* [PATCH 1/2] MIPS kexec,kdump support
@ 2010-03-03 11:05 ` Maxim Uvarov
0 siblings, 0 replies; 11+ messages in thread
From: Maxim Uvarov @ 2010-03-03 11:05 UTC (permalink / raw)
To: linux-mips, kexec; +Cc: horms, ralf
Hello folks,
Please find here MIPS crash and kdump patches.
This is patch set of 3 patches:
1. generic MIPS changes (kernel);
2. MIPS Cavium Octeon board kexec/kdump code (kernel);
3. Kexec user space MIPS changes.
Patches were tested on the latest linux-mips@ git kernel and the latest
kexec-tools git on Cavium Octeon 50xx board.
I also made the same code working on RMI XLR/XLS boards for both
mips32 and mips64 kernels.
Best regards,
Maxim Uvarov.
---
arch/mips/Kconfig | 24 ++++++++++
arch/mips/Makefile | 4 ++
arch/mips/include/asm/kexec.h | 31 +++++++++++--
arch/mips/include/asm/smp.h | 7 +++
arch/mips/kernel/Makefile | 3 +
arch/mips/kernel/crash.c | 75 +++++++++++++++++++++++++++++++
arch/mips/kernel/crash_dump.c | 86 +++++++++++++++++++++++++++++++++++
arch/mips/kernel/machine_kexec.c | 30 +++++++++++-
arch/mips/kernel/relocate_kernel.S | 88 ++++++++++++++++++++++++++++++++++++
arch/mips/kernel/setup.c | 55 +++++++++++++++++++++++
arch/mips/kernel/smp.c | 18 +++++++
11 files changed, 413 insertions(+), 8 deletions(-)
create mode 100644 arch/mips/kernel/crash.c
create mode 100644 arch/mips/kernel/crash_dump.c
diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
index 591ca0c..8079260 100644
--- a/arch/mips/Kconfig
+++ b/arch/mips/Kconfig
@@ -2035,6 +2035,30 @@ 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" if 64BIT
+ default "0x84000000" if 32BIT
+ 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=YM@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
diff --git a/arch/mips/Makefile b/arch/mips/Makefile
index 2f2eac2..431283d 100644
--- a/arch/mips/Makefile
+++ b/arch/mips/Makefile
@@ -646,6 +646,10 @@ 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/
diff --git a/arch/mips/include/asm/kexec.h b/arch/mips/include/asm/kexec.h
index 4314892..e9eba1a 100644
--- a/arch/mips/include/asm/kexec.h
+++ b/arch/mips/include/asm/kexec.h
@@ -9,22 +9,45 @@
#ifndef _MIPS_KEXEC
# define _MIPS_KEXEC
+#include <asm/stacktrace.h>
+
+extern unsigned long long elfcorehdr_addr;
+
/* Maximum physical address we can use pages from */
#define KEXEC_SOURCE_MEMORY_LIMIT (0x20000000)
/* Maximum address we can reach in physical address mode */
#define KEXEC_DESTINATION_MEMORY_LIMIT (0x20000000)
/* Maximum address we can use for the control code buffer */
#define KEXEC_CONTROL_MEMORY_LIMIT (0x20000000)
-
-#define KEXEC_CONTROL_PAGE_SIZE 4096
+/* Reserve 3*4096 bytes for board-specific info */
+#define KEXEC_CONTROL_PAGE_SIZE (4096 + 3*4096)
/* The native architecture */
#define KEXEC_ARCH KEXEC_ARCH_MIPS
+#define MAX_NOTE_BYTES 1024
static inline void crash_setup_regs(struct pt_regs *newregs,
- struct pt_regs *oldregs)
+ 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 */
diff --git a/arch/mips/include/asm/smp.h b/arch/mips/include/asm/smp.h
index af42385..9b50048 100644
--- a/arch/mips/include/asm/smp.h
+++ b/arch/mips/include/asm/smp.h
@@ -40,6 +40,8 @@ extern int __cpu_logical_map[NR_CPUS];
#define SMP_CALL_FUNCTION 0x2
/* Octeon - Tell another core to flush its icache */
#define SMP_ICACHE_FLUSH 0x4
+/* Used by kexec crashdump to save all cpu's state */
+#define SMP_DUMP 0x8
extern volatile cpumask_t cpu_callin_map;
@@ -91,4 +93,9 @@ static inline void arch_send_call_function_ipi_mask(const struct cpumask *mask)
mp_ops->send_ipi_mask(mask, SMP_CALL_FUNCTION);
}
+extern void core_send_ipi(int cpu, unsigned int action);
+#if defined(CONFIG_KEXEC)
+extern void (*dump_ipi_function_ptr)(void *);
+void dump_send_ipi(void (*dump_ipi_callback)(void *));
+#endif
#endif /* __ASM_SMP_H */
diff --git a/arch/mips/kernel/Makefile b/arch/mips/kernel/Makefile
index ef20957..7ae634d 100644
--- a/arch/mips/kernel/Makefile
+++ b/arch/mips/kernel/Makefile
@@ -91,7 +91,8 @@ 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_SPINLOCK_TEST) += spinlock_test.o
diff --git a/arch/mips/kernel/crash.c b/arch/mips/kernel/crash.c
new file mode 100644
index 0000000..24247ea
--- /dev/null
+++ b/arch/mips/kernel/crash.c
@@ -0,0 +1,75 @@
+#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>
+
+#ifdef CONFIG_CRASH_DUMP
+unsigned long long elfcorehdr_addr = ELFCORE_ADDR_MAX;
+#endif
+
+/* 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 */
+
+ dump_send_ipi(crash_shutdown_secondary);
+ smp_wmb();
+
+ /*
+ * The crash CPU sends 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() {}
+#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);
+}
diff --git a/arch/mips/kernel/crash_dump.c b/arch/mips/kernel/crash_dump.c
new file mode 100644
index 0000000..49e5efa
--- /dev/null
+++ b/arch/mips/kernel/crash_dump.c
@@ -0,0 +1,86 @@
+#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);
diff --git a/arch/mips/kernel/machine_kexec.c b/arch/mips/kernel/machine_kexec.c
index 85beb9b..4d25843 100644
--- a/arch/mips/kernel/machine_kexec.c
+++ b/arch/mips/kernel/machine_kexec.c
@@ -19,9 +19,19 @@ extern const size_t relocate_new_kernel_size;
extern unsigned long kexec_start_address;
extern unsigned long kexec_indirection_page;
+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)
{
+ if (_machine_kexec_prepare)
+ return _machine_kexec_prepare(kimage);
return 0;
}
@@ -33,11 +43,17 @@ machine_kexec_cleanup(struct kimage *kimage)
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));
@@ -52,7 +68,9 @@ machine_kexec(struct kimage *image)
reboot_code_buffer =
(unsigned long)page_address(image->control_code_page);
- kexec_start_address = image->start;
+ kexec_start_address =
+ (unsigned long) phys_to_virt(image->start);
+
kexec_indirection_page =
(unsigned long) phys_to_virt(image->head & PAGE_MASK);
@@ -63,7 +81,7 @@ 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) ?
@@ -81,5 +99,13 @@ machine_kexec(struct kimage *image)
printk("Will call new kernel at %08lx\n", image->start);
printk("Bye ...\n");
__flush_cache_all();
+#ifdef CONFIG_SMP
+ /* All secondary cpus now may jump to kexec_wait cycle */
+ relocated_kexec_smp_wait = reboot_code_buffer +
+ (void *)(kexec_smp_wait - relocate_new_kernel);
+ smp_wmb();
+ atomic_set(&kexec_ready_to_reboot, 1);
+#endif
((noretfun_t) reboot_code_buffer)();
}
+
diff --git a/arch/mips/kernel/relocate_kernel.S b/arch/mips/kernel/relocate_kernel.S
index 87481f9..0abaf7a 100644
--- a/arch/mips/kernel/relocate_kernel.S
+++ b/arch/mips/kernel/relocate_kernel.S
@@ -15,6 +15,11 @@
#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 +31,6 @@ 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:
@@ -60,10 +64,92 @@ copy_word:
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
+
+ sync
/* 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
+
+ sync
+ 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
diff --git a/arch/mips/kernel/setup.c b/arch/mips/kernel/setup.c
index f9513f9..d706bd9 100644
--- a/arch/mips/kernel/setup.c
+++ b/arch/mips/kernel/setup.c
@@ -21,6 +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>
@@ -487,10 +488,61 @@ 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
sparse_init();
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)
+ printk(KERN_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
+static void __init mips_parse_crashkernel(void)
+{
+}
+static void __init request_crashkernel(struct resource *res)
+{
+}
+#endif
+
static void __init resource_init(void)
{
int i;
@@ -506,6 +558,8 @@ 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;
@@ -541,6 +595,7 @@ static void __init resource_init(void)
*/
request_resource(res, &code_resource);
request_resource(res, &data_resource);
+ request_crashkernel(res);
}
}
diff --git a/arch/mips/kernel/smp.c b/arch/mips/kernel/smp.c
index 6cdca19..e2f4d53 100644
--- a/arch/mips/kernel/smp.c
+++ b/arch/mips/kernel/smp.c
@@ -402,3 +402,21 @@ 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)
+ core_send_ipi(i, SMP_DUMP);
+
+}
+EXPORT_SYMBOL(dump_send_ipi);
+#endif
+
Signed-off-by: Maxim Uvarov <muvarov@gmail.com>
^ permalink raw reply related [flat|nested] 11+ messages in thread
* [PATCH 1/2] MIPS kexec,kdump support
@ 2010-03-03 11:05 ` Maxim Uvarov
0 siblings, 0 replies; 11+ messages in thread
From: Maxim Uvarov @ 2010-03-03 11:05 UTC (permalink / raw)
To: linux-mips, kexec; +Cc: horms, ralf
Hello folks,
Please find here MIPS crash and kdump patches.
