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Date: Wed, 30 Sep 2020 13:53:48 +0200
From: Alexandre Bailon <abailon@...libre.com>
To: linux-remoteproc@...r.kernel.org
Cc: ohad@...ery.com, bjorn.andersson@...aro.org,
sumit.semwal@...aro.org, christian.koenig@....com,
linux-kernel@...r.kernel.org, linux-media@...r.kernel.org,
dri-devel@...ts.freedesktop.org, linaro-mm-sig@...ts.linaro.org,
jstephan@...libre.com, stephane.leprovost@...iatek.com,
gpain@...libre.com, mturquette@...libre.com,
Alexandre Bailon <abailon@...libre.com>
Subject: [RFC PATCH 2/4] rpmsg: apu_rpmsg: Add support for async apu request
From: Julien STEPHAN <jstephan@...libre.com>
In order to improve performances and flexibility,
add support of async request.
Signed-off-by: Julien STEPHAN <jstephan@...libre.com>
Signed-off-by: Alexandre Bailon <abailon@...libre.com>
---
drivers/rpmsg/apu_rpmsg.c | 208 ++++++++++++++++++++++-----------
include/uapi/linux/apu_rpmsg.h | 6 +-
2 files changed, 144 insertions(+), 70 deletions(-)
diff --git a/drivers/rpmsg/apu_rpmsg.c b/drivers/rpmsg/apu_rpmsg.c
index 5131b8b8e1f2..e14597c467d7 100644
--- a/drivers/rpmsg/apu_rpmsg.c
+++ b/drivers/rpmsg/apu_rpmsg.c
@@ -34,11 +34,16 @@ struct rpmsg_apu {
struct iommu_domain *domain;
struct iova_domain *iovad;
int iova_limit_pfn;
+ wait_queue_head_t waitqueue;
+ u8 available_response;
+ spinlock_t ctx_lock;
+ struct list_head requests;
};
struct rpmsg_request {
- struct completion completion;
+ u8 ready;
struct list_head node;
+ struct apu_buffer *buffer;
void *req;
};
@@ -68,25 +73,35 @@ static dev_t rpmsg_major;
static DEFINE_IDA(rpmsg_ctrl_ida);
static DEFINE_IDA(rpmsg_minor_ida);
static DEFINE_IDA(req_ida);
-static LIST_HEAD(requests);
static struct apu_iova_domain *apu_iovad;
-static int apu_rpmsg_callback(struct rpmsg_device *dev, void *data, int count,
+
+static int apu_rpmsg_callback(struct rpmsg_device *rpdev, void *data, int count,
void *priv, u32 addr)
{
+ struct rpmsg_apu *apu = dev_get_drvdata(&rpdev->dev);
struct rpmsg_request *rpmsg_req;
struct apu_dev_request *hdr = data;
+ unsigned long flags;
- list_for_each_entry(rpmsg_req, &requests, node) {
- struct apu_dev_request *tmp_hdr = rpmsg_req->req;
+ spin_lock_irqsave(&apu->ctx_lock, flags);
+ list_for_each_entry(rpmsg_req, &apu->requests, node) {
+ struct apu_request *tmp_hdr = rpmsg_req->req;
if (hdr->id == tmp_hdr->id) {
- memcpy(rpmsg_req->req, data, count);
- complete(&rpmsg_req->completion);
-
- return 0;
+ rpmsg_req->ready = 1;
+ apu->available_response++;
+ tmp_hdr->result = hdr->result;
+ tmp_hdr->size_in = hdr->size_in;
+ tmp_hdr->size_out = hdr->size_out;
+ memcpy(tmp_hdr->data, hdr->data,
+ hdr->size_in+hdr->size_out);
+
+ wake_up_interruptible(&apu->waitqueue);
+ break;
}
}
+ spin_unlock_irqrestore(&apu->ctx_lock, flags);
return 0;
}
@@ -177,48 +192,6 @@ static void apu_device_memory_unmap(struct rpmsg_apu *apu,
dma_buf_put(buffer->dma_buf);
}
-static int _apu_send_request(struct rpmsg_apu *apu,
- struct rpmsg_device *rpdev,
- struct apu_dev_request *req, int len)
-{
-
- struct rpmsg_request *rpmsg_req;
- int ret = 0;
-
- req->id = ida_simple_get(&req_ida, 0, 0xffff, GFP_KERNEL);
