diff options
| -rw-r--r-- | Documentation/ABI/stable/sysfs-driver-dma-idxd | 10 | ||||
| -rw-r--r-- | drivers/dma/idxd/device.c | 6 | ||||
| -rw-r--r-- | drivers/dma/idxd/idxd.h | 1 | ||||
| -rw-r--r-- | drivers/dma/idxd/registers.h | 5 | ||||
| -rw-r--r-- | drivers/dma/idxd/sysfs.c | 57 |
5 files changed, 74 insertions, 5 deletions
diff --git a/Documentation/ABI/stable/sysfs-driver-dma-idxd b/Documentation/ABI/stable/sysfs-driver-dma-idxd index 5d0df57f5298..534b7a3d59fc 100644 --- a/Documentation/ABI/stable/sysfs-driver-dma-idxd +++ b/Documentation/ABI/stable/sysfs-driver-dma-idxd @@ -235,6 +235,16 @@ 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: 6.4.0 +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 diff --git a/drivers/dma/idxd/device.c b/drivers/dma/idxd/device.c index fd97b2b58734..3c80b9681c72 100644 --- a/drivers/dma/idxd/device.c +++ b/drivers/dma/idxd/device.c @@ -967,12 +967,16 @@ 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)); diff --git a/drivers/dma/idxd/idxd.h b/drivers/dma/idxd/idxd.h index bd544eb2ddcb..e44b1d45ccd5 100644 --- a/drivers/dma/idxd/idxd.h +++ b/drivers/dma/idxd/idxd.h @@ -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 { diff --git a/drivers/dma/idxd/registers.h b/drivers/dma/idxd/registers.h index 9f3959d001b6..7b54a3939ea1 100644 --- a/drivers/dma/idxd/registers.h +++ b/drivers/dma/idxd/registers.h @@ -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; @@ -371,7 +372,7 @@ 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; diff --git a/drivers/dma/idxd/sysfs.c b/drivers/dma/idxd/sysfs.c index 465d2e7627e4..293739ac5596 100644 --- a/drivers/dma/idxd/sysfs.c +++ b/drivers/dma/idxd/sysfs.c @@ -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; } |