From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mx0a-001b2d01.pphosted.com (mx0b-001b2d01.pphosted.com [148.163.158.5]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 3wnHXD2k62zDqL5 for ; Wed, 14 Jun 2017 03:57:00 +1000 (AEST) Received: from pps.filterd (m0098419.ppops.net [127.0.0.1]) by mx0b-001b2d01.pphosted.com (8.16.0.20/8.16.0.20) with SMTP id v5DHrvi1020013 for ; Tue, 13 Jun 2017 13:56:57 -0400 Received: from e23smtp08.au.ibm.com (e23smtp08.au.ibm.com [202.81.31.141]) by mx0b-001b2d01.pphosted.com with ESMTP id 2b2ksrk4ve-1 (version=TLSv1.2 cipher=AES256-SHA bits=256 verify=NOT) for ; Tue, 13 Jun 2017 13:56:57 -0400 Received: from localhost by e23smtp08.au.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted for from ; Wed, 14 Jun 2017 03:56:54 +1000 Received: from d23av03.au.ibm.com (d23av03.au.ibm.com [9.190.234.97]) by d23relay08.au.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id v5DHuqmp2949504 for ; Wed, 14 Jun 2017 03:56:52 +1000 Received: from d23av03.au.ibm.com (localhost [127.0.0.1]) by d23av03.au.ibm.com (8.14.4/8.14.4/NCO v10.0 AVout) with ESMTP id v5DHuhPT001263 for ; Wed, 14 Jun 2017 03:56:44 +1000 From: Shilpasri G Bhat To: linuxppc-dev@lists.ozlabs.org, cyrilbur@gmail.com Cc: linux-kernel@vger.kernel.org, benh@kernel.crashing.org, paulus@samba.org, mpe@ellerman.id.au, svaidy@linux.vnet.ibm.com, ego@linux.vnet.ibm.com, Shilpasri G Bhat Subject: [PATCH V2 1/2] powerpc/powernv: Get a unique token for async completions Date: Tue, 13 Jun 2017 23:26:40 +0530 In-Reply-To: <1497376601-23604-1-git-send-email-shilpa.bhat@linux.vnet.ibm.com> References: <1497376601-23604-1-git-send-email-shilpa.bhat@linux.vnet.ibm.com> Message-Id: <1497376601-23604-2-git-send-email-shilpa.bhat@linux.vnet.ibm.com> List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , This patch adds support to get a unique token for async completion requests. This will be used for creating non-repititive request handles for consecutive requests in OPAL-OCC command/response interface. Signed-off-by: Shilpasri G Bhat --- No changes from V1 arch/powerpc/include/asm/opal.h | 1 + arch/powerpc/platforms/powernv/opal-async.c | 46 +++++++++++++++++++++++++++++ 2 files changed, 47 insertions(+) diff --git a/arch/powerpc/include/asm/opal.h b/arch/powerpc/include/asm/opal.h index 588fb1c..03ed493 100644 --- a/arch/powerpc/include/asm/opal.h +++ b/arch/powerpc/include/asm/opal.h @@ -293,6 +293,7 @@ extern int opal_message_notifier_unregister(enum opal_msg_type msg_type, extern int __opal_async_get_token(void); extern int opal_async_get_token_interruptible(void); +extern int opal_async_get_unique_token_interruptible(int last_token); 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); diff --git a/arch/powerpc/platforms/powernv/opal-async.c b/arch/powerpc/platforms/powernv/opal-async.c index 83bebee..8caeea2 100644 --- a/arch/powerpc/platforms/powernv/opal-async.c +++ b/arch/powerpc/platforms/powernv/opal-async.c @@ -73,6 +73,52 @@ int opal_async_get_token_interruptible(void) } EXPORT_SYMBOL_GPL(opal_async_get_token_interruptible); +static int __opal_async_get_new_token(int last_token) +{ + unsigned long flags; + int token; + + spin_lock_irqsave(&opal_async_comp_lock, flags); + token = find_next_bit(opal_async_complete_map, opal_max_async_tokens, + last_token + 1); + if (token >= opal_max_async_tokens) { + token = find_first_bit(opal_async_complete_map, + opal_max_async_tokens); + if (token >= opal_max_async_tokens || token == last_token) { + token = -EBUSY; + goto out; + } + } + + pr_debug("%s token = %d\n", __func__, token); + if (__test_and_set_bit(token, opal_async_token_map)) { + token = -EBUSY; + goto out; + } + + __clear_bit(token, opal_async_complete_map); + +out: + spin_unlock_irqrestore(&opal_async_comp_lock, flags); + return token; +} + +int opal_async_get_unique_token_interruptible(int last_token) +{ + int token; + + /* Wait until a token is available */ + if (down_interruptible(&opal_async_sem)) + return -ERESTARTSYS; + + token = __opal_async_get_new_token(last_token); + if (token < 0) + up(&opal_async_sem); + + return token; +} +EXPORT_SYMBOL_GPL(opal_async_get_unique_token_interruptible); + int __opal_async_release_token(int token) { unsigned long flags; -- 1.8.3.1