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Jani Nikula [Tue, 1 Dec 2015 14:29:26 +0000 (16:29 +0200)]
drm/i915: abstract i2c bit banging fallback in gmbus xfer
Choose between i2c bit banging and gmbus in a new higher level function,
and let the i2c core retry the first time we fall back to bit banging.
The i2c core imposes a timeout on -EAGAIN, but it defaults to 1 second,
and shouldn't be a problem for us.
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1448980166-23055-2-git-send-email-jani.nikula@intel.com
Jani Nikula [Tue, 1 Dec 2015 14:29:25 +0000 (16:29 +0200)]
drm/i915: simplify gmbus xfer error checks
Shorter, easier to follow code with no functional changes. In all cases,
the return value ultimately comes from gmbus_wait_hw_status() anyway.
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1448980166-23055-1-git-send-email-jani.nikula@intel.com
Ville Syrjälä [Tue, 1 Dec 2015 21:32:07 +0000 (23:32 +0200)]
drm/i915: Add "missing" break to haswell_get_ddi_pll()
While not technically needed on the last case in the switch statement,
the 'break' makes it look better IMO.
v2: Fixed a typo in the commit message (Paulo)
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1449005527-15617-1-git-send-email-ville.syrjala@linux.intel.com
Ville Syrjälä [Tue, 1 Dec 2015 21:31:33 +0000 (23:31 +0200)]
drm/i915: Check VBT for CRT port presence on HSW/BDW
Unfortunatey there appear to quite a few HSW/BDW machines (eg.
NUCs, Brix Pro) in the wild with LPT/WPT-H that have no physical
CRT connector and non-working FDI. FDI training fails every
single time on these machines. Dunno, maybe they just didn't
bother wiring it up or something?
Unfortunately all the fuse bits and whatnot are telling us that
the CRT connector is present. And so what we get from this is tons
of false positives from the CI systems due to VGA connector forcing.
I've not found any way to detect this purely from hardware, so we
have to resort to looking at the VBT int_crt_support bit. We used
to check this bit on all platforms, but that broke all the old
machines, so the check was then restricted to VLV only in
commit
84b4e042c470 ("drm/i915: only apply crt_present check on VLV")
Considering HSW and VLV VBT probably got defined around the same time,
it should be reasonably safe to assume that the bits is sane for
HSW/BDW as well. At least I have one copy of some VBT spec here that
says it's meant for both VLV and HSW, and it knows about the bit
(lists it being valid from version 155 onwards). Also I have two
desktop machines with actual CRT ports and both have
int_crt_support==1 in their VBTs.
Also we already trust VBT >= 155 to tell us various details about
the DDI ports, so trusting it a bit more seems reasonable.
As far as VLV goes, the added VBT version check should be fine. Even
if someone has some weird VLV machine with a very old VBT version,
it just means they'll end up with a shadow CRT connector. IIRC the
reason for eliminating the shadow CRT connector on VLV was to speed
up display probing rather than fixing something more serious.
v2: Move the platform checks into the VBT parsing code
Also check that the VBT version is at least 155
v3: Improve commit message (Paulo)
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1449005493-15487-1-git-send-email-ville.syrjala@linux.intel.com
Ville Syrjälä [Tue, 1 Dec 2015 21:29:56 +0000 (23:29 +0200)]
drm/i915: Don't register CRT connector when DDI E can't be used
On HSW/BDW DDI A and E share 2 lanes, so when DDI A requires the
shared lanes DDI E can't be used. The lanes are not supposed to
be dynamically switched between the two uses, so there's no point
in registering the CRT connector when DDI E has no lanes.
v2: Fix typos in the commit message (Paulo)
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1449005396-15319-1-git-send-email-ville.syrjala@linux.intel.com
Ville Syrjälä [Tue, 1 Dec 2015 21:28:55 +0000 (23:28 +0200)]
drm/i915: Don't register the CRT connector when it's fused off on LPT-H
LPT-H has a strap bit for fused off CRT block. Check it to see if
we should register the CRT connector or not. Supposedly this also
forces the ADAP enable bit to 0, so the detection we added in
commit
6c03a6bd0dd8 ("drm/i915: Don't register CRT connector when it's fused off")
should already catch it, but checking the fuse bit should at least
do no harm.
v2: Use HAS_PCH_LPT_H() (Paulo)
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1449005335-15192-1-git-send-email-ville.syrjala@linux.intel.com
Ville Syrjälä [Mon, 30 Nov 2015 14:23:47 +0000 (16:23 +0200)]
drm/i915: Use cached cdclk_freq for PWM calculations
No need to read out cdclk from the hardware, we have it already
cached in dev_priv.
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1448893432-6978-7-git-send-email-ville.syrjala@linux.intel.com
Reviewed-by: Jani Nikula <jani.nikula@intel.com>
Ville Syrjälä [Mon, 30 Nov 2015 14:23:46 +0000 (16:23 +0200)]
drm/i915: Round the AUX clock divider to closest on all platforms
Currently we round the AUX clock divider down on g4x, to closest
on HSW/BDW port A, and up everywhere else. We are supposed to get
as close to 2MHz as we can, so round to closest seems like the
best option.
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1448893432-6978-6-git-send-email-ville.syrjala@linux.intel.com
Reviewed-by: Jani Nikula <jani.nikula@intel.com>
Ville Syrjälä [Mon, 30 Nov 2015 14:23:45 +0000 (16:23 +0200)]
drm/i915: Kill duplicated PNV .get_display_clock_speed() assignment
Somehow we accumulated a duplicated .get_display_clock_speed()
assignment for PNV in
commit
34edce2fea69 ("drm/i915: Add cdclk extraction for g33, g965gm and g4x")
No real harm on having two, we just never reach the second one, so
simply kill it.
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1448893432-6978-5-git-send-email-ville.syrjala@linux.intel.com
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Reviewed-by: Jani Nikula <jani.nikula@intel.com>
Ville Syrjälä [Mon, 30 Nov 2015 14:23:44 +0000 (16:23 +0200)]
drm/i915: Add HAS_PCH_LPT_H()
We have HAS_PCH_LPT_LP() already, so add HAS_PCH_LPT_H() and use it
where appropriate.
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1448893432-6978-4-git-send-email-ville.syrjala@linux.intel.com
Reviewed-by: Jani Nikula <jani.nikula@intel.com>
Ville Syrjälä [Mon, 30 Nov 2015 14:23:43 +0000 (16:23 +0200)]
drm/i915: Fix vbt PWM max setup for CTG
CTG uses hrawclk for backlight, so calculate the max based on that
instead of cdclk.
Fixes:
aa17cdb4f836 ("drm/i915: initialize backlight max from VBT")
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1448893432-6978-3-git-send-email-ville.syrjala@linux.intel.com
Reviewed-by: Jani Nikula <jani.nikula@intel.com>
Ville Syrjälä [Mon, 30 Nov 2015 14:23:42 +0000 (16:23 +0200)]
drm/i915: Fix VBT backlight Hz to PWM conversion for PNV
Convert the MHz number coming from intel_rawclk() into Hz in
i9xx_hz_to_pwm() on PNV. Otherwise we'll get something totally
bogus as a result.
Fixes:
aa17cdb4f836 ("drm/i915: initialize backlight max from VBT")
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1448893432-6978-2-git-send-email-ville.syrjala@linux.intel.com
Reviewed-by: Jani Nikula <jani.nikula@intel.com>
Imre Deak [Tue, 1 Dec 2015 08:23:52 +0000 (10:23 +0200)]
drm/i915/bxt: backlight clock gating workaround
Per bspec, "Backlight PWM may stop in the asserted state, causing
backlight to stay fully on. WA: Before disabling PWM, set CLKGATE_DIS_0
0x46530 bit 13 PWM1 Gating Dis (for PWM1) or bit 14 PWM2 Gating Dis (for
PWM2). The bits can remain set without harm." (There's no workaround
name for this.)
This fixes some Broxton backlight issues.
Signed-off-by: Imre Deak <imre.deak@intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
[Jani: cleanup & commit message]
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1448958232-26520-3-git-send-email-jani.nikula@intel.com
Jani Nikula [Tue, 1 Dec 2015 08:23:51 +0000 (10:23 +0200)]
drm/i915: use default 200 Hz backlight frequency
If the backlight modulation frequency can't be extracted from the
registers or from VBT, use 200 Hz as the default. This may enable
backlight on some machines that previously failed.
Reviewed-by: Imre Deak <imre.deak@intel.com>
Tested-by: Imre Deak <imre.deak@intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1448958232-26520-2-git-send-email-jani.nikula@intel.com
Jani Nikula [Tue, 1 Dec 2015 08:23:50 +0000 (10:23 +0200)]
drm/i915/bxt: add support for setting backlight freq from vbt
The only missing piece is the function to convert frequency to PWM
register value. The PWM is based on 19.2 MHz clock, except for BXT A
step, which is based on CDCLK, and which we ignore.
Reviewed-by: Imre Deak <imre.deak@intel.com>
Tested-by: Imre Deak <imre.deak@intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1448958232-26520-1-git-send-email-jani.nikula@intel.com
Matt Roper [Tue, 1 Dec 2015 17:26:58 +0000 (09:26 -0800)]
drm/i915/bxt: Disable power well support
BXT power well support is not yet stable. Starting with patch
commit
9f836f9016ad5320e0c9230419d2102cf15a28aa
Author: Patrik Jakobsson <patrik.jakobsson@linux.intel.com>
Date: Mon Nov 16 16:20:01 2015 +0100
drm/i915/gen9: Turn DC handling into a power well
DPMS off operations may actually cause the entire system to powerdown or
reboot. Disable power well support for now until Broxton gets fixes
similar to what we have for SKL.
Cc: Imre Deak <imre.deak@intel.com>
Cc: Patrik Jakobsson <patrik.jakobsson@linux.intel.com>
References: http://lists.freedesktop.org/archives/intel-gfx/2015-November/081037.html
Signed-off-by: Matt Roper <matthew.d.roper@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1448990818-11005-1-git-send-email-matthew.d.roper@intel.com
Reviewed-by: Imre Deak <imre.deak@intel.com>
Ville Syrjälä [Wed, 25 Nov 2015 14:35:30 +0000 (16:35 +0200)]
drm/i915: Use intel_pipe_will_have_type() in ironlake_crtc_compute_clock()
ironlake_crtc_compute_clock() gets called during atomic compute phase,
so we must check the future pipe type instead of the current type.
