Quoting Mika Kuoppala (2018-11-27 17:38:43)
> static void reset_csb_pointers(struct intel_engine_execlists *execlists)
> {
> + u32 reset_val;
> /*
> * After a reset, the HW starts writing into CSB entry [0]. We
> * therefore have to set our HEAD pointer back one entry so that
> @@ -776,8 +777,19 @@ static void reset_csb_pointers(struct
> intel_engine_execlists *execlists)
> * inline comparison of our cached head position against the last HW
> * write works even before the first interrupt.
> */
> - execlists->csb_head = execlists->csb_write_reset;
> - WRITE_ONCE(*execlists->csb_write, execlists->csb_write_reset);
> + execlists->csb_head = execlists->csb_entries - 1;
> +
> + if (execlists_mmio_mode(execlists)) {
> + const u32 mask = execlists->csb_entries == GEN8_CSB_ENTRIES ?
> + GEN8_CSB_WRITE_PTR_MASK :
> + GEN11_CSB_WRITE_PTR_MASK;
> +
> + reset_val = _MASKED_FIELD(mask, execlists->csb_head);
> + } else {
> + reset_val = execlists->csb_head;
> + }
Think: did I need to change this?
-Chris
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