IMR restore feature implementation #2989

keyonjie · 2021-06-10T11:11:34Z

This simply series implement the IMR restoring feature from the Linux side.

It is verified on cAVS platforms.

After switching to IMR restoring, the resuming boot time is decreased significantly:
e.g.

keyonjie · 2021-06-10T11:17:01Z

The corresponding FW PR here: thesofproject/sof#4320, though it is backward compatible so the 2 PRs can be merged separately.

@plbossart @ranj063 @kv2019i @bardliao please help to review.

The change here might be invasive as I don't add a kconfig item to enable/disable this new IMR restore feature, we can discuss if making it configurable is needed.

plbossart

Good idea to finally follow the recommended flows, but comments below.
Thanks @keyonjie for starting this.

plbossart · 2021-06-10T11:42:38Z

include/sound/sof/info.h

ABI change?

ABI change?

It is backward compatible, e.g. all FW/driver combination works, so I think we don't need ABI bump here:
old FW + old driver, no IMR restore.
old FW + new driver, no IMR restore.
new FW + old driver, driver FW purge IPC and re-downloading, no IMR restore.
new FW + new driver, IMR restore.

@keyonjie Yes, but it's still extending the public interface so
"Increment MINOR version if you add backwards compatible features or
changes. PATCH should be reset to 0." applies. https://github.com/thesofproject/sof/blob/main/src/include/kernel/abi.h

ment MINOR version if you add backwards compatible features or
changes. PATCH should be reset to 0.

OK, let me bump it to 3.19.0 then.

plbossart · 2021-06-10T11:50:50Z

sound/soc/sof/intel/hda-loader.c

lines 354..383 look like copy/paste. can we avoid this please? At the very least introduce helpers for SSP and SoundWire.

lines 354..383 look like copy/paste. can we avoid this please? At the very least introduce helpers for SSP and SoundWire.

Um, I thought about this, then I didn't want to change the sequence (e.g. to move SSP/SDW to the last) to introduce unexpected risk and that's why you see this...

Since you are confirming the SSP/SDW can be moved to the very last, let me share that part to avoid copy/paste here.

I am not confirming anything wrt SSP/SDW, you need to keep the same order as before, but call a helper. Having duplicated code and comments isn't good.

I am not confirming anything wrt SSP/SDW, you need to keep the same order as before, but call a helper. Having duplicated code and comments isn't good.

got you.

plbossart · 2021-06-10T11:51:49Z

sound/soc/sof/intel/hda-loader.c

what is the definition of 'first_boot' if we don't re-initialize the firmware?

what is the definition of 'first_boot' if we don't re-initialize the firmware?

We are only not re-downloading the firmware, the first/second/... FW boot concept are kept intact?

my point was: be careful and check for all usages of 'first boot'. In the past we would download and authenticate the firmware at every resume, now only at first boot. It's a legitimate question to revisit all usages of first_boot to make sure we don't forget about something.

my point was: be careful and check for all usages of 'first boot'. In the past we would download and authenticate the firmware at every resume, now only at first boot. It's a legitimate question to revisit all usages of first_boot to make sure we don't forget about something.

Got you, let me list all of those usages below to relax us about that.

The first_boot is initialize to be 'true' and changed to 'false' once the probing succeed in core.c, all remain usages of 'first boot' is reading:

in hda-loader.c, 3 usages:
hda-loader.c:406, hda_sdw_process_waken() called for resuming boot, kept unchanged in my PR.
hda-loader.c:463, 487, hda_sdw_startup() called at post_fw_run() for first boot only, I think we don't need it for resuming case, even we don't re-download the FW, @bardliao @RanderWang @plbossart can you help to confirm this?

in loader.c, we basically use first_boot to decide if requesting firmware, creating debugfs and parsing fw_ready message is needed, we still don't need those (as previous) with the change here.

in pm.c:100, first_boot is used to check if sof_resume() should be performed, if the first_boot is true, it means the probing was not succeed so sof_resume() still no needed.

in trace.c:485, first_boot is used for creating trace related debugfs entries, we don't need create them for resuming boot, this is not changed.

