Re: Rock64 configuration fails to boot for main 22c4ab6cb015 but worked for main 06bd74e1e39c (Nov 21): e.MMC mishandled?
- Reply: Mark Millard via freebsd-arm : "Re: Rock64 configuration fails to boot for main 22c4ab6cb015 but worked for main 06bd74e1e39c (Nov 21): e.MMC mishandled?"
- In reply to: Mark Millard via freebsd-arm : "Re: Rock64 configuration fails to boot for main 22c4ab6cb015 but worked for main 06bd74e1e39c (Nov 21): e.MMC mishandled?"
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Date: Sun, 12 Dec 2021 08:59:13 UTC
On 2021-Dec-12, at 00:29, Mark Millard via freebsd-arm <freebsd-arm@freebsd.org> wrote:
> On 2021-Dec-11, at 16:19, Mark Millard <marklmi@yahoo.com> wrote:
>
>> [I've cut out the history: just presenting some new evidence.]
>>
>> First, a little context from getting to the db> prompt.
>>
>> db> ps
>> pid ppid pgrp uid state wmesg wchan cmd
>> 18 0 0 0 DL syncer 0xffff000000eca5a8 [syncer]
>> 17 0 0 0 DL vlruwt 0xffffa00007d2ea60 [vnlru]
>> 16 0 0 0 DL (threaded) [bufdaemon]
>> 100089 D qsleep 0xffff000000ec9478 [bufdaemon]
>> 100092 D - 0xffff000000c11100 [bufspacedaemon-0]
>> 100093 D - 0xffff000000c21680 [bufspacedaemon-1]
>> 9 0 0 0 DL psleep 0xffff000000ef0650 [vmdaemon]
>> 8 0 0 0 DL (threaded) [pagedaemon]
>> 100087 D psleep 0xffff000000ee2b38 [dom0]
>> 100094 D launds 0xffff000000ee2b44 [laundry: dom0]
>> 100095 D umarcl 0xffff0000007b38d8 [uma]
>> 7 0 0 0 DL mmcsd d 0xffffa00007b72e00 [mmcsd0boot1: mmc/sd]
>> 6 0 0 0 DL mmcsd d 0xffffa00007b71300 [mmcsd0boot0: mmc/sd]
>> 5 0 0 0 DL mmcreq 0xffff00009b5d0710 [mmcsd0: mmc/sd card]
>> 4 0 0 0 DL - 0xffff000000ccc020 [rand_harvestq]
>> 15 0 0 0 DL (threaded) [usb]
>> . . .
>>
>> and "mmcreq" is from the while loop in:
>>
>> static int
>> mmc_wait_for_req(struct mmc_softc *sc, struct mmc_request *req)
>> {
>>
>> req->done = mmc_wakeup;
>> req->done_data = sc;
>> if (__predict_false(mmc_debug > 1)) {
>> device_printf(sc->dev, "REQUEST: CMD%d arg %#x flags %#x",
>> req->cmd->opcode, req->cmd->arg, req->cmd->flags);
>> if (req->cmd->data) {
>> printf(" data %d\n", (int)req->cmd->data->len);
>> } else
>> printf("\n");
>> }
>> MMCBR_REQUEST(device_get_parent(sc->dev), sc->dev, req);
>> MMC_LOCK(sc);
>> while ((req->flags & MMC_REQ_DONE) == 0)
>> msleep(req, &sc->sc_mtx, 0, "mmcreq", 0);
>> MMC_UNLOCK(sc);
>> if (__predict_false(mmc_debug > 2 || (mmc_debug > 0 &&
>> req->cmd->error != MMC_ERR_NONE)))
>> device_printf(sc->dev, "CMD%d RESULT: %d\n",
>> req->cmd->opcode, req->cmd->error);
>> return (0);
>> }
>>
>> So it appears that the error report:
>>
>> mmcsd0: Error indicated: 4 Failed
>>
>> ends up associated with (req->flags & MMC_REQ_DONE) == 0 staying
>> true in the above code: an unbounded loop with MMC_LOCK(sc) active.
>> The "4" in the error report seems to be from:
>>
>> #define MMC_ERR_FAILED 4
>>
>> It looks like there are some problems with handling errors, problems
>> such that it gets stuck looping (no panic, no progress).
>>
>> That seems to be separate from why the MMC_ERR_FAILED was generated
>> in the first place. So: 2 problems, not just one. Thus it may be a
>> good context for tackling the looping problem with a known example
>> failure to look at.
