Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751781AbdHXGit (ORCPT ); Thu, 24 Aug 2017 02:38:49 -0400 Received: from mx0a-001b2d01.pphosted.com ([148.163.156.1]:52791 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751519AbdHXGid (ORCPT ); Thu, 24 Aug 2017 02:38:33 -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 06/12] powerpc/vas: Define helpers to alloc/free windows Date: Wed, 23 Aug 2017 23:38:02 -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: 17082406-2213-0000-0000-0000020E9246 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=6.00687034; 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 06:38:29 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 17082406-2214-0000-0000-00005751D6E0 Message-Id: <1503556688-15412-7-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=2 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: 2067 Lines: 91 Define helpers to allocate/free VAS window objects. These will be used in follow-on patches when opening/closing windows. Signed-off-by: Sukadev Bhattiprolu --- arch/powerpc/platforms/powernv/vas-window.c | 70 +++++++++++++++++++++++++++++ 1 file changed, 70 insertions(+) diff --git a/arch/powerpc/platforms/powernv/vas-window.c b/arch/powerpc/platforms/powernv/vas-window.c index 3a50d6a..9c12919 100644 --- a/arch/powerpc/platforms/powernv/vas-window.c +++ b/arch/powerpc/platforms/powernv/vas-window.c @@ -490,6 +490,76 @@ int init_winctx_regs(struct vas_window *window, struct vas_winctx *winctx) return 0; } +DEFINE_SPINLOCK(vas_ida_lock); + +void vas_release_window_id(struct ida *ida, int winid) +{ + spin_lock(&vas_ida_lock); + ida_remove(ida, winid); + spin_unlock(&vas_ida_lock); +} + +int vas_assign_window_id(struct ida *ida) +{ + int rc, winid; + + rc = ida_pre_get(ida, GFP_KERNEL); + if (!rc) + return -EAGAIN; + + spin_lock(&vas_ida_lock); + rc = ida_get_new_above(ida, 0, &winid); + spin_unlock(&vas_ida_lock); + + if (rc) + return rc; + + if (winid > VAS_WINDOWS_PER_CHIP) { + pr_err("VAS: Too many (%d) open windows\n", winid); + vas_release_window_id(ida, winid); + return -EAGAIN; + } + + return winid; +} + +void vas_window_free(struct vas_window *window) +{ + int winid = window->winid; + struct vas_instance *vinst = window->vinst; + + unmap_winctx_mmio_bars(window); + kfree(window); + + vas_release_window_id(&vinst->ida, winid); +} + +struct vas_window *vas_window_alloc(struct vas_instance *vinst) +{ + int winid; + struct vas_window *window; + + winid = vas_assign_window_id(&vinst->ida); + if (winid < 0) + return ERR_PTR(winid); + + window = kzalloc(sizeof(*window), GFP_KERNEL); + if (!window) + return ERR_PTR(-ENOMEM); + + window->vinst = vinst; + window->winid = winid; + + if (map_winctx_mmio_bars(window)) + goto out_free; + + return window; + +out_free: + kfree(window); + return ERR_PTR(-ENOMEM); +} + /* stub for now */ int vas_win_close(struct vas_window *window) { -- 2.7.4