MIPS: kdump: Add support
[ralf@linux-mips.org: Original patch by Maxim Uvarov <muvarov@gmail.com> with plenty of further shining, polishing, debugging and testing by me.] Signed-off-by: Maxim Uvarov <muvarov@gmail.com> Cc: linux-mips@linux-mips.org Cc: kexec@lists.infradead.org Cc: horms@verge.net.au Patchwork: https://patchwork.linux-mips.org/patch/1025/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
Ralf Baechle
parent
98cdee0eae
commit
7aa1c8f47e
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@ -2379,6 +2379,29 @@ config KEXEC
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support. As of this writing the exact hardware interface is
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strongly in flux, so no good recommendation can be made.
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config CRASH_DUMP
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bool "Kernel crash dumps"
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help
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Generate crash dump after being started by kexec.
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This should be normally only set in special crash dump kernels
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which are loaded in the main kernel with kexec-tools into
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a specially reserved region and then later executed after
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a crash by kdump/kexec. The crash dump kernel must be compiled
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to a memory address not used by the main kernel or firmware using
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PHYSICAL_START.
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config PHYSICAL_START
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hex "Physical address where the kernel is loaded"
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default "0xffffffff84000000" if 64BIT
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default "0x84000000" if 32BIT
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depends on CRASH_DUMP
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help
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This gives the CKSEG0 or KSEG0 address where the kernel is loaded.
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If you plan to use kernel for capturing the crash dump change
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this value to start of the reserved region (the "X" value as
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specified in the "crashkernel=YM@XM" command line boot parameter
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passed to the panic-ed kernel).
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config SECCOMP
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bool "Enable seccomp to safely compute untrusted bytecode"
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depends on PROC_FS
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@ -9,22 +9,43 @@
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#ifndef _MIPS_KEXEC
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# define _MIPS_KEXEC
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#include <asm/stacktrace.h>
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/* Maximum physical address we can use pages from */
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#define KEXEC_SOURCE_MEMORY_LIMIT (0x20000000)
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/* Maximum address we can reach in physical address mode */
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#define KEXEC_DESTINATION_MEMORY_LIMIT (0x20000000)
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/* Maximum address we can use for the control code buffer */
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#define KEXEC_CONTROL_MEMORY_LIMIT (0x20000000)
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#define KEXEC_CONTROL_PAGE_SIZE 4096
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/* Reserve 3*4096 bytes for board-specific info */
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#define KEXEC_CONTROL_PAGE_SIZE (4096 + 3*4096)
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/* The native architecture */
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#define KEXEC_ARCH KEXEC_ARCH_MIPS
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#define MAX_NOTE_BYTES 1024
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static inline void crash_setup_regs(struct pt_regs *newregs,
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struct pt_regs *oldregs)
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{
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/* Dummy implementation for now */
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if (oldregs)
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memcpy(newregs, oldregs, sizeof(*newregs));
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else
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prepare_frametrace(newregs);
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}
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#ifdef CONFIG_KEXEC
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struct kimage;
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extern unsigned long kexec_args[4];
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extern int (*_machine_kexec_prepare)(struct kimage *);
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extern void (*_machine_kexec_shutdown)(void);
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extern void (*_machine_crash_shutdown)(struct pt_regs *regs);
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extern void default_machine_crash_shutdown(struct pt_regs *regs);
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#ifdef CONFIG_SMP
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extern const unsigned char kexec_smp_wait[];
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extern unsigned long secondary_kexec_args[4];
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extern void (*relocated_kexec_smp_wait) (void *);
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extern atomic_t kexec_ready_to_reboot;
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#endif
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#endif
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#endif /* !_MIPS_KEXEC */
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@ -40,6 +40,8 @@ extern int __cpu_logical_map[NR_CPUS];
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#define SMP_CALL_FUNCTION 0x2
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/* Octeon - Tell another core to flush its icache */
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#define SMP_ICACHE_FLUSH 0x4
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/* Used by kexec crashdump to save all cpu's state */
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#define SMP_DUMP 0x8
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extern volatile cpumask_t cpu_callin_map;
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@ -91,4 +93,8 @@ static inline void arch_send_call_function_ipi_mask(const struct cpumask *mask)
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mp_ops->send_ipi_mask(mask, SMP_CALL_FUNCTION);
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}
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#if defined(CONFIG_KEXEC)
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extern void (*dump_ipi_function_ptr)(void *);
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void dump_send_ipi(void (*dump_ipi_callback)(void *));
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#endif
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#endif /* __ASM_SMP_H */
