From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mx0a-001b2d01.pphosted.com ([148.163.156.1]:43404 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727003AbfFFU2l (ORCPT ); Thu, 6 Jun 2019 16:28:41 -0400 Received: from pps.filterd (m0098410.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.16.0.27/8.16.0.27) with SMTP id x56KR5ba122078 for ; Thu, 6 Jun 2019 16:28:40 -0400 Received: from e06smtp02.uk.ibm.com (e06smtp02.uk.ibm.com [195.75.94.98]) by mx0a-001b2d01.pphosted.com with ESMTP id 2sy7hcppm2-1 (version=TLSv1.2 cipher=AES256-GCM-SHA384 bits=256 verify=NOT) for ; Thu, 06 Jun 2019 16:28:39 -0400 Received: from localhost by e06smtp02.uk.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted for from ; Thu, 6 Jun 2019 21:28:37 +0100 From: Eric Farman Subject: [PATCH v2 8/9] vfio-ccw: Rearrange IDAL allocation in direct CCW Date: Thu, 6 Jun 2019 22:28:30 +0200 In-Reply-To: <20190606202831.44135-1-farman@linux.ibm.com> References: <20190606202831.44135-1-farman@linux.ibm.com> Message-Id: <20190606202831.44135-9-farman@linux.ibm.com> Sender: linux-s390-owner@vger.kernel.org List-ID: To: Cornelia Huck , Farhan Ali Cc: Halil Pasic , linux-s390@vger.kernel.org, kvm@vger.kernel.org, Eric Farman This is purely deck furniture, to help understand the merge of the direct and indirect handlers. Signed-off-by: Eric Farman --- drivers/s390/cio/vfio_ccw_cp.c | 25 +++++++++++++++---------- 1 file changed, 15 insertions(+), 10 deletions(-) diff --git a/drivers/s390/cio/vfio_ccw_cp.c b/drivers/s390/cio/vfio_ccw_cp.c index 76ffcc823944..8205d0b527fc 100644 --- a/drivers/s390/cio/vfio_ccw_cp.c +++ b/drivers/s390/cio/vfio_ccw_cp.c @@ -537,13 +537,21 @@ static int ccwchain_fetch_direct(struct ccwchain *chain, unsigned long *idaws; int ret; int bytes = 1; - int idaw_nr = 1; + int idaw_nr; ccw = chain->ch_ccw + idx; - if (ccw->count) { + if (ccw->count) bytes = ccw->count; - idaw_nr = idal_nr_words((void *)(u64)ccw->cda, ccw->count); + + /* Calculate size of IDAL */ + idaw_nr = idal_nr_words((void *)(u64)ccw->cda, bytes); + + /* Allocate an IDAL from host storage */ + idaws = kcalloc(idaw_nr, sizeof(*idaws), GFP_DMA | GFP_KERNEL); + if (!idaws) { + ret = -ENOMEM; + goto out_init; } /* @@ -554,7 +562,7 @@ static int ccwchain_fetch_direct(struct ccwchain *chain, pa = chain->ch_pa + idx; ret = pfn_array_alloc(pa, ccw->cda, bytes); if (ret < 0) - goto out_unpin; + goto out_free_idaws; if (ccw_does_data_transfer(ccw)) { ret = pfn_array_pin(pa, cp->mdev); @@ -564,21 +572,18 @@ static int ccwchain_fetch_direct(struct ccwchain *chain, pa->pa_nr = 0; } - /* Translate this direct ccw to a idal ccw. */ - idaws = kcalloc(idaw_nr, sizeof(*idaws), GFP_DMA | GFP_KERNEL); - if (!idaws) { - ret = -ENOMEM; - goto out_unpin; - } ccw->cda = (__u32) virt_to_phys(idaws); ccw->flags |= CCW_FLAG_IDA; + /* Populate the IDAL with pinned/translated addresses from pfn */ pfn_array_idal_create_words(pa, idaws); return 0; out_unpin: pfn_array_unpin_free(pa, cp->mdev); +out_free_idaws: + kfree(idaws); out_init: ccw->cda = 0; return ret; -- 2.17.1