WSL2-Linux-Kernel/drivers/gpu/drm/drm_sysfs.c

411 строки
10 KiB
C
Исходник Обычный вид История

/*
* drm_sysfs.c - Modifications to drm_sysfs_class.c to support
* extra sysfs attribute from DRM. Normal drm_sysfs_class
* does not allow adding attributes.
*
* Copyright (c) 2004 Jon Smirl <jonsmirl@gmail.com>
* Copyright (c) 2003-2004 Greg Kroah-Hartman <greg@kroah.com>
* Copyright (c) 2003-2004 IBM Corp.
*
* This file is released under the GPLv2
*
*/
#include <linux/device.h>
#include <linux/kdev_t.h>
include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h percpu.h is included by sched.h and module.h and thus ends up being included when building most .c files. percpu.h includes slab.h which in turn includes gfp.h making everything defined by the two files universally available and complicating inclusion dependencies. percpu.h -> slab.h dependency is about to be removed. Prepare for this change by updating users of gfp and slab facilities include those headers directly instead of assuming availability. As this conversion needs to touch large number of source files, the following script is used as the basis of conversion. http://userweb.kernel.org/~tj/misc/slabh-sweep.py The script does the followings. * Scan files for gfp and slab usages and update includes such that only the necessary includes are there. ie. if only gfp is used, gfp.h, if slab is used, slab.h. * When the script inserts a new include, it looks at the include blocks and try to put the new include such that its order conforms to its surrounding. It's put in the include block which contains core kernel includes, in the same order that the rest are ordered - alphabetical, Christmas tree, rev-Xmas-tree or at the end if there doesn't seem to be any matching order. * If the script can't find a place to put a new include (mostly because the file doesn't have fitting include block), it prints out an error message indicating which .h file needs to be added to the file. The conversion was done in the following steps. 1. The initial automatic conversion of all .c files updated slightly over 4000 files, deleting around 700 includes and adding ~480 gfp.h and ~3000 slab.h inclusions. The script emitted errors for ~400 files. 2. Each error was manually checked. Some didn't need the inclusion, some needed manual addition while adding it to implementation .h or embedding .c file was more appropriate for others. This step added inclusions to around 150 files. 3. The script was run again and the output was compared to the edits from #2 to make sure no file was left behind. 4. Several build tests were done and a couple of problems were fixed. e.g. lib/decompress_*.c used malloc/free() wrappers around slab APIs requiring slab.h to be added manually. 5. The script was run on all .h files but without automatically editing them as sprinkling gfp.h and slab.h inclusions around .h files could easily lead to inclusion dependency hell. Most gfp.h inclusion directives were ignored as stuff from gfp.h was usually wildly available and often used in preprocessor macros. Each slab.h inclusion directive was examined and added manually as necessary. 