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Date: Fri, 08 Feb 2019 12:34:41 +0100
From: "Rafael J. Wysocki" <rjw@...ysocki.net>
To: Christoph Hellwig <hch@....de>
Cc: lenb@...nel.org, linux-acpi@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH] acpi: get rid of acpi_sleep_dispatch
On Monday, February 4, 2019 4:32:10 PM CET Christoph Hellwig wrote:
> No need for the array of structs of function pointers when we can just
> call the handfull of functions directly.
>
> This could be further cleaned up if acpi_gbl_reduced_hardware was defined
> true in the ACPI_REDUCED_HARDWARE case, but that's material for the next
> round.
>
> Signed-off-by: Christoph Hellwig <hch@....de>
> ---
> drivers/acpi/acpica/hwxfsleep.c | 96 +++++++--------------------------
> include/acpi/actypes.h | 9 ----
> 2 files changed, 18 insertions(+), 87 deletions(-)
>
> diff --git a/drivers/acpi/acpica/hwxfsleep.c b/drivers/acpi/acpica/hwxfsleep.c
> index 3f22f7dd4556..f58b78eaec65 100644
> --- a/drivers/acpi/acpica/hwxfsleep.c
> +++ b/drivers/acpi/acpica/hwxfsleep.c
> @@ -23,33 +23,6 @@ acpi_hw_set_firmware_waking_vector(struct acpi_table_facs *facs,
> acpi_physical_address physical_address64);
> #endif
>
> -static acpi_status acpi_hw_sleep_dispatch(u8 sleep_state, u32 function_id);
> -
> -/*
> - * Dispatch table used to efficiently branch to the various sleep
> - * functions.
> - */
> -#define ACPI_SLEEP_FUNCTION_ID 0
> -#define ACPI_WAKE_PREP_FUNCTION_ID 1
> -#define ACPI_WAKE_FUNCTION_ID 2
> -
> -/* Legacy functions are optional, based upon ACPI_REDUCED_HARDWARE */
> -
> -static struct acpi_sleep_functions acpi_sleep_dispatch[] = {
> - {ACPI_STRUCT_INIT(legacy_function,
> - ACPI_HW_OPTIONAL_FUNCTION(acpi_hw_legacy_sleep)),
> - ACPI_STRUCT_INIT(extended_function,
> - acpi_hw_extended_sleep)},
> - {ACPI_STRUCT_INIT(legacy_function,
> - ACPI_HW_OPTIONAL_FUNCTION(acpi_hw_legacy_wake_prep)),
> - ACPI_STRUCT_INIT(extended_function,
> - acpi_hw_extended_wake_prep)},
> - {ACPI_STRUCT_INIT(legacy_function,
> - ACPI_HW_OPTIONAL_FUNCTION(acpi_hw_legacy_wake)),
> - ACPI_STRUCT_INIT(extended_function,
> - acpi_hw_extended_wake)}
> -};
> -
> /*
> * These functions are removed for the ACPI_REDUCED_HARDWARE case:
> * acpi_set_firmware_waking_vector
> @@ -209,53 +182,6 @@ acpi_status acpi_enter_sleep_state_s4bios(void)
>
> ACPI_EXPORT_SYMBOL(acpi_enter_sleep_state_s4bios)
> #endif /* !ACPI_REDUCED_HARDWARE */
> -/*******************************************************************************
> - *
> - * FUNCTION: acpi_hw_sleep_dispatch
> - *
> - * PARAMETERS: sleep_state - Which sleep state to enter/exit
> - * function_id - Sleep, wake_prep, or Wake
> - *
> - * RETURN: Status from the invoked sleep handling function.
> - *
> - * DESCRIPTION: Dispatch a sleep/wake request to the appropriate handling
> - * function.
