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Merge master.kernel.org:/pub/scm/linux/kernel/git/jejb/voyager-2.6

Browse source 
* master.kernel.org:/pub/scm/linux/kernel/git/jejb/voyager-2.6:
  [VOYAGER] add smp alternatives
  [VOYAGER] Use modern techniques to setup and teardown low identiy mappings.
  [VOYAGER] Convert the monitor thread to use the kthread API
  [VOYAGER] clockevents driver: bring voyager in to line
  [VOYAGER] clockevents: correct boot cpu is zero assumption
  [VOYAGER] add smp_call_function_single
This commit is contained in:
Linus Torvalds 2007-05-05 13:30:23 -07:00
parent aa12b2842a d6444514b8
commit fabb5c4e4a
6 changed files with 83 additions and 101 deletions
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2
arch/i386/kernel/i8253.c
View file

@ -110,7 +110,7 @@ void __init setup_pit_timer(void)
* Start pit with the boot cpu mask and make it global after the
* IO_APIC has been initialized.
*/
pit_clockevent.cpumask = cpumask_of_cpu(0);
pit_clockevent.cpumask = cpumask_of_cpu(smp_processor_id());
pit_clockevent.mult = div_sc(CLOCK_TICK_RATE, NSEC_PER_SEC, 32);
pit_clockevent.max_delta_ns =
clockevent_delta2ns(0x7FFF, &pit_clockevent);

8
arch/i386/mach-voyager/setup.c
View file

@ -40,10 +40,16 @@ void __init trap_init_hook(void)
{
}
static struct irqaction irq0 = { timer_interrupt, IRQF_DISABLED, CPU_MASK_NONE, "timer", NULL, NULL};
static struct irqaction irq0 = {
.handler = timer_interrupt,
.flags = IRQF_DISABLED | IRQF_NOBALANCING,
.mask = CPU_MASK_NONE,
.name = "timer"
};
void __init time_init_hook(void)
{
irq0.mask = cpumask_of_cpu(safe_smp_processor_id());
setup_irq(0, &irq0);
}

4
arch/i386/mach-voyager/voyager_cat.c
View file

@ -1111,7 +1111,7 @@ voyager_cat_do_common_interrupt(void)
printk(KERN_ERR "Voyager front panel switch turned off\n");
voyager_status.switch_off = 1;
voyager_status.request_from_kernel = 1;
up(&kvoyagerd_sem);
wake_up_process(voyager_thread);
}
/* Tell the hardware we're taking care of the
* shutdown, otherwise it will power the box off
@ -1157,7 +1157,7 @@ voyager_cat_do_common_interrupt(void)
outb(VOYAGER_CAT_END, CAT_CMD);
voyager_status.power_fail = 1;
voyager_status.request_from_kernel = 1;
up(&kvoyagerd_sem);
wake_up_process(voyager_thread);
}

