[PATCH] drm/i915/guc: Don't capture Gen8 regs on Gen12 devices

[Matt Roper]

On Wed, Apr 05, 2023 at 02:13:31PM -0700, John Harrison wrote:
> On 4/3/2023 17:34, Matt Roper wrote:
> > On Mon, Apr 03, 2023 at 02:33:34PM -0700, John.C.Harrison at Intel.com wrote:
> > > From: John Harrison <John.C.Harrison at Intel.com>
> > > 
> > > A pair of pre-Gen12 registers were being included in the Gen12 capture
> > > list. GuC was rejecting those as being invalid and logging errors
> > > about them. So, stop doing it.
> > Looks like these registers existed from gen8-gen11.  With this change,
> > it looks like they also won't be included in the GuC error capture for
> > gen11 (ICL and EHL/JSL) since those platforms return xe_lpd_lists [1]
> > rather than default_lists; do we care about that?  I assume not (since
> > those platforms don't use GuC submission unless you force it with the
> > enable_guc modparam and taint your kernel), but I figured I should point
> > it out.
> Yeah, I think the code is treating Gen11 as Gen12 rather than Gen9 or it's
> own thing. I hadn't spotted that before. It certainly seems incorrect.
> 
> > 
> > Reviewed-by: Matt Roper <matthew.d.roper at intel.com>
> > 
> > 
> > [1] Why is the main list we use called xe_lpd (i.e., the name of ADL-P's
> >      display IP)?  It doesn't seem like we're doing anything with display
> >      registers here so using display IP naming seems really confusing.
> I think because no-one has a clue what name refers to what hardware any more
> :(.
> 
> What are the official names for IP_VER 9, 11, 12.00, 12.50 and 12.55?

Yeah, the naming is a real mess.  :-(  For graphics IP, the official
terms are supposed to be:

12.00 = Xe_LP
12.10 = Xe_LP+ (basically the same as Xe_LP except for interrupts)
12.50 = Xe_HP
12.55 = Xe_HPG (it's nearly identical to Xe_HP)
12.7x = Xe_LPG

There are separate names for media, although we didn't really start
using them anywhere in the i915 until the separation of IPs started
becoming more important with MTL:

12.00 = Xe_M (or Xe_M+ for DG1, but we treat it the same in the KMD)
12.50 = Xe_XPM
12.55 = Xe_HPM
12.60 = Xe_XPM+
13.00 = Xe_LPM+

and display:

12.00 = Xe_D
13.00 = Xe_LPD (ADL-P) or Xe_HPD (DG2)
14.00 = Xe_LPD+


The pre-12 stuff predates the fancy new marketing-mandated names.  Even
though we're not using "gen" terminology going forward, those old ones
are grandfathered in, so it's still okay to refer to them as gen9,
gen11, etc.


Matt

> 
> John.
> 
> > 
> > 
> > Matt
> > 
> > > Signed-off-by: John Harrison <John.C.Harrison at Intel.com>
> > > Fixes: dce2bd542337 ("drm/i915/guc: Add Gen9 registers for GuC error state capture.")
> > > Cc: Alan Previn <alan.previn.teres.alexis at intel.com>
> > > Cc: Umesh Nerlige Ramappa <umesh.nerlige.ramappa at intel.com>
> > > Cc: Lucas De Marchi <lucas.demarchi at intel.com>
> > > Cc: John Harrison <John.C.Harrison at Intel.com>
> > > Cc: Jani Nikula <jani.nikula at intel.com>
> > > Cc: Matt Roper <matthew.d.roper at intel.com>
> > > Cc: Balasubramani Vivekanandan <balasubramani.vivekanandan at intel.com>
> > > Cc: Daniele Ceraolo Spurio <daniele.ceraolospurio at intel.com>
> > > ---
> > >   drivers/gpu/drm/i915/gt/uc/intel_guc_capture.c | 7 +++++--
> > >   1 file changed, 5 insertions(+), 2 deletions(-)
> > > 
> > > diff --git a/drivers/gpu/drm/i915/gt/uc/intel_guc_capture.c b/drivers/gpu/drm/i915/gt/uc/intel_guc_capture.c
> > > index cf49188db6a6e..e0e793167d61b 100644
> > > --- a/drivers/gpu/drm/i915/gt/uc/intel_guc_capture.c
> > > +++ b/drivers/gpu/drm/i915/gt/uc/intel_guc_capture.c
> > > @@ -31,12 +31,14 @@
> > >   	{ FORCEWAKE_MT,             0,      0, "FORCEWAKE" }
> > >   #define COMMON_GEN9BASE_GLOBAL \
> > > -	{ GEN8_FAULT_TLB_DATA0,     0,      0, "GEN8_FAULT_TLB_DATA0" }, \
> > > -	{ GEN8_FAULT_TLB_DATA1,     0,      0, "GEN8_FAULT_TLB_DATA1" }, \
> > >   	{ ERROR_GEN6,               0,      0, "ERROR_GEN6" }, \
> > >   	{ DONE_REG,                 0,      0, "DONE_REG" }, \
> > >   	{ HSW_GTT_CACHE_EN,         0,      0, "HSW_GTT_CACHE_EN" }
> > > +#define GEN9_GLOBAL \
> > > +	{ GEN8_FAULT_TLB_DATA0,     0,      0, "GEN8_FAULT_TLB_DATA0" }, \
> > > +	{ GEN8_FAULT_TLB_DATA1,     0,      0, "GEN8_FAULT_TLB_DATA1" }
> > > +
> > >   #define COMMON_GEN12BASE_GLOBAL \
> > >   	{ GEN12_FAULT_TLB_DATA0,    0,      0, "GEN12_FAULT_TLB_DATA0" }, \
> > >   	{ GEN12_FAULT_TLB_DATA1,    0,      0, "GEN12_FAULT_TLB_DATA1" }, \
> > > @@ -142,6 +144,7 @@ static const struct __guc_mmio_reg_descr xe_lpd_gsc_inst_regs[] = {
> > >   static const struct __guc_mmio_reg_descr default_global_regs[] = {
> > >   	COMMON_BASE_GLOBAL,
> > >   	COMMON_GEN9BASE_GLOBAL,
> > > +	GEN9_GLOBAL,
> > >   };
> > >   static const struct __guc_mmio_reg_descr default_rc_class_regs[] = {
> > > -- 
> > > 2.39.1
> > > 
> 

-- 
Matt Roper
Graphics Software Engineer
Linux GPU Platform Enablement
Intel Corporation