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Mon, 19 Dec 2022 23:00:56 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; Mon, 19 Dec 2022 15:00:55 -0800 From: Elliot Berman To: Bjorn Andersson , Elliot Berman , Murali Nalajala , Jonathan Corbet CC: Trilok Soni , Srivatsa Vaddagiri , Carl van Schaik , Prakruthi Deepak Heragu , Arnd Bergmann , Greg Kroah-Hartman , Rob Herring , Krzysztof Kozlowski , Bagas Sanjaya , Catalin Marinas , Will Deacon , Jassi Brar , Sudeep Holla , Mark Rutland , Lorenzo Pieralisi , Dmitry Baryshkov , , , , , , Subject: [PATCH v8 27/28] virt: gunyah: Add irqfd interface Date: Mon, 19 Dec 2022 14:58:48 -0800 Message-ID: <20221219225850.2397345-28-quic_eberman@quicinc.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20221219225850.2397345-1-quic_eberman@quicinc.com> References: <20221219225850.2397345-1-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: 5or1HWkH4LQxbY2CovGsT7oOrv1RQ2EZ X-Proofpoint-ORIG-GUID: 5or1HWkH4LQxbY2CovGsT7oOrv1RQ2EZ X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.205,Aquarius:18.0.923,Hydra:6.0.545,FMLib:17.11.122.1 definitions=2022-12-19_01,2022-12-15_02,2022-06-22_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 malwarescore=0 clxscore=1015 suspectscore=0 impostorscore=0 bulkscore=0 mlxlogscore=999 adultscore=0 spamscore=0 priorityscore=1501 lowpriorityscore=0 phishscore=0 mlxscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2212070000 definitions=main-2212190202 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20221219_150107_759490_9A668C27 X-CRM114-Status: GOOD ( 33.05 ) 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 Enable support for creating irqfds which can raise an interrupt on a Gunyah virtual machine. irqfds are exposed to userspace as a Gunyah VM function with the name "irqfd". If the VM devicetree is not configured to create a doorbell with the corresponding label, userspace will still be able to assert the eventfd but no interrupt will be raised on the guest. Co-developed-by: Prakruthi Deepak Heragu Signed-off-by: Prakruthi Deepak Heragu Signed-off-by: Elliot Berman --- Documentation/virt/gunyah/vm-manager.rst | 22 +++ drivers/virt/gunyah/Kconfig | 10 ++ drivers/virt/gunyah/Makefile | 1 + drivers/virt/gunyah/gunyah_irqfd.c | 180 +++++++++++++++++++++++ include/linux/gunyah.h | 5 + include/uapi/linux/gunyah.h | 11 +- 6 files changed, 228 insertions(+), 1 deletion(-) create mode 100644 drivers/virt/gunyah/gunyah_irqfd.c diff --git a/Documentation/virt/gunyah/vm-manager.rst b/Documentation/virt/gunyah/vm-manager.rst index d11267d59802..b6cf8db826b8 100644 --- a/Documentation/virt/gunyah/vm-manager.rst +++ b/Documentation/virt/gunyah/vm-manager.rst @@ -142,3 +142,25 @@ The vcpu type will register with the VM Manager to expect to control vCPU number `vcpu_id`. It returns a file descriptor allowing interaction with the vCPU. See the Gunyah vCPU API description sections for interacting with the Gunyah vCPU file descriptors. + +Type: "irqfd" +^^^^^^^^^^^^^ + +:: + + struct gh_fn_irqfd_arg { + __u32 fd; + __u32 label; + #define GH_IRQFD_LEVEL (1UL << 0) + #define GH_IRQFD_DEASSIGN (1UL << 1) + __u32 flags; + }; + +Allows setting an eventfd to directly trigger a guest interrupt. +irqfd.fd