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Date: Thu, 8 Jun 2017 10:15:25 +0200
From: Oleksij Rempel <linux@...pel-privat.de>
To: Tobias Diedrich <ranma+ath9k_htc_fw@...edrich.de>,
Nathan Royce <nroycea+kernel@...il.com>,
QCA ath9k Development <ath9k-devel@....qualcomm.com>,
Kalle Valo <kvalo@...eaurora.org>,
linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
linux-kernel@...r.kernel.org,
ath9k_htc_fw <ath9k_htc_fw@...ts.infradead.org>
Subject: Re: ath9k_htc - Division by zero in kernel (as well as firmware
panic)
Am 08.06.2017 um 00:39 schrieb Tobias Diedrich:
> Oleksij Rempel wrote:
>> Am 07.06.2017 um 02:12 schrieb Tobias Diedrich:
>>> Oleksij Rempel wrote:
>>>> Yes, this is "normal" problem. The firmware has no error handler for PCI
>>>> bus related exceptions. So if we filed to read PCI bus first time, we
>>>> have choice to Ooops and stall or Ooops and reboot ASAP. So we reboot
>>>> and provide an kernel "firmware panic!" message.
>>>> Every one who can or will to fix this, is welcome.
>>>>
>>>>> *****
>>>>> Jun 02 14:55:30 computer kernel: usb 1-1.1: ath: firmware panic!
>>>>> exccause: 0x0000000d; pc: 0x0090ae81; badvaddr: 0x10ff4038.
>>> [...]
>>>
>>>> memdmp 50ae78 50ae88
>>>
>>> 50ae78: 6c10 0412 6aa2 0c02 0088 20c0 2008 1940 l...j..........@
>>>
>>> [...copy to bin...]
>>> $ bin/objdump -b binary -m xtensa -D /tmp/memdump.bin
>>> [..]
>>> 0: 6c1004 entry a1, 32
>>> 3: 126aa2 l32r a2, 0xfffdaa8c
>>> 6: 0c0200 memw
>>> 9: 8820 l32i.n a8, a2, 0 <----------Exception cause PC still points at load
>>> b: c020 movi.n a2, 0
>>> d: 081940 extui a9, a8, 1, 1
>>>
>>> Judging from that it should be fairly simple to at least implement
>>> some sort of retry, possible after triggering a PCIe link retrain?
>>
>> I assume, yes.
>>
>>> There are some related PCIe root complex registers that may point to
>>> what exactly failed if they were dumped.
>>>
>>> The root complex registers live at 0x00040000 and I think match the
>>> registers described for the root complex in the AR9344 datasheet.
>>
>> Suddenly I don't have ar7010 docs to tell..
>>
>>> PCIE_INT_MASK would map to 0x40050 and has a bit for SYS_ERR:
>>> "A system error. The RC Core asserts CFG_SYS_ERR_RC if any device in
>>> the hierarchy reports any of the following errors and the associated
>>> enable bit is set in the Root Control register: ERR_COR, ERR_FATAL,
>>> ERR_NONFATAL."
>>>
>>> AFAICS link retrain can be done by setting bit3 (INIT_RST,
>>> "Application request to initiate a training reset") in
>>> PCIE_APP (0x40000).
>>>
>>> See sboot/magpie_1_1/sboot/cmnos/eeprom/src/cmnos_eeprom.c (which
>>> flips some bits in the RC to enable the PCIe bus for reading the
>>> EEPROM).
>>>
>>> The root complex pci configuration space is at 0x20000 which could
>>> have further error details:
>>>> memdmp 20000 20200
>>>
>>> 020000: a02a 168c 0010 0006 0000 0001 0001 0000 .*..............
>>> 020010: 0000 0000 0000 0000 0000 0000 0000 0000 ................
>>> 020020: 0000 0000 0000 0000 0000 0000 0000 0000 ................
>>> 020030: 0000 0000 0000 0040 0000 0000 0000 01ff .......@........
