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Date: Thu, 11 Feb 2021 14:00:43 +0100
From: Geert Uytterhoeven <geert@...ux-m68k.org>
To: Saravana Kannan <saravanak@...gle.com>
Cc: Jonathan Corbet <corbet@....net>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
"Rafael J. Wysocki" <rafael@...nel.org>,
Kevin Hilman <khilman@...nel.org>,
Ulf Hansson <ulf.hansson@...aro.org>,
Len Brown <len.brown@...el.com>, Len Brown <lenb@...nel.org>,
Pavel Machek <pavel@....cz>,
Michael Turquette <mturquette@...libre.com>,
Stephen Boyd <sboyd@...nel.org>,
Rob Herring <robh+dt@...nel.org>,
Frank Rowand <frowand.list@...il.com>,
Marc Zyngier <maz@...nel.org>,
Thomas Gleixner <tglx@...utronix.de>,
"open list:DOCUMENTATION" <linux-doc@...r.kernel.org>,
Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
Linux PM list <linux-pm@...r.kernel.org>,
linux-clk <linux-clk@...r.kernel.org>,
"open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS"
<devicetree@...r.kernel.org>,
ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
Marek Szyprowski <m.szyprowski@...sung.com>,
Android Kernel Team <kernel-team@...roid.com>,
Linux-Renesas <linux-renesas-soc@...r.kernel.org>
Subject: Re: [PATCH v4 0/8] Make fw_devlink=on more forgiving
Hi Saravana,
On Fri, Feb 5, 2021 at 11:26 PM Saravana Kannan <saravanak@...gle.com> wrote:
> There are a lot of devices/drivers where they never have a struct device
> created for them or the driver initializes the hardware without ever
> binding to the struct device.
>
> This series is intended to avoid any boot regressions due to such
> devices/drivers when fw_devlink=on and also address the handling of
> optional suppliers.
>
> Patch 1 and 2 addresses the issue of firmware nodes that look like
> they'll have struct devices created for them, but will never actually
> have struct devices added for them. For example, DT nodes with a
> compatible property that don't have devices added for them.
>
> Patch 3 and 4 allow for handling optional DT bindings.
>
> Patch 5 sets up a generic API to handle drivers that never bind with
> their devices.
>
> Patch 6 through 8 update different frameworks to use the new API.
>
> Thanks,
> Saravana
>
> Saravana Kannan (8):
> driver core: fw_devlink: Detect supplier devices that will never be
> added
> of: property: Don't add links to absent suppliers
> driver core: Add fw_devlink.strict kernel param
> of: property: Add fw_devlink support for optional properties
> driver core: fw_devlink: Handle suppliers that don't use driver core
> irqdomain: Mark fwnodes when their irqdomain is added/removed
> PM: domains: Mark fwnodes when their powerdomain is added/removed
> clk: Mark fwnodes when their clock provider is added/removed
Thanks for your series, which is now part of driver-core-next.
I gave driver-core-next + [1] a try on various Renesas boards.
Test results are below.
In general, the result looks much better than before.
[1] - https://lore.kernel.org/lkml/20210210114435.122242-1-tudor.ambarus@microchip.com/
