Re: [PATCH v2 0/5] ACPI: DMA ranges management
From: Lorenzo Pieralisi
Date: Wed Aug 02 2017 - 12:50:30 EST
On Mon, Jul 31, 2017 at 08:57:19PM +0200, Rafael J. Wysocki wrote:
> On Mon, Jul 31, 2017 at 5:23 PM, Lorenzo Pieralisi
> <lorenzo.pieralisi@xxxxxxx> wrote:
> > This patch series is v2 of a previous posting:
> > v1: http://lkml.kernel.org/r/20170720144517.32529-1-lorenzo.pieralisi@xxxxxxx
> > 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
> > -- Original cover letter --
> > As reported in:
> > http://lkml.kernel.org/r/CAL85gmA_SSCwM80TKdkZqEe+S1beWzDEvdki1kpkmUTDRmSP7g@xxxxxxxxxxxxxx
> > 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@xxxxxxx>
> > Cc: Hanjun Guo <hanjun.guo@xxxxxxxxxx>
> > Cc: Feng Kan <fkan@xxxxxxx>
> > Cc: Jon Masters <jcm@xxxxxxxxxx>
> > Cc: Robert Moore <robert.moore@xxxxxxxxx>
> > Cc: Robin Murphy <robin.murphy@xxxxxxx>
> > Cc: Zhang Rui <rui.zhang@xxxxxxxxx>
> > Cc: "Rafael J. Wysocki" <rjw@xxxxxxxxxxxxx>
> > 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
> Patches [1-3/5] are fine by me, but I need ACKs from the ARM side on
> the last two ones.
Will, Robin, are you ok with this series ?
@Nate: I'd need your tested-by on v2 please (ie IORT named component
address limits handling) before we go ahead.