Commit 773cb77d authored by Ralf Baechle's avatar Ralf Baechle

MIPS: Cavium: Add CPU hotplugging code.

Thanks to Cavium Inc. for the code contribution and help.
Signed-off-by: default avatarRalf Baechle <ralf@linux-mips.org>
parent 9801b321
......@@ -601,6 +601,7 @@ config CAVIUM_OCTEON_SIMULATOR
select SYS_SUPPORTS_64BIT_KERNEL
select SYS_SUPPORTS_BIG_ENDIAN
select SYS_SUPPORTS_HIGHMEM
select SYS_SUPPORTS_HOTPLUG_CPU
select SYS_HAS_CPU_CAVIUM_OCTEON
help
The Octeon simulator is software performance model of the Cavium
......@@ -615,6 +616,7 @@ config CAVIUM_OCTEON_REFERENCE_BOARD
select SYS_SUPPORTS_64BIT_KERNEL
select SYS_SUPPORTS_BIG_ENDIAN
select SYS_SUPPORTS_HIGHMEM
select SYS_SUPPORTS_HOTPLUG_CPU
select SYS_HAS_EARLY_PRINTK
select SYS_HAS_CPU_CAVIUM_OCTEON
select SWAP_IO_SPACE
......
......@@ -501,3 +501,62 @@ asmlinkage void plat_irq_dispatch(void)
}
}
}
#ifdef CONFIG_HOTPLUG_CPU
static int is_irq_enabled_on_cpu(unsigned int irq, unsigned int cpu)
{
unsigned int isset;
#ifdef CONFIG_SMP
int coreid = cpu_logical_map(cpu);
#else
int coreid = cvmx_get_core_num();
#endif
int bit = (irq < OCTEON_IRQ_WDOG0) ?
irq - OCTEON_IRQ_WORKQ0 : irq - OCTEON_IRQ_WDOG0;
if (irq < 64) {
isset = (cvmx_read_csr(CVMX_CIU_INTX_EN0(coreid * 2)) &
(1ull << bit)) >> bit;
} else {
isset = (cvmx_read_csr(CVMX_CIU_INTX_EN1(coreid * 2 + 1)) &
(1ull << bit)) >> bit;
}
return isset;
}
void fixup_irqs(void)
{
int irq;
for (irq = OCTEON_IRQ_SW0; irq <= OCTEON_IRQ_TIMER; irq++)
octeon_irq_core_disable_local(irq);
for (irq = OCTEON_IRQ_WORKQ0; irq <= OCTEON_IRQ_GPIO15; irq++) {
if (is_irq_enabled_on_cpu(irq, smp_processor_id())) {
/* ciu irq migrates to next cpu */
octeon_irq_chip_ciu0.disable(irq);
octeon_irq_ciu0_set_affinity(irq, &cpu_online_map);
}
}
#if 0
for (irq = OCTEON_IRQ_MBOX0; irq <= OCTEON_IRQ_MBOX1; irq++)
octeon_irq_mailbox_mask(irq);
#endif
for (irq = OCTEON_IRQ_UART0; irq <= OCTEON_IRQ_BOOTDMA; irq++) {
if (is_irq_enabled_on_cpu(irq, smp_processor_id())) {
/* ciu irq migrates to next cpu */
octeon_irq_chip_ciu0.disable(irq);
octeon_irq_ciu0_set_affinity(irq, &cpu_online_map);
}
}
for (irq = OCTEON_IRQ_UART2; irq <= OCTEON_IRQ_RESERVED135; irq++) {
if (is_irq_enabled_on_cpu(irq, smp_processor_id())) {
/* ciu irq migrates to next cpu */
octeon_irq_chip_ciu1.disable(irq);
octeon_irq_ciu1_set_affinity(irq, &cpu_online_map);
}
}
}
#endif /* CONFIG_HOTPLUG_CPU */
/*
* (C) Copyright 2004, 2005 Cavium Networks
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of
* the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
* MA 02111-1307 USA
*/
#ifndef __OCTEON_BOOT_H__
#define __OCTEON_BOOT_H__
#include <linux/types.h>
struct boot_init_vector {
uint32_t stack_addr;
uint32_t code_addr;
uint32_t app_start_func_addr;
