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Sat, 4 Mar 2023 01:07:15 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 15.2.986.41; Fri, 3 Mar 2023 17:07:15 -0800 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 v11 21/26] virt: gunyah: Add IO handlers Date: Fri, 3 Mar 2023 17:06:27 -0800 Message-ID: <20230304010632.2127470-22-quic_eberman@quicinc.com> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20230304010632.2127470-1-quic_eberman@quicinc.com> References: <20230304010632.2127470-1-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: EivT7yLvgbvfel0ymLONl2e5kq-2VPFh X-Proofpoint-ORIG-GUID: EivT7yLvgbvfel0ymLONl2e5kq-2VPFh X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.219,Aquarius:18.0.942,Hydra:6.0.573,FMLib:17.11.170.22 definitions=2023-03-03_07,2023-03-03_01,2023-02-09_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 bulkscore=0 spamscore=0 mlxlogscore=999 lowpriorityscore=0 suspectscore=0 mlxscore=0 priorityscore=1501 malwarescore=0 adultscore=0 impostorscore=0 phishscore=0 clxscore=1015 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2212070000 definitions=main-2303040004 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20230303_170724_724337_CE84DFC3 X-CRM114-Status: GOOD ( 22.10 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Add framework for VM functions to handle stage-2 write faults from Gunyah guest virtual machines. IO handlers have a range of addresses which they apply to. Optionally, they may apply to only when the value written matches the IO handler's value. Co-developed-by: Prakruthi Deepak Heragu Signed-off-by: Prakruthi Deepak Heragu Signed-off-by: Elliot Berman --- drivers/virt/gunyah/vm_mgr.c | 94 +++++++++++++++++++++++++++++++++++ drivers/virt/gunyah/vm_mgr.h | 4 ++ include/linux/gunyah_vm_mgr.h | 25 ++++++++++ 3 files changed, 123 insertions(+) diff --git a/drivers/virt/gunyah/vm_mgr.c b/drivers/virt/gunyah/vm_mgr.c index 0269bcdaf692..b31fac15ff45 100644 --- a/drivers/virt/gunyah/vm_mgr.c +++ b/drivers/virt/gunyah/vm_mgr.c @@ -233,6 +233,100 @@ static void gh_vm_add_resource(struct gh_vm *ghvm, struct gh_resource *ghrsc) mutex_unlock(&ghvm->resources_lock); } +static int _gh_vm_io_handler_compare(const struct rb_node *node, const struct rb_node *parent) +{ + struct gh_vm_io_handler *n = container_of(node, struct gh_vm_io_handler, node); + struct gh_vm_io_handler *p = container_of(parent, struct gh_vm_io_handler, node); + + if (n->addr < p->addr) + return -1; + if (n->addr > p->addr) + return 1; + if ((n->len && !p->len) || (!n->len && p->len)) + return 0; + if (n->len < p->len) + return -1; + if (n->len > p->len) + return 1; + if (n->datamatch < p->datamatch) + return -1; + if (n->datamatch > p->datamatch) + return 1; + return 0; +} + +static int gh_vm_io_handler_compare(struct rb_node *node, const struct rb_node *parent) +{ + return _gh_vm_io_handler_compare(node, parent); +} + +static int gh_vm_io_handler_find(const void *key, const struct rb_node *node) +{ + const struct gh_vm_io_handler *k = key; + + return _gh_vm_io_handler_compare(&k->node, node); +} + +static struct gh_vm_io_handler *gh_vm_mgr_find_io_hdlr(struct gh_vm *ghvm, u64 addr, + u64 len, u64 data) +{ + struct gh_vm_io_handler key = { + .addr = addr, + .len = len, + .datamatch = data, + }; + struct rb_node *node; + + node = rb_find(&key, &ghvm->mmio_handler_root, gh_vm_io_handler_find); + if (!node) + return NULL; + + return container_of(node, struct gh_vm_io_handler, node); +} + +int gh_vm_mmio_write(struct gh_vm *ghvm, u64 addr, u32 len, u64 data) +{ + struct gh_vm_io_handler *io_hdlr = NULL; + int ret; + + down_read(&ghvm->mmio_handler_lock); + io_hdlr = gh_vm_mgr_find_io_hdlr(ghvm, addr, len, data); + if (!io_hdlr || !io_hdlr->ops || !io_hdlr->ops->write) { + ret = -ENODEV; + goto out; + } + + ret = io_hdlr->ops->write(io_hdlr, addr, len, data); + +out: + up_read(&ghvm->mmio_handler_lock); + return ret; +} +EXPORT_SYMBOL_GPL(gh_vm_mmio_write); + +int gh_vm_add_io_handler(struct gh_vm *ghvm, struct gh_vm_io_handler *io_hdlr) +{ + struct rb_node *found; + + if (io_hdlr->datamatch && (!io_hdlr->len || io_hdlr->len > sizeof(io_hdlr->data))) + return -EINVAL; + + down_write(&ghvm->mmio_handler_lock); + found = rb_find_add(&io_hdlr->node, &ghvm->mmio_handler_root, gh_vm_io_handler_compare); + up_write(&ghvm->mmio_handler_lock); + + return found ? -EEXIST : 0; +} +EXPORT_SYMBOL_GPL(gh_vm_add_io_handler); + +void gh_vm_remove_io_handler(struct gh_vm *ghvm, struct gh_vm_io_handler *io_hdlr) +{ + down_write(&ghvm->mmio_handler_lock); + rb_erase(&io_hdlr->node, &ghvm->mmio_handler_root); + up_write(&ghvm->mmio_handler_lock); +} +EXPORT_SYMBOL_GPL(gh_vm_remove_io_handler); + static int gh_vm_rm_notification_status(struct gh_vm *ghvm, void *data) { struct gh_rm_vm_status_payload *payload = data; diff --git a/drivers/virt/gunyah/vm_mgr.h b/drivers/virt/gunyah/vm_mgr.h index 18d0e1effd25..9c1046af80ed 100644 --- a/drivers/virt/gunyah/vm_mgr.h +++ b/drivers/virt/gunyah/vm_mgr.h @@ -55,6 +55,8 @@ struct gh_vm { struct mutex resources_lock; struct list_head resources; struct list_head resource_tickets; + struct rb_root mmio_handler_root; + struct rw_semaphore mmio_handler_lock; }; int gh_vm_mem_alloc(struct gh_vm *ghvm, struct gh_userspace_memory_region *region); @@ -63,4 +65,6 @@ int gh_vm_mem_free(struct gh_vm *ghvm, u32 label); struct gh_vm_mem *gh_vm_mem_find_by_label(struct gh_vm *ghvm, u32 label); struct gh_vm_mem *gh_vm_mem_find_by_addr(struct gh_vm *ghvm, u64 guest_phys_addr, u32 size); +int gh_vm_mmio_write(struct gh_vm *ghvm, u64 addr, u32 len, u64 data); + #endif diff --git a/include/linux/gunyah_vm_mgr.h b/include/linux/gunyah_vm_mgr.h index 01b1761b5923..2dbf5e5f4037 100644 --- a/include/linux/gunyah_vm_mgr.h +++ b/include/linux/gunyah_vm_mgr.h @@ -84,4 +84,29 @@ struct gh_vm_resource_ticket { int gh_vm_add_resource_ticket(struct gh_vm *ghvm, struct gh_vm_resource_ticket *ticket); void gh_vm_remove_resource_ticket(struct gh_vm *ghvm, struct gh_vm_resource_ticket *ticket); +/* + * gh_vm_io_handler contains the info about an io device and its associated + * addr and the ops associated with the io device. + */ +struct gh_vm_io_handler { + struct rb_node node; + u64 addr; + + bool datamatch; + u8 len; + u64 data; + struct gh_vm_io_handler_ops *ops; +}; + +/* + * gh_vm_io_handler_ops contains function pointers associated with an iodevice. + */ +struct gh_vm_io_handler_ops { + int (*read)(struct gh_vm_io_handler *io_dev, u64 addr, u32 len, u64 data); + int (*write)(struct gh_vm_io_handler *io_dev, u64 addr, u32 len, u64 data); +}; + +int gh_vm_add_io_handler(struct gh_vm *ghvm, struct gh_vm_io_handler *io_dev); +void gh_vm_remove_io_handler(struct gh_vm *ghvm, struct gh_vm_io_handler *io_dev); + #endif