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dmaengine: idxd: Add wq occupancy information to sysfs attribute

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Add occupancy information to wq sysfs attribute. Attribute will show
wq occupancy data if "WQ Occupancy Support" field in WQCAP is 1. It
displays the number of entries currently in this WQ. This is provided
as an estimate and should not be relied on to determine whether there
is space in the WQ. The data is to provide information to user apps
for flow control.

Signed-off-by: Dave Jiang <dave.jiang@intel.com>
Link: https://lore.kernel.org/r/162275745546.1857062.8765615879420582018.stgit@djiang5-desk3.ch.intel.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
This commit is contained in:
Dave Jiang 2021-06-03 14:57:35 -07:00 committed by Vinod Koul
parent 0dcfe41e9a
commit e753a64bee
3 changed files with 29 additions and 0 deletions
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7
Documentation/ABI/stable/sysfs-driver-dma-idxd
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@ -211,6 +211,13 @@ 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>/occupancy
Date May 25, 2021
KernelVersion: 5.14.0
Contact: dmaengine@vger.kernel.org
Description: Show the current number of entries in this WQ if WQ Occupancy
Support bit WQ capabilities is 1.
What: /sys/bus/dsa/devices/engine<m>.<n>/group_id
Date: Oct 25, 2019
KernelVersion: 5.6.0

3
drivers/dma/idxd/registers.h
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@ -349,6 +349,9 @@ union wqcfg {
} __packed;
#define WQCFG_PASID_IDX 2
#define WQCFG_OCCUP_IDX 6
#define WQCFG_OCCUP_MASK 0xffff
/*
* This macro calculates the offset into the WQCFG register

19
drivers/dma/idxd/sysfs.c
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@ -1246,6 +1246,24 @@ 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_occupancy_show(struct device *dev, struct device_attribute *attr, char *buf)
{
struct idxd_wq *wq = confdev_to_wq(dev);
struct idxd_device *idxd = wq->idxd;
u32 occup, offset;
if (!idxd->hw.wq_cap.occupancy)
return -EOPNOTSUPP;
offset = WQCFG_OFFSET(idxd, wq->id, WQCFG_OCCUP_IDX);
occup = ioread32(idxd->reg_base + offset) & WQCFG_OCCUP_MASK;
return sysfs_emit(buf, "%u\n", occup);
}
static struct device_attribute dev_attr_wq_occupancy =
__ATTR(occupancy, 0444, wq_occupancy_show, NULL);
static struct attribute *idxd_wq_attributes[] = {
&dev_attr_wq_clients.attr,
&dev_attr_wq_state.attr,
@ -1261,6 +1279,7 @@ 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_occupancy.attr,
NULL,
};