Commit Graph

1958 Commits

Author SHA1 Message Date
Daniel Vetter
398b7a1b88 Linux 3.6-rc7
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Merge tag 'v3.6-rc7' into drm-intel-next-queued

Manual backmerge of -rc7 to resolve a silent conflict leading to
compile failure in drivers/gpu/drm/i915/intel_hdmi.c.

This is due to the bugfix in -rc7:

commit b98b601672
Author: Wang Xingchao <xingchao.wang@intel.com>
Date:   Thu Sep 13 07:43:22 2012 +0800

    drm/i915: HDMI - Clear Audio Enable bit for Hot Plug

Since this code moved around a lot in -next git put that snippet at
the wrong spot. I've tried to fix this by making the conflict explicit
by merging a version for next with:

commit 3cce574f01
Author: Wang Xingchao <xingchao.wang@intel.com>
Date:   Thu Sep 13 11:19:00 2012 +0800

    drm/i915: HDMI - Clear Audio Enable bit for Hot Plug unconditionally

But that failed to solve the entire problem. To avoid pushing out
further -nightly branch to our QA where this is broken, do the
backmerge and manually add the stuff git adds to -next from the patch
in -fixes.

Note that this doesn't show up in git's merge diff (and hence is also
not handled by git rerere), which adds to the reasons why I'd like to
fix this with a verbose backmerge. The git merge diff only shows a
bunch of trivial conflicts of the "code changed in lines next to each
another" kind.

Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
2012-09-24 18:17:12 +02:00
Simon Kitching
16c58081eb drm/radeon: Prevent leak of scratch register on resume from suspend
Cards typically have 5-7 scratch registers; one of these is reserved for
rdev->rptr_save_reg. Unfortunately the reservation is done in function
r100_cp_init, which is called by all drivers except r600 - and this
function is also invoked on resume from suspend. After several resumes,
no scratch registers are free and graphics acceleration is disabled.

Dmesg then reports either:
   *ERROR* radeon: cp failed to get scratch reg (-22).
   *ERROR* radeon: cp isn't working(-22).
   radeon 0000:01:00.0: failed initializing CP (-22).
or:
   *ERROR* radeon: failed to get scratch reg (-22).
   *ERROR* radeon: failed testing IB on GFX ring (-22).
   *ERROR* ib ring test failed (-22).

The chain of calls on boot for all except r600 is:
radeon_init -> ... -> (rXXX_init) -> rXXX_startup -> r100_cp_init

The chain of calls on resume for all except r600 is:
rXXX_resume -> rXXX_startup -> r100_cp_init.

R600 correctly allocates rptr_save_reg in r600_init (ie once only, not
in resume). However moving the code into the init functions for all
drivers means touching 4 drivers. So instead, this patch just adds a
test in r100_cp_init to avoid reallocating on resume. As the rdev
structure is allocated via kzalloc in radeon_driver_load_kms, and zero
is not a valid registerid, zero safely implies not-yet-allocated.

This issue appears to have been introduced in c7eff978 (3.6.0-rcN)

Signed-off-by: Simon Kitching <skitching@vonos.net>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
2012-09-20 12:59:16 -04:00
Alex Deucher
2f1f4d9b60 Revert "drm/radeon: rework pll selection (v3)"
This reverts commit 985f61f7ee.

This commit fixed certain cases, but ended up regressing others
due to limitations in the current KMS API.  A proper fix is too
invasive for 3.6.  Push it back to 3.7.

Reported-by: Andres Freund <andres@anarazel.de>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
2012-09-17 17:26:24 -04:00
Christian König
f492c171a3 drm/radeon: make 64bit fences more robust v3
Only increase the higher 32bits if we really detect a wrap around.

v2: instead of increasing the higher 32bits just use the higher
    32bits from the last emitted fence.
v3: also use last emitted fence value as upper limit.

The intention of this patch is to make fences as robust as
they where before introducing 64bit fences. This is
necessary because on older systems it looks like the fence
value gets corrupted on initialization.

Fixes:
https://bugs.freedesktop.org/show_bug.cgi?id=51344

Should also fix:
https://bugs.freedesktop.org/show_bug.cgi?id=54129
https://bugs.freedesktop.org/show_bug.cgi?id=54662
https://bugzilla.redhat.com/show_bug.cgi?id=846505
https://bugzilla.redhat.com/show_bug.cgi?id=845639

3.5 needs a separate patch due to changes in the
fence code.  Will send that out separately.