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@ -80,7 +80,8 @@ obj-$(CONFIG_I8253) += i8253.o
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obj-$(CONFIG_GPIO_TXX9) += gpio_txx9.o
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obj-$(CONFIG_KEXEC) += machine_kexec.o relocate_kernel.o
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obj-$(CONFIG_KEXEC) += machine_kexec.o relocate_kernel.o crash.o
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obj-$(CONFIG_CRASH_DUMP) += crash_dump.o
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obj-$(CONFIG_EARLY_PRINTK) += early_printk.o
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obj-$(CONFIG_SPINLOCK_TEST) += spinlock_test.o
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obj-$(CONFIG_MIPS_MACHINE) += mips_machine.o
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@ -0,0 +1,71 @@
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#include <linux/kernel.h>
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#include <linux/smp.h>
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#include <linux/reboot.h>
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#include <linux/kexec.h>
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#include <linux/bootmem.h>
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#include <linux/crash_dump.h>
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#include <linux/delay.h>
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#include <linux/init.h>
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#include <linux/irq.h>
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#include <linux/types.h>
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#include <linux/sched.h>
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/* This keeps a track of which one is crashing cpu. */
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static int crashing_cpu = -1;
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static cpumask_t cpus_in_crash = CPU_MASK_NONE;
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#ifdef CONFIG_SMP
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static void crash_shutdown_secondary(void *ignore)
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{
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struct pt_regs *regs;
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int cpu = smp_processor_id();
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regs = task_pt_regs(current);
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if (!cpu_online(cpu))
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return;
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local_irq_disable();
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if (!cpu_isset(cpu, cpus_in_crash))
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crash_save_cpu(regs, cpu);
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cpu_set(cpu, cpus_in_crash);
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while (!atomic_read(&kexec_ready_to_reboot))
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cpu_relax();
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relocated_kexec_smp_wait(NULL);
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/* NOTREACHED */
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}
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static void crash_kexec_prepare_cpus(void)
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{
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unsigned int msecs;
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unsigned int ncpus = num_online_cpus() - 1;/* Excluding the panic cpu */
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dump_send_ipi(crash_shutdown_secondary);
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smp_wmb();
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/*
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* The crash CPU sends an IPI and wait for other CPUs to
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* respond. Delay of at least 10 seconds.
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*/
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pr_emerg("Sending IPI to other cpus...\n");
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msecs = 10000;
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while ((cpus_weight(cpus_in_crash) < ncpus) && (--msecs > 0)) {
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cpu_relax();
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mdelay(1);
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}
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}
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#else /* !defined(CONFIG_SMP) */
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static void crash_kexec_prepare_cpus(void) {}
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#endif /* !defined(CONFIG_SMP) */
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void default_machine_crash_shutdown(struct pt_regs *regs)
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{
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local_irq_disable();
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crashing_cpu = smp_processor_id();
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crash_save_cpu(regs, crashing_cpu);
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crash_kexec_prepare_cpus();
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cpu_set(crashing_cpu, cpus_in_crash);
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}
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@ -0,0 +1,77 @@
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#include <linux/highmem.h>
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#include <linux/bootmem.h>
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#include <linux/crash_dump.h>
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#include <asm/uaccess.h>
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unsigned long long elfcorehdr_addr = ELFCORE_ADDR_MAX;
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static int __init parse_savemaxmem(char *p)
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{
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if (p)
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saved_max_pfn = (memparse(p, &p) >> PAGE_SHIFT) - 1;
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return 1;
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}
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__setup("savemaxmem=", parse_savemaxmem);
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static void *kdump_buf_page;
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/**
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* copy_oldmem_page - copy one page from "oldmem"
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* @pfn: page frame number to be copied
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* @buf: target memory address for the copy; this can be in kernel address
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* space or user address space (see @userbuf)
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* @csize: number of bytes to copy
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* @offset: offset in bytes into the page (based on pfn) to begin the copy
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* @userbuf: if set, @buf is in user address space, use copy_to_user(),
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* otherwise @buf is in kernel address space, use memcpy().
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*
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* Copy a page from "oldmem". For this page, there is no pte mapped
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* in the current kernel.
