Differential D17977 Diff 50456 head/sys/x86/xen/xen_msi.c

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head/sys/x86/xen/xen_msi.c

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	*/			*/

	#include <sys/cdefs.h>			#include <sys/cdefs.h>
	__FBSDID("$FreeBSD$");			__FBSDID("$FreeBSD$");

	#include <sys/param.h>			#include <sys/param.h>
	#include <sys/bus.h>			#include <sys/bus.h>
	#include <sys/kernel.h>			#include <sys/kernel.h>
				#include <sys/limits.h>
	#include <sys/lock.h>			#include <sys/lock.h>
	#include <sys/malloc.h>			#include <sys/malloc.h>
	#include <sys/mutex.h>			#include <sys/mutex.h>
	#include <sys/sx.h>			#include <sys/sx.h>
	#include <sys/systm.h>			#include <sys/systm.h>
	#include <x86/apicreg.h>			#include <x86/apicreg.h>
	#include <machine/cputypes.h>			#include <machine/cputypes.h>
	#include <machine/md_var.h>			#include <machine/md_var.h>
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	static u_int msi_last_irq;			static u_int msi_last_irq;

	void			void
	xen_msi_init(void)			xen_msi_init(void)
	{			{

	MPASS(num_io_irqs > 0);			MPASS(num_io_irqs > 0);
	first_msi_irq = min(MINIMUM_MSI_INT, num_io_irqs);			first_msi_irq = min(MINIMUM_MSI_INT, num_io_irqs);
	num_io_irqs = first_msi_irq + NUM_MSI_INTS;			if (num_msi_irqs > UINT_MAX - first_msi_irq)
				panic("num_msi_irq too high");
				num_io_irqs = first_msi_irq + num_msi_irqs;

	mtx_init(&msi_lock, "msi", NULL, MTX_DEF);			mtx_init(&msi_lock, "msi", NULL, MTX_DEF);
	}			}

	/*			/*
	* Try to allocate 'count' interrupt sources with contiguous IDT values.			* Try to allocate 'count' interrupt sources with contiguous IDT values.
	*/			*/
	int			int
	xen_msi_alloc(device_t dev, int count, int maxcount, int *irqs)			xen_msi_alloc(device_t dev, int count, int maxcount, int *irqs)
	{			{
	int i, ret = 0;			int i, ret = 0;

	mtx_lock(&msi_lock);			mtx_lock(&msi_lock);

	/* If we would exceed the max, give up. */			/* If we would exceed the max, give up. */
	if ((msi_last_irq + count) > NUM_MSI_INTS) {			if (msi_last_irq + count > num_msi_irqs) {
	mtx_unlock(&msi_lock);			mtx_unlock(&msi_lock);
	return (ENXIO);			return (ENXIO);
	}			}

	/* Allocate MSI vectors */			/* Allocate MSI vectors */
	for (i = 0; i < count; i++)			for (i = 0; i < count; i++)
	irqs[i] = first_msi_irq + msi_last_irq++;			irqs[i] = first_msi_irq + msi_last_irq++;

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