From 49e86f16866fbf8e3c9a6b0770eb6f3c167f4b72 Mon Sep 17 00:00:00 2001 From: Amit Shah Date: Mon, 10 Dec 2012 09:45:12 +1030 Subject: virtio: console: don't rely on virtqueue_add_buf() returning capacity. Signed-off-by: Amit Shah Signed-off-by: Rusty Russell --- drivers/char/virtio_console.c | 2 ++ 1 file changed, 2 insertions(+) (limited to 'drivers/char/virtio_console.c') diff --git a/drivers/char/virtio_console.c b/drivers/char/virtio_console.c index 8ab9c3d4bf13..89bdc31a3dc6 100644 --- a/drivers/char/virtio_console.c +++ b/drivers/char/virtio_console.c @@ -396,6 +396,8 @@ static int add_inbuf(struct virtqueue *vq, struct port_buffer *buf) ret = virtqueue_add_buf(vq, sg, 0, 1, buf, GFP_ATOMIC); virtqueue_kick(vq); + if (!ret) + ret = vq->num_free; return ret; } -- cgit v1.2.3 From 589575a23562b588c82bdb57ed8c09bee5f0f174 Mon Sep 17 00:00:00 2001 From: Rusty Russell Date: Tue, 16 Oct 2012 23:56:15 +1030 Subject: virtio: console: make it clear that virtqueue_add_buf() no longer returns > 0 We simplified virtqueue_add_buf(), make it clear in the callers. Signed-off-by: Rusty Russell --- drivers/char/virtio_console.c | 10 +++++----- 1 file changed, 5 insertions(+), 5 deletions(-) (limited to 'drivers/char/virtio_console.c') diff --git a/drivers/char/virtio_console.c b/drivers/char/virtio_console.c index 89bdc31a3dc6..6a369942da84 100644 --- a/drivers/char/virtio_console.c +++ b/drivers/char/virtio_console.c @@ -461,7 +461,7 @@ static ssize_t __send_control_msg(struct ports_device *portdev, u32 port_id, vq = portdev->c_ovq; sg_init_one(sg, &cpkt, sizeof(cpkt)); - if (virtqueue_add_buf(vq, sg, 1, 0, &cpkt, GFP_ATOMIC) >= 0) { + if (virtqueue_add_buf(vq, sg, 1, 0, &cpkt, GFP_ATOMIC) == 0) { virtqueue_kick(vq); while (!virtqueue_get_buf(vq, &len)) cpu_relax(); @@ -526,7 +526,7 @@ static ssize_t __send_to_port(struct port *port, struct scatterlist *sg, struct buffer_token *tok, bool nonblock) { struct virtqueue *out_vq; - ssize_t ret; + int err; unsigned long flags; unsigned int len; @@ -536,17 +536,17 @@ static ssize_t __send_to_port(struct port *port, struct scatterlist *sg, reclaim_consumed_buffers(port); - ret = virtqueue_add_buf(out_vq, sg, nents, 0, tok, GFP_ATOMIC); + err = virtqueue_add_buf(out_vq, sg, nents, 0, tok, GFP_ATOMIC); /* Tell Host to go! */ virtqueue_kick(out_vq); - if (ret < 0) { + if (err) { in_count = 0; goto done; } - if (ret == 0) + if (out_vq->num_free == 0) port->outvq_full = true; if (nonblock) -- cgit v1.2.3 From fe5295374ec9ac56ba3b619c5c1792b3fd66d859 Mon Sep 17 00:00:00 2001 From: Sjur Brændeland Date: Mon, 15 Oct 2012 09:57:33 +0200 Subject: virtio_console: Free buffer if splice fails MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Free the allocated scatter list if send_pages fails in function port_splice_write. Signed-off-by: Sjur Brændeland Signed-off-by: Rusty Russell --- drivers/char/virtio_console.c | 2 ++ 1 file changed, 2 insertions(+) (limited to 'drivers/char/virtio_console.c') diff --git a/drivers/char/virtio_console.c b/drivers/char/virtio_console.c index 6a369942da84..09d193dbb233 100644 --- a/drivers/char/virtio_console.c +++ b/drivers/char/virtio_console.c @@ -881,6 +881,8 @@ static ssize_t port_fops_splice_write(struct pipe_inode_info *pipe, if (likely(ret > 0)) ret = send_pages(port, sgl.sg, sgl.n, sgl.len, true); + if (unlikely(ret <= 0)) + kfree(sgl.sg); return ret; } -- cgit v1.2.3 From 0127f6855e643c6b8fd5fbe3b5fa23c9d26cd237 Mon Sep 17 00:00:00 2001 From: Sjur Brændeland Date: Mon, 15 Oct 2012 09:57:34 +0200 Subject: virtio_console: Use kmalloc instead of kzalloc MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Avoid the more cpu expensive kzalloc when allocating buffers. Originally kzalloc was intended for isolating the guest from the host by not sending random guest data to the host. But device isolation is not yet in place so kzalloc is not really needed. Signed-off-by: Sjur Brændeland Signed-off-by: Rusty Russell --- drivers/char/virtio_console.