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*
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* Calling copy_to_user() in atomic context is not desirable. Hence first
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* copying the data to a pre-allocated kernel page and then copying to user
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* space in non-atomic context.
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*/
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ssize_t copy_oldmem_page(unsigned long pfn, char *buf,
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size_t csize, unsigned long offset, int userbuf)
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{
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void *vaddr;
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if (!csize)
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return 0;
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vaddr = kmap_atomic_pfn(pfn);
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if (!userbuf) {
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memcpy(buf, (vaddr + offset), csize);
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kunmap_atomic(vaddr);
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} else {
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if (!kdump_buf_page) {
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pr_warning("Kdump: Kdump buffer page not allocated\n");
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return -EFAULT;
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}
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copy_page(kdump_buf_page, vaddr);
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kunmap_atomic(vaddr);
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if (copy_to_user(buf, (kdump_buf_page + offset), csize))
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return -EFAULT;
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}
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return csize;
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}
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static int __init kdump_buf_page_init(void)
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{
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int ret = 0;
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kdump_buf_page = kmalloc(PAGE_SIZE, GFP_KERNEL);
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if (!kdump_buf_page) {
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pr_warning("Kdump: Failed to allocate kdump buffer page\n");
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ret = -ENOMEM;
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}
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return ret;
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}
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arch_initcall(kdump_buf_page_init);
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@ -5,7 +5,7 @@
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* This source code is licensed under the GNU General Public License,
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* Version 2. See the file COPYING for more details.
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*/
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#include <linux/compiler.h>
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#include <linux/kexec.h>
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#include <linux/mm.h>
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#include <linux/delay.h>
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@ -19,9 +19,19 @@ extern const size_t relocate_new_kernel_size;
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extern unsigned long kexec_start_address;
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extern unsigned long kexec_indirection_page;
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int (*_machine_kexec_prepare)(struct kimage *) = NULL;
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void (*_machine_kexec_shutdown)(void) = NULL;
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void (*_machine_crash_shutdown)(struct pt_regs *regs) = NULL;
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#ifdef CONFIG_SMP
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void (*relocated_kexec_smp_wait) (void *);
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atomic_t kexec_ready_to_reboot = ATOMIC_INIT(0);
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#endif
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int
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machine_kexec_prepare(struct kimage *kimage)
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{
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if (_machine_kexec_prepare)
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return _machine_kexec_prepare(kimage);
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return 0;
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}
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@ -33,14 +43,20 @@ machine_kexec_cleanup(struct kimage *kimage)
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void
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machine_shutdown(void)
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{
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if (_machine_kexec_shutdown)
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_machine_kexec_shutdown();
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}
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void
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machine_crash_shutdown(struct pt_regs *regs)
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{
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if (_machine_crash_shutdown)
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_machine_crash_shutdown(regs);
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else
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default_machine_crash_shutdown(regs);
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}
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typedef void (*noretfun_t)(void) __attribute__((noreturn));
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typedef void (*noretfun_t)(void) __noreturn;
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void
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machine_kexec(struct kimage *image)
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@ -52,7 +68,9 @@ machine_kexec(struct kimage *image)
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reboot_code_buffer =
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(unsigned long)page_address(image->control_code_page);
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kexec_start_address = image->start;
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kexec_start_address =
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(unsigned long) phys_to_virt(image->start);
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kexec_indirection_page =
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(unsigned long) phys_to_virt(image->head & PAGE_MASK);
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@ -63,7 +81,7 @@ machine_kexec(struct kimage *image)
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* The generic kexec code builds a page list with physical
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* addresses. they are directly accessible through KSEG0 (or
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* CKSEG0 or XPHYS if on 64bit system), hence the
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* pys_to_virt() call.
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* phys_to_virt() call.
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*/
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for (ptr = &image->head; (entry = *ptr) && !(entry &IND_DONE);
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ptr = (entry & IND_INDIRECTION) ?
