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dkim=none (message not signed) header.d=none;infradead.org; dmarc=none action=none header.from=nxp.com; Received: from VI1PR04MB4960.eurprd04.prod.outlook.com (2603:10a6:803:57::21) by VI1PR04MB3229.eurprd04.prod.outlook.com (2603:10a6:802:e::30) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.3455.28; Wed, 28 Oct 2020 02:04:18 +0000 Received: from VI1PR04MB4960.eurprd04.prod.outlook.com ([fe80::b178:a37b:1f9e:3a6]) by VI1PR04MB4960.eurprd04.prod.outlook.com ([fe80::b178:a37b:1f9e:3a6%3]) with mapi id 15.20.3477.028; Wed, 28 Oct 2020 02:04:18 +0000 From: Sherry Sun To: hch@infradead.org, gregkh@linuxfoundation.org, vincent.whitchurch@axis.com, sudeep.dutt@intel.com, ashutosh.dixit@intel.com, arnd@arndb.de, kishon@ti.com, lorenzo.pieralisi@arm.com Cc: linux-kernel@vger.kernel.org, linux-pci@vger.kernel.org, linux-imx@nxp.com, fugang.duan@nxp.com Subject: [PATCH V5 1/2] misc: vop: change the way of allocating vrings and device page Date: Wed, 28 Oct 2020 10:03:04 +0800 Message-Id: <20201028020305.10593-2-sherry.sun@nxp.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20201028020305.10593-1-sherry.sun@nxp.com> References: <20201028020305.10593-1-sherry.sun@nxp.com> X-Originating-IP: [119.31.174.71] X-ClientProxiedBy: AM0PR03CA0088.eurprd03.prod.outlook.com (2603:10a6:208:69::29) To VI1PR04MB4960.eurprd04.prod.outlook.com (2603:10a6:803:57::21) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 Received: from nxp.ap.freescale.net (119.31.174.71) by AM0PR03CA0088.eurprd03.prod.outlook.com (2603:10a6:208:69::29) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.3499.18 via Frontend Transport; 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X-MS-Exchange-AntiSpam-MessageData: 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 X-MS-Exchange-CrossTenant-Network-Message-Id: 944d90e6-522b-4735-ab00-08d87ae5c737 X-MS-Exchange-CrossTenant-AuthSource: VI1PR04MB4960.eurprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 28 Oct 2020 02:04:18.7425 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 686ea1d3-bc2b-4c6f-a92c-d99c5c301635 X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: DNoM1sUdemNGj+U1eYCgYim22LcEd+X6jDaRlb/7HDcbpNikhizEgbAWIR+BH0ZVIjeo8IbsejjmJHMpeMJRVQ== X-MS-Exchange-Transport-CrossTenantHeadersStamped: VI1PR04MB3229 X-OriginatorOrg: nxp.com Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org Allocate vrings use dma_alloc_coherent is a common way in kernel. As the memory interacted between two systems should use consistent memory to avoid caching effects, same as device page memory. The orginal way use __get_free_pages and dma_map_single to allocate and map vring, but not use dma_sync_single_for_cpu/device api to sync the changes of vring between EP and RC, which will cause memory synchronization problem for those devices which don't support hardware dma coherent. Also change to use dma_mmap_coherent for mmap callback to map the device page and vring memory to userspace. Signed-off-by: Christoph Hellwig Signed-off-by: Sherry Sun Signed-off-by: Joakim Zhang --- drivers/misc/mic/bus/vop_bus.h | 2 + drivers/misc/mic/host/mic_boot.c | 9 ++ drivers/misc/mic/host/mic_main.c | 43 +++------- drivers/misc/mic/vop/vop_vringh.c | 135 ++++++++++++------------------ 4 files changed, 77 insertions(+), 112 deletions(-) diff --git a/drivers/misc/mic/bus/vop_bus.h b/drivers/misc/mic/bus/vop_bus.h index 4fa02808c1e2..e21c06aeda7a 100644 --- a/drivers/misc/mic/bus/vop_bus.h +++ b/drivers/misc/mic/bus/vop_bus.h @@ -75,6 +75,7 @@ struct vop_driver { * node to add/remove/configure virtio devices. * @get_dp: Get access to the virtio device page used by the self * node to add/remove/configure virtio devices. + * @dp_mmap: Map the virtio device page to userspace. * @send_intr: Send an interrupt to the peer node on a specified doorbell. * @remap: Map a buffer with the specified DMA address and length. * @unmap: Unmap a buffer previously mapped. @@ -92,6 +93,7 @@ struct vop_hw_ops { void (*ack_interrupt)(struct vop_device *vpdev, int num); void __iomem * (*get_remote_dp)(struct vop_device *vpdev); void * (*get_dp)(struct vop_device *vpdev); + int (*dp_mmap)(struct vop_device *vpdev, struct vm_area_struct *vma); void (*send_intr)(struct vop_device *vpdev, int db); void __iomem * (*remap)(struct vop_device *vpdev, dma_addr_t pa, size_t len); diff --git a/drivers/misc/mic/host/mic_boot.c b/drivers/misc/mic/host/mic_boot.c index 8cb85b8b3e19..44ed918b49b4 100644 --- a/drivers/misc/mic/host/mic_boot.c +++ b/drivers/misc/mic/host/mic_boot.c @@ -89,6 +89,14 @@ static void *__mic_get_dp(struct vop_device *vpdev) return mdev->dp; } +static int __mic_dp_mmap(struct vop_device *vpdev, struct vm_area_struct *vma) +{ + struct mic_device *mdev = vpdev_to_mdev(&vpdev->dev); + + return dma_mmap_coherent(&mdev->pdev->dev, vma, mdev->dp, + mdev->dp_dma_addr, MIC_DP_SIZE); +} + static void __iomem *__mic_get_remote_dp(struct vop_device *vpdev) { return NULL; @@ -120,6 +128,7 @@ static struct vop_hw_ops vop_hw_ops = { .ack_interrupt = __mic_ack_interrupt, .next_db = __mic_next_db, .get_dp = __mic_get_dp, + .dp_mmap = __mic_dp_mmap, .get_remote_dp = __mic_get_remote_dp, .send_intr = __mic_send_intr, .remap = __mic_ioremap, diff --git a/drivers/misc/mic/host/mic_main.c b/drivers/misc/mic/host/mic_main.c index ea4608527ea0..fab87a72a9a4 100644 --- a/drivers/misc/mic/host/mic_main.c +++ b/drivers/misc/mic/host/mic_main.c @@ -10,6 +10,7 @@ #include #include #include +#include #include #include "../common/mic_dev.h" @@ -45,33 +46,6 @@ MODULE_DEVICE_TABLE(pci, mic_pci_tbl); /* ID allocator for MIC devices */ static struct ida g_mic_ida; -/* Initialize the device page */ -static int mic_dp_init(struct mic_device *mdev) -{ - mdev->dp = kzalloc(MIC_DP_SIZE, GFP_KERNEL); - if (!mdev->dp) - return -ENOMEM; - - mdev->dp_dma_addr = mic_map_single(mdev, - mdev->dp, MIC_DP_SIZE); - if (mic_map_error(mdev->dp_dma_addr)) { - kfree(mdev->dp); - dev_err(&mdev->pdev->dev, "%s %d err %d\n", - __func__, __LINE__, -ENOMEM); - return -ENOMEM; - } - mdev->ops->write_spad(mdev, MIC_DPLO_SPAD, mdev->dp_dma_addr); - mdev->ops->write_spad(mdev, MIC_DPHI_SPAD, mdev->dp_dma_addr >> 32); - return 0; -} - -/* Uninitialize the device page */ -static void mic_dp_uninit(struct mic_device *mdev) -{ - mic_unmap_single(mdev, mdev->dp_dma_addr, MIC_DP_SIZE); - kfree(mdev->dp); -} - /** * mic_ops_init: Initialize HW specific operation tables. * @@ -227,11 +201,16 @@ static int mic_probe(struct pci_dev *pdev, pci_set_drvdata(pdev, mdev); - rc = mic_dp_init(mdev); - if (rc) { - dev_err(&pdev->dev, "mic_dp_init failed rc %d\n", rc); + mdev->dp = dma_alloc_coherent(&pdev->dev, MIC_DP_SIZE, + &mdev->dp_dma_addr, GFP_KERNEL); + if (!mdev->dp) { + dev_err(&pdev->dev, "failed to allocate device page\n"); goto smpt_uninit; } + + mdev->ops->write_spad(mdev, MIC_DPLO_SPAD, mdev->dp_dma_addr); + mdev->ops->write_spad(mdev, MIC_DPHI_SPAD, mdev->dp_dma_addr >> 32); + mic_bootparam_init(mdev); mic_create_debug_dir(mdev); @@ -244,7 +223,7 @@ static int mic_probe(struct pci_dev *pdev, return 0; cleanup_debug_dir: mic_delete_debug_dir(mdev); - mic_dp_uninit(mdev); + dma_free_coherent(&pdev->dev, MIC_DP_SIZE, mdev->dp, mdev->dp_dma_addr); smpt_uninit: mic_smpt_uninit(mdev); free_interrupts: @@ -283,7 +262,7 @@ static void mic_remove(struct pci_dev *pdev) cosm_unregister_device(mdev->cosm_dev); mic_delete_debug_dir(mdev); - mic_dp_uninit(mdev); + dma_free_coherent(&pdev->dev, MIC_DP_SIZE, mdev->dp, mdev->dp_dma_addr); mic_smpt_uninit(mdev); mic_free_interrupts(mdev, pdev); iounmap(mdev->aper.va); diff --git a/drivers/misc/mic/vop/vop_vringh.c b/drivers/misc/mic/vop/vop_vringh.c index 7014ffe88632..39d34b164ede 100644 --- a/drivers/misc/mic/vop/vop_vringh.c +++ b/drivers/misc/mic/vop/vop_vringh.c @@ -298,9 +298,8 @@ static int vop_virtio_add_device(struct vop_vdev *vdev, mutex_init(&vvr->vr_mutex); vr_size = PAGE_ALIGN(round_up(vring_size(num, MIC_VIRTIO_RING_ALIGN), 4) + sizeof(struct _mic_vring_info)); - vr->va = (void *) - __get_free_pages(GFP_KERNEL | __GFP_ZERO, - get_order(vr_size)); + vr->va = dma_alloc_coherent(vop_dev(vdev), vr_size, &vr_addr, + GFP_KERNEL); if (!vr->va) { ret = -ENOMEM; dev_err(vop_dev(vdev), "%s %d err %d\n", @@ -310,15 +309,6 @@ static int vop_virtio_add_device(struct vop_vdev *vdev, vr->len = vr_size; vr->info = vr->va + round_up(vring_size(num, MIC_VIRTIO_RING_ALIGN), 4); vr->info->magic = cpu_to_le32(MIC_MAGIC + vdev->virtio_id + i); - vr_addr = dma_map_single(&vpdev->dev, vr->va, vr_size, - DMA_BIDIRECTIONAL); - if (dma_mapping_error(&vpdev->dev, vr_addr)) { - free_pages((unsigned long)vr->va, get_order(vr_size)); - ret = -ENOMEM; - dev_err(vop_dev(vdev), "%s %d err %d\n", - __func__, __LINE__, ret); - goto err; - } vqconfig[i].address = cpu_to_le64(vr_addr); vring_init(&vr->vr, num, vr->va, MIC_VIRTIO_RING_ALIGN); @@ -339,11 +329,9 @@ static int vop_virtio_add_device(struct vop_vdev *vdev, dev_dbg(&vpdev->dev, "%s %d index %d va %p info %p vr_size 0x%x\n", __func__, __LINE__, i, vr->va, vr->info, vr_size); - vvr->buf = (void *)__get_free_pages(GFP_KERNEL, - get_order(VOP_INT_DMA_BUF_SIZE)); - vvr->buf_da = dma_map_single(&vpdev->dev, - vvr->buf, VOP_INT_DMA_BUF_SIZE, - DMA_BIDIRECTIONAL); + vvr->buf = dma_alloc_coherent(vop_dev(vdev), + VOP_INT_DMA_BUF_SIZE, + &vvr->buf_da, GFP_KERNEL); } snprintf(irqname, sizeof(irqname), "vop%dvirtio%d", vpdev->index, @@ -382,10 +370,8 @@ static int vop_virtio_add_device(struct vop_vdev *vdev, for (j = 0; j < i; j++) { struct vop_vringh *vvr = &vdev->vvr[j]; - dma_unmap_single(&vpdev->dev, le64_to_cpu(vqconfig[j].address), - vvr->vring.len, DMA_BIDIRECTIONAL); - free_pages((unsigned long)vvr->vring.va, - get_order(vvr->vring.len)); + dma_free_coherent(vop_dev(vdev), vvr->vring.len, vvr->vring.va, + le64_to_cpu(vqconfig[j].address)); } return ret; } @@ -433,17 +419,12 @@ static void vop_virtio_del_device(struct vop_vdev *vdev) for (i = 0; i < vdev->dd->num_vq; i++) { struct vop_vringh *vvr = &vdev->vvr[i]; - dma_unmap_single(&vpdev->dev, - vvr->buf_da, VOP_INT_DMA_BUF_SIZE, - DMA_BIDIRECTIONAL); - free_pages((unsigned long)vvr->buf, - get_order(VOP_INT_DMA_BUF_SIZE)); + dma_free_coherent(vop_dev(vdev), VOP_INT_DMA_BUF_SIZE, + vvr->buf, vvr->buf_da); vringh_kiov_cleanup(&vvr->riov); vringh_kiov_cleanup(&vvr->wiov); - dma_unmap_single(&vpdev->dev, le64_to_cpu(vqconfig[i].address), - vvr->vring.len, DMA_BIDIRECTIONAL); - free_pages((unsigned long)vvr->vring.va, - get_order(vvr->vring.len)); + dma_free_coherent(vop_dev(vdev), vvr->vring.len, vvr->vring.va, + le64_to_cpu(vqconfig[i].address)); } /* * Order the type update with previous stores. This write barrier @@ -1042,13 +1023,27 @@ static __poll_t vop_poll(struct file *f, poll_table *wait) return mask; } -static inline int -vop_query_offset(struct vop_vdev *vdev, unsigned long offset, - unsigned long *size, unsigned long *pa) +/* + * Maps the device page and virtio rings to user space for readonly access. + */ +static int vop_mmap(struct file *f, struct vm_area_struct *vma) { - struct vop_device *vpdev = vdev->vpdev; - unsigned long start = MIC_DP_SIZE; - int i; + struct vop_vdev *vdev = f->private_data; + struct mic_vqconfig *vqconfig = mic_vq_config(vdev->dd); + unsigned long orig_start = vma->vm_start; + unsigned long orig_end = vma->vm_end; + int err, i; + + if (!vdev->vpdev->hw_ops->dp_mmap) + return -EINVAL; + if (vma->vm_pgoff) + return -EINVAL; + if (vma->vm_flags & VM_WRITE) + return -EACCES; + + err = vop_vdev_inited(vdev); + if (err) + return err; /* * MMAP interface is as follows: @@ -1057,58 +1052,38 @@ vop_query_offset(struct vop_vdev *vdev, unsigned long offset, * 0x1000 first vring * 0x1000 + size of 1st vring second vring * .... + * + * We manipulate vm_start/vm_end to trick dma_mmap_coherent into + * performing partial mappings, which is a bit of a hack, but safe + * while we are under mmap_lock(). Eventually this needs to be + * replaced by a proper DMA layer API. */ - if (!offset) { - *pa = virt_to_phys(vpdev->hw_ops->get_dp(vpdev)); - *size = MIC_DP_SIZE; - return 0; - } + vma->vm_end = vma->vm_start + MIC_DP_SIZE; + err = vdev->vpdev->hw_ops->dp_mmap(vdev->vpdev, vma); + if (err) + goto out; for (i = 0; i < vdev->dd->num_vq; i++) { struct vop_vringh *vvr = &vdev->vvr[i]; - if (offset == start) { - *pa = virt_to_phys(vvr->vring.va); - *size = vvr->vring.len; - return 0; - } - start += vvr->vring.len; - } - return -1; -} + vma->vm_start = vma->vm_end; + vma->vm_end += vvr->vring.len; -/* - * Maps the device page and virtio rings to user space for readonly access. - */ -static int vop_mmap(struct file *f, struct vm_area_struct *vma) -{ - struct vop_vdev *vdev = f->private_data; - unsigned long offset = vma->vm_pgoff << PAGE_SHIFT; - unsigned long pa, size = vma->vm_end - vma->vm_start, size_rem = size; - int i, err; - - err = vop_vdev_inited(vdev); - if (err) - goto ret; - if (vma->vm_flags & VM_WRITE) { - err = -EACCES; - goto ret; - } - while (size_rem) { - i = vop_query_offset(vdev, offset, &size, &pa); - if (i < 0) { - err = -EINVAL; - goto ret; - } - err = remap_pfn_range(vma, vma->vm_start + offset, - pa >> PAGE_SHIFT, size, - vma->vm_page_prot); + err = -EINVAL; + if (vma->vm_end > orig_end) + goto out; + err = dma_mmap_coherent(vop_dev(vdev), vma, vvr->vring.va, + le64_to_cpu(vqconfig[i].address), + vvr->vring.len); if (err) - goto ret; - size_rem -= size; - offset += size; + goto out; } -ret: +out: + /* + * Restore the original vma parameters. + */ + vma->vm_start = orig_start; + vma->vm_end = orig_end; return err; } From patchwork Wed Oct 28 02:03:05 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sherry Sun X-Patchwork-Id: 1389491 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org (client-ip=23.128.96.18; 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Wed, 28 Oct 2020 02:04:24 +0000 From: Sherry Sun To: hch@infradead.org, gregkh@linuxfoundation.org, vincent.whitchurch@axis.com, sudeep.dutt@intel.com, ashutosh.dixit@intel.com, arnd@arndb.de, kishon@ti.com, lorenzo.pieralisi@arm.com Cc: linux-kernel@vger.kernel.org, linux-pci@vger.kernel.org, linux-imx@nxp.com, fugang.duan@nxp.com Subject: [PATCH V5 2/2] misc: vop: do not allocate and reassign the used ring Date: Wed, 28 Oct 2020 10:03:05 +0800 Message-Id: <20201028020305.10593-3-sherry.sun@nxp.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20201028020305.10593-1-sherry.sun@nxp.com> References: <20201028020305.10593-1-sherry.sun@nxp.com> X-Originating-IP: [119.31.174.71] X-ClientProxiedBy: AM0PR03CA0088.eurprd03.prod.outlook.com (2603:10a6:208:69::29) To VI1PR04MB4960.eurprd04.prod.outlook.com (2603:10a6:803:57::21) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 Received: from nxp.ap.freescale.net (119.31.174.71) by AM0PR03CA0088.eurprd03.prod.outlook.com (2603:10a6:208:69::29) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.3499.18 via Frontend Transport; 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X-MS-Exchange-AntiSpam-MessageData: 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 X-MS-Exchange-CrossTenant-Network-Message-Id: 0bf4c3c7-7a2b-487a-1633-08d87ae5caea X-MS-Exchange-CrossTenant-AuthSource: VI1PR04MB4960.eurprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 28 Oct 2020 02:04:24.6751 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 686ea1d3-bc2b-4c6f-a92c-d99c5c301635 