[PATCH v2 0/3] Extend k10temp support for more APUs

[PATCH v2 0/3] Extend k10temp support for more APUs

[Mario Limonciello]

Extend existing code to cover more missing client APUs.  Some logic changes
and failure handling will make this more scalable for other future APUs as
well.

Changes from v1->v2
 patch 1/6 (zen2/zen3 ID's)
    - drop from series, now queued upstream
 patch 2/6
  - drop, don't rename existing stuff for no reason
 patch 3/6
  - add parenthesis around offset
 patch 4/6 (error handling)
  - re-order, move last in the series
  - don't show kernel log warnings, move into errors passed to userspace
 patch 5/6 (don't show tdie)
    - drop from series, now queued upstream
 patch 6/6 (add Yellow carp)
    - no changes
Mario Limonciello (3):
  hwmon: (k10temp): Rework the temperature offset calculation
  hwmon: (k10temp): Add support for yellow carp
  hwmon: (k10temp): Show errors failing to read

 arch/x86/kernel/amd_nb.c |   5 ++
 drivers/hwmon/k10temp.c  | 108 ++++++++++++++++++++++++---------------
 include/linux/pci_ids.h  |   1 +
 3 files changed, 74 insertions(+), 40 deletions(-)

-- 
2.25.1

[PATCH v2 1/3] hwmon: (k10temp): Rework the temperature offset calculation

[Mario Limonciello]

Some of the existing assumptions made do not scale properly
to new silicon in upcoming changes.  This commit should cause
no functional changes to existing silicon.

Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>
---
 drivers/hwmon/k10temp.c | 18 ++++++++++++------
 1 file changed, 12 insertions(+), 6 deletions(-)

diff --git a/drivers/hwmon/k10temp.c b/drivers/hwmon/k10temp.c
index f6b325b8463e..159dbad73d82 100644
--- a/drivers/hwmon/k10temp.c
+++ b/drivers/hwmon/k10temp.c
@@ -65,10 +65,11 @@ static DEFINE_MUTEX(nb_smu_ind_mutex);
 #define F15H_M60H_HARDWARE_TEMP_CTRL_OFFSET	0xd8200c64
 #define F15H_M60H_REPORTED_TEMP_CTRL_OFFSET	0xd8200ca4
 
-/* Common for Zen CPU families (Family 17h and 18h) */
-#define ZEN_REPORTED_TEMP_CTRL_OFFSET		0x00059800
+/* Common for Zen CPU families (Family 17h and 18h and 19h) */
+#define ZEN_REPORTED_TEMP_CTRL_BASE		0x00059800
 
-#define ZEN_CCD_TEMP(x)				(0x00059954 + ((x) * 4))
+#define ZEN_CCD_TEMP(offset, x)			(ZEN_REPORTED_TEMP_CTRL_BASE + \
+						 (offset) + ((x) * 4))
 #define ZEN_CCD_TEMP_VALID			BIT(11)
 #define ZEN_CCD_TEMP_MASK			GENMASK(10, 0)
 
@@ -103,6 +104,7 @@ struct k10temp_data {
 	u32 temp_adjust_mask;
 	u32 show_temp;
 	bool is_zen;
+	u32 ccd_offset;
 };
 
 #define TCTL_BIT	0
@@ -163,7 +165,7 @@ static void read_tempreg_nb_f15(struct pci_dev *pdev, u32 *regval)
 static void read_tempreg_nb_zen(struct pci_dev *pdev, u32 *regval)
 {
 	amd_smn_read(amd_pci_dev_to_node_id(pdev),
-		     ZEN_REPORTED_TEMP_CTRL_OFFSET, regval);
+		     ZEN_REPORTED_TEMP_CTRL_BASE, regval);
 }
 
 static long get_raw_temp(struct k10temp_data *data)
@@ -226,7 +228,8 @@ static int k10temp_read_temp(struct device *dev, u32 attr, int channel,
 			break;
 		case 2 ... 9:		/* Tccd{1-8} */
 			amd_smn_read(amd_pci_dev_to_node_id(data->pdev),
-				     ZEN_CCD_TEMP(channel - 2), &regval);
+				     ZEN_CCD_TEMP(data->ccd_offset, channel - 2),
+						  &regval);
 			*val = (regval & ZEN_CCD_TEMP_MASK) * 125 - 49000;
 			break;
 		default:
@@ -387,7 +390,7 @@ static void k10temp_get_ccd_support(struct pci_dev *pdev,
 
 	for (i = 0; i < limit; i++) {
 		amd_smn_read(amd_pci_dev_to_node_id(pdev),
-			     ZEN_CCD_TEMP(i), &regval);
+			     ZEN_CCD_TEMP(data->ccd_offset, i), &regval);
 		if (regval & ZEN_CCD_TEMP_VALID)
 			data->show_temp |= BIT(TCCD_BIT(i));
 	}
@@ -433,12 +436,14 @@ static int k10temp_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 		case 0x8:	/* Zen+ */
 		case 0x11:	/* Zen APU */
 		case 0x18:	/* Zen+ APU */
+			data->ccd_offset = 0x154;
 			k10temp_get_ccd_support(pdev, data, 4);
 			break;
 		case 0x31:	/* Zen2 Threadripper */
 		case 0x60:	/* Renoir */
 		case 0x68:	/* Lucienne */
 		case 0x71:	/* Zen2 */
+			data->ccd_offset = 0x154;
 			k10temp_get_ccd_support(pdev, data, 8);
 			break;
 		}
@@ -451,6 +456,7 @@ static int k10temp_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 		case 0x0 ... 0x1:	/* Zen3 SP3/TR */
 		case 0x21:		/* Zen3 Ryzen Desktop */
 		case 0x50 ... 0x5f:	/* Green Sardine */
+			data->ccd_offset = 0x154;
 			k10temp_get_ccd_support(pdev, data, 8);
 			break;
 		}
-- 
2.25.1

Re: [PATCH v2 1/3] hwmon: (k10temp): Rework the temperature offset calculation

[Guenter Roeck]

On Fri, Aug 27, 2021 at 03:15:25PM -0500, Mario Limonciello wrote:
> Some of the existing assumptions made do not scale properly
> to new silicon in upcoming changes.  This commit should cause
> no functional changes to existing silicon.
> 
> Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>

Applied.

