From patchwork Thu Mar 7 06:36:07 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Longfang Liu X-Patchwork-Id: 13585129 Received: from szxga01-in.huawei.com (szxga01-in.huawei.com [45.249.212.187]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id A8526D304; Thu, 7 Mar 2024 06:40:40 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=45.249.212.187 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1709793644; cv=none; b=E6QBE36w6OY3UDRdp0s7cIQjzdmeL+kFCSlWjSuWWpfoqQagSuKOByXXVWKzoWSNQlE1KL2UUbOxuDy8qufbFJfjRWdp5Nm+dnaGq7JhHNmaogiGoRiVFDx4XYNg5NZnkx1gw/gJ95tUCh7a1EO4ZRfFOi8M3DSV1pjc0AmCuxw= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1709793644; c=relaxed/simple; bh=HNx9q8SnKI+B5Ngx3oTnnSFOAGUJzeeBgkM/wDpNCiU=; h=From:To:CC:Subject:Date:Message-ID:MIME-Version:Content-Type; b=UnA9EdfWbwPsx4uCGG/VbFWC3Jq49c2Se90Si8hckY0nRmJS2GE9hl49l35ve0KVcEXnenQDkRPwtUY/nuBn20snaRz4Xn2+Yde07cki6bN4810kKlwXQpXURn7O4+3wkxaB6ko7u69awS6Kv1UWT04kvuF70a4oIi1DtSqJrWQ= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=huawei.com; spf=pass smtp.mailfrom=huawei.com; arc=none smtp.client-ip=45.249.212.187 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=huawei.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=huawei.com Received: from mail.maildlp.com (unknown [172.19.163.48]) by szxga01-in.huawei.com (SkyGuard) with ESMTP id 4Tr04B5PgvzwPFR; Thu, 7 Mar 2024 14:38:18 +0800 (CST) Received: from kwepemm600005.china.huawei.com (unknown [7.193.23.191]) by mail.maildlp.com (Postfix) with ESMTPS id 2830A180068; Thu, 7 Mar 2024 14:40:37 +0800 (CST) Received: from huawei.com (10.50.165.33) by kwepemm600005.china.huawei.com (7.193.23.191) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.1.2507.35; Thu, 7 Mar 2024 14:40:36 +0800 From: Longfang Liu To: , , , CC: , , , Subject: [PATCH v3 3/4] hisi_acc_vfio_pci: register debugfs for hisilicon migration driver Date: Thu, 7 Mar 2024 14:36:07 +0800 Message-ID: <20240307063608.26729-1-liulongfang@huawei.com> X-Mailer: git-send-email 2.24.0 Precedence: bulk X-Mailing-List: kvm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-ClientProxiedBy: dggems705-chm.china.huawei.com (10.3.19.182) To kwepemm600005.china.huawei.com (7.193.23.191) On the debugfs framework of VFIO, if the CONFIG_VFIO_DEBUGFS macro is enabled, the debug function is registered for the live migration driver of the HiSilicon accelerator device. After registering the HiSilicon accelerator device on the debugfs framework of live migration of vfio, a directory file "hisi_acc" of debugfs is created, and then three debug function files are created in this directory: vfio | +--- | +---migration | +--state | +--hisi_acc | +--attr | +--data | +--save | +--cmd_state | +--- +---migration +--state +--hisi_acc +--attr +--data +--save +--cmd_state data file: used to get the migration data from the driver attr file: used to get device attributes parameters from the driver save file: used to read the data of the live migration device and save it to the driver. cmd_state: used to get the cmd channel state for the device. +----------------+ +--------------+ +---------------+ | migration dev | | src dev | | dst dev | +-------+--------+ +------+-------+ +-------+-------+ | | | | | | | | | | | | save | +------v-------+ +-------v-------+ | | saving_mif | | resuming_migf | | | file | | file | | +------+-------+ +-------+-------+ | | | | mutex | | +-------v--------+ | | | | | | | debug_migf file<---------------+-----------------------+ | | copy +-------+--------+ | cat | | +-------v--------+ | user | +----------------+ In debugfs