On Sat, 30 Sep 2023, Shyam Sundar S K wrote:
> PMF TA (Trusted Application) loads via the TEE environment into the
> AMD ASP.
>
> PMF-TA supports two commands:
> 1) Init: Initialize the TA with the PMF Smart PC policy binary and
> start the policy engine. A policy is a combination of inputs and
> outputs, where;
> - the inputs are the changing dynamics of the system like the user
> behaviour, system heuristics etc.
> - the outputs, which are the actions to be set on the system which
> lead to better power management and enhanced user experience.
>
> PMF driver acts as a central manager in this case to supply the
> inputs required to the TA (either by getting the information from
> the other kernel subsystems or from userland)
>
> 2) Enact: Enact the output actions from the TA. The action could be
> applying a new thermal limit to boost/throttle the power limits or
> change system behavior.
>
> Reviewed-by: Mario Limonciello <mario.limonciello@xxxxxxx>
> Signed-off-by: Shyam Sundar S K <Shyam-sundar.S-k@xxxxxxx>
> ---
> drivers/platform/x86/amd/pmf/pmf.h | 10 +++
> drivers/platform/x86/amd/pmf/tee-if.c | 97 ++++++++++++++++++++++++++-
> 2 files changed, 106 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/platform/x86/amd/pmf/pmf.h b/drivers/platform/x86/amd/pmf/pmf.h
> index 02460c2a31ea..e0837799f521 100644
> --- a/drivers/platform/x86/amd/pmf/pmf.h
> +++ b/drivers/platform/x86/amd/pmf/pmf.h
> @@ -59,6 +59,9 @@
> #define ARG_NONE 0
> #define AVG_SAMPLE_SIZE 3
>
> +/* TA macros */
> +#define PMF_TA_IF_VERSION_MAJOR 1
> +
> /* AMD PMF BIOS interfaces */
> struct apmf_verify_interface {
> u16 size;
> @@ -184,6 +187,7 @@ struct amd_pmf_dev {
> struct tee_shm *fw_shm_pool;
> u32 session_id;
> void *shbuf;
> + struct delayed_work pb_work;
> bool smart_pc_enabled;
> };
>
> @@ -395,6 +399,12 @@ struct apmf_dyn_slider_output {
> struct apmf_cnqf_power_set ps[APMF_CNQF_MAX];
> } __packed;
>
> +/* cmd ids for TA communication */
> +enum ta_pmf_command {
> + TA_PMF_COMMAND_POLICY_BUILDER_INITIALIZE,
> + TA_PMF_COMMAND_POLICY_BUILDER_ENACT_POLICIES,
> +};
> +
> struct ta_pmf_shared_memory {
> int command_id;
> int resp_id;
> diff --git a/drivers/platform/x86/amd/pmf/tee-if.c b/drivers/platform/x86/amd/pmf/tee-if.c
> index 4db80ca59a11..1b3985cd7c08 100644
> --- a/drivers/platform/x86/amd/pmf/tee-if.c
> +++ b/drivers/platform/x86/amd/pmf/tee-if.c
> @@ -13,9 +13,96 @@
> #include "pmf.h"
>
> #define MAX_TEE_PARAM 4
> +
> +/* Policy binary actions sampling frequency (in ms) */
> +static int pb_actions_ms = 1000;
MSEC_PER_SEC (from #include <linux/time.h>, don't include the vdso one).
> +#ifdef CONFIG_AMD_PMF_DEBUG
> +module_param(pb_actions_ms, int, 0644);
> +MODULE_PARM_DESC(pb_actions_ms, "Policy binary actions sampling frequency (default = 1000ms)");
> +#endif
--
i.
