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authorLogan Gunthorpe <logang@deltatee.com>2019-05-23 16:30:52 -0600
committerJon Mason <jdmason@kudzu.us>2019-06-13 08:59:38 -0400
commitfcdf8e95fa3b97097bd4e200f0ee04df85b04d99 (patch)
treec65d75739834d4e8a688c5e368ef7d36c815e6a4
parentd7cc609fb679e11dc2b00cbe6c50cbd37ec4bfa2 (diff)
downloadlinux-fcdf8e95fa3b97097bd4e200f0ee04df85b04d99.tar.gz
linux-fcdf8e95fa3b97097bd4e200f0ee04df85b04d99.tar.xz
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.c12
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;