gpu: nvgpu: Suppress error msg from VBIOS overlay

Suppress error message when nvgpu tries to load VBIOS overlay, but
one is not found. This situation is normal. This is done by moving
gk20a_request_firmware() to be nvgpu generic function
nvgpu_request_firmware(), and adding a NO_WARN flag to it.

Introduce also a NO_SOC flag to suppress attempt to load firmware
from SoC specific directory in addition to the chip specific
directory. Use it for dGPU firmware files.

Bug 200236777

Change-Id: I0294d3308f029a6a6d3c2effa579d5f69a91e418
Signed-off-by: Terje Bergstrom <tbergstrom@nvidia.com>
Reviewed-on: http://git-master/r/1223840
(cherry picked from commit cca44c3f010f15918cdd2259c15170ba1917828a)
Reviewed-on: http://git-master/r/1233353
GVS: Gerrit_Virtual_Submit

1 files changed, 67 insertions, 0 deletions

diff --git a/drivers/gpu/nvgpu/nvgpu_common.c b/drivers/gpu/nvgpu/nvgpu_common.c
index bdc07e50..fac818a2 100644
--- a/drivers/gpu/nvgpu/nvgpu_common.c
+++ b/drivers/gpu/nvgpu/nvgpu_common.c
@@ -15,9 +15,11 @@
  */
 
 #include <linux/dma-mapping.h>
+#include <linux/firmware.h>
 
 #include "gk20a/gk20a_scale.h"
 #include "gk20a/gk20a.h"
+#include "nvgpu_common.h"
 
 #define EMC3D_DEFAULT_RATIO 750
 
@@ -152,3 +154,68 @@ int nvgpu_probe(struct gk20a *g,
 
         return 0;
 }
+
+static const struct firmware *do_request_firmware(struct device *dev,
+                const char *prefix, const char *fw_name, int flags)
+{
+        const struct firmware *fw;
+        char *fw_path = NULL;
+        int path_len, err;
+
+        if (prefix) {
+                path_len = strlen(prefix) + strlen(fw_name);
+                path_len += 2; /* for the path separator and zero terminator*/
+
+                fw_path = kzalloc(sizeof(*fw_path) * path_len, GFP_KERNEL);
+                if (!fw_path)
+                        return NULL;
+
+                sprintf(fw_path, "%s/%s", prefix, fw_name);
+                fw_name = fw_path;
+        }
+
+#if LINUX_VERSION_CODE < KERNEL_VERSION(3,18,0)
+        err = request_firmware(&fw, fw_name, dev);
+#else
+        if (flags & NVGPU_REQUEST_FIRMWARE_NO_WARN)
+                err = request_firmware_direct(&fw, fw_name, dev);
+        else
+                err = request_firmware(&fw, fw_name, dev);
+#endif
+
+        kfree(fw_path);
+        if (err)
+                return NULL;
+        return fw;
+}
+
+/* This is a simple wrapper around request_firmware that takes 'fw_name' and
+ * applies an IP specific relative path prefix to it. The caller is
+ * responsible for calling release_firmware later. */
+const struct firmware *nvgpu_request_firmware(struct gk20a *g,
+                                              const char *fw_name,
+                                              int flags)
+{
+        struct device *dev = g->dev;
+        const struct firmware *fw;
+
+        /* current->fs is NULL when calling from SYS_EXIT.
+           Add a check here to prevent crash in request_firmware */
+        if (!current->fs || !fw_name)
+                return NULL;
+
+        BUG_ON(!g->ops.name);
+        fw = do_request_firmware(dev, g->ops.name, fw_name, flags);
+
+#ifdef CONFIG_TEGRA_GK20A
+        /* TO BE REMOVED - Support loading from legacy SOC specific path. */
+        if (!fw && !(flags & NVGPU_REQUEST_FIRMWARE_NO_SOC)) {
+                struct gk20a_platform *platform = gk20a_get_platform(dev);
+                fw = do_request_firmware(dev,
+                                platform->soc_name, fw_name, flags);
+        }
+#endif
+
+        return fw;
+}
+