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Date: Mon, 23 Feb 2009 14:13:27 +0100 (CET)
From: Stefan Richter <stefanr@...6.in-berlin.de>
To: Henrik Kurelid <henke@...elid.se>
cc: linux1394-devel@...ts.sourceforge.net, linux-kernel@...r.kernel.org
Subject: [PATCH] firedtv: reinstate debug logging option
Henrik Kurelid tells me that FCP debug logging (which I removed during
cleanups) is still useful when working on driver issues together with
end users. So bring it back in an updated form with only 60% of the
original code footprint.
Logging can be enabled with
# echo -1 > /sys/module/firedtv/parameters/debug
1 instead of -1 enables only FCP header logging,
2 instead of -1 enables only hexdumps of the entire FCP frames.
0 switches logging off again.
Signed-off-by: Stefan Richter <stefanr@...6.in-berlin.de>
---
Henrik, below the diff is an example session with both debug flags
switched on. Please check if this is sufficient.
BTW, I'd rather call print_hex_dump() with groupsize=4 instead of 1, but
this would log the data in wrong order on little endian PCs and that's
not useful. I guess I need to submit a network byte order variant of
print_hex_dump().
drivers/media/dvb/firewire/firedtv-avc.c | 78 +++++++++++++++++++++++
1 file changed, 78 insertions(+)
Index: linux/drivers/media/dvb/firewire/firedtv-avc.c
===================================================================
--- linux.orig/drivers/media/dvb/firewire/firedtv-avc.c
+++ linux/drivers/media/dvb/firewire/firedtv-avc.c
@@ -88,6 +88,78 @@ struct avc_response_frame {
u8 operand[509];
};
+#define AVC_DEBUG_FCP_SUBACTIONS 1
+#define AVC_DEBUG_FCP_PAYLOADS 2
+
+static int avc_debug;
+module_param_named(debug, avc_debug, int, 0644);
+MODULE_PARM_DESC(debug, "Verbose logging (default = 0"
+ ", FCP subactions = " __stringify(AVC_DEBUG_FCP_SUBACTIONS)
+ ", FCP payloads = " __stringify(AVC_DEBUG_FCP_PAYLOADS)
+ ", or all = -1)");
+
+static const char *debug_fcp_ctype(unsigned int ctype)
+{
+ static const char *ctypes[] = {
+ [0x0] = "CONTROL", [0x1] = "STATUS",
+ [0x2] = "SPECIFIC INQUIRY", [0x3] = "NOTIFY",
+ [0x4] = "GENERAL INQUIRY", [0x8] = "NOT IMPLEMENTED",
+ [0x9] = "ACCEPTED", [0xa] = "REJECTED",
+ [0xb] = "IN TRANSITION", [0xc] = "IMPLEMENTED/STABLE",
+ [0xd] = "CHANGED", [0xf] = "INTERIM",
+ };
+ const char *ret = ctype < ARRAY_SIZE(ctypes) ? ctypes[ctype] : NULL;
+
+ return ret ? ret : "?";
+}
+
+static const char *debug_fcp_opcode(unsigned int opcode,
+ const u8 *data, size_t length)
+{
+ switch (opcode) {
