- 03 Dec, 2012 4 commits
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Daniel Vetter authored
- __iomem where there is none (I love how we mix these things up). - Use gfp_t instead of an other plain type. - Unconfuse one place about enum pipe vs enum transcoder - for the pch transcoder we actually use the pipe enum. Fixup the other cases where we assign the pipe to the cpu transcoder with explicit casts. - Declare the mch_lock properly in a header. There is still a decent mess in intel_bios.c about __iomem, but heck, this is x86 and we're allowed to do that. Makes-sparse-happy: Chris Wilson <chris@chris-wilson.co.uk> [danvet: Use a space after the cast consistently and fix up the newly-added cast in i915_irq.c to properly use __iomem.] Signed-off-by:Daniel Vetter <daniel.vetter@ffwll.ch>
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Chris Wilson authored
Simply use the last write-domain set for the object in the batch, trusting userspace to have correctly flushed the caches between usage as a write target. This check dates back from the golden age of having only a single operation per batch with the kernel repeating it for each cliprect, and conflicts both with userspace trying to efficiently batch multiple operations and with reducing the kernel overhead of relocation processing. Signed-off-by:
Chris Wilson <chris@chris-wilson.co.uk> Signed-off-by:
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Chris Wilson authored
Be specific for the GPU domains so that we can detect if userspace ever passed in an invalid combination, as well as accurately reflect the known GPU domains when printing state. Fixes i-g-t/gem_exec_bad_domains References: https://bugs.freedesktop.org/show_bug.cgi?id=57826Signed-off-by:
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Damien Lespiau authored
Signed-off-by:
Damien Lespiau <damien.lespiau@intel.com> Signed-off-by:
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- 30 Nov, 2012 13 commits
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Chris Wilson authored
The primary purpose of this was to debug some use-after-free memory corruption that was causing an OOPS inside drm/i915. As it turned out the corruption was being caused elsewhere and i915.ko as a major user of many objects was being hit hardest. Indeed as we do frequent the generic kmalloc caches, dedicating one to ourselves (or at least naming one for us depending upon the core) aids debugging our own slab usage. Signed-off-by:
Jesse Barnes <jbarnes@virtuousgeek.org> Reviewed-by:
Ben Widawsky <ben@bwidawsk.net> Signed-off-by:
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Chris Wilson authored
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Chris Wilson authored
Signed-off-by:
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Chris Wilson authored
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Chris Wilson authored
Allow for the creation of GEM objects backed by stolen memory. As these are not backed by ordinary pages, we create a fake dma mapping and store the address in the scatterlist rather than obj->pages. v2: Mark _i915_gem_object_create_stolen() as static, as noticed by Jesse Barnes. Signed-off-by:
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Chris Wilson authored
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Chris Wilson authored
In order to accommodate objects that are not backed by struct pages, but instead point into a contiguous region of stolen space, we need to make various changes to avoid dereferencing obj->pages or obj->base.filp. First introduce a marker for the stolen object, that specifies its offset into the stolen region and implies that it has no backing pages. Signed-off-by:
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Chris Wilson authored
As FBC is commonly disabled due to limitations of the chipset upon output configurations, on many systems FBC is never enabled. For those systems, it is advantageous to make use of the stolen memory for other objects and so we defer allocation of the FBC chunk until we actually require it. This increases the likelihood of that allocation failing, but that in turns means that we are already taking advantage of the stolen memory! As well as delaying the allocation from driver initialisation until the first use of FBC, we also return the stolen block after we finish using it - allowing greater flexibility in our usage of stolen space. A side effect of this is that we can then attempt to allocate only the required amount of space (with a little slack to reduce reallocation rate and avoid fragmentation). Signed-off-by:
