drm/xe/vf: Add support for VF to query its configuration

The VF driver doesn't know which GuC firmware was loaded by the PF
driver and must perform GuC ABI version handshake prior to sending
any other H2G actions to the GuC to submit workloads.

The VF driver also doesn't have access to the fuse registers and
must rely on the runtime info, which includes values of the fuse
registers, that the PF driver is exposing to the VFs.

Add functions to cover that functionality. We will use these
functions in upcoming patches.
Signed-off-by: Michal Wajdeczko <michal.wajdeczko@intel.com>
Cc: Piotr Piórkowski <piotr.piorkowski@intel.com>
Reviewed-by: Piotr Piórkowski <piotr.piorkowski@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240516110546.2216-5-michal.wajdeczko@intel.com

drivers/gpu/drm/xe/Makefile

@@ -155,6 +155,7 @@ xe-$(CONFIG_HWMON) += xe_hwmon.o
 
 # graphics virtualization (SR-IOV) support
 xe-y += \
+	xe_gt_sriov_vf.o \
 	xe_guc_relay.o \
 	xe_memirq.o \
 	xe_sriov.o

drivers/gpu/drm/xe/xe_gt_sriov_vf.h

+/* SPDX-License-Identifier: MIT */
+/*
+ * Copyright © 2023-2024 Intel Corporation
+ */
+
+#ifndef _XE_GT_SRIOV_VF_H_
+#define _XE_GT_SRIOV_VF_H_
+
+#include <linux/types.h>
+
+struct drm_printer;
+struct xe_gt;
+
+int xe_gt_sriov_vf_bootstrap(struct xe_gt *gt);
+int xe_gt_sriov_vf_query_config(struct xe_gt *gt);
+int xe_gt_sriov_vf_connect(struct xe_gt *gt);
+int xe_gt_sriov_vf_query_runtime(struct xe_gt *gt);
+
+void xe_gt_sriov_vf_print_config(struct xe_gt *gt, struct drm_printer *p);
+void xe_gt_sriov_vf_print_runtime(struct xe_gt *gt, struct drm_printer *p);
+void xe_gt_sriov_vf_print_version(struct xe_gt *gt, struct drm_printer *p);
+
+#endif

drivers/gpu/drm/xe/xe_gt_sriov_vf_types.h

+/* SPDX-License-Identifier: MIT */
+/*
+ * Copyright © 2023-2024 Intel Corporation
+ */
+
+#ifndef _XE_GT_SRIOV_VF_TYPES_H_
+#define _XE_GT_SRIOV_VF_TYPES_H_
+
+#include <linux/types.h>
+
+/**
+ * struct xe_gt_sriov_vf_guc_version - GuC ABI version details.
+ */
+struct xe_gt_sriov_vf_guc_version {
+	/** @branch: branch version. */
+	u8 branch;
+	/** @major: major version. */
+	u8 major;
+	/** @minor: minor version. */
+	u8 minor;
+	/** @patch: patch version. */
+	u8 patch;
+};
+
+/**
+ * struct xe_gt_sriov_vf_relay_version - PF ABI version details.
+ */
+struct xe_gt_sriov_vf_relay_version {
+	/** @major: major version. */
+	u16 major;
+	/** @minor: minor version. */
+	u16 minor;
+};
+
+/**
+ * struct xe_gt_sriov_vf_selfconfig - VF configuration data.
+ */
+struct xe_gt_sriov_vf_selfconfig {
+	/** @ggtt_base: assigned base offset of the GGTT region. */
+	u64 ggtt_base;
+	/** @ggtt_size: assigned size of the GGTT region. */
+	u64 ggtt_size;
+	/** @lmem_size: assigned size of the LMEM. */
+	u64 lmem_size;
+	/** @num_ctxs: assigned number of GuC submission context IDs. */
+	u16 num_ctxs;
+	/** @num_dbs: assigned number of GuC doorbells IDs. */
+	u16 num_dbs;
+};
+
+/**
+ * struct xe_gt_sriov_vf_runtime - VF runtime data.
+ */
+struct xe_gt_sriov_vf_runtime {
+	/** @regs_size: size of runtime register array. */
+	u32 regs_size;
+	/** @num_regs: number of runtime registers in the array. */
+	u32 num_regs;
+	/** @regs: pointer to array of register offset/value pairs. */
+	struct vf_runtime_reg {
+		/** @regs.offset: register offset. */
+		u32 offset;
+		/** @regs.value: register value. */
+		u32 value;
+	} *regs;
+};
+
+/**
+ * struct xe_gt_sriov_vf - GT level VF virtualization data.
+ */
+struct xe_gt_sriov_vf {
+	/** @guc_version: negotiated GuC ABI version. */
+	struct xe_gt_sriov_vf_guc_version guc_version;
+	/** @self_config: resource configurations. */
+	struct xe_gt_sriov_vf_selfconfig self_config;
+	/** @pf_version: negotiated VF/PF ABI version. */
+	struct xe_gt_sriov_vf_relay_version pf_version;
+	/** @runtime: runtime data retrieved from the PF. */
+	struct xe_gt_sriov_vf_runtime runtime;
+};
+
+#endif

drivers/gpu/drm/xe/xe_gt_types.h

@@ -9,6 +9,7 @@
 #include "xe_force_wake_types.h"
 #include "xe_gt_idle_types.h"
 #include "xe_gt_sriov_pf_types.h"
+#include "xe_gt_sriov_vf_types.h"
 #include "xe_hw_engine_types.h"
 #include "xe_hw_fence_types.h"
 #include "xe_reg_sr_types.h"
@@ -143,6 +144,8 @@ struct xe_gt {
 	union {
 		/** @sriov.pf: PF data. Valid only if driver is running as PF */
 		struct xe_gt_sriov_pf pf;
+		/** @sriov.vf: VF data. Valid only if driver is running as VF */
+		struct xe_gt_sriov_vf vf;
 	} sriov;
 
 	/**