Commit graph

518753 commits

Author SHA1 Message Date
Mathias Krause e85dae7048 ASoC: intel: Constify ACPI device ids
Constify the ACPI device ID array, it doesn't need to be writable at
runtime.

Signed-off-by: Mathias Krause <minipli@googlemail.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
2015-06-15 11:32:07 +01:00
Fang, Yang A e8ed670274 ASoC: Intel: fixed TI button detection
In order to make TI button interrupt working max98090 codec
Need provide mic bias all the time as long as mic is present
so SHDN and micbias pin are forced on.we also need set max98090
codec bias close or lower than TI bias.We set them in bios/coreboot
kernel reads them from device property

Signed-off-by: Fang, Yang A <yang.a.fang@intel.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
2015-06-15 10:51:36 +01:00
Rasmus Villemoes 6846e18a1e ASoC: Intel: mrfld: simplify sst_fill_widget_module_info
Some tiny improvements, cutting 180 bytes off the generated code.

- use strchr() for single-character needle

- compute index using pointer subtraction instead of two strlen()
  calls

- factor out the common check for whether the initial part of
  kctl->id.name (before the space) is identical to w->name.

Signed-off-by: Rasmus Villemoes <linux@rasmusvillemoes.dk>
Acked-by: Vinod Koul <vinod.koul@intel.com>
Tested-by: Fang, Yang A <yang.a.fang@intel.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
2015-06-15 10:50:28 +01:00
Fang, Yang A fd35e37510 ASoC: Intel: Added I2C dependency to two BSW machine drivers
Fixed below error/warnings

   sound/built-in.o: In function `rt5645_i2c_probe':
>> rt5645.c:(.text+0xe38f5): undefined reference to
>> `devm_regmap_init_i2c'
   sound/built-in.o: In function `rt5645_i2c_driver_exit':
>> rt5645.c:(.exit.text+0x60e): undefined reference to `i2c_del_driver'
   sound/built-in.o: In function `rt5645_i2c_driver_init':
>> rt5645.c:(.init.text+0x1a90): undefined reference to
>> `i2c_register_driver'

Signed-off-by: Fang, Yang A <yang.a.fang@intel.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
2015-06-12 11:54:39 +01:00
Sebastian Andrzej Siewior 4decab1aff ASoC: Intel: sst: use ; instead of , at the of a C statement
This was spotted by Fernando Lopez-Lezcano <nando@ccrma.Stanford.EDU>
while he tried to compile a -RT kernel with this driver enabled.
"make C=2" would also warn about this. This is is based on his patch.

Reported-by: Fernando Lopez-Lezcano <nando@ccrma.Stanford.EDU>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Acked-by: Vinod Koul <vinod.koul@intel.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
2015-06-12 11:36:56 +01:00
Subhransu S. Prusty 859c34bd3c ASoC: Intel: Allocate for the mailbox with max size
Signed-off-by: Subhransu S. Prusty <subhransu.s.prusty@intel.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
2015-06-02 20:48:08 +01:00
Jie Yang edd8ed496b ASoC: Intel: handle haswell pcm suspend including runtime modules freeing
It needs free pcm runtime modules before unloading firmware, here
add hsw_pcm_suspend() to handle this procedure:
suspends firmware ==> frees runtime modules ==> unloads firmware.

This fixes the broadwell module unload failed issue.

Signed-off-by: Jie Yang <yang.jie@intel.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
2015-06-02 15:34:12 +01:00
Jie Yang 2dbc80caf7 ASoC: Intel: check and clear runtime module pointer
Add check runtime module pointers before freeing them, and clear
them to NULL after freed.

With this implemented, we can avoid NULL pointer dereference or
double free errors.

Signed-off-by: Jie Yang <yang.jie@intel.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
2015-06-02 15:34:11 +01:00
Jie Yang 6e5132f79a ASoC: intel: Revert "ASoC: Intel: fix broadwell module removing failed issue"
This reverts commit 01f202c7b4.

We shouldn't leave the device as suspended state after module freed,
it is not good to do runtime suspend at driver free, here revert
this fixing, and replace it with the procedure:
suspends firmware ==> frees runtime modules ==> unloads firmware.

Signed-off-by: Jie Yang <yang.jie@intel.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
2015-06-02 15:34:07 +01:00
Jie Yang a209d322dc ASoC: intel: Revert "ASoC: Intel: remove unused function hsw_pcm_free_modules()"
This reverts commit 506c148ee5.

We still need this hsw_pcm_free_modules(), we plan to remove the
runtime modules at both fw_unload(D0->D3) and snd_soc_sst_haswell_pcm
module removing.