Thanks,
Guenter

> ---
>  drivers/hwmon/k10temp.c | 18 ++++++++++++------
>  1 file changed, 12 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/hwmon/k10temp.c b/drivers/hwmon/k10temp.c
> index f6b325b8463e..159dbad73d82 100644
> --- a/drivers/hwmon/k10temp.c
> +++ b/drivers/hwmon/k10temp.c
> @@ -65,10 +65,11 @@ static DEFINE_MUTEX(nb_smu_ind_mutex);
>  #define F15H_M60H_HARDWARE_TEMP_CTRL_OFFSET	0xd8200c64
>  #define F15H_M60H_REPORTED_TEMP_CTRL_OFFSET	0xd8200ca4
>  
> -/* Common for Zen CPU families (Family 17h and 18h) */
> -#define ZEN_REPORTED_TEMP_CTRL_OFFSET		0x00059800
> +/* Common for Zen CPU families (Family 17h and 18h and 19h) */
> +#define ZEN_REPORTED_TEMP_CTRL_BASE		0x00059800
>  
> -#define ZEN_CCD_TEMP(x)				(0x00059954 + ((x) * 4))
> +#define ZEN_CCD_TEMP(offset, x)			(ZEN_REPORTED_TEMP_CTRL_BASE + \
> +						 (offset) + ((x) * 4))
>  #define ZEN_CCD_TEMP_VALID			BIT(11)
>  #define ZEN_CCD_TEMP_MASK			GENMASK(10, 0)
>  
> @@ -103,6 +104,7 @@ struct k10temp_data {
>  	u32 temp_adjust_mask;
>  	u32 show_temp;
>  	bool is_zen;
> +	u32 ccd_offset;
>  };
>  
>  #define TCTL_BIT	0
> @@ -163,7 +165,7 @@ static void read_tempreg_nb_f15(struct pci_dev *pdev, u32 *regval)
>  static void read_tempreg_nb_zen(struct pci_dev *pdev, u32 *regval)
>  {
>  	amd_smn_read(amd_pci_dev_to_node_id(pdev),
> -		     ZEN_REPORTED_TEMP_CTRL_OFFSET, regval);
> +		     ZEN_REPORTED_TEMP_CTRL_BASE, regval);
>  }
>  
>  static long get_raw_temp(struct k10temp_data *data)
> @@ -226,7 +228,8 @@ static int k10temp_read_temp(struct device *dev, u32 attr, int channel,
>  			break;
>  		case 2 ... 9:		/* Tccd{1-8} */
>  			amd_smn_read(amd_pci_dev_to_node_id(data->pdev),
> -				     ZEN_CCD_TEMP(channel - 2), &regval);
> +				     ZEN_CCD_TEMP(data->ccd_offset, channel - 2),
> +						  &regval);
>  			*val = (regval & ZEN_CCD_TEMP_MASK) * 125 - 49000;
>  			break;
>  		default:
> @@ -387,7 +390,7 @@ static void k10temp_get_ccd_support(struct pci_dev *pdev,
>  
>  	for (i = 0; i < limit; i++) {
>  		amd_smn_read(amd_pci_dev_to_node_id(pdev),
> -			     ZEN_CCD_TEMP(i), &regval);
> +			     ZEN_CCD_TEMP(data->ccd_offset, i), &regval);
>  		if (regval & ZEN_CCD_TEMP_VALID)
>  			data->show_temp |= BIT(TCCD_BIT(i));
>  	}
> @@ -433,12 +436,14 @@ static int k10temp_probe(struct pci_dev *pdev, const struct pci_device_id *id)
>  		case 0x8:	/* Zen+ */
>  		case 0x11:	/* Zen APU */
>  		case 0x18:	/* Zen+ APU */
> +			data->ccd_offset = 0x154;
>  			k10temp_get_ccd_support(pdev, data, 4);
>  			break;
>  		case 0x31:	/* Zen2 Threadripper */
>  		case 0x60:	/* Renoir */
>  		case 0x68:	/* Lucienne */
>  		case 0x71:	/* Zen2 */
> +			data->ccd_offset = 0x154;
>  			k10temp_get_ccd_support(pdev, data, 8);
>  			break;
>  		}
> @@ -451,6 +456,7 @@ static int k10temp_probe(struct pci_dev *pdev, const struct pci_device_id *id)
>  		case 0x0 ... 0x1:	/* Zen3 SP3/TR */
>  		case 0x21:		/* Zen3 Ryzen Desktop */
>  		case 0x50 ... 0x5f:	/* Green Sardine */
> +			data->ccd_offset = 0x154;
>  			k10temp_get_ccd_support(pdev, data, 8);
>  			break;
>  		}

[PATCH v2 2/3] hwmon: (k10temp): Add support for yellow carp

[Mario Limonciello]

Yellow carp matches same behavior as green sardine and other Zen3
products, but have different CCD offsets.

Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>
---
 arch/x86/kernel/amd_nb.c | 5 +++++
 drivers/hwmon/k10temp.c  | 5 +++++
 include/linux/pci_ids.h  | 1 +
 3 files changed, 11 insertions(+)

diff --git a/arch/x86/kernel/amd_nb.c b/arch/x86/kernel/amd_nb.c
index 23dda362dc0f..c92c9c774c0e 100644
--- a/arch/x86/kernel/amd_nb.c
+++ b/arch/x86/kernel/amd_nb.c
@@ -25,6 +25,8 @@
 #define PCI_DEVICE_ID_AMD_17H_M60H_DF_F4 0x144c
 #define PCI_DEVICE_ID_AMD_17H_M70H_DF_F4 0x1444
 #define PCI_DEVICE_ID_AMD_19H_DF_F4	0x1654
+#define PCI_DEVICE_ID_AMD_19H_M40H_ROOT	0x14b5
+#define PCI_DEVICE_ID_AMD_19H_M40H_DF_F4 0x167d
 #define PCI_DEVICE_ID_AMD_19H_M50H_DF_F4 0x166e
 
 /* Protect the PCI config register pairs used for SMN and DF indirect access. */
@@ -37,6 +39,7 @@ static const struct pci_device_id amd_root_ids[] = {
 	{ PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_17H_M10H_ROOT) },
 	{ PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_17H_M30H_ROOT) },
 	{ PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_17H_M60H_ROOT) },
+	{ PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_19H_M40H_ROOT) },
 	{}
 };
 
@@ -58,6 +61,7 @@ static const struct pci_device_id amd_nb_misc_ids[] = {
 	{ PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_CNB17H_F3) },
 	{ PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_17H_M70H_DF_F3) },
 	{ PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_19H_DF_F3) },
+	{ PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_19H_M40H_DF_F3) },
 	{ PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_19H_M50H_DF_F3) },
 	{}
 };
@@ -74,6 +78,7 @@ static const struct pci_device_id amd_nb_link_ids[] = {
 	{ PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_17H_M60H_DF_F4) },
 	{ PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_17H_M70H_DF_F4) },
 	{ PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_19H_DF_F4) },
+	{ PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_19H_M40H_DF_F4) },
 	{ PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_19H_M50H_DF_F4) },
 	{ PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_CNB17H_F4) },
 	{}
diff --git a/drivers/hwmon/k10temp.c b/drivers/hwmon/k10temp.c
index 159dbad73d82..38bc35ac8135 100644
--- a/drivers/hwmon/k10temp.c
+++ b/drivers/hwmon/k10temp.c
@@ -459,6 +459,10 @@ static int k10temp_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 			data->ccd_offset = 0x154;
 			k10temp_get_ccd_support(pdev, data, 8);
 			break;
+		case 0x40 ... 0x4f:	/* Yellow Carp */
+			data->ccd_offset = 0x300;
+			k10temp_get_ccd_support(pdev, data, 8);
+			break;
 		}
 	} else {
 		data->read_htcreg = read_htcreg_pci;
@@ -499,6 +503,7 @@ static const struct pci_device_id k10temp_id_table[] = {
 	{ PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_17H_M60H_DF_F3) },
 	{ PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_17H_M70H_DF_F3) },
 	{ PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_19H_DF_F3) },
+	{ PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_19H_M40H_DF_F3) },
 	{ PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_19H_M50H_DF_F3) },
 	{ PCI_VDEVICE(HYGON, PCI_DEVICE_ID_AMD_17H_DF_F3) },
 	{}
diff --git a/include/linux/pci_ids.h b/include/linux/pci_ids.h
index 5356ccf1c275..e77a62fd0036 100644
--- a/include/linux/pci_ids.h
+++ b/include/linux/pci_ids.h
@@ -555,6 +555,7 @@
 #define PCI_DEVICE_ID_AMD_17H_M60H_DF_F3 0x144b
 #define PCI_DEVICE_ID_AMD_17H_M70H_DF_F3 0x1443
 #define PCI_DEVICE_ID_AMD_19H_DF_F3	0x1653
+#define PCI_DEVICE_ID_AMD_19H_M40H_DF_F3 0x167c
 #define PCI_DEVICE_ID_AMD_19H_M50H_DF_F3 0x166d
 #define PCI_DEVICE_ID_AMD_CNB17H_F3	0x1703
 #define PCI_DEVICE_ID_AMD_LANCE		0x2000
-- 
2.25.1

