Hello, while extending our platform to allow for non-ISA interrupts on serial ports I've found that after boot-up device is properly enabled at I/O base 0x500, and assigned IRQ 16, but IRQ 16 is not listed in /proc/interrupts, and attempts to open serial port (/dev/ttyS4) fail with EIO error. After system is soft-rebooted, kernel finds that device is already enabled (because we do not reprogram device configuration on soft reboot), reuses base 0x500 and IRQ 16, and /dev/ttyS4 works. Inspection of pnpacpi revealed that nobody will call acpi_register_gsi if device is disabled when discovered by the kernel, but kernel will then happilly try to assign IRQ 16-23 to the device - and if interrupt happens to be not used by any other (PCI) device, nobody will call acpi_register_gsi, and register_irq(16) from serial port driver will fail :-( Diff below fixes issue - with patch serial ports work even immediately after hard reboot. Resources for the port as reported by the kernel are in the attachment - allocated resources were decided by the kernel, possible are reported by the ACPI's _PRS. I have no system which would use non 1:1 mapping for GSI<->IRQ (except 0/2 which is already blacklisted in pnpacpi), so I have no idea whether adding it to non-extended IRQ descriptor handling breaks something somewhere or not. But given that translation happens in _CRS it seems more correct to me to do acpi_register_gsi always. There are two more problems I've discovered during testing: 1. I had to restrict I/O base to 0x500-0xBF8 (from original 0x100-0xFFFF), as otherwise kernel happilly enables one of serial ports at 0x170, although IDE already occupied that port - it seems that resources occupied by IDE are reported only after libata loads, and as libata loads after serial port driver, pnpacpi does not seem to notice that 0x170 is in use, rather than available for allocation, enables device there, and then system gets very confused. 2. pnpacpi lacks support for both hot-add and hot-remove. So serial ports cannot be neither added nor removed while system runs. I guess that's the next task. Thanks, Petr Vandrovec From: Petr Vandrovec <petr@xxxxxxxxxx> Convert interrupt numbers from GSI to IRQ for _PRS pnpacpi calls acpi_register_gsi only when interrupt resource is read via _CRS method - either when device is discovered (if it was already enabled when pnpacpi initializes), or when someone calls 'get' method on the device. What is missing from this list is invoking acpi_register_gsi when someone issues _SRS method to enable device. And if nobody issues acpi_register_gsi, then device may not work if it is only device using GSI selected by the kernel. As whole kernel thinks in terms of IRQs, rather than GSIs, it seems that correct place where to call acpi_register_gsi is when possible resources are retrieved from _PRS, rather than just before _SRS invocation, so that is what I did. I've enabled checking to make sure we are not selecting mismatching level/edge configuration (with dev_warn, same way _CRS warns). But it may be too noisy, as on almost all systems I could