pci: endpoint: Update drivers for Linux v6.11

For Linux v6.11, the 'pci_epc_event_ops' structure 'core_init' callback
was renamed to 'epc_init' and a new 'epc_deinit' callback was added.

Update the PCI endpoint drivers for Linux v6.11 by:

 1. Adding tests to conftest to detect the presence of 'epc_init' and
    'epc_deinit'.
 2. Update the drivers as necessary to use the appropriate callback
    depending upon what is present in the kernel.

Bug 4749580

Change-Id: Ife7e2d5d18332bf84f22142c9727dc1ece913c49
Signed-off-by: Jon Hunter <jonathanh@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/c/linux-nv-oot/+/3186686
(cherry picked from commit b0ff4f1358)
Reviewed-on: https://git-master.nvidia.com/r/c/linux-nv-oot/+/3219305
GVS: buildbot_gerritrpt <buildbot_gerritrpt@nvidia.com>
Reviewed-by: Brad Griffis <bgriffis@nvidia.com>

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

@@ -171,7 +171,8 @@ allocate_outbound_area(struct pci_epf *epf, size_t win_size,
 	return ret;
 }
 
-#if defined(NV_PCI_EPC_EVENT_OPS_STRUCT_HAS_CORE_DEINIT) /* Nvidia Internal */
+#if defined(NV_PCI_EPC_EVENT_OPS_STRUCT_HAS_EPC_DEINIT) || \
+    defined(NV_PCI_EPC_EVENT_OPS_STRUCT_HAS_CORE_DEINIT) /* Linux v6.11 || Nvidia Internal */
 static void
 clear_inbound_translation(struct pci_epf *epf)
 {
@@ -494,7 +495,8 @@ 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_PCI_EPC_EVENT_OPS_STRUCT_HAS_CORE_DEINIT) /* Nvidia Internal */
+#if defined(NV_PCI_EPC_EVENT_OPS_STRUCT_HAS_EPC_DEINIT) || \
+    defined(NV_PCI_EPC_EVENT_OPS_STRUCT_HAS_CORE_DEINIT) /* Linux v6.11 || Nvidia Internal */
 static int
 nvscic2c_pcie_epf_core_deinit(struct pci_epf *epf)
 {
@@ -522,6 +524,13 @@ nvscic2c_pcie_epf_core_deinit(struct pci_epf *epf)
 
 	return 0;
 }
+
+#if defined(NV_PCI_EPC_EVENT_OPS_STRUCT_HAS_EPC_DEINIT)
+static void nvscic2c_pcie_epf_epc_deinit(struct pci_epf *epf)
+{
+	WARN_ON(nvscic2c_pcie_epf_core_deinit(epf));
+}
+#endif
 #endif
 
 /* Handle link message from @DRV_MODE_EPC. */
@@ -734,8 +743,14 @@ get_driverdata(const struct pci_epf_device_id *id,
 }
 
 static const struct pci_epc_event_ops nvscic2c_event_ops = {
+#if defined(NV_PCI_EPC_EVENT_OPS_STRUCT_HAS_EPC_INIT) /* Linux v6.11 */
+	.epc_init = nvscic2c_pcie_epf_core_init,
+#else
 	.core_init = nvscic2c_pcie_epf_core_init,
-#if defined(NV_PCI_EPC_EVENT_OPS_STRUCT_HAS_CORE_DEINIT) /* Nvidia Internal */
+#endif
+#if defined(NV_PCI_EPC_EVENT_OPS_STRUCT_HAS_EPC_DEINIT) /* Linux v6.11 */
+	.epc_deinit = nvscic2c_pcie_epf_epc_deinit,
+#elif 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

@@ -170,7 +170,8 @@ static int pcie_dma_epf_core_init(struct pci_epf *epf)
 	return 0;
 }
 
-#if defined(NV_PCI_EPC_EVENT_OPS_STRUCT_HAS_CORE_DEINIT) /* Nvidia Internal */
+#if defined(NV_PCI_EPC_EVENT_OPS_STRUCT_HAS_EPC_DEINIT) || \
+    defined(NV_PCI_EPC_EVENT_OPS_STRUCT_HAS_CORE_DEINIT) /* Linux v6.11 || Nvidia Internal */
 static int pcie_dma_epf_core_deinit(struct pci_epf *epf)
 {
 	struct pcie_epf_dma *epfnv = epf_get_drvdata(epf);
@@ -186,6 +187,13 @@ static int pcie_dma_epf_core_deinit(struct pci_epf *epf)
 
 	return 0;
 }
+
+#if defined(NV_PCI_EPC_EVENT_OPS_STRUCT_HAS_EPC_DEINIT)
+static void pcie_dma_epf_epc_deinit(struct pci_epf *epf)
+{
+	pcie_dma_epf_core_deinit(epf);
+}
+#endif
 #endif
 
 static void pcie_dma_epf_unbind(struct pci_epf *epf)
@@ -283,8 +291,14 @@ static const struct pci_epf_device_id pcie_dma_epf_ids[] = {
 };
 
 static const struct pci_epc_event_ops pci_epf_dma_test_event_ops = {
+#if defined(NV_PCI_EPC_EVENT_OPS_STRUCT_HAS_EPC_INIT) /* Linux v6.11 */
+	.epc_init = pcie_dma_epf_core_init,
+#else
 	.core_init = pcie_dma_epf_core_init,
-#if defined(NV_PCI_EPC_EVENT_OPS_STRUCT_HAS_CORE_DEINIT) /* Nvidia Internal */
+#endif
+#if defined(NV_PCI_EPC_EVENT_OPS_STRUCT_HAS_EPC_DEINIT) /* Linux v6.11 */
+	.epc_deinit = pcie_dma_epf_epc_deinit,
+#elif defined(NV_PCI_EPC_EVENT_OPS_STRUCT_HAS_CORE_DEINIT) /* Nvidia Internal */
 	.core_deinit = pcie_dma_epf_core_deinit,
 #endif
 };

drivers/pci/endpoint/functions/pci-epf-tegra-vnet.c

@@ -1631,7 +1631,8 @@ static void tvnet_ep_pci_epf_linkup(struct pci_epf *epf)
 #endif
 