95
arch/i386/mach-voyager/voyager_smp.c
View file

@ -536,15 +536,6 @@ do_boot_cpu(__u8 cpu)
& ~( voyager_extended_vic_processors
& voyager_allowed_boot_processors);
/* For the 486, we can't use the 4Mb page table trick, so
* must map a region of memory */
#ifdef CONFIG_M486
int i;
unsigned long *page_table_copies = (unsigned long *)
__get_free_page(GFP_KERNEL);
#endif
pgd_t orig_swapper_pg_dir0;
/* This is an area in head.S which was used to set up the
* initial kernel stack. We need to alter this to give the
* booting CPU a new stack (taken from its idle process) */
@ -573,6 +564,8 @@ do_boot_cpu(__u8 cpu)
hijack_source.idt.Segment = (start_phys_address >> 4) & 0xFFFF;
cpucount++;
alternatives_smp_switch(1);
idle = fork_idle(cpu);
if(IS_ERR(idle))
panic("failed fork for CPU%d", cpu);
@ -595,24 +588,11 @@ do_boot_cpu(__u8 cpu)
VDEBUG(("VOYAGER SMP: Booting CPU%d at 0x%lx[%x:%x], stack %p\n", cpu,
(unsigned long)hijack_source.val, hijack_source.idt.Segment,
hijack_source.idt.Offset, stack_start.esp));
/* set the original swapper_pg_dir[0] to map 0 to 4Mb transparently
* (so that the booting CPU can find start_32 */
orig_swapper_pg_dir0 = swapper_pg_dir[0];
#ifdef CONFIG_M486
if(page_table_copies == NULL)
panic("No free memory for 486 page tables\n");
for(i = 0; i < PAGE_SIZE/sizeof(unsigned long); i++)
page_table_copies[i] = (i * PAGE_SIZE)
| _PAGE_RW | _PAGE_USER | _PAGE_PRESENT;
((unsigned long *)swapper_pg_dir)[0] =
((virt_to_phys(page_table_copies)) & PAGE_MASK)
| _PAGE_RW | _PAGE_USER | _PAGE_PRESENT;
#else
((unsigned long *)swapper_pg_dir)[0] =
(virt_to_phys(pg0) & PAGE_MASK)
| _PAGE_RW | _PAGE_USER | _PAGE_PRESENT;
#endif
/* init lowmem identity mapping */
clone_pgd_range(swapper_pg_dir, swapper_pg_dir + USER_PGD_PTRS,
min_t(unsigned long, KERNEL_PGD_PTRS, USER_PGD_PTRS));
flush_tlb_all();
if(quad_boot) {
printk("CPU %d: non extended Quad boot\n", cpu);
@ -655,11 +635,7 @@ do_boot_cpu(__u8 cpu)
udelay(100);
}
/* reset the page table */
swapper_pg_dir[0] = orig_swapper_pg_dir0;
local_flush_tlb();
#ifdef CONFIG_M486
free_page((unsigned long)page_table_copies);
#endif
zap_low_mappings();
if (cpu_booted_map) {
VDEBUG(("CPU%d: Booted successfully, back in CPU %d\n",
@ -1082,20 +1058,11 @@ smp_call_function_interrupt(void)
}
}
/* Call this function on all CPUs using the function_interrupt above
<func> The function to run. This must be fast and non-blocking.
<info> An arbitrary pointer to pass to the function.
<retry> If true, keep retrying until ready.
<wait> If true, wait until function has completed on other CPUs.
[RETURNS] 0 on success, else a negative status code. Does not return until
remote CPUs are nearly ready to execute <<func>> or are or have executed.
*/
int
smp_call_function (void (*func) (void *info), void *info, int retry,
int wait)
static int
__smp_call_function_mask (void (*func) (void *info), void *info, int retry,
int wait, __u32 mask)
{
struct call_data_struct data;
__u32 mask = cpus_addr(cpu_online_map)[0];
mask &= ~(1<<smp_processor_id());
@ -1116,7 +1083,7 @@ smp_call_function (void (*func) (void *info), void *info, int retry,
call_data = &data;
wmb();
/* Send a message to all other CPUs and wait for them to respond */
send_CPI_allbutself(VIC_CALL_FUNCTION_CPI);
send_CPI(mask, VIC_CALL_FUNCTION_CPI);
/* Wait for response */
while (data.started)
@ -1130,8 +1097,48 @@ smp_call_function (void (*func) (void *info), void *info, int retry,
return 0;
}
/* Call this function on all CPUs using the function_interrupt above
<func> The function to run. This must be fast and non-blocking.
<info> An arbitrary pointer to pass to the function.
<retry> If true, keep retrying until ready.
<wait> If true, wait until function has completed on other CPUs.
[RETURNS] 0 on success, else a negative status code. Does not return until
remote CPUs are nearly ready to execute <<func>> or are or have executed.
*/
int
smp_call_function(void (*func) (void *info), void *info, int retry,
int wait)
{
__u32 mask = cpus_addr(cpu_online_map)[0];
return __smp_call_function_mask(func, info, retry, wait, mask);
}
EXPORT_SYMBOL(smp_call_function);
/*
* smp_call_function_single - Run a function on another CPU
* @func: The function to run. This must be fast and non-blocking.
* @info: An arbitrary pointer to pass to the function.
* @nonatomic: Currently unused.
* @wait: If true, wait until function has completed on other CPUs.
*
* Retrurns 0 on success, else a negative status code.
*
* Does not return until the remote CPU is nearly ready to execute <func>
* or is or has executed.
*/
int
smp_call_function_single(int cpu, void (*func) (void *info), void *info,
int nonatomic, int wait)
{
__u32 mask = 1 << cpu;
return __smp_call_function_mask(func, info, nonatomic, wait, mask);
}
EXPORT_SYMBOL(smp_call_function_single);
/* Sorry about the name. In an APIC based system, the APICs
* themselves are programmed to send a timer interrupt. This is used
* by linux to reschedule the processor. Voyager doesn't have this,

