nvlink: add support for kernel tests

Add support for NVLINK kernel test modules:
   - Create an NVLINK tests debugfs directory which will be used as the
     parent directory for all test related debugfs nodes
   - Export NVLINK logging APIs
        - Rename the NVLINK_DRV_NAME macros to NVLINK_MODULE_NAME. This
          was done because now the NVLINK logging APIs are being used by
          non-driver modules (i.e. tests) as well.
   - Export an ARM64 cache flush API - this API is needed by the Tegra
     loopback test

Bug 2133882
Jira NVLINK-107

Change-Id: I587b704ff44327ee4d9767156cb87cbe27408e08
Signed-off-by: Adeel Raza <araza@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/1704230
Reviewed-by: svc-mobile-coverity <svc-mobile-coverity@nvidia.com>
Reviewed-by: Automatic_Commit_Validation_User
Reviewed-by: Krishna Reddy <vdumpa@nvidia.com>
Reviewed-by: Petlozu Pravareshwar <petlozup@nvidia.com>
GVS: Gerrit_Virtual_Submit
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>

1 files changed, 6 insertions, 2 deletions

diff --git a/include/linux/platform/tegra/tegra-nvlink.h b/include/linux/platform/tegra/tegra-nvlink.h
index 09798b293..7760837eb 100644
--- a/include/linux/platform/tegra/tegra-nvlink.h
+++ b/include/linux/platform/tegra/tegra-nvlink.h
@@ -45,7 +45,10 @@ enum nvlink_log_categories {
 
 #ifdef CONFIG_DEBUG_FS
 /* This is the root debugfs directory for the entire NVLINK driver stack */
-extern struct dentry *nvlink_debugfs;
+extern struct dentry *nvlink_debugfs_root;
+
+/* This is the parent debugfs directory for NVLINK tests */
+extern struct dentry *nvlink_debugfs_tests;
 #endif /* CONFIG_DEBUG_FS */
 
 extern u32 nvlink_log_mask;
@@ -55,7 +58,7 @@ extern u32 nvlink_log_mask;
         do {                                            \
                 if ((log_mask) & nvlink_log_mask)       \
                         printk("%s: %s: %d: " fmt "\n", \
-                                NVLINK_DRV_NAME,        \
+                                NVLINK_MODULE_NAME,     \
                                 __func__,               \
                                 __LINE__,               \
                                 ##arg);                 \
@@ -298,6 +301,7 @@ struct nvlink_device {
 
 /* APIs used by endpoint drivers for interfacing with the core driver */
 void nvlink_print_topology(void);
+void __nvlink_dma_flush_area(const void *ptr, size_t size);
 int nvlink_register_device(struct nvlink_device* device);
 int nvlink_register_link(struct nvlink_link* link);
 int nvlink_unregister_device(struct nvlink_device* device);