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'drivers/char/virtio_console.c') diff --git a/drivers/char/virtio_console.c b/drivers/char/virtio_console.c index 09d193dbb233..eecb1f9e2e6b 100644 --- a/drivers/char/virtio_console.c +++ b/drivers/char/virtio_console.c @@ -349,7 +349,7 @@ static struct port_buffer *alloc_buf(size_t buf_size) buf = kmalloc(sizeof(*buf), GFP_KERNEL); if (!buf) goto fail; - buf->buf = kzalloc(buf_size, GFP_KERNEL); + buf->buf = kmalloc(buf_size, GFP_KERNEL); if (!buf->buf) goto free_buf; buf->len = 0; -- cgit v1.2.3 From eb34f12b509823571e88b791ae2088280943894f Mon Sep 17 00:00:00 2001 From: "sjur.brandeland@stericsson.com" Date: Fri, 16 Nov 2012 11:20:19 +1030 Subject: virtio_console: Free buffers from out-queue upon close MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Free pending output buffers from the virtio out-queue when host has acknowledged port_close. Signed-off-by: Sjur Brændeland Signed-off-by: Rusty Russell (rebased & cut down) --- drivers/char/virtio_console.c | 4 ++++ 1 file changed, 4 insertions(+) (limited to 'drivers/char/virtio_console.c') diff --git a/drivers/char/virtio_console.c b/drivers/char/virtio_console.c index eecb1f9e2e6b..db244b5b6c8a 100644 --- a/drivers/char/virtio_console.c +++ b/drivers/char/virtio_console.c @@ -1439,6 +1439,10 @@ static void remove_port_data(struct port *port) /* Remove buffers we queued up for the Host to send us data in. */ while ((buf = virtqueue_detach_unused_buf(port->in_vq))) free_buf(buf); + + /* Free pending buffers from the out-queue. */ + while ((buf = virtqueue_detach_unused_buf(port->out_vq))) + free_buf(buf); } /* -- cgit v1.2.3 From 276a3e954cfe4da7c492c9063741f99290d2973e Mon Sep 17 00:00:00 2001 From: Sjur Brændeland Date: Fri, 14 Dec 2012 13:46:42 +1030 Subject: virtio_console: Merge struct buffer_token into struct port_buffer MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Refactoring the splice functionality by unifying the approach for sending scatter-lists and regular buffers. This simplifies buffer handling and reduces code size. Splice will now allocate a port_buffer and send_buf() and free_buf() can always be used for any buffer. Signed-off-by: Sjur Brændeland Acked-by: Amit Shah Signed-off-by: Rusty Russell --- drivers/char/virtio_console.c | 129 +++++++++++++++++------------------------- 1 file changed, 53 insertions(+), 76 deletions(-) (limited to 'drivers/char/virtio_console.c') diff --git a/drivers/char/virtio_console.c b/drivers/char/virtio_console.c index db244b5b6c8a..548224686963 100644 --- a/drivers/char/virtio_console.c +++ b/drivers/char/virtio_console.c @@ -111,6 +111,12 @@ struct port_buffer { size_t len; /* offset in the buf from which to consume data */ size_t offset; + + /* If sgpages == 0 then buf is used */ + unsigned int sgpages; + + /* sg is used if spages > 0. sg must be the last in is struct */ + struct scatterlist sg[0]; }; /* @@ -338,17 +344,39 @@ static inline bool use_multiport(struct ports_device *portdev) static void free_buf(struct port_buffer *buf) { + unsigned int