From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:34247) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1e2OhP-0003Td-LB for qemu-devel@nongnu.org; Wed, 11 Oct 2017 17:37:56 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1e2OhK-0003dU-PO for qemu-devel@nongnu.org; Wed, 11 Oct 2017 17:37:55 -0400 Received: from mx0b-001b2d01.pphosted.com ([148.163.158.5]:60622 helo=mx0a-001b2d01.pphosted.com) by eggs.gnu.org with esmtps (TLS1.0:RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1e2OhK-0003d7-KK for qemu-devel@nongnu.org; Wed, 11 Oct 2017 17:37:50 -0400 Received: from pps.filterd (m0098421.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.16.0.21/8.16.0.21) with SMTP id v9BLYYU0094282 for ; Wed, 11 Oct 2017 17:37:46 -0400 Received: from e13.ny.us.ibm.com (e13.ny.us.ibm.com [129.33.205.203]) by mx0a-001b2d01.pphosted.com with ESMTP id 2dhs4adrft-1 (version=TLSv1.2 cipher=AES256-SHA bits=256 verify=NOT) for ; Wed, 11 Oct 2017 17:37:46 -0400 Received: from localhost by e13.ny.us.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted for from ; Wed, 11 Oct 2017 17:37:45 -0400 From: Stefan Berger Date: Wed, 11 Oct 2017 17:37:29 -0400 In-Reply-To: <1507757851-12580-1-git-send-email-stefanb@linux.vnet.ibm.com> References: <1507757851-12580-1-git-send-email-stefanb@linux.vnet.ibm.com> Message-Id: <1507757851-12580-3-git-send-email-stefanb@linux.vnet.ibm.com> Subject: [Qemu-devel] [RFC PATCH 2/4] tpm: Introduce condition to notify waiters of completed command List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org Cc: amarnath.valluri@intel.com, marcandre.lureau@gmail.com, Stefan Berger Introduce a lock and a condition to notify anyone waiting for the completion of the execution of a TPM command by the backend (thread). The backend uses the condition to signal anyone waiting for command completion. We need to place the condition in two locations: one is invoked by the backend thread, the other by the bottom half thread. We will use the signalling to wait for command completion before VM suspend. Signed-off-by: Stefan Berger --- hw/tpm/tpm_int.h | 3 +++ hw/tpm/tpm_tis.c | 14 ++++++++++++++ 2 files changed, 17 insertions(+) diff --git a/hw/tpm/tpm_int.h b/hw/tpm/tpm_int.h index f2f285b..b766b3d 100644 --- a/hw/tpm/tpm_int.h +++ b/hw/tpm/tpm_int.h @@ -30,6 +30,9 @@ struct TPMState { char *backend; TPMBackend *be_driver; TPMVersion be_tpm_version; + + QemuMutex state_lock; + QemuCond cmd_complete; }; #define TPM(obj) OBJECT_CHECK(TPMState, (obj), TYPE_TPM_TIS) diff --git a/hw/tpm/tpm_tis.c b/hw/tpm/tpm_tis.c index 9bf0bce..b9b9a2f 100644 --- a/hw/tpm/tpm_tis.c +++ b/hw/tpm/tpm_tis.c @@ -367,6 +367,8 @@ static void tpm_tis_receive_bh(void *opaque) TPMTISEmuState *tis = &s->s.tis; uint8_t locty = s->locty_number; + qemu_mutex_lock(&s->state_lock); + tpm_tis_sts_set(&tis->loc[locty], TPM_TIS_STS_VALID | TPM_TIS_STS_DATA_AVAILABLE); tis->loc[locty].state = TPM_TIS_STATE_COMPLETION; @@ -385,6 +387,10 @@ static void tpm_tis_receive_bh(void *opaque) tpm_tis_raise_irq(s, locty, TPM_TIS_INT_DATA_AVAILABLE | TPM_TIS_INT_STS_VALID); #endif + + /* notify of completed command */ + qemu_cond_signal(&s->cmd_complete); + qemu_mutex_unlock(&s->state_lock); } /* @@ -404,6 +410,11 @@ static void tpm_tis_receive_cb(TPMState *s, uint8_t locty, } } + qemu_mutex_lock(&s->state_lock); + /* notify of completed command */ + qemu_cond_signal(&s->cmd_complete); + qemu_mutex_unlock(&s->state_lock); + qemu_bh_schedule(tis->bh); } @@ -1083,6 +1094,9 @@ static void tpm_tis_initfn(Object *obj) memory_region_init_io(&s->mmio, OBJECT(s), &tpm_tis_memory_ops, s, "tpm-tis-mmio", TPM_TIS_NUM_LOCALITIES << TPM_TIS_LOCALITY_SHIFT); + + qemu_mutex_init(&s->state_lock); + qemu_cond_init(&s->cmd_complete); } static void tpm_tis_class_init(ObjectClass *klass, void *data) -- 2.5.5