From patchwork Mon Nov 21 14:00:06 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Elliot Berman X-Patchwork-Id: 627550 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 6BE14C4332F for ; Mon, 21 Nov 2022 14:04:13 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231547AbiKUOEL (ORCPT ); Mon, 21 Nov 2022 09:04:11 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:40472 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231578AbiKUOCR (ORCPT ); Mon, 21 Nov 2022 09:02:17 -0500 Received: from alexa-out-sd-01.qualcomm.com (alexa-out-sd-01.qualcomm.com [199.106.114.38]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 360242EF53; Mon, 21 Nov 2022 06:02:15 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=quicinc.com; i=@quicinc.com; q=dns/txt; s=qcdkim; t=1669039335; x=1700575335; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=qy6zLlRt58JzjnAnjZx0E210Sky1kDaCzk1olERIjGA=; b=GtK3PqbbD3BmCUPb550lB/G6QPxm4Da7BWe0G6mllY3emKjUbyrMfD9t yx2jxRk89w0+ebdoFQG3dO7ZSQyFuo/XcbZzGOv3Inl35B7aZSDWpbJP4 l510ooPXiKVJGQ1ChGvIQ5m1s+33g0hx7Rv1y+WyMZlaE9ou2veFPS3SW M=; Received: from unknown (HELO ironmsg-SD-alpha.qualcomm.com) ([10.53.140.30]) by alexa-out-sd-01.qualcomm.com with ESMTP; 21 Nov 2022 06:02:14 -0800 X-QCInternal: smtphost Received: from nasanex01b.na.qualcomm.com ([10.46.141.250]) by ironmsg-SD-alpha.qualcomm.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 21 Nov 2022 06:02:14 -0800 Received: from hu-eberman-lv.qualcomm.com (10.49.16.6) by nasanex01b.na.qualcomm.com (10.46.141.250) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.986.36; Mon, 21 Nov 2022 06:02:12 -0800 From: Elliot Berman To: Bjorn Andersson , Elliot Berman , Murali Nalajala CC: Trilok Soni , Srivatsa Vaddagiri , Carl van Schaik , Prakruthi Deepak Heragu , Arnd Bergmann , Greg Kroah-Hartman , Rob Herring , Krzysztof Kozlowski , Jonathan Corbet , Catalin Marinas , Will Deacon , Jassi Brar , Sudeep Holla , Mark Rutland , Lorenzo Pieralisi , , , , , , Subject: [PATCH v7 17/20] gunyah: rsc_mgr: Add platform ops on mem_lend/mem_reclaim Date: Mon, 21 Nov 2022 06:00:06 -0800 Message-ID: <20221121140009.2353512-18-quic_eberman@quicinc.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20221121140009.2353512-1-quic_eberman@quicinc.com> References: <20221121140009.2353512-1-quic_eberman@quicinc.com> MIME-Version: 1.0 X-Originating-IP: [10.49.16.6] X-ClientProxiedBy: nalasex01c.na.qualcomm.com (10.47.97.35) To nasanex01b.na.qualcomm.com (10.46.141.250) Precedence: bulk List-ID: X-Mailing-List: linux-acpi@vger.kernel.org On Qualcomm platforms, there is a firmware entity which controls access to physical pages. In order to share memory with another VM, this entity needs to be informed that the guest VM should have access to the memory. Co-developed-by: Prakruthi Deepak Heragu Signed-off-by: Prakruthi Deepak Heragu Signed-off-by: Elliot Berman --- drivers/virt/gunyah/Kconfig | 4 ++ drivers/virt/gunyah/Makefile | 1 + drivers/virt/gunyah/gunyah_platform_hooks.c | 63 +++++++++++++++++++++ drivers/virt/gunyah/gunyah_rm_rpc.c | 7 ++- drivers/virt/gunyah/rsc_mgr.h | 3 + include/linux/gunyah_rsc_mgr.h | 14 +++++ 6 files changed, 91 insertions(+), 1 deletion(-) create mode 100644 drivers/virt/gunyah/gunyah_platform_hooks.c diff --git a/drivers/virt/gunyah/Kconfig b/drivers/virt/gunyah/Kconfig index 5856b7c5157b..41e619128b3d 100644 --- a/drivers/virt/gunyah/Kconfig +++ b/drivers/virt/gunyah/Kconfig @@ -11,11 +11,15 @@ config GUNYAH Say Y/M here to enable the drivers needed to interact in a Gunyah virtual environment. +config GUNYAH_PLATFORM_HOOKS + tristate + if GUNYAH config GUNYAH_RESOURCE_MANAGER tristate depends on MAILBOX select GUNYAH_MESSAGE_QUEUES + select GUNYAH_PLATFORM_HOOKS config GUNYAH_VM_MANAGER tristate "Gunyah VM Manager" diff --git a/drivers/virt/gunyah/Makefile b/drivers/virt/gunyah/Makefile index 82fd18d518d1..90d589ce1f44 100644 --- a/drivers/virt/gunyah/Makefile +++ b/drivers/virt/gunyah/Makefile @@ -1,4 +1,5 @@ obj-$(CONFIG_GUNYAH) += gunyah.o +obj-$(CONFIG_GUNYAH_PLATFORM_HOOKS) += gunyah_platform_hooks.o obj-$(CONFIG_GUNYAH_RESOURCE_MANAGER) += gunyah_rsc_mgr.o gunyah_rm_rpc.o diff --git a/drivers/virt/gunyah/gunyah_platform_hooks.c b/drivers/virt/gunyah/gunyah_platform_hooks.c new file mode 100644 index 000000000000..36cc02c75963 --- /dev/null +++ b/drivers/virt/gunyah/gunyah_platform_hooks.c @@ -0,0 +1,63 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright (c) 2022 Qualcomm Innovation Center, Inc. All rights reserved. + */ + +#include +#include +#include + +#include "rsc_mgr.h" + +static struct gunyah_rm_platform_ops *rm_platform_ops; +static DECLARE_RWSEM(rm_platform_ops_lock); + +int gh_rm_platform_pre_mem_share(struct gh_rm_rpc *rm, struct gh_rm_mem_parcel *mem_parcel) +{ + int ret = 0; + + down_read(&rm_platform_ops_lock); + if (rm_platform_ops && rm_platform_ops->pre_mem_share) + ret = rm_platform_ops->pre_mem_share(rm, mem_parcel); + up_read(&rm_platform_ops_lock); + return ret; +} +EXPORT_SYMBOL_GPL(gh_rm_platform_pre_mem_share); + +int gh_rm_platform_post_mem_reclaim(struct gh_rm_rpc *rm, struct gh_rm_mem_parcel *mem_parcel) +{ + int ret = 0; + + down_read(&rm_platform_ops_lock); + if (rm_platform_ops && rm_platform_ops->post_mem_reclaim) + ret = rm_platform_ops->post_mem_reclaim(rm, mem_parcel); + up_read(&rm_platform_ops_lock); + return ret; +} +EXPORT_SYMBOL_GPL(gh_rm_platform_post_mem_reclaim); + +int gh_rm_register_platform_ops(struct gunyah_rm_platform_ops *platform_ops) +{ + int ret = 0; + + down_write(&rm_platform_ops_lock); + if (!rm_platform_ops) + rm_platform_ops = platform_ops; + else + ret = -EEXIST; + up_write(&rm_platform_ops_lock); + return ret; +} +EXPORT_SYMBOL_GPL(gh_rm_register_platform_ops); + +void gh_rm_unregister_platform_ops(struct gunyah_rm_platform_ops *platform_ops) +{ + down_write(&rm_platform_ops_lock); + if (rm_platform_ops == platform_ops) + rm_platform_ops = NULL; + up_write(&rm_platform_ops_lock); +} +EXPORT_SYMBOL_GPL(gh_rm_unregister_platform_ops); + +MODULE_LICENSE("GPL"); +MODULE_DESCRIPTION("Gunyah Platform Hooks"); diff --git a/drivers/virt/gunyah/gunyah_rm_rpc.c b/drivers/virt/gunyah/gunyah_rm_rpc.c index 544ec8022104..f81c7b55e7d7 100644 --- a/drivers/virt/gunyah/gunyah_rm_rpc.c +++ b/drivers/virt/gunyah/gunyah_rm_rpc.c @@ -671,6 +671,10 @@ static int gh_rm_mem_lend_common(struct gh_rm_rpc *rm, u32 message_id, struct gh if (initial_n_mem_entries > GH_RM_MAX_MEM_ENTRIES) initial_n_mem_entries = GH_RM_MAX_MEM_ENTRIES; + ret = gh_rm_platform_pre_mem_share(rm, p); + if (ret) + return ret; + /* The format of the message goes: * request header * ACL entries (which VMs get what kind of access to this memory parcel) @@ -714,6 +718,7 @@ static int gh_rm_mem_lend_common(struct gh_rm_rpc *rm, u32 message_id, struct gh if (resp_size != sizeof(u32)) { ret = -EIO; + gh_rm_platform_post_mem_reclaim(rm, p); goto out; } @@ -783,7 +788,7 @@ int gh_rm_mem_reclaim(struct gh_rm_rpc *rm, struct gh_rm_mem_parcel *parcel) return ret; kfree(resp); - return ret; + return gh_rm_platform_post_mem_reclaim(rm, parcel); } EXPORT_SYMBOL_GPL(gh_rm_mem_reclaim); diff --git a/drivers/virt/gunyah/rsc_mgr.h b/drivers/virt/gunyah/rsc_mgr.h index 4712405a3486..3a7f171a7416 100644 --- a/drivers/virt/gunyah/rsc_mgr.h +++ b/drivers/virt/gunyah/rsc_mgr.h @@ -34,6 +34,9 @@ struct platform_device; struct gh_rm_rpc *gh_rm_rpc_init(struct platform_device *pdev); void gh_rm_rpc_remove(struct gh_rm_rpc *rm); +int gh_rm_platform_pre_mem_share(struct gh_rm_rpc *rm, struct gh_rm_mem_parcel *mem_parcel); +int gh_rm_platform_post_mem_reclaim(struct gh_rm_rpc *rm, struct gh_rm_mem_parcel *mem_parcel); + /* Message IDs: Memory Management */ #define GH_RM_RPC_MEM_LEND 0x51000012 #define GH_RM_RPC_MEM_SHARE 0x51000013 diff --git a/include/linux/gunyah_rsc_mgr.h b/include/linux/gunyah_rsc_mgr.h index c0f5c04c64dc..7cdb736f7054 100644 --- a/include/linux/gunyah_rsc_mgr.h +++ b/include/linux/gunyah_rsc_mgr.h @@ -120,4 +120,18 @@ int gh_rm_get_vmid(struct gh_rm_rpc *rm, u16 *vmid); #define GH_RM_BOOT_CONTEXT_REG_SET_SP_ELx 2 int gh_rm_set_boot_context(struct gh_rm_rpc *rm, u16 vmid, u8 reg_set, u8 reg_idx, u64 value); +struct gunyah_rm_platform_ops { + int (*pre_mem_share)(struct gh_rm_rpc *rm, struct gh_rm_mem_parcel *mem_parcel); + int (*post_mem_reclaim)(struct gh_rm_rpc *rm, struct gh_rm_mem_parcel *mem_parcel); +}; + +#if IS_ENABLED(CONFIG_GUNYAH) +int gh_rm_register_platform_ops(struct gunyah_rm_platform_ops *platform_ops); +void gh_rm_unregister_platform_ops(struct gunyah_rm_platform_ops *platform_ops); +#else +static inline int gh_rm_register_platform_ops(struct gunyah_rm_platform_ops *platform_ops) + { return 0; } +static inline void gh_rm_unregister_platform_ops(struct gunyah_rm_platform_ops *platform_ops) { } +#endif + #endif