check we get warnings that IRQ 9 is used by ACPI as level/low, while resource descriptors list it as edge/high (together with other IRQs in 3-15 range). Signed-off-by: Petr Vandrovec <petr@xxxxxxxxxx> diff --git a/drivers/pnp/pnpacpi/rsparser.c b/drivers/pnp/pnpacpi/rsparser.c index 5be4a39..3243bf4 100644 --- a/drivers/pnp/pnpacpi/rsparser.c +++ b/drivers/pnp/pnpacpi/rsparser.c @@ -518,6 +518,47 @@ static __init void pnpacpi_parse_dma_option(struct pnp_dev *dev, pnp_register_dma_resource(dev, option_flags, map, flags); } +static __init void pnpacpi_gsi_option_to_irq(struct pnp_dev *dev, + pnp_irq_mask_t *map, + u32 gsi, + int triggering, + int polarity) +{ + int p, t; + int irq; + + /* GSI 0 is ignored. */ + if (!gsi) + return; + + /* + * In IO-APIC mode, accept interrupt only if its trigger/polarity + * matches with one already selected. + */ + if (!acpi_get_override_irq(gsi, &t, &p)) { + t = t ? ACPI_LEVEL_SENSITIVE : ACPI_EDGE_SENSITIVE; + p = p ? ACPI_ACTIVE_LOW : ACPI_ACTIVE_HIGH; + if (triggering != t || polarity != p) { + dev_warn(&dev->dev, "IRQ %d status %s, %s does not match override %s, %s\n", + gsi, triggering ? "edge" : "level", + polarity ? "low" : "high", + t ? "edge":"level", p ? "low":"high"); + return; + } + } + irq = acpi_register_gsi(&dev->dev, gsi, triggering, polarity); + if (irq < 0) + dev_err(&dev->dev, "ignoring IRQ %d option " + "(cannot be mapped to platform IRQ)\n", + gsi); + else if (irq < PNP_IRQ_NR) + __set_bit(irq, map->bits); + else + dev_err(&dev->dev, "ignoring IRQ %d (GSI %d) option " + "(too large for %d entry bitmap)\n", + irq, gsi, PNP_IRQ_NR); +} + static __init void pnpacpi_parse_irq_option(struct pnp_dev *dev, unsigned int option_flags, struct acpi_resource_irq *p) @@ -528,8 +569,8 @@ static __init void pnpacpi_parse_irq_option(struct pnp_dev *dev, bitmap_zero(map.bits, PNP_IRQ_NR); for (i = 0; i < p->interrupt_count; i++) - if (p->interrupts[i]) - __set_bit(p->interrupts[i], map.bits); + pnpacpi_gsi_option_to_irq(dev, &map, p->interrupts[i], + p->triggering, p->polarity); flags = irq_flags(p->triggering, p->polarity, p->sharable); pnp_register_irq_resource(dev, option_flags, &map, flags); @@ -544,16 +585,9 @@ static __init void pnpacpi_parse_ext_irq_option(struct pnp_dev *dev, unsigned char flags; bitmap_zero(map.bits, PNP_IRQ_NR); - for (i = 0; i < p->interrupt_count; i++) { - if (p->interrupts[i]) { - if (p->interrupts[i] < PNP_IRQ_NR) - __set_bit(p->interrupts[i], map.bits); - else - dev_err(&dev->dev, "ignoring IRQ %d option " - "(too large for %d entry bitmap)\n", - p->interrupts[i], PNP_IRQ_NR); - } - } + for (i = 0; i < p->interrupt_count; i++) + pnpacpi_gsi_option_to_irq(dev, &map, p->interrupts[i], + p->triggering, p->polarity); flags = irq_flags(p->triggering, p->polarity, p->sharable); pnp_register_irq_resource(dev, option_flags, &map, flags);
