Messages in this thread Patch in this message | | | Date | Tue, 09 Jun 2009 17:13:38 -0700 | From | Greg KH <> | Subject | [patch 10/60] sparc64: Reschedule KGDB capture to a software interrupt. |
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-stable review patch. If anyone has any objections, please let us know.
------------------ From: David S. Miller <davem@davemloft.net>
[ Upstream commit 42cc77c861e8e850e86252bb5b1e12e006261973 ]
Otherwise it might interrupt switch_to() midstream and use half-cooked register window state.
Reported-by: Chris Torek <chris.torek@windriver.com> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de> --- arch/sparc/include/asm/pil.h | 1 + arch/sparc64/kernel/kgdb.c | 2 +- arch/sparc64/kernel/ttable.S | 8 +++++++- arch/sparc64/mm/ultra.S | 24 ++---------------------- 4 files changed, 11 insertions(+), 24 deletions(-)
--- a/arch/sparc64/kernel/kgdb.c +++ b/arch/sparc64/kernel/kgdb.c @@ -108,7 +108,7 @@ void gdb_regs_to_pt_regs(unsigned long * } #ifdef CONFIG_SMP -void smp_kgdb_capture_client(struct pt_regs *regs) +void smp_kgdb_capture_client(int irq, struct pt_regs *regs) { unsigned long flags; --- a/arch/sparc64/kernel/ttable.S +++ b/arch/sparc64/kernel/ttable.S @@ -63,7 +63,13 @@ tl0_irq6: TRAP_IRQ(smp_call_function_sin #else tl0_irq6: BTRAP(0x46) #endif -tl0_irq7: BTRAP(0x47) BTRAP(0x48) BTRAP(0x49) +tl0_irq7: BTRAP(0x47) +#ifdef CONFIG_KGDB +tl0_irq8: TRAP_IRQ(smp_kgdb_capture_client, 8) +#else +tl0_irq8: BTRAP(0x48) +#endif +tl0_irq9: BTRAP(0x49) tl0_irq10: BTRAP(0x4a) BTRAP(0x4b) BTRAP(0x4c) BTRAP(0x4d) tl0_irq14: TRAP_IRQ(timer_interrupt, 14) tl0_irq15: TRAP_IRQ(handler_irq, 15) --- a/arch/sparc64/mm/ultra.S +++ b/arch/sparc64/mm/ultra.S @@ -681,28 +681,8 @@ xcall_new_mmu_context_version: #ifdef CONFIG_KGDB .globl xcall_kgdb_capture xcall_kgdb_capture: -661: rdpr %pstate, %g2 - wrpr %g2, PSTATE_IG | PSTATE_AG, %pstate - .section .sun4v_2insn_patch, "ax" - .word 661b - nop - nop - .previous - - rdpr %pil, %g2 - wrpr %g0, 15, %pil - sethi %hi(109f), %g7 - ba,pt %xcc, etrap_irq -109: or %g7, %lo(109b), %g7 -#ifdef CONFIG_TRACE_IRQFLAGS - call trace_hardirqs_off - nop -#endif - call smp_kgdb_capture_client - add %sp, PTREGS_OFF, %o0 - /* Has to be a non-v9 branch due to the large distance. */ - ba rtrap_xcall - ldx [%sp + PTREGS_OFF + PT_V9_TSTATE], %l1 + wr %g0, (1 << PIL_KGDB_CAPTURE), %set_softint + retry #endif #endif /* CONFIG_SMP */ --- a/arch/sparc/include/asm/pil.h +++ b/arch/sparc/include/asm/pil.h @@ -18,5 +18,6 @@ #define PIL_SMP_CTX_NEW_VERSION 4 #define PIL_DEVICE_IRQ 5 #define PIL_SMP_CALL_FUNC_SNGL 6 +#define PIL_KGDB_CAPTURE 8 #endif /* !(_SPARC64_PIL_H) */
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