On 10/12/14 10:40, Daniel Vetter wrote: > On Tue, Dec 09, 2014 at 12:59:06PM +0000, John.C.Harrison@xxxxxxxxx wrote: >> From: Dave Gordon <david.s.gordon@xxxxxxxxx> >> >> Added various definitions that will be useful for the scheduler in general and >> pre-emptive context switching in particular. >> >> Change-Id: Ica805b94160426def51f5d520f5ce51c60864a98 >> For: VIZ-1587 >> Signed-off-by: Dave Gordon <david.s.gordon@xxxxxxxxx> >> --- >> drivers/gpu/drm/i915/i915_reg.h | 30 ++++++++++++++++++++++- >> drivers/gpu/drm/i915/intel_ringbuffer.h | 40 +++++++++++++++++++++++++++++-- >> 2 files changed, 67 insertions(+), 3 deletions(-) [snip] >> +/* >> + * Tracking; these are updated by the GPU at the beginning and/or end of every >> + * batch. One pair for regular buffers, the other for preemptive ones. >> + */ >> +#define I915_BATCH_DONE_SEQNO 0x30 /* Completed batch seqno */ >> +#define I915_BATCH_ACTIVE_SEQNO 0x31 /* In progress batch seqno */ >> +#define I915_PREEMPTIVE_DONE_SEQNO 0x32 /* Completed preemptive batch */ >> +#define I915_PREEMPTIVE_ACTIVE_SEQNO 0x33 /* In progress preemptive batch */ > > This are software define and currently not yet used I think. Imo better to > add them together with the scheduler code that uses them. Splitting out > #define patches only makes sense if they can be reviewed separately (e.g. > registers with Bspec). Just adding software stuff (structs, enums, offsets > not enforced by hw) should be added with the actual code using it. OK >> + >> +/* >> + * Preemption; these are used by the GPU to save important registers >> + */ >> +#define I915_SAVE_PREEMPTED_RING_PTR 0x34 /* HEAD before preemption */ >> +#define I915_SAVE_PREEMPTED_BB_PTR 0x35 /* BB ptr before preemption */ >> +#define I915_SAVE_PREEMPTED_SBB_PTR 0x36 /* SBB before preemption */ >> +#define I915_SAVE_PREEMPTED_UHPTR 0x37 /* UHPTR after preemption */ >> +#define I915_SAVE_PREEMPTED_HEAD 0x38 /* HEAD after preemption */ >> +#define I915_SAVE_PREEMPTED_TAIL 0x39 /* TAIL after preemption */ >> +#define I915_SAVE_PREEMPTED_STATUS 0x3A /* RS preemption status */ >> +#define I915_SAVE_PREEMPTED_NOPID 0x3B /* Dummy */ > > I guess this is hardcoded in hw? In that case a HWS instead of I915 prefix > sounds better to me to make it clear this is not something i915/gem code > invented. Also comment should state whether this is execlist or gen8+ or > something like that. > -Daniel No, these are s/w too, so they can be added later if that's preferred. .Dave. _______________________________________________ Intel-gfx mailing list Intel-gfx@xxxxxxxxxxxxxxxxxxxxx http://lists.freedesktop.org/mailman/listinfo/intel-gfx