This is patch set of 3 patches:
1. generic MIPS changes (kernel);
2. MIPS Cavium Octeon board kexec/kdump code (kernel);
3. Kexec user space MIPS changes.
Patches were tested on the latest linux-mips@ git kernel and the latest
kexec-tools git on Cavium Octeon 50xx board.
I also made the same code working on RMI XLR/XLS boards for both
mips32 and mips64 kernels.
Best regards,
Maxim Uvarov.
---
arch/mips/Kconfig | 24 ++++++++++
arch/mips/Makefile | 4 ++
arch/mips/include/asm/kexec.h | 31 +++++++++++--
arch/mips/include/asm/smp.h | 7 +++
arch/mips/kernel/Makefile | 3 +
arch/mips/kernel/crash.c | 75 +++++++++++++++++++++++++++++++
arch/mips/kernel/crash_dump.c | 86 +++++++++++++++++++++++++++++++++++
arch/mips/kernel/machine_kexec.c | 30 +++++++++++-
arch/mips/kernel/relocate_kernel.S | 88 ++++++++++++++++++++++++++++++++++++
arch/mips/kernel/setup.c | 55 +++++++++++++++++++++++
arch/mips/kernel/smp.c | 18 +++++++
11 files changed, 413 insertions(+), 8 deletions(-)
create mode 100644 arch/mips/kernel/crash.c
create mode 100644 arch/mips/kernel/crash_dump.c
diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
index 591ca0c..8079260 100644
--- a/arch/mips/Kconfig
+++ b/arch/mips/Kconfig
@@ -2035,6 +2035,30 @@ 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" if 64BIT
+ default "0x84000000" if 32BIT
+ 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=YM@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
diff --git a/arch/mips/Makefile b/arch/mips/Makefile
index 2f2eac2..431283d 100644
--- a/arch/mips/Makefile
+++ b/arch/mips/Makefile
@@ -646,6 +646,10 @@ 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/
diff --git a/arch/mips/include/asm/kexec.h b/arch/mips/include/asm/kexec.h
index 4314892..e9eba1a 100644
--- a/arch/mips/include/asm/kexec.h
+++ b/arch/mips/include/asm/kexec.h
@@ -9,22 +9,45 @@
#ifndef _MIPS_KEXEC
# define _MIPS_KEXEC
+#include <asm/stacktrace.h>
+
+extern unsigned long long elfcorehdr_addr;
+
/* Maximum physical address we can use pages from */
#define KEXEC_SOURCE_MEMORY_LIMIT (0x20000000)
/* Maximum address we can reach in physical address mode */
#define KEXEC_DESTINATION_MEMORY_LIMIT (0x20000000)
/* Maximum address we can use for the control code buffer */
#define KEXEC_CONTROL_MEMORY_LIMIT (0x20000000)
-
-#define KEXEC_CONTROL_PAGE_SIZE 4096
+/* Reserve 3*4096 bytes for board-specific info */
+#define KEXEC_CONTROL_PAGE_SIZE (4096 + 3*4096)
/* The native architecture */
#define KEXEC_ARCH KEXEC_ARCH_MIPS
+#define MAX_NOTE_BYTES 1024
static inline void crash_setup_regs(struct pt_regs *newregs,
- struct pt_regs *oldregs)
+ 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 */
diff --git a/arch/mips/include/asm/smp.h b/arch/mips/include/asm/smp.h
index af42385..9b50048 100644
--- a/arch/mips/include/asm/smp.h
+++ b/arch/mips/include/asm/smp.h
@@ -40,6 +40,8 @@ extern int __cpu_logical_map[NR_CPUS];
#define SMP_CALL_FUNCTION 0x2
/* Octeon - Tell another core to flush its icache */
#define SMP_ICACHE_FLUSH 0x4
+/* Used by kexec crashdump to save all cpu's state */
+#define SMP_DUMP 0x8
extern volatile cpumask_t cpu_callin_map;
@@ -91,4 +93,9 @@ static inline void arch_send_call_function_ipi_mask(const struct cpumask *mask)
mp_ops->send_ipi_mask(mask, SMP_CALL_FUNCTION);
}
+extern void core_send_ipi(int cpu, unsigned int action);
+#if defined(CONFIG_KEXEC)
+extern void (*dump_ipi_function_ptr)(void *);
+void dump_send_ipi(void (*dump_ipi_callback)(void *));
+#endif
#endif /* __ASM_SMP_H */
diff --git a/arch/mips/kernel/Makefile b/arch/mips/kernel/Makefile
index ef20957..7ae634d 100644
--- a/arch/mips/kernel/Makefile
+++ b/arch/mips/kernel/Makefile
@@ -91,7 +91,8 @@ 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_SPINLOCK_TEST) += spinlock_test.o
diff --git a/arch/mips/kernel/crash.c b/arch/mips/kernel/crash.c
new file mode 100644
index 0000000..24247ea
--- /dev/null
+++ b/arch/mips/kernel/crash.c
@@ -0,0 +1,75 @@
+#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>
+
+#ifdef CONFIG_CRASH_DUMP
+unsigned long long elfcorehdr_addr = ELFCORE_ADDR_MAX;
+#endif
+
+/* 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 */
+
+ dump_send_ipi(crash_shutdown_secondary);
+ smp_wmb();
+
+ /*
+ * The crash CPU sends 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() {}
+#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);
+}
diff --git a/arch/mips/kernel/crash_dump.c b/arch/mips/kernel/crash_dump.c
new file mode 100644
index 0000000..49e5efa
--- /dev/null
+++ b/arch/mips/kernel/crash_dump.c
@@ -0,0 +1,86 @@
+#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);
diff --git a/arch/mips/kernel/machine_kexec.c b/arch/mips/kernel/machine_kexec.c
index 85beb9b..4d25843 100644
--- a/arch/mips/kernel/machine_kexec.c
+++ b/arch/mips/kernel/machine_kexec.c
@@ -19,9 +19,19 @@ extern const size_t relocate_new_kernel_size;
extern unsigned long kexec_start_address;
extern unsigned long kexec_indirection_page;
+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)
{
+ if (_machine_kexec_prepare)
+ return _machine_kexec_prepare(kimage);
return 0;
}
@@ -33,11 +43,17 @@ machine_kexec_cleanup(struct kimage *kimage)
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));
@@ -52,7 +68,9 @@ machine_kexec(struct kimage *image)
reboot_code_buffer =
(unsigned long)page_address(image->control_code_page);
- kexec_start_address = image->start;
+ kexec_start_address =
+ (unsigned long) phys_to_virt(image->start);
+
kexec_indirection_page =
(unsigned long) phys_to_virt(image->head & PAGE_MASK);
@@ -63,7 +81,7 @@ 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) ?
@@ -81,5 +99,13 @@ machine_kexec(struct kimage *image)
printk("Will call new kernel at %08lx\n", image->start);
printk("Bye ...\n");
__flush_cache_all();
+#ifdef CONFIG_SMP
+ /* All secondary cpus now may jump to kexec_wait cycle */
+ relocated_kexec_smp_wait = reboot_code_buffer +
+ (void *)(kexec_smp_wait - relocate_new_kernel);
+ smp_wmb();
+ atomic_set(&kexec_ready_to_reboot, 1);
+#endif
((noretfun_t) reboot_code_buffer)();
}
+
diff --git a/arch/mips/kernel/relocate_kernel.S b/arch/mips/kernel/relocate_kernel.S
index 87481f9..0abaf7a 100644
--- a/arch/mips/kernel/relocate_kernel.S
+++ b/arch/mips/kernel/relocate_kernel.S
@@ -15,6 +15,11 @@
#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 +31,6 @@ 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:
@@ -60,10 +64,92 @@ copy_word:
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
+
+ sync
/* 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
+
+ sync
+ 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
diff --git a/arch/mips/kernel/setup.c b/arch/mips/kernel/setup.c
index f9513f9..d706bd9 100644
--- a/arch/mips/kernel/setup.c
+++ b/arch/mips/kernel/setup.c
@@ -21,6 +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>
@@ -487,10 +488,61 @@ 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
sparse_init();
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)
+ printk(KERN_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
+static void __init mips_parse_crashkernel(void)
+{
+}
+static void __init request_crashkernel(struct resource *res)
+{
+}
+#endif
+
static void __init resource_init(void)
{
int i;
@@ -506,6 +558,8 @@ 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;
@@ -541,6 +595,7 @@ static void __init resource_init(void)
*/
request_resource(res, &code_resource);
request_resource(res, &data_resource);
+ request_crashkernel(res);
}
}
diff --git a/arch/mips/kernel/smp.c b/arch/mips/kernel/smp.c
index 6cdca19..e2f4d53 100644
--- a/arch/mips/kernel/smp.c
+++ b/arch/mips/kernel/smp.c
@@ -402,3 +402,21 @@ 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)
+ core_send_ipi(i, SMP_DUMP);
+
+}
+EXPORT_SYMBOL(dump_send_ipi);
+#endif
+
Signed-off-by: Maxim Uvarov <muvarov@gmail.com>
_______________________________________________
kexec mailing list
kexec@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/kexec
^ permalink raw reply related [flat|nested] 11+ messages in thread
* [PATCH 2/2] MIPS Cavium Octeon board kexec,kdump support
2010-03-03 11:05 ` Maxim Uvarov
@ 2010-03-03 11:05 ` Maxim Uvarov
-1 siblings, 0 replies; 11+ messages in thread
From: Maxim Uvarov @ 2010-03-03 11:05 UTC (permalink / raw)
To: linux-mips, kexec; +Cc: horms, ralf
Hello folks,
Please find here MIPS crash and kdump patches.
