Add kexec/kdump support for Loongson64 by:
1, Provide Loongson-specific kexec functions: loongson_kexec_prepare,
loongson_kexec_shutdown and loongson_crash_shutdown;
2, Provide Loongson-specific code in kexec_smp_wait;
3, Clear mailbox in loongson3_smp_setup() since KEXEC bypass BIOS;
4, KEXEC always run at boot-cpu, but KDUMP may triggered at non-boot-
cpu. Loongson64 assume boot-cpu is the first possible cpu, so fix
boot_cpu_id in prom_init_env();
Cc: Eric Biederman <ebiederm@xxxxxxxxxxxx>
Signed-off-by: Huacai Chen <chenhc@xxxxxxxxxx>
---
arch/mips/kernel/relocate_kernel.S | 26 ++++++++++
arch/mips/loongson64/common/env.c | 7 +++
arch/mips/loongson64/common/reset.c | 95 +++++++++++++++++++++++++++++++++++
arch/mips/loongson64/loongson-3/smp.c | 5 ++
4 files changed, 133 insertions(+)
diff --git a/arch/mips/kernel/relocate_kernel.S b/arch/mips/kernel/relocate_kernel.S
index 419c921..da281c5 100644
--- a/arch/mips/kernel/relocate_kernel.S
+++ b/arch/mips/kernel/relocate_kernel.S
@@ -135,6 +135,32 @@ LEAF(kexec_smp_wait)
#else
sync
#endif
+
+#ifdef CONFIG_CPU_LOONGSON3
+ /* s0:prid s1:initfn */
+ /* t0:base t1:cpuid t2:node t9:count */
+ mfc0 t1, CP0_EBASE
+ andi t1, MIPS_EBASE_CPUNUM
+ dli t0, 0x900000003ff01000 /* mailbox base */
+ dins t0, t1, 8, 2 /* insert core id*/
+ dext t2, t1, 2, 2
+ dins t0, t2, 44, 2 /* insert node id */
+ mfc0 s0, CP0_PRID
+ andi s0, s0, 0xf
+ blt s0, 0x6, 1f /* Loongson-3A1000 */
+ bgt s0, 0x7, 1f /* Loongson-3A2000/3A3000 */
+ dins t0, t2, 14, 2 /* Loongson-3B1000/3B1500 need bit 15~14 */
+1: li t9, 0x100 /* wait for init loop */
+2: addiu t9, -1 /* limit mailbox access */
+ bnez t9, 2b
+ ld s1, 0x20(t0) /* get PC via mailbox */
+ beqz s1, 1b
+ ld sp, 0x28(t0) /* get SP via mailbox */
+ ld gp, 0x30(t0) /* get GP via mailbox */
+ ld a1, 0x38(t0)
+ jr s1 /* jump to initial PC */
+#endif
+
j s1
END(kexec_smp_wait)
#endif
diff --git a/arch/mips/loongson64/common/env.c b/arch/mips/loongson64/common/env.c
index d4f9979..d325ae6 100644
--- a/arch/mips/loongson64/common/env.c
+++ b/arch/mips/loongson64/common/env.c
@@ -149,6 +149,13 @@ void __init prom_init_env(void)
loongson_sysconf.nr_cpus = ecpu->nr_cpus;
loongson_sysconf.boot_cpu_id = ecpu->cpu_startup_core_id;
loongson_sysconf.reserved_cpus_mask = ecpu->reserved_cores_mask;
+#ifdef CONFIG_KEXEC
+ loongson_sysconf.boot_cpu_id = get_ebase_cpunum();
+ loongson_sysconf.reserved_cpus_mask |=
+ (1 << loongson_sysconf.boot_cpu_id) - 1;
+ pr_info("Boot CPU ID is being fixed from %d to %d\n",
+ ecpu->cpu_startup_core_id, loongson_sysconf.boot_cpu_id);
+#endif
if (ecpu->nr_cpus > NR_CPUS || ecpu->nr_cpus == 0)
loongson_sysconf.nr_cpus = NR_CPUS;
loongson_sysconf.nr_nodes = (loongson_sysconf.nr_cpus +
diff --git a/arch/mips/loongson64/common/reset.c b/arch/mips/loongson64/common/reset.c
index a60715e..58c3926 100644
--- a/arch/mips/loongson64/common/reset.c
+++ b/arch/mips/loongson64/common/reset.c
@@ -9,9 +9,14 @@
* Copyright (C) 2009 Lemote, Inc.