> - *
> - ******************************************************************************/
> -static acpi_status acpi_hw_sleep_dispatch(u8 sleep_state, u32 function_id)
> -{
> - acpi_status status;
> - struct acpi_sleep_functions *sleep_functions =
> - &acpi_sleep_dispatch[function_id];
> -
> -#if (!ACPI_REDUCED_HARDWARE)
> - /*
> - * If the Hardware Reduced flag is set (from the FADT), we must
> - * use the extended sleep registers (FADT). Note: As per the ACPI
> - * specification, these extended registers are to be used for HW-reduced
> - * platforms only. They are not general-purpose replacements for the
> - * legacy PM register sleep support.
> - */
> - if (acpi_gbl_reduced_hardware) {
> - status = sleep_functions->extended_function(sleep_state);
> - } else {
> - /* Legacy sleep */
> -
> - status = sleep_functions->legacy_function(sleep_state);
> - }
> -
> - return (status);
> -
> -#else
> - /*
> - * For the case where reduced-hardware-only code is being generated,
> - * we know that only the extended sleep registers are available
> - */
> - status = sleep_functions->extended_function(sleep_state);
> - return (status);
> -
> -#endif /* !ACPI_REDUCED_HARDWARE */
> -}
>
> /*******************************************************************************
> *
> @@ -362,7 +288,12 @@ acpi_status acpi_enter_sleep_state(u8 sleep_state)
> return_ACPI_STATUS(AE_AML_OPERAND_VALUE);
> }
>
> - status = acpi_hw_sleep_dispatch(sleep_state, ACPI_SLEEP_FUNCTION_ID);
> +#if !ACPI_REDUCED_HARDWARE
> + if (!acpi_gbl_reduced_hardware)
> + status = acpi_hw_legacy_sleep(sleep_state);
> + else
> +#endif
> + status = acpi_hw_extended_sleep(sleep_state);
> return_ACPI_STATUS(status);
> }
>
> @@ -388,8 +319,12 @@ acpi_status acpi_leave_sleep_state_prep(u8 sleep_state)
>
> ACPI_FUNCTION_TRACE(acpi_leave_sleep_state_prep);
>
> - status =
> - acpi_hw_sleep_dispatch(sleep_state, ACPI_WAKE_PREP_FUNCTION_ID);
> +#if !ACPI_REDUCED_HARDWARE
> + if (!acpi_gbl_reduced_hardware)
> + status = acpi_hw_legacy_wake_prep(sleep_state);
> + else
> +#endif
> + status = acpi_hw_extended_wake_prep(sleep_state);
> return_ACPI_STATUS(status);
> }
>
> @@ -413,7 +348,12 @@ acpi_status acpi_leave_sleep_state(u8 sleep_state)
>
> ACPI_FUNCTION_TRACE(acpi_leave_sleep_state);
>
> - status = acpi_hw_sleep_dispatch(sleep_state, ACPI_WAKE_FUNCTION_ID);
> +#if !ACPI_REDUCED_HARDWARE
> + if (!acpi_gbl_reduced_hardware)
> + status = acpi_hw_legacy_wake(sleep_state);
> + else
> +#endif
> + status = acpi_hw_extended_wake(sleep_state);
> return_ACPI_STATUS(status);
> }
>
> diff --git a/include/acpi/actypes.h b/include/acpi/actypes.h
> index 2590627dbfcc..9b11d07e4363 100644
> --- a/include/acpi/actypes.h
> +++ b/include/acpi/actypes.h
> @@ -885,15 +885,6 @@ typedef u8 acpi_adr_space_type;
> #define ACPI_ENABLE_EVENT 1
> #define ACPI_DISABLE_EVENT 0
>
> -/* Sleep function dispatch */
> -
> -typedef acpi_status (*acpi_sleep_function) (u8 sleep_state);
> -
> -struct acpi_sleep_functions {
> - acpi_sleep_function legacy_function;
> - acpi_sleep_function extended_function;
> -};
> -
> /*
> * External ACPI object definition
> */
>
Applied, thanks!
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