diff options
Diffstat (limited to 'drivers/misc/mic/host/mic_virtio.c')
| -rw-r--r-- | drivers/misc/mic/host/mic_virtio.c | 811 |
1 files changed, 0 insertions, 811 deletions
diff --git a/drivers/misc/mic/host/mic_virtio.c b/drivers/misc/mic/host/mic_virtio.c deleted file mode 100644 index 58b107a24a8b..000000000000 --- a/drivers/misc/mic/host/mic_virtio.c +++ /dev/null @@ -1,811 +0,0 @@ -/* - * Intel MIC Platform Software Stack (MPSS) - * - * Copyright(c) 2013 Intel Corporation. - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License, version 2, as - * published by the Free Software Foundation. - * - * This program is distributed in the hope that it will be useful, but - * WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - * General Public License for more details. - * - * The full GNU General Public License is included in this distribution in - * the file called "COPYING". - * - * Intel MIC Host driver. - * - */ -#include <linux/pci.h> -#include <linux/sched.h> -#include <linux/uaccess.h> -#include <linux/dmaengine.h> -#include <linux/mic_common.h> -#include "../common/mic_dev.h" -#include "mic_device.h" -#include "mic_smpt.h" -#include "mic_virtio.h" - -/* - * Size of the internal buffer used during DMA's as an intermediate buffer - * for copy to/from user. - */ -#define MIC_INT_DMA_BUF_SIZE PAGE_ALIGN(64 * 1024ULL) - -static int mic_sync_dma(struct mic_device *mdev, dma_addr_t dst, - dma_addr_t src, size_t len) -{ - int err = 0; - struct dma_async_tx_descriptor *tx; - struct dma_chan *mic_ch = mdev->dma_ch[0]; - - if (!mic_ch) { - err = -EBUSY; - goto error; - } - - tx = mic_ch->device->device_prep_dma_memcpy(mic_ch, dst, src, len, - DMA_PREP_FENCE); - if (!tx) { - err = -ENOMEM; - goto error; - } else { - dma_cookie_t cookie = tx->tx_submit(tx); - - err = dma_submit_error(cookie); - if (err) - goto error; - err = dma_sync_wait(mic_ch, cookie); - } -error: - if (err) - dev_err(&mdev->pdev->dev, "%s %d err %d\n", - __func__, __LINE__, err); - return err; -} - -/* - * Initiates the copies across the PCIe bus from card memory to a user - * space buffer. When transfers are done using DMA, source/destination - * addresses and transfer length must follow the alignment requirements of - * the MIC DMA engine. - */ -static int mic_virtio_copy_to_user(struct mic_vdev *mvdev, void __user *ubuf, - size_t len, u64 daddr, size_t dlen, - int vr_idx) -{ - struct mic_device *mdev = mvdev->mdev; - void __iomem *dbuf = mdev->aper.va + daddr; - struct mic_vringh *mvr = &mvdev->mvr[vr_idx]; - size_t dma_alignment = 1 << mdev->dma_ch[0]->device->copy_align; - size_t dma_offset; - size_t partlen; - int err; - - dma_offset = daddr - round_down(daddr, dma_alignment); - daddr -= dma_offset; - len += dma_offset; - - while (len) { - partlen = min_t(size_t, len, MIC_INT_DMA_BUF_SIZE); - - err = mic_sync_dma(mdev, mvr->buf_da, daddr, - ALIGN(partlen, dma_alignment)); - if (err) - goto err; - - if (copy_to_user(ubuf, mvr->buf + dma_offset, - partlen - dma_offset)) { - err = -EFAULT; - goto err; - } - daddr += partlen; - ubuf += partlen; - dbuf += partlen; - mvdev->in_bytes_dma += partlen; - mvdev->in_bytes += partlen; - len -= partlen; - dma_offset = 0; - } - return 0; -err: - dev_err(mic_dev(mvdev), "%s %d err %d\n", __func__, __LINE__, err); - return err; -} - -/* - * Initiates copies across the PCIe bus from a user space buffer to card - * memory. When transfers are done using DMA, source/destination addresses - * and transfer length must follow the alignment requirements of the MIC - * DMA engine. - */ -static int mic_virtio_copy_from_user(struct mic_vdev *mvdev, void __user *ubuf, - size_t len, u64 daddr, size_t dlen, - int vr_idx) -{ - struct mic_device *mdev = mvdev->mdev; - void __iomem *dbuf = mdev->aper.va + daddr; - struct mic_vringh *mvr = &mvdev->mvr[vr_idx]; - size_t dma_alignment = 1 << mdev->dma_ch[0]->device->copy_align; - size_t partlen; - int err; - - if (daddr & (dma_alignment - 1)) { - mvdev->tx_dst_unaligned += len; - goto memcpy; - } else if (ALIGN(len, dma_alignment) > dlen) { - mvdev->tx_len_unaligned += len; - goto memcpy; - } - - while (len) { - partlen = min_t(size_t, len, MIC_INT_DMA_BUF_SIZE); - - if (copy_from_user(mvr->buf, ubuf, partlen)) { - err = -EFAULT; - goto err; - } - err = mic_sync_dma(mdev, daddr, mvr->buf_da, - ALIGN(partlen, dma_alignment)); - if (err) - goto err; - daddr += partlen; - ubuf += partlen; - dbuf += partlen; - mvdev->out_bytes_dma += partlen; - mvdev->out_bytes += partlen; - len -= partlen; - } -memcpy: - /* - * We are copying to IO below and should ideally use something - * like copy_from_user_toio(..) if it existed. - */ - if (copy_from_user((void __force *)dbuf, ubuf, len)) { - err = -EFAULT; - goto err; - } - mvdev->out_bytes += len; - return 0; -err: - dev_err(mic_dev(mvdev), "%s %d err %d\n", __func__, __LINE__, err); - return err; -} - -#define MIC_VRINGH_READ true - -/* The function to call to notify the card about added buffers */ -static void mic_notify(struct vringh *vrh) -{ - struct mic_vringh *mvrh = container_of(vrh, struct mic_vringh, vrh); - struct mic_vdev *mvdev = mvrh->mvdev; - s8 db = mvdev->dc->h2c_vdev_db; - - if (db != -1) - mvdev->mdev->ops->send_intr(mvdev->mdev, db); -} - -/* Determine the total number of bytes consumed in a VRINGH KIOV */ -static inline u32 mic_vringh_iov_consumed(struct vringh_kiov *iov) -{ - int i; - u32 total = iov->consumed; - - for (i = 0; i < iov->i; i++) - total += iov->iov[i].iov_len; - return total; -} - -/* - * Traverse the VRINGH KIOV and issue the APIs to trigger the copies. - * This API is heavily based on the vringh_iov_xfer(..) implementation - * in vringh.c. The reason we cannot reuse vringh_iov_pull_kern(..) - * and vringh_iov_push_kern(..) directly is because there is no - * way to override the VRINGH xfer(..) routines as of v3.10. - */ -static int mic_vringh_copy(struct mic_vdev *mvdev, struct vringh_kiov *iov, - void __user *ubuf, size_t len, bool read, int vr_idx, - size_t *out_len) -{ - int ret = 0; - size_t partlen, tot_len = 0; - - while (len && iov->i < iov->used) { - partlen = min(iov->iov[iov->i].iov_len, len); - if (read) - ret = mic_virtio_copy_to_user(mvdev, ubuf, partlen, - (u64)iov->iov[iov->i].iov_base, - iov->iov[iov->i].iov_len, - vr_idx); - else - ret = mic_virtio_copy_from_user(mvdev, ubuf, partlen, - (u64)iov->iov[iov->i].iov_base, - iov->iov[iov->i].iov_len, - vr_idx); - if (ret) { - dev_err(mic_dev(mvdev), "%s %d err %d\n", - __func__, __LINE__, ret); - break; - } - len -= partlen; - ubuf += partlen; - tot_len += partlen; - iov->consumed += partlen; - iov->iov[iov->i].iov_len -= partlen; - iov->iov[iov->i].iov_base += partlen; - if (!iov->iov[iov->i].iov_len) { - /* Fix up old iov element then increment. */ - iov->iov[iov->i].iov_len = iov->consumed; - iov->iov[iov->i].iov_base -= iov->consumed; - - iov->consumed = 0; - iov->i++; - } - } - *out_len = tot_len; - return ret; -} - -/* - * Use the standard VRINGH infrastructure in the kernel to fetch new - * descriptors, initiate the copies and update the used ring. - */ -static int _mic_virtio_copy(struct mic_vdev *mvdev, - struct mic_copy_desc *copy) -{ - int ret = 0; - u32 iovcnt = copy->iovcnt; - struct iovec iov; - struct iovec __user *u_iov = copy->iov; - void __user *ubuf = NULL; - struct mic_vringh *mvr = &mvdev->mvr[copy->vr_idx]; - struct vringh_kiov *riov = &mvr->riov; - struct vringh_kiov *wiov = &mvr->wiov; - struct vringh *vrh = &mvr->vrh; - u16 *head = &mvr->head; - struct mic_vring *vr = &mvr->vring; - size_t len = 0, out_len; - - copy->out_len = 0; - /* Fetch a new IOVEC if all previous elements have been processed */ - if (riov->i == riov->used && wiov->i == wiov->used) { - ret = vringh_getdesc_kern(vrh, riov, wiov, - head, GFP_KERNEL); - /* Check if there are available descriptors */ - if (ret <= 0) - return ret; - } - while (iovcnt) { - if (!len) { - /* Copy over a new iovec from user space. */ - ret = copy_from_user(&iov, u_iov, sizeof(*u_iov)); - if (ret) { - ret = -EINVAL; - dev_err(mic_dev(mvdev), "%s %d err %d\n", - __func__, __LINE__, ret); - break; - } - len = iov.iov_len; - ubuf = iov.iov_base; - } - /* Issue all the read descriptors first */ - ret = mic_vringh_copy(mvdev, riov, ubuf, len, MIC_VRINGH_READ, - copy->vr_idx, &out_len); - if (ret) { - dev_err(mic_dev(mvdev), "%s %d err %d\n", - __func__, __LINE__, ret); - break; - } - len -= out_len; - ubuf += out_len; - copy->out_len += out_len; - /* Issue the write descriptors next */ - ret = mic_vringh_copy(mvdev, wiov, ubuf, len, !MIC_VRINGH_READ, - copy->vr_idx, &out_len); - if (ret) { - dev_err(mic_dev(mvdev), "%s %d err %d\n", - __func__, __LINE__, ret); - break; - } - len -= out_len; - ubuf += out_len; - copy->out_len += out_len; - if (!len) { - /* One user space iovec is now completed */ - iovcnt--; - u_iov++; - } - /* Exit loop if all elements in KIOVs have been processed. */ - if (riov->i == riov->used && wiov->i == wiov->used) - break; - } - /* - * Update the used ring if a descriptor was available and some data was - * copied in/out and the user asked for a used ring update. - */ - if (*head != USHRT_MAX && copy->out_len && copy->update_used) { - u32 total = 0; - - /* Determine the total data consumed */ - total += mic_vringh_iov_consumed(riov); - total += mic_vringh_iov_consumed(wiov); - vringh_complete_kern(vrh, *head, total); - *head = USHRT_MAX; - if (vringh_need_notify_kern(vrh) > 0) - vringh_notify(vrh); - vringh_kiov_cleanup(riov); - vringh_kiov_cleanup(wiov); - /* Update avail idx for user space */ - vr->info->avail_idx = vrh->last_avail_idx; - } - return ret; -} - -static inline int mic_verify_copy_args(struct mic_vdev *mvdev, - struct mic_copy_desc *copy) -{ - if (copy->vr_idx >= mvdev->dd->num_vq) { - dev_err(mic_dev(mvdev), "%s %d err %d\n", - __func__, __LINE__, -EINVAL); - return -EINVAL; - } - return 0; -} - -/* Copy a specified number of virtio descriptors in a chain */ -int mic_virtio_copy_desc(struct mic_vdev *mvdev, - struct mic_copy_desc *copy) -{ - int err; - struct mic_vringh *mvr = &mvdev->mvr[copy->vr_idx]; - - err = mic_verify_copy_args(mvdev, copy); - if (err) - return err; - - mutex_lock(&mvr->vr_mutex); - if (!mic_vdevup(mvdev)) { - err = -ENODEV; - dev_err(mic_dev(mvdev), "%s %d err %d\n", - __func__, __LINE__, err); - goto err; - } - err = _mic_virtio_copy(mvdev, copy); - if (err) { - dev_err(mic_dev(mvdev), "%s %d err %d\n", - __func__, __LINE__, err); - } -err: - mutex_unlock(&mvr->vr_mutex); - return err; -} - -static void mic_virtio_init_post(struct mic_vdev *mvdev) -{ - struct mic_vqconfig *vqconfig = mic_vq_config(mvdev->dd); - int i; - - for (i = 0; i < mvdev->dd->num_vq; i++) { - if (!le64_to_cpu(vqconfig[i].used_address)) { - dev_warn(mic_dev(mvdev), "used_address zero??\n"); - continue; - } - mvdev->mvr[i].vrh.vring.used = - (void __force *)mvdev->mdev->aper.va + - le64_to_cpu(vqconfig[i].used_address); - } - - mvdev->dc->used_address_updated = 0; - - dev_dbg(mic_dev(mvdev), "%s: device type %d LINKUP\n", - __func__, mvdev->virtio_id); -} - -static inline void mic_virtio_device_reset(struct mic_vdev *mvdev) -{ - int i; - - dev_dbg(mic_dev(mvdev), "%s: status %d device type %d RESET\n", - __func__, mvdev->dd->status, mvdev->virtio_id); - - for (i = 0; i < mvdev->dd->num_vq; i++) - /* - * Avoid lockdep false positive. The + 1 is for the mic - * mutex which is held in the reset devices code path. - */ - mutex_lock_nested(&mvdev->mvr[i].vr_mutex, i + 1); - - /* 0 status means "reset" */ - mvdev->dd->status = 0; - mvdev->dc->vdev_reset = 0; - mvdev->dc->host_ack = 1; - - for (i = 0; i < mvdev->dd->num_vq; i++) { - struct vringh *vrh = &mvdev->mvr[i].vrh; - mvdev->mvr[i].vring.info->avail_idx = 0; - vrh->completed = 0; - vrh->last_avail_idx = 0; - vrh->last_used_idx = 0; - } - - for (i = 0; i < mvdev->dd->num_vq; i++) - mutex_unlock(&mvdev->mvr[i].vr_mutex); -} - -void mic_virtio_reset_devices(struct mic_device *mdev) -{ - struct list_head *pos, *tmp; - struct mic_vdev *mvdev; - - dev_dbg(&mdev->pdev->dev, "%s\n", __func__); - - list_for_each_safe(pos, tmp, &mdev->vdev_list) { - mvdev = list_entry(pos, struct mic_vdev, list); - mic_virtio_device_reset(mvdev); - mvdev->poll_wake = 1; - wake_up(&mvdev->waitq); - } -} - -void mic_bh_handler(struct work_struct *work) -{ - struct mic_vdev *mvdev = container_of(work, struct mic_vdev, - virtio_bh_work); - - if (mvdev->dc->used_address_updated) - mic_virtio_init_post(mvdev); - - if (mvdev->dc->vdev_reset) - mic_virtio_device_reset(mvdev); - - mvdev->poll_wake = 1; - wake_up(&mvdev->waitq); -} - -static irqreturn_t mic_virtio_intr_handler(int irq, void *data) -{ - struct mic_vdev *mvdev = data; - struct mic_device *mdev = mvdev->mdev; - - mdev->ops->intr_workarounds(mdev); - schedule_work(&mvdev->virtio_bh_work); - return IRQ_HANDLED; -} - -int mic_virtio_config_change(struct mic_vdev *mvdev, - void __user *argp) -{ - DECLARE_WAIT_QUEUE_HEAD_ONSTACK(wake); - int ret = 0, retry, i; - struct mic_bootparam *bootparam = mvdev->mdev->dp; - s8 db = bootparam->h2c_config_db; - - mutex_lock(&mvdev->mdev->mic_mutex); - for (i = 0; i < mvdev->dd->num_vq; i++) - mutex_lock_nested(&mvdev->mvr[i].vr_mutex, i + 1); - - if (db == -1 || mvdev->dd->type == -1) { - ret = -EIO; - goto exit; - } - - if (copy_from_user(mic_vq_configspace(mvdev->dd), - argp, mvdev->dd->config_len)) { - dev_err(mic_dev(mvdev), "%s %d err %d\n", - __func__, __LINE__, -EFAULT); - ret = -EFAULT; - goto exit; - } - mvdev->dc->config_change = MIC_VIRTIO_PARAM_CONFIG_CHANGED; - mvdev->mdev->ops->send_intr(mvdev->mdev, db); - - for (retry = 100; retry--;) { - ret = wait_event_timeout(wake, - mvdev->dc->guest_ack, msecs_to_jiffies(100)); - if (ret) - break; - } - - dev_dbg(mic_dev(mvdev), - "%s %d retry: %d\n", __func__, __LINE__, retry); - mvdev->dc->config_change = 0; - mvdev->dc->guest_ack = 0; -exit: - for (i = 0; i < mvdev->dd->num_vq; i++) - mutex_unlock(&mvdev->mvr[i].vr_mutex); - mutex_unlock(&mvdev->mdev->mic_mutex); - return ret; -} - -static int mic_copy_dp_entry(struct mic_vdev *mvdev, - void __user *argp, - __u8 *type, - struct mic_device_desc **devpage) -{ - struct mic_device *mdev = mvdev->mdev; - struct mic_device_desc dd, *dd_config, *devp; - struct mic_vqconfig *vqconfig; - int ret = 0, i; - bool slot_found = false; - - if (copy_from_user(&dd, argp, sizeof(dd))) { - dev_err(mic_dev(mvdev), "%s %d err %d\n", - __func__, __LINE__, -EFAULT); - return -EFAULT; - } - - if (mic_aligned_desc_size(&dd) > MIC_MAX_DESC_BLK_SIZE || - dd.num_vq > MIC_MAX_VRINGS) { - dev_err(mic_dev(mvdev), "%s %d err %d\n", - __func__, __LINE__, -EINVAL); - return -EINVAL; - } - - dd_config = kmalloc(mic_desc_size(&dd), GFP_KERNEL); - if (dd_config == NULL) { - dev_err(mic_dev(mvdev), "%s %d err %d\n", - __func__, __LINE__, -ENOMEM); - return -ENOMEM; - } - if (copy_from_user(dd_config, argp, mic_desc_size(&dd))) { - ret = -EFAULT; - dev_err(mic_dev(mvdev), "%s %d err %d\n", - __func__, __LINE__, ret); - goto exit; - } - - vqconfig = mic_vq_config(dd_config); - for (i = 0; i < dd.num_vq; i++) { - if (le16_to_cpu(vqconfig[i].num) > MIC_MAX_VRING_ENTRIES) { - ret = -EINVAL; - dev_err(mic_dev(mvdev), "%s %d err %d\n", - __func__, __LINE__, ret); - goto exit; - } - } - - /* Find the first free device page entry */ - for (i = sizeof(struct mic_bootparam); - i < MIC_DP_SIZE - mic_total_desc_size(dd_config); - i += mic_total_desc_size(devp)) { - devp = mdev->dp + i; - if (devp->type == 0 || devp->type == -1) { - slot_found = true; - break; - } - } - if (!slot_found) { - ret = -EINVAL; - dev_err(mic_dev(mvdev), "%s %d err %d\n", - __func__, __LINE__, ret); - goto exit; - } - /* - * Save