Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752616AbdHHXHa (ORCPT ); Tue, 8 Aug 2017 19:07:30 -0400 Received: from mx0b-001b2d01.pphosted.com ([148.163.158.5]:59240 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1752597AbdHHXH1 (ORCPT ); Tue, 8 Aug 2017 19:07:27 -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 07/17] powerpc/vas: Define vas_win_paste_addr() Date: Tue, 8 Aug 2017 16:06:52 -0700 X-Mailer: git-send-email 2.7.4 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> X-TM-AS-GCONF: 00 x-cbid: 17080823-0048-0000-0000-000001D0948B X-IBM-SpamModules-Scores: X-IBM-SpamModules-Versions: BY=3.00007509; HX=3.00000241; KW=3.00000007; PH=3.00000004; SC=3.00000217; SDB=6.00899536; UDB=6.00450257; IPR=6.00679741; BA=6.00005519; NDR=6.00000001; ZLA=6.00000005; ZF=6.00000009; ZB=6.00000000; ZP=6.00000000; ZH=6.00000000; ZU=6.00000002; MB=3.00016602; XFM=3.00000015; UTC=2017-08-08 23:07:26 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 17080823-0049-0000-0000-0000422AA302 Message-Id: <1502233622-9330-8-git-send-email-sukadev@linux.vnet.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10432:,, definitions=2017-08-08_11:,, 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=8.0.1-1706020000 definitions=main-1708080380 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2055 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 2c8558a..2b35b95 100644 --- a/arch/powerpc/include/asm/vas.h +++ b/arch/powerpc/include/asm/vas.h @@ -12,6 +12,8 @@ #include +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. @@ -32,4 +34,9 @@ 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