Re: [PATCH v4] vdpa: solidrun: Replace deprecated PCI functions

["Michael S. Tsirkin" <mst@redhat.com>]

On Mon, Jan 20, 2025 at 10:13:03AM +0100, Philipp Stanner wrote:
> On Thu, 2024-12-19 at 10:51 +0100, Stefano Garzarella wrote:
> > On Thu, Dec 19, 2024 at 10:44:29AM +0100, Philipp Stanner wrote:
> > > From: Philipp Stanner <pstanner@redhat.com>
> > > 
> > > The PCI functions
> > > 
> > > 	pcim_iomap_regions()
> > > 	pcim_iounmap_regions()
> > > 	pcim_iomap_table()
> > > 
> > > have been deprecated by the PCI subsystem.
> > > 
> > > Replace these functions with their successors pcim_iomap_region()
> > > and
> > > pcim_iounmap_region().
> > > 
> > > Signed-off-by: Philipp Stanner <pstanner@redhat.com>
> > > ---
> > > Changes in v4:
> > >  - snet_open_vf_bar(): use distinct temporary variable to ensure
> > >    snet->bar is never an ERR_PTR. (Stefano)
> > 
> > Thanks for that!
> > 
> > I don't have a device to test, but it LGTM:
> > 
> > Acked-by: Stefano Garzarella <sgarzare@redhat.com>
> 
> Hi all,
> 
> can someone please finally merge this?
> 
> Thanks,
> Philipp
> 
> 
> > 
> > 
> > > 
> > > Changes in v3:
> > >  - Move __iomem *io declaration into the loop. (Stefano)
> > > 
> > > Changes in v2:
> > >  - Fix build warning because of dead variable.
> > >  - Make "bars_found" a boolean, since only true or false are
> > > relevant.
> > > ---
> > > drivers/vdpa/solidrun/snet_main.c | 57 +++++++++++++++-------------
> > > ---
> > > 1 file changed, 28 insertions(+), 29 deletions(-)
> > > 
> > > diff --git a/drivers/vdpa/solidrun/snet_main.c
> > > b/drivers/vdpa/solidrun/snet_main.c
> > > index c8b74980dbd1..55ec51c17ab3 100644
> > > --- a/drivers/vdpa/solidrun/snet_main.c
> > > +++ b/drivers/vdpa/solidrun/snet_main.c
> > > @@ -556,58 +556,60 @@ static const struct vdpa_config_ops
> > > snet_config_ops = {
> > > static int psnet_open_pf_bar(struct pci_dev *pdev, struct psnet
> > > *psnet)
> > > {
> > > 	char *name;
> > > -	int ret, i, mask = 0;
> > > +	unsigned short i;
> > > +	bool bars_found = false;
> > > +
> > > +	name = devm_kasprintf(&pdev->dev, GFP_KERNEL, "psnet[%s]-
> > > bars", pci_name(pdev));
> > > +	if (!name)
> > > +		return -ENOMEM;
> > > +
> > > 	/* We don't know which BAR will be used to communicate..
> > > 	 * We will map every bar with len > 0.
> > > 	 *
> > > 	 * Later, we will discover the BAR and unmap all other
> > > BARs.
> > > 	 */
> > > 	for (i = 0; i < PCI_STD_NUM_BARS; i++) {
> > > -		if (pci_resource_len(pdev, i))
> > > -			mask |= (1 << i);
> > > +		void __iomem *io;
> > > +
> > > +		if (pci_resource_len(pdev, i) == 0)
> > > +			continue;
> > > +
> > > +		io = pcim_iomap_region(pdev, i, name);
> > > +		if (IS_ERR(io)) {
> > > +			SNET_ERR(pdev, "Failed to request and map
> > > PCI BARs\n");
> > > +			return PTR_ERR(io);
> > > +		}
> > > +
> > > +		psnet->bars[i] = io;
> > > +		bars_found = true;
> > > 	}
> > > 
> > > 	/* No BAR can be used.. */
> > > -	if (!mask) {
> > > +	if (!bars_found) {
> > > 		SNET_ERR(pdev, "Failed to find a PCI BAR\n");
> > > 		return -ENODEV;
> > > 	}
> > > 
> > > -	name = devm_kasprintf(&pdev->dev, GFP_KERNEL, "psnet[%s]-
> > > bars", pci_name(pdev));
> > > -	if (!name)
> > > -		return -ENOMEM;
> > > -
> > > -	ret = pcim_iomap_regions(pdev, mask, name);
> > > -	if (ret) {
> > > -		SNET_ERR(pdev, "Failed to request and map PCI
> > > BARs\n");
> > > -		return ret;
> > > -	}
> > > -
> > > -	for (i = 0; i < PCI_STD_NUM_BARS; i++) {
> > > -		if (mask & (1 << i))
> > > -			psnet->bars[i] =
> > > pcim_iomap_table(pdev)[i];
> > > -	}
> > > -
> > > 	return 0;
> > > }
> > > 
> > > static int snet_open_vf_bar(struct pci_dev *pdev, struct snet
> > > *snet)
> > > {
> > > 	char *name;
> > > -	int ret;
> > > +	void __iomem *io;
> > > 
> > > 	name = devm_kasprintf(&pdev->dev, GFP_KERNEL, "snet[%s]-
> > > bars", pci_name(pdev));
> > > 	if (!name)
> > > 		return -ENOMEM;
> > > 
> > > 	/* Request and map BAR */
> > > -	ret = pcim_iomap_regions(pdev, BIT(snet->psnet-
> > > >cfg.vf_bar), name);
> > > -	if (ret) {
> > > +	io = pcim_iomap_region(pdev, snet->psnet->cfg.vf_bar,
> > > name);
> > > +	if (IS_ERR(io)) {
> > > 		SNET_ERR(pdev, "Failed to request and map PCI BAR
> > > for a VF\n");
> > > -		return ret;
> > > +		return PTR_ERR(io);
> > > 	}
> > > 
> > > -	snet->bar = pcim_iomap_table(pdev)[snet->psnet-
> > > >cfg.vf_bar];
> > > +	snet->bar = io;
> > > 
> > > 	return 0;
> > > }
> > > @@ -656,15 +658,12 @@ static int psnet_detect_bar(struct psnet
> > > *psnet, u32 off)
> > > 
> > > static void psnet_unmap_unused_bars(struct pci_dev *pdev, struct
> > > psnet *psnet)
> > > {
> > > -	int i, mask = 0;
> > > +	unsigned short i;
> > > 
> > > 	for (i = 0; i < PCI_STD_NUM_BARS; i++) {
> > > 		if (psnet->bars[i] && i != psnet->barno)
> > > -			mask |= (1 << i);
> > > +			pcim_iounmap_region(pdev, i);
> > > 	}
> > > -
> > > -	if (mask)
> > > -		pcim_iounmap_regions(pdev, mask);
> > > }
> > > 
> > > /* Read SNET config from PCI BAR */
> > > -- 
> > > 2.47.1
> > > 
> > > 
> > 

it's in my tree and linux-next