On Mon, Jul 31, 2017 at 8:23 AM, 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 > > drivers/acpi/acpica/rsxface.c | 7 ++-- > drivers/acpi/arm64/iort.c | 50 +++++++++++++++++++++++- > drivers/acpi/resource.c | 82 ++++++++++++++++++++++++++++++--------- > drivers/acpi/scan.c | 90 +++++++++++++++++++++++++++++++++++++++---- > 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, 211 insertions(+), 34 deletions(-) > > -- > 2.10.0 > Thanks, this was tested and works on the XGene system. Tested-by: Feng Kan <fkan@xxxxxxx> -- To unsubscribe from this list: send the line "unsubscribe linux-acpi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
