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platform/x86/intel/sdsi: Add meter certificate support 

Add support for reading the meter certificate from Intel On Demand
hardware.  The meter certificate [1] is used to access the utilization
metrics of enabled features in support of the Intel On Demand consumption
model. Similar to the state certificate, the meter certificate is read by
mailbox command.

While making similar changes also use the BIN_ATTR_ADMIN_RO helper to
create the 'registers' sysfs file.

Link: https://github.com/intel-sandbox/debox1.intel_sdsi/blob/gnr-review/meter-certificate.rst [1]
Signed-off-by: David E. Box <david.e.box@linux.intel.com>
Link: https://lore.kernel.org/r/20221119002343.1281885-5-david.e.box@linux.intel.com
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
This commit is contained in:
David E. Box 2022-11-18 16:23:38 -08:00 committed by Hans de Goede
parent 25612c0fb2
commit a96f1b9c48
2 changed files with 48 additions and 11 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
Documentation/ABI/testing/sysfs-driver-intel_sdsi
View File

@ -69,6 +69,16 @@ Description:
the CPU configuration is updated. A cold reboot is required to
fully activate the feature. Mailbox command.
What: /sys/bus/auxiliary/devices/intel_vsec.sdsi.X/meter_certificate
Date: Nov 2022
KernelVersion: 6.2
Contact: "David E. Box" <david.e.box@linux.intel.com>
Description:
(RO) Used to read back the current meter certificate for the CPU
from Intel On Demand hardware. The meter certificate contains
utilization metrics of On Demand enabled features. Mailbox
command.
What: /sys/bus/auxiliary/devices/intel_vsec.sdsi.X/state_certificate
Date: Feb 2022
KernelVersion: 5.18

49
drivers/platform/x86/intel/sdsi.c
View File

@ -41,6 +41,7 @@
#define SDSI_ENABLED_FEATURES_OFFSET 16
#define SDSI_FEATURE_SDSI BIT(3)
#define SDSI_FEATURE_METERING BIT(26)
#define SDSI_SOCKET_ID_OFFSET 64
#define SDSI_SOCKET_ID GENMASK(3, 0)
@ -83,9 +84,10 @@
#define GUID_V2_REGS_SIZE 80
enum sdsi_command {
SDSI_CMD_PROVISION_AKC = 0x04,
SDSI_CMD_PROVISION_CAP = 0x08,
SDSI_CMD_READ_STATE = 0x10,
SDSI_CMD_PROVISION_AKC = 0x0004,
SDSI_CMD_PROVISION_CAP = 0x0008,
SDSI_CMD_READ_STATE = 0x0010,
SDSI_CMD_READ_METER = 0x0014,
};
struct sdsi_mbox_info {
@ -401,13 +403,10 @@ static ssize_t provision_cap_write(struct file *filp, struct kobject *kobj,
}
static BIN_ATTR_WO(provision_cap, SDSI_SIZE_WRITE_MSG);
static long state_certificate_read(struct file *filp, struct kobject *kobj,
struct bin_attribute *attr, char *buf, loff_t off,
size_t count)
static ssize_t
certificate_read(u64 command, struct sdsi_priv *priv, char *buf, loff_t off,
size_t count)
{
struct device *dev = kobj_to_dev(kobj);
struct sdsi_priv *priv = dev_get_drvdata(dev);
u64 command = SDSI_CMD_READ_STATE;
struct sdsi_mbox_info info;
size_t size;
int ret;
@ -444,7 +443,30 @@ free_buffer:
return size;
}
static BIN_ATTR(state_certificate, 0400, state_certificate_read, NULL, SDSI_SIZE_READ_MSG);
static ssize_t
state_certificate_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_STATE, priv, buf, off, count);
}
static BIN_ATTR_ADMIN_RO(state_certificate, SDSI_SIZE_READ_MSG);
static ssize_t
meter_certificate_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, priv, buf, off, count);
}
static BIN_ATTR_ADMIN_RO(meter_certificate, SDSI_SIZE_READ_MSG);
static ssize_t registers_read(struct file *filp, struct kobject *kobj,
struct bin_attribute *attr, char *buf, loff_t off,
@ -470,11 +492,12 @@ static ssize_t registers_read(struct file *filp, struct kobject *kobj,
return count;
}
static BIN_ATTR(registers, 0400, registers_read, NULL, SDSI_SIZE_REGS);
static BIN_ATTR_ADMIN_RO(registers, SDSI_SIZE_REGS);
static struct bin_attribute *sdsi_bin_attrs[] = {
&bin_attr_registers,
&bin_attr_state_certificate,
&bin_attr_meter_certificate,
&bin_attr_provision_akc,
&bin_attr_provision_cap,
NULL
@ -494,6 +517,10 @@ 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)
return (priv->features & SDSI_FEATURE_METERING) ?
attr->attr.mode : 0;
return attr->attr.mode;
}