elfcorehdr: %s\n, cmdline); @@ -365,6 +371,7 @@ int load_crashdump_segments(struct kexec_info *info, char *mod_cmdline, */ add_cmdline_param(mod_cmdline, elfcorehdr, elfcorehdr=, K); add_cmdline_param(mod_cmdline, saved_max_mem, savemaxmem=, M); + add_cmdline(mod_cmdline, maxcpus=1); return 0; } diff --git a/kexec/arch/ppc/fixup_dtb.c b/kexec/arch/ppc/fixup_dtb.c index e9890a4..f832026 100644 --- a/kexec/arch/ppc/fixup_dtb.c +++ b/kexec/arch/ppc/fixup_dtb.c @@ -172,6 +172,9 @@ static void fixup_reserve_regions(struct kexec_info *info, char *blob_buf) } } +#if 0 + /* XXX: Do not reserve spin-table for CPUs. */ + /* Add reserve regions for cpu-release-addr */ nodeoffset = fdt_node_offset_by_prop_value(blob_buf, -1, device_type, cpu, 4); while (nodeoffset != -FDT_ERR_NOTFOUND) { @@ -201,6 +204,7 @@ static void fixup_reserve_regions(struct kexec_info *info, char *blob_buf) nodeoffset = fdt_node_offset_by_prop_value(blob_buf, nodeoffset, device_type, cpu, 4); } +#endif out: print_fdt_reserve_regions(blob_buf); ___ kexec mailing list ke...@lists.infradead.org http://lists.infradead.org/mailman/listinfo/kexec ___ Linuxppc-dev mailing list Linuxppc-dev@lists.ozlabs.org https://lists.ozlabs.org/listinfo/linuxppc-dev
[PATCH] [ppc] Do not reserve cpu spin-table for crash kernel
As of now, the kexec reserves the spin-table for all the CPUs on an SMP machine. The spin-table is pointed to by the cpu-release-addr property in the device-tree. Reserving the spin-table in the crash kernel will cause a BUG(), if the table lies outside the memory reserved for the crashkernel. Disable reserving the spin-table regions and use maxcpus=1 to use only the crashing CPU to boot the crash kernel. Signed-off-by: Suzuki K. Poulose suz...@in.ibm.com --- kexec/arch/ppc/crashdump-powerpc.c | 19 +-- kexec/arch/ppc/fixup_dtb.c |4 2 files changed, 17 insertions(+), 6 deletions(-) diff --git a/kexec/arch/ppc/crashdump-powerpc.c b/kexec/arch/ppc/crashdump-powerpc.c index 1bef69b..4c8c75d 100644 --- a/kexec/arch/ppc/crashdump-powerpc.c +++ b/kexec/arch/ppc/crashdump-powerpc.c @@ -262,10 +262,19 @@ static void ulltoa(unsigned long long i, char *str) } } +/* Append str to cmdline */ +static void add_cmdline(char *cmdline, char *str) +{ + int cmdlen = strlen(cmdline) + strlen(str); + if (cmdlen (COMMAND_LINE_SIZE - 1)) + die(Command line overflow\n); + strcat(cmdline, str); +} + static int add_cmdline_param(char *cmdline, unsigned long long addr, char *cmdstr, char *byte) { - int cmdlen, len, align = 1024; + int align = 1024; char str[COMMAND_LINE_SIZE], *ptr; /* Passing in =xxxK / =xxxM format. Saves space required in cmdline.*/ @@ -284,11 +293,8 @@ static int add_cmdline_param(char *cmdline, unsigned long long addr, ptr += strlen(str); ulltoa(addr, ptr); strcat(str, byte); - len = strlen(str); - cmdlen = strlen(cmdline) + len; - if (cmdlen (COMMAND_LINE_SIZE - 1)) - die(Command line overflow\n); - strcat(cmdline, str); + + add_cmdline(cmdline, str); dbgprintf(Command line after adding elfcorehdr: %s\n, cmdline); @@ -365,6 +371,7 @@ int load_crashdump_segments(struct kexec_info *info, char *mod_cmdline, */ add_cmdline_param(mod_cmdline, elfcorehdr, elfcorehdr=, K); add_cmdline_param(mod_cmdline, saved_max_mem, savemaxmem=, M); + add_cmdline(mod_cmdline, maxcpus=1); return 0; } diff --git a/kexec/arch/ppc/fixup_dtb.c b/kexec/arch/ppc/fixup_dtb.c index e9890a4..f832026 100644 --- a/kexec/arch/ppc/fixup_dtb.c +++ b/kexec/arch/ppc/fixup_dtb.c @@ -172,6 +172,9 @@ static void fixup_reserve_regions(struct kexec_info *info, char *blob_buf) } } +#if 0 + /* XXX: Do not reserve spin-table for CPUs. */ + /* Add reserve regions for cpu-release-addr */ nodeoffset = fdt_node_offset_by_prop_value(blob_buf, -1, device_type, cpu, 4); while (nodeoffset != -FDT_ERR_NOTFOUND) { @@ -201,6 +204,7 @@ static void fixup_reserve_regions(struct kexec_info *info, char *blob_buf) nodeoffset = fdt_node_offset_by_prop_value(blob_buf, nodeoffset, device_type, cpu, 4); } +#endif out: print_fdt_reserve_regions(blob_buf); ___ Linuxppc-dev mailing list Linuxppc-dev@lists.ozlabs.org https://lists.ozlabs.org/listinfo/linuxppc-dev