mirror of https://gitee.com/openkylin/linux.git
812 lines
21 KiB
C
812 lines
21 KiB
C
/*
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* Intel MIC Platform Software Stack (MPSS)
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*
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* Copyright(c) 2013 Intel Corporation.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License, version 2, as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* The full GNU General Public License is included in this distribution in
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* the file called "COPYING".
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*
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* Intel MIC Host driver.
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*
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*/
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#include <linux/pci.h>
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#include <linux/sched.h>
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#include <linux/uaccess.h>
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#include <linux/dmaengine.h>
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#include <linux/mic_common.h>
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#include "../common/mic_dev.h"
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#include "mic_device.h"
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#include "mic_smpt.h"
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#include "mic_virtio.h"
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/*
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* Size of the internal buffer used during DMA's as an intermediate buffer
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* for copy to/from user.
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*/
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#define MIC_INT_DMA_BUF_SIZE PAGE_ALIGN(64 * 1024ULL)
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static int mic_sync_dma(struct mic_device *mdev, dma_addr_t dst,
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dma_addr_t src, size_t len)
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{
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int err = 0;
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struct dma_async_tx_descriptor *tx;
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struct dma_chan *mic_ch = mdev->dma_ch[0];
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if (!mic_ch) {
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err = -EBUSY;
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goto error;
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}
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tx = mic_ch->device->device_prep_dma_memcpy(mic_ch, dst, src, len,
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DMA_PREP_FENCE);
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if (!tx) {
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err = -ENOMEM;
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goto error;
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} else {
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dma_cookie_t cookie = tx->tx_submit(tx);
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err = dma_submit_error(cookie);
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if (err)
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goto error;
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err = dma_sync_wait(mic_ch, cookie);
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}
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error:
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if (err)
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dev_err(&mdev->pdev->dev, "%s %d err %d\n",
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__func__, __LINE__, err);
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return err;
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}
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/*
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* Initiates the copies across the PCIe bus from card memory to a user
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* space buffer. When transfers are done using DMA, source/destination
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* addresses and transfer length must follow the alignment requirements of
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* the MIC DMA engine.
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*/
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static int mic_virtio_copy_to_user(struct mic_vdev *mvdev, void __user *ubuf,
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size_t len, u64 daddr, size_t dlen,
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int vr_idx)
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{
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struct mic_device *mdev = mvdev->mdev;
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void __iomem *dbuf = mdev->aper.va + daddr;
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struct mic_vringh *mvr = &mvdev->mvr[vr_idx];
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size_t dma_alignment = 1 << mdev->dma_ch[0]->device->copy_align;
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size_t dma_offset;
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size_t partlen;
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int err;
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dma_offset = daddr - round_down(daddr, dma_alignment);
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daddr -= dma_offset;
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len += dma_offset;
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while (len) {
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partlen = min_t(size_t, len, MIC_INT_DMA_BUF_SIZE);
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err = mic_sync_dma(mdev, mvr->buf_da, daddr,
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ALIGN(partlen, dma_alignment));
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if (err)
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goto err;
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if (copy_to_user(ubuf, mvr->buf + dma_offset,
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partlen - dma_offset)) {
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err = -EFAULT;
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goto err;
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}
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daddr += partlen;
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ubuf += partlen;
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dbuf += partlen;
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mvdev->in_bytes_dma += partlen;
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mvdev->in_bytes += partlen;
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len -= partlen;
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dma_offset = 0;
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}
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return 0;
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err:
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dev_err(mic_dev(mvdev), "%s %d err %d\n", __func__, __LINE__, err);
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return err;
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}
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/*
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* Initiates copies across the PCIe bus from a user space buffer to card
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* memory. When transfers are done using DMA, source/destination addresses
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* and transfer length must follow the alignment requirements of the MIC
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* DMA engine.
