gpu: nvgpu: Use tegra_alloc_fd() only on Tegra kernel

tegra_alloc_fd() exists only in Tegra kernel. Use get_unused_fd_flags()
in other platforms.

JIRA NVGPU-4

Change-Id: I12b16957263f6cea771314a9da229384c865e65f
Signed-off-by: Terje Bergstrom <tbergstrom@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/1689538
Reviewed-by: svc-mobile-coverity <svc-mobile-coverity@nvidia.com>
GVS: Gerrit_Virtual_Submit
Reviewed-by: Alex Waterman <alexw@nvidia.com>
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>

2 files changed, 17 insertions, 0 deletions

diff --git a/drivers/gpu/nvgpu/Kconfig b/drivers/gpu/nvgpu/Kconfig
index ca1db973..ac0fa261 100644
--- a/drivers/gpu/nvgpu/Kconfig
+++ b/drivers/gpu/nvgpu/Kconfig
@@ -135,3 +135,14 @@ config NVGPU_SUPPORT_CDE
         default y
         help
           Enable support for extraction of comptags for CDE.
+
+config NVGPU_USE_TEGRA_ALLOC_FD
+        bool "Use tegra_alloc_fd() for allocating dma_buf fds for vidmem"
+        depends on GK20A && GK20A_VIDMEM
+        default y
+        help
+          Use tegra_alloc_fd() for allocating dma_buf fds. This allocates
+          the fds above 1024 which exempts them from counting against process
+          fd limit.
+
+          It is only available in Tegra kernel.
diff --git a/drivers/gpu/nvgpu/common/linux/vidmem.c b/drivers/gpu/nvgpu/common/linux/vidmem.c
index 684262ba..136d4a10 100644
--- a/drivers/gpu/nvgpu/common/linux/vidmem.c
+++ b/drivers/gpu/nvgpu/common/linux/vidmem.c
@@ -17,7 +17,9 @@
 #include <linux/dma-buf.h>
 #include <uapi/linux/nvgpu.h>
 
+#ifdef CONFIG_NVGPU_USE_TEGRA_ALLOC_FD
 #include <linux/platform/tegra/tegra_fd.h>
+#endif
 
 #include <nvgpu/dma.h>
 #include <nvgpu/enabled.h>
@@ -195,7 +197,11 @@ int nvgpu_vidmem_export_linux(struct gk20a *g, size_t bytes)
 
         buf->priv = priv;
 
+#ifdef CONFIG_NVGPU_USE_TEGRA_ALLOC_FD
         fd = tegra_alloc_fd(current->files, 1024, O_RDWR);
+#else
+        fd = get_unused_fd_flags(O_RDWR);
+#endif
         if (fd < 0) {
                 /* ->release frees what we have done */
                 dma_buf_put(priv->dmabuf);