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dmaengine: idxd: deprecate token sysfs attributes for read buffers

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The following sysfs attributes will be obsolete due to the name change of
tokens to read buffers:
max_tokens
token_limit
group/tokens_allowed
group/tokens_reserved
group/use_token_limit

Create new entries and have old entry print warning of deprecation.

New attributes to replace the token ones:
max_read_buffers
read_buffer_limit
group/read_buffers_allowed
group/read_buffers_reserved
group/use_read_buffer_limit

Signed-off-by: Dave Jiang <dave.jiang@intel.com>
Link: https://lore.kernel.org/r/163951339488.2988321.2424012059911316373.stgit@djiang5-desk3.ch.intel.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
This commit is contained in:
Dave Jiang 2021-12-14 13:23:14 -07:00 committed by Vinod Koul
parent 7ed6f1b85f
commit fde212e44f
2 changed files with 153 additions and 39 deletions
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47
Documentation/ABI/stable/sysfs-driver-dma-idxd
View File

@ -41,14 +41,14 @@ KernelVersion: 5.6.0
Contact: dmaengine@vger.kernel.org
Description: The maximum number of groups can be created under this device.
What: /sys/bus/dsa/devices/dsa<m>/max_tokens
Date: Oct 25, 2019
KernelVersion: 5.6.0
What: /sys/bus/dsa/devices/dsa<m>/max_read_buffers
Date: Dec 10, 2021
KernelVersion: 5.17.0
Contact: dmaengine@vger.kernel.org
Description: The total number of bandwidth tokens supported by this device.
The bandwidth tokens represent resources within the DSA
Description: The total number of read buffers supported by this device.
The read buffers represent resources within the DSA
implementation, and these resources are allocated by engines to
support operations.
support operations. See DSA spec v1.2 9.2.4 Total Read Buffers.
What: /sys/bus/dsa/devices/dsa<m>/max_transfer_size
Date: Oct 25, 2019
@ -115,13 +115,13 @@ KernelVersion: 5.6.0
Contact: dmaengine@vger.kernel.org
Description: To indicate if this device is configurable or not.
What: /sys/bus/dsa/devices/dsa<m>/token_limit
Date: Oct 25, 2019
KernelVersion: 5.6.0
What: /sys/bus/dsa/devices/dsa<m>/read_buffer_limit
Date: Dec 10, 2021
KernelVersion: 5.17.0
Contact: dmaengine@vger.kernel.org
Description: The maximum number of bandwidth tokens that may be in use at
Description: The maximum number of read buffers that may be in use at
one time by operations that access low bandwidth memory in the
device.
device. See DSA spec v1.2 9.2.8 GENCFG on Global Read Buffer Limit.
What: /sys/bus/dsa/devices/dsa<m>/cmd_status
Date: Aug 28, 2020
@ -224,7 +224,7 @@ What: /sys/bus/dsa/devices/wq<m>.<n>/enqcmds_retries
Date Oct 29, 2021
KernelVersion: 5.17.0
Contact: dmaengine@vger.kernel.org
Description: Indicate the number of retires for an enqcmds submission on a shared wq.
Description: Indicate the number of retires for an enqcmds submission on a sharedwq.
A max value to set attribute is capped at 64.
What: /sys/bus/dsa/devices/engine<m>.<n>/group_id
@ -232,3 +232,26 @@ Date: Oct 25, 2019
KernelVersion: 5.6.0
Contact: dmaengine@vger.kernel.org
Description: The group that this engine belongs to.
What: /sys/bus/dsa/devices/group<m>.<n>/use_read_buffer_limit
Date: Dec 10, 2021
KernelVersion: 5.17.0
Contact: dmaengine@vger.kernel.org
Description: Enable the use of global read buffer limit for the group. See DSA
spec v1.2 9.2.18 GRPCFG Use Global Read Buffer Limit.
What: /sys/bus/dsa/devices/group<m>.<n>/read_buffers_allowed
Date: Dec 10, 2021
KernelVersion: 5.17.0
Contact: dmaengine@vger.kernel.org
Description: Indicates max number of read buffers that may be in use at one time
by all engines in the group. See DSA spec v1.2 9.2.18 GRPCFG Read
Buffers Allowed.
What: /sys/bus/dsa/devices/group<m>.<n>/read_buffers_reserved
Date: Dec 10, 2021
KernelVersion: 5.17.0
Contact: dmaengine@vger.kernel.org
Description: Indicates the number of Read Buffers reserved for the use of
engines in the group. See DSA spec v1.2 9.2.18 GRPCFG Read Buffers
Reserved.

