From: Logan Gunthorpe <logang@deltatee.com>
To: linux-kernel@vger.kernel.org, linux-ntb@googlegroups.com,
linux-pci@vger.kernel.org, iommu@lists.linux-foundation.org,
linux-kselftest@vger.kernel.org, Jon Mason <jdmason@kudzu.us>,
Joerg Roedel <joro@8bytes.org>
Cc: Bjorn Helgaas <bhelgaas@google.com>,
Allen Hubbe <allenbh@gmail.com>,
Dave Jiang <dave.jiang@intel.com>,
Serge Semin <fancer.lancer@gmail.com>,
Eric Pilmore <epilmore@gigaio.com>,
Logan Gunthorpe <logang@deltatee.com>
Subject: [PATCH v5 02/10] PCI/switchtec: Add module parameter to request more interrupts
Date: Thu, 23 May 2019 16:30:52 -0600 [thread overview]
Message-ID: <20190523223100.5526-3-logang@deltatee.com> (raw)
In-Reply-To: <20190523223100.5526-1-logang@deltatee.com>
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>
---
drivers/pci/switch/switchtec.c | 12 ++++++++++--
1 file changed, 10 insertions(+), 2 deletions(-)
diff --git a/drivers/pci/switch/switchtec.c b/drivers/pci/switch/switchtec.c
index e22766c79fe9..8b1db78197d9 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);
@@ -1247,8 +1251,12 @@ 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;
--
2.20.1
next prev parent reply other threads:[~2019-05-23 22:31 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-05-23 22:30 [PATCH v5 00/10] Support using MSI interrupts in ntb_transport Logan Gunthorpe
2019-05-23 22:30 ` [PATCH v5 01/10] PCI/MSI: Support allocating virtual MSI interrupts Logan Gunthorpe
2019-05-23 22:30 ` Logan Gunthorpe [this message]
2019-05-23 22:30 ` [PATCH v5 03/10] NTB: Introduce helper functions to calculate logical port number Logan Gunthorpe
2019-05-23 22:30 ` [PATCH v5 04/10] NTB: Introduce functions to calculate multi-port resource index Logan Gunthorpe
2019-05-23 22:30 ` [PATCH v5 05/10] NTB: Rename ntb.c to support multiple source files in the module Logan Gunthorpe
2019-05-23 22:30 ` [PATCH v5 06/10] NTB: Introduce MSI library Logan Gunthorpe
2019-05-23 22:30 ` [PATCH v5 07/10] NTB: Introduce NTB MSI Test Client Logan Gunthorpe
2019-05-23 22:30 ` [PATCH v5 08/10] NTB: Add ntb_msi_test support to ntb_test Logan Gunthorpe
2019-05-23 22:30 ` [PATCH v5 09/10] NTB: Add MSI interrupt support to ntb_transport Logan Gunthorpe
2019-05-23 22:31 ` [PATCH v5 10/10] NTB: Describe the ntb_msi_test client in the documentation Logan Gunthorpe
2019-06-13 13:30 ` [PATCH v5 00/10] Support using MSI interrupts in ntb_transport Jon Mason
2019-06-13 15:46 ` Logan Gunthorpe
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