This is patch set of 3 patches:
1. generic MIPS changes (kernel);
2. MIPS Cavium Octeon board kexec/kdump code (kernel);
3. Kexec user space MIPS changes.
Patches were tested on the latest linux-mips@ git kernel and the latest
kexec-tools git on Cavium Octeon 50xx board.
I also made the same code working on RMI XLR/XLS boards for both
mips32 and mips64 kernels.
Best regards,
Maxim Uvarov.
---
arch/mips/cavium-octeon/dma-octeon.c | 6
arch/mips/cavium-octeon/executive/cvmx-bootmem.c | 5
arch/mips/cavium-octeon/setup.c | 309 +++++++++++++++++++++-
arch/mips/cavium-octeon/smp.c | 5
arch/mips/include/asm/octeon/cvmx-bootmem.h | 2
arch/mips/kernel/relocate_kernel.S | 19 +
6 files changed, 326 insertions(+), 20 deletions(-)
diff --git a/arch/mips/cavium-octeon/dma-octeon.c b/arch/mips/cavium-octeon/dma-octeon.c
index be531ec..679d7b5 100644
--- a/arch/mips/cavium-octeon/dma-octeon.c
+++ b/arch/mips/cavium-octeon/dma-octeon.c
@@ -105,7 +105,8 @@ dma_addr_t octeon_map_dma_mem(struct device *dev, void *ptr, size_t size)
pr_warning("dma_map_single: Warning: "
"Mapping memory address that might "
"conflict with devices 0x%llx-0x%llx\n",
- physical, physical+size-1);
+ (unsigned long long) physical,
+ (unsigned long long) (physical + size - 1));
/* The 2nd 256MB is mapped at 256<<20 instead of 0x410000000 */
if ((physical >= 0x410000000ull) && physical < 0x420000000ull)
result = physical - 0x400000000ull;
@@ -115,7 +116,8 @@ dma_addr_t octeon_map_dma_mem(struct device *dev, void *ptr, size_t size)
panic("dma_map_single: Attempt to map address "
"0x%llx-0x%llx, which can't be accessed "
"according to the dma mask 0x%llx\n",
- physical, physical+size-1, dma_mask);
+ physical, (unsigned long long)(physical+size-1),
+ dma_mask);
goto done;
case OCTEON_DMA_BAR_TYPE_BIG:
diff --git a/arch/mips/cavium-octeon/executive/cvmx-bootmem.c b/arch/mips/cavium-octeon/executive/cvmx-bootmem.c
index fdf5f19..1ae35ec 100644
--- a/arch/mips/cavium-octeon/executive/cvmx-bootmem.c
+++ b/arch/mips/cavium-octeon/executive/cvmx-bootmem.c
@@ -688,3 +688,8 @@ int64_t cvmx_bootmem_phy_named_block_alloc(uint64_t size, uint64_t min_addr,
cvmx_spinlock_unlock((cvmx_spinlock_t *)&(cvmx_bootmem_desc->lock));
return addr_allocated;
}
+
+void *cvmx_bootmem_get_desc(void)
+{
+ return cvmx_bootmem_desc;
+}
diff --git a/arch/mips/cavium-octeon/setup.c b/arch/mips/cavium-octeon/setup.c
index b321d3b..2f246d2 100644
--- a/arch/mips/cavium-octeon/setup.c
+++ b/arch/mips/cavium-octeon/setup.c
@@ -20,6 +20,7 @@
#include <linux/platform_device.h>
#include <linux/serial_core.h>
#include <linux/serial_8250.h>
+#include <linux/kexec.h>
#include <asm/processor.h>
#include <asm/reboot.h>
@@ -55,11 +56,205 @@ struct octeon_boot_descriptor *octeon_boot_desc_ptr;
struct cvmx_bootinfo *octeon_bootinfo;
EXPORT_SYMBOL(octeon_bootinfo);
+static unsigned long long RESERVE_LOW_MEM = 0ull;
+#ifdef CONFIG_KEXEC
+#ifdef CONFIG_SMP
+/*
+ * Wait for relocation code is prepared and send
+ * secondary CPUs to spin until kernel is relocated.
+ */
+void octeon_kexec_smp_down(void *ignored)
+{
+ int cpu = smp_processor_id();
+ local_irq_disable();
+ cpu_clear(cpu, cpu_online_map);
+ while (!atomic_read(&kexec_ready_to_reboot))
+ cpu_relax();
+ asm volatile ("synci 0($0)\n");
+ relocated_kexec_smp_wait(NULL);
+}
+#endif
+
+#define OCTEON_DDR0_BASE (0x0ULL)
+#define OCTEON_DDR0_SIZE (0x010000000ULL)
+#define OCTEON_DDR1_BASE (0x410000000ULL)
+#define OCTEON_DDR1_SIZE (0x010000000ULL)
+#define OCTEON_DDR2_BASE (0x020000000ULL)
+#define OCTEON_DDR2_SIZE (0x3e0000000ULL)
+#define OCTEON_MAX_PHY_MEM_SIZE (16*1024*1024*1024ULL)
+
+static struct kimage *kimage_ptr;
+
+static void kexec_bootmem_init(uint64_t mem_size, uint32_t low_reserved_bytes)
+{
+ int64_t addr;
+ struct cvmx_bootmem_desc *bootmem_desc;
+
+ bootmem_desc =
+ (struct cvmx_bootmem_desc *)cvmx_bootmem_get_desc();
+
+ if (mem_size > OCTEON_MAX_PHY_MEM_SIZE) {
+ mem_size = OCTEON_MAX_PHY_MEM_SIZE;
+ printk(KERN_ERR "ERROR: requested memory size too large,"
+ "truncating to maximum size\n");
+ }
+
+ bootmem_desc->major_version = CVMX_BOOTMEM_DESC_MAJ_VER;
+ bootmem_desc->minor_version = CVMX_BOOTMEM_DESC_MIN_VER;
+
+ addr = (OCTEON_DDR0_BASE + RESERVE_LOW_MEM + low_reserved_bytes);
+ bootmem_desc->head_addr = 0;
+
+ if (mem_size <= OCTEON_DDR0_SIZE) {
+ __cvmx_bootmem_phy_free(addr,
+ mem_size - RESERVE_LOW_MEM -
+ low_reserved_bytes, 0);
+ return;
+ }
+
+ __cvmx_bootmem_phy_free(addr,
+ OCTEON_DDR0_SIZE - RESERVE_LOW_MEM -
+ low_reserved_bytes, 0);
+
+ mem_size -= OCTEON_DDR0_SIZE;
+
+ if (mem_size > OCTEON_DDR1_SIZE) {
+ __cvmx_bootmem_phy_free(OCTEON_DDR1_BASE, OCTEON_DDR1_SIZE, 0);
+ __cvmx_bootmem_phy_free(OCTEON_DDR2_BASE,
+ mem_size - OCTEON_DDR1_SIZE, 0);
+ } else
+ __cvmx_bootmem_phy_free(OCTEON_DDR1_BASE, mem_size, 0);
+}
+
+int octeon_kexec_prepare(struct kimage *image)
+{
+ int i;
+ char *bootloader = "kexec";
+
+ octeon_boot_desc_ptr->argc = 0;
+ for (i = 0; i < image->nr_segments; i++) {
+ if (!strncmp(bootloader, (char *)image->segment[i].buf,
+ strlen(bootloader))) {
+ /*
+ * convert command line string to array
+ * of parameters (as bootloader does).
+ */
+ int argc = 0, offt;
+ char *str = (char *)image->segment[i].buf;
+ char *ptr = strchr(str, ' ');
+ while (ptr && (OCTEON_ARGV_MAX_ARGS > argc)) {
+ *ptr = '\0';
+ if (ptr[1] != ' ') {
+ offt = (int)(ptr - str + 1);
+ octeon_boot_desc_ptr->argv[argc] =
+ image->segment[i].mem + offt;
+ argc++;
+ }
+ ptr = strchr(ptr + 1, ' ');
+ }
+ octeon_boot_desc_ptr->argc = argc;
+ break;
+ }
+ }
+
+ /*
+ * Information about segments will be needed during pre-boot memory
+ * initialization.
+ */
+ kimage_ptr = image;
+ return 0;
+}
+
+static void octeon_generic_shutdown(void)
+{
+ int cpu, i;
+ struct cvmx_bootmem_desc *bootmem_desc;
+ void *named_block_array_ptr;
+
+ bootmem_desc =
+ (struct cvmx_bootmem_desc *)cvmx_bootmem_get_desc();
+ named_block_array_ptr =
+ cvmx_phys_to_ptr(bootmem_desc->named_block_array_addr);
+
+#ifdef CONFIG_SMP
+ /* disable watchdogs */
+ for_each_online_cpu(cpu)
+ cvmx_write_csr(CVMX_CIU_WDOGX(cpu_logical_map(cpu)), 0);
+#else
+ cvmx_write_csr(CVMX_CIU_WDOGX(cvmx_get_core_num()), 0);
+#endif
+ if (kimage_ptr != kexec_crash_image) {
+ memset(named_block_array_ptr,
+ 0x0,
+ CVMX_BOOTMEM_NUM_NAMED_BLOCKS *
+ sizeof(struct cvmx_bootmem_named_block_desc));
+ /*
+ * Mark all memory (except low 0x100000 bytes) as free.
+ * It is the same thing that bootloader does.
+ */
+ kexec_bootmem_init(octeon_bootinfo->dram_size*1024ULL*1024ULL,
+ 0x100000);
+ /*
+ * Allocate all segments to avoid their corruption during boot.
