From: Logan Gunthorpe Date: Thu, 23 May 2019 22:30:52 +0000 (-0600) Subject: PCI/switchtec: Add module parameter to request more interrupts X-Git-Tag: v5.3-rc1~6^2~8 X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=fcdf8e95fa3b97097bd4e200f0ee04df85b04d99;p=thirdparty%2Fkernel%2Flinux.git PCI/switchtec: Add module parameter to request more interrupts Seeing the we want to use more interrupts in the NTB MSI code we need to be able allocate more (sometimes virtual) interrupts in the switchtec driver. Therefore add a module parameter to request to allocate additional interrupts. This puts virtually no limit on the number of MSI interrupts available to NTB clients. Signed-off-by: Logan Gunthorpe Cc: Bjorn Helgaas Signed-off-by: Jon Mason --- diff --git a/drivers/pci/switch/switchtec.c b/drivers/pci/switch/switchtec.c index bebbde4ebec08..8c94cd3fd1f21 100644 --- a/drivers/pci/switch/switchtec.c +++ b/drivers/pci/switch/switchtec.c @@ -30,6 +30,10 @@ module_param(use_dma_mrpc, bool, 0644); MODULE_PARM_DESC(use_dma_mrpc, "Enable the use of the DMA MRPC feature"); +static int nirqs = 32; +module_param(nirqs, int, 0644); +MODULE_PARM_DESC(nirqs, "number of interrupts to allocate (more may be useful for NTB applications)"); + static dev_t switchtec_devt; static DEFINE_IDA(switchtec_minor_ida); @@ -1263,8 +1267,12 @@ static int switchtec_init_isr(struct switchtec_dev *stdev) int dma_mrpc_irq; int rc; - nvecs = pci_alloc_irq_vectors(stdev->pdev, 1, 4, - PCI_IRQ_MSIX | PCI_IRQ_MSI); + if (nirqs < 4) + nirqs = 4; + + nvecs = pci_alloc_irq_vectors(stdev->pdev, 1, nirqs, + PCI_IRQ_MSIX | PCI_IRQ_MSI | + PCI_IRQ_VIRTUAL); if (nvecs < 0) return nvecs;