From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from ozlabs.org (bilbo.ozlabs.org [103.22.144.67]) (using TLSv1.2 with cipher ADH-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 3xRqmj75ZGzDqr6 for ; Wed, 9 Aug 2017 09:07:33 +1000 (AEST) Received: from ozlabs.org (bilbo.ozlabs.org [103.22.144.67]) by bilbo.ozlabs.org (Postfix) with ESMTP id 3xRqmj28CNz8vqD for ; Wed, 9 Aug 2017 09:07:33 +1000 (AEST) 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 ozlabs.org (Postfix) with ESMTPS id 3xRqmh0Qspz9s7F for ; Wed, 9 Aug 2017 09:07:31 +1000 (AEST) Received: from pps.filterd (m0098413.ppops.net [127.0.0.1]) by mx0b-001b2d01.pphosted.com (8.16.0.21/8.16.0.21) with SMTP id v78N4Mbm048262 for ; Tue, 8 Aug 2017 19:07:30 -0400 Received: from e11.ny.us.ibm.com (e11.ny.us.ibm.com [129.33.205.201]) by mx0b-001b2d01.pphosted.com with ESMTP id 2c7mnqd6jy-1 (version=TLSv1.2 cipher=AES256-SHA bits=256 verify=NOT) for ; Tue, 08 Aug 2017 19:07:29 -0400 Received: from localhost by e11.ny.us.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted for from ; Tue, 8 Aug 2017 19:07:29 -0400 From: Sukadev Bhattiprolu To: Michael Ellerman Cc: Benjamin Herrenschmidt , mikey@neuling.org, stewart@linux.vnet.ibm.com, apopple@au1.ibm.com, hbabu@us.ibm.com, oohall@gmail.com, linuxppc-dev@ozlabs.org, Subject: [PATCH v6 08/17] powerpc/vas: Define vas_win_id() Date: Tue, 8 Aug 2017 16:06:53 -0700 In-Reply-To: <1502233622-9330-1-git-send-email-sukadev@linux.vnet.ibm.com> References: <1502233622-9330-1-git-send-email-sukadev@linux.vnet.ibm.com> Message-Id: <1502233622-9330-9-git-send-email-sukadev@linux.vnet.ibm.com> List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Define an interface to return a system-wide unique id for a given VAS window. The vas_win_id() will be used in a follow-on patch to generate an unique handle for a user space receive window. Applications can use this handle to pair send and receive windows for fast thread-wakeup. The hardware refers to this system-wide unique id as a Partition Send Window ID which is expected to be used during fault handling. Hence the "pswid" in the function names. Signed-off-by: Sukadev Bhattiprolu --- arch/powerpc/include/asm/vas.h | 5 +++++ arch/powerpc/platforms/powernv/vas-window.c | 9 +++++++++ arch/powerpc/platforms/powernv/vas.h | 28 ++++++++++++++++++++++++++++ 3 files changed, 42 insertions(+) diff --git a/arch/powerpc/include/asm/vas.h b/arch/powerpc/include/asm/vas.h index 2b35b95..30667db 100644 --- a/arch/powerpc/include/asm/vas.h +++ b/arch/powerpc/include/asm/vas.h @@ -35,6 +35,11 @@ enum vas_cop_type { }; /* + * Return a system-wide unique id for the VAS window @win. + */ +extern uint32_t vas_win_id(struct vas_window *win); + +/* * Return the power bus paste address associated with @win so the caller * can map that address into their address space. */ diff --git a/arch/powerpc/platforms/powernv/vas-window.c b/arch/powerpc/platforms/powernv/vas-window.c index 3a4599f..42c1d4f 100644 --- a/arch/powerpc/platforms/powernv/vas-window.c +++ b/arch/powerpc/platforms/powernv/vas-window.c @@ -575,3 +575,12 @@ int vas_win_close(struct vas_window *window) { return -1; } + +/* + * Return a system-wide unique window id for the window @win. + */ +uint32_t vas_win_id(struct vas_window *win) +{ + return encode_pswid(win->vinst->vas_id, win->winid); +} +EXPORT_SYMBOL_GPL(vas_win_id); diff --git a/arch/powerpc/platforms/powernv/vas.h b/arch/powerpc/platforms/powernv/vas.h index 7b2bcd0..3eadf90 100644 --- a/arch/powerpc/platforms/powernv/vas.h +++ b/arch/powerpc/platforms/powernv/vas.h @@ -440,4 +440,32 @@ static inline uint64_t read_hvwc_reg(struct vas_window *win, return in_be64(win->hvwc_map+reg); } +/* + * Encode/decode the Partition Send Window ID (PSWID) for a window in + * a way that we can uniquely identify any window in the system. i.e. + * we should be able to locate the 'struct vas_window' given the PSWID. + * + * Bits Usage + * 0:7 VAS id (8 bits) + * 8:15 Unused, 0 (3 bits) + * 16:31 Window id (16 bits) + */ +static inline u32 encode_pswid(int vasid, int winid) +{ + u32 pswid = 0; + + pswid |= vasid << (31 - 7); + pswid |= winid; + + return pswid; +} + +static inline void decode_pswid(u32 pswid, int *vasid, int *winid) +{ + if (vasid) + *vasid = pswid >> (31 - 7) & 0xFF; + + if (winid) + *winid = pswid & 0xFFFF; +} #endif /* _VAS_H */ -- 2.7.4