Re: [igt-dev] [Patch][i-g-t 2/2] tests/kms_content_protection: Use library functions for handling uevents

[Anshuman Gupta <anshuman.gupta@intel.com>]

On 2020-06-16 at 19:33:04 +0530, Ramalingam C wrote:
> On 2020-06-16 at 16:28:12 +0530, Ankit Nautiyal wrote:
> > Currently, the test has its own version of uevent handling used
> > for detecting hdcp events. This patch modifies the test to use
> > the igt_kms lib support for handling the uevent monitor and detect
> > hdcp events.
> > 
> > Signed-off-by: Ankit Nautiyal <ankit.k.nautiyal@intel.com>
> > ---
> >  tests/kms_content_protection.c | 145 ++-------------------------------
> >  1 file changed, 6 insertions(+), 139 deletions(-)
> > 
> > diff --git a/tests/kms_content_protection.c b/tests/kms_content_protection.c
> > index 3b9cedcb..475a5089 100644
> > --- a/tests/kms_content_protection.c
> > +++ b/tests/kms_content_protection.c
> > @@ -39,6 +39,7 @@ struct data {
> >  	igt_display_t display;
> >  	struct igt_fb red, green;
> >  	unsigned int cp_tests;
> > +	struct udev_monitor *uevent_monitor;
> >  } data;
> >  
> >  /* Test flags */
> > @@ -112,143 +113,6 @@ static int wait_flip_event(void)
> >  	return rc;
> >  }
> >  
> > -static bool hdcp_event(struct udev_monitor *uevent_monitor,
> > -		       struct udev *udev, uint32_t conn_id, uint32_t prop_id)
> > -{
> > -	struct udev_device *dev;
> > -	dev_t udev_devnum;
> > -	struct stat s;
> > -	const char *hotplug, *connector, *property;
> > -	bool ret = false;
> > -
> > -	dev = udev_monitor_receive_device(uevent_monitor);
> > -	if (!dev)
> > -		goto out;
> > -
> > -	udev_devnum = udev_device_get_devnum(dev);
> > -	fstat(data.display.drm_fd, &s);
> > -
> > -	hotplug = udev_device_get_property_value(dev, "HOTPLUG");
> > -	if (!(memcmp(&s.st_rdev, &udev_devnum, sizeof(dev_t)) == 0 &&
> > -	    hotplug && atoi(hotplug) == 1)) {
> > -		igt_debug("Not a Hotplug event\n");
> > -		goto out_dev;
> > -	}
> > -
> > -	connector = udev_device_get_property_value(dev, "CONNECTOR");
> > -	if (!(memcmp(&s.st_rdev, &udev_devnum, sizeof(dev_t)) == 0 &&
> > -	    connector && atoi(connector) == conn_id)) {
> > -		igt_debug("Not for connector id: %u\n", conn_id);
> > -		goto out_dev;
> > -	}
> > -
> > -	property = udev_device_get_property_value(dev, "PROPERTY");
> > -	if (!(memcmp(&s.st_rdev, &udev_devnum, sizeof(dev_t)) == 0 &&
> > -	    property && atoi(property) == prop_id)) {
> > -		igt_debug("Not for property id: %u\n", prop_id);
> > -		goto out_dev;
> > -	}
> > -	ret = true;
> > -
> > -out_dev:
> > -	udev_device_unref(dev);
> > -out:
> > -	return ret;
> > -}
> > -
> > -static void hdcp_udev_fini(struct udev_monitor *uevent_monitor,
> > -			   struct udev *udev)
> > -{
> > -	if (uevent_monitor)
> > -		udev_monitor_unref(uevent_monitor);
> > -	if (udev)
> > -		udev_unref(udev);
> > -}
> > -
> > -static int hdcp_udev_init(struct udev_monitor **uevent_monitor,
> > -			  struct udev **udev, int *udev_fd)
> > -{
> > -	int ret = -EINVAL;
> > -
> > -	*udev = udev_new();
> > -	if (!*udev) {
> > -		igt_info("failed to create udev object\n");
> > -		goto out;
> > -	}
> > -
> > -	*uevent_monitor = udev_monitor_new_from_netlink(*udev, "udev");
> > -	if (!*uevent_monitor) {
> > -		igt_info("failed to create udev event monitor\n");
> > -		goto out;
> > -	}
> > -
> > -	ret = udev_monitor_filter_add_match_subsystem_devtype(*uevent_monitor,
> > -							      "drm",
> > -							      "drm_minor");
> > -	if (ret < 0) {
> > -		igt_info("failed to filter for drm events\n");
> > -		goto out;
> > -	}
> > -
> > -	ret = udev_monitor_enable_receiving(*uevent_monitor);
> > -	if (ret < 0) {
> > -		igt_info("failed to enable udev event reception\n");
