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powerpc/powernv: Fix issues in opal_async

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* Properly return the full opal_msg from an async completion.
* Don't keep bugging OPAL, wait 100us or so.  With some minor changes to
  DELAY() to drop to very low priority, the thread won't hog the CPU while
  polling for the async completion.
This commit is contained in:
Justin Hibbits 2019-04-06 02:31:01 +00:00
parent 734b726d80
commit 947079ebee
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=345974
2 changed files with 14 additions and 9 deletions
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2
sys/powerpc/powernv/opal.h
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@ -201,7 +201,7 @@ struct opal_ipmi_msg {
int opal_init_async_tokens(int);
int opal_alloc_async_token(void);
void opal_free_async_token(int);
int opal_wait_completion(void *, uint64_t, uint64_t);
int opal_wait_completion(void *, uint64_t, int);
typedef void (*opal_msg_handler_fn)(void *, struct opal_msg *);
EVENTHANDLER_DECLARE(OPAL_ASYNC_COMP, opal_msg_handler_fn);

21
sys/powerpc/powernv/opal_async.c
View File

@ -50,8 +50,8 @@ static vmem_t *async_token_pool;
static void opal_handle_async_completion(void *, struct opal_msg *);
struct async_completion {
uint64_t rval;
bool completed;
volatile uint64_t completed;
struct opal_msg msg;
};
struct async_completion *completions;
@ -98,16 +98,21 @@ opal_free_async_token(int token)
* of the operation, error if it returns early.
*/
int
opal_wait_completion(void *buf, uint64_t size, uint64_t token)
opal_wait_completion(void *buf, uint64_t size, int token)
{
int err;
do {
err = opal_call(OPAL_CHECK_ASYNC_COMPLETION,
vtophys(buf), size, token);
if (err == OPAL_BUSY)
if (completions[token].completed)
return (completions[token].rval);
if (err == OPAL_BUSY) {
if (completions[token].completed) {
atomic_thread_fence_acq();
memcpy(buf, &completions[token].msg, size);
return (OPAL_SUCCESS);
}
}
DELAY(100);
} while (err == OPAL_BUSY);
return (err);
@ -118,7 +123,7 @@ static void opal_handle_async_completion(void *arg, struct opal_msg *msg)
int token;
token = msg->params[0];
completions[token].rval = msg->params[1];
isync();
memcpy(&completions[token].msg, msg, sizeof(*msg));
atomic_thread_fence_rel();
completions[token].completed = true;
}