- if (req->id < 0)
- return ret;
-
- rpmsg_req = kzalloc(sizeof(*rpmsg_req), GFP_KERNEL);
- if (!rpmsg_req)
- return -ENOMEM;
-
- rpmsg_req->req = req;
- init_completion(&rpmsg_req->completion);
- list_add(&rpmsg_req->node, &requests);
-
- ret = rpmsg_send(rpdev->ept, req, len);
- if (ret)
- goto free_req;
-
- /* be careful with race here between timeout and callback*/
- ret = wait_for_completion_timeout(&rpmsg_req->completion,
- msecs_to_jiffies(1000));
- if (!ret)
- ret = -ETIMEDOUT;
- else
- ret = 0;
-
- ida_simple_remove(&req_ida, req->id);
-
-free_req:
-
- list_del(&rpmsg_req->node);
- kfree(rpmsg_req);
-
- return ret;
-}
-
static int apu_send_request(struct rpmsg_apu *apu,
struct apu_request *req)
{
@@ -226,6 +199,8 @@ static int apu_send_request(struct rpmsg_apu *apu,
struct rpmsg_device *rpdev = apu->rpdev;
struct apu_dev_request *dev_req;
struct apu_buffer *buffer;
+ struct rpmsg_request *rpmsg_req;
+ unsigned long flags;
int size = req->size_in + req->size_out +
sizeof(u32) * req->count * 2 + sizeof(*dev_req);
@@ -257,24 +232,63 @@ static int apu_send_request(struct rpmsg_apu *apu,
dev_req_buffer_size[i] = buffer_size[i];
}
- ret = _apu_send_request(apu, rpdev, dev_req, size);
+ ret = ida_simple_get(&req_ida, 0, 0xffff, GFP_KERNEL);
+ if (ret < 0)
+ goto err_free_memory;
+
+ dev_req->id = ret;
+
+ rpmsg_req = kzalloc(sizeof(*rpmsg_req), GFP_KERNEL);
+ if (!rpmsg_req) {
+ ret = -ENOMEM;
+ goto err_ida_remove;
+ }
+ req->id = dev_req->id;
+ rpmsg_req->req = req;
+ rpmsg_req->buffer = buffer;
+ spin_lock_irqsave(&apu->ctx_lock, flags);
+ list_add(&rpmsg_req->node, &apu->requests);
+ spin_unlock_irqrestore(&apu->ctx_lock, flags);
+
+ ret = rpmsg_send(rpdev->ept, dev_req, size);
+ if (ret < 0)
+ goto err;
+
+ kfree(dev_req);
+
+ return req->id;
+
+err:
+ list_del(&rpmsg_req->node);
+ kfree(rpmsg_req);
+ kfree(req);
+err_ida_remove:
+ ida_simple_remove(&req_ida, dev_req->id);
err_free_memory:
for (i--; i >= 0; i--)
apu_device_memory_unmap(apu, &buffer[i]);
- req->result = dev_req->result;
- req->size_in = dev_req->size_in;
- req->size_out = dev_req->size_out;
- memcpy(req->data, dev_req->data, dev_req->size_in + dev_req->size_out +
- sizeof(u32) * req->count);
-
kfree(buffer);
kfree(dev_req);
return ret;
}
+unsigned int rpmsg_eptdev_poll(struct file *fp, struct poll_table_struct *wait)
+{
+ struct rpmsg_apu *apu = fp->private_data;
+ unsigned long flags;
+
+ poll_wait(fp, &apu->waitqueue, wait);
+ spin_lock_irqsave(&apu->ctx_lock, flags);
+ if (apu->available_response) {
+ spin_unlock_irqrestore(&apu->ctx_lock, flags);
+ return POLLIN;
+ }
+ spin_unlock_irqrestore(&apu->ctx_lock, flags);
+ return 0;
+}
static long rpmsg_eptdev_ioctl(struct file *fp, unsigned int cmd,
unsigned long arg)
@@ -285,6 +299,11 @@ static long rpmsg_eptdev_ioctl(struct file *fp, unsigned int cmd,
void __user *argp = (void __user *)arg;
int len;
int ret;
+ unsigned long flags;
+ struct rpmsg_request *rpmsg_req;
+ int i;
+
+ ret = 0;
switch (cmd) {
case APU_SEND_REQ_IOCTL:
@@ -306,24 +325,69 @@ static long rpmsg_eptdev_ioctl(struct file *fp, unsigned int cmd,
}