Re: [PATCH v2 2/3] hwmon: (k10temp): Add support for yellow carp

[Borislav Petkov]

On Fri, Aug 27, 2021 at 03:15:26PM -0500, Mario Limonciello wrote:
> Yellow carp matches same behavior as green sardine and other Zen3
> products, but have different CCD offsets.
> 
> Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>
> ---
>  arch/x86/kernel/amd_nb.c | 5 +++++
>  drivers/hwmon/k10temp.c  | 5 +++++
>  include/linux/pci_ids.h  | 1 +
>  3 files changed, 11 insertions(+)
> 
> diff --git a/arch/x86/kernel/amd_nb.c b/arch/x86/kernel/amd_nb.c
> index 23dda362dc0f..c92c9c774c0e 100644
> --- a/arch/x86/kernel/amd_nb.c
> +++ b/arch/x86/kernel/amd_nb.c
> @@ -25,6 +25,8 @@
>  #define PCI_DEVICE_ID_AMD_17H_M60H_DF_F4 0x144c
>  #define PCI_DEVICE_ID_AMD_17H_M70H_DF_F4 0x1444
>  #define PCI_DEVICE_ID_AMD_19H_DF_F4	0x1654
> +#define PCI_DEVICE_ID_AMD_19H_M40H_ROOT	0x14b5
> +#define PCI_DEVICE_ID_AMD_19H_M40H_DF_F4 0x167d
>  #define PCI_DEVICE_ID_AMD_19H_M50H_DF_F4 0x166e
>  
>  /* Protect the PCI config register pairs used for SMN and DF indirect access. */
> @@ -37,6 +39,7 @@ static const struct pci_device_id amd_root_ids[] = {
>  	{ PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_17H_M10H_ROOT) },
>  	{ PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_17H_M30H_ROOT) },
>  	{ PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_17H_M60H_ROOT) },
> +	{ PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_19H_M40H_ROOT) },
>  	{}
>  };
>  
> @@ -58,6 +61,7 @@ static const struct pci_device_id amd_nb_misc_ids[] = {
>  	{ PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_CNB17H_F3) },
>  	{ PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_17H_M70H_DF_F3) },
>  	{ PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_19H_DF_F3) },
> +	{ PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_19H_M40H_DF_F3) },
>  	{ PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_19H_M50H_DF_F3) },
>  	{}
>  };
> @@ -74,6 +78,7 @@ static const struct pci_device_id amd_nb_link_ids[] = {
>  	{ PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_17H_M60H_DF_F4) },
>  	{ PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_17H_M70H_DF_F4) },
>  	{ PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_19H_DF_F4) },
> +	{ PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_19H_M40H_DF_F4) },
>  	{ PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_19H_M50H_DF_F4) },
>  	{ PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_CNB17H_F4) },
>  	{}

The x86 bits:

Acked-by: Borislav Petkov <bp@suse.de>

Thx.

-- 
Regards/Gruss,
    Boris.

https://people.kernel.org/tglx/notes-about-netiquette

Re: [PATCH v2 2/3] hwmon: (k10temp): Add support for yellow carp

[Guenter Roeck]

On Fri, Aug 27, 2021 at 03:15:26PM -0500, Mario Limonciello wrote:
> Yellow carp matches same behavior as green sardine and other Zen3
> products, but have different CCD offsets.
> 
> Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>
> Acked-by: Borislav Petkov <bp@suse.de>

Applied.

Thanks,
Guenter

> ---
>  arch/x86/kernel/amd_nb.c | 5 +++++
>  drivers/hwmon/k10temp.c  | 5 +++++
>  include/linux/pci_ids.h  | 1 +
>  3 files changed, 11 insertions(+)
> 
> diff --git a/arch/x86/kernel/amd_nb.c b/arch/x86/kernel/amd_nb.c
> index 23dda362dc0f..c92c9c774c0e 100644
> --- a/arch/x86/kernel/amd_nb.c
> +++ b/arch/x86/kernel/amd_nb.c
> @@ -25,6 +25,8 @@
>  #define PCI_DEVICE_ID_AMD_17H_M60H_DF_F4 0x144c
>  #define PCI_DEVICE_ID_AMD_17H_M70H_DF_F4 0x1444
>  #define PCI_DEVICE_ID_AMD_19H_DF_F4	0x1654
> +#define PCI_DEVICE_ID_AMD_19H_M40H_ROOT	0x14b5
> +#define PCI_DEVICE_ID_AMD_19H_M40H_DF_F4 0x167d
>  #define PCI_DEVICE_ID_AMD_19H_M50H_DF_F4 0x166e
>  
>  /* Protect the PCI config register pairs used for SMN and DF indirect access. */
> @@ -37,6 +39,7 @@ static const struct pci_device_id amd_root_ids[] = {
>  	{ PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_17H_M10H_ROOT) },
>  	{ PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_17H_M30H_ROOT) },
>  	{ PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_17H_M60H_ROOT) },
> +	{ PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_19H_M40H_ROOT) },
>  	{}
>  };
>  
> @@ -58,6 +61,7 @@ static const struct pci_device_id amd_nb_misc_ids[] = {
>  	{ PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_CNB17H_F3) },
>  	{ PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_17H_M70H_DF_F3) },
>  	{ PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_19H_DF_F3) },
> +	{ PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_19H_M40H_DF_F3) },
>  	{ PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_19H_M50H_DF_F3) },
>  	{}
>  };
> @@ -74,6 +78,7 @@ static const struct pci_device_id amd_nb_link_ids[] = {
>  	{ PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_17H_M60H_DF_F4) },
>  	{ PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_17H_M70H_DF_F4) },
>  	{ PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_19H_DF_F4) },
> +	{ PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_19H_M40H_DF_F4) },
>  	{ PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_19H_M50H_DF_F4) },
>  	{ PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_CNB17H_F4) },
>  	{}
> diff --git a/drivers/hwmon/k10temp.c b/drivers/hwmon/k10temp.c
> index 159dbad73d82..38bc35ac8135 100644
> --- a/drivers/hwmon/k10temp.c
> +++ b/drivers/hwmon/k10temp.c
> @@ -459,6 +459,10 @@ static int k10temp_probe(struct pci_dev *pdev, const struct pci_device_id *id)
>  			data->ccd_offset = 0x154;
>  			k10temp_get_ccd_support(pdev, data, 8);
>  			break;
> +		case 0x40 ... 0x4f:	/* Yellow Carp */
> +			data->ccd_offset = 0x300;
> +			k10temp_get_ccd_support(pdev, data, 8);
> +			break;
>  		}
>  	} else {
>  		data->read_htcreg = read_htcreg_pci;
> @@ -499,6 +503,7 @@ static const struct pci_device_id k10temp_id_table[] = {
>  	{ PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_17H_M60H_DF_F3) },
>  	{ PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_17H_M70H_DF_F3) },
>  	{ PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_19H_DF_F3) },
> +	{ PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_19H_M40H_DF_F3) },
>  	{ PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_19H_M50H_DF_F3) },
>  	{ PCI_VDEVICE(HYGON, PCI_DEVICE_ID_AMD_17H_DF_F3) },
>  	{}
> diff --git a/include/linux/pci_ids.h b/include/linux/pci_ids.h
> index 5356ccf1c275..e77a62fd0036 100644
> --- a/include/linux/pci_ids.h
> +++ b/include/linux/pci_ids.h
> @@ -555,6 +555,7 @@
>  #define PCI_DEVICE_ID_AMD_17H_M60H_DF_F3 0x144b
>  #define PCI_DEVICE_ID_AMD_17H_M70H_DF_F3 0x1443
>  #define PCI_DEVICE_ID_AMD_19H_DF_F3	0x1653
> +#define PCI_DEVICE_ID_AMD_19H_M40H_DF_F3 0x167c
>  #define PCI_DEVICE_ID_AMD_19H_M50H_DF_F3 0x166d
>  #define PCI_DEVICE_ID_AMD_CNB17H_F3	0x1703
>  #define PCI_DEVICE_ID_AMD_LANCE		0x2000

