Commit 4f70f7a9 authored by David S. Miller's avatar David S. Miller

sparc64: Implement IRQ stacks.

Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent e3445682
......@@ -93,4 +93,8 @@ static inline unsigned long get_softint(void)
void __trigger_all_cpu_backtrace(void);
#define trigger_all_cpu_backtrace() __trigger_all_cpu_backtrace()
extern void *hardirq_stack[NR_CPUS];
extern void *softirq_stack[NR_CPUS];
#define __ARCH_HAS_DO_SOFTIRQ
#endif
......@@ -682,10 +682,32 @@ void ack_bad_irq(unsigned int virt_irq)
ino, virt_irq);
}
void *hardirq_stack[NR_CPUS];
void *softirq_stack[NR_CPUS];
static __attribute__((always_inline)) void *set_hardirq_stack(void)
{
void *orig_sp, *sp = hardirq_stack[smp_processor_id()];
__asm__ __volatile__("mov %%sp, %0" : "=r" (orig_sp));
if (orig_sp < sp ||
orig_sp > (sp + THREAD_SIZE)) {
sp += THREAD_SIZE - 192 - STACK_BIAS;
__asm__ __volatile__("mov %0, %%sp" : : "r" (sp));
}
return orig_sp;
}
static __attribute__((always_inline)) void restore_hardirq_stack(void *orig_sp)
{
__asm__ __volatile__("mov %0, %%sp" : : "r" (orig_sp));
}
void handler_irq(int irq, struct pt_regs *regs)
{
unsigned long pstate, bucket_pa;
struct pt_regs *old_regs;
void *orig_sp;
clear_softint(1 << irq);
......@@ -703,6 +725,8 @@ void handler_irq(int irq, struct pt_regs *regs)
"i" (PSTATE_IE)
: "memory");
orig_sp = set_hardirq_stack();
while (bucket_pa) {
struct irq_desc *desc;
unsigned long next_pa;
......@@ -719,10 +743,38 @@ void handler_irq(int irq, struct pt_regs *regs)
bucket_pa = next_pa;
}
restore_hardirq_stack(orig_sp);
irq_exit();
set_irq_regs(old_regs);
}
void do_softirq(void)
{
unsigned long flags;
if (in_interrupt())
return;
local_irq_save(flags);
if (local_softirq_pending()) {
void *orig_sp, *sp = softirq_stack[smp_processor_id()];
sp += THREAD_SIZE - 192 - STACK_BIAS;
__asm__ __volatile__("mov %%sp, %0\n\t"
"mov %1, %%sp"
: "=&r" (orig_sp)
: "r" (sp));
__do_softirq();
__asm__ __volatile__("mov %0, %%sp"
: : "r" (orig_sp));
}
local_irq_restore(flags);
}
#ifdef CONFIG_HOTPLUG_CPU
void fixup_irqs(void)
{
......
#ifndef _KSTACK_H
#define _KSTACK_H
#include <linux/thread_info.h>
#include <linux/sched.h>
#include <asm/ptrace.h>
#include <asm/irq.h>
/* SP must be STACK_BIAS adjusted already. */
static inline bool kstack_valid(struct thread_info *tp, unsigned long sp)
{
unsigned long base = (unsigned long) tp;
if (sp >= (base + sizeof(struct thread_info)) &&
sp <= (base + THREAD_SIZE - sizeof(struct sparc_stackf)))
return true;
base = (unsigned long) hardirq_stack[tp->cpu];
if (sp >= base &&
sp <= (base + THREAD_SIZE - sizeof(struct sparc_stackf)))
return true;
base = (unsigned long) softirq_stack[tp->cpu];
if (sp >= base &&
sp <= (base + THREAD_SIZE - sizeof(struct sparc_stackf)))
return true;
return false;
}
/* Does "regs" point to a valid pt_regs trap frame? */
static inline bool kstack_is_trap_frame(struct thread_info *tp, struct pt_regs *regs)
{
unsigned long base = (unsigned long) tp;
unsigned long addr = (unsigned long) regs;
if (addr >= base &&
addr <= (base + THREAD_SIZE - sizeof(*regs)))
goto check_magic;
base = (unsigned long) hardirq_stack[tp->cpu];
if (addr >= base &&
addr <= (base + THREAD_SIZE - sizeof(*regs)))
goto check_magic;
base = (unsigned long) softirq_stack[tp->cpu];
if (addr >= base &&
addr <= (base + THREAD_SIZE - sizeof(*regs)))
goto check_magic;
return false;
check_magic:
if ((regs->magic & ~0x1ff) == PT_REGS_MAGIC)
return true;
return false;
}
#endif /* _KSTACK_H */
......@@ -52,6 +52,8 @@
#include <asm/irq_regs.h>
#include <asm/smp.h>
#include "kstack.h"
static void sparc64_yield(int cpu)
{
if (tlb_type != hypervisor)
......@@ -235,19 +237,6 @@ void show_regs(struct pt_regs *regs)
struct global_reg_snapshot global_reg_snapshot[NR_CPUS];
static DEFINE_SPINLOCK(global_reg_snapshot_lock);
static bool kstack_valid(struct thread_info *tp, struct reg_window *rw)
{
unsigned long thread_base, fp;
thread_base = (unsigned long) tp;
fp = (unsigned long) rw;
if (fp < (thread_base + sizeof(struct thread_info)) ||
fp >= (thread_base + THREAD_SIZE))
return false;
return true;
}
static void __global_reg_self(struct thread_info *tp, struct pt_regs *regs,
int this_cpu)
{
......@@ -264,11 +253,11 @@ static void __global_reg_self(struct thread_info *tp, struct pt_regs *regs,
rw = (struct reg_window *)
(regs->u_regs[UREG_FP] + STACK_BIAS);
if (kstack_valid(tp, rw)) {
if (kstack_valid(tp, (unsigned long) rw)) {
global_reg_snapshot[this_cpu].i7 = rw->ins[7];
rw = (struct reg_window *)
(rw->ins[6] + STACK_BIAS);
if (kstack_valid(tp, rw))
if (kstack_valid(tp, (unsigned long) rw))
global_reg_snapshot[this_cpu].rpc = rw->ins[7];
}
} else {
......@@ -828,7 +817,7 @@ asmlinkage int sparc_execve(struct pt_regs *regs)
unsigned long get_wchan(struct task_struct *task)
{
unsigned long pc, fp, bias = 0;
unsigned long thread_info_base;
struct thread_info *tp;
struct reg_window *rw;
unsigned long ret = 0;
int count = 0;
......@@ -837,14 +826,12 @@ unsigned long get_wchan(struct task_struct *task)
task->state == TASK_RUNNING)
goto out;
thread_info_base = (unsigned long) task_stack_page(task);
tp = task_thread_info(task);
bias = STACK_BIAS;
fp = task_thread_info(task)->ksp + bias;
do {
/* Bogus frame pointer? */
if (fp < (thread_info_base + sizeof(struct thread_info)) ||
fp >= (thread_info_base + THREAD_SIZE))
if (!kstack_valid(tp, fp))
break;
rw = (struct reg_window *) fp;
pc = rw->ins[7];
......