$ grep first_boot sound/soc/sof/* -rn sound/soc/sof/core.c:222: sdev->first_boot = false; sound/soc/sof/core.c:270: sdev->first_boot = true; sound/soc/sof/core.c:303: sdev->first_boot = true; sound/soc/sof/intel/hda-loader.c:406: if (!sdev->first_boot) sound/soc/sof/intel/hda-loader.c:463: if (sdev->first_boot) { sound/soc/sof/intel/hda-loader.c:487: if (sdev->first_boot) { sound/soc/sof/loader.c:66: if (sdev->first_boot) { sound/soc/sof/loader.c:190: if (sdev->first_boot) sound/soc/sof/loader.c:230: if (sdev->first_boot && elem->value) sound/soc/sof/loader.c:495: if (!sdev->first_boot) sound/soc/sof/loader.c:795: if (sdev->first_boot) { sound/soc/sof/pm.c:100: if (sdev->first_boot) sound/soc/sof/sof-priv.h:396: bool first_boot; sound/soc/sof/trace.c:485: if (sdev->first_boot) {

plbossart · 2021-06-10T11:55:06Z

sound/soc/sof/intel/hda-loader.c

what happens if we override this IMR_RESTORE configuration. Can we still go ahead and proceed with the default path?

This should be an opt-in solution IMHO. Changing the flows will mechanically lead to bugs, so by default users who upgrade the firmware should not see a change on how the DSP is managed.

what happens if we override this IMR_RESTORE configuration. Can we still go ahead and proceed with the default path?

Yes, if the driver choose to re-downloading, even the IMR_RESTORE is declared support from the fw_ready, we will still go ahead with today's path.

This should be an opt-in solution IMHO. Changing the flows will mechanically lead to bugs, so by default users who upgrade the firmware should not see a change on how the DSP is managed.

Um, that's what I commented above, do you suggest a kconfig item or a module param here?

@plbossart This can also fix issues, so not sure if this should be opt-in. If tests look good, we could just make this the default and offer an opt-out in case an issue is hit.

@kv2019i yes, that's what I meant, opt-out/disable similar to pm_runtime or dynamic pipelines.

So let me add a kconfig item and the check will be like this:

if ((sdev->fw_ready.flags & SOF_IPC_INFO_IMR_RESTORE) && !CONFIG_SND_SOC_SOF_DEBUG_DISABLE_IMR_RESTORE && !sdev->first_boot) {

@keyonjie @plbossart I'd vote for a module option. If this causes a regression, user can easily add a modprobe.d option, but having to roll out a custom kernel for a specific system is too difficult. And we have to too many Kconfig options. If there are many, we should have a quirk table in driver to make the default sane for most systems (as the module option is not scalable either).

agree with @kv2019i we already have sof_debug quirks as a module parameter, let's add one bit to disable IMR reload.

plbossart · 2021-06-10T11:57:29Z

sound/soc/sof/intel/hda-loader.c

On a similar note, when is the firmware preserved in IMR?
D3/S0 aka pm_runtime_suspend or RTD3?
D3/S3 aka system suspend/hibernate?

On a similar note, when is the firmware preserved in IMR?
D3/S0 aka pm_runtime_suspend or RTD3?
D3/S3 aka system suspend/hibernate?

Per my understanding, it is preserved in case the DDR is with power, so yes for both D3/S0 and D3/S3.

I am not quite sure about the S4 (Suspend-to-Disk) case though, what do you think about that?

That's for you to find out @keyonjie, and it goes back to my question on 'first-boot'. It's rather important to know when the IMR is preserved and when it's not.

That's for you to find out @keyonjie, and it goes back to my question on 'first-boot'. It's rather important to know when the IMR is preserved and when it's not.

