From 98043704f375f63a47efeff123ab92fcf34b95e6 Mon Sep 17 00:00:00 2001 From: "Ahmed S. Darwish" Date: Fri, 25 Nov 2022 00:24:25 +0100 Subject: genirq/msi: Make msi_get_virq() device domain aware In preparation of the upcoming per device multi MSI domain support, change the interface to support lookups based on domain id and zero based index within the domain. Signed-off-by: Ahmed S. Darwish Signed-off-by: Thomas Gleixner Reviewed-by: Kevin Tian Acked-by: Marc Zyngier Link: https://lore.kernel.org/r/20221124230314.044613697@linutronix.de --- kernel/irq/msi.c | 19 +++++++++++++------ 1 file changed, 13 insertions(+), 6 deletions(-) (limited to 'kernel/irq') diff --git a/kernel/irq/msi.c b/kernel/irq/msi.c index ec08d1f22be0..e1593c16518b 100644 --- a/kernel/irq/msi.c +++ b/kernel/irq/msi.c @@ -337,26 +337,32 @@ struct msi_desc *msi_next_desc(struct device *dev, unsigned int domid, EXPORT_SYMBOL_GPL(msi_next_desc); /** - * msi_get_virq - Return Linux interrupt number of a MSI interrupt + * msi_domain_get_virq - Lookup the Linux interrupt number for a MSI index on a interrupt domain * @dev: Device to operate on + * @domid: Domain ID of the interrupt domain associated to the device * @index: MSI interrupt index to look for (0-based) * * Return: The Linux interrupt number on success (> 0), 0 if not found */ -unsigned int msi_get_virq(struct device *dev, unsigned int index) +unsigned int msi_domain_get_virq(struct device *dev, unsigned int domid, unsigned int index) { struct msi_desc *desc; unsigned int ret = 0; + bool pcimsi = false; struct xarray *xa; - bool pcimsi; if (!dev->msi.data) return 0; - pcimsi = dev_is_pci(dev) ? to_pci_dev(dev)->msi_enabled : false; + if (WARN_ON_ONCE(index > MSI_MAX_INDEX || domid >= MSI_MAX_DEVICE_IRQDOMAINS)) + return 0; + + /* This check is only valid for the PCI default MSI domain */ + if (dev_is_pci(dev) && domid == MSI_DEFAULT_DOMAIN) + pcimsi = to_pci_dev(dev)->msi_enabled; msi_lock_descs(dev); - xa = &dev->msi.data->__domains[MSI_DEFAULT_DOMAIN].store; + xa = &dev->msi.data->__domains[domid].store; desc = xa_load(xa, pcimsi ? 0 : index); if (desc && desc->irq) { /* @@ -371,10 +377,11 @@ unsigned int msi_get_virq(struct device *dev, unsigned int index) ret = desc->irq; } } + msi_unlock_descs(dev); return ret; } -EXPORT_SYMBOL_GPL(msi_get_virq); +EXPORT_SYMBOL_GPL(msi_domain_get_virq); #ifdef CONFIG_SYSFS static struct attribute *msi_dev_attrs[] = { -- cgit v1.2.3