......@@ -5,6 +5,8 @@
#include <asm/ptrace.h>
#include <asm/stacktrace.h>
#include "kstack.h"
void save_stack_trace(struct stack_trace *trace)
{
unsigned long ksp, fp, thread_base;
......@@ -24,17 +26,13 @@ void save_stack_trace(struct stack_trace *trace)
struct pt_regs *regs;
unsigned long pc;
/* Bogus frame pointer? */
if (fp < (thread_base + sizeof(struct thread_info)) ||
fp > (thread_base + THREAD_SIZE - sizeof(struct sparc_stackf)))
if (!kstack_valid(tp, fp))
break;
sf = (struct sparc_stackf *) fp;
regs = (struct pt_regs *) (sf + 1);
if (((unsigned long)regs <=
(thread_base + THREAD_SIZE - sizeof(*regs))) &&
(regs->magic & ~0x1ff) == PT_REGS_MAGIC) {
if (kstack_is_trap_frame(tp, regs)) {
if (!(regs->tstate & TSTATE_PRIV))
break;
pc = regs->tpc;
......
......@@ -39,6 +39,7 @@
#include <asm/prom.h>
#include "entry.h"
#include "kstack.h"
/* When an irrecoverable trap occurs at tl > 0, the trap entry
* code logs the trap state registers at every level in the trap
......@@ -2115,14 +2116,12 @@ void show_stack(struct task_struct *tsk, unsigned long *_ksp)
struct pt_regs *regs;
unsigned long pc;
/* Bogus frame pointer? */
if (fp < (thread_base + sizeof(struct thread_info)) ||
fp >= (thread_base + THREAD_SIZE))
if (!kstack_valid(tp, fp))
break;
sf = (struct sparc_stackf *) fp;
regs = (struct pt_regs *) (sf + 1);
if ((regs->magic & ~0x1ff) == PT_REGS_MAGIC) {
if (kstack_is_trap_frame(tp, regs)) {
if (!(regs->tstate & TSTATE_PRIV))
break;
pc = regs->tpc;
......
......@@ -49,6 +49,28 @@ mcount:
cmp %sp, %g3
bg,pt %xcc, 1f
nop
lduh [%g6 + TI_CPU], %g1
sethi %hi(hardirq_stack), %g3
or %g3, %lo(hardirq_stack), %g3
sllx %g1, 3, %g1
ldx [%g3 + %g1], %g7
sub %g7, STACK_BIAS, %g7
cmp %sp, %g7
bleu,pt %xcc, 2f
sethi %hi(THREAD_SIZE), %g3
add %g7, %g3, %g7
cmp %sp, %g7
blu,pn %xcc, 1f
2: sethi %hi(softirq_stack), %g3
or %g3, %lo(softirq_stack), %g3
ldx [%g3 + %g1], %g7
cmp %sp, %g7
bleu,pt %xcc, 2f
sethi %hi(THREAD_SIZE), %g3
add %g7, %g3, %g7
cmp %sp, %g7
blu,pn %xcc, 1f
nop
/* If we are already on ovstack, don't hop onto it
* again, we are already trying to output the stack overflow
* message.
......
......@@ -49,6 +49,7 @@
#include <asm/sstate.h>
#include <asm/mdesc.h>
#include <asm/cpudata.h>
#include <asm/irq.h>
#define MAX_PHYS_ADDRESS (1UL << 42UL)
#define KPTE_BITMAP_CHUNK_SZ (256UL * 1024UL * 1024UL)
......@@ -1771,6 +1772,16 @@ void __init paging_init(void)
if (tlb_type == hypervisor)
sun4v_mdesc_init();
/* Once the OF device tree and MDESC have been setup, we know
* the list of possible cpus. Therefore we can allocate the
* IRQ stacks.
*/
for_each_possible_cpu(i) {
/* XXX Use node local allocations... XXX */
softirq_stack[i] = __va(lmb_alloc(THREAD_SIZE, THREAD_SIZE));
hardirq_stack[i] = __va(lmb_alloc(THREAD_SIZE, THREAD_SIZE));
}
/* Setup bootmem... */
last_valid_pfn = end_pfn = bootmem_init(phys_base);
......
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