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![Pierre-Louis Bossart](/assets/img/avatar_default.png)
make W=1 warning: sound/virtio/virtio_ctl_msg.c:70: warning: expecting prototype for virtsnd_ctl_msg_request(). Prototype was for virtsnd_ctl_msg_response() instead Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com> Link: https://lore.kernel.org/r/20210426213902.234711-1-pierre-louis.bossart@linux.intel.com Signed-off-by: Takashi Iwai <tiwai@suse.de>
310 lines
7.9 KiB
C
310 lines
7.9 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* virtio-snd: Virtio sound device
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* Copyright (C) 2021 OpenSynergy GmbH
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*/
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#include <linux/moduleparam.h>
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#include <linux/virtio_config.h>
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#include "virtio_card.h"
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/**
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* struct virtio_snd_msg - Control message.
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* @sg_request: Scattergather list containing a device request (header).
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* @sg_response: Scattergather list containing a device response (status).
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* @list: Pending message list entry.
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* @notify: Request completed notification.
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* @ref_count: Reference count used to manage a message lifetime.
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*/
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struct virtio_snd_msg {
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struct scatterlist sg_request;
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struct scatterlist sg_response;
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struct list_head list;
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struct completion notify;
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refcount_t ref_count;
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};
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/**
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* virtsnd_ctl_msg_ref() - Increment reference counter for the message.
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* @msg: Control message.
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*
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* Context: Any context.
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*/
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void virtsnd_ctl_msg_ref(struct virtio_snd_msg *msg)
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{
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refcount_inc(&msg->ref_count);
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}
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/**
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* virtsnd_ctl_msg_unref() - Decrement reference counter for the message.
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* @msg: Control message.
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*
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* The message will be freed when the ref_count value is 0.
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*
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* Context: Any context.
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*/
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void virtsnd_ctl_msg_unref(struct virtio_snd_msg *msg)
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{
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if (refcount_dec_and_test(&msg->ref_count))
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kfree(msg);
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}
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/**
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* virtsnd_ctl_msg_request() - Get a pointer to the request header.
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* @msg: Control message.
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*
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* Context: Any context.
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*/
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void *virtsnd_ctl_msg_request(struct virtio_snd_msg *msg)
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{
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return sg_virt(&msg->sg_request);
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}
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/**
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* virtsnd_ctl_msg_response() - Get a pointer to the response header.
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* @msg: Control message.
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*
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* Context: Any context.
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*/
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void *virtsnd_ctl_msg_response(struct virtio_snd_msg *msg)
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{
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return sg_virt(&msg->sg_response);
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}
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/**
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* virtsnd_ctl_msg_alloc() - Allocate and initialize a control message.
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* @request_size: Size of request header.
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* @response_size: Size of response header.
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* @gfp: Kernel flags for memory allocation.
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*
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* The message will be automatically freed when the ref_count value is 0.
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*
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* Context: Any context. May sleep if @gfp flags permit.
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* Return: Allocated message on success, NULL on failure.
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*/
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struct virtio_snd_msg *virtsnd_ctl_msg_alloc(size_t request_size,
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size_t response_size, gfp_t gfp)
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{
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struct virtio_snd_msg *msg;
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if (!request_size || !response_size)
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return NULL;
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msg = kzalloc(sizeof(*msg) + request_size + response_size, gfp);
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if (!msg)
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return NULL;
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sg_init_one(&msg->sg_request, (u8 *)msg + sizeof(*msg), request_size);
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sg_init_one(&msg->sg_response, (u8 *)msg + sizeof(*msg) + request_size,
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response_size);
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INIT_LIST_HEAD(&msg->list);
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init_completion(&msg->notify);
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/* This reference is dropped in virtsnd_ctl_msg_complete(). */
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refcount_set(&msg->ref_count, 1);
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return msg;
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}
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/**
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* virtsnd_ctl_msg_send() - Send a control message.
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* @snd: VirtIO sound device.
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* @msg: Control message.
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* @out_sgs: Additional sg-list to attach to the request header (may be NULL).
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* @in_sgs: Additional sg-list to attach to the response header (may be NULL).
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* @nowait: Flag indicating whether to wait for completion.
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*
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* Context: Any context. Takes and releases the control queue spinlock.
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* May sleep if @nowait is false.
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* Return: 0 on success, -errno on failure.
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*/
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int virtsnd_ctl_msg_send(struct virtio_snd *snd, struct virtio_snd_msg *msg,
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struct scatterlist *out_sgs,
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struct scatterlist *in_sgs, bool nowait)
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{
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struct virtio_device *vdev = snd->vdev;
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struct virtio_snd_queue *queue = virtsnd_control_queue(snd);
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unsigned int js = msecs_to_jiffies(virtsnd_msg_timeout_ms);
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struct virtio_snd_hdr *request = virtsnd_ctl_msg_request(msg);
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struct virtio_snd_hdr *response = virtsnd_ctl_msg_response(msg);
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unsigned int nouts = 0;
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unsigned int nins = 0;
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struct scatterlist *psgs[4];
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bool notify = false;
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unsigned long flags;
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int rc;
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virtsnd_ctl_msg_ref(msg);
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/* Set the default status in case the message was canceled. */
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response->code = cpu_to_le32(VIRTIO_SND_S_IO_ERR);
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psgs[nouts++] = &msg->sg_request;
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if (out_sgs)
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psgs[nouts++] = out_sgs;
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psgs[nouts + nins++] = &msg->sg_response;
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if (in_sgs)
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psgs[nouts + nins++] = in_sgs;
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spin_lock_irqsave(&queue->lock, flags);
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rc = virtqueue_add_sgs(queue->vqueue, psgs, nouts, nins, msg,
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GFP_ATOMIC);
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if (!rc) {
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notify = virtqueue_kick_prepare(queue->vqueue);
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list_add_tail(&msg->list, &snd->ctl_msgs);
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}
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spin_unlock_irqrestore(&queue->lock, flags);
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if (rc) {
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dev_err(&vdev->dev, "failed to send control message (0x%08x)\n",
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le32_to_cpu(request->code));
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/*
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* Since in this case virtsnd_ctl_msg_complete() will not be
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* called, it is necessary to decrement the reference count.
