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SubjectRe: [PATCH 2/2] hwmon: (k10temp) Use API function to access System Management Network
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

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