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From:   Gabriel C <nix.or.die@gmail.com>
Date:   Sun, 29 Apr 2018 06:32:53 +0200
Message-ID: <CAEJqkghGFL-SryxWkDxbFoMo5vGjNha59ik01UnqZGaJVQBMPg@mail.gmail.com>
Subject: Re: [PATCH 2/2] hwmon: (k10temp) Use API function to access System
 Management Network
To:     Guenter Roeck <linux@roeck-us.net>
Cc:     Thomas Gleixner <tglx@linutronix.de>,
        Clemens Ladisch <clemens@ladisch.de>, X86 ML <x86@kernel.org>,
        Jean Delvare <jdelvare@suse.com>,
        LKML <linux-kernel@vger.kernel.org>, linux-hwmon@vger.kernel.org,
        Borislav Petkov <bp@suse.de>,
        Yazen Ghannam <Yazen.Ghannam@amd.com>,
        Brian Woods <brian.woods@amd.com>
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Sender: linux-kernel-owner@vger.kernel.org
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2018-04-29 3:54 GMT+02:00 Guenter Roeck <linux@roeck-us.net>:
> The SMN (System Management Network) on Family 17h AMD CPUs is also accessed
> from other drivers, specifically EDAC. Accessing it directly is racy.
> On top of that, accessing the SMN through root bridge 00:00 is wrong on
> multi-die CPUs and may result in reading the temperature from the wrong
> die. Use available API functions to fix the problem.
>
> For this to work, also change the Raven Ridge PCI device ID to point to
> Data Fabric Function 3, since this ID is used by the API functions to
> find the CPU node.
>
> Signed-off-by: Guenter Roeck <linux@roeck-us.net>
> ---
>  drivers/hwmon/k10temp.c | 11 ++++++-----
>  1 file changed, 6 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/hwmon/k10temp.c b/drivers/hwmon/k10temp.c
> index b06bb1f90853..00e785afae0d 100644
> --- a/drivers/hwmon/k10temp.c
> +++ b/drivers/hwmon/k10temp.c
> @@ -23,6 +23,7 @@
>  #include <linux/init.h>
>  #include <linux/module.h>
>  #include <linux/pci.h>
> +#include <asm/amd_nb.h>
>  #include <asm/processor.h>
>
>  MODULE_DESCRIPTION("AMD Family 10h+ CPU core temperature monitor");
> @@ -40,8 +41,8 @@ static DEFINE_MUTEX(nb_smu_ind_mutex);
>  #define PCI_DEVICE_ID_AMD_17H_DF_F3    0x1463
>  #endif
>
> -#ifndef PCI_DEVICE_ID_AMD_17H_RR_NB
> -#define PCI_DEVICE_ID_AMD_17H_RR_NB    0x15d0
> +#ifndef PCI_DEVICE_ID_AMD_17H_RR_DF_F3
> +#define PCI_DEVICE_ID_AMD_17H_RR_DF_F3 0x14eb
>  #endif
>
>  /* CPUID function 0x80000001, ebx */
> @@ -136,8 +137,8 @@ static void read_tempreg_nb_f15(struct pci_dev *pdev, u32 *regval)
>
>  static void read_tempreg_nb_f17(struct pci_dev *pdev, u32 *regval)
>  {
> -       amd_nb_index_read(pdev, PCI_DEVFN(0, 0), 0x60,
> -                         F17H_M01H_REPORTED_TEMP_CTRL_OFFSET, regval);
> +       amd_smn_read(amd_pci_dev_to_node_id(pdev),
> +                    F17H_M01H_REPORTED_TEMP_CTRL_OFFSET, regval);
>  }
>
>  static ssize_t temp1_input_show(struct device *dev,
> @@ -323,7 +324,7 @@ static const struct pci_device_id k10temp_id_table[] = {
>         { PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_16H_NB_F3) },
>         { PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_16H_M30H_NB_F3) },
>         { PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_17H_DF_F3) },
> -       { PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_17H_RR_NB) },
> +       { PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_17H_RR_DF_F3) },
>         {}
>  };
>  MODULE_DEVICE_TABLE(pci, k10temp_id_table);
> --
> 2.7.4
>

Works fine for me on top stable and on top v4.17-rc2-398-gcdface520934

Tested-by: Gabriel Craciunescu <nix.or.die@gmail.com>

Regards