6. percpu.h was updated not to include slab.h. 7. Build test were done on the following configurations and failures were fixed. CONFIG_GCOV_KERNEL was turned off for all tests (as my distributed build env didn't work with gcov compiles) and a few more options had to be turned off depending on archs to make things build (like ipr on powerpc/64 which failed due to missing writeq). * x86 and x86_64 UP and SMP allmodconfig and a custom test config. * powerpc and powerpc64 SMP allmodconfig * sparc and sparc64 SMP allmodconfig * ia64 SMP allmodconfig * s390 SMP allmodconfig * alpha SMP allmodconfig * um on x86_64 SMP allmodconfig 8. percpu.h modifications were reverted so that it could be applied as a separate patch and serve as bisection point. Given the fact that I had only a couple of failures from tests on step 6, I'm fairly confident about the coverage of this conversion patch. If there is a breakage, it's likely to be something in one of the arch headers which should be easily discoverable easily on most builds of the specific arch. Signed-off-by: Tejun Heo <tj@kernel.org> Guess-its-ok-by: Christoph Lameter <cl@linux-foundation.org> Cc: Ingo Molnar <mingo@redhat.com> Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
2010-03-24 11:04:11 +03:00
#include <linux/gfp.h>
#include <linux/err.h>
#include <linux/export.h>
#include <drm/drm_sysfs.h>
#include <drm/drmP.h>
#include "drm_internal.h"
#define to_drm_minor(d) dev_get_drvdata(d)
#define to_drm_connector(d) dev_get_drvdata(d)
static struct device_type drm_sysfs_device_minor = {
.name = "drm_minor"
};
struct class *drm_class;
static char *drm_devnode(struct device *dev, umode_t *mode)
{
return kasprintf(GFP_KERNEL, "dri/%s", dev_name(dev));
}
drm: drop obsolete drm_core.h The drm_core.h header contains a set of constants meant to be used throughout DRM. However, as it turns out, they're each used just once and don't bring any benefit. They're also grossly mis-named and lack name-spacing. This patch inlines them, or moves them into drm_internal.h as appropriate: - CORE_AUTHOR and CORE_DESC are inlined into corresponding MODULE_*() macros. It's just confusing having to follow 2 pointers when trying to find the definition of these fields. Grep'ping for MODULE_AUTHOR() should reveal the full information, if there's no strong reason not to. - CORE_NAME, CORE_DATE, CORE_MAJOR, CORE_MINOR, and CORE_PATCHLEVEL are inlined into the sysfs 'version' attribute. They're stripped everywhere else (which is just some printk() statements). CORE_NAME just doesn't make *any* sense, as we hard-code it in many places, anyway. The other constants are outdated and just serve binary-compatibility purposes. Hence, inline them in 'version' sysfs attribute (we might even try dropping it..). - DRM_IF_MAJOR and DRM_IF_MINOR are moved into drm_internal.h as they're only used by the global ioctl handlers. Furthermore, versioning interfaces breaks backports and as such is deprecated, anyway. We just keep them for historic reasons. I doubt anyone will ever modify them again. Signed-off-by: David Herrmann <dh.herrmann@gmail.com> Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch> Link: http://patchwork.freedesktop.org/patch/msgid/20160901124837.680-6-dh.herrmann@gmail.com
2016-09-01 15:48:36 +03:00
static CLASS_ATTR_STRING(version, S_IRUGO, "drm 1.1.0 20060810");
/**
* drm_sysfs_init - initialize sysfs helpers
*
* This is used to create the DRM class, which is the implicit parent of any
* other top-level DRM sysfs objects.
*
* You must call drm_sysfs_destroy() to release the allocated resources.
*
* Return: 0 on success, negative error code on failure.
*/
int drm_sysfs_init(void)
{
int err;
drm_class = class_create(THIS_MODULE, "drm");
if (IS_ERR(drm_class))
return PTR_ERR(drm_class);
err = class_create_file(drm_class, &class_attr_version.attr);
if (err) {
class_destroy(drm_class);
drm_class = NULL;
return err;
}
drm_class->devnode = drm_devnode;
return 0;
}
/**
* drm_sysfs_destroy - destroys DRM class
*
* Destroy the DRM device class.
