diff options
| author | Logan Gunthorpe <logang@deltatee.com> | 2019-05-24 00:30:52 +0200 |
|---|---|---|
| committer | Jon Mason <jdmason@kudzu.us> | 2019-06-13 14:59:38 +0200 |
| commit | fcdf8e95fa3b97097bd4e200f0ee04df85b04d99 (patch) | |
| tree | c65d75739834d4e8a688c5e368ef7d36c815e6a4 | |
| parent | PCI/MSI: Support allocating virtual MSI interrupts (diff) | |
| download | linux-fcdf8e95fa3b97097bd4e200f0ee04df85b04d99.tar.xz linux-fcdf8e95fa3b97097bd4e200f0ee04df85b04d99.zip | |
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>
| -rw-r--r-- | drivers/pci/switch/switchtec.c | 12 |
1 files changed, 10 insertions, 2 deletions
diff --git a/drivers/pci/switch/switchtec.c b/drivers/pci/switch/switchtec.c index bebbde4ebec0..8c94cd3fd1f2 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; |