off the type before doing the memcpy. Type will be set in the - * end after completing all initialization for the new device. - */ - *type = dd_config->type; - dd_config->type = 0; - memcpy(devp, dd_config, mic_desc_size(dd_config)); - - *devpage = devp; -exit: - kfree(dd_config); - return ret; -} - -static void mic_init_device_ctrl(struct mic_vdev *mvdev, - struct mic_device_desc *devpage) -{ - struct mic_device_ctrl *dc; - - dc = (void *)devpage + mic_aligned_desc_size(devpage); - - dc->config_change = 0; - 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; - mvdev->dc = dc; -} - -int mic_virtio_add_device(struct mic_vdev *mvdev, - void __user *argp) -{ - struct mic_device *mdev = mvdev->mdev; - struct mic_device_desc *dd = NULL; - struct mic_vqconfig *vqconfig; - int vr_size, i, j, ret; - u8 type = 0; - s8 db; - char irqname[10]; - struct mic_bootparam *bootparam = mdev->dp; - u16 num; - dma_addr_t vr_addr; - - mutex_lock(&mdev->mic_mutex); - - ret = mic_copy_dp_entry(mvdev, argp, &type, &dd); - if (ret) { - mutex_unlock(&mdev->mic_mutex); - return ret; - } - - mic_init_device_ctrl(mvdev, dd); - - mvdev->dd = dd; - mvdev->virtio_id = type; - vqconfig = mic_vq_config(dd); - INIT_WORK(&mvdev->virtio_bh_work, mic_bh_handler); - - for (i = 0; i < dd->num_vq; i++) { - struct mic_vringh *mvr = &mvdev->mvr[i]; - struct mic_vring *vr = &mvdev->mvr[i].vring; - num = le16_to_cpu(vqconfig[i].num); - mutex_init(&mvr->vr_mutex); - vr_size = PAGE_ALIGN(vring_size(num, MIC_VIRTIO_RING_ALIGN) + - sizeof(struct _mic_vring_info)); - vr->va = (void *) - __get_free_pages(GFP_KERNEL | __GFP_ZERO, - get_order(vr_size)); - if (!vr->va) { - ret = -ENOMEM; - dev_err(mic_dev(mvdev), "%s %d err %d\n", - __func__, __LINE__, ret); - goto err; - } - vr->len = vr_size; - vr->info = vr->va + vring_size(num, MIC_VIRTIO_RING_ALIGN); - vr->info->magic = cpu_to_le32(MIC_MAGIC + mvdev->virtio_id + i); - vr_addr = mic_map_single(mdev, vr->va, vr_size); - if (mic_map_error(vr_addr)) { - free_pages((unsigned long)vr->va, get_order(vr_size)); - ret = -ENOMEM; - dev_err(mic_dev(mvdev), "%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); - ret = vringh_init_kern(&mvr->vrh, - *(u32 *)mic_vq_features(mvdev->dd), num, false, - vr->vr.desc, vr->vr.avail, vr->vr.used); - if (ret) { - dev_err(mic_dev(mvdev), "%s %d err %d\n", - __func__, __LINE__, ret); - goto err; - } - vringh_kiov_init(&mvr->riov, NULL, 0); - vringh_kiov_init(&mvr->wiov, NULL, 0); - mvr->head = USHRT_MAX; - mvr->mvdev = mvdev; - mvr->vrh.notify = mic_notify; - dev_dbg(&mdev->pdev->dev, - "%s %d index %d va %p info %p vr_size 0x%x\n", - __func__, __LINE__, i, vr->va, vr->info, vr_size); - mvr->buf = (void *)__get_free_pages(GFP_KERNEL, - get_order(MIC_INT_DMA_BUF_SIZE)); - mvr->buf_da = mic_map_single(mvdev->mdev, mvr->buf, - MIC_INT_DMA_BUF_SIZE); - } - - snprintf(irqname, sizeof(irqname), "mic%dvirtio%d", mdev->id, - mvdev->virtio_id); - mvdev->virtio_db = mic_next_db(mdev); - mvdev->virtio_cookie = mic_request_threaded_irq(mdev, - mic_virtio_intr_handler, - NULL, irqname, mvdev, - mvdev->virtio_db, MIC_INTR_DB); - if (IS_ERR(mvdev->virtio_cookie)) { - ret = PTR_ERR(mvdev->virtio_cookie); - dev_dbg(&mdev->pdev->dev, "request irq failed\n"); - goto err; - } - - mvdev->dc->c2h_vdev_db = mvdev->virtio_db; - - list_add_tail(&mvdev->list, &mdev->vdev_list); - /* - * Order the type update with previous stores. This write barrier - * is paired with the corresponding read barrier before the uncached - * system memory read of the type, on the card while scanning the - * device page. - */ - smp_wmb(); - dd->type = type; - - dev_dbg(&mdev->pdev->dev, "Added virtio device id %d\n", dd->type); - - db = bootparam->h2c_config_db; - if (db != -1) - mdev->ops->send_intr(mdev, db); - mutex_unlock(&mdev->mic_mutex); - return 0; -err: - vqconfig = mic_vq_config(dd); - for (j = 0; j < i; j++) { - struct mic_vringh *mvr = &mvdev->mvr[j]; - mic_unmap_single(mdev, le64_to_cpu(vqconfig[j].address), - mvr->vring.len); - free_pages((unsigned long)mvr->vring.va, - get_order(mvr->vring.len)); - } - mutex_unlock(&mdev->mic_mutex); - return ret; -} - -void mic_virtio_del_device(struct mic_vdev *mvdev) -{ - struct list_head *pos, *tmp; - struct mic_vdev *tmp_mvdev; - struct mic_device *mdev = mvdev->mdev; - DECLARE_WAIT_QUEUE_HEAD_ONSTACK(wake); - int i, ret, retry; - struct mic_vqconfig *vqconfig; - struct mic_bootparam *bootparam = mdev->dp; - s8 db; - - mutex_lock(&mdev->mic_mutex); - db = bootparam->h2c_config_db; - if (db == -1) - goto skip_hot_remove; - dev_dbg(&mdev->pdev->dev, - "Requesting hot remove id %d\n", mvdev->virtio_id); - mvdev->dc->config_change = MIC_VIRTIO_PARAM_DEV_REMOVE; - mdev->ops->send_intr(mdev, db); - for (retry = 100; retry--;) { - ret = wait_event_timeout(wake, - mvdev->dc->guest_ack, msecs_to_jiffies(100)); - if (ret) - break; - } - dev_dbg(&mdev->pdev->dev, - "Device id %d config_change %d guest_ack %d retry %d\n", - mvdev->virtio_id, mvdev->dc->config_change, - mvdev->dc->guest_ack, retry); - mvdev->dc->config_change = 0; - mvdev->dc->guest_ack = 0; -skip_hot_remove: - mic_free_irq(mdev, mvdev->virtio_cookie, mvdev); - flush_work(&mvdev->virtio_bh_work); - vqconfig = mic_vq_config(mvdev->dd); - for (i = 0; i < mvdev->dd->num_vq; i++) { - struct mic_vringh *mvr = &mvdev->mvr[i]; - - mic_unmap_single(mvdev->mdev, mvr->buf_da, - MIC_INT_DMA_BUF_SIZE); - free_pages((unsigned long)mvr->buf, - get_order(MIC_INT_DMA_BUF_SIZE)); - vringh_kiov_cleanup(&mvr->riov); - vringh_kiov_cleanup(&mvr->wiov); - mic_unmap_single(mdev, le64_to_cpu(vqconfig[i].address), - mvr->vring.len); - free_pages((unsigned long)mvr->vring.va, - get_order(mvr->vring.len)); - } - - list_for_each_safe(pos, tmp, &mdev->vdev_list) { - tmp_mvdev = list_entry(pos, struct mic_vdev, list); - if (tmp_mvdev == mvdev) { - list_del(pos); - dev_dbg(&mdev->pdev->dev, - "Removing virtio device id %d\n", - mvdev->virtio_id); - break; - } - } - /* - * Order the type update with previous stores. This write barrier - * is paired with the corresponding read barrier before the uncached - * system memory read of the type, on the card while scanning the - * device page. - */ - smp_wmb(); - mvdev->dd->type = -1; - mutex_unlock(&mdev->mic_mutex); -} |