gpu: nvgpu: allocate from coherent pool

Maps memory coherently on devices that are connected to a coherent bus.

(1) Add code to be able to get the platform device node.
(2) Create a new flag to mark if the device is connected to a coherent bus
(3) Map memory coherently on coherent devices.

bug 2040331

Change-Id: Ide83a9261acdbbc6e9fef4fc5f38d6f9d0e5ab5b
Signed-off-by: David Nieto <dmartineznie@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/1633985
Reviewed-by: svc-mobile-coverity <svc-mobile-coverity@nvidia.com>
Reviewed-by: Alex Waterman <alexw@nvidia.com>
GVS: Gerrit_Virtual_Submit
Reviewed-by: Terje Bergstrom <tbergstrom@nvidia.com>
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>

1 files changed, 20 insertions, 1 deletions

diff --git a/drivers/gpu/nvgpu/common/linux/module.c b/drivers/gpu/nvgpu/common/linux/module.c
index 4fe38588..5d91da8f 100644
--- a/drivers/gpu/nvgpu/common/linux/module.c
+++ b/drivers/gpu/nvgpu/common/linux/module.c
@@ -24,6 +24,8 @@
 #include <linux/pm_runtime.h>
 #include <linux/reset.h>
 #include <linux/platform/tegra/common.h>
+#include <linux/pci.h>
+
 #include <uapi/linux/nvgpu.h>
 #include <dt-bindings/soc/gm20b-fuse.h>
 #include <dt-bindings/soc/gp10b-fuse.h>
@@ -70,6 +72,23 @@
 #define CREATE_TRACE_POINTS
 #include <trace/events/gk20a.h>
 
+
+struct device_node *nvgpu_get_node(struct gk20a *g)
+{
+        struct device *dev = dev_from_gk20a(g);
+
+        if (dev_is_pci(dev)) {
+                struct pci_bus *bus = to_pci_dev(dev)->bus;
+
+                while (!pci_is_root_bus(bus))
+                        bus = bus->parent;
+
+                return bus->bridge->parent->of_node;
+        }
+
+        return dev->of_node;
+}
+
 void gk20a_busy_noresume(struct gk20a *g)
 {
         pm_runtime_get_noresume(dev_from_gk20a(g));
@@ -1042,7 +1061,7 @@ static inline void set_gk20a(struct platform_device *pdev, struct gk20a *gk20a)
 
 static int nvgpu_read_fuse_overrides(struct gk20a *g)
 {
-        struct device_node *np = dev_from_gk20a(g)->of_node;
+        struct device_node *np = nvgpu_get_node(g);
         u32 *fuses;
         int count, i;