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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>
This commit is contained in:
Gil Fine 2021-02-16 15:04:26 +02:00 committed by Mika Westerberg
parent a38fd87484
commit 815f421b6f
1 changed files with 26 additions and 13 deletions
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39
drivers/thunderbolt/debugfs.c
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@ -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;