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From:   Zeno Davatz <zdavatz@gmail.com>
Date:   Mon, 6 Feb 2023 09:37:57 +0100
Message-ID: <CAOkhzLUspmZjC0x6nJoHyc9nijqZu7BOWc8vsqHSRbQhVzd=Gw@mail.gmail.com>
Subject: Re: [PATCH] nvidiafb: detect the hardware support before removing console.
To:     Dave Airlie <airlied@gmail.com>
Cc:     Bjorn Helgaas <helgaas@kernel.org>,
        Bjorn Helgaas <bjorn@helgaas.com>, linux-fbdev@vger.kernel.org,
        dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org,
        Dave Airlie <airlied@redhat.com>
Content-Type: text/plain; charset="UTF-8"
Precedence: bulk

Dear Dave

On Mon, Feb 6, 2023 at 9:10 AM Dave Airlie <airlied@gmail.com> wrote:
>
> On Mon, 6 Feb 2023 at 18:01, Zeno Davatz <zdavatz@gmail.com> wrote:
> >
> > Dear Dave
> >
> > On Mon, Feb 6, 2023 at 8:54 AM Dave Airlie <airlied@gmail.com> wrote:
> > >
> > > On Mon, 6 Feb 2023 at 17:52, Zeno Davatz <zdavatz@gmail.com> wrote:
> > > >
> > > > Dear Dave
> > > >
> > > > Thank you for your patch.
> > > >
> > > > On Sun, Feb 5, 2023 at 10:07 PM Dave Airlie <airlied@gmail.com> wrote:
> > > > >
> > > > > From: Dave Airlie <airlied@redhat.com>
> > > > >
> > > > > 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@redhat.com>
> > > > > Fixes: https://bugzilla.kernel.org/show_bug.cgi?id=216859
> > > > > Reported-by: Zeno Davatz <zdavatz@gmail.com>
> > > > > ---
> > > > >  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.
> >
> > Can you guide me through the steps please?
> >
> > I done:
> >
> > 1. cd /usr/src/linux
> > 2. sudo git pull
> > 3. then I applied your patch.
> >
> > Am I doing something wrong?
>
> What is your top of tree commit? (git log)
>
> have you got any commits on top?
>
> git reset --hard origin/master should reset your tree to Linus top.

1. git log shows "d2d11f342b179f1894a901f143ec7c008caba43e"
2. No, no patches on top.
3. I am doing the following steps:
/usr/src/linux> sudo git reset --hard origin/master
Passwort:
HEAD ist jetzt bei d2d11f342b17 Merge branch 'fixes' of
git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
/usr/src/linux> sudo patch -p1 < /tmp/patch
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

Best
Zeno