Since I can't find a platform that support S4 hibernation at my end, will try this later.

kv2019i

Excellent @keyonjie ! I do think we need to to bump the minor version and we'd need to come up some way to rename the flag name. Either make it generic (IMR is Intel specific) or use some vendor specific method to pass info (ext-manifest). I think this is generally useful indication, so maybe we can just rename the flag.

kv2019i · 2021-06-11T06:04:46Z

include/sound/sof/info.h

@keyonjie Yes, but it's still extending the public interface so
"Increment MINOR version if you add backwards compatible features or
changes. PATCH should be reset to 0." applies. https://github.com/thesofproject/sof/blob/main/src/include/kernel/abi.h

kv2019i · 2021-06-11T08:51:22Z

sound/soc/sof/intel/hda-loader.c

@plbossart This can also fix issues, so not sure if this should be opt-in. If tests look good, we could just make this the default and offer an opt-out in case an issue is hit.

include/sound/sof/info.h

sound/soc/sof/intel/hda-loader.c

lyakh · 2021-06-15T06:33:11Z

sound/soc/sof/intel/hda-loader.c

IIRC the standard vocabulary has been updated?

IIRC the standard vocabulary has been updated?

Not quite sure if it has been updated for SDW part, @plbossart should I s/Slave/secondary ?

we'll to update later.

keyonjie · 2021-06-15T10:22:50Z

@kv2019i @plbossart @lyakh updated with most comments addressed.
Kconfig item not added as I want to get the alignment on that first.
S4 supporting not verified yet.

kv2019i

Looks good now. Only thing left is for us to agree on the opt-out mechanism. Currently patch has none, @keyonjie has proposed Kconfig and now made inline comment that I'd prefer a module parameter.

kv2019i · 2021-06-15T11:28:20Z

sound/soc/sof/intel/hda-loader.c

This will a very frequent and normal flow, so dev_info() is too verbose. Maybe dev_dbg() for this.

kv2019i · 2021-06-15T11:32:27Z

sound/soc/sof/intel/hda-loader.c

@keyonjie @plbossart I'd vote for a module option. If this causes a regression, user can easily add a modprobe.d option, but having to roll out a custom kernel for a specific system is too difficult. And we have to too many Kconfig options. If there are many, we should have a quirk table in driver to make the default sane for most systems (as the module option is not scalable either).

kv2019i · 2021-06-15T11:46:01Z

Removed "[RFC]" as this is no longer a draft.

keyonjie · 2021-06-16T06:43:46Z

@kv2019i @plbossart module option added.

keyonjie · 2021-06-16T07:02:16Z

SOFCI TEST

keyonjie · 2021-10-13T06:34:23Z

SOFCI TEST

keyonjie · 2021-10-13T07:37:25Z

SOFCI TEST

keyonjie · 2021-10-13T08:48:00Z

This need to go after FW PR thesofproject/sof#4386
please check the combined CI result in the test planresult 7341.

plbossart · 2021-11-04T23:16:44Z

sound/soc/sof/intel/hda-loader.c

@keyonjie I was not able to understand the difference with the first boot where this code is used

/* step 1: power up corex */ ret = hda_dsp_enable_core(sdev, chip->host_managed_cores_mask);

init_core_mask, enable_cores_mask, host_managed_cores_mask, that looks like a recipe for bugs.

@keyonjie I was not able to understand the difference with the first boot where this code is used

/* step 1: power up corex */ ret = hda_dsp_enable_core(sdev, chip->host_managed_cores_mask);

init_core_mask, enable_cores_mask, host_managed_cores_mask, that looks like a recipe for bugs.

