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Message-ID: <0ffb17e1-cb79-75fc-826f-e490bae79381@tuxedocomputers.com>
Date:   Mon, 21 Mar 2022 18:04:11 +0100
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Subject: Re: [PATCH v3 1/3] Input/i8042: Merge quirk tables
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To:     Hans de Goede <hdegoede@redhat.com>, dmitry.torokhov@gmail.com,
        tiwai@suse.de, mpdesouza@suse.com, arnd@arndb.de, samuel@cavoj.net,
        linux-input@vger.kernel.org, linux-kernel@vger.kernel.org
References: <20220308170523.783284-1-wse@tuxedocomputers.com>
 <20220308170523.783284-2-wse@tuxedocomputers.com>
 <e84d98e6-541d-8cc7-626e-f92d76230528@redhat.com>
 <e8fa9e33-f8af-d449-b357-6c6f310329ad@tuxedocomputers.com>
 <69901d1c-4e48-0bcc-7716-f1d88953968d@redhat.com>
From:   Werner Sembach <wse@tuxedocomputers.com>
In-Reply-To: <69901d1c-4e48-0bcc-7716-f1d88953968d@redhat.com>
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Am 21.03.22 um 15:51 schrieb Hans de Goede:
> Hi,
>
> On 3/21/22 15:25, Werner Sembach wrote:
>> Am 09.03.22 um 18:16 schrieb Hans de Goede:
>>> Hi,
>>>
>>> On 3/8/22 18:05, Werner Sembach wrote:
>>>> Merge i8042 quirk tables to reduce code duplication for devices that need
>>>> more than one quirk.
>>>>
>>>> Also align quirkable options with command line parameters and make vendor
>>>> wide quirks per device overwriteable on a per device basis.
>>>>
>>>> Some duplication on the ASUS devices is required to mirror the exact
>>>> behaviour of the previous code.
>>> Can you explain this a bit more ?
>> Yes, see next patch
> Next patch as in:
>
> https://lore.kernel.org/linux-input/20220308170523.783284-3-wse@tuxedocomputers.com/
>
> ? Or do you mean the next version of this patch-set ?
Next patch as in next revision of this patch set. Sorry for causing confusion.
>
>
>>>
>>>
>>>> Signed-off-by: Werner Sembach <wse@tuxedocomputers.com>
>>>> Cc: stable@vger.kernel.org
>>>> ---
>>>>  drivers/input/serio/i8042-x86ia64io.h | 1125 ++++++++++++++-----------
>>>>  1 file changed, 640 insertions(+), 485 deletions(-)
>>>>
>>>> diff --git a/drivers/input/serio/i8042-x86ia64io.h b/drivers/input/serio/i8042-x86ia64io.h
>>>> index 148a7c5fd0e2..689b9ee3e742 100644
>>>> --- a/drivers/input/serio/i8042-x86ia64io.h
>>>> +++ b/drivers/input/serio/i8042-x86ia64io.h
>>>> @@ -67,675 +67,821 @@ static inline void i8042_write_command(int val)
>>>>  
>>>>  #include <linux/dmi.h>
>>>>  
>>>> -static const struct dmi_system_id __initconst i8042_dmi_noloop_table[] = {
>>>> +#define SERIO_QUIRK_NOKBD		BIT(0)
>>>> +#define SERIO_QUIRK_NOAUX		BIT(1)
>>>> +#define SERIO_QUIRK_NOMUX		BIT(2)
>>>> +#define SERIO_QUIRK_FORCEMUX		BIT(3)
>>>> +#define SERIO_QUIRK_UNLOCK		BIT(4)
>>>> +#define SERIO_QUIRK_PROBE_DEFER		BIT(5)
>>>> +#define SERIO_QUIRK_RESET_ALWAYS	BIT(6)
>>>> +#define SERIO_QUIRK_RESET_NEVER		BIT(7)
>>>> +#define SERIO_QUIRK_DIECT		BIT(8)
>>>> +#define SERIO_QUIRK_DUMBKBD		BIT(9)
>>>> +#define SERIO_QUIRK_NOLOOP		BIT(10)
>>>> +#define SERIO_QUIRK_NOTIMEOUT		BIT(11)
>>>> +#define SERIO_QUIRK_KBDRESET		BIT(12)
>>>> +#define SERIO_QUIRK_DRITEK		BIT(13)
>>>> +#define SERIO_QUIRK_NOPNP		BIT(14)
>>>> +
>>>> +/* Quirk table for different mainboards. Options similar or identical to i8042
>>>> + * module parameters.
