drm/xe/oa/uapi: Add/remove OA config perf ops

Introduce add/remove config perf ops for OA. OA configurations consist of a
set of event/counter select register address/value pairs. The add_config
perf op validates and stores such configurations and also exposes them in
the metrics sysfs. These configurations will be programmed to OA unit HW
when an OA stream using a configuration is opened. The OA stream can also
switch to other stored configurations.

v2: Start config id's from 1 and other minor review comments (Umesh)
v3: Add 32 bit build
v4: Add kernel doc for non-static functions (Michal)

Acked-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Acked-by: José Roberto de Souza <jose.souza@intel.com>
Reviewed-by: Umesh Nerlige Ramappa <umesh.nerlige.ramappa@intel.com>
Signed-off-by: Ashutosh Dixit <ashutosh.dixit@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240618014609.3233427-6-ashutosh.dixit@intel.com

include/uapi/drm/xe_drm.h

@@ -1378,6 +1378,7 @@ struct drm_xe_wait_user_fence {
  * enum drm_xe_perf_type - Perf stream types
  */
 enum drm_xe_perf_type {
+	DRM_XE_PERF_TYPE_OA,
 	__DRM_XE_PERF_TYPE_MAX, /* non-ABI */
 };
 
@@ -1469,6 +1470,30 @@ enum drm_xe_oa_format_type {
 	DRM_XE_OA_FMT_TYPE_PEC,
 };
 
+/**
+ * struct drm_xe_oa_config - OA metric configuration
+ *
+ * Multiple OA configs can be added using @DRM_XE_PERF_OP_ADD_CONFIG. A
+ * particular config can be specified when opening an OA stream using
+ * @DRM_XE_OA_PROPERTY_OA_METRIC_SET property.
+ */
+struct drm_xe_oa_config {
+	/** @extensions: Pointer to the first extension struct, if any */
+	__u64 extensions;
+
+	/** @uuid: String formatted like "%\08x-%\04x-%\04x-%\04x-%\012x" */
+	char uuid[36];
+
+	/** @n_regs: Number of regs in @regs_ptr */
+	__u32 n_regs;
+
+	/**
+	 * @regs_ptr: Pointer to (register address, value) pairs for OA config
+	 * registers. Expected length of buffer is: (2 * sizeof(u32) * @n_regs).
+	 */
+	__u64 regs_ptr;
+};
+
 #if defined(__cplusplus)
 }
 #endif