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*/
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static int mic_virtio_copy_from_user(struct mic_vdev *mvdev, void __user *ubuf,
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size_t len, u64 daddr, size_t dlen,
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int vr_idx)
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{
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struct mic_device *mdev = mvdev->mdev;
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void __iomem *dbuf = mdev->aper.va + daddr;
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struct mic_vringh *mvr = &mvdev->mvr[vr_idx];
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size_t dma_alignment = 1 << mdev->dma_ch[0]->device->copy_align;
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size_t partlen;
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int err;
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if (daddr & (dma_alignment - 1)) {
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mvdev->tx_dst_unaligned += len;
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goto memcpy;
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} else if (ALIGN(len, dma_alignment) > dlen) {
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mvdev->tx_len_unaligned += len;
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goto memcpy;
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}
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while (len) {
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partlen = min_t(size_t, len, MIC_INT_DMA_BUF_SIZE);
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if (copy_from_user(mvr->buf, ubuf, partlen)) {
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err = -EFAULT;
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goto err;
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}
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err = mic_sync_dma(mdev, daddr, mvr->buf_da,
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ALIGN(partlen, dma_alignment));
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if (err)
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goto err;
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daddr += partlen;
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ubuf += partlen;
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dbuf += partlen;
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mvdev->out_bytes_dma += partlen;
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mvdev->out_bytes += partlen;
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len -= partlen;
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}
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memcpy:
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/*
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* We are copying to IO below and should ideally use something
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* like copy_from_user_toio(..) if it existed.
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*/
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if (copy_from_user((void __force *)dbuf, ubuf, len)) {
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err = -EFAULT;
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goto err;
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}
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mvdev->out_bytes += len;
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return 0;
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err:
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dev_err(mic_dev(mvdev), "%s %d err %d\n", __func__, __LINE__, err);
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return err;
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}
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#define MIC_VRINGH_READ true
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/* The function to call to notify the card about added buffers */
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static void mic_notify(struct vringh *vrh)
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{
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struct mic_vringh *mvrh = container_of(vrh, struct mic_vringh, vrh);
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struct mic_vdev *mvdev = mvrh->mvdev;
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s8 db = mvdev->dc->h2c_vdev_db;
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if (db != -1)
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mvdev->mdev->ops->send_intr(mvdev->mdev, db);
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}
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/* Determine the total number of bytes consumed in a VRINGH KIOV */
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static inline u32 mic_vringh_iov_consumed(struct vringh_kiov *iov)
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{
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int i;
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u32 total = iov->consumed;
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for (i = 0; i < iov->i; i++)
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total += iov->iov[i].iov_len;
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return total;
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}
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/*
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* Traverse the VRINGH KIOV and issue the APIs to trigger the copies.
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* This API is heavily based on the vringh_iov_xfer(..) implementation
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* in vringh.c. The reason we cannot reuse vringh_iov_pull_kern(..)
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* and vringh_iov_push_kern(..) directly is because there is no
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* way to override the VRINGH xfer(..) routines as of v3.10.
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*/
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static int mic_vringh_copy(struct mic_vdev *mvdev, struct vringh_kiov *iov,
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void __user *ubuf, size_t len, bool read, int vr_idx,
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size_t *out_len)
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{
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int ret = 0;
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size_t partlen, tot_len = 0;
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while (len && iov->i < iov->used) {
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partlen = min(iov->iov[iov->i].iov_len, len);
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if (read)
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ret = mic_virtio_copy_to_user(mvdev, ubuf, partlen,
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(u64)iov->iov[iov->i].iov_base,
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iov->iov[iov->i].iov_len,
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vr_idx);
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else
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ret = mic_virtio_copy_from_user(mvdev, ubuf, partlen,
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(u64)iov->iov[iov->i].iov_base,
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iov->iov[iov->i].iov_len,
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vr_idx);
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if (ret) {
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dev_err(mic_dev(mvdev), "%s %d err %d\n",
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__func__, __LINE__, ret);
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break;
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}
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len -= partlen;
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ubuf += partlen;
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tot_len += partlen;
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iov->consumed += partlen;
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iov->iov[iov->i].iov_len -= partlen;
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iov->iov[iov->i].iov_base += partlen;
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if (!iov->iov[iov->i].iov_len) {
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/* Fix up old iov element then increment. */
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iov->iov[iov->i].iov_len = iov->consumed;
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iov->iov[iov->i].iov_base -= iov->consumed;
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iov->consumed = 0;
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iov->i++;
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}
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}
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*out_len = tot_len;
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return ret;
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}
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/*
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* Use the standard VRINGH infrastructure in the kernel to fetch new
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* descriptors, initiate the copies and update the used ring.
