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Commit 78316ada authored by Konrad Rzeszutek Wilk's avatar Konrad Rzeszutek Wilk
Browse files

xen/pci: Remove 'xen_allocate_pirq_gsi'. 



In the past (2.6.38) the 'xen_allocate_pirq_gsi' would allocate
an entry in a Linux IRQ -> {XEN_IRQ, type, event, ..} array. All
of that has been removed in 2.6.39 and the Xen IRQ subsystem uses
an linked list that is populated when the call to
'xen_allocate_irq_gsi' (universally done from any of the xen_bind_*
calls) is done. The 'xen_allocate_pirq_gsi' is a NOP and there is
no need for it anymore so lets remove it.

Signed-off-by: default avatarKonrad Rzeszutek Wilk <konrad.wilk@oracle.com>
parent 34b1d126

arch/x86/pci/xen.c

+12 −25
Original line number Diff line number Diff line
@@ -37,14 +37,8 @@ static int xen_pcifront_enable_irq(struct pci_dev *dev) 
			 rc);

		return rc;

	}



	rc = xen_allocate_pirq_gsi(gsi);

	if (rc < 0) {

		dev_warn(&dev->dev, "Xen PCI: failed to allocate a PIRQ for GSI%d: %d\n",

			 gsi, rc);

		return rc;

	}

	pirq = rc;

	/* In PV DomU the Xen PCI backend puts the PIRQ in the interrupt line.*/

	pirq = gsi;



	if (gsi < NR_IRQS_LEGACY)

		share = 0;
@@ -63,18 +57,16 @@ static int xen_pcifront_enable_irq(struct pci_dev *dev) 


#ifdef CONFIG_ACPI

static int xen_register_pirq(u32 gsi, int gsi_override, int triggering,

			     bool alloc_pirq)

			     bool set_pirq)

{

	int rc, pirq = -1, irq = -1;

	struct physdev_map_pirq map_irq;

	int shareable = 0;

	char *name;



	if (alloc_pirq) {

		pirq = xen_allocate_pirq_gsi(gsi);

		if (pirq < 0)

			goto out;

	}

	if (set_pirq)

		pirq = gsi;



	map_irq.domid = DOMID_SELF;

	map_irq.type = MAP_PIRQ_TYPE_GSI;

	map_irq.index = gsi;
@@ -112,8 +104,8 @@ static int acpi_register_gsi_xen_hvm(struct device *dev, u32 gsi, 
	if (!xen_hvm_domain())

		return -1;



	return xen_register_pirq(gsi, -1 /* no GSI override */,

				 trigger, false /* no PIRQ allocation */);

	return xen_register_pirq(gsi, -1 /* no GSI override */, trigger,

				 false /* no mapping of GSI to PIRQ */);

}



#ifdef CONFIG_XEN_DOM0
@@ -430,7 +422,7 @@ static __init void xen_setup_acpi_sci(void) 


int __init pci_xen_initial_domain(void)

{

	int pirq, irq;

	int irq;



#ifdef CONFIG_PCI_MSI

	x86_msi.setup_msi_irqs = xen_initdom_setup_msi_irqs;
@@ -447,16 +439,11 @@ int __init pci_xen_initial_domain(void) 


		xen_register_pirq(irq, -1 /* no GSI override */,

			trigger ? ACPI_LEVEL_SENSITIVE : ACPI_EDGE_SENSITIVE,

			true /* allocate IRQ */);

			true /* Map GSI to PIRQ */);

	}

	if (0 == nr_ioapics) {

		for (irq = 0; irq < NR_IRQS_LEGACY; irq++) {

			pirq = xen_allocate_pirq_gsi(irq);

			if (WARN(pirq < 0,

				 "Could not allocate PIRQ for legacy interrupt\n"))

				break;

			irq = xen_bind_pirq_gsi_to_irq(irq, pirq, 0, "xt-pic");

		}

		for (irq = 0; irq < NR_IRQS_LEGACY; irq++)

			xen_bind_pirq_gsi_to_irq(irq, irq, 0, "xt-pic");

	}

	return 0;

}

drivers/xen/events.c

+0 −5
Original line number Diff line number Diff line
@@ -615,11 +615,6 @@ static int find_irq_by_gsi(unsigned gsi) 
	return -1;

}



int xen_allocate_pirq_gsi(unsigned gsi)

{

	return gsi;

}



/*

 * Do not make any assumptions regarding the relationship between the

 * IRQ number returned here and the Xen pirq argument.

include/xen/events.h

+0 −2
Original line number Diff line number Diff line
@@ -74,8 +74,6 @@ int xen_set_callback_via(uint64_t via); 
void xen_evtchn_do_upcall(struct pt_regs *regs);

void xen_hvm_evtchn_do_upcall(void);



/* Allocate a pirq for a physical interrupt, given a gsi. */

int xen_allocate_pirq_gsi(unsigned gsi);

/* Bind a pirq for a physical interrupt to an irq. */

int xen_bind_pirq_gsi_to_irq(unsigned gsi,

			     unsigned pirq, int shareable, char *name);