00:0b PNP0501 16550A-compatible serial port state = active allocated resources: io 0x500-0x507 irq 16 possible resources: Dependent: 00 - Priority acceptable port 0x500-0xbf8, align 0x7, size 0x8, 16-bit address decoding irq 16,17,18,19,20,21,22,23 Low-Level Dependent: 01 - Priority functional port 0xd00-0x4558, align 0x7, size 0x8, 16-bit address decoding irq 16,17,18,19,20,21,22,23 Low-Level Dependent: 02 - Priority functional port 0x5680-0xfdf8, align 0x7, size 0x8, 16-bit address decoding irq 16,17,18,19,20,21,22,23 Low-Level Dependent: 03 - Priority acceptable port 0x500-0xbf8, align 0x7, size 0x8, 16-bit address decoding irq 3,4,5,6,7,10,11,12,14,15 High-Edge Dependent: 04 - Priority functional port 0xd00-0x4558, align 0x7, size 0x8, 16-bit address decoding irq 3,4,5,6,7,10,11,12,14,15 High-Edge Dependent: 05 - Priority functional port 0x5680-0xfdf8, align 0x7, size 0x8, 16-bit address decoding irq 3,4,5,6,7,10,11,12,14,15 High-Edge
[ 3.203174] pnp 00:09: [io 0x03e8-0x03ef] [ 3.203407] pnp 00:09: [irq 4] [ 3.203443] pnp 00:09: Plug and Play ACPI device, IDs PNP0501 (active) [ 3.203620] pnp 00:0a: [io 0x02e8-0x02ef] [ 3.203852] pnp 00:0a: [irq 3] [ 3.203886] pnp 00:0a: Plug and Play ACPI device, IDs PNP0501 (active) [ 3.204098] pnp 00:0b: Plug and Play ACPI device, IDs PNP0501 (disabled) [ 3.204169] pnp 00:0c: Plug and Play ACPI device, IDs PNP0501 (disabled) [ 3.204268] pnp 00:0d: Plug and Play ACPI device, IDs PNP0501 (disabled) [ 3.204366] pnp 00:0e: Plug and Play ACPI device, IDs PNP0501 (disabled) [ 3.204437] pnp 00:0f: Plug and Play ACPI device, IDs PNP0501 (disabled) [ 3.204535] pnp 00:10: Plug and Play ACPI device, IDs PNP0501 (disabled) [ 3.204606] pnp 00:11: Plug and Play ACPI device, IDs PNP0501 (disabled) [ 3.204675] pnp 00:12: Plug and Play ACPI device, IDs PNP0501 (disabled) [ 3.204774] pnp 00:13: Plug and Play ACPI device, IDs PNP0501 (disabled) [ 3.204875] pnp 00:14: Plug and Play ACPI device, IDs PNP0501 (disabled) [ 3.205147] pnp 00:15: Plug and Play ACPI device, IDs PNP0501 (disabled) [ 3.205247] pnp 00:16: Plug and Play ACPI device, IDs PNP0501 (disabled) [ 3.205319] pnp 00:17: Plug and Play ACPI device, IDs PNP0501 (disabled) [ 3.205390] pnp 00:18: Plug and Play ACPI device, IDs PNP0501 (disabled) [ 3.205490] pnp 00:19: Plug and Play ACPI device, IDs PNP0501 (disabled) [ 3.205562] pnp 00:1a: Plug and Play ACPI device, IDs PNP0501 (disabled) [ 3.205689] pnp 00:1b: Plug and Play ACPI device, IDs PNP0501 (disabled) [ 3.205762] pnp 00:1c: Plug and Play ACPI device, IDs PNP0501 (disabled) [ 3.205834] pnp 00:1d: Plug and Play ACPI device, IDs PNP0501 (disabled) [ 3.205934] pnp 00:1e: Plug and Play ACPI device, IDs PNP0501 (disabled) [ 3.206018] pnp 00:1f: Plug and Play ACPI device, IDs PNP0501 (disabled) [ 3.206091] pnp 00:20: Plug and Play ACPI device, IDs PNP0501 (disabled) [ 3.206193] pnp 00:21: Plug and Play ACPI device, IDs PNP0501 (disabled) [ 3.206306] pnp 00:22: Plug and Play ACPI device, IDs PNP0501 (disabled) [ 3.206412] pnp 00:23: Plug and Play ACPI device, IDs PNP0501 (disabled) [ 3.206487] pnp 00:24: Plug and Play ACPI device, IDs PNP0501 (disabled) [ 3.206561] pnp 00:25: Plug and Play ACPI device, IDs PNP0501 (disabled) [ 3.206741] pnp 00:26: Plug and Play ACPI device, IDs PNP0501 (disabled) [ 3.218505] pnp 00:27: [io 0x0378-0x037f] [ 3.218522] pnp 00:27: [irq 7] [ 3.221718] pnp 00:27: Plug and Play ACPI device, IDs PNP0400 (active) [ 3.232376] pnp 00:28: [io 0x03f8-0x03ff] [ 3.232378] pnp 00:28: [irq 4] [ 3.235096] pnp 00:28: Plug and Play ACPI device, IDs PNP0501 (active) [ 3.243778] pnp 00:29: [io 0x02f8-0x02ff] [ 3.243781] pnp 00:29: [irq 3] [ 3.246648] pnp 00:29: Plug and Play ACPI device, IDs PNP0501 (active) [ 3.260120] pnp 00:2a: [io 0x03f0-0x03f5] [ 3.260122] pnp 00:2a: [io 0x03f7] [ 3.260177] pnp 00:2a: [irq 6] [ 3.260179] pnp 00:2a: [dma 2] [ 3.262958] pnp 00:2a: Plug and Play ACPI device, IDs PNP0700 (active) [ 3.263213] pnp 00:2b: [mem 0xe0000000-0xefffffff] [ 3.263216] pnp 00:2b: [io 0x1060-0x107f] [ 3.263217] pnp 00:2b: [mem 0xd0200000-0xd03fffff] [ 3.263319] system 00:2b: [io 0x1060-0x107f] has been reserved [ 3.263574] system 00:2b: [mem 0xe0000000-0xefffffff] has been reserved [ 3.263832] system 00:2b: [mem 0xd0200000-0xd03fffff] has been reserved [ 3.264142] system 00:2b: Plug and Play ACPI device, IDs PNP0c02 (active) [ 3.364026] pnp: PnP ACPI: found 44 devices [ 3.364286] ACPI: ACPI bus type pnp unregistered ... [ 3.760590] Serial: 8250/16550 driver, 32 ports, IRQ sharing enabled [ 3.796769] serial8250: ttyS0 at I/O 0x3f8 (irq = 4) is a 16550A [ 3.834878] serial8250: ttyS1 at I/O 0x2f8 (irq = 3) is a 16550A [ 3.870887] serial8250: ttyS2 at I/O 0x3e8 (irq = 4) is a 16550A [ 3.907029] serial8250: ttyS3 at I/O 0x2e8 (irq = 3) is a 16550A [ 4.055106] 00:09: ttyS2 at I/O 0x3e8 (irq = 4) is a 16550A [ 4.091062] 00:0a: ttyS3 at I/O 0x2e8 (irq = 3) is a 16550A [ 4.091500] serial 00:0b: [io 0x0500-0x0507] [ 4.091502] serial 00:0b: [irq 16] [ 4.093172] serial 00:0b: activated [ 4.129193] 00:0b: ttyS4 at I/O 0x500 (irq = 16) is a 16550A [ 4.131560] serial 00:0c: [io 0x0508-0x050f] [ 4.131564] serial 00:0c: [irq 16] [ 4.134258] serial 00:0c: activated [ 4.171465] 00:0c: ttyS5 at I/O 0x508 (irq = 16) is a 16550A [ 4.171863] serial 00:0d: [io 0x0510-0x0517] [ 4.171866] serial 00:0d: [irq 16] [ 4.172874] serial 00:0d: activated [ 4.208069] 00:0d: ttyS6 at I/O 0x510 (irq = 16) is a 16550A [ 4.211506] serial 00:0e: [io 0x0518-0x051f] [ 4.211509] serial 00:0e: [irq 16] [ 4.212381] serial 00:0e: activated [ 4.247520] 00:0e: ttyS7 at I/O 0x518 (irq = 16) is a 16550A [ 4.251484] serial 00:0f: [io 0x0520-0x0527] [ 4.251487] serial 00:0f: [irq 16] [ 4.252861] serial 00:0f: activated [ 4.288562] 00:0f: ttyS8 at I/O 0x520 (irq = 16) is a 16550A [ 4.291464] serial 00:10: [io 0x0528-0x052f] [ 4.291468] serial 00:10: [irq 16] [ 4.292372] serial 00:10: activated [ 4.328276] 00:10: ttyS9 at I/O 0x528 (irq = 16) is a 16550A [ 4.331437] serial 00:11: [io 0x0530-0x0537] [ 4.331440] serial 00:11: [irq 16] [ 4.332872] serial 00:11: activated [ 4.368472] 00:11: ttyS10 at I/O 0x530 (irq = 16) is a 16550A [ 4.371417] serial 00:12: [io 0x0538-0x053f] [ 4.371421] serial 00:12: [irq 16] [ 4.372341] serial 00:12: activated [ 4.407535] 00:12: ttyS11 at I/O 0x538 (irq = 16) is a 16550A [ 4.411396] serial 00:13: [io 0x0540-0x0547] [ 4.411399] serial 00:13: [irq 16] [ 4.412450] serial 00:13: activated [ 4.447610] 