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MIPS: Implement HAVE_CONTEXT_TRACKING.

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This enables support for CONFIG_NO_HZ_FULL.

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
Ralf Baechle
2013-05-29 01:07:19 +02:00
parent e7f3b48af7
commit c3fc5cd5c5
8 changed files with 108 additions and 19 deletions
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74
arch/mips/kernel/traps.c
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@@ -13,6 +13,7 @@
*/
#include <linux/bug.h>
#include <linux/compiler.h>
#include <linux/context_tracking.h>
#include <linux/kexec.h>
#include <linux/init.h>
#include <linux/kernel.h>
@@ -423,7 +424,9 @@ asmlinkage void do_be(struct pt_regs *regs)
const struct exception_table_entry *fixup = NULL;
int data = regs->cp0_cause & 4;
int action = MIPS_BE_FATAL;
enum ctx_state prev_state;
prev_state = exception_enter();
/* XXX For now. Fixme, this searches the wrong table ... */
if (data && !user_mode(regs))
fixup = search_dbe_tables(exception_epc(regs));
@@ -436,11 +439,11 @@ asmlinkage void do_be(struct pt_regs *regs)
switch (action) {
case MIPS_BE_DISCARD:
return;
goto out;
case MIPS_BE_FIXUP:
if (fixup) {
regs->cp0_epc = fixup->nextinsn;
return;
goto out;
}
break;
default:
@@ -455,10 +458,13 @@ asmlinkage void do_be(struct pt_regs *regs)
field, regs->cp0_epc, field, regs->regs[31]);
if (notify_die(DIE_OOPS, "bus error", regs, 0, regs_to_trapnr(regs), SIGBUS)
== NOTIFY_STOP)
return;
goto out;
die_if_kernel("Oops", regs);
force_sig(SIGBUS, current);
out:
exception_exit(prev_state);
}
/*
@@ -673,8 +679,10 @@ static int simulate_sync(struct pt_regs *regs, unsigned int opcode)
asmlinkage void do_ov(struct pt_regs *regs)
{
enum ctx_state prev_state;
siginfo_t info;
prev_state = exception_enter();
die_if_kernel("Integer overflow", regs);
info.si_code = FPE_INTOVF;
@@ -682,6 +690,7 @@ asmlinkage void do_ov(struct pt_regs *regs)
info.si_errno = 0;
info.si_addr = (void __user *) regs->cp0_epc;
force_sig_info(SIGFPE, &info, current);
exception_exit(prev_state);
}
int process_fpemu_return(int sig, void __user *fault_addr)
@@ -713,11 +722,13 @@ int process_fpemu_return(int sig, void __user *fault_addr)
*/
asmlinkage void do_fpe(struct pt_regs *regs, unsigned long fcr31)
{
enum ctx_state prev_state;
siginfo_t info = {0};
prev_state = exception_enter();
if (notify_die(DIE_FP, "FP exception", regs, 0, regs_to_trapnr(regs), SIGFPE)
== NOTIFY_STOP)
return;
goto out;
die_if_kernel("FP exception in kernel code", regs);
if (fcr31 & FPU_CSR_UNI_X) {
@@ -753,7 +764,7 @@ asmlinkage void do_fpe(struct pt_regs *regs, unsigned long fcr31)
/* If something went wrong, signal */
process_fpemu_return(sig, fault_addr);
return;
goto out;
} else if (fcr31 & FPU_CSR_INV_X)
info.si_code = FPE_FLTINV;
else if (fcr31 & FPU_CSR_DIV_X)
@@ -770,6 +781,9 @@ asmlinkage void do_fpe(struct pt_regs *regs, unsigned long fcr31)
info.si_errno = 0;
info.si_addr = (void __user *) regs->cp0_epc;
force_sig_info(SIGFPE, &info, current);
out:
exception_exit(prev_state);
}
static void do_trap_or_bp(struct pt_regs *regs, unsigned int code,
@@ -835,9 +849,11 @@ static void do_trap_or_bp(struct pt_regs *regs, unsigned int code,
asmlinkage void do_bp(struct pt_regs *regs)
{
unsigned int opcode, bcode;
enum ctx_state prev_state;
unsigned long epc;
u16 instr[2];
prev_state = exception_enter();
if (get_isa16_mode(regs->cp0_epc)) {
/* Calculate EPC. */
epc = exception_epc(regs);
@@ -852,7 +868,7 @@ asmlinkage void do_bp(struct pt_regs *regs)
goto out_sigsegv;
bcode = (instr[0] >> 6) & 0x3f;
do_trap_or_bp(regs, bcode, "Break");
return;
goto out;
}
} else {
if (__get_user(opcode, (unsigned int __user *) exception_epc(regs)))
@@ -876,12 +892,12 @@ asmlinkage void do_bp(struct pt_regs *regs)
switch (bcode) {
case BRK_KPROBE_BP:
if (notify_die(DIE_BREAK, "debug", regs, bcode, regs_to_trapnr(regs), SIGTRAP) == NOTIFY_STOP)
return;
