Re: [RFC PATCH V3 04/17] PCI: SRIOV: add VF enable/disable hook

[Wei Yang <weiyang@linux.vnet.ibm.com>]

On Mon, Jun 23, 2014 at 03:03:10PM +1000, Gavin Shan wrote:
>On Tue, Jun 10, 2014 at 09:56:26AM +0800, Wei Yang wrote:
>>VFs are dynamically created/released when driver enable them. On some
>>platforms, like PowerNV, special resources are necessary to enable VFs.
>>
>>This patch adds two hooks for platform initialization before creating the VFs.
>>
>>Signed-off-by: Wei Yang <weiyang@linux.vnet.ibm.com>
>>---
>> drivers/pci/iov.c |   19 +++++++++++++++++++
>> 1 file changed, 19 insertions(+)
>>
>>diff --git a/drivers/pci/iov.c b/drivers/pci/iov.c
>>index 1d21f43..cc87773 100644
>>--- a/drivers/pci/iov.c
>>+++ b/drivers/pci/iov.c
>>@@ -250,6 +250,11 @@ static void sriov_disable_migration(struct pci_dev *dev)
>> 	iounmap(iov->mstate);
>> }
>>
>>+int __weak pcibios_sriov_enable(struct pci_dev *pdev, u16 vf_num)
>>+{
>>+       return 0;
>>+}
>>+
>> static int sriov_enable(struct pci_dev *dev, int nr_virtfn)
>> {
>> 	int rc;
>>@@ -260,6 +265,7 @@ static int sriov_enable(struct pci_dev *dev, int nr_virtfn)
>> 	struct pci_dev *pdev;
>> 	struct pci_sriov *iov = dev->sriov;
>> 	int bars = 0;
>>+	int retval;
>>
>> 	if (!nr_virtfn)
>> 		return 0;
>>@@ -334,6 +340,12 @@ static int sriov_enable(struct pci_dev *dev, int nr_virtfn)
>> 	if (nr_virtfn < initial)
>> 		initial = nr_virtfn;
>>
>>+	if ((retval = pcibios_sriov_enable(dev, initial))) {
>>+		dev_err(&dev->dev, "Failure %d from pcibios_sriov_setup()\n",
>>+				retval);
>
>		dev_err(&dev->dev, "Failure %d from pcibios_sriov_enable()\n",
>			retval);

Thanks

>
>>+		return retval;
>>+	}
>>+
>> 	for (i = 0; i < initial; i++) {
>> 		rc = virtfn_add(dev, i, 0);
>> 		if (rc)
>>@@ -368,6 +380,11 @@ failed:
>> 	return rc;
>> }
>>
>>+int __weak pcibios_sriov_disable(struct pci_dev *pdev)
>>+{
>>+       return 0;
>>+}
>>+
>> static void sriov_disable(struct pci_dev *dev)
>> {
>> 	int i;
>>@@ -382,6 +399,8 @@ static void sriov_disable(struct pci_dev *dev)
>> 	for (i = 0; i < iov->num_VFs; i++)
>> 		virtfn_remove(dev, i, 0);
>>
>>+	pcibios_sriov_disable(dev);
>>+
>> 	iov->ctrl &= ~(PCI_SRIOV_CTRL_VFE | PCI_SRIOV_CTRL_MSE);
>> 	pci_cfg_access_lock(dev);
>> 	pci_write_config_word(dev, iov->pos + PCI_SRIOV_CTRL, iov->ctrl);
>
>Thanks,
>Gavin

-- 
Richard Yang
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