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author | Gabor Juhos <juhosg@openwrt.org> | 2012-04-21 15:18:55 +0000 |
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committer | Gabor Juhos <juhosg@openwrt.org> | 2012-04-21 15:18:55 +0000 |
commit | 5ae4549c65025643aa31c4e38e6f2eb6c59e709b (patch) | |
tree | 0e218522de42e6e66e11362d3b24d31edb1f3dd5 /target/linux/generic/patches-2.6.30/029-mips_kexec.patch | |
parent | e61d1ccbbf915c09d493ecb4dadcb8bf551d2828 (diff) | |
download | master-187ad058-5ae4549c65025643aa31c4e38e6f2eb6c59e709b.tar.gz master-187ad058-5ae4549c65025643aa31c4e38e6f2eb6c59e709b.tar.bz2 master-187ad058-5ae4549c65025643aa31c4e38e6f2eb6c59e709b.zip |
linux/2.6.30: R.I.P.
git-svn-id: svn://svn.openwrt.org/openwrt/trunk@31411 3c298f89-4303-0410-b956-a3cf2f4a3e73
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, 0 insertions, 608 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 deleted file mode 100644 index 0eebacfa3f..0000000000 --- a/target/linux/generic/patches-2.6.30/029-mips_kexec.patch +++ /dev/null @@ -1,608 +0,0 @@ -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 */ |