From 7d4d892de6e74194fcfd4ff69f21ba3da97ae282 Mon Sep 17 00:00:00 2001 From: Thomas Gleixner Date: Wed, 26 Aug 2020 13:16:55 +0200 Subject: x86/xen: Rework MSI teardown X86 cannot store the irq domain pointer in struct device without breaking XEN because the irq domain pointer takes precedence over arch_*_msi_irqs() fallbacks. XENs MSI teardown relies on default_teardown_msi_irqs() which invokes arch_teardown_msi_irq(). default_teardown_msi_irqs() is a trivial iterator over the msi entries associated to a device. Implement this loop in xen_teardown_msi_irqs() to prepare for removal of the fallbacks for X86. This is a preparatory step to wrap XEN MSI alloc/free into a irq domain which in turn allows to store the irq domain pointer in struct device and to use the irq domain functions directly. Signed-off-by: Thomas Gleixner Reviewed-by: Juergen Gross Link: https://lore.kernel.org/r/20200826112333.326841410@linutronix.de --- arch/x86/pci/xen.c | 23 ++++++++++++++++++----- 1 file changed, 18 insertions(+), 5 deletions(-) (limited to 'arch/x86/pci') diff --git a/arch/x86/pci/xen.c b/arch/x86/pci/xen.c index ba8dc9480b1e..6a2debe74b61 100644 --- a/arch/x86/pci/xen.c +++ b/arch/x86/pci/xen.c @@ -377,20 +377,31 @@ static void xen_initdom_restore_msi_irqs(struct pci_dev *dev) static void xen_teardown_msi_irqs(struct pci_dev *dev) { struct msi_desc *msidesc; + int i; + + for_each_pci_msi_entry(msidesc, dev) { + if (msidesc->irq) { + for (i = 0; i < msidesc->nvec_used; i++) + xen_destroy_irq(msidesc->irq + i); + } + } +} + +static void xen_pv_teardown_msi_irqs(struct pci_dev *dev) +{ + struct msi_desc *msidesc = first_pci_msi_entry(dev); - msidesc = first_pci_msi_entry(dev); if (msidesc->msi_attrib.is_msix) 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); + xen_teardown_msi_irqs(dev); } static void xen_teardown_msi_irq(unsigned int irq) { - xen_destroy_irq(irq); + WARN_ON_ONCE(1); } #endif @@ -413,7 +424,7 @@ int __init pci_xen_init(void) #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; + x86_msi.teardown_msi_irqs = xen_pv_teardown_msi_irqs; pci_msi_ignore_mask = 1; #endif return 0; @@ -437,6 +448,7 @@ static void __init xen_hvm_msi_init(void) } x86_msi.setup_msi_irqs = xen_hvm_setup_msi_irqs; + x86_msi.teardown_msi_irqs = xen_teardown_msi_irqs; x86_msi.teardown_msi_irq = xen_teardown_msi_irq; } #endif @@ -473,6 +485,7 @@ int __init pci_xen_initial_domain(void) #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.teardown_msi_irqs = xen_teardown_pv_msi_irqs; x86_msi.restore_msi_irqs = xen_initdom_restore_msi_irqs; pci_msi_ignore_mask = 1; #endif -- cgit