*/
void drm_sysfs_destroy(void)
{
if (IS_ERR_OR_NULL(drm_class))
return;
class_remove_file(drm_class, &class_attr_version.attr);
class_destroy(drm_class);
drm_class = NULL;
}
/*
* Connector properties
*/
static ssize_t status_store(struct device *device,
struct device_attribute *attr,
const char *buf, size_t count)
{
struct drm_connector *connector = to_drm_connector(device);
struct drm_device *dev = connector->dev;
enum drm_connector_force old_force;
drm: Hold the mode mutex whilst probing for sysfs status As detect will use hw registers and may modify structures, it needs to be serialised by use of the dev->mode_config.mutex. Make it so. Otherwise, we may cause random crashes as the sysfs file is queried whilst a concurrent hotplug poll is being run. For example: [ 1189.189626] BUG: unable to handle kernel NULL pointer dereference at 00000100 [ 1189.189821] IP: [<e0c22019>] intel_tv_detect_type+0xa2/0x203 [i915] [ 1189.190020] *pde = 00000000 [ 1189.190104] Oops: 0000 [#1] SMP [ 1189.190209] last sysfs file: /sys/devices/pci0000:00/0000:00:02.0/drm/card0/card0-SVIDEO-1/status [ 1189.190412] Modules linked in: mperf cpufreq_conservative cpufreq_userspace cpufreq_powersave cpufreq_stats decnet uinput fuse loop joydev snd_hd a_codec_realtek snd_hda_intel snd_hda_codec snd_hwdep snd_pcm_oss snd_mixer_oss snd_pcm i915 snd_seq_midi snd_rawmidi snd_seq_midi_event snd_seq drm_kms_helper snd_timer uvcvideo d rm snd_seq_device eeepc_laptop tpm_tis usbhid videodev i2c_algo_bit v4l1_compat snd sparse_keymap i2c_core hid serio_raw tpm psmouse evdev tpm_bios rfkill shpchp ac processor rng_c ore battery video power_supply soundcore pci_hotplug button output snd_page_alloc usb_storage uas ext3 jbd mbcache sd_mod crc_t10dif ata_generic ahci libahci ata_piix libata uhci_h cd ehci_hcd scsi_mod usbcore thermal atl2 thermal_sys nls_base [last unloaded: scsi_wait_scan] [ 1189.192007] [ 1189.192007] Pid: 1464, comm: upowerd Not tainted 2.6.37-2-686 #1 ASUSTeK Computer INC. 701/701 [ 1189.192007] EIP: 0060:[<e0c22019>] EFLAGS: 00010246 CPU: 0 [ 1189.192007] EIP is at intel_tv_detect_type+0xa2/0x203 [i915] [ 1189.192007] EAX: 00000000 EBX: dca74000 ECX: e0f68004 EDX: 00068004 [ 1189.192007] ESI: dd110c00 EDI: 400c0c37 EBP: dca7429c ESP: de365e2c [ 1189.192007] DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068 [ 1189.192007] Process upowerd (pid: 1464, ti=de364000 task=dcc8acb0 task.ti=de364000) [ 1189.192007] Stack: Mar 15 03:43:23 hostname kernel: [ 1189.192007] e0c2cda4 70000000 400c0c30 00000000 dd111000 de365e54 de365f24 dd110c00 [ 1189.192007] e0c22203 01000000 00000003 00000000 00000000 00000000 00000000 4353544e [ 1189.192007] 30383420 00000069 00000000 00000000 00000000 00000000 00000000 00000000 [ 1189.192007] Call Trace: Mar 15 03:43:23 hostname kernel: [ 1189.192007] [<e0c22203>] ? intel_tv_detect+0x89/0x12d [i915] [ 1189.192007] [<e0a9dcef>] ? status_show+0x0/0x2f [drm] [ 1189.192007] [<e0a9dd03>] ? status_show+0x14/0x2f [drm] [Digression: what is upowerd doing reading those power hungry files?] Reported-by: Paul Menzel <paulepanter@users.sourceforge.net> Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Cc: stable@kernel.org Signed-off-by: Dave Airlie <airlied@redhat.com>
2011-03-15 14:40:00 +03:00
int ret;
ret = mutex_lock_interruptible(&dev->mode_config.mutex);