X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: JpUwfqMBtRXPEiRgP97qxYlbiDK0xdXECj+H1IgCuutKOLEvnNIEWeqJR9ESBzwwUuJVhDktzol4DZh2iyk3QQ== X-MS-Exchange-Transport-CrossTenantHeadersStamped: VI1PR04MB3229 X-OriginatorOrg: nxp.com Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org We don't need to allocate and reassign the used ring here and remove the used_address_updated flag. Since RC has allocated the entire vring, including the used ring. Simply add the corresponding offset can get the used ring address. If following the orginal way to reassign the used ring, will encounter a problem. When host finished with descriptor, it will update the used ring with putused_kern api, if reassign used ring at EP side, used ring will be io device memory for RC, use memcpy in putused_kern will cause kernel panic. Signed-off-by: Sherry Sun Signed-off-by: Joakim Zhang --- drivers/misc/mic/vop/vop_debugfs.c | 4 -- drivers/misc/mic/vop/vop_main.c | 70 ++---------------------------- drivers/misc/mic/vop/vop_vringh.c | 31 ------------- include/uapi/linux/mic_common.h | 9 ++-- 4 files changed, 8 insertions(+), 106 deletions(-) diff --git a/drivers/misc/mic/vop/vop_debugfs.c b/drivers/misc/mic/vop/vop_debugfs.c index 9d4f175f4dd1..27373b6dcea2 100644 --- a/drivers/misc/mic/vop/vop_debugfs.c +++ b/drivers/misc/mic/vop/vop_debugfs.c @@ -62,8 +62,6 @@ static int vop_dp_show(struct seq_file *s, void *pos) seq_printf(s, "address 0x%llx ", vqconfig->address); seq_printf(s, "num %d ", vqconfig->num); - seq_printf(s, "used address 0x%llx\n", - vqconfig->used_address); } features = (__u32 *)mic_vq_features(d); @@ -79,8 +77,6 @@ static int vop_dp_show(struct seq_file *s, void *pos) seq_printf(s, "Vdev reset %d\n", dc->vdev_reset); seq_printf(s, "Guest Ack %d ", dc->guest_ack); seq_printf(s, "Host ack %d\n", dc->host_ack); - seq_printf(s, "Used address updated %d ", - dc->used_address_updated); seq_printf(s, "Vdev 0x%llx\n", dc->vdev); seq_printf(s, "c2h doorbell %d ", dc->c2h_vdev_db); seq_printf(s, "h2c doorbell %d\n", dc->h2c_vdev_db); diff --git a/drivers/misc/mic/vop/vop_main.c b/drivers/misc/mic/vop/vop_main.c index 714b94f42d38..226f462ab6a9 100644 --- a/drivers/misc/mic/vop/vop_main.c +++ b/drivers/misc/mic/vop/vop_main.c @@ -32,9 +32,6 @@ * @dc: Virtio device control * @vpdev: VOP device which is the parent for this virtio device * @vr: Buffer for accessing the VRING - * @used_virt: Virtual address of used ring - * @used: DMA address of used ring - * @used_size: Size of the used buffer * @reset_done: Track whether VOP reset is complete * @virtio_cookie: Cookie returned upon requesting a interrupt * @c2h_vdev_db: The doorbell used by the guest to interrupt the host @@ -47,9 +44,6 @@ struct _vop_vdev { struct mic_device_ctrl __iomem *dc; struct vop_device *vpdev; void __iomem *vr[VOP_MAX_VRINGS]; - void *used_virt[VOP_MAX_VRINGS]; - dma_addr_t used[VOP_MAX_VRINGS]; - int used_size[VOP_MAX_VRINGS]; struct completion reset_done; struct mic_irq *virtio_cookie; int c2h_vdev_db; @@ -250,10 +244,6 @@ static void vop_del_vq(struct virtqueue *vq, int