swh:1:snp:173f8deb0c56c557784b4fd217e7608ac6197844
Tip revision: 6a8b55ed4056ea5559ebe4f6a4b247f627870d4c authored by Linus Torvalds on 26 April 2020, 20:51:02 UTC
Linux 5.7-rc3
Linux 5.7-rc3
Tip revision: 6a8b55e
card_sysfs.c
// SPDX-License-Identifier: GPL-2.0-only
/**
* IBM Accelerator Family 'GenWQE'
*
* (C) Copyright IBM Corp. 2013
*
* Author: Frank Haverkamp <haver@linux.vnet.ibm.com>
* Author: Joerg-Stephan Vogt <jsvogt@de.ibm.com>
* Author: Michael Jung <mijung@gmx.net>
* Author: Michael Ruettger <michael@ibmra.de>
*/
/*
* Sysfs interfaces for the GenWQE card. There are attributes to query
* the version of the bitstream as well as some for the driver. For
* debugging, please also see the debugfs interfaces of this driver.
*/
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/string.h>
#include <linux/fs.h>
#include <linux/sysfs.h>
#include <linux/ctype.h>
#include <linux/device.h>
#include "card_base.h"
#include "card_ddcb.h"
static const char * const genwqe_types[] = {
[GENWQE_TYPE_ALTERA_230] = "GenWQE4-230",
[GENWQE_TYPE_ALTERA_530] = "GenWQE4-530",
[GENWQE_TYPE_ALTERA_A4] = "GenWQE5-A4",
[GENWQE_TYPE_ALTERA_A7] = "GenWQE5-A7",
};
static ssize_t status_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct genwqe_dev *cd = dev_get_drvdata(dev);
const char *cs[GENWQE_CARD_STATE_MAX] = { "unused", "used", "error" };
return sprintf(buf, "%s\n", cs[cd->card_state]);
}
static DEVICE_ATTR_RO(status);
static ssize_t appid_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
char app_name[5];
struct genwqe_dev *cd = dev_get_drvdata(dev);
genwqe_read_app_id(cd, app_name, sizeof(app_name));
return sprintf(buf, "%s\n", app_name);
}
static DEVICE_ATTR_RO(appid);
static ssize_t version_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
u64 slu_id, app_id;
struct genwqe_dev *cd = dev_get_drvdata(dev);
slu_id = __genwqe_readq(cd, IO_SLU_UNITCFG);
app_id = __genwqe_readq(cd, IO_APP_UNITCFG);
return sprintf(buf, "%016llx.%016llx\n", slu_id, app_id);
}
static DEVICE_ATTR_RO(version);
static ssize_t type_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
u8 card_type;
struct genwqe_dev *cd = dev_get_drvdata(dev);
card_type = genwqe_card_type(cd);
return sprintf(buf, "%s\n", (card_type >= ARRAY_SIZE(genwqe_types)) ?
"invalid" : genwqe_types[card_type]);
}
static DEVICE_ATTR_RO(type);
static ssize_t tempsens_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
u64 tempsens;
struct genwqe_dev *cd = dev_get_drvdata(dev);
tempsens = __genwqe_readq(cd, IO_SLU_TEMPERATURE_SENSOR);
return sprintf(buf, "%016llx\n", tempsens);
}
static DEVICE_ATTR_RO(tempsens);
static ssize_t freerunning_timer_show(struct device *dev,
struct device_attribute *attr,
char *buf)
{
u64 t;
struct genwqe_dev *cd = dev_get_drvdata(dev);
t = __genwqe_readq(cd, IO_SLC_FREE_RUNNING_TIMER);
return sprintf(buf, "%016llx\n", t);
}
static DEVICE_ATTR_RO(freerunning_timer);
static ssize_t queue_working_time_show(struct device *dev,
struct device_attribute *attr,
char *buf)
{
u64 t;
struct genwqe_dev *cd = dev_get_drvdata(dev);
t = __genwqe_readq(cd, IO_SLC_QUEUE_WTIME);
return sprintf(buf, "%016llx\n", t);
}
static DEVICE_ATTR_RO(queue_working_time);
static ssize_t base_clock_show(struct device *dev,
struct device_attribute *attr,
char *buf)
{
u64 base_clock;
struct genwqe_dev *cd = dev_get_drvdata(dev);
base_clock = genwqe_base_clock_frequency(cd);
return sprintf(buf, "%lld\n", base_clock);
}
static DEVICE_ATTR_RO(base_clock);
/**
* curr_bitstream_show() - Show the current bitstream id
*
* There is a bug in some old versions of the CPLD which selects the
* bitstream, which causes the IO_SLU_BITSTREAM register to report
* unreliable data in very rare cases. This makes this sysfs
* unreliable up to the point were a new CPLD version is being used.
