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Date: Wed, 25 Jan 2023 21:02:58 +0900
From: Takashi Sakamoto <o-takashi@...amocchi.jp>
To: stefanr@...6.in-berlin.de
Cc: linux1394-devel@...ts.sourceforge.net,
linux-kernel@...r.kernel.org, tiwai@...e.de
Subject: [PATCH 08/11] firewire: cdev: implement new event to notify response subaction with time stamp
The callback function now receives an argument for time stamps relevant
to asynchronous transaction. This commit implements a new event to
notify response subaction with the time stamps for user space.
Signed-off-by: Takashi Sakamoto <o-takashi@...amocchi.jp>
---
drivers/firewire/core-cdev.c | 96 ++++++++++++++++++++++++------------
1 file changed, 65 insertions(+), 31 deletions(-)
diff --git a/drivers/firewire/core-cdev.c b/drivers/firewire/core-cdev.c
index 315ebc8c545d..8b24abdd51b8 100644
--- a/drivers/firewire/core-cdev.c
+++ b/drivers/firewire/core-cdev.c
@@ -172,6 +172,7 @@ struct outbound_transaction_event {
struct outbound_transaction_resource r;
union {
struct fw_cdev_event_response without_tstamp;
+ struct fw_cdev_event_response2 with_tstamp;
} rsp;
};
@@ -538,41 +539,64 @@ static void release_transaction(struct client *client,
{
}
-static void complete_transaction(struct fw_card *card, int rcode,
- void *payload, size_t length, void *data)
+static void complete_transaction(struct fw_card *card, int rcode, u32 request_tstamp,
+ u32 response_tstamp, void *payload, size_t length, void *data)
{
struct outbound_transaction_event *e = data;
- struct fw_cdev_event_response *rsp = &e->rsp.without_tstamp;
struct client *client = e->client;
unsigned long flags;
- if (length < rsp->length)
- rsp->length = length;
- if (rcode == RCODE_COMPLETE)
- memcpy(rsp->data, payload, rsp->length);
-
spin_lock_irqsave(&client->lock, flags);
idr_remove(&client->resource_idr, e->r.resource.handle);
if (client->in_shutdown)
wake_up(&client->tx_flush_wait);
spin_unlock_irqrestore(&client->lock, flags);
- rsp->type = FW_CDEV_EVENT_RESPONSE;
- rsp->rcode = rcode;
+ switch (e->rsp.without_tstamp.type) {
+ case FW_CDEV_EVENT_RESPONSE:
+ {
+ struct fw_cdev_event_response *rsp = &e->rsp.without_tstamp;
+
+ if (length < rsp->length)
+ rsp->length = length;
+ if (rcode == RCODE_COMPLETE)
+ memcpy(rsp->data, payload, rsp->length);
+
+ rsp->rcode = rcode;
+
+ // In the case that sizeof(*rsp) doesn't align with the position of the
+ // data, and the read is short, preserve an extra copy of the data
+ // to stay compatible with a pre-2.6.27 bug. Since the bug is harmless
+ // for short reads and some apps depended on it, this is both safe
+ // and prudent for compatibility.
+ if (rsp->length <= sizeof(*rsp) - offsetof(typeof(*rsp), data))
+ queue_event(client, &e->event, rsp, sizeof(*rsp), rsp->data, rsp->length);
+ else
+ queue_event(client, &e->event, rsp, sizeof(*rsp) + rsp->length, NULL, 0);
- /*
- * In the case that sizeof(*rsp) doesn't align with the position of the
- * data, and the read is short, preserve an extra copy of the data
- * to stay compatible with a pre-2.6.27 bug. Since the bug is harmless
- * for short reads and some apps depended on it, this is both safe
- * and prudent for compatibility.
- */
- if (rsp->length <= sizeof(*rsp) - offsetof(typeof(*rsp), data))
- queue_event(client, &e->event, rsp, sizeof(*rsp),
- rsp->data, rsp->length);
- else
- queue_event(client, &e->event, rsp, sizeof(*rsp) + rsp->length,
- NULL, 0);
+ break;
+ }
+ case FW_CDEV_EVENT_RESPONSE2:
+ {
+ struct fw_cdev_event_response2 *rsp = &e->rsp.with_tstamp;
+
+ if (length < rsp->length)
+ rsp->length = length;
+ if (rcode == RCODE_COMPLETE)
+ memcpy(rsp->data, payload, rsp->length);
+
+ rsp->rcode = rcode;
+ rsp->request_tstamp = request_tstamp;
+ rsp->response_tstamp = response_tstamp;
+
+ queue_event(client, &e->event, rsp, sizeof(*rsp) + rsp->length, NULL, 0);
+
+ break;
+ default:
+ WARN_ON(1);
+ break;
+ }
+ }
/* Drop the idr's reference */
client_put(client);
@@ -583,7 +607,6 @@ static int init_request(struct client *client,
int destination_id, int speed)
{
struct outbound_transaction_event *e;
- struct fw_cdev_event_response *rsp;
void *payload;
int ret;
@@ -600,10 +623,21 @@ static int init_request(struct client *client,
return -ENOMEM;
e->client = client;
- rsp = &e->rsp.without_tstamp;
- rsp->length = request->length;
- rsp->closure = request->closure;
- payload = rsp->data;
+ if (client->version < FW_CDEV_VERSION_EVENT_ASYNC_TSTAMP) {
+ struct fw_cdev_event_response *rsp = &e->rsp.without_tstamp;
+
+ rsp->type = FW_CDEV_EVENT_RESPONSE;
+ rsp->length = request->length;
+ rsp->closure = request->closure;
+ payload = rsp->data;
+ } else {
+ struct fw_cdev_event_response2 *rsp = &e->rsp.with_tstamp;
+
+ rsp->type = FW_CDEV_EVENT_RESPONSE2;
+ rsp->length = request->length;
+ rsp->closure = request->closure;
+ payload = rsp->data;
+ }
if (request->data && copy_from_user(payload, u64_to_uptr(request->data), request->length)) {
ret = -EFAULT;
@@ -615,9 +649,9 @@ static int init_request(struct client *client,
if (ret < 0)
goto failed;
- fw_send_request(client->device->card, &e->r.transaction, request->tcode, destination_id,
- request->generation, speed, request->offset, payload, request->length,
- complete_transaction, e);
+ fw_send_request_with_tstamp(client->device->card, &e->r.transaction, request->tcode,
+ destination_id, request->generation, speed, request->offset,
+ payload, request->length, complete_transaction, e);
return 0;
failed:
--
2.37.2
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