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crypto: qat - add num_rps sysfs attribute

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Add the attribute `num_rps` to the `qat` attribute group. This returns
the number of ring pairs that a single device has. This allows to know
the maximum value that can be set to the attribute `rp2svc`.

Signed-off-by: Ciunas Bennett <ciunas.bennett@intel.com>
Reviewed-by: Giovanni Cabiddu <giovanni.cabiddu@intel.com>
Reviewed-by: Damian Muszynski <damian.muszynski@intel.com>
Reviewed-by: Tero Kristo <tero.kristo@linux.intel.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Ciunas Bennett 2023-10-20 15:49:31 +02:00 committed by Herbert Xu
parent dbc8876dd8
commit 71fed09b49
2 changed files with 28 additions and 0 deletions
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14
Documentation/ABI/testing/sysfs-driver-qat
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@ -127,3 +127,17 @@ Description:
sym
This attribute is only available for qat_4xxx devices.
What: /sys/bus/pci/devices/<BDF>/qat/num_rps
Date: January 2024
KernelVersion: 6.7
Contact: qat-linux@intel.com
Description:
(RO) Returns the number of ring pairs that a single device has.
Example usage::
# cat /sys/bus/pci/devices/<BDF>/qat/num_rps
64
This attribute is only available for qat_4xxx devices.

14
drivers/crypto/intel/qat/qat_common/adf_sysfs.c
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@ -268,11 +268,25 @@ static ssize_t rp2srv_store(struct device *dev, struct device_attribute *attr,
}
static DEVICE_ATTR_RW(rp2srv);
static ssize_t num_rps_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct adf_accel_dev *accel_dev;
accel_dev = adf_devmgr_pci_to_accel_dev(to_pci_dev(dev));
if (!accel_dev)
return -EINVAL;
return sysfs_emit(buf, "%u\n", GET_MAX_BANKS(accel_dev));
}
static DEVICE_ATTR_RO(num_rps);
static struct attribute *qat_attrs[] = {
&dev_attr_state.attr,
&dev_attr_cfg_services.attr,
&dev_attr_pm_idle_enabled.attr,
&dev_attr_rp2srv.attr,
&dev_attr_num_rps.attr,
NULL,
};