diff options
Diffstat (limited to 'target/linux/generic/patches-2.6.30/029-mips_kexec.patch')
| -rw-r--r-- | target/linux/generic/patches-2.6.30/029-mips_kexec.patch | 608 |
1 files changed, 608 insertions, 0 deletions
diff --git a/target/linux/generic/patches-2.6.30/029-mips_kexec.patch b/target/linux/generic/patches-2.6.30/029-mips_kexec.patch new file mode 100644 index 0000000000..0eebacfa3f --- /dev/null +++ b/target/linux/generic/patches-2.6.30/029-mips_kexec.patch @@ -0,0 +1,608 @@ +This patch updates kernel part of kexec for MIPS platform to support +kdump, 64-bit, SMP and simplify code adaptation to new boards. It does +the following: + +- hooks for machine-specific actions are introduced +(_machine_kexec_prepare, + _machine_kexec_shutdown, _machine_crash_shutdown); +- kexec reboot on SMP machine is implemented; +- add boot parameters passing to new kernel (array kexec_args[] is +copied to + registers a0-a3 on reboot ); +- crash dump functionality is added (boot kernel with non-default physical + start, parse "crashkernel=..." command line parameter, copy_oldmem_page() + is implemeted to read memory dump after reboot-on-crashi, +crash_setup_regs() + is updated to correctly store registers on crash); + +kexec/kdump funtionality was tested on several Cavium Octeon boards +(mips64 SMP). The way we do it was the following: +- _machine_kexec_prepare was find kexec segment with command line and +save it's pointed into internal bootloader structure. +- _machine_kexec_shutdown was used to stop boards IO and make all non-boot +CPUs spin in function relocated_kexec_smp_wait() +- _machine_crash_shutdown just calls default_machine_crash_shutdown() +We tested 1) 'common' kexec reboot (by 'kexec -e'), 2) kexec-on-panic +('kexec -p ...') and 3) access to/proc/vmcore (with gdb). + +Signed-off-by: Maxim Syrchin <[11]msyrchin at ru.mvista.com> +--- +arch/mips/Kconfig | 23 +++++++++ +arch/mips/Makefile | 4 ++ +arch/mips/kernel/Makefile | 3 +- +arch/mips/kernel/crash.c | 91 ++++++++++++++++++++++++++++++++++ +arch/mips/kernel/crash_dump.c | 96 ++++++++++++++++++++++++++++++++++++ +arch/mips/kernel/machine_kexec.c | 52 ++++++++++++++++++- +arch/mips/kernel/relocate_kernel.S | 93 ++++++++++++++++++++++++++++++++++- +arch/mips/kernel/setup.c | 10 +++- +arch/mips/include/asm/kexec.h | 21 ++++++++- +9 files changed, 386 insertions(+), 7 deletions(-) +create mode 100644 arch/mips/kernel/crash.c +create mode 100644 arch/mips/kernel/crash_dump.c + +--- + arch/mips/Kconfig | 23 23 + 0 - 0 ! + arch/mips/Makefile | 4 4 + 0 - 0 ! + arch/mips/kernel/Makefile | 3 2 + 1 - 0 ! + arch/mips/kernel/crash.c | 90 90 + 0 - 0 ! + arch/mips/kernel/crash_dump.c | 96 96 + 0 - 0 ! + arch/mips/kernel/machine_kexec.c | 66 60 + 6 - 0 ! + arch/mips/kernel/relocate_kernel.S | 96 95 + 1 - 0 ! + arch/mips/kernel/setup.c | 10 9 + 1 - 0 ! + arch/mips/include/asm/kexec.h | 21 20 + 1 - 0 ! + 9 files changed, 