>>
>>
>>
>> Just for reference, I tried "boot -v" with debug.verbose_sysinit=1 in place,
>> just to capture and report the tail of the output for the boot failure.
>>
>> . . .
>> subsystem f000000
>> release_aps(0)... Release APs...done
>> done.
>> intr_irq_shuffle(0)... Trying to mount root from ufs:/dev/gpt/Rock64root []...
>> done.
>> netisr_start(0)... done.
>> taskqgroup_bind_softirq(0)... done.
>> GEOM: new disk mmcsd0
>> GEOM: new disk mmcsd0boot0
>> GEOM: new disk mmcsd0boot1
>> smp_after_idle_runnable(0)... done.
>> taskqgroup_bind_if_config_tqg(0)... done.
>> taskqgroup_bind_if_io_tqg(0)... done.
>> tmr_setup_user_access(0)... done.
>> subsystem f000001
>> mmcsd0: Error indicated: 4 Failed
>> epoch_init_smp(0)... done.
>> subsystem f100000
>> racctd_init(0)... done.
>> subsystem fffffff
>> start_periodic_resettodr(0)... done.
>> oktousecallout(0)... done.
>> clknode_finish(0)... Unresolved linked clock found: hdmi_phy
>> Unresolved linked clock found: usb480m_phy
>> done.
>> regulator_constraint(0)... done.
>> regulator_shutdown(0)... regulator: shutting down unused regulators
>> regulator: shutting down vcc_sd... busy
>> done.
>> uhub0: 1 port with 1 removable, self powered
>> uhub2: 2 ports with 2 removable, self powered
>> uhub3: 1 port with 1 removable, self powered
>> uhub1: 1 port with 1 removable, self powered
>> ugen4.2: <Samsung PSSD T7 Touch> at usbus4
>> umass0 on uhub2
>> umass0: <Samsung PSSD T7 Touch, class 0/0, rev 3.20/1.00, addr 1> on usbus4
>> umass0: SCSI over Bulk-Only; quirks = 0x0000
>> umass0:0:0: Attached to scbus0
>> pass0 at umass-sim0 bus 0 scbus0 target 0 lun 0
>> pass0: <Samsung PSSD T7 Touch 0> Fixed Direct Access SPC-4 SCSI device
>> pass0: Serial Number REPLACED
>> pass0: 400.000MB/s transfers
>> da0 at umass-sim0 bus 0 scbus0 target 0 lun 0
>> da0: <Samsung PSSD T7 Touch 0> Fixed Direct Access SPC-4 SCSI device
>> da0: Serial Number REPLACED
>> da0: 400.000MB/s transfers
>> da0: 953869MB (1953525168 512 byte sectors)
>> da0: quirks=0x2<NO_6_BYTE>
>> da0: Delete methods: <NONE(*),ZERO>
>> random: unblocking device.
>>
>> No more output after that.
>
> As for why MMC_ERR_FAILED results, the following code diff is
> intended to suggest what I think may be incomplete about sticking
> to what the device-specific code supports vs. does not support
> (not supporting HS200 here). The code does compile in my context
> but is untested.
It is now tested (at least to be a useful hack): no longer am I
running an older 1400042 kernel. For reference,
# uname -apKU
FreeBSD Rock64_RPi_4_3_2v1p2 14.0-CURRENT FreeBSD 14.0-CURRENT #18 main-n251456-22c4ab6cb015-dirty: Sun Dec 12 00:34:53 PST 2021 root@CA72_16Gp_ZFS:/usr/obj/BUILDs/main-CA53-nodbg-clang/usr/main-src/arm64.aarch64/sys/GENERIC-NODBG-CA53 arm64 aarch64 1400043 1400043
And it reports during the boot (other than the "REPLACED"):
mmcsd0: 125GB <MMCHC DJNB4R 0.7 SN REPLACED MFG 06/2016 by 21 0x0000> at mmc0 52.0MHz/8bit/1016-block
So it no longer sets up a mode that the rk3328-specific-code does not
actually support.
(Nothing that I've done here deals with the looping issue when there
is a MMC_ERR_FAILED or the like.)
> The email handling may mess up some leading
> whitespace --but, again, I'm only trying to suggest a type of
> change.
