On 1/12/23 09:40, Jorge Ramirez-Ortiz, Foundries wrote: > On 30/11/23 23:19:45, Jorge Ramirez-Ortiz, Foundries wrote: >> On 30/11/23 23:02:15, Jorge Ramirez-Ortiz, Foundries wrote: >>> On 30/11/23 21:12:28, Adrian Hunter wrote: >>>> On 30/11/23 15:24, Jorge Ramirez-Ortiz, Foundries wrote: >>>>> On 30/11/23 11:34:18, Ulf Hansson wrote: >>>>>> On Wed, 29 Nov 2023 at 17:05, Jorge Ramirez-Ortiz <jorge@xxxxxxxxxxxx> wrote: >>>>>>> >>>>>>> On the eMMC SanDisk iNAND 7250 configured with HS200, requesting a >>>>>>> re-tune before switching to the RPMB partition would randomly cause >>>>>>> subsequent RPMB requests to fail with EILSEQ: >>>>>>> * data error -84, tigggered in __mmc_blk_ioctl_cmd() >>>>>>> >>>>>>> This commit skips the retune when switching to RPMB. >>>>>>> Tested over several days with per minute RPMB reads. >>>>>> >>>>>> This sounds weird to me and needs more testing/debugging in my >>>>>> opinion, especially at the host driver level. Perhaps add some new >>>>>> tests in mmc_test, that does a partition switch to/from any partition >>>>>> and then run regular I/O again to see if the problem is easier to >>>>>> reproduce? >>>>> >>>>> hi Uffe >>>>> >>>>> ok I'll have a look - I have never used this driver before, so if you >>>>> have anything in the works I'll be glad to integrated and adapt. >>>>> >>>>>> >>>>>> The point is, I wonder what is so special with RPMB here? Note that, >>>>>> it has been quite common that host drivers/controllers have had issues >>>>>> with their tuning support, so I would not be surprised if that is the >>>>>> case here too. >>>>> >>>>> Right, it is just that the tuning function for of-arasan is the generic >>>>> __sdhci_execute_tuning() - only wrapped around arasan DLL reset >>>>> calls. Hence why I aimed for the card: __sdhci_execute_tuning and ZynqMP >>>>> are not recent functions or architectures. >>>>> >>>>> >>>>>> Certainly I would be surprised if the problem is at >>>>>> the eMMC card side, but I may be wrong. >>>>> >>>>> How do maintainers test the tuning methods? is there anything else for >>>>> me to do other than forcing a retune with different partitions? >>>>> >>>>>> >>>>>> Kind regards >>>>>> Uffe >>>>> >>>>> For completeness this is the error message - notice that we have a >>>>> trusted application (fiovb) going through OP-TEE and back to the TEE >>>>> supplicant issuing an rpmb read of a variable (pretty normal these days, >>>>> we use it on many different platforms - ST, NXP, AMD/Xilinx, TI..). >>>>> >>>>> The issue on this Zynqmp platform is scarily simple to reproduce; you >>>>> can ignore the OP-TEE trace, it is just the TEE way of reporting that >>>>> the RPMB read failed. >>>>> >>>>> root@uz3cg-dwg-sec:/var/rootdirs/home/fio# fiovb_printenv m4hash >>>>> [ 461.775084] sdhci-arasan ff160000.mmc: __mmc_blk_ioctl_cmd: data error -84 >>>>> E/TC:? 0 >>>>> E/TC:? 