Open source GPL/LGPL release

drivers/gpu/nvgpu/os/linux/firmware.c

@@ -0,0 +1,118 @@
+/*
+ * Copyright (c) 2017-2019, NVIDIA CORPORATION.  All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/firmware.h>
+
+#include <nvgpu/kmem.h>
+#include <nvgpu/bug.h>
+#include <nvgpu/firmware.h>
+#include <nvgpu/gk20a.h>
+#include <nvgpu/string.h>
+
+#include "platform_gk20a.h"
+#include "os_linux.h"
+
+static const struct firmware *do_request_firmware(struct device *dev,
+		const char *prefix, const char *fw_name, u32 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 = nvgpu_kzalloc(get_gk20a(dev),
+					sizeof(*fw_path) * path_len);
+		if (!fw_path)
+			return NULL;
+
+		(void) sprintf(fw_path, "%s/%s", prefix, fw_name);
+		fw_name = fw_path;
+	}
+
+	if (flags & NVGPU_REQUEST_FIRMWARE_NO_WARN)
+		err = request_firmware_direct(&fw, fw_name, dev);
+	else
+		err = request_firmware(&fw, fw_name, dev);
+
+	nvgpu_kfree(get_gk20a(dev), 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 nvgpu_release_firmware later. */
+struct nvgpu_firmware *nvgpu_request_firmware(struct gk20a *g,
+					      const char *fw_name,
+					      u32 flags)
+{
+	struct device *dev = dev_from_gk20a(g);
+	struct nvgpu_firmware *fw;
+	const struct firmware *linux_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;
+
+	fw = nvgpu_kzalloc(g, sizeof(*fw));
+	if (!fw)
+		return NULL;
+
+	linux_fw = do_request_firmware(dev, g->name, fw_name, flags);
+
+#ifdef CONFIG_TEGRA_GK20A
+	/* TO BE REMOVED - Support loading from legacy SOC specific path. */
+	if (!linux_fw && !(flags & NVGPU_REQUEST_FIRMWARE_NO_SOC)) {
+		struct gk20a_platform *platform = gk20a_get_platform(dev);
+		linux_fw = do_request_firmware(dev,
+				platform->soc_name, fw_name, flags);
+	}
+#endif
+
+	if (!linux_fw)
+		goto err;
+
+	fw->data = nvgpu_kmalloc(g, linux_fw->size);
+	if (!fw->data)
+		goto err_release;
+
+	nvgpu_memcpy((u8 *)fw->data, (u8 *)linux_fw->data, linux_fw->size);
+	fw->size = linux_fw->size;
+
+	release_firmware(linux_fw);
+
+	return fw;
+
+err_release:
+	release_firmware(linux_fw);
+err:
+	nvgpu_kfree(g, fw);
+	return NULL;
+}
+
+void nvgpu_release_firmware(struct gk20a *g, struct nvgpu_firmware *fw)
+{
+	if(!fw)
+		return;
+
+	nvgpu_kfree(g, fw->data);
+	nvgpu_kfree(g, fw);
+}