d4ef098e4c
This patch adds a dma device on the mic virtual bus and uses this dmaengine to transfer data for virtio devices Reviewed-by: Nikhil Rao <nikhil.rao@intel.com> Signed-off-by: Sudeep Dutt <sudeep.dutt@intel.com> Signed-off-by: Ashutosh Dixit <ashutosh.dixit@intel.com> Signed-off-by: Siva Yerramreddy <yshivakrishna@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
155 lines
5.1 KiB
C
155 lines
5.1 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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#ifndef MIC_VIRTIO_H
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#define MIC_VIRTIO_H
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#include <linux/virtio_config.h>
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#include <linux/mic_ioctl.h>
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/*
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* Note on endianness.
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* 1. Host can be both BE or LE
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* 2. Guest/card is LE. Host uses le_to_cpu to access desc/avail
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* rings and ioreadXX/iowriteXX to access used ring.
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* 3. Device page exposed by host to guest contains LE values. Guest
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* accesses these using ioreadXX/iowriteXX etc. This way in general we
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* obey the virtio spec according to which guest works with native
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* endianness and host is aware of guest endianness and does all
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* required endianness conversion.
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* 4. Data provided from user space to guest (in ADD_DEVICE and
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* CONFIG_CHANGE ioctl's) is not interpreted by the driver and should be
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* in guest endianness.
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*/
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/**
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* struct mic_vringh - Virtio ring host information.
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*
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* @vring: The MIC vring used for setting up user space mappings.
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* @vrh: The host VRINGH used for accessing the card vrings.
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* @riov: The VRINGH read kernel IOV.
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* @wiov: The VRINGH write kernel IOV.
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* @vr_mutex: Mutex for synchronizing access to the VRING.
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* @buf: Temporary kernel buffer used to copy in/out data
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* from/to the card via DMA.
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* @buf_da: dma address of buf.
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* @mvdev: Back pointer to MIC virtio device for vringh_notify(..).
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* @head: The VRINGH head index address passed to vringh_getdesc_kern(..).
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*/
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struct mic_vringh {
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struct mic_vring vring;
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struct vringh vrh;
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struct vringh_kiov riov;
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struct vringh_kiov wiov;
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struct mutex vr_mutex;
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void *buf;
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dma_addr_t buf_da;
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struct mic_vdev *mvdev;
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u16 head;
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};
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/**
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* struct mic_vdev - Host information for a card Virtio device.
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*
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* @virtio_id - Virtio device id.
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* @waitq - Waitqueue to allow ring3 apps to poll.
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* @mdev - Back pointer to host MIC device.
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* @poll_wake - Used for waking up threads blocked in poll.
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* @out_bytes - Debug stats for number of bytes copied from host to card.
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* @in_bytes - Debug stats for number of bytes copied from card to host.
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* @out_bytes_dma - Debug stats for number of bytes copied from host to card
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* using DMA.
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* @in_bytes_dma - Debug stats for number of bytes copied from card to host
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* using DMA.
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* @tx_len_unaligned - Debug stats for number of bytes copied to the card where
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* the transfer length did not have the required DMA alignment.
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* @tx_dst_unaligned - Debug stats for number of bytes copied where the
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* destination address on the card did not have the required DMA alignment.
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* @mvr - Store per VRING data structures.
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* @virtio_bh_work - Work struct used to schedule virtio bottom half handling.
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* @dd - Virtio device descriptor.
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* @dc - Virtio device control fields.
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* @list - List of Virtio devices.
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* @virtio_db - The doorbell used by the card to interrupt the host.
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* @virtio_cookie - The cookie returned while requesting interrupts.
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*/
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struct mic_vdev {
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int virtio_id;
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wait_queue_head_t waitq;
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struct mic_device *mdev;
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int poll_wake;
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unsigned long out_bytes;
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unsigned long in_bytes;
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unsigned long out_bytes_dma;
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unsigned long in_bytes_dma;
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unsigned long tx_len_unaligned;
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unsigned long tx_dst_unaligned;
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struct mic_vringh mvr[MIC_MAX_VRINGS];
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struct work_struct virtio_bh_work;
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struct mic_device_desc *dd;
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struct mic_device_ctrl *dc;
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struct list_head list;
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int virtio_db;
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struct mic_irq *virtio_cookie;
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};
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void mic_virtio_uninit(struct mic_device *mdev);
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int mic_virtio_add_device(struct mic_vdev *mvdev,
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void __user *argp);
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void mic_virtio_del_device(struct mic_vdev *mvdev);
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int mic_virtio_config_change(struct mic_vdev *mvdev,
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void __user *argp);
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int mic_virtio_copy_desc(struct mic_vdev *mvdev,
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struct mic_copy_desc *request);
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void mic_virtio_reset_devices(struct mic_device *mdev);
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void mic_bh_handler(struct work_struct *work);
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/* Helper API to obtain the MIC PCIe device */
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static inline struct device *mic_dev(struct mic_vdev *mvdev)
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{
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return mvdev->mdev->sdev->parent;
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}
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/* Helper API to check if a virtio device is initialized */
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static inline int mic_vdev_inited(struct mic_vdev *mvdev)
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{
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/* Device has not been created yet */
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if (!mvdev->dd || !mvdev->dd->type) {
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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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/* Device has been removed/deleted */
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if (mvdev->dd->type == -1) {
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dev_err(mic_dev(mvdev), "%s %d err %d\n",
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__func__, __LINE__, -ENODEV);
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return -ENODEV;
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}
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return 0;
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}
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/* Helper API to check if a virtio device is running */
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static inline bool mic_vdevup(struct mic_vdev *mvdev)
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{
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return !!mvdev->dd->status;
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}
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#endif
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