scheme. The driver creates a separate debug_migf file. It is completely separated from the two files of live migration, thus preventing debugfs data from interfering with migration data. Moreover, it only performs read operations on the device. For serialization of debugfs: First, it only writes data when performing a debugfs save operation. Second, it is only copied from the file on the migration device when the live migration is complete. These two operations are mutually exclusive through mutex. Signed-off-by: Longfang Liu --- .../vfio/pci/hisilicon/hisi_acc_vfio_pci.c | 204 ++++++++++++++++++ .../vfio/pci/hisilicon/hisi_acc_vfio_pci.h | 11 + 2 files changed, 215 insertions(+) diff --git a/drivers/vfio/pci/hisilicon/hisi_acc_vfio_pci.c b/drivers/vfio/pci/hisilicon/hisi_acc_vfio_pci.c index 1881f3fa9266..fe954b2a0701 100644 --- a/drivers/vfio/pci/hisilicon/hisi_acc_vfio_pci.c +++ b/drivers/vfio/pci/hisilicon/hisi_acc_vfio_pci.c @@ -15,6 +15,7 @@ #include #include "hisi_acc_vfio_pci.h" +#include "../../vfio.h" /* Return 0 on VM acc device ready, -ETIMEDOUT hardware timeout */ static int qm_wait_dev_not_ready(struct hisi_qm *qm) @@ -611,6 +612,22 @@ hisi_acc_check_int_state(struct hisi_acc_vf_core_device *hisi_acc_vdev) } } +static void hisi_acc_vf_migf_save(struct hisi_acc_vf_core_device *hisi_acc_vdev, + struct hisi_acc_vf_migration_file *src_migf) +{ + struct hisi_acc_vf_migration_file *dst_migf = hisi_acc_vdev->debug_migf; + + if (!dst_migf) + return; + + mutex_lock(&hisi_acc_vdev->enable_mutex); + dst_migf->disabled = src_migf->disabled; + dst_migf->total_length = src_migf->total_length; + memcpy(&dst_migf->vf_data, &src_migf->vf_data, + sizeof(struct acc_vf_data)); + mutex_unlock(&hisi_acc_vdev->enable_mutex); +} + static void hisi_acc_vf_disable_fd(struct hisi_acc_vf_migration_file *migf) { mutex_lock(&migf->lock); @@ -623,12 +640,14 @@ static void hisi_acc_vf_disable_fd(struct hisi_acc_vf_migration_file *migf) static void hisi_acc_vf_disable_fds(struct hisi_acc_vf_core_device *hisi_acc_vdev) { if (hisi_acc_vdev->resuming_migf) { + hisi_acc_vf_migf_save(hisi_acc_vdev, hisi_acc_vdev->resuming_migf); hisi_acc_vf_disable_fd(hisi_acc_vdev->resuming_migf); fput(hisi_acc_vdev->resuming_migf->filp); hisi_acc_vdev->resuming_migf = NULL; } if (hisi_acc_vdev->saving_migf) { + hisi_acc_vf_migf_save(hisi_acc_vdev, hisi_acc_vdev->saving_migf); hisi_acc_vf_disable_fd(hisi_acc_vdev->saving_migf); fput(hisi_acc_vdev->saving_migf->filp); hisi_acc_vdev->saving_migf = NULL; @@ -1137,6 +1156,7 @@ static int hisi_acc_vf_qm_init(struct hisi_acc_vf_core_device *hisi_acc_vdev) if (!vf_qm->io_base) return -EIO; + mutex_init(&hisi_acc_vdev->enable_mutex); vf_qm->fun_type = QM_HW_VF; vf_qm->pdev = vf_dev; mutex_init(&vf_qm->mailbox_lock); @@ -1287,6 +1307,181 @@ static long hisi_acc_vfio_pci_ioctl(struct vfio_device *core_vdev, unsigned int return vfio_pci_core_ioctl(core_vdev, cmd, arg); } +static int hisi_acc_vf_debug_check(struct seq_file *seq, struct vfio_device *vdev) +{ + struct hisi_acc_vf_core_device *hisi_acc_vdev = hisi_acc_get_vf_dev(vdev); + struct hisi_acc_vf_migration_file *migf = hisi_acc_vdev->debug_migf; + struct hisi_qm *vf_qm = &hisi_acc_vdev->vf_qm; + int ret; + + if (!vdev->mig_ops || !migf) { + seq_printf(seq, "%s\n", "device does not support live migration!"); + return -EINVAL; + } + + /** + * When the device is not opened, the io_base is not mapped. + * The driver cannot perform device read and write operations. + */ + if (hisi_acc_vdev->dev_opened != DEV_OPEN) { + seq_printf(seq, "%s\n", "device not