Linux Virtualization - Feb 2014 - [PATCH v2] virtio: Use pci_enable_msix_exact() instead of pci_enable_msix()

Hi Rusty et al,

Based on recently accepted to the mainline pci_enable_msix_exact() function,
I am sending a updated version of the patch. Please, let me know if it does
not work for you and you need and incremental update from the previous version.

Thanks!


-- 
Regards,
Alexander Gordeev
agordeev at redhat.com

As result of deprecation of MSI-X/MSI enablement functions
pci_enable_msix() and pci_enable_msi_block() all drivers
using these two interfaces need to be updated to use the
new pci_enable_msi_range()  or pci_enable_msi_exact()
and pci_enable_msix_range() or pci_enable_msix_exact()
interfaces.

Signed-off-by: Alexander Gordeev <agordeev at redhat.com>
Cc: Rusty Russell <rusty at rustcorp.com.au>
Cc: "Michael S. Tsirkin" <mst at redhat.com>
Cc: virtio-dev at lists.oasis-open.org
Cc: virtualization at lists.linux-foundation.org
Cc: linux-pci at vger.kernel.org
---
 drivers/virtio/virtio_pci.c |    6 ++----
 1 files changed, 2 insertions(+), 4 deletions(-)

diff --git a/drivers/virtio/virtio_pci.c b/drivers/virtio/virtio_pci.c
index a416f9b..101db3f 100644
--- a/drivers/virtio/virtio_pci.c
+++ b/drivers/virtio/virtio_pci.c
@@ -333,10 +333,8 @@ static int vp_request_msix_vectors(struct virtio_device
*vdev, int nvectors,
 	for (i = 0; i < nvectors; ++i)
 		vp_dev->msix_entries[i].entry = i;
 
-	/* pci_enable_msix returns positive if we can't get this many. */
-	err = pci_enable_msix(vp_dev->pci_dev, vp_dev->msix_entries, nvectors);
-	if (err > 0)
-		err = -ENOSPC;
+	err = pci_enable_msix_exact(vp_dev->pci_dev,
+				    vp_dev->msix_entries, nvectors);
 	if (err)
 		goto error;
 	vp_dev->msix_enabled = 1;
-- 
1.7.7.6

-- 
Regards,
Alexander Gordeev
agordeev at redhat.com

On Fri, Feb 21, 2014 at 06:01:28PM +0100, Alexander Gordeev
wrote:
> As result of deprecation of MSI-X/MSI enablement functions
> pci_enable_msix() and pci_enable_msi_block() all drivers
> using these two interfaces need to be updated to use the
> new pci_enable_msi_range()  or pci_enable_msi_exact()
> and pci_enable_msix_range() or pci_enable_msix_exact()
> interfaces.

Acked-by: Michael S. Tsirkin <mst at redhat.com>
> Signed-off-by: Alexander Gordeev <agordeev at redhat.com>
> Cc: Rusty Russell <rusty at rustcorp.com.au>
> Cc: "Michael S. Tsirkin" <mst at redhat.com>
> Cc: virtio-dev at lists.oasis-open.org
> Cc: virtualization at lists.linux-foundation.org
> Cc: linux-pci at vger.kernel.org
> ---
>  drivers/virtio/virtio_pci.c |    6 ++----
>  1 files changed, 2 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/virtio/virtio_pci.c b/drivers/virtio/virtio_pci.c
> index a416f9b..101db3f 100644
> --- a/drivers/virtio/virtio_pci.c
> +++ b/drivers/virtio/virtio_pci.c
> @@ -333,10 +333,8 @@ static int vp_request_msix_vectors(struct
virtio_device *vdev, int nvectors,
>  	for (i = 0; i < nvectors; ++i)
>  		vp_dev->msix_entries[i].entry = i;
>  
> -	/* pci_enable_msix returns positive if we can't get this many. */
> -	err = pci_enable_msix(vp_dev->pci_dev, vp_dev->msix_entries,
nvectors);
> -	if (err > 0)
> -		err = -ENOSPC;
> +	err = pci_enable_msix_exact(vp_dev->pci_dev,
> +				    vp_dev->msix_entries, nvectors);
>  	if (err)
>  		goto error;
>  	vp_dev->msix_enabled = 1;
> -- 
> 1.7.7.6
> 
> -- 
> Regards,
> Alexander Gordeev
> agordeev at redhat.com