gpu: host1x: Improve debug disassembly formatting

The host1x driver prints out "disassembly" dumps of the command FIFO
and gather contents on submission timeouts. However, the output has
been quite difficult to read with unnecessary newlines and occasional
missing parentheses.

Fix these problems by using pr_cont to remove unnecessary newlines
and by fixing other small issues.

Signed-off-by: Mikko Perttunen <mperttunen@nvidia.com>
Reviewed-by: Dmitry Osipenko <digetx@gmail.com>
Tested-by: Dmitry Osipenko <digetx@gmail.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>

5 files changed, 61 insertions, 30 deletions

diff --git a/drivers/gpu/host1x/debug.c b/drivers/gpu/host1x/debug.c
index 2aae0e63214c..dc77ec452ffc 100644
--- a/drivers/gpu/host1x/debug.c
+++ b/drivers/gpu/host1x/debug.c
@@ -40,7 +40,19 @@ void host1x_debug_output(struct output *o, const char *fmt, ...)
         len = vsnprintf(o->buf, sizeof(o->buf), fmt, args);
         va_end(args);
 
-        o->fn(o->ctx, o->buf, len);
+        o->fn(o->ctx, o->buf, len, false);
+}
+
+void host1x_debug_cont(struct output *o, const char *fmt, ...)
+{
+        va_list args;
+        int len;
+
+        va_start(args, fmt);
+        len = vsnprintf(o->buf, sizeof(o->buf), fmt, args);
+        va_end(args);
+
+        o->fn(o->ctx, o->buf, len, true);
 }
 
 static int show_channel(struct host1x_channel *ch, void *data, bool show_fifo)
diff --git a/drivers/gpu/host1x/debug.h b/drivers/gpu/host1x/debug.h
index 4595b2e0799f..990cce47e737 100644
--- a/drivers/gpu/host1x/debug.h
+++ b/drivers/gpu/host1x/debug.h
@@ -24,22 +24,28 @@
 struct host1x;
 
 struct output {
-        void (*fn)(void *ctx, const char *str, size_t len);
+        void (*fn)(void *ctx, const char *str, size_t len, bool cont);
         void *ctx;
         char buf[256];
 };
 
-static inline void write_to_seqfile(void *ctx, const char *str, size_t len)
+static inline void write_to_seqfile(void *ctx, const char *str, size_t len,
+                                    bool cont)
 {
         seq_write((struct seq_file *)ctx, str, len);
 }
 
-static inline void write_to_printk(void *ctx, const char *str, size_t len)
+static inline void write_to_printk(void *ctx, const char *str, size_t len,
+                                   bool cont)
 {
-        pr_info("%s", str);
+        if (cont)
+                pr_cont("%s", str);
+        else
+                pr_info("%s", str);
 }
 
 void __printf(2, 3) host1x_debug_output(struct output *o, const char *fmt, ...);
+void __printf(2, 3) host1x_debug_cont(struct output *o, const char *fmt, ...);
 
 extern unsigned int host1x_debug_trace_cmdbuf;
 
diff --git a/drivers/gpu/host1x/hw/debug_hw.c b/drivers/gpu/host1x/hw/debug_hw.c
index 770d92e62d69..1e67667e308c 100644
--- a/drivers/gpu/host1x/hw/debug_hw.c
+++ b/drivers/gpu/host1x/hw/debug_hw.c
@@ -40,48 +40,59 @@ enum {
 
 static unsigned int show_channel_command(struct output *o, u32 val)
 {
-        unsigned int mask, subop;
+        unsigned int mask, subop, num;
 
         switch (val >> 28) {
         case HOST1X_OPCODE_SETCLASS:
                 mask = val & 0x3f;
                 if (mask) {
-                        host1x_debug_output(o, "SETCL(class=%03x, offset=%03x, mask=%02x, [",
+                        host1x_debug_cont(o, "SETCL(class=%03x, offset=%03x, mask=%02x, [",
                                             val >> 6 & 0x3ff,
                                             val >> 16 & 0xfff, mask);
                         return hweight8(mask);
                 }
 
-                host1x_debug_output(o, "SETCL(class=%03x)\n", val >> 6 & 0x3ff);
+                host1x_debug_cont(o, "SETCL(class=%03x)\n", val >> 6 & 0x3ff);
                 return 0;
 
         case HOST1X_OPCODE_INCR:
-                host1x_debug_output(o, "INCR(offset=%03x, [",
+                num = val & 0xffff;
+                host1x_debug_cont(o, "INCR(offset=%03x, [",
                                     val >> 16 & 0xfff);
-                return val & 0xffff;
+                if (!num)
+                        host1x_debug_cont(o, "])\n");
+
+                return num;
 
         case HOST1X_OPCODE_NONINCR:
-                host1x_debug_output(o, "NONINCR(offset=%03x, [",
+                num = val & 0xffff;
+                host1x_debug_cont(o, "NONINCR(offset=%03x, [",
                                     val >> 16 & 0xfff);
-                return val & 0xffff;
+                if (!num)
+                        host1x_debug_cont(o, "])\n");
+
+                return num;
 
         case HOST1X_OPCODE_MASK:
                 mask = val & 0xffff;
-                host1x_debug_output(o, "MASK(offset=%03x, mask=%03x, [",
+                host1x_debug_cont(o, "MASK(offset=%03x, mask=%03x, [",
                                     val >> 16 & 0xfff, mask);
+                if (!mask)
+                        host1x_debug_cont(o, "])\n");
+
                 return hweight16(mask);
 
         case HOST1X_OPCODE_IMM:
-                host1x_debug_output(o, "IMM(offset=%03x, data=%03x)\n",
+                host1x_debug_cont(o, "IMM(offset=%03x, data=%03x)\n",
                                     val >> 16 & 0xfff, val & 0xffff);
                 return 0;
 
