Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752021AbdGGHKR (ORCPT ); Fri, 7 Jul 2017 03:10:17 -0400 Received: from mail-qk0-f175.google.com ([209.85.220.175]:34841 "EHLO mail-qk0-f175.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750950AbdGGHKP (ORCPT ); Fri, 7 Jul 2017 03:10:15 -0400 From: Srinath Mannam To: Rob Herring , Joerg Roedel , Bjorn Helgaas , Mark Rutland , Frank Rowand Cc: iommu@lists.linux-foundation.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, bcm-kernel-feedback-list@broadcom.com, Srinath Mannam Subject: [RFC PATCH 0/2] Add sideband data extraction Date: Fri, 7 Jul 2017 12:39:57 +0530 Message-Id: <1499411399-25103-1-git-send-email-srinath.mannam@broadcom.com> X-Mailer: git-send-email 2.7.4 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1245 Lines: 30 These patches implements optional DT properties to generate smaller sideband data from RID which can be further mapped to MSI Device ID or Stream ID On some of the systems, sideband data is smaller than RID (16bits). For such system, sideband data has to be generated by dropping some of the RID bits the process of sideband data extracted from RID can be expressed using optional DT property {iommu/msi}-map-drop-mask. Example: If drop-mask is 0xFF09 then sideband data is 8 bits bus number followed by 1 bit of device number and 1 bit function number. This means drop-mask=0xFF09 will convert RID=0x1a10 (16bits) to sideband data 0x6a (10bits). Srinath Mannam (2): dt-bindings: pci: Add drop mask property for MSI and IOMMU pcie: sideband data by dropping RID bits .../devicetree/bindings/pci/pci-iommu.txt | 31 ++++++++++++++ Documentation/devicetree/bindings/pci/pci-msi.txt | 33 +++++++++++++++ drivers/iommu/of_iommu.c | 4 +- drivers/of/irq.c | 3 +- drivers/of/of_pci.c | 48 ++++++++++++++++++++-- include/linux/of_pci.h | 6 ++- 6 files changed, 117 insertions(+), 8 deletions(-) -- 2.7.4