drm/xe/pf: Introduce helper functions for use by PF

PF driver will maintain VF's configuration data mostly on the
GT level, but some internal data is located at the device level.

To allow easy access to that data from the GT level functions, and
to minimize code duplications, introduce set of helper functions
and macros for explicit use by the PF driver.

We will use these helpers in upcoming patches.
Reviewed-by: Piotr Piórkowski <piotr.piorkowski@intel.com>
Signed-off-by: Michal Wajdeczko <michal.wajdeczko@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240410170338.1199-3-michal.wajdeczko@intel.com

drivers/gpu/drm/xe/xe_gt_sriov_pf_helpers.h

+/* SPDX-License-Identifier: MIT */
+/*
+ * Copyright © 2023-2024 Intel Corporation
+ */
+
+#ifndef _XE_GT_SRIOV_PF_HELPERS_H_
+#define _XE_GT_SRIOV_PF_HELPERS_H_
+
+#include "xe_gt_types.h"
+#include "xe_sriov_pf_helpers.h"
+
+/**
+ * xe_gt_sriov_pf_assert_vfid() - warn if &id is not a supported VF number when debugging.
+ * @gt: the PF &xe_gt to assert on
+ * @vfid: the VF number to assert
+ *
+ * Assert that &gt belongs to the Physical Function (PF) device and provided &vfid
+ * is within a range of supported VF numbers (up to maximum number of VFs that
+ * driver can support, including VF0 that represents the PF itself).
+ *
+ * Note: Effective only on debug builds. See `Xe ASSERTs`_ for more information.
+ */
+#define xe_gt_sriov_pf_assert_vfid(gt, vfid)	xe_sriov_pf_assert_vfid(gt_to_xe(gt), (vfid))
+
+static inline int xe_gt_sriov_pf_get_totalvfs(struct xe_gt *gt)
+{
+	return xe_sriov_pf_get_totalvfs(gt_to_xe(gt));
+}
+
+static inline struct mutex *xe_gt_sriov_pf_master_mutex(struct xe_gt *gt)
+{
+	return xe_sriov_pf_master_mutex(gt_to_xe(gt));
+}
+
+#endif

drivers/gpu/drm/xe/xe_sriov_pf_helpers.h

+/* SPDX-License-Identifier: MIT */
+/*
+ * Copyright © 2023-2024 Intel Corporation
+ */
+
+#ifndef _XE_SRIOV_PF_HELPERS_H_
+#define _XE_SRIOV_PF_HELPERS_H_
+
+#include "xe_assert.h"
+#include "xe_device_types.h"
+#include "xe_sriov.h"
+#include "xe_sriov_types.h"
+
+/**
+ * xe_sriov_pf_assert_vfid() - warn if &id is not a supported VF number when debugging.
+ * @xe: the PF &xe_device to assert on
+ * @vfid: the VF number to assert
+ *
+ * Assert that &xe represents the Physical Function (PF) device and provided &vfid
+ * is within a range of supported VF numbers (up to maximum number of VFs that
+ * driver can support, including VF0 that represents the PF itself).
+ *
+ * Note: Effective only on debug builds. See `Xe ASSERTs`_ for more information.
+ */
+#define xe_sriov_pf_assert_vfid(xe, vfid) \
+	xe_assert((xe), (vfid) <= xe_sriov_pf_get_totalvfs(xe))
+
+/**
+ * xe_sriov_pf_get_totalvfs() - Get maximum number of VFs that driver can support.
+ * @xe: the &xe_device to query (shall be PF)
+ *
+ * Return: Maximum number of VFs that this PF driver supports.
+ */
+static inline int xe_sriov_pf_get_totalvfs(struct xe_device *xe)
+{
+	xe_assert(xe, IS_SRIOV_PF(xe));
+	return xe->sriov.pf.driver_max_vfs;
+}
+
+static inline struct mutex *xe_sriov_pf_master_mutex(struct xe_device *xe)
+{
+	xe_assert(xe, IS_SRIOV_PF(xe));
+	return &xe->sriov.pf.master_lock;
+}
+
+#endif