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1448462131-13321-1-git-send-email-ville.syrjala@linux.intel.com
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Ville Syrjälä [Thu, 26 Nov 2015 16:27:07 +0000 (18:27 +0200)]
drm/i915: Don't use crtc->config when reading out infoframe state
The .get_config() hooks should not reference anything in crtc->config,
everything should be based on the passed in pipe_config instead. So
don't dig out the cpu_transcoder from crtc->config on ddi platfforms,
and also avoid using the encoder->crtc link and instead look up the
pipe via pipe_config->base.crtc.
I don't think this will actually fix anything since during the initial
state readout we set up the encoder->crtc link prior to calling
.get_config(), and during the modeset state check the encoder->crtc
ought to be correct anyway since it's that state we just programmed.
But this seems the right thing to do anyway.
While at it, do some house cleaning on the local variables in the
.infoframe_enabled() hooks.
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1448555227-31403-1-git-send-email-ville.syrjala@linux.intel.com
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Daniel Vetter [Sat, 28 Nov 2015 10:05:39 +0000 (11:05 +0100)]
drm/i915: fix fdi related fifo underruns on hsw
Similar to
commit
37ca8d4ccd9860df0747aa2ea281a3c9c4bf8826
Author: Ville Syrjälä <ville.syrjala@linux.intel.com>
Date: Fri Oct 30 19:20:27 2015 +0200
drm/i915: Enable PCH FIFO underruns later on ILK/SNB/IVB
we can only enable fifo underrun reporting when using the fdi/lpt
after everything is set up and after a bit of waiting. The waiting
is required, enabling it right after enabling encoders will first trigger
an underrun on the pch and then, 1 frame later, an underrun on the
cpu. Two vblank waits after encoder enabling seems enough to curb it.
And similar to
Author: Ville Syrjälä <ville.syrjala@linux.intel.com>
Date: Fri Nov 20 22:09:18 2015 +0200
drm/i915: Suppress spurious CPU FIFO underruns on ILK-IVB
we also need to make sure cpu fifo underrun reporting is disabled when
enabling the fdi rx/tx and pch transcoder&port. But somehow this is
only needed when enabling, not also when disabling.
Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1448705139-12534-1-git-send-email-daniel.vetter@ffwll.ch
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=91578
Tested-by: Mika Kahola <mika.kahola@intel.com>
Reviewed-by: Mika Kahola <mika.kahola@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Jani Nikula [Fri, 27 Nov 2015 10:21:46 +0000 (12:21 +0200)]
drm/i915: add has_dsi_encoder to crtc state
DSI has quite a few special cases, like DP, so add it to crtc
state. This way we can get rid of a number of intel_pipe_has_type()
checks for DSI. This isn't necessarily the prettiest way, but it's a
step towards being aligned with what's being done with other encoders.
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1448619706-21293-3-git-send-email-jani.nikula@intel.com
Jani Nikula [Fri, 27 Nov 2015 10:21:45 +0000 (12:21 +0200)]
drm/i915: remove pre_pll_enable hook from DDI/gen9+ crtc enable
The hook was added to cater for DSI, but with the hooks rearranged on
the DSI encoder side, this is no longer needed. It was a bit silly
anyway to have two hooks called back-to-back.
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1448619706-21293-2-git-send-email-jani.nikula@intel.com
Jani Nikula [Fri, 27 Nov 2015 10:21:44 +0000 (12:21 +0200)]
drm/i915/dsi: merge pre_pll_enable hook to pre_enable
For DSI, the pre_pll_enable and the pre_enable hooks are called
back-to-back on all platforms that support DSI. The distinction is
artificial for DSI, for which we enable the DSI PLL in the encoder
hooks. Do everything in pre_enable, and remove DSI pre_pll_enable hook.
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1448619706-21293-1-git-send-email-jani.nikula@intel.com
Namrta Salonie [Fri, 27 Nov 2015 08:13:11 +0000 (13:43 +0530)]
drm/i915: Fix possible null dereference in framebuffer_info debugfs function
Found by static code analysis tool.
v2: Inserted block instead of goto & renamed variables (Chris)
v3: Aligned code as per the opening brace (Chris)
Rebased on top of nightly (Daniel)
Signed-off-by: Namrta Salonie <namrta.salonie@intel.com>
Signed-off-by: Deepak S <deepak.s@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Ville Syrjälä [Wed, 25 Nov 2015 14:21:30 +0000 (16:21 +0200)]
drm/i915: Fix kerneldoc indent fails
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1448461290-12333-1-git-send-email-ville.syrjala@linux.intel.com
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Ville Syrjälä [Mon, 23 Nov 2015 16:06:17 +0000 (18:06 +0200)]
drm/i915: Introduce bdw_{update,enable,disable}_pipe_irq()
Pull the BDW+ DE pipe interrupt mask frobbing into a central place,
like we have for other platforms.
v2: Fix the kerneldoc (Daniel)
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1448294777-13722-4-git-send-email-ville.syrjala@linux.intel.com
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Ville Syrjälä [Mon, 23 Nov 2015 16:06:16 +0000 (18:06 +0200)]
drm/i915: Make ironlake_{enable,disable}_display_irq() static inlines
ironlake_{enable,disable}_display_irq() each just call
ilk_update_display_irq() so let's make them static inlines.
While at it s/ironlake/ilk/ to make things shorter, and a bit more
consistent with the ibx functions.
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1448294777-13722-3-git-send-email-ville.syrjala@linux.intel.com
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Ville Syrjälä [Mon, 23 Nov 2015 16:06:15 +0000 (18:06 +0200)]
drm/i915: Make ibx_{enable,disable}_display_interrupt() static inlines
No reason why ibx_{enable,disable}_display_interrupt() couldn't be
static inlines instead of cpp macros.
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1448294777-13722-2-git-send-email-ville.syrjala@linux.intel.com
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Jani Nikula [Wed, 25 Nov 2015 14:47:23 +0000 (16:47 +0200)]
Revert "drm/i915: shut up gen8+ SDE irq dmesg noise"
This reverts
commit
97e5ed1111dcc5300a0f59a55248cd243937a8ab
Author: Daniel Vetter <daniel.vetter@ffwll.ch>
Date: Fri Oct 23 10:56:12 2015 +0200
drm/i915: shut up gen8+ SDE irq dmesg noise
With the proper fix ("drm/i915: fix the SDE irq dmesg warnings
properly") reliably in place, bring back the error message.
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1448462843-32739-2-git-send-email-jani.nikula@intel.com
Jani Nikula [Wed, 25 Nov 2015 14:47:22 +0000 (16:47 +0200)]
drm/i915: fix the SDE irq dmesg warnings properly
We had the "The master control interrupt lied (SDE)!" check and error
message in place for a long time without any problems, until
commit
aaf5ec2e51ab1d9c5e962b4728a1107ed3ff7a3e
Author: Sonika Jindal <sonika.jindal@intel.com>
Date: Wed Jul 8 17:07:47 2015 +0530
drm/i915: Handle HPD when it has actually occurred
caused the errors to start happening. This was bisected and reported,
but the error message was silenced in
commit
97e5ed1111dcc5300a0f59a55248cd243937a8ab
Author: Daniel Vetter <daniel.vetter@ffwll.ch>
Date: Fri Oct 23 10:56:12 2015 +0200
drm/i915: shut up gen8+ SDE irq dmesg noise
shooting the messenger while the debugging for why Sonika's commit
triggered the errors was still in progress.
It looks like we need to read and acknowledge the PCH_PORT_HOTPLUG
register even though the hotplug trigger indicates there isn't a hotplug
irq to handle. The PCH doesn't seem to really ack the the interrupt to
the CPU unless we touch the hotplug register.
Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Cc: Sonika Jindal <sonika.jindal@intel.com>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=92084
Fixes:
aaf5ec2e51ab ("drm/i915: Handle HPD when it has actually occurred")
[Jani: added a comment and amended the commit message while applying]
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1448462843-32739-1-git-send-email-jani.nikula@intel.com
Gerd Hoffmann [Thu, 26 Nov 2015 11:03:51 +0000 (12:03 +0100)]
drm/i915: more virtual south bridge detection
Commit "
30c964a drm/i915: Detect virtual south bridge" detects and
handles the southbridge emulated by vmware esx. Add the ich9 south
bridge emulated by 'qemu -M q35'.
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Jani Nikula [Tue, 24 Nov 2015 16:47:25 +0000 (18:47 +0200)]
drm/i915: remove duplicate definition of for_each_power_domain
commit
b04c5bd6fda54703e56f29569e4bca489d6c5a5c
Author: Borun Fu <borun.fu@intel.com>
Date: Sat Jul 12 10:02:27 2014 +0530
drm/i915: Power gating display wells during i915_pm_suspend
moved for_each_power_domain from intel_display.c to i915_drv.h but we
still have the definition around in intel_display.c, due to a merge
conflict resolution gone wrong in
commit
4dac3edfe68e5e1b3c2216b84ba160572420fa40
Merge:
487777673e35 e05444be705b
Author: Daniel Vetter <daniel.vetter@ffwll.ch>
Date: Tue Jul 29 20:49:36 2014 +0200
Merge remote-tracking branch 'airlied/drm-next' into drm-intel-next
Just remove the extra definition left behind.
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1448383645-7615-1-git-send-email-jani.nikula@intel.com
Ville Syrjälä [Fri, 20 Nov 2015 20:35:41 +0000 (22:35 +0200)]
drm/i915: Don't register CRT connector when it's fused off
On some machines the CRT connector may be fused off. The weird thing
about this setup is that the ADPA register works otherwise normally,
except the enable bit is hardwired to 0. No one knows of any fuse
register that would tell us if this is the case, so the only thing we
can do (apart from a blacklist) is to try and set the enable bit and see
if it sticks. If not, we don't register the connector at all. Obviously
if the bit is already set when loading the driver we can just assume it
works.
I've smoke tested this approach on several machines (GMCH and PCH),
some with actual CRT connectors, some with shadow connectors, and
obviously the machine (IVB) with the fused off connector. So far
I've not seen any ill effects from this probe.
The main benefit is that we can actually run igt on machines with
fused off connectors, without totally upsetting the state checker.
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1448051741-22771-1-git-send-email-ville.syrjala@linux.intel.com
Acked-by: Chris Wilson <chris@chris-wilson.co.uk>
Ville Syrjälä [Fri, 20 Nov 2015 20:09:20 +0000 (22:09 +0200)]
drm/i915: Check for underruns after crtc disable
To get a better idea if underruns occurred during crtc disabling,
let's check for them explicitly. This helps in cases where the
error interrupt isn't active, or there is no underrun interrupt
support at all.
