- 18 May, 2018 2 commits
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Jyri Sarha authored
Add device_link from panel device (supplier) to DRM device (consumer) when drm_panel_attach() is called. This patch should protect the master DRM driver if an attached panel driver unbinds while it is in use. The device_link should make sure the DRM device is unbound before the panel driver becomes unavailable. The device_link is removed when drm_panel_detach() is called. The drm_panel_detach() should be called by the consumer DRM driver, not the panel driver, otherwise both drivers are racing to delete the same link. Signed-off-by:
Jyri Sarha <jsarha@ti.com> Reviewed-by:
Eric Anholt <eric@anholt.net> Signed-off-by:
Thierry Reding <treding@nvidia.com> Link: https://patchwork.freedesktop.org/patch/msgid/b53584fd988d045c13de22d81825395b0ae0aad7.1524727888.git.jsarha@ti.com
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Jyri Sarha authored
Remove all drm_panel_detach() calls from all panel drivers and update the kerneldoc for drm_panel_detach(). Setting the connector and drm to NULL when the DRM panel device is going away hardly serves any purpose. Usually the whole memory structure is freed right after the remove call. However, calling the detach function from the master DRM device, and setting the connector pointer to NULL, has the logic of marking the panel again as available for another DRM master to attach. The usual situation would be the same DRM master device binding again. Signed-off-by:
Daniel Vetter <daniel.vetter@ffwll.ch> Signed-off-by:
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- 17 May, 2018 4 commits
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Stanislav Lisovskiy authored
Added encoding of drm content_type property from drm_connector_state within AVI infoframe in order to properly handle external HDMI TV content-type setting. This requires also manipulationg ITC bit, as stated in HDMI spec. v2: * Moved helper function which attaches content type property to the drm core, as was suggested. Removed redundant connector state initialization. v3: * Removed caps in drm_content_type_enum_list. After some discussion it turned out that HDMI Spec 1.4 was wrongly assuming that IT Content(itc) bit doesn't affect Content type states, however itc bit needs to be manupulated as well. In order to not expose additional property for itc, for sake of simplicity it was decided to bind those together in same "content type" property. v4: * Added it_content checking in intel_digital_connector_atomic_check. Fixed documentation for new content type enum. v5: * Moved patch revision's description to commit messages. v6: * Minor naming fix for the content type enumeration string. v7: * Fix parameter name for documentation and parameter alignment in order not to get warning. Added Content Type description to new HDMI connector properties section. v8: * Thrown away unneeded numbers from HDMI content-type property description. Switch to strings desription instead of plain definitions. v9: * Moved away hdmi specific content-type enum from drm_connector_state. Content type property should probably not be bound to any specific connector interface in drm_connector_state. Same probably should be done to hdmi_picture_aspect_ration enum which is also contained in drm_connector_state. Added special helper function to get derive hdmi specific relevant infoframe fields. v10: * Added usage description to HDMI properties kernel doc. v11: * Created centralized function for filling HDMI AVI infoframe, based on correspondent DRM property value. Acked-by:
Hans Verkuil <hans.verkuil@cisco.com> Acked-by:
Stanislav Lisovskiy <stanislav.lisovskiy@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20180515135928.31092-3-stanislav.lisovskiy@intel.com [vsyrjala: clean up checkpatch multiple blank lines warnings] Signed-off-by:
Ville Syrjälä <ville.syrjala@linux.intel.com>
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Stanislav Lisovskiy authored
Added content_type property to drm_connector_state in order to properly handle external HDMI TV content-type setting. v2: * Moved helper function which attaches content type property to the drm core, as was suggested. Removed redundant connector state initialization. v3: * Removed caps in drm_content_type_enum_list. After some discussion it turned out that HDMI Spec 1.4 was wrongly assuming that IT Content(itc) bit doesn't affect Content type states, however itc bit needs to be manupulated as well. In order to not expose additional property for itc, for sake of simplicity it was decided to bind those together in same "content type" property. v4: * Added it_content checking in intel_digital_connector_atomic_check. Fixed