*
* Unfortunately there is no automatic way yet to query the CPLD
* version, such that you need to manually ensure via programming
* tools that you have a recent version of the CPLD software.
*
* The proposed circumvention is to use a special recovery bitstream
* on the backup partition (0) to identify problems while loading the
* image.
*/
static ssize_t curr_bitstream_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
int curr_bitstream;
struct genwqe_dev *cd = dev_get_drvdata(dev);
curr_bitstream = __genwqe_readq(cd, IO_SLU_BITSTREAM) & 0x1;
return sprintf(buf, "%d\n", curr_bitstream);
}
static DEVICE_ATTR_RO(curr_bitstream);
/**
* next_bitstream_show() - Show the next activated bitstream
*
* IO_SLC_CFGREG_SOFTRESET: This register can only be accessed by the PF.
*/
static ssize_t next_bitstream_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
int next_bitstream;
struct genwqe_dev *cd = dev_get_drvdata(dev);
switch ((cd->softreset & 0xc) >> 2) {
case 0x2:
next_bitstream = 0;
break;
case 0x3:
next_bitstream = 1;
break;
default:
next_bitstream = -1;
break; /* error */
}
return sprintf(buf, "%d\n", next_bitstream);
}
static ssize_t next_bitstream_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
int partition;
struct genwqe_dev *cd = dev_get_drvdata(dev);
if (kstrtoint(buf, 0, &partition) < 0)
return -EINVAL;
switch (partition) {
case 0x0:
cd->softreset = 0x78;
break;
case 0x1:
cd->softreset = 0x7c;
break;
default:
return -EINVAL;
}
__genwqe_writeq(cd, IO_SLC_CFGREG_SOFTRESET, cd->softreset);
return count;
}
static DEVICE_ATTR_RW(next_bitstream);
static ssize_t reload_bitstream_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
int reload;
struct genwqe_dev *cd = dev_get_drvdata(dev);
if (kstrtoint(buf, 0, &reload) < 0)
return -EINVAL;
if (reload == 0x1) {
if (cd->card_state == GENWQE_CARD_UNUSED ||
cd->card_state == GENWQE_CARD_USED)
cd->card_state = GENWQE_CARD_RELOAD_BITSTREAM;
else
return -EIO;
} else {
return -EINVAL;
}
return count;
}
static DEVICE_ATTR_WO(reload_bitstream);
/*
* Create device_attribute structures / params: name, mode, show, store
* additional flag if valid in VF
*/
static struct attribute *genwqe_attributes[] = {
&dev_attr_tempsens.attr,
&dev_attr_next_bitstream.attr,
&dev_attr_curr_bitstream.attr,
&dev_attr_base_clock.attr,
&dev_attr_type.attr,
&dev_attr_version.attr,
&dev_attr_appid.attr,
&dev_attr_status.attr,
&dev_attr_freerunning_timer.attr,
&dev_attr_queue_working_time.attr,
&dev_attr_reload_bitstream.attr,
NULL,
};
static struct attribute *genwqe_normal_attributes[] = {
&dev_attr_type.attr,
&dev_attr_version.attr,
&dev_attr_appid.attr,
&dev_attr_status.attr,
&dev_attr_freerunning_timer.attr,
&dev_attr_queue_working_time.attr,
NULL,
};
/**
* genwqe_is_visible() - Determine if sysfs attribute should be visible or not
*
* VFs have restricted mmio capabilities, so not all sysfs entries
* are allowed in VFs.
*/
static umode_t genwqe_is_visible(struct kobject *kobj,
struct attribute *attr, int n)
{
unsigned int j;
struct device *dev = kobj_to_dev(kobj);
struct genwqe_dev *cd = dev_get_drvdata(dev);
umode_t mode = attr->mode;
if (genwqe_is_privileged(cd))
return mode;
for (j = 0; genwqe_normal_attributes[j] != NULL; j++)
if (genwqe_normal_attributes[j] == attr)
return mode;
return 0;
}
static struct attribute_group genwqe_attribute_group = {
.is_visible = genwqe_is_visible,
.attrs = genwqe_attributes,
};
const struct attribute_group *genwqe_attribute_groups[] = {
&genwqe_attribute_group,
NULL,
};