Merge branch 'stable/bug.fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/konrad/xen (075d9db1) · Commits · e / devices / android_kernel_samsung_universal8890

arch/x86/pci/xen.c

+28 −28

Original line number	Diff line number	Diff line
		@@ -327,13 +327,12 @@ int __init pci_xen_hvm_init(void)
		}

		#ifdef CONFIG_XEN_DOM0
		static int xen_register_pirq(u32 gsi, int triggering)
		static int xen_register_pirq(u32 gsi, int gsi_override, int triggering)
		{
		int rc, pirq, irq = -1;
		struct physdev_map_pirq map_irq;
		int shareable = 0;
		char *name;
		bool gsi_override = false;

		if (!xen_pv_domain())
		return -1;
		@@ -345,31 +344,12 @@ static int xen_register_pirq(u32 gsi, int triggering)
		shareable = 1;
		name = "ioapic-level";
		}

		pirq = xen_allocate_pirq_gsi(gsi);
		if (pirq < 0)
		goto out;

		/* Before we bind the GSI to a Linux IRQ, check whether
		* we need to override it with bus_irq (IRQ) value. Usually for
		* IRQs below IRQ_LEGACY_IRQ this holds IRQ == GSI, as so:
		* ACPI: INT_SRC_OVR (bus 0 bus_irq 9 global_irq 9 low level)
		* but there are oddballs where the IRQ != GSI:
		* ACPI: INT_SRC_OVR (bus 0 bus_irq 9 global_irq 20 low level)
		* which ends up being: gsi_to_irq[9] == 20
		* (which is what acpi_gsi_to_irq ends up calling when starting the
		* the ACPI interpreter and keels over since IRQ 9 has not been
		* setup as we had setup IRQ 20 for it).
		*/
		if (gsi == acpi_sci_override_gsi) {
		/* Check whether the GSI != IRQ */
		acpi_gsi_to_irq(gsi, &irq);
		if (irq != gsi)
		/* Bugger, we MUST have that IRQ. */
		gsi_override = true;
		}
		if (gsi_override)
		irq = xen_bind_pirq_gsi_to_irq(irq, pirq, shareable, name);
		if (gsi_override >= 0)
		irq = xen_bind_pirq_gsi_to_irq(gsi_override, pirq, shareable, name);
		else
		irq = xen_bind_pirq_gsi_to_irq(gsi, pirq, shareable, name);
		if (irq < 0)
		@@ -392,7 +372,7 @@ out:
		return irq;
		}

		static int xen_register_gsi(u32 gsi, int triggering, int polarity)
		static int xen_register_gsi(u32 gsi, int gsi_override, int triggering, int polarity)
		{
		int rc, irq;
		struct physdev_setup_gsi setup_gsi;
		@@ -403,7 +383,7 @@ static int xen_register_gsi(u32 gsi, int triggering, int polarity)
		printk(KERN_DEBUG "xen: registering gsi %u triggering %d polarity %d\n",
		gsi, triggering, polarity);

		irq = xen_register_pirq(gsi, triggering);
		irq = xen_register_pirq(gsi, gsi_override, triggering);

		setup_gsi.gsi = gsi;
		setup_gsi.triggering = (triggering == ACPI_EDGE_SENSITIVE ? 0 : 1);
		@@ -425,6 +405,8 @@ static __init void xen_setup_acpi_sci(void)
		int rc;
		int trigger, polarity;
		int gsi = acpi_sci_override_gsi;
		int irq = -1;
		int gsi_override = -1;

		if (!gsi)
		return;
		@@ -441,7 +423,25 @@ static __init void xen_setup_acpi_sci(void)
		printk(KERN_INFO "xen: sci override: global_irq=%d trigger=%d "
		"polarity=%d\n", gsi, trigger, polarity);

		gsi = xen_register_gsi(gsi, trigger, polarity);
		/* Before we bind the GSI to a Linux IRQ, check whether
		* we need to override it with bus_irq (IRQ) value. Usually for
		* IRQs below IRQ_LEGACY_IRQ this holds IRQ == GSI, as so:
		* ACPI: INT_SRC_OVR (bus 0 bus_irq 9 global_irq 9 low level)
		* but there are oddballs where the IRQ != GSI:
		* ACPI: INT_SRC_OVR (bus 0 bus_irq 9 global_irq 20 low level)
		* which ends up being: gsi_to_irq[9] == 20
		* (which is what acpi_gsi_to_irq ends up calling when starting the
		* the ACPI interpreter and keels over since IRQ 9 has not been
		* setup as we had setup IRQ 20 for it).
		*/
		/* Check whether the GSI != IRQ */
		if (acpi_gsi_to_irq(gsi, &irq) == 0) {
		if (irq >= 0 && irq != gsi)
		/* Bugger, we MUST have that IRQ. */
		gsi_override = irq;
		}

		gsi = xen_register_gsi(gsi, gsi_override, trigger, polarity);
		printk(KERN_INFO "xen: acpi sci %d\n", gsi);

		return;
		@@ -450,7 +450,7 @@ static __init void xen_setup_acpi_sci(void)
		static int acpi_register_gsi_xen(struct device *dev, u32 gsi,
		int trigger, int polarity)
		{
		return xen_register_gsi(gsi, trigger, polarity);
		return xen_register_gsi(gsi, -1 /* no GSI override */, trigger, polarity);
		}

		static int __init pci_xen_initial_domain(void)
		@@ -489,7 +489,7 @@ void __init xen_setup_pirqs(void)
		if (acpi_get_override_irq(irq, &trigger, &polarity) == -1)
		continue;

		xen_register_pirq(irq,
		xen_register_pirq(irq, -1 /* no GSI override */,
		trigger ? ACPI_LEVEL_SENSITIVE : ACPI_EDGE_SENSITIVE);
		}
		}