drm: Hold the mode mutex whilst probing for sysfs status As detect will use hw registers and may modify structures, it needs to be serialised by use of the dev->mode_config.mutex. Make it so. Otherwise, we may cause random crashes as the sysfs file is queried whilst a concurrent hotplug poll is being run. For example: [ 1189.189626] BUG: unable to handle kernel NULL pointer dereference at 00000100 [ 1189.189821] IP: [<e0c22019>] intel_tv_detect_type+0xa2/0x203 [i915] [ 1189.190020] *pde = 00000000 [ 1189.190104] Oops: 0000 [#1] SMP [ 1189.190209] last sysfs file: /sys/devices/pci0000:00/0000:00:02.0/drm/card0/card0-SVIDEO-1/status [ 1189.190412] Modules linked in: mperf cpufreq_conservative cpufreq_userspace cpufreq_powersave cpufreq_stats decnet uinput fuse loop joydev snd_hd a_codec_realtek snd_hda_intel snd_hda_codec snd_hwdep snd_pcm_oss snd_mixer_oss snd_pcm i915 snd_seq_midi snd_rawmidi snd_seq_midi_event snd_seq drm_kms_helper snd_timer uvcvideo d rm snd_seq_device eeepc_laptop tpm_tis usbhid videodev i2c_algo_bit v4l1_compat snd sparse_keymap i2c_core hid serio_raw tpm psmouse evdev tpm_bios rfkill shpchp ac processor rng_c ore battery video power_supply soundcore pci_hotplug button output snd_page_alloc usb_storage uas ext3 jbd mbcache sd_mod crc_t10dif ata_generic ahci libahci ata_piix libata uhci_h cd ehci_hcd scsi_mod usbcore thermal atl2 thermal_sys nls_base [last unloaded: scsi_wait_scan] [ 1189.192007] [ 1189.192007] Pid: 1464, comm: upowerd Not tainted 2.6.37-2-686 #1 ASUSTeK Computer INC. 701/701 [ 1189.192007] EIP: 0060:[<e0c22019>] EFLAGS: 00010246 CPU: 0 [ 1189.192007] EIP is at intel_tv_detect_type+0xa2/0x203 [i915] [ 1189.192007] EAX: 00000000 EBX: dca74000 ECX: e0f68004 EDX: 00068004 [ 1189.192007] ESI: dd110c00 EDI: 400c0c37 EBP: dca7429c ESP: de365e2c [ 1189.192007] DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068 [ 1189.192007] Process upowerd (pid: 1464, ti=de364000 task=dcc8acb0 task.ti=de364000) [ 1189.192007] Stack: Mar 15 03:43:23 hostname kernel: [ 1189.192007] e0c2cda4 70000000 400c0c30 00000000 dd111000 de365e54 de365f24 dd110c00 [ 1189.192007] e0c22203 01000000 00000003 00000000 00000000 00000000 00000000 4353544e [ 1189.192007] 30383420 00000069 00000000 00000000 00000000 00000000 00000000 00000000 [ 1189.192007] Call Trace: Mar 15 03:43:23 hostname kernel: [ 1189.192007] [<e0c22203>] ? intel_tv_detect+0x89/0x12d [i915] [ 1189.192007] [<e0a9dcef>] ? status_show+0x0/0x2f [drm] [ 1189.192007] [<e0a9dd03>] ? status_show+0x14/0x2f [drm] [Digression: what is upowerd doing reading those power hungry files?] Reported-by: Paul Menzel <paulepanter@users.sourceforge.net> Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Cc: stable@kernel.org Signed-off-by: Dave Airlie <airlied@redhat.com>
2011-03-15 14:40:00 +03:00
if (ret)
return ret;
old_force = connector->force;
if (sysfs_streq(buf, "detect"))
connector->force = 0;
else if (sysfs_streq(buf, "on"))
connector->force = DRM_FORCE_ON;
else if (sysfs_streq(buf, "on-digital"))
connector->force = DRM_FORCE_ON_DIGITAL;
else if (sysfs_streq(buf, "off"))
connector->force = DRM_FORCE_OFF;
else
ret = -EINVAL;
if (old_force != connector->force || !connector->force) {
DRM_DEBUG_KMS("[CONNECTOR:%d:%s] force updated from %d to %d or reprobing\n",
connector->base.id,
connector->name,
old_force, connector->force);
connector->funcs->fill_modes(connector,
dev->mode_config.max_width,
dev->mode_config.max_height);
