On Thu, 21 Sep 2023 15:40:37 +0300
Yishai Hadas <yishaih@xxxxxxxxxx> wrote:
> Expose vfio_pci_core_setup_barmap() to be used by drivers.
>
> This will let drivers to mmap a BAR and re-use it from both vfio and the
> driver when it's applicable.
>
> This API will be used in the next patches by the vfio/virtio coming
> driver.
>
> Signed-off-by: Yishai Hadas <yishaih@xxxxxxxxxx>
> ---
> drivers/vfio/pci/vfio_pci_core.c | 25 +++++++++++++++++++++++++
> drivers/vfio/pci/vfio_pci_rdwr.c | 28 ++--------------------------
> include/linux/vfio_pci_core.h | 1 +
> 3 files changed, 28 insertions(+), 26 deletions(-)
>
> diff --git a/drivers/vfio/pci/vfio_pci_core.c b/drivers/vfio/pci/vfio_pci_core.c
> index 1929103ee59a..b56111ed8a8c 100644
> --- a/drivers/vfio/pci/vfio_pci_core.c
> +++ b/drivers/vfio/pci/vfio_pci_core.c
> @@ -684,6 +684,31 @@ void vfio_pci_core_disable(struct vfio_pci_core_device *vdev)
> }
> EXPORT_SYMBOL_GPL(vfio_pci_core_disable);
>
> +int vfio_pci_core_setup_barmap(struct vfio_pci_core_device *vdev, int bar)
> +{
> + struct pci_dev *pdev = vdev->pdev;
> + void __iomem *io;
> + int ret;
> +
> + 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;
> +}
> +EXPORT_SYMBOL(vfio_pci_core_setup_barmap);
Not to endorse the rest of this yet, but minimally _GPL, same for the
following patch. Thanks,
Alex
> +
> void vfio_pci_core_close_device(struct vfio_device *core_vdev)
> {
> struct vfio_pci_core_device *vdev =
> diff --git a/drivers/vfio/pci/vfio_pci_rdwr.c b/drivers/vfio/pci/vfio_pci_rdwr.c
> index e27de61ac9fe..6f08b3ecbb89 100644
> --- a/drivers/vfio/pci/vfio_pci_rdwr.c
> +++ b/drivers/vfio/pci/vfio_pci_rdwr.c
> @@ -200,30 +200,6 @@ static ssize_t do_io_rw(struct vfio_pci_core_device *vdev, bool test_mem,
> return done;
> }
>
> -static int vfio_pci_setup_barmap(struct vfio_pci_core_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_core_device *vdev, char __user *buf,
> size_t count, loff_t *ppos, bool iswrite)
> {
> @@ -262,7 +238,7 @@ ssize_t vfio_pci_bar_rw(struct vfio_pci_core_device *vdev, char __user *buf,
> }
> x_end = end;
> } else {
> - int ret = vfio_pci_setup_barmap(vdev, bar);
> + int ret = vfio_pci_core_setup_barmap(vdev, bar);
> if (ret) {
> done = ret;
> goto out;
> @@ -438,7 +414,7 @@ int vfio_pci_ioeventfd(struct vfio_pci_core_device *vdev, loff_t offset,
> return -EINVAL;
> #endif
>
> - ret = vfio_pci_setup_barmap(vdev, bar);
> + ret = vfio_pci_core_setup_barmap(vdev, bar);
> if (ret)
> return ret;
>
> diff --git a/include/linux/vfio_pci_core.h b/include/linux/vfio_pci_core.h
> index 562e8754869d..67ac58e20e1d 100644
> --- a/include/linux/vfio_pci_core.h
> +++ b/include/linux/vfio_pci_core.h
> @@ -127,6 +127,7 @@ int vfio_pci_core_match(struct vfio_device *core_vdev, char *buf);
> int vfio_pci_core_enable(struct vfio_pci_core_device *vdev);
> void vfio_pci_core_disable(struct vfio_pci_core_device *vdev);
> void vfio_pci_core_finish_enable(struct vfio_pci_core_device *vdev);
> +int vfio_pci_core_setup_barmap(struct vfio_pci_core_device *vdev, int bar);
> pci_ers_result_t vfio_pci_core_aer_err_detected(struct pci_dev *pdev,
> pci_channel_state_t state);
>
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