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@ -81,5 +99,12 @@ machine_kexec(struct kimage *image)
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printk("Will call new kernel at %08lx\n", image->start);
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printk("Bye ...\n");
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__flush_cache_all();
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#ifdef CONFIG_SMP
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/* All secondary cpus now may jump to kexec_wait cycle */
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relocated_kexec_smp_wait = reboot_code_buffer +
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(void *)(kexec_smp_wait - relocate_new_kernel);
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smp_wmb();
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atomic_set(&kexec_ready_to_reboot, 1);
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#endif
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((noretfun_t) reboot_code_buffer)();
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}
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@ -15,6 +15,11 @@
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#include <asm/addrspace.h>
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LEAF(relocate_new_kernel)
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PTR_L a0, arg0
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PTR_L a1, arg1
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PTR_L a2, arg2
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PTR_L a3, arg3
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PTR_L s0, kexec_indirection_page
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PTR_L s1, kexec_start_address
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@ -26,7 +31,6 @@ process_entry:
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and s3, s2, 0x1
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beq s3, zero, 1f
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and s4, s2, ~0x1 /* store destination addr in s4 */
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move a0, s4
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b process_entry
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1:
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@ -60,10 +64,92 @@ copy_word:
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b process_entry
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done:
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#ifdef CONFIG_SMP
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/* kexec_flag reset is signal to other CPUs what kernel
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was moved to it's location. Note - we need relocated address
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of kexec_flag. */
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bal 1f
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1: move t1,ra;
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PTR_LA t2,1b
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PTR_LA t0,kexec_flag
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PTR_SUB t0,t0,t2;
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PTR_ADD t0,t1,t0;
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LONG_S zero,(t0)
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#endif
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sync
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/* jump to kexec_start_address */
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j s1
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END(relocate_new_kernel)
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#ifdef CONFIG_SMP
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/*
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* Other CPUs should wait until code is relocated and
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* then start at entry (?) point.
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*/
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LEAF(kexec_smp_wait)
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PTR_L a0, s_arg0
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PTR_L a1, s_arg1
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PTR_L a2, s_arg2
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PTR_L a3, s_arg3
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PTR_L s1, kexec_start_address
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/* Non-relocated address works for args and kexec_start_address ( old
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* kernel is not overwritten). But we need relocated address of
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* kexec_flag.
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*/
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bal 1f
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1: move t1,ra;
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PTR_LA t2,1b
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PTR_LA t0,kexec_flag
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PTR_SUB t0,t0,t2;
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PTR_ADD t0,t1,t0;
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1: LONG_L s0, (t0)
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bne s0, zero,1b
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sync
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j s1
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END(kexec_smp_wait)
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#endif
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#ifdef __mips64
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/* all PTR's must be aligned to 8 byte in 64-bit mode */
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.align 3
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#endif