1. R-Car Gen2 (Koelsch), R-Car Gen3 (Salvator-X(S), Ebisu).
- Commit 2dfc564bda4a31bc ("soc: renesas: rcar-sysc: Mark device
node OF_POPULATED after init") is no longer needed (but already
queued for v5.12 anyway)
- Some devices are reprobed, despite their drivers returning
a real error code, and not -EPROBE_DEFER:
renesas_wdt e6020000.watchdog: Watchdog blacklisted on r8a7791 ES1.*
(rwdt_probe() returns -ENODEV)
sh-pfc e6060000.pinctrl: pin GP_7_23 already requested by
ee090000.pci; cannot claim for e6590000.usb
sh-pfc e6060000.pinctrl: pin-247 (e6590000.usb) status -22
sh-pfc e6060000.pinctrl: could not request pin 247
(GP_7_23) from group usb0 on device sh-pfc
renesas_usbhs e6590000.usb: Error applying setting,
reverse things back
renesas_usbhs: probe of e6590000.usb failed with error -22
rcar-pcie fe000000.pcie: host bridge /soc/pcie@...00000 ranges:
rcar-pcie fe000000.pcie: IO
0x00fe100000..0x00fe1fffff -> 0x0000000000
rcar-pcie fe000000.pcie: MEM
0x00fe200000..0x00fe3fffff -> 0x00fe200000
rcar-pcie fe000000.pcie: MEM
0x0030000000..0x0037ffffff -> 0x0030000000
rcar-pcie fe000000.pcie: MEM
0x0038000000..0x003fffffff -> 0x0038000000
rcar-pcie fe000000.pcie: IB MEM
0x0040000000..0x00bfffffff -> 0x0040000000
rcar-pcie fe000000.pcie: IB MEM
0x0200000000..0x02ffffffff -> 0x0200000000
rcar-pcie fe000000.pcie: PCIe link down
(rcar_pcie_probe() returns -ENODEV)
xhci-hcd ee000000.usb: xHCI Host Controller
xhci-hcd ee000000.usb: new USB bus registered, assigned bus number 7
xhci-hcd ee000000.usb: Direct firmware load for
r8a779x_usb3_v3.dlmem failed with error -2
xhci-hcd ee000000.usb: can't setup: -2
xhci-hcd ee000000.usb: USB bus 7 deregistered
xhci-hcd: probe of ee000000.usb failed with error -2
- The PCI reprobing leads to a memory leak, for which I've sent a fix
"[PATCH] PCI: Fix memory leak in pci_register_io_range()"
https://lore.kernel.org/linux-pci/20210202100332.829047-1-geert+renesas@glider.be/
- I2C on R-Car Gen3 does not seem to use DMA, according to
/sys/kernel/debug/dmaengine/summary:
-dma4chan0 | e66d8000.i2c:tx
-dma4chan1 | e66d8000.i2c:rx
-dma5chan0 | e6510000.i2c:tx
- Disabling CONFIG_IPMMU_VMSA (IOMMU) now works, good!
ignoring dependency for device, assuming no driver
- Disabling CONFIG_RCAR_DMAC works for most devices, except for
sound:
-rcar_sound ec500000.sound: probed
ALSA device list:
- #0: rcar-sound
+ No soundcards found.
# cat /sys/kernel/debug/devices_deferred
2-0010
sound
ec500000.sound
platform e6510000.i2c: Linked as a sync state only
consumer to ec500000.sound
platform ec500000.sound: Linked as a consumer to e6060000.pinctrl
platform ec500000.sound: Linked as a consumer to
e6150000.clock-controller
i2c 2-0010: Linked as a consumer to ec500000.sound
platform ec500000.sound: Linked as a consumer to 2-004f
cs2000-cp 2-004f: revision - C1
i2c-rcar e6510000.i2c: probed
i2c-rcar e6510000.i2c: Dropping the link to ec500000.sound
i2c 2-0010: probe deferral - supplier ec500000.sound not ready
With CONFIG_RCAR_DMAC=y, ec500000.sound is probed quite early.