>>> 020040: 5bc3 5001 0000 0000 0000 0000 0000 0000 [.P.............
>>> 020050: 0080 7005 0000 0000 0000 0000 0000 0000 ..p.............
>>> 020060: 0000 0000 0000 0000 0000 0000 0000 0000 ................
>>> 020070: 0042 0010 0000 8701 0000 2010 0013 4411 .B............D.
>>> 020080: 3011 0000 0000 0000 00c0 03c0 0000 0000 0...............
>>> 020090: 0000 0000 0000 0010 0000 0000 0000 0000 ................
>>> 0200a0: 0000 0000 0000 0000 0000 0000 0000 0000 ................
>>> 0200b0: 0000 0000 0000 0000 0000 0000 0000 0000 ................
>>> 0200c0: 0000 0000 0000 0000 0000 0000 0000 0000 ................
>>> 0200d0: 0000 0000 0000 0000 0000 0000 0000 0000 ................
>>> 0200e0: 0000 0000 0000 0000 0000 0000 0000 0000 ................
>>> 0200f0: 0000 0000 0000 0000 0000 0000 0000 0000 ................
>>> 020100: 1401 0001 0000 0000 0000 0000 0006 2030 ...............0
>>> 020110: 0000 0000 0000 2000 0000 00a0 0000 0000 ................
>>> 020120: 0000 0000 0000 0000 0000 0000 0000 0000 ................
>>> 020130: 0000 0000 0000 0000 0000 0000 0000 0000 ................
>>> 020140: 0001 0002 0000 0000 0000 0000 0000 0000 ................
>>> 020150: 0000 0000 8000 00ff 0000 0000 0000 0000 ................
>>> 020160: 0000 0000 0000 0000 0000 0000 0000 0000 ................
>>> 020170: 0000 0000 0000 0000 0000 0000 0000 0000 ................
>>> 020180: 0000 0000 0000 0000 0000 0000 0000 0000 ................
>>> 020190: 0000 0000 0000 0000 0000 0000 0000 0000 ................
>>> 0201a0: 0000 0000 0000 0000 0000 0000 0000 0000 ................
>>> 0201b0: 0000 0000 0000 0000 0000 0000 0000 0000 ................
>>> 0201c0: 0000 0000 0000 0000 0000 0000 0000 0000 ................
>>> 0201d0: 0000 0000 0000 0000 0000 0000 0000 0000 ................
>>> 0201e0: 0000 0000 0000 0000 0000 0000 0000 0000 ................
>>> 0201f0: 0000 0000 0000 0000 0000 0000 0000 0000 ................
>>>
>>> Transformed into something suitable for feeding into lspci -F:
>>>
>>> 00:00.0 Description filled in by lspci
>>> 00: 8c 16 2a a0 06 00 10 00 01 00 00 00 00 00 01 00
>>> 10: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>>> 20: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>>> 30: 00 00 00 00 40 00 00 00 00 00 00 00 ff 01 00 00
>>> 40: 01 50 c3 5b 00 00 00 00 00 00 00 00 00 00 00 00
>>> 50: 05 70 80 00 00 00 00 00 00 00 00 00 00 00 00 00
>>> 60: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>>> 70: 10 00 42 00 01 87 00 00 10 20 00 00 11 44 13 00
>>> 80: 00 00 11 30 00 00 00 00 c0 03 c0 00 00 00 00 00
>>> 90: 00 00 00 00 10 00 00 00 00 00 00 00 00 00 00 00
>>> a0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>>> b0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>>> c0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>>> d0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>>> e0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>>> f0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>>>
