linux-kernel - Re: [PATCH v4 3/3] remoteproc: imx_rproc: detect and attach to pre-booted remote cores

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Message-ID: <20250616160511.wynya4ezbj6nafkd@hiago-nb>
Date: Mon, 16 Jun 2025 13:05:11 -0300
From: Hiago De Franco <hiagofranco@...il.com>
To: Peng Fan <peng.fan@....com>
Cc: Mathieu Poirier <mathieu.poirier@...aro.org>,
	Ulf Hansson <ulf.hansson@...aro.org>,
	"linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
	"linux-remoteproc@...r.kernel.org" <linux-remoteproc@...r.kernel.org>,
	Shawn Guo <shawnguo@...nel.org>,
	Sascha Hauer <s.hauer@...gutronix.de>,
	Bjorn Andersson <andersson@...nel.org>,
	Hiago De Franco <hiago.franco@...adex.com>,
	"imx@...ts.linux.dev" <imx@...ts.linux.dev>,
	"linux-arm-kernel@...ts.infradead.org" <linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"Peng Fan (OSS)" <peng.fan@....nxp.com>,
	Daniel Baluta <daniel.baluta@....com>,
	"Iuliana Prodan (OSS)" <iuliana.prodan@....nxp.com>,
	"Rafael J . Wysocki" <rafael@...nel.org>
Subject: Re: [PATCH v4 3/3] remoteproc: imx_rproc: detect and attach to
 pre-booted remote cores

