Open source GPL/LGPL release

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

@@ -0,0 +1,138 @@
+/*
+ * Copyright (c) 2017-2021, 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/kernel.h>
+#include <linux/device.h>
+
+#include <nvgpu/linux/log.h>
+#include <nvgpu/gk20a.h>
+
+#include "platform_gk20a.h"
+#include "os_linux.h"
+
+/*
+ * Define a length for log buffers. This is the buffer that the 'fmt, ...' part
+ * of __nvgpu_do_log_print() prints into. This buffer lives on the stack so it
+ * needs to not be overly sized since we have limited kernel stack space. But at
+ * the same time we don't want it to be restrictive either.
+ */
+#define LOG_BUFFER_LENGTH	160
+
+/*
+ * Annoying quirk of Linux: this has to be a string literal since the printk()
+ * function and friends use the preprocessor to concatenate stuff to the start
+ * of this string when printing.
+ */
+#define LOG_FMT			"nvgpu: %s %33s:%-4d [%s]  %s\n"
+
+static const char *log_types[] = {
+	"ERR",
+	"WRN",
+	"DBG",
+	"INFO",
+};
+
+static inline const char *nvgpu_log_name(struct gk20a *g)
+{
+	return dev_from_gk20a(g) == NULL ? "" : dev_name(dev_from_gk20a(g));
+}
+
+#ifdef CONFIG_GK20A_TRACE_PRINTK
+static void __nvgpu_trace_printk_log(u32 trace, const char *gpu_name,
+				     const char *func_name, int line,
+				     const char *log_type, const char *log)
+{
+	trace_printk(LOG_FMT, gpu_name, func_name, line, log_type, log);
+}
+#endif
+
+static void __nvgpu_really_print_log(u32 trace, const char *gpu_name,
+				     const char *func_name, int line,
+				     enum nvgpu_log_type type, const char *log)
+{
+	const char *name = gpu_name ? gpu_name : "";
+	const char *log_type = log_types[type];
+
+#ifdef CONFIG_GK20A_TRACE_PRINTK
+	if (trace)
+		return __nvgpu_trace_printk_log(trace, name, func_name,
+						line, log_type, log);
+#endif
+	switch (type) {
+	case NVGPU_DEBUG:
+		/*
+		 * We could use pr_debug() here but we control debug enablement
+		 * separately from the Linux kernel. Perhaps this is a bug in
+		 * nvgpu.
+		 */
+		pr_info(LOG_FMT, name, func_name, line, log_type, log);
+		break;
+	case NVGPU_INFO:
+		pr_info(LOG_FMT, name, func_name, line, log_type, log);
+		break;
+	case NVGPU_WARNING:
+		pr_warn(LOG_FMT, name, func_name, line, log_type, log);
+		break;
+	case NVGPU_ERROR:
+		pr_err(LOG_FMT, name, func_name, line, log_type, log);
+		break;
+	default:
+		break;
+	}
+}
+
+__attribute__((format (printf, 5, 6)))
+void nvgpu_log_msg_impl(struct gk20a *g, const char *func_name, int line,
+			enum nvgpu_log_type type, const char *fmt, ...)
+{
+	char log[LOG_BUFFER_LENGTH];
+	va_list args;
+
+	va_start(args, fmt);
+	(void) vsnprintf(log, LOG_BUFFER_LENGTH, fmt, args);
+	va_end(args);
+
+	__nvgpu_really_print_log(0, g ? nvgpu_log_name(g) : "",
+				 func_name, line, type, log);
+}
+
+__attribute__((format (printf, 5, 6)))
+void nvgpu_log_dbg_impl(struct gk20a *g, u64 log_mask,
+			const char *func_name, int line,
+			const char *fmt, ...)
+{
+	char log[LOG_BUFFER_LENGTH];
+	va_list args;
+
+	if ((log_mask & g->log_mask) == 0)
+		return;
+
+	va_start(args, fmt);
+	(void) vsnprintf(log, LOG_BUFFER_LENGTH, fmt, args);
+	va_end(args);
+
+	__nvgpu_really_print_log(g->log_trace, g ? nvgpu_log_name(g) : "",
+				 func_name, line, NVGPU_DEBUG, log);
+}
+
+void nvgpu_dbg_dump_impl(struct gk20a *g, const char *str)
+{
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 14, 0)
+	pr_err("__%s__ %s", g->name, str);
+#else
+	pr_err("__%s__ %s\n", g->name, str);
+#endif
+}