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*/
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static int _mic_virtio_copy(struct mic_vdev *mvdev,
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struct mic_copy_desc *copy)
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{
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int ret = 0;
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u32 iovcnt = copy->iovcnt;
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struct iovec iov;
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struct iovec __user *u_iov = copy->iov;
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void __user *ubuf = NULL;
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struct mic_vringh *mvr = &mvdev->mvr[copy->vr_idx];
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struct vringh_kiov *riov = &mvr->riov;
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struct vringh_kiov *wiov = &mvr->wiov;
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struct vringh *vrh = &mvr->vrh;
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u16 *head = &mvr->head;
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struct mic_vring *vr = &mvr->vring;
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size_t len = 0, out_len;
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copy->out_len = 0;
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/* Fetch a new IOVEC if all previous elements have been processed */
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if (riov->i == riov->used && wiov->i == wiov->used) {
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ret = vringh_getdesc_kern(vrh, riov, wiov,
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head, GFP_KERNEL);
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/* Check if there are available descriptors */
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if (ret <= 0)
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return ret;
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}
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while (iovcnt) {
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if (!len) {
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/* Copy over a new iovec from user space. */
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ret = copy_from_user(&iov, u_iov, sizeof(*u_iov));
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if (ret) {
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ret = -EINVAL;
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dev_err(mic_dev(mvdev), "%s %d err %d\n",
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__func__, __LINE__, ret);
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break;
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}
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len = iov.iov_len;
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ubuf = iov.iov_base;
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}
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/* Issue all the read descriptors first */
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ret = mic_vringh_copy(mvdev, riov, ubuf, len, MIC_VRINGH_READ,
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copy->vr_idx, &out_len);
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if (ret) {
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dev_err(mic_dev(mvdev), "%s %d err %d\n",
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__func__, __LINE__, ret);
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break;
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}
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len -= out_len;
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ubuf += out_len;
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copy->out_len += out_len;
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/* Issue the write descriptors next */
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ret = mic_vringh_copy(mvdev, wiov, ubuf, len, !MIC_VRINGH_READ,
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copy->vr_idx, &out_len);
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if (ret) {
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dev_err(mic_dev(mvdev), "%s %d err %d\n",
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__func__, __LINE__, ret);
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break;
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}
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len -= out_len;
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ubuf += out_len;
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copy->out_len += out_len;
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if (!len) {
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/* One user space iovec is now completed */
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iovcnt--;
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u_iov++;
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}
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/* Exit loop if all elements in KIOVs have been processed. */
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if (riov->i == riov->used && wiov->i == wiov->used)
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break;
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}
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/*
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* Update the used ring if a descriptor was available and some data was
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* copied in/out and the user asked for a used ring update.
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*/
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if (*head != USHRT_MAX && copy->out_len && copy->update_used) {
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u32 total = 0;
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/* Determine the total data consumed */
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total += mic_vringh_iov_consumed(riov);
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total += mic_vringh_iov_consumed(wiov);
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vringh_complete_kern(vrh, *head, total);
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*head = USHRT_MAX;
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if (vringh_need_notify_kern(vrh) > 0)
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vringh_notify(vrh);
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vringh_kiov_cleanup(riov);
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vringh_kiov_cleanup(wiov);
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/* Update avail idx for user space */
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vr->info->avail_idx = vrh->last_avail_idx;
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}
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return ret;
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}
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static inline int mic_verify_copy_args(struct mic_vdev *mvdev,
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struct mic_copy_desc *copy)
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{
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if (copy->vr_idx >= mvdev->dd->num_vq) {
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dev_err(mic_dev(mvdev), "%s %d err %d\n",
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__func__, __LINE__, -EINVAL);
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return -EINVAL;
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}
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return 0;
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}
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/* Copy a specified number of virtio descriptors in a chain */
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int mic_virtio_copy_desc(struct mic_vdev *mvdev,
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struct mic_copy_desc *copy)
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{