>>> $ lspci -F /tmp/hexdump -vvv
>>> 00:00.0 Non-VGA unclassified device: Qualcomm Atheros Device a02a (rev 01)
>>> !!! Invalid class 0000 for header type 01
>>> Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx-
>>> Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
>>> Latency: 0
>>> Interrupt: pin A routed to IRQ 255
>>> Bus: primary=00, secondary=00, subordinate=00, sec-latency=0
>>> I/O behind bridge: 00000000-00000fff
>>> Memory behind bridge: 00000000-000fffff
>>> Prefetchable memory behind bridge: 00000000-000fffff
>>> Secondary status: 66MHz- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- <SERR- <PERR-
>>> BridgeCtl: Parity- SERR- NoISA- VGA- MAbort- >Reset- FastB2B-
>>> PriDiscTmr- SecDiscTmr- DiscTmrStat- DiscTmrSERREn-
>>> Capabilities: [40] Power Management version 3
>>> Flags: PMEClk- DSI- D1+ D2- AuxCurrent=375mA PME(D0+,D1+,D2-,D3hot+,D3cold-)
>>> Status: D0 NoSoftRst- PME-Enable- DSel=0 DScale=0 PME-
>>> Capabilities: [50] MSI: Enable- Count=1/1 Maskable- 64bit+
>>> Address: 0000000000000000 Data: 0000
>>> Capabilities: [70] Express (v2) Root Port (Slot-), MSI 00
>>> DevCap: MaxPayload 256 bytes, PhantFunc 0
>>> ExtTag- RBE+
>>> DevCtl: Report errors: Correctable- Non-Fatal- Fatal- Unsupported-
>>> RlxdOrd+ ExtTag- PhantFunc- AuxPwr- NoSnoop-
>>> MaxPayload 128 bytes, MaxReadReq 512 bytes
>>> DevSta: CorrErr- UncorrErr- FatalErr- UnsuppReq- AuxPwr- TransPend-
>>> LnkCap: Port #0, Speed 2.5GT/s, Width x1, ASPM L0s, Exit Latency L0s <1us, L1 <64us
>>> ClockPM- Surprise- LLActRep+ BwNot- ASPMOptComp-
>>> LnkCtl: ASPM Disabled; RCB 64 bytes Disabled- CommClk-
>>> ExtSynch- ClockPM- AutWidDis- BWInt- AutBWInt-
>>> LnkSta: Speed 2.5GT/s, Width x1, TrErr- Train- SlotClk+ DLActive+ BWMgmt- ABWMgmt-
>>> RootCtl: ErrCorrectable- ErrNon-Fatal- ErrFatal- PMEIntEna- CRSVisible-
>>> RootCap: CRSVisible-
>>> RootSta: PME ReqID 0000, PMEStatus- PMEPending-
>>> DevCap2: Completion Timeout: Not Supported, TimeoutDis+, LTR-, OBFF Not Supported ARIFwd-
>>> DevCtl2: Completion Timeout: 50us to 50ms, TimeoutDis-, LTR-, OBFF Disabled ARIFwd-
>>> LnkCtl2: Target Link Speed: 2.5GT/s, EnterCompliance- SpeedDis-
>>> Transmit Margin: Normal Operating Range, EnterModifiedCompliance- ComplianceSOS-
>>> Compliance De-emphasis: -6dB
>>> LnkSta2: Current De-emphasis Level: -6dB, EqualizationComplete-, EqualizationPhase1-
>>> EqualizationPhase2-, EqualizationPhase3-, LinkEqualizationRequest-
>>>
>>
>> Looks promising :)
>>
>
> POC seems to work, though this may additionally need to restore wifi
> state as well, no guarantees there.
This probably will be next topic. Can you address some comments in the
review and create a pull request in the github repo?
