linux/drivers/rapidio/rio-sysfs.c

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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* RapidIO sysfs attributes and support
*
* Copyright 2005 MontaVista Software, Inc.
* Matt Porter <mporter@kernel.crashing.org>
*/
#include <linux/kernel.h>
#include <linux/rio.h>
#include <linux/rio_drv.h>
#include <linux/stat.h>
#include <linux/capability.h>
#include "rio.h"
/* Sysfs support */
#define rio_config_attr(field, format_string) \
static ssize_t \
field##_show(struct device *dev, struct device_attribute *attr, char *buf) \
{ \
struct rio_dev *rdev = to_rio_dev(dev); \
\
return sprintf(buf, format_string, rdev->field); \
} \
static DEVICE_ATTR_RO(field);
rio_config_attr(did, "0x%04x\n");
rio_config_attr(vid, "0x%04x\n");
rio_config_attr(device_rev, "0x%08x\n");
rio_config_attr(asm_did, "0x%04x\n");
rio_config_attr(asm_vid, "0x%04x\n");
rio_config_attr(asm_rev, "0x%04x\n");
rio_config_attr(destid, "0x%04x\n");
rio_config_attr(hopcount, "0x%02x\n");
static ssize_t routes_show(struct device *dev, struct device_attribute *attr, char *buf)
{
struct rio_dev *rdev = to_rio_dev(dev);
char *str = buf;
int i;
for (i = 0; i < RIO_MAX_ROUTE_ENTRIES(rdev->net->hport->sys_size);
i++) {
if (rdev->rswitch->route_table[i] == RIO_INVALID_ROUTE)
continue;
str +=
sprintf(str, "%04x %02x\n", i,
rdev->rswitch->route_table[i]);
}
return (str - buf);
}
static DEVICE_ATTR_RO(routes);
static ssize_t lprev_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct rio_dev *rdev = to_rio_dev(dev);
return sprintf(buf, "%s\n",
(rdev->prev) ? rio_name(rdev->prev) : "root");
}
static DEVICE_ATTR_RO(lprev);
static ssize_t lnext_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct rio_dev *rdev = to_rio_dev(dev);
char *str = buf;
int i;
if (rdev->pef & RIO_PEF_SWITCH) {
for (i = 0; i < RIO_GET_TOTAL_PORTS(rdev->swpinfo); i++) {
if (rdev->rswitch->nextdev[i])
str += sprintf(str, "%s\n",
rio_name(rdev->rswitch->nextdev[i]));
else
str += sprintf(str, "null\n");
}
}
return str - buf;
}
static DEVICE_ATTR_RO(lnext);
static ssize_t modalias_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct rio_dev *rdev = to_rio_dev(dev);
return sprintf(buf, "rapidio:v%04Xd%04Xav%04Xad%04X\n",
rdev->vid, rdev->did, rdev->asm_vid, rdev->asm_did);
}
static DEVICE_ATTR_RO(modalias);
static struct attribute *rio_dev_attrs[] = {
&dev_attr_did.attr,
&dev_attr_vid.attr,
&dev_attr_device_rev.attr,
&dev_attr_asm_did.attr,
&dev_attr_asm_vid.attr,
&dev_attr_asm_rev.attr,
&dev_attr_lprev.attr,
&dev_attr_destid.attr,
&dev_attr_modalias.attr,
/* Switch-only attributes */
&dev_attr_routes.attr,
&dev_attr_lnext.attr,
&dev_attr_hopcount.attr,
NULL,
};
static ssize_t
rio_read_config(struct file *filp, struct kobject *kobj,
struct bin_attribute *bin_attr,
sysfs: add parameter "struct bin_attribute *" in .read/.write methods for sysfs binary attributes Well, first of all, I don't want to change so many files either. What I do: Adding a new parameter "struct bin_attribute *" in the .read/.write methods for the sysfs binary attributes. In fact, only the four lines change in fs/sysfs/bin.c and include/linux/sysfs.h do the real work. But I have to update all the files that use binary attributes to make them compatible with the new .read and .write methods. I'm not sure if I missed any. :( Why I do this: For a sysfs attribute, we can get a pointer pointing to the struct attribute in the .show/.store method, while we can't do this for the binary attributes. I don't know why this is different, but this does make it not so handy to use the binary attributes as the