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int err;
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struct mic_vringh *mvr = &mvdev->mvr[copy->vr_idx];
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err = mic_verify_copy_args(mvdev, copy);
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if (err)
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return err;
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mutex_lock(&mvr->vr_mutex);
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if (!mic_vdevup(mvdev)) {
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err = -ENODEV;
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dev_err(mic_dev(mvdev), "%s %d err %d\n",
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__func__, __LINE__, err);
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goto err;
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}
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err = _mic_virtio_copy(mvdev, copy);
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if (err) {
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dev_err(mic_dev(mvdev), "%s %d err %d\n",
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__func__, __LINE__, err);
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}
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err:
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mutex_unlock(&mvr->vr_mutex);
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return err;
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}
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static void mic_virtio_init_post(struct mic_vdev *mvdev)
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{
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struct mic_vqconfig *vqconfig = mic_vq_config(mvdev->dd);
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int i;
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for (i = 0; i < mvdev->dd->num_vq; i++) {
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if (!le64_to_cpu(vqconfig[i].used_address)) {
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dev_warn(mic_dev(mvdev), "used_address zero??\n");
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continue;
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}
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mvdev->mvr[i].vrh.vring.used =
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(void __force *)mvdev->mdev->aper.va +
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le64_to_cpu(vqconfig[i].used_address);
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}
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mvdev->dc->used_address_updated = 0;
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dev_dbg(mic_dev(mvdev), "%s: device type %d LINKUP\n",
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__func__, mvdev->virtio_id);
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}
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static inline void mic_virtio_device_reset(struct mic_vdev *mvdev)
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{
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int i;
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dev_dbg(mic_dev(mvdev), "%s: status %d device type %d RESET\n",
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__func__, mvdev->dd->status, mvdev->virtio_id);
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for (i = 0; i < mvdev->dd->num_vq; i++)
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/*
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* Avoid lockdep false positive. The + 1 is for the mic
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* mutex which is held in the reset devices code path.
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*/
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mutex_lock_nested(&mvdev->mvr[i].vr_mutex, i + 1);
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/* 0 status means "reset" */
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mvdev->dd->status = 0;
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mvdev->dc->vdev_reset = 0;
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mvdev->dc->host_ack = 1;
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for (i = 0; i < mvdev->dd->num_vq; i++) {
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struct vringh *vrh = &mvdev->mvr[i].vrh;
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mvdev->mvr[i].vring.info->avail_idx = 0;
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vrh->completed = 0;
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vrh->last_avail_idx = 0;
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vrh->last_used_idx = 0;
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}
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for (i = 0; i < mvdev->dd->num_vq; i++)
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mutex_unlock(&mvdev->mvr[i].vr_mutex);
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}
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void mic_virtio_reset_devices(struct mic_device *mdev)
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{
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struct list_head *pos, *tmp;
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struct mic_vdev *mvdev;
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dev_dbg(&mdev->pdev->dev, "%s\n", __func__);
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list_for_each_safe(pos, tmp, &mdev->vdev_list) {
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mvdev = list_entry(pos, struct mic_vdev, list);
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mic_virtio_device_reset(mvdev);
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mvdev->poll_wake = 1;
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wake_up(&mvdev->waitq);
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}
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}
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void mic_bh_handler(struct work_struct *work)
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{
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struct mic_vdev *mvdev = container_of(work, struct mic_vdev,
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virtio_bh_work);
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if (mvdev->dc->used_address_updated)
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mic_virtio_init_post(mvdev);
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if (mvdev->dc->vdev_reset)
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mic_virtio_device_reset(mvdev);
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mvdev->poll_wake = 1;
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wake_up(&mvdev->waitq);
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}
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static irqreturn_t mic_virtio_intr_handler(int irq, void *data)
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{
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struct mic_vdev *mvdev = data;
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struct mic_device *mdev = mvdev->mdev;
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mdev->ops->intr_workarounds(mdev);
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schedule_work(&mvdev->virtio_bh_work);
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return IRQ_HANDLED;
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}
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int mic_virtio_config_change(struct mic_vdev *mvdev,
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void __user *argp)
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{
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DECLARE_WAIT_QUEUE_HEAD_ONSTACK(wake);
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int ret = 0, retry, i;
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struct mic_bootparam *bootparam = mvdev->mdev->dp;
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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);
|
|
}
|