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[SCSI] stex: add MSI support

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This adds the MSI support (default 0=off)

Signed-off-by: Ed Lin <ed.lin@promise.com>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
This commit is contained in:
Ed Lin 2009-03-31 17:30:25 -08:00 committed by James Bottomley
parent f149816162
commit 99946f8141
1 changed files with 43 additions and 5 deletions
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48
drivers/scsi/stex.c
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@ -292,11 +292,15 @@ struct st_hba {
struct st_ccb *wait_ccb;
unsigned int mu_status;
int out_req_cnt;
unsigned int cardtype;
int msi_enabled;
int out_req_cnt;
};
static int msi;
module_param(msi, int, 0);
MODULE_PARM_DESC(msi, "Enable Message Signaled Interrupts(0=off, 1=on)");
static const char console_inq_page[] =
{
0x03,0x00,0x03,0x03,0xFA,0x00,0x00,0x30,
@ -1041,6 +1045,40 @@ static int stex_set_dma_mask(struct pci_dev * pdev)
return ret;
}
static int stex_request_irq(struct st_hba *hba)
{
struct pci_dev *pdev = hba->pdev;
int status;
if (msi) {
status = pci_enable_msi(pdev);
if (status != 0)
printk(KERN_ERR DRV_NAME
"(%s): error %d setting up MSI\n",
pci_name(pdev), status);
else
hba->msi_enabled = 1;
} else
hba->msi_enabled = 0;
status = request_irq(pdev->irq, stex_intr, IRQF_SHARED, DRV_NAME, hba);
if (status != 0) {
if (hba->msi_enabled)
pci_disable_msi(pdev);
}
return status;
}
static void stex_free_irq(struct st_hba *hba)
{
struct pci_dev *pdev = hba->pdev;
free_irq(pdev->irq, hba);
if (hba->msi_enabled)
pci_disable_msi(pdev);
}
static int __devinit
stex_probe(struct pci_dev *pdev, const struct pci_device_id *id)
{
@ -1125,7 +1163,7 @@ stex_probe(struct pci_dev *pdev, const struct pci_device_id *id)
hba->host = host;
hba->pdev = pdev;
err = request_irq(pdev->irq, stex_intr, IRQF_SHARED, DRV_NAME, hba);
err = stex_request_irq(hba);
if (err) {
printk(KERN_ERR DRV_NAME "(%s): request irq failed\n",
pci_name(pdev));
@ -1157,7 +1195,7 @@ stex_probe(struct pci_dev *pdev, const struct pci_device_id *id)
return 0;
out_free_irq:
free_irq(pdev->irq, hba);
stex_free_irq(hba);
out_pci_free:
dma_free_coherent(&pdev->dev, hba->dma_size,
hba->dma_mem, hba->dma_handle);
@ -1216,7 +1254,7 @@ static void stex_hba_stop(struct st_hba *hba)
static void stex_hba_free(struct st_hba *hba)
{
free_irq(hba->pdev->irq, hba);
stex_free_irq(hba);
iounmap(hba->mmio_base);