+ case AVC_OPCODE_VENDOR: break;
+ case AVC_OPCODE_READ_DESCRIPTOR: return "ReadDescriptor";
+ case AVC_OPCODE_DSIT: return "DirectSelectInfo.Type";
+ case AVC_OPCODE_DSD: return "DirectSelectData";
+ default: return "?";
+ }
+
+ if (length < 7 ||
+ data[3] != SFE_VENDOR_DE_COMPANYID_0 ||
+ data[4] != SFE_VENDOR_DE_COMPANYID_1 ||
+ data[5] != SFE_VENDOR_DE_COMPANYID_2)
+ return "Vendor";
+
+ switch (data[6]) {
+ case SFE_VENDOR_OPCODE_REGISTER_REMOTE_CONTROL: return "RegisterRC";
+ case SFE_VENDOR_OPCODE_LNB_CONTROL: return "LNBControl";
+ case SFE_VENDOR_OPCODE_TUNE_QPSK: return "TuneQPSK";
+ case SFE_VENDOR_OPCODE_HOST2CA: return "Host2CA";
+ case SFE_VENDOR_OPCODE_CA2HOST: return "CA2Host";
+ }
+ return "Vendor";
+}
+
+static void debug_fcp(const u8 *data, size_t length)
+{
+ unsigned int subunit_type, subunit_id, op;
+ const char *prefix = data[0] > 7 ? "FCP <- " : "FCP -> ";
+
+ if (avc_debug & AVC_DEBUG_FCP_SUBACTIONS) {
+ subunit_type = data[1] >> 3;
+ subunit_id = data[1] & 7;
+ op = subunit_type == 0x1e || subunit_id == 5 ? ~0 : data[2];
+ printk(KERN_INFO "%ssu=%x.%x l=%d: %-8s - %s\n",
+ prefix, subunit_type, subunit_id, length,
+ debug_fcp_ctype(data[0]),
+ debug_fcp_opcode(op, data, length));
+ }
+
+ if (avc_debug & AVC_DEBUG_FCP_PAYLOADS)
+ print_hex_dump(KERN_INFO, prefix, DUMP_PREFIX_NONE, 16, 1,
+ data, length, false);
+}
+
static int __avc_write(struct firedtv *fdtv,
const struct avc_command_frame *c, struct avc_response_frame *r)
{
@@ -97,6 +169,9 @@ static int __avc_write(struct firedtv *f
fdtv->avc_reply_received = false;
for (retry = 0; retry < 6; retry++) {
+ if (unlikely(avc_debug))
+ debug_fcp(&c->ctype, c->length);
+
err = fdtv->backend->write(fdtv, FCP_COMMAND_REGISTER,
(void *)&c->ctype, c->length);
if (err) {
@@ -144,6 +219,9 @@ int avc_recv(struct firedtv *fdtv, void
struct avc_response_frame *r =
data - offsetof(struct avc_response_frame, response);
+ if (unlikely(avc_debug))
+ debug_fcp(data, length);
+
if (length >= 8 &&
r->operand[0] == SFE_VENDOR_DE_COMPANYID_0 &&
r->operand[1] == SFE_VENDOR_DE_COMPANYID_1 &&
This is how a debug session will look like:
(driver probe)
input: FireDTV remote control as /devices/pci0000:00/0000:00:1e.0/0000:05:00.4/fw-host1/input/input11
FCP -> su=5.0 l=12: CONTROL - ReadDescriptor
FCP -> 00 28 09 00 ff 00 00 08 00 0d 00 00
FCP <- su=5.0 l=20: ACCEPTED - ReadDescriptor
FCP <- 09 28 09 00 10 00 00 08 00 0d 20 10 00 60 00 00
FCP <- 01 82 12 00
DVB: registering new adapter (FireDTV C/CI)
DVB: registering adapter 0 frontend 0 (FireDTV C/CI)...
