pci: Use conftest to find if pci_epc_event_ops struct has core_deinit

Use the conftest to find if the struct pci_epc_event_ops has
core_deinit as callback function. This callback is added
by Nvidia in core kernel.

Bug 4346767

Change-Id: I399197917ac7746ca367f55b9dc4e3a5bd79f073
Signed-off-by: Laxman Dewangan <ldewangan@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/c/linux-nv-oot/+/3028740
Reviewed-by: Shardar Mohammed <smohammed@nvidia.com>
GVS: Gerrit_Virtual_Submit <buildbot_gerritrpt@nvidia.com>

Makefile

@@ -55,9 +55,6 @@ subdir-ccflags-y += -DNV_DROP_PCIE_ERROR_REPORTING
 # Drop the API for pcie_disable_pcie_error_reporting
 subdir-ccflags-y += -DNV_PCIE_DIABLE_PCIE_ERROR_REPORTING_DROP
 
-# PCIE DMA EPF core deinit not implemented in core kernel
-subdir-ccflags-y += -DNV_PCIE_DMA_EPF_CORE_DEINIT_NOT_AVAILABLE
-
 # PCIE EPF driver probe has additional argument as ID
 subdir-ccflags-y += -DNV_PCIE_EFP_DRIVER_PROBE_HAS_ID_ARG
 

drivers/misc/nvscic2c-pcie/epf/module.c

@@ -1,6 +1,8 @@
 // SPDX-License-Identifier: GPL-2.0-only
 // Copyright (c) 2022-2023, NVIDIA CORPORATION & AFFILIATES. All rights reserved.
 
+#include <nvidia/conftest.h>
+
 #define pr_fmt(fmt)	"nvscic2c-pcie: epf: " fmt
 
 #include <linux/init.h>
@@ -169,7 +171,7 @@ allocate_outbound_area(struct pci_epf *epf, size_t win_size,
 	return ret;
 }
 
-#if !defined(NV_PCIE_DMA_EPF_CORE_DEINIT_NOT_AVAILABLE)
+#if defined(NV_PCI_EPC_EVENT_OPS_STRUCT_HAS_CORE_DEINIT) /* Nvidia Internal */
 static void
 clear_inbound_translation(struct pci_epf *epf)
 {
@@ -492,7 +494,7 @@ deinit_work(struct work_struct *work)
  * @DRV_MODE_EPC would have already gone then by the time
  * struct pci_epc_event_ops.core_deinit is called.
  */
-#if !defined(NV_PCIE_DMA_EPF_CORE_DEINIT_NOT_AVAILABLE)
+#if defined(NV_PCI_EPC_EVENT_OPS_STRUCT_HAS_CORE_DEINIT) /* Nvidia Internal */
 static int
 nvscic2c_pcie_epf_core_deinit(struct pci_epf *epf)
 {
@@ -733,7 +735,7 @@ get_driverdata(const struct pci_epf_device_id *id,
 
 static const struct pci_epc_event_ops nvscic2c_event_ops = {
 	.core_init = nvscic2c_pcie_epf_core_init,
-#if !defined(NV_PCIE_DMA_EPF_CORE_DEINIT_NOT_AVAILABLE)
+#if defined(NV_PCI_EPC_EVENT_OPS_STRUCT_HAS_CORE_DEINIT) /* Nvidia Internal */
 	.core_deinit = nvscic2c_pcie_epf_core_deinit,
 #endif
 };

drivers/pci/endpoint/functions/pci-epf-dma-test.c

@@ -5,6 +5,8 @@
  * Copyright (C) 2021-2023 NVIDIA Corporation. All rights reserved.
  */
 
+#include <nvidia/conftest.h>
+
 #include <linux/crc32.h>
 #include <linux/debugfs.h>
 #include <linux/delay.h>
@@ -164,7 +166,7 @@ static int pcie_dma_epf_core_init(struct pci_epf *epf)
 	return 0;
 }
 
-#if !defined(NV_PCIE_DMA_EPF_CORE_DEINIT_NOT_AVAILABLE)
+#if defined(NV_PCI_EPC_EVENT_OPS_STRUCT_HAS_CORE_DEINIT) /* Nvidia Internal */
 static int pcie_dma_epf_core_deinit(struct pci_epf *epf)
 {
 	struct pcie_epf_dma *epfnv = epf_get_drvdata(epf);
@@ -265,7 +267,7 @@ static const struct pci_epf_device_id pcie_dma_epf_ids[] = {
 
 static const struct pci_epc_event_ops pci_epf_dma_test_event_ops = {
 	.core_init = pcie_dma_epf_core_init,
-#if !defined(NV_PCIE_DMA_EPF_CORE_DEINIT_NOT_AVAILABLE)
+#if defined(NV_PCI_EPC_EVENT_OPS_STRUCT_HAS_CORE_DEINIT) /* Nvidia Internal */
 	.core_deinit = pcie_dma_epf_core_deinit,
 #endif
 };

scripts/conftest/Makefile

@@ -126,6 +126,7 @@ NV_CONFTEST_FUNCTION_COMPILE_TESTS += netif_set_tso_max_size
 NV_CONFTEST_FUNCTION_COMPILE_TESTS += netif_napi_add_weight
 NV_CONFTEST_FUNCTION_COMPILE_TESTS += pde_data
 NV_CONFTEST_FUNCTION_COMPILE_TESTS += pwm_ops_struct_has_owner
+NV_CONFTEST_FUNCTION_COMPILE_TESTS += pci_epc_event_ops_struct_has_core_deinit
 NV_CONFTEST_FUNCTION_COMPILE_TESTS += register_shrinker_has_fmt_arg
 NV_CONFTEST_FUNCTION_COMPILE_TESTS += shrinker_alloc
 NV_CONFTEST_FUNCTION_COMPILE_TESTS += snd_soc_card_jack_new_has_no_snd_soc_jack_pins

scripts/conftest/conftest.sh

@@ -7017,6 +7017,22 @@ compile_test() {
             compile_check_conftest "$CODE" "NV_PWM_OPS_STRUCT_HAS_OWNER" "" "types"
         ;;
 
+        pci_epc_event_ops_struct_has_core_deinit)
+            #
+            # Determine if the pci_epc_event_ops struct has the core_deinit function.
+            #
+            # Added by commit 3d99b5acdd3191c ("NVIDIA: SAUCE: PCI: endpoint: Add core_deinit()
+            # callback support") from Nvidia PCI improvement.
+            #
+            CODE="
+            #include <linux/pci-epf.h>
+            int conftest_pci_epc_event_ops_struct_has_core_deinit(void) {
+                return offsetof(struct pci_epc_event_ops, core_deinit);
+            }"
+
+            compile_check_conftest "$CODE" "NV_PCI_EPC_EVENT_OPS_STRUCT_HAS_CORE_DEINIT" "" "types"
+        ;;
+
         register_shrinker_has_fmt_arg)
             #
             # Determine if the 'register_shrinker' function