[PATCH v2 3/3] hwmon: (k10temp): Show errors failing to read

[Mario Limonciello]

Enabling Yellow Carp was initially not working "properly"
because extra IDs were needed, but this wasn't obvious because fail values
from `amd_smn_read` were ignored.

Don't discard errors from any functions providing them, instead pass up
to the caller.

Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>
---
 drivers/hwmon/k10temp.c | 87 ++++++++++++++++++++++++-----------------
 1 file changed, 52 insertions(+), 35 deletions(-)

diff --git a/drivers/hwmon/k10temp.c b/drivers/hwmon/k10temp.c
index 38bc35ac8135..2edb49d39d22 100644
--- a/drivers/hwmon/k10temp.c
+++ b/drivers/hwmon/k10temp.c
@@ -98,8 +98,8 @@ static DEFINE_MUTEX(nb_smu_ind_mutex);
 
 struct k10temp_data {
 	struct pci_dev *pdev;
-	void (*read_htcreg)(struct pci_dev *pdev, u32 *regval);
-	void (*read_tempreg)(struct pci_dev *pdev, u32 *regval);
+	int (*read_htcreg)(struct pci_dev *pdev, u32 *regval);
+	int (*read_tempreg)(struct pci_dev *pdev, u32 *regval);
 	int temp_offset;
 	u32 temp_adjust_mask;
 	u32 show_temp;
@@ -129,55 +129,65 @@ static const struct tctl_offset tctl_offset_table[] = {
 	{ 0x17, "AMD Ryzen Threadripper 29", 27000 }, /* 29{20,50,70,90}[W]X */
 };
 
-static void read_htcreg_pci(struct pci_dev *pdev, u32 *regval)
+static int read_htcreg_pci(struct pci_dev *pdev, u32 *regval)
 {
-	pci_read_config_dword(pdev, REG_HARDWARE_THERMAL_CONTROL, regval);
+	return pci_read_config_dword(pdev, REG_HARDWARE_THERMAL_CONTROL, regval);
 }
 
-static void read_tempreg_pci(struct pci_dev *pdev, u32 *regval)
+static int read_tempreg_pci(struct pci_dev *pdev, u32 *regval)
 {
-	pci_read_config_dword(pdev, REG_REPORTED_TEMPERATURE, regval);
+	return pci_read_config_dword(pdev, REG_REPORTED_TEMPERATURE, regval);
 }
 
-static void amd_nb_index_read(struct pci_dev *pdev, unsigned int devfn,
+static int amd_nb_index_read(struct pci_dev *pdev, unsigned int devfn,
 			      unsigned int base, int offset, u32 *val)
 {
+	int ret;
+
 	mutex_lock(&nb_smu_ind_mutex);
-	pci_bus_write_config_dword(pdev->bus, devfn,
-				   base, offset);
-	pci_bus_read_config_dword(pdev->bus, devfn,
-				  base + 4, val);
+	ret = pci_bus_write_config_dword(pdev->bus, devfn,
+					 base, offset);
+	if (ret)
+		goto out;
+	ret = pci_bus_read_config_dword(pdev->bus, devfn,
+					base + 4, val);
+out:
 	mutex_unlock(&nb_smu_ind_mutex);
+	return ret;
 }
 
-static void read_htcreg_nb_f15(struct pci_dev *pdev, u32 *regval)
+static int read_htcreg_nb_f15(struct pci_dev *pdev, u32 *regval)
 {
-	amd_nb_index_read(pdev, PCI_DEVFN(0, 0), 0xb8,
-			  F15H_M60H_HARDWARE_TEMP_CTRL_OFFSET, regval);
+	return amd_nb_index_read(pdev, PCI_DEVFN(0, 0), 0xb8,
+				F15H_M60H_HARDWARE_TEMP_CTRL_OFFSET, regval);
 }
 
-static void read_tempreg_nb_f15(struct pci_dev *pdev, u32 *regval)
+static int read_tempreg_nb_f15(struct pci_dev *pdev, u32 *regval)
 {
-	amd_nb_index_read(pdev, PCI_DEVFN(0, 0), 0xb8,
-			  F15H_M60H_REPORTED_TEMP_CTRL_OFFSET, regval);
+	return amd_nb_index_read(pdev, PCI_DEVFN(0, 0), 0xb8,
+				F15H_M60H_REPORTED_TEMP_CTRL_OFFSET, regval);
 }
 
-static void read_tempreg_nb_zen(struct pci_dev *pdev, u32 *regval)
+static int read_tempreg_nb_zen(struct pci_dev *pdev, u32 *regval)
 {
-	amd_smn_read(amd_pci_dev_to_node_id(pdev),
-		     ZEN_REPORTED_TEMP_CTRL_BASE, regval);
+	return amd_smn_read(amd_pci_dev_to_node_id(pdev),
+			    ZEN_REPORTED_TEMP_CTRL_BASE, regval);
 }
 
-static long get_raw_temp(struct k10temp_data *data)
+static int get_raw_temp(struct k10temp_data *data, long *val)
 {
 	u32 regval;
-	long temp;
+	int ret;
 
