scsi: ufs: Use conftest for suspend differences

In Linux v5.19, the arguments to the 'suspend' function pointer defined
in the structure 'ufs_hba_variant_ops' was updated to add a 'status'
argument. Add a new test to the conftest script that checks if the
'suspend' function has a 'status' argument and use the definition
created by conftest to select which structure member is used.

This is beneficial for working with 3rd party Linux kernels that may
have back-ported upstream changes into their kernel and so the kernel
version checks do not work.

Bug 4221847

Change-Id: I05011a4a1aff7c54cd258147d6519b696904a2de
Signed-off-by: Jon Hunter <jonathanh@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/c/linux-nv-oot/+/2996214
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>

drivers/scsi/ufs/ufs-tegra-common.c

@@ -1,6 +1,8 @@
 // SPDX-License-Identifier: GPL-2.0-only
 // Copyright (c) 2015-2023 NVIDIA CORPORATION & AFFILIATES.  All rights reserved.
 
+#include <nvidia/conftest.h>
+
 #include <linux/clk.h>
 #include <linux/delay.h>
 #include <linux/time.h>
@@ -965,11 +967,11 @@ static void ufs_tegra_context_restore(struct ufs_tegra_host *ufs_tegra)
 	}
 }
 
-#if LINUX_VERSION_CODE < KERNEL_VERSION(5, 16, 0)
+#if defined(NV_UFS_HBA_VARIANT_OPS_SUSPEND_HAS_STATUS_ARG)
-static int ufs_tegra_suspend(struct ufs_hba *hba, enum ufs_pm_op pm_op)
-#else
 static int ufs_tegra_suspend(struct ufs_hba *hba, enum ufs_pm_op pm_op,
 		enum ufs_notify_change_status status)
+#else
+static int ufs_tegra_suspend(struct ufs_hba *hba, enum ufs_pm_op pm_op)
 #endif
 {
 	struct ufs_tegra_host *ufs_tegra = hba->priv;

scripts/conftest/Makefile

@@ -146,6 +146,7 @@ NV_CONFTEST_FUNCTION_COMPILE_TESTS += tc_taprio_qopt_offload_struct_has_cmd
 NV_CONFTEST_FUNCTION_COMPILE_TESTS += tegra_dev_iommu_get_stream_id
 NV_CONFTEST_FUNCTION_COMPILE_TESTS += tegra_ivc_struct_has_iosys_map
 NV_CONFTEST_FUNCTION_COMPILE_TESTS += tty_operations_struct_write_has_u8_ptr_arg
+NV_CONFTEST_FUNCTION_COMPILE_TESTS += ufs_hba_variant_ops_suspend_has_status_arg
 NV_CONFTEST_FUNCTION_COMPILE_TESTS += v4l2_async_connection_struct_present
 NV_CONFTEST_FUNCTION_COMPILE_TESTS += v4l2_async_match_type_enum_present
 NV_CONFTEST_FUNCTION_COMPILE_TESTS += v4l2_async_subdev_nf_init
@@ -181,7 +182,8 @@ NV_HEADER_PRESENCE_TESTS = \
   linux/iosys-map.h \
   net/gso.h \
   net/page_pool.h \
-  soc/tegra/tegra-prod.h
+  soc/tegra/tegra-prod.h \
+  ufs/ufshcd.h
 
 # Filename to store the define for the header in $(1); this is only consumed by
 # the rule below that concatenates all of these together.

scripts/conftest/conftest.sh

@@ -7399,6 +7399,31 @@ compile_test() {
             compile_check_conftest "$CODE" "NV_TTY_OPERATIONS_STRUCT_WRITE_HAS_U8_PTR_ARG" "" "functions"
         ;;
 
+        ufs_hba_variant_ops_suspend_has_status_arg)
+            #
+            # Determine if the 'suspend' function for the
+            # 'struct ufs_hba_variant_ops' has a 'status' argument.
+            #
+            # In Linux v5.16, commit 9561f58442e4 ("scsi: ufs:
+            # mediatek: Support vops pre suspend to disable auto-hibern8")
+            # updated the arguments to the 'suspend' function of the
+            # 'struct ufs_hba_variant_ops'.
+            #
+            CODE="
+            #if defined(NV_UFS_UFSHCD_H_PRESENT)
+            #include <ufs/ufshcd.h>
+            #else
+            #include \"../drivers/scsi/ufs/ufshcd.h\"
+            #endif
+            void conftest_ufs_hba_variant_ops_suspend_has_status_arg(
+                struct ufs_hba_variant_ops *ops) {
+                    int (*fn)(struct ufs_hba *, enum ufs_pm_op,
+                    enum ufs_notify_change_status) = ops->suspend;
+            }"
+
+            compile_check_conftest "$CODE" "NV_UFS_HBA_VARIANT_OPS_SUSPEND_HAS_STATUS_ARG" "" "types"
+        ;;
+
         v4l2_async_connection_struct_present)
             #
             # Determine if the 'struct v4l2_async_connection' present or not.