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1448050160-14124-3-git-send-email-ville.syrjala@linux.intel.com
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Ville Syrjälä [Fri, 20 Nov 2015 20:09:19 +0000 (22:09 +0200)]
drm/i915: Disable CPU underruns around eDP port and vdd enable on ILK-IVB
We sometimes get a spurious CPU pipe underrun somewhere between
enabling port A and enabling vdd for the panel. Observed on both
ILK and IVB with port A eDP. Suppress FIFO underrun reporting
around the port and vdd enable to avoid the dmesg errors.
Not sure if port D eDP would suffer from the same issue, but assume
that it doesn't until proven differently.
Testcase: igt/kms_setmode
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1448050160-14124-2-git-send-email-ville.syrjala@linux.intel.com
Acked-by: Chris Wilson <chris@chris-wilson.co.uk>
Ville Syrjälä [Fri, 20 Nov 2015 20:09:18 +0000 (22:09 +0200)]
drm/i915: Suppress spurious CPU FIFO underruns on ILK-IVB
We still get spurious pipe underruns on ILK/SNB/IVB under two
circumstances when dealing with PCH ports:
* When the pipe has been disabled, but FDI RX/TX is still enabled
* During FDI link training
Both cases seem to happen at least when we do VGA+HDMI cloning
from the same pipe. I don't think I've seen them when not cloning,
but can't be 100% sure.
Disable underrun reporting around those places to eliminate the
dmesg errors.
Testcase: igt/kms_setmode/basic-clone-single-crtc
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1448050160-14124-1-git-send-email-ville.syrjala@linux.intel.com
Acked-by: Chris Wilson <chris@chris-wilson.co.uk>
Rodrigo Vivi [Mon, 23 Nov 2015 22:19:32 +0000 (14:19 -0800)]
drm/i915: Also disable PSR on Sink when disabling it on Source.
It is not a bad idea to disable the PSR feature on Sink
when we are disabling on the Source.
v2: Move dpcd write inside mutex protected area as suggested by Sonika.
Cc: Sonika Jindal <sonika.jindal@intel.com>
Suggested-by: Sonika Jindal <sonika.jindal@intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Reviewed-by: Sonika Jindal <sonika.jindal@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Rodrigo Vivi [Mon, 23 Nov 2015 22:16:40 +0000 (14:16 -0800)]
drm/i915: Remove PSR Perf Counter for SKL+
Whenever DMC firmware put the HW into DC State a bunch
of registers including this perf counter is reset to 0.
Even with PSR active and working we could still read
"Performance_Counter: 0" what will misslead people to believe
PSR is broken. For instance on SKL we can only see PC10
residency with screen on if PSR is working properly.
However Performance_Counter was showing 0.
Even if it restored properly on DC6 exit we don't want to
give users the wrong impression that PSR is not working
while we know for sure it is.
So, it is better to remove this counter information while
we don't have a better way to track PSR residency.
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Reviewed-by: Durgadoss R <durgadoss.r@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Rodrigo Vivi [Wed, 18 Nov 2015 19:21:55 +0000 (11:21 -0800)]
drm/i915: PSR: Mask LPSP hw tracking back again.
When we introduced PSR we let LPSP masked allowing us to get PSR
independently from the audio runtime PM. However in one of the
attempts to get PSR enabled by default one user reported one specific
case where he would miss screen updates if scrolling the firefox in a
Gnome environment when i915 runtime pm was enabled. So for
this specific case that (I could never create an i-g-t test case)
we decided to remove the LPSP mask and let HW tracking taking care of
this case. The mask got removed later by my
commit
09108b90f04 ("drm/i915: PSR: Remove Low Power HW tracking mask.")
So we started depending on audio driver again, what is bad.
With previous commit
"drm/i915: PSR: Let's rely more on frontbuffer tracking."
we transfered the PSR exit responsability totally to SW frontbuffer
tracking. So now can safelly shut off a bit the HW tracking, or
at least this case that makes us to depend on other drivers.
v2: Update commit message since this patch by itself doesn't solve
the bugzilla entries.
v3: Another attempt to improve commit message.
Cc: Paulo Zanoni <paulo.r.zanoni@intel.com>
Tested-by: Brian Norris <briannorris@chromium.org>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Reviewed-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
Reviewed-by: Damien Lespiau damien.lespiau@intel.com
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Rodrigo Vivi [Wed, 18 Nov 2015 19:21:12 +0000 (11:21 -0800)]
drm/i915: PSR: Let's rely more on frontbuffer tracking.
The ultimate goal here is to remove the dependency we
currently have on audio driver power to get PSR working.
Since with audio driver runtime PM disabled the Hardware tracking
believes graphics is fully active and prevent PSR Entry, or
in other words continuously exit PSR.
So, the idea is to transfer the PSR exit responsability
from the HW tracking to the SW tracking (frontbuffer tracking),
who is really mature right now.
However with LPSP masked out there might be cases where we could
miss exit from HW tracking since it can be relying on this,
like a specific case reported at our mailing list who
user reported he would miss screen updates if scrolling firefox
in a Gnome environment when i915 runtimepm was enabled.
So before masking out LPSP again to make us independent from
the audio driver we need to make sure that all our cases
are coverred from the frontbuffer tracking perspective,
where the flush means invalidate and flush.
Without this patch for HSW, BDW and SKL we just do the
invalidate part when the flush wasn't originated by a page flip
because we were trusting the HW tracking for the flip case.
So let's rely more on frontbuffer tracking and do the
invalidation regardless the origin as expected for all platforms.
v2: Improve commit message as suggested by Paulo.
v3: Another attempt to let commit message more clear.
Cc: Paulo Zanoni <paulo.r.zanoni@intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Reviewed-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
Reviewed-by: Damien Lespiau damien.lespiau@intel.com
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Rodrigo Vivi [Thu, 12 Nov 2015 22:46:05 +0000 (14:46 -0800)]
drm/i915: Remove duplicated dpcd write on hsw_psr_enable_sink.
Commit (
89251b17) intended to remove this line and let only one
DP_PSR_EN_CFG set, but it was wrong and this call is now duplicated
at the code.
Also "& ~DP_PSR_MAIN_LINK_ACTIVE" doesn't do anything at all. It
was like that since I introduced this call but probably the idea
was to be informative and make clear statement that we were not using
the link standby. So it is better to remove this one here and let
the code a bit cleaner.
v2: Improve commit message as requested by Paulo.
Cc: Paulo Zanoni <paulo.r.zanoni@intel.com>
Tested-by: Brian Norris <briannorris@chromium.org>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Reviewed-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
Reviewed-by: Damien Lespiau damien.lespiau@intel.com
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Tvrtko Ursulin [Fri, 20 Nov 2015 13:23:36 +0000 (13:23 +0000)]
drm/i915: Remove incorrect warning in context cleanup
Commit
e9f24d5fb7cf3628b195b18ff3ac4e37937ceeae
Author: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Date: Mon Oct 5 13:26:36 2015 +0100
drm/i915: Clean up associated VMAs on context destruction
Added a warning based on an incorrect assumption that all VMAs
in a VM will be on the inactive list at the point last reference
to a context and VM is dropped.
This is not true because i915_gem_object_retire__read will not
put VMA on the inactive list until all activities on the object
in question (in all VMs) have been retired.
As a consequence, whether or not a context/VM will be destroyed
with its VMAs still on the active list, can depend on completely
unrelated activities using the same object from a different
context or engine.
Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=92638
Testcase: igt/gem_request_retire/retire-vma-not-inactive
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Michel Thierry <michel.thierry@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1448025816-25584-1-git-send-email-tvrtko.ursulin@linux.intel.com
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Daniel Stone [Fri, 20 Nov 2015 15:55:34 +0000 (15:55 +0000)]
drm/i915/pm: Print offending domain in refcount failure
If we experience a refcounting failure in a power domain/well (unref'ing at
least one too many times), log the name of the offending domain or well.
Signed-off-by: Daniel Stone <daniels@collabora.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Acked-by: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Imre Deak <imre.deak@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1448034934-11926-2-git-send-email-daniels@collabora.com
Daniel Stone [Fri, 20 Nov 2015 15:55:33 +0000 (15:55 +0000)]
drm/i915/pm: Unstatic power_domain_str
Let us print human-parseable values from the power domain code; upcoming
display code also wants to use it.
This requires moving it out of i915_debugfs.c, as that is only conditionally
compiled.
v2: Move it out of the header.
Signed-off-by: Daniel Stone <daniels@collabora.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Imre Deak <imre.deak@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1448034934-11926-1-git-send-email-daniels@collabora.com
Imre Deak [Wed, 18 Nov 2015 17:53:50 +0000 (19:53 +0200)]
drm/i915/skl: re-enable power well support
Now that the known DMC/DC issues are fixed, let's try again and
re-enable the power well support.
Signed-off-by: Imre Deak <imre.deak@intel.com>
Reviewed-by: Patrik Jakobsson <patrik.jakobsson@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1447869230-21416-1-git-send-email-imre.deak@intel.com
Imre Deak [Wed, 18 Nov 2015 15:32:30 +0000 (17:32 +0200)]
drm/i915/skl: enable PC9/10 power states during suspend-to-idle
During suspend-to-idle we need to keep the DMC firmware active and DC6
enabled, since otherwise we won't reach deep system power states like
PC9/10. The lead for this came from Nivedita who noticed that the
kernel's turbostat tool didn't report any PC9/10 residency change
across an 'echo freeze > /sys/power/state'.
Reported-by: Nivedita Swaminathan <nivedita.swaminathan@intel.com>
Signed-off-by: Imre Deak <imre.deak@intel.com>
Reviewed-by: Patrik Jakobsson <patrik.jakobsson@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1447860750-18110-1-git-send-email-imre.deak@intel.com
Daniel Vetter [Mon, 23 Nov 2015 08:04:05 +0000 (09:04 +0100)]
Merge tag 'v4.4-rc2' into drm-intel-next-queued
Linux 4.4-rc2
Backmerge to get at
commit
1b0e3a049efe471c399674fd954500ce97438d30
Author: Imre Deak <imre.deak@intel.com>
Date: Thu Nov 5 23:04:11 2015 +0200
drm/i915/skl: disable display side power well support for now
so that we can proplery re-eanble skl power wells in -next.
Conflicts are just adjacent lines changed, except for intel_fbdev.c
where we need to interleave the changs. Nothing nefarious.
