linux-kernel - Re: [PATCH v1 4/8] ACPI: bus: Split _OSC error processing out of acpi_run

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Message-ID: <20251219124639.000031c5@huawei.com>
Date: Fri, 19 Dec 2025 12:46:39 +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 4/8] ACPI: bus: Split _OSC error processing out of
 acpi_run_osc()

On Thu, 18 Dec 2025 21:36:57 +0100
"Rafael J. Wysocki" <rafael@...nel.org> wrote:

> From: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
> 
> Split a function for processing _OSL errors called acpi_osc_error_check()
_OSC?
> out of acpi_run_osc() to facilitate subsequent changes.
> 
> No intentional functional impact.
> 
> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
Minor request inline. 
Reviewed-by: Jonathan Cameron <jonathan.cameron@...wei.com>
> ---
>  drivers/acpi/bus.c |   56 ++++++++++++++++++++++++++++++++++-------------------
>  1 file changed, 36 insertions(+), 20 deletions(-)
> 
> --- a/drivers/acpi/bus.c
> +++ b/drivers/acpi/bus.c
> @@ -236,13 +236,46 @@ static int acpi_eval_osc(acpi_handle han
>  	return 0;
>  }
>  
> +static bool acpi_osc_error_check(acpi_handle handle, guid_t *guid, int rev,
> +				 struct acpi_buffer *cap, u32 *retbuf)
> +{
> +	/* Bit 0 in the query DWORD of the return buffer is reserved. */
> +	u32 errors = retbuf[OSC_QUERY_DWORD] & OSC_ERROR_MASK;
> +	u32 *capbuf = cap->pointer;
> +
> +	/*
> +	 * If OSC_QUERY_ENABLE is set in the capabilities buffer, ignore bit 4.

Maybe add a tiny bit on why?

> +	 */
> +	if (capbuf[OSC_QUERY_DWORD] & OSC_QUERY_ENABLE)
> +		errors &= ~OSC_CAPABILITIES_MASK_ERROR;
> +
> +	if (!errors)
> +		return false;
> +
> +	if (errors & OSC_REQUEST_ERROR)
> +		acpi_handle_debug(handle, "_OSC: request failed\n");
> +
> +	if (errors & OSC_INVALID_UUID_ERROR)
> +		acpi_handle_debug(handle, "_OSC: invalid UUID\n");
> +
> +	if (errors & OSC_INVALID_REVISION_ERROR)
> +		acpi_handle_debug(handle, "_OSC: invalid revision\n");
> +
> +	if (errors & OSC_CAPABILITIES_MASK_ERROR)
> +		acpi_handle_debug(handle, "_OSC: capability bits masked\n");
> +
> +	acpi_dump_osc_data(handle, guid, rev, cap);
> +
> +	return true;
> +}

> 
>