regular ones. So I think this patch is reasonable. :) Who benefits from it: The patch that exposes ACPI tables in sysfs requires such an improvement. All the table binary attributes share the same .read method. Parameter "struct bin_attribute *" is used to get the table signature and instance number which are used to distinguish different ACPI table binary attributes. Without this parameter, we need to offer different .read methods for different ACPI table binary attributes. This is impossible as there are various ACPI tables on different platforms, and we don't know what they are until they are loaded. Signed-off-by: Zhang Rui <rui.zhang@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2007-06-09 05:57:22 +00:00
char *buf, loff_t off, size_t count)
{
struct rio_dev *dev = to_rio_dev(kobj_to_dev(kobj));
unsigned int size = 0x100;
loff_t init_off = off;
u8 *data = (u8 *) buf;
/* Several chips lock up trying to read undefined config space */
if (capable(CAP_SYS_ADMIN))
size = RIO_MAINT_SPACE_SZ;
if (off >= size)
return 0;
if (off + count > size) {
size -= off;
count = size;
} else {
size = count;
}
if ((off & 1) && size) {
u8 val;
rio_read_config_8(dev, off, &val);
data[off - init_off] = val;
off++;
size--;
}
if ((off & 3) && size > 2) {
u16 val;
rio_read_config_16(dev, off, &val);
data[off - init_off] = (val >> 8) & 0xff;
data[off - init_off + 1] = val & 0xff;
off += 2;
size -= 2;
}
while (size > 3) {
u32 val;
rio_read_config_32(dev, off, &val);
data[off - init_off] = (val >> 24) & 0xff;
data[off - init_off + 1] = (val >> 16) & 0xff;
data[off - init_off + 2] = (val >> 8) & 0xff;
data[off - init_off + 3] = val & 0xff;
off += 4;
size -= 4;
}
if (size >= 2) {
u16 val;
rio_read_config_16(dev, off, &val);
data[off - init_off] = (val >> 8) & 0xff;
data[off - init_off + 1] = val & 0xff;
off += 2;
size -= 2;
}
if (size > 0) {
u8 val;
rio_read_config_8(dev, off, &val);
data[off - init_off] = val;
off++;
--size;
}
return count;
}
static ssize_t
rio_write_config(struct file *filp, struct kobject *kobj,
struct bin_attribute *bin_attr,
sysfs: add parameter "struct bin_attribute *" in .read/.write methods for sysfs binary attributes Well, first of all, I don't want to change so many files either. What I do: Adding a new parameter "struct bin_attribute *" in the .read/.write methods for the sysfs binary attributes. In fact, only the four lines change in fs/sysfs/bin.c and include/linux/sysfs.h do the real work. But I have to update all the files that use binary attributes to make them compatible with the new .read and .write methods. I'm not sure if I missed any. :( Why I do this: For a sysfs attribute, we can get a pointer pointing to the struct attribute in the .show/.store method, while we can't do this for the binary attributes. I don't know why this is different, but this does make it not so handy to use the binary attributes as the regular ones. So I think this patch is reasonable. :) Who benefits from it: The patch that exposes ACPI tables in sysfs requires such an improvement. All the table binary attributes share the same .read method. Parameter "struct bin_attribute *" is used to get the table signature and instance number which are used to distinguish different ACPI table binary attributes. Without this parameter, we need to offer different .read methods for different ACPI table binary attributes. This is impossible as there are various ACPI tables on different platforms, and we don't know what they are until they are loaded. Signed-off-by: Zhang Rui <rui.zhang@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2007-06-09 05:57:22 +00:00