+ */
+ for (i = 0; i < kimage_ptr->nr_segments; i++)
+ cvmx_bootmem_alloc_address(
+ kimage_ptr->segment[i].memsz + 2*PAGE_SIZE,
+ kimage_ptr->segment[i].mem - PAGE_SIZE,
+ PAGE_SIZE);
+ } else {
+ /*
+ * Do not mark all memory as free. Free only named sections
+ * leaving the rest of memory unchanged.
+ */
+ struct cvmx_bootmem_named_block_desc *ptr =
+ (struct cvmx_bootmem_named_block_desc *)
+ named_block_array_ptr;
+
+ for (i = 0; i < bootmem_desc->named_block_num_blocks; i++)
+ if (ptr[i].size)
+ cvmx_bootmem_free_named(ptr[i].name);
+ }
+ kexec_args[2] = 1UL; /* running on octeon_main_processor */
+ kexec_args[3] = (unsigned long)octeon_boot_desc_ptr;
+#ifdef CONFIG_SMP
+ secondary_kexec_args[2] = 0UL; /* running on secondary cpu */
+ secondary_kexec_args[3] = (unsigned long)octeon_boot_desc_ptr;
+#endif
+}
+
+void octeon_shutdown(void)
+{
+ octeon_generic_shutdown();
+#ifdef CONFIG_SMP
+ smp_call_function(octeon_kexec_smp_down, NULL, 0);
+ smp_wmb();
+ while (num_online_cpus() > 1) {
+ cpu_relax();
+ mdelay(1);
+ }
+#endif
+}
+
+void octeon_crash_shutdown(struct pt_regs *regs)
+{
+ octeon_generic_shutdown();
+ default_machine_crash_shutdown(regs);
+}
+
+#endif
+
#ifdef CONFIG_CAVIUM_RESERVE32
uint64_t octeon_reserve32_memory;
EXPORT_SYMBOL(octeon_reserve32_memory);
#endif
+#ifdef CONFIG_KEXEC
+/* crashkernel cmdline parameter is parsed _after_ memory setup
+ * we also parse it here (workaround for EHB5200) */
+static uint64_t crashk_size, crashk_base;
+#endif
+
static int octeon_uart;
extern asmlinkage void handle_int(void);
@@ -467,6 +662,8 @@ void __init prom_init(void)
int i;
int argc;
struct uart_port octeon_port;
+ char *p;
+ const char *arg;
#ifdef CONFIG_CAVIUM_RESERVE32
int64_t addr = -1;
#endif
@@ -629,6 +826,15 @@ void __init prom_init(void)
if (octeon_is_simulation())
MAX_MEMORY = 64ull << 20;
+ arg = strstr(arcs_cmdline, "mem=");
+ if (arg) {
+ MAX_MEMORY = memparse(arg + 4, &p);
+ if (MAX_MEMORY == 0)
+ MAX_MEMORY = 32ull << 30;
+ if (*p == '@')
+ RESERVE_LOW_MEM = memparse(p + 1, &p);
+ }
+
arcs_cmdline[0] = 0;
argc = octeon_boot_desc_ptr->argc;
for (i = 0; i < argc; i++) {
@@ -636,16 +842,25 @@ void __init prom_init(void)
cvmx_phys_to_ptr(octeon_boot_desc_ptr->argv[i]);
if ((strncmp(arg, "MEM=", 4) == 0) ||
(strncmp(arg, "mem=", 4) == 0)) {
- sscanf(arg + 4, "%llu", &MAX_MEMORY);
- MAX_MEMORY <<= 20;
+ MAX_MEMORY = memparse(arg + 4, &p);
if (MAX_MEMORY == 0)
MAX_MEMORY = 32ull << 30;
+ if (*p == '@')
+ RESERVE_LOW_MEM = memparse(p + 1, &p);
} else if (strcmp(arg, "ecc_verbose") == 0) {
#ifdef CONFIG_CAVIUM_REPORT_SINGLE_BIT_ECC
__cvmx_interrupt_ecc_report_single_bit_errors = 1;
pr_notice("Reporting of single bit ECC errors is "
"turned on\n");
#endif
+#ifdef CONFIG_KEXEC
+ } else if (strncmp(arg, "crashkernel=", 12) == 0) {
+ crashk_size = memparse(arg+12, &p);
+ if (*p == '@')
+ crashk_base = memparse(p+1, &p);
+ strcat(arcs_cmdline, " ");
+ strcat(arcs_cmdline, arg);
+#endif
} else if (strlen(arcs_cmdline) + strlen(arg) + 1 <
sizeof(arcs_cmdline) - 1) {
strcat(arcs_cmdline, " ");
@@ -685,6 +900,12 @@ void __init prom_init(void)
_machine_restart = octeon_restart;
_machine_halt = octeon_halt;
+#ifdef CONFIG_KEXEC
+ _machine_kexec_shutdown = octeon_shutdown;
+ _machine_crash_shutdown = octeon_crash_shutdown;
+ _machine_kexec_prepare = octeon_kexec_prepare;
+#endif
+
memset(&octeon_port, 0, sizeof(octeon_port));
/*
* For early_serial_setup we don't set the port type or
@@ -717,17 +938,15 @@ void __init plat_mem_setup(void)
{
uint64_t mem_alloc_size;
uint64_t total;
+ uint64_t crashk_end;
+#ifndef CONFIG_CRASH_DUMP
int64_t memory;
+ uint64_t kernel_start;
+ uint64_t kernel_size;
+#endif
total = 0;
-
- /* First add the init memory we will be returning. */
- memory = __pa_symbol(&__init_begin) & PAGE_MASK;
- mem_alloc_size = (__pa_symbol(&__init_end) & PAGE_MASK) - memory;
- if (mem_alloc_size > 0) {
- add_memory_region(memory, mem_alloc_size, BOOT_MEM_RAM);
- total += mem_alloc_size;
- }
+ crashk_end = 0;
/*
* The Mips memory init uses the first memory location for
@@ -740,6 +959,17 @@ void __init plat_mem_setup(void)
if (mem_alloc_size > MAX_MEMORY)
mem_alloc_size = MAX_MEMORY;
+/* Crashkernel ignores bootmem list. It relies on mem=X@Y option */
+#ifdef CONFIG_CRASH_DUMP
+ add_memory_region(RESERVE_LOW_MEM, MAX_MEMORY, BOOT_MEM_RAM);
+ total += MAX_MEMORY;
+#else
+#ifdef CONFIG_KEXEC
+ if (crashk_size > 0) {
+ add_memory_region(crashk_base, crashk_size, BOOT_MEM_RAM);
+ crashk_end = crashk_base + crashk_size;
+ }
+#endif
/*
* When allocating memory, we want incrementing addresses from
* bootmem_alloc so the code in add_memory_region can merge
@@ -750,9 +980,10 @@ void __init plat_mem_setup(void)
&& (total < MAX_MEMORY)) {
#if defined(CONFIG_64BIT) || defined(CONFIG_64BIT_PHYS_ADDR)
memory = cvmx_bootmem_phy_alloc(mem_alloc_size,
- __pa_symbol(&__init_end), -1,
- 0x100000,
+ RESERVE_LOW_MEM,
+ /*-1*/0, 0x100000,
CVMX_BOOTMEM_FLAG_NO_LOCKING);
+
#elif defined(CONFIG_HIGHMEM)
memory = cvmx_bootmem_phy_alloc(mem_alloc_size, 0, 1ull << 31,
0x100000,
@@ -763,19 +994,61 @@ void __init plat_mem_setup(void)
CVMX_BOOTMEM_FLAG_NO_LOCKING);
#endif
if (memory >= 0) {
- /*
- * This function automatically merges address
- * regions next to each other if they are
- * received in incrementing order.
