thunderbolt: debugfs: Handle fail reading block

There are cases when reading block of dwords in single transaction fail,
for several reasons, mostly if HW publish to implement all of the dwords,
while actually it doesn't or if some dwords not accessible for read
for security reasons. We handle these cases by trying to read the block,
dword-by-dword, one dword per transaction, till we get a failure.

Signed-off-by: Gil Fine <gil.fine@intel.com>
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>

diff --git a/drivers/thunderbolt/debugfs.c b/drivers/thunderbolt/debugfs.c
index 9541d74..2010365 100644 (file)
--- a/drivers/thunderbolt/debugfs.c
+++ b/drivers/thunderbolt/debugfs.c
@@ -251,6 +251,31 @@ out:
        return ret < 0 ? ret : count;
 }
 
+static void cap_show_by_dw(struct seq_file *s, struct tb_switch *sw,
+                          struct tb_port *port, unsigned int cap,
+                          unsigned int offset, u8 cap_id, u8 vsec_id,
+                          int dwords)
+{
+       int i, ret;
+       u32 data;
+
+       for (i = 0; i < dwords; i++) {
+               if (port)
+                       ret = tb_port_read(port, &data, TB_CFG_PORT, cap + offset + i, 1);
+               else
+                       ret = tb_sw_read(sw, &data, TB_CFG_SWITCH, cap + offset + i, 1);
+               if (ret) {
+                       seq_printf(s, "0x%04x <not accessible>\n", cap + offset);
+                       if (dwords - i > 1)
+                               seq_printf(s, "0x%04x ...\n", cap + offset + 1);
+                       return;
+               }
+
+               seq_printf(s, "0x%04x %4d 0x%02x 0x%02x 0x%08x\n", cap + offset + i,
+                          offset + i, cap_id, vsec_id, data);
+       }
+}
+
 static void cap_show(struct seq_file *s, struct tb_switch *sw,
                     struct tb_port *port, unsigned int cap, u8 cap_id,
                     u8 vsec_id, int length)
@@ -267,10 +292,7 @@ static void cap_show(struct seq_file *s, struct tb_switch *sw,
                else
                        ret = tb_sw_read(sw, data, TB_CFG_SWITCH, cap + offset, dwords);
                if (ret) {
-                       seq_printf(s, "0x%04x <not accessible>\n",
-                                  cap + offset);
-                       if (dwords > 1)
-                               seq_printf(s, "0x%04x ...\n", cap + offset + 1);
+                       cap_show_by_dw(s, sw, port, cap, offset, cap_id, vsec_id, dwords);
                        return;
                }
 
@@ -341,15 +363,6 @@ static void port_cap_show(struct tb_port *port, struct seq_file *s,
                } else {
                        length = header.extended_short.length;
                        vsec_id = header.extended_short.vsec_id;
-                       /*
-                        * Ice Lake and Tiger Lake do not implement the
-                        * full length of the capability, only first 32
-                        * dwords so hard-code it here.
-                        */
-                       if (!vsec_id &&
-                           (tb_switch_is_ice_lake(port->sw) ||
-                            tb_switch_is_tiger_lake(port->sw)))
-                               length = 32;
                }
                break;