Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751705AbdHXGip (ORCPT ); Thu, 24 Aug 2017 02:38:45 -0400 Received: from mx0a-001b2d01.pphosted.com ([148.163.156.1]:55386 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751554AbdHXGif (ORCPT ); Thu, 24 Aug 2017 02:38:35 -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 v7 07/12] powerpc/vas: Define vas_win_paste_addr() Date: Wed, 23 Aug 2017 23:38:03 -0700 X-Mailer: git-send-email 2.7.4 In-Reply-To: <1503556688-15412-1-git-send-email-sukadev@linux.vnet.ibm.com> References: <1503556688-15412-1-git-send-email-sukadev@linux.vnet.ibm.com> X-TM-AS-GCONF: 00 x-cbid: 17082406-0008-0000-0000-000002738E46 X-IBM-SpamModules-Scores: X-IBM-SpamModules-Versions: BY=3.00007601; HX=3.00000241; KW=3.00000007; PH=3.00000004; SC=3.00000224; SDB=6.00906836; UDB=6.00454554; IPR=6.00687033; BA=6.00005550; NDR=6.00000001; ZLA=6.00000005; ZF=6.00000009; ZB=6.00000000; ZP=6.00000000; ZH=6.00000000; ZU=6.00000002; MB=3.00016840; XFM=3.00000015; UTC=2017-08-24 06:38:31 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 17082406-0009-0000-0000-000036796825 Message-Id: <1503556688-15412-8-git-send-email-sukadev@linux.vnet.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10432:,, definitions=2017-08-24_03:,, signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 spamscore=0 suspectscore=0 malwarescore=0 phishscore=0 adultscore=0 bulkscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1707230000 definitions=main-1708240106 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2068 Lines: 62 Define an interface that the NX drivers can use to find the physical paste address of a send window. This interface is expected to be used with the mmap() operation of the NX driver's device. i.e the user space process can use driver's mmap() operation to map the send window's paste address into their address space and then use copy and paste instructions to submit the CRBs to the NX engine. Note that kernel drivers will use vas_paste_crb() directly and don't need this interface. Signed-off-by: Sukadev Bhattiprolu --- arch/powerpc/include/asm/vas.h | 7 +++++++ arch/powerpc/platforms/powernv/vas-window.c | 10 ++++++++++ 2 files changed, 17 insertions(+) diff --git a/arch/powerpc/include/asm/vas.h b/arch/powerpc/include/asm/vas.h index e34d46a..2f1c168 100644 --- a/arch/powerpc/include/asm/vas.h +++ b/arch/powerpc/include/asm/vas.h @@ -10,6 +10,8 @@ #ifndef _MISC_VAS_H #define _MISC_VAS_H +struct vas_window; + /* * Min and max FIFO sizes are based on Version 1.05 Section 3.1.4.25 * (Local FIFO Size Register) of the VAS workbook. @@ -50,4 +52,9 @@ enum vas_cop_type { VAS_COP_TYPE_MAX, }; +/* + * Return the power bus paste address associated with @win so the caller + * can map that address into their address space. + */ +extern uint64_t vas_win_paste_addr(struct vas_window *win); #endif /* _MISC_VAS_H */ diff --git a/arch/powerpc/platforms/powernv/vas-window.c b/arch/powerpc/platforms/powernv/vas-window.c index 9c12919..3a4599f 100644 --- a/arch/powerpc/platforms/powernv/vas-window.c +++ b/arch/powerpc/platforms/powernv/vas-window.c @@ -35,6 +35,16 @@ void compute_paste_address(struct vas_window *window, uint64_t *addr, int *len) pr_debug("Txwin #%d: Paste addr 0x%llx\n", winid, *addr); } +uint64_t vas_win_paste_addr(struct vas_window *win) +{ + uint64_t addr; + + compute_paste_address(win, &addr, NULL); + + return addr; +} +EXPORT_SYMBOL(vas_win_paste_addr); + static inline void get_hvwc_mmio_bar(struct vas_window *window, uint64_t *start, int *len) { -- 2.7.4