 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(5, 14, 0))
-#if defined(NV_PCI_EPC_EVENT_OPS_STRUCT_HAS_CORE_DEINIT)
+#if defined(NV_PCI_EPC_EVENT_OPS_STRUCT_HAS_EPC_DEINIT) || \
+    defined(NV_PCI_EPC_EVENT_OPS_STRUCT_HAS_CORE_DEINIT) /* Linux v6.11 || Nvidia Internal */
 static int tvnet_ep_pci_epf_core_deinit(struct pci_epf *epf)
 {
 	struct pci_epf_bar *epf_bar = &epf->bar[BAR_0];
@@ -1647,11 +1648,24 @@ static int tvnet_ep_pci_epf_core_deinit(struct pci_epf *epf)
 
 	return 0;
 }
+
+#if defined(NV_PCI_EPC_EVENT_OPS_STRUCT_HAS_EPC_DEINIT)
+static void tvnet_ep_pci_epf_epc_deinit(struct pci_epf *epf)
+{
+	WARN_ON(tvnet_ep_pci_epf_core_deinit(epf));
+}
+#endif
 #endif
 
 static const struct pci_epc_event_ops tvnet_event_ops = {
+#if defined(NV_PCI_EPC_EVENT_OPS_STRUCT_HAS_EPC_INIT) /* Linux v6.11 */
+	.epc_init = tvnet_ep_pci_epf_core_init,
+#else
 	.core_init = tvnet_ep_pci_epf_core_init,
-#if defined(NV_PCI_EPC_EVENT_OPS_STRUCT_HAS_CORE_DEINIT)
+#endif
+#if defined(NV_PCI_EPC_EVENT_OPS_STRUCT_HAS_EPC_DEINIT) /* Linux v6.11 */
+	.epc_deinit = tvnet_ep_pci_epf_epc_deinit,
+#elif defined(NV_PCI_EPC_EVENT_OPS_STRUCT_HAS_CORE_DEINIT) /* Nvidia Internal */
 	.core_deinit = tvnet_ep_pci_epf_core_deinit,
 #endif
 	.link_up = tvnet_ep_pci_epf_linkup,

scripts/conftest/Makefile

@@ -152,6 +152,8 @@ NV_CONFTEST_FUNCTION_COMPILE_TESTS += pci_enable_pcie_error_reporting
 NV_CONFTEST_FUNCTION_COMPILE_TESTS += pci_epf_alloc_space_has_epc_features_arg
 NV_CONFTEST_FUNCTION_COMPILE_TESTS += pci_epf_driver_struct_probe_has_id_arg
 NV_CONFTEST_FUNCTION_COMPILE_TESTS += pci_epc_event_ops_struct_has_core_deinit
+NV_CONFTEST_FUNCTION_COMPILE_TESTS += pci_epc_event_ops_struct_has_epc_deinit
+NV_CONFTEST_FUNCTION_COMPILE_TESTS += pci_epc_event_ops_struct_has_epc_init
 NV_CONFTEST_FUNCTION_COMPILE_TESTS += pci_epc_irq_type_enum_present
 NV_CONFTEST_FUNCTION_COMPILE_TESTS += platform_driver_struct_remove_returns_void
 NV_CONFTEST_FUNCTION_COMPILE_TESTS += register_shrinker_has_fmt_arg

scripts/conftest/conftest.sh

@@ -7554,6 +7554,39 @@ compile_test() {
             compile_check_conftest "$CODE" "NV_PCI_EPC_EVENT_OPS_STRUCT_HAS_CORE_DEINIT" "" "types"
         ;;
 
+        pci_epc_event_ops_struct_has_epc_deinit)
+            #
+            # Determine if the pci_epc_event_ops struct has the epc_deinit function.
+            #
+            # Commit 473b2cf9c4d1 ("PCI: endpoint: Introduce 'epc_deinit' event and
+            # notify the EPF drivers) added 'epc_deinit' callback in Linux v6.11.
+            #
+            CODE="
+            #include <linux/pci-epf.h>
+            int conftest_pci_epc_event_ops_struct_has_epc_deinit(void) {
+                return offsetof(struct pci_epc_event_ops, epc_deinit);
+            }"
+
+            compile_check_conftest "$CODE" "NV_PCI_EPC_EVENT_OPS_STRUCT_HAS_EPC_DEINIT" "" "types"
+        ;;
+
+        pci_epc_event_ops_struct_has_epc_init)
+            #
+            # Determine if the pci_epc_event_ops struct has the epc_init function.
+            #
+            # Commit 4edd7dc82bd6 ("PCI: endpoint: Rename core_init() callback in
+            # 'struct pci_epc_event_ops' to epc_init()") renamed core_init()
+            # in Linux v6.11.
+            #
+            CODE="
+            #include <linux/pci-epf.h>
+            int conftest_pci_epc_event_ops_struct_has_epc_init(void) {
+                return offsetof(struct pci_epc_event_ops, epc_init);
+            }"
+
+            compile_check_conftest "$CODE" "NV_PCI_EPC_EVENT_OPS_STRUCT_HAS_EPC_INIT" "" "types"
+        ;;
+
         platform_driver_struct_remove_returns_void)
             #
             # Determine if the 'platform_driver' structure 'remove' function