xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

ioat: kill msix_single_vector support

Browse Source 
Once we have determined that we will not have all of our desired msix
vectors there is no point in attempting a single msix allocation.  The
driver will already need to read registers to determine the source of
the interrupt the fact that it is msix is moot.  Fallback directly to
msi.

Reported-by: Alexander Gordeev <agordeev@redhat.com>
Cc: Dave Jiang <dave.jiang@intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
This commit is contained in:
Dan Williams
2013-11-13 16:29:52 -08:00
parent 09ec0f583f
commit 4c5d9619e0
3 changed files with 3 additions and 32 deletions
Download Patch File Download Diff File Expand all files Collapse all files

27
drivers/dma/ioat/dma.c
View File

@@ -869,8 +869,7 @@ static char ioat_interrupt_style[32] = "msix";
module_param_string(ioat_interrupt_style, ioat_interrupt_style,
sizeof(ioat_interrupt_style), 0644);
MODULE_PARM_DESC(ioat_interrupt_style,
"set ioat interrupt style: msix (default), "
"msix-single-vector, msi, intx)");
"set ioat interrupt style: msix (default), msi, intx");
/**
* ioat_dma_setup_interrupts - setup interrupt handler
@@ -888,8 +887,6 @@ int ioat_dma_setup_interrupts(struct ioatdma_device *device)
if (!strcmp(ioat_interrupt_style, "msix"))
goto msix;
if (!strcmp(ioat_interrupt_style, "msix-single-vector"))
goto msix_single_vector;
if (!strcmp(ioat_interrupt_style, "msi"))
goto msi;
if (!strcmp(ioat_interrupt_style, "intx"))
@@ -904,10 +901,8 @@ msix:
device->msix_entries[i].entry = i;
err = pci_enable_msix(pdev, device->msix_entries, msixcnt);
if (err < 0)
if (err)
goto msi;
if (err > 0)
goto msix_single_vector;
for (i = 0; i < msixcnt; i++) {
msix = &device->msix_entries[i];
@@ -921,29 +916,13 @@ msix:
chan = ioat_chan_by_index(device, j);
devm_free_irq(dev, msix->vector, chan);
}
goto msix_single_vector;
goto msi;
}
}
intrctrl |= IOAT_INTRCTRL_MSIX_VECTOR_CONTROL;
device->irq_mode = IOAT_MSIX;
goto done;
msix_single_vector:
msix = &device->msix_entries[0];
msix->entry = 0;
err = pci_enable_msix(pdev, device->msix_entries, 1);
if (err)
goto msi;
err = devm_request_irq(dev, msix->vector, ioat_dma_do_interrupt, 0,
"ioat-msix", device);
if (err) {
pci_disable_msix(pdev);
goto msi;
}
device->irq_mode = IOAT_MSIX_SINGLE;
goto done;
msi:
err = pci_enable_msi(pdev);
if (err)