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Chris Wilson authored
As yet we do not do any preallocation (chicken-and-egg problem), but we may like to preserve anything already allocated by the BIOS or grub and reuse for own purposes after initialising the driver. Signed-off-by:
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Chris Wilson authored
The routine to query the base of stolen memory was using the wrong registers and the wrong encodings on virtually every platform. It was not until the G33 refresh, that a PCI config register was introduced that explicitly said where the stolen memory was. Prior to 865G there was not even a register that said where the end of usable low memory was and where the stolen memory began (or ended depending upon chipset). Before then, one has to look at the BIOS memory maps to find the Top of Memory. Alas that is not exported by arch/x86 and so we have to resort to disabling stolen memory on gen2 for the time being. Then SandyBridge enlarged the PCI register to a full 32-bits and change the encoding of the address, so even though we happened to be querying the right register, we read the wrong bits and ended up using address 0 for our stolen data, i.e. notably FBC. Signed-off-by:
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Chris Wilson authored
This will be used i915 in forthcoming patches in order to measure the largest contiguous chunk of memory available for enabling chipset features. v2: Try to make the macro marginally safer and more readable by not depending upon the drm_mm_hole_node_end() being non-zero. Note that we need to open code list_for_each() in order to update the hole_start, hole_end variable on each iteration and keep the macro sane. v3: Tidy up few BUG_ONs that fell foul of adding additional tests to drm_mm_hole_node_start(). Signed-off-by:
Dave Airlie <airlied@redhat.com> Cc: dri-devel@lists.freedesktop.org Reviewed-by:
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Chris Wilson authored
To be used later by i915 to preallocate exact blocks of space from the range manager. Signed-off-by:
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Daniel Vetter authored
We only need to read/write the south interrupt register if the corresponding bit is set in the north master interrupt register. Noticed while reading our interrupt handling code. Same optimization has already been applied on ivb in commit 0e43406b Author: Chris Wilson <chris@chris-wilson.co.uk> Date: Wed May 9 21:45:44 2012 +0100 drm/i915: Simplify interrupt processing for IvyBridge We can take advantage that the PCH_IIR is a subordinate register to reduce one of the required IIR reads, and that we only need to clear interrupts handled to reduce the writes. And by simply tidying the code we can reduce the line count and hopefully make it more readable. Reviewed-by:
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- 29 Nov, 2012 23 commits
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Luis R. Rodriguez authored
spinlock_t should always be used. LD drivers/gpu/drm/i915/built-in.o CHECK drivers/gpu/drm/i915/i915_drv.c CC [M] drivers/gpu/drm/i915/i915_drv.o CHECK drivers/gpu/drm/i915/i915_dma.c CC [M] drivers/gpu/drm/i915/i915_dma.o CHECK drivers/gpu/drm/i915/i915_irq.c CC [M] drivers/gpu/drm/i915/i915_irq.o CHECK drivers/gpu/drm/i915/i915_debugfs.c drivers/gpu/drm/i915/i915_debugfs.c:558:31: warning: dereference of noderef expression drivers/gpu/drm/i915/i915_debugfs.c:558:39: warning: dereference of noderef expression drivers/gpu/drm/i915/i915_debugfs.c:558:51: warning: dereference of noderef expression drivers/gpu/drm/i915/i915_debugfs.c:558:63: warning: dereference of noderef expression CC [M] drivers/gpu/drm/i915/i915_debugfs.o CHECK drivers/gpu/drm/i915/i915_suspend.c CC [M] drivers/gpu/drm/i915/i915_suspend.o CHECK drivers/gpu/drm/i915/i915_gem.c drivers/gpu/drm/i915/i915_gem.c:3703:14: warning: incorrect type in assignment (different base types) drivers/gpu/drm/i915/i915_gem.c:3703:14: expected unsigned int [unsigned] [usertype] mask drivers/gpu/drm/i915/i915_gem.c:3703:14: got