- */
- add_memory_region(memory, mem_alloc_size, BOOT_MEM_RAM);
+#ifdef CONFIG_KEXEC
+ uint64_t end = memory + mem_alloc_size;
+ /* This function automatically merges address
+ regions next to each other if they are
+ received in incrementing order */
+ if (memory < crashk_base && end > crashk_end) {
+ /* region is fully in */
+ add_memory_region(memory,
+ crashk_base - memory,
+ BOOT_MEM_RAM);
+ total += crashk_base - memory;
+ add_memory_region(crashk_end,
+ end - crashk_end,
+ BOOT_MEM_RAM);
+ total += end - crashk_end;
+ continue;
+ }
+
+ if (memory >= crashk_base && end <= crashk_end)
+ /* Entire memory region is within the
+ * new kernel's memory, ignore it. */
+ continue;
+
+ if (memory > crashk_base && memory < crashk_end &&
+ end > crashk_end) {
+ /* Overlap with the beginning of the
+ * region, reserve the beginning. */
+ mem_alloc_size -= crashk_end - memory;
+ memory = crashk_end;
+ } else if (memory < crashk_base && end > crashk_base &&
+ end < crashk_end)
+ /* Overlap with the beginning of the
+ * region, chop of end. */
+ mem_alloc_size -= end - crashk_base;
+#endif
+ add_memory_region(memory, mem_alloc_size,
+ BOOT_MEM_RAM);
total += mem_alloc_size;
+
+ /* Recovering mem_alloc_size */
+ mem_alloc_size = 4 << 20;
} else {
break;
}
}
cvmx_bootmem_unlock();
+ /* Add the memory region for the kernel. */
+ kernel_start = (unsigned long) _text;
+ kernel_size = ALIGN(_end - _text, 0x100000);
+
+ /* Adjust for physical offset. */
+ kernel_start &= ~0xffffffff80000000ULL;
+ add_memory_region(kernel_start, kernel_size, BOOT_MEM_RAM);
+#endif /* CONFIG_CRASH_DUMP */
#ifdef CONFIG_CAVIUM_RESERVE32
/*
* Now that we've allocated the kernel memory it is safe to
diff --git a/arch/mips/cavium-octeon/smp.c b/arch/mips/cavium-octeon/smp.c
index 51e9802..06fe291 100644
--- a/arch/mips/cavium-octeon/smp.c
+++ b/arch/mips/cavium-octeon/smp.c
@@ -65,6 +65,11 @@ void octeon_send_ipi_single(int cpu, unsigned int action)
cvmx_write_csr(CVMX_CIU_MBOX_SETX(coreid), action);
}
+void core_send_ipi(int cpu, unsigned int action)
+{
+ octeon_send_ipi_single(cpu, action);
+}
+
static inline void octeon_send_ipi_mask(const struct cpumask *mask,
unsigned int action)
{
diff --git a/arch/mips/include/asm/octeon/cvmx-bootmem.h b/arch/mips/include/asm/octeon/cvmx-bootmem.h
index 8e708bd..2f3cb9f 100644
--- a/arch/mips/include/asm/octeon/cvmx-bootmem.h
+++ b/arch/mips/include/asm/octeon/cvmx-bootmem.h
@@ -370,4 +370,6 @@ void cvmx_bootmem_lock(void);
*/
void cvmx_bootmem_unlock(void);
+void *cvmx_bootmem_get_desc(void);
+
#endif /* __CVMX_BOOTMEM_H__ */
diff --git a/arch/mips/kernel/relocate_kernel.S b/arch/mips/kernel/relocate_kernel.S
index 0abaf7a..961c10b 100644
--- a/arch/mips/kernel/relocate_kernel.S
+++ b/arch/mips/kernel/relocate_kernel.S
@@ -78,7 +78,19 @@ done:
LONG_S zero,(t0)
#endif
+#ifdef CONFIG_CPU_CAVIUM_OCTEON
+ /* We need to flush I-cache before jumping to new kernel.
+ * Unfortunatelly, this code is cpu-specific.
+ */
+ .set push
+ .set noreorder
+ syncw
+ syncw
+ synci 0($0)
+ .set pop
+#else
sync
+#endif
/* jump to kexec_start_address */
j s1
END(relocate_new_kernel)
@@ -110,7 +122,14 @@ LEAF(kexec_smp_wait)
1: LONG_L s0, (t0)
bne s0, zero,1b
+#ifdef CONFIG_CPU_CAVIUM_OCTEON
+ .set push
+ .set noreorder
+ synci 0($0)
+ .set pop
+#else
sync
+#endif
j s1
END(kexec_smp_wait)
#endif
Signed-off-by: Maxim Uvarov <muvarov@gmail.com>
^ permalink raw reply related [flat|nested] 11+ messages in thread
* [PATCH 2/2] MIPS Cavium Octeon board kexec,kdump support
@ 2010-03-03 11:05 ` Maxim Uvarov
0 siblings, 0 replies; 11+ messages in thread
From: Maxim Uvarov @ 2010-03-03 11:05 UTC (permalink / raw)
To: linux-mips, kexec; +Cc: horms, ralf
Hello folks,
Please find here MIPS crash and kdump patches.
This is patch set of 3 patches:
1. generic MIPS changes (kernel);
2. MIPS Cavium Octeon board kexec/kdump code (kernel);
3. Kexec user space MIPS changes.
Patches were tested on the latest linux-mips@ git kernel and the latest
kexec-tools git on Cavium Octeon 50xx board.
I also made the same code working on RMI XLR/XLS boards for both
mips32 and mips64 kernels.
Best regards,
Maxim Uvarov.
---
arch/mips/cavium-octeon/dma-octeon.c | 6
arch/mips/cavium-octeon/executive/cvmx-bootmem.c | 5
arch/mips/cavium-octeon/setup.c | 309 +++++++++++++++++++++-
arch/mips/cavium-octeon/smp.c | 5
arch/mips/include/asm/octeon/cvmx-bootmem.h | 2
arch/mips/kernel/relocate_kernel.S | 19 +
6 files changed, 326 insertions(+), 20 deletions(-)
diff --git a/arch/mips/cavium-octeon/dma-octeon.c b/arch/mips/cavium-octeon/dma-octeon.c
index be531ec..679d7b5 100644
--- a/arch/mips/cavium-octeon/dma-octeon.c
+++ b/arch/mips/cavium-octeon/dma-octeon.c
@@ -105,7 +105,8 @@ dma_addr_t octeon_map_dma_mem(struct device *dev, void *ptr, size_t size)
pr_warning("dma_map_single: Warning: "
"Mapping memory address that might "
"conflict with devices 0x%llx-0x%llx\n",
- physical, physical+size-1);
+ (unsigned long long) physical,
+ (unsigned long long) (physical + size - 1));
/* The 2nd 256MB is mapped at 256<<20 instead of 0x410000000 */
if ((physical >= 0x410000000ull) && physical < 0x420000000ull)
result = physical - 0x400000000ull;
@@ -115,7 +116,8 @@ dma_addr_t octeon_map_dma_mem(struct device *dev, void *ptr, size_t size)
panic("dma_map_single: Attempt to map address "
"0x%llx-0x%llx, which can't be accessed "
"according to the dma mask 0x%llx\n",
- physical, physical+size-1, dma_mask);
+ physical, (unsigned long long)(physical+size-1),
+ dma_mask);
goto done;
case OCTEON_DMA_BAR_TYPE_BIG:
diff --git a/arch/mips/cavium-octeon/executive/cvmx-bootmem.c b/arch/mips/cavium-octeon/executive/cvmx-bootmem.c
index fdf5f19..1ae35ec 100644
--- a/arch/mips/cavium-octeon/executive/cvmx-bootmem.c
+++ b/arch/mips/cavium-octeon/executive/cvmx-bootmem.c
@@ -688,3 +688,8 @@ int64_t cvmx_bootmem_phy_named_block_alloc(uint64_t size, uint64_t min_addr,
cvmx_spinlock_unlock((cvmx_spinlock_t *)&(cvmx_bootmem_desc->lock));
return addr_allocated;
}
+
+void *cvmx_bootmem_get_desc(void)
+{
+ return cvmx_bootmem_desc;
+}
diff --git a/arch/mips/cavium-octeon/setup.c b/arch/mips/cavium-octeon/setup.c
index b321d3b..2f246d2 100644
--- a/arch/mips/cavium-octeon/setup.c
+++ b/arch/mips/cavium-octeon/setup.c
@@ -20,6 +20,7 @@
#include <linux/platform_device.h>
#include <linux/serial_core.h>
#include <linux/serial_8250.h>
+#include <linux/kexec.h>
#include <asm/processor.h>
#include <asm/reboot.h>
@@ -55,11 +56,205 @@ struct octeon_boot_descriptor *octeon_boot_desc_ptr;
struct cvmx_bootinfo *octeon_bootinfo;
EXPORT_SYMBOL(octeon_bootinfo);
+static unsigned long long RESERVE_LOW_MEM = 0ull;
+#ifdef CONFIG_KEXEC
+#ifdef CONFIG_SMP
+/*
+ * Wait for relocation code is prepared and send
+ * secondary CPUs to spin until kernel is relocated.
+ */
+void octeon_kexec_smp_down(void *ignored)
+{
+ int cpu = smp_processor_id();
+ local_irq_disable();
+ cpu_clear(cpu, cpu_online_map);
+ while (!atomic_read(&kexec_ready_to_reboot))
+ cpu_relax();
+ asm volatile ("synci 0($0)\n");
+ relocated_kexec_smp_wait(NULL);
+}
+#endif
+
+#define OCTEON_DDR0_BASE (0x0ULL)
+#define OCTEON_DDR0_SIZE (0x010000000ULL)
+#define OCTEON_DDR1_BASE (0x410000000ULL)
+#define OCTEON_DDR1_SIZE (0x010000000ULL)
+#define OCTEON_DDR2_BASE (0x020000000ULL)
+#define OCTEON_DDR2_SIZE (0x3e0000000ULL)
+#define OCTEON_MAX_PHY_MEM_SIZE (16*1024*1024*1024ULL)
+
+static struct kimage *kimage_ptr;
+
+static void kexec_bootmem_init(uint64_t mem_size, uint32_t low_reserved_bytes)
+{
+ int64_t addr;
+ struct cvmx_bootmem_desc *bootmem_desc;
+
+ bootmem_desc =
+ (struct cvmx_bootmem_desc *)cvmx_bootmem_get_desc();
+
+ if (mem_size > OCTEON_MAX_PHY_MEM_SIZE) {
+ mem_size = OCTEON_MAX_PHY_MEM_SIZE;
+ printk(KERN_ERR "ERROR: requested memory size too large,"
+ "truncating to maximum size\n");
+ }
+
+ bootmem_desc->major_version = CVMX_BOOTMEM_DESC_MAJ_VER;
+ bootmem_desc->minor_version = CVMX_BOOTMEM_DESC_MIN_VER;
+
+ addr = (OCTEON_DDR0_BASE + RESERVE_LOW_MEM + low_reserved_bytes);
+ bootmem_desc->head_addr = 0;
+
+ if (mem_size <= OCTEON_DDR0_SIZE) {
+ __cvmx_bootmem_phy_free(addr,
+ mem_size - RESERVE_LOW_MEM -
+ low_reserved_bytes, 0);
+ return;
+ }
+
+ __cvmx_bootmem_phy_free(addr,
+ OCTEON_DDR0_SIZE - RESERVE_LOW_MEM -
+ low_reserved_bytes, 0);
+
+ mem_size -= OCTEON_DDR0_SIZE;
+
+ if (mem_size > OCTEON_DDR1_SIZE) {
+ __cvmx_bootmem_phy_free(OCTEON_DDR1_BASE, OCTEON_DDR1_SIZE, 0);
+ __cvmx_bootmem_phy_free(OCTEON_DDR2_BASE,
+ mem_size - OCTEON_DDR1_SIZE, 0);
+ } else
+ __cvmx_bootmem_phy_free(OCTEON_DDR1_BASE, mem_size, 0);
+}
+
+int octeon_kexec_prepare(struct kimage *image)
+{
+ int i;
+ char *bootloader = "kexec";
+
+ octeon_boot_desc_ptr->argc = 0;
+ for (i = 0; i < image->nr_segments; i++) {
+ if (!strncmp(bootloader, (char *)image->segment[i].buf,
+ strlen(bootloader))) {
+ /*
+ * convert command line string to array
+ * of parameters (as bootloader does).