}
mutex_unlock(&dev->mode_config.mutex);
return ret ? ret : count;
}
static ssize_t status_show(struct device *device,
struct device_attribute *attr,
char *buf)
{
struct drm_connector *connector = to_drm_connector(device);
enum drm_connector_status status;
status = READ_ONCE(connector->status);
drm: Hold the mode mutex whilst probing for sysfs status As detect will use hw registers and may modify structures, it needs to be serialised by use of the dev->mode_config.mutex. Make it so. Otherwise, we may cause random crashes as the sysfs file is queried whilst a concurrent hotplug poll is being run. For example: [ 1189.189626] BUG: unable to handle kernel NULL pointer dereference at 00000100 [ 1189.189821] IP: [<e0c22019>] intel_tv_detect_type+0xa2/0x203 [i915] [ 1189.190020] *pde = 00000000 [ 1189.190104] Oops: 0000 [#1] SMP [ 1189.190209] last sysfs file: /sys/devices/pci0000:00/0000:00:02.0/drm/card0/card0-SVIDEO-1/status [ 1189.190412] Modules linked in: mperf cpufreq_conservative cpufreq_userspace cpufreq_powersave cpufreq_stats decnet uinput fuse loop joydev snd_hd a_codec_realtek snd_hda_intel snd_hda_codec snd_hwdep snd_pcm_oss snd_mixer_oss snd_pcm i915 snd_seq_midi snd_rawmidi snd_seq_midi_event snd_seq drm_kms_helper snd_timer uvcvideo d rm snd_seq_device eeepc_laptop tpm_tis usbhid videodev i2c_algo_bit v4l1_compat snd sparse_keymap i2c_core hid serio_raw tpm psmouse evdev tpm_bios rfkill shpchp ac processor rng_c ore battery video power_supply soundcore pci_hotplug button output snd_page_alloc usb_storage uas ext3 jbd mbcache sd_mod crc_t10dif ata_generic ahci libahci ata_piix libata uhci_h cd ehci_hcd scsi_mod usbcore thermal atl2 thermal_sys nls_base [last unloaded: scsi_wait_scan] [ 1189.192007] [ 1189.192007] Pid: 1464, comm: upowerd Not tainted 2.6.37-2-686 #1 ASUSTeK Computer INC. 701/701 [ 1189.192007] EIP: 0060:[<e0c22019>] EFLAGS: 00010246 CPU: 0 [ 1189.192007] EIP is at intel_tv_detect_type+0xa2/0x203 [i915] [ 1189.192007] EAX: 00000000 EBX: dca74000 ECX: e0f68004 EDX: 00068004 [ 1189.192007] ESI: dd110c00 EDI: 400c0c37 EBP: dca7429c ESP: de365e2c [ 1189.192007] DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068 [ 1189.192007] Process upowerd (pid: 1464, ti=de364000 task=dcc8acb0 task.ti=de364000) [ 1189.192007] Stack: Mar 15 03:43:23 hostname kernel: [ 1189.192007] e0c2cda4 70000000 400c0c30 00000000 dd111000 de365e54 de365f24 dd110c00 [ 1189.192007] e0c22203 01000000 00000003 00000000 00000000 00000000 00000000 4353544e [ 1189.192007] 30383420 00000069 00000000 00000000 00000000 00000000 00000000 00000000 [ 1189.192007] Call Trace: Mar 15 03:43:23 hostname kernel: [ 1189.192007] [<e0c22203>] ? intel_tv_detect+0x89/0x12d [i915] [ 1189.192007] [<e0a9dcef>] ? status_show+0x0/0x2f [drm] [ 1189.192007] [<e0a9dd03>] ? status_show+0x14/0x2f [drm] [Digression: what is upowerd doing reading those power hungry files?] Reported-by: Paul Menzel <paulepanter@users.sourceforge.net> Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Cc: stable@kernel.org Signed-off-by: Dave Airlie <airlied@redhat.com>
2011-03-15 14:40:00 +03:00
return snprintf(buf, PAGE_SIZE, "%s\n",
drm_get_connector_status_name(status));
}
static ssize_t dpms_show(struct device *device,
struct device_attribute *attr,
char *buf)
{
struct drm_connector *connector = to_drm_connector(device);
int dpms;
dpms = READ_ONCE(connector->dpms);
