From mboxrd@z Thu Jan 1 00:00:00 1970 From: brian.starkey@arm.com (Brian Starkey) Date: Mon, 29 Feb 2016 16:09:20 +0000 Subject: [PATCH v2 0/4] Fix kernel panic in dma-coherent allocations Message-ID: To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org Hi, These patches implement a MEMREMAP_WC flag for memremap(), which can be used to obtain writecombine mappings. This is then used for setting up dma_coherent_mem regions which use the DMA_MEMORY_MAP flag. The motivation is to fix an alignment fault on arm64, and the suggestion to implement MEMREMAP_WC for this case was made at [1]. That particular issue is handled in patch 4, which makes sure that the appropriate memset function is used when zeroing allocations mapped as IO memory. Best Regards, Brian [1] http://lists.infradead.org/pipermail/linux-arm-kernel/2015-December/390857.html Changes since v1: * Added preparatory patch removing flag modifications in memremap() (Suggested by Andrew Morton) * Rebase onto linux-next Brian Starkey (4): memremap: don't modify flags memremap: add MEMREMAP_WC flag. drivers: dma-coherent: use MEMREMAP_WC for DMA_MEMORY_MAP drivers: dma-coherent: use memset_io for DMA_MEMORY_IO mappings drivers/base/dma-coherent.c | 25 ++++++++++++++++++++----- include/linux/io.h | 1 + kernel/memremap.c | 24 +++++++++++++++--------- 3 files changed, 36 insertions(+), 14 deletions(-) -- 1.7.9.5 From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755891AbcB2QJg (ORCPT ); Mon, 29 Feb 2016 11:09:36 -0500 Received: from foss.arm.com ([217.140.101.70]:45650 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752059AbcB2QJf (ORCPT ); Mon, 29 Feb 2016 11:09:35 -0500 From: Brian Starkey To: Andrew Morton Cc: Catalin Marinas , Dan Williams , Greg Kroah-Hartman , linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org Subject: [PATCH v2 0/4] Fix kernel panic in dma-coherent allocations Date: Mon, 29 Feb 2016 16:09:20 +0000 Message-Id: X-Mailer: git-send-email 1.7.9.5 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi, These patches implement a MEMREMAP_WC flag for memremap(), which can be used to obtain writecombine mappings. This is then used for setting up dma_coherent_mem regions which use the DMA_MEMORY_MAP flag. The motivation is to fix an alignment fault on arm64, and the suggestion to implement MEMREMAP_WC for this case was made at [1]. That particular issue is handled in patch 4, which makes sure that the appropriate memset function is used when zeroing allocations mapped as IO memory. Best Regards, Brian [1] http://lists.infradead.org/pipermail/linux-arm-kernel/2015-December/390857.html Changes since v1: * Added preparatory patch removing flag modifications in memremap() (Suggested by Andrew Morton) * Rebase onto linux-next Brian Starkey (4): memremap: don't modify flags memremap: add MEMREMAP_WC flag. drivers: dma-coherent: use MEMREMAP_WC for DMA_MEMORY_MAP drivers: dma-coherent: use memset_io for DMA_MEMORY_IO mappings drivers/base/dma-coherent.c | 25 ++++++++++++++++++++----- include/linux/io.h | 1 + kernel/memremap.c | 24 +++++++++++++++--------- 3 files changed, 36 insertions(+), 14 deletions(-) -- 1.7.9.5