0707ad30d1
This commit is primarily changes caused by reviewing "sparse" and "checkpatch" output on our sources, so is somewhat noisy, since things like "printk() -> pr_err()" (or whatever) throughout the codebase tend to get tedious to read. Rather than trying to tease apart precisely which things changed due to which type of code review, this commit includes various cleanups in the code: - sparse: Add declarations in headers for globals. - sparse: Fix __user annotations. - sparse: Using gfp_t consistently instead of int. - sparse: removing functions not actually used. - checkpatch: Clean up printk() warnings by using pr_info(), etc.; also avoid partial-line printks except in bootup code. - checkpatch: Use exposed structs rather than typedefs. - checkpatch: Change some C99 comments to C89 comments. In addition, a couple of minor other changes are rolled in to this commit: - Add support for a "raise" instruction to cause SIGFPE, etc., to be raised. - Remove some compat code that is unnecessary when we fully eliminate some of the deprecated syscalls from the generic syscall ABI. - Update the tile_defconfig to reflect current config contents. Signed-off-by: Chris Metcalf <cmetcalf@tilera.com> Acked-by: Arnd Bergmann <arnd@arndb.de>
116 lines
3.1 KiB
C
116 lines
3.1 KiB
C
/*
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* Copyright 2010 Tilera Corporation. All Rights Reserved.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation, version 2.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
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* NON INFRINGEMENT. See the GNU General Public License for
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* more details.
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*/
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#include <linux/percpu.h>
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#include <linux/smp.h>
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#include <linux/hardirq.h>
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#include <linux/ptrace.h>
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#include <asm/hv_driver.h>
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#include <asm/irq_regs.h>
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#include <asm/traps.h>
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#include <hv/hypervisor.h>
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#include <arch/interrupts.h>
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/* All messages are stored here */
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static DEFINE_PER_CPU(HV_MsgState, msg_state);
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void __cpuinit init_messaging(void)
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{
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/* Allocate storage for messages in kernel space */
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HV_MsgState *state = &__get_cpu_var(msg_state);
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int rc = hv_register_message_state(state);
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if (rc != HV_OK)
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panic("hv_register_message_state: error %d", rc);
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/* Make sure downcall interrupts will be enabled. */
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raw_local_irq_unmask(INT_INTCTRL_1);
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}
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void hv_message_intr(struct pt_regs *regs, int intnum)
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{
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/*
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* We enter with interrupts disabled and leave them disabled,
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* to match expectations of called functions (e.g.
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* do_ccupdate_local() in mm/slab.c). This is also consistent
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* with normal call entry for device interrupts.
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*/
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int message[HV_MAX_MESSAGE_SIZE/sizeof(int)];
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HV_RcvMsgInfo rmi;
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int nmsgs = 0;
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/* Track time spent here in an interrupt context */
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struct pt_regs *old_regs = set_irq_regs(regs);
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irq_enter();
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#ifdef CONFIG_DEBUG_STACKOVERFLOW
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/* Debugging check for stack overflow: less than 1/8th stack free? */
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{
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long sp = stack_pointer - (long) current_thread_info();
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if (unlikely(sp < (sizeof(struct thread_info) + STACK_WARN))) {
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pr_emerg("hv_message_intr: "
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"stack overflow: %ld\n",
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sp - sizeof(struct thread_info));
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dump_stack();
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}
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}
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#endif
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while (1) {
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rmi = hv_receive_message(__get_cpu_var(msg_state),
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(HV_VirtAddr) message,
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sizeof(message));
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if (rmi.msglen == 0)
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break;
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if (rmi.msglen < 0)
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panic("hv_receive_message failed: %d", rmi.msglen);
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++nmsgs;
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if (rmi.source == HV_MSG_TILE) {
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int tag;
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/* we just send tags for now */
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BUG_ON(rmi.msglen != sizeof(int));
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tag = message[0];
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#ifdef CONFIG_SMP
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evaluate_message(message[0]);
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#else
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panic("Received IPI message %d in UP mode", tag);
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#endif
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} else if (rmi.source == HV_MSG_INTR) {
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HV_IntrMsg *him = (HV_IntrMsg *)message;
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struct hv_driver_cb *cb =
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(struct hv_driver_cb *)him->intarg;
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cb->callback(cb, him->intdata);
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__get_cpu_var(irq_stat).irq_hv_msg_count++;
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}
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}
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/*
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* We shouldn't have gotten a message downcall with no
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* messages available.
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*/
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if (nmsgs == 0)
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panic("Message downcall invoked with no messages!");
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/*
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* Track time spent against the current process again and
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* process any softirqs if they are waiting.
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*/
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irq_exit();
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set_irq_regs(old_regs);
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}
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