00:13: ttyS12 at I/O 0x540 (irq = 16) is a 16550A [ 4.451374] serial 00:14: [io 0x0548-0x054f] [ 4.451377] serial 00:14: [irq 16] [ 4.452862] serial 00:14: activated [ 4.488531] 00:14: ttyS13 at I/O 0x548 (irq = 16) is a 16550A [ 4.488870] serial 00:15: [io 0x0550-0x0557] [ 4.488872] serial 00:15: [irq 16] [ 4.489764] serial 00:15: activated [ 4.524757] 00:15: ttyS14 at I/O 0x550 (irq = 16) is a 16550A [ 4.527308] serial 00:16: [io 0x0558-0x055f] [ 4.527317] serial 00:16: [irq 16] [ 4.528355] serial 00:16: activated [ 4.563582] 00:16: ttyS15 at I/O 0x558 (irq = 16) is a 16550A [ 4.567290] serial 00:17: [io 0x0560-0x0567] [ 4.567293] serial 00:17: [irq 16] [ 4.568244] serial 00:17: activated [ 4.603384] 00:17: ttyS16 at I/O 0x560 (irq = 16) is a 16550A [ 4.607265] serial 00:18: [io 0x0568-0x056f] [ 4.607269] serial 00:18: [irq 16] [ 4.608248] serial 00:18: activated [ 4.643357] 00:18: ttyS17 at I/O 0x568 (irq = 16) is a 16550A [ 4.647248] serial 00:19: [io 0x0570-0x0577] [ 4.647251] serial 00:19: [irq 16] [ 4.648232] serial 00:19: activated [ 4.683824] 00:19: ttyS18 at I/O 0x570 (irq = 16) is a 16550A [ 4.687226] serial 00:1a: [io 0x0578-0x057f] [ 4.687229] serial 00:1a: [irq 16] [ 4.688242] serial 00:1a: activated [ 4.723181] 00:1a: ttyS19 at I/O 0x578 (irq = 16) is a 16550A [ 4.727204] serial 00:1b: [io 0x0580-0x0587] [ 4.727207] serial 00:1b: [irq 16] [ 4.728205] serial 00:1b: activated [ 4.763833] 00:1b: ttyS20 at I/O 0x580 (irq = 16) is a 16550A [ 4.767182] serial 00:1c: [io 0x0588-0x058f] [ 4.767185] serial 00:1c: [irq 16] [ 4.768285] serial 00:1c: activated [ 4.804636] 00:1c: ttyS21 at I/O 0x588 (irq = 16) is a 16550A [ 4.807171] serial 00:1d: [io 0x0590-0x0597] [ 4.807175] serial 00:1d: [irq 16] [ 4.808155] serial 00:1d: activated [ 4.844006] 00:1d: ttyS22 at I/O 0x590 (irq = 16) is a 16550A [ 4.847158] serial 00:1e: [io 0x0598-0x059f] [ 4.847162] serial 00:1e: [irq 16] [ 4.848172] serial 00:1e: activated [ 4.883544] 00:1e: ttyS23 at I/O 0x598 (irq = 16) is a 16550A [ 4.887160] serial 00:1f: [io 0x05a0-0x05a7] [ 4.887163] serial 00:1f: [irq 16] [ 4.888167] serial 00:1f: activated [ 4.923172] 00:1f: ttyS24 at I/O 0x5a0 (irq = 16) is a 16550A [ 4.927094] serial 00:20: [io 0x05a8-0x05af] [ 4.927097] serial 00:20: [irq 16] [ 4.928141] serial 00:20: activated [ 4.963413] 00:20: ttyS25 at I/O 0x5a8 (irq = 16) is a 16550A [ 4.967090] serial 00:21: [io 0x05b0-0x05b7] [ 4.967093] serial 00:21: [irq 16] [ 4.968149] serial 00:21: activated [ 5.003849] 00:21: ttyS26 at I/O 0x5b0 (irq = 16) is a 16550A [ 5.007034] serial 00:22: [io 0x05b8-0x05bf] [ 5.007036] serial 00:22: [irq 16] [ 5.008338] serial 00:22: activated [ 5.043447] 00:22: ttyS27 at I/O 0x5b8 (irq = 16) is a 16550A [ 5.047046] serial 00:23: [io 0x05c0-0x05c7] [ 5.047049] serial 00:23: [irq 16] [ 5.048136] serial 00:23: activated [ 5.083139] 00:23: ttyS28 at I/O 0x5c0 (irq = 16) is a 16550A [ 5.087020] serial 00:24: [io 0x05c8-0x05cf] [ 5.087059] serial 00:24: [irq 16] [ 5.088072] serial 00:24: activated [ 5.123729] 00:24: ttyS29 at I/O 0x5c8 (irq = 16) is a 16550A [ 5.127021] serial 00:25: [io 0x05d0-0x05d7] [ 5.127024] serial 00:25: [irq 16] [ 5.128499] serial 00:25: activated [ 5.163772] 00:25: ttyS30 at I/O 0x5d0 (irq = 16) is a 16550A [ 5.167196] serial 00:26: [io 0x05d8-0x05df] [ 5.167198] serial 00:26: [irq 16] [ 5.168223] serial 00:26: activated [ 5.203803] 00:26: ttyS31 at I/O 0x5d8 (irq = 16) is a 16550A [ 5.242964] 00:28: ttyS0 at I/O 0x3f8 (irq = 4) is a 16550A [ 5.282406] 00:29: ttyS1 at I/O 0x2f8 (irq = 3) is a 16550A
