* [PATCH v2 1/3] scsi: arcmsr: Add driver module parameter msi_enable
@ 2017-11-28 1:28 Ching Huang
2017-11-28 13:58 ` Christoph Hellwig
0 siblings, 1 reply; 3+ messages in thread
From: Ching Huang @ 2017-11-28 1:28 UTC (permalink / raw)
To: martin.petersen, James.Bottomley, linux-scsi, linux-kernel,
dan.carpenter, hch
From: Ching Huang <ching2048@areca.com.tw>
Add module parameter msi_enable to has a chance to disable msi interrupt if between controller and system has
msi INT compatible issue.
Signed-off-by: Ching Huang <ching2048@areca.com.tw>
---
diff -uprN a/drivers/scsi/arcmsr/arcmsr_hba.c b/drivers/scsi/arcmsr/arcmsr_hba.c
--- a/drivers/scsi/arcmsr/arcmsr_hba.c 2017-11-23 14:29:26.000000000 +0800
+++ b/drivers/scsi/arcmsr/arcmsr_hba.c 2017-11-24 15:16:20.000000000 +0800
@@ -75,6 +75,10 @@ MODULE_DESCRIPTION("Areca ARC11xx/12xx/1
MODULE_LICENSE("Dual BSD/GPL");
MODULE_VERSION(ARCMSR_DRIVER_VERSION);
+static int msi_enable = 1;
+module_param(msi_enable, int, S_IRUGO);
+MODULE_PARM_DESC(msi_enable, "Enable MSI interrupt(0 ~ 1), msi_enable=1(enable), =0(disable)");
+
static int host_can_queue = ARCMSR_DEFAULT_OUTSTANDING_CMD;
module_param(host_can_queue, int, S_IRUGO);
MODULE_PARM_DESC(host_can_queue, " adapter queue depth(32 ~ 1024), default is 128");
@@ -831,11 +835,17 @@ arcmsr_request_irq(struct pci_dev *pdev,
pr_info("arcmsr%d: msi-x enabled\n", acb->host->host_no);
flags = 0;
} else {
- nvec = pci_alloc_irq_vectors(pdev, 1, 1,
- PCI_IRQ_MSI | PCI_IRQ_LEGACY);
+ if (msi_enable == 1) {
+ nvec = pci_alloc_irq_vectors(pdev, 1, 1, PCI_IRQ_MSI);
+ if (nvec == 1) {
+ dev_info(&pdev->dev, "msi enabled\n");
+ goto msi_int1;
+ }
+ }
+ nvec = pci_alloc_irq_vectors(pdev, 1, 1, PCI_IRQ_LEGACY);
if (nvec < 1)
return FAILED;
-
+msi_int1:
flags = IRQF_SHARED;
}
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [PATCH v2 1/3] scsi: arcmsr: Add driver module parameter msi_enable
2017-11-28 1:28 [PATCH v2 1/3] scsi: arcmsr: Add driver module parameter msi_enable Ching Huang
@ 2017-11-28 13:58 ` Christoph Hellwig
2017-11-29 0:24 ` Ching Huang
0 siblings, 1 reply; 3+ messages in thread
From: Christoph Hellwig @ 2017-11-28 13:58 UTC (permalink / raw)
To: Ching Huang
Cc: martin.petersen, James.Bottomley, linux-scsi, linux-kernel,
dan.carpenter, hch
On Tue, Nov 28, 2017 at 09:28:44AM +0800, Ching Huang wrote:
> From: Ching Huang <ching2048@areca.com.tw>
>
> Add module parameter msi_enable to has a chance to disable msi interrupt if between controller and system has
> msi INT compatible issue.
If there is a system issue the system will need a quirk, and not every
driver.
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [PATCH v2 1/3] scsi: arcmsr: Add driver module parameter msi_enable
2017-11-28 13:58 ` Christoph Hellwig
@ 2017-11-29 0:24 ` Ching Huang
0 siblings, 0 replies; 3+ messages in thread
From: Ching Huang @ 2017-11-29 0:24 UTC (permalink / raw)
To: Christoph Hellwig
Cc: martin.petersen, James.Bottomley, linux-scsi, linux-kernel,
dan.carpenter
On Tue, 2017-11-28 at 05:58 -0800, Christoph Hellwig wrote:
> On Tue, Nov 28, 2017 at 09:28:44AM +0800, Ching Huang wrote:
> > From: Ching Huang <ching2048@areca.com.tw>
> >
> > Add module parameter msi_enable to has a chance to disable msi interrupt if between controller and system has
> > msi INT compatible issue.
>
> If there is a system issue the system will need a quirk, and not every
> driver.
Yeah, but hardware compatibility is hard to clarify. This solution can make both happy.
^ permalink raw reply [flat|nested] 3+ messages in thread
end of thread, other threads:[~2017-11-29 8:24 UTC | newest]
Thread overview: 3+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2017-11-28 1:28 [PATCH v2 1/3] scsi: arcmsr: Add driver module parameter msi_enable Ching Huang
2017-11-28 13:58 ` Christoph Hellwig
2017-11-29 0:24 ` Ching Huang
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).