mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-21 10:29:55 +07:00
84b790f80e
A context switch occurs by submitting a context descriptor to the ExecList Submission Port. Given that we can now initialize a context, it's possible to begin implementing the context switch by creating the descriptor and submitting it to ELSP (actually two, since the ELSP has two ports). The context object must be mapped in the GGTT, which means it must exist in the 0-4GB graphics VA range. Signed-off-by: Ben Widawsky <ben@bwidawsk.net> v2: This code has changed quite a lot in various rebases. Of particular importance is that now we use the globally unique Submission ID to send to the hardware. Also, context pages are now pinned unconditionally to GGTT, so there is no need to bind them. v3: Use LRCA[31:12] as hwCtxId[19:0]. This guarantees that the HW context ID we submit to the ELSP is globally unique and != 0 (Bspec requirements of the software use-only bits of the Context ID in the Context Descriptor Format) without the hassle of the previous submission Id construction. Also, re-add the ELSP porting read (it was dropped somewhere during the rebases). v4: - Squash with "drm/i915/bdw: Add forcewake lock around ELSP writes" (BSPEC says: "SW must set Force Wakeup bit to prevent GT from entering C6 while ELSP writes are in progress") as noted by Thomas Daniel (thomas.daniel@intel.com). - Rename functions and use an execlists/intel_execlists_ namespace. - The BUG_ON only checked that the LRCA was <32 bits, but it didn't make sure that it was properly aligned. Spotted by Alistair Mcaulay <alistair.mcaulay@intel.com>. v5: - Improved source code comments as suggested by Chris Wilson. - No need to abstract submit_ctx away, as pointed by Brad Volkin. Signed-off-by: Oscar Mateo <oscar.mateo@intel.com> Reviewed-by: Damien Lespiau <damien.lespiau@intel.com> [danvet: Checkpatch. Sigh.] Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch> |
||
|---|---|---|
| .. | ||
| drm | ||
| host1x | ||
| ipu-v3 | ||
| vga | ||
| Makefile | ||