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([fe80::9d4a:f89:f548:dbc7]) by IA0PR11MB7307.namprd11.prod.outlook.com ([fe80::9d4a:f89:f548:dbc7%6]) with mapi id 15.20.9632.017; Tue, 24 Feb 2026 08:54:52 +0000 Message-ID: Date: Tue, 24 Feb 2026 14:24:42 +0530 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v10 0/7] User readable error codes on atomic_ioctl failure To: =?UTF-8?B?VmlsbGUgU3lyasOkbMOk?= CC: Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Simona Vetter , Jani Nikula , Rodrigo Vivi , "Joonas Lahtinen" , Tvrtko Ursulin , , , , , , , , , , Suraj Kandpal References: <20260223-atomic-v10-0-f59c8def2e70@intel.com> <1a4462b8-def9-4474-8382-6e99b7c8276d@intel.com> <5f04b5f1-744e-449e-9a45-00fd477256fc@intel.com> Content-Language: en-US From: "Murthy, Arun R" In-Reply-To: Content-Type: text/plain; charset="UTF-8"; format=flowed Content-Transfer-Encoding: 8bit X-ClientProxiedBy: MA5P287CA0035.INDP287.PROD.OUTLOOK.COM (2603:1096:a01:17a::6) To IA0PR11MB7307.namprd11.prod.outlook.com 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Precedence: list List-Id: Intel Xe graphics driver List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: intel-xe-bounces@lists.freedesktop.org Sender: "Intel-xe" On 24-02-2026 14:16, Ville Syrjälä wrote: > On Tue, Feb 24, 2026 at 12:46:10PM +0530, Murthy, Arun R wrote: >> On 24-02-2026 12:37, Ville Syrjälä wrote: >>> On Mon, Feb 23, 2026 at 03:37:39PM +0530, Murthy, Arun R wrote: >>>> Any other comments/feedback on this? >>> Having random strings as uabi seems like a bad idea. >>> How would you make sure those are never changed? >> The requirement was to have a string for logging/debugging in the UMD >> logs and KMD/display to pass the verbose information. >> >> Discussions around this.[1][2] >> >> [1] https://hackmd.io/f3bDn3kyRUalLn4LbMfCVQ#Commit-Failure-Feedback >> >> [2] https://patchwork.freedesktop.org/patch/666193/?series=152276&rev=1 > So the enum+obj_id thing there is perhaps the only thing that makes > sense for compositors. > > Although I kinda doubt its actual usefulness to drive useful > fallback logic because often the restrictions might be a combination > of many things, and the kernel can only realistically report one of > those things. > > Anyways, someone really needs to do the actual compositor > implementation so that we could see how any of this would > even work in practice. Xaver is working on the compositor implementation for KWin and has commented[3] that the API looks good. [3] https://patchwork.freedesktop.org/patch/696982/?series=152275&rev=6 Thanks and Regards, Arun R Murthy ------------------- >> Thanks and Regards, >> Arun R Murthy >> ------------------- >> >>>> Thanks and Regards, >>>> Arun R Murthy >>>> ------------------- >>>> >>>> On 23-02-2026 14:45, Arun R Murthy wrote: >>>>> EDITME: Imported from f20260210-atomic-v9-5-525c88fd2402@intel.com >>>>> Please review before sending. >>>>> >>>>> The series focuses on providing a user readable error value on a failure >>>>> in drm_atomic_ioctl(). Usually -EINVAL is returned in most of the error >>>>> cases and it is difficult for the user to decode the error and get to >>>>> know the real cause for the error. If user gets to know the reason for >>>>> the error then corrective measurements can be taken up. >>>>> >>>>> User will have to check for the capability >>>>> DRM_CAP_ATOMIC_ERROR_REPORTING before using this feature so as to ensure >>>>> that the driver supports failure reporting. >>>>> >>>>> TODO: driver specific error codes are to be added and will be done in >>>>> the follow-up patches. >>>>> >>>>> TODO: Once the series is merged the element 'reserved' used for sending >>>>> the failure code in struct drm_mode_atomic is to changed to err_code. >>>>> >>>>> The IGT related changes are pushed for review @ >>>>> https://patchwork.freedesktop.org/series/153330/ >>>>> >>>>> [RFC] changes for libdrm pushed for review @ >>>>> https://gitlab.freedesktop.org/mesa/libdrm/-/merge_requests/450 >>>>> >>>>> To: Maarten Lankhorst >>>>> To: suraj.kandpal@intel.com> >>>>> To: Maxime Ripard >>>>> To: Thomas Zimmermann >>>>> To: David Airlie >>>>> To: Simona Vetter >>>>> To: Jani Nikula >>>>> To: Rodrigo Vivi >>>>> To: Joonas Lahtinen >>>>> To: Tvrtko Ursulin >>>>> To: xaver.hugl@kde.org >>>>> To: harry.wentland@amd.com >>>>> To: uma.shankar@intel.com >>>>> To: louis.chauvet@bootlin.com >>>>> To: naveen1.kumar@intel.com >>>>> To: ramya.krishna.yella@intel.com >>>>> Cc: dri-devel@lists.freedesktop.org >>>>> Cc: intel-gfx@lists.freedesktop.org >>>>> Cc: intel-xe@lists.freedesktop.org >>>>> Signed-off-by: Arun R Murthy >>>>> >>>>> Signed-off-by: Arun R Murthy >>>>> --- >>>>> Changes in v9: >>>>> - EDITME: describe what is new in this series revision. >>>>> - EDITME: use bulletpoints and terse descriptions. >>>>> - Link to v8: https://lore.kernel.org/r/20260129-atomic-v8-0-4cb7b0faa051@intel.com >>>>> >>>>> --- >>>>> Arun R Murthy (7): >>>>> drm: Define user readable error codes for atomic ioctl >>>>> drm/atomic: Add error_code element in atomic_state >>>>> drm/atomic: Call complete_signaling only if prepare_signaling is done >>>>> drm/atomic: Allocate atomic_state at the beginning of atomic_ioctl >>>>> drm/atomic: Return user readable error in atomic_ioctl >>>>> drm/i915/display: Error codes for async flip failures >>>>> drm: Introduce DRM_CAP_ATOMIC_ERROR_REPORTING >>>>> >>>>> drivers/gpu/drm/drm_atomic.c | 31 ++++++++++ >>>>> drivers/gpu/drm/drm_atomic_uapi.c | 89 ++++++++++++++++++++-------- >>>>> drivers/gpu/drm/drm_ioctl.c | 3 + >>>>> drivers/gpu/drm/i915/display/intel_display.c | 25 ++++---- >>>>> include/drm/drm_atomic.h | 10 ++++ >>>>> include/uapi/drm/drm.h | 7 +++ >>>>> include/uapi/drm/drm_mode.h | 37 ++++++++++++ >>>>> 7 files changed, 165 insertions(+), 37 deletions(-) >>>>> --- >>>>> base-commit: cec43d5c2696af219fc2ef71dd7e93db48c80f66 >>>>> change-id: 20250728-atomic-c9713fd357e4 >>>>> >>>>> Best regards,