>>>> + * ORDERING IS IMPORTANT! The first match will be apllied and the rest ignored.
>>>> + * This allows entries to overwrite vendor wide quirks on a per device basis.
>>>> + * Where this is irrelevant, entries are sorted case sensitive by DMI_SYS_VENDOR
>>>> + * and/or DMI_BOARD_VENDOR to make it easier to avoid dublicate entries.
>>>> + */
>>>> +static const struct dmi_system_id i8042_dmi_quirk_table[] __initconst = {
>>> <snip>
>>>
>>>> @@ -1167,11 +1307,6 @@ static int __init i8042_pnp_init(void)
>>>>  	bool pnp_data_busted = false;
>>>>  	int err;
>>>>  
>>>> -#ifdef CONFIG_X86
>>>> -	if (dmi_check_system(i8042_dmi_nopnp_table))
>>>> -		i8042_nopnp = true;
>>>> -#endif
>>>> -
>>>>  	if (i8042_nopnp) {
>>>>  		pr_info("PNP detection disabled\n");
>>>>  		return 0;
>>> have you checked that i8042_platform_init() *always*
>>> gets called before i8042_pnp_init()?
>> As far as i can tell i8042_pnp_init() is only ever called inside i8042_platform_init() so moving this check from pnp
>> init to platform init should be no problem.
> Ok.
>
>>> Maybe just add something like this:
>>>
>>> #ifdef CONFIG_X86
>>> static void __init i8042_check_quirks(void)
>>> {
>>> 	const struct dmi_system_id *device_quirk_info;
>>> 	uintptr_t quirks;
>>>
>>> 	device_quirk_info = dmi_first_match(i8042_dmi_quirk_table);
>>> 	if (!device_quirk_info)
>>> 		return;
>>>
>>> 	quirks = (uintptr_t)device_quirk_info->driver_data;
>>>
>>> 	if (i8042_reset == I8042_RESET_DEFAULT) {
>>> 		if (quirks & SERIO_QUIRK_RESET)
>>> 			i8042_reset = I8042_RESET_ALWAYS;
>>> 		if (quirks & SERIO_QUIRK_NOSELFTEST)
>>> 			i8042_reset = I8042_RESET_NEVER;
>>> 	}
>>>
>>> 	/* Do more quirk checks */
>>> }
>>> #else
>>> static inline void i8042_check_quirks(void) {}
>>> #endif
>>>
>>> (above the declaration of i8042_pnp_init())
>>>
>>> And call i8042_check_quirks() in both
>>> i8042_platform_init() and i8042_platform_init() ?
>>>
>>> This also abstracts some of the CONFIG_X86
>>> ifdef-ery out of the other functions.
>>>
>>>
>>>> @@ -1277,6 +1412,9 @@ static inline void i8042_pnp_exit(void) { }
>>>>  
>>>>  static int __init i8042_platform_init(void)
>>>>  {
>>>> +	bool i8042_reset_always_quirk = false;
>>>> +	bool i8042_reset_never_quirk = false;
>>> I'm not a fan of these 2 helper variables, you can do this directly,
>>> see above.
>>>
>>>> +	const struct dmi_system_id *device_quirk_info;
>>> All 3 these variables will trigger unused variable
>>> settings when compiling without CONFIG_X86 set. Note
>>> introducing the i8042_check_quirks() helper as I suggest
>>> above avoids this without needing more #ifdef-ery.
>> Fixed by moving it to its own function as you suggested.
>>
>> My original reasoning for the helper variables was that i didn't want to move the i8042_reset evaluation, but then did
>> it anyways in the next patch after checking that pnp_init doesn't use the variable.
> Ok.
