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| author | Thomas Gleixner <tglx@linutronix.de> | 2020-08-26 14:16:55 +0300 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2020-09-16 17:52:36 +0300 |
| commit | 7d4d892de6e74194fcfd4ff69f21ba3da97ae282 (patch) | |
| tree | eb32056662c3faba9b0180923b6178ca4997a90c /arch | |
| parent | 2905c50b7d3eabd0fe718247aac86eeff3924ff8 (diff) | |
| download | linux-7d4d892de6e74194fcfd4ff69f21ba3da97ae282.tar.xz | |
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 <tglx@linutronix.de>
Reviewed-by: Juergen Gross <jgross@suse.com>
Link: https://lore.kernel.org/r/20200826112333.326841410@linutronix.de
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/x86/pci/xen.c | 23 |
1 files changed, 18 insertions, 5 deletions
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 |