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*/
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virtsnd_ctl_msg_unref(msg);
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goto on_exit;
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}
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if (notify)
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virtqueue_notify(queue->vqueue);
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if (nowait)
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goto on_exit;
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rc = wait_for_completion_interruptible_timeout(&msg->notify, js);
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if (rc <= 0) {
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if (!rc) {
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dev_err(&vdev->dev,
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"control message (0x%08x) timeout\n",
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le32_to_cpu(request->code));
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rc = -ETIMEDOUT;
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}
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goto on_exit;
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}
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switch (le32_to_cpu(response->code)) {
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case VIRTIO_SND_S_OK:
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rc = 0;
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break;
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case VIRTIO_SND_S_NOT_SUPP:
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rc = -EOPNOTSUPP;
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break;
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case VIRTIO_SND_S_IO_ERR:
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rc = -EIO;
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break;
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default:
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rc = -EINVAL;
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break;
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}
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on_exit:
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virtsnd_ctl_msg_unref(msg);
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return rc;
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}
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/**
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* virtsnd_ctl_msg_complete() - Complete a control message.
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* @msg: Control message.
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*
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* Context: Any context. Expects the control queue spinlock to be held by
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* caller.
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*/
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void virtsnd_ctl_msg_complete(struct virtio_snd_msg *msg)
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{
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list_del(&msg->list);
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complete(&msg->notify);
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virtsnd_ctl_msg_unref(msg);
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}
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/**
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* virtsnd_ctl_msg_cancel_all() - Cancel all pending control messages.
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* @snd: VirtIO sound device.
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*
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* Context: Any context.
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*/
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void virtsnd_ctl_msg_cancel_all(struct virtio_snd *snd)
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{
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struct virtio_snd_queue *queue = virtsnd_control_queue(snd);
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unsigned long flags;
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spin_lock_irqsave(&queue->lock, flags);
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while (!list_empty(&snd->ctl_msgs)) {
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struct virtio_snd_msg *msg =
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list_first_entry(&snd->ctl_msgs, struct virtio_snd_msg,
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list);
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virtsnd_ctl_msg_complete(msg);
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}
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spin_unlock_irqrestore(&queue->lock, flags);
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}
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/**
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* virtsnd_ctl_query_info() - Query the item configuration from the device.
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* @snd: VirtIO sound device.
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* @command: Control request code (VIRTIO_SND_R_XXX_INFO).
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* @start_id: Item start identifier.
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* @count: Item count to query.
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* @size: Item information size in bytes.
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* @info: Buffer for storing item information.
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*
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* Context: Any context that permits to sleep.
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* Return: 0 on success, -errno on failure.
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*/
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int virtsnd_ctl_query_info(struct virtio_snd *snd, int command, int start_id,
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int count, size_t size, void *info)
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{
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struct virtio_snd_msg *msg;
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struct virtio_snd_query_info *query;
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struct scatterlist sg;
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msg = virtsnd_ctl_msg_alloc(sizeof(*query),
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sizeof(struct virtio_snd_hdr), GFP_KERNEL);
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if (!msg)
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return -ENOMEM;
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query = virtsnd_ctl_msg_request(msg);
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query->hdr.code = cpu_to_le32(command);
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query->start_id = cpu_to_le32(start_id);
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query->count = cpu_to_le32(count);
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query->size = cpu_to_le32(size);
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sg_init_one(&sg, info, count * size);
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return virtsnd_ctl_msg_send(snd, msg, NULL, &sg, false);
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}
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/**
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* virtsnd_ctl_notify_cb() - Process all completed control messages.
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* @vqueue: Underlying control virtqueue.
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*
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* This callback function is called upon a vring interrupt request from the
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* device.
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*
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* Context: Interrupt context. Takes and releases the control queue spinlock.
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*/
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void virtsnd_ctl_notify_cb(struct virtqueue *vqueue)
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{
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struct virtio_snd *snd = vqueue->vdev->priv;
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struct virtio_snd_queue *queue = virtsnd_control_queue(snd);
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struct virtio_snd_msg *msg;
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u32 length;
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unsigned long flags;
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spin_lock_irqsave(&queue->lock, flags);
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do {
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virtqueue_disable_cb(vqueue);
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while ((msg = virtqueue_get_buf(vqueue, &length)))
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virtsnd_ctl_msg_complete(msg);
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if (unlikely(virtqueue_is_broken(vqueue)))
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break;
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} while (!virtqueue_enable_cb(vqueue));
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spin_unlock_irqrestore(&queue->lock, flags);
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}
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