diff options
| author | Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com> | 2023-10-09 22:05:35 +0300 |
|---|---|---|
| committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2023-10-12 22:09:48 +0300 |
| commit | b473d6a9d68f5bc27c7e35f5c98172d5f2206039 (patch) | |
| tree | 0f97382405451355c61989e1fc0071ea84f5500a /drivers/thermal/intel/int340x_thermal/processor_thermal_device.h | |
| parent | 6ebc25d8b053a208786295bab58abbb66b39c318 (diff) | |
| download | linux-b473d6a9d68f5bc27c7e35f5c98172d5f2206039.tar.xz | |
thermal: int340x: processor_thermal: Support power floor notifications
When the hardware reduces the power to the minimum possible, the power
floor is notified via an interrupt.
This can happen when user space requests a power limit via powercap RAPL
interface, which forces the system to enter to the lowest power. This
power floor indication can be used as a hint to resort to other methods
of reducing power than via RAPL power limit.
Before power floor status can be read or the firmware can trigger
notifications regarding it, it needs to be configured via a mailbox
command. The actual power floor status is read via bit 39 of MMIO
offset 0x5B18 of the processor thermal PCI device.
To show the current power floor status and get notification
on a sysfs attribute, add 2 new attributes to
/sys/bus/pci/devices/0000\:00\:04.0/power_limits/
power_floor_enable : This attribute is present when power floor
notifications are supported. This attribute allows to enable/disable
power floor notifications.
power_floor_status : This attribute is present when power floor
notifications are supported. When enabled via power_floor_enable, this
attribute shows the current power floor status.
The power floor implementation provides interfaces which are called
from the sysfs callbacks to enable/disable and read power floor
status. It also provides two additional interfaces to check if the
current processor thermal device interrupt is for power floor status
and to send notifications to user space.
Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
[ rjw: Changelog and documentation changes edits ]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'drivers/thermal/intel/int340x_thermal/processor_thermal_device.h')
| -rw-r--r-- | drivers/thermal/intel/int340x_thermal/processor_thermal_device.h | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/drivers/thermal/intel/int340x_thermal/processor_thermal_device.h b/drivers/thermal/intel/int340x_thermal/processor_thermal_device.h index f9a381b3e55c..95c6013a33fb 100644 --- a/drivers/thermal/intel/int340x_thermal/processor_thermal_device.h +++ b/drivers/thermal/intel/int340x_thermal/processor_thermal_device.h @@ -63,6 +63,7 @@ struct rapl_mmio_regs { #define PROC_THERMAL_FEATURE_WT_REQ 0x08 #define PROC_THERMAL_FEATURE_DLVR 0x10 #define PROC_THERMAL_FEATURE_WT_HINT 0x20 +#define PROC_THERMAL_FEATURE_POWER_FLOOR 0x40 #if IS_ENABLED(CONFIG_PROC_THERMAL_MMIO_RAPL) int proc_thermal_rapl_add(struct pci_dev *pdev, struct proc_thermal_device *proc_priv); @@ -94,6 +95,13 @@ void proc_thermal_wt_req_remove(struct pci_dev *pdev); #define SOC_WT_RES_INT_STATUS_OFFSET 0x5B18 #define SOC_WT_RES_INT_STATUS_MASK GENMASK_ULL(3, 2) +int proc_thermal_read_power_floor_status(struct proc_thermal_device *proc_priv); +int proc_thermal_power_floor_set_state(struct proc_thermal_device *proc_priv, bool enable); +bool proc_thermal_power_floor_get_state(struct proc_thermal_device *proc_priv); +void proc_thermal_power_floor_intr_callback(struct pci_dev *pdev, + struct proc_thermal_device *proc_priv); +bool proc_thermal_check_power_floor_intr(struct proc_thermal_device *proc_priv); + int processor_thermal_send_mbox_read_cmd(struct pci_dev *pdev, u16 id, u64 *resp); int processor_thermal_send_mbox_write_cmd(struct pci_dev *pdev, u16 id, u32 data); int processor_thermal_mbox_interrupt_config(struct pci_dev *pdev, bool enable, int enable_bit, |