Re: [PATCH] nvidiafb: detect the hardware support before removing console.

[Dave Airlie]

On Mon, 6 Feb 2023 at 17:52, Zeno Davatz <zdavatz@xxxxxxxxx> wrote:
>
> Dear Dave
>
> Thank you for your patch.
>
> On Sun, Feb 5, 2023 at 10:07 PM Dave Airlie <airlied@xxxxxxxxx> wrote:
> >
> > From: Dave Airlie <airlied@xxxxxxxxxx>
> >
> > This driver removed the console, but hasn't yet decided if it could
> > take over the console yet. Instead of doing that, probe the hw for
> > support and then remove the console afterwards.
> >
> > Signed-off-by: Dave Airlie <airlied@xxxxxxxxxx>
> > Fixes: https://bugzilla.kernel.org/show_bug.cgi?id=216859
> > Reported-by: Zeno Davatz <zdavatz@xxxxxxxxx>
> > ---
> >  drivers/video/fbdev/nvidia/nvidia.c | 81 +++++++++++++++--------------
> >  1 file changed, 42 insertions(+), 39 deletions(-)
> >
> > diff --git a/drivers/video/fbdev/nvidia/nvidia.c b/drivers/video/fbdev/nvidia/nvidia.c
> > index 1960916098d4..e60a276b4855 100644
> > --- a/drivers/video/fbdev/nvidia/nvidia.c
> > +++ b/drivers/video/fbdev/nvidia/nvidia.c
> > @@ -1197,17 +1197,17 @@ static int nvidia_set_fbinfo(struct fb_info *info)
> >         return nvidiafb_check_var(&info->var, info);
> >  }
> >
> > -static u32 nvidia_get_chipset(struct fb_info *info)
> > +static u32 nvidia_get_chipset(struct pci_dev *pci_dev,
> > +                             volatile u32 __iomem *REGS)
> >  {
> > -       struct nvidia_par *par = info->par;
> > -       u32 id = (par->pci_dev->vendor << 16) | par->pci_dev->device;
> > +       u32 id = (pci_dev->vendor << 16) | pci_dev->device;
> >
> >         printk(KERN_INFO PFX "Device ID: %x \n", id);
> >
> >         if ((id & 0xfff0) == 0x00f0 ||
> >             (id & 0xfff0) == 0x02e0) {
> >                 /* pci-e */
> > -               id = NV_RD32(par->REGS, 0x1800);
> > +               id = NV_RD32(REGS, 0x1800);
> >
> >                 if ((id & 0x0000ffff) == 0x000010DE)
> >                         id = 0x10DE0000 | (id >> 16);
> > @@ -1220,12 +1220,11 @@ static u32 nvidia_get_chipset(struct fb_info *info)
> >         return id;
> >  }
> >
> > -static u32 nvidia_get_arch(struct fb_info *info)
> > +static u32 nvidia_get_arch(u32 Chipset)
> >  {
> > -       struct nvidia_par *par = info->par;
> >         u32 arch = 0;
> >
> > -       switch (par->Chipset & 0x0ff0) {
> > +       switch (Chipset & 0x0ff0) {
> >         case 0x0100:            /* GeForce 256 */
> >         case 0x0110:            /* GeForce2 MX */
> >         case 0x0150:            /* GeForce2 */
> > @@ -1278,16 +1277,44 @@ static int nvidiafb_probe(struct pci_dev *pd, const struct pci_device_id *ent)
> >         struct fb_info *info;
> >         unsigned short cmd;
> >         int ret;
> > +       volatile u32 __iomem *REGS;
> > +       int Chipset;
> > +       u32 Architecture;
> >
> >         NVTRACE_ENTER();
> >         assert(pd != NULL);
> >
> > +       if (pci_enable_device(pd)) {
> > +               printk(KERN_ERR PFX "cannot enable PCI device\n");
> > +               return -ENODEV;
> > +       }
> > +
> > +       /* enable IO and mem if not already done */
> > +       pci_read_config_word(pd, PCI_COMMAND, &cmd);
> > +       cmd |= (PCI_COMMAND_IO | PCI_COMMAND_MEMORY);
> > +       pci_write_config_word(pd, PCI_COMMAND, cmd);
> > +
> > +       nvidiafb_fix.mmio_start = pci_resource_start(pd, 0);
> > +       nvidiafb_fix.mmio_len = pci_resource_len(pd, 0);
> > +
> > +       REGS = ioremap(nvidiafb_fix.mmio_start, nvidiafb_fix.mmio_len);
> > +       if (!REGS) {
> > +               printk(KERN_ERR PFX "cannot ioremap MMIO base\n");
> > +               return -ENODEV;
> > +       }
> > +
> > +       Chipset = nvidia_get_chipset(pd, REGS);
> > +       Architecture = nvidia_get_arch(Chipset);
> > +       if (Architecture == 0) {
> > +               printk(KERN_ERR PFX "unknown NV_ARCH\n");
> > +               goto err_out;
> > +       }