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/* All parameters to new kernel are passed in registers a0-a3.
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* kexec_args[0..3] are uses to prepare register values.
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*/
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kexec_args:
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EXPORT(kexec_args)
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arg0: PTR 0x0
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arg1: PTR 0x0
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arg2: PTR 0x0
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arg3: PTR 0x0
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.size kexec_args,PTRSIZE*4
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#ifdef CONFIG_SMP
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/*
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* Secondary CPUs may have different kernel parameters in
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* their registers a0-a3. secondary_kexec_args[0..3] are used
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* to prepare register values.
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*/
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secondary_kexec_args:
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EXPORT(secondary_kexec_args)
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s_arg0: PTR 0x0
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s_arg1: PTR 0x0
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s_arg2: PTR 0x0
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s_arg3: PTR 0x0
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.size secondary_kexec_args,PTRSIZE*4
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kexec_flag:
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LONG 0x1
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#endif
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kexec_start_address:
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EXPORT(kexec_start_address)
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PTR 0x0
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@ -22,6 +22,7 @@
|
|||
#include <linux/console.h>
|
||||
#include <linux/pfn.h>
|
||||
#include <linux/debugfs.h>
|
||||
#include <linux/kexec.h>
|
||||
|
||||
#include <asm/addrspace.h>
|
||||
#include <asm/bootinfo.h>
|
||||
|
|
@ -536,12 +537,64 @@ static void __init arch_mem_init(char **cmdline_p)
|
|||
}
|
||||
|
||||
bootmem_init();
|
||||
#ifdef CONFIG_KEXEC
|
||||
if (crashk_res.start != crashk_res.end)
|
||||
reserve_bootmem(crashk_res.start,
|
||||
crashk_res.end - crashk_res.start + 1,
|
||||
BOOTMEM_DEFAULT);
|
||||
#endif
|
||||
device_tree_init();
|
||||
sparse_init();
|
||||
plat_swiotlb_setup();
|
||||
paging_init();
|
||||
}
|
||||
|
||||
#ifdef CONFIG_KEXEC
|
||||
static inline unsigned long long get_total_mem(void)
|
||||
{
|
||||
unsigned long long total;
|
||||
|
||||
total = max_pfn - min_low_pfn;
|
||||
return total << PAGE_SHIFT;
|
||||
}
|
||||
|
||||
static void __init mips_parse_crashkernel(void)
|
||||
{
|
||||
unsigned long long total_mem;
|
||||
unsigned long long crash_size, crash_base;
|
||||
int ret;
|
||||
|
||||
total_mem = get_total_mem();
|
||||
ret = parse_crashkernel(boot_command_line, total_mem,
|
||||
&crash_size, &crash_base);
|
||||
if (ret != 0 || crash_size <= 0)
|
||||
return;
|
||||
|
||||
crashk_res.start = crash_base;
|
||||
crashk_res.end = crash_base + crash_size - 1;
|
||||
}
|
||||
|
||||
static void __init request_crashkernel(struct resource *res)
|
||||
{
|
||||
int ret;
|
||||
|
||||
ret = request_resource(res, &crashk_res);
|
||||
if (!ret)
|
||||
pr_info("Reserving %ldMB of memory at %ldMB for crashkernel\n",
|
||||
(unsigned long)((crashk_res.end -
|
||||
crashk_res.start + 1) >> 20),
|
||||
(unsigned long)(crashk_res.start >> 20));
|
||||
}
|
||||
#else /* !defined(CONFIG_KEXEC) */
|
||||
static void __init mips_parse_crashkernel(void)
|
||||
{
|
||||
}
|
||||
|
||||
static void __init request_crashkernel(struct resource *res)
|
||||
{
|
||||
}
|
||||
#endif /* !defined(CONFIG_KEXEC) */
|
||||
|
||||
static void __init resource_init(void)
|
||||
{
|
||||
int i;
|
||||
|
|
@ -557,6 +610,8 @@ static void __init resource_init(void)
|
|||
/*
|
||||
* Request address space for all standard RAM.
|
||||
*/
|
||||
mips_parse_crashkernel();
|
||||
|
||||
for (i = 0; i < boot_mem_map.nr_map; i++) {
|
||||
struct resource *res;
|
||||
unsigned long start, end;
|
||||
|
|
@ -593,6 +648,7 @@ static void __init resource_init(void)
|
|||
*/
|
||||
request_resource(res, &code_resource);
|
||||
request_resource(res, &data_resource);
|
||||
request_crashkernel(res);
|
||||
}
|
||||
}
|
||||
|
||||
|
|
|
|||
|
|
@ -386,3 +386,20 @@ void flush_tlb_one(unsigned long vaddr)
|
|||
|
||||
EXPORT_SYMBOL(flush_tlb_page);
|
||||
EXPORT_SYMBOL(flush_tlb_one);
|
||||
|
||||
#if defined(CONFIG_KEXEC)
|
||||
void (*dump_ipi_function_ptr)(void *) = NULL;
|
||||
void dump_send_ipi(void (*dump_ipi_callback)(void *))
|
||||
{
|
||||
int i;
|
||||
int cpu = smp_processor_id();
|
||||
|
||||
dump_ipi_function_ptr = dump_ipi_callback;
|
||||
smp_mb();
|
||||
for_each_online_cpu(i)
|
||||
if (i != cpu)
|
||||
mp_ops->send_ipi_single(i, SMP_DUMP);
|
||||
|
||||
}
|
||||
EXPORT_SYMBOL(dump_send_ipi);
|
||||
#endif
|
||||
|
|
|
|||
|
|
@ -13,6 +13,7 @@
|
|||
*/
|
||||
#include <linux/bug.h>
|
||||
#include <linux/compiler.h>
|
||||
#include <linux/kexec.h>
|
||||
#include <linux/init.h>
|
||||
#include <linux/kernel.h>
|
||||
#include <linux/module.h>
|
||||
|
|
@ -409,6 +410,9 @@ void __noreturn die(const char *str, struct pt_regs *regs)
|
|||
panic("Fatal exception");
|
||||
}
|
||||
|
||||
if (regs && kexec_should_crash(current))
|
||||
crash_kexec(regs);
|
||||
|
||||
do_exit(sig);
|
||||
}
|
||||
|
||||
|
|
|
|||
Loading…
Reference in New Issue