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Fri, 25 Aug 2023 10:12:06 +0000 (GMT) From: Niklas Schnelle Date: Fri, 25 Aug 2023 12:11:17 +0200 Subject: [PATCH v12 2/6] s390/pci: prepare is_passed_through() for dma-iommu MIME-Version: 1.0 Message-Id: <20230825-dma_iommu-v12-2-4134455994a7@linux.ibm.com> References: <20230825-dma_iommu-v12-0-4134455994a7@linux.ibm.com> In-Reply-To: <20230825-dma_iommu-v12-0-4134455994a7@linux.ibm.com> To: Joerg Roedel , Matthew Rosato , Will Deacon , Wenjia Zhang , Robin Murphy , Jason Gunthorpe Cc: Gerd Bayer , Julian Ruess , Pierre Morel , Alexandra Winter , Heiko Carstens , Vasily Gorbik , Alexander Gordeev , Christian Borntraeger , Sven Schnelle , Suravee Suthikulpanit , Hector Martin , Sven Peter , Alyssa Rosenzweig , David Woodhouse , Lu Baolu , Andy Gross , Bjorn Andersson , Konrad Dybcio , Yong Wu , Matthias Brugger , AngeloGioacchino Del Regno , Gerald Schaefer , Orson Zhai , Baolin Wang , Chunyan Zhang , Chen-Yu Tsai , Jernej Skrabec , Samuel Holland , Thierry Reding , Krishna Reddy , Jonathan Hunter , Niklas Schnelle , Jonathan Corbet , linux-s390@vger.kernel.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, iommu@lists.linux.dev, asahi@lists.linux.dev, linux-arm-kernel@lists.infradead.org, linux-arm-msm@vger.kernel.org, linux-mediatek@lists.infradead.org, linux-sunxi@lists.linux.dev, linux-tegra@vger.kernel.org, linux-doc@vger.kernel.org X-Mailer: b4 0.12.3 X-Developer-Signature: v=1; a=openpgp-sha256; l=1902; i=schnelle@linux.ibm.com; h=from:subject:message-id; bh=JnpBPtIA02SvkModRZiVKujLXSYwAXU0tTNoKrRKqJY=; b=owGbwMvMwCH2Wz534YHOJ2GMp9WSGFJe1IUcc9h7XHu51WPvO+zv3cOYzPd2B7b++/Ax3NmOR efghglzOkpZGMQ4GGTFFFkWdTn7rSuYYronqL8DZg4rE8gQBi5OAZhIhwUjw/GnR3aIdUxw02Ov 8tpoI8iY7K9StnbFlHsMmi/LbC41f2dkeOZf9X++fE7duYbvzFfuVlnUFuzMW+LQe39mw4O5YrX 5PAA= X-Developer-Key: i=schnelle@linux.ibm.com; a=openpgp; fpr=9DB000B2D2752030A5F72DDCAFE43F15E8C26090 X-TM-AS-GCONF: 00 X-Proofpoint-GUID: utpUsFVahlz9Ze1DedlzglGm8EfATxwy X-Proofpoint-ORIG-GUID: dvRLjZZnSsxMCbDCwCnGe28_Mn6pPYfD X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.267,Aquarius:18.0.957,Hydra:6.0.601,FMLib:17.11.176.26 definitions=2023-08-25_08,2023-08-24_01,2023-05-22_02 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 bulkscore=0 impostorscore=0 lowpriorityscore=0 mlxscore=0 mlxlogscore=953 spamscore=0 phishscore=0 priorityscore=1501 suspectscore=0 adultscore=0 malwarescore=0 clxscore=1015 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2308100000 definitions=main-2308250087 Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org With the IOMMU always controlled through the IOMMU driver testing for zdev->s390_domain is not a valid indication of the device being passed-through. Instead test if zdev->kzdev is set. Reviewed-by: Pierre Morel Reviewed-by: Matthew Rosato Signed-off-by: Niklas Schnelle --- arch/s390/pci/pci_event.c | 15 +++++++++++---- 1 file changed, 11 insertions(+), 4 deletions(-) diff --git a/arch/s390/pci/pci_event.c b/arch/s390/pci/pci_event.c index b9324ca2eb94..4ef5a6a1d618 100644 --- a/arch/s390/pci/pci_event.c +++ b/arch/s390/pci/pci_event.c @@ -59,9 +59,16 @@ static inline bool ers_result_indicates_abort(pci_ers_result_t ers_res) } } -static bool is_passed_through(struct zpci_dev *zdev) +static bool is_passed_through(struct pci_dev *pdev) { - return zdev->s390_domain; + struct zpci_dev *zdev = to_zpci(pdev); + bool ret; + + mutex_lock(&zdev->kzdev_lock); + ret = !!zdev->kzdev; + mutex_unlock(&zdev->kzdev_lock); + + return ret; } static bool is_driver_supported(struct pci_driver *driver) @@ -176,7 +183,7 @@ static pci_ers_result_t zpci_event_attempt_error_recovery(struct pci_dev *pdev) } pdev->error_state = pci_channel_io_frozen; - if (is_passed_through(to_zpci(pdev))) { + if (is_passed_through(pdev)) { pr_info("%s: Cannot be recovered in the host because it is a pass-through device\n", pci_name(pdev)); goto out_unlock; @@ -239,7 +246,7 @@ static void zpci_event_io_failure(struct pci_dev *pdev, pci_channel_state_t es) * we will inject the error event and let the guest recover the device * itself. */ - if (is_passed_through(to_zpci(pdev))) + if (is_passed_through(pdev)) goto out; driver = to_pci_driver(pdev->dev.driver); if (driver && driver->err_handler && driver->err_handler->error_detected)