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PCI/switchtec: Add module parameter to request more interrupts

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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 <logang@deltatee.com>
Cc: Bjorn Helgaas <bhelgaas@google.com>
Signed-off-by: Jon Mason <jdmason@kudzu.us>
This commit is contained in:
Logan Gunthorpe 2019-05-23 16:30:52 -06:00 committed by Jon Mason
parent d7cc609fb6
commit fcdf8e95fa
1 changed files with 10 additions and 2 deletions
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12
drivers/pci/switch/switchtec.c
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@ -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;