MODS Online IST SMC support

Summary: This change adds support in mods kernel
driver to send messages to ATF using SMC interface in
order to fetch the Online IST test results.

JIRA TM-206

Change-Id: Iafa397287d7af63d77c51308345a9dc93d3a922f
Signed-off-by: Anshul Goel <ansgoel@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/c/linux-nvidia/+/2630148
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>
Reviewed-by: svc-mobile-coverity <svc-mobile-coverity@nvidia.com>
Reviewed-by: svc-mobile-cert <svc-mobile-cert@nvidia.com>
Reviewed-by: Bibek Basu <bbasu@nvidia.com>
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
GVS: Gerrit_Virtual_Submit

drivers/misc/mods/Makefile

@@ -10,6 +10,7 @@ mods-$(CONFIG_PCI)                 += mods_pci.o
 mods-$(CONFIG_ACPI)                += mods_acpi.o
 mods-$(CONFIG_DMA_SHARED_BUFFER)   += mods_dmabuf.o
 mods-$(CONFIG_ARCH_TEGRA)          += mods_smmu_drv.o
+mods-$(CONFIG_ARCH_TEGRA)          += mods_oist.o
 mods-$(CONFIG_DMA_ENGINE)          += mods_dma.o
 mods-$(CONFIG_DEBUG_FS)            += mods_debugfs.o
 mods-$(CONFIG_TEGRA_DC)            += mods_tegradc.o

drivers/misc/mods/mods_internal.h

@@ -2,7 +2,7 @@
 /*
  * mods_internal.h - This file is part of NVIDIA MODS kernel driver.
  *
- * Copyright (c) 2008-2021, NVIDIA CORPORATION. All rights reserved.
+ * Copyright (c) 2008-2022, NVIDIA CORPORATION. All rights reserved.
  *
  * NVIDIA MODS kernel driver is free software: you can redistribute it and/or
  * modify it under the terms of the GNU General Public License,
@@ -637,6 +637,10 @@ int esc_mods_dma_free_coherent(struct mods_client                  *client,
 int esc_mods_dma_copy_to_user(struct mods_client           *client,
 			      struct MODS_DMA_COPY_TO_USER *p);
 
+/* oist */
+int esc_mods_oist_status(struct mods_client             *client,
+			     struct MODS_TEGRA_OIST_STATUS  *p);
+
 #ifdef CONFIG_DMA_ENGINE
 int esc_mods_dma_request_channel(struct mods_client     *client,
 				 struct MODS_DMA_HANDLE *p);

drivers/misc/mods/mods_krnl.c

@@ -2,7 +2,7 @@
 /*
  * mods_krnl.c - This file is part of NVIDIA MODS kernel driver.
  *
- * Copyright (c) 2008-2021, NVIDIA CORPORATION.  All rights reserved.
+ * Copyright (c) 2008-2022, NVIDIA CORPORATION.  All rights reserved.
  *
  * NVIDIA MODS kernel driver is free software: you can redistribute it and/or
  * modify it under the terms of the GNU General Public License,
@@ -2546,6 +2546,11 @@ static long mods_krnl_ioctl(struct file  *fp,
 		MODS_IOCTL(MODS_ESC_SEND_TZ_MSG,
 			esc_mods_send_trustzone_msg, MODS_TZ_PARAMS);
 		break;
+
+	case MODS_ESC_OIST_STATUS:
+		MODS_IOCTL(MODS_ESC_OIST_STATUS,
+			   esc_mods_oist_status, MODS_TEGRA_OIST_STATUS);
+		break;
 #endif
 
 	case MODS_ESC_ACQUIRE_ACCESS_TOKEN:

drivers/misc/mods/mods_oist.c

@@ -0,0 +1,36 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (c) 2022, NVIDIA CORPORATION.  All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ */
+
+#include "mods_internal.h"
+#include <linux/arm-smccc.h>
+
+#define SMCCC_VERSION 0x80000000
+
+int esc_mods_oist_status(struct mods_client             *client,
+		struct MODS_TEGRA_OIST_STATUS  *p)
+{
+	int ret = 0;
+	struct arm_smccc_res res = { 0 };
+
+	if (p->smc_func_id == SMCCC_VERSION) {
+		// For SMC version, We are only reading res.a0 value, not a1,a2,a3
+		arm_smccc_1_1_smc(p->smc_func_id, res.a0, &res);
+		p->smc_status = res.a0;
+	} else {
+		arm_smccc_1_1_smc(p->smc_func_id, p->a1, p->a2, &res);
+		p->smc_status = res.a1;
+	}
+
+	return ret;
+}

include/uapi/misc/mods.h

@@ -2,7 +2,7 @@
 /*
  * mods.h - This file is part of NVIDIA MODS kernel driver.
  *
- * Copyright (c) 2008-2021, NVIDIA CORPORATION.  All rights reserved.
+ * Copyright (c) 2008-2022, NVIDIA CORPORATION.  All rights reserved.
  *
  * NVIDIA MODS kernel driver is free software: you can redistribute it and/or
  * modify it under the terms of the GNU General Public License,
@@ -1795,6 +1795,21 @@ struct MODS_TZ_PARAMS {
 	int status;
 };
 
+/* Used by MODS_ESC_OIST_STATUS ioctl.
+ *
+ * Available only on Tegra.
+ */
+struct MODS_TEGRA_OIST_STATUS {
+	/* IN */
+	__u64 smc_func_id;
+	/* IN */
+	__u64 a1;
+	/* IN */
+	__u64 a2;
+	/* OUT */
+	__u64 smc_status;
+};
+
 #define MODS_IOMMU_MAP_CONTIGUOUS 1
 
 #pragma pack(pop)
@@ -1995,5 +2010,6 @@ struct MODS_TZ_PARAMS {
 #define MODS_ESC_BPMP_SET_PCIE_STATE MODSIO(W, 136, MODS_SET_PCIE_STATE)
 #define MODS_ESC_BPMP_INIT_PCIE_EP_PLL MODSIO(W, 137, MODS_INIT_PCIE_EP_PLL)
 #define MODS_ESC_SEND_TZ_MSG MODSIO(WR, 139, MODS_TZ_PARAMS)
+#define MODS_ESC_OIST_STATUS MODSIO(WR, 140, MODS_TEGRA_OIST_STATUS)
 
 #endif /* _UAPI_MODS_H_  */