On 2017/8/3 20:32, Lorenzo Pieralisi 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@xxxxxxx > v1: http://lkml.kernel.org/r/20170720144517.32529-1-lorenzo.pieralisi@xxxxxxx > > -- 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> with the whole patch set: Reviewed-by: Hanjun Guo <hanjun.guo@xxxxxxxxxx> I tested this patch set with no _DMA in DSDT but with named component in IORT table, seeing no regressions on D05. Thanks Hanjun -- 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