Signed-off-by: Jie Yang <yang.jie@intel.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
2015-06-02 15:34:00 +01:00
Jie Yang 616268292b ASoC: Intel: don't need compress offload for broadwell
We don't need compress offload feature for broadwell broadwell machine,
here remove the non exist dependency.

Signed-off-by: Jie Yang <yang.jie@intel.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
2015-06-02 11:58:45 +01:00
Liam Girdwood 01f202c7b4 ASoC: Intel: fix broadwell module removing failed issue
In haswell-pcm module unloading, we can't free runtime modules
directly, for they may be already freed in runtime suspend.

Here add executing suspend call to unload runtime modules, only
for status not equal to RPM_SUSPEND, to fix broadwell module
removing failed issue.

Signed-off-by: Liam Girdwood <liam.r.girdwood@linux.intel.com>
Signed-off-by: Jie Yang <yang.jie@intel.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
2015-05-28 20:27:00 +01:00
Jie Yang 506c148ee5 ASoC: Intel: remove unused function hsw_pcm_free_modules()
Remove the unused function hsw_pcm_free_modules() to fix the
compling warning:

sound/soc/intel/haswell/sst-haswell-pcm.c:923:13:
 warning: 'sw_pcm_free_modules' defined but not used
 [-Wunused-function]
 static void hsw_pcm_free_modules(struct hsw_priv_data *pdata)

Signed-off-by: Jie Yang <yang.jie@intel.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
2015-05-28 16:05:05 +01:00
Subhransu S. Prusty d0e72cc0ac ASoC: Intel: Initialize max mailbox size for haswell
Signed-off-by: Subhransu S. Prusty <subhransu.s.prusty@intel.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
Acked-by: Liam Girdwood <liam.r.girdwood@linux.intel.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
2015-05-22 19:24:35 +01:00
Subhransu S. Prusty f99b26f0b4 ASoC: Intel: Initialize max mailbox size for baytrail
Signed-off-by: Subhransu S. Prusty <subhransu.s.prusty@intel.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
Acked-by: Liam Girdwood <liam.r.girdwood@linux.intel.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
2015-05-22 19:24:32 +01:00
Subhransu S. Prusty 1925e21961 ASoC: Intel: Allow to configure max size for mailbox data
Mailbox size can be different for different platforms. So allow the drivers
to configure the size.

Signed-off-by: Subhransu S. Prusty <subhransu.s.prusty@intel.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
Acked-by: Liam Girdwood <liam.r.girdwood@linux.intel.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
2015-05-22 19:24:29 +01:00
Subhransu S. Prusty a63faa58bd ASoC: Intel: Remove the direct register reference from common ipc
Signed-off-by: Subhransu S. Prusty <subhransu.s.prusty@intel.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
Acked-by: Liam Girdwood <liam.r.girdwood@linux.intel.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
2015-05-22 19:24:26 +01:00
Subhransu S. Prusty 40fea92107 ASoC: Intel: Move the busy check to ops for HSW
Signed-off-by: Subhransu S. Prusty <subhransu.s.prusty@intel.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
Acked-by: Liam Girdwood <liam.r.girdwood@linux.intel.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
2015-05-22 19:24:23 +01:00
Subhransu S. Prusty 2709bdbc4d ASoC: Intel: Move the busy check to ops for Baytrail
Signed-off-by: Subhransu S. Prusty <subhransu.s.prusty@intel.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
Acked-by: Liam Girdwood <liam.r.girdwood@linux.intel.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
2015-05-22 19:24:20 +01:00
Subhransu S. Prusty 6022d330a5 ASoC: Intel: Create an ops to check for DSP busy
Created an ops to check if DSP busy, to avoid using platform
specific registers in common IPC.

Signed-off-by: Subhransu S. Prusty <subhransu.s.prusty@intel.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
Acked-by: Liam Girdwood <liam.r.girdwood@linux.intel.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
2015-05-22 19:24:10 +01:00
Vinod Koul 83f125e2a1 ASoC: Intel: add support for configuring TDM slots for SSP
With this machines can now configure TDM settings for SSP port using
set_tdm_slot API

Signed-off-by: Praveen Diwakar <praveen.diwakar@intel.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
2015-05-06 19:50:22 +01:00
Vinod Koul 0b44e34549 ASoC: intel: add support for specifying PCM format
With this machines can configure the PCM format applied on SSP port using
the set_fmt API

Signed-off-by: Praveen Diwakar <praveen.diwakar@intel.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
2015-05-06 19:50:22 +01:00
Vinod Koul 711bc9476b ASoC: Intel: load hw_defaults in hw_params of ssp be
We have the SSP defaults now and we need to load then in hw_params callback
of BE SSP DAI ops.

