116 lines
3.1 KiB
C
116 lines
3.1 KiB
C
|
/*
|
||
|
|
* Copyright 2010 Tilera Corporation. All Rights Reserved.
|
||
|
|
*
|
||
|
|
* 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, version 2.
|
||
|
|
*
|
||
|
|
* This program is distributed in the hope that it will be useful, but
|
||
|
|
* WITHOUT ANY WARRANTY; without even the implied warranty of
|
||
|
|
* MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
|
||
|
|
* NON INFRINGEMENT. See the GNU General Public License for
|
||
|
|
* more details.
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include <linux/percpu.h>
|
||
|
|
#include <linux/smp.h>
|
||
|
|
#include <linux/hardirq.h>
|
||
|
|
#include <linux/ptrace.h>
|
||
|
|
#include <asm/hv_driver.h>
|
||
|
|
#include <asm/irq_regs.h>
|
||
|
|
#include <hv/hypervisor.h>
|
||
|
|
#include <arch/interrupts.h>
|
||
|
|
|
||
|
|
/* All messages are stored here */
|
||
|
|
static DEFINE_PER_CPU(HV_MsgState, msg_state);
|
||
|
|
|
||
|
|
void __cpuinit init_messaging()
|
||
|
|
{
|
||
|
|
/* Allocate storage for messages in kernel space */
|
||
|
|
HV_MsgState *state = &__get_cpu_var(msg_state);
|
||
|
|
int rc = hv_register_message_state(state);
|
||
|
|
if (rc != HV_OK)
|
||
|
|
panic("hv_register_message_state: error %d", rc);
|
||
|
|
|
||
|
|
/* Make sure downcall interrupts will be enabled. */
|
||
|
|
raw_local_irq_unmask(INT_INTCTRL_1);
|
||
|
|
}
|
||
|
|
|
||
|
|
void hv_message_intr(struct pt_regs *regs, int intnum)
|
||
|
|
{
|
||
|
|
/*
|
||
|
|
* We enter with interrupts disabled and leave them disabled,
|
||
|
|
* to match expectations of called functions (e.g.
|
||
|
|
* do_ccupdate_local() in mm/slab.c). This is also consistent
|
||
|
|
* with normal call entry for device interrupts.
|
||
|
|
*/
|
||
|
|
|
||
|
|
int message[HV_MAX_MESSAGE_SIZE/sizeof(int)];
|
||
|
|
HV_RcvMsgInfo rmi;
|
||
|
|
int nmsgs = 0;
|
||
|
|
|
||
|
|
/* Track time spent here in an interrupt context */
|
||
|
|
struct pt_regs *old_regs = set_irq_regs(regs);
|
||
|
|
irq_enter();
|
||
|
|
|
||
|
|
#ifdef CONFIG_DEBUG_STACKOVERFLOW
|
||
|
|
/* Debugging check for stack overflow: less than 1/8th stack free? */
|
||
|
|
{
|
||
|
|
long sp = stack_pointer - (long) current_thread_info();
|
||
|
|
if (unlikely(sp < (sizeof(struct thread_info) + STACK_WARN))) {
|
||
|
|
printk(KERN_EMERG "hv_message_intr: "
|
||
|
|
"stack overflow: %ld\n",
|
||
|
|
sp - sizeof(struct thread_info));
|
||
|
|
dump_stack();
|
||
|
|
}
|
||
|
|
}
|
||
|
|
#endif
|
||
|
|
|
||
|
|
while (1) {
|
||
|
|
rmi = hv_receive_message(__get_cpu_var(msg_state),
|
||
|
|
(HV_VirtAddr) message,
|
||
|
|
sizeof(message));
|
||
|
|
if (rmi.msglen == 0)
|
||
|
|
break;
|
||
|
|
|
||
|
|
if (rmi.msglen < 0)
|
||
|
|
panic("hv_receive_message failed: %d", rmi.msglen);
|
||
|
|
|
||
|
|
++nmsgs;
|
||
|
|
|
||
|
|
if (rmi.source == HV_MSG_TILE) {
|
||
|
|
int tag;
|
||
|
|
|
||
|
|
/* we just send tags for now */
|
||
|
|
BUG_ON(rmi.msglen != sizeof(int));
|
||
|
|
|
||
|
|
tag = message[0];
|
||
|
|
#ifdef CONFIG_SMP
|
||
|
|
evaluate_message(message[0]);
|
||
|
|
#else
|
||
|
|
panic("Received IPI message %d in UP mode", tag);
|
||
|
|
#endif
|
||
|
|
} else if (rmi.source == HV_MSG_INTR) {
|
||
|
|
HV_IntrMsg *him = (HV_IntrMsg *)message;
|
||
|
|
struct hv_driver_cb *cb =
|
||
|
|
(struct hv_driver_cb *)him->intarg;
|
||
|
|
cb->callback(cb, him->intdata);
|
||
|
|
__get_cpu_var(irq_stat).irq_hv_msg_count++;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
* We shouldn't have gotten a message downcall with no
|
||
|
|
* messages available.
|
||
|
|
*/
|
||
|
|
if (nmsgs == 0)
|
||
|
|
panic("Message downcall invoked with no messages!");
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Track time spent against the current process again and
|
||
|
|
* process any softirqs if they are waiting.
|
||
|
|
*/
|
||
|
|
irq_exit();
|
||
|
|
set_irq_regs(old_regs);
|
||
|
|
}
|