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
Daniel Vetter [Fri, 20 Nov 2015 16:02:08 +0000 (17:02 +0100)]
drm/i915: Update DRIVER_DATE to
20151120
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Linus Torvalds [Mon, 23 Nov 2015 00:45:59 +0000 (16:45 -0800)]
Linux 4.4-rc2
Linus Torvalds [Sun, 22 Nov 2015 23:21:40 +0000 (15:21 -0800)]
Merge branch 'akpm' (patches from Andrew)
Merge slub bulk allocator updates from Andrew Morton:
"This missed the merge window because I was waiting for some repairs to
come in. Nothing actually uses the bulk allocator yet and the changes
to other code paths are pretty small. And the net guys are waiting
for this so they can start merging the client code"
More comments from Jesper Dangaard Brouer:
"The kmem_cache_alloc_bulk() call, in mm/slub.c, were included in
previous kernel. The present version contains a bug. Vladimir
Davydov noticed it contained a bug, when kernel is compiled with
CONFIG_MEMCG_KMEM (see commit
03ec0ed57ffc: "slub: fix kmem cgroup
bug in kmem_cache_alloc_bulk"). Plus the mem cgroup counterpart in
kmem_cache_free_bulk() were missing (see commit
033745189b1b "slub:
add missing kmem cgroup support to kmem_cache_free_bulk").
I don't consider the fix stable-material because there are no in-tree
users of the API.
But with known bugs (for memcg) I cannot start using the API in the
net-tree"
* emailed patches from Andrew Morton <akpm@linux-foundation.org>:
slab/slub: adjust kmem_cache_alloc_bulk API
slub: add missing kmem cgroup support to kmem_cache_free_bulk
slub: fix kmem cgroup bug in kmem_cache_alloc_bulk
slub: optimize bulk slowpath free by detached freelist
slub: support for bulk free with SLUB freelists
Linus Torvalds [Sun, 22 Nov 2015 23:10:57 +0000 (15:10 -0800)]
Merge tag 'tty-4.4-rc2' of git://git./linux/kernel/git/gregkh/tty
Pull tty/serial fixes from Greg KH:
"Here are a few small tty/serial driver fixes for 4.4-rc2 that resolve
some reported problems.
All have been in linux-next, full details are in the shortlog below"
* tag 'tty-4.4-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty:
serial: export fsl8250_handle_irq
serial: 8250_mid: Add missing dependency
tty: audit: Fix audit source
serial: etraxfs-uart: Fix crash
serial: fsl_lpuart: Fix earlycon support
bcm63xx_uart: Use the device name when registering an interrupt
tty: Fix direct use of tty buffer work
tty: Fix tty_send_xchar() lock order inversion
Linus Torvalds [Sun, 22 Nov 2015 21:26:24 +0000 (13:26 -0800)]
Merge tag 'staging-4.4-rc2' of git://git./linux/kernel/git/gregkh/staging
Pull staging/IIO fixes from Greg KH:
"Here are some staging and iio driver fixes for 4.4-rc2. All of these
are in response to issues that have been reported and have been in
linux-next for a while"
* tag 'staging-4.4-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging:
Revert "Staging: wilc1000: coreconfigurator: Drop unneeded wrapper functions"
iio: adc: xilinx: Fix VREFN scale
iio: si7020: Swap data byte order
iio: adc: vf610_adc: Fix division by zero error
iio:ad7793: Fix ad7785 product ID
iio: ad5064: Fix ad5629/ad5669 shift
iio:ad5064: Make sure ad5064_i2c_write() returns 0 on success
iio: lpc32xx_adc: fix warnings caused by enabling unprepared clock
staging: iio: select IRQ_WORK for IIO_DUMMY_EVGEN
vf610_adc: Fix internal temperature calculation
Linus Torvalds [Sun, 22 Nov 2015 21:15:05 +0000 (13:15 -0800)]
Merge tag 'usb-4.4-rc2' of git://git./linux/kernel/git/gregkh/usb
Pull USB fixes from Greg KH:
"Here are a number of USB fixes and new device ids for 4.4-rc2. All
have been in linux-next and the details are in the shortlog"
* tag 'usb-4.4-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb: (28 commits)
usblp: do not set TASK_INTERRUPTIBLE before lock
USB: MAINTAINERS: cxacru
usb: kconfig: fix warning of select USB_OTG
USB: option: add XS Stick W100-2 from 4G Systems
xhci: Fix a race in usb2 LPM resume, blocking U3 for usb2 devices
usb: xhci: fix checking ep busy for CFC
xhci: Workaround to get Intel xHCI reset working more reliably
usb: chipidea: imx: fix a possible NULL dereference
usb: chipidea: usbmisc_imx: fix a possible NULL dereference
usb: chipidea: otg: gadget module load and unload support
usb: chipidea: debug: disable usb irq while role switch
ARM: dts: imx27.dtsi: change the clock information for usb
usb: chipidea: imx: refine clock operations to adapt for all platforms
usb: gadget: atmel_usba_udc: Expose correct device speed
usb: musb: enable usb_dma parameter
usb: phy: phy-mxs-usb: fix a possible NULL dereference
usb: dwc3: gadget: let us set lower max_speed
usb: musb: fix tx fifo flush handling
usb: gadget: f_loopback: fix the warning during the enumeration
usb: dwc2: host: Fix remote wakeup when not in DWC2_L2
...
Linus Torvalds [Sun, 22 Nov 2015 20:59:46 +0000 (12:59 -0800)]
Merge branch 'upstream' of git://git.linux-mips.org/ralf/upstream-linus
Pull MIPS fixes from Ralf Baechle:
- Fix a flood of annoying build warnings
- A number of fixes for Atheros 79xx platforms
* 'upstream' of git://git.linux-mips.org/pub/scm/ralf/upstream-linus:
MIPS: ath79: Add a machine entry for booting OF machines
MIPS: ath79: Fix the size of the MISC INTC registers in ar9132.dtsi
MIPS: ath79: Fix the DDR control initialization on ar71xx and ar934x
MIPS: Fix flood of warnings about comparsion being always true.
Linus Torvalds [Sun, 22 Nov 2015 20:50:58 +0000 (12:50 -0800)]
Merge branch 'parisc-4.4-2' of git://git./linux/kernel/git/deller/parisc-linux
Pull parisc update from Helge Deller:
"This patchset adds Huge Page and HUGETLBFS support for parisc"
Honestly, the hugepage support should have gone through in the merge
window, and is not really an rc-time fix. But it only touches
arch/parisc, and I cannot find it in myself to care. If one of the
three parisc users notices a breakage, I will point at Helge and make
rude farting noises.
* 'parisc-4.4-2' of git://git.kernel.org/pub/scm/linux/kernel/git/deller/parisc-linux:
parisc: Map kernel text and data on huge pages
parisc: Add Huge Page and HUGETLBFS support
parisc: Use long branch to do_syscall_trace_exit
parisc: Increase initial kernel mapping to 32MB on 64bit kernel
parisc: Initialize the fault vector earlier in the boot process.
parisc: Add defines for Huge page support
parisc: Drop unused MADV_xxxK_PAGES flags from asm/mman.h
parisc: Drop definition of start_thread_som for HP-UX SOM binaries
parisc: Fix wrong comment regarding first pmd entry flags
Linus Torvalds [Sun, 22 Nov 2015 20:37:20 +0000 (12:37 -0800)]
Merge branch 'perf-urgent-for-linus' of git://git./linux/kernel/git/tip/tip
Pull perf tool fixes from Thomas Gleixner:
"A couple of fixes for perf tools:
- Build system updates
- Plug a memory leak in an error path of perf probe
- Tear down probes correctly when adding fails
- Fixes to the perf symbol handling
- Fix ordering of event processing in buildid-list
- Fix per DSO filtering in the histogram browser"
* 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
perf probe: Clear probe_trace_event when add_probe_trace_event() fails
perf probe: Fix memory leaking on failure by clearing all probe_trace_events
perf inject: Also re-pipe lost_samples event
perf buildid-list: Requires ordered events
perf symbols: Fix dso lookup by long name and missing buildids
perf symbols: Allow forcing reading of non-root owned files by root
perf hists browser: The dso can be obtained from popup_action->ms.map->dso
perf hists browser: Fix 'd' hotkey action to filter by DSO
perf symbols: Rebuild rbtree when adjusting symbols for kcore
tools: Add a "make all" rule
tools: Actually install tmon in the install rule
Linus Torvalds [Sun, 22 Nov 2015 20:00:12 +0000 (12:00 -0800)]
Merge branch 'x86-urgent-for-linus' of git://git./linux/kernel/git/tip/tip
Pull x86 fixes from Thomas Gleixner:
"This update contains:
- MPX updates for handling 32bit processes
- A fix for a long standing bug in 32bit signal frame handling
related to FPU/XSAVE state
- Handle get_xsave_addr() correctly in KVM
- Fix SMAP check under paravirtualization
- Add a comment to the static function trace entry to avoid further
confusion about the difference to dynamic tracing"
* 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
x86/cpu: Fix SMAP check in PVOPS environments
x86/ftrace: Add comment on static function tracing
x86/fpu: Fix get_xsave_addr() behavior under virtualization
x86/fpu: Fix 32-bit signal frame handling
x86/mpx: Fix 32-bit address space calculation
x86/mpx: Do proper get_user() when running 32-bit binaries on 64-bit kernels
Jesper Dangaard Brouer [Fri, 20 Nov 2015 23:57:58 +0000 (15:57 -0800)]
slab/slub: adjust kmem_cache_alloc_bulk API
Adjust kmem_cache_alloc_bulk API before we have any real users.
Adjust API to return type 'int' instead of previously type 'bool'. This
is done to allow future extension of the bulk alloc API.
A future extension could be to allow SLUB to stop at a page boundary, when
specified by a flag, and then return the number of objects.
The advantage of this approach, would make it easier to make bulk alloc
run without local IRQs disabled. With an approach of cmpxchg "stealing"
the entire c->freelist or page->freelist. To avoid overshooting we would
stop processing at a slab-page boundary. Else we always end up returning
some objects at the cost of another cmpxchg.
To keep compatible with future users of this API linking against an older
kernel when using the new flag, we need to return the number of allocated
objects with this API change.
Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com>
Cc: Vladimir Davydov <vdavydov@virtuozzo.com>
Acked-by: Christoph Lameter <cl@linux.com>
Cc: Pekka Enberg <penberg@kernel.org>
Cc: David Rientjes <rientjes@google.com>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Jesper Dangaard Brouer [Fri, 20 Nov 2015 23:57:55 +0000 (15:57 -0800)]
slub: add missing kmem cgroup support to kmem_cache_free_bulk
Initial implementation missed support for kmem cgroup support in
kmem_cache_free_bulk() call, add this.
