On 9/11/20 1:15 AM, Dmitry Osipenko wrote:
09.09.2020 11:10, Mikko Perttunen пишет:
On 9/9/20 2:45 AM, Dmitry Osipenko wrote:
05.09.2020 13:34, Mikko Perttunen пишет:
...
+/* Submission */
+
+/** Patch address of the specified mapping in the submitted gather. */
+#define DRM_TEGRA_SUBMIT_BUF_WRITE_RELOC (1<<0)
Shouldn't the kernel driver be aware about what relocations need to be
patched? Could you please explain the purpose of this flag?
Sure, the kernel knows if it returned the IOVA to the user or not, so we
could remove this flag and determine it implicitly. I don't think there
is much harm in it though; if we have the flag an application can decide
to ignore the iova field and just pass WRITE_RELOC always, and it's not
really any extra code on kernel side.
Sounds like there is no real practical use for this flag other than for
testing purposes, correct?
Patching depending just on if the MAP IOCTL returned an IOVA or not
seems a bit "spooky action at a distance"-ish to me, but maybe it's not
so bad.. I'll consider removing it.
Mikko
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