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SubjectRe: [PATCH 2/2] hwmon: (k10temp) Use API function to access System Management Network
2018-04-29 19:46 GMT+02:00 Guenter Roeck <linux@roeck-us.net>:
> On 04/28/2018 06:54 PM, Guenter Roeck wrote:
>>
>> 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
>
>
> This should have been 0x15eb. I'll resend after a week or so, waiting for
> more feedback.


re-tested with that too .. Doesn't seems to matter here ..

with original patch:

crazy@ant:~/Work/Linux/linux$ sensors
k10temp-pci-00f3
Adapter: PCI adapter
Tdie: +22.2°C (high = +70.0°C)
Tctl: +22.2°C

k10temp-pci-00e3
Adapter: PCI adapter
Tdie: +23.8°C (high = +70.0°C)
Tctl: +23.8°C

k10temp-pci-00d3
Adapter: PCI adapter
Tdie: +23.0°C (high = +70.0°C)
Tctl: +23.0°C

k10temp-pci-00c3
Adapter: PCI adapter
Tdie: +25.0°C (high = +70.0°C)
Tctl: +25.0°C

k10temp-pci-00fb
Adapter: PCI adapter
Tdie: +22.8°C (high = +70.0°C)
Tctl: +22.8°C

k10temp-pci-00eb
Adapter: PCI adapter
Tdie: +23.2°C (high = +70.0°C)
Tctl: +23.2°C

k10temp-pci-00db
Adapter: PCI adapter
Tdie: +22.8°C (high = +70.0°C)
Tctl: +22.8°C

k10temp-pci-00cb
Adapter: PCI adapter
Tdie: +22.6°C (high = +70.0°C)
Tctl: +22.6°C

now with 0x15eb

crazy@ant:~/Work/Linux/linux$ sudo rmmod k10temp
crazy@ant:~/Work/Linux/linux$ git grep -w PCI_DEVICE_ID_AMD_17H_RR_DF_F3
arch/x86/kernel/amd_nb.c:#define PCI_DEVICE_ID_AMD_17H_RR_DF_F3 0x15eb
arch/x86/kernel/amd_nb.c: { PCI_DEVICE(PCI_VENDOR_ID_AMD,
PCI_DEVICE_ID_AMD_17H_RR_DF_F3) },
drivers/hwmon/k10temp.c:#ifndef PCI_DEVICE_ID_AMD_17H_RR_DF_F3
drivers/hwmon/k10temp.c:#define PCI_DEVICE_ID_AMD_17H_RR_DF_F3 0x15eb
drivers/hwmon/k10temp.c: { PCI_VDEVICE(AMD,
PCI_DEVICE_ID_AMD_17H_RR_DF_F3) },
crazy@ant:~/Work/Linux/linux$ sudo insmod ./drivers/hwmon/k10temp.ko
crazy@ant:~/Work/Linux/linux$ sensors
k10temp-pci-00f3
Adapter: PCI adapter
Tdie: +22.2°C (high = +70.0°C)
Tctl: +22.2°C

k10temp-pci-00e3
Adapter: PCI adapter
Tdie: +23.8°C (high = +70.0°C)
Tctl: +23.8°C

k10temp-pci-00d3
Adapter: PCI adapter
Tdie: +23.0°C (high = +70.0°C)
Tctl: +23.0°C

k10temp-pci-00c3
Adapter: PCI adapter
Tdie: +25.0°C (high = +70.0°C)
Tctl: +25.0°C

k10temp-pci-00fb
Adapter: PCI adapter
Tdie: +22.9°C (high = +70.0°C)
Tctl: +22.9°C

k10temp-pci-00eb
Adapter: PCI adapter
Tdie: +23.2°C (high = +70.0°C)
Tctl: +23.2°C

k10temp-pci-00db
Adapter: PCI adapter
Tdie: +22.8°C (high = +70.0°C)
Tctl: +22.8°C

k10temp-pci-00cb
Adapter: PCI adapter
Tdie: +22.8°C (high = +70.0°C)
Tctl: +22.8°C


>
>> #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);
>>
>

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