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, 8 insertions, 0 deletions

diff --git a/drivers/gpu/nvgpu/common/linux/pci.c b/drivers/gpu/nvgpu/common/linux/pci.c
index 23604633..7c853b14 100644
--- a/drivers/gpu/nvgpu/common/linux/pci.c
+++ b/drivers/gpu/nvgpu/common/linux/pci.c
@@ -21,6 +21,8 @@
 #include <nvgpu/nvgpu_common.h>
 #include <nvgpu/kmem.h>
 #include <nvgpu/enabled.h>
+#include <linux/of_platform.h>
+#include <linux/of_address.h>
 
 #include "gk20a/gk20a.h"
 #include "clk/clk.h"
@@ -525,6 +527,7 @@ static int nvgpu_pci_probe(struct pci_dev *pdev,
         struct gk20a *g;
         int err;
         char nodefmt[64];
+        struct device_node *np;
 
         /* make sure driver_data is a sane index */
         if (pent->driver_data >= sizeof(nvgpu_pci_device) /
@@ -632,6 +635,11 @@ static int nvgpu_pci_probe(struct pci_dev *pdev,
 
         g->mm.has_physical_mode = false;
 
+        np = nvgpu_get_node(g);
+
+        if (of_dma_is_coherent(np))
+                __nvgpu_set_enabled(g, NVGPU_DMA_COHERENT, true);
+
         return 0;
 }