>
>> str 40018 3
> 00040018 : 00000003
>>
> Retry(1) failed PCIe access @0x10ff4038
> Before: int_mask=0 app=ffc1 reset=0
> After: int_mask=0 app=ffc1 reset=7
> wlan int status=0
>
>> str 40018 3
> 00040018 : 00000003
>>
> Retry(1) failed PCIe access @0x10ff4038
> Before: int_mask=0 app=ffc1 reset=0
> After: int_mask=0 app=ffc1 reset=7
> wlan int status=0
>>
>
>
> diff --git a/target_firmware/magpie_fw_dev/target/init/app_start.c b/target_firmware/magpie_fw_dev/target/init/app_start.c
> index 8fa9c8b..fea62c1 100644
> --- a/target_firmware/magpie_fw_dev/target/init/app_start.c
> +++ b/target_firmware/magpie_fw_dev/target/init/app_start.c
> @@ -137,6 +137,13 @@ void __section(boot) __noreturn __visible app_start(void)
>
> A_PRINTF(" A_WDT_INIT()\n\r");
>
> +#if defined(PROJECT_MAGPIE)
please, use /**/ style comments.
> + // For some reason needs to be called again here for the
> + // exception handlers to work properly, at least on the XBOX
> + // adapter.
> + fatal_exception_func();
> +#endif
> +
> #if defined(PROJECT_K2)
> save_cmnos_printf = fw_cmnos_printf;
> #endif
> diff --git a/target_firmware/magpie_fw_dev/target/init/init.c b/target_firmware/magpie_fw_dev/target/init/init.c
> index 7484c05..cad2519 100755
> --- a/target_firmware/magpie_fw_dev/target/init/init.c
> +++ b/target_firmware/magpie_fw_dev/target/init/init.c
> @@ -212,6 +212,78 @@ LOCAL void zfGenWrongEpidEvent(uint32_t epid)
> mUSB_EP3_XFER_DONE();
> }
>
> +static void
> +AR7010_pcie_reset(void)
> +{
> +#define PCIE_RC_ACCESS_DELAY 20
> +
> +#define PCI_RC_RESET_BIT BIT6
> +#define PCI_RC_PHY_RESET_BIT BIT7
> +#define PCI_RC_PLL_RESET_BIT BIT8
> +#define PCI_RC_PHY_SHIFT_RESET_BIT BIT10
> +
> +#define HAL_WORD_REG_WRITE(addr, val) do { *((uint32_t*)(addr)) = val; } while (0)
> +#define HAL_WORD_REG_READ(addr) (*((uint32_t*)(addr)))
we already have iowrite32* ioread32* functions, why do we need more?
> +#define CMD_PCI_RC_RESET_ON() HAL_WORD_REG_WRITE(MAGPIE_REG_RST_RESET_ADDR, \
> + (HAL_WORD_REG_READ(MAGPIE_REG_RST_RESET_ADDR)| \
> + (PCI_RC_PHY_SHIFT_RESET_BIT|PCI_RC_PLL_RESET_BIT|PCI_RC_PHY_RESET_BIT|PCI_RC_RESET_BIT)))
> +
> +#define CMD_PCI_RC_RESET_CLR() HAL_WORD_REG_WRITE(MAGPIE_REG_RST_RESET_ADDR, \
> + (HAL_WORD_REG_READ(MAGPIE_REG_RST_RESET_ADDR)& \
> + (~(PCI_RC_PHY_SHIFT_RESET_BIT|PCI_RC_PLL_RESET_BIT|PCI_RC_PHY_RESET_BIT|PCI_RC_RESET_BIT))))
> +
> + int i;
> +
> + CMD_PCI_RC_RESET_ON();
> + A_DELAY_USECS(PCIE_RC_ACCESS_DELAY);
> +
> + /* dereset the reset */
> + CMD_PCI_RC_RESET_CLR();
> + A_DELAY_USECS(500);
> +
> + /* 7. set bus master and memory space enable */
> + DEBUG_SYSTEM_STATE = (DEBUG_SYSTEM_STATE&(~0xff)) | 0x45;
> + HAL_WORD_REG_WRITE(0x00020004, (HAL_WORD_REG_READ(0x00020004)|(BIT1|BIT2)));
> + A_DELAY_USECS(PCIE_RC_ACCESS_DELAY);
> +
> + /* 7.5. asser pcie_ep reset */
> + HAL_WORD_REG_WRITE(0x00040018, (HAL_WORD_REG_READ(0x00040018) & ~(0x1 << 2)));
> + A_DELAY_USECS(PCIE_RC_ACCESS_DELAY);
> +
> + /* 7.5. de-asser pcie_ep reset */
> + HAL_WORD_REG_WRITE(0x00040018, (HAL_WORD_REG_READ(0x00040018)|(0x1 << 2)));
> + A_DELAY_USECS(PCIE_RC_ACCESS_DELAY);
> +
> + /* 8. set app_ltssm_enable */
> + DEBUG_SYSTEM_STATE = (DEBUG_SYSTEM_STATE&(~0xff)) | 0x46;
> + HAL_WORD_REG_WRITE(0x00040000, (HAL_WORD_REG_READ(0x00040000)|0xffc1));
> +
> + /*!