If CONFIG_MEMCG_KMEM is not enabled, the compiler should be smart enough
to not add any asm code.
Incoming bulk free objects can belong to different kmem cgroups, and
object free call can happen at a later point outside memcg context. Thus,
we need to keep the orig kmem_cache, to correctly verify if a memcg object
match against its "root_cache" (s->memcg_params.root_cache).
Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com>
Reviewed-by: Vladimir Davydov <vdavydov@virtuozzo.com>
Cc: Christoph Lameter <cl@linux.com>
Cc: Pekka Enberg <penberg@kernel.org>
Cc: David Rientjes <rientjes@google.com>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Jesper Dangaard Brouer [Fri, 20 Nov 2015 23:57:52 +0000 (15:57 -0800)]
slub: fix kmem cgroup bug in kmem_cache_alloc_bulk
The call slab_pre_alloc_hook() interacts with kmemgc and is not allowed to
be called several times inside the bulk alloc for loop, due to the call to
memcg_kmem_get_cache().
This would result in hitting the VM_BUG_ON in __memcg_kmem_get_cache.
As suggested by Vladimir Davydov, change slab_post_alloc_hook() to be able
to handle an array of objects.
A subtle detail is, loop iterator "i" in slab_post_alloc_hook() must have
same type (size_t) as size argument. This helps the compiler to easier
realize that it can remove the loop, when all debug statements inside loop
evaluates to nothing. Note, this is only an issue because the kernel is
compiled with GCC option: -fno-strict-overflow
In slab_alloc_node() the compiler inlines and optimizes the invocation of
slab_post_alloc_hook(s, flags, 1, &object) by removing the loop and access
object directly.
Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com>
Reported-by: Vladimir Davydov <vdavydov@virtuozzo.com>
Suggested-by: Vladimir Davydov <vdavydov@virtuozzo.com>
Reviewed-by: Vladimir Davydov <vdavydov@virtuozzo.com>
Cc: Christoph Lameter <cl@linux.com>
Cc: Pekka Enberg <penberg@kernel.org>
Cc: David Rientjes <rientjes@google.com>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Jesper Dangaard Brouer [Fri, 20 Nov 2015 23:57:49 +0000 (15:57 -0800)]
slub: optimize bulk slowpath free by detached freelist
This change focus on improving the speed of object freeing in the
"slowpath" of kmem_cache_free_bulk.
The calls slab_free (fastpath) and __slab_free (slowpath) have been
extended with support for bulk free, which amortize the overhead of
the (locked) cmpxchg_double.
To use the new bulking feature, we build what I call a detached
freelist. The detached freelist takes advantage of three properties:
1) the free function call owns the object that is about to be freed,
thus writing into this memory is synchronization-free.
2) many freelist's can co-exist side-by-side in the same slab-page
each with a separate head pointer.
3) it is the visibility of the head pointer that needs synchronization.
Given these properties, the brilliant part is that the detached
freelist can be constructed without any need for synchronization. The
freelist is constructed directly in the page objects, without any
synchronization needed. The detached freelist is allocated on the
stack of the function call kmem_cache_free_bulk. Thus, the freelist
head pointer is not visible to other CPUs.
All objects in a SLUB freelist must belong to the same slab-page.
Thus, constructing the detached freelist is about matching objects
that belong to the same slab-page. The bulk free array is scanned is
a progressive manor with a limited look-ahead facility.
Kmem debug support is handled in call of slab_free().
Notice kmem_cache_free_bulk no longer need to disable IRQs. This
only slowed down single free bulk with approx 3 cycles.
Performance data:
Benchmarked[1] obj size 256 bytes on CPU i7-4790K @ 4.00GHz
SLUB fastpath single object quick reuse: 47 cycles(tsc) 11.931 ns
To get stable and comparable numbers, the kernel have been booted with
"slab_merge" (this also improve performance for larger bulk sizes).
Performance data, compared against fallback bulking:
bulk - fallback bulk - improvement with this patch
1 - 62 cycles(tsc) 15.662 ns - 49 cycles(tsc) 12.407 ns- improved 21.0%
2 - 55 cycles(tsc) 13.935 ns - 30 cycles(tsc) 7.506 ns - improved 45.5%
3 - 53 cycles(tsc) 13.341 ns - 23 cycles(tsc) 5.865 ns - improved 56.6%
4 - 52 cycles(tsc) 13.081 ns - 20 cycles(tsc) 5.048 ns - improved 61.5%
8 - 50 cycles(tsc) 12.627 ns - 18 cycles(tsc) 4.659 ns - improved 64.0%
16 - 49 cycles(tsc) 12.412 ns - 17 cycles(tsc) 4.495 ns - improved 65.3%
30 - 49 cycles(tsc) 12.484 ns - 18 cycles(tsc) 4.533 ns - improved 63.3%
32 - 50 cycles(tsc) 12.627 ns - 18 cycles(tsc) 4.707 ns - improved 64.0%
34 - 96 cycles(tsc) 24.243 ns - 23 cycles(tsc) 5.976 ns - improved 76.0%
48 - 83 cycles(tsc) 20.818 ns - 21 cycles(tsc) 5.329 ns - improved 74.7%
64 - 74 cycles(tsc) 18.700 ns - 20 cycles(tsc) 5.127 ns - improved 73.0%
128 - 90 cycles(tsc) 22.734 ns - 27 cycles(tsc) 6.833 ns - improved 70.0%
158 - 99 cycles(tsc) 24.776 ns - 30 cycles(tsc) 7.583 ns - improved 69.7%
250 - 104 cycles(tsc) 26.089 ns - 37 cycles(tsc) 9.280 ns - improved 64.4%
Performance data, compared current in-kernel bulking:
bulk - curr in-kernel - improvement with this patch
1 - 46 cycles(tsc) - 49 cycles(tsc) - improved (cycles:-3) -6.5%
2 - 27 cycles(tsc) - 30 cycles(tsc) - improved (cycles:-3) -11.1%
3 - 21 cycles(tsc) - 23 cycles(tsc) - improved (cycles:-2) -9.5%
4 - 18 cycles(tsc) - 20 cycles(tsc) - improved (cycles:-2) -11.1%
8 - 17 cycles(tsc) - 18 cycles(tsc) - improved (cycles:-1) -5.9%
16 - 18 cycles(tsc) - 17 cycles(tsc) - improved (cycles: 1) 5.6%
30 - 18 cycles(tsc) - 18 cycles(tsc) - improved (cycles: 0) 0.0%
32 - 18 cycles(tsc) - 18 cycles(tsc) - improved (cycles: 0) 0.0%
34 - 78 cycles(tsc) - 23 cycles(tsc) - improved (cycles:55) 70.5%
48 - 60 cycles(tsc) - 21 cycles(tsc) - improved (cycles:39) 65.0%
64 - 49 cycles(tsc) - 20 cycles(tsc) - improved (cycles:29) 59.2%
128 - 69 cycles(tsc) - 27 cycles(tsc) - improved (cycles:42) 60.9%
158 - 79 cycles(tsc) - 30 cycles(tsc) - improved (cycles:49) 62.0%
250 - 86 cycles(tsc) - 37 cycles(tsc) - improved (cycles:49) 57.0%
Performance with normal SLUB merging is significantly slower for
larger bulking. This is believed to (primarily) be an effect of not
having to share the per-CPU data-structures, as tuning per-CPU size
can achieve similar performance.
bulk - slab_nomerge - normal SLUB merge
1 - 49 cycles(tsc) - 49 cycles(tsc) - merge slower with cycles:0
2 - 30 cycles(tsc) - 30 cycles(tsc) - merge slower with cycles:0
3 - 23 cycles(tsc) - 23 cycles(tsc) - merge slower with cycles:0
4 - 20 cycles(tsc) - 20 cycles(tsc) - merge slower with cycles:0
8 - 18 cycles(tsc) - 18 cycles(tsc) - merge slower with cycles:0
16 - 17 cycles(tsc) - 17 cycles(tsc) - merge slower with cycles:0
30 - 18 cycles(tsc) - 23 cycles(tsc) - merge slower with cycles:5
32 - 18 cycles(tsc) - 22 cycles(tsc) - merge slower with cycles:4
34 - 23 cycles(tsc) - 22 cycles(tsc) - merge slower with cycles:-1
48 - 21 cycles(tsc) - 22 cycles(tsc) - merge slower with cycles:1
64 - 20 cycles(tsc) - 48 cycles(tsc) - merge slower with cycles:28
128 - 27 cycles(tsc) - 57 cycles(tsc) - merge slower with cycles:30
158 - 30 cycles(tsc) - 59 cycles(tsc) - merge slower with cycles:29
250 - 37 cycles(tsc) - 56 cycles(tsc) - merge slower with cycles:19
Joint work with Alexander Duyck.
[1] https://github.com/netoptimizer/prototype-kernel/blob/master/kernel/mm/slab_bulk_test01.c
[akpm@linux-foundation.org: BUG_ON -> WARN_ON;return]
Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com>
Signed-off-by: Alexander Duyck <alexander.h.duyck@redhat.com>
Acked-by: Christoph Lameter <cl@linux.com>
Cc: Pekka Enberg <penberg@kernel.org>
Cc: David Rientjes <rientjes@google.com>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Jesper Dangaard Brouer [Fri, 20 Nov 2015 23:57:46 +0000 (15:57 -0800)]
slub: support for bulk free with SLUB freelists
Make it possible to free a freelist with several objects by adjusting API
of slab_free() and __slab_free() to have head, tail and an objects counter
(cnt).
Tail being NULL indicate single object free of head object. This allow
compiler inline constant propagation in slab_free() and
slab_free_freelist_hook() to avoid adding any overhead in case of single
object free.
This allows a freelist with several objects (all within the same
slab-page) to be free'ed using a single locked cmpxchg_double in
__slab_free() and with an unlocked cmpxchg_double in slab_free().
Object debugging on the free path is also extended to handle these
freelists. When CONFIG_SLUB_DEBUG is enabled it will also detect if
objects don't belong to the same slab-page.
These changes are needed for the next patch to bulk free the detached
freelists it introduces and constructs.
Micro benchmarking showed no performance reduction due to this change,
when debugging is turned off (compiled with CONFIG_SLUB_DEBUG).
Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com>
Signed-off-by: Alexander Duyck <alexander.h.duyck@redhat.com>
Acked-by: Christoph Lameter <cl@linux.com>
Cc: Pekka Enberg <penberg@kernel.org>
Cc: David Rientjes <rientjes@google.com>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Helge Deller [Sat, 21 Nov 2015 23:07:44 +0000 (00:07 +0100)]
parisc: Map kernel text and data on huge pages
Adjust the linker script and map_pages() to map kernel text and data on
physical 1MB huge/large pages.
