From 92b38f851470f8d8ea7ed638d546f83b5268bc12 Mon Sep 17 00:00:00 2001 From: Sjur Brændeland Date: Thu, 21 Feb 2013 18:15:39 +0100 Subject: remoteproc: support virtio config space. MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Support virtio configuration space and device status. The virtio device can now access the resource table in shared memory. Signed-off-by: Sjur Brændeland Acked-by: Ido Yariv [rebase and style changes] Signed-off-by: Ohad Ben-Cohen --- drivers/remoteproc/remoteproc_core.c | 3 -- drivers/remoteproc/remoteproc_virtio.c | 79 +++++++++++++++++++++++++++------- 2 files changed, 64 insertions(+), 18 deletions(-) (limited to 'drivers/remoteproc') diff --git a/drivers/remoteproc/remoteproc_core.c b/drivers/remoteproc/remoteproc_core.c index 617b825aa553..d0251fe9e119 100644 --- a/drivers/remoteproc/remoteproc_core.c +++ b/drivers/remoteproc/remoteproc_core.c @@ -345,9 +345,6 @@ static int rproc_handle_vdev(struct rproc *rproc, struct fw_rsc_vdev *rsc, goto free_rvdev; } - /* remember the device features */ - rvdev->dfeatures = rsc->dfeatures; - /* remember the resource offset*/ rvdev->rsc_offset = offset; diff --git a/drivers/remoteproc/remoteproc_virtio.c b/drivers/remoteproc/remoteproc_virtio.c index afed9b7731c4..b09c75c21b60 100644 --- a/drivers/remoteproc/remoteproc_virtio.c +++ b/drivers/remoteproc/remoteproc_virtio.c @@ -173,25 +173,35 @@ error: return ret; } -/* - * We don't support yet real virtio status semantics. - * - * The plan is to provide this via the VDEV resource entry - * which is part of the firmware: this way the remote processor - * will be able to access the status values as set by us. - */ static u8 rproc_virtio_get_status(struct virtio_device *vdev) { - return 0; + struct rproc_vdev *rvdev = vdev_to_rvdev(vdev); + struct fw_rsc_vdev *rsc; + + rsc = (void *)rvdev->rproc->table_ptr + rvdev->rsc_offset; + + return rsc->status; } static void rproc_virtio_set_status(struct virtio_device *vdev, u8 status) { + struct rproc_vdev *rvdev = vdev_to_rvdev(vdev); + struct fw_rsc_vdev *rsc; + + rsc = (void *)rvdev->rproc->table_ptr + rvdev->rsc_offset; + + rsc->status = status; dev_dbg(&vdev->dev, "status: %d\n", status); } static void rproc_virtio_reset(struct virtio_device *vdev) { + struct rproc_vdev *rvdev = vdev_to_rvdev(vdev); + struct fw_rsc_vdev *rsc; + + rsc = (void *)rvdev->rproc->table_ptr + rvdev->rsc_offset; + + rsc->status = 0; dev_dbg(&vdev->dev, "reset !\n"); } @@ -199,13 +209,19 @@ static void rproc_virtio_reset(struct virtio_device *vdev) static u32 rproc_virtio_get_features(struct virtio_device *vdev) { struct rproc_vdev *rvdev = vdev_to_rvdev(vdev); + struct fw_rsc_vdev *rsc; + + rsc = (void *)rvdev->rproc->table_ptr + rvdev->rsc_offset; - return rvdev->dfeatures; + return rsc->dfeatures; } static void rproc_virtio_finalize_features(struct virtio_device *vdev) { struct rproc_vdev *rvdev = vdev_to_rvdev(vdev); + struct fw_rsc_vdev *rsc; + + rsc = (void *)rvdev->rproc->table_ptr + rvdev->rsc_offset; /* Give virtio_ring a chance to accept features */ vring_transport_features(vdev); @@ -213,13 +229,44 @@ static void rproc_virtio_finalize_features(struct virtio_device *vdev) /* * Remember the finalized features of our vdev, and provide it * to the remote processor once it is powered on. - * - * Similarly to the status field, we don't expose yet the negotiated - * features to the remote processors at this point. This will be - * fixed as part of a small resource table overhaul and then an - * extension of the virtio resource entries. */ - rvdev->gfeatures = vdev->features[0]; + rsc->gfeatures = vdev->features[0]; +} + +static void rproc_virtio_get(struct virtio_device *vdev, unsigned offset, + void *buf, unsigned len) +{ + struct rproc_vdev *rvdev = vdev_to_rvdev(vdev); + struct fw_rsc_vdev *rsc; + void *cfg; + + rsc = (void *)rvdev->rproc->table_ptr + rvdev->rsc_offset; + cfg = &rsc->vring[rsc->num_of_vrings]; + + if (offset + len > rsc->config_len || offset + len < len) { + dev_err(&vdev->dev, "rproc_virtio_get: access out of bounds\n"); + return; + } + + memcpy(buf, cfg + offset, len); +} + +static void rproc_virtio_set(struct virtio_device *vdev, unsigned offset, + const void *buf, unsigned len) +{ + struct rproc_vdev *rvdev = vdev_to_rvdev(vdev); + struct fw_rsc_vdev *rsc; + void *cfg; + + rsc = (void *)rvdev->rproc->table_ptr + rvdev->rsc_offset; + cfg = &rsc->vring[rsc->num_of_vrings]; + + if (offset + len > rsc->config_len || offset + len < len) { + dev_err(&vdev->dev, "rproc_virtio_set: access out of bounds\n"); + return; + } + + memcpy(cfg + offset, buf, len); } static const struct virtio_config_ops rproc_virtio_config_ops = { @@ -230,6 +277,8 @@ static const struct virtio_config_ops rproc_virtio_config_ops = { .reset = rproc_virtio_reset, .set_status = rproc_virtio_set_status, .get_status = rproc_virtio_get_status, + .get = rproc_virtio_get, + .set = rproc_virtio_set, }; /* -- cgit v1.2.3-59-g8ed1b