RESOLVED FIXED 236607
[GTK][WPE] Use drm render nodes in GbmDevice and make the fd global to the process 
https://bugs.webkit.org/show_bug.cgi?id=236607
Summary [GTK][WPE] Use drm render nodes in GbmDevice and make the fd global to the pr...
Alejandro G. Castro
Reported 2022-02-14 13:14:42 PST
We just need to use render nodes from the library, we do not need the other apis of the primary device file.
Attachments
Patch (3.36 KB, patch)
2022-02-14 13:22 PST, Alejandro G. Castro 		no flags
DetailsFormatted DiffDiff
Patch (3.63 KB, patch)
2022-02-15 11:21 PST, Alejandro G. Castro 		no flags
DetailsFormatted DiffDiff
Show Obsolete (1) View All Add attachment proposed patch, testcase, etc.
Alejandro G. Castro
Comment 1 2022-02-14 13:22:02 PST
Created attachment 451937 [details] Patch
Zan Dobersek
Comment 2 2022-02-14 23:23:38 PST
Comment on attachment 451937 [details] Patch View in context: https://bugs.webkit.org/attachment.cgi?id=451937&action=review > Source/WebCore/platform/graphics/gbm/GBMDevice.cpp:61 > + if (globalFd == -1) > + getDeviceFd(); This is now open to cross-thread race conditions. > Source/WebCore/platform/graphics/gbm/GBMDevice.cpp:75 > -int GBMDevice::getDeviceFd() > +void GBMDevice::getDeviceFd() This should be moved out into a standalone static function that internally uses std::call_once() to protect against separate threads racing to open the render node.
Zan Dobersek
Comment 3 2022-02-14 23:32:49 PST
Comment on attachment 451937 [details] Patch View in context: https://bugs.webkit.org/attachment.cgi?id=451937&action=review > Source/WebCore/platform/graphics/gbm/GBMDevice.cpp:81 > if (numDevices <=0) Poor spacing. > Source/WebCore/platform/graphics/gbm/GBMDevice.cpp:89 > + globalFd = open(device->nodes[DRM_NODE_RENDER], O_RDWR); O_CLOEXEC should also be used.
Alejandro G. Castro
Comment 4 2022-02-15 00:31:56 PST
(In reply to Zan Dobersek from comment #2) > Comment on attachment 451937 [details] > Patch > > View in context: > https://bugs.webkit.org/attachment.cgi?id=451937&action=review > > > Source/WebCore/platform/graphics/gbm/GBMDevice.cpp:61 > > + if (globalFd == -1) > > + getDeviceFd(); > > This is now open to cross-thread race conditions. > Good point, we need to protect the first access. > > Source/WebCore/platform/graphics/gbm/GBMDevice.cpp:75 > > -int GBMDevice::getDeviceFd() > > +void GBMDevice::getDeviceFd() > > This should be moved out into a standalone static function that internally > uses std::call_once() to protect against separate threads racing to open the > render node. Thanks for the comments! I'll update the patch.
Alejandro G. Castro
Comment 5 2022-02-15 11:21:49 PST
Created attachment 452063 [details] Patch
Zan Dobersek (Reviews)
Comment 6 2022-02-15 21:57:55 PST
Comment on attachment 452063 [details] Patch Great, thanks.
EWS
Comment 7 2022-02-16 02:57:13 PST
Committed r289885 (247323@main): <https://commits.webkit.org/247323@main> All reviewed patches have been landed. Closing bug and clearing flags on attachment 452063 [details].
Radar WebKit Bug Importer
Comment 8 2022-02-16 02:58:15 PST
<rdar://problem/89016322>
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