diff --git a/drivers/pnp/pnpacpi/rsparser.c b/drivers/pnp/pnpacpi/rsparser.c index 5be4a39..3243bf4 100644 --- a/drivers/pnp/pnpacpi/rsparser.c +++ b/drivers/pnp/pnpacpi/rsparser.c @@ -518,6 +518,47 @@ static __init void pnpacpi_parse_dma_option(struct pnp_dev *dev, pnp_register_dma_resource(dev, option_flags, map, flags); } +static __init void pnpacpi_gsi_option_to_irq(struct pnp_dev *dev, + pnp_irq_mask_t *map, + u32 gsi, + int triggering, + int polarity) +{ + int p, t; + int irq; + + /* GSI 0 is ignored. */ + if (!gsi) + return; + + /* + * In IO-APIC mode, accept interrupt only if its trigger/polarity + * matches with one already selected. + */ + if (!acpi_get_override_irq(gsi, &t, &p)) { + t = t ? ACPI_LEVEL_SENSITIVE : ACPI_EDGE_SENSITIVE; + p = p ? ACPI_ACTIVE_LOW : ACPI_ACTIVE_HIGH; + if (triggering != t || polarity != p) { + dev_warn(&dev->dev, "IRQ %d status %s, %s does not match override %s, %s\n", + gsi, triggering ? "edge" : "level", + polarity ? "low" : "high", + t ? "edge":"level", p ? "low":"high"); + return; + } + } + irq = acpi_register_gsi(&dev->dev, gsi, triggering, polarity); + if (irq < 0) + dev_err(&dev->dev, "ignoring IRQ %d option " + "(cannot be mapped to platform IRQ)\n", + gsi); + else if (irq < PNP_IRQ_NR) + __set_bit(irq, map->bits); + else + dev_err(&dev->dev, "ignoring IRQ %d (GSI %d) option " + "(too large for %d entry bitmap)\n", + irq, gsi, PNP_IRQ_NR); +} + static __init void pnpacpi_parse_irq_option(struct pnp_dev *dev, unsigned int option_flags, struct acpi_resource_irq *p) @@ -528,8 +569,8 @@ static __init void pnpacpi_parse_irq_option(struct pnp_dev *dev, bitmap_zero(map.bits, PNP_IRQ_NR); for (i = 0; i < p->interrupt_count; i++) - if (p->interrupts[i]) - __set_bit(p->interrupts[i], map.bits); + pnpacpi_gsi_option_to_irq(dev, &map, p->interrupts[i], + p->triggering, p->polarity); flags = irq_flags(p->triggering, p->polarity, p->sharable); pnp_register_irq_resource(dev, option_flags, &map, flags); @@ -544,16 +585,9 @@ static __init void pnpacpi_parse_ext_irq_option(struct pnp_dev *dev, unsigned char flags; bitmap_zero(map.bits, PNP_IRQ_NR); - for (i = 0; i < p->interrupt_count; i++) { - if (p->interrupts[i]) { - if (p->interrupts[i] < PNP_IRQ_NR) - __set_bit(p->interrupts[i], map.bits); - else - dev_err(&dev->dev, "ignoring IRQ %d option " - "(too large for %d entry bitmap)\n", - p->interrupts[i], PNP_IRQ_NR); - } - } + for (i = 0; i < p->interrupt_count; i++) + pnpacpi_gsi_option_to_irq(dev, &map, p->interrupts[i], + p->triggering, p->polarity); flags = irq_flags(p->triggering, p->polarity, p->sharable); pnp_register_irq_resource(dev, option_flags, &map, flags);