         case HOST1X_OPCODE_RESTART:
-                host1x_debug_output(o, "RESTART(offset=%08x)\n", val << 4);
+                host1x_debug_cont(o, "RESTART(offset=%08x)\n", val << 4);
                 return 0;
 
         case HOST1X_OPCODE_GATHER:
-                host1x_debug_output(o, "GATHER(offset=%03x, insert=%d, type=%d, count=%04x, addr=[",
+                host1x_debug_cont(o, "GATHER(offset=%03x, insert=%d, type=%d, count=%04x, addr=[",
                                     val >> 16 & 0xfff, val >> 15 & 0x1,
                                     val >> 14 & 0x1, val & 0x3fff);
                 return 1;
@@ -89,16 +100,17 @@ static unsigned int show_channel_command(struct output *o, u32 val)
         case HOST1X_OPCODE_EXTEND:
                 subop = val >> 24 & 0xf;
                 if (subop == HOST1X_OPCODE_EXTEND_ACQUIRE_MLOCK)
-                        host1x_debug_output(o, "ACQUIRE_MLOCK(index=%d)\n",
+                        host1x_debug_cont(o, "ACQUIRE_MLOCK(index=%d)\n",
                                             val & 0xff);
                 else if (subop == HOST1X_OPCODE_EXTEND_RELEASE_MLOCK)
-                        host1x_debug_output(o, "RELEASE_MLOCK(index=%d)\n",
+                        host1x_debug_cont(o, "RELEASE_MLOCK(index=%d)\n",
                                             val & 0xff);
                 else
-                        host1x_debug_output(o, "EXTEND_UNKNOWN(%08x)\n", val);
+                        host1x_debug_cont(o, "EXTEND_UNKNOWN(%08x)\n", val);
                 return 0;
 
         default:
+                host1x_debug_cont(o, "UNKNOWN\n");
                 return 0;
         }
 }
@@ -126,11 +138,11 @@ static void show_gather(struct output *o, phys_addr_t phys_addr,
                 u32 val = *(map_addr + offset / 4 + i);
 
                 if (!data_count) {
-                        host1x_debug_output(o, "%08x: %08x:", addr, val);
+                        host1x_debug_output(o, "%08x: %08x: ", addr, val);
                         data_count = show_channel_command(o, val);
                 } else {
-                        host1x_debug_output(o, "%08x%s", val,
-                                            data_count > 0 ? ", " : "])\n");
+                        host1x_debug_cont(o, "%08x%s", val,
+                                            data_count > 1 ? ", " : "])\n");
                         data_count--;
                 }
         }
diff --git a/drivers/gpu/host1x/hw/debug_hw_1x01.c b/drivers/gpu/host1x/hw/debug_hw_1x01.c
index 8f243903cc7f..09e1aa7bb5dd 100644
--- a/drivers/gpu/host1x/hw/debug_hw_1x01.c
+++ b/drivers/gpu/host1x/hw/debug_hw_1x01.c
@@ -111,11 +111,11 @@ static void host1x_debug_show_channel_fifo(struct host1x *host,
                 val = host1x_sync_readl(host, HOST1X_SYNC_CFPEEK_READ);
 
                 if (!data_count) {
-                        host1x_debug_output(o, "%08x:", val);
+                        host1x_debug_output(o, "%08x: ", val);
                         data_count = show_channel_command(o, val);
                 } else {
-                        host1x_debug_output(o, "%08x%s", val,
-                                            data_count > 0 ? ", " : "])\n");
+                        host1x_debug_cont(o, "%08x%s", val,
+                                          data_count > 1 ? ", " : "])\n");
                         data_count--;
                 }
 
@@ -126,7 +126,7 @@ static void host1x_debug_show_channel_fifo(struct host1x *host,
         } while (rd_ptr != wr_ptr);
 
         if (data_count)
-                host1x_debug_output(o, ", ...])\n");
+                host1x_debug_cont(o, ", ...])\n");
         host1x_debug_output(o, "\n");
 
         host1x_sync_writel(host, 0x0, HOST1X_SYNC_CFPEEK_CTRL);
diff --git a/drivers/gpu/host1x/hw/debug_hw_1x06.c b/drivers/gpu/host1x/hw/debug_hw_1x06.c
index 9cdee657fb46..bd89da5dc64c 100644
--- a/drivers/gpu/host1x/hw/debug_hw_1x06.c
+++ b/drivers/gpu/host1x/hw/debug_hw_1x06.c
@@ -105,11 +105,12 @@ static void host1x_debug_show_channel_fifo(struct host1x *host,
                                               HOST1X_HV_CMDFIFO_PEEK_READ);
 
                 if (!data_count) {
-                        host1x_debug_output(o, "%08x:", val);
+                        host1x_debug_output(o, "%03x 0x%08x: ",
+                                            rd_ptr - start, val);
                         data_count = show_channel_command(o, val);
                 } else {
-                        host1x_debug_output(o, "%08x%s", val,
-                                            data_count > 0 ? ", " : "])\n");
+                        host1x_debug_cont(o, "%08x%s", val,
+                                          data_count > 1 ? ", " : "])\n");
                         data_count--;
                 }
 
@@ -120,7 +121,7 @@ static void host1x_debug_show_channel_fifo(struct host1x *host,
         } while (rd_ptr != wr_ptr);
 
         if (data_count)
-                host1x_debug_output(o, ", ...])\n");
+                host1x_debug_cont(o, ", ...])\n");
         host1x_debug_output(o, "\n");
 
         host1x_hypervisor_writel(host, 0x0, HOST1X_HV_CMDFIFO_PEEK_CTRL);