drm/xe/oa: Enable Xe2+ PES disaggregation

Enable Xe2+ PES disaggregation (for OAG) to retrieve disaggregated metrics
when disaggregated data is needed. Userspace can select whether to receive
aggregated or disaggregated metrics via the particular OA configuration it
uses (programmed via DRM_XE_OBSERVATION_OP_ADD_CONFIG).

Bspec: 61101
Fixes: e936f885 ("drm/xe/oa/uapi: Expose OA stream fd")
Signed-off-by: Ashutosh Dixit <ashutosh.dixit@intel.com>
Reviewed-by: Lucas De Marchi <lucas.demarchi@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240909165933.2638765-1-ashutosh.dixit@intel.com
Cc: stable@vger.kernel.org

drivers/gpu/drm/xe/regs/xe_oa_regs.h

@@ -52,6 +52,7 @@
 #define  OAG_OABUFFER_MEMORY_SELECT		REG_BIT(0) /* 0: PPGTT, 1: GGTT */
 
 #define OAG_OACONTROL				XE_REG(0xdaf4)
+#define  OAG_OACONTROL_OA_PES_DISAG_EN		REG_GENMASK(27, 22)
 #define  OAG_OACONTROL_OA_CCS_SELECT_MASK	REG_GENMASK(18, 16)
 #define  OAG_OACONTROL_OA_COUNTER_SEL_MASK	REG_GENMASK(4, 2)
 #define  OAG_OACONTROL_OA_COUNTER_ENABLE	REG_BIT(0)

drivers/gpu/drm/xe/xe_oa.c

@@ -440,6 +440,10 @@ static void xe_oa_enable(struct xe_oa_stream *stream)
 	val = __format_to_oactrl(format, regs->oa_ctrl_counter_select_mask) |
 		__oa_ccs_select(stream) | OAG_OACONTROL_OA_COUNTER_ENABLE;
 
+	if (GRAPHICS_VER(stream->oa->xe) >= 20 &&
+	    stream->hwe->oa_unit->type == DRM_XE_OA_UNIT_TYPE_OAG)
+		val |= OAG_OACONTROL_OA_PES_DISAG_EN;
+
 	xe_mmio_write32(stream->gt, regs->oa_ctrl, val);
 }