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At times it becomes difficult to debug when the policies inside the policy binaries starts to misbehave. Add a way to sideload such policies independently to debug them via a debugfs entry. Reviewed-by: Mario Limonciello Signed-off-by: Shyam Sundar S K --- drivers/platform/x86/amd/pmf/pmf.h | 1 + drivers/platform/x86/amd/pmf/tee-if.c | 60 +++++++++++++++++++++++++++ 2 files changed, 61 insertions(+) diff --git a/drivers/platform/x86/amd/pmf/pmf.h b/drivers/platform/x86/amd/pmf/pmf.h index 61a0f3225b62..780c442239e3 100644 --- a/drivers/platform/x86/amd/pmf/pmf.h +++ b/drivers/platform/x86/amd/pmf/pmf.h @@ -215,6 +215,7 @@ struct amd_pmf_dev { bool cnqf_supported; struct notifier_block pwr_src_notifier; /* Smart PC solution builder */ + struct dentry *esbin; unsigned char *policy_buf; u32 policy_sz; struct tee_context *tee_ctx; diff --git a/drivers/platform/x86/amd/pmf/tee-if.c b/drivers/platform/x86/amd/pmf/tee-if.c index 4844782d93c7..fa37cfab2dc7 100644 --- a/drivers/platform/x86/amd/pmf/tee-if.c +++ b/drivers/platform/x86/amd/pmf/tee-if.c @@ -8,6 +8,7 @@ * Author: Shyam Sundar S K */ +#include #include #include #include "pmf.h" @@ -21,6 +22,13 @@ module_param(pb_actions_ms, int, 0644); MODULE_PARM_DESC(pb_actions_ms, "Policy binary actions sampling frequency (default = 1000ms)"); #endif +#ifdef CONFIG_AMD_PMF_DEBUG +/* Sideload policy binaries to debug policy failures */ +static bool pb_side_load; +module_param(pb_side_load, bool, 0444); +MODULE_PARM_DESC(pb_side_load, "Sideload policy binaries debug policy failures"); +#endif + static const uuid_t amd_pmf_ta_uuid = UUID_INIT(0x6fd93b77, 0x3fb8, 0x524d, 0xb1, 0x2d, 0xc5, 0x29, 0xb1, 0x3d, 0x85, 0x43); @@ -267,6 +275,49 @@ static int amd_pmf_start_policy_engine(struct amd_pmf_dev *dev) return 0; } +#ifdef CONFIG_AMD_PMF_DEBUG +static ssize_t amd_pmf_get_pb_data(struct file *filp, const char __user *buf, + size_t length, loff_t *pos) +{ + struct amd_pmf_dev *dev = filp->private_data; + int ret; + + /* policy binary size cannot exceed POLICY_BUF_MAX_SZ */ + if (length > POLICY_BUF_MAX_SZ || length == 0) + return -EINVAL; + + dev->policy_sz = length; + if (copy_from_user(dev->policy_buf, buf, dev->policy_sz)) + return -EFAULT; + + ret = amd_pmf_start_policy_engine(dev); + if (ret) + return -EINVAL; + + return length; +} + +static const struct file_operations pb_fops = { + .write = amd_pmf_get_pb_data, + .open = simple_open, +}; + +int amd_pmf_open_pb(struct amd_pmf_dev *dev, struct dentry *debugfs_root) +{ + struct dentry *file = NULL; + + dev->esbin = debugfs_create_dir("pb", debugfs_root); + if (IS_ERR(dev->esbin)) + return -EINVAL; + + file = debugfs_create_file("update_policy", 0644, dev->esbin, dev, &pb_fops); + if (!file) + return -EINVAL; + + return 0; +} +#endif + static int amd_pmf_get_bios_buffer(struct amd_pmf_dev *dev) { dev->policy_buf = kzalloc(dev->policy_sz, GFP_KERNEL); @@ -279,6 +330,11 @@ static int amd_pmf_get_bios_buffer(struct amd_pmf_dev *dev) memcpy(dev->policy_buf, dev->policy_base, dev->policy_sz); +#ifdef CONFIG_AMD_PMF_DEBUG + if (pb_side_load) + amd_pmf_open_pb(dev, dev->dbgfs_dir); +#endif + return amd_pmf_start_policy_engine(dev); } @@ -381,6 +437,10 @@ int amd_pmf_init_smart_pc(struct amd_pmf_dev *dev) void amd_pmf_deinit_smart_pc(struct amd_pmf_dev *dev) { +#ifdef CONFIG_AMD_PMF_DEBUG + if (pb_side_load) + debugfs_remove_recursive(dev->esbin); +#endif kfree(dev->prev_data); kfree(dev->policy_buf); cancel_delayed_work_sync(&dev->pb_work);