@@ -227,6 +227,16 @@ Contact: dmaengine@vger.kernel.org
Description: Indicate whether ATS disable is turned on for the workqueue.
0 indicates ATS is on, and 1 indicates ATS is off for the workqueue.
+What: /sys/bus/dsa/devices/wq<m>.<n>/prs_disable
+Date: Sept 14, 2022
+KernelVersion: 6.2.0
+Contact: dmaengine@vger.kernel.org
+Description: Controls whether PRS disable is turned on for the workqueue.
+ 0 indicates PRS is on, and 1 indicates PRS is off for the
+ workqueue. This option overrides block_on_fault attribute
+ if set. It's visible only on platforms that support the
+ capability.
+
What: /sys/bus/dsa/devices/wq<m>.<n>/occupancy
Date May 25, 2021
KernelVersion: 5.14.0
@@ -963,12 +963,16 @@ static int idxd_wq_config_write(struct idxd_wq *wq)
wq->wqcfg->priority = wq->priority;
if (idxd->hw.gen_cap.block_on_fault &&
- test_bit(WQ_FLAG_BLOCK_ON_FAULT, &wq->flags))
+ test_bit(WQ_FLAG_BLOCK_ON_FAULT, &wq->flags) &&
+ !test_bit(WQ_FLAG_PRS_DISABLE, &wq->flags))
wq->wqcfg->bof = 1;
if (idxd->hw.wq_cap.wq_ats_support)
wq->wqcfg->wq_ats_disable = test_bit(WQ_FLAG_ATS_DISABLE, &wq->flags);
+ if (idxd->hw.wq_cap.wq_prs_support)
+ wq->wqcfg->wq_prs_disable = test_bit(WQ_FLAG_PRS_DISABLE, &wq->flags);
+
/* bytes 12-15 */
wq->wqcfg->max_xfer_shift = ilog2(wq->max_xfer_bytes);
idxd_wqcfg_set_max_batch_shift(idxd->data->type, wq->wqcfg, ilog2(wq->max_batch_size));
@@ -143,6 +143,7 @@ enum idxd_wq_flag {
WQ_FLAG_DEDICATED = 0,
WQ_FLAG_BLOCK_ON_FAULT,
WQ_FLAG_ATS_DISABLE,
+ WQ_FLAG_PRS_DISABLE,
};
enum idxd_wq_type {
@@ -59,7 +59,8 @@ union wq_cap_reg {
u64 occupancy:1;
u64 occupancy_int:1;
u64 op_config:1;
- u64 rsvd3:9;
+ u64 wq_prs_support:1;
+ u64 rsvd4:8;
};
u64 bits;
} __packed;
@@ -350,7 +351,7 @@ union wqcfg {
u32 mode:1; /* shared or dedicated */
u32 bof:1; /* block on fault */
u32 wq_ats_disable:1;
- u32 rsvd2:1;
+ u32 wq_prs_disable:1;
u32 priority:4;
u32 pasid:20;
u32 pasid_en:1;
@@ -822,10 +822,14 @@ static ssize_t wq_block_on_fault_store(struct device *dev,
if (rc < 0)
return rc;
- if (bof)
+ if (bof) {
+ if (test_bit(WQ_FLAG_PRS_DISABLE, &wq->flags))
+ return -EOPNOTSUPP;
+
set_bit(WQ_FLAG_BLOCK_ON_FAULT, &wq->flags);
- else
+ } else {
clear_bit(WQ_FLAG_BLOCK_ON_FAULT, &wq->flags);
+ }
return count;
}
@@ -1109,6 +1113,44 @@ static ssize_t wq_ats_disable_store(struct device *dev, struct device_attribute
static struct device_attribute dev_attr_wq_ats_disable =
__ATTR(ats_disable, 0644, wq_ats_disable_show, wq_ats_disable_store);
+static ssize_t wq_prs_disable_show(struct device *dev, struct device_attribute *attr, char *buf)
+{
+ struct idxd_wq *wq = confdev_to_wq(dev);
+
+ return sysfs_emit(buf, "%u\n", test_bit(WQ_FLAG_PRS_DISABLE, &wq->flags));
+}
+
+static ssize_t wq_prs_disable_store(struct device *dev, struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct idxd_wq *wq = confdev_to_wq(dev);
+ struct idxd_device *idxd = wq->idxd;
+ bool prs_dis;
+ int rc;
+
+ if (wq->state != IDXD_WQ_DISABLED)
+ return -EPERM;
+
+ if (!idxd->hw.wq_cap.wq_prs_support)
+ return -EOPNOTSUPP;
+
+ rc = kstrtobool(buf, &prs_dis);
+ if (rc < 0)
+ return rc;
+
+ if (prs_dis) {
+ set_bit(WQ_FLAG_PRS_DISABLE, &wq->flags);
+ /* when PRS is disabled, BOF needs to be off as well */
+ clear_bit(WQ_FLAG_BLOCK_ON_FAULT, &wq->flags);
+ } else {
+ clear_bit(WQ_FLAG_PRS_DISABLE, &wq->flags);
+ }
+ return count;
+}
+
+static struct device_attribute dev_attr_wq_prs_disable =
+ __ATTR(prs_disable, 0644, wq_prs_disable_show, wq_prs_disable_store);
+
static ssize_t wq_occupancy_show(struct device *dev, struct device_attribute *attr, char *buf)
{
struct idxd_wq *wq = confdev_to_wq(dev);
@@ -1239,6 +1281,7 @@ static struct attribute *idxd_wq_attributes[] = {
&dev_attr_wq_max_transfer_size.attr,
&dev_attr_wq_max_batch_size.attr,
&dev_attr_wq_ats_disable.attr,
+ &dev_attr_wq_prs_disable.attr,
&dev_attr_wq_occupancy.attr,
&dev_attr_wq_enqcmds_retries.attr,
&dev_attr_wq_op_config.attr,
@@ -1260,6 +1303,13 @@ static bool idxd_wq_attr_max_batch_size_invisible(struct attribute *attr,
idxd->data->type == IDXD_TYPE_IAX;
}
+static bool idxd_wq_attr_wq_prs_disable_invisible(struct attribute *attr,
+ struct idxd_device *idxd)
+{
+ return attr == &dev_attr_wq_prs_disable.attr &&
+ !idxd->hw.wq_cap.wq_prs_support;
+}
+
static umode_t idxd_wq_attr_visible(struct kobject *kobj,
struct attribute *attr, int n)
{
@@ -1273,6 +1323,9 @@ static umode_t idxd_wq_attr_visible(struct kobject *kobj,
if (idxd_wq_attr_max_batch_size_invisible(attr, idxd))
return 0;
+ if (idxd_wq_attr_wq_prs_disable_invisible(attr, idxd))
+ return 0;
+
return attr->mode;
}