uint32_t k0_val;
uint32_t flags;
uint32_t boot_info_addr;
uint32_t pad;
uint32_t pad2;
};
/* similar to bootloader's linux_app_boot_info but without global data */
struct linux_app_boot_info {
uint32_t labi_signature;
uint32_t start_core0_addr;
uint32_t avail_coremask;
uint32_t pci_console_active;
uint32_t icache_prefetch_disable;
uint32_t InitTLBStart_addr;
uint32_t start_app_addr;
uint32_t cur_exception_base;
uint32_t no_mark_private_data;
uint32_t compact_flash_common_base_addr;
uint32_t compact_flash_attribute_base_addr;
uint32_t led_display_base_addr;
};
/* If not to copy a lot of bootloader's structures
here is only offset of requested member */
#define AVAIL_COREMASK_OFFSET_IN_LINUX_APP_BOOT_BLOCK 0x765c
/* hardcoded in bootloader */
#define LABI_ADDR_IN_BOOTLOADER 0x700
#define LINUX_APP_BOOT_BLOCK_NAME "linux-app-boot"
#define LABI_SIGNATURE 0xAABBCCDD
/* from uboot-headers/octeon_mem_map.h */
#define EXCEPTION_BASE_INCR (4 * 1024)
/* Increment size for exception base addresses (4k minimum) */
#define EXCEPTION_BASE_BASE 0
#define BOOTLOADER_PRIV_DATA_BASE (EXCEPTION_BASE_BASE + 0x800)
#define BOOTLOADER_BOOT_VECTOR (BOOTLOADER_PRIV_DATA_BASE)
#endif /* __OCTEON_BOOT_H__ */
......@@ -5,6 +5,7 @@
*
* Copyright (C) 2004-2008 Cavium Networks
*/
#include <linux/cpu.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/smp.h>
......@@ -19,10 +20,16 @@
#include <asm/octeon/octeon.h>
#include "octeon_boot.h"
volatile unsigned long octeon_processor_boot = 0xff;
volatile unsigned long octeon_processor_sp;
volatile unsigned long octeon_processor_gp;
#ifdef CONFIG_HOTPLUG_CPU
static unsigned int InitTLBStart_addr;
#endif
static irqreturn_t mailbox_interrupt(int irq, void *dev_id)
{
const int coreid = cvmx_get_core_num();
......@@ -67,8 +74,28 @@ static inline void octeon_send_ipi_mask(cpumask_t mask, unsigned int action)
}
/**
* Detect available CPUs, populate phys_cpu_present_map
* Detect available CPUs, populate cpu_possible_map
*/
static void octeon_smp_hotplug_setup(void)
{
#ifdef CONFIG_HOTPLUG_CPU
uint32_t labi_signature;
labi_signature =
cvmx_read64_uint32(CVMX_ADD_SEG(CVMX_MIPS_SPACE_XKPHYS,
LABI_ADDR_IN_BOOTLOADER +
offsetof(struct linux_app_boot_info,
labi_signature)));
if (labi_signature != LABI_SIGNATURE)
pr_err("The bootloader version on this board is incorrect\n");
InitTLBStart_addr =
cvmx_read64_uint32(CVMX_ADD_SEG(CVMX_MIPS_SPACE_XKPHYS,
LABI_ADDR_IN_BOOTLOADER +
offsetof(struct linux_app_boot_info,
InitTLBStart_addr)));
#endif
}
static void octeon_smp_setup(void)
{
const int coreid = cvmx_get_core_num();
......@@ -91,6 +118,9 @@ static void octeon_smp_setup(void)
cpus++;
}
}
cpu_present_map = cpu_possible_map;
octeon_smp_hotplug_setup();
}
/**
......@@ -128,6 +158,17 @@ static void octeon_init_secondary(void)
