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powerpc: Add support for using doorbells for SMP IPI

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The e500mc supports the new msgsnd/doorbell mechanisms that were added in
the Power ISA 2.05 architecture.  We use the normal level doorbell for
doing SMP IPIs at this point.

Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Kumar Gala 2009-02-12 13:54:53 +00:00 committed by Benjamin Herrenschmidt
parent 6ed8d12849
commit 620165f971
6 changed files with 117 additions and 3 deletions
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4
arch/powerpc/include/asm/cputable.h
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@ -145,6 +145,7 @@ extern const char *powerpc_base_platform;
#define CPU_FTR_USE_TB ASM_CONST(0x0000000000000040)
#define CPU_FTR_L2CSR ASM_CONST(0x0000000000000080)
#define CPU_FTR_601 ASM_CONST(0x0000000000000100)
#define CPU_FTR_DBELL ASM_CONST(0x0000000000000200)
#define CPU_FTR_CAN_NAP ASM_CONST(0x0000000000000400)
#define CPU_FTR_L3CR ASM_CONST(0x0000000000000800)
#define CPU_FTR_L3_DISABLE_NAP ASM_CONST(0x0000000000001000)
@ -373,7 +374,8 @@ extern const char *powerpc_base_platform;
CPU_FTR_NODSISRALIGN | CPU_FTR_NOEXECUTE)
#define CPU_FTRS_E500MC (CPU_FTR_MAYBE_CAN_DOZE | CPU_FTR_USE_TB | \
CPU_FTR_MAYBE_CAN_NAP | CPU_FTR_NODSISRALIGN | \
CPU_FTR_L2CSR | CPU_FTR_LWSYNC | CPU_FTR_NOEXECUTE)
CPU_FTR_L2CSR | CPU_FTR_LWSYNC | CPU_FTR_NOEXECUTE | \
CPU_FTR_DBELL)
#define CPU_FTRS_GENERIC_32 (CPU_FTR_COMMON | CPU_FTR_NODSISRALIGN)
/* 64-bit CPUs */

43
arch/powerpc/include/asm/dbell.h Normal file
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@ -0,0 +1,43 @@
/*
* Copyright 2009 Freescale Semicondutor, Inc.
*
* 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.
*
* provides masks and opcode images for use by code generation, emulation
* and for instructions that older assemblers might not know about
*/
#ifndef _ASM_POWERPC_DBELL_H
#define _ASM_POWERPC_DBELL_H
#include <linux/smp.h>
#include <linux/threads.h>
#include <asm/ppc-opcode.h>
#define PPC_DBELL_MSG_BRDCAST (0x04000000)
#define PPC_DBELL_TYPE(x) (((x) & 0xf) << 28)
enum ppc_dbell {
PPC_DBELL = 0, /* doorbell */
PPC_DBELL_CRIT = 1, /* critical doorbell */
PPC_G_DBELL = 2, /* guest doorbell */
PPC_G_DBELL_CRIT = 3, /* guest critical doorbell */
PPC_G_DBELL_MC = 4, /* guest mcheck doorbell */
};
#ifdef CONFIG_SMP
extern unsigned long dbell_smp_message[NR_CPUS];
extern void smp_dbell_message_pass(int target, int msg);
#endif
static inline void ppc_msgsnd(enum ppc_dbell type, u32 flags, u32 tag)
{
u32 msg = PPC_DBELL_TYPE(type) | (flags & PPC_DBELL_MSG_BRDCAST) |
(tag & 0x07ffffff);
__asm__ __volatile__ (PPC_MSGSND(%0) : : "r" (msg));
}
#endif /* _ASM_POWERPC_DBELL_H */