arch/arm64/boot/dts/renesas/r8a77951-salvator-xs.dts
ak4613: codec@10 {
clocks = <&rcar_sound 3>;
port {
ak4613_endpoint: endpoint {
remote-endpoint = <&rsnd_endpoint0>;
};
};
};
sound_card: sound {
dais = <&rsnd_port0 /* ak4613 */
&rsnd_port1 /* HDMI0 */
&rsnd_port2>; /* HDMI1 */
};
rcar_sound: sound@...00000 {
ports {
rsnd_port0: port@0 {
rsnd_endpoint0: endpoint {
remote-endpoint =
<&ak4613_endpoint>;
}
}
}
};
2. SH/R-Mobile AG5 (kzm9g), APE6 (ape6evm), A1 (armadillo800-eva)
- "PATCH] soc: renesas: rmobile-sysc: Set OF_POPULATED and absorb
reset handling" is no longer needed
https://lore.kernel.org/linux-arm-kernel/20210205133319.1921108-1-geert+renesas@glider.be/
- On R-Mobile A1, I get a BUG and a memory leak:
BUG: spinlock bad magic on CPU#0, swapper/1
lock: lcdc0_device+0x10c/0x308, .magic: 00000000, .owner:
<none>/-1, .owner_cpu: 0
CPU: 0 PID: 1 Comm: swapper Not tainted
5.11.0-rc5-armadillo-00032-gf0a85c26907e #266
Hardware name: Generic R8A7740 (Flattened Device Tree)
[<c010c3c8>] (unwind_backtrace) from [<c010a49c>]
(show_stack+0x10/0x14)
[<c010a49c>] (show_stack) from [<c0159534>]
(do_raw_spin_lock+0x20/0x94)
[<c0159534>] (do_raw_spin_lock) from [<c04089d8>]
(dev_pm_get_subsys_data+0x30/0xa0)
[<c04089d8>] (dev_pm_get_subsys_data) from [<c0413698>]
(genpd_add_device+0x34/0x1c0)
[<c0413698>] (genpd_add_device) from [<c041389c>]
(of_genpd_add_device+0x34/0x4c)
[<c041389c>] (of_genpd_add_device) from [<c0a1e9bc>]
(board_staging_register_device+0xf8/0x118)
[<c0a1e9bc>] (board_staging_register_device) from
[<c0a1ea00>] (board_staging_register_devices+0x24/0x28)
[<c0a1ea00>] (board_staging_register_devices) from
[<c0a1ea30>] (runtime_board_check+0x2c/0x40)
[<c0a1ea30>] (runtime_board_check) from [<c0101fac>]
(do_one_initcall+0xe0/0x278)
[<c0101fac>] (do_one_initcall) from [<c0a01034>]
(kernel_init_freeable+0x174/0x1c0)
[<c0a01034>] (kernel_init_freeable) from [<c05fd568>]
(kernel_init+0x8/0x118)
[<c05fd568>] (kernel_init) from [<c010011c>]
(ret_from_fork+0x14/0x38)
Exception stack(0xc19c9fb0 to 0xc19c9ff8)
9fa0: 00000000
00000000 00000000 00000000
9fc0: 00000000 00000000 00000000 00000000 00000000
00000000 00000000 00000000
9fe0: 00000000 00000000 00000000 00000000 00000013 00000000
unreferenced object 0xc4134e00 (size 512):
comm "swapper", pid 1, jiffies 4294937296 (age 3541.930s)
hex dump (first 32 bytes):
00 4e 13 c4 00 4e 13 c4 ff ff ff 7f ff ff ff 7f
.N...N..........
ff ff ff 7f 02 00 00 00 00 5f 13 c4 1c 4e 13 c4
........._...N..
backtrace:
[<de1a3c34>] dev_pm_qos_constraints_allocate+0x10/0xcc
[<d21cf6e4>] dev_pm_qos_add_notifier+0x6c/0xd0
[<e04bbc90>] genpd_add_device+0x178/0x1c0
[<95067303>] of_genpd_add_device+0x34/0x4c
[<c334b97a>] board_staging_register_device+0xf8/0x118
[<01bd495a>] board_staging_register_devices+0x24/0x28
[<fb25a5d8>] runtime_board_check+0x2c/0x40
[<65aed679>] do_one_initcall+0xe0/0x278
[<97e3f4f7>] kernel_init_freeable+0x174/0x1c0
[<63c8fed0>] kernel_init+0x8/0x118
[<f704d96c>] ret_from_fork+0x14/0x38
[<00000000>] 0x0
3. RZ/A1 and RZ/A2: No issues.
Gr{oetje,eeting}s,
Geert
--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org
In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
-- Linus Torvalds
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