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dmaengine: idxd: add per wq PRS disable

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Add sysfs knob for per wq Page Request Service disable. This knob
disables PRS support for the specific wq. When this bit is set,
it also overrides the wq's block on fault enabling.

Tested-by: Tony Zhu <tony.zhu@intel.com>
Signed-off-by: Dave Jiang <dave.jiang@intel.com>
Co-developed-by: Fenghua Yu <fenghua.yu@intel.com>
Signed-off-by: Fenghua Yu <fenghua.yu@intel.com>
Link: https://lore.kernel.org/r/20230407203143.2189681-17-fenghua.yu@intel.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
This commit is contained in:
Dave Jiang 2023-04-07 13:31:43 -07:00 committed by Vinod Koul
parent a62b8f87c7
commit f2dc327131
5 changed files with 74 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
Documentation/ABI/stable/sysfs-driver-dma-idxd
View File

@ -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

6
drivers/dma/idxd/device.c
View File

@ -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));

1
drivers/dma/idxd/idxd.h
View File

@ -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 {

5
drivers/dma/idxd/registers.h
View File

@ -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;

57
drivers/dma/idxd/sysfs.c
View File

@ -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;
}