xmpcilpevent.c

来自「是关于linux2.5.1的完全源码」· C语言 代码 · 共 151 行

/*
   * File XmPciLpEvent.h created by Wayne Holm on Mon Jan 15 2001.
   *
   * This module handles PCI interrupt events sent by the AS400 Hypervisor.
*/


#include <linux/pci.h>
#include <linux/config.h>
#include <linux/init.h>
#include <linux/threads.h>
#include <linux/smp.h>
#include <linux/param.h>
#include <linux/string.h>
#include <linux/bootmem.h>
#include <linux/blk.h>
#include <linux/ide.h>

#include <asm/iSeries/HvTypes.h>
#include <asm/iSeries/HvLpEvent.h>
#include <asm/iSeries/HvCallPci.h>
#include <asm/iSeries/XmPciLpEvent.h>


enum XmPciLpEvent_Subtype {
    XmPciLpEvent_BusCreated	= 0,		// PHB has been created
    XmPciLpEvent_BusFailed	= 1,		// PHB has failed
    XmPciLpEvent_BusRecovered	= 12,		// PHB has been recovered
    XmPciLpEvent_NodeFailed	= 4,		// Multi-adapter bridge has failed
    XmPciLpEvent_NodeRecovered	= 5,		// Multi-adapter bridge has recovered
    XmPciLpEvent_SlotInterrupt	= 22		// Slot interrupt
};

struct XmPciLpEvent_BusInterrupt {
    HvBusNumber		busNumber;
    HvSubBusNumber	subBusNumber;
};

struct XmPciLpEvent_NodeInterrupt {
    HvBusNumber		busNumber;
    HvSubBusNumber	subBusNumber;
    HvAgentId		deviceId;
};

struct XmPciLpEvent {
    struct HvLpEvent hvLpEvent;

    union {
	u64 alignData;			// Align on an 8-byte boundary

	struct {
	    u32			fisr;
	    HvBusNumber		busNumber;
	    HvSubBusNumber	subBusNumber;
	    HvAgentId		deviceId;
	} slotInterrupt;

	struct XmPciLpEvent_BusInterrupt busFailed;
	struct XmPciLpEvent_BusInterrupt busRecovered;
	struct XmPciLpEvent_BusInterrupt busCreated;

	struct XmPciLpEvent_NodeInterrupt nodeFailed;
	struct XmPciLpEvent_NodeInterrupt nodeRecovered;

    } eventData;

};

static void intReceived(struct XmPciLpEvent* eventParm, struct pt_regs* regsParm);

static void XmPciLpEvent_handler( struct HvLpEvent* eventParm, struct pt_regs* regsParm) {
    if (eventParm && eventParm->xType == HvLpEvent_Type_PciIo) {
	switch( eventParm->xFlags.xFunction ) {
	    case HvLpEvent_Function_Int:
		intReceived( (struct XmPciLpEvent*)eventParm, regsParm );
		break;
	    case HvLpEvent_Function_Ack:
		printk(KERN_ERR "XmPciLpEvent.c: unexpected ack received\n");
		break;
	    default:
		printk(KERN_ERR "XmPciLpEvent.c: unexpected event function %d\n",
		       (int)eventParm->xFlags.xFunction);
		break;
	};
    }
    else {
	if (event) {
	    printk(KERN_ERR "XmPciLpEvent.c: unrecognized event type 0x%x\n",
		   (int)eventParm->xType);
	}
	else {
	    printk(KERN_ERR "XmPciLpEvent.c: NULL event received\n");
	}
    }
}

static void intReceived(struct XmPciLpEvent* eventParm, struct pt_regs* regsParm) {
    int irq;

    switch (eventParm->hvLpEvent.xSubtype) {
	case XmPciLpEvent_SlotInterrupt:
	    irq = eventParm->hvLpEvent.xCorrelationToken;
	    /* Dispatch the interrupt handlers for this irq */
	    ppc_irq_dispatch_handler(regsParm, irq);
	    HvCallPci_eoi(eventParm->eventData.slotInterrupt.busNumber,
			  eventParm->eventData.slotInterrupt.subBusNumber,
			  eventParm->eventData.slotInterrupt.deviceId);
	    break;
	/* Ignore error recovery events for now */
	case XmPciLpEvent_BusCreated:
	    printk(KERN_INFO "XmPciLpEvent.c: system bus %d created\n", eventParm->eventData.busCreated.busNumber);
	    break;
	case XmPciLpEvent_BusFailed:
	    printk(KERN_INFO "XmPciLpEvent.c: system bus %d failed\n", eventParm->eventData.busFailed.busNumber);
	    break;
	case XmPciLpEvent_BusRecovered:
	    printk(KERN_INFO "XmPciLpEvent.c: system bus %d recovered\n", eventParm->eventData.busRecovered.busNumber);
	    break;
	case XmPciLpEvent_NodeFailed:
	    printk(KERN_INFO "XmPciLpEvent.c: multi-adapter bridge %d/%d/%d failed\n", eventParm->eventData.nodeFailed.busNumber, eventParm->eventData.nodeFailed.subBusNumber, eventParm->eventData.nodeFailed.deviceId);
	    break;
	case XmPciLpEvent_NodeRecovered:
	    printk(KERN_INFO "XmPciLpEvent.c: multi-adapter bridge %d/%d/%d recovered\n", eventParm->eventData.nodeRecovered.busNumber, eventParm->eventData.nodeRecovered.subBusNumber, eventParm->eventData.nodeRecovered.deviceId);
	    break;
	default:
	    printk(KERN_ERR "XmPciLpEvent.c: unrecognized event subtype 0x%x\n",
		   eventParm->hvLpEvent.xSubtype);
	    break;
    };
}


/* This should be called sometime prior to buswalk (init_IRQ would be good) */
int XmPciLpEvent_init() {
    int xRc;

    xRc = HvLpEvent_registerHandler(HvLpEvent_Type_PciIo, &XmPciLpEvent_handler);
    if (xRc == 0) {
	xRc = HvLpEvent_openPath(HvLpEvent_Type_PciIo, 0);
	if (xRc != 0) {
	    printk(KERN_ERR "XmPciLpEvent.c: open event path failed with rc 0x%x\n", xRc);
	}
    }
    else {
	printk(KERN_ERR "XmPciLpEvent.c: register handler failed with rc 0x%x\n", xRc);
    }

    return xRc;
}