char *buf, loff_t off, size_t count)
{
struct rio_dev *dev = to_rio_dev(kobj_to_dev(kobj));
unsigned int size = count;
loff_t init_off = off;
u8 *data = (u8 *) buf;
if (off >= RIO_MAINT_SPACE_SZ)
return 0;
if (off + count > RIO_MAINT_SPACE_SZ) {
size = RIO_MAINT_SPACE_SZ - off;
count = size;
}
if ((off & 1) && size) {
rio_write_config_8(dev, off, data[off - init_off]);
off++;
size--;
}
if ((off & 3) && (size > 2)) {
u16 val = data[off - init_off + 1];
val |= (u16) data[off - init_off] << 8;
rio_write_config_16(dev, off, val);
off += 2;
size -= 2;
}
while (size > 3) {
u32 val = data[off - init_off + 3];
val |= (u32) data[off - init_off + 2] << 8;
val |= (u32) data[off - init_off + 1] << 16;
val |= (u32) data[off - init_off] << 24;
rio_write_config_32(dev, off, val);
off += 4;
size -= 4;
}
if (size >= 2) {
u16 val = data[off - init_off + 1];
val |= (u16) data[off - init_off] << 8;
rio_write_config_16(dev, off, val);
off += 2;
size -= 2;
}
if (size) {
rio_write_config_8(dev, off, data[off - init_off]);
off++;
--size;
}
return count;
}
static struct bin_attribute rio_config_attr = {
.attr = {
.name = "config",
.mode = S_IRUGO | S_IWUSR,
},
.size = RIO_MAINT_SPACE_SZ,
.read = rio_read_config,
.write = rio_write_config,
};
static struct bin_attribute *rio_dev_bin_attrs[] = {
&rio_config_attr,
NULL,
};
static umode_t rio_dev_is_attr_visible(struct kobject *kobj,
struct attribute *attr, int n)
{
struct rio_dev *rdev = to_rio_dev(kobj_to_dev(kobj));
umode_t mode = attr->mode;
if (!(rdev->pef & RIO_PEF_SWITCH) &&
(attr == &dev_attr_routes.attr ||
attr == &dev_attr_lnext.attr ||
attr == &dev_attr_hopcount.attr)) {
/*
* Hide switch-specific attributes for a non-switch device.
*/
mode = 0;
}
return mode;
}
static const struct attribute_group rio_dev_group = {
.attrs = rio_dev_attrs,
.is_visible = rio_dev_is_attr_visible,
.bin_attrs = rio_dev_bin_attrs,
};
const struct attribute_group *rio_dev_groups[] = {
&rio_dev_group,
NULL,
};
driver core: bus: mark the struct bus_type for sysfs callbacks as constant struct bus_type should never be modified in a sysfs callback as there is nothing in the structure to modify, and frankly, the structure is almost never used in a sysfs callback, so mark it as constant to allow struct bus_type to be moved to read-only memory. Cc: "David S. Miller" <davem@davemloft.net> Cc: "James E.J. Bottomley" <jejb@linux.ibm.com> Cc: "K. Y. Srinivasan" <kys@microsoft.com> Cc: Alexander Gordeev <agordeev@linux.ibm.com> Cc: Alexandre Bounine <alex.bou9@gmail.com> Cc: Alison Schofield <alison.schofield@intel.com> Cc: Ben Widawsky <bwidawsk@kernel.org> Cc: Dexuan Cui <decui@microsoft.com> Cc: Eric Dumazet <edumazet@google.com> Cc: Haiyang Zhang <haiyangz@microsoft.com> Cc: Hannes Reinecke <hare@suse.de> Cc: Harald Freudenberger <freude@linux.ibm.com> Cc: Heiko Carstens <hca@linux.ibm.com> Cc: Hu Haowen <src.res@email.cn> Cc: Jakub Kicinski <kuba@kernel.org> Cc: Jens Axboe <axboe@kernel.dk> Cc: Jonathan Corbet <corbet@lwn.net> Cc: Laurentiu Tudor <laurentiu.tudor@nxp.com> Cc: Matt Porter <mporter@kernel.crashing.org> Cc: Michael Ellerman <mpe@ellerman.id.au> Cc: Paolo Abeni <pabeni@redhat.com> Cc: Stuart Yoder <stuyoder@gmail.com> Cc: Vasily Gorbik <gor@linux.ibm.com> Cc: Vishal Verma <vishal.l.verma@intel.com> Cc: Yanteng Si <siyanteng@loongson.cn> Acked-by: Ilya Dryomov <idryomov@gmail.com> # rbd Acked-by: Ira Weiny <ira.weiny@intel.com> # cxl Reviewed-by: Alex Shi <alexs@kernel.org> Acked-by: Iwona Winiarska <iwona.winiarska@intel.com> Acked-by: Dan Williams <dan.j.williams@intel.com> Acked-by: Bjorn Helgaas <bhelgaas@google.com> # pci Acked-by: Wei Liu <wei.liu@kernel.org> Acked-by: Martin K. Petersen <martin.petersen@oracle.com> # scsi Link: https://lore.kernel.org/r/20230313182918.1312597-23-gregkh@linuxfoundation.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2023-03-13 18:29:05 +00:00