Signed-off-by: Praveen Diwakar <praveen.diwakar@intel.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
2015-05-06 19:50:22 +01:00
Vinod Koul 5749d70edc ASoC: Intel: use local values for ssp configuration
So right now SSP configuration is statically coded in the driver. While we
would like to keep this configuration intact for the users who are using
these defaults, we need to provide a way for users to program it.
So create a local value in driver structure which is populate with default
value for now

Signed-off-by: Praveen Diwakar <praveen.diwakar@intel.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
2015-05-06 19:50:22 +01:00
Vinod Koul 1f2d86f1c0 ASoC: Intel: add frame and data polarity to ssp config
The current ssp configuration was not configuring the frame sync polarity
and data polarity. Some codecs do need these different so add them in ssp
configuration now

Signed-off-by: Praveen Diwakar <praveen.diwakar@intel.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
2015-05-06 19:50:22 +01:00
Fang, Yang A 673c4f896a ASoC: Intel: Enabled button jack for BSW platform with rt5650 codec
rt5650 codec supports 4 buttons detections so enabled it

Signed-off-by: Fang, Yang A <yang.a.fang@intel.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
2015-05-06 11:58:29 +01:00
Mark Brown 292d2497cd Merge branch 'topic/rt5645' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/sound into asoc-intel 2015-05-06 11:58:24 +01:00
Fang, Yang A 26f63c692f ASoC: Intel: Fixed kbuild warnings
fix following sparse warnings: (new ones prefixed by >>)

>> sound/soc/intel/boards/cht_bsw_max98090_ti.c:168:37: sparse:
>> incorrect type in argument 2 (different base types)
   sound/soc/intel/boards/cht_bsw_max98090_ti.c:168:37:    expected
unsigned int [unsigned] val
   sound/soc/intel/boards/cht_bsw_max98090_ti.c:168:37:    got
restricted snd_pcm_format_t [usertype] <noident>

Signed-off-by: Fang, Yang A <yang.a.fang@intel.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
2015-05-05 12:17:58 +01:00
Fang, Yang A c4ba51ba1c ASoC: Intel: Support rt5650 codec for Cherrytrail & Braswell
rt5650 and rt5645 are similar codec so reuse the cht_bsw_rt5645 driver

Signed-off-by: Fang, Yang A <yang.a.fang@intel.com>
Acked-by: Vinod Koul <vinod.koul@intel.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
2015-05-04 18:13:59 +01:00
Fang, Yang A 17119a4657 ASoC: Intel: Add Cherrytrail & Braswell machine driver cht_bsw_max98090_ti
Add machine driver for two Intel Cherryview-based platforms, Cherrytrail
and Braswell. This machine driver will support max98090 codec as primary
codec. it can also support TI jack detect chip as aux device if platform
supports it.

Signed-off-by: Fang, Yang A <yang.a.fang@intel.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
2015-05-04 13:18:03 +01:00
Fang, Yang A cde7fbfc8a ASoC: Intel: Add support max98090 in sst driver
Added entry in sst driver to support max98090 codec
for intel Braswell platform.

Signed-off-by: Fang, Yang A <yang.a.fang@intel.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
2015-05-04 13:15:48 +01:00
Bard Liao 177e1e1fbc ASoC: rt5645: make volume TLV closer to reality
The volume blocks have an step of 0.375dB, but TLV uses 0.01dB for
units.  Only use the resolution supported, ignoring the LSB of the
volume register.  This results in half the steps and 0.75dB per step,
but reports accurate levels through TLV.

Signed-off-by: Bard Liao <bardliao@realtek.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
2015-05-01 17:33:49 +01:00
Bard Liao 21ab3f2bef ASoC: rt5645: add TDM slot control into dapm route
This patch adds TDM slot control into dapm route. The control bits
are different between rt5645 and rt5650, so we have separate dapm
routes for each codec.

Signed-off-by: Oder Chiou <oder_chiou@realtek.com>
Signed-off-by: Bard Liao <bardliao@realtek.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
2015-05-01 17:33:47 +01:00
Bard Liao de97c15b3c ASoC: rt5645: fix PLL source register definitions
Fix PLL source register definitions.