* Author: Zhangjin Wu, wuzhangjin@xxxxxxxxx
*/
+#include <linux/cpu.h>
+#include <linux/delay.h>
#include <linux/init.h>
+#include <linux/kexec.h>
#include <linux/pm.h>
+#include <linux/slab.h>
+#include <asm/bootinfo.h>
#include <asm/idle.h>
#include <asm/reboot.h>
@@ -80,12 +85,102 @@ static void loongson_halt(void)
}
}
+#ifdef CONFIG_KEXEC
+
+/* 0X80000000~0X80200000 is safe */
+#define MAX_ARGS 64
+#define KEXEC_CTRL_CODE 0xFFFFFFFF80100000UL
+#define KEXEC_ARGV_ADDR 0xFFFFFFFF80108000UL
+#define KEXEC_ARGV_SIZE 3060
+#define KEXEC_ENVP_SIZE 4500
+
+void *kexec_argv;
+void *kexec_envp;
+
+static int loongson_kexec_prepare(struct kimage *image)
+{
+ int i, argc = 0;
+ unsigned int *argv;
+ char *str, *ptr, *bootloader = "kexec";
+
+ /* argv at offset 0, argv[] at offset KEXEC_ARGV_SIZE/2 */
+ argv = (unsigned int *)kexec_argv;
+ argv[argc++] = (unsigned int)(KEXEC_ARGV_ADDR + KEXEC_ARGV_SIZE/2);
+
+ 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 offt;
+ memcpy(kexec_argv + KEXEC_ARGV_SIZE/2,
+ image->segment[i].buf, KEXEC_ARGV_SIZE/2);
+ str = (char *)kexec_argv + KEXEC_ARGV_SIZE/2;
+ ptr = strchr(str, ' ');
+
+ while (ptr && (argc < MAX_ARGS)) {
+ *ptr = '\0';
+ if (ptr[1] != ' ') {
+ offt = (int)(ptr - str + 1);
+ argv[argc] = KEXEC_ARGV_ADDR +
+ KEXEC_ARGV_SIZE/2 + offt;
+ argc++;
+ }
+ ptr = strchr(ptr + 1, ' ');
+ }
+ break;
+ }
+ }
+
+ kexec_args[0] = argc;
+ kexec_args[1] = fw_arg1;
+ kexec_args[2] = fw_arg2;
+ image->control_code_page = virt_to_page((void *)KEXEC_CTRL_CODE);
+
+ return 0;
+}
+
+static void loongson_kexec_shutdown(void)
+{
+#ifdef CONFIG_SMP
+ int cpu;
+
+ for_each_possible_cpu(cpu)
+ if (!cpu_online(cpu))
+ cpu_up(cpu); /* All cpus go to reboot_code_buffer */
+#endif
+ memcpy((void *)fw_arg1, kexec_argv, KEXEC_ARGV_SIZE);
+ memcpy((void *)fw_arg2, kexec_envp, KEXEC_ENVP_SIZE);
+}
+
+static void loongson_crash_shutdown(struct pt_regs *regs)
+{
+ default_machine_crash_shutdown(regs);
+ memcpy((void *)fw_arg1, kexec_argv, KEXEC_ARGV_SIZE);
+ memcpy((void *)fw_arg2, kexec_envp, KEXEC_ENVP_SIZE);
+}
+
+#endif
+
static int __init mips_reboot_setup(void)
{
_machine_restart = loongson_restart;
_machine_halt = loongson_halt;
pm_power_off = loongson_poweroff;
+#ifdef CONFIG_KEXEC
+ kexec_argv = kmalloc(KEXEC_ARGV_SIZE, GFP_KERNEL);
+ kexec_envp = kmalloc(KEXEC_ENVP_SIZE, GFP_KERNEL);
+ fw_arg1 = KEXEC_ARGV_ADDR;
+ memcpy(kexec_envp, (void *)fw_arg2, KEXEC_ENVP_SIZE);
+
+ _machine_kexec_prepare = loongson_kexec_prepare;
+ _machine_kexec_shutdown = loongson_kexec_shutdown;
+ _machine_crash_shutdown = loongson_crash_shutdown;
+#endif
+
return 0;
}
diff --git a/arch/mips/loongson64/loongson-3/smp.c b/arch/mips/loongson64/loongson-3/smp.c
index bfaba5b..49ef958 100644
--- a/arch/mips/loongson64/loongson-3/smp.c
+++ b/arch/mips/loongson64/loongson-3/smp.c
@@ -388,6 +388,11 @@ static void __init loongson3_smp_setup(void)
ipi_status0_regs_init();
ipi_en0_regs_init();
ipi_mailbox_buf_init();
+
+ /* BIOS clear the mailbox, but KEXEC bypass BIOS so clear here */
+ for (i = 0; i < loongson_sysconf.nr_cpus; i++)
+ loongson3_ipi_write64(0, (void *)(ipi_mailbox_buf[i]+0x0));
+
cpu_set_core(&cpu_data[0],
cpu_logical_map(0) % loongson_sysconf.cores_per_package);
cpu_data[0].package = cpu_logical_map(0) / loongson_sysconf.cores_per_package;
--
2.7.0