>
> # git -C /usr/main-src/ diff /usr/main-src/sys/dev/mmc
> diff --git a/sys/dev/mmc/mmc.c b/sys/dev/mmc/mmc.c
> index 9c73dfd57ce0..dffd1c382684 100644
> --- a/sys/dev/mmc/mmc.c
> +++ b/sys/dev/mmc/mmc.c
> @@ -59,6 +59,7 @@ __FBSDID("$FreeBSD$");
> #include <sys/param.h>
> #include <sys/systm.h>
> #include <sys/kernel.h>
> +#include <sys/kobj.h>
> #include <sys/malloc.h>
> #include <sys/lock.h>
> #include <sys/module.h>
> @@ -1512,6 +1513,8 @@ mmc_timing_to_string(enum mmc_bus_timing timing)
> static bool
> mmc_host_timing(device_t dev, enum mmc_bus_timing timing)
> {
> + kobjop_desc_t kobj_desc;
> + kobj_method_t *kobj_method;
> int host_caps;
>
> host_caps = mmcbr_get_caps(dev);
> @@ -1543,14 +1546,37 @@ mmc_host_timing(device_t dev, enum mmc_bus_timing timing)
> case bus_timing_mmc_ddr52:
> return (HOST_TIMING_CAP(host_caps, MMC_CAP_MMC_DDR52));
> case bus_timing_mmc_hs200:
> - return (HOST_TIMING_CAP(host_caps, MMC_CAP_MMC_HS200_120) ||
> - HOST_TIMING_CAP(host_caps, MMC_CAP_MMC_HS200_180));
> case bus_timing_mmc_hs400:
> - return (HOST_TIMING_CAP(host_caps, MMC_CAP_MMC_HS400_120) ||
> - HOST_TIMING_CAP(host_caps, MMC_CAP_MMC_HS400_180));
> case bus_timing_mmc_hs400es:
> - return (HOST_TIMING_CAP(host_caps, MMC_CAP_MMC_HS400 |
> - MMC_CAP_MMC_ENH_STROBE));
> + /*
> + * Disable eMMC modes that require use of
> + * MMC_SEND_TUNING_BLOCK_HS200 to set things up if either the
> + * tune or re-tune method is the default NULL implementation.
> + */
> + kobj_desc = &mmcbr_tune_desc;
> + kobj_method = kobj_lookup_method(((kobj_t)dev)->ops->cls, NULL,
> + kobj_desc);
> + if (kobj_method == &kobj_desc->deflt)
> + return (false);
> + kobj_desc = &mmcbr_retune_desc;
> + kobj_method = kobj_lookup_method(((kobj_t)dev)->ops->cls, NULL,
> + kobj_desc);
> + if (kobj_method == &kobj_desc->deflt) {
> + return (false);
> + }
> +
> + /*
> + * Otherwise track the host capabilities.
> + */
> + if (timing == bus_timing_mmc_hs200)
> + return (HOST_TIMING_CAP(host_caps, MMC_CAP_MMC_HS200_120) ||
> + HOST_TIMING_CAP(host_caps, MMC_CAP_MMC_HS200_180));
> + if (timing == bus_timing_mmc_hs400)
> + return (HOST_TIMING_CAP(host_caps, MMC_CAP_MMC_HS400_120) ||
> + HOST_TIMING_CAP(host_caps, MMC_CAP_MMC_HS400_180));
> + if (timing == bus_timing_mmc_hs400es)
> + return (HOST_TIMING_CAP(host_caps, MMC_CAP_MMC_HS400 |
> + MMC_CAP_MMC_ENH_STROBE));
> }
>
> #undef HOST_TIMING_CAP
>
>
> In other words: have mmc_host_timing avoid returning true for some
> combinations that definitely do not have sufficient software support
> present at the time. (So far as I can tell, the rk3328's get the
> NULL-implementations as things are.)
>
> I expect that this sort of thing would go back to using
> MMC_CAP_MMC_DDR52 for the rk3328's, as an example. Working, but in a
> slower mode, the same mode as FreeBSD was previously using.
>
> A possible incompleteness in the suggestion is that there is also a
> drive-strength setting involved. If that also had "kobj" interfacing
> and NULL-implementation possibilities, then in the future there would
> be more to test for possibly forcing return-false than I did above.
>
> Hopefully this sort of thing would help, possibly more than just for
> rk3328's.
===
Mark Millard
marklmi at yahoo.com
( dsl-only.net went
away in early 2018-Mar)