restricted gfp_t drivers/gpu/drm/i915/i915_gem.c:3706:22: warning: invalid assignment: &= drivers/gpu/drm/i915/i915_gem.c:3706:22: left side has type unsigned int drivers/gpu/drm/i915/i915_gem.c:3706:22: right side has type restricted gfp_t drivers/gpu/drm/i915/i915_gem.c:3707:22: warning: invalid assignment: |= drivers/gpu/drm/i915/i915_gem.c:3707:22: left side has type unsigned int drivers/gpu/drm/i915/i915_gem.c:3707:22: right side has type restricted gfp_t drivers/gpu/drm/i915/i915_gem.c:3711:39: warning: incorrect type in argument 2 (different base types) drivers/gpu/drm/i915/i915_gem.c:3711:39: expected restricted gfp_t [usertype] mask drivers/gpu/drm/i915/i915_gem.c:3711:39: got unsigned int [unsigned] [usertype] mask CC [M] drivers/gpu/drm/i915/i915_gem.o CHECK drivers/gpu/drm/i915/i915_gem_context.c CC [M] drivers/gpu/drm/i915/i915_gem_context.o CHECK drivers/gpu/drm/i915/i915_gem_debug.c CC [M] drivers/gpu/drm/i915/i915_gem_debug.o CHECK drivers/gpu/drm/i915/i915_gem_evict.c CC [M] drivers/gpu/drm/i915/i915_gem_evict.o CHECK drivers/gpu/drm/i915/i915_gem_execbuffer.c CC [M] drivers/gpu/drm/i915/i915_gem_execbuffer.o CHECK drivers/gpu/drm/i915/i915_gem_gtt.c CC [M] drivers/gpu/drm/i915/i915_gem_gtt.o CHECK drivers/gpu/drm/i915/i915_gem_stolen.c CC [M] drivers/gpu/drm/i915/i915_gem_stolen.o CHECK drivers/gpu/drm/i915/i915_gem_tiling.c CC [M] drivers/gpu/drm/i915/i915_gem_tiling.o CHECK drivers/gpu/drm/i915/i915_sysfs.c CC [M] drivers/gpu/drm/i915/i915_sysfs.o CHECK drivers/gpu/drm/i915/i915_trace_points.c CC [M] drivers/gpu/drm/i915/i915_trace_points.o CHECK drivers/gpu/drm/i915/intel_display.c drivers/gpu/drm/i915/intel_display.c:1736:9: warning: mixing different enum types drivers/gpu/drm/i915/intel_display.c:1736:9: int enum transcoder versus drivers/gpu/drm/i915/intel_display.c:1736:9: int enum pipe drivers/gpu/drm/i915/intel_display.c:3659:48: warning: mixing different enum types drivers/gpu/drm/i915/intel_display.c:3659:48: int enum pipe versus drivers/gpu/drm/i915/intel_display.c:3659:48: int enum transcoder CC [M] drivers/gpu/drm/i915/intel_display.o CHECK drivers/gpu/drm/i915/intel_crt.c CC [M] drivers/gpu/drm/i915/intel_crt.o CHECK drivers/gpu/drm/i915/intel_lvds.c CC [M] drivers/gpu/drm/i915/intel_lvds.o CHECK drivers/gpu/drm/i915/intel_bios.c drivers/gpu/drm/i915/intel_bios.c:706:60: warning: incorrect type in initializer (different address spaces) drivers/gpu/drm/i915/intel_bios.c:706:60: expected struct vbt_header *vbt drivers/gpu/drm/i915/intel_bios.c:706:60: got void [noderef] <asn:2>*vbt drivers/gpu/drm/i915/intel_bios.c:726:42: warning: incorrect type in argument 1 (different address spaces) drivers/gpu/drm/i915/intel_bios.c:726:42: expected void const *<noident> drivers/gpu/drm/i915/intel_bios.c:726:42: got unsigned char [noderef] [usertype] <asn:2>* drivers/gpu/drm/i915/intel_bios.c:727:40: warning: cast removes address space of expression drivers/gpu/drm/i915/intel_bios.c:738:24: warning: cast removes address space of expression CC [M] drivers/gpu/drm/i915/intel_bios.o CHECK drivers/gpu/drm/i915/intel_ddi.c drivers/gpu/drm/i915/intel_ddi.c:87:6: warning: symbol 'intel_prepare_ddi_buffers' was not declared. Should it be static? drivers/gpu/drm/i915/intel_ddi.c:1036:34: warning: mixing different enum types drivers/gpu/drm/i915/intel_ddi.c:1036:34: int enum pipe versus drivers/gpu/drm/i915/intel_ddi.c:1036:34: int enum transcoder CC [M] drivers/gpu/drm/i915/intel_ddi.o drivers/gpu/drm/i915/intel_ddi.c: In function ‘intel_ddi_setup_hw_pll_state’: drivers/gpu/drm/i915/intel_ddi.c:1129:2: warning: ‘port’ may be used uninitialized in this function [-Wmaybe-uninitialized] drivers/gpu/drm/i915/intel_ddi.c:1111:12: note: ‘port’ was declared here CHECK drivers/gpu/drm/i915/intel_dp.c CC [M] drivers/gpu/drm/i915/intel_dp.o CHECK drivers/gpu/drm/i915/intel_hdmi.c CC [M] drivers/gpu/drm/i915/intel_hdmi.o CHECK drivers/gpu/drm/i915/intel_sdvo.c CC [M] drivers/gpu/drm/i915/intel_sdvo.o CHECK drivers/gpu/drm/i915/intel_modes.c CC [M] drivers/gpu/drm/i915/intel_modes.o CHECK drivers/gpu/drm/i915/intel_panel.c CC [M] drivers/gpu/drm/i915/intel_panel.o CHECK drivers/gpu/drm/i915/intel_pm.c drivers/gpu/drm/i915/intel_pm.c:2173:1: warning: symbol 'mchdev_lock' was not declared. Should it be static? CC [M] drivers/gpu/drm/i915/intel_pm.o CHECK drivers/gpu/drm/i915/intel_i2c.c