69
arch/i386/mach-voyager/voyager_thread.c
View file

@ -24,33 +24,16 @@
#include <linux/kmod.h>
#include <linux/completion.h>
#include <linux/sched.h>
#include <linux/kthread.h>
#include <asm/desc.h>
#include <asm/voyager.h>
#include <asm/vic.h>
#include <asm/mtrr.h>
#include <asm/msr.h>
#define THREAD_NAME "kvoyagerd"
/* external variables */
int kvoyagerd_running = 0;
DECLARE_MUTEX_LOCKED(kvoyagerd_sem);
static int thread(void *);
static __u8 set_timeout = 0;
/* Start the machine monitor thread. Return 1 if OK, 0 if fail */
static int __init
voyager_thread_start(void)
{
if(kernel_thread(thread, NULL, CLONE_KERNEL) < 0) {
/* This is serious, but not fatal */
printk(KERN_ERR "Voyager: Failed to create system monitor thread!!!\n");
return 1;
}
return 0;
}
struct task_struct *voyager_thread;
static __u8 set_timeout;
static int
execute(const char *string)
@ -110,31 +93,15 @@ check_continuing_condition(void)
}
}
static void
wakeup(unsigned long unused)
{
up(&kvoyagerd_sem);
}
static int
thread(void *unused)
{
struct timer_list wakeup_timer;
kvoyagerd_running = 1;
daemonize(THREAD_NAME);
set_timeout = 0;
init_timer(&wakeup_timer);
sigfillset(&current->blocked);
printk(KERN_NOTICE "Voyager starting monitor thread\n");
for(;;) {
down_interruptible(&kvoyagerd_sem);
for (;;) {
set_current_state(TASK_INTERRUPTIBLE);
schedule_timeout(set_timeout ? HZ : MAX_SCHEDULE_TIMEOUT);
VDEBUG(("Voyager Daemon awoken\n"));
if(voyager_status.request_from_kernel == 0) {
/* probably awoken from timeout */
@ -143,20 +110,26 @@ thread(void *unused)
check_from_kernel();
voyager_status.request_from_kernel = 0;
}
if(set_timeout) {
del_timer(&wakeup_timer);
wakeup_timer.expires = HZ + jiffies;
wakeup_timer.function = wakeup;
add_timer(&wakeup_timer);
}
}
}
static int __init
voyager_thread_start(void)
{
voyager_thread = kthread_run(thread, NULL, "kvoyagerd");
if (IS_ERR(voyager_thread)) {
printk(KERN_ERR "Voyager: Failed to create system monitor thread.\n");
return PTR_ERR(voyager_thread);
}
return 0;
}
static void __exit
voyager_thread_stop(void)
{
/* FIXME: do nothing at the moment */
kthread_stop(voyager_thread);
}
module_init(voyager_thread_start);
//module_exit(voyager_thread_stop);
module_exit(voyager_thread_stop);

6
include/asm-i386/voyager.h
View file

@ -487,15 +487,11 @@ extern struct voyager_qic_cpi *voyager_quad_cpi_addr[NR_CPUS];
extern struct voyager_SUS *voyager_SUS;
/* variables exported always */
extern struct task_struct *voyager_thread;
extern int voyager_level;
extern int kvoyagerd_running;
extern struct semaphore kvoyagerd_sem;
extern struct voyager_status voyager_status;
/* functions exported by the voyager and voyager_smp modules */
extern int voyager_cat_readb(__u8 module, __u8 asic, int reg);
extern void voyager_cat_init(void);
extern void voyager_detect(struct voyager_bios_info *);