return snprintf(buf, PAGE_SIZE, "%s\n",
drm_get_dpms_name(dpms));
}
static ssize_t enabled_show(struct device *device,
struct device_attribute *attr,
char *buf)
{
struct drm_connector *connector = to_drm_connector(device);
bool enabled;
enabled = READ_ONCE(connector->encoder);
return snprintf(buf, PAGE_SIZE, enabled ? "enabled\n" : "disabled\n");
}
static ssize_t edid_show(struct file *filp, struct kobject *kobj,
struct bin_attribute *attr, char *buf, loff_t off,
size_t count)
{
struct device *connector_dev = kobj_to_dev(kobj);
struct drm_connector *connector = to_drm_connector(connector_dev);
unsigned char *edid;
size_t size;
ssize_t ret = 0;
mutex_lock(&connector->dev->mode_config.mutex);
if (!connector->edid_blob_ptr)
goto unlock;
edid = connector->edid_blob_ptr->data;
size = connector->edid_blob_ptr->length;
if (!edid)
goto unlock;
if (off >= size)
goto unlock;
if (off + count > size)
count = size - off;
memcpy(buf, edid + off, count);
ret = count;
unlock:
mutex_unlock(&connector->dev->mode_config.mutex);
return ret;
}
static ssize_t modes_show(struct device *device,
struct device_attribute *attr,
char *buf)
{
struct drm_connector *connector = to_drm_connector(device);
struct drm_display_mode *mode;
int written = 0;
mutex_lock(&connector->dev->mode_config.mutex);
list_for_each_entry(mode, &connector->modes, head) {
written += snprintf(buf + written, PAGE_SIZE - written, "%s\n",
mode->name);
}
mutex_unlock(&connector->dev->mode_config.mutex);
return written;
}
static DEVICE_ATTR_RW(status);
static DEVICE_ATTR_RO(enabled);
static DEVICE_ATTR_RO(dpms);
static DEVICE_ATTR_RO(modes);
static struct attribute *connector_dev_attrs[] = {
&dev_attr_status.attr,
&dev_attr_enabled.attr,
&dev_attr_dpms.attr,
&dev_attr_modes.attr,
NULL
};
static struct bin_attribute edid_attr = {
.attr.name = "edid",
.attr.mode = 0444,
.size = 0,
.read = edid_show,
};
static struct bin_attribute *connector_bin_attrs[] = {
&edid_attr,
NULL
};
static const struct attribute_group connector_dev_group = {
.attrs = connector_dev_attrs,
.bin_attrs = connector_bin_attrs,
};
static const struct attribute_group *connector_dev_groups[] = {
&connector_dev_group,
NULL
};
/**
* drm_sysfs_connector_add - add a connector to sysfs
* @connector: connector to add
*
* Create a connector device in sysfs, along with its associated connector
* properties (so far, connection status, dpms, mode list & edid) and
* generate a hotplug event so userspace knows there's a new connector
* available.
*/
int drm_sysfs_connector_add(struct drm_connector *connector)
{
struct drm_device *dev = connector->dev;
if (connector->kdev)
return 0;
connector->kdev =
device_create_with_groups(drm_class, dev->primary->kdev, 0,
connector, connector_dev_groups,
"card%d-%s", dev->primary->index,
connector->name);
DRM_DEBUG("adding \"%s\" to sysfs\n",
connector->name);
if (IS_ERR(connector->kdev)) {
DRM_ERROR("failed to register connector device: %ld\n", PTR_ERR(connector->kdev));
return PTR_ERR(connector->kdev);
}
/* Let userspace know we have a new connector */
drm_sysfs_hotplug_event(dev);
return 0;
}
/**
* drm_sysfs_connector_remove - remove an connector device from sysfs
* @connector: connector to remove
*
* Remove @connector and its associated attributes from sysfs. Note that
* the device model core will take care of sending the "remove" uevent
* at this time, so we don't need to do it.
