[PATCH 2/6] firmware: arm_rmm: Add wrappers for direct RMI calls

[Steven Price <steven.price@arm.com>]

The wrappers make the call sites easier to read and deal with the
boilerplate of handling the error codes from the RMM.

Signed-off-by: Steven Price <steven.price@arm.com>
---
Changes from v14:
 * Update to RMM v2.0-bet2 spec.
 * Move SRO related wrappers to a later patch due to dependencies.
 * Common wrappers are split into include/linux/arm-rmi-cmds.h.
Changes from v13:
 * Update to RMM v2.0-bet1 spec including some SRO support (there still
   some FIXMEs where SRO support is incomplete).
Changes from v12:
 * Update to RMM v2.0 specification
Changes from v8:
 * Switch from arm_smccc_1_2_smc() to arm_smccc_1_2_invoke() in
   rmi_rtt_read_entry() for consistency.
Changes from v7:
 * Minor renaming of parameters and updated comments
Changes from v5:
 * Further improve comments
Changes from v4:
 * Improve comments
Changes from v2:
 * Make output arguments optional.
 * Mask RIPAS value rmi_rtt_read_entry()
 * Drop unused rmi_rtt_get_phys()
---
 arch/arm64/include/asm/rmi_cmds.h | 67 +++++++++++++++++++++++
 include/linux/arm-rmi-cmds.h      | 91 +++++++++++++++++++++++++++++++
 2 files changed, 158 insertions(+)
 create mode 100644 arch/arm64/include/asm/rmi_cmds.h
 create mode 100644 include/linux/arm-rmi-cmds.h

diff --git a/arch/arm64/include/asm/rmi_cmds.h b/arch/arm64/include/asm/rmi_cmds.h
new file mode 100644
index 000000000000..7eb2c8d7f7fa
--- /dev/null
+++ b/arch/arm64/include/asm/rmi_cmds.h
@@ -0,0 +1,67 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (C) 2023-2026 ARM Ltd.
+ */
+
+#ifndef __ASM_RMI_CMDS_H
+#define __ASM_RMI_CMDS_H
+
+#include <linux/arm-rmi-cmds.h>
+#include <linux/arm-smccc-rmi.h>
+
+/**
+ * rmi_psci_complete() - Complete pending PSCI command
+ * @calling_rec: PA of the calling REC
+ * @status: Status of the PSCI request
+ *
+ * Completes a pending PSCI command.
+ *
+ * Return: RMI return code
+ */
+static inline int rmi_psci_complete(unsigned long calling_rec,
+				    unsigned long status)
+{
+	struct arm_smccc_res res;
+
+	arm_smccc_1_1_invoke(SMC_RMI_PSCI_COMPLETE, calling_rec, status, &res);
+
+	return res.a0;
+}
+
+/**
+ * rmi_realm_activate() - Active a realm
+ * @rd: PA of the RD
+ *
+ * Mark a realm as Active signalling that creation is complete and allowing
+ * execution of the realm.
+ *
+ * Return: RMI return code
+ */
+static inline int rmi_realm_activate(unsigned long rd)
+{
+	struct arm_smccc_res res;
+
+	arm_smccc_1_1_invoke(SMC_RMI_REALM_ACTIVATE, rd, &res);
+
+	return res.a0;
+}
+
+/**
+ * rmi_rec_enter() - Enter a REC
+ * @rec: PA of the target REC
+ * @run_ptr: PA of RecRun structure
+ *
+ * Starts (or continues) execution within a REC.
+ *
+ * Return: RMI return code
+ */
+static inline int rmi_rec_enter(unsigned long rec, unsigned long run_ptr)
+{
+	struct arm_smccc_res res;
+
+	arm_smccc_1_1_invoke(SMC_RMI_REC_ENTER, rec, run_ptr, &res);
+
+	return res.a0;
+}
+
+#endif /* __ASM_RMI_CMDS_H */
diff --git a/include/linux/arm-rmi-cmds.h b/include/linux/arm-rmi-cmds.h
new file mode 100644
index 000000000000..c038c1d685fa
--- /dev/null
+++ b/include/linux/arm-rmi-cmds.h
@@ -0,0 +1,91 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (C) 2026 ARM Ltd.
+ */
+
+#ifndef __LINUX_ARM_RMI_CMDS_H_
+#define __LINUX_ARM_RMI_CMDS_H_
+
+#include <linux/arm-smccc-rmi.h>
+#include <linux/bug.h>
+#include <linux/types.h>
+
+#include <asm/page.h>
+
+struct rtt_entry {
+	unsigned long walk_level;
+	unsigned long desc;
+	int state;
+	int ripas;
+};
+
+unsigned long rmi_feat_reg(unsigned long id);
+
+bool is_rmi_available(void);
+
+/**
+ * rmi_rmm_config_set() - Configure the RMM
+ * @cfg_ptr: PA of a struct rmm_config
+ *
+ * Sets configuration options on the RMM.
+ *
+ * Return: RMI return code
+ */
+static inline int rmi_rmm_config_set(unsigned long cfg_ptr)
+{
+	struct arm_smccc_res res;
+
+	arm_smccc_1_1_invoke(SMC_RMI_RMM_CONFIG_SET, cfg_ptr, &res);
+
+	return res.a0;
+}
+
+/**
+ * rmi_granule_tracking_get() - Get configuration of a Granule tracking region
+ * @start: Base PA of the tracking region
+ * @end: End of the PA region
+ * @out_category: Memory category
+ * @out_state: Tracking region state
+ * @out_top: Top of the memory region
+ *
+ * Return: RMI return code
+ */
+static inline int rmi_granule_tracking_get(unsigned long start,
+					   unsigned long end,
+					   unsigned long *out_category,
+					   unsigned long *out_state,
+					   unsigned long *out_top)
+{
+	struct arm_smccc_res res;
+
+	arm_smccc_1_1_invoke(SMC_RMI_GRANULE_TRACKING_GET, start, end, &res);
+
+	if (out_category)
+		*out_category = res.a1;
+	if (out_state)
+		*out_state = res.a2;
+	if (out_top)
+		*out_top = res.a3;
+
+	return res.a0;
+}
+
+/**
+ * rmi_features() - Read feature register
+ * @index: Feature register index
+ * @out: Feature register value is written to this pointer
+ *
+ * Return: RMI return code
+ */
+static inline int rmi_features(unsigned long index, unsigned long *out)
+{
+	struct arm_smccc_res res;
+
+	arm_smccc_1_1_invoke(SMC_RMI_FEATURES, index, &res);
+
+	if (out)
+		*out = res.a1;
+	return res.a0;
+}
+
+#endif
-- 
2.43.0