2 * Copyright 2010 Tilera Corporation. All Rights Reserved.
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation, version 2.
8 * This program is distributed in the hope that it will be useful, but
9 * WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
11 * NON INFRINGEMENT. See the GNU General Public License for
15 #include <linux/percpu.h>
16 #include <linux/smp.h>
17 #include <linux/hardirq.h>
18 #include <linux/ptrace.h>
19 #include <asm/hv_driver.h>
20 #include <asm/irq_regs.h>
21 #include <hv/hypervisor.h>
22 #include <arch/interrupts.h>
24 /* All messages are stored here */
25 static DEFINE_PER_CPU(HV_MsgState
, msg_state
);
27 void __cpuinit
init_messaging()
29 /* Allocate storage for messages in kernel space */
30 HV_MsgState
*state
= &__get_cpu_var(msg_state
);
31 int rc
= hv_register_message_state(state
);
33 panic("hv_register_message_state: error %d", rc
);
35 /* Make sure downcall interrupts will be enabled. */
36 raw_local_irq_unmask(INT_INTCTRL_1
);
39 void hv_message_intr(struct pt_regs
*regs
, int intnum
)
42 * We enter with interrupts disabled and leave them disabled,
43 * to match expectations of called functions (e.g.
44 * do_ccupdate_local() in mm/slab.c). This is also consistent
45 * with normal call entry for device interrupts.
48 int message
[HV_MAX_MESSAGE_SIZE
/sizeof(int)];
52 /* Track time spent here in an interrupt context */
53 struct pt_regs
*old_regs
= set_irq_regs(regs
);
56 #ifdef CONFIG_DEBUG_STACKOVERFLOW
57 /* Debugging check for stack overflow: less than 1/8th stack free? */
59 long sp
= stack_pointer
- (long) current_thread_info();
60 if (unlikely(sp
< (sizeof(struct thread_info
) + STACK_WARN
))) {
61 printk(KERN_EMERG
"hv_message_intr: "
62 "stack overflow: %ld\n",
63 sp
- sizeof(struct thread_info
));
70 rmi
= hv_receive_message(__get_cpu_var(msg_state
),
71 (HV_VirtAddr
) message
,
77 panic("hv_receive_message failed: %d", rmi
.msglen
);
81 if (rmi
.source
== HV_MSG_TILE
) {
84 /* we just send tags for now */
85 BUG_ON(rmi
.msglen
!= sizeof(int));
89 evaluate_message(message
[0]);
91 panic("Received IPI message %d in UP mode", tag
);
93 } else if (rmi
.source
== HV_MSG_INTR
) {
94 HV_IntrMsg
*him
= (HV_IntrMsg
*)message
;
95 struct hv_driver_cb
*cb
=
96 (struct hv_driver_cb
*)him
->intarg
;
97 cb
->callback(cb
, him
->intdata
);
98 __get_cpu_var(irq_stat
).irq_hv_msg_count
++;
103 * We shouldn't have gotten a message downcall with no
104 * messages available.
107 panic("Message downcall invoked with no messages!");
110 * Track time spent against the current process again and
111 * process any softirqs if they are waiting.
114 set_irq_regs(old_regs
);
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