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SubjectRe: [PATCH 1/3] vfio/pci: Pull BAR mapping setup from read-write path
Date
Hi Alex,
On 28/02/18 21:14, Alex Williamson wrote:
> This creates a common helper that we'll use for ioeventfd setup.

>
> Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Reviewed-by: Eric Auger <eric.auger@redhat.com>

Thanks

Eric
> ---
> drivers/vfio/pci/vfio_pci_rdwr.c | 39 ++++++++++++++++++++++++++------------
> 1 file changed, 27 insertions(+), 12 deletions(-)
>
> diff --git a/drivers/vfio/pci/vfio_pci_rdwr.c b/drivers/vfio/pci/vfio_pci_rdwr.c
> index 357243d76f10..5f2b376dcebd 100644
> --- a/drivers/vfio/pci/vfio_pci_rdwr.c
> +++ b/drivers/vfio/pci/vfio_pci_rdwr.c
> @@ -113,6 +113,30 @@ static ssize_t do_io_rw(void __iomem *io, char __user *buf,
> return done;
> }
>
> +static int vfio_pci_setup_barmap(struct vfio_pci_device *vdev, int bar)
> +{
> + struct pci_dev *pdev = vdev->pdev;
> + int ret;
> + void __iomem *io;
> +
> + if (vdev->barmap[bar])
> + return 0;
> +
> + ret = pci_request_selected_regions(pdev, 1 << bar, "vfio");
> + if (ret)
> + return ret;
> +
> + io = pci_iomap(pdev, bar, 0);
> + if (!io) {
> + pci_release_selected_regions(pdev, 1 << bar);
> + return -ENOMEM;
> + }
> +
> + vdev->barmap[bar] = io;
> +
> + return 0;
> +}
> +
> ssize_t vfio_pci_bar_rw(struct vfio_pci_device *vdev, char __user *buf,
> size_t count, loff_t *ppos, bool iswrite)
> {
> @@ -147,22 +171,13 @@ ssize_t vfio_pci_bar_rw(struct vfio_pci_device *vdev, char __user *buf,
> if (!io)
> return -ENOMEM;
> x_end = end;
> - } else if (!vdev->barmap[bar]) {
> - int ret;
> -
> - ret = pci_request_selected_regions(pdev, 1 << bar, "vfio");
> + } else {
> + int ret = vfio_pci_setup_barmap(vdev, bar);
> if (ret)
> return ret;
>
> - io = pci_iomap(pdev, bar, 0);
> - if (!io) {
> - pci_release_selected_regions(pdev, 1 << bar);
> - return -ENOMEM;
> - }
> -
> - vdev->barmap[bar] = io;
> - } else
> io = vdev->barmap[bar];
> + }
>
> if (bar == vdev->msix_bar) {
> x_start = vdev->msix_offset;
>

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