399 insertions(+), 10 deletions(-) + +--- a/arch/mips/Kconfig ++++ b/arch/mips/Kconfig +@@ -1966,6 +1966,29 @@ config KEXEC + support. As of this writing the exact hardware interface is + strongly in flux, so no good recommendation can be made. + ++config CRASH_DUMP ++ bool "kernel crash dumps (EXPERIMENTAL)" ++ depends on EXPERIMENTAL ++ help ++ Generate crash dump after being started by kexec. ++ This should be normally only set in special crash dump kernels ++ which are loaded in the main kernel with kexec-tools into ++ a specially reserved region and then later executed after ++ a crash by kdump/kexec. The crash dump kernel must be compiled ++ to a memory address not used by the main kernel or BIOS using ++ PHYSICAL_START. ++ ++config PHYSICAL_START ++ hex "Physical address where the kernel is loaded" ++ default "0xffffffff84000000" ++ depends on CRASH_DUMP ++ help ++ This gives the CKSEG0 or KSEG0 address where the kernel is loaded. ++ If you plan to use kernel for capturing the crash dump change ++ this value to start of the reserved region (the "X" value as ++ specified in the "crashkernel=[12]YM at XM" command line boot parameter ++ passed to the panic-ed kernel). ++ + config SECCOMP + bool "Enable seccomp to safely compute untrusted bytecode" + depends on PROC_FS +--- a/arch/mips/Makefile ++++ b/arch/mips/Makefile +@@ -603,6 +603,10 @@ else + load-$(CONFIG_CPU_CAVIUM_OCTEON) += 0xffffffff81100000 + endif + ++ifdef CONFIG_PHYSICAL_START ++load-y = $(CONFIG_PHYSICAL_START) ++endif ++ + cflags-y += -I$(srctree)/arch/mips/include/asm/mach-generic + drivers-$(CONFIG_PCI) += arch/mips/pci/ + +--- a/arch/mips/kernel/Makefile ++++ b/arch/mips/kernel/Makefile +@@ -83,7 +83,8 @@ obj-$(CONFIG_I8253) += i8253.o + + obj-$(CONFIG_GPIO_TXX9) += gpio_txx9.o + +-obj-$(CONFIG_KEXEC) += machine_kexec.o relocate_kernel.o ++obj-$(CONFIG_KEXEC) += machine_kexec.o relocate_kernel.o crash.o ++obj-$(CONFIG_CRASH_DUMP) += crash_dump.o + obj-$(CONFIG_EARLY_PRINTK) += early_printk.o + obj-$(CONFIG_MIPS_MACHINE) += mips_machine.o + +--- /dev/null ++++ b/arch/mips/kernel/crash.c +@@ -0,0 +1,90 @@ ++/* ++ * Architecture specific (MIPS) functions for kexec based crash dumps. ++ * ++ * Copyright (C) 2005, IBM Corp. ++ * Copyright (C) 2008, MontaVista Software Inc. ++ * ++ * This source code is licensed under the GNU General Public License, ++ * Version 2. See the file COPYING for more details. ++ * ++ */ ++ ++#undef DEBUG ++ ++#include <linux/kernel.h> ++#include <linux/smp.h> ++#include <linux/reboot.h> ++#include <linux/kexec.h> ++#include <linux/bootmem.h> ++#include <linux/crash_dump.h> ++#include <linux/delay.h> ++#include <linux/init.h> ++#include <linux/irq.h> ++#include <linux/types.h> ++#include <linux/sched.h> ++ ++ ++ ++/* This keeps a track of which one is crashing cpu. */ ++int crashing_cpu = -1; ++static cpumask_t cpus_in_crash = CPU_MASK_NONE; ++ ++#ifdef CONFIG_SMP ++ ++void crash_shutdown_secondary(void *ignore) ++{ ++ struct pt_regs* regs; ++ int cpu = smp_processor_id(); ++ ++ regs = task_pt_regs(current); ++ if (!cpu_online(cpu)) ++ return; ++ ++ local_irq_disable(); ++ if (!cpu_isset(cpu, cpus_in_crash)) ++ crash_save_cpu(regs, cpu); ++ cpu_set(cpu, cpus_in_crash); ++ ++ while(!atomic_read(&kexec_ready_to_reboot)) { ++ cpu_relax(); ++ } ++ relocated_kexec_smp_wait(NULL); ++ /* NOTREACHED */ ++} ++ ++static void crash_kexec_prepare_cpus(void) ++{ ++ unsigned int msecs; ++ ++ unsigned int ncpus = num_online_cpus() - 1;/* Excluding the panic cpu */ ++ ++ smp_call_function (crash_shutdown_secondary, NULL, 0); ++ smp_wmb(); ++ ++ /* ++ * FIXME: Until we will have the way to stop other CPUSs reliabally, ++ * the crash CPU will send an IPI and wait for other CPUs to ++ * respond. ++ * Delay of at least 10 seconds. ++ */ ++ printk(KERN_EMERG "Sending IPI to other cpus...\n"); ++ msecs = 10000; ++ while ((cpus_weight(cpus_in_crash) < ncpus) && (--msecs > 0)) { ++ cpu_relax(); ++ mdelay(1); ++ } ++ ++} ++ ++#else ++static void crash_kexec_prepare_cpus(void) {} ++#endif ++ ++void default_machine_crash_shutdown(struct pt_regs *regs) ++{ ++ local_irq_disable(); ++ crashing_cpu = smp_processor_id(); ++ crash_save_cpu(regs, crashing_cpu); ++ crash_kexec_prepare_cpus(); ++ cpu_set(crashing_cpu, cpus_in_crash); ++} +--- /dev/null ++++ b/arch/mips/kernel/crash_dump.c +@@ -0,0 +1,96 @@ ++/* ++ * Routines for doing kexec-based kdump. ++ * ++ * Copyright (C) 2005, IBM Corp. ++ * Copyright (C) 2008, MontaVista Software Inc. ++ * ++ * This source code is licensed under the GNU General Public License, ++ * Version 2. See the file COPYING for more details. ++ */ ++ ++#include <linux/highmem.h> ++#include <linux/bootmem.h> ++#include <linux/crash_dump.h> ++#include <asm/uaccess.h> ++ ++#ifdef CONFIG_PROC_VMCORE ++static int __init parse_elfcorehdr(char *p) ++{ ++ if (p) ++ elfcorehdr_addr = memparse(p, &p); ++ return 1; ++} ++__setup("elfcorehdr=", parse_elfcorehdr); ++#endif ++ ++static int __init parse_savemaxmem(char *p) ++{ ++ if (p) ++ saved_max_pfn = (memparse(p, &p) >> PAGE_SHIFT) - 1; ++ ++ return 1; ++} ++__setup("savemaxmem=", parse_savemaxmem); ++ ++ ++static void *kdump_buf_page; ++ ++/** ++ * copy_oldmem_page - copy one page from "oldmem" ++ * @pfn: page frame number to be copied ++ * @buf: target memory address for the copy; this can be in kernel address ++ * space or user address space (see @userbuf) ++ * @csize: number of bytes to copy ++ * @offset: offset in bytes into the page (based on pfn) to begin the copy ++ * @userbuf: if set, @buf is in user address space, use copy_to_user(), ++ * otherwise @buf is in kernel address space, use memcpy(). ++ * ++ * Copy a page from "oldmem". For this page, there is no pte mapped ++ * in the current kernel. ++ * ++ * Calling copy_to_user() in atomic context is not desirable. Hence