Signed-off-by: Helge Deller <deller@gmx.de>
Helge Deller [Sat, 21 Nov 2015 23:07:06 +0000 (00:07 +0100)]
parisc: Add Huge Page and HUGETLBFS support
This patch adds huge page support to allow userspace to allocate huge
pages and to use hugetlbfs filesystem on 32- and 64-bit Linux kernels.
A later patch will add kernel support to map kernel text and data on
huge pages.
The only requirement is, that the kernel needs to be compiled for a
PA8X00 CPU (PA2.0 architecture). Older PA1.X CPUs do not support
variable page sizes. 64bit Kernels are compiled for PA2.0 by default.
Technically on parisc multiple physical huge pages may be needed to
emulate standard 2MB huge pages.
Signed-off-by: Helge Deller <deller@gmx.de>
Helge Deller [Fri, 20 Nov 2015 10:22:32 +0000 (11:22 +0100)]
parisc: Use long branch to do_syscall_trace_exit
Use the 22bit instead of the 17bit branch instruction on a 64bit kernel
to reach the do_syscall_trace_exit function from the gateway page.
A huge page enabled kernel may need the additional branch distance bits.
Signed-off-by: Helge Deller <deller@gmx.de>
Helge Deller [Fri, 20 Nov 2015 10:17:27 +0000 (11:17 +0100)]
parisc: Increase initial kernel mapping to 32MB on 64bit kernel
For the 64bit kernel the initially 16 MB kernel memory might become too
small if you build a kernel with many modules built-in and with kernel
text and data areas mapped on huge pages.
This patch increases the initial mapping to 32MB for 64bit kernels and
keeps 16MB for 32bit kernels.
Signed-off-by: Helge Deller <deller@gmx.de>
Helge Deller [Fri, 20 Nov 2015 09:50:01 +0000 (10:50 +0100)]
parisc: Initialize the fault vector earlier in the boot process.
A fault vector on parisc needs to be 2K aligned. Furthermore the
checksum of the fault vector needs to sum up to 0 which is being
calculated and written at runtime.
Up to now we aligned both PA20 and PA11 fault vectors on the same 4K
page in order to easily write the checksum after having mapped the
kernel read-only (by mapping this page only as read-write).
But when we want to map the kernel text and data on huge pages this
makes things harder.
So, simplify it by aligning both fault vectors on 2K boundries and write
the checksum before we map the page read-only.
Signed-off-by: Helge Deller <deller@gmx.de>
Helge Deller [Fri, 20 Nov 2015 14:46:52 +0000 (15:46 +0100)]
parisc: Add defines for Huge page support
Huge pages on parisc will have the same size as one pmd table, which
is on a 64bit kernel 2MB on a kernel with 4K kernel page sizes, and
on a 32bit kernel 4MB when used with 4K kernel pages.
Since parisc does not physically supports 2MB huge page sizes, emulate
it with two consecutive 1MB page sizes instead. Keeping the same huge
page size as one pmd will allow us to add transparent huge page support
later on.
Bit 21 in the pte flags was unused and will now be used to mark a page
as huge page (_PAGE_HPAGE_BIT).
Signed-off-by: Helge Deller <deller@gmx.de>
Helge Deller [Sun, 22 Nov 2015 11:14:14 +0000 (12:14 +0100)]
parisc: Drop unused MADV_xxxK_PAGES flags from asm/mman.h
Drop the MADV_xxK_PAGES flags, which were never used and were from a proposed
API which was never integrated into the generic Linux kernel code.
Cc: stable@vger.kernel.org
Signed-off-by: Helge Deller <deller@gmx.de>
Linus Torvalds [Sat, 21 Nov 2015 18:49:13 +0000 (10:49 -0800)]
Merge branch 'akpm' (patches from Andrew)
Merge misc fixes from Andrew Morton:
"A bunch of fixes"
* emailed patches from Andrew Morton <akpm@linux-foundation.org>:
slub: mark the dangling ifdef #else of CONFIG_SLUB_DEBUG
slub: avoid irqoff/on in bulk allocation
slub: create new ___slab_alloc function that can be called with irqs disabled
mm: fix up sparse warning in gfpflags_allow_blocking
ocfs2: fix umask ignored issue
PM/OPP: add entry in MAINTAINERS
kernel/panic.c: turn off locks debug before releasing console lock
kernel/signal.c: unexport sigsuspend()
kasan: fix kmemleak false-positive in kasan_module_alloc()
fat: fix fake_offset handling on error path
mm/hugetlbfs: fix bugs in fallocate hole punch of areas with holes
mm/page-writeback.c: initialize m_dirty to avoid compile warning
various: fix pci_set_dma_mask return value checking
mm: loosen MADV_NOHUGEPAGE to enable Qemu postcopy on s390
mm: vmalloc: don't remove inexistent guard hole in remove_vm_area()
tools/vm/page-types.c: support KPF_IDLE
ncpfs: don't allow negative timeouts
configfs: allow dynamic group creation
MAINTAINERS: add Moritz as reviewer for FPGA Manager Framework
slab.h: sprinkle __assume_aligned attributes
Linus Torvalds [Sat, 21 Nov 2015 18:26:24 +0000 (10:26 -0800)]
Merge branch 'timers-urgent-for-linus' of git://git./linux/kernel/git/tip/tip
Pull timer fixes from Thomas Gleixner:
"Two timer fixlets from Arnd:
- Use proper constant size in the FSL timer driver
- Prevent a build error for legacy platforms"
* 'timers-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
clocksource: Disallow drivers for ARCH_USES_GETTIMEOFFSET
clocksource/fsl: Avoid harmless 64-bit warnings
Linus Torvalds [Sat, 21 Nov 2015 18:19:15 +0000 (10:19 -0800)]
Merge branch 'irq-urgent-for-linus' of git://git./linux/kernel/git/tip/tip
Pull irq fixes from Thomas Gleixner:
"Three fixes for the ARM GIC interrupt controller from Marc addressing
various shortcomings versus boot initialization and suspend/resume"
* 'irq-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
irqchip/gic: Add save/restore of the active state
irqchip/gic: Clear enable bits before restoring them
irqchip/gic: Make sure all interrupts are deactivated at boot
Linus Torvalds [Sat, 21 Nov 2015 17:52:07 +0000 (09:52 -0800)]
Merge tag 'for-linus-
20151120' of git://git.infradead.org/linux-mtd
Pull MTD fixes from Brian Norris:
- MAINTAINERS updates for brcmnand driver
- Fix reboot hangs seen when multiple NAND flash chips are registered
with the same controller
- Fix build issues on jz4740 NAND driver; the error was introduced in
4.3, so I guess nobody really cared, but we might as well fix it
* tag 'for-linus-
20151120' of git://git.infradead.org/linux-mtd:
MAINTAINERS: brcmnand: Add co-maintainer for Broadcom SoCs
MAINTAINERS: brcmnand: Add Broadcom internal mailing-list
mtd: nand: fix shutdown/reboot for multi-chip systems
mtd: jz4740_nand: fix build on jz4740 after removing gpio.h
Arnd Bergmann [Mon, 16 Nov 2015 15:48:09 +0000 (16:48 +0100)]
serial: export fsl8250_handle_irq
fsl8250_handle_irq is now used by the of_serial driver, and that fails
if it is a loadable module:
ERROR: "fsl8250_handle_irq" [drivers/tty/serial/of_serial.ko] undefined!
This exports the symbol to avoid randconfig errors.
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Fixes:
d43b54d269d2 ("serial: Enable Freescale 16550 workaround on arm")
Cc: Scott Wood <scottwood@freescale.com>
Signed-off-by: Jeff Mahoney <jeffm@suse.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Heikki Krogerus [Thu, 12 Nov 2015 13:21:23 +0000 (15:21 +0200)]
serial: 8250_mid: Add missing dependency
8250_mid uses rational_best_approximation() function, so the
driver needs to select CONFIG_RATIONAL option.
This fixes build error when CONFIG_RATIONAL is not enabled:
drivers/built-in.o: In function `mid8250_set_termios':
8250_mid.c:(.text+0x10169a): undefined reference to `rational_best_approximation'
Reported-by: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Acked-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Peter Hurley [Sun, 8 Nov 2015 13:52:31 +0000 (08:52 -0500)]
tty: audit: Fix audit source
The data to audit/record is in the 'from' buffer (ie., the input
read buffer).
Fixes:
72586c6061ab ("n_tty: Fix auditing support for cannonical mode")
Cc: stable <stable@vger.kernel.org> # 4.1+
Cc: Miloslav Trmač <mitr@redhat.com>
Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Acked-by: Laura Abbott <labbott@fedoraproject.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Guenter Roeck [Mon, 2 Nov 2015 02:32:56 +0000 (18:32 -0800)]
serial: etraxfs-uart: Fix crash
Since commit
7d8c70d8048c ("serial: mctrl-gpio: rename init function"),
crisv32 either do not build or crash as follows.
Unable to handle kernel NULL pointer dereference
Linux 4.3.0-rc7-next-
20151101 #1 Sun Nov 1 11:41:28 PST 2015
...
Call Trace: [<
c0004a0e>] show_stack+0x0/0x9e
[<
c004c0c0>] printk+0x0/0x2c
[<
c00059d4>] show_registers+0x14a/0x1c2
[<
c004c0c0>] printk+0x0/0x2c
[<
c0004b52>] die_if_kernel+0x7c/0x9e
[<
c0005346>] do_page_fault+0x32e/0x3e6
[<
c01dc59c>] of_get_property+0x0/0x2c
[<
c01e0558>] of_irq_parse_raw+0x12a/0x376
[<
c01dc59c>] of_get_property+0x0/0x2c
[<
c0053aca>] get_page_from_freelist+0x73e/0x856
[<
c01dc59c>] of_get_property+0x0/0x2c
[<
c0008912>] d_mmu_refill+0x10a/0x112
[<
c01b488c>] devm_kmalloc+0x40/0x56
[<
c01b47d0>] add_dr+0xc/0x1c
[<
c01b4800>] devm_add_action+0x2/0x4e
[<
c01abdbc>] mctrl_gpio_init_noauto+0x1c/0x76
[<
c01abf9e>] mctrl_gpio_init+0x22/0x110
The function call in the etraxfs-uart driver was not renamed,
possibly due to interference with commit
7b9c5162c182 ("serial:
etraxfs-uart: use mctrl_gpio helpers for handling modem signals").
