From patchwork Sat Apr 17 21:08:43 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Haren Myneni X-Patchwork-Id: 12209931 X-Patchwork-Delegate: herbert@gondor.apana.org.au Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-13.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 55B0CC433ED for ; Sat, 17 Apr 2021 21:08:58 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 297BD61354 for ; Sat, 17 Apr 2021 21:08:58 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231635AbhDQVJX (ORCPT ); Sat, 17 Apr 2021 17:09:23 -0400 Received: from mx0b-001b2d01.pphosted.com ([148.163.158.5]:1138 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S231555AbhDQVJX (ORCPT ); Sat, 17 Apr 2021 17:09:23 -0400 Received: from pps.filterd (m0098416.ppops.net [127.0.0.1]) by mx0b-001b2d01.pphosted.com (8.16.0.43/8.16.0.43) with SMTP id 13HL52uS183134; Sat, 17 Apr 2021 17:08:49 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ibm.com; h=message-id : subject : from : to : cc : date : in-reply-to : references : content-type : mime-version : content-transfer-encoding; s=pp1; bh=3P7+txxF4IU30vwypIurEmLDed+qBatjUtRChN5pCX4=; b=iqgPIpNqo+Ap1Db3eYUkFXJO63iKD9OfiTSUEUr2uWA8ty8jIQk/CvrWrbYHaUs9hqeO IoptuacEU4qQE8rnsYLruAz+Z5HtFeVogB0HWQfe7NhEjRxtSDvAGGBJkzCKiz5tOddZ S1eR08YNFzdkzM0waLF5+tNJLpG2edPNePQRbdjhV+PQNzkB61AuZPgwoXaT6XWrlLW8 HkVIEQwvEpR6BvaaTBwwK0zIhphVHyOtMPoIucJh3/qaDnKPf6shGHdUh0Sn2o/hEL7I XPzBWapig6vGka5IKLpVySDUb0OisO3fSMrGYU2mL4xidmO69TYihCTxO18ShXX2Y1h3 7A== Received: from pps.reinject (localhost [127.0.0.1]) by mx0b-001b2d01.pphosted.com with ESMTP id 37ys9t595v-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Sat, 17 Apr 2021 17:08:48 -0400 Received: from m0098416.ppops.net (m0098416.ppops.net [127.0.0.1]) by pps.reinject (8.16.0.43/8.16.0.43) with SMTP id 13HL54KV183324; Sat, 17 Apr 2021 17:08:48 -0400 Received: from ppma03dal.us.ibm.com (b.bd.3ea9.ip4.static.sl-reverse.com [169.62.189.11]) by mx0b-001b2d01.pphosted.com with ESMTP id 37ys9t595r-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Sat, 17 Apr 2021 17:08:48 -0400 Received: from pps.filterd (ppma03dal.us.ibm.com [127.0.0.1]) by ppma03dal.us.ibm.com (8.16.0.43/8.16.0.43) with SMTP id 13HL4F58014539; Sat, 17 Apr 2021 21:08:47 GMT Received: from b03cxnp08025.gho.boulder.ibm.com (b03cxnp08025.gho.boulder.ibm.com [9.17.130.17]) by ppma03dal.us.ibm.com with ESMTP id 37yqa9ewdn-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Sat, 17 Apr 2021 21:08:47 +0000 Received: from b03ledav003.gho.boulder.ibm.com (b03ledav003.gho.boulder.ibm.com [9.17.130.234]) by b03cxnp08025.gho.boulder.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 13HL8kx214811480 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Sat, 17 Apr 2021 21:08:46 GMT Received: from b03ledav003.gho.boulder.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 9BE316A04D; Sat, 17 Apr 2021 21:08:46 +0000 (GMT) Received: from b03ledav003.gho.boulder.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 44E016A054; Sat, 17 Apr 2021 21:08:45 +0000 (GMT) Received: from localhost.localdomain (unknown [9.80.232.48]) by b03ledav003.gho.boulder.ibm.com (Postfix) with ESMTP; Sat, 17 Apr 2021 21:08:45 +0000 (GMT) Message-ID: <4b66c4eea2c0213be658180c987d81f3bb82293d.camel@linux.ibm.com> Subject: [V3 PATCH 10/16] powerpc/pseries/vas: Integrate API with open/close windows From: Haren Myneni To: linuxppc-dev@lists.ozlabs.org, linux-crypto@vger.kernel.org, mpe@ellerman.id.au, herbert@gondor.apana.org.au, npiggin@gmail.com Cc: hbabu@us.ibm.com, haren@us.ibm.com Date: Sat, 17 Apr 2021 14:08:43 -0700 In-Reply-To: References: User-Agent: Evolution 3.36.2 (3.36.2-1.fc32) MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Proofpoint-GUID: pxsmzewg1rFpC3p0DWscoTXpDU4IGcnU X-Proofpoint-ORIG-GUID: AYmUrOSkXzHrn3PJm3DxdP0CrHSudZeI X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.391,18.0.761 definitions=2021-04-17_15:2021-04-16,2021-04-17 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 mlxscore=0 bulkscore=0 spamscore=0 priorityscore=1501 suspectscore=0 adultscore=0 mlxlogscore=999 clxscore=1015 phishscore=0 malwarescore=0 impostorscore=0 lowpriorityscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2104060000 