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Tue, 09 May 2023 20:49:12 +0000 Received: from nasanex01b.na.qualcomm.com (nasanex01b.na.qualcomm.com [10.46.141.250]) by NASANPPMTA01.qualcomm.com (8.17.1.5/8.17.1.5) with ESMTPS id 349KnBbE014136 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Tue, 9 May 2023 20:49:11 GMT 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 15.2.986.42; Tue, 9 May 2023 13:49:10 -0700 From: Elliot Berman To: Alex Elder , Srinivas Kandagatla , Elliot Berman , Prakruthi Deepak Heragu CC: Murali Nalajala , Trilok Soni , Srivatsa Vaddagiri , Carl van Schaik , Dmitry Baryshkov , Bjorn Andersson , "Konrad Dybcio" , Arnd Bergmann , "Greg Kroah-Hartman" , Rob Herring , Krzysztof Kozlowski , Jonathan Corbet , Bagas Sanjaya , Will Deacon , Andy Gross , Catalin Marinas , Jassi Brar , , , , , Subject: [PATCH v13 13/24] gunyah: rsc_mgr: Add platform ops on mem_lend/mem_reclaim Date: Tue, 9 May 2023 13:47:50 -0700 Message-ID: <20230509204801.2824351-14-quic_eberman@quicinc.com> X-Mailer: git-send-email 2.40.0 In-Reply-To: <20230509204801.2824351-1-quic_eberman@quicinc.com> References: <20230509204801.2824351-1-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) X-QCInternal: smtphost X-Proofpoint-Virus-Version: vendor=nai engine=6200 definitions=5800 signatures=585085 X-Proofpoint-GUID: MYN-qIJQDWbYm6u4kHPEdo1kbHPDv3yH X-Proofpoint-ORIG-GUID: MYN-qIJQDWbYm6u4kHPEdo1kbHPDv3yH X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.254,Aquarius:18.0.942,Hydra:6.0.573,FMLib:17.11.170.22 definitions=2023-05-09_13,2023-05-05_01,2023-02-09_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 mlxscore=0 malwarescore=0 suspectscore=0 adultscore=0 mlxlogscore=999 lowpriorityscore=0 phishscore=0 impostorscore=0 spamscore=0 clxscore=1015 bulkscore=0 priorityscore=1501 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2304280000 definitions=main-2305090171 X-Spam-Status: No, score=-2.8 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_LOW,SPF_HELO_NONE, SPF_PASS,T_SCC_BODY_TEXT_LINE,URIBL_BLOCKED autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-getmail-retrieved-from-mailbox: =?utf-8?q?INBOX?= X-GMAIL-THRID: =?utf-8?q?1765452297172151203?= X-GMAIL-MSGID: =?utf-8?q?1765452297172151203?= 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 Reviewed-by: Alex Elder --- drivers/virt/gunyah/Kconfig | 4 ++ drivers/virt/gunyah/Makefile | 2 + drivers/virt/gunyah/gunyah_platform_hooks.c | 80 +++++++++++++++++++++ drivers/virt/gunyah/rsc_mgr.h | 3 + drivers/virt/gunyah/rsc_mgr_rpc.c | 18 ++++- include/linux/gunyah_rsc_mgr.h | 17 +++++ 6 files changed, 122 insertions(+), 2 deletions(-) create mode 100644 drivers/virt/gunyah/gunyah_platform_hooks.c diff --git a/drivers/virt/gunyah/Kconfig b/drivers/virt/gunyah/Kconfig index 1a737694c333..de815189dab6 100644 --- a/drivers/virt/gunyah/Kconfig +++ b/drivers/virt/gunyah/Kconfig @@ -4,6 +4,7 @@ config GUNYAH tristate "Gunyah Virtualization drivers" depends on ARM64 depends on MAILBOX + select GUNYAH_PLATFORM_HOOKS help The Gunyah drivers are the helper interfaces that run in a guest VM such as basic inter-VM IPC and signaling mechanisms, and higher level @@ -11,3 +12,6 @@ config GUNYAH Say Y/M here to enable the drivers needed to interact in a Gunyah virtual environment. + +config GUNYAH_PLATFORM_HOOKS + tristate diff --git a/drivers/virt/gunyah/Makefile b/drivers/virt/gunyah/Makefile index bacf78b8fa33..4fbeee521d60 100644 --- a/drivers/virt/gunyah/Makefile +++ b/drivers/virt/gunyah/Makefile @@ -1,4 +1,6 @@ # SPDX-License-Identifier: GPL-2.0 +obj-$(CONFIG_GUNYAH_PLATFORM_HOOKS) += gunyah_platform_hooks.o + gunyah-y += rsc_mgr.o rsc_mgr_rpc.o vm_mgr.o vm_mgr_mm.o obj-$(CONFIG_GUNYAH) += gunyah.