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powerpc/powernv: Infrastructure to support OPAL async completion

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This patch adds support for notifying the clients of their request
completion. Clients request for the token before making OPAL call
and then wait for the response.

This patch uses messaging infrastructure to pull the data to linux
by registering itself for the message type OPAL_MSG_ASYNC_COMP.

Signed-off-by: Neelesh Gupta <neelegup@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Neelesh Gupta
2014-03-07 11:00:24 +05:30
committed by Benjamin Herrenschmidt
parent c7e64b9ce0
commit 8d72482322
3 changed files with 215 additions and 2 deletions
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12
arch/powerpc/include/asm/opal.h
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@@ -83,6 +83,8 @@ extern int opal_enter_rtas(struct rtas_args *args,
#define OPAL_INTERNAL_ERROR -11
#define OPAL_BUSY_EVENT -12
#define OPAL_HARDWARE_FROZEN -13
#define OPAL_WRONG_STATE -14
#define OPAL_ASYNC_COMPLETION -15
/* API Tokens (in r0) */
#define OPAL_CONSOLE_WRITE 1
@@ -253,7 +255,9 @@ enum OpalPendingState {
};
enum OpalMessageType {
OPAL_MSG_ASYNC_COMP = 0,
OPAL_MSG_ASYNC_COMP = 0, /* params[0] = token, params[1] = rc,
* additional params function-specific
*/
OPAL_MSG_MEM_ERR,
OPAL_MSG_EPOW,
OPAL_MSG_SHUTDOWN,
@@ -880,6 +884,12 @@ extern void opal_notifier_update_evt(uint64_t evt_mask, uint64_t evt_val);
extern int opal_get_chars(uint32_t vtermno, char *buf, int count);
extern int opal_put_chars(uint32_t vtermno, const char *buf, int total_len);
extern int __opal_async_get_token(void);
extern int opal_async_get_token_interruptible(void);
extern int __opal_async_release_token(int token);
extern int opal_async_release_token(int token);
extern int opal_async_wait_response(uint64_t token, struct opal_msg *msg);
extern void hvc_opal_init_early(void);
struct rtc_time;