Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754860AbdGTOnh (ORCPT ); Thu, 20 Jul 2017 10:43:37 -0400 Received: from foss.arm.com ([217.140.101.70]:55016 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932138AbdGTOnd (ORCPT ); Thu, 20 Jul 2017 10:43:33 -0400 From: Lorenzo Pieralisi To: linux-acpi@vger.kernel.org Cc: linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, Lorenzo Pieralisi , Will Deacon , Hanjun Guo , Feng Kan , Jon Masters , Robert Moore , Robin Murphy , Zhang Rui , "Rafael J. Wysocki" , Nate Watterson Subject: [PATCH 0/4] ACPI: DMA ranges management Date: Thu, 20 Jul 2017 15:45:12 +0100 Message-Id: <20170720144517.32529-1-lorenzo.pieralisi@arm.com> X-Mailer: git-send-email 2.10.0 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1838 Lines: 46 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 Cc: Hanjun Guo Cc: Feng Kan Cc: Jon Masters Cc: Robert Moore Cc: Robin Murphy Cc: Zhang Rui Cc: "Rafael J. Wysocki" Lorenzo Pieralisi (4): ACPI: 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 drivers/acpi/acpica/rsxface.c | 7 ++-- drivers/acpi/arm64/iort.c | 27 +++++++++++- drivers/acpi/resource.c | 83 ++++++++++++++++++++++++++++--------- drivers/acpi/scan.c | 95 +++++++++++++++++++++++++++++++++++++++---- 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, 194 insertions(+), 34 deletions(-) -- 2.10.0