> + * Receive control (PCIE_RESET),
> + * 0x40018, BIT0: LINK_UP, PHY Link up -PHY Link up/down indicator
> + * in case the link up is not ready and we access the 0x14000000,
> + * vmc will hang here
> + */
> +
> + /* poll 0x40018/bit0 (1000 times) until it turns to 1 */
> + i = 10000;
> + while(i-->0)
> + {
> + uint32_t reg_value = HAL_WORD_REG_READ(0x00040018);
> + if( reg_value & BIT0 )
> + break;
> + A_DELAY_USECS(PCIE_RC_ACCESS_DELAY);
> + }
> +
> + HAL_WORD_REG_WRITE(0x14000004, (HAL_WORD_REG_READ(0x14000004)|0x116));
> + A_DELAY_USECS(PCIE_RC_ACCESS_DELAY);
> +
> + HAL_WORD_REG_WRITE(0x14000010, (HAL_WORD_REG_READ(0x14000010)|EEPROM_CTRL_BASE));
> +}
> +
> +static int exception_retries = 0;
> +
> void
> AR6002_fatal_exception_handler_patch(CPU_exception_frame_t *exc_frame)
> {
> @@ -226,6 +298,32 @@ AR6002_fatal_exception_handler_patch(CPU_exception_frame_t *exc_frame)
> dump.pc = exc_frame->xt_pc;
> dump.assline = 0;
i would prefer to put it in to separate function. may be, complete pci
code in a separate file?
> + if (dump.badvaddr >= 0x10000000 &&
> + dump.badvaddr < 0x18000000) {
if (!bla)
return;
> + // Exception while accessing PCIe memory space.
> + volatile uint32_t *pcie_app = (uint32_t*) 0x40000;
> + volatile uint32_t *pcie_reset = (uint32_t*) 0x40018;
> + volatile uint32_t *pcie_int_mask = (uint32_t*) 0x40050;
magic values should be replaced.
> + // Maybe retry.
> + if (++exception_retries < 2) {
if (!bla)
return;
> + A_PRINTF("\nRetry(%d) failed PCIe access @0x%x\n",
> + exception_retries, dump.badvaddr);
> + A_PRINTF("Before: int_mask=%x app=%x reset=%x\n", *pcie_int_mask, *pcie_app, *pcie_reset);
> +
> + AR7010_pcie_reset();
> +
> + A_PRINTF("After: int_mask=%x app=%x reset=%x\n", *pcie_int_mask, *pcie_app, *pcie_reset);
> +
> + // This should recurse if we failed to recover.
> + A_PRINTF("wlan int status=%x\n", HAL_WORD_REG_READ(0x10ff4038));
> +
> + // Reset retry counter.
> + exception_retries = 0;
> + return;
> + }
> + }
> +
> zfGenExceptionEvent(dump.exc_frame.xt_exccause, dump.pc, dump.badvaddr);
>
> #if SYSTEM_MODULE_PRINT
I'm exciting to see it mainline. Thank you for your work!
--
Regards,
Oleksij
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