Re: [PATCH 2/6] rpmsg: glink: smem: Wrap driver context
From: Chris Lew
Date: Wed Jan 25 2023 - 01:31:15 EST
On 1/9/2023 2:39 PM, Bjorn Andersson wrote:
The Glink SMEM driver allocates a struct device and hangs two
devres-allocated pipe objects thereon. To facilitate the move of
interrupt and mailbox handling to the driver, introduce a wrapper object
capturing the device, glink reference and remote processor id.
The type of the remoteproc reference is updated, as these are
specifically targetting the SMEM implementation.
s/targetting/targeting
Signed-off-by: Bjorn Andersson <quic_bjorande@xxxxxxxxxxx>
---
drivers/remoteproc/qcom_common.h | 3 +-
drivers/rpmsg/qcom_glink_smem.c | 76 ++++++++++++++++++++------------
include/linux/rpmsg/qcom_glink.h | 12 ++---
3 files changed, 55 insertions(+), 36 deletions(-)
diff --git a/drivers/remoteproc/qcom_common.h b/drivers/remoteproc/qcom_common.h
index c35adf730be0..2747c7d9ba44 100644
--- a/drivers/remoteproc/qcom_common.h
+++ b/drivers/remoteproc/qcom_common.h
@@ -6,6 +6,7 @@
#include "remoteproc_internal.h"
#include <linux/soc/qcom/qmi.h>
+struct qcom_glink_smem;
struct qcom_sysmon;
struct qcom_rproc_glink {
@@ -15,7 +16,7 @@ struct qcom_rproc_glink {
struct device *dev;
struct device_node *node;
- struct qcom_glink *edge;
+ struct qcom_glink_smem *edge;
};
struct qcom_rproc_subdev {
diff --git a/drivers/rpmsg/qcom_glink_smem.c b/drivers/rpmsg/qcom_glink_smem.c
index 579bc4443f6d..703e63fa5a86 100644
--- a/drivers/rpmsg/qcom_glink_smem.c
+++ b/drivers/rpmsg/qcom_glink_smem.c
@@ -33,6 +33,14 @@
#define SMEM_GLINK_NATIVE_XPRT_FIFO_0 479
#define SMEM_GLINK_NATIVE_XPRT_FIFO_1 480
+struct qcom_glink_smem {
+ struct device dev;
+
+ struct qcom_glink *glink;
+
+ u32 remote_pid;
+};
+
struct glink_smem_pipe {
struct qcom_glink_pipe native;
@@ -41,7 +49,7 @@ struct glink_smem_pipe {
void *fifo;
- int remote_pid;
+ struct qcom_glink_smem *smem;
};
#define to_smem_pipe(p) container_of(p, struct glink_smem_pipe, native)
@@ -49,13 +57,14 @@ struct glink_smem_pipe {
static size_t glink_smem_rx_avail(struct qcom_glink_pipe *np)
{
struct glink_smem_pipe *pipe = to_smem_pipe(np);
+ struct qcom_glink_smem *smem = pipe->smem;
size_t len;
void *fifo;
u32 head;
u32 tail;
if (!pipe->fifo) {
- fifo = qcom_smem_get(pipe->remote_pid,
+ fifo = qcom_smem_get(smem->remote_pid,
SMEM_GLINK_NATIVE_XPRT_FIFO_1, &len);
if (IS_ERR(fifo)) {
pr_err("failed to acquire RX fifo handle: %ld\n",
@@ -179,45 +188,49 @@ static void glink_smem_tx_write(struct qcom_glink_pipe *glink_pipe,
static void qcom_glink_smem_release(struct device *dev)
{
- kfree(dev);
+ struct qcom_glink_smem *smem = container_of(dev, struct qcom_glink_smem, dev);
+
+ kfree(smem);
}
-struct qcom_glink *qcom_glink_smem_register(struct device *parent,
- struct device_node *node)
+struct qcom_glink_smem *qcom_glink_smem_register(struct device *parent,
+ struct device_node *node)
{
struct glink_smem_pipe *rx_pipe;
struct glink_smem_pipe *tx_pipe;
struct qcom_glink *glink;
- struct device *dev;
+ struct qcom_glink_smem *smem;
I think we're following reverse christmas tree in this file
u32 remote_pid;
__le32 *descs;
size_t size;
int ret;
- dev = kzalloc(sizeof(*dev), GFP_KERNEL);
- if (!dev)
+ smem = kzalloc(sizeof(*smem), GFP_KERNEL);
+ if (!smem)
return ERR_PTR(-ENOMEM);
Would it be proper to keep a pointer to dev and avoid all the changes to
smem->dev use?
