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update locking notes of opencrypto(9)

This commit is contained in:
knakahara 2017-07-26 06:44:50 +00:00
parent b608202910
commit 41820201a7
1 changed files with 10 additions and 5 deletions
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15
sys/opencrypto/cryptodev.h
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@ -1,4 +1,4 @@
/* $NetBSD: cryptodev.h,v 1.38 2017/07/18 06:01:36 knakahara Exp $ */
/* $NetBSD: cryptodev.h,v 1.39 2017/07/26 06:44:50 knakahara Exp $ */
/* $FreeBSD: src/sys/opencrypto/cryptodev.h,v 1.2.2.6 2003/07/02 17:04:50 sam Exp $ */
/* $OpenBSD: cryptodev.h,v 1.33 2002/07/17 23:52:39 art Exp $ */
@ -670,12 +670,17 @@ extern int cuio_getptr(struct uio *, int loc, int *off);
* + crypto_drivers[i] and its all members are protected by
* crypto_drivers[i].cc_lock (a spin lock)
* spin lock as crypto_unblock() can be called in interrupt context
* + crp_q and crp_kq are procted by crypto_q_mtx (an adaptive lock)
* + crp_ret_q, crp_ret_kq and crypto_exit_flag are protected by
* crypto_ret_q_mtx (a spin lock)
* + percpu'ed crp_q and crp_kq are procted by splsoftnet.
* + crp_ret_q, crp_ret_kq and crypto_exit_flag that are members of
* struct crypto_crp_ret_qs are protected by crypto_crp_ret_qs.crp_ret_q_mtx
* (a spin lock)
* spin lock as crypto_done() can be called in interrupt context
* NOTE:
* It is not known whether crypto_done()(in interrupt context) is called
* in the same CPU as crypto_dispatch() is called.
* So, struct crypto_crp_ret_qs cannot be percpu(9).
*
* Locking order:
* - crypto_q_mtx => crypto_drv_mtx => crypto_drivers[i].cc_lock
* - crypto_drv_mtx => crypto_drivers[i].cc_lock
*/
#endif /* _CRYPTO_CRYPTO_H_ */