i; + kfree(buf->buf); + for (i = 0; i < buf->sgpages; i++) { + struct page *page = sg_page(&buf->sg[i]); + if (!page) + break; + put_page(page); + } + kfree(buf); } -static struct port_buffer *alloc_buf(size_t buf_size) +static struct port_buffer *alloc_buf(struct virtqueue *vq, size_t buf_size, + int pages) { struct port_buffer *buf; - buf = kmalloc(sizeof(*buf), GFP_KERNEL); + /* + * Allocate buffer and the sg list. The sg list array is allocated + * directly after the port_buffer struct. + */ + buf = kmalloc(sizeof(*buf) + sizeof(struct scatterlist) * pages, + GFP_KERNEL); if (!buf) goto fail; + + buf->sgpages = pages; + if (pages > 0) { + buf->buf = NULL; + return buf; + } + buf->buf = kmalloc(buf_size, GFP_KERNEL); if (!buf->buf) goto free_buf; @@ -478,52 +506,26 @@ static ssize_t send_control_msg(struct port *port, unsigned int event, return 0; } -struct buffer_token { - union { - void *buf; - struct scatterlist *sg; - } u; - /* If sgpages == 0 then buf is used, else sg is used */ - unsigned int sgpages; -}; - -static void reclaim_sg_pages(struct scatterlist *sg, unsigned int nrpages) -{ - int i; - struct page *page; - - for (i = 0; i < nrpages; i++) { - page = sg_page(&sg[i]); - if (!page) - break; - put_page(page); - } - kfree(sg); -} /* Callers must take the port->outvq_lock */ static void reclaim_consumed_buffers(struct port *port) { - struct buffer_token *tok; + struct port_buffer *buf; unsigned int len; if (!port->portdev) { /* Device has been unplugged. vqs are already gone. */ return; } - while ((tok = virtqueue_get_buf(port->out_vq, &len))) { - if (tok->sgpages) - reclaim_sg_pages(tok->u.sg, tok->sgpages); - else - kfree(tok->u.buf); - kfree(tok); + while ((buf = virtqueue_get_buf(port->out_vq, &len))) { + free_buf(buf); port->outvq_full = false; } } static ssize_t __send_to_port(struct port *port, struct scatterlist *sg, int nents, size_t in_count, - struct buffer_token *tok, bool nonblock) + void *data, bool nonblock) { struct virtqueue *out_vq; int err; @@ -536,7 +538,7 @@ static ssize_t __send_to_port(struct port *port, struct scatterlist *sg, reclaim_consumed_buffers(port); - err = virtqueue_add_buf(out_vq, sg, nents, 0, tok, GFP_ATOMIC); + err = virtqueue_add_buf(out_vq, sg, nents, 0, data, GFP_ATOMIC); /* Tell Host to go! */ virtqueue_kick(out_vq); @@ -574,37 +576,6 @@ done: return in_count; } -static ssize_t send_buf(struct port *port, void *in_buf, size_t in_count, - bool nonblock) -{ - struct scatterlist sg[1]; - struct buffer_token *tok; - - tok = kmalloc(sizeof(*tok), GFP_ATOMIC); - if (!tok) - return -ENOMEM; - tok->sgpages = 0; - tok->u.buf = in_buf; - - sg_init_one(sg, in_buf, in_count); - - return __send_to_port(port, sg, 1, in_count, tok, nonblock); -} - -static ssize_t send_pages(struct port *port, struct scatterlist *sg, int nents, - size_t in_count, bool nonblock) -{ - struct buffer_token *tok; - - tok = kmalloc(sizeof(*tok), GFP_ATOMIC); - if (!tok) - return -ENOMEM; - tok->sgpages = nents; - tok->u.sg = sg; - - return __send_to_port(port, sg, nents, in_count, tok, nonblock); -} - /* * Give out the data that's requested from the buffer that we have * queued up. @@ -750,9 +721,10 @@ static ssize_t port_fops_write(struct file *filp, const char __user *ubuf, size_t count, loff_t *offp) { struct port *port; - char *buf; + struct port_buffer *buf; ssize_t ret; bool nonblock; + struct scatterlist sg[1]; /* Userspace could be out to fool us */ if (!count) @@ -768,11 +740,11 @@ static ssize_t port_fops_write(struct file *filp, const char __user *ubuf, count = min((size_t)(32 * 1024), count); - buf = kmalloc(count, GFP_KERNEL); + buf = alloc_buf(port->out_vq, count, 0); if (!buf) return -ENOMEM; - ret = copy_from_user(buf, ubuf, count); + ret = copy_from_user(buf->buf, ubuf, count); if (ret) { ret = -EFAULT; goto free_buf; @@ -786,13 +758,14 @@ static ssize_t port_fops_write(struct file *filp, const char __user *ubuf, * through to the host. */ nonblock = true; - ret = send_buf(port, buf, count, nonblock); + sg_init_one(sg, buf->buf, count); + ret = __send_to_port(port, sg, 1, count, buf, nonblock); if (nonblock && ret > 0) goto out; free_buf: - kfree(buf); + free_buf(buf); out: return ret; } @@ -858,6 +831,7 @@ static ssize_t port_fops_splice_write(struct pipe_inode_info *pipe, struct port *port = filp->private_data; struct sg_list sgl; ssize_t ret; + struct port_buffer *buf; struct splice_desc sd = { .total_len = len, .flags = flags, @@ -869,17 +843,18 @@ static ssize_t port_fops_splice_write(struct pipe_inode_info *pipe, if (ret < 0) return ret; + buf = alloc_buf(port->out_vq, 0, pipe->nrbufs); + if (!buf) + return -ENOMEM; + sgl.n = 0; sgl.len = 0; sgl.size = pipe->nrbufs; - sgl.sg = kmalloc(sizeof(struct scatterlist) * sgl.size, GFP_KERNEL); - if (unlikely(!sgl.sg)) - return -ENOMEM; - + sgl.sg = buf->sg; sg_init_table(sgl.sg, sgl.size); ret = __splice_from_pipe(pipe, &sd, pipe_to_sg); if (likely(ret > 0)) - ret = send_pages(port, sgl.sg, sgl.n, sgl.len, true); + ret = __send_to_port(port, buf->sg, sgl.n, sgl.len, buf, true); if (unlikely(ret <= 0)) kfree(sgl.sg); @@ -1035,6 +1010,7 @@ static const struct file_operations port_fops = { static int put_chars(u32 vtermno, const char *buf, int count) { struct port *port; + struct scatterlist sg[1]; if (unlikely(early_put_chars)) return early_put_chars(vtermno, buf, count); @@ -1043,7 +1019,8 @@ static int put_chars(u32 vtermno, const char *buf, int count) if (!port) return -EPIPE; - return send_buf(port, (void *)buf, count, false); + sg_init_one(sg, buf, count); + return __send_to_port(port, sg, 1, count, (void *)buf, false); } /* @@ -1264,7 +1241,7 @@ static unsigned int fill_queue(struct virtqueue *vq, spinlock_t *lock) nr_added_bufs = 0; do { - buf = alloc_buf(PAGE_SIZE); + buf = alloc_buf(vq, PAGE_SIZE, 0); if (!buf) break; -- cgit v1.2.3 From 1b6370463e88b0c1c317de16d7b962acc1dab4f2 Mon Sep 17 00:00:00 2001 From: Sjur Brændeland Date: Fri, 14 Dec 2012 14:40:51 +1030 Subject: virtio_console: Add support for remoteproc serial MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Add a simple serial connection driver called VIRTIO_ID_RPROC_SERIAL (11) for communicating with a remote processor in an asymmetric multi-processing configuration. This implementation reuses the existing virtio_console implementation, and adds support for DMA allocation of data buffers and disables use of tty console and the virtio control queue. Signed-off-by: Sjur Brændeland Acked-by: Amit Shah Signed-off-by: Rusty Russell --- drivers/char/virtio_console.c | 192 +++++++++++++++++++++++++++++++++++----- include/uapi/linux/virtio_ids.h | 1 + 2 files changed, 170 insertions(+), 23 deletions(-) (limited to 'drivers/char/virtio_console.c') diff --git a/drivers/char/virtio_console.c b/drivers/char/virtio_console.c index 548224686963..55a89a4ae42f 100644 --- a/drivers/char/virtio_console.c +++ b/drivers/char/virtio_console.c @@ -37,8 +37,12 @@ #include #include #include +#include +#include #include "../tty/hvc/hvc_console.h" +#define is_rproc_enabled IS_ENABLED(CONFIG_REMOTEPROC) + /* * This