Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S965643AbbKEEqu (ORCPT ); Wed, 4 Nov 2015 23:46:50 -0500 Received: from smtp.codeaurora.org ([198.145.29.96]:58218 "EHLO smtp.codeaurora.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S964903AbbKEEqt (ORCPT ); Wed, 4 Nov 2015 23:46:49 -0500 From: Sinan Kaya To: linux-scsi@vger.kernel.org, timur@codeaurora.org, cov@codeaurora.org, jcm@redhat.com Cc: Sinan Kaya , Nagalakshmi Nandigama , Praveen Krishnamoorthy , Sreekanth Reddy , Abhijit Mahajan , "James E.J. Bottomley" , MPT-FusionLinux.pdl@avagotech.com, linux-kernel@vger.kernel.org Subject: [PATCH 1/4] scsi: mpt2sas: try 64 bit DMA when 32 bit DMA fails Date: Wed, 4 Nov 2015 23:46:26 -0500 Message-Id: <1446698789-19308-1-git-send-email-okaya@codeaurora.org> X-Mailer: git-send-email 1.8.2.1 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1742 Lines: 51 Current code gives up when 32 bit DMA is not supported. This patch tests 64 bit support before bailing out in such conditions. Signed-off-by: Sinan Kaya --- drivers/scsi/mpt2sas/mpt2sas_base.c | 21 ++++++++++++++++++++- 1 file changed, 20 insertions(+), 1 deletion(-) diff --git a/drivers/scsi/mpt2sas/mpt2sas_base.c b/drivers/scsi/mpt2sas/mpt2sas_base.c index c167911..c61c82a 100644 --- a/drivers/scsi/mpt2sas/mpt2sas_base.c +++ b/drivers/scsi/mpt2sas/mpt2sas_base.c @@ -1217,8 +1217,27 @@ _base_config_dma_addressing(struct MPT2SAS_ADAPTER *ioc, struct pci_dev *pdev) ioc->base_add_sg_single = &_base_add_sg_single_32; ioc->sge_size = sizeof(Mpi2SGESimple32_t); ioc->dma_mask = 32; - } else + } else { + /* Try 64 bit, 32 bit failed */ + consistent_dma_mask = DMA_BIT_MASK(64); + + if (sizeof(dma_addr_t) > 4) { + const uint64_t required_mask = + dma_get_required_mask(&pdev->dev); + if ((required_mask > DMA_BIT_MASK(32)) && + !pci_set_dma_mask(pdev, DMA_BIT_MASK(64)) && + !pci_set_consistent_dma_mask(pdev, + consistent_dma_mask)) { + ioc->base_add_sg_single = + &_base_add_sg_single_64; + ioc->sge_size = sizeof(Mpi2SGESimple64_t); + ioc->dma_mask = 64; + goto out; + } + } + return -ENODEV; + } out: si_meminfo(&s); -- Qualcomm Technologies, Inc. on behalf of Qualcomm Innovation Center, Inc. Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, a Linux Foundation Collaborative Project -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/