From b31822277abcd7c83d1c1c0af876da9ccdf3b7d6 Mon Sep 17 00:00:00 2001 From: Jon Derrick Date: Fri, 2 Sep 2016 11:53:05 -0600 Subject: [PATCH] x86/PCI: VMD: Eliminate index member from IRQ list Use math to discover the IRQ list index number relative to the IRQ list head. Signed-off-by: Jon Derrick Signed-off-by: Bjorn Helgaas Acked-by: Keith Busch --- arch/x86/pci/vmd.c | 20 +++++++++++++------- 1 file changed, 13 insertions(+), 7 deletions(-) diff --git a/arch/x86/pci/vmd.c b/arch/x86/pci/vmd.c index 61a97ff36514..e785907acb79 100644 --- a/arch/x86/pci/vmd.c +++ b/arch/x86/pci/vmd.c @@ -56,13 +56,11 @@ struct vmd_irq { /** * struct vmd_irq_list - list of driver requested IRQs mapping to a VMD vector * @irq_list: the list of irq's the VMD one demuxes to. - * @index: index into the VMD MSI-X table; used for message routing. * @count: number of child IRQs assigned to this vector; used to track * sharing. */ struct vmd_irq_list { struct list_head irq_list; - unsigned int index; unsigned int count; }; @@ -91,6 +89,12 @@ static inline struct vmd_dev *vmd_from_bus(struct pci_bus *bus) return container_of(bus->sysdata, struct vmd_dev, sysdata); } +static inline unsigned int index_from_irqs(struct vmd_dev *vmd, + struct vmd_irq_list *irqs) +{ + return irqs - vmd->irqs; +} + /* * Drivers managing a device in a VMD domain allocate their own IRQs as before, * but the MSI entry for the hardware it's driving will be programmed with a @@ -103,9 +107,11 @@ static void vmd_compose_msi_msg(struct irq_data *data, struct msi_msg *msg) { struct vmd_irq *vmdirq = data->chip_data; struct vmd_irq_list *irq = vmdirq->irq; + struct vmd_dev *vmd = irq_data_get_irq_handler_data(data); msg->address_hi = MSI_ADDR_BASE_HI; - msg->address_lo = MSI_ADDR_BASE_LO | MSI_ADDR_DEST_ID(irq->index); + msg->address_lo = MSI_ADDR_BASE_LO | + MSI_ADDR_DEST_ID(index_from_irqs(vmd, irq)); msg->data = 0; } @@ -190,6 +196,7 @@ static int vmd_msi_init(struct irq_domain *domain, struct msi_domain_info *info, struct msi_desc *desc = arg->desc; struct vmd_dev *vmd = vmd_from_bus(msi_desc_to_pci_dev(desc)->bus); struct vmd_irq *vmdirq = kzalloc(sizeof(*vmdirq), GFP_KERNEL); + unsigned int index, vector; if (!vmdirq) return -ENOMEM; @@ -197,10 +204,10 @@ static int vmd_msi_init(struct irq_domain *domain, struct msi_domain_info *info, INIT_LIST_HEAD(&vmdirq->node); vmdirq->irq = vmd_next_irq(vmd, desc); vmdirq->virq = virq; + index = index_from_irqs(vmd, vmdirq->irq); + vector = pci_irq_vector(vmd->dev, index); - irq_domain_set_info(domain, virq, - pci_irq_vector(vmd->dev, vmdirq->irq->index), - info->chip, vmdirq, + irq_domain_set_info(domain, virq, vector, info->chip, vmdirq, handle_untracked_irq, vmd, NULL); return 0; } @@ -681,7 +688,6 @@ static int vmd_probe(struct pci_dev *dev, const struct pci_device_id *id) for (i = 0; i < vmd->msix_count; i++) { INIT_LIST_HEAD(&vmd->irqs[i].irq_list); - vmd->irqs[i].index = i; err = devm_request_irq(&dev->dev, pci_irq_vector(dev, i), vmd_irq, 0, "vmd", &vmd->irqs[i]); if (err) -- 2.20.1