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

From: Zeno Davatz
Date: Mon Feb 06 2023 - 03:01:40 EST

Dear Dave

On Mon, Feb 6, 2023 at 8:54 AM Dave Airlie <airlied@xxxxxxxxx> wrote:
>
> 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.

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?

/usr/src/linux> cat .git/config
[core]
repositoryformatversion = 0
filemode = true
bare = false
logallrefupdates = true
[remote "origin"]
fetch = +refs/heads/*:refs/remotes/origin/*
url = git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6.git
[branch "master"]
remote = origin
merge = refs/heads/master
[remote "stable"]
url = https://kernel.googlesource.com/pub/scm/linux/kernel/git/stable/linux-stable
fetch = +refs/heads/*:refs/remotes/stable/*

I am pulling from the "master" branch.

Best
Zeno