+ */
+ int argc = 0, offt;
+ char *str = (char *)image->segment[i].buf;
+ char *ptr = strchr(str, ' ');
+ while (ptr && (OCTEON_ARGV_MAX_ARGS > argc)) {
+ *ptr = '\0';
+ if (ptr[1] != ' ') {
+ offt = (int)(ptr - str + 1);
+ octeon_boot_desc_ptr->argv[argc] =
+ image->segment[i].mem + offt;
+ argc++;
+ }
+ ptr = strchr(ptr + 1, ' ');
+ }
+ octeon_boot_desc_ptr->argc = argc;
+ break;
+ }
+ }
+
+ /*
+ * Information about segments will be needed during pre-boot memory
+ * initialization.
+ */
+ kimage_ptr = image;
+ return 0;
+}
+
+static void octeon_generic_shutdown(void)
+{
+ int cpu, i;
+ struct cvmx_bootmem_desc *bootmem_desc;
+ void *named_block_array_ptr;
+
+ bootmem_desc =
+ (struct cvmx_bootmem_desc *)cvmx_bootmem_get_desc();
+ named_block_array_ptr =
+ cvmx_phys_to_ptr(bootmem_desc->named_block_array_addr);
+
+#ifdef CONFIG_SMP
+ /* disable watchdogs */
+ for_each_online_cpu(cpu)
+ cvmx_write_csr(CVMX_CIU_WDOGX(cpu_logical_map(cpu)), 0);
+#else
+ cvmx_write_csr(CVMX_CIU_WDOGX(cvmx_get_core_num()), 0);
+#endif
+ if (kimage_ptr != kexec_crash_image) {
+ memset(named_block_array_ptr,
+ 0x0,
+ CVMX_BOOTMEM_NUM_NAMED_BLOCKS *
+ sizeof(struct cvmx_bootmem_named_block_desc));
+ /*
+ * Mark all memory (except low 0x100000 bytes) as free.
+ * It is the same thing that bootloader does.
+ */
+ kexec_bootmem_init(octeon_bootinfo->dram_size*1024ULL*1024ULL,
+ 0x100000);
+ /*
+ * Allocate all segments to avoid their corruption during boot.
+ */
+ for (i = 0; i < kimage_ptr->nr_segments; i++)
+ cvmx_bootmem_alloc_address(
+ kimage_ptr->segment[i].memsz + 2*PAGE_SIZE,
+ kimage_ptr->segment[i].mem - PAGE_SIZE,
+ PAGE_SIZE);
+ } else {
+ /*
+ * Do not mark all memory as free. Free only named sections
+ * leaving the rest of memory unchanged.
+ */
+ struct cvmx_bootmem_named_block_desc *ptr =
+ (struct cvmx_bootmem_named_block_desc *)
+ named_block_array_ptr;
+
+ for (i = 0; i < bootmem_desc->named_block_num_blocks; i++)
+ if (ptr[i].size)
+ cvmx_bootmem_free_named(ptr[i].name);
+ }
+ kexec_args[2] = 1UL; /* running on octeon_main_processor */
+ kexec_args[3] = (unsigned long)octeon_boot_desc_ptr;
+#ifdef CONFIG_SMP
+ secondary_kexec_args[2] = 0UL; /* running on secondary cpu */
+ secondary_kexec_args[3] = (unsigned long)octeon_boot_desc_ptr;
+#endif
+}
+
+void octeon_shutdown(void)
+{
+ octeon_generic_shutdown();
+#ifdef CONFIG_SMP
+ smp_call_function(octeon_kexec_smp_down, NULL, 0);
+ smp_wmb();
+ while (num_online_cpus() > 1) {
+ cpu_relax();
+ mdelay(1);
+ }
+#endif
+}
+
+void octeon_crash_shutdown(struct pt_regs *regs)
+{
+ octeon_generic_shutdown();
+ default_machine_crash_shutdown(regs);
+}
+
+#endif
+
#ifdef CONFIG_CAVIUM_RESERVE32
uint64_t octeon_reserve32_memory;
EXPORT_SYMBOL(octeon_reserve32_memory);
#endif
+#ifdef CONFIG_KEXEC
+/* crashkernel cmdline parameter is parsed _after_ memory setup
+ * we also parse it here (workaround for EHB5200) */
+static uint64_t crashk_size, crashk_base;
+#endif
+
static int octeon_uart;
extern asmlinkage void handle_int(void);
@@ -467,6 +662,8 @@ void __init prom_init(void)
int i;
int argc;
struct uart_port octeon_port;
+ char *p;
+ const char *arg;
#ifdef CONFIG_CAVIUM_RESERVE32
int64_t addr = -1;
#endif
@@ -629,6 +826,15 @@ void __init prom_init(void)
if (octeon_is_simulation())
MAX_MEMORY = 64ull << 20;
+ arg = strstr(arcs_cmdline, "mem=");
+ if (arg) {
+ MAX_MEMORY = memparse(arg + 4, &p);
+ if (MAX_MEMORY == 0)
+ MAX_MEMORY = 32ull << 30;
+ if (*p == '@')
+ RESERVE_LOW_MEM = memparse(p + 1, &p);
+ }
+
arcs_cmdline[0] = 0;
argc = octeon_boot_desc_ptr->argc;
for (i = 0; i < argc; i++) {
@@ -636,16 +842,25 @@ void __init prom_init(void)
cvmx_phys_to_ptr(octeon_boot_desc_ptr->argv[i]);
if ((strncmp(arg, "MEM=", 4) == 0) ||
(strncmp(arg, "mem=", 4) == 0)) {
- sscanf(arg + 4, "%llu", &MAX_MEMORY);
- MAX_MEMORY <<= 20;
+ MAX_MEMORY = memparse(arg + 4, &p);
if (MAX_MEMORY == 0)
MAX_MEMORY = 32ull << 30;
+ if (*p == '@')
+ RESERVE_LOW_MEM = memparse(p + 1, &p);
} else if (strcmp(arg, "ecc_verbose") == 0) {
#ifdef CONFIG_CAVIUM_REPORT_SINGLE_BIT_ECC
__cvmx_interrupt_ecc_report_single_bit_errors = 1;
pr_notice("Reporting of single bit ECC errors is "
"turned on\n");
#endif
+#ifdef CONFIG_KEXEC
+ } else if (strncmp(arg, "crashkernel=", 12) == 0) {
+ crashk_size = memparse(arg+12, &p);
+ if (*p == '@')
+ crashk_base = memparse(p+1, &p);
+ strcat(arcs_cmdline, " ");
+ strcat(arcs_cmdline, arg);
+#endif
} else if (strlen(arcs_cmdline) + strlen(arg) + 1 <
sizeof(arcs_cmdline) - 1) {
strcat(arcs_cmdline, " ");
@@ -685,6 +900,12 @@ void __init prom_init(void)
_machine_restart = octeon_restart;
_machine_halt = octeon_halt;
+#ifdef CONFIG_KEXEC
+ _machine_kexec_shutdown = octeon_shutdown;
+ _machine_crash_shutdown = octeon_crash_shutdown;
+ _machine_kexec_prepare = octeon_kexec_prepare;
+#endif
+
memset(&octeon_port, 0, sizeof(octeon_port));
/*
* For early_serial_setup we don't set the port type or
@@ -717,17 +938,15 @@ void __init plat_mem_setup(void)
{
uint64_t mem_alloc_size;
uint64_t total;
+ uint64_t crashk_end;
+#ifndef CONFIG_CRASH_DUMP
int64_t memory;
+ uint64_t kernel_start;
+ uint64_t kernel_size;
+#endif
total = 0;
-
- /* First add the init memory we will be returning. */
- memory = __pa_symbol(&__init_begin) & PAGE_MASK;
- mem_alloc_size = (__pa_symbol(&__init_end) & PAGE_MASK) - memory;
- if (mem_alloc_size > 0) {
- add_memory_region(memory, mem_alloc_size, BOOT_MEM_RAM);
- total += mem_alloc_size;
- }
+ crashk_end = 0;
/*
* The Mips memory init uses the first memory location for
@@ -740,6 +959,17 @@ void __init plat_mem_setup(void)
if (mem_alloc_size > MAX_MEMORY)
mem_alloc_size = MAX_MEMORY;
+/* Crashkernel ignores bootmem list. It relies on mem=X@Y option */
+#ifdef CONFIG_CRASH_DUMP
+ add_memory_region(RESERVE_LOW_MEM, MAX_MEMORY, BOOT_MEM_RAM);
+ total += MAX_MEMORY;
+#else
+#ifdef CONFIG_KEXEC
+ if (crashk_size > 0) {
+ add_memory_region(crashk_base, crashk_size, BOOT_MEM_RAM);
+ crashk_end = crashk_base + crashk_size;
+ }
+#endif
/*
* When allocating memory, we want incrementing addresses from
* bootmem_alloc so the code in add_memory_region can merge
@@ -750,9 +980,10 @@ void __init plat_mem_setup(void)
&& (total < MAX_MEMORY)) {
#if defined(CONFIG_64BIT) || defined(CONFIG_64BIT_PHYS_ADDR)
memory = cvmx_bootmem_phy_alloc(mem_alloc_size,
- __pa_symbol(&__init_end), -1,
- 0x100000,
+ RESERVE_LOW_MEM,
+ /*-1*/0, 0x100000,
CVMX_BOOTMEM_FLAG_NO_LOCKING);
+
#elif defined(CONFIG_HIGHMEM)
memory = cvmx_bootmem_phy_alloc(mem_alloc_size, 0, 1ull << 31,
0x100000,
@@ -763,19 +994,61 @@ void __init plat_mem_setup(void)
CVMX_BOOTMEM_FLAG_NO_LOCKING);
#endif
if (memory >= 0) {
- /*
- * This function automatically merges address
- * regions next to each other if they are
- * received in incrementing order.