const int coreid = cvmx_get_core_num();
union cvmx_ciu_intx_sum0 interrupt_enable;
#ifdef CONFIG_HOTPLUG_CPU
unsigned int cur_exception_base;
cur_exception_base = cvmx_read64_uint32(
CVMX_ADD_SEG(CVMX_MIPS_SPACE_XKPHYS,
LABI_ADDR_IN_BOOTLOADER +
offsetof(struct linux_app_boot_info,
cur_exception_base)));
/* cur_exception_base is incremented in bootloader after setting */
write_c0_ebase((unsigned int)(cur_exception_base - EXCEPTION_BASE_INCR));
#endif
octeon_check_cpu_bist();
octeon_init_cvmcount();
/*
......@@ -199,6 +240,193 @@ static void octeon_cpus_done(void)
#endif
}
#ifdef CONFIG_HOTPLUG_CPU
/* State of each CPU. */
DEFINE_PER_CPU(int, cpu_state);
extern void fixup_irqs(void);
static DEFINE_SPINLOCK(smp_reserve_lock);
static int octeon_cpu_disable(void)
{
unsigned int cpu = smp_processor_id();
if (cpu == 0)
return -EBUSY;
spin_lock(&smp_reserve_lock);
cpu_clear(cpu, cpu_online_map);
cpu_clear(cpu, cpu_callin_map);
local_irq_disable();
fixup_irqs();
local_irq_enable();
flush_cache_all();
local_flush_tlb_all();
spin_unlock(&smp_reserve_lock);
return 0;
}
static void octeon_cpu_die(unsigned int cpu)
{
int coreid = cpu_logical_map(cpu);
uint32_t avail_coremask;
struct cvmx_bootmem_named_block_desc *block_desc;
#ifdef CONFIG_CAVIUM_OCTEON_WATCHDOG
/* Disable the watchdog */
cvmx_ciu_wdogx_t ciu_wdog;
ciu_wdog.u64 = cvmx_read_csr(CVMX_CIU_WDOGX(cpu));
ciu_wdog.s.mode = 0;
cvmx_write_csr(CVMX_CIU_WDOGX(cpu), ciu_wdog.u64);
#endif
while (per_cpu(cpu_state, cpu) != CPU_DEAD)
cpu_relax();
/*
* This is a bit complicated strategics of getting/settig available
* cores mask, copied from bootloader
*/
/* LINUX_APP_BOOT_BLOCK is initialized in bootoct binary */
block_desc = cvmx_bootmem_find_named_block(LINUX_APP_BOOT_BLOCK_NAME);
if (!block_desc) {
avail_coremask =
cvmx_read64_uint32(CVMX_ADD_SEG(CVMX_MIPS_SPACE_XKPHYS,
LABI_ADDR_IN_BOOTLOADER +
offsetof
(struct linux_app_boot_info,
avail_coremask)));
} else { /* alternative, already initialized */
avail_coremask =
cvmx_read64_uint32(CVMX_ADD_SEG(CVMX_MIPS_SPACE_XKPHYS,
block_desc->base_addr +
AVAIL_COREMASK_OFFSET_IN_LINUX_APP_BOOT_BLOCK));
}
avail_coremask |= 1 << coreid;
/* Setting avail_coremask for bootoct binary */
if (!block_desc) {
cvmx_write64_uint32(CVMX_ADD_SEG(CVMX_MIPS_SPACE_XKPHYS,
LABI_ADDR_IN_BOOTLOADER +
offsetof(struct linux_app_boot_info,
avail_coremask)),
avail_coremask);
} else {
cvmx_write64_uint32(CVMX_ADD_SEG(CVMX_MIPS_SPACE_XKPHYS,
block_desc->base_addr +
AVAIL_COREMASK_OFFSET_IN_LINUX_APP_BOOT_BLOCK),
avail_coremask);
}
pr_info("Reset core %d. Available Coremask = %x \n", coreid,
avail_coremask);
cvmx_write_csr(CVMX_CIU_PP_RST, 1 << coreid);
cvmx_write_csr(CVMX_CIU_PP_RST, 0);
}
void play_dead(void)
{
int coreid = cvmx_get_core_num();
