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author | Shyam Sundar S K <Shyam-sundar.S-k@amd.com> | 2023-12-12 04:46:55 +0300 |
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committer | Hans de Goede <hdegoede@redhat.com> | 2023-12-18 14:47:45 +0300 |
commit | ae82cef7d9c53cad0852d2d79d430b210432a025 (patch) | |
tree | 2c96ced67c5d9c926dc9f998c88174dcf93911cb /drivers/platform/x86/amd/pmf/tee-if.c | |
parent | ac052d8c08f9da225bea09c7e71527831368462b (diff) | |
download | linux-ae82cef7d9c53cad0852d2d79d430b210432a025.tar.xz |
platform/x86/amd/pmf: Add support for PMF-TA interaction
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@amd.com>
Signed-off-by: Shyam Sundar S K <Shyam-sundar.S-k@amd.com>
Link: https://lore.kernel.org/r/20231212014705.2017474-3-Shyam-sundar.S-k@amd.com
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Diffstat (limited to 'drivers/platform/x86/amd/pmf/tee-if.c')
-rw-r--r-- | drivers/platform/x86/amd/pmf/tee-if.c | 97 |
1 files changed, 96 insertions, 1 deletions
diff --git a/drivers/platform/x86/amd/pmf/tee-if.c b/drivers/platform/x86/amd/pmf/tee-if.c index 6ec8c3726624..4036f435f1e2 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 = MSEC_PER_SEC; +#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 + static const uuid_t amd_pmf_ta_uuid = UUID_INIT(0x6fd93b77, 0x3fb8, 0x524d, 0xb1, 0x2d, 0xc5, 0x29, 0xb1, 0x3d, 0x85, 0x43); +static void amd_pmf_prepare_args(struct amd_pmf_dev *dev, int cmd, + struct tee_ioctl_invoke_arg *arg, + struct tee_param *param) +{ + memset(arg, 0, sizeof(*arg)); + memset(param, 0, MAX_TEE_PARAM * sizeof(*param)); + + arg->func = cmd; + arg->session = dev->session_id; + arg->num_params = MAX_TEE_PARAM; + + /* Fill invoke cmd params */ + param[0].u.memref.size = sizeof(struct ta_pmf_shared_memory); + param[0].attr = TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_INOUT; + param[0].u.memref.shm = dev->fw_shm_pool; + param[0].u.memref.shm_offs = 0; +} + +static int amd_pmf_invoke_cmd_enact(struct amd_pmf_dev *dev) +{ + struct ta_pmf_shared_memory *ta_sm = NULL; + struct tee_param param[MAX_TEE_PARAM]; + struct tee_ioctl_invoke_arg arg; + int ret = 0; + + if (!dev->tee_ctx) + return -ENODEV; + + ta_sm = dev->shbuf; + memset(ta_sm, 0, sizeof(*ta_sm)); + ta_sm->command_id = TA_PMF_COMMAND_POLICY_BUILDER_ENACT_POLICIES; + ta_sm->if_version = PMF_TA_IF_VERSION_MAJOR; + + amd_pmf_prepare_args(dev, TA_PMF_COMMAND_POLICY_BUILDER_ENACT_POLICIES, &arg, param); + + ret = tee_client_invoke_func(dev->tee_ctx, &arg, param); + if (ret < 0 || arg.ret != 0) { + dev_err(dev->dev, "TEE enact cmd failed. err: %x, ret:%d\n", arg.ret, ret); + return ret; + } + + return 0; +} + +static int amd_pmf_invoke_cmd_init(struct amd_pmf_dev *dev) +{ + struct ta_pmf_shared_memory *ta_sm = NULL; + struct tee_param param[MAX_TEE_PARAM]; + struct tee_ioctl_invoke_arg arg; + int ret = 0; + + if (!dev->tee_ctx) { + dev_err(dev->dev, "Failed to get TEE context\n"); + return -ENODEV; + } + + ta_sm = dev->shbuf; + ta_sm->command_id = TA_PMF_COMMAND_POLICY_BUILDER_INITIALIZE; + ta_sm->if_version = PMF_TA_IF_VERSION_MAJOR; + + amd_pmf_prepare_args(dev, TA_PMF_COMMAND_POLICY_BUILDER_INITIALIZE, &arg, param); + + ret = tee_client_invoke_func(dev->tee_ctx, &arg, param); + if (ret < 0 || arg.ret != 0) { + dev_err(dev->dev, "Failed to invoke TEE init cmd. err: %x, ret:%d\n", arg.ret, ret); + return ret; + } + + return ta_sm->pmf_result; +} + +static void amd_pmf_invoke_cmd(struct work_struct *work) +{ + struct amd_pmf_dev *dev = container_of(work, struct amd_pmf_dev, pb_work.work); + + amd_pmf_invoke_cmd_enact(dev); + schedule_delayed_work(&dev->pb_work, msecs_to_jiffies(pb_actions_ms)); +} + static int amd_pmf_amdtee_ta_match(struct tee_ioctl_version_data *ver, const void *data) { return ver->impl_id == TEE_IMPL_ID_AMDTEE; @@ -96,10 +183,18 @@ static void amd_pmf_tee_deinit(struct amd_pmf_dev *dev) int amd_pmf_init_smart_pc(struct amd_pmf_dev *dev) { - return amd_pmf_tee_init(dev); + int ret; + + ret = amd_pmf_tee_init(dev); + if (ret) + return ret; + + INIT_DELAYED_WORK(&dev->pb_work, amd_pmf_invoke_cmd); + return 0; } void amd_pmf_deinit_smart_pc(struct amd_pmf_dev *dev) { + cancel_delayed_work_sync(&dev->pb_work); amd_pmf_tee_deinit(dev); } |