- */
- add_memory_region(memory, mem_alloc_size, BOOT_MEM_RAM);
+#ifdef CONFIG_KEXEC
+ uint64_t end = memory + mem_alloc_size;
+ /* This function automatically merges address
+ regions next to each other if they are
+ received in incrementing order */
+ if (memory < crashk_base && end > crashk_end) {
+ /* region is fully in */
+ add_memory_region(memory,
+ crashk_base - memory,
+ BOOT_MEM_RAM);
+ total += crashk_base - memory;
+ add_memory_region(crashk_end,
+ end - crashk_end,
+ BOOT_MEM_RAM);
+ total += end - crashk_end;
+ continue;
+ }
+
+ if (memory >= crashk_base && end <= crashk_end)
+ /* Entire memory region is within the
+ * new kernel's memory, ignore it. */
+ continue;
+
+ if (memory > crashk_base && memory < crashk_end &&
+ end > crashk_end) {
+ /* Overlap with the beginning of the
+ * region, reserve the beginning. */
+ mem_alloc_size -= crashk_end - memory;
+ memory = crashk_end;
+ } else if (memory < crashk_base && end > crashk_base &&
+ end < crashk_end)
+ /* Overlap with the beginning of the
+ * region, chop of end. */
+ mem_alloc_size -= end - crashk_base;
+#endif
+ add_memory_region(memory, mem_alloc_size,
+ BOOT_MEM_RAM);
total += mem_alloc_size;
+
+ /* Recovering mem_alloc_size */
+ mem_alloc_size = 4 << 20;
} else {
break;
}
}
cvmx_bootmem_unlock();
+ /* Add the memory region for the kernel. */
+ kernel_start = (unsigned long) _text;
+ kernel_size = ALIGN(_end - _text, 0x100000);
+
+ /* Adjust for physical offset. */
+ kernel_start &= ~0xffffffff80000000ULL;
+ add_memory_region(kernel_start, kernel_size, BOOT_MEM_RAM);
+#endif /* CONFIG_CRASH_DUMP */
#ifdef CONFIG_CAVIUM_RESERVE32
/*
* Now that we've allocated the kernel memory it is safe to
diff --git a/arch/mips/cavium-octeon/smp.c b/arch/mips/cavium-octeon/smp.c
index 51e9802..06fe291 100644
--- a/arch/mips/cavium-octeon/smp.c
+++ b/arch/mips/cavium-octeon/smp.c
@@ -65,6 +65,11 @@ void octeon_send_ipi_single(int cpu, unsigned int action)
cvmx_write_csr(CVMX_CIU_MBOX_SETX(coreid), action);
}
+void core_send_ipi(int cpu, unsigned int action)
+{
+ octeon_send_ipi_single(cpu, action);
+}
+
static inline void octeon_send_ipi_mask(const struct cpumask *mask,
unsigned int action)
{
diff --git a/arch/mips/include/asm/octeon/cvmx-bootmem.h b/arch/mips/include/asm/octeon/cvmx-bootmem.h
index 8e708bd..2f3cb9f 100644
--- a/arch/mips/include/asm/octeon/cvmx-bootmem.h
+++ b/arch/mips/include/asm/octeon/cvmx-bootmem.h
@@ -370,4 +370,6 @@ void cvmx_bootmem_lock(void);
*/
void cvmx_bootmem_unlock(void);
+void *cvmx_bootmem_get_desc(void);
+
#endif /* __CVMX_BOOTMEM_H__ */
diff --git a/arch/mips/kernel/relocate_kernel.S b/arch/mips/kernel/relocate_kernel.S
index 0abaf7a..961c10b 100644
--- a/arch/mips/kernel/relocate_kernel.S
+++ b/arch/mips/kernel/relocate_kernel.S
@@ -78,7 +78,19 @@ done:
LONG_S zero,(t0)
#endif
+#ifdef CONFIG_CPU_CAVIUM_OCTEON
+ /* We need to flush I-cache before jumping to new kernel.
+ * Unfortunatelly, this code is cpu-specific.
+ */
+ .set push
+ .set noreorder
+ syncw
+ syncw
+ synci 0($0)
+ .set pop
+#else
sync
+#endif
/* jump to kexec_start_address */
j s1
END(relocate_new_kernel)
@@ -110,7 +122,14 @@ LEAF(kexec_smp_wait)
1: LONG_L s0, (t0)
bne s0, zero,1b
+#ifdef CONFIG_CPU_CAVIUM_OCTEON
+ .set push
+ .set noreorder
+ synci 0($0)
+ .set pop
+#else
sync
+#endif
j s1
END(kexec_smp_wait)
#endif
Signed-off-by: Maxim Uvarov <muvarov@gmail.com>
_______________________________________________
kexec mailing list
kexec@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/kexec
^ permalink raw reply related [flat|nested] 11+ messages in thread
* Re: [PATCH 1/2] MIPS kexec,kdump support
2010-03-03 11:05 ` Maxim Uvarov
@ 2010-03-03 16:34 ` wilbur.chan
-1 siblings, 0 replies; 11+ messages in thread
From: wilbur.chan @ 2010-03-03 16:34 UTC (permalink / raw)
To: Maxim Uvarov; +Cc: linux-mips, kexec, horms, ralf
2010/3/3 Maxim Uvarov <muvarov@gmail.com>:
> Hello folks,
>
> Please find here MIPS crash and kdump patches.
> This is patch set of 3 patches:
> 1. generic MIPS changes (kernel);
> 2. MIPS Cavium Octeon board kexec/kdump code (kernel);
> 3. Kexec user space MIPS changes.
>
> Patches were tested on the latest linux-mips@ git kernel and the latest
> kexec-tools git on Cavium Octeon 50xx board.
>
> I also made the same code working on RMI XLR/XLS boards for both
> mips32 and mips64 kernels.
>
> Best regards,
> Maxim Uvarov.
>
> Signed-off-by: Maxim Uvarov <muvarov@gmail.com>
>
>
>
Hi, Maxim
In XLR series ,
1)How to protect boardinfo and pass it to second kernel ?
2)If all cpus jumped to same entry point , did you change head.s ,if so , how ?
Thank you!
^ permalink raw reply [flat|nested] 11+ messages in thread
* Re: [PATCH 1/2] MIPS kexec,kdump support
@ 2010-03-03 16:34 ` wilbur.chan
0 siblings, 0 replies; 11+ messages in thread
From: wilbur.chan @ 2010-03-03 16:34 UTC (permalink / raw)
To: Maxim Uvarov; +Cc: linux-mips, horms, kexec, ralf
2010/3/3 Maxim Uvarov <muvarov@gmail.com>:
> Hello folks,
>
> Please find here MIPS crash and kdump patches.
> This is patch set of 3 patches:
> 1. generic MIPS changes (kernel);
> 2. MIPS Cavium Octeon board kexec/kdump code (kernel);
> 3. Kexec user space MIPS changes.
>
> Patches were tested on the latest linux-mips@ git kernel and the latest
> kexec-tools git on Cavium Octeon 50xx board.
>
> I also made the same code working on RMI XLR/XLS boards for both
> mips32 and mips64 kernels.
>
> Best regards,
> Maxim Uvarov.
>
> Signed-off-by: Maxim Uvarov <muvarov@gmail.com>
>
>
>
Hi, Maxim
In XLR series ,
1)How to protect boardinfo and pass it to second kernel ?
2)If all cpus jumped to same entry point , did you change head.s ,if so , how ?
Thank you!
_______________________________________________
kexec mailing list
kexec@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/kexec
^ permalink raw reply [flat|nested] 11+ messages in thread
* Re: [PATCH 1/2] MIPS kexec,kdump support
2010-03-03 11:05 ` Maxim Uvarov
` (2 preceding siblings ...)
(?)
@ 2010-03-03 17:36 ` David Daney
2010-03-04 11:35 ` Maxim Uvarov
-1 siblings, 1 reply; 11+ messages in thread
From: David Daney @ 2010-03-03 17:36 UTC (permalink / raw)
To: Maxim Uvarov; +Cc: linux-mips, kexec, horms, ralf
On 03/03/2010 03:05 AM, Maxim Uvarov wrote:
> Hello folks,
>
> Please find here MIPS crash and kdump patches.
> This is patch set of 3 patches:
> 1. generic MIPS changes (kernel);
> 2. MIPS Cavium Octeon board kexec/kdump code (kernel);
> 3. Kexec user space MIPS changes.
>
> Patches were tested on the latest linux-mips@ git kernel and the latest
> kexec-tools git on Cavium Octeon 50xx board.