> > -		goto out;
> > -	}
> > -
> > -	*udev_fd = udev_monitor_get_fd(*uevent_monitor);
> > -	if (*udev_fd < 0) {
> > -		igt_info("failed to get udev_fd on uevent monitor\n");
> > -		ret = *udev_fd;
> > -		goto out;
> > -	}
> > -
> > -	return ret;
> > -
> > -out:
> > -	hdcp_udev_fini(*uevent_monitor, *udev);
> > -	return ret;
> > -}
> > -
> > -#define MAX_EVENTS	10
> > -static bool wait_for_hdcp_event(uint32_t conn_id, uint32_t prop_id,
> > -				uint32_t timeout_mSec)
> > -{
> > -
> > -	struct udev_monitor *uevent_monitor = NULL;
> > -	struct udev *udev = NULL;
> > -	int udev_fd, epoll_fd;
> > -	struct epoll_event event, events[MAX_EVENTS];
> > -	bool ret = false;
> > -
> > -	if (hdcp_udev_init(&uevent_monitor, &udev, &udev_fd) < 0)
> > -		return false;
> > -
> > -	epoll_fd = epoll_create1(0);
> > -	if (epoll_fd == -1) {
> > -		igt_info("Failed to create epoll fd. %d\n", epoll_fd);
> > -		goto out_ep_create;
> > -	}
> > -
> > -	event.events = EPOLLIN | EPOLLERR;
> > -	event.data.fd = 0;
> > -
> > -	if (epoll_ctl(epoll_fd, EPOLL_CTL_ADD, udev_fd, &event)) {
> > -		igt_info("failed to fd into epoll\n");
> > -		goto out_ep_ctl;
> > -	}
> > -
> > -	if (epoll_wait(epoll_fd, events, MAX_EVENTS, timeout_mSec))
> > -		ret = hdcp_event(uevent_monitor, udev, conn_id, prop_id);
> > -
> > -out_ep_ctl:
> > -	if (close(epoll_fd))
> > -		igt_info("failed to close the epoll fd\n");
> > -out_ep_create:
> > -	hdcp_udev_fini(uevent_monitor, udev);
> > -	return ret;
> > -}
> > -
> >  static bool
> >  wait_for_prop_value(igt_output_t *output, uint64_t expected,
> >  		    uint32_t timeout_mSec)
> > @@ -257,9 +121,9 @@ wait_for_prop_value(igt_output_t *output, uint64_t expected,
> >  	int i;
> >  
> >  	if (data.cp_tests & CP_UEVENT && expected != CP_UNDESIRED) {
> > -		igt_assert_f(wait_for_hdcp_event(output->id,
> > +		igt_assert_f(igt_conn_event_detected(data.uevent_monitor, output->id,
> >  			     output->props[IGT_CONNECTOR_CONTENT_PROTECTION],
> > -			     timeout_mSec), "uevent is not received");
> > +			     timeout_mSec / 1000), "uevent is not received");
> >  
> >  		val = igt_output_get_prop(output,
> >  					  IGT_CONNECTOR_CONTENT_PROTECTION);
> > @@ -702,7 +566,10 @@ igt_main
> >  	igt_subtest("uevent") {
> >  		igt_require(data.display.is_atomic);
> >  		data.cp_tests = CP_UEVENT;
> > +		data.uevent_monitor = igt_watch_hotplug();
> Ankit, this is really good.
> 
> Any benefit with sporadic hdcp event missing issue?
yes there is absolute benifit wait_for_hdcp_event() every times
prepare a necessary infrasture before triggering epoll_wait().
Sometimes due to scheduling delays connector HOTPLUG events get disposed 
even before a call to epoll_wait() here.
Many thanks to Arek here for debugging inputs by "udev monitor".
> 
> I would prefer to create generic implementations like igt_watch_udev.
> Similarly for igt_flush_hotplugs and igt_cleanup_hotplug.
There are two calls from kerenl for HOTPLUG uevent.
drm_sysfs_hotplug_event -> for HOTPLUG events only with HOTPLUG=1 string
drm_sysfs_connector_status_event-> for HOTPLUG events with additional
connector id and prop id string. so i belive in line to that there 
is no need to change existing API name change.
Probably igt_conn_event_detected can be changed to 
igt_connector_hotplug_detected or igt_connector_event_detected for more
readability.
Thanks,
Anshuman Gupta.
> 
> -Ram.
> > +		igt_flush_hotplugs(data.uevent_monitor);
> >  		test_content_protection(COMMIT_ATOMIC, HDCP_CONTENT_TYPE_0);
> > +		igt_cleanup_hotplug(data.uevent_monitor);
> >  	}
> >  
> >  	/*
> > -- 
> > 2.17.1
> > 
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