first ++ * copying the data to a pre-allocated kernel page and then copying to user ++ * space in non-atomic context. ++ */ ++ssize_t copy_oldmem_page(unsigned long pfn, char *buf, ++ size_t csize, unsigned long offset, int userbuf) ++{ ++ void *vaddr; ++ ++ if (!csize) ++ return 0; ++ ++ vaddr = kmap_atomic_pfn(pfn, KM_PTE0); ++ ++ if (!userbuf) { ++ memcpy(buf, (vaddr + offset), csize); ++ kunmap_atomic(vaddr, KM_PTE0); ++ } else { ++ if (!kdump_buf_page) { ++ printk(KERN_WARNING "Kdump: Kdump buffer page not" ++ " allocated\n"); ++ return -EFAULT; ++ } ++ copy_page(kdump_buf_page, vaddr); ++ kunmap_atomic(vaddr, KM_PTE0); ++ if (copy_to_user(buf, (kdump_buf_page + offset), csize)) ++ return -EFAULT; ++ } ++ ++ return csize; ++} ++ ++static int __init kdump_buf_page_init(void) ++{ ++ int ret = 0; ++ ++ kdump_buf_page = kmalloc(PAGE_SIZE, GFP_KERNEL); ++ if (!kdump_buf_page) { ++ printk(KERN_WARNING "Kdump: Failed to allocate kdump buffer" ++ " page\n"); ++ ret = -ENOMEM; ++ } ++ ++ return ret; ++} ++arch_initcall(kdump_buf_page_init); +--- a/arch/mips/kernel/machine_kexec.c ++++ b/arch/mips/kernel/machine_kexec.c +@@ -19,9 +19,25 @@ extern const size_t relocate_new_kernel_ + extern unsigned long kexec_start_address; + extern unsigned long kexec_indirection_page; + ++extern unsigned long fw_arg0, fw_arg1, fw_arg2, fw_arg3; ++ ++int (*_machine_kexec_prepare)(struct kimage *) = NULL; ++void (*_machine_kexec_shutdown)(void) = NULL; ++void (*_machine_crash_shutdown)(struct pt_regs *regs) = NULL; ++#ifdef CONFIG_SMP ++void (*relocated_kexec_smp_wait) (void *); ++atomic_t kexec_ready_to_reboot = ATOMIC_INIT(0); ++#endif ++ + int + machine_kexec_prepare(struct kimage *kimage) + { ++ kexec_args[0] = fw_arg0; ++ kexec_args[1] = fw_arg1; ++ kexec_args[2] = fw_arg2; ++ kexec_args[3] = fw_arg3; ++ if (_machine_kexec_prepare) ++ return _machine_kexec_prepare(kimage); + return 0; + } + +@@ -33,13 +49,18 @@ machine_kexec_cleanup(struct kimage *kim + void + machine_shutdown(void) + { ++ if (_machine_kexec_shutdown) ++ _machine_kexec_shutdown(); + } + + void + machine_crash_shutdown(struct pt_regs *regs) + { ++ if (_machine_crash_shutdown) ++ _machine_crash_shutdown(regs); ++ else ++ default_machine_crash_shutdown(regs); + } +- + typedef void (*noretfun_t)(void) __attribute__((noreturn)); + + void +@@ -63,7 +84,7 @@ machine_kexec(struct kimage *image) + * The generic kexec code builds a page list with physical + * addresses. they are directly accessible through KSEG0 (or + * CKSEG0 or XPHYS if on 64bit system), hence the +- * pys_to_virt() call. ++ * phys_to_virt() call. + */ + for (ptr = &image->head; (entry = *ptr) && !(entry &IND_DONE); + ptr = (entry & IND_INDIRECTION) ? +@@ -78,8 +99,39 @@ machine_kexec(struct kimage *image) + */ + local_irq_disable(); + +- printk("Will call new kernel at %08lx\n", image->start); +- printk("Bye ...