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firewire: debug interrupt events
This adds debug printks for asynchronous transmission and reception and for self ID reception. They can be enabled at module load time, and at runtime via /sys/module/firewire_ohci/parameters/debug. Signed-off-by: Jarod Wilson <jwilson@redhat.com> Also added: Logging of interrupt event codes and of cancelled AT packets. The code now depends on a Kconfig variable. This makes it easier to build firewire-ohci without the feature or to make it an option in the future. The variable is currently hidden and always on. This feature inflates firewire-ohci.ko by 7 kB = 27% on x86-64 and by 4 kB = 23% on i686. Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
This commit is contained in:
Stefan Richter
parent
016bf3dfcf
commit
ad3c0fe8b8
@ -54,6 +54,11 @@ config FIREWIRE_OHCI
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directive, use "install modulename /bin/true" for the modules to be
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blacklisted.
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config FIREWIRE_OHCI_DEBUG
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bool
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depends on FIREWIRE_OHCI
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default y
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config FIREWIRE_SBP2
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tristate "Support for storage devices (SBP-2 protocol driver)"
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depends on FIREWIRE && SCSI
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@ -27,6 +27,7 @@
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#include <linux/kernel.h>
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#include <linux/mm.h>
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#include <linux/module.h>
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#include <linux/moduleparam.h>
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#include <linux/pci.h>
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#include <linux/spinlock.h>
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@ -237,6 +238,179 @@ static inline struct fw_ohci *fw_ohci(struct fw_card *card)
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static char ohci_driver_name[] = KBUILD_MODNAME;
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#ifdef CONFIG_FIREWIRE_OHCI_DEBUG
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#define OHCI_PARAM_DEBUG_IRQS 1
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#define OHCI_PARAM_DEBUG_SELFIDS 2
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#define OHCI_PARAM_DEBUG_AT_AR 4
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static int param_debug;
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module_param_named(debug, param_debug, int, 0644);
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MODULE_PARM_DESC(debug, "Verbose logging (default = 0"
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", IRQs = " __stringify(OHCI_PARAM_DEBUG_IRQS)
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", self-IDs = " __stringify(OHCI_PARAM_DEBUG_SELFIDS)
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", AT/AR events = " __stringify(OHCI_PARAM_DEBUG_AT_AR)
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", or a combination, or all = -1)");
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static void log_irqs(u32 evt)
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{
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if (likely(!(param_debug & OHCI_PARAM_DEBUG_IRQS)))
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return;
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printk(KERN_DEBUG KBUILD_MODNAME ": IRQ %08x%s%s%s%s%s%s%s%s%s%s%s\n",
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evt,
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evt & OHCI1394_selfIDComplete ? " selfID" : "",
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evt & OHCI1394_RQPkt ? " AR_req" : "",
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evt & OHCI1394_RSPkt ? " AR_resp" : "",
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evt & OHCI1394_reqTxComplete ? " AT_req" : "",
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evt & OHCI1394_respTxComplete ? " AT_resp" : "",
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evt & OHCI1394_isochRx ? " IR" : "",
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evt & OHCI1394_isochTx ? " IT" : "",
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evt & OHCI1394_postedWriteErr ? " postedWriteErr" : "",
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evt & OHCI1394_cycleTooLong ? " cycleTooLong" : "",
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evt & OHCI1394_cycle64Seconds ? " cycle64Seconds" : "",
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evt & ~(OHCI1394_selfIDComplete | OHCI1394_RQPkt |
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OHCI1394_RSPkt | OHCI1394_reqTxComplete |
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OHCI1394_respTxComplete | OHCI1394_isochRx |
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OHCI1394_isochTx | OHCI1394_postedWriteErr |
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OHCI1394_cycleTooLong | OHCI1394_cycle64Seconds)
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? " ?" : "");
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}
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static const char *speed[] = {
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[0] = "S100", [1] = "S200", [2] = "S400", [3] = "beta",
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};
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static const char *power[] = {
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[0] = "+0W", [1] = "+15W", [2] = "+30W", [3] = "+45W",
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[4] = "-3W", [5] = " ?W", [6] = "-3..-6W", [7] = "-3..-10W",
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};
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static const char port[] = { '.', '-', 'p', 'c', };
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static char _p(u32 *s, int shift)
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{
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return port[*s >> shift & 3];