idle_task_exit();
octeon_processor_boot = 0xff;
per_cpu(cpu_state, coreid) = CPU_DEAD;
while (1) /* core will be reset here */
;
}
extern void kernel_entry(unsigned long arg1, ...);
static void start_after_reset(void)
{
kernel_entry(0, 0, 0); /* set a2 = 0 for secondary core */
}
int octeon_update_boot_vector(unsigned int cpu)
{
int coreid = cpu_logical_map(cpu);
unsigned int avail_coremask;
struct cvmx_bootmem_named_block_desc *block_desc;
struct boot_init_vector *boot_vect =
(struct boot_init_vector *) cvmx_phys_to_ptr(0x0 +
BOOTLOADER_BOOT_VECTOR);
block_desc = cvmx_bootmem_find_named_block(LINUX_APP_BOOT_BLOCK_NAME);
if (!block_desc) {
avail_coremask =
cvmx_read64_uint32(CVMX_ADD_SEG(CVMX_MIPS_SPACE_XKPHYS,
LABI_ADDR_IN_BOOTLOADER +
offsetof(struct linux_app_boot_info,
avail_coremask)));
} else { /* alternative, already initialized */
avail_coremask =
cvmx_read64_uint32(CVMX_ADD_SEG(CVMX_MIPS_SPACE_XKPHYS,
block_desc->base_addr +
AVAIL_COREMASK_OFFSET_IN_LINUX_APP_BOOT_BLOCK));
}
if (!(avail_coremask & (1 << coreid))) {
/* core not available, assume, that catched by simple-executive */
cvmx_write_csr(CVMX_CIU_PP_RST, 1 << coreid);
cvmx_write_csr(CVMX_CIU_PP_RST, 0);
}
boot_vect[coreid].app_start_func_addr =
(uint32_t) (unsigned long) start_after_reset;
boot_vect[coreid].code_addr = InitTLBStart_addr;
CVMX_SYNC;
cvmx_write_csr(CVMX_CIU_NMI, (1 << coreid) & avail_coremask);
return 0;
}
static int __cpuinit octeon_cpu_callback(struct notifier_block *nfb,
unsigned long action, void *hcpu)
{
unsigned int cpu = (unsigned long)hcpu;
switch (action) {
case CPU_UP_PREPARE:
octeon_update_boot_vector(cpu);
break;
case CPU_ONLINE:
pr_info("Cpu %d online\n", cpu);
break;
case CPU_DEAD:
break;
}
return NOTIFY_OK;
}
static struct notifier_block __cpuinitdata octeon_cpu_notifier = {
.notifier_call = octeon_cpu_callback,
};
static int __cpuinit register_cavium_notifier(void)
{
register_hotcpu_notifier(&octeon_cpu_notifier);
return 0;
}
late_initcall(register_cavium_notifier);
#endif /* CONFIG_HOTPLUG_CPU */
struct plat_smp_ops octeon_smp_ops = {
.send_ipi_single = octeon_send_ipi_single,
.send_ipi_mask = octeon_send_ipi_mask,
......@@ -208,4 +436,8 @@ struct plat_smp_ops octeon_smp_ops = {
.boot_secondary = octeon_boot_secondary,
.smp_setup = octeon_smp_setup,
.prepare_cpus = octeon_prepare_cpus,
#ifdef CONFIG_HOTPLUG_CPU
.cpu_disable = octeon_cpu_disable,
.cpu_die = octeon_cpu_die,
#endif
};
......@@ -41,7 +41,7 @@ extern int __cpu_logical_map[NR_CPUS];
/* Octeon - Tell another core to flush its icache */
#define SMP_ICACHE_FLUSH 0x4
extern cpumask_t cpu_callin_map;
extern volatile cpumask_t cpu_callin_map;
extern void asmlinkage smp_bootstrap(void);
......
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