Signed-off-by: Bard Liao <bardliao@realtek.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
2015-05-01 17:33:47 +01:00
Bard Liao 33de3d54b8 ASoC: rt5645: remove RT5645_I2S_BCLK_MS1 control
RT5645_I2S_BCLK_MS1 (reg 0x73 [5]) is reserverd in rt5645 and rt5650.
This function is move to TDM control. We can configure it by
snd_soc_dai_set_tdm_slot's slot_width parameter.

Signed-off-by: Bard Liao <bardliao@realtek.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
2015-05-01 17:33:47 +01:00
Bard Liao e0b5d90669 ASoC: rt5645: fix wrong mask for button report
rt5645->btn_jack is for jack button report. So the mask should be
SND_JACK_BTN_0 | SND_JACK_BTN_1 | SND_JACK_BTN_2 | SND_JACK_BTN_3.

Signed-off-by: Bard Liao <bardliao@realtek.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
2015-05-01 17:33:47 +01:00
Bard Liao d5660422ca ASoC: rt5645: fix implicit declaration error
kbuild robot reports a implicit declaration of function
'rt5645_irq_detection' error.

Signed-off-by: Bard Liao <bardliao@realtek.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
2015-04-30 10:45:50 +01:00
Bard Liao 6e747d5311 ASoC: rt5645: Adds push button support for rt5650
rt5650 support headset button detection. Currently, the button detection
is only implemented for rt5650 codec. The button detection configuration
register's default value is different from rt5645.
And we didn't touch the register in the driver, so we will get the wrong
value when we dump the registers. We will fix it in another patch.

Signed-off-by: Bard Liao <bardliao@realtek.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
2015-04-29 12:18:52 +01:00
Sudip Mukherjee c0d44e59c2 ASoC: rt5645: fixed section mismatch
while building as a module we are getting warning about
section mismatch.

Signed-off-by: Sudip Mukherjee <sudip@vectorindia.org>
Signed-off-by: Mark Brown <broonie@kernel.org>
2015-04-28 16:49:47 +01:00
Fang, Yang A baf2a0e1c9 ASoC: rt5645: fixed kbuild err
kbuild robot reports following error/warnings

   sound/soc/codecs/rt5645.c: In function 'rt5645_i2c_probe':
>> sound/soc/codecs/rt5645.c:2720:4: error: implicit declaration of
>> function 'devm_gpiod_get_index'
>> [-Werror=implicit-function-declaration]
       gpiod = devm_gpiod_get_index(&i2c->dev, "rt5645", 0);
       ^
>> sound/soc/codecs/rt5645.c:2720:10: warning: assignment makes pointer
>> from integer without a cast
       gpiod = devm_gpiod_get_index(&i2c->dev, "rt5645", 0);
             ^
>> sound/soc/codecs/rt5645.c:2722:4: error: implicit declaration of
>> function 'gpiod_direction_input'
>> [-Werror=implicit-function-declaration]
       if (IS_ERR(gpiod) || gpiod_direction_input(gpiod)) {
       ^
>> sound/soc/codecs/rt5645.c:2726:5: error: implicit declaration of
>> function 'desc_to_gpio' [-Werror=implicit-function-declaration]
        rt5645->pdata.hp_det_gpio = desc_to_gpio(gpiod);
        ^
>> sound/soc/codecs/rt5645.c:2728:7: error: implicit declaration of
>> function 'gpiod_is_active_low'
>> [-Werror=implicit-function-declaration]
          = !gpiod_is_active_low(gpiod);
          ^
   cc1: some warnings being treated as errors

Signed-off-by: Fang, Yang A <yang.a.fang@intel.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
2015-04-28 00:24:27 +01:00
Fang, Yang A 78c34fd42e ASoC: rt5645: set platform data base on DMI
set platform specific data for intel strago platform

Signed-off-by: Fang, Yang A <yang.a.fang@intel.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
2015-04-27 22:00:34 +01:00
Mark Brown 10bb15a9a5 Merge branch 'fix/rt5645' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/sound into asoc-rt5645 2015-04-27 22:00:30 +01:00
Axel Lin 53f9b3baa9 ASoC: rt5645: Fix mask for setting RT5645_DMIC_2_DP_GPIO12 bit
Current code uses wrong mask when setting RT5645_DMIC_2_DP_GPIO12 bit,
fix it.

Signed-off-by: Axel Lin <axel.lin@ingics.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
2015-04-27 20:58:46 +01:00
Fang, Yang A 044d9601a9 ASoC: Intel: Add support rt5650 in sst driver
Added entry in sst driver to support rt5650 codec
for intel Braswell platform.