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}
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static void log_selfids(int generation, int self_id_count, u32 *s)
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{
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if (likely(!(param_debug & OHCI_PARAM_DEBUG_SELFIDS)))
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return;
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printk(KERN_DEBUG KBUILD_MODNAME ": %d selfIDs, generation %d\n",
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self_id_count, generation);
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for (; self_id_count--; ++s)
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if ((*s & 1 << 23) == 0)
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printk(KERN_DEBUG "selfID 0: %08x, phy %d [%c%c%c] "
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"%s gc=%d %s %s%s%s\n",
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*s, *s >> 24 & 63, _p(s, 6), _p(s, 4), _p(s, 2),
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speed[*s >> 14 & 3], *s >> 16 & 63,
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power[*s >> 8 & 7], *s >> 22 & 1 ? "L" : "",
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*s >> 11 & 1 ? "c" : "", *s & 2 ? "i" : "");
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else
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printk(KERN_DEBUG "selfID n: %08x, phy %d "
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"[%c%c%c%c%c%c%c%c]\n",
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*s, *s >> 24 & 63,
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_p(s, 16), _p(s, 14), _p(s, 12), _p(s, 10),
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_p(s, 8), _p(s, 6), _p(s, 4), _p(s, 2));
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}
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static const char *evts[] = {
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[0x00] = "evt_no_status", [0x01] = "-reserved-",
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[0x02] = "evt_long_packet", [0x03] = "evt_missing_ack",
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[0x04] = "evt_underrun", [0x05] = "evt_overrun",
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[0x06] = "evt_descriptor_read", [0x07] = "evt_data_read",
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[0x08] = "evt_data_write", [0x09] = "evt_bus_reset",
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[0x0a] = "evt_timeout", [0x0b] = "evt_tcode_err",
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[0x0c] = "-reserved-", [0x0d] = "-reserved-",
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[0x0e] = "evt_unknown", [0x0f] = "evt_flushed",
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[0x10] = "-reserved-", [0x11] = "ack_complete",
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[0x12] = "ack_pending ", [0x13] = "-reserved-",
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[0x14] = "ack_busy_X", [0x15] = "ack_busy_A",
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[0x16] = "ack_busy_B", [0x17] = "-reserved-",
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[0x18] = "-reserved-", [0x19] = "-reserved-",
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[0x1a] = "-reserved-", [0x1b] = "ack_tardy",
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[0x1c] = "-reserved-", [0x1d] = "ack_data_error",
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[0x1e] = "ack_type_error", [0x1f] = "-reserved-",
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[0x20] = "pending/cancelled",
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};
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static const char *tcodes[] = {
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[0x0] = "QW req", [0x1] = "BW req",
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[0x2] = "W resp", [0x3] = "-reserved-",
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[0x4] = "QR req", [0x5] = "BR req",
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[0x6] = "QR resp", [0x7] = "BR resp",
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[0x8] = "cycle start", [0x9] = "Lk req",
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[0xa] = "async stream packet", [0xb] = "Lk resp",
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[0xc] = "-reserved-", [0xd] = "-reserved-",
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[0xe] = "link internal", [0xf] = "-reserved-",
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};
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static const char *phys[] = {
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[0x0] = "phy config packet", [0x1] = "link-on packet",
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[0x2] = "self-id packet", [0x3] = "-reserved-",
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};
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static void log_ar_at_event(char dir, int speed, u32 *header, int evt)
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{
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int tcode = header[0] >> 4 & 0xf;
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char specific[12];
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if (likely(!(param_debug & OHCI_PARAM_DEBUG_AT_AR)))
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return;
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if (unlikely(evt >= ARRAY_SIZE(evts)))
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evt = 0x1f;
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if (header[0] == ~header[1]) {
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printk(KERN_DEBUG "A%c %s, %s, %08x\n",
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dir, evts[evt], phys[header[0] >> 30 & 0x3],
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header[0]);
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return;
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}
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switch (tcode) {
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case 0x0: case 0x6: case 0x8:
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snprintf(specific, sizeof(specific), " = %08x",
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be32_to_cpu((__force __be32)header[3]));