ret = apu_send_request(apu, apu_req_full);
- if (ret) {
- kfree(apu_req_full);
- return ret;
+
+ break;
+ case APU_GET_NEXT_AVAILABLE_IOCTL:
+ ret = -ENOMSG;
+ spin_lock_irqsave(&apu->ctx_lock, flags);
+ list_for_each_entry(rpmsg_req, &apu->requests, node) {
+ if (rpmsg_req->ready == 1) {
+ struct apu_request *req =
+ rpmsg_req->req;
+
+ ret = 0;
+ if (copy_to_user(argp, &req->id, sizeof(__u16)))
+ ret = -EFAULT;
+ break;
+ }
}
+ spin_unlock_irqrestore(&apu->ctx_lock, flags);
+ break;
+ case APU_GET_RESP:
+ /* Get the header */
+ if (!argp)
+ return -EINVAL;
- if (copy_to_user(argp, apu_req_full, sizeof(apu_req) +
- sizeof(u32) * apu_req_full->count +
- apu_req_full->size_in + apu_req_full->size_out))
- ret = -EFAULT;
+ if (copy_from_user(&apu_req, argp,
+ sizeof(apu_req)))
+ return -EFAULT;
- kfree(apu_req_full);
- return ret;
+ spin_lock_irqsave(&apu->ctx_lock, flags);
+ list_for_each_entry(rpmsg_req, &apu->requests, node) {
+ struct apu_request *req = rpmsg_req->req;
+
+ if ((apu_req.id == req->id) &&
+ (rpmsg_req->ready == 1)) {
+ int req_len = sizeof(struct apu_request) +
+ req->size_in + req->size_out +
+ req->count * sizeof(u32)*2;
+ int apu_req_len = sizeof(struct apu_request) +
+ req->size_in + req->size_out +
+ req->count * sizeof(u32)*2;
+
+ len = min(req_len, apu_req_len);
+ if (copy_to_user(argp, req, len))
+ ret = -EFAULT;
+ apu->available_response--;
+ ida_simple_remove(&req_ida, req->id);
+ for (i = 0; i < req->count ; i++)
+ apu_device_memory_unmap(apu,
+ &rpmsg_req->buffer[i]);
+ list_del(&rpmsg_req->node);
+ kfree(rpmsg_req->buffer);
+ kfree(rpmsg_req->req);
+ kfree(rpmsg_req);
+ break;
+ }
+ }
+ spin_unlock_irqrestore(&apu->ctx_lock, flags);
+ break;
default:
- return -EINVAL;
+ ret = -EINVAL;
}
- return 0;
+ return ret;
}
static int rpmsg_eptdev_open(struct inode *inode, struct file *filp)
@@ -351,6 +415,7 @@ static const struct file_operations rpmsg_eptdev_fops = {
.release = rpmsg_eptdev_release,
.unlocked_ioctl = rpmsg_eptdev_ioctl,
.compat_ioctl = rpmsg_eptdev_ioctl,
+ .poll = rpmsg_eptdev_poll,
};
static void iova_domain_release(struct kref *ref)
@@ -512,6 +577,11 @@ static int apu_rpmsg_probe(struct rpmsg_device *rpdev)
dev->id = ret;
dev_set_name(&apu->dev, "apu%d", ret);
+ init_waitqueue_head(&apu->waitqueue);
+ spin_lock_init(&apu->ctx_lock);
+ apu->available_response = 0;
+ INIT_LIST_HEAD(&apu->requests);
+
ret = cdev_add(&apu->cdev, dev->devt, 1);
if (ret)
goto free_ctrl_ida;
diff --git a/include/uapi/linux/apu_rpmsg.h b/include/uapi/linux/apu_rpmsg.h
index 81c9e4af9a94..f61207520254 100644
--- a/include/uapi/linux/apu_rpmsg.h
+++ b/include/uapi/linux/apu_rpmsg.h
@@ -21,6 +21,7 @@
* by the APU.
*/
struct apu_request {
+ __u16 id;
__u16 cmd;
__u16 result;
__u16 size_in;
@@ -31,6 +32,9 @@ struct apu_request {
};
/* Send synchronous request to an APU */
-#define APU_SEND_REQ_IOCTL _IOWR(0xb7, 0x2, struct apu_request)
+
+#define APU_SEND_REQ_IOCTL _IOW(0xb7, 0x2, struct apu_request)
+#define APU_GET_NEXT_AVAILABLE_IOCTL _IOR(0xb7, 0x3, __u16)
+#define APU_GET_RESP _IOWR(0xb7, 0x4, struct apu_request)
#endif
--
2.26.2
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