aboutsummaryrefslogtreecommitdiff
path: root/arch/mips
diff options
context:
space:
mode:
authorRalf Baechle <ralf@linux-mips.org>2012-10-25 16:23:31 +0200
committerRalf Baechle <ralf@linux-mips.org>2012-12-13 17:00:39 +0100
commitabe77f90dc9c65a7c9a4d61c2cbb8db4d5566e4f (patch)
tree69fd0cfe31a9041e8e1a881829c011892075ea2c /arch/mips
parent7aa1c8f47e7e792d11f898cbdddaf6fa21ff08cc (diff)
downloadlinux-linaro-stable-abe77f90dc9c65a7c9a4d61c2cbb8db4d5566e4f.tar.gz
MIPS: Octeon: Add kexec and kdump 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/1026/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Diffstat (limited to 'arch/mips')
-rw-r--r--arch/mips/Makefile4
-rw-r--r--arch/mips/cavium-octeon/executive/cvmx-bootmem.c5
-rw-r--r--arch/mips/cavium-octeon/setup.c312
-rw-r--r--arch/mips/include/asm/octeon/cvmx-bootmem.h2
-rw-r--r--arch/mips/kernel/crash_dump.c2
-rw-r--r--arch/mips/kernel/relocate_kernel.S19
6 files changed, 335 insertions, 9 deletions
diff --git a/arch/mips/Makefile b/arch/mips/Makefile
index 654b1ad39f05..033395ec82f1 100644
--- a/arch/mips/Makefile
+++ b/arch/mips/Makefile
@@ -192,6 +192,10 @@ endif
#
include $(srctree)/arch/mips/Kbuild.platforms
+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/cavium-octeon/executive/cvmx-bootmem.c b/arch/mips/cavium-octeon/executive/cvmx-bootmem.c
index fdf5f19bfdb0..6d5ddbc112cc 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;
}
+
+struct cvmx_bootmem_desc *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 67aa3b942f06..7c2b7aab77ba 100644
--- a/arch/mips/cavium-octeon/setup.c
+++ b/arch/mips/cavium-octeon/setup.c
@@ -25,6 +25,7 @@
#include <linux/serial_8250.h>
#include <linux/of_fdt.h>
#include <linux/libfdt.h>
+#include <linux/kexec.h>
#include <asm/processor.h>
#include <asm/reboot.h>
@@ -58,11 +59,208 @@ 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.
+ */
+static void octeon_kexec_smp_down(void *ignored)
+{
+ int cpu = smp_processor_id();
+
+ local_irq_disable();
+ set_cpu_online(cpu, false);
+ while (!atomic_read(&kexec_ready_to_reboot))
+ cpu_relax();
+
+ asm volatile (
+ " sync \n"
+ " synci ($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 = cvmx_bootmem_get_desc();
+
+ if (mem_size > OCTEON_MAX_PHY_MEM_SIZE) {
+ mem_size = OCTEON_MAX_PHY_MEM_SIZE;
+ pr_err("Error: requested memory 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);
+}
+
+static 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 = 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
+}
+
+static 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
+}
+
+static void octeon_crash_shutdown(struct pt_regs *regs)
+{
+ octeon_generic_shutdown();
+ default_machine_crash_shutdown(regs);
+}
+
+#endif /* CONFIG_KEXEC */
+
#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);
@@ -417,6 +615,8 @@ void octeon_user_io_init(void)
void __init prom_init(void)
{
struct cvmx_sysinfo *sysinfo;
+ const char *arg;
+ char *p;
int i;
int argc;
#ifdef CONFIG_CAVIUM_RESERVE32
@@ -568,6 +768,15 @@ 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++) {
@@ -575,16 +784,30 @@ 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);
+ /*
+ * To do: switch parsing to new style, something like:
+ * parse_crashkernel(arg, sysinfo->system_dram_size,
+ * &crashk_size, &crashk_base);
+ */
+#endif
} else if (strlen(arcs_cmdline) + strlen(arg) + 1 <
sizeof(arcs_cmdline) - 1) {
strcat(arcs_cmdline, " ");
@@ -619,11 +842,18 @@ 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
+
octeon_user_io_init();
register_smp_ops(&octeon_smp_ops);
}
/* Exclude a single page from the regions obtained in plat_mem_setup. */
+#ifndef CONFIG_CRASH_DUMP
static __init void memory_exclude_page(u64 addr, u64 *mem, u64 *size)
{
if (addr > *mem && addr < *mem + *size) {
@@ -638,14 +868,21 @@ static __init void memory_exclude_page(u64 addr, u64 *mem, u64 *size)
*size -= PAGE_SIZE;
}
}
+#endif /* CONFIG_CRASH_DUMP */
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;
+ crashk_end = 0;
/*
* The Mips memory init uses the first memory location for
@@ -658,6 +895,17 @@ 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
@@ -672,6 +920,9 @@ void __init plat_mem_setup(void)
CVMX_BOOTMEM_FLAG_NO_LOCKING);
if (memory >= 0) {
u64 size = mem_alloc_size;
+#ifdef CONFIG_KEXEC
+ uint64_t end;
+#endif
/*
* exclude a page at the beginning and end of
@@ -684,20 +935,67 @@ void __init plat_mem_setup(void)
memory_exclude_page(CVMX_PCIE_BAR1_PHYS_BASE +
CVMX_PCIE_BAR1_PHYS_SIZE,
&memory, &size);
+#ifdef CONFIG_KEXEC
+ end = memory + mem_alloc_size;
/*
- * This function automatically merges address
- * regions next to each other if they are
- * received in incrementing order.
+ * This function automatically merges address regions
+ * next to each other if they are received in
+ * incrementing order
*/
- if (size)
- add_memory_region(memory, size, BOOT_MEM_RAM);
+ 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
/*
diff --git a/arch/mips/include/asm/octeon/cvmx-bootmem.h b/arch/mips/include/asm/octeon/cvmx-bootmem.h
index 877845b84b14..42db2be663f1 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);
+extern struct cvmx_bootmem_desc *cvmx_bootmem_get_desc(void);
+
#endif /* __CVMX_BOOTMEM_H__ */
diff --git a/arch/mips/kernel/crash_dump.c b/arch/mips/kernel/crash_dump.c
index d9ec3898f9fa..35bed0d2342c 100644
--- a/arch/mips/kernel/crash_dump.c
+++ b/arch/mips/kernel/crash_dump.c
@@ -3,8 +3,6 @@
#include <linux/crash_dump.h>
#include <asm/uaccess.h>
-unsigned long long elfcorehdr_addr = ELFCORE_ADDR_MAX;
-
static int __init parse_savemaxmem(char *p)
{
if (p)
diff --git a/arch/mips/kernel/relocate_kernel.S b/arch/mips/kernel/relocate_kernel.S
index 0b108587f065..e4142c5f7c2b 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