-	data->read_tempreg(data->pdev, &regval);
-	temp = (regval >> ZEN_CUR_TEMP_SHIFT) * 125;
+	ret = data->read_tempreg(data->pdev, &regval);
+	if (ret)
+		return ret;
+	*val = (regval >> ZEN_CUR_TEMP_SHIFT) * 125;
 	if (regval & data->temp_adjust_mask)
-		temp -= 49000;
-	return temp;
+		*val -= 49000;
+	if (*val < 0)
+		return -EINVAL;
+	return 0;
 }
 
 static const char *k10temp_temp_label[] = {
@@ -212,24 +222,27 @@ static int k10temp_read_temp(struct device *dev, u32 attr, int channel,
 {
 	struct k10temp_data *data = dev_get_drvdata(dev);
 	u32 regval;
+	int ret;
 
 	switch (attr) {
 	case hwmon_temp_input:
 		switch (channel) {
 		case 0:		/* Tctl */
-			*val = get_raw_temp(data);
-			if (*val < 0)
-				*val = 0;
+			ret = get_raw_temp(data, val);
+			if (ret)
+				return ret;
 			break;
 		case 1:		/* Tdie */
-			*val = get_raw_temp(data) - data->temp_offset;
-			if (*val < 0)
-				*val = 0;
+			ret = get_raw_temp(data, val) - data->temp_offset;
+			if (ret)
+				return ret;
 			break;
 		case 2 ... 9:		/* Tccd{1-8} */
-			amd_smn_read(amd_pci_dev_to_node_id(data->pdev),
+			ret = amd_smn_read(amd_pci_dev_to_node_id(data->pdev),
 				     ZEN_CCD_TEMP(data->ccd_offset, channel - 2),
 						  &regval);
+			if (ret)
+				return ret;
 			*val = (regval & ZEN_CCD_TEMP_MASK) * 125 - 49000;
 			break;
 		default:
@@ -240,11 +253,15 @@ static int k10temp_read_temp(struct device *dev, u32 attr, int channel,
 		*val = 70 * 1000;
 		break;
 	case hwmon_temp_crit:
-		data->read_htcreg(data->pdev, &regval);
+		ret = data->read_htcreg(data->pdev, &regval);
+		if (ret)
+			return ret;
 		*val = ((regval >> 16) & 0x7f) * 500 + 52000;
 		break;
 	case hwmon_temp_crit_hyst:
-		data->read_htcreg(data->pdev, &regval);
+		ret = data->read_htcreg(data->pdev, &regval);
+		if (ret)
+			return ret;
 		*val = (((regval >> 16) & 0x7f)
 			- ((regval >> 24) & 0xf)) * 500 + 52000;
 		break;
-- 
2.25.1

Re: [PATCH v2 3/3] hwmon: (k10temp): Show errors failing to read

[Guenter Roeck]

On Fri, Aug 27, 2021 at 03:15:27PM -0500, Mario Limonciello wrote:
> Enabling Yellow Carp was initially not working "properly"
> because extra IDs were needed, but this wasn't obvious because fail values
> from `amd_smn_read` were ignored.
> 
> Don't discard errors from any functions providing them, instead pass up
> to the caller.
> 
> Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>
> ---
>  drivers/hwmon/k10temp.c | 87 ++++++++++++++++++++++++-----------------
>  1 file changed, 52 insertions(+), 35 deletions(-)
> 
> diff --git a/drivers/hwmon/k10temp.c b/drivers/hwmon/k10temp.c
> index 38bc35ac8135..2edb49d39d22 100644
> --- a/drivers/hwmon/k10temp.c
> +++ b/drivers/hwmon/k10temp.c
> @@ -98,8 +98,8 @@ static DEFINE_MUTEX(nb_smu_ind_mutex);
>  
>  struct k10temp_data {
>  	struct pci_dev *pdev;
> -	void (*read_htcreg)(struct pci_dev *pdev, u32 *regval);
> -	void (*read_tempreg)(struct pci_dev *pdev, u32 *regval);
> +	int (*read_htcreg)(struct pci_dev *pdev, u32 *regval);
> +	int (*read_tempreg)(struct pci_dev *pdev, u32 *regval);
>  	int temp_offset;
>  	u32 temp_adjust_mask;
>  	u32 show_temp;
> @@ -129,55 +129,65 @@ static const struct tctl_offset tctl_offset_table[] = {
>  	{ 0x17, "AMD Ryzen Threadripper 29", 27000 }, /* 29{20,50,70,90}[W]X */
>  };
>  
> -static void read_htcreg_pci(struct pci_dev *pdev, u32 *regval)
> +static int read_htcreg_pci(struct pci_dev *pdev, u32 *regval)
>  {
> -	pci_read_config_dword(pdev, REG_HARDWARE_THERMAL_CONTROL, regval);
> +	return pci_read_config_dword(pdev, REG_HARDWARE_THERMAL_CONTROL, regval);
>  }
>  
> -static void read_tempreg_pci(struct pci_dev *pdev, u32 *regval)
> +static int read_tempreg_pci(struct pci_dev *pdev, u32 *regval)
>  {
> -	pci_read_config_dword(pdev, REG_REPORTED_TEMPERATURE, regval);
> +	return pci_read_config_dword(pdev, REG_REPORTED_TEMPERATURE, regval);
>  }
>  
> -static void amd_nb_index_read(struct pci_dev *pdev, unsigned int devfn,
> +static int amd_nb_index_read(struct pci_dev *pdev, unsigned int devfn,
>  			      unsigned int base, int offset, u32 *val)
>  {
> +	int ret;
> +
>  	mutex_lock(&nb_smu_ind_mutex);
> -	pci_bus_write_config_dword(pdev->bus, devfn,
> -				   base, offset);
> -	pci_bus_read_config_dword(pdev->bus, devfn,
> -				  base + 4, val);
> +	ret = pci_bus_write_config_dword(pdev->bus, devfn,
> +					 base, offset);
> +	if (ret)
> +		goto out;
> +	ret = pci_bus_read_config_dword(pdev->bus, devfn,
> +					base + 4, val);
> +out:
>  	mutex_unlock(&nb_smu_ind_mutex);
> +	return ret;
>  }
>  
> -static void read_htcreg_nb_f15(struct pci_dev *pdev, u32 *regval)
> +static int read_htcreg_nb_f15(struct pci_dev *pdev, u32 *regval)
>  {
> -	amd_nb_index_read(pdev, PCI_DEVFN(0, 0), 0xb8,
> -			  F15H_M60H_HARDWARE_TEMP_CTRL_OFFSET, regval);
> +	return amd_nb_index_read(pdev, PCI_DEVFN(0, 0), 0xb8,
> +				F15H_M60H_HARDWARE_TEMP_CTRL_OFFSET, regval);
>  }
>  
> -static void read_tempreg_nb_f15(struct pci_dev *pdev, u32 *regval)
> +static int read_tempreg_nb_f15(struct pci_dev *pdev, u32 *regval)
>  {
> -	amd_nb_index_read(pdev, PCI_DEVFN(0, 0), 0xb8,
> -			  F15H_M60H_REPORTED_TEMP_CTRL_OFFSET, regval);
> +	return amd_nb_index_read(pdev, PCI_DEVFN(0, 0), 0xb8,
> +				F15H_M60H_REPORTED_TEMP_CTRL_OFFSET, regval);
>  }
>  
> -static void read_tempreg_nb_zen(struct pci_dev *pdev, u32 *regval)
> +static int read_tempreg_nb_zen(struct pci_dev *pdev, u32 *regval)
>  {
> -	amd_smn_read(amd_pci_dev_to_node_id(pdev),
> -		     ZEN_REPORTED_TEMP_CTRL_BASE, regval);
> +	return amd_smn_read(amd_pci_dev_to_node_id(pdev),
> +			    ZEN_REPORTED_TEMP_CTRL_BASE, regval);
>  }
>  
> -static long get_raw_temp(struct k10temp_data *data)
> +static int get_raw_temp(struct k10temp_data *data, long *val)
>  {
>  	u32 regval;
> -	long temp;
> +	int ret;
>  
> -	data->read_tempreg(data->pdev, &regval);
> -	temp = (regval >> ZEN_CUR_TEMP_SHIFT) * 125;
> +	ret = data->read_tempreg(data->pdev, &regval);
> +	if (ret)
> +		return ret;
> +	*val = (regval >> ZEN_CUR_TEMP_SHIFT) * 125;
>  	if (regval & data->temp_adjust_mask)
> -		temp -= 49000;
> -	return temp;
> +		*val -= 49000;
> +	if (*val < 0)
> +		return -EINVAL;

