On 20/04/17 04:33, Joonas Lahtinen wrote:
On ke, 2017-04-19 at 11:35 -0700, Michel Thierry wrote:
From: Arun Siluvery <arun.siluvery@xxxxxxxxxxxxxxx>
GuC expects a list of registers from the driver which are saved/restored
during engine reset. The type of value to be saved is controlled by
flags. We provide a minimal set of registers that we want GuC to save and
restore. This is not an issue in case of engine reset as driver initializes
most of them following an engine reset, but in case of media reset (aka
watchdog reset) which is completely internal to GuC (including resubmission
of hung workload), it is necessary to provide this list, otherwise GuC won't
be able to schedule further workloads after a reset. This is the minimal
set of registers identified for things to work as expected but if we see
any new issues, this register list can be expanded.
In order to not loose any existing workarounds, we have to let GuC know
the registers and its values. These will be reapplied after the reset.
Note that we can't just read the current value because most of these
registers are masked (so we have a workaround for a workaround for a
workaround).
v2: REGSET_MASKED is too difficult for GuC, use REGSET_SAVE_DEFAULT_VALUE
and current value from RING_MODE reg instead; no need to preserve
head/tail either, be extra paranoid and save whitelisted registers (Daniele).
v3: Workarounds added only once during _init_workarounds also have to
been restored, or we risk loosing them after internal GuC reset
(Daniele).
Cc: Daniele Ceraolo Spurio <daniele.ceraolospurio@xxxxxxxxx>
Signed-off-by: Arun Siluvery <arun.siluvery@xxxxxxxxxxxxxxx>
Signed-off-by: Jeff McGee <jeff.mcgee@xxxxxxxxx>
Signed-off-by: Michel Thierry <michel.thierry@xxxxxxxxx>
<SNIP>
@@ -732,15 +755,16 @@ static int gen9_init_workarounds(struct intel_engine_cs *engine)
int ret;
/* WaConextSwitchWithConcurrentTLBInvalidate:skl,bxt,kbl,glk */
- I915_WRITE(GEN9_CSFE_CHICKEN1_RCS, _MASKED_BIT_ENABLE(GEN9_PREEMPT_GPGPU_SYNC_SWITCH_DISABLE));
+ I915_GUC_REG_WRITE(GEN9_CSFE_CHICKEN1_RCS,
+ _MASKED_BIT_ENABLE(GEN9_PREEMPT_GPGPU_SYNC_SWITCH_DISABLE));
To make grepping easier, how about?
I915_WRITE(GUC_REG(GEN9_CSFE_CHICKEN1_RCS),
...);
Regards, Joonas
GUC_REG makes it sound like it is somehow related to GuC, while it
isn't, we just want GuC to restore its value. What about GUC_REG_RESTORE?
Thanks,
Daniele
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