>
> I also made the same code working on RMI XLR/XLS boards for both
> mips32 and mips64 kernels.
>
> Best regards,
> Maxim Uvarov.
>
>
> ---
>
> arch/mips/Kconfig | 24 ++++++++++
[...]
>
>
> Signed-off-by: Maxim Uvarov<muvarov@gmail.com>
>
That Signed-off-by: needs to be just above the '---' not at the end.
David Daney
^ permalink raw reply [flat|nested] 11+ messages in thread
* Re: [PATCH 1/2] MIPS kexec,kdump support
2010-03-03 17:36 ` David Daney
@ 2010-03-04 11:35 ` Maxim Uvarov
0 siblings, 0 replies; 11+ messages in thread
From: Maxim Uvarov @ 2010-03-04 11:35 UTC (permalink / raw)
To: David Daney; +Cc: linux-mips, kexec, horms, ralf
2010/3/3 David Daney <ddaney@caviumnetworks.com>:
> On 03/03/2010 03:05 AM, Maxim Uvarov wrote:
>>
>> Hello folks,
>>
>> Please find here MIPS crash and kdump patches.
>> This is patch set of 3 patches:
>> 1. generic MIPS changes (kernel);
>> 2. MIPS Cavium Octeon board kexec/kdump code (kernel);
>> 3. Kexec user space MIPS changes.
>>
>> Patches were tested on the latest linux-mips@ git kernel and the latest
>> kexec-tools git on Cavium Octeon 50xx board.
>>
>> I also made the same code working on RMI XLR/XLS boards for both
>> mips32 and mips64 kernels.
>>
>> Best regards,
>> Maxim Uvarov.
>>
>>
>> ---
>>
>> arch/mips/Kconfig | 24 ++++++++++
>
> [...]
>>
>>
>> Signed-off-by: Maxim Uvarov<muvarov@gmail.com>
>>
>
> That Signed-off-by: needs to be just above the '---' not at the end.
>
> David Daney
>
Thanks David, I corrected stgit email template. I think I don't need
resend patches with only this change.
--
Best regards,
Maxim Uvarov
^ permalink raw reply [flat|nested] 11+ messages in thread
* Re: [PATCH 1/2] MIPS kexec,kdump support
@ 2010-03-04 11:35 ` Maxim Uvarov
0 siblings, 0 replies; 11+ messages in thread
From: Maxim Uvarov @ 2010-03-04 11:35 UTC (permalink / raw)
To: David Daney; +Cc: linux-mips, horms, kexec, ralf
2010/3/3 David Daney <ddaney@caviumnetworks.com>:
> On 03/03/2010 03:05 AM, Maxim Uvarov wrote:
>>
>> Hello folks,
>>
>> Please find here MIPS crash and kdump patches.
>> This is patch set of 3 patches:
>> 1. generic MIPS changes (kernel);
>> 2. MIPS Cavium Octeon board kexec/kdump code (kernel);
>> 3. Kexec user space MIPS changes.
>>
>> Patches were tested on the latest linux-mips@ git kernel and the latest
>> kexec-tools git on Cavium Octeon 50xx board.
>>
>> I also made the same code working on RMI XLR/XLS boards for both
>> mips32 and mips64 kernels.
>>
>> Best regards,
>> Maxim Uvarov.
>>
>>
>> ---
>>
>> arch/mips/Kconfig | 24 ++++++++++
>
> [...]
>>
>>
>> Signed-off-by: Maxim Uvarov<muvarov@gmail.com>
>>
>
> That Signed-off-by: needs to be just above the '---' not at the end.
>
> David Daney
>
Thanks David, I corrected stgit email template. I think I don't need
resend patches with only this change.
--
Best regards,
Maxim Uvarov
_______________________________________________
kexec mailing list
kexec@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/kexec
^ permalink raw reply [flat|nested] 11+ messages in thread
* Re: [PATCH 1/2] MIPS kexec,kdump support
2010-03-03 16:34 ` wilbur.chan
@ 2010-03-04 11:58 ` Maxim Uvarov
-1 siblings, 0 replies; 11+ messages in thread
From: Maxim Uvarov @ 2010-03-04 11:58 UTC (permalink / raw)
To: wilbur.chan; +Cc: linux-mips, kexec, horms, ralf
2010/3/3 wilbur.chan <wilbur512@gmail.com>:
> 2010/3/3 Maxim Uvarov <muvarov@gmail.com>:
>> Hello folks,
>>
>> Please find here MIPS crash and kdump patches.
>> This is patch set of 3 patches:
>> 1. generic MIPS changes (kernel);
>> 2. MIPS Cavium Octeon board kexec/kdump code (kernel);
>> 3. Kexec user space MIPS changes.
>>
>> Patches were tested on the latest linux-mips@ git kernel and the latest
>> kexec-tools git on Cavium Octeon 50xx board.
>>
>> I also made the same code working on RMI XLR/XLS boards for both
>> mips32 and mips64 kernels.
>>
>> Best regards,
>> Maxim Uvarov.
>>
>
>> Signed-off-by: Maxim Uvarov <muvarov@gmail.com>
>>
>>
>>
>
> Hi, Maxim
>
> In XLR series ,
>
> 1)How to protect boardinfo and pass it to second kernel ?
>
It is very simple. I just looked at physical addresses where
boardinfo is and protect this
region. For xls simple add additional exclude region to setup.c
static struct boot_mem_map_exclude_region static_exclude_regions[] = {
+ [1] = {0xc000000, 0xd000000 }, /*Bootloader stuctures*/
To pass it to second kernel copy pointer to original psb_info to
static variable in beginning of prom_init() and provide this pointer
as kexec_args[3].
kexec_args[0] is argc on XLS
kexec_args[1] is argv on XLS
> 2)If all cpus jumped to same entry point , did you change head.s, if so , how ?
>
Please take a look how other platforms do this. You need write .macro
kernel_entry_setup which should be located in somewhere is
include/asm-mips/mach-rmi. Then you write this macro it will be
executed before kernel_entry. So after kexec all cpus jump to this
entry point and after they you can do all things what you want:
- make cpu0 boot new kernel and other cpus go to boot slaves procedure;
- take first cpu and make it boot, and all others go to boot slaves procedure;
- boot only cpu0 and infinite loop others cpus (you might want to do
this for kdump)
>
>
> Thank you!
>
--
Best regards,
Maxim Uvarov
^ permalink raw reply [flat|nested] 11+ messages in thread
* Re: [PATCH 1/2] MIPS kexec,kdump support
@ 2010-03-04 11:58 ` Maxim Uvarov
0 siblings, 0 replies; 11+ messages in thread
From: Maxim Uvarov @ 2010-03-04 11:58 UTC (permalink / raw)
To: wilbur.chan; +Cc: linux-mips, horms, kexec, ralf
2010/3/3 wilbur.chan <wilbur512@gmail.com>:
> 2010/3/3 Maxim Uvarov <muvarov@gmail.com>:
>> Hello folks,
>>
>> Please find here MIPS crash and kdump patches.
>> This is patch set of 3 patches:
>> 1. generic MIPS changes (kernel);
>> 2. MIPS Cavium Octeon board kexec/kdump code (kernel);
>> 3. Kexec user space MIPS changes.
>>
>> Patches were tested on the latest linux-mips@ git kernel and the latest
>> kexec-tools git on Cavium Octeon 50xx board.
>>
>> I also made the same code working on RMI XLR/XLS boards for both
>> mips32 and mips64 kernels.
>>
>> Best regards,
>> Maxim Uvarov.
>>
>
>> Signed-off-by: Maxim Uvarov <muvarov@gmail.com>
>>
>>
>>
>
> Hi, Maxim
>
> In XLR series ,
>
> 1)How to protect boardinfo and pass it to second kernel ?
>
It is very simple. I just looked at physical addresses where
boardinfo is and protect this
region. For xls simple add additional exclude region to setup.c
static struct boot_mem_map_exclude_region static_exclude_regions[] = {
+ [1] = {0xc000000, 0xd000000 }, /*Bootloader stuctures*/
To pass it to second kernel copy pointer to original psb_info to
static variable in beginning of prom_init() and provide this pointer
as kexec_args[3].
kexec_args[0] is argc on XLS
kexec_args[1] is argv on XLS
> 2)If all cpus jumped to same entry point , did you change head.s, if so , how ?
>
Please take a look how other platforms do this. You need write .macro
kernel_entry_setup which should be located in somewhere is
include/asm-mips/mach-rmi. Then you write this macro it will be
executed before kernel_entry. So after kexec all cpus jump to this
entry point and after they you can do all things what you want:
- make cpu0 boot new kernel and other cpus go to boot slaves procedure;
- take first cpu and make it boot, and all others go to boot slaves procedure;
- boot only cpu0 and infinite loop others cpus (you might want to do
this for kdump)
>
>
> Thank you!
>
--
Best regards,
Maxim Uvarov
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-- links below jump to the message on this page --
2010-03-03 11:05 [PATCH 1/2] MIPS kexec,kdump support Maxim Uvarov
2010-03-03 11:05 ` Maxim Uvarov
2010-03-03 11:05 ` [PATCH 2/2] MIPS Cavium Octeon board " Maxim Uvarov
2010-03-03 11:05 ` Maxim Uvarov
2010-03-03 16:34 ` [PATCH 1/2] MIPS " wilbur.chan
2010-03-03 16:34 ` wilbur.chan
2010-03-04 11:58 ` Maxim Uvarov
2010-03-04 11:58 ` Maxim Uvarov
2010-03-03 17:36 ` David Daney
2010-03-04 11:35 ` Maxim Uvarov
2010-03-04 11:35 ` Maxim Uvarov
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