Hi Peng,

On Thu, Jun 12, 2025 at 02:03:17PM -0300, Hiago De Franco wrote:
> Hi Peng,
> 
> On Wed, Jun 11, 2025 at 03:27:09AM +0000, Peng Fan wrote:
> > > 
> > > Sorry for the delay.
> > > 
> > > I tested it now and there must be something missing on my U-Boot:
> > > 
> > > Disable imx8x-cm4 rsrc 278 not owned
> > > Disable imx8x-cm4 rsrc 297 not owned
> > > 
> > > It removes my nodes from the DT before starting the kernel, so I cannot
> > > attach. Do you know what should I do in this case?
> > 
> > In separate partition case, UBoot will check the permission
> > by checking the rsrc-id, saying power domain id.
> > 
> > You may need to remove the power-domains property
> > from M4 node.
> 
> Without the power-domains property, rproc gives me a kernel panic:
> 
> [    1.253234] remoteproc remoteproc0: imx-rproc is available
> [    1.258501] remoteproc remoteproc0: attaching to imx-rproc
> [    1.263950] Unable to handle kernel paging request at virtual address ffff80005ae57d39
> [    1.271812] Mem abort info:
> [    1.274575]   ESR = 0x0000000096000005
> [    1.278299]   EC = 0x25: DABT (current EL), IL = 32 bits
> [    1.282581] mmc0: SDHCI controller on 5b010000.mmc [5b010000.mmc] using ADMA
> [    1.283607]   SET = 0, FnV = 0
> [    1.293701]   EA = 0, S1PTW = 0
> [    1.296815]   FSC = 0x05: level 1 translation fault
> [    1.301699] Data abort info:
> [    1.304545]   ISV = 0, ISS = 0x00000005, ISS2 = 0x00000000
> [    1.310079]   CM = 0, WnR = 0, TnD = 0, TagAccess = 0
> [    1.315073]   GCS = 0, Overlay = 0, DirtyBit = 0, Xs = 0
> [    1.320367] swapper pgtable: 4k pages, 48-bit VAs, pgdp=0000000096bf3000
> [    1.327061] [ffff80005ae57d39] pgd=0000000000000000, p4d=1000000097085003, pud=0000000000000000
> [    1.335750] Internal error: Oops: 0000000096000005 [#1]  SMP
> [    1.341373] Modules linked in:
> [    1.344414] CPU: 3 UID: 0 PID: 47 Comm: kworker/u16:3 Not tainted 6.16.0-rc1-00024-gfe5d6ab20714-dirty
>  #857 PREEMPT
> [    1.354932] Hardware name: Toradex Colibri iMX8QXP on Colibri Evaluation Board V3 (DT)
> [    1.362837] Workqueue: events_unbound deferred_probe_work_func
> [    1.368651] pstate: 00000005 (nzcv daif -PAN -UAO -TCO -DIT -SSBS BTYPE=--)
> [    1.375601] pc : rproc_handle_resources.constprop.0+0x78/0x1d0
> [    1.381421] lr : rproc_boot+0x368/0x578
> [    1.385242] sp : ffff8000819f3990
> [    1.388542] x29: ffff8000819f3990 x28: ffff80005ae57d3d x27: 0000000000000000
> [    1.395671] x26: 0000000000000000 x25: ffff0000016ee038 x24: ffff800080f3c680
> [    1.402793] x23: ffff8000813d6da8 x22: 00000000d999ad39 x21: ffff0000016ee000
> [    1.409917] x20: 00000000266656c3 x19: ffff80005ae57d39 x18: 0000000000000006
> [    1.417040] x17: ffff000002020600 x16: ffff000002020000 x15: 4addd15cca11c529
> [    1.424164] x14: 73ebceed5d6cd787 x13: 4addd15cca11c529 x12: 73ebceed5d6cd787
> [    1.431288] x11: 95a4e33b6b190664 x10: 9e3cdabdb09ca345 x9 : ab3734eafdd6fd1c
> [    1.438412] x8 : d58a055de4cfb385 x7 : de97fab1791acbbe x6 : 9946d97107d0dcda
> [    1.445535] x5 : ffff0000032b2c00 x4 : 00000000000003fc x3 : ffff0000032b2b80
> [    1.452659] x2 : fffffffffffffff0 x1 : ffff8000814bd000 x0 : ffff8000814bd000
> [    1.459786] Call trace:
> [    1.462215]  rproc_handle_resources.constprop.0+0x78/0x1d0 (P)
> [    1.468036]  rproc_boot+0x368/0x578
> [    1.471510]  rproc_add+0x180/0x18c
> [    1.474898]  imx_rproc_probe+0x3e4/0x540
> [    1.475274] mmc0: new HS400 MMC card at address 0001
> [    1.478799]  platform_probe+0x68/0xc0
> [    1.484628] mmcblk0: mmc0:0001 Q2J55L 7.09 GiB
> [    1.487400]  really_probe+0xc0/0x38c
> [    1.487412]  __driver_probe_device+0x7c/0x15c
> [    1.487424]  driver_probe_device+0x3c/0x10c
> [    1.493941]  mmcblk0: p1 p2
> [    1.495392]  __device_attach_driver+0xbc/0x158
> [    1.495405]  bus_for_each_drv+0x84/0xe0
> [    1.495417]  __device_attach+0x9c/0x1ac
> [    1.500468] mmcblk0boot0: mmc0:0001 Q2J55L 16.0 MiB
> [    1.503906]  device_initial_probe+0x14/0x20
> [    1.503918]  bus_probe_device+0xac/0xb0
> [    1.503929]  deferred_probe_work_func+0x9c/0xec
> [    1.509863] mmcblk0boot1: mmc0:0001 Q2J55L 16.0 MiB
> [    1.511117]  process_one_work+0x14c/0x28c
> [    1.511132]  worker_thread+0x2cc/0x3d4
> [    1.511142]  kthread+0x12c/0x208
> [    1.511157]  ret_from_fork+0x10/0x20
> [    1.517964] mmcblk0rpmb: mmc0:0001 Q2J55L 4.00 MiB, chardev (241:0)
> [    1.518770] Code: 8b36c033 9100127c 54000924 d503201f (b9400261)
> [    1.518777] ---[ end trace 0000000000000000 ]---
> 
> Currently I have the M4 partiton defined into the SCU code:
> 
>             /* Create partition */
>             BRD_ERR(rm_partition_create(pt_boot, &pt_m4_0, SC_FALSE,
>                 SC_TRUE, SC_FALSE, SC_TRUE, SC_FALSE, SC_R_M4_0_PID0,
>                 rsrc_list, ARRAY_SIZE(rsrc_list),
>                 pad_list, ARRAY_SIZE(pad_list),
>                 NULL, 0));
> 
>             /* Name partition for debug */
>             PARTITION_NAME(pt_m4_0, "MCU0");
>             
>             /* Allow AP to use SYSTEM (not production!) */
>             BRD_ERR(rm_set_peripheral_permissions(SC_PT, SC_R_SYSTEM,
>                 pt_boot, SC_RM_PERM_SEC_RW));
> 
>             /* Move M4 0 TCM */
>             BRD_ERR(rm_find_memreg(pt_boot, &mr, 0x034FE0000ULL,
>                 0x034FE0000ULL));
>             BRD_ERR(rm_assign_memreg(pt_boot, pt_m4_0, mr));
> 
>             /* Move partition to be owned by SC */
>             BRD_ERR(rm_set_parent(pt_boot, pt_m4_0, SC_PT));
> 
>             /* Check if booting with the no_ap flag set */
>             if (no_ap != SC_FALSE)
>             {
>                 /* Move boot to be owned by M4 0 for Android Automotive */
>                 BRD_ERR(rm_set_parent(SC_PT, pt_boot, pt_m4_0));
>             }
>         }
> 
>         /* Allow all to access the SEMA42s */
>         BRD_ERR(rm_set_peripheral_permissions(SC_PT, SC_R_M4_0_SEMA42,
>             SC_RM_PT_ALL, SC_RM_PERM_FULL));
> 
> I believe this SCU code is correct, at least this is more or less what
> NXP provides as example, right?

I tested the same SCU code and DTS overlay (removing the power-domains)
with the current master branch of Linux and I got the same kernel panic.
Maybe this part is already broken? Can you also test this on your side
to check if this is currently working?

> 
> Best Regards,
> Hiago.

Best Regards,
Hiago.