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Fri, 20 Jan 2023 22:48:05 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 15.2.986.36; Fri, 20 Jan 2023 14:48:04 -0800 From: Elliot Berman To: Bjorn Andersson , Alex Elder , Elliot Berman , Murali Nalajala CC: Trilok Soni , Srivatsa Vaddagiri , Carl van Schaik , Prakruthi Deepak Heragu , Dmitry Baryshkov , Arnd Bergmann , "Greg Kroah-Hartman" , Rob Herring , Krzysztof Kozlowski , Jonathan Corbet , Bagas Sanjaya , Catalin Marinas , Will Deacon , Marc Zyngier , Jassi Brar , Sudeep Holla , , , , , Subject: [PATCH v9 23/27] virt: gunyah: Add IO handlers Date: Fri, 20 Jan 2023 14:46:22 -0800 Message-ID: <20230120224627.4053418-24-quic_eberman@quicinc.com> X-Mailer: git-send-email 2.39.0 In-Reply-To: <20230120224627.4053418-1-quic_eberman@quicinc.com> References: <20230120224627.4053418-1-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: A87Y_caG1S4FalvA4a7H7nv6B8QXsviN X-Proofpoint-ORIG-GUID: A87Y_caG1S4FalvA4a7H7nv6B8QXsviN X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.219,Aquarius:18.0.930,Hydra:6.0.562,FMLib:17.11.122.1 definitions=2023-01-20_11,2023-01-20_01,2022-06-22_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 lowpriorityscore=0 mlxlogscore=999 spamscore=0 suspectscore=0 mlxscore=0 adultscore=0 clxscore=1015 impostorscore=0 priorityscore=1501 bulkscore=0 malwarescore=0 phishscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2212070000 definitions=main-2301200218 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20230120_144815_979931_A6DE0AAC X-CRM114-Status: GOOD ( 21.25 ) 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 | 85 +++++++++++++++++++++++++++++++++++ drivers/virt/gunyah/vm_mgr.h | 4 ++ include/linux/gunyah_vm_mgr.h | 25 +++++++++++ 3 files changed, 114 insertions(+) diff --git a/drivers/virt/gunyah/vm_mgr.c b/drivers/virt/gunyah/vm_mgr.c index ee593cf1b074..1dfe354bcc29 100644 --- a/drivers/virt/gunyah/vm_mgr.c +++ b/drivers/virt/gunyah/vm_mgr.c @@ -185,6 +185,91 @@ void ghvm_remove_resource_ticket(struct gunyah_vm *ghvm, struct gunyah_vm_resour } EXPORT_SYMBOL_GPL(ghvm_remove_resource_ticket); +static inline bool gh_vm_io_handler_matches(struct gunyah_vm_io_handler *io_hdlr, u64 addr, + u64 len, u64 data) +{ + u64 mask = BIT_ULL(io_hdlr->len * BITS_PER_BYTE) - 1; + + if (io_hdlr->addr != addr) + return false; + + if (!io_hdlr->datamatch) + return true; + + if (io_hdlr->len != len) + return false; + + return (data & mask) == (io_hdlr->data & mask); +} + +static struct gunyah_vm_io_handler *gh_vm_mgr_find_io_hdlr(struct gunyah_vm *ghvm, u64 addr, + u64 len, u64 data) +{ + struct gunyah_vm_io_handler *io_hdlr = NULL; + struct rb_node *root = NULL; + + root = ghvm->mmio_handler_root.rb_node; + while (root) { + io_hdlr = rb_entry(root, struct gunyah_vm_io_handler, node); + if (addr < io_hdlr->addr) + root = root->rb_left; + else if (addr > io_hdlr->addr) + root = root->rb_right; + else if (gh_vm_io_handler_matches(io_hdlr, addr, len, data)) + return io_hdlr; + } + return NULL; +} + +int gh_vm_mgr_mmio_write(struct gunyah_vm *ghvm, u64 addr, u32 len, u64 data) +{ + struct gunyah_vm_io_handler *io_hdlr = NULL; + + io_hdlr = gh_vm_mgr_find_io_hdlr(ghvm, addr, len, data); + if (!io_hdlr) + return -ENODEV; + + if (io_hdlr->ops && io_hdlr->ops->write) + return io_hdlr->ops->write(io_hdlr, addr, len, data); + + return -ENODEV; +} +EXPORT_SYMBOL_GPL(gh_vm_mgr_mmio_write); + +int gh_vm_mgr_add_io_handler(struct gunyah_vm *ghvm, struct gunyah_vm_io_handler *io_hdlr) +{ + struct rb_node **root, *parent = NULL; + + if (io_hdlr->datamatch && + (!io_hdlr->len || io_hdlr->len > (sizeof(io_hdlr->data) * BITS_PER_BYTE))) + return -EINVAL; + + root = &ghvm->mmio_handler_root.rb_node; + while (*root) { + struct gunyah_vm_io_handler *curr = rb_entry(*root, struct gunyah_vm_io_handler, + node); + + parent = *root; + if (io_hdlr->addr < curr->addr) + root = &((*root)->rb_left); + else if (io_hdlr->addr > curr->addr) + root = &((*root)->rb_right); + else + return -EEXIST; + } + + rb_link_node(&io_hdlr->node, parent, root); + rb_insert_color(&io_hdlr->node, &ghvm->mmio_handler_root); + return 0; +} +EXPORT_SYMBOL_GPL(gh_vm_mgr_add_io_handler); + +void gh_vm_mgr_remove_io_handler(struct gunyah_vm *ghvm, struct gunyah_vm_io_handler *io_hdlr) +{ + rb_erase(&io_hdlr->node, &ghvm->mmio_handler_root); +} +EXPORT_SYMBOL_GPL(gh_vm_mgr_remove_io_handler); + static void ghvm_put(struct kref *kref) { struct gunyah_vm *ghvm = container_of(kref, struct gunyah_vm, kref); diff --git a/drivers/virt/gunyah/vm_mgr.h b/drivers/virt/gunyah/vm_mgr.h index f52350145010..eb17a2dda2a5 100644 --- a/drivers/virt/gunyah/vm_mgr.h +++ b/drivers/virt/gunyah/vm_mgr.h @@ -52,6 +52,8 @@ struct gunyah_vm { struct list_head resources; struct list_head resource_tickets; + struct rb_root mmio_handler_root; + struct list_head functions; }; @@ -62,4 +64,6 @@ struct gunyah_vm_memory_mapping *gh_vm_mem_mapping_find(struct gunyah_vm *ghvm, struct gunyah_vm_memory_mapping *gh_vm_mem_mapping_find_mapping(struct gunyah_vm *ghvm, u64 gpa, u32 size); +int gh_vm_mgr_mmio_write(struct gunyah_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 995a9b0eb6b7..dd719061f3bf 100644 --- a/include/linux/gunyah_vm_mgr.h +++ b/include/linux/gunyah_vm_mgr.h @@ -79,4 +79,29 @@ struct gunyah_vm_resource_ticket { int ghvm_add_resource_ticket(struct gunyah_vm *ghvm, struct gunyah_vm_resource_ticket *ticket); void ghvm_remove_resource_ticket(struct gunyah_vm *ghvm, struct gunyah_vm_resource_ticket *ticket); +/* + * gunyah_vm_io_handler contains the info about an io device and its associated + * addr and the ops associated with the io device. + */ +struct gunyah_vm_io_handler { + struct rb_node node; + u64 addr; + + bool datamatch; + u8 len; + u64 data; + struct gunyah_vm_io_handler_ops *ops; +}; + +/* + * gunyah_vm_io_handler_ops contains function pointers associated with an iodevice. + */ +struct gunyah_vm_io_handler_ops { + int (*read)(struct gunyah_vm_io_handler *io_dev, u64 addr, u32 len, u64 data); + int (*write)(struct gunyah_vm_io_handler *io_dev, u64 addr, u32 len, u64 data); +}; + +int gh_vm_mgr_add_io_handler(struct gunyah_vm *ghvm, struct gunyah_vm_io_handler *io_dev); +void gh_vm_mgr_remove_io_handler(struct gunyah_vm *ghvm, struct gunyah_vm_io_handler *io_dev); + #endif