*
* Note:
* This routine should only be called if the connector was previously
* successfully registered. If @connector hasn't been registered yet,
* you'll likely see a panic somewhere deep in sysfs code when called.
*/
void drm_sysfs_connector_remove(struct drm_connector *connector)
{
if (!connector->kdev)
return;
DRM_DEBUG("removing \"%s\" from sysfs\n",
connector->name);
device_unregister(connector->kdev);
connector->kdev = NULL;
}
/**
* drm_sysfs_hotplug_event - generate a DRM uevent
* @dev: DRM device
*
* Send a uevent for the DRM device specified by @dev. Currently we only
* set HOTPLUG=1 in the uevent environment, but this could be expanded to
* deal with other types of events.
*/
void drm_sysfs_hotplug_event(struct drm_device *dev)
{
char *event_string = "HOTPLUG=1";
char *envp[] = { event_string, NULL };
DRM_DEBUG("generating hotplug event\n");
kobject_uevent_env(&dev->primary->kdev->kobj, KOBJ_CHANGE, envp);
}
EXPORT_SYMBOL(drm_sysfs_hotplug_event);
static void drm_sysfs_release(struct device *dev)
{
kfree(dev);
}
/**
* drm_sysfs_minor_alloc() - Allocate sysfs device for given minor
* @minor: minor to allocate sysfs device for
*
* This allocates a new sysfs device for @minor and returns it. The device is
* not registered nor linked. The caller has to use device_add() and
* device_del() to register and unregister it.
*
* Note that dev_get_drvdata() on the new device will return the minor.
* However, the device does not hold a ref-count to the minor nor to the
* underlying drm_device. This is unproblematic as long as you access the
* private data only in sysfs callbacks. device_del() disables those
* synchronously, so they cannot be called after you cleanup a minor.
*/
struct device *drm_sysfs_minor_alloc(struct drm_minor *minor)
{
const char *minor_str;
struct device *kdev;
int r;
if (minor->type == DRM_MINOR_CONTROL)
minor_str = "controlD%d";
else if (minor->type == DRM_MINOR_RENDER)
minor_str = "renderD%d";
else
minor_str = "card%d";
kdev = kzalloc(sizeof(*kdev), GFP_KERNEL);
if (!kdev)
return ERR_PTR(-ENOMEM);
device_initialize(kdev);
kdev->devt = MKDEV(DRM_MAJOR, minor->index);
kdev->class = drm_class;
kdev->type = &drm_sysfs_device_minor;
kdev->parent = minor->dev->dev;
kdev->release = drm_sysfs_release;
dev_set_drvdata(kdev, minor);
r = dev_set_name(kdev, minor_str, minor->index);
if (r < 0)
goto err_free;
return kdev;
err_free:
put_device(kdev);
return ERR_PTR(r);
}
/**
* drm_class_device_register - Register a struct device in the drm class.
*
* @dev: pointer to struct device to register.
*
* @dev should have all relevant members pre-filled with the exception
* of the class member. In particular, the device_type member must
* be set.
*/
int drm_class_device_register(struct device *dev)
{
if (!drm_class || IS_ERR(drm_class))
return -ENOENT;
dev->class = drm_class;
return device_register(dev);
}
EXPORT_SYMBOL_GPL(drm_class_device_register);
void drm_class_device_unregister(struct device *dev)
{
return device_unregister(dev);
}
EXPORT_SYMBOL_GPL(drm_class_device_unregister);