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| author | David E. Box <david.e.box@linux.intel.com> | 2024-04-11 05:58:51 +0300 |
|---|---|---|
| committer | Hans de Goede <hdegoede@redhat.com> | 2024-04-15 17:05:59 +0300 |
| commit | 46b5e5eb1d41175bcf360d32f7b30f48cdbf99dc (patch) | |
| tree | 9c648c1eabe9170e6101a3a1aa193a87924ece0b /drivers/platform/x86/intel | |
| parent | d9a4b2aaec4c6f6c9ba1a956d0cf118e439e941c (diff) | |
| download | linux-46b5e5eb1d41175bcf360d32f7b30f48cdbf99dc.tar.xz | |
platform/x86/intel/sdsi: Add attribute to read the current meter state
The meter_certificate file provides access to metering information that may
be attested but is only updated every 8 hours. Add new attribute,
meter_current, to allow reading an untested snapshot of the current values.
Signed-off-by: David E. Box <david.e.box@linux.intel.com>
Reviewed-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com>
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Link: https://lore.kernel.org/r/20240411025856.2782476-5-david.e.box@linux.intel.com
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Diffstat (limited to 'drivers/platform/x86/intel')
| -rw-r--r-- | drivers/platform/x86/intel/sdsi.c | 30 |
1 files changed, 24 insertions, 6 deletions
diff --git a/drivers/platform/x86/intel/sdsi.c b/drivers/platform/x86/intel/sdsi.c index bb3eaf5eb382..277e4f4b20ac 100644 --- a/drivers/platform/x86/intel/sdsi.c +++ b/drivers/platform/x86/intel/sdsi.c @@ -68,6 +68,7 @@ #define CTRL_COMPLETE BIT(6) #define CTRL_READY BIT(7) #define CTRL_INBAND_LOCK BIT(32) +#define CTRL_METER_ENABLE_DRAM BIT(33) #define CTRL_STATUS GENMASK(15, 8) #define CTRL_PACKET_SIZE GENMASK(31, 16) #define CTRL_MSG_SIZE GENMASK(63, 48) @@ -95,6 +96,7 @@ enum sdsi_command { struct sdsi_mbox_info { u64 *payload; void *buffer; + u64 control_flags; int size; }; @@ -250,7 +252,8 @@ static int sdsi_mbox_cmd_read(struct sdsi_priv *priv, struct sdsi_mbox_info *inf control = FIELD_PREP(CTRL_EOM, 1) | FIELD_PREP(CTRL_SOM, 1) | FIELD_PREP(CTRL_RUN_BUSY, 1) | - FIELD_PREP(CTRL_PACKET_SIZE, info->size); + FIELD_PREP(CTRL_PACKET_SIZE, info->size) | + info->control_flags; writeq(control, priv->control_addr); return sdsi_mbox_poll(priv, info, data_size); @@ -424,8 +427,8 @@ static ssize_t provision_cap_write(struct file *filp, struct kobject *kobj, static BIN_ATTR_WO(provision_cap, SDSI_SIZE_WRITE_MSG); static ssize_t -certificate_read(u64 command, struct sdsi_priv *priv, char *buf, loff_t off, - size_t count) +certificate_read(u64 command, u64 control_flags, struct sdsi_priv *priv, + char *buf, loff_t off, size_t count) { struct sdsi_mbox_info info = {}; size_t size; @@ -441,6 +444,7 @@ certificate_read(u64 command, struct sdsi_priv *priv, char *buf, loff_t off, info.payload = &command; info.size = sizeof(command); + info.control_flags = control_flags; ret = mutex_lock_interruptible(&priv->mb_lock); if (ret) @@ -472,7 +476,7 @@ state_certificate_read(struct file *filp, struct kobject *kobj, struct device *dev = kobj_to_dev(kobj); struct sdsi_priv *priv = dev_get_drvdata(dev); - return certificate_read(SDSI_CMD_READ_STATE, priv, buf, off, count); + return certificate_read(SDSI_CMD_READ_STATE, 0, priv, buf, off, count); } static BIN_ATTR_ADMIN_RO(state_certificate, SDSI_SIZE_READ_MSG); @@ -484,10 +488,23 @@ meter_certificate_read(struct file *filp, struct kobject *kobj, struct device *dev = kobj_to_dev(kobj); struct sdsi_priv *priv = dev_get_drvdata(dev); - return certificate_read(SDSI_CMD_READ_METER, priv, buf, off, count); + return certificate_read(SDSI_CMD_READ_METER, 0, priv, buf, off, count); } static BIN_ATTR_ADMIN_RO(meter_certificate, SDSI_SIZE_READ_MSG); +static ssize_t +meter_current_read(struct file *filp, struct kobject *kobj, + struct bin_attribute *attr, char *buf, loff_t off, + size_t count) +{ + struct device *dev = kobj_to_dev(kobj); + struct sdsi_priv *priv = dev_get_drvdata(dev); + + return certificate_read(SDSI_CMD_READ_METER, CTRL_METER_ENABLE_DRAM, + priv, buf, off, count); +} +static BIN_ATTR_ADMIN_RO(meter_current, SDSI_SIZE_READ_MSG); + static ssize_t registers_read(struct file *filp, struct kobject *kobj, struct bin_attribute *attr, char *buf, loff_t off, size_t count) @@ -518,6 +535,7 @@ static struct bin_attribute *sdsi_bin_attrs[] = { &bin_attr_registers, &bin_attr_state_certificate, &bin_attr_meter_certificate, + &bin_attr_meter_current, &bin_attr_provision_akc, &bin_attr_provision_cap, NULL @@ -537,7 +555,7 @@ sdsi_battr_is_visible(struct kobject *kobj, struct bin_attribute *attr, int n) if (!(priv->features & SDSI_FEATURE_SDSI)) return 0; - if (attr == &bin_attr_meter_certificate) + if (attr == &bin_attr_meter_certificate || attr == &bin_attr_meter_current) return (priv->features & SDSI_FEATURE_METERING) ? attr->attr.mode : 0; |