145
drivers/dma/idxd/sysfs.c
View File

@ -112,18 +112,26 @@ static void idxd_set_free_rdbufs(struct idxd_device *idxd)
idxd->nr_rdbufs = idxd->max_rdbufs - rdbufs;
}
static ssize_t group_tokens_reserved_show(struct device *dev,
struct device_attribute *attr,
char *buf)
static ssize_t group_read_buffers_reserved_show(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct idxd_group *group = confdev_to_group(dev);
return sysfs_emit(buf, "%u\n", group->rdbufs_reserved);
}
static ssize_t group_tokens_reserved_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
static ssize_t group_tokens_reserved_show(struct device *dev,
struct device_attribute *attr,
char *buf)
{
dev_warn_once(dev, "attribute deprecated, see read_buffers_reserved.\n");
return group_read_buffers_reserved_show(dev, attr, buf);
}
static ssize_t group_read_buffers_reserved_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
struct idxd_group *group = confdev_to_group(dev);
struct idxd_device *idxd = group->idxd;
@ -154,22 +162,42 @@ static ssize_t group_tokens_reserved_store(struct device *dev,
return count;
}
static ssize_t group_tokens_reserved_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
dev_warn_once(dev, "attribute deprecated, see read_buffers_reserved.\n");
return group_read_buffers_reserved_store(dev, attr, buf, count);
}
static struct device_attribute dev_attr_group_tokens_reserved =
__ATTR(tokens_reserved, 0644, group_tokens_reserved_show,
group_tokens_reserved_store);
static ssize_t group_tokens_allowed_show(struct device *dev,
struct device_attribute *attr,
char *buf)
static struct device_attribute dev_attr_group_read_buffers_reserved =
__ATTR(read_buffers_reserved, 0644, group_read_buffers_reserved_show,
group_read_buffers_reserved_store);
static ssize_t group_read_buffers_allowed_show(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct idxd_group *group = confdev_to_group(dev);
return sysfs_emit(buf, "%u\n", group->rdbufs_allowed);
}
static ssize_t group_tokens_allowed_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
static ssize_t group_tokens_allowed_show(struct device *dev,
struct device_attribute *attr,
char *buf)
{
dev_warn_once(dev, "attribute deprecated, see read_buffers_allowed.\n");
return group_read_buffers_allowed_show(dev, attr, buf);
}
static ssize_t group_read_buffers_allowed_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
struct idxd_group *group = confdev_to_group(dev);
struct idxd_device *idxd = group->idxd;
@ -197,22 +225,42 @@ static ssize_t group_tokens_allowed_store(struct device *dev,
return count;
}
static ssize_t group_tokens_allowed_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
dev_warn_once(dev, "attribute deprecated, see read_buffers_allowed.\n");
return group_read_buffers_allowed_store(dev, attr, buf, count);
}
static struct device_attribute dev_attr_group_tokens_allowed =
__ATTR(tokens_allowed, 0644, group_tokens_allowed_show,
group_tokens_allowed_store);
static ssize_t group_use_token_limit_show(struct device *dev,
struct device_attribute *attr,
char *buf)
static struct device_attribute dev_attr_group_read_buffers_allowed =
__ATTR(read_buffers_allowed, 0644, group_read_buffers_allowed_show,
group_read_buffers_allowed_store);
static ssize_t group_use_read_buffer_limit_show(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct idxd_group *group = confdev_to_group(dev);
return sysfs_emit(buf, "%u\n", group->use_rdbuf_limit);
}
static ssize_t group_use_token_limit_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
static ssize_t group_use_token_limit_show(struct device *dev,
struct device_attribute *attr,
char *buf)
{
dev_warn_once(dev, "attribute deprecated, see use_read_buffer_limit.\n");
