gpu: nvgpu: Initial Nvlink driver skeleton

Adds the skeleton and integration of the GV100 endpoint driver to NVGPU

(1) Adds a OS abstraction layer for the internal nvlink structure.
(2) Adds linux specific integration with Nvlink core driver.
(3) Adds function pointers for nvlink api, initialization and isr process.
(4) Adds initial support for minion.
(5) Adds new GPU enable properties to handle NVLINK presence
(6) Adds new GPU enable properties for SG_PHY bypass (required for NVLINK over
PCI)
(7) Adds parsing of nvlink vbios structures.
(8) Adds logging defines for NVGPU

JIRA: EVLR-2328

Change-Id: I0720a165a15c7187892c8c1a0662ec598354ac06
Signed-off-by: David Nieto <dmartineznie@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/1644708
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>

1 files changed, 13 insertions, 0 deletions

diff --git a/drivers/gpu/nvgpu/common/linux/pci.c b/drivers/gpu/nvgpu/common/linux/pci.c
index 9c18fbc9..905a3d39 100644
--- a/drivers/gpu/nvgpu/common/linux/pci.c
+++ b/drivers/gpu/nvgpu/common/linux/pci.c
@@ -21,6 +21,7 @@
 #include <nvgpu/nvgpu_common.h>
 #include <nvgpu/kmem.h>
 #include <nvgpu/enabled.h>
+#include <nvgpu/nvlink.h>
 #include <linux/of_platform.h>
 #include <linux/of_address.h>
 
@@ -629,6 +630,18 @@ static int nvgpu_pci_probe(struct pci_dev *pdev,
                 return err;
         }
 
+        err = nvgpu_nvlink_probe(g);
+        /*
+         * ENODEV is a legal error which means there is no NVLINK
+         * any other error is fatal
+         */
+        if (err) {
+                if (err != -ENODEV) {
+                        nvgpu_err(g, "fatal error probing nvlink, bailing out");
+                        return err;
+                }
+        }
+
         g->mm.has_physical_mode = false;
 
         np = nvgpu_get_node(g);