CC [M] drivers/gpu/drm/i915/intel_i2c.o CHECK drivers/gpu/drm/i915/intel_fb.c CC [M] drivers/gpu/drm/i915/intel_fb.o CHECK drivers/gpu/drm/i915/intel_tv.c CC [M] drivers/gpu/drm/i915/intel_tv.o CHECK drivers/gpu/drm/i915/intel_dvo.c CC [M] drivers/gpu/drm/i915/intel_dvo.o CHECK drivers/gpu/drm/i915/intel_ringbuffer.c CC [M] drivers/gpu/drm/i915/intel_ringbuffer.o CHECK drivers/gpu/drm/i915/intel_overlay.c CC [M] drivers/gpu/drm/i915/intel_overlay.o CHECK drivers/gpu/drm/i915/intel_sprite.c CC [M] drivers/gpu/drm/i915/intel_sprite.o CHECK drivers/gpu/drm/i915/intel_opregion.c CC [M] drivers/gpu/drm/i915/intel_opregion.o CHECK drivers/gpu/drm/i915/dvo_ch7xxx.c CC [M] drivers/gpu/drm/i915/dvo_ch7xxx.o CHECK drivers/gpu/drm/i915/dvo_ch7017.c CC [M] drivers/gpu/drm/i915/dvo_ch7017.o CHECK drivers/gpu/drm/i915/dvo_ivch.c CC [M] drivers/gpu/drm/i915/dvo_ivch.o CHECK drivers/gpu/drm/i915/dvo_tfp410.c CC [M] drivers/gpu/drm/i915/dvo_tfp410.o CHECK drivers/gpu/drm/i915/dvo_sil164.c CC [M] drivers/gpu/drm/i915/dvo_sil164.o CHECK drivers/gpu/drm/i915/dvo_ns2501.c CC [M] drivers/gpu/drm/i915/dvo_ns2501.o CHECK drivers/gpu/drm/i915/i915_gem_dmabuf.c CC [M] drivers/gpu/drm/i915/i915_gem_dmabuf.o CHECK drivers/gpu/drm/i915/i915_ioc32.c CC [M] drivers/gpu/drm/i915/i915_ioc32.o CHECK drivers/gpu/drm/i915/intel_acpi.c CC [M] drivers/gpu/drm/i915/intel_acpi.o LD [M] drivers/gpu/drm/i915/i915.o Building modules, stage 2. MODPOST 1 modules CC drivers/gpu/drm/i915/i915.mod.o LD [M] drivers/gpu/drm/i915/i915.ko Cc: Daniel Vetter <daniel.vetter@ffwll.ch> Cc: intel-gfx@lists.freedesktop.org Cc: dri-devel@lists.freedesktop.org Reported-by:
Hauke Mehrtens <hauke@hauke-m.de> Signed-off-by:
Luis R. Rodriguez <mcgrof@do-not-panic.com> Signed-off-by:
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Paulo Zanoni authored
Use drm_dp_bw_code_to_link_rate insead. It's the same thing, but supports DP_LINK_BW_5_4 and is also used by the other drivers. Signed-off-by:
Paulo Zanoni <paulo.r.zanoni@intel.com> Signed-off-by:
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Paulo Zanoni authored
Do an early return in case we don't have DDI instead of having the whole function inside an "if" statement. Signed-off-by:
Imre Deak <imre.deak@intel.com> Signed-off-by:
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Paulo Zanoni authored
And use it whenever we call code that uses the DDIs. We already have intel_ddi.c and prefix every function with intel_ddi_something instead of haswell_something, so I think replacing the checks with HAS_DDI makes more sense. Just a cosmetical change, yes I know, but I have this OCD... Signed-off-by:
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Paulo Zanoni authored
This function is not called on Haswell anymore. Signed-off-by:
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Paulo Zanoni authored
It's not even declared on header files. Signed-off-by:
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Daniel Vetter authored
Since we drop dev->struct_mutex when going through the slowpath, the object might have been moved out of the cpu domain. Hence we need to clflush the entire object to ensure that after the ioctl returns, everything is coherent again (interwoven writes are ill-defined anyway). But we only need to do this if we start in the cpu domain and the object requires flushing for coherency. So don't do the flushing if the object is coherent anyway or if we've done in-line clfushing already. v2: i915_gem_clflush_object already checks whether the object is coherent and if so, drops the flushing. Hence we don't need to check that ourselves, simplifying the condition. v3: Reorder the checks for better clarity (and adjust the comment accordingly), suggested by Chris Wilson. Reviewed-by:
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Daniel Vetter authored
