From: Bjorn Andersson <bjorn.andersson@linaro.org>
To: Loic Pallardy <loic.pallardy@st.com>
Cc: ohad@wizery.com, linux-remoteproc@vger.kernel.org,
linux-kernel@vger.kernel.org, arnaud.pouliquen@st.com,
benjamin.gaignard@linaro.org
Subject: Re: [PATCH v2 13/16] remoteproc: look-up memory-device for virtio device allocation
Date: Wed, 13 Dec 2017 21:32:48 -0800 [thread overview]
Message-ID: <20171214053248.GN17344@builder> (raw)
In-Reply-To: <1512060411-729-14-git-send-email-loic.pallardy@st.com>
On Thu 30 Nov 08:46 PST 2017, Loic Pallardy wrote:
> This patch parse existing carveout list to find a memory area
> matching on "vdev<vdev_id>buffer" name.
> If found, memory device will be used as parent for vdev creation, else
> rproc platform device will be used as today.
>
> Signed-off-by: Loic Pallardy <loic.pallardy@st.com>
> ---
> drivers/remoteproc/remoteproc_core.c | 13 +++++++++++++
> drivers/remoteproc/remoteproc_virtio.c | 2 +-
> include/linux/remoteproc.h | 1 +
> 3 files changed, 15 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/remoteproc/remoteproc_core.c b/drivers/remoteproc/remoteproc_core.c
> index 6b5e2b2..9c12319 100644
> --- a/drivers/remoteproc/remoteproc_core.c
> +++ b/drivers/remoteproc/remoteproc_core.c
> @@ -583,8 +583,11 @@ static int rproc_handle_vdev(struct rproc *rproc, struct fw_rsc_vdev *rsc,
> {
> struct device *dev = &rproc->dev;
> struct rproc_vdev *rvdev;
> + struct device *memdev = dev->parent;
> + struct rproc_mem_entry *carveout;
> int i, ret;
> static int index;
> + char name[16];
>
> /* make sure resource isn't truncated */
> if (sizeof(*rsc) + rsc->num_of_vrings * sizeof(struct fw_rsc_vdev_vring)
> @@ -637,6 +640,16 @@ static int rproc_handle_vdev(struct rproc *rproc, struct fw_rsc_vdev *rsc,
>
> list_add_tail(&rvdev->node, &rproc->rvdevs);
>
> + /* Find associated registered carveout. */
> + /* Try dedicated vdev buffer pool. */
> + snprintf(name, sizeof(name), "vdev%dbuffer", rvdev->index);
> + carveout = rproc_find_carveout_by_name(rproc, name);
> +
> + if (carveout && carveout->memdev)
> + memdev = &carveout->memdev->dev;
> +
> + rvdev->dev = memdev;
> +
> rproc_add_subdev(rproc, &rvdev->subdev,
> rproc_vdev_do_probe, rproc_vdev_do_remove);
>
> diff --git a/drivers/remoteproc/remoteproc_virtio.c b/drivers/remoteproc/remoteproc_virtio.c
> index 2946348..1f7a444 100644
> --- a/drivers/remoteproc/remoteproc_virtio.c
> +++ b/drivers/remoteproc/remoteproc_virtio.c
> @@ -303,7 +303,7 @@ static void rproc_virtio_dev_release(struct device *dev)
> int rproc_add_virtio_dev(struct rproc_vdev *rvdev, int id)
> {
> struct rproc *rproc = rvdev->rproc;
> - struct device *dev = &rproc->dev;
> + struct device *dev = rvdev->dev;
This will cause the device structure to change shape based on there
being a match of a carveout or not.
I also think it's preferable to limit the life cycle of the allocations
in this memory region to a single start->stop cycle, rather than
boot->shutdown.
So I think it makes more sense to use the vdev->dev and
dmam_declare_coherent_memory on this. But as in the previous patch this
can't be a carveout that has been remapped already.
A somewhat unrelated topic to this is the ability to associate DT nodes
to rpmsg devices (I do this for the Qualcomm children), in this case we
would have a DT node per vdev under the remoteproc, perhaps it would
make more sense to introduce that and put the memory-region in that
node. Only thin that comes to mind is that we still need to match a
carveout in the resource table, in order to communicate the buffer
region to the remote side for your memory protection purposes.