n) struct _vop_vdev *vdev = to_vopvdev(vq->vdev); struct vop_device *vpdev = vdev->vpdev; - dma_unmap_single(&vpdev->dev, vdev->used[n], - vdev->used_size[n], DMA_BIDIRECTIONAL); - free_pages((unsigned long)vdev->used_virt[n], - get_order(vdev->used_size[n])); vring_del_virtqueue(vq); vpdev->hw_ops->unmap(vpdev, vdev->vr[n]); vdev->vr[n] = NULL; @@ -278,14 +268,12 @@ static struct virtqueue *vop_new_virtqueue(unsigned int index, void *pages, bool (*notify)(struct virtqueue *vq), void (*callback)(struct virtqueue *vq), - const char *name, - void *used) + const char *name) { bool weak_barriers = false; struct vring vring; vring_init(&vring, num, pages, MIC_VIRTIO_RING_ALIGN); - vring.used = used; return __vring_new_virtqueue(index, vring, vdev, weak_barriers, context, notify, callback, name); @@ -308,7 +296,6 @@ static struct virtqueue *vop_find_vq(struct virtio_device *dev, struct virtqueue *vq; void __iomem *va; struct _mic_vring_info __iomem *info; - void *used; int vr_size, _vr_size, err, magic; u8 type = ioread8(&vdev->desc->type); @@ -337,45 +324,16 @@ static struct virtqueue *vop_find_vq(struct virtio_device *dev, goto unmap; } - vdev->used_size[index] = PAGE_ALIGN(sizeof(__u16) * 3 + - sizeof(struct vring_used_elem) * - le16_to_cpu(config.num)); - used = (void *)__get_free_pages(GFP_KERNEL | __GFP_ZERO, - get_order(vdev->used_size[index])); - vdev->used_virt[index] = used; - if (!used) { - err = -ENOMEM; - dev_err(_vop_dev(vdev), "%s %d err %d\n", - __func__, __LINE__, err); - goto unmap; - } - vq = vop_new_virtqueue(index, le16_to_cpu(config.num), dev, ctx, (void __force *)va, vop_notify, callback, - name, used); + name); if (!vq) { err = -ENOMEM; - goto free_used; - } - - vdev->used[index] = dma_map_single(&vpdev->dev, used, - vdev->used_size[index], - DMA_BIDIRECTIONAL); - if (dma_mapping_error(&vpdev->dev, vdev->used[index])) { - err = -ENOMEM; - dev_err(_vop_dev(vdev), "%s %d err %d\n", - __func__, __LINE__, err); - goto del_vq; + goto unmap; } - writeq(vdev->used[index], &vqconfig->used_address); vq->priv = vdev; return vq; -del_vq: - vring_del_virtqueue(vq); -free_used: - free_pages((unsigned long)used, - get_order(vdev->used_size[index])); unmap: vpdev->hw_ops->unmap(vpdev, vdev->vr[index]); return ERR_PTR(err); @@ -388,9 +346,7 @@ static int vop_find_vqs(struct virtio_device *dev, unsigned nvqs, struct irq_affinity *desc) { struct _vop_vdev *vdev = to_vopvdev(dev); - struct vop_device *vpdev = vdev->vpdev; - struct mic_device_ctrl __iomem *dc = vdev->dc; - int i, err, retry, queue_idx = 0; + int i, err, queue_idx = 0; /* We must have this many virtqueues. */ if (nvqs > ioread8(&vdev->desc->num_vq)) @@ -412,24 +368,6 @@ static int vop_find_vqs(struct virtio_device *dev, unsigned nvqs, } } - iowrite8(1, &dc->used_address_updated); - /* - * Send an interrupt to the host to inform it that used - * rings have been re-assigned. - */ - vpdev->hw_ops->send_intr(vpdev, vdev->c2h_vdev_db); - for (retry = 100; --retry;) { - if (!ioread8(&dc->used_address_updated)) - break; - msleep(100); - } - - dev_dbg(_vop_dev(vdev), "%s: retry: %d\n", __func__, retry); - if (!retry) { - err = -ENODEV; - goto error; - } - return 0; error: vop_del_vqs(dev); diff --git a/drivers/misc/mic/vop/vop_vringh.c b/drivers/misc/mic/vop/vop_vringh.c index 39d34b164ede..fac46f3ca5fe 100644 --- a/drivers/misc/mic/vop/vop_vringh.c +++ b/drivers/misc/mic/vop/vop_vringh.c @@ -53,33 +53,6 @@ static void _vop_notify(struct vringh *vrh) vpdev->hw_ops->send_intr(vpdev, db); } -static void vop_virtio_init_post(struct vop_vdev *vdev) -{ - struct mic_vqconfig *vqconfig = mic_vq_config(vdev->dd); - struct vop_device *vpdev = vdev->vpdev; - int i, used_size; - - for (i = 0; i < vdev->dd->num_vq; i++) { - used_size = PAGE_ALIGN(sizeof(u16) * 3 + - sizeof(struct vring_used_elem) * - le16_to_cpu(vqconfig->num)); - if (!le64_to_cpu(vqconfig[i].used_address)) { - dev_warn(vop_dev(vdev), "used_address zero??\n"); - continue; - } - vdev->vvr[i].vrh.vring.used = - (void __force *)vpdev->hw_ops->remap( - vpdev, - le64_to_cpu(vqconfig[i].used_address), - used_size); - } - - vdev->dc->used_address_updated = 0; - - dev_info(vop_dev(vdev), "%s: device type %d LINKUP\n", - __func__, vdev->virtio_id); -} - static inline void vop_virtio_device_reset(struct vop_vdev *vdev) { int i; @@ -130,9 +103,6 @@ static void vop_bh_handler(struct work_struct *work) struct vop_vdev *vdev = container_of(work, struct vop_vdev, virtio_bh_work); - if (vdev->dc->used_address_updated) - vop_virtio_init_post(vdev); - if (vdev->dc->vdev_reset) vop_virtio_device_reset(vdev); @@ -250,7 +220,6 @@ static void vop_init_device_ctrl(struct vop_vdev *vdev, dc->guest_ack = 0; dc->vdev_reset = 0; dc->host_ack = 0; - dc->used_address_updated = 0; dc->c2h_vdev_db = -1; dc->h2c_vdev_db = -1; vdev->dc = dc; diff --git a/include/uapi/linux/mic_common.h b/include/uapi/linux/mic_common.h index 504e523f702c..9560fb033a7f 100644 --- a/include/uapi/linux/mic_common.h +++ b/include/uapi/linux/mic_common.h @@ -56,8 +56,7 @@ struct mic_device_desc { * @vdev_reset: Set to 1 by guest to indicate virtio device has been reset. * @guest_ack: Set to 1 by guest to ack a command. * @host_ack: Set to 1 by host to ack a command. - * @used_address_updated: Set to 1 by guest when the used address should be - * updated. + * @must_be_zero: Reserved because this bit is no longer needed. * @c2h_vdev_db: The doorbell number to be used by guest. Set by host. * @h2c_vdev_db: The doorbell number to be used by host. Set by guest. */ @@ -67,7 +66,7 @@ struct mic_device_ctrl { __u8 vdev_reset; __u8 guest_ack; __u8 host_ack; - __u8 used_address_updated; + __u8 must_be_zero; __s8 c2h_vdev_db; __s8 h2c_vdev_db; } __attribute__ ((aligned(8))); @@ -110,12 +109,12 @@ struct mic_device_page { * * @address: Guest/MIC physical address of the virtio ring * (avail and desc rings) - * @used_address: Guest/MIC physical address of the used ring + * @must_be_zero: Reserved because this bit is no longer needed. * @num: The number of entries in the virtio_ring */ struct mic_vqconfig { __le64 address; - __le64 used_address; + __le64 must_be_zero; __le16 num; } __attribute__ ((aligned(8)));