2
arch/powerpc/kernel/Makefile
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@ -59,7 +59,7 @@ obj-$(CONFIG_HIBERNATION) += swsusp.o suspend.o \
obj64-$(CONFIG_HIBERNATION) += swsusp_asm64.o
obj-$(CONFIG_MODULES) += module.o module_$(CONFIG_WORD_SIZE).o
obj-$(CONFIG_44x) += cpu_setup_44x.o
obj-$(CONFIG_FSL_BOOKE) += cpu_setup_fsl_booke.o
obj-$(CONFIG_FSL_BOOKE) += cpu_setup_fsl_booke.o dbell.o
extra-$(CONFIG_PPC_STD_MMU) := head_32.o
extra-$(CONFIG_PPC64) := head_64.o

44
arch/powerpc/kernel/dbell.c Normal file
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@ -0,0 +1,44 @@
/*
* Author: Kumar Gala <galak@kernel.crashing.org>
*
* Copyright 2009 Freescale Semiconductor Inc.
*
* 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.
*/
#include <linux/stddef.h>
#include <linux/kernel.h>
#include <linux/smp.h>
#include <linux/threads.h>
#include <asm/dbell.h>
#ifdef CONFIG_SMP
unsigned long dbell_smp_message[NR_CPUS];
void smp_dbell_message_pass(int target, int msg)
{
int i;
if(target < NR_CPUS) {
set_bit(msg, &dbell_smp_message[target]);
ppc_msgsnd(PPC_DBELL, 0, target);
}
else if(target == MSG_ALL_BUT_SELF) {
for_each_online_cpu(i) {
if (i == smp_processor_id())
continue;
set_bit(msg, &dbell_smp_message[i]);
ppc_msgsnd(PPC_DBELL, 0, i);
}
}
else { /* target == MSG_ALL */
for_each_online_cpu(i)
set_bit(msg, &dbell_smp_message[i]);
ppc_msgsnd(PPC_DBELL, PPC_DBELL_MSG_BRDCAST, 0);
}
}
#endif

6
arch/powerpc/kernel/head_fsl_booke.S
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@ -698,7 +698,9 @@ interrupt_base:
/* Performance Monitor */
EXCEPTION(0x2060, PerformanceMonitor, performance_monitor_exception, EXC_XFER_STD)
EXCEPTION(0x2070, Doorbell, unknown_exception, EXC_XFER_STD)
EXCEPTION(0x2070, Doorbell, doorbell_exception, EXC_XFER_STD)
CRITICAL_EXCEPTION(0x2080, CriticalDoorbell, unknown_exception)
/* Debug Interrupt */
DEBUG_DEBUG_EXCEPTION
@ -921,6 +923,8 @@ _GLOBAL(__setup_e500mc_ivors)
mtspr SPRN_IVOR35,r3
li r3,Doorbell@l
mtspr SPRN_IVOR36,r3
li r3,CriticalDoorbell@l
mtspr SPRN_IVOR37,r3
sync
blr

21
arch/powerpc/kernel/traps.c
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@ -53,6 +53,9 @@
#endif
#include <asm/kexec.h>
#include <asm/ppc-opcode.h>
#ifdef CONFIG_FSL_BOOKE
#include <asm/dbell.h>
#endif
#if defined(CONFIG_DEBUGGER) || defined(CONFIG_KEXEC)
int (*__debugger)(struct pt_regs *regs);
@ -1122,6 +1125,24 @@ void vsx_assist_exception(struct pt_regs *regs)
#endif /* CONFIG_VSX */
#ifdef CONFIG_FSL_BOOKE
void doorbell_exception(struct pt_regs *regs)
{
#ifdef CONFIG_SMP
int cpu = smp_processor_id();
int msg;
if (num_online_cpus() < 2)
return;
for (msg = 0; msg < 4; msg++)
if (test_and_clear_bit(msg, &dbell_smp_message[cpu]))
smp_message_recv(msg);
#else
printk(KERN_WARNING "Received doorbell on non-smp system\n");
#endif
}
void CacheLockingException(struct pt_regs *regs, unsigned long address,
unsigned long error_code)
{