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..60da0e154e98 --- /dev/null +++ b/drivers/virt/gunyah/gunyah_platform_hooks.c @@ -0,0 +1,80 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright (c) 2022-2023 Qualcomm Innovation Center, Inc. All rights reserved. + */ + +#include +#include +#include + +#include "rsc_mgr.h" + +static struct gh_rm_platform_ops *rm_platform_ops; +static DECLARE_RWSEM(rm_platform_ops_lock); + +int gh_rm_platform_pre_mem_share(struct gh_rm *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 *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 gh_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 gh_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); + +static void _devm_gh_rm_unregister_platform_ops(void *data) +{ + gh_rm_unregister_platform_ops(data); +} + +int devm_gh_rm_register_platform_ops(struct device *dev, struct gh_rm_platform_ops *ops) +{ + int ret; + + ret = gh_rm_register_platform_ops(ops); + if (ret) + return ret; + + return devm_add_action(dev, _devm_gh_rm_unregister_platform_ops, ops); +} +EXPORT_SYMBOL_GPL(devm_gh_rm_register_platform_ops); + +MODULE_LICENSE("GPL"); +MODULE_DESCRIPTION("Gunyah Platform Hooks"); diff --git a/drivers/virt/gunyah/rsc_mgr.h b/drivers/virt/gunyah/rsc_mgr.h index 8309b7bf4668..3d43bb79ff44 100644 --- a/drivers/virt/gunyah/rsc_mgr.h +++ b/drivers/virt/gunyah/rsc_mgr.h @@ -13,4 +13,7 @@ struct gh_rm; int gh_rm_call(struct gh_rm *rsc_mgr, u32 message_id, const void *req_buf, size_t req_buf_size, void **resp_buf, size_t *resp_buf_size); +int gh_rm_platform_pre_mem_share(struct gh_rm *rm, struct gh_rm_mem_parcel *mem_parcel); +int gh_rm_platform_post_mem_reclaim(struct gh_rm *rm, struct gh_rm_mem_parcel *mem_parcel); + #endif diff --git a/drivers/virt/gunyah/rsc_mgr_rpc.c b/drivers/virt/gunyah/rsc_mgr_rpc.c index 4f25f07400b3..835a851ae71b 100644 --- a/drivers/virt/gunyah/rsc_mgr_rpc.c +++ b/drivers/virt/gunyah/rsc_mgr_rpc.c @@ -207,6 +207,12 @@ static int gh_rm_mem_lend_common(struct gh_rm *rm, u32 message_id, struct gh_rm_ if (!msg) return -ENOMEM; + ret = gh_rm_platform_pre_mem_share(rm, p); + if (ret) { + kfree(msg); + return ret; + } + req_header = msg; acl_section = (void *)req_header + sizeof(*req_header); mem_section = (void *)acl_section + acl_section_size; @@ -231,8 +237,10 @@ static int gh_rm_mem_lend_common(struct gh_rm *rm, u32 message_id, struct gh_rm_ ret = gh_rm_call(rm, message_id, msg, msg_size, (void **)&resp, &resp_size); kfree(msg); - if (ret) + if (ret) { + gh_rm_platform_post_mem_reclaim(rm, p); return ret; + } p->mem_handle = le32_to_cpu(*resp); kfree(resp); @@ -287,8 +295,14 @@ int gh_rm_mem_reclaim(struct gh_rm *rm, struct gh_rm_mem_parcel *parcel) struct gh_rm_mem_release_req req = { .mem_handle = cpu_to_le32(parcel->mem_handle), }; + int ret; + + ret = gh_rm_call(rm, GH_RM_RPC_MEM_RECLAIM, &req, sizeof(req), NULL, NULL); + /* Only call the platform mem reclaim hooks if we reclaimed the memory */ + if (ret) + return ret; - return gh_rm_call(rm, GH_RM_RPC_MEM_RECLAIM, &req, sizeof(req), NULL, NULL); + return gh_rm_platform_post_mem_reclaim(rm, parcel); } /** diff --git a/include/linux/gunyah_rsc_mgr.h b/include/linux/gunyah_rsc_mgr.h index dfac088420bd..7c599654ea30 100644 --- a/include/linux/gunyah_rsc_mgr.h +++ b/include/linux/gunyah_rsc_mgr.h @@ -139,4 +139,21 @@ int gh_rm_get_hyp_resources(struct gh_rm *rm, u16 vmid, struct gh_rm_hyp_resources **resources); int gh_rm_get_vmid(struct gh_rm *rm, u16 *vmid); +struct gh_rm_platform_ops { + int (*pre_mem_share)(struct gh_rm *rm, struct gh_rm_mem_parcel *mem_parcel); + int (*post_mem_reclaim)(struct gh_rm *rm, struct gh_rm_mem_parcel *mem_parcel); +}; + +#if IS_ENABLED(CONFIG_GUNYAH_PLATFORM_HOOKS) +int gh_rm_register_platform_ops(struct gh_rm_platform_ops *platform_ops); +void gh_rm_unregister_platform_ops(struct gh_rm_platform_ops *platform_ops); +int devm_gh_rm_register_platform_ops(struct device *dev, struct gh_rm_platform_ops *ops); +#else +static inline int gh_rm_register_platform_ops(struct gh_rm_platform_ops *platform_ops) + { return 0; } +static inline void gh_rm_unregister_platform_ops(struct gh_rm_platform_ops *platform_ops) { } +static inline int devm_gh_rm_register_platform_ops(struct device *dev, + struct gh_rm_platform_ops *ops) { return 0; } +#endif + #endif