return group_use_read_buffer_limit_show(dev, attr, buf);
}
static ssize_t group_use_read_buffer_limit_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
struct idxd_group *group = confdev_to_group(dev);
struct idxd_device *idxd = group->idxd;
@ -239,10 +287,22 @@ static ssize_t group_use_token_limit_store(struct device *dev,
return count;
}
static ssize_t group_use_token_limit_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
dev_warn_once(dev, "attribute deprecated, see use_read_buffer_limit.\n");
return group_use_read_buffer_limit_store(dev, attr, buf, count);
}
static struct device_attribute dev_attr_group_use_token_limit =
__ATTR(use_token_limit, 0644, group_use_token_limit_show,
group_use_token_limit_store);
static struct device_attribute dev_attr_group_use_read_buffer_limit =
__ATTR(use_read_buffer_limit, 0644, group_use_read_buffer_limit_show,
group_use_read_buffer_limit_store);
static ssize_t group_engines_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
@ -387,8 +447,11 @@ static struct attribute *idxd_group_attributes[] = {
&dev_attr_group_work_queues.attr,
&dev_attr_group_engines.attr,
&dev_attr_group_use_token_limit.attr,
&dev_attr_group_use_read_buffer_limit.attr,
&dev_attr_group_tokens_allowed.attr,
&dev_attr_group_read_buffers_allowed.attr,
&dev_attr_group_tokens_reserved.attr,
&dev_attr_group_read_buffers_reserved.attr,
&dev_attr_group_traffic_class_a.attr,
&dev_attr_group_traffic_class_b.attr,
NULL,
@ -1192,26 +1255,42 @@ static ssize_t errors_show(struct device *dev,
}
static DEVICE_ATTR_RO(errors);
static ssize_t max_tokens_show(struct device *dev,
struct device_attribute *attr, char *buf)
static ssize_t max_read_buffers_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct idxd_device *idxd = confdev_to_idxd(dev);
return sysfs_emit(buf, "%u\n", idxd->max_rdbufs);
}
static DEVICE_ATTR_RO(max_tokens);
static ssize_t token_limit_show(struct device *dev,
struct device_attribute *attr, char *buf)
static ssize_t max_tokens_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
dev_warn_once(dev, "attribute deprecated, see max_read_buffers.\n");
return max_read_buffers_show(dev, attr, buf);
}
static DEVICE_ATTR_RO(max_tokens); /* deprecated */
static DEVICE_ATTR_RO(max_read_buffers);
static ssize_t read_buffer_limit_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct idxd_device *idxd = confdev_to_idxd(dev);
return sysfs_emit(buf, "%u\n", idxd->rdbuf_limit);
}
static ssize_t token_limit_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
static ssize_t token_limit_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
dev_warn_once(dev, "attribute deprecated, see read_buffer_limit.\n");
return read_buffer_limit_show(dev, attr, buf);
}
static ssize_t read_buffer_limit_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
struct idxd_device *idxd = confdev_to_idxd(dev);
unsigned long val;
@ -1236,7 +1315,17 @@ static ssize_t token_limit_store(struct device *dev,
idxd->rdbuf_limit = val;
return count;
}
static DEVICE_ATTR_RW(token_limit);
static ssize_t token_limit_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
dev_warn_once(dev, "attribute deprecated, see read_buffer_limit\n");
return read_buffer_limit_store(dev, attr, buf, count);
}
static DEVICE_ATTR_RW(token_limit); /* deprecated */
static DEVICE_ATTR_RW(read_buffer_limit);
static ssize_t cdev_major_show(struct device *dev,
struct device_attribute *attr, char *buf)
@ -1282,7 +1371,9 @@ static struct attribute *idxd_device_attributes[] = {
&dev_attr_state.attr,
&dev_attr_errors.attr,
&dev_attr_max_tokens.attr,
&dev_attr_max_read_buffers.attr,
&dev_attr_token_limit.attr,
&dev_attr_read_buffer_limit.attr,
&dev_attr_cdev_major.attr,
&dev_attr_cmd_status.attr,
NULL,