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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 <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
View File

@ -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;