opened!"); + return -EINVAL; + } + + ret = qm_wait_dev_not_ready(vf_qm); + if (ret) { + seq_printf(seq, "%s\n", "VF device not ready!"); + return -EINVAL; + } + + return 0; +} + +static int hisi_acc_vf_debug_cmd(struct seq_file *seq, void *data) +{ + struct device *vf_dev = seq->private; + struct vfio_pci_core_device *core_device = dev_get_drvdata(vf_dev); + struct vfio_device *vdev = &core_device->vdev; + struct hisi_acc_vf_core_device *hisi_acc_vdev = hisi_acc_get_vf_dev(vdev); + struct hisi_qm *vf_qm = &hisi_acc_vdev->vf_qm; + u64 value; + int ret; + + mutex_lock(&hisi_acc_vdev->enable_mutex); + ret = hisi_acc_vf_debug_check(seq, vdev); + if (ret) { + mutex_unlock(&hisi_acc_vdev->enable_mutex); + return 0; + } + + value = readl(vf_qm->io_base + QM_MB_CMD_SEND_BASE); + mutex_unlock(&hisi_acc_vdev->enable_mutex); + seq_printf(seq, "%s:0x%llx\n", "mailbox cmd channel state is OK", value); + + return 0; +} + +static int hisi_acc_vf_debug_save(struct seq_file *seq, void *data) +{ + struct device *vf_dev = seq->private; + struct vfio_pci_core_device *core_device = dev_get_drvdata(vf_dev); + struct vfio_device *vdev = &core_device->vdev; + struct hisi_acc_vf_core_device *hisi_acc_vdev = hisi_acc_get_vf_dev(vdev); + struct hisi_acc_vf_migration_file *migf = hisi_acc_vdev->debug_migf; + struct acc_vf_data *vf_data = &migf->vf_data; + int ret; + + mutex_lock(&hisi_acc_vdev->enable_mutex); + ret = hisi_acc_vf_debug_check(seq, vdev); + if (ret) { + mutex_unlock(&hisi_acc_vdev->enable_mutex); + return 0; + } + + vf_data->vf_qm_state = QM_READY; + ret = vf_qm_read_data(&hisi_acc_vdev->vf_qm, vf_data); + if (ret) { + mutex_unlock(&hisi_acc_vdev->enable_mutex); + seq_printf(seq, "%s\n", "failed to save device data!"); + return 0; + } + + migf->total_length = sizeof(struct acc_vf_data); + mutex_unlock(&hisi_acc_vdev->enable_mutex); + seq_printf(seq, "%s\n", "successful to save device data!"); + + return 0; +} + +static int hisi_acc_vf_data_read(struct seq_file *seq, void *data) +{ + struct device *vf_dev = seq->private; + struct vfio_pci_core_device *core_device = dev_get_drvdata(vf_dev); + struct vfio_device *vdev = &core_device->vdev; + struct hisi_acc_vf_core_device *hisi_acc_vdev = hisi_acc_get_vf_dev(vdev); + struct hisi_acc_vf_migration_file *debug_migf = hisi_acc_vdev->debug_migf; + size_t vf_data_sz = offsetofend(struct acc_vf_data, padding); + + if (debug_migf && debug_migf->total_length) + seq_hex_dump(seq, "Mig Data:", DUMP_PREFIX_OFFSET, 16, 1, + (unsigned char *)&debug_migf->vf_data, + vf_data_sz, false); + else + seq_printf(seq, "%s\n", "device not migrated!"); + + return 0; +} + +static int hisi_acc_vf_attr_read(struct seq_file *seq, void *data) +{ + struct device *vf_dev = seq->private; + struct vfio_pci_core_device *core_device = dev_get_drvdata(vf_dev); + struct vfio_device *vdev = &core_device->vdev; + struct hisi_acc_vf_core_device *hisi_acc_vdev = hisi_acc_get_vf_dev(vdev); + struct hisi_acc_vf_migration_file *debug_migf = hisi_acc_vdev->debug_migf; + + if (debug_migf && debug_migf->total_length) { + seq_printf(seq, + "acc device:\n" + "device state: %d\n" + "device ready: %u\n" + "data valid: %d\n" + "data size: %lu\n", + hisi_acc_vdev->mig_state, + hisi_acc_vdev->vf_qm_state, + debug_migf->disabled, + debug_migf->total_length); + } else { + seq_printf(seq, "%s\n", "device not migrated!"); + } + + return 0; +} + +static int hisi_acc_vfio_debug_init(struct hisi_acc_vf_core_device *hisi_acc_vdev) +{ + struct vfio_device *vdev = &hisi_acc_vdev->core_device.vdev; + struct dentry *vfio_dev_migration = NULL; + struct dentry *vfio_hisi_acc = NULL; + struct device *dev = vdev->dev; + void *migf = NULL; + + if (!debugfs_initialized()) + return 0; + + migf = kzalloc(sizeof(struct hisi_acc_vf_migration_file), GFP_KERNEL); + if (!migf) + return -ENOMEM; + hisi_acc_vdev->debug_migf = migf; + + vfio_dev_migration = debugfs_lookup("migration", vdev->debug_root); + if (!vfio_dev_migration) { + kfree(migf); + dev_err(dev, "failed to lookup migration debugfs file!