Regards,
Bjorn
next prev parent reply other threads:[~2017-12-14 5:32 UTC|newest]
Thread overview: 48+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-11-30 16:46 [PATCH v2 00/16] remoteproc: add fixed memory region support Loic Pallardy
2017-11-30 16:46 ` [PATCH v2 01/16] remoteproc: add rproc_va_to_pa function Loic Pallardy
2017-12-14 0:30 ` Bjorn Andersson
2018-01-12 7:43 ` Loic PALLARDY
2017-11-30 16:46 ` [PATCH v2 02/16] remoteproc: add release ops in rproc_mem_entry struct Loic Pallardy
2017-12-14 0:34 ` Bjorn Andersson
2018-01-12 7:43 ` Loic PALLARDY
2017-11-30 16:46 ` [PATCH v2 03/16] remoteproc: introduce rproc_add_carveout function Loic Pallardy
2017-12-14 0:36 ` Bjorn Andersson
2018-01-12 7:45 ` Loic PALLARDY
2017-11-30 16:46 ` [PATCH v2 04/16] remoteproc: introduce rproc_find_carveout_by_da Loic Pallardy
2017-12-14 0:45 ` Bjorn Andersson
2018-01-12 7:48 ` Loic PALLARDY
2017-11-30 16:46 ` [PATCH v2 05/16] remoteproc: modify rproc_handle_carveout to support preallocated region Loic Pallardy
2017-12-14 0:59 ` Bjorn Andersson
2018-01-12 7:56 ` Loic PALLARDY
2018-10-23 17:40 ` Suman Anna
2018-10-23 19:09 ` Loic PALLARDY
2018-10-23 19:12 ` Suman Anna
2017-11-30 16:46 ` [PATCH v2 06/16] remoteproc: modify vring allocation " Loic Pallardy
2017-12-14 1:09 ` Bjorn Andersson
2018-01-12 8:13 ` Loic PALLARDY
2017-11-30 16:46 ` [PATCH v2 07/16] remoteproc: st: add reserved memory support Loic Pallardy
2017-12-14 1:15 ` Bjorn Andersson
2018-01-12 8:19 ` Loic PALLARDY
2017-11-30 16:46 ` [PATCH v2 08/16] remoteproc: add name in rproc_mem_entry struct Loic Pallardy
2017-12-14 1:21 ` Bjorn Andersson
2018-01-12 8:19 ` Loic PALLARDY
2017-11-30 16:46 ` [PATCH v2 09/16] remoteproc: add memory device management support Loic Pallardy
2017-11-30 16:46 ` [PATCH v2 10/16] remoteproc: add memory device registering in rproc_add_carveout Loic Pallardy
2017-12-14 1:29 ` Bjorn Andersson
2018-01-15 9:09 ` Loic PALLARDY
2017-11-30 16:46 ` [PATCH v2 11/16] remoteproc: introduce rproc_find_carveout_by_name function Loic Pallardy
2017-12-14 1:32 ` Bjorn Andersson
2018-01-15 9:10 ` Loic PALLARDY
2017-11-30 16:46 ` [PATCH v2 12/16] remoteproc: look-up memory-device for vring allocation Loic Pallardy
2017-12-14 1:44 ` Bjorn Andersson
2018-01-15 20:44 ` Loic PALLARDY
2017-11-30 16:46 ` [PATCH v2 13/16] remoteproc: look-up memory-device for virtio device allocation Loic Pallardy
2017-12-14 5:32 ` Bjorn Andersson [this message]
2018-01-15 20:57 ` Loic PALLARDY
2017-11-30 16:46 ` [PATCH v2 14/16] remoteproc: look-up pre-registered carveout by name for carveout allocation Loic Pallardy
2017-12-14 5:34 ` Bjorn Andersson
2018-01-15 20:59 ` Loic PALLARDY
2017-11-30 16:46 ` [PATCH v2 15/16] remoteproc: st: associate memory device to memory regions Loic Pallardy
2017-12-14 5:37 ` Bjorn Andersson
2018-01-15 21:04 ` Loic PALLARDY
2017-11-30 16:46 ` [PATCH v2 16/16] rpmsg: virtio: allocate buffer from parent Loic Pallardy
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