Signed-off-by: Christian König <deathsimple@vodafone.de>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
2012-09-13 16:17:49 -04:00
Alex Deucher
985f61f7ee drm/radeon: rework pll selection (v3)
For DP we can use the same PPLL for all active DP
encoders.  Take advantage of that to prevent cases
where we may end up sharing a PPLL between DP and
non-DP which won't work.  Also clean up the code
a bit.

v2: - fix missing pll_id assignment in crtc init
v3: - fix DP PPLL check
    - document functions
    - break in main encoder search loop after matching.
      no need to keep checking additional encoders.

fixes:
https://bugs.freedesktop.org/show_bug.cgi?id=54471

Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org
2012-09-13 16:17:49 -04:00
Andy Shevchenko
9a6a4b4757 drm: use %*ph to dump small buffers
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
2012-09-13 11:28:30 +10:00
Alex Deucher
41fa543770 drm/radeon: fix dig encoder selection on DCE61
Was using the DCE41 code which was wrong. Fixes
blank displays on a number of Trinity systems.

Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org
2012-08-29 19:57:34 -04:00
Christian König
f54b350d89 drm/radeon: fix double free in radeon_gpu_reset
radeon_ring_restore is freeing the memory for the saved
ring data. We need to remember that, otherwise we try to
restore the ring data again on the next try. Additional
to that it shouldn't try the reset infinitely if we have
saved ring data.

Signed-off-by: Christian König <deathsimple@vodafone.de>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
2012-08-29 12:11:01 -04:00
Jerome Glisse
4a2b6662c3 drm/radeon: force dma32 to fix regression rs4xx,rs6xx,rs740
It seems some of those IGP dislike non dma32 page despite what
documentation says. Fix regression since we allowed non dma32
pages. It seems it only affect some revision of those IGP chips
as we don't know which one just force dma32 for all of them.

https://bugzilla.redhat.com/show_bug.cgi?id=785375

Signed-off-by: Jerome Glisse <jglisse@redhat.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
2012-08-29 12:11:01 -04:00
Alex Deucher
0ceb996c9e drm/radeon: rework panel mode setup
Adjust the panel mode setup to match the behavior
of the vbios.  Rather than checking for specific
bridge chip ids, just check the eDP configuration register.
This saves extra aux transactions and works across
DP bridge chips without requiring additional per chip
id checking.

Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
2012-08-29 12:11:01 -04:00
Alex Deucher
c205b232a6 drm/radeon/atom: powergating fixes for DCE6
Power gating is per crtc pair, but the powergating registers
should be called individually.  The hw handles power up/down
properly.  The pair is powered up if either crtc in the pair
is powered up and the pair is not powered down until both
crtcs in the pair are powered down.  This simplifies
programming and should save additional power as the previous
code never actually power gated the crtc pair.

Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org
2012-08-29 12:11:01 -04:00
Alex Deucher
8d1af57ae3 drm/radeon/atom: rework DIG modesetting on DCE3+
The ordering is important and the current drm code
wasn't cutting it for modern DIG encoders.  We need
to have information about crtc before setting up
the encoders so I've shifted the ordering a bit.
Probably we'll need a full rework akin to danvet's
recent intel patchs.  This patch fixes numerous
issues with DP bridge chips and makes link training
much more reliable.

Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org
2012-08-29 12:11:01 -04:00
Alex Deucher
4e58591c89 drm/radeon: don't disable plls that are in use by other crtcs
Some plls are shared for DP.

Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org
Reviewed-by: Michel Dänzer <michel.daenzer@amd.com>
2012-08-29 12:11:00 -04:00
Marek Olšák
523885dec1 drm/radeon: add proper checking of RESOLVE_BOX command for r600-r700
Checking of the second colorbuffer was skipped on r700, because
CB_TARGET_MASK was 0xf. With r600, CB_TARGET_MASK is changed to 0xff,
so we must set the number of samples of the second colorbuffer to 1 in order
to pass the CS checker.
The DRM version is bumped, because RESOLVE_BOX is always rejected without this
fix on r600.

Signed-off-by: Marek Olšák <maraeo@gmail.com>
Reviewed-by: Jerome Glisse <jglisse@redhat.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
2012-08-29 12:11:00 -04:00
Marek Olšák
3b5ef597ec drm/radeon: initialize tracked CS state
This should help catch uninitialized registers and reject commands
because of that.

Signed-off-by: Marek Olšák <maraeo@gmail.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
2012-08-29 12:11:00 -04:00
Marek Olšák
305a3d204a drm/radeon: fix reading CB_COLORn_MASK from the CS
Signed-off-by: Marek Olšák <maraeo@gmail.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
2012-08-29 12:11:00 -04:00
Alex Deucher
5317670692 drm/radeon/ss: use num_crtc rather than hardcoded 6
When checking if a pll is in use.

Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org
2012-08-21 18:52:56 -04:00
Alex Deucher
676bc2e1e4 Revert "drm/radeon: fix bo creation retry path"
This reverts commit d1c7871ddb.

ttm_bo_init() destroys the BO on failure. So this patch makes
the retry path work with freed memory.  This ends up causing
kernel panics when this path is hit.

Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org
2012-08-21 09:55:01 -04:00
Alex Deucher
c61e277587 drm/radeon: split ATRM support out from the ATPX handler (v3)
There are systems that use ATRM, but not ATPX.

Fixes:
https://bugs.freedesktop.org/show_bug.cgi?id=41265

V2: fix #ifdefs as per Greg's comments
V3: fix it harder

Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org
2012-08-20 11:13:05 -04:00
Alex Deucher
7c3906d04a drm/radeon: convert radeon vfct code to use acpi_get_table_with_size
Allows us to verify the table size.

Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org
2012-08-20 11:13:05 -04:00
David Lamparter
268ba0a99f drm/radeon: implement ACPI VFCT vbios fetch (v3)
This is required for pure UEFI systems.  The vbios is stored
in ACPI rather than at the legacy vga location.

Fixes:
https://bugs.freedesktop.org/show_bug.cgi?id=26891

V2: fix #ifdefs as per Greg's comments
V3: fix it harder

Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Reviewed-by: Jerome Glisse <jglisse@redhat.com>
Cc: stable@vger.kernel.org
2012-08-20 11:09:50 -04:00
Tvrtko Ursulin
52e9b39d9a drm/radeon/kms: extend the Fujitsu D3003-S2 board connector quirk to cover later silicon stepping
There is a more recent APU stepping with a new PCI ID
shipping in the same board by Fujitsu which needs the
same quirk to correctly mark the back plane connectors.

Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@onelan.co.uk>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org
2012-08-20 11:09:50 -04:00
Marek Olšák
fcdeefe4df drm/radeon: fix checking of MSAA renderbuffers on r600-r700
The MSAA checking was mostly unimplemented on r600-r700. The userspace
submits GPU commands and the kernel driver computes how much memory
the GPU will access and checks if it's all within buffer bounds the
userspace allocated. This patch fixes the computations of the size of
MSAA surfaces in memory.

Signed-off-by: Marek Olšák <maraeo@gmail.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
2012-08-20 11:09:49 -04:00
Marek Olšák
c116cc9496 drm/radeon: allow CMASK and FMASK in the CS checker on r600-r700
MSAA is impossible without them.

Signed-off-by: Marek Olšák <maraeo@gmail.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Reviewed-by: Jerome Glisse <jglisse@redhat.com>
2012-08-20 11:09:49 -04:00
Christian König
48c0ac9911 drm/radeon: init lockup timeout on ring init
Reset the lockup timeout on ring (re-)initialisation.

Otherwise we get error messages like this on gpu resets:
[ 1559.949177] radeon 0000:01:00.0: GPU lockup CP stall for more than 1482270msec

Signed-off-by: Christian König <deathsimple@vodafone.de>
cc: stable@vger.kernel.org
Reviewed-by: Michel Dänzer <michel.daenzer@amd.com>
2012-08-20 11:09:48 -04:00
Jerome Glisse
5efcc76c13 drm/radeon: avoid turning off spread spectrum for used pll
If spread spectrum is enabled and in use for a given pll we
should not turn it off as it will lead to turning off display
for crtc that use the pll (this behavior was observed on chelsea
edp).

Signed-off-by: Jerome Glisse <jglisse@redhat.com>
Cc: stable@vger.kernel.org
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
2012-08-20 11:09:48 -04:00
Dmitrii Cherkasov
f59abbf286 drm/radeon: fix typo in function header comment
Signed-off-by: Dmitrii Cherkasov <DCherkasov@luxsoft.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
2012-08-13 10:53:29 -04:00
Marek Olšák
6759a0a7a0 drm/radeon/kms: implement timestamp userspace query (v2)
Returns a snapshot of the GPU clock counter.  Needed
for certain OpenGL extensions.

v2: agd5f
- address Jerome's comments
- add function documentation

Signed-off-by: Marek Olšák <maraeo@gmail.com>
Reviewed-by: Jerome Glisse <jglisse@redhat.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
2012-08-13 10:50:56 -04:00
Marek Olšák
b51ad12a36 drm/radeon/kms: add MSAA texture support for r600-evergreen
Most of the checking seems to be in place already. As you can see,
log2(number of samples) resides in LAST_LEVEL.