\n"); + return -ENODEV; + } + + vfio_hisi_acc = debugfs_create_dir("hisi_acc", vfio_dev_migration); + debugfs_create_devm_seqfile(dev, "data", vfio_hisi_acc, + hisi_acc_vf_data_read); + debugfs_create_devm_seqfile(dev, "attr", vfio_hisi_acc, + hisi_acc_vf_attr_read); + debugfs_create_devm_seqfile(dev, "cmd_state", vfio_hisi_acc, + hisi_acc_vf_debug_cmd); + debugfs_create_devm_seqfile(dev, "save", vfio_hisi_acc, + hisi_acc_vf_debug_save); + + return 0; +} + +static void hisi_acc_vf_debugfs_exit(struct hisi_acc_vf_core_device *hisi_acc_vdev) +{ + if (!debugfs_initialized()) + return; + + kfree(hisi_acc_vdev->debug_migf); +} + static int hisi_acc_vfio_pci_open_device(struct vfio_device *core_vdev) { struct hisi_acc_vf_core_device *hisi_acc_vdev = hisi_acc_get_vf_dev(core_vdev); @@ -1304,9 +1499,11 @@ static int hisi_acc_vfio_pci_open_device(struct vfio_device *core_vdev) return ret; } hisi_acc_vdev->mig_state = VFIO_DEVICE_STATE_RUNNING; + hisi_acc_vdev->dev_opened = DEV_OPEN; } vfio_pci_core_finish_enable(vdev); + return 0; } @@ -1315,7 +1512,10 @@ static void hisi_acc_vfio_pci_close_device(struct vfio_device *core_vdev) struct hisi_acc_vf_core_device *hisi_acc_vdev = hisi_acc_get_vf_dev(core_vdev); struct hisi_qm *vf_qm = &hisi_acc_vdev->vf_qm; + hisi_acc_vdev->dev_opened = DEV_CLOSE; + mutex_lock(&hisi_acc_vdev->enable_mutex); iounmap(vf_qm->io_base); + mutex_unlock(&hisi_acc_vdev->enable_mutex); vfio_pci_core_close_device(core_vdev); } @@ -1406,6 +1606,9 @@ static int hisi_acc_vfio_pci_probe(struct pci_dev *pdev, const struct pci_device ret = vfio_pci_core_register_device(&hisi_acc_vdev->core_device); if (ret) goto out_put_vdev; + + if (ops == &hisi_acc_vfio_pci_migrn_ops) + hisi_acc_vfio_debug_init(hisi_acc_vdev); return 0; out_put_vdev: @@ -1418,6 +1621,7 @@ static void hisi_acc_vfio_pci_remove(struct pci_dev *pdev) struct hisi_acc_vf_core_device *hisi_acc_vdev = hisi_acc_drvdata(pdev); vfio_pci_core_unregister_device(&hisi_acc_vdev->core_device); + hisi_acc_vf_debugfs_exit(hisi_acc_vdev); vfio_put_device(&hisi_acc_vdev->core_device.vdev); } diff --git a/drivers/vfio/pci/hisilicon/hisi_acc_vfio_pci.h b/drivers/vfio/pci/hisilicon/hisi_acc_vfio_pci.h index 7a9dc87627cd..3a20d81d105c 100644 --- a/drivers/vfio/pci/hisilicon/hisi_acc_vfio_pci.h +++ b/drivers/vfio/pci/hisilicon/hisi_acc_vfio_pci.h @@ -52,6 +52,11 @@ #define QM_EQC_DW0 0X8000 #define QM_AEQC_DW0 0X8020 +enum acc_dev_state { + DEV_CLOSE = 0x0, + DEV_OPEN, +}; + struct acc_vf_data { #define QM_MATCH_SIZE offsetofend(struct acc_vf_data, qm_rsv_state) /* QM match information */ @@ -114,5 +119,11 @@ struct hisi_acc_vf_core_device { int vf_id; struct hisi_acc_vf_migration_file *resuming_migf; struct hisi_acc_vf_migration_file *saving_migf; + + /* To make sure the device is enabled */ + struct mutex enable_mutex; + bool dev_opened; + /* For debugfs */ + struct hisi_acc_vf_migration_file *debug_migf; }; #endif /* HISI_ACC_VFIO_PCI_H */ From patchwork Thu Mar 7 06:36:08 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Longfang Liu X-Patchwork-Id: 13585130 Received: from szxga04-in.huawei.com (szxga04-in.huawei.com [45.249.212.190]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 7AB701BF47; Thu, 7 Mar 2024 06:41:10 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; 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spf=pass smtp.mailfrom=huawei.com Received: from mail.maildlp.com (unknown [172.19.88.234]) by szxga04-in.huawei.com (SkyGuard) with ESMTP id 4Tr04k1Fzmz2BfVw; Thu, 7 Mar 2024 14:38:46 +0800 (CST) Received: from kwepemm600005.china.huawei.com (unknown [7.193.23.191]) by mail.maildlp.com (Postfix) with ESMTPS id 0B863140336; Thu, 7 Mar 2024 14:41:08 +0800 (CST) Received: from huawei.com (10.50.165.33) by kwepemm600005.china.huawei.com (7.193.23.191) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.1.2507.35; Thu, 7 Mar 2024 14:41:07 +0800 From: Longfang Liu To: , , , CC: , , , Subject: [PATCH v3 4/4] Documentation: add debugfs description for hisi migration Date: Thu, 7 Mar 2024 14:36:08 +0800 Message-ID: <20240307063608.26729-2-liulongfang@huawei.com> X-Mailer: git-send-email 2.24.0 In-Reply-To: <20240307063608.26729-1-liulongfang@huawei.com> References: <20240307063608.26729-1-liulongfang@huawei.com> Precedence: bulk X-Mailing-List: kvm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-ClientProxiedBy: dggems703-chm.china.huawei.com (10.3.19.180) To kwepemm600005.china.huawei.com (7.193.23.191) Add a debugfs document description file to help users understand how to use the hisilicon accelerator live migration driver's debugfs. Update the file paths that need to be maintained in MAINTAINERS Signed-off-by: Longfang Liu --- .../ABI/testing/debugfs-hisi-migration | 34 +++++++++++++++++++ MAINTAINERS | 1 + 2 files changed, 35 insertions(+) create mode 100644 Documentation/ABI/testing/debugfs-hisi-migration diff --git a/Documentation/ABI/testing/debugfs-hisi-migration b/Documentation/ABI/testing/debugfs-hisi-migration new file mode 100644 index 000000000000..7111af41ed05 --- /dev/null +++ b/Documentation/ABI/testing/debugfs-hisi-migration @@ -0,0 +1,34 @@ +What: /sys/kernel/debug/vfio//migration/hisi_acc/data +Date: Mar 2024 +KernelVersion: 6.8 +Contact: Longfang Liu +Description: Read the live migration data of the vfio device. + These data include device status data, queue configuration + data and some task configuration data. + The output format of the data is defined by the live + migration driver. + +What: /sys/kernel/debug/vfio//migration/hisi_acc/attr +Date: Mar 2024 +KernelVersion: 6.8 +Contact: Longfang Liu +Description: Read the live migration attributes of the vfio device. + it include device status attributes and data length attributes + The output format of the attributes is defined by the live + migration driver. + +What: /sys/kernel/debug/vfio//migration/hisi_acc/cmd_state +Date: Mar 2024 +KernelVersion: 6.8 +Contact: Longfang Liu +Description: Used to obtain the device command sending and receiving + channel status. If successful, returns the command value. + If failed, return error log. + +What: /sys/kernel/debug/vfio//migration/hisi_acc/save +Date: Mar 2024 +KernelVersion: 6.8 +Contact: Longfang Liu +Description: Trigger the Hisilicon accelerator device to perform + the state saving operation of live migration through the read + operation, and output the operation log results. diff --git a/MAINTAINERS b/MAINTAINERS index 7625911ec2f1..8c2d13b13273 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -23072,6 +23072,7 @@ M: Longfang Liu M: Shameer Kolothum L: kvm@vger.kernel.org S: Maintained +F: Documentation/ABI/testing/debugfs-hisi-migration F: drivers/vfio/pci/hisilicon/ VFIO MEDIATED DEVICE DRIVERS