[PATCH v2 09/22] x86/xen/MSI: Use MSI chip framework to configure MSI/MSI-X irq
From: Yijing Wang <hidden>
Date: 2014-09-25 02:57:26
Also in:
linux-arch, linux-iommu, linux-mips, linux-pci, linux-s390, linuxppc-dev, lkml, sparclinux
Subsystem:
pci subsystem, the rest, x86 architecture (32-bit and 64-bit), xen pci subsystem · Maintainers:
Bjorn Helgaas, Linus Torvalds, Thomas Gleixner, Ingo Molnar, Borislav Petkov, Dave Hansen, Juergen Gross
Use MSI chip framework instead of arch MSI functions to configure MSI/MSI-X irq. So we can manage MSI/MSI-X irq in a unified framework. Tested-by: Konrad Rzeszutek Wilk <redacted> Signed-off-by: Yijing Wang <redacted> Acked-by: David Vrabel <redacted> Reviewed-by: Konrad Rzeszutek Wilk <redacted> CC: Konrad Rzeszutek Wilk <redacted> --- arch/x86/pci/xen.c | 46 ++++++++++++++++++++++++++++++---------------- 1 files changed, 30 insertions(+), 16 deletions(-)
diff --git a/arch/x86/pci/xen.c b/arch/x86/pci/xen.c
index 84c2fce..e669ee4 100644
--- a/arch/x86/pci/xen.c
+++ b/arch/x86/pci/xen.c@@ -376,6 +376,11 @@ static void xen_initdom_restore_msi_irqs(struct pci_dev *dev) } #endif +static void xen_teardown_msi_irq(unsigned int irq) +{ + xen_destroy_irq(irq); +} + static void xen_teardown_msi_irqs(struct pci_dev *dev) { struct msi_desc *msidesc;
@@ -385,19 +390,26 @@ static void xen_teardown_msi_irqs(struct pci_dev *dev) xen_pci_frontend_disable_msix(dev); else xen_pci_frontend_disable_msi(dev); - - /* Free the IRQ's and the msidesc using the generic code. */ - default_teardown_msi_irqs(dev); -} - -static void xen_teardown_msi_irq(unsigned int irq) -{ - xen_destroy_irq(irq); + + list_for_each_entry(msidesc, &dev->msi_list, list) { + int i, nvec; + if (msidesc->irq == 0) + continue; + if (msidesc->nvec_used) + nvec = msidesc->nvec_used; + else + nvec = 1 << msidesc->msi_attrib.multiple; + for (i = 0; i < nvec; i++) + xen_teardown_msi_irq(msidesc->irq + i); + } } void xen_nop_msi_mask(struct irq_data *data) { } + +struct msi_chip xen_msi_chip; + #endif int __init pci_xen_init(void)
@@ -418,9 +430,9 @@ int __init pci_xen_init(void) #endif #ifdef CONFIG_PCI_MSI - x86_msi.setup_msi_irqs = xen_setup_msi_irqs; - x86_msi.teardown_msi_irq = xen_teardown_msi_irq; - x86_msi.teardown_msi_irqs = xen_teardown_msi_irqs; + xen_msi_chip.setup_irqs = xen_setup_msi_irqs; + xen_msi_chip.teardown_irqs = xen_teardown_msi_irqs; + x86_msi_chip = &xen_msi_chip; msi_chip.irq_mask = xen_nop_msi_mask; msi_chip.irq_unmask = xen_nop_msi_mask; #endif
@@ -441,8 +453,9 @@ int __init pci_xen_hvm_init(void) #endif #ifdef CONFIG_PCI_MSI - x86_msi.setup_msi_irqs = xen_hvm_setup_msi_irqs; - x86_msi.teardown_msi_irq = xen_teardown_msi_irq; + xen_msi_chip.setup_irqs = xen_hvm_setup_msi_irqs; + xen_msi_chip.teardown_irq = xen_teardown_msi_irq; + x86_msi_chip = &xen_msi_chip; #endif return 0; }
@@ -499,9 +512,10 @@ int __init pci_xen_initial_domain(void) int irq; #ifdef CONFIG_PCI_MSI - x86_msi.setup_msi_irqs = xen_initdom_setup_msi_irqs; - x86_msi.teardown_msi_irq = xen_teardown_msi_irq; - x86_msi.restore_msi_irqs = xen_initdom_restore_msi_irqs; + xen_msi_chip.setup_irqs = xen_initdom_setup_msi_irqs; + xen_msi_chip.teardown_irq = xen_teardown_msi_irq; + xen_msi_chip.restore_irqs = xen_initdom_restore_msi_irqs; + x86_msi_chip = &xen_msi_chip; msi_chip.irq_mask = xen_nop_msi_mask; msi_chip.irq_unmask = xen_nop_msi_mask; #endif
--
1.7.1