\n"); ++ printk(KERN_EMERG "Will call new kernel at %08lx\n", image->start); ++ printk(KERN_EMERG "Bye ...\n"); + __flush_cache_all(); +- ((noretfun_t) reboot_code_buffer)(); ++#ifdef CONFIG_SMP ++ /* All secondary cpus now may jump to kexec_wait cycle */ ++ relocated_kexec_smp_wait = (void *)(reboot_code_buffer + ++ (kexec_smp_wait - relocate_new_kernel)); ++ smp_wmb(); ++ atomic_set(&kexec_ready_to_reboot,1); ++#endif ++ ++ ((noretfun_t) reboot_code_buffer)(); ++ printk(KERN_EMERG "Bye ...\n"); ++} ++ ++/* crashkernel=[13]size at addr specifies the location to reserve for ++ * a crash kernel. By reserving this memory we guarantee ++ * that linux never sets it up as a DMA target. ++ * Useful for holding code to do something appropriate ++ * after a kernel panic. ++ */ ++static int __init parse_crashkernel_cmdline(char *arg) ++{ ++ unsigned long size, base; ++ size = memparse(arg, &arg); ++ if (*arg == '@') { ++ base = memparse(arg+1, &arg); ++ /* FIXME: Do I want a sanity check ++ * to validate the memory range? ++ */ ++ crashk_res.start = base; ++ crashk_res.end = base + size - 1; ++ } ++ return 0; + } ++early_param("crashkernel", parse_crashkernel_cmdline); +--- a/arch/mips/kernel/relocate_kernel.S ++++ b/arch/mips/kernel/relocate_kernel.S +@@ -14,7 +14,13 @@ + #include <asm/stackframe.h> + #include <asm/addrspace.h> + ++ + LEAF(relocate_new_kernel) ++ PTR_L a0, arg0 ++ PTR_L a1, arg1 ++ PTR_L a2, arg2 ++ PTR_L a3, arg3 ++ + PTR_L s0, kexec_indirection_page + PTR_L s1, kexec_start_address + +@@ -26,7 +32,6 @@ process_entry: + and s3, s2, 0x1 + beq s3, zero, 1f + and s4, s2, ~0x1 /* store destination addr in s4 */ +- move a0, s4 + b process_entry + + 1: +@@ -40,6 +45,7 @@ process_entry: + /* done page */ + and s3, s2, 0x4 + beq s3, zero, 1f ++ nop + b done + 1: + /* source page */ +@@ -56,14 +62,102 @@ copy_word: + PTR_ADD s2, s2, SZREG + LONG_SUB s6, s6, 1 + beq s6, zero, process_entry ++ nop + b copy_word ++ nop + b process_entry + + done: ++#ifdef CONFIG_SMP ++ /* kexec_flag reset is signal to other CPUs what kernel ++ was moved to it's location. Note - we need relocated address ++ of kexec_flag. */ ++ ++ bal 1f ++ 1: move t1,ra; ++ PTR_LA t2,1b ++ PTR_LA t0,kexec_flag ++ PTR_SUB t0,t0,t2; ++ PTR_ADD t0,t1,t0; ++ LONG_S zero,(t0) ++#endif ++ ++ /* Some platforms need I-cache to be flushed before ++ * jumping to new kernel. ++ */ ++ + /* jump to kexec_start_address */ + j s1 + END(relocate_new_kernel) + ++#ifdef CONFIG_SMP ++/* ++ * Other CPUs should wait until code is relocated and ++ * then start at entry point. ++ */ ++LEAF(kexec_smp_wait) ++ PTR_L a0, s_arg0 ++ PTR_L a1, s_arg1 ++ PTR_L a2, s_arg2 ++ PTR_L a3, s_arg3 ++ PTR_L s1, kexec_start_address ++ ++ /* Non-relocated address works for args and kexec_start_address ( old ++ * kernel is not overwritten). But we need relocated address of ++ * kexec_flag. ++ */ ++ ++ bal 1f ++1: move t1,ra; ++ PTR_LA t2,1b ++ PTR_LA t0,kexec_flag ++ PTR_SUB