Fixes:
7d8c70d8048c ("serial: mctrl-gpio: rename init function")
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Acked-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Acked-by: Niklas Cassel <nks@flawful.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Peter Hurley [Tue, 20 Oct 2015 13:55:21 +0000 (09:55 -0400)]
serial: fsl_lpuart: Fix earlycon support
Earlycon support for Freescale lpuart should only be enabled when
console support is enabled.
Fixes:
1d59b382f1c4 ("serial: fsl_lpuart: add earlycon support")
Acked-by: Stefan Agner <stefan@agner.ch>
Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Simon Arlott [Sun, 15 Nov 2015 16:14:32 +0000 (16:14 +0000)]
bcm63xx_uart: Use the device name when registering an interrupt
Use the device name when registering an interrupt so that multiple
ports don't all have the same interrupt name.
Signed-off-by: Simon Arlott <simon@fire.lp0.eu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Peter Hurley [Sun, 8 Nov 2015 12:53:06 +0000 (07:53 -0500)]
tty: Fix direct use of tty buffer work
Recent abstraction of tty buffer work introduced api to manage
tty input kworker; use it.
Fixes:
e176058f0de5 ("tty: Abstract tty buffer work")
Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Peter Hurley [Wed, 11 Nov 2015 13:03:54 +0000 (08:03 -0500)]
tty: Fix tty_send_xchar() lock order inversion
The correct lock order is atomic_write_lock => termios_rwsem, as
established by tty_write() => n_tty_write().
Fixes:
c274f6ef1c666 ("tty: Hold termios_rwsem for tcflow(TCIxxx)")
Reported-and-Tested-by: Dmitry Vyukov <dvyukov@google.com>
Cc: <stable@vger.kernel.org> # v3.18+
Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Jesper Dangaard Brouer [Fri, 20 Nov 2015 23:57:41 +0000 (15:57 -0800)]
slub: mark the dangling ifdef #else of CONFIG_SLUB_DEBUG
The #ifdef of CONFIG_SLUB_DEBUG is located very far from the associated
#else. For readability mark it with a comment.
Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com>
Acked-by: Christoph Lameter <cl@linux.com>
Cc: Pekka Enberg <penberg@kernel.org>
Cc: David Rientjes <rientjes@google.com>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Cc: Alexander Duyck <alexander.h.duyck@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Christoph Lameter [Fri, 20 Nov 2015 23:57:38 +0000 (15:57 -0800)]
slub: avoid irqoff/on in bulk allocation
Use the new function that can do allocation while interrupts are disabled.
Avoids irq on/off sequences.
Signed-off-by: Christoph Lameter <cl@linux.com>
Cc: Jesper Dangaard Brouer <brouer@redhat.com>
Cc: Pekka Enberg <penberg@kernel.org>
Cc: David Rientjes <rientjes@google.com>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Cc: Alexander Duyck <alexander.h.duyck@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Christoph Lameter [Fri, 20 Nov 2015 23:57:35 +0000 (15:57 -0800)]
slub: create new ___slab_alloc function that can be called with irqs disabled
Bulk alloc needs a function like that because it enables interrupts before
calling __slab_alloc which promptly disables them again using the expensive
local_irq_save().
Signed-off-by: Christoph Lameter <cl@linux.com>
Cc: Jesper Dangaard Brouer <brouer@redhat.com>
Cc: Pekka Enberg <penberg@kernel.org>
Cc: David Rientjes <rientjes@google.com>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Cc: Alexander Duyck <alexander.h.duyck@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Jeff Layton [Fri, 20 Nov 2015 23:57:32 +0000 (15:57 -0800)]
mm: fix up sparse warning in gfpflags_allow_blocking
sparse says:
include/linux/gfp.h:274:26: warning: incorrect type in return expression (different base types)
include/linux/gfp.h:274:26: expected bool
include/linux/gfp.h:274:26: got restricted gfp_t
...add a forced cast to silence the warning.
Signed-off-by: Jeff Layton <jeff.layton@primarydata.com>
Cc: Mel Gorman <mgorman@techsingularity.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Junxiao Bi [Fri, 20 Nov 2015 23:57:30 +0000 (15:57 -0800)]
ocfs2: fix umask ignored issue
New created file's mode is not masked with umask, and this makes umask not
work for ocfs2 volume.
Fixes:
702e5bc ("ocfs2: use generic posix ACL infrastructure")
Signed-off-by: Junxiao Bi <junxiao.bi@oracle.com>
Cc: Gang He <ghe@suse.com>
Cc: Mark Fasheh <mfasheh@suse.de>
Cc: Joel Becker <jlbec@evilplan.org>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Viresh Kumar [Fri, 20 Nov 2015 23:57:27 +0000 (15:57 -0800)]
PM/OPP: add entry in MAINTAINERS
Add entry for operating performance points into MAINTAINERS file. This
will also allow get_maintainers to list OPP stakeholders properly.
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Acked-by: Stephen Boyd <sboyd@codeaurora.org>
Cc: Rafael Wysocki <rjw@rjwysocki.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Vitaly Kuznetsov [Fri, 20 Nov 2015 23:57:24 +0000 (15:57 -0800)]
kernel/panic.c: turn off locks debug before releasing console lock
Commit
08d78658f393 ("panic: release stale console lock to always get the
logbuf printed out") introduced an unwanted bad unlock balance report when
panic() is called directly and not from OOPS (e.g. from out_of_memory()).
The difference is that in case of OOPS we disable locks debug in
oops_enter() and on direct panic call nobody does that.
Fixes:
08d78658f393 ("panic: release stale console lock to always get the logbuf printed out")
Reported-by: kernel test robot <ying.huang@linux.intel.com>
Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Cc: HATAYAMA Daisuke <d.hatayama@jp.fujitsu.com>
Cc: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Cc: Jiri Kosina <jkosina@suse.cz>
Cc: Baoquan He <bhe@redhat.com>
Cc: Prarit Bhargava <prarit@redhat.com>
Cc: Xie XiuQi <xiexiuqi@huawei.com>
Cc: Seth Jennings <sjenning@redhat.com>
Cc: "K. Y. Srinivasan" <kys@microsoft.com>
Cc: Jan Kara <jack@suse.cz>
Cc: Petr Mladek <pmladek@suse.cz>
Cc: Yasuaki Ishimatsu <isimatu.yasuaki@jp.fujitsu.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Richard Weinberger [Fri, 20 Nov 2015 23:57:21 +0000 (15:57 -0800)]
kernel/signal.c: unexport sigsuspend()
sigsuspend() is nowhere used except in signal.c itself, so we can mark it
static do not pollute the global namespace.
But this patch is more than a boring cleanup patch, it fixes a real issue
on UserModeLinux. UML has a special console driver to display ttys using
xterm, or other terminal emulators, on the host side. Vegard reported
that sometimes UML is unable to spawn a xterm and he's facing the
following warning:
WARNING: CPU: 0 PID: 908 at include/linux/thread_info.h:128 sigsuspend+0xab/0xc0()
It turned out that this warning makes absolutely no sense as the UML
xterm code calls sigsuspend() on the host side, at least it tries. But
as the kernel itself offers a sigsuspend() symbol the linker choose this
one instead of the glibc wrapper. Interestingly this code used to work
since ever but always blocked signals on the wrong side. Some recent
kernel change made the WARN_ON() trigger and uncovered the bug.
It is a wonderful example of how much works by chance on computers. :-)
Fixes:
68f3f16d9ad0f1 ("new helper: sigsuspend()")
Signed-off-by: Richard Weinberger <richard@nod.at>
Reported-by: Vegard Nossum <vegard.nossum@oracle.com>
Tested-by: Vegard Nossum <vegard.nossum@oracle.com>
Acked-by: Oleg Nesterov <oleg@redhat.com>
Cc: <stable@vger.kernel.org> [3.5+]
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Andrey Ryabinin [Fri, 20 Nov 2015 23:57:18 +0000 (15:57 -0800)]
kasan: fix kmemleak false-positive in kasan_module_alloc()
Kmemleak reports the following leak:
unreferenced object 0xfffffbfff41ea000 (size 20480):
comm "modprobe", pid 65199, jiffies
4298875551 (age 542.568s)
hex dump (first 32 bytes):
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
backtrace:
[<
ffffffff82354f5e>] kmemleak_alloc+0x4e/0xc0
[<
ffffffff8152e718>] __vmalloc_node_range+0x4b8/0x740
[<
ffffffff81574072>] kasan_module_alloc+0x72/0xc0
[<
ffffffff810efe68>] module_alloc+0x78/0xb0
[<
ffffffff812f6a24>] module_alloc_update_bounds+0x14/0x70
[<
ffffffff812f8184>] layout_and_allocate+0x16f4/0x3c90
[<
ffffffff812faa1f>] load_module+0x2ff/0x6690
[<
ffffffff813010b6>] SyS_finit_module+0x136/0x170
[<
ffffffff8239bbc9>] system_call_fastpath+0x16/0x1b
[<
ffffffffffffffff>] 0xffffffffffffffff
kasan_module_alloc() allocates shadow memory for module and frees it on
module unloading. It doesn't store the pointer to allocated shadow memory
because it could be calculated from the shadowed address, i.e.
kasan_mem_to_shadow(addr).
Since kmemleak cannot find pointer to allocated shadow, it thinks that
memory leaked.
Use kmemleak_ignore() to tell kmemleak that this is not a leak and shadow
memory doesn't contain any pointers.
Signed-off-by: Andrey Ryabinin <aryabinin@virtuozzo.com>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
OGAWA Hirofumi [Fri, 20 Nov 2015 23:57:15 +0000 (15:57 -0800)]
fat: fix fake_offset handling on error path
For the root directory, . and .. are faked (using dir_emit_dots()) and
ctx->pos is reset from 2 to 0.
A corrupted root directory could cause fat_get_entry() to fail, but
->iterate() (fat_readdir()) reports progress to the VFS (with ctx->pos
rewound to 0), so any following calls to ->iterate() continue to return
the same entries again and again.
The result is that userspace will never see the end of the directory,
causing e.g. 'ls' to hang in a getdents() loop.
[hirofumi@mail.parknet.co.jp: cleanup and make sure to correct fake_offset]
Reported-by: Vegard Nossum <vegard.nossum@oracle.com>
Tested-by: Vegard Nossum <vegard.nossum@oracle.com>
Signed-off-by: Richard Weinberger <richard.weinberger@gmail.com>
Signed-off-by: OGAWA Hirofumi <hirofumi@mail.parknet.co.jp>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Mike Kravetz [Fri, 20 Nov 2015 23:57:13 +0000 (15:57 -0800)]
mm/hugetlbfs: fix bugs in fallocate hole punch of areas with holes
Hugh Dickins pointed out problems with the new hugetlbfs fallocate hole
punch code. These problems are in the routine remove_inode_hugepages and
mostly occur in the case where there are holes in the range of pages to be
removed. These holes could be the result of a previous hole punch or
simply sparse allocation. The current code could access pages outside the
specified range.
remove_inode_hugepages handles both hole punch and truncate operations.