goto out;
else
break;
case BRK_KPROBE_SSTEPBP:
if (notify_die(DIE_SSTEPBP, "single_step", regs, bcode, regs_to_trapnr(regs), SIGTRAP) == NOTIFY_STOP)
return;
goto out;
else
break;
default:
@@ -889,18 +905,24 @@ asmlinkage void do_bp(struct pt_regs *regs)
}
do_trap_or_bp(regs, bcode, "Break");
out:
exception_exit(prev_state);
return;
out_sigsegv:
force_sig(SIGSEGV, current);
goto out;
}
asmlinkage void do_tr(struct pt_regs *regs)
{
u32 opcode, tcode = 0;
enum ctx_state prev_state;
u16 instr[2];
unsigned long epc = msk_isa16_mode(exception_epc(regs));
prev_state = exception_enter();
if (get_isa16_mode(regs->cp0_epc)) {
if (__get_user(instr[0], (u16 __user *)(epc + 0)) ||
__get_user(instr[1], (u16 __user *)(epc + 2)))
@@ -918,10 +940,14 @@ asmlinkage void do_tr(struct pt_regs *regs)
}
do_trap_or_bp(regs, tcode, "Trap");
out:
exception_exit(prev_state);
return;
out_sigsegv:
force_sig(SIGSEGV, current);
goto out;
}
asmlinkage void do_ri(struct pt_regs *regs)
@@ -929,17 +955,19 @@ asmlinkage void do_ri(struct pt_regs *regs)
unsigned int __user *epc = (unsigned int __user *)exception_epc(regs);
unsigned long old_epc = regs->cp0_epc;
unsigned long old31 = regs->regs[31];
enum ctx_state prev_state;
unsigned int opcode = 0;
int status = -1;
prev_state = exception_enter();
if (notify_die(DIE_RI, "RI Fault", regs, 0, regs_to_trapnr(regs), SIGILL)
== NOTIFY_STOP)
return;
goto out;
die_if_kernel("Reserved instruction in kernel code", regs);
if (unlikely(compute_return_epc(regs) < 0))
return;
goto out;
if (get_isa16_mode(regs->cp0_epc)) {
unsigned short mmop[2] = { 0 };
@@ -974,6 +1002,9 @@ asmlinkage void do_ri(struct pt_regs *regs)
regs->regs[31] = old31;
force_sig(status, current);
}
out:
exception_exit(prev_state);
}
/*
@@ -1040,6 +1071,7 @@ static int default_cu2_call(struct notifier_block *nfb, unsigned long action,
asmlinkage void do_cpu(struct pt_regs *regs)
{
enum ctx_state prev_state;
unsigned int __user *epc;
unsigned long old_epc, old31;
unsigned int opcode;
@@ -1047,6 +1079,7 @@ asmlinkage void do_cpu(struct pt_regs *regs)
int status;
unsigned long __maybe_unused flags;
prev_state = exception_enter();
die_if_kernel("do_cpu invoked from kernel context!", regs);
cpid = (regs->cp0_cause >> CAUSEB_CE) & 3;
@@ -1060,7 +1093,7 @@ asmlinkage void do_cpu(struct pt_regs *regs)
status = -1;
if (unlikely(compute_return_epc(regs) < 0))
return;
goto out;
if (get_isa16_mode(regs->cp0_epc)) {
unsigned short mmop[2] = { 0 };
@@ -1093,7 +1126,7 @@ asmlinkage void do_cpu(struct pt_regs *regs)
force_sig(status, current);
}
return;
goto out;
case 3:
/*
@@ -1131,19 +1164,26 @@ asmlinkage void do_cpu(struct pt_regs *regs)
mt_ase_fp_affinity();
}
return;
goto out;
case 2:
raw_notifier_call_chain(&cu2_chain, CU2_EXCEPTION, regs);
return;
goto out;
}
force_sig(SIGILL, current);
out:
exception_exit(prev_state);
}
asmlinkage void do_mdmx(struct pt_regs *regs)
{
enum ctx_state prev_state;
prev_state = exception_enter();
force_sig(SIGILL, current);
exception_exit(prev_state);
}
/*
@@ -1151,8 +1191,10 @@ asmlinkage void do_mdmx(struct pt_regs *regs)
*/
asmlinkage void do_watch(struct pt_regs *regs)
{
enum ctx_state prev_state;
u32 cause;
prev_state = exception_enter();
/*
* Clear WP (bit 22) bit of cause register so we don't loop
* forever.
@@ -1174,13 +1216,16 @@ asmlinkage void do_watch(struct pt_regs *regs)
mips_clear_watch_registers();
local_irq_enable();
}
exception_exit(prev_state);
}
asmlinkage void do_mcheck(struct pt_regs *regs)
{
const int field = 2 * sizeof(unsigned long);
int multi_match = regs->cp0_status & ST0_TS;
enum ctx_state prev_state;
prev_state = exception_enter();
show_regs(regs);
if (multi_match) {
@@ -1202,6 +1247,7 @@ asmlinkage void do_mcheck(struct pt_regs *regs)
panic("Caught Machine Check exception - %scaused by multiple "
"matching entries in the TLB.",
(multi_match) ? "" : "not ");
exception_exit(prev_state);
}
asmlinkage void do_mt(struct pt_regs *regs)