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break;
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case 0x1: case 0x5: case 0x7: case 0x9: case 0xb:
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snprintf(specific, sizeof(specific), " %x,%x",
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header[3] >> 16, header[3] & 0xffff);
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break;
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default:
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specific[0] = '\0';
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}
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switch (tcode) {
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case 0xe: case 0xa:
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printk(KERN_DEBUG "A%c %s, %s\n",
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dir, evts[evt], tcodes[tcode]);
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break;
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case 0x0: case 0x1: case 0x4: case 0x5: case 0x9:
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printk(KERN_DEBUG "A%c spd %x tl %02x, "
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"%04x -> %04x, %s, "
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"%s, %04x%08x%s\n",
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dir, speed, header[0] >> 10 & 0x3f,
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header[1] >> 16, header[0] >> 16, evts[evt],
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tcodes[tcode], header[1] & 0xffff, header[2], specific);
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break;
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default:
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printk(KERN_DEBUG "A%c spd %x tl %02x, "
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"%04x -> %04x, %s, "
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"%s%s\n",
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dir, speed, header[0] >> 10 & 0x3f,
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header[1] >> 16, header[0] >> 16, evts[evt],
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tcodes[tcode], specific);
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}
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}
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#else
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#define log_irqs(evt)
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#define log_selfids(generation, self_id_count, sid)
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#define log_ar_at_event(dir, speed, header, evt)
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#endif /* CONFIG_FIREWIRE_OHCI_DEBUG */
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static inline void reg_write(const struct fw_ohci *ohci, int offset, u32 data)
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{
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writel(data, ohci->registers + offset);
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@ -368,6 +542,8 @@ static __le32 *handle_ar_packet(struct ar_context *ctx, __le32 *buffer)
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p.timestamp = status & 0xffff;
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p.generation = ohci->request_generation;
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log_ar_at_event('R', p.speed, p.header, status >> 16 & 0x1f);
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/*
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* The OHCI bus reset handler synthesizes a phy packet with
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* the new generation number when a bus reset happens (see
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@ -817,6 +993,8 @@ static int handle_at_packet(struct context *context,
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evt = le16_to_cpu(last->transfer_status) & 0x1f;
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packet->timestamp = le16_to_cpu(last->res_count);
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log_ar_at_event('T', packet->speed, packet->header, evt);
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switch (evt) {
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case OHCI1394_evt_timeout:
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/* Async response transmit timed out. */
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@ -1118,6 +1296,8 @@ static void bus_reset_tasklet(unsigned long data)
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dma_free_coherent(ohci->card.device, CONFIG_ROM_SIZE,
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free_rom, free_rom_bus);
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log_selfids(generation, self_id_count, ohci->self_id_buffer);
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fw_core_handle_bus_reset(&ohci->card, ohci->node_id, generation,
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self_id_count, ohci->self_id_buffer);
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}
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@ -1134,6 +1314,7 @@ static irqreturn_t irq_handler(int irq, void *data)
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return IRQ_NONE;
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reg_write(ohci, OHCI1394_IntEventClear, event);
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log_irqs(event);
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if (event & OHCI1394_selfIDComplete)
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tasklet_schedule(&ohci->bus_reset_tasklet);
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@ -1436,6 +1617,7 @@ static int ohci_cancel_packet(struct fw_card *card, struct fw_packet *packet)
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if (packet->ack != 0)
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goto out;
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log_ar_at_event('T', packet->speed, packet->header, 0x20);
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driver_data->packet = NULL;
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packet->ack = RCODE_CANCELLED;
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packet->callback(packet, &ohci->card, packet->ack);
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