Page index handling was fixed/cleaned up so that the loop index always
matches the page being processed. The code now only makes a single pass
through the range of pages as it was determined page faults could not race
with truncate. A cond_resched() was added after removing up to
PAGEVEC_SIZE pages.
Some totally unnecessary code in hugetlbfs_fallocate() that remained from
early development was also removed.
Tested with fallocate tests submitted here:
http://librelist.com/browser//libhugetlbfs/2015/6/25/patch-tests-add-tests-for-fallocate-system-call/
And, some ftruncate tests under development
Fixes:
b5cec28d36f5 ("hugetlbfs: truncate_hugepages() takes a range of pages")
Signed-off-by: Mike Kravetz <mike.kravetz@oracle.com>
Acked-by: Hugh Dickins <hughd@google.com>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Cc: Davidlohr Bueso <dave@stgolabs.net>
Cc: "Hillf Danton" <hillf.zj@alibaba-inc.com>
Cc: <stable@vger.kernel.org> [4.3]
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Yang Shi [Fri, 20 Nov 2015 23:57:10 +0000 (15:57 -0800)]
mm/page-writeback.c: initialize m_dirty to avoid compile warning
When building kernel with gcc 5.2, the below warning is raised:
mm/page-writeback.c: In function 'balance_dirty_pages.isra.10':
mm/page-writeback.c:1545:17: warning: 'm_dirty' may be used uninitialized in this function [-Wmaybe-uninitialized]
unsigned long m_dirty, m_thresh, m_bg_thresh;
The m_dirty{thresh, bg_thresh} are initialized in the block of "if
(mdtc)", so if mdts is null, they won't be initialized before being used.
Initialize m_dirty to zero, also initialize m_thresh and m_bg_thresh to
keep consistency.
They are used later by if condition: !mdtc || m_dirty <=
dirty_freerun_ceiling(m_thresh, m_bg_thresh)
If mdtc is null, dirty_freerun_ceiling will not be called at all, so the
initialization will not change any behavior other than just ceasing the
compile warning.
(akpm: the patch actually reduces .text size by ~20 bytes on gcc-4.x.y)
[akpm@linux-foundation.org: add comment]
Signed-off-by: Yang Shi <yang.shi@linaro.org>
Cc: Tejun Heo <tj@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Christoph Hellwig [Fri, 20 Nov 2015 23:57:07 +0000 (15:57 -0800)]
various: fix pci_set_dma_mask return value checking
pci_set_dma_mask returns a negative errno value, not a bool like
pci_dma_supported. This of course was just a giant test for attention :)
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reported-by: Jongman Heo <jongman.heo@samsung.com>
Tested-by: Jongman Heo <jongman.heo@samsung.com> [pcnet32]
Acked-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
Cc: Hans Verkuil <hverkuil@xs4all.nl>
Cc: Antti Palosaari <crope@iki.fi>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Jason J. Herne [Fri, 20 Nov 2015 23:57:04 +0000 (15:57 -0800)]
mm: loosen MADV_NOHUGEPAGE to enable Qemu postcopy on s390
MADV_NOHUGEPAGE processing is too restrictive. kvm already disables
hugepage but hugepage_madvise() takes the error path when we ask to turn
on the MADV_NOHUGEPAGE bit and the bit is already on. This causes Qemu's
new postcopy migration feature to fail on s390 because its first action is
to madvise the guest address space as NOHUGEPAGE. This patch modifies the
code so that the operation succeeds without error now.
For consistency reasons do the same for MADV_HUGEPAGE.
Signed-off-by: Jason J. Herne <jjherne@linux.vnet.ibm.com>
Reviewed-by: Andrea Arcangeli <aarcange@redhat.com>
Acked-by: Christian Borntraeger <borntraeger@de.ibm.com>
Acked-by: David Rientjes <rientjes@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Jerome Marchand [Fri, 20 Nov 2015 23:57:02 +0000 (15:57 -0800)]
mm: vmalloc: don't remove inexistent guard hole in remove_vm_area()
Commit
71394fe50146 ("mm: vmalloc: add flag preventing guard hole
allocation") missed a spot. Currently remove_vm_area() decreases vm->size
to "remove" the guard hole page, even when it isn't present. All but one
users just free the vm_struct rigth away and never access vm->size anyway.
Don't touch the size in remove_vm_area() and have __vunmap() use the
proper get_vm_area_size() helper.
Signed-off-by: Jerome Marchand <jmarchan@redhat.com>
Acked-by: Andrey Ryabinin <aryabinin@virtuozzo.com>
Acked-by: David Rientjes <rientjes@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Naoya Horiguchi [Fri, 20 Nov 2015 23:56:59 +0000 (15:56 -0800)]
tools/vm/page-types.c: support KPF_IDLE
PageIdle is exported in include/uapi/linux/kernel-page-flags.h, so let's
make page-types.c tool handle it.
Signed-off-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Reviewed-by: Vladimir Davydov <vdavydov@virtuozzo.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Dan Carpenter [Fri, 20 Nov 2015 23:56:56 +0000 (15:56 -0800)]
ncpfs: don't allow negative timeouts
This code causes a static checker warning because it's a user controlled
variable where we cap the upper bound but not the lower bound. Let's
return an -EINVAL for negative timeouts.
[akpm@linux-foundation.org: remove unneeded `else']
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Reviewed-by: Jan Kara <jack@suse.com>
Cc: Petr Vandrovec <petr@vandrovec.name>
Cc: David Howells <dhowells@redhat.com>
Cc: Jan Kara <jack@suse.cz>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Daniel Baluta [Fri, 20 Nov 2015 23:56:53 +0000 (15:56 -0800)]
configfs: allow dynamic group creation
This patchset introduces IIO software triggers, offers a way of configuring
them via configfs and adds the IIO hrtimer based interrupt source to be used
with software triggers.
The architecture is now split in 3 parts, to remove all IIO trigger specific
parts from IIO configfs core:
(1) IIO configfs - creates the root of the IIO configfs subsys.
(2) IIO software triggers - software trigger implementation, dynamically
creating /config/iio/triggers group.
(3) IIO hrtimer trigger - is the first interrupt source for software triggers
(with syfs to follow). Each trigger type can implement its own set of
attributes.
Lockdep seems to be happy with the locking in configfs patch.
This patch (of 5):
We don't want to hardcode default groups at subsystem
creation time. We export:
* configfs_register_group
* configfs_unregister_group
to allow drivers to programatically create/destroy groups
later, after module init time.
This is needed for IIO configfs support.
(akpm: the other 4 patches to be merged via the IIO tree)
Signed-off-by: Daniel Baluta <daniel.baluta@intel.com>
Suggested-by: Lars-Peter Clausen <lars@metafoo.de>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Acked-by: Joel Becker <jlbec@evilplan.org>
Cc: Hartmut Knaack <knaack.h@gmx.de>
Cc: Octavian Purdila <octavian.purdila@intel.com>
Cc: Paul Bolle <pebolle@tiscali.nl>
Cc: Adriana Reus <adriana.reus@intel.com>
Cc: Cristina Opriceana <cristina.opriceana@gmail.com>
Cc: Peter Meerwald <pmeerw@pmeerw.net>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Moritz Fischer [Fri, 20 Nov 2015 23:56:51 +0000 (15:56 -0800)]
MAINTAINERS: add Moritz as reviewer for FPGA Manager Framework
Nominate myself as Reviewer.
Signed-off-by: Moritz Fischer <moritz.fischer@ettus.com>
Acked-by: Alan Tull <atull@opensource.altera.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Rasmus Villemoes [Fri, 20 Nov 2015 23:56:48 +0000 (15:56 -0800)]
slab.h: sprinkle __assume_aligned attributes
The various allocators return aligned memory. Telling the compiler that
allows it to generate better code in many cases, for example when the
return value is immediately passed to memset().
Some code does become larger, but at least we win twice as much as we lose:
$ scripts/bloat-o-meter /tmp/vmlinux vmlinux
add/remove: 0/0 grow/shrink: 13/52 up/down: 995/-2140 (-1145)
An example of the different (and smaller) code can be seen in mm_alloc(). Before:
: 48 8d 78 08 lea 0x8(%rax),%rdi
: 48 89 c1 mov %rax,%rcx
: 48 89 c2 mov %rax,%rdx
: 48 c7 00 00 00 00 00 movq $0x0,(%rax)
: 48 c7 80 48 03 00 00 movq $0x0,0x348(%rax)
: 00 00 00 00
: 31 c0 xor %eax,%eax
: 48 83 e7 f8 and $0xfffffffffffffff8,%rdi
: 48 29 f9 sub %rdi,%rcx
: 81 c1 50 03 00 00 add $0x350,%ecx
: c1 e9 03 shr $0x3,%ecx
: f3 48 ab rep stos %rax,%es:(%rdi)
After:
: 48 89 c2 mov %rax,%rdx
: b9 6a 00 00 00 mov $0x6a,%ecx
: 31 c0 xor %eax,%eax
: 48 89 d7 mov %rdx,%rdi
: f3 48 ab rep stos %rax,%es:(%rdi)
So gcc's strategy is to do two possibly (but not really, of course)
unaligned stores to the first and last word, then do an aligned rep stos
covering the middle part with a little overlap. Maybe arches which do not
allow unaligned stores gain even more.
I don't know if gcc can actually make use of alignments greater than 8 for
anything, so one could probably drop the __assume_xyz_alignment macros and
just use __assume_aligned(8).
The increases in code size are mostly caused by gcc deciding to
opencode strlen() using the check-four-bytes-at-a-time trick when it
knows the buffer is sufficiently aligned (one function grew by 200
bytes). Now it turns out that many of these strlen() calls showing up
were in fact redundant, and they're gone from -next. Applying the two
patches to next-
20151001 bloat-o-meter instead says
add/remove: 0/0 grow/shrink: 6/52 up/down: 244/-2140 (-1896)
Signed-off-by: Rasmus Villemoes <linux@rasmusvillemoes.dk>
Acked-by: Christoph Lameter <cl@linux.com>
Cc: David Rientjes <rientjes@google.com>
Cc: Pekka Enberg <penberg@kernel.org>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>