definitions=main-2104170152 Precedence: bulk List-ID: X-Mailing-List: linux-crypto@vger.kernel.org This patch adds VAS window allocatioa/close with the corresponding HCALLs. Also changes to integrate with the existing user space VAS API and provide register/unregister functions to NX pseries driver. The driver register function is used to create the user space interface (/dev/crypto/nx-gzip) and unregister to remove this entry. The user space process opens this device node and makes an ioctl to allocate VAS window. The close interface is used to deallocate window. Signed-off-by: Haren Myneni --- arch/powerpc/include/asm/vas.h | 5 + arch/powerpc/platforms/book3s/Kconfig | 2 +- arch/powerpc/platforms/pseries/Makefile | 1 + arch/powerpc/platforms/pseries/vas.c | 212 ++++++++++++++++++++++++ 4 files changed, 219 insertions(+), 1 deletion(-) diff --git a/arch/powerpc/include/asm/vas.h b/arch/powerpc/include/asm/vas.h index d15784506a54..aa1974aba27e 100644 --- a/arch/powerpc/include/asm/vas.h +++ b/arch/powerpc/include/asm/vas.h @@ -270,6 +270,11 @@ struct vas_all_capabs { u64 feat_type; }; +int plpar_vas_query_capabilities(const u64 hcall, u8 query_type, + u64 result); +int vas_register_api_pseries(struct module *mod, + enum vas_cop_type cop_type, const char *name); +void vas_unregister_api_pseries(void); #endif /* diff --git a/arch/powerpc/platforms/book3s/Kconfig b/arch/powerpc/platforms/book3s/Kconfig index 51e14db83a79..bed21449e8e5 100644 --- a/arch/powerpc/platforms/book3s/Kconfig +++ b/arch/powerpc/platforms/book3s/Kconfig @@ -1,7 +1,7 @@ # SPDX-License-Identifier: GPL-2.0 config PPC_VAS bool "IBM Virtual Accelerator Switchboard (VAS)" - depends on PPC_POWERNV && PPC_64K_PAGES + depends on (PPC_POWERNV || PPC_PSERIES) && PPC_64K_PAGES default y help This enables support for IBM Virtual Accelerator Switchboard (VAS). diff --git a/arch/powerpc/platforms/pseries/Makefile b/arch/powerpc/platforms/pseries/Makefile index c8a2b0b05ac0..4cda0ef87be0 100644 --- a/arch/powerpc/platforms/pseries/Makefile +++ b/arch/powerpc/platforms/pseries/Makefile @@ -30,3 +30,4 @@ obj-$(CONFIG_PPC_SVM) += svm.o obj-$(CONFIG_FA_DUMP) += rtas-fadump.o obj-$(CONFIG_SUSPEND) += suspend.o +obj-$(CONFIG_PPC_VAS) += vas.o diff --git a/arch/powerpc/platforms/pseries/vas.c b/arch/powerpc/platforms/pseries/vas.c index 35946fb02995..0ade0d6d728f 100644 --- a/arch/powerpc/platforms/pseries/vas.c +++ b/arch/powerpc/platforms/pseries/vas.c @@ -222,6 +222,218 @@ int plpar_vas_query_capabilities(const u64 hcall, u8 query_type, return -EIO; } } +EXPORT_SYMBOL_GPL(plpar_vas_query_capabilities); + +/* + * Allocate window and setup IRQ mapping. + */ +static int allocate_setup_window(struct vas_window *txwin, + u64 *domain, u8 wintype) +{ + int rc; + + rc = plpar_vas_allocate_window(txwin, domain, wintype, DEF_WIN_CREDS); + if (rc) + return rc; + + txwin->wcreds_max = DEF_WIN_CREDS; + + return 0; +} + +static struct vas_window *vas_allocate_window(struct vas_tx_win_open_attr *uattr, + enum vas_cop_type cop_type) +{ + long domain[PLPAR_HCALL9_BUFSIZE] = {VAS_DEFAULT_DOMAIN_ID}; + struct vas_ct_capabs *ct_capab; + struct vas_capabs *capabs; + struct vas_window *txwin; + int rc; + + txwin = kzalloc(sizeof(*txwin), GFP_KERNEL); + if (!txwin) + return ERR_PTR(-ENOMEM); + + /* + * A VAS window can have many credits which means that many + * requests can be issued simultaneously. But phyp restricts + * one credit per window. + * phyp introduces 2 different types of credits: + * Default credit type (Uses normal priority FIFO): + * A limited number of credits are assigned to partitions + * based on processor entitlement. But these credits may be + * over-committed on a system depends on whether the CPUs + * are in shared or dedicated modes - that is, more requests + * may be issued across the system than NX can service at + * once which can result in paste command failure (RMA_busy). + * Then the process has to resend requests or fall-back to + * SW compression. + * Quality of Service (QoS) credit type (Uses high priority FIFO): + * To avoid NX HW contention, the system admins can assign + * QoS credits for each LPAR so that this partition is + * guaranteed access to NX resources. These credits are + * assigned to partitions via the HMC. + * Refer PAPR for more information. + * + * Allocate window with QoS credits if user requested. Otherwise + * default credits are used. + */ + if (uattr->flags & VAS_WIN_QOS_CREDITS) + capabs = &vcapabs[VAS_GZIP_QOS_FEAT_TYPE]; + else + capabs = &vcapabs[VAS_GZIP_DEF_FEAT_TYPE]; + + ct_capab = &capabs->capab; + + if (atomic_inc_return(&ct_capab->used_lpar_creds) > + atomic_read(&ct_capab->target_lpar_creds)) { + pr_err("Credits are not available to allocate window\n"); + rc = -EINVAL; + goto out; + } + + /* + * The user space is requesting to allocate a window on a VAS + * instance (or chip) where the process is executing. + * On powerVM, domain values are passed to pHyp to select chip / + * VAS instance. Useful if the process is affinity to NUMA node. + * pHyp selects VAS instance if VAS_DEFAULT_DOMAIN_ID (-1) is + * passed for domain values. + */ + if (uattr->vas_id == -1) { + /* + * To allocate VAS window, pass same domain values returned + * from this HCALL. + */ + rc = plpar_hcall9(H_HOME_NODE_ASSOCIATIVITY, domain, + VPHN_FLAG_VCPU, smp_processor_id()); + if (rc != H_SUCCESS) { + pr_err("HCALL(%x): failed with ret(%d)\n", + H_HOME_NODE_ASSOCIATIVITY, rc); + goto out; + } + } + + /* + * Allocate / Deallocate window HCALLs and setup / free IRQs + * have to be protected with mutex. Otherwise, since IRQ is freed + * after deallocate HCALL, may see the case where window ID and + * fault interrupt could be reused before free IRQ (for the old + * window) in kernel. It can result in setup IRQ fail for the + * new window. + */ + mutex_lock(&vas_pseries_mutex); + rc = allocate_setup_window(txwin, (u64 *)&domain[0], + ct_capab->win_type); + mutex_unlock(&vas_pseries_mutex); + if (rc) + goto out; + + /* + * Modify window and it is ready to use. + */ + rc = plpar_vas_modify_window(txwin); + if (!rc) + rc = vas_reference_task(&txwin->task); + if (rc) + goto out_free; + + txwin->lpar.win_type = ct_capab->win_type; + mutex_lock(&vas_pseries_mutex); + list_add(&txwin->lpar.win_list, &capabs->list); + mutex_unlock(&vas_pseries_mutex); + + return txwin; + +out_free: + plpar_vas_deallocate_window(txwin->winid); +out: + atomic_dec(&ct_capab->used_lpar_creds); + kfree(txwin); + return ERR_PTR(rc); +} + +static u64 vas_paste_address(void *addr) +{ + struct vas_window *win = addr; + + return win->lpar.win_addr; +} + +static int deallocate_free_window(struct vas_window *win) +{ + int rc = 0; + + rc = plpar_vas_deallocate_window(win->winid); + if (!rc) + kfree(win->lpar.name); + + return rc; +} + +static int vas_deallocate_window(void *addr) +{ + struct vas_window *win = (struct vas_window *)addr; + struct vas_ct_capabs *capabs; + int rc = 0; + + if (!win) + return -EINVAL; + + /* Should not happen */ + if (win->lpar.win_type >= VAS_MAX_FEAT_TYPE) { + pr_err("Window (%u): Invalid window type %u\n", + win->winid, win->lpar.win_type); + return -EINVAL; + } + + capabs = &vcapabs[win->lpar.win_type].capab; + mutex_lock(&vas_pseries_mutex); + rc = deallocate_free_window(win); + if (rc) { + mutex_unlock(&vas_pseries_mutex); + return rc; + } + + list_del(&win->lpar.win_list); + atomic_dec(&capabs->used_lpar_creds); + mutex_unlock(&vas_pseries_mutex); + + vas_drop_reference_task(&win->task); + + kfree(win); + return 0; +} + +static struct vas_user_win_ops vops_pseries = { + .open_win = vas_allocate_window, /* Open and configure window */ + .paste_addr = vas_paste_address, /* To do copy/paste */ + .close_win = vas_deallocate_window, /* Close window */ +}; + +/* + * Supporting only nx-gzip coprocessor type now, but this API code + * extended to other coprocessor types later. + */ +int vas_register_api_pseries(struct module *mod, enum vas_cop_type cop_type, + const char *name) +{ + int rc; + + if (!copypaste_feat) + return -ENOTSUPP; + + rc = vas_register_coproc_api(mod, cop_type, name, &vops_pseries); + + return rc; +} +EXPORT_SYMBOL_GPL(vas_register_api_pseries); + +void vas_unregister_api_pseries(void) +{ + vas_unregister_coproc_api(); +} +EXPORT_SYMBOL_GPL(vas_unregister_api_pseries); /* * Get the specific capabilities based on the feature type.