On Wed, 26 May 2010 23:24:57 +0200 Maarten Maathuis <[email protected]> wrote:
> For NV04 i can understand, since it's irq driven fences, so let's > split the question. > > NV10+: can we reduce it to just spin_lock? I don't know the answer, but I know the theory: if there is any path, that can take the spinlock from an interrupt service path, then you must use the irq-safe version everywhere. > NV04: can't we rely on a normal spin lock and add it as well in > nv04_graph_mthd_set_ref? So if NV04 fences are driven by irqs, and the ISR needs to take the lock, then no, you cannot revert to irq-unsafe spinlocks. I'm not sure how it relates to ISR bottom halves, though. Note, that also irq-unsafe spinlocks disable preemption, which might be enough to disturb audio. my 2c -- Pekka Paalanen http://www.iki.fi/pq/ _______________________________________________ Nouveau mailing list [email protected] http://lists.freedesktop.org/mailman/listinfo/nouveau
