bus: omap_l3_noc: add information about the type of operation

Today we get error such as
L3 Custom Error: MASTER MPU TARGET L4PER2

But since the actual instruction triggerring the error Vs the point
at which we report error may not be aligned, it makes sense to try
and provide additional information - example the type of operation
that was attempted to being performed can help narrow the debug down
further.

This helps provide log such as:
L3 Custom Error: MASTER MPU TARGET L4PER2 (Read)

Signed-off-by: Nishanth Menon <nm@ti.com>
Acked-by: Santosh Shilimkar <santosh.shilimkar@ti.com>
Acked-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Tested-by: Darren Etheridge <detheridge@ti.com>
Tested-by: Sekhar Nori <nsekhar@ti.com>

2 files changed, 21 insertions, 1 deletions

diff --git a/drivers/bus/omap_l3_noc.c b/drivers/bus/omap_l3_noc.c
index 00e4fed4a39b..9d021d002bec 100644
--- a/drivers/bus/omap_l3_noc.c
+++ b/drivers/bus/omap_l3_noc.c
@@ -60,8 +60,10 @@ static int l3_handle_target(struct omap_l3 *l3, void __iomem *base,
 {
         int k;
         u32 std_err_main, clear, masterid;
+        u8 op_code;
         void __iomem *l3_targ_base;
         void __iomem *l3_targ_stderr, *l3_targ_slvofslsb, *l3_targ_mstaddr;
+        void __iomem *l3_targ_hdr;
         struct l3_target_data *l3_targ_inst;
         struct l3_masters_data *master;
         char *target_name, *master_name = "UN IDENTIFIED";
@@ -96,6 +98,7 @@ static int l3_handle_target(struct omap_l3 *l3, void __iomem *base,
                          readl_relaxed(l3_targ_slvofslsb));
 
                 l3_targ_mstaddr = l3_targ_base + L3_TARG_STDERRLOG_MSTADDR;
+                l3_targ_hdr = l3_targ_base + L3_TARG_STDERRLOG_HDR;
                 break;
 
         case CUSTOM_ERROR:
@@ -103,6 +106,7 @@ static int l3_handle_target(struct omap_l3 *l3, void __iomem *base,
 
                 l3_targ_mstaddr = l3_targ_base +
                                   L3_TARG_STDERRLOG_CINFO_MSTADDR;
+                l3_targ_hdr = l3_targ_base + L3_TARG_STDERRLOG_CINFO_OPCODE;
                 break;
 
         default:
@@ -122,11 +126,14 @@ static int l3_handle_target(struct omap_l3 *l3, void __iomem *base,
                 }
         }
 
+        op_code = readl_relaxed(l3_targ_hdr) & 0x7;
+
         WARN(true,
-             "%s:L3 %s Error: MASTER %s TARGET %s%s\n",
+             "%s:L3 %s Error: MASTER %s TARGET %s (%s)%s\n",
              dev_name(l3->dev),
              err_description,
              master_name, target_name,
+             l3_transaction_type[op_code],
              err_string);
 
         /* clear the std error log*/
diff --git a/drivers/bus/omap_l3_noc.h b/drivers/bus/omap_l3_noc.h
index 4e18307470f6..6670fd98ce7c 100644
--- a/drivers/bus/omap_l3_noc.h
+++ b/drivers/bus/omap_l3_noc.h
@@ -29,14 +29,27 @@
 
 /* L3 TARG register offsets */
 #define L3_TARG_STDERRLOG_MAIN          0x48
+#define L3_TARG_STDERRLOG_HDR           0x4c
 #define L3_TARG_STDERRLOG_MSTADDR       0x50
 #define L3_TARG_STDERRLOG_SLVOFSLSB     0x5c
 #define L3_TARG_STDERRLOG_CINFO_MSTADDR 0x68
+#define L3_TARG_STDERRLOG_CINFO_OPCODE  0x6c
 #define L3_FLAGMUX_REGERR0              0xc
 #define L3_FLAGMUX_MASK0                0x8
 
 #define L3_TARGET_NOT_SUPPORTED         NULL
 
+static const char * const l3_transaction_type[] = {
+        /* 0 0 0 */ "Idle",
+        /* 0 0 1 */ "Write",
+        /* 0 1 0 */ "Read",
+        /* 0 1 1 */ "ReadEx",
+        /* 1 0 0 */ "Read Link",
+        /* 1 0 1 */ "Write Non-Posted",
+        /* 1 1 0 */ "Write Conditional",
+        /* 1 1 1 */ "Write Broadcast",
+};
+
 /**
  * struct l3_masters_data - L3 Master information
  * @id:         ID of the L3 Master