>
> Regards,
>
> Hans
>
>
>
>>>>  	int retval;
>>>>  
>>>>  #ifdef CONFIG_X86
>>>> @@ -1297,6 +1435,44 @@ static int __init i8042_platform_init(void)
>>>>  	i8042_kbd_irq = I8042_MAP_IRQ(1);
>>>>  	i8042_aux_irq = I8042_MAP_IRQ(12);
>>>>  
>>>> +#ifdef CONFIG_X86
>>>> +	device_quirk_info = dmi_first_match(i8042_dmi_quirk_table);
>>>> +	if (device_quirk_info) {
>>>> +		if ((uintptr_t)device_quirk_info->driver_data & SERIO_QUIRK_NOKBD)
>>>> +			i8042_nokbd = true;
>>>> +		if ((uintptr_t)device_quirk_info->driver_data & SERIO_QUIRK_NOAUX)
>>>> +			i8042_noaux = true;
>>>> +		if ((uintptr_t)device_quirk_info->driver_data & SERIO_QUIRK_NOMUX)
>>>> +			i8042_nomux = true;
>>>> +		if ((uintptr_t)device_quirk_info->driver_data & SERIO_QUIRK_FORCEMUX)
>>>> +			i8042_nomux = false;
>>>> +		if ((uintptr_t)device_quirk_info->driver_data & SERIO_QUIRK_UNLOCK)
>>>> +			i8042_unlock = true;
>>>> +		if ((uintptr_t)device_quirk_info->driver_data & SERIO_QUIRK_PROBE_DEFER)
>>>> +			i8042_probe_defer = true;
>>>> +		if ((uintptr_t)device_quirk_info->driver_data & SERIO_QUIRK_RESET_ALWAYS)
>>>> +			i8042_reset_always_quirk = true;
>>>> +		if ((uintptr_t)device_quirk_info->driver_data & SERIO_QUIRK_RESET_NEVER)
>>>> +			i8042_reset_never_quirk = true;
>>>> +		if ((uintptr_t)device_quirk_info->driver_data & SERIO_QUIRK_DIECT)
>>>> +			i8042_direct = true;
>>>> +		if ((uintptr_t)device_quirk_info->driver_data & SERIO_QUIRK_DUMBKBD)
>>>> +			i8042_dumbkbd = true;
>>>> +		if ((uintptr_t)device_quirk_info->driver_data & SERIO_QUIRK_NOLOOP)
>>>> +			i8042_noloop = true;
>>>> +		if ((uintptr_t)device_quirk_info->driver_data & SERIO_QUIRK_NOTIMEOUT)
>>>> +			i8042_notimeout = true;
>>>> +		if ((uintptr_t)device_quirk_info->driver_data & SERIO_QUIRK_KBDRESET)
>>>> +			i8042_kbdreset = true;
>>>> +		if ((uintptr_t)device_quirk_info->driver_data & SERIO_QUIRK_DRITEK)
>>>> +			i8042_dritek = true;
>>>> +#ifdef CONFIG_PNP
>>>> +		if ((uintptr_t)device_quirk_info->driver_data & SERIO_QUIRK_NOPNP)
>>>> +			i8042_nopnp = true;
>>>> +#endif
>>>> +	}
>>>> +#endif
>>>> +
>>>>  	retval = i8042_pnp_init();
>>>>  	if (retval)
>>>>  		return retval;
>>>> @@ -1308,34 +1484,13 @@ static int __init i8042_platform_init(void)
>>>>  #ifdef CONFIG_X86
>>>>  	/* Honor module parameter when value is not default */
>>>>  	if (i8042_reset == I8042_RESET_DEFAULT) {
>>>> -		if (dmi_check_system(i8042_dmi_reset_table))
>>>> +		if (i8042_reset_always_quirk)
>>>>  			i8042_reset = I8042_RESET_ALWAYS;
>>>>  
>>>> -		if (dmi_check_system(i8042_dmi_noselftest_table))
>>>> +		if (i8042_reset_never_quirk)
>>>>  			i8042_reset = I8042_RESET_NEVER;
>>>>  	}
>>>>  
>>>> -	if (dmi_check_system(i8042_dmi_noloop_table))
>>>> -		i8042_noloop = true;
>>>> -
>>>> -	if (dmi_check_system(i8042_dmi_nomux_table))
>>>> -		i8042_nomux = true;
>>>> -
>>>> -	if (dmi_check_system(i8042_dmi_forcemux_table))
>>>> -		i8042_nomux = false;
>>>> -
>>>> -	if (dmi_check_system(i8042_dmi_notimeout_table))
>>>> -		i8042_notimeout = true;
>>>> -
>>>> -	if (dmi_check_system(i8042_dmi_dritek_table))
>>>> -		i8042_dritek = true;
>>>> -
>>>> -	if (dmi_check_system(i8042_dmi_kbdreset_table))
>>>> -		i8042_kbdreset = true;
>>>> -
>>>> -	if (dmi_check_system(i8042_dmi_probe_defer_table))
>>>> -		i8042_probe_defer = true;
>>>> -
>>>>  	/*
>>>>  	 * A20 was already enabled during early kernel init. But some buggy
>>>>  	 * BIOSes (in MSI Laptops) require A20 to be enabled using 8042 to
>>> Regards,
>>>
>>> Hans
>>>
>>>
>> Regards,
>>
>> Werner
>>