It could be, but that is not introduced by this PR, no?

ranj063 · 2021-11-24T02:04:10Z

sound/soc/sof/intel/hda-loader.c

this is not needed. In fact it should be removed from hda_dsp_cl_boot_firmware() as well. snd_sof_run_firmware() already does it

this is not needed. In fact it should be removed from hda_dsp_cl_boot_firmware() as well. snd_sof_run_firmware() already does it

What you mentioned could be true, but that should belong to another PR? Here the PR is just following what the hda_dsp_cl_boot_firmware() does.

no I think we should remove it from here. We can remoe it from hda_dsp_cl_boot_firmware() in another PR

ranj063 · 2021-11-24T02:07:54Z

sound/soc/sof/intel/hda-loader.c

@keyonjie paranoia check here: I hope you have checked that this is OK to do i.e just power up the init_core_mask. When we download the fw, we power up all cores and then power down ~init_core_mask cores.

@keyonjie paranoia check here: I hope you have checked that this is OK to do i.e just power up the init_core_mask. When we download the fw, we power up all cores and then power down ~init_core_mask cores.

Yes, the CI test showed me that we actually don't need to power up other Cores not covered by init_core_mask.

@keyonjie you should base your results on the hardware recommended sequences, not experimental results from a small set of devices in the CI pool. That really doesn't inspire confidence if I'm honest.

@keyonjie you should base your results on the hardware recommended sequences, not experimental results from a small set of devices in the CI pool. That really doesn't inspire confidence if I'm honest.

That's a good point, I didn't find any hardware-recommended sequences mentioning that we have to power on all DSP cores at the booting, @ranj063 did you?

ranj063 · 2021-11-24T02:11:11Z

@keyonjie could you please run a daily test with this PR?

keyonjie · 2021-11-26T09:11:04Z

@ranj063 @plbossart looks it doesn't build anymore with simple rebasing, will work on it later.

ranj063 · 2021-12-01T04:38:13Z

@ranj063 @plbossart looks it doesn't build anymore with simple rebasing, will work on it later.

@keyonjie let us know when this is ready for review!

keyonjie · 2021-12-10T05:54:54Z

@ranj063 @plbossart ready for review now.

keyonjie · 2021-12-10T06:32:01Z

@ranj063 @plbossart @lgirdwood to test IMR restore feature, we need to config CONFIG_CAVS_IMR_D3_PERSISTENT for each platforms intended to use that, the CI test report is here:
https://sof-ci.sh.intel.com/#/result/planresultdetail/8827

you will see dmesg log "IMR restore supported, booting from IMR directly" which means IMR restore is used there.

lgirdwood · 2021-12-10T15:24:20Z

@mengdonglin are we able to test with this config from Keyon after v2/v1.9.3 validation is complete ?

ranj063 · 2021-12-12T17:21:55Z

include/sound/sof/info.h

Can you also fix the typos in the commit message: "Add a bit to denote if the FW supports the IMR..." and Firmware in all small-case in the second line.

include/sound/sof/info.h

ranj063 · 2021-12-12T17:26:13Z

sound/soc/sof/intel/hda-loader.c

typos in commit message: "Move the SSP DAI's slave mode set function to the hda_set_ssps_slave() helper and the SDW wakeen interrupt enabling to the hda_sdw_wakeen_resume() helper"

ranj063 · 2021-12-12T17:27:03Z

sound/soc/sof/intel/hda-loader.c

maybe call this function hda_ssp_resume()? then it will avoid using "slave" and it will leave the door open to move other things into it

Good suggestion, let me change them.

ranj063 · 2021-12-12T17:27:19Z

sound/soc/sof/intel/hda-loader.c

same here drop the wakeen from the function name

ranj063 · 2021-12-12T17:28:28Z

sound/soc/sof/intel/hda-loader.c

no I think we should remove it from here. We can remoe it from hda_dsp_cl_boot_firmware() in another PR

ranj063 · 2021-12-12T17:29:00Z

sound/soc/sof/intel/hda-loader.c

remover error prefix

yes, it could be superfluous, but aligns to all error prints in this file?

no we're slowly moving away from the error prefix. so no new ones please

fair, updated now.