is a global struct for storing common data for all the devices * this driver handles. @@ -112,6 +116,15 @@ struct port_buffer { /* offset in the buf from which to consume data */ size_t offset; + /* DMA address of buffer */ + dma_addr_t dma; + + /* Device we got DMA memory from */ + struct device *dev; + + /* List of pending dma buffers to free */ + struct list_head list; + /* If sgpages == 0 then buf is used */ unsigned int sgpages; @@ -331,6 +344,11 @@ static bool is_console_port(struct port *port) return false; } +static bool is_rproc_serial(const struct virtio_device *vdev) +{ + return is_rproc_enabled && vdev->id.device == VIRTIO_ID_RPROC_SERIAL; +} + static inline bool use_multiport(struct ports_device *portdev) { /* @@ -342,11 +360,13 @@ static inline bool use_multiport(struct ports_device *portdev) return portdev->vdev->features[0] & (1 << VIRTIO_CONSOLE_F_MULTIPORT); } -static void free_buf(struct port_buffer *buf) +static DEFINE_SPINLOCK(dma_bufs_lock); +static LIST_HEAD(pending_free_dma_bufs); + +static void free_buf(struct port_buffer *buf, bool can_sleep) { unsigned int i; - kfree(buf->buf); for (i = 0; i < buf->sgpages; i++) { struct page *page = sg_page(&buf->sg[i]); if (!page) @@ -354,14 +374,57 @@ static void free_buf(struct port_buffer *buf) put_page(page); } + if (!buf->dev) { + kfree(buf->buf); + } else if (is_rproc_enabled) { + unsigned long flags; + + /* dma_free_coherent requires interrupts to be enabled. */ + if (!can_sleep) { + /* queue up dma-buffers to be freed later */ + spin_lock_irqsave(&dma_bufs_lock, flags); + list_add_tail(&buf->list, &pending_free_dma_bufs); + spin_unlock_irqrestore(&dma_bufs_lock, flags); + return; + } + dma_free_coherent(buf->dev, buf->size, buf->buf, buf->dma); + + /* Release device refcnt and allow it to be freed */ + put_device(buf->dev); + } + kfree(buf); } +static void reclaim_dma_bufs(void) +{ + unsigned long flags; + struct port_buffer *buf, *tmp; + LIST_HEAD(tmp_list); + + if (list_empty(&pending_free_dma_bufs)) + return; + + /* Create a copy of the pending_free_dma_bufs while holding the lock */ + spin_lock_irqsave(&dma_bufs_lock, flags); + list_cut_position(&tmp_list, &pending_free_dma_bufs, + pending_free_dma_bufs.prev); + spin_unlock_irqrestore(&dma_bufs_lock, flags); + + /* Release the dma buffers, without irqs enabled */ + list_for_each_entry_safe(buf, tmp, &tmp_list, list) { + list_del(&buf->list); + free_buf(buf, true); + } +} + static struct port_buffer *alloc_buf(struct virtqueue *vq, size_t buf_size, int pages) { struct port_buffer *buf; + reclaim_dma_bufs(); + /* * Allocate buffer and the sg list. The sg list array is allocated * directly after the port_buffer struct. @@ -373,11 +436,34 @@ static struct port_buffer *alloc_buf(struct virtqueue *vq, size_t buf_size, buf->sgpages = pages; if (pages > 0) { + buf->dev = NULL; buf->buf = NULL; return buf; } - buf->buf = kmalloc(buf_size, GFP_KERNEL); + if (is_rproc_serial(vq->vdev)) { + /* + * Allocate DMA memory from ancestor. When a virtio + * device is created by remoteproc, the DMA memory is + * associated with the grandparent device: + * vdev => rproc => platform-dev. + * The code here would have been less quirky if + * DMA_MEMORY_INCLUDES_CHILDREN had been supported + * in dma-coherent.c + */ + if (!vq->vdev->dev.parent || !vq->vdev->dev.parent->parent) + goto free_buf; + buf->dev = vq->vdev->dev.parent->parent; + + /* Increase device refcnt to avoid freeing it */ + get_device(buf->dev); + buf->buf = dma_alloc_coherent(buf->dev, buf_size, &buf->dma, + GFP_KERNEL); + } else { + buf->dev = NULL; + buf->buf = kmalloc(buf_size, GFP_KERNEL); + } + if (!buf->buf) goto free_buf; buf->len = 0; @@ -446,7 +532,7 @@ static void discard_port_data(struct port *port) port->stats.bytes_discarded += buf->len - buf->offset; if (add_inbuf(port->in_vq, buf) < 0) { err++; - free_buf(buf); + free_buf(buf, false); } port->inbuf = NULL; buf = get_inbuf(port); @@ -518,7 +604,7 @@ static void reclaim_consumed_buffers(struct port *port) return; } while ((buf = virtqueue_get_buf(port->out_vq, &len))) { - free_buf(buf); + free_buf(buf, false); port->outvq_full = false; } } @@ -765,7 +851,7 @@ static ssize_t port_fops_write(struct file *filp, const char __user *ubuf, goto out; free_buf: - free_buf(buf); + free_buf(buf, true); out: return ret; } @@ -839,6 +925,15 @@ static ssize_t port_fops_splice_write(struct pipe_inode_info *pipe, .u.data = &sgl, }; + /* + * Rproc_serial does not yet support splice. To support splice + * pipe_to_sg() must allocate dma-buffers and copy content from + * regular pages to dma pages. And alloc_buf and free_buf must + * support allocating and freeing such a list of dma-buffers. + */ + if (is_rproc_serial(port->out_vq->vdev)) + return -EINVAL; + ret = wait_port_writable(port, filp->f_flags & O_NONBLOCK); if (ret < 0) return ret; @@ -857,7 +952,7 @@ static ssize_t port_fops_splice_write(struct pipe_inode_info *pipe, ret = __send_to_port(port, buf->sg, sgl.n, sgl.len, buf, true); if (unlikely(ret <= 0)) - kfree(sgl.sg); + free_buf(buf, true); return ret; } @@ -906,6 +1001,7 @@ static int port_fops_release(struct inode *inode, struct file *filp) reclaim_consumed_buffers(port); spin_unlock_irq(&port->outvq_lock); + reclaim_dma_bufs(); /* * Locks aren't necessary here as a port can't be opened after * unplug, and if a port isn't unplugged, a kref would already @@ -1057,7 +1153,10 @@ static void resize_console(struct port *port) return; vdev = port->portdev->vdev; - if (virtio_has_feature(vdev, VIRTIO_CONSOLE_F_SIZE)) + + /* Don't test F_SIZE at all if we're rproc: not a valid feature! */ + if (!is_rproc_serial(vdev) && + virtio_has_feature(vdev, VIRTIO_CONSOLE_F_SIZE)) hvc_resize(port->cons.hvc, port->cons.ws); } @@ -1249,7 +1348,7 @@ static unsigned int fill_queue(struct virtqueue *vq, spinlock_t *lock) ret = add_inbuf(vq, buf); if (ret < 0) { spin_unlock_irq(lock); - free_buf(buf); + free_buf(buf, true); break; } nr_added_bufs++; @@ -1337,10 +1436,18 @@ static int add_port(struct ports_device *portdev, u32 id) goto free_device; } - /* - * If we're not using multiport support, this has to be a console port - */ - if (!use_multiport(port->portdev)) { + if (is_rproc_serial(port->portdev->vdev)) + /* + * For rproc_serial assume remote processor is connected. + * rproc_serial does not want the console port, only + * the generic port implementation. + */ + port->host_connected = true; + else if (!use_multiport(port->portdev)) { + /* + * If we're not using multiport support, + * this has to be a console port. + */ err = init_port_console(port); if (err) goto free_inbufs; @@ -1373,7 +1480,7 @@ static int add_port(struct ports_device *portdev, u32 id) free_inbufs: while ((buf = virtqueue_detach_unused_buf(port->in_vq))) - free_buf(buf); + free_buf(buf, true); free_device: device_destroy(pdrvdata.class, port->dev->devt); free_cdev: @@ -1415,11 +1522,11 @@ static void remove_port_data(struct port *port) /* Remove buffers we queued up for the Host to send us data in. */ while ((buf = virtqueue_detach_unused_buf(port->in_vq))) - free_buf(buf); + free_buf(buf, true); /* Free pending buffers from the out-queue. */ while ((buf = virtqueue_detach_unused_buf(port->out_vq))) - free_buf(buf); + free_buf(buf, true); } /* @@ -1621,7 +1728,7 @@ static void control_work_handler(struct work_struct *work) if (add_inbuf(portdev->c_ivq, buf) < 0) { dev_warn(&portdev->vdev->dev, "Error adding buffer to queue\n"); - free_buf(buf); + free_buf(buf, false); } } spin_unlock(&portdev->cvq_lock); @@ -1817,10 +1924,10 @@ static void remove_controlq_data(struct ports_device *portdev) return; while ((buf = virtqueue_get_buf(portdev->c_ivq, &len))) - free_buf(buf); + free_buf(buf, true); while ((buf = virtqueue_detach_unused_buf(portdev->c_ivq))) - free_buf(buf); + free_buf(buf, true); } /* @@ -1867,11 +1974,15 @@ static int __devinit virtcons_probe(struct virtio_device *vdev) multiport = false; portdev->config.max_nr_ports = 1; - if (virtio_config_val(vdev, VIRTIO_CONSOLE_F_MULTIPORT, - offsetof(struct virtio_console_config, - max_nr_ports), - &portdev->config.max_nr_ports) == 0) + + /* Don't test MULTIPORT at all if we're rproc: not a valid feature! */ + if (!is_rproc_serial(vdev) && + virtio_config_val(vdev, VIRTIO_CONSOLE_F_MULTIPORT, + offsetof(struct virtio_console_config, + max_nr_ports), + &portdev->config.max_nr_ports) == 0) { multiport = true; + } err = init_vqs(portdev); if (err < 0) { @@ -1981,6 +2092,16 @@ static unsigned int features[] = { VIRTIO_CONSOLE_F_MULTIPORT, }; +static struct virtio_device_id rproc_serial_id_table[] = { +#if IS_ENABLED(CONFIG_REMOTEPROC) + { VIRTIO_ID_RPROC_SERIAL, VIRTIO_DEV_ANY_ID }, +#endif + { 0 }, +}; + +static unsigned int rproc_serial_features[] = { +}; + #ifdef CONFIG_PM static int virtcons_freeze(struct virtio_device *vdev) { @@ -2065,6 +2186,20 @@ static struct virtio_driver virtio_console = { #endif }; +/* + * virtio_rproc_serial refers to __devinit function which causes + * section mismatch warnings. So use __refdata to silence warnings. + */ +static struct virtio_driver __refdata virtio_rproc_serial = { + .feature_table = rproc_serial_features, + .feature_table_size = ARRAY_SIZE(rproc_serial_features), + .driver.name = "virtio_rproc_serial", + .driver.owner = THIS_MODULE, + .id_table = rproc_serial_id_table, + .probe = virtcons_probe, + .remove = virtcons_remove, +}; + static int __init init(void) { int err; @@ -2089,7 +2224,15 @@ static int __init init(void) pr_err("Error %d registering virtio driver\n", err); goto free; } + err = register_virtio_driver(&virtio_rproc_serial); + if (err < 0) { + pr_err("Error %d registering virtio rproc serial driver\n", + err); + goto unregister; + } return 0; +unregister: + unregister_virtio_driver(&virtio_console); free: if (pdrvdata.debugfs_dir) debugfs_remove_recursive(pdrvdata.debugfs_dir); @@ -2099,7 +2242,10 @@ free: static void __exit fini(void) { + reclaim_dma_bufs(); + unregister_virtio_driver(&virtio_console); + unregister_virtio_driver(&virtio_rproc_serial); class_destroy(pdrvdata.class); if (pdrvdata.debugfs_dir) diff --git a/include/uapi/linux/virtio_ids.h b/include/uapi/linux/virtio_ids.h index 270fb22c5811..a7630d04029f 100644 --- a/include/uapi/linux/virtio_ids.h +++ b/include/uapi/linux/virtio_ids.h @@ -37,5 +37,6 @@ #define VIRTIO_ID_RPMSG 7 /* virtio remote processor messaging */ #define VIRTIO_ID_SCSI 8 /* virtio scsi */ #define VIRTIO_ID_9P 9 /* 9p virtio console */ +#define VIRTIO_ID_RPROC_SERIAL 11 /* virtio remoteproc serial link */ #endif /* _LINUX_VIRTIO_IDS_H */ -- cgit v1.2.3