Signed-off-by: Fang, Yang A <yang.a.fang@intel.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
2015-04-27 15:43:43 +01:00
Vinod Koul 8c359a9f36 ASoC: intel - use SNDRV_CTL_ELEM_ID_NAME_MAXLEN
we have defined SNDRV_CTL_ELEM_ID_NAME_MAXLEN as size of name array so use
this define instead of numeric value

Signed-off-by: Vinod Koul <vinod.koul@intel.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
2015-04-27 15:43:43 +01:00
Jin Yao 3228723b0c ASoC: Intel: Remove invalid kfree of devm allocated data
kbuild robot reports following warning:
"sound/soc/intel/haswell/sst-haswell-ipc.c:2204:1-6:
 WARNING: invalid free of devm_ allocated data"

As julia explains to me, the memory allocated with devm_kalloc
is freed automatically on failure of a probe function. So this
kfree should be removed otherwise the double free will be got in
error handler path.

Signed-off-by: Jin Yao <yao.jin@linux.intel.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
2015-04-27 15:43:43 +01:00
Linus Torvalds b787f68c36 Linux 4.1-rc1 2015-04-26 17:59:10 -07:00
Andy Lutomirski 61f01dd941 x86_64, asm: Work around AMD SYSRET SS descriptor attribute issue
AMD CPUs don't reinitialize the SS descriptor on SYSRET, so SYSRET with
SS == 0 results in an invalid usermode state in which SS is apparently
equal to __USER_DS but causes #SS if used.

Work around the issue by setting SS to __KERNEL_DS __switch_to, thus
ensuring that SYSRET never happens with SS set to NULL.

This was exposed by a recent vDSO cleanup.

Fixes: e7d6eefaaa x86/vdso32/syscall.S: Do not load __USER32_DS to %ss
Signed-off-by: Andy Lutomirski <luto@kernel.org>
Cc: Peter Anvin <hpa@zytor.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Denys Vlasenko <vda.linux@googlemail.com>
Cc: Brian Gerst <brgerst@gmail.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2015-04-26 17:57:38 -07:00
Linus Torvalds 1190944f4b Merge branch 'drm-fixes' of git://people.freedesktop.org/~airlied/linux
Pull intel drm fixes from Dave Airlie.

* 'drm-fixes' of git://people.freedesktop.org/~airlied/linux:
  drm/i915: vlv: fix save/restore of GFX_MAX_REQ_COUNT reg
  drm/i915: Workaround to avoid lite restore with HEAD==TAIL
  drm/i915: cope with large i2c transfers
2015-04-26 17:55:26 -07:00
Linus Torvalds 9f86262dcc Merge git://git.infradead.org/intel-iommu
Pull intel iommu updates from David Woodhouse:
 "This lays a little of the groundwork for upcoming Shared Virtual
  Memory support — fixing some bogus #defines for capability bits and
  adding the new ones, and starting to use the new wider page tables
  where we can, in anticipation of actually filling in the new fields
  therein.

  It also allows graphics devices to be assigned to VM guests again.
  This got broken in 3.17 by disallowing assignment of RMRR-afflicted
  devices.  Like USB, we do understand why there's an RMRR for graphics
  devices — and unlike USB, it's actually sane.  So we can make an
  exception for graphics devices, just as we do USB controllers.

  Finally, tone down the warning about the X2APIC_OPT_OUT bit, due to
  persistent requests.  X2APIC_OPT_OUT was added to the spec as a nasty
  hack to allow broken BIOSes to forbid us from using X2APIC when they
  do stupid and invasive things and would break if we did.

  Someone noticed that since Windows doesn't have full IOMMU support for
  DMA protection, setting the X2APIC_OPT_OUT bit made Windows avoid
  initialising the IOMMU on the graphics unit altogether.

  This means that it would be available for use in "driver mode", where
  the IOMMU registers are made available through a BAR of the graphics
  device and the graphics driver can do SVM all for itself.

  So they started setting the X2APIC_OPT_OUT bit on *all* platforms with
  SVM capabilities.  And even the platforms which *might*, if the
  planets had been aligned correctly, possibly have had SVM capability
  but which in practice actually don't"

* git://git.infradead.org/intel-iommu:
  iommu/vt-d: support extended root and context entries
  iommu/vt-d: Add new extended capabilities from v2.3 VT-d specification
  iommu/vt-d: Allow RMRR on graphics devices too
  iommu/vt-d: Print x2apic opt out info instead of printing a warning
  iommu/vt-d: kill bogus ecap_niotlb_iunits()
2015-04-26 17:47:46 -07:00