ranj063 · 2021-12-12T17:32:03Z

sound/soc/sof/intel/hda-loader.c

you call it IMR restore support with no mention on it in the code anywhere. The code has only references to D3_PERSISTENT. Can we just stick to that in the commit messages as well so that reader don't get confused. Also I think PERSISTENT_D3 sounds more intuitive than D3_PERSISTENT. D3_PERSISTENT sounds like the D3 state will be persistent.

acutally if I read back my own comment, both of them convey the same message. Maybe we should call it IMR_PERSISTENT_D3 or something similar to say whats persistent in D3

Per my understanding, the IMR D3 persistency is our system behavior and should not be configurable, but either to use the IMR restoring feature or not is configurable.

Yes, the naming SOF_IPC_INFO_D3_PERSISTENT is somewhat confusing with respect to what I mentioned above, it should be SOF_IPC_INFO_IMR_RESTORE_SUPPORT, but since the naming is already quite long, and it needs to align to the existed FW side also, I would suggest keeping it at the moment and change it later from both side if needed.

Add a bit definition to the fw_ready message, to denote if the FW supports the IMR (Isolated Memory Region) restoring feature. If the bit is set, the driver can skip downloading the firmware again during system resume or runtime resume. Bump the ABI version to 3.19 to make it aligned with FW side. Signed-off-by: Keyon Jie <yang.jie@linux.intel.com>

Move the SSP slave mode set function to the hda_set_ssps_slave() helper and the SDW wakeen interrupt enabling to the hda_sdw_resume() helper, then these helpers can be shared to different callers later. Signed-off-by: Keyon Jie <yang.jie@linux.intel.com>

If the firmware declares the IMR restore feature, we only need to do a simple powering up for resuming from the suspended state, no firmware re-downloading needed. Add a helper hda_dsp_boot_imr() for this simple DSP rebooting, and use it when it is available. Signed-off-by: Keyon Jie <yang.jie@linux.intel.com>

Add flag _IGNORE_D3_PERSISTENT to disable IMR restore feature to the sof_debug module parameter. The IMR restore feature will be enabled for all Intel cAVS platforms by default, but setting the flag _IGNORE_D3_PERSISTENT can help to disable the feature for debug purpose, to rule out any possible regression introduced by the change of not re-downloading firmware to the DSP at resuming from suspended state. Signed-off-by: Keyon Jie <yang.jie@linux.intel.com>

keyonjie · 2021-12-14T06:35:11Z

the latest feature test result here: https://sof-ci.sh.intel.com/#/result/planresultdetail/8877

ranj063 · 2021-12-14T17:58:59Z

sound/soc/sof/intel/hda-loader.c

 	int ret, ret1, i;

 	if ((sdev->fw_ready.flags & SOF_IPC_INFO_D3_PERSISTENT) &&
+	    !(sof_debug_check_flag(SOF_DBG_IGNORE_D3_PERSISTENT)) &&


this patch has to be squashed with the previous one no? Because we'd enable it by default in the previous one and only disable it based on the module param in this one

my design here is to enable it by default if the FW claims it supports the feature. So this subsequent module param is only adding an interface to disable using the FW feature on the host side, for debugging purposes only.

ranj063

looks good @keyonjie. I'd like the lat 2 patches to still be squashed but I'll leave that for others to comment.

plbossart

minor comments below, the names for the new helpers are not very good and not aligned with the commit messages.

plbossart · 2021-12-15T23:39:26Z

sound/soc/sof/intel/hda-loader.c

-						 SSP_SET_SLAVE,
-						 SSP_SET_SLAVE);
-	}
+	hda_ssp_resume(sdev);


the commit message mentions a different name so that needs to be modified.

what was wrong with hda_set_ssps_slave()?

not inclusive

this calls SSP_SET_SLAVE...

I am all for inclusive terms, but this has nothing to do with resume operations.

this calls SSP_SET_SLAVE...

I am all for inclusive terms, but this has nothing to do with resume operations.

