[PATCH 1/4] ACPI: Allow _DMA method in walk resources

[Moore, Robert]

I think we can take this as-is into ACPICA.
Bob


> -----Original Message-----
> From: Lorenzo Pieralisi [mailto:lorenzo.pieralisi at arm.com]
> Sent: Thursday, July 20, 2017 7:45 AM
> To: linux-acpi at vger.kernel.org
> Cc: linux-arm-kernel at lists.infradead.org; linux-kernel at vger.kernel.org;
> Lorenzo Pieralisi <lorenzo.pieralisi at arm.com>; Moore, Robert
> <robert.moore at intel.com>; Zhang, Rui <rui.zhang at intel.com>; Rafael J.
> Wysocki <rjw at rjwysocki.net>; Will Deacon <will.deacon at arm.com>; Robin
> Murphy <robin.murphy at arm.com>; Hanjun Guo <hanjun.guo at linaro.org>; Feng
> Kan <fkan at apm.com>; Jon Masters <jcm at redhat.com>; Nate Watterson
> <nwatters at codeaurora.org>
> Subject: [PATCH 1/4] ACPI: Allow _DMA method in walk resources
> 
> The _DMA object contains a resource template, this change adds support
> for the walk resources function so that ACPI devices containing a _DMA
> object can actually parse it to detect DMA ranges for the respective
> bus.
> 
> Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi at arm.com>
> Cc: Robert Moore <robert.moore at intel.com>
> Cc: Zhang Rui <rui.zhang at intel.com>
> Cc: "Rafael J. Wysocki" <rjw at rjwysocki.net>
> ---
>  drivers/acpi/acpica/rsxface.c | 7 ++++---
>  include/acpi/acnames.h        | 1 +
>  2 files changed, 5 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/acpi/acpica/rsxface.c
> b/drivers/acpi/acpica/rsxface.c index 59a4f9e..be65e65 100644
> --- a/drivers/acpi/acpica/rsxface.c
> +++ b/drivers/acpi/acpica/rsxface.c
> @@ -615,7 +615,7 @@ ACPI_EXPORT_SYMBOL(acpi_walk_resource_buffer)
>   *                                device we are querying
>   *              name            - Method name of the resources we want.
>   *                                (METHOD_NAME__CRS, METHOD_NAME__PRS,
> or
> - *                                METHOD_NAME__AEI)
> + *                                METHOD_NAME__AEI or METHOD_NAME__DMA)
>   *              user_function   - Called for each resource
>   *              context         - Passed to user_function
>   *
> @@ -641,11 +641,12 @@ acpi_walk_resources(acpi_handle device_handle,
>  	if (!device_handle || !user_function || !name ||
>  	    (!ACPI_COMPARE_NAME(name, METHOD_NAME__CRS) &&
>  	     !ACPI_COMPARE_NAME(name, METHOD_NAME__PRS) &&
> -	     !ACPI_COMPARE_NAME(name, METHOD_NAME__AEI))) {
> +	     !ACPI_COMPARE_NAME(name, METHOD_NAME__AEI) &&
> +	     !ACPI_COMPARE_NAME(name, METHOD_NAME__DMA))) {
>  		return_ACPI_STATUS(AE_BAD_PARAMETER);
>  	}
> 
> -	/* Get the _CRS/_PRS/_AEI resource list */
> +	/* Get the _CRS/_PRS/_AEI/_DMA resource list */
> 
>  	buffer.length = ACPI_ALLOCATE_LOCAL_BUFFER;
>  	status = acpi_rs_get_method_data(device_handle, name, &buffer);
> diff --git a/include/acpi/acnames.h b/include/acpi/acnames.h index
> b421584..d8dd3bf 100644
> --- a/include/acpi/acnames.h
> +++ b/include/acpi/acnames.h
> @@ -54,6 +54,7 @@
>  #define METHOD_NAME__CLS        "_CLS"
>  #define METHOD_NAME__CRS        "_CRS"
>  #define METHOD_NAME__DDN        "_DDN"
> +#define METHOD_NAME__DMA        "_DMA"
>  #define METHOD_NAME__HID        "_HID"
>  #define METHOD_NAME__INI        "_INI"
>  #define METHOD_NAME__PLD        "_PLD"
> --
> 2.10.0