documentation for new content type enum. v5: * Moved patch revision's description to commit messages. v6: * Minor naming fix for the content type enumeration string. v7: * Fix parameter name for documentation and parameter alignment in order not to get warning. Added Content Type description to new HDMI connector properties section. v8: * Thrown away unneeded numbers from HDMI content-type property description. Switch to strings desription instead of plain definitions. v9: * Moved away hdmi specific content-type enum from drm_connector_state. Content type property should probably not be bound to any specific connector interface in drm_connector_state. Same probably should be done to hdmi_picture_aspect_ration enum which is also contained in drm_connector_state. Added special helper function to get derive hdmi specific relevant infoframe fields. v10: * Added usage description to HDMI properties kernel doc. v11: * Created centralized function for filling HDMI AVI infoframe, based on correspondent DRM property value. Acked-by:
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Philippe Cornu authored
Minor fixes detected with "scripts/checkpatch.pl --strict" Signed-off-by:
Philippe Cornu <philippe.cornu@st.com> Acked-by:
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Maxime Ripard authored
The vc4 HVS uses an internal RGB888 representation of the frames, and will by default expand formats using a lower depth using zeros. This causes an issue when we try to use other compositing software such as pixman that fill the missing bits by repeating the higher significant bits. As such, we can't check the display output in a reliable way by doing a software composition and an hardware one and compare both. To prevent this, force the same behaviour so that we can do such things. Signed-off-by:
Maxime Ripard <maxime.ripard@bootlin.com> Signed-off-by:
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- 15 May, 2018 2 commits
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Philippe Cornu authored
This patch clarifies the adjusted_mode documentation for bridges. Signed-off-by:
Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com> Reviewed-by:
Archit Taneja <architt@codeaurora.org> Link: https://patchwork.freedesktop.org/patch/msgid/20180409152427.12449-1-philippe.cornu@st.com
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Colin Ian King authored
Trivial fix to spelling mistake in DRM_INFO message. Signed-off-by:
Colin Ian King <colin.king@canonical.com> Reviewed-by:
Oleksandr Andrushchenko <oleksandr_andrushchenko@epam.com> Signed-off-by:
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- 14 May, 2018 3 commits
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Souptick Joarder authored
Use new return type vm_fault_t for fault handler. For now, this is just documenting that the function returns a VM_FAULT value rather than an errno. Once all instances are converted, vm_fault_t will become a distinct type. Reference id -> 1c8f4220 ("mm: change return type to vm_fault_t") Signed-off-by:
Souptick Joarder <jrdr.linux@gmail.com> Link: http://patchwork.freedesktop.org/patch/msgid/20180417133844.GA30256@jordon-HP-15-Notebook-PCSigned-off-by:
Gerd Hoffmann <kraxel@redhat.com>
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Dave Airlie authored
Although the kernel doesn't use this, qemu imports these headers and it's best to keep them consistent. This define is also something userspace may want to use. Signed-off-by:
Dave Airlie <airlied@redhat.com> Link: http://patchwork.freedesktop.org/patch/msgid/20180503021021.10694-1-airlied@gmail.comSigned-off-by:
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Eric Anholt authored
drm_minor_alloc() does multiplication on this enum, so the removal ended up moving render nodes down from 128 base to 64. This caused Mesa's surfaceless backend to be unable to open the render nodes, since it was still looking up at 128. v2: Add a comment warning the next person. Signed-off-by:
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- 11 May, 2018 11 commits
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Maarten Lankhorst authored
drm-misc-next is still based on v4.16-rc7, and was getting a bit stale. Signed-off-by:Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
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Shashank Sharma authored
HDMI 2.0/CEA-861-F introduces two new aspect ratios: - 64:27 - 256:135 This patch: - Adds new DRM flags for to represent these new aspect ratios. - Adds new cases to handle these aspect ratios while converting from user->kernel mode or vise versa. This patch was once reviewed and merged, and later reverted due to lack of DRM client protection, while adding aspect ratio bits in user modes. This is a re-spin of the series, with DRM client cap protection. The previous series can be found here: https://pw-emeril.freedesktop.org/series/10850/Signed-off-by:
Shashank Sharma <shashank.sharma@intel.com> Reviewed-by: Sean Paul <seanpaul@chromium.org> (V2) Reviewed-by: Jose Abreu <Jose.Abreu@synopsys.com> (V2) Cc: Ville Syrjala <ville.syrjala@linux.intel.com> Cc: Sean Paul <seanpaul@chromium.org> Cc: Jose Abreu <Jose.Abreu@synopsys.com> Cc: Ankit Nautiyal <ankit.k.nautiyal@intel.com> V3: rebase V4: rebase V5: corrected the macro name for an aspect ratio, in a switch case. V6: rebase V7: rebase V8: rebase V9: rebase V10: rebase V11: rebase V12: rebase V13: rebase V14: rebase Acked-by:
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Shashank Sharma authored
Current DRM layer functions don't parse aspect ratio information while converting a user mode->kernel mode or vice versa. This causes modeset to pick mode with wrong aspect ratio, eventually causing failures in HDMI compliance test cases, due to wrong VIC. This patch adds aspect ratio information in DRM's mode conversion and mode comparision functions, to make sure kernel picks mode with right aspect ratio (as per the VIC). Background: This patch was once reviewed and merged, and later reverted due to lack of DRM cap protection. This is a re-spin of this patch, this time with DRM cap protection, to avoid aspect ratio information, when the client doesn't request for it. Review link: https://pw-emeril.freedesktop.org/patch/104068/ Background discussion: https://patchwork.kernel.org/patch/9379057/Signed-off-by:
Lin, Jia <lin.a.jia@intel.com> Signed-off-by:
Akashdeep Sharma <akashdeep.sharma@intel.com> Reviewed-by: Jim Bride <jim.bride@linux.intel.com> (V2) Reviewed-by: Jose Abreu <Jose.Abreu@synopsys.com> (V4) Cc: Ville Syrjala <ville.syrjala@linux.intel.com> Cc: Jim Bride <jim.bride@linux.intel.com> Cc: Jose Abreu <Jose.Abreu@synopsys.com> Cc: Ankit Nautiyal <ankit.k.nautiyal@intel.com> V3: modified the aspect-ratio check in drm_mode_equal as per new flags provided by Ville. https://patchwork.freedesktop.org/patch/188043/ V4: rebase V5: rebase V6: As recommended by Ville, avoided matching of aspect-ratio in drm_fb_helper, while trying to find a common mode among connectors for the target clone mode. V7: rebase V8: rebase V9: rebase V10: rebase V11: rebase V12: rebase V13: rebase V14: rebase Acked-by:
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Ankit Nautiyal authored
We parse the EDID and add all the modes in the connector's modelist. This adds CEA modes with aspect ratio information too, regardless of whether user space requested this information or not. This patch: -prunes the modes with aspect-ratio information, from the drm_mode_get_connector modelist supplied to the user, if the user-space has not set the aspect ratio DRM client cap. However if such a mode is unique in the list, it is kept in the list, with aspect-ratio flags reset. -prepares a list of exposed modes, which is used to find unique modes if aspect-ratio is not allowed. -adds a new list_head 'exposed_head' in drm_mode_display, to traverse the list of exposed modes. Cc: Ville Syrjala <ville.syrjala@linux.intel.com> Cc: Shashank Sharma <shashank.sharma@intel.com> Cc: Jose Abreu <jose.abreu@synopsys.com> Signed-off-by:
Ankit Nautiyal <ankit.k.nautiyal@intel.com> V3: As suggested by Ville, modified the mechanism of pruning of modes with aspect-ratio, if the aspect-ratio is not supported. Instead of straight away pruning such a mode, the mode is retained with aspect ratio bits set to zero, provided it is unique. V4: rebase V5: Addressed review comments from Ville: -used a pointer to store last valid mode. -avoided, modifying of picture_aspect_ratio in kernel mode, instead only flags bits of user mode are reset (if aspect-ratio is not supported). V6: As suggested by Ville, corrected the mode pruning logic and elaborated the mode pruning logic and the assumptions taken. V7: rebase V8: rebase V9: rebase V10: rebase V11: Fixed the issue caused in kms_3d test, and enhanced the pruning logic to correctly identify and prune modes with aspect-ratio, if aspect-ratio cap is not set. V12: As suggested by Ville, added another list_head in drm_mode_display to traverse the list of exposed modes and avoided duplication of modes. V13: Minor modifications, as suggested by Ville. v14: As suggested by Daniel Vetter and Ville Syrjala, corrected the pruning logic to avoid any dependency in the order of mode with aspect-ratio. Reviewed-by:
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Ankit Nautiyal authored
