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    SubjectRE: [PATCH 1/4] ACPI: Allow _DMA method in walk resources
    Date
    I think we can take this as-is into ACPICA.
    Bob


    > -----Original Message-----
    > From: Lorenzo Pieralisi [mailto:lorenzo.pieralisi@arm.com]
    > Sent: Thursday, July 20, 2017 7:45 AM
    > To: linux-acpi@vger.kernel.org
    > Cc: linux-arm-kernel@lists.infradead.org; linux-kernel@vger.kernel.org;
    > Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>; Moore, Robert
    > <robert.moore@intel.com>; Zhang, Rui <rui.zhang@intel.com>; Rafael J.
    > Wysocki <rjw@rjwysocki.net>; Will Deacon <will.deacon@arm.com>; Robin
    > Murphy <robin.murphy@arm.com>; Hanjun Guo <hanjun.guo@linaro.org>; Feng
    > Kan <fkan@apm.com>; Jon Masters <jcm@redhat.com>; Nate Watterson
    > <nwatters@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@arm.com>
    > Cc: Robert Moore <robert.moore@intel.com>
    > Cc: Zhang Rui <rui.zhang@intel.com>
    > Cc: "Rafael J. Wysocki" <rjw@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

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