t0,t0,t2; ++ PTR_ADD t0,t1,t0; ++ ++1: LONG_L s0, (t0) ++ bne s0, zero,1b ++ ++ j s1 ++ END(kexec_smp_wait) ++#endif ++ ++ ++#ifdef __mips64 ++ /* all PTR's must be aligned to 8 byte in 64-bit mode */ ++ .align 3 ++#endif ++ ++/* All parameters to new kernel are passed in registers a0-a3. ++ * kexec_args[0..3] are uses to prepare register values. ++ */ ++ ++kexec_args: ++ EXPORT(kexec_args) ++arg0: PTR 0x0 ++arg1: PTR 0x0 ++arg2: PTR 0x0 ++arg3: PTR 0x0 ++ .size kexec_args,PTRSIZE*4 ++ ++#ifdef CONFIG_SMP ++/* ++ * Secondary CPUs may have different kernel parameters in ++ * their registers a0-a3. secondary_kexec_args[0..3] are used ++ * to prepare register values. ++ */ ++secondary_kexec_args: ++ EXPORT(secondary_kexec_args) ++s_arg0: PTR 0x0 ++s_arg1: PTR 0x0 ++s_arg2: PTR 0x0 ++s_arg3: PTR 0x0 ++ .size secondary_kexec_args,PTRSIZE*4 ++kexec_flag: ++ LONG 0x1 ++ ++#endif ++ ++ + kexec_start_address: + EXPORT(kexec_start_address) + PTR 0x0 +--- a/arch/mips/kernel/setup.c ++++ b/arch/mips/kernel/setup.c +@@ -21,7 +21,7 @@ + #include <linux/console.h> + #include <linux/pfn.h> + #include <linux/debugfs.h> +- ++#include <linux/kexec.h> + #include <asm/addrspace.h> + #include <asm/bootinfo.h> + #include <asm/bugs.h> +@@ -489,6 +489,11 @@ static void __init arch_mem_init(char ** + } + + bootmem_init(); ++#ifdef CONFIG_CRASH_DUMP ++ if (crashk_res.start != crashk_res.end) ++ reserve_bootmem(crashk_res.start, ++ crashk_res.end - crashk_res.start + 1); ++#endif + sparse_init(); + paging_init(); + } +@@ -543,6 +548,9 @@ static void __init resource_init(void) + */ + request_resource(res, &code_resource); + request_resource(res, &data_resource); ++#ifdef CONFIG_KEXEC ++ request_resource(res, &crashk_res); ++#endif + } + } + +--- a/arch/mips/include/asm/kexec.h ++++ b/arch/mips/include/asm/kexec.h +@@ -9,6 +9,8 @@ + #ifndef _MIPS_KEXEC + # define _MIPS_KEXEC + ++#include <asm/stacktrace.h> ++ + /* Maximum physical address we can use pages from */ + #define KEXEC_SOURCE_MEMORY_LIMIT (0x20000000) + /* Maximum address we can reach in physical address mode */ +@@ -24,7 +26,24 @@ + static inline void crash_setup_regs(struct pt_regs *newregs, + struct pt_regs *oldregs) + { +- /* Dummy implementation for now */ ++ if (oldregs) ++ memcpy(newregs, oldregs, sizeof(*newregs)); ++ else ++ prepare_frametrace(newregs); + } + ++#ifdef CONFIG_KEXEC ++struct kimage; ++extern unsigned long kexec_args[4]; ++extern int (*_machine_kexec_prepare)(struct kimage *); ++extern void (*_machine_kexec_shutdown)(void); ++extern void (*_machine_crash_shutdown)(struct pt_regs *regs); ++extern void default_machine_crash_shutdown(struct pt_regs *regs); ++#ifdef CONFIG_SMP ++extern const unsigned char kexec_smp_wait[]; ++extern unsigned long secondary_kexec_args[4]; ++extern void (*relocated_kexec_smp_wait) (void *); ++extern atomic_t kexec_ready_to_reboot; ++#endif ++#endif + #endif /* !_MIPS_KEXEC */ |