If the user-space does not support aspect-ratio, and requests for a modeset with mode having aspect ratio bits set, then the given user-mode must be rejected. Secondly, while preparing a user-mode from kernel mode, the aspect-ratio info must not be given, if aspect-ratio is not supported by the user. This patch: 1. rejects the modes with aspect-ratio info, during modeset, if the user does not support aspect ratio. 2. does not load the aspect-ratio info in user-mode structure, if aspect ratio is not supported. 3. adds helper functions for determining if aspect-ratio is expected in user-mode and for allowing/disallowing the aspect-ratio, if its not expected. Signed-off-by:
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Ankit Nautiyal authored
To enable aspect-ratio support in DRM, blindly exposing the aspect ratio information along with mode, can break things in existing non-atomic user-spaces which have no intention or support to use this aspect ratio information. To avoid this, a new drm client cap is required to enable a non-atomic user-space to advertise if it supports modes with aspect-ratio. Based on this cap value, the kernel will take a call on exposing the aspect ratio info in modes or not. This patch adds the client cap for aspect-ratio. Since no atomic-userspaces blow up on receiving aspect-ratio information, the client cap for aspect-ratio is always enabled for atomic clients. Cc: Ville Syrjala <ville.syrjala@linux.intel.com> Cc: Shashank Sharma <shashank.sharma@intel.com> Signed-off-by:
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Ville Syrjälä authored
AVI infoframe can only carry none, 4:3, or 16:9 picture aspect ratios. Return an error if the user asked for something different. Cc: Shashank Sharma <shashank.sharma@intel.com> Cc: "Lin, Jia" <lin.a.jia@intel.com> Cc: Akashdeep Sharma <akashdeep.sharma@intel.com> Cc: Jim Bride <jim.bride@linux.intel.com> Cc: Jose Abreu <Jose.Abreu@synopsys.com> Cc: Daniel Vetter <daniel.vetter@ffwll.ch> Cc: Emil Velikov <emil.l.velikov@gmail.com> Cc: Thierry Reding <thierry.reding@gmail.com> Cc: Hans Verkuil <hans.verkuil@cisco.com> Cc: linux-media@vger.kernel.org Signed-off-by:
Jose Abreu <joabreu@synopsys.com> Signed-off-by:
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Ville Syrjälä authored
If the user mode would specify an aspect ratio other than 4:3 or 16:9 we now silently ignore it. Maybe a better apporoach is to return an error? Let's try that. Also we must be careful that we don't try to send illegal picture aspect in the infoframe as it's only capable of signalling none, 4:3, and 16:9. Currently we're sending these bogus infoframes whenever the cea mode specifies some other aspect ratio. Cc: Shashank Sharma <shashank.sharma@intel.com> Cc: Sean Paul <seanpaul@chromium.org> Cc: Jose Abreu <Jose.Abreu@synopsys.com> Cc: Daniel Vetter <daniel.vetter@ffwll.ch> Cc: Emil Velikov <emil.l.velikov@gmail.com> Signed-off-by:
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Ville Syrjälä authored
commit 6dffd431 ("drm: Add aspect ratio parsing in DRM layer") cause us to not send out any VICs in the AVI infoframes. That commit was since reverted, but if and when we add aspect ratio handing back we need to be more careful. Let's handle this by considering the aspect ratio as a requirement for cea mode matching only if the passed in mode actually has a non-zero aspect ratio field. This will keep userspace that doesn't provide an aspect ratio working as before by matching it to the first otherwise equal cea mode. And once userspace starts to provide the aspect ratio it will be considerd a hard requirement for the match. Also change the hdmi mode matching to use drm_mode_match() for consistency, but we don't match on aspect ratio there since the spec doesn't list a specific aspect ratio for those modes. Cc: Shashank Sharma <shashank.sharma@intel.com> Cc: "Lin, Jia" <lin.a.jia@intel.com> Cc: Akashdeep Sharma <akashdeep.sharma@intel.com> Cc: Jim Bride <jim.bride@linux.intel.com> Cc: Jose Abreu <Jose.Abreu@synopsys.com> Cc: Daniel Vetter <daniel.vetter@ffwll.ch> Cc: Emil Velikov <emil.l.velikov@gmail.com> Signed-off-by:
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Ville Syrjälä authored
Use drm_mode_equal_no_clocks_no_stereo() in drm_match_hdmi_mode_clock_tolerance() for consistency as we also use it in drm_match_hdmi_mode() and the cea mode matching functions. This doesn't actually change anything since the input mode comes from detailed timings and we match it against edid_4k_modes[] which. So none of those modes can have stereo flags set. Signed-off-by:
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Ville Syrjälä authored
Make mode matching less confusing by allowing the caller to specify which parts of the modes should match via some flags. Signed-off-by:
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- 10 May, 2018 1 commit
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Andy Shevchenko authored
The new helper returns index of the matching string in an array. We are going to use it here. Acked-by:
Hans de Goede <hdegoede@redhat.com> Signed-off-by:
Andy Shevchenko <andriy.shevchenko@linux.intel.com> Signed-off-by:
Sean Paul <seanpaul@chromium.org> Link: https://patchwork.freedesktop.org/patch/msgid/20180503184119.22355-1-andriy.shevchenko@linux.intel.com
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- 08 May, 2018 5 commits
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Matt Atwood authored
DP_TRAINING_AUX_RD_INTERVAL with DP 1.3 spec changed bit scheeme from 8 bits to 7 in DPCD 0x000e. The 8th bit is used to identify extended receiver capabilities. For panels that use this new feature wait interval would be increased by 512 ms, when spec is max 16 ms. This behavior is described in table 2-158 of DP 1.4 spec address 0000eh. With the introduction of DP 1.4 spec main link clock recovery was standardized to 100 us regardless of TRAINING_AUX_RD_INTERVAL value. To avoid breaking panels that are not spec compiant we now warn on invalid values. V2: commit title/message, masking all 7 bits, warn on out of spec values. V3: commit message, make link train clock recovery follow DP 1.4 spec. V4: style changes V5: typo V6: print statement revisions, DP_REV to DPCD_REV, comment correction V7: typo V8: Style V9: Strip out DPCD_REV_XX into seperate patch v10: DPCD_REV_XX to DP_DPCD_REV_XX Signed-off-by:
Matt Atwood <matthew.s.atwood@intel.com> Reviewed-by:
Rodrigo Vivi <rodrigo.vivi@intel.com> Signed-off-by:
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Matt Atwood authored
As more differentation occurs between DP spec. Its useful to have these as macros in a drm_dp_helper. v2: DPCD_REV_XX to DP_DPCD_REV_XX Signed-off-by:
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Dan Carpenter authored
If the loop times out then we want to exit with "to" set to zero, but in the current code it's set to -1. Fixes: c575b7ee ("drm/xen-front: Add support for Xen PV display frontend") Signed-off-by:
Dan Carpenter <dan.carpenter@oracle.com> Reviewed-by:
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Dan Carpenter authored
The xen_drm_front_shbuf_alloc() function was returning a mix of error pointers and NULL and the the caller wasn't checking correctly. I've changed it to always return error pointer consistently. Fixes: c575b7ee ("drm/xen-front: Add support for Xen PV display frontend") Signed-off-by:
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Dan Carpenter authored
drm_dev_alloc() returns error pointers, it never returns NULL. Fixes: c575b7ee ("drm/xen-front: Add support for Xen PV display frontend") Signed-off-by:
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- 07 May, 2018 1 commit
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Ezequiel Garcia authored
The sync_debug.h header is internal, and only used by sw_sync.c. Therefore, SW_SYNC is always defined and there is no need for the stubs. Remove them and make the code simpler. Signed-off-by:
Ezequiel Garcia <ezequiel@collabora.com> Signed-off-by:
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- 04 May, 2018 8 commits
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Maarten Lankhorst authored
Signed-off-by:
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Maarten Lankhorst authored
We want to add more DRM selftests, and there's not much point in having a Kconfig option for every single one of them, so make a generic one. Signed-off-by:
Chris Wilson <chris@chris-wilson.co.uk> Acked-by:
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Maarten Lankhorst authored
With the previous patch drm_atomic_helper_check_plane_state correctly calculates clipping and the xf86-video-intel ddx is fixed to fall back to GPU correctly when SetPlane fails, we can remove the hack where we try to pan/zoom when out of min/max scaling range. This was already poor behavior where the screen didn't show what was requested, and now instead we reject it outright. This simplifies check_sprite_plane a lot. Changes since v1: - Set crtc_h to the height correctly. - Reject < 3x3 rectangles instead of making them invisible for <gen9. For gen9+ skl_update_scaler_plane will reject them. Signed-off-by:
Jani Nikula <jani.nikula@intel.com>
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Maarten Lankhorst authored
Instead of relying on a scale which may increase rounding errors, clip src by doing: src * (dst - clip) / dst and rounding the result away from 1, so the new coordinates get closer to 1. We won't need to fix up with a magic macro afterwards, because our scaling factor will never go to the other side of 1. Changes since v1: - Adjust dst immediately, else drm_rect_width/height on dst gives bogus results. Change since v2: - Get rid of macros and use 64-bits math. Signed-off-by:
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Maarten Lankhorst authored
When calculating limits we want to be as pessimistic as possible, so we have to explicitly say whether we want to round up or down to accurately calculate whether we are below min_scale or above max_scale. Signed-off-by:
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Jia-Ju Bai authored
adv7511_probe() is never called in atomic context. This function is only set as ".probe" in struct i2c_driver. Despite never getting called from atomic context, adv7511_probe() calls mdelay() to busily wait. This is not necessary and can be replaced with usleep_range() to avoid busy waiting. This is found by a static analysis tool named DCNS written by myself. And I also manually check it. Signed-off-by:
Jia-Ju Bai <baijiaju1990@gmail.com> Reviewed-by:
Laurent Pinchart <laurent.pinchart@ideasonboard.com> Signed-off-by:
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Peter Rosin authored
Could perhaps prevent some confusion. Signed-off-by:
Peter Rosin <peda@axentia.se> Reviewed-by:
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git://anongit.freedesktop.org/drm/drm-intelDave Airlie authored
First drm/i915 feature batch heading for v4.18: - drm-next backmerge to fix build (Rodrigo) - GPU documentation improvements (Kevin) - GuC and HuC refactoring, host/GuC communication, logging, fixes, and more (mostly Michal and Michał, also Jackie, Michel and Piotr) - PSR and PSR2 enabling and fixes (DK, José, Rodrigo and Chris) - Selftest updates (Chris, Daniele) - DPLL management refactoring (Lucas) - DP MST fixes (Lyude and DK) - Watermark refactoring and changes to support NV12 (Mahesh) - NV12 prep work (Chandra) - Icelake Combo PHY enablers (Manasi) - Perf OA refactoring and ICL enabling (Lionel) - ICL enabling (Oscar, Paulo, Nabendu, Mika, Kelvin, Michel) - Workarounds refactoring (Oscar) - HDCP fixes and improvements (Ramalingam, Radhakrishna) - Power management fixes (Imre) - Various display fixes (Maarten, Ville, Vidya, Jani, Gaurav) - debugfs for FIFO underrun clearing (Maarten) - Execlist improvements (Chris) - Reset improvements (Chris) - Plenty of things here and there I overlooked and/or didn't understand... (Everyone) Signed-off-by:
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- 03 May, 2018 3 commits
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Eric Anholt authored
This driver will be used to support Mesa on the Broadcom 7268 and 7278 platforms. V3D 3.3 introduces an MMU, which means we no longer need CMA or vc4's complicated CL/shader validation scheme. This massively changes the GEM behavior, so I've forked off to a new driver. v2: Mark SUBMIT_CL as needing DRM_AUTH. coccinelle fixes from kbuild test robot. Drop personal git link from MAINTAINERS. Don't double-map dma-buf imported BOs. Add kerneldoc about needing MMU eviction. Drop prime vmap/unmap stubs. Delay mmap offset setup to mmap time. Use drm_dev_init instead of _alloc. Use ktime_get() for wait_bo timeouts. Drop drm_can_sleep() usage, since we don't modeset. Switch page tables back to WC (debug change to coherent had slipped in). Switch drm_gem_object_unreference_unlocked() to drm_gem_object_put_unlocked(). Simplify overflow mem handling by not sharing overflow mem between jobs. v3: no changes v4: align submit_cl to 64 bits (review by airlied), check zero flags in other ioctls. Signed-off-by: -
Eric Anholt authored
These OpenGL ES GPUs are present in the 7268 and 7278 set top box chips. v2: no changes v3: move to gpu/, fix typo Signed-off-by:
Rob Herring <robh@kernel.org>
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Eric Anholt authored
I had originally asked Stefan Schake to drop the pad field from the syncobj changes that just landed, because I couldn't come up with a reason to align to 64 bits. Talking with Dave Airlie about the new v3d driver's submit ioctl, we came up with a reason: sizeof() on 64-bit platforms may align to 64 bits, in which case the userspace will be submitting the aligned size and the final 32 bits won't be zero-padded by the kernel. If userspace doesn't zero-fill, then a future ABI change adding a 32-bit field at the end could potentially cause the kernel to read undefined data from old userspace (our userspace happens to use structure initialization that zero-fills, but as a general rule we try not to rely on that in the kernel). Signed-off-by:
Stefan Schake <stschake@gmail.com>
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