linux-kernel - Re: [PATCH RESEND V5 2/3] misc/pvpanic : add pci interface for pvpanic

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Message-ID: <CAHp75VcohyNtL-cYAwN1jjBmgh4A8dVsB6RSkA60AFAD00WSuA@mail.gmail.com>
Date:   Thu, 3 Jan 2019 22:05:12 +0200
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Peng Hao <peng.hao2@....com.cn>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Arnd Bergmann <arnd@...db.de>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH RESEND V5 2/3] misc/pvpanic : add pci interface for pvpanic

On Thu, Dec 20, 2018 at 6:57 AM Peng Hao <peng.hao2@....com.cn> wrote:
>
> Support pvpanic as a pci device in guest kernel.
>

After my vacation followed by holidays I hardly remember what I suggested.
Looking to this code I would recommend to split it in a way how it's
done for ChipIdea USB driver, for example.
(drivers/usb/chipidea if I'm not mistaken)

> Suggested-by: Andy Shevchenko <andy.shevchenko@...il.com>
> [Use pcim_* API. - Andy]
> Signed-off-by: Peng Hao <peng.hao2@....com.cn>
> ---
>  drivers/misc/pvpanic.c | 72 ++++++++++++++++++++++++++++++++++++++++++++++++--
>  1 file changed, 70 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/misc/pvpanic.c b/drivers/misc/pvpanic.c
> index f84ed30..c30bf62 100644
> --- a/drivers/misc/pvpanic.c
> +++ b/drivers/misc/pvpanic.c
> @@ -13,9 +13,12 @@
>  #include <linux/module.h>
>  #include <linux/of.h>
>  #include <linux/of_address.h>
> +#include <linux/pci.h>
>  #include <linux/platform_device.h>
>  #include <linux/types.h>
>
> +#define PCI_VENDOR_ID_REDHAT             0x1b36
> +#define PCI_DEVICE_ID_REDHAT_PVPANIC     0x0101
>  static void __iomem *base;
>
>  #define PVPANIC_PANICKED        (1 << 0)
> @@ -172,12 +175,76 @@ static int pvpanic_mmio_remove(struct platform_device *pdev)
>         .remove = pvpanic_mmio_remove,
>  };
>
> +#ifdef CONFIG_PCI
> +static const struct pci_device_id pvpanic_pci_id_tbl[]  = {
> +       { PCI_DEVICE(PCI_VENDOR_ID_REDHAT, PCI_DEVICE_ID_REDHAT_PVPANIC),},
> +       {}
> +};
> +
> +static int pvpanic_pci_probe(struct pci_dev *pdev,
> +                            const struct pci_device_id *ent)
> +{
> +       int ret;
> +
> +       ret = pcim_enable_device(pdev);
> +       if (ret < 0)
> +               return ret;
> +
> +       ret = pcim_iomap_regions(pdev, 1 << 0, pci_name(pdev));
> +       if (ret)
> +               return ret;
> +
> +       base = pcim_iomap_table(pdev)[0];
> +
> +       atomic_notifier_chain_register(&panic_notifier_list,
> +                                      &pvpanic_panic_nb);
> +       return 0;
> +}
> +
> +static void pvpanic_pci_remove(struct pci_dev *pdev)
> +{
> +       atomic_notifier_chain_unregister(&panic_notifier_list,
> +                                        &pvpanic_panic_nb);
> +}
> +
> +static struct pci_driver pvpanic_pci_driver = {
> +       .name =         "pvpanic-pci",
> +       .id_table =     pvpanic_pci_id_tbl,
> +       .probe =        pvpanic_pci_probe,
> +       .remove =       pvpanic_pci_remove,
> +};
> +
> +static int pvpanic_register_pci_driver(void)
> +{
> +       return pci_register_driver(&pvpanic_pci_driver);
> +}
> +
> +static void pvpanic_unregister_pci_driver(void)
> +{
> +       pci_unregister_driver(&pvpanic_pci_driver);
> +}
> +#else
> +static int pvpanic_register_pci_driver(void)
> +{
> +       return 0;
> +}
> +
> +static void pvpanic_unregister_pci_driver(void) {}
> +#endif
> +
>  static int __init pvpanic_mmio_init(void)
>  {
> +       int r1, r2;
> +
>         if (acpi_disabled)
> -               return platform_driver_register(&pvpanic_mmio_driver);
> +               r1 = platform_driver_register(&pvpanic_mmio_driver);
> +       else
> +               r1 = pvpanic_register_acpi_driver();
> +       r2 = pvpanic_register_pci_driver();
> +       if (r1 && r2) /* all drivers register failed */
> +               return 1;
>         else
> -               return pvpanic_register_acpi_driver();
> +               return 0;
>  }
>
>  static void __exit pvpanic_mmio_exit(void)
> @@ -186,6 +253,7 @@ static void __exit pvpanic_mmio_exit(void)
>                 platform_driver_unregister(&pvpanic_mmio_driver);
>         else
>                 pvpanic_unregister_acpi_driver();
> +       pvpanic_unregister_pci_driver();
>  }
>
>  module_init(pvpanic_mmio_init);
> --
> 1.8.3.1
>


-- 
With Best Regards,
Andy Shevchenko