static ssize_t scan_store(const struct bus_type *bus, const char *buf, size_t count)
{
long val;
int rc;
if (kstrtol(buf, 0, &val) < 0)
return -EINVAL;
if (val == RIO_MPORT_ANY) {
rc = rio_init_mports();
goto exit;
}
if (val < 0 || val >= RIO_MAX_MPORTS)
return -EINVAL;
rapidio: update enumerator registration mechanism Update enumeration/discovery method registration mechanism to allow loading enumeration/discovery methods before all mports are registered. Existing statically linked RapidIO subsystem expects that all available RapidIO mport devices are initialized and registered before the enumeration/discovery method is registered. Switching to loadable mport device drivers creates situation when mport device driver can be loaded after enumeration/discovery method is attached (e.g., loadable mport driver in a system with statically linked RapidIO core and enumerator). This also will happen in a system with hot-pluggable RapidIO controllers. To remove the dependency on the initialization/registration order this patch introduces enumeration/discovery registration mechanism that supports arbitrary registration order of mports and enumerator/discovery methods. The following registration rules are implemented: - only one enumeration/discovery method can be registered for given mport ID (including RIO_MPORT_ANY); - when new enumeration/discovery methods tries to attach to the registered mport device, method with matching mport ID will replace a default method previously registered for given mport (if any); - enumeration/discovery method with target ID=RIO_MPORT_ANY will be attached only to mports that do not have another enumerator attached to them; - when new mport device is registered with RapidIO subsystem, registration routine searches for the enumeration/discovery method with the best matching mport ID; Signed-off-by: Alexandre Bounine <alexandre.bounine@idt.com> Cc: Matt Porter <mporter@kernel.crashing.org> Cc: Li Yang <leoli@freescale.com> Cc: Kumar Gala <galak@kernel.crashing.org> Cc: Andre van Herk <andre.van.herk@Prodrive.nl> Cc: Micha Nelissen <micha.nelissen@Prodrive.nl> Cc: Stef van Os <stef.van.os@Prodrive.nl> Cc: Jean Delvare <jdelvare@suse.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2013-07-03 22:08:53 +00:00
rc = rio_mport_scan((int)val);
exit:
if (!rc)
rc = count;
return rc;
}
static BUS_ATTR_WO(scan);
static struct attribute *rio_bus_attrs[] = {
&bus_attr_scan.attr,
NULL,
};
static const struct attribute_group rio_bus_group = {
.attrs = rio_bus_attrs,
};
const struct attribute_group *rio_bus_groups[] = {
&rio_bus_group,
NULL,
};
static ssize_t
port_destid_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct rio_mport *mport = to_rio_mport(dev);
if (mport)
return sprintf(buf, "0x%04x\n", mport->host_deviceid);
else
return -ENODEV;
}
static DEVICE_ATTR_RO(port_destid);
static ssize_t sys_size_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct rio_mport *mport = to_rio_mport(dev);
if (mport)
return sprintf(buf, "%u\n", mport->sys_size);
else
return -ENODEV;
}
static DEVICE_ATTR_RO(sys_size);
static struct attribute *rio_mport_attrs[] = {
&dev_attr_port_destid.attr,
&dev_attr_sys_size.attr,
NULL,
};
static const struct attribute_group rio_mport_group = {
.attrs = rio_mport_attrs,
};
const struct attribute_group *rio_mport_groups[] = {
&rio_mport_group,
NULL,
};