linux-kernel - Re: [PATCH v1 2/8] ACPI: bus: Rework printing debug messages on

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Message-ID: <20251219123319.00001e98@huawei.com>
Date: Fri, 19 Dec 2025 12:33:19 +0000
From: Jonathan Cameron <jonathan.cameron@...wei.com>
To: "Rafael J. Wysocki" <rafael@...nel.org>
CC: Linux ACPI <linux-acpi@...r.kernel.org>, LKML
	<linux-kernel@...r.kernel.org>, Linux PCI <linux-pci@...r.kernel.org>, Bjorn
 Helgaas <helgaas@...nel.org>, Srinivas Pandruvada
	<srinivas.pandruvada@...ux.intel.com>, Hans de Goede <hansg@...nel.org>,
	Mario Limonciello <mario.limonciello@....com>
Subject: Re: [PATCH v1 2/8] ACPI: bus: Rework printing debug messages on
 _OSC errors

On Thu, 18 Dec 2025 21:35:27 +0100
"Rafael J. Wysocki" <rafael@...nel.org> wrote:

> From: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
> 
> Instead of using one function, acpi_print_osc_error(), for printing a
> debug message and dumping the _OSC request data in one go, use
> acpi_handle_debug() directly for printing messages and a separate
> function called acpi_dump_osc_data() for dumping the _OSC request data
> after printing one or more of them.
> 
> This allows the message printing in the _OSC handling code to be
> organized so that the messages printed by it are easier to parse.
Hi Rafael,

Perhaps an example of the print to motivate this change clearly?
The absence of a guid on the error string line for instance may
or may not bother people. It's there in the dump but that comes
after the error print I think.

Thanks,

Jonathan


> 
> Also, use %pUL for UUID printing instead of printing UUIDs as strings
> and include the revision number into the dumped _OSC request data.
> 
> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
> ---
>  drivers/acpi/bus.c |   35 ++++++++++++++++-------------------
>  1 file changed, 16 insertions(+), 19 deletions(-)
> 
> --- a/drivers/acpi/bus.c
> +++ b/drivers/acpi/bus.c
> @@ -180,18 +180,15 @@ void acpi_bus_detach_private_data(acpi_h
>  }
>  EXPORT_SYMBOL_GPL(acpi_bus_detach_private_data);
>  
> -static void acpi_print_osc_error(acpi_handle handle,
> -				 struct acpi_osc_context *context, char *error)
> +static void acpi_dump_osc_data(acpi_handle handle, const guid_t *guid, int rev,
> +			       struct acpi_buffer *cap)
>  {
> +	u32 *capbuf = cap->pointer;
>  	int i;
>  
> -	acpi_handle_debug(handle, "(%s): %s\n", context->uuid_str, error);
> -
> -	pr_debug("_OSC request data:");
> -	for (i = 0; i < context->cap.length; i += sizeof(u32))
> -		pr_debug(" %x", *((u32 *)(context->cap.pointer + i)));
> -
> -	pr_debug("\n");
> +	for (i = 0; i < cap->length / sizeof(u32); i++)
> +		acpi_handle_debug(handle, "(%pUL, %d): capabilities DWORD %i: [%08x]\n",
> +				  guid, rev, i, capbuf[i]);
>  }
>  
>  #define OSC_ERROR_MASK 	(OSC_REQUEST_ERROR | OSC_INVALID_UUID_ERROR | \
> @@ -239,8 +236,8 @@ acpi_status acpi_run_osc(acpi_handle han
>  	out_obj = output.pointer;
>  	if (out_obj->type != ACPI_TYPE_BUFFER
>  		|| out_obj->buffer.length != context->cap.length) {
> -		acpi_print_osc_error(handle, context,
> -			"_OSC evaluation returned wrong type");
> +		acpi_handle_debug(handle, "_OSC evaluation returned wrong type");
> +		acpi_dump_osc_data(handle, &guid, context->rev, &context->cap);
>  		status = AE_TYPE;
>  		goto out_kfree;
>  	}
> @@ -252,18 +249,18 @@ acpi_status acpi_run_osc(acpi_handle han
>  
>  	if (errors) {
>  		if (errors & OSC_REQUEST_ERROR)
> -			acpi_print_osc_error(handle, context,
> -				"_OSC request failed");
> +			acpi_handle_debug(handle, "_OSC request failed");
> +
>  		if (errors & OSC_INVALID_UUID_ERROR)
> -			acpi_print_osc_error(handle, context,
> -				"_OSC invalid UUID");
> +			acpi_handle_debug(handle, "_OSC invalid UUID");
> +
>  		if (errors & OSC_INVALID_REVISION_ERROR)
> -			acpi_print_osc_error(handle, context,
> -				"_OSC invalid revision");
> +			acpi_handle_debug(handle, "_OSC invalid revision");
> +
>  		if (errors & OSC_CAPABILITIES_MASK_ERROR)
> -			acpi_print_osc_error(handle, context,
> -				"_OSC capability bits masked");
> +			acpi_handle_debug(handle, "_OSC capability bits masked");
>  
> +		acpi_dump_osc_data(handle, &guid, context->rev, &context->cap);
>  		status = AE_ERROR;
>  		goto out_kfree;
>  	}
> 
> 
> 
>