I think Ranjani means "what we need to perform to SSPs when resuming audio device (D3->D0)", like "_ssp_at_resume()". And, use the more generic _ssp_resume() will be friendly to add more SSP related reset/resume/init stuff into it in future when needed.

I am fine on both, just let me know the aligned one.

just because we do set_slave doesnt mean we have to name the function that too no? Someday maybe set_slave will get renamed and we wont have to worry about the static function name having the word"slave" in it. But I agree resume is a bad name. This is the loader, so while it is also called during resume, thats not the only thing. Why not call is something lika hda_ssp_cl_init() and hda_sdw_cl_init()

the acronym we came up with is CBP Codec BitClockProvider, so we can call this wrapper

hda_ssp_set_cbp()

if it also sets the fsync hda_ssp_set_cbp_cfp().

and no wrapper for SoundWire (see comment below) would be my preference.

sound/soc/sof/intel/hda-loader.c: SSP_SET_SLAVE,
sound/soc/sof/intel/hda-loader.c: SSP_SET_SLAVE);
sound/soc/sof/intel/hda.h:#define SSP_SET_SLAVE (SSP_SET_SCLK_SLAVE | SSP_SET_SFRM_SLAVE)

This should be SSP_SET_CBP_CFP

plbossart · 2021-12-15T23:38:49Z

sound/soc/sof/intel/hda-loader.c

-	 */
-	if (!sdev->first_boot)
-		hda_sdw_process_wakeen(sdev);
+	hda_sdw_resume(sdev);


we could move the !sdev->first_boot inside the helper, no need to add a new definition that's rather misleading.

we could move the !sdev->first_boot inside the helper, no need to add a new definition that's rather misleading.

checking sdev->first_boot inside hda_sdw_process_wakeen() sounds a bit odd to me, @plbossart do you really want that?

I actually don't see a need for a new wrapper here, just use

if (!sdev->first_boot)
hda_sdw_process_wakeen(sdev);

twice...

actually the imr stuff only happens after the first boot so the test is not needed ... really no need for a wrapper.

plbossart · 2021-12-15T23:43:40Z

sound/soc/sof/sof-priv.h

 							*/
 #define SOF_DBG_PRINT_ALL_DUMPS		BIT(6) /* Print all ipc and dsp dumps */
+#define SOF_DBG_IGNORE_D3_PERSISTENT		BIT(7) /* ignore the DSP D3 persistent capability
+							* and always do FW downloading at resume


and always download firmware upon D3 exit.

plbossart · 2021-12-16T19:36:30Z

I corrected my own comments in PR #3340, let's go from there. Thanks @keyonjie and fair winds to you.

keyonjie requested review from RanderWang, bardliao, juimonen, kv2019i, lgirdwood, lyakh, plbossart, ranj063 and slawblauciak June 10, 2021 11:11

keyonjie requested a review from libinyang as a code owner June 10, 2021 11:11

keyonjie mentioned this pull request Jun 10, 2021

IMR restore feature implementation thesofproject/sof#4320

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TGL: Chrome: cl_dsp_init: timeout HDA_DSP_SRAM_REG_ROM_STATUS read #2805

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keyonjie force-pushed the imr_restore branch from 4213b34 to b52d319 Compare June 15, 2021 10:21

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lgirdwood added the ABI involves ABI changes, need extra attention label Jun 15, 2021

kv2019i changed the title ~~[RFC] IMR restore feature implementation~~ IMR restore feature implementation Jun 15, 2021

lgirdwood added this to the ABI-319 milestone Jun 15, 2021

keyonjie force-pushed the imr_restore branch from b52d319 to b5fa524 Compare June 16, 2021 06:08

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IMR restore feature implementation #3340

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IMR restore feature implementation #2989

IMR restore feature implementation #2989

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keyonjie commented Jun 15, 2021

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keyonjie commented Jun 10, 2021 •

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plbossart Jun 11, 2021 •

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plbossart Jun 15, 2021 •

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