[PATCH v2 0/4] of: Common "memory-region" parsing

[Rob Herring]

On Fri, Apr 25, 2025 at 6:34 PM Iuliana Prodan <iuliana.prodan at nxp.com> wrote:
>
> Hello Mathieu, Rob,
>
> I've tested imx_dsp_rproc and it fails with:
>
> [   39.743770] Unable to handle kernel paging request at virtual address
> ffffffffffffffea
> ...
> [   39.805078] Hardware name: NXP i.MX8MPlus EVK board (DT)
> [   39.810390] pstate: 00000005 (nzcv daif -PAN -UAO -TCO -DIT -SSBS
> BTYPE=--)
> [   39.817353] pc : __pi_memset_generic+0x50/0x188
> [   39.821892] lr : imx_dsp_rproc_prepare+0x3a4/0xea4 [imx_dsp_rproc]
> [   39.828079] sp : ffff8000853dbb10
> [   39.831396] x29: ffff8000853dbb90 x28: 0000000092400000 x27:
> ffff80007a36d3d8
> [   39.838540] x26: ffff0000d0a5e410 x25: ffff80007a36d3f0 x24:
> 0000000000000004
> [   39.845685] x23: ffff0000d5414880 x22: ffff0000d5e1dce8 x21:
> 0000000000000000
> [   39.852827] x20: ffff0000d5e1db98 x19: ffff0000d5414b80 x18:
> 00000000ffffffff
> [   39.859970] x17: 202c656c69687720 x16: 3e2074756f657672 x15:
> ffff800081f8d050
> [   39.867114] x14: ffff0000db584680 x13: 0000000000000003 x12:
> 00007fffa3330000
> [   39.874257] x11: 0000000000000004 x10: 0000000000000ab0 x9 :
> 0000000000000000
> [   39.881400] x8 : ffffffffffffffea x7 : 0000000000000000 x6 :
> 000000000000003f
> [   39.888546] x5 : 0000000000000040 x4 : 0000000000000006 x3 :
> 0000000000000004
> [   39.895689] x2 : 0000000000008000 x1 : 0000000000000000 x0 :
> ffffffffffffffea
> [   39.902837] Call trace:
> [   39.905284]  __pi_memset_generic+0x50/0x188 (P)
> [   39.909821]  rproc_boot+0x2c0/0x524
> [   39.913317]  state_store+0x40/0x100
> [   39.916812]  dev_attr_store+0x18/0x2c
> [   39.920478]  sysfs_kf_write+0x7c/0x94
> [   39.924146]  kernfs_fop_write_iter+0x120/0x1e8
> [   39.928598]  vfs_write+0x244/0x37c
> [   39.932008]  ksys_write+0x70/0x110
> [   39.935413]  __arm64_sys_write+0x1c/0x28
> [   39.939342]  invoke_syscall+0x48/0x104
> [   39.943094]  el0_svc_common.constprop.0+0xc0/0xe0
> [   39.947805]  do_el0_svc+0x1c/0x28
> [   39.951123]  el0_svc+0x30/0xcc
> [   39.954188]  el0t_64_sync_handler+0x10c/0x138
> [   39.958549]  el0t_64_sync+0x198/0x19c
> [   39.962222] Code: d65f03c0 cb0803e4 f2400c84 54000080 (a9001d07)
> [   39.968317] ---[ end trace 0000000000000000 ]---
>
> The problem seems to be when computing `cpu_addr =
> devm_ioremap_resource_wc(dev, &res);`, in patch 4.
> In `__devm_ioremap_resource` (see [1]), it's expecting the resource type
> to be `IORESOURCE_MEM`, which is not the case here (at least the flags
> are nowhere set for this).

Thanks for testing and diagnosing. IORESOURCE_MEM needs to be set. Can
you test with this change:

index f87915cce961..00c93585758f 100644
--- a/drivers/of/of_reserved_mem.c
+++ b/drivers/of/of_reserved_mem.c
@@ -771,6 +771,7 @@ int of_reserved_mem_region_to_resource(const
struct device_node *np,
                return -EINVAL;

        resource_set_range(res, rmem->base, rmem->size);
+       res->flags = IORESOURCE_MEM;
        res->name = rmem->name;
        return 0;
 }