0 TA panicked with code 0xffff0000 >>>>> E/LD: Status of TA 22250a54-0bf1-48fe-8002-7b20f1c9c9b1 >>>>> E/LD: arch: aarch64 >>>>> E/LD: region 0: va 0xc0004000 pa 0x7e200000 size 0x002000 flags rw-s (ldelf) >>>>> E/LD: region 1: va 0xc0006000 pa 0x7e202000 size 0x008000 flags r-xs (ldelf) >>>>> E/LD: region 2: va 0xc000e000 pa 0x7e20a000 size 0x001000 flags rw-s (ldelf) >>>>> E/LD: region 3: va 0xc000f000 pa 0x7e20b000 size 0x004000 flags rw-s (ldelf) >>>>> E/LD: region 4: va 0xc0013000 pa 0x7e20f000 size 0x001000 flags r--s >>>>> E/LD: region 5: va 0xc0014000 pa 0x7e22c000 size 0x005000 flags rw-s (stack) >>>>> E/LD: region 6: va 0xc0019000 pa 0x816b31fc8 size 0x001000 flags rw-- (param) >>>>> E/LD: region 7: va 0xc001a000 pa 0x816aa1fc8 size 0x002000 flags rw-- (param) >>>>> E/LD: region 8: va 0xc006b000 pa 0x00001000 size 0x014000 flags r-xs [0] >>>>> E/LD: region 9: va 0xc007f000 pa 0x00015000 size 0x008000 flags rw-s [0] >>>>> E/LD: [0] 22250a54-0bf1-48fe-8002-7b20f1c9c9b1 @ 0xc006b000 >>>>> E/LD: Call stack: >>>>> E/LD: 0xc006de58 >>>>> E/LD: 0xc006b388 >>>>> E/LD: 0xc006ed40 >>>>> E/LD: 0xc006b624 >>>>> Read persistent value for m4hash failed: Exec format error >>>> >>>> Have you tried dynamic debug for mmc >>>> >>>> Kernel must be configured: >>>> >>>> CONFIG_DYNAMIC_DEBUG=y >>>> >>>> To enable mmc debug via sysfs: >>>> >>>> echo 'file drivers/mmc/core/* +p' > /sys/kernel/debug/dynamic_debug/control >>>> echo 'file drivers/mmc/host/* +p' > /sys/kernel/debug/dynamic_debug/control >>>> >>>> >>> >>> hi Adrian >>> >>> Sure, this is the output of the trace: >>> >>> [ 422.018756] mmc0: sdhci: IRQ status 0x00000020 >>> [ 422.018789] mmc0: sdhci: IRQ status 0x00000020 >>> [ 422.018817] mmc0: sdhci: IRQ status 0x00000020 >>> [ 422.018848] mmc0: sdhci: IRQ status 0x00000020 >>> [ 422.018875] mmc0: sdhci: IRQ status 0x00000020 >>> [ 422.018902] mmc0: sdhci: IRQ status 0x00000020 >>> [ 422.018932] mmc0: sdhci: IRQ status 0x00000020 >>> [ 422.020013] mmc0: sdhci: IRQ status 0x00000001 >>> [ 422.020027] mmc0: sdhci: IRQ status 0x00000002 >>> [ 422.020034] mmc0: req done (CMD6): 0: 00000800 00000000 00000000 00000000 >>> [ 422.020054] mmc0: starting CMD13 arg 00010000 flags 00000195 >>> [ 422.020068] mmc0: sdhci: IRQ status 0x00000001 >>> [ 422.020076] mmc0: req done (CMD13): 0: 00000900 00000000 00000000 00000000 >>> [ 422.020092] <mmc0: starting CMD23 arg 00000001 flags 00000015> >>> [ 422.020101] mmc0: starting CMD25 arg 00000000 flags 00000035 >>> [ 422.020108] mmc0: blksz 512 blocks 1 flags 00000100 tsac 400 ms nsac 0 >>> [ 422.020124] mmc0: sdhci: IRQ status 0x00000001 >>> [ 422.021671] mmc0: sdhci: IRQ status 0x00000002 >>> [ 422.021691] mmc0: req done <CMD23>: 0: 00000000 00000000 00000000 00000000 >>> [ 422.021700] mmc0: req done (CMD25): 0: 00000900 00000000 00000000 00000000 >>> [ 422.021708] mmc0: 512 bytes transferred: 0 >>> [ 422.021728] mmc0: starting CMD13 arg 00010000 flags 00000195 >>> [ 422.021743] mmc0: sdhci: IRQ status 0x00000001 >>> [ 422.021752] mmc0: req done (CMD13): 0: 00000900 00000000 00000000 00000000 >>> [ 422.021771] <mmc0: starting CMD23 arg 00000001 flags 00000015> >>> [ 422.021779] mmc0: starting CMD18 arg 00000000 flags 00000035 >>> [ 422.021785] mmc0: blksz 512 blocks 1 flags 00000200 tsac 100 ms nsac 0 >>> [ 422.021804] mmc0: sdhci: IRQ status 0x00000001 >>> [ 422.022566] mmc0: sdhci: IRQ status 0x00208000 <---------------------------------- this doesnt seem right >>> [ 422.022629] mmc0: req done <CMD23>: 0: 00000000 00000000 00000000 00000000 >>> [ 422.022639] mmc0: req done (CMD18): 0: 00000900 00000000 00000000 00000000 >>> [ 422.022647] mmc0: 0 bytes transferred: -84 < --------------------------------- it should have transfered 4096 bytes >>> [ 422.022669] sdhci-arasan ff160000.mmc: __mmc_blk_ioctl_cmd: data error -84 >>> [ 422.029619] mmc0: starting CMD6 arg 03b30001 flags 0000049d >>> [ 422.029636] mmc0: sdhci: IRQ status 0x00000001 >>> [ 422.029652] mmc0: sdhci: IRQ status 0x00000002 >>> [ 422.029660] mmc0: req done (CMD6): 0: 00000800 00000000 00000000 00000000 >>> [ 422.029680] mmc0: starting CMD13 arg 00010000 flags 00000195 >>> [ 422.029693] mmc0: sdhci: IRQ status 0x00000001 >>> [ 422.029702] mmc0: req done (CMD13): 0: 00000900 00000000 00000000 00000000 >>> [ 422.196996] <mmc0: starting CMD23 arg 00000400 flags 00000015> >>> [ 422.197051] mmc0: starting CMD25 arg 058160e0 flags 000000b5 >>> [ 422.197079] mmc0: blksz 512 blocks 1024 flags 00000100 tsac 400 ms nsac 0 >>> [ 422.197110] mmc0: CMD12 arg 00000000 flags 0000049d >>> [ 422.199455] mmc0: sdhci: IRQ status 0x00000020 >>> [ 422.199526] mmc0: sdhci: IRQ status 0x00000020 >>> [ 422.199585] mmc0: sdhci: IRQ status 0x00000020 >>> [ 422.199641] mmc0: sdhci: IRQ status 0x00000020 >>> [ 422.199695] mmc0: sdhci: IRQ status 0x00000020 >>> [ 422.199753] mmc0: sdhci: IRQ status 0x00000020 >>> [ 422.199811] mmc0: sdhci: IRQ status 0x00000020 >>> [ 422.199865] mmc0: sdhci: IRQ status 0x00000020 >>> [ 422.199919] mmc0: sdhci: IRQ status 0x00000020 >>> [ 422.199972] mmc0: sdhci: IRQ status 0x00000020 >>> [ 422.200026] mmc0: sdhci: IRQ status 0x00000020 >>> >>> >>> does this help? > > Just asking because it doesn't mean much to me other than the obvious CRC > problem. > > Being this issue so easy to trigger - and to fix - indicates a problem > on the card more than on the algorithm (otherwise faults would be all > over the place). But I am not an expert on this area. > > any additional suggestions welcome. My guess is that sometimes tuning produces a "bad" result. Perhaps the margins are very tight and the difference is only 1 tap. When a "bad" result happens in non-RPMB, a CRC error results in re-tuning and retry, so no errors are seen. When it happens in RPMB, that is not possible, so the error is obvious. Not re-tuning before RPMB switch helps because the CRC-error->re-tuning to a "good" result has probably already happened. However, based on that theory, it is not necessary the eMMC that is at fault. It may be worth considering a stronger eMMC driver strength setting. sdhci supports err_stats in debugfs - that may show how many CRC errors there are when not accessing RPMB. I don't object to skipping re-tuning before RPMB switch, but I am not sure about tying it to a specific eMMC.
