From mboxrd@z Thu Jan 1 00:00:00 1970 From: Chris Wilson Subject: Re: [PATCH v4] drm/i915: rc6 in sysfs Date: Wed, 11 Apr 2012 09:14:43 +0100 Message-ID: <1334132085_361270@CP5-2952> References: <1334117821-26481-1-git-send-email-ben@bwidawsk.net> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: Received: from fireflyinternet.com (smtp.fireflyinternet.com [109.228.6.236]) by gabe.freedesktop.org (Postfix) with ESMTP id DE7969E734 for ; Wed, 11 Apr 2012 01:15:03 -0700 (PDT) In-Reply-To: <1334117821-26481-1-git-send-email-ben@bwidawsk.net> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: intel-gfx-bounces+gcfxdi-intel-gfx=m.gmane.org@lists.freedesktop.org Errors-To: intel-gfx-bounces+gcfxdi-intel-gfx=m.gmane.org@lists.freedesktop.org To: intel-gfx@lists.freedesktop.org Cc: Daniel Vetter , Ben Widawsky , f@chad-versace.us, Arjan van de Ven , Ben Widawsky List-Id: intel-gfx@lists.freedesktop.org On Tue, 10 Apr 2012 21:17:01 -0700, Ben Widawsky wrote: > Merge rc6 information into the power group for our device. Until now the > i915 driver has not had any sysfs entries (aside from the connector > stuff enabled by drm core). Since it seems like we're likely to have > more in the future I created a new file for sysfs stubs, as well as the > rc6 sysfs functions which don't really belong elsewhere (perhaps > i915_suspend, but most of the stuff is in intel_display,c). > > displays rc6 modes enabled (as a hex mask): > cat /sys/class/drm/card0/power/rc6_enable > > displays #ms GPU has been in rc6 since boot: > cat /sys/class/drm/card0/power/rc6_residency_ms > > displays #ms GPU has been in deep rc6 since boot: > cat /sys/class/drm/card0/power/rc6p_residency_ms > > displays #ms GPU has been in deepest rc6 since boot: > cat /sys/class/drm/card0/power/rc6pp_residency_ms > > Important note: I've seen on SNB that even when RC6 is *not* enabled the > rc6 register seems to have a random value in it. I can only guess at the > reason reason for this. Those writing tools that utilize this value need > to be careful and probably want to scrutinize the value very carefully. > > v2: use common rc6 residency units to milliseconds for the other RC6 types > > v3: don't create sysfs files for GEN <= 5 > add a rc6_enable to show a mask of enabled rc6 types > use unmerge instead of remove for sysfs group > squash intel_enable_rc6() extraction into this patch > > v4: rename sysfs files (Chris) > > CC: Chris Wilson > CC: Daniel Vetter f > CC: Arjan van de Ven > Signed-off-by: Ben Widawsky So the only downside to using the pre-existing power group is that we do not get the interface if power-management is compiled out of the kernel, which I suppose is appropriate. I'm down to just bikeshedding over useless lines of code which do not even add visual clarity... Reviewed-by: Chris Wilson -Chris -- Chris Wilson, Intel Open Source Technology Centre