FCP -> su=5.0 l=12: CONTROL - ReadDescriptor
FCP -> 00 28 09 80 ff 00 00 00 00 00 00 00
FCP <- su=5.0 l=64: ACCEPTED - ReadDescriptor
FCP <- 09 28 09 80 10 00 00 34 00 00 00 32 16 20 00 00
FCP <- 00 00 00 00 ff c0 9a c9 0a c6 00 24 96 00 02 00
FCP <- 62 00 00 19 00 20 66 e5 9c 30 dc a1 28 94 92 00
FCP <- ff ff 18 0b 00 03 20 00 80 01 00 00 00 02 00 00
firedtv 0012870036002bd7-0: Conditional Access Module not enabled
FCP -> su=1f.7 l=8: NOTIFY - RegisterRC
FCP -> 03 ff 00 00 12 87 0a 00
FCP <- su=1f.7 l=8: INTERIM - RegisterRC
FCP <- 0f ff 00 00 12 87 0a 00
(pressing a key on the remote control)
FCP <- su=1f.7 l=12: CHANGED - RegisterRC
FCP <- 0d ff 00 00 12 87 0a 03 1f 00 00 00
FCP -> su=1f.7 l=8: NOTIFY - RegisterRC
FCP -> 03 ff 00 00 12 87 0a 00
FCP <- su=1f.7 l=8: INTERIM - RegisterRC
FCP <- 0f ff 00 00 12 87 0a 00
(starting kaffeine)
FCP -> su=5.0 l=28: CONTROL - DirectSelectData
FCP -> 00 28 cb 00 d2 20 00 11 19 00 00 00 00 00 82 6b
FCP -> 24 01 af 40 00 00 18 00 00 00 00 00
FCP <- su=5.0 l=28: ACCEPTED - DirectSelectData
FCP <- 09 28 cb 00 d2 20 00 11 19 00 00 00 00 00 82 6b
FCP <- 24 01 af 40 00 00 18 00 00 00 00 00
FCP -> su=5.0 l=12: CONTROL - ReadDescriptor
FCP -> 00 28 09 80 ff 00 00 00 00 00 00 00
FCP <- su=5.0 l=64: ACCEPTED - ReadDescriptor
FCP <- 09 28 09 80 10 00 00 34 00 00 00 32 16 20 00 00
FCP <- 00 00 00 00 ff c0 9a c9 0a c6 00 24 96 00 02 00
FCP <- 62 00 00 19 00 20 7d 6a 9c 30 dc a1 28 94 92 00
FCP <- ff ff 18 0b 00 03 20 00 80 01 00 00 00 02 00 00
FCP -> su=5.0 l=16: CONTROL - DirectSelectData
FCP -> 00 28 cb 00 d2 20 00 00 01 13 80 03 53 00 00 00
FCP <- su=5.0 l=16: ACCEPTED - DirectSelectData
FCP <- 09 28 cb 00 d2 20 00 00 01 13 80 03 53 00 00 00
FCP -> su=5.0 l=12: CONTROL - ReadDescriptor
FCP -> 00 28 09 80 ff 00 00 00 00 00 00 00
FCP <- su=5.0 l=64: ACCEPTED - ReadDescriptor
FCP <- 09 28 09 80 10 00 00 34 00 00 00 32 16 20 00 00
FCP <- 00 00 00 00 ff c0 9a c9 0a c6 00 24 96 00 02 00
FCP <- 62 00 00 19 00 20 95 6a 9c 30 dc a1 28 94 92 00
FCP <- ff ff 18 0b 00 03 20 00 80 01 00 00 00 02 00 00
FCP -> su=5.0 l=24: CONTROL - DirectSelectData
FCP -> 00 28 cb 00 d2 20 00 00 02 13 80 03 53 00 00 13
FCP -> 80 00 12 00 00 00 00 00
FCP <- su=5.0 l=24: ACCEPTED - DirectSelectData
FCP <- 09 28 cb 00 d2 20 00 00 02 13 80 03 53 00 00 13
FCP <- 80 00 12 00 00 00 00 00
FCP -> su=5.0 l=12: CONTROL - ReadDescriptor
FCP -> 00 28 09 80 ff 00 00 00 00 00 00 00
FCP <- su=5.0 l=64: ACCEPTED - ReadDescriptor
FCP <- 09 28 09 80 10 00 00 34 00 00 00 32 16 20 00 00
FCP <- 00 00 00 00 ff c0 9a c9 0a c6 00 24 96 00 02 00
FCP <- 62 00 00 19 00 20 ba 6b 9c 30 dc a1 28 94 92 00
FCP <- ff ff 18 0b 00 03 20 00 80 01 00 00 00 02 00 00
[...]
--
Stefan Richter
-=====-==--= --=- =-===
http://arcgraph.de/sr/
--
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