On Thu, 16 Mar 2023 22:14:52 -0700, Dixit, Ashutosh wrote: > > On Wed, 15 Mar 2023 18:01:01 -0700, Umesh Nerlige Ramappa wrote: > > > > Hi Umesh, > > Mostly looks good but one nit below. > > > OAM does not work with media C6 enabled on some steppings of MTL. > > Disable OAM if we detect that media C6 was enabled in bios. > > > > Signed-off-by: Umesh Nerlige Ramappa <umesh.nerlige.ramappa@xxxxxxxxx> > > --- > > drivers/gpu/drm/i915/i915_perf.c | 30 ++++++++++++++++++++++++++++++ > > 1 file changed, 30 insertions(+) > > > > diff --git a/drivers/gpu/drm/i915/i915_perf.c b/drivers/gpu/drm/i915/i915_perf.c > > index 77fae3d80128..4ac6535a0356 100644 > > --- a/drivers/gpu/drm/i915/i915_perf.c > > +++ b/drivers/gpu/drm/i915/i915_perf.c > > @@ -209,6 +209,7 @@ > > #include "gt/intel_gt_regs.h" > > #include "gt/intel_lrc.h" > > #include "gt/intel_lrc_reg.h" > > +#include "gt/intel_rc6.h" > > #include "gt/intel_ring.h" > > #include "gt/uc/intel_guc_slpc.h" > > > > @@ -4898,6 +4899,18 @@ static u32 num_perf_groups_per_gt(struct intel_gt *gt) > > > > static u32 __oam_engine_group(struct intel_engine_cs *engine) > > { > > + /* > > + * Wa_14017512683: mtl[a0..c0): Use of OAM must be preceded with Media > > + * C6 disable in BIOS. Do not enable OA for media classes if MC6 is > > + * enabled in BIOS. > > + */ > > + if (IS_MTL_MEDIA_STEP(engine->i915, STEP_A0, STEP_C0) && > > + intel_check_bios_c6_setup(&engine->gt->rc6)) { > > + drm_notice_once(&engine->i915->drm, > > + "OAM requires media C6 to be disabled in BIOS\n"); > > I think the typical mode of working with MTL would be to enable C6 unless OA > is needed. But this will print out this notice on every MTL system. So IMO > we should print this out only when a OAM perf stream is opened and that > fails. > > Though not sure if it's ok to add a line to an already cluttered dmesg? The > default console log level is 4 (WARNING) so maybe ok? > > https://linuxconfig.org/introduction-to-the-linux-kernel-log-levels > > Though if we fail the opening of an OAM stream we could make it a drm_warn? Another idea: there is a drm_notice in Patch 2 when C6 is disabled, maybe we could just change it to "C6 disabled by BIOS, OAM availbable\n" or something like that and just remove the notice from here. I think we should avoid the notice when C6 is enabled since that is likely to be the default mode. > > > + return PERF_GROUP_INVALID; > > + } > > + > > if (GRAPHICS_VER_FULL(engine->i915) >= IP_VER(12, 70)) { > > /* > > * There's 1 SAMEDIA gt and 1 OAM per SAMEDIA gt. All media slices > > @@ -5317,6 +5330,23 @@ int i915_perf_ioctl_version(struct drm_i915_private *i915) > > * > > * 7: Add support for video decode and enhancement classes. > > */ > > + > > + /* > > + * Wa_14017512683: mtl[a0..c0): Use of OAM must be preceded with Media > > + * C6 disable in BIOS. Do not enable OA for media classes if MC6 is > > + * enabled in BIOS. > > Maybe add something like "Return version 6 to indicate non-support for OAM." > just to make clear. > > > + */ > > + if (IS_MTL_MEDIA_STEP(i915, STEP_A0, STEP_C0)) { > > + struct intel_gt *gt; > > + int i; > > + > > + for_each_gt(gt, i915, i) { > > + if (gt->type == GT_MEDIA && > > + intel_check_bios_c6_setup(>->rc6)) > > + return 6; > > + } > > + } > > + > > return 7; > > } > > > > -- > > 2.36.1 > > > > Thanks. > -- > Ashutosh