1 files changed, 130 insertions, 0 deletions

diff --git a/drivers/gpu/nvgpu/common/linux/log.c b/drivers/gpu/nvgpu/common/linux/log.c
new file mode 100644
index 00000000..9dd965ec
--- /dev/null
+++ b/drivers/gpu/nvgpu/common/linux/log.c
@@ -0,0 +1,130 @@
+/*
+ * Copyright (c) 2017, 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/log.h>
+
+#include "gk20a/gk20a.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"
+
+u32 nvgpu_dbg_mask = NVGPU_DEFAULT_DBG_MASK;
+
+static const char *log_types[] = {
+        "ERR",
+        "WRN",
+        "DBG"
+};
+
+int nvgpu_log_mask_enabled(struct gk20a *g, u32 log_mask)
+{
+        return !!(g->log_mask & log_mask);
+}
+
+static inline const char *nvgpu_log_name(struct gk20a *g)
+{
+        return dev_name(g->dev);
+}
+
+#ifdef CONFIG_GK20A_TRACE_PRINTK
+static void __nvgpu_trace_printk_log(u32 trace, const char *gpu_name,
+                                     const char *func_name, int line,
+                                     enum nvgpu_log_type type, const char *log)
+{
+        trace_printk(LOG_FMT, gpu_name, func_name, line, 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 : "";
+
+#ifdef CONFIG_GK20A_TRACE_PRINTK
+        if (trace)
+                return __nvgpu_trace_printk_log(trace, name, func_name,
+                                                line, type, log);
+#else
+        const char *log_type = log_types[type];
+
+        switch (type) {
+        case 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 WARNING:
+                pr_warn(LOG_FMT, name, func_name, line, log_type, log);
+                break;
+        case ERROR:
+                pr_err(LOG_FMT, name, func_name, line, log_type, log);
+                break;
+        }
+#endif
+}
+
+__attribute__((format (printf, 5, 6)))
+void __nvgpu_log_msg(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);
+        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(struct gk20a *g, u32 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);
+        vsnprintf(log, LOG_BUFFER_LENGTH, fmt, args);
+        va_end(args);
+
+        __nvgpu_really_print_log(g->log_trace, nvgpu_log_name(g),
+                                 func_name, line, DEBUG, log);
+}