Please don't do that. More on that see below.

> +	return 0;
>  }
>  
>  static const char *k10temp_temp_label[] = {
> @@ -212,24 +222,27 @@ static int k10temp_read_temp(struct device *dev, u32 attr, int channel,
>  {
>  	struct k10temp_data *data = dev_get_drvdata(dev);
>  	u32 regval;
> +	int ret;
>  
>  	switch (attr) {
>  	case hwmon_temp_input:
>  		switch (channel) {
>  		case 0:		/* Tctl */
> -			*val = get_raw_temp(data);
> -			if (*val < 0)
> -				*val = 0;

We have to take the history into account here. A negative value
is not an error per se, but it suggests that the chip returns wrong
data. See commit aef17ca12719 ("hwmon: (k10temp) Only apply temperature
offset if result is positive") for some of the background. I don't really
want to change that into an error return just because we don't know
what the chip is doing. Please retain the above code, either by fixing
the values up here or in get_raw_temp().

Thanks,
Guenter

> +			ret = get_raw_temp(data, val);
> +			if (ret)
> +				return ret;
>  			break;
>  		case 1:		/* Tdie */
> -			*val = get_raw_temp(data) - data->temp_offset;
> -			if (*val < 0)
> -				*val = 0;
> +			ret = get_raw_temp(data, val) - data->temp_offset;
> +			if (ret)
> +				return ret;
>  			break;
>  		case 2 ... 9:		/* Tccd{1-8} */
> -			amd_smn_read(amd_pci_dev_to_node_id(data->pdev),
> +			ret = amd_smn_read(amd_pci_dev_to_node_id(data->pdev),
>  				     ZEN_CCD_TEMP(data->ccd_offset, channel - 2),
>  						  &regval);
> +			if (ret)
> +				return ret;
>  			*val = (regval & ZEN_CCD_TEMP_MASK) * 125 - 49000;
>  			break;
>  		default:
> @@ -240,11 +253,15 @@ static int k10temp_read_temp(struct device *dev, u32 attr, int channel,
>  		*val = 70 * 1000;
>  		break;
>  	case hwmon_temp_crit:
> -		data->read_htcreg(data->pdev, &regval);
> +		ret = data->read_htcreg(data->pdev, &regval);
> +		if (ret)
> +			return ret;
>  		*val = ((regval >> 16) & 0x7f) * 500 + 52000;
>  		break;
>  	case hwmon_temp_crit_hyst:
> -		data->read_htcreg(data->pdev, &regval);
> +		ret = data->read_htcreg(data->pdev, &regval);
> +		if (ret)
> +			return ret;
>  		*val = (((regval >> 16) & 0x7f)
>  			- ((regval >> 24) & 0xf)) * 500 + 52000;
>  		break;

Re: [PATCH v2 3/3] hwmon: (k10temp): Show errors failing to read

[Limonciello, Mario]