dev = &smem->dev;
- dev->parent = parent;
- dev->of_node = node;
- dev->release = qcom_glink_smem_release;
- dev_set_name(dev, "%s:%pOFn", dev_name(parent->parent), node);
- ret = device_register(dev);
+ smem->dev.parent = parent;
+ smem->dev.of_node = node;
+ smem->dev.release = qcom_glink_smem_release;
+ dev_set_name(&smem->dev, "%s:%pOFn", dev_name(parent->parent), node);
+ ret = device_register(&smem->dev);
if (ret) {
pr_err("failed to register glink edge\n");
- put_device(dev);
+ put_device(&smem->dev);
return ERR_PTR(ret);
}
- ret = of_property_read_u32(dev->of_node, "qcom,remote-pid",
+ ret = of_property_read_u32(smem->dev.of_node, "qcom,remote-pid",
&remote_pid);
if (ret) {
- dev_err(dev, "failed to parse qcom,remote-pid\n");
+ dev_err(&smem->dev, "failed to parse qcom,remote-pid\n");
goto err_put_dev;
}
- rx_pipe = devm_kzalloc(dev, sizeof(*rx_pipe), GFP_KERNEL);
- tx_pipe = devm_kzalloc(dev, sizeof(*tx_pipe), GFP_KERNEL);
+ smem->remote_pid = remote_pid;
+
+ rx_pipe = devm_kzalloc(&smem->dev, sizeof(*rx_pipe), GFP_KERNEL);
+ tx_pipe = devm_kzalloc(&smem->dev, sizeof(*tx_pipe), GFP_KERNEL);
if (!rx_pipe || !tx_pipe) {
ret = -ENOMEM;
goto err_put_dev;
@@ -226,20 +239,20 @@ struct qcom_glink *qcom_glink_smem_register(struct device *parent,
ret = qcom_smem_alloc(remote_pid,
SMEM_GLINK_NATIVE_XPRT_DESCRIPTOR, 32);
if (ret && ret != -EEXIST) {
- dev_err(dev, "failed to allocate glink descriptors\n");
+ dev_err(&smem->dev, "failed to allocate glink descriptors\n");
goto err_put_dev;
}
descs = qcom_smem_get(remote_pid,
SMEM_GLINK_NATIVE_XPRT_DESCRIPTOR, &size);
if (IS_ERR(descs)) {
- dev_err(dev, "failed to acquire xprt descriptor\n");
+ dev_err(&smem->dev, "failed to acquire xprt descriptor\n");
ret = PTR_ERR(descs);
goto err_put_dev;
}
if (size != 32) {
- dev_err(dev, "glink descriptor of invalid size\n");
+ dev_err(&smem->dev, "glink descriptor of invalid size\n");
ret = -EINVAL;
goto err_put_dev;
}
@@ -252,31 +265,31 @@ struct qcom_glink *qcom_glink_smem_register(struct device *parent,
ret = qcom_smem_alloc(remote_pid, SMEM_GLINK_NATIVE_XPRT_FIFO_0,
SZ_16K);
if (ret && ret != -EEXIST) {
- dev_err(dev, "failed to allocate TX fifo\n");
+ dev_err(&smem->dev, "failed to allocate TX fifo\n");
goto err_put_dev;
}
tx_pipe->fifo = qcom_smem_get(remote_pid, SMEM_GLINK_NATIVE_XPRT_FIFO_0,
&tx_pipe->native.length);
if (IS_ERR(tx_pipe->fifo)) {
- dev_err(dev, "failed to acquire TX fifo\n");
+ dev_err(&smem->dev, "failed to acquire TX fifo\n");
ret = PTR_ERR(tx_pipe->fifo);
goto err_put_dev;
}
+ rx_pipe->smem = smem;
rx_pipe->native.avail = glink_smem_rx_avail;
rx_pipe->native.peak = glink_smem_rx_peak;
rx_pipe->native.advance = glink_smem_rx_advance;
- rx_pipe->remote_pid = remote_pid;
+ tx_pipe->smem = smem;
tx_pipe->native.avail = glink_smem_tx_avail;
tx_pipe->native.write = glink_smem_tx_write;
- tx_pipe->remote_pid = remote_pid;
*rx_pipe->tail = 0;
*tx_pipe->head = 0;
- glink = qcom_glink_native_probe(dev,
+ glink = qcom_glink_native_probe(&smem->dev,
GLINK_FEATURE_INTENT_REUSE,
&rx_pipe->native, &tx_pipe->native,
false);
@@ -285,17 +298,22 @@ struct qcom_glink *qcom_glink_smem_register(struct device *parent,
goto err_put_dev;
}
- return glink;
+ smem->glink = glink;
+
+ return smem;
+
err_put_dev:
- device_unregister(dev);
+ device_unregister(&smem->dev);
return ERR_PTR(ret);
}
EXPORT_SYMBOL_GPL(qcom_glink_smem_register);
-void qcom_glink_smem_unregister(struct qcom_glink *glink)
+void qcom_glink_smem_unregister(struct qcom_glink_smem *smem)
{
+ struct qcom_glink *glink = smem->glink;
+
qcom_glink_native_remove(glink);
qcom_glink_native_unregister(glink);
}
diff --git a/include/linux/rpmsg/qcom_glink.h b/include/linux/rpmsg/qcom_glink.h
index 22fc3a69b683..bfbd48f435fa 100644
--- a/include/linux/rpmsg/qcom_glink.h
+++ b/include/linux/rpmsg/qcom_glink.h
@@ -5,7 +5,7 @@
#include <linux/device.h>
-struct qcom_glink;
+struct qcom_glink_smem;
#if IS_ENABLED(CONFIG_RPMSG_QCOM_GLINK)
void qcom_glink_ssr_notify(const char *ssr_name);
@@ -15,20 +15,20 @@ static inline void qcom_glink_ssr_notify(const char *ssr_name) {}
#if IS_ENABLED(CONFIG_RPMSG_QCOM_GLINK_SMEM)
-struct qcom_glink *qcom_glink_smem_register(struct device *parent,
- struct device_node *node);
-void qcom_glink_smem_unregister(struct qcom_glink *glink);
+struct qcom_glink_smem *qcom_glink_smem_register(struct device *parent,
+ struct device_node *node);
+void qcom_glink_smem_unregister(struct qcom_glink_smem *glink);
#else
-static inline struct qcom_glink *
+static inline struct qcom_glink_smem *
qcom_glink_smem_register(struct device *parent,
struct device_node *node)
{
return NULL;
}
-static inline void qcom_glink_smem_unregister(struct qcom_glink *glink) {}
+static inline void qcom_glink_smem_unregister(struct qcom_glink_smem *glink) {}
#endif
#endif