> > +
> >         ret = aperture_remove_conflicting_pci_devices(pd, "nvidiafb");
> >         if (ret)
> > -               return ret;
> > +               goto err_out;
> >
> >         info = framebuffer_alloc(sizeof(struct nvidia_par), &pd->dev);
> > -
> >         if (!info)
> >                 goto err_out;
> >
> > @@ -1298,11 +1325,6 @@ static int nvidiafb_probe(struct pci_dev *pd, const struct pci_device_id *ent)
> >         if (info->pixmap.addr == NULL)
> >                 goto err_out_kfree;
> >
> > -       if (pci_enable_device(pd)) {
> > -               printk(KERN_ERR PFX "cannot enable PCI device\n");
> > -               goto err_out_enable;
> > -       }
> > -
> >         if (pci_request_regions(pd, "nvidiafb")) {
> >                 printk(KERN_ERR PFX "cannot request PCI regions\n");
> >                 goto err_out_enable;
> > @@ -1318,34 +1340,17 @@ static int nvidiafb_probe(struct pci_dev *pd, const struct pci_device_id *ent)
> >         par->paneltweak = paneltweak;
> >         par->reverse_i2c = reverse_i2c;
> >
> > -       /* enable IO and mem if not already done */
> > -       pci_read_config_word(pd, PCI_COMMAND, &cmd);
> > -       cmd |= (PCI_COMMAND_IO | PCI_COMMAND_MEMORY);
> > -       pci_write_config_word(pd, PCI_COMMAND, cmd);
> > -
> > -       nvidiafb_fix.mmio_start = pci_resource_start(pd, 0);
> >         nvidiafb_fix.smem_start = pci_resource_start(pd, 1);
> > -       nvidiafb_fix.mmio_len = pci_resource_len(pd, 0);
> > -
> > -       par->REGS = ioremap(nvidiafb_fix.mmio_start, nvidiafb_fix.mmio_len);
> >
> > -       if (!par->REGS) {
> > -               printk(KERN_ERR PFX "cannot ioremap MMIO base\n");
> > -               goto err_out_free_base0;
> > -       }
> > +       par->REGS = REGS;
> >
> > -       par->Chipset = nvidia_get_chipset(info);
> > -       par->Architecture = nvidia_get_arch(info);
> > -
> > -       if (par->Architecture == 0) {
> > -               printk(KERN_ERR PFX "unknown NV_ARCH\n");
> > -               goto err_out_arch;
> > -       }
> > +       par->Chipset = Chipset;
> > +       par->Architecture = Architecture;
> >
> >         sprintf(nvidiafb_fix.id, "NV%x", (pd->device & 0x0ff0) >> 4);
> >
> >         if (NVCommonSetup(info))
> > -               goto err_out_arch;
> > +               goto err_out_free_base0;
> >
> >         par->FbAddress = nvidiafb_fix.smem_start;
> >         par->FbMapSize = par->RamAmountKBytes * 1024;
> > @@ -1401,7 +1406,6 @@ static int nvidiafb_probe(struct pci_dev *pd, const struct pci_device_id *ent)
> >                 goto err_out_iounmap_fb;
> >         }
> >
> > -
> >         printk(KERN_INFO PFX
> >                "PCI nVidia %s framebuffer (%dMB @ 0x%lX)\n",
> >                info->fix.id,
> > @@ -1415,15 +1419,14 @@ static int nvidiafb_probe(struct pci_dev *pd, const struct pci_device_id *ent)
> >  err_out_free_base1:
> >         fb_destroy_modedb(info->monspecs.modedb);
> >         nvidia_delete_i2c_busses(par);
> > -err_out_arch:
> > -       iounmap(par->REGS);
> > - err_out_free_base0:
> > +err_out_free_base0:
> >         pci_release_regions(pd);
> >  err_out_enable:
> >         kfree(info->pixmap.addr);
> >  err_out_kfree:
> >         framebuffer_release(info);
> >  err_out:
> > +       iounmap(REGS);
> >         return -ENODEV;
> >  }
> >
> > --
> > 2.38.1
>
> This patch fails for me.

I've based the patch on 6.2-rc7, please make sure to not have the
previous revert committed, this is to replace that patch.

Dave.
>
> sudo patch -p1 < /tmp/patch
> Passwort:
> patching file drivers/video/fbdev/nvidia/nvidia.c
> Hunk #1 FAILED at 1197.
> Hunk #2 FAILED at 1220.
> Hunk #3 FAILED at 1278.
> Hunk #4 FAILED at 1298.
> Hunk #5 FAILED at 1318.
> Hunk #6 FAILED at 1401.
> Hunk #7 FAILED at 1415.
> 7 out of 7 hunks FAILED -- saving rejects to file
> drivers/video/fbdev/nvidia/nvidia.c.rej
>
> See attachments.
>
> Best
> Zeno