On 8/27/2021 16:06, Guenter Roeck wrote:
> On Fri, Aug 27, 2021 at 03:15:27PM -0500, Mario Limonciello wrote:
>> Enabling Yellow Carp was initially not working "properly"
>> because extra IDs were needed, but this wasn't obvious because fail values
>> from `amd_smn_read` were ignored.
>>
>> Don't discard errors from any functions providing them, instead pass up
>> to the caller.
>>
>> Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>
>> ---
>>   drivers/hwmon/k10temp.c | 87 ++++++++++++++++++++++++-----------------
>>   1 file changed, 52 insertions(+), 35 deletions(-)
>>
>> diff --git a/drivers/hwmon/k10temp.c b/drivers/hwmon/k10temp.c
>> index 38bc35ac8135..2edb49d39d22 100644
>> --- a/drivers/hwmon/k10temp.c
>> +++ b/drivers/hwmon/k10temp.c
>> @@ -98,8 +98,8 @@ static DEFINE_MUTEX(nb_smu_ind_mutex);
>>   
>>   struct k10temp_data {
>>   	struct pci_dev *pdev;
>> -	void (*read_htcreg)(struct pci_dev *pdev, u32 *regval);
>> -	void (*read_tempreg)(struct pci_dev *pdev, u32 *regval);
>> +	int (*read_htcreg)(struct pci_dev *pdev, u32 *regval);
>> +	int (*read_tempreg)(struct pci_dev *pdev, u32 *regval);
>>   	int temp_offset;
>>   	u32 temp_adjust_mask;
>>   	u32 show_temp;
>> @@ -129,55 +129,65 @@ static const struct tctl_offset tctl_offset_table[] = {
>>   	{ 0x17, "AMD Ryzen Threadripper 29", 27000 }, /* 29{20,50,70,90}[W]X */
>>   };
>>   
>> -static void read_htcreg_pci(struct pci_dev *pdev, u32 *regval)
>> +static int read_htcreg_pci(struct pci_dev *pdev, u32 *regval)
>>   {
>> -	pci_read_config_dword(pdev, REG_HARDWARE_THERMAL_CONTROL, regval);
>> +	return pci_read_config_dword(pdev, REG_HARDWARE_THERMAL_CONTROL, regval);
>>   }
>>   
>> -static void read_tempreg_pci(struct pci_dev *pdev, u32 *regval)
>> +static int read_tempreg_pci(struct pci_dev *pdev, u32 *regval)
>>   {
>> -	pci_read_config_dword(pdev, REG_REPORTED_TEMPERATURE, regval);
>> +	return pci_read_config_dword(pdev, REG_REPORTED_TEMPERATURE, regval);
>>   }
>>   
>> -static void amd_nb_index_read(struct pci_dev *pdev, unsigned int devfn,
>> +static int amd_nb_index_read(struct pci_dev *pdev, unsigned int devfn,
>>   			      unsigned int base, int offset, u32 *val)
>>   {
>> +	int ret;
>> +
>>   	mutex_lock(&nb_smu_ind_mutex);
>> -	pci_bus_write_config_dword(pdev->bus, devfn,
>> -				   base, offset);
>> -	pci_bus_read_config_dword(pdev->bus, devfn,
>> -				  base + 4, val);
>> +	ret = pci_bus_write_config_dword(pdev->bus, devfn,
>> +					 base, offset);
>> +	if (ret)
>> +		goto out;
>> +	ret = pci_bus_read_config_dword(pdev->bus, devfn,
>> +					base + 4, val);
>> +out:
>>   	mutex_unlock(&nb_smu_ind_mutex);
>> +	return ret;
>>   }
>>   
>> -static void read_htcreg_nb_f15(struct pci_dev *pdev, u32 *regval)
>> +static int read_htcreg_nb_f15(struct pci_dev *pdev, u32 *regval)
>>   {
>> -	amd_nb_index_read(pdev, PCI_DEVFN(0, 0), 0xb8,
>> -			  F15H_M60H_HARDWARE_TEMP_CTRL_OFFSET, regval);
>> +	return amd_nb_index_read(pdev, PCI_DEVFN(0, 0), 0xb8,
>> +				F15H_M60H_HARDWARE_TEMP_CTRL_OFFSET, regval);
>>   }
>>   
>> -static void read_tempreg_nb_f15(struct pci_dev *pdev, u32 *regval)
>> +static int read_tempreg_nb_f15(struct pci_dev *pdev, u32 *regval)
>>   {
>> -	amd_nb_index_read(pdev, PCI_DEVFN(0, 0), 0xb8,
>> -			  F15H_M60H_REPORTED_TEMP_CTRL_OFFSET, regval);
>> +	return amd_nb_index_read(pdev, PCI_DEVFN(0, 0), 0xb8,
>> +				F15H_M60H_REPORTED_TEMP_CTRL_OFFSET, regval);
>>   }
>>   
>> -static void read_tempreg_nb_zen(struct pci_dev *pdev, u32 *regval)
>> +static int read_tempreg_nb_zen(struct pci_dev *pdev, u32 *regval)
>>   {
>> -	amd_smn_read(amd_pci_dev_to_node_id(pdev),
>> -		     ZEN_REPORTED_TEMP_CTRL_BASE, regval);
>> +	return amd_smn_read(amd_pci_dev_to_node_id(pdev),
>> +			    ZEN_REPORTED_TEMP_CTRL_BASE, regval);
>>   }
>>   
>> -static long get_raw_temp(struct k10temp_data *data)
>> +static int get_raw_temp(struct k10temp_data *data, long *val)
>>   {
>>   	u32 regval;
>> -	long temp;
>> +	int ret;
>>   
>> -	data->read_tempreg(data->pdev, &regval);
>> -	temp = (regval >> ZEN_CUR_TEMP_SHIFT) * 125;
>> +	ret = data->read_tempreg(data->pdev, &regval);
>> +	if (ret)
>> +		return ret;
>> +	*val = (regval >> ZEN_CUR_TEMP_SHIFT) * 125;
>>   	if (regval & data->temp_adjust_mask)
>> -		temp -= 49000;
>> -	return temp;
>> +		*val -= 49000;
>> +	if (*val < 0)
>> +		return -EINVAL;
> 
> Please don't do that. More on that see below.
> 
>> +	return 0;
>>   }
>>   
>>   static const char *k10temp_temp_label[] = {
>> @@ -212,24 +222,27 @@ static int k10temp_read_temp(struct device *dev, u32 attr, int channel,
>>   {
>>   	struct k10temp_data *data = dev_get_drvdata(dev);
>>   	u32 regval;
>> +	int ret;
>>   
>>   	switch (attr) {
>>   	case hwmon_temp_input:
>>   		switch (channel) {
>>   		case 0:		/* Tctl */
>> -			*val = get_raw_temp(data);
>> -			if (*val < 0)
>> -				*val = 0;
> 
> We have to take the history into account here. A negative value
> is not an error per se, but it suggests that the chip returns wrong
> data. See commit aef17ca12719 ("hwmon: (k10temp) Only apply temperature
> offset if result is positive") for some of the background. I don't really
> want to change that into an error return just because we don't know
> what the chip is doing. Please retain the above code, either by fixing
> the values up here or in get_raw_temp().

Actually I thought what I was doing *was* making it a lot less ambiguous.

The caller getting -EINVAL from get_raw_tempt will indicate that the 
data shouldn't be trusted rather than a surely wrong "0".

> 
> Thanks,
> Guenter
> 
>> +			ret = get_raw_temp(data, val);
>> +			if (ret)
>> +				return ret;
>>   			break;
>>   		case 1:		/* Tdie */
>> -			*val = get_raw_temp(data) - data->temp_offset;
>> -			if (*val < 0)
>> -				*val = 0;
>> +			ret = get_raw_temp(data, val) - data->temp_offset;
>> +			if (ret)
>> +				return ret;
>>   			break;
>>   		case 2 ... 9:		/* Tccd{1-8} */
>> -			amd_smn_read(amd_pci_dev_to_node_id(data->pdev),
>> +			ret = amd_smn_read(amd_pci_dev_to_node_id(data->pdev),
>>   				     ZEN_CCD_TEMP(data->ccd_offset, channel - 2),
>>   						  &regval);
>> +			if (ret)
>> +				return ret;
>>   			*val = (regval & ZEN_CCD_TEMP_MASK) * 125 - 49000;
>>   			break;
>>   		default:
>> @@ -240,11 +253,15 @@ static int k10temp_read_temp(struct device *dev, u32 attr, int channel,
>>   		*val = 70 * 1000;
>>   		break;
>>   	case hwmon_temp_crit:
>> -		data->read_htcreg(data->pdev, &regval);
>> +		ret = data->read_htcreg(data->pdev, &regval);
>> +		if (ret)
>> +			return ret;
>>   		*val = ((regval >> 16) & 0x7f) * 500 + 52000;
>>   		break;
>>   	case hwmon_temp_crit_hyst:
>> -		data->read_htcreg(data->pdev, &regval);
>> +		ret = data->read_htcreg(data->pdev, &regval);
>> +		if (ret)
>> +			return ret;
>>   		*val = (((regval >> 16) & 0x7f)
>>   			- ((regval >> 24) & 0xf)) * 500 + 52000;
>>   		break;

Re: [PATCH v2 3/3] hwmon: (k10temp): Show errors failing to read

[Guenter Roeck]

