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Subject[PATCH] Xen PCI fronted fixes for 2.6.39
Date
I am proposing these three patches for 2.6.39.

The first is to take advantage of the new method of requesting
a Linux IRQ and providing the Xen PIRQ value. The second
makes it possible for a PV guest to bootup if the backend has provided
incorrect values. [*2]

Lastly, the third is to remove deprecated code.

Konrad Rzeszutek Wilk (2):
pci/xen: Use xen_allocate_pirq_msi
xen-pcifront: Sanity check the MSI/MSI-X values

Tejun Heo (1):
xen-pcifront: don't use flush_scheduled_work()

arch/x86/pci/xen.c | 6 +++---
drivers/pci/xen-pcifront.c | 20 +++++++++++++++-----
2 files changed, 18 insertions(+), 8 deletions(-)
diff --git a/arch/x86/pci/xen.c b/arch/x86/pci/xen.c
index 25cd4a0..6432f75 100644
--- a/arch/x86/pci/xen.c
+++ b/arch/x86/pci/xen.c
@@ -157,14 +157,14 @@ static int xen_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
goto error;
i = 0;
list_for_each_entry(msidesc, &dev->msi_list, list) {
- irq = xen_allocate_pirq(v[i], 0, /* not sharable */
+ xen_allocate_pirq_msi(
(type == PCI_CAP_ID_MSIX) ?
- "pcifront-msi-x" : "pcifront-msi");
+ "pcifront-msi-x" : "pcifront-msi",
+ &irq, &v[i], XEN_ALLOC_IRQ);
if (irq < 0) {
ret = -1;
goto free;
}
-
ret = set_irq_msi(irq, msidesc);
if (ret)
goto error_while;
diff --git a/drivers/pci/xen-pcifront.c b/drivers/pci/xen-pcifront.c
index 3a5a6fc..dd615d9 100644
--- a/drivers/pci/xen-pcifront.c
+++ b/drivers/pci/xen-pcifront.c
@@ -277,13 +277,20 @@ static int pci_frontend_enable_msix(struct pci_dev *dev,
if (likely(!err)) {
if (likely(!op.value)) {
/* we get the result */
- for (i = 0; i < nvec; i++)
+ for (i = 0; i < nvec; i++) {
+ if (op.msix_entries[i].vector <= 0) {
+ dev_warn(&dev->dev, "MSI-X entry %d" \
+ " is zero!\n", i);
+ err = -EINVAL;
+ continue;
+ }
*(*vector+i) = op.msix_entries[i].vector;
- return 0;
+ }
+ return err;
} else {
printk(KERN_DEBUG "enable msix get value %x\n",
op.value);
- return op.value;
+ return err;
}
} else {
dev_err(&dev->dev, "enable msix get err %x\n", err);
@@ -325,6 +332,10 @@ static int pci_frontend_enable_msi(struct pci_dev *dev, int **vector)
err = do_pci_op(pdev, &op);
if (likely(!err)) {
*(*vector) = op.value;
+ if (op.value <= 0) {
+ dev_warn(&dev->dev, "MSI entry is zero!\n");
+ err = -EINVAL;
+ }
} else {
dev_err(&dev->dev, "pci frontend enable msi failed for dev "
"%x:%x\n", op.bus, op.devfn);
@@ -733,8 +744,7 @@ static void free_pdev(struct pcifront_device *pdev)

pcifront_free_roots(pdev);

- /*For PCIE_AER error handling job*/
- flush_scheduled_work();
+ cancel_work_sync(&pdev->op_work);

if (pdev->irq >= 0)
unbind_from_irqhandler(pdev->irq, pdev);

[*2]: as so:

0.877864] e1000e: Intel(R) PRO/1000 Network Driver - 1.2.20-k2
[ 0.877874] e1000e: Copyright(c) 1999 - 2011 Intel Corporation.
[ 0.877957] e1000e 0000:00:00.0: enabling device (0000 -> 0002)
[ 0.878054] e1000e 0000:00:00.0: Xen PCI mapped GSI16 to IRQ27
[ 0.878056] e1000e 0000:00:00.0: setting latency timer to 64
[ 0.879924] e1000e 0000:00:00.0: MSI-X entry 0 is zero!
[ 0.879935] e1000e 0000:00:00.0: MSI-X entry 1 is zero!
[ 0.879940] e1000e 0000:00:00.0: MSI-X entry 2 is zero!
[ 0.880207] e1000e 0000:00:00.0: (unregistered net_device): Failed to initialize MSI-X interrupts. Falling back to MSI interrupts.
[ 0.880730] e1000e 0000:00:00.0: MSI entry is zero!
[ 0.880788] e1000e 0000:00:00.0: (unregistered net_device): Failed to initialize MSI interrupts. Falling back to legacy interrupts.
[ 0.880945] e1000e 0000:00:00.0: Disabling ASPM L0s
[ 0.977188] e1000e 0000:00:00.0: eth0: (PCI Express:2.5GB/s:Width x1) 00:1b:21:61:49:00
[ 0.977201] e1000e 0000:00:00.0: eth0: Intel(R) PRO/1000 Network Connection
[ 0.977217] e1000e 0000:00:00.0: eth0: MAC: 3, PHY: 8, PBA No: E46981-003
...

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