This is required for MSAA support (namely for depth-stencil resolve and
blitting between MSAA resources).

Signed-off-by: Marek Olšák <maraeo@gmail.com>
Reviewed-by: Jerome Glisse <jglisse@redhat.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
2012-08-13 10:50:56 -04:00
Marek Olšák
f00245f182 drm/radeon/kms: reorder code in r600_check_texture_resource
Signed-off-by: Marek Olšák <maraeo@gmail.com>
Reviewed-by: Jerome Glisse <jglisse@redhat.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
2012-08-13 10:50:55 -04:00
Jerome Glisse
e43b5ec05a drm/radeon: fence virtual address and free it once idle v4
Virtual address need to be fenced to know when we can safely remove it.
This patch also properly clear the pagetable. Previously it was
serouisly broken.

Kernel 3.5/3.4 need a similar patch but adapted for difference in mutex locking.

v2: For to update pagetable when unbinding bo (don't bailout if
    bo_va->valid is true).
v3: Add kernel 3.5/3.4 comment.
v4: Fix compilation warnings.

Signed-off-by: Jerome Glisse <jglisse@redhat.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
2012-08-13 10:50:55 -04:00
Alex Deucher
69b62ad8a4 drm/radeon: fix some missing parens in asic macros
Better safe than sorry.

Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Reviewed-by: Jerome Glisse <jglisse@redhat.com>
2012-08-13 10:50:54 -04:00
Alex Deucher
ecd67955fd drm/radeon: fix ordering in pll picking on dce4+
No functional change, but re-order the cases so they
evaluate properly due to the way the DCE macros work.

Noticed by kallisti5 on IRC.

Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
2012-08-13 10:50:53 -04:00
Jerome Glisse
81ee8fb6b5 drm/radeon: do not reenable crtc after moving vram start address
It seems we can not update the crtc scanout address. After disabling
crtc, update to base address do not take effect after crtc being
reenable leading to at least frame being scanout from the old crtc
base address. Disabling crtc display request lead to same behavior.

So after changing the vram address if we don't keep crtc disabled
we will have the GPU trying to read some random system memory address
with some iommu this will broke the crtc engine and will lead to
broken display and iommu error message.

So to avoid this, disable crtc. For flicker less boot we will need
to avoid moving the vram start address.

This patch should also fix :

https://bugs.freedesktop.org/show_bug.cgi?id=42373

Cc: <stable@vger.kernel.org>
Signed-off-by: Jerome Glisse <jglisse@redhat.com>
2012-08-13 10:50:52 -04:00
Alex Deucher
5b23c9045a drm/radeon: fix bank tiling parameters on cayman
Handle the 16 bank case.

Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org
2012-08-13 10:50:52 -04:00
Alex Deucher
c8d15edc17 drm/radeon: fix bank tiling parameters on evergreen
Handle the 16 bank case.

Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org
2012-08-13 10:50:51 -04:00
Christian König
dca571a6a4 drm/radeon: fix bank tiling parameters on SI
The sixteen bank case wasn't handled here, leading to GPU
crashes because of userspace miscalculation.

Signed-off-by: Christian König <deathsimple@vodafone.de>
Cc: stable@vger.kernel.org
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
2012-08-13 10:50:50 -04:00
Alex Deucher
6c0ae2ab85 drm/radeon: properly handle crtc powergating
Need to make sure the crtc is gated on before modesetting.
Explicitly gate the crtc on in prepare() and set a flag
so that the dpms functions don't gate it off during
mode set.

Noticed by sylware on IRC.

Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org
2012-08-13 10:50:50 -04:00
Alex Deucher
3838f46e36 drm/radeon: properly handle SS overrides on TN (v2)
The IntegratedSystemInfo table changed versions
on TN.  Update the SS override lookup to handle it.

v2: fix copy-paste typo.

Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
2012-08-13 10:50:49 -04:00
Alex Deucher
f4254a2bb4 drm/radeon/dce4+: set a more reasonable cursor watermark
Set a more reasonable default cursor watermark. The
recommended default value is 4.  This should reduce
urgency requests to the MC form the display hw.

Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
2012-08-13 10:50:49 -04:00
Alex Deucher
3d61bd4213 drm/radeon: fix handling for ddc type 5 on combios
When ddc type is 5, need to look up the i2c channel
in the i2c table.

Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
2012-08-13 10:50:48 -04:00
Marek Olšák
0f457e488c drm/radeon/kms: allow "invalid" DB formats as a means to disable DB
Signed-off-by: Marek Olšák <maraeo@gmail.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org
Signed-off-by: Dave Airlie <airlied@redhat.com>
2012-08-09 09:53:13 +10:00
Jerome Glisse
fcedac670c drm/radeon: fix dpms on/off on trinity/aruba v2
The external encoder need to be setup again before enabling the
transmiter. This seems to be only needed on some trinity/aruba
to fix dpms on.

v2: Add comment, only setup again on dce6 ie aruba or newer.

Cc: <stable@kernel.org>
Signed-off-by: Jerome Glisse <jglisse@redhat.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
2012-07-25 14:16:28 +10:00
Jerome Glisse
ca2ccde5e2 drm/radeon: on hotplug force link training to happen (v2)
To have DP behave like VGA/DVI we need to retrain the link
on hotplug. For this to happen we need to force link
training to happen by setting connector dpms to off
before asking it turning it on again.

v2: agd5f
- drop the dp_get_link_status() change in atombios_dp.c
  for now.  We still need the dpms OFF change.

Signed-off-by: Jerome Glisse <jglisse@redhat.com>
Cc: stable@vger.kernel.org
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
2012-07-25 14:14:12 +10:00
Jerome Glisse
266dcba541 drm/radeon: fix hotplug of DP to DVI|HDMI passive adapters (v2)
No need to retrain the link for passive adapters.

v2: agd5f
- no passive DP to VGA adapters, update comments
- assign radeon_connector_atom_dig after we are sure
  we have a digital connector as analog connectors
  have different private data.
- get new sink type before checking for retrain.  No
  need to check if it's no longer a DP connection.

Cc: <stable@vger.kernel.org>
Signed-off-by: Jerome Glisse <jglisse@redhat.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
2012-07-25 14:14:07 +10:00
Jerome Glisse
8d1c702aa0 drm/radeon: fix non revealent error message
We want to print link status query failed only if it's
an unexepected fail. If we query to see if we need
link training it might be because there is nothing
connected and thus link status query have the right
to fail in that case.

To avoid printing failure when it's expected, move the
failure message to proper place.

Cc: stable@vger.kernel.org
Signed-off-by: Jerome Glisse <jglisse@redhat.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
2012-07-25 14:13:05 +10:00
Dan Carpenter
1e179d4e28 drm/radeon: check for allocation failure in radeon_ring_backup()
Static checkers complain if this we don't check for allocation failure.
Also we can use the new kmalloc_array() function here as a cleanup.

Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
2012-07-25 14:12:17 +10:00
Jerome Glisse
d1c7871ddb drm/radeon: fix bo creation retry path
Retry label was at wrong place in function leading to memory
leak.

Cc: <stable@vger.kernel.org>
Signed-off-by: Jerome Glisse <jglisse@redhat.com>
Reviewed-by: Michel Dänzer <michel.daenzer@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
2012-07-25 14:11:01 +10:00
Ilija Hadzic
949c4a34af drm: track dev_mapping in more robust and flexible way
Setting dev_mapping (pointer to the address_space structure
used for memory mappings) to the address_space of the first
opener's inode and then failing if other openers come in
through a different inode has a few restrictions that are
eliminated by this patch.

If we already have valid dev_mapping and we spot an opener
with different i_node, we force its i_mapping pointer to the
already established address_space structure (first opener's
inode). This will make all mappings from drm device hang off
the same address_space object.

Some benefits (things that now work and didn't work
before) of this patch are:

 * user space can mknod and use any number of device
   nodes and they will all work fine as long as the major
   device number is that of the drm module.
 * user space can even remove the first opener's device
   nodes and mknod the new one and the applications and
   windowing system will still work.
 * GPU drivers can safely assume that dev->dev_mapping is
   correct address_space and just blindly copy it
   into their (private) bdev.dev_mapping

For reference, some discussion that lead to this patch can
be found here:

http://lists.freedesktop.org/archives/dri-devel/2012-April/022283.html

Signed-off-by: Ilija Hadzic <ihadzic@research.bell-labs.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
2012-07-25 14:09:30 +10:00
Dave Airlie
e6b0b6a82f Linux 3.5-rc7
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Merge tag 'v3.5-rc7' into drm-next

Merge Linus tree into drm to fixup conflicts in radeon code for further
testing before upstream merge.

Signed-off-by: Dave Airlie <airlied@redhat.com>

Conflicts:
	drivers/gpu/drm/i915/i915_dma.c
	drivers/gpu/drm/i915/intel_display.c
	drivers/gpu/drm/radeon/radeon_gart.c
2012-07-20 00:53:28 -04:00