The shmem paths for pwrite/pread used a clever trick to hold onto a single page when dropping the big dev->struct_mutex for the slowpath. But this ran the risk of reinstating (or not completely purging) the backing storage when dropping purgeable objects. Hence the code needed to keep track of whether it ever dropped the lock, and if it did, manually check whether it needs to re-purge the backing storage. But thanks to the pages pin count introduced in commit a5570178 Author: Chris Wilson <chris@chris-wilson.co.uk> Date: Tue Sep 4 21:02:54 2012 +0100 drm/i915: Pin backing pages whilst exporting through a dmabuf vmap which allowed us to pin the backing storage and remove that page reference trick from shmem_pwrite/read in commit f60d7f0c Author: Chris Wilson <chris@chris-wilson.co.uk> Date: Tue Sep 4 21:02:56 2012 +0100 drm/i915: Pin backing pages for pread and commit 755d2218 Author: Chris Wilson <chris@chris-wilson.co.uk> Date: Tue Sep 4 21:02:55 2012 +0100 drm/i915: Pin backing pages for pwrite we can now abolish this check. The slowpath cleanup completely disappears from pread, and for pwrite we're only left with the domain fixup in case someone moved the object out of the cpu domain from under us. A follow-on patch will optimize that a notch more. Reviewed-by:
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Daniel Vetter authored
Only two things needed adjustment: - pipe select for PCH_CPT - There's no dithering bit on ilk+ in the lvds ctl reg Reviewed-by:
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Daniel Vetter authored
A few things needed to change: - HAS_PCH_SPLIT since ilk+ is not yet converted to this. - s/LVDS/intel_lvds->reg/ to prep for ilk conversion - replace the clock.p2 == 7 check with a is_dual_link check - s/adjusted_mode/intel_lvds->fixed_mode v2: Rebase on top of Jani Nikula's panel rework. I'm wondering whether we shouldn't add an attached_panel pointer to intel_encoder, to replace the encoder private ->attached_connector pointers, since that's essentially what we need. Reviewed-by:
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Daniel Vetter authored
To ditch at least some of the PCH_SPLIT ? PCH_LVDS : LVDS code ... v2: Rebase on top of Jani Nikula's panel rework. Reviewed-by:
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Daniel Vetter authored
Yeah, all users (both the clock selection special cases and the lvds pin pair stuff) are still in common code, but this will change. v2: Rebase on top of Jani Nikula's panel rework. v3: Incorporate review from Paulo Zanoni: - s/__is_dual_link_lvds/compute_is_dual_link_lvds - kill dev_priv->lvds_val - drop spurious whitespace change v4: Add a debug printk to display the dual-link status, as suggested by Paulo Zanoni in review. Reviewed-by: Paulo Zanoni <paulo.r.zanoni@intel.com> (v3) Signed-off-by: -
Daniel Vetter authored
Just a prep patch to make this a property of intel_lvds. Makes more sense, removes clutter from intel_display.c and eventually I want to move all the encoder special cases wrt clock handling to encoders anyway. v2: Add an intel_ prefixe to is_dual_link_lvds since it's non-static now. Reviewed-by:
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Daniel Vetter authored
... with is_dual_link_lvds introduced in commit b0354385 Author: Takashi Iwai <tiwai@suse.de> Date: Tue Mar 20 13:07:05 2012 +0100 drm/i915: Check VBIOS value for determining LVDS dual channel mode, too All these checks predate this commit and have simply been overlooked. Since we don't support switching between single-link and dual-link modes anyway, this different checks could at best only get in the way of refactorings, and in the worst case cause inconsistencies. v2: Update the comment, we now have a solid way to figure out whether we need dual-link lvds or not (falling back to vbt values as a last resort). We still don't know how to switch between dual-link and single link so leave that part intact. I'm not sure though whether switching between these two modes makes any sense - we always drive the panel at its fixed mode (with a fixed bpc) anyway ... Reviewed-by:
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Daniel Vetter authored
Currently we have two encoder specific bits in the common mode_set functions: - lvds pin pair enabling - dp m/n setting and computation Now the lvds stuff needs to happen before the pll is enabled. Since that is done in the crtc_mode_set functions, we need to add a new callback to be able to move them to the encoder code (where they belong). The dp m/n stuff is a giant mess anyway (since it also confuses itself with the fdi link m/n handling), so that needs to be handled separately. I think that we can move the pll enabling down quite a bit, which might allow us to eventually merge encoder->pre_enable with this new pre_pll_enable callback. But for now this will allow us to clean things up a bit. Note that vlv doesn't support lvds, hence we don't need to change anything in there. v2: Fixup commit message, both suggested from Paulo Zanoni. - dp m/n doesn't need to happen before pll enabling - lvds doesn't exist on vlv, hence no changes required in the vlv pll function. Reviewed-by:
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Chris Wilson authored
As we do not have any domains occupying the high bits, there is no point in always printing the leading 00. Signed-off-by:
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Ville Syrjälä authored
As per Chris Wilson's suggestion make i915_gem_execbuffer_wait_for_flips() go away. This was used to stall the GPU ring while there are pending page flips involving the relevant BO. Ie. while the BO is still being scanned out by the display controller. The recommended alternative is to use the page flip events to wait for the page flips to fully complete before reusing the BO of the old front buffer. Or use more buffers. Signed-off-by:
Ville Syrjälä <ville.syrjala@linux.intel.com> Reviewed-by:
Kristian Høgsberg <krh@bitplanet.net> Acked-by:
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Daniel Vetter authored
Somehow a chunk of unused register defines ended up in the middle of the PLL defines. They go back to the original kms merging. The only used #define is SR01, move it to the register name together with the other legacy vga stuff. Reviewed-by:
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Mika Kuoppala authored
i915_gem_handle_seqno_wrap() will zero all sync_seqnos but as the wrap can happen inside ring->sync_to(), pre wrap seqno was carried over and overwrote the zeroed sync_seqno. When wrap is handled, all outstanding requests will be retired and objects moved to inactive queue, causing their last_read_seqno to be zero. Use this to update the sync_seqno correctly. RING_SYNC registers after wrap will contain pre wrap values which are >= seqno. So injecting the semaphore wait into ring completes immediately. Original idea for using last_read_seqno from Chris Wilson. Signed-off-by:
Mika Kuoppala <mika.kuoppala@intel.com> Reviewed-by:
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Chris Wilson authored
Should be useful to know what the driver thought the other ring's seqno was when it last used a semaphore. Signed-off-by:
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Chris Wilson authored
Replace the wait for the ring to be clear with the more common wait for the ring to be idle. The principle advantage is one less exported intel_ring_wait function, and the removal of a hardcoded value. Signed-off-by:
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Chris Wilson authored
As we now always preallocate the seqno before writing to the ring, we can trivially test if we have any pending activity on the ring by inspecting the olr. This makes it then possible to flush operations that are not normally associated with a request, like power-management. Signed-off-by:
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Chris Wilson authored
Based on the work by Mika Kuoppala, we realised that we need to handle seqno wraparound prior to committing our changes to the ring. The most obvious point then is to grab the seqno inside intel_ring_begin(), and then to reuse that seqno for all ring operations until the next request. As intel_ring_begin() can fail, the callers must already be prepared to handle such failure and so we can safely add further checks. This patch looks like it should be split up into the interface changes and the tweaks to move seqno wrapping from the execbuffer into the core seqno increment. However, I found no easy way to break it into incremental steps without introducing further broken behaviour. v2: Mika found a silly mistake and a subtle error in the existing code; inside i915_gem_retire_requests() we were resetting the sync_seqno of the target ring based on the seqno from this ring - which are only related by the order of their allocation, not retirement. Hence we were applying the optimisation that the rings were synchronised too early, fortunately the only real casualty there is the handling of seqno wrapping. v3: Do not forget to reset the sync_seqno upon module reinitialisation, ala resume. Signed-off-by:
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