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SubjectRe: [PATCH v3 0/5] ACPI: DMA ranges management
On Thu, Aug 3, 2017 at 5:32 AM, Lorenzo Pieralisi
<lorenzo.pieralisi@arm.com> wrote:
> This patch series is v3 of a previous posting:
>
> v2->v3:
> - Fixed DMA masks computation
> - Fixed size computation overflow in acpi_dma_get_range()
>
> v1->v2:
> - Reworked acpi_dma_get_range() flow and logs
> - Added IORT named component address limits
> - Renamed acpi_dev_get_resources() helper function
> - Rebased against v4.13-rc3
>
> v2: http://lkml.kernel.org/r/20170731152323.32488-1-lorenzo.pieralisi@arm.com
> v1: http://lkml.kernel.org/r/20170720144517.32529-1-lorenzo.pieralisi@arm.com
>
> -- Original cover letter --
>
> As reported in:
>
> http://lkml.kernel.org/r/CAL85gmA_SSCwM80TKdkZqEe+S1beWzDEvdki1kpkmUTDRmSP7g@mail.gmail.com
>
> the bus connecting devices to an IOMMU bus can be smaller in size than
> the IOMMU input address bits which results in devices DMA HW bugs in
> particular related to IOVA allocation (ie chopping of higher address
> bits owing to system bus HW capabilities mismatch with the IOMMU).
>
> Fortunately this problem can be solved through an already present but never
> used ACPI 6.2 firmware bindings (ie _DMA object) allowing to define the DMA
> window for a specific bus in ACPI and therefore all upstream devices
> connected to it.
>
> This small patch series enables _DMA parsing in ACPI core code and
> use it in ACPI IORT code in order to detect DMA ranges for devices and
> update their data structures to make them work with their related DMA
> addressing restrictions.
>
> Cc: Will Deacon <will.deacon@arm.com>
> Cc: Hanjun Guo <hanjun.guo@linaro.org>
> Cc: Feng Kan <fkan@apm.com>
> Cc: Jon Masters <jcm@redhat.com>
> Cc: Robert Moore <robert.moore@intel.com>
> Cc: Robin Murphy <robin.murphy@arm.com>
> Cc: Zhang Rui <rui.zhang@intel.com>
> Cc: "Rafael J. Wysocki" <rjw@rjwysocki.net>
>
> Lorenzo Pieralisi (5):
> ACPICA: resource_mgr: Allow _DMA method in walk resources
> ACPI: Make acpi_dev_get_resources() method agnostic
> ACPI: Introduce DMA ranges parsing
> ACPI: Make acpi_dma_configure() DMA regions aware
> ACPI/IORT: Add IORT named component memory address limits
>
> drivers/acpi/acpica/rsxface.c | 7 ++--
> drivers/acpi/arm64/iort.c | 57 ++++++++++++++++++++++++++-
> drivers/acpi/resource.c | 82 +++++++++++++++++++++++++++++---------
> drivers/acpi/scan.c | 91 +++++++++++++++++++++++++++++++++++++++----
> include/acpi/acnames.h | 1 +
> include/acpi/acpi_bus.h | 2 +
> include/linux/acpi.h | 8 ++++
> include/linux/acpi_iort.h | 5 ++-
> 8 files changed, 219 insertions(+), 34 deletions(-)
>
> --
> 2.10.0
>
Works on XGene.
Tested-by: Feng Kan <fkan@apm.com>

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