On 8/27/21 2:10 PM, Limonciello, Mario wrote:
> On 8/27/2021 16:06, Guenter Roeck wrote:
>> On Fri, Aug 27, 2021 at 03:15:27PM -0500, Mario Limonciello wrote:
>>> Enabling Yellow Carp was initially not working "properly"
>>> because extra IDs were needed, but this wasn't obvious because fail values
>>> from `amd_smn_read` were ignored.
>>>
>>> Don't discard errors from any functions providing them, instead pass up
>>> to the caller.
>>>
>>> Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>
>>> ---
>>>   drivers/hwmon/k10temp.c | 87 ++++++++++++++++++++++++-----------------
>>>   1 file changed, 52 insertions(+), 35 deletions(-)
>>>
>>> diff --git a/drivers/hwmon/k10temp.c b/drivers/hwmon/k10temp.c
>>> index 38bc35ac8135..2edb49d39d22 100644
>>> --- a/drivers/hwmon/k10temp.c
>>> +++ b/drivers/hwmon/k10temp.c
>>> @@ -98,8 +98,8 @@ static DEFINE_MUTEX(nb_smu_ind_mutex);
>>>   struct k10temp_data {
>>>       struct pci_dev *pdev;
>>> -    void (*read_htcreg)(struct pci_dev *pdev, u32 *regval);
>>> -    void (*read_tempreg)(struct pci_dev *pdev, u32 *regval);
>>> +    int (*read_htcreg)(struct pci_dev *pdev, u32 *regval);
>>> +    int (*read_tempreg)(struct pci_dev *pdev, u32 *regval);
>>>       int temp_offset;
>>>       u32 temp_adjust_mask;
>>>       u32 show_temp;
>>> @@ -129,55 +129,65 @@ static const struct tctl_offset tctl_offset_table[] = {
>>>       { 0x17, "AMD Ryzen Threadripper 29", 27000 }, /* 29{20,50,70,90}[W]X */
>>>   };
>>> -static void read_htcreg_pci(struct pci_dev *pdev, u32 *regval)
>>> +static int read_htcreg_pci(struct pci_dev *pdev, u32 *regval)
>>>   {
>>> -    pci_read_config_dword(pdev, REG_HARDWARE_THERMAL_CONTROL, regval);
>>> +    return pci_read_config_dword(pdev, REG_HARDWARE_THERMAL_CONTROL, regval);
>>>   }
>>> -static void read_tempreg_pci(struct pci_dev *pdev, u32 *regval)
>>> +static int read_tempreg_pci(struct pci_dev *pdev, u32 *regval)
>>>   {
>>> -    pci_read_config_dword(pdev, REG_REPORTED_TEMPERATURE, regval);
>>> +    return pci_read_config_dword(pdev, REG_REPORTED_TEMPERATURE, regval);
>>>   }
>>> -static void amd_nb_index_read(struct pci_dev *pdev, unsigned int devfn,
>>> +static int amd_nb_index_read(struct pci_dev *pdev, unsigned int devfn,
>>>                     unsigned int base, int offset, u32 *val)
>>>   {
>>> +    int ret;
>>> +
>>>       mutex_lock(&nb_smu_ind_mutex);
>>> -    pci_bus_write_config_dword(pdev->bus, devfn,
>>> -                   base, offset);
>>> -    pci_bus_read_config_dword(pdev->bus, devfn,
>>> -                  base + 4, val);
>>> +    ret = pci_bus_write_config_dword(pdev->bus, devfn,
>>> +                     base, offset);
>>> +    if (ret)
>>> +        goto out;
>>> +    ret = pci_bus_read_config_dword(pdev->bus, devfn,
>>> +                    base + 4, val);
>>> +out:
>>>       mutex_unlock(&nb_smu_ind_mutex);
>>> +    return ret;
>>>   }
>>> -static void read_htcreg_nb_f15(struct pci_dev *pdev, u32 *regval)
>>> +static int read_htcreg_nb_f15(struct pci_dev *pdev, u32 *regval)
>>>   {
>>> -    amd_nb_index_read(pdev, PCI_DEVFN(0, 0), 0xb8,
>>> -              F15H_M60H_HARDWARE_TEMP_CTRL_OFFSET, regval);
>>> +    return amd_nb_index_read(pdev, PCI_DEVFN(0, 0), 0xb8,
>>> +                F15H_M60H_HARDWARE_TEMP_CTRL_OFFSET, regval);
>>>   }
>>> -static void read_tempreg_nb_f15(struct pci_dev *pdev, u32 *regval)
>>> +static int read_tempreg_nb_f15(struct pci_dev *pdev, u32 *regval)
>>>   {
>>> -    amd_nb_index_read(pdev, PCI_DEVFN(0, 0), 0xb8,
>>> -              F15H_M60H_REPORTED_TEMP_CTRL_OFFSET, regval);
>>> +    return amd_nb_index_read(pdev, PCI_DEVFN(0, 0), 0xb8,
>>> +                F15H_M60H_REPORTED_TEMP_CTRL_OFFSET, regval);
>>>   }
>>> -static void read_tempreg_nb_zen(struct pci_dev *pdev, u32 *regval)
>>> +static int read_tempreg_nb_zen(struct pci_dev *pdev, u32 *regval)
>>>   {
>>> -    amd_smn_read(amd_pci_dev_to_node_id(pdev),
>>> -             ZEN_REPORTED_TEMP_CTRL_BASE, regval);
>>> +    return amd_smn_read(amd_pci_dev_to_node_id(pdev),
>>> +                ZEN_REPORTED_TEMP_CTRL_BASE, regval);
>>>   }
>>> -static long get_raw_temp(struct k10temp_data *data)
>>> +static int get_raw_temp(struct k10temp_data *data, long *val)
>>>   {
>>>       u32 regval;
>>> -    long temp;
>>> +    int ret;
>>> -    data->read_tempreg(data->pdev, &regval);
>>> -    temp = (regval >> ZEN_CUR_TEMP_SHIFT) * 125;
>>> +    ret = data->read_tempreg(data->pdev, &regval);
>>> +    if (ret)
>>> +        return ret;
>>> +    *val = (regval >> ZEN_CUR_TEMP_SHIFT) * 125;
>>>       if (regval & data->temp_adjust_mask)
>>> -        temp -= 49000;
>>> -    return temp;
>>> +        *val -= 49000;
>>> +    if (*val < 0)
>>> +        return -EINVAL;
>>
>> Please don't do that. More on that see below.
>>
>>> +    return 0;
>>>   }
>>>   static const char *k10temp_temp_label[] = {
>>> @@ -212,24 +222,27 @@ static int k10temp_read_temp(struct device *dev, u32 attr, int channel,
>>>   {
>>>       struct k10temp_data *data = dev_get_drvdata(dev);
>>>       u32 regval;
>>> +    int ret;
>>>       switch (attr) {
>>>       case hwmon_temp_input:
>>>           switch (channel) {
>>>           case 0:        /* Tctl */
>>> -            *val = get_raw_temp(data);
>>> -            if (*val < 0)
>>> -                *val = 0;
>>
>> We have to take the history into account here. A negative value
>> is not an error per se, but it suggests that the chip returns wrong
>> data. See commit aef17ca12719 ("hwmon: (k10temp) Only apply temperature
>> offset if result is positive") for some of the background. I don't really
>> want to change that into an error return just because we don't know
>> what the chip is doing. Please retain the above code, either by fixing
>> the values up here or in get_raw_temp().
> 
> Actually I thought what I was doing *was* making it a lot less ambiguous.
> 
> The caller getting -EINVAL from get_raw_tempt will indicate that the data shouldn't be trusted rather than a surely wrong "0".
> 

First, EINVAL is "Invalid argument" and thus most definitely the wrong
error.

Second, this is a logically different change and violates "one logical
change per patch". You can try to argue this in a separate patch,
but do not try sneak it in with an unrelated change.

Plus, of course, I'd rather get code from AMD that does the right thing
and reports the correct temperature in the observed situation.

Thanks,
Guenter