specifies the file descriptor to use as the eventfd. +irqfd.label corresponds to the doorbell label used in the guest VM's devicetree. +The irqfd is removed using the GH_IRQFD_DEASSIGN flag and specifying at least +the irqfd.label. + +GH_IRQFD_LEVEL configures the corresponding doorbell to behave like a level +triggered interrupt. diff --git a/drivers/virt/gunyah/Kconfig b/drivers/virt/gunyah/Kconfig index f9551cd5dfe4..42842e755a04 100644 --- a/drivers/virt/gunyah/Kconfig +++ b/drivers/virt/gunyah/Kconfig @@ -49,5 +49,15 @@ config GUNYAH_VCPU can schedule the guest VM's vCPUs instead of using Gunyah's scheduler. VMMs can also handle stage 2 faults of the vCPUs. + Say Y/M here if unsure and you want to support Gunyah VMMs. + +config GUNYAH_IRQFD + tristate "Gunyah irqfd interface" + depends on GUNYAH_RESOURCE_MANAGER + depends on GUNYAH_VM_MANAGER + help + Enable kernel support for creating irqfds which can raise an interrupt + on Gunyah virtual machine. + Say Y/M here if unsure and you want to support Gunyah VMMs. endif diff --git a/drivers/virt/gunyah/Makefile b/drivers/virt/gunyah/Makefile index debdd7e4d9a1..065eeb060597 100644 --- a/drivers/virt/gunyah/Makefile +++ b/drivers/virt/gunyah/Makefile @@ -6,3 +6,4 @@ gunyah_rsc_mgr-$(CONFIG_GUNYAH_VM_MANAGER) += vm_mgr.o vm_mgr_mm.o obj-$(CONFIG_GUNYAH_RESOURCE_MANAGER) += gunyah_rsc_mgr.o obj-$(CONFIG_GUNYAH_VCPU) += gunyah_vcpu.o +obj-$(CONFIG_GUNYAH_IRQFD) += gunyah_irqfd.o diff --git a/drivers/virt/gunyah/gunyah_irqfd.c b/drivers/virt/gunyah/gunyah_irqfd.c new file mode 100644 index 000000000000..34ec389323e2 --- /dev/null +++ b/drivers/virt/gunyah/gunyah_irqfd.c @@ -0,0 +1,180 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright (c) 2022 Qualcomm Innovation Center, Inc. All rights reserved. + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include + +struct gunyah_irqfd { + struct gunyah_resource *ghrsc; + struct gunyah_vm_resource_ticket ticket; + struct gunyah_vm_function *f; + + struct kref kref; + bool level; + + struct eventfd_ctx *ctx; + wait_queue_entry_t wait; + poll_table pt; + struct fd fd; + struct work_struct shutdown_work; +}; + +static void gh_irqfd_cleanup(struct kref *kref) +{ + struct gunyah_irqfd *irqfd = container_of(kref, struct gunyah_irqfd, kref); + + kfree(irqfd); +} + + +static void irqfd_shutdown(struct work_struct *work) +{ + struct gunyah_irqfd *irqfd = container_of(work, struct gunyah_irqfd, shutdown_work); + u64 isr; + + if (irqfd->ctx) { + eventfd_ctx_remove_wait_queue(irqfd->ctx, &irqfd->wait, &isr); + eventfd_ctx_put(irqfd->ctx); + fdput(irqfd->fd); + irqfd->ctx = NULL; + irqfd->fd.file = NULL; + } + + kref_put(&irqfd->kref, gh_irqfd_cleanup); +} + +static int irqfd_wakeup(wait_queue_entry_t *wait, unsigned int mode, int sync, void *key) +{ + struct gunyah_irqfd *irqfd = container_of(wait, struct gunyah_irqfd, wait); + __poll_t flags = key_to_poll(key); + u64 enable_mask = GH_DBL_NONBLOCK; + u64 old_flags; + int ret = 0; + + if (flags & EPOLLIN) { + if (irqfd->ghrsc) { + ret = gh_hypercall_dbl_send(irqfd->ghrsc->capid, enable_mask, &old_flags); + if (ret) + pr_err("Failed to assert irq %d\n", irqfd->f->fn.irqfd.label); + } + } + + return 0; +} + +static void irqfd_ptable_queue_proc(struct file *file, wait_queue_head_t *wqh, poll_table *pt) +{ + struct gunyah_irqfd *irq_ctx = container_of(pt, struct gunyah_irqfd, pt); + + add_wait_queue(wqh, &irq_ctx->wait); +} + +static int gunyah_irqfd_populate(struct gunyah_vm_resource_ticket *ticket, + struct gunyah_resource *ghrsc) +{ + struct gunyah_irqfd *irqfd = container_of(ticket, struct gunyah_irqfd, ticket); + u64 enable_mask = GH_DBL_NONBLOCK; + u64 ack_mask = ~0; + int ret = 0; + + irqfd->ghrsc = ghrsc; + if (irqfd->level) { + ret = gh_hypercall_dbl_set_mask(irqfd->ghrsc->capid, enable_mask, ack_mask); + if (ret) + pr_warn("irq %d couldn't be set as level triggered. Might cause IRQ storm if asserted\n", + irqfd->f->fn.irqfd.label); + } + kref_get(&irqfd->kref); + + return 0; +} + +static void gunyah_irqfd_unpopulate(struct gunyah_vm_resource_ticket *ticket, + struct gunyah_resource *ghrsc) +{ + struct gunyah_irqfd *irqfd = container_of(ticket, struct gunyah_irqfd, ticket); + + queue_work(system_wq, &irqfd->shutdown_work); + irqfd->ghrsc = NULL; + kref_put(&irqfd->kref, gh_irqfd_cleanup); +} + +static long gunyah_irqfd_bind(struct gunyah_vm_function *f) +{ + __poll_t events; + struct gunyah_irqfd *irqfd; + long r; + + irqfd = kzalloc(sizeof(*irqfd), GFP_KERNEL); + if (!irqfd) + return -ENOMEM; + + irqfd->f = f; + f->data = irqfd; + + irqfd->fd = fdget(f->fn.irqfd.fd); + if (!irqfd->fd.file) { + r = -EBADF; + goto err_free; + } + + irqfd->ctx = eventfd_ctx_fileget(irqfd->fd.file); + if (IS_ERR(irqfd->ctx)) { + r = PTR_ERR(irqfd->ctx); + goto err_fdput; + } + + if (f->fn.irqfd.flags & GH_IRQFD_LEVEL) + irqfd->level = true; + + irqfd->ticket.resource_type = GUNYAH_RESOURCE_TYPE_BELL_TX; + irqfd->ticket.label = f->fn.irqfd.label; + irqfd->ticket.owner = THIS_MODULE; + irqfd->ticket.populate = gunyah_irqfd_populate; + irqfd->ticket.unpopulate = gunyah_irqfd_unpopulate; + + r = ghvm_add_resource_ticket(f->ghvm, &irqfd->ticket); + if (r) + goto err_ctx; + + init_waitqueue_func_entry(&irqfd->wait, irqfd_wakeup); + INIT_WORK(&irqfd->shutdown_work, irqfd_shutdown); + init_poll_funcptr(&irqfd->pt, irqfd_ptable_queue_proc); + kref_init(&irqfd->kref); + + events = vfs_poll(irqfd->fd.file, &irqfd->pt); + if (events & EPOLLIN) + pr_warn("Premature injection of interrupt\n"); + + return 0; +err_ctx: + eventfd_ctx_put(irqfd->ctx); +err_fdput: + fdput(irqfd->fd); +err_free: + kfree(irqfd); + return r; +} + +static void gunyah_irqfd_release(struct gunyah_vm_function *f) +{ + struct gunyah_irqfd *irqfd = f->data; + + /* unpopulate will trigger clean up of the eventfd */ + ghvm_remove_resource_ticket(irqfd->f->ghvm, &irqfd->ticket); +} + +DECLARE_GUNYAH_VM_FUNCTION_INIT(irqfd, gunyah_irqfd_bind, gunyah_irqfd_release); +MODULE_DESCRIPTION("Gunyah irqfds"); +MODULE_LICENSE("GPL"); diff --git a/include/linux/gunyah.h b/include/linux/gunyah.h index 2c2b498a792d..db5910adc658 100644 --- a/include/linux/gunyah.h +++ b/include/linux/gunyah.h @@ -32,6 +32,11 @@ struct gunyah_resource { u32 rm_label; }; +/** + * Gunyah Doorbells + */ +#define GH_DBL_NONBLOCK BIT(32) + /** * Gunyah Message Queues */ diff --git a/include/uapi/linux/gunyah.h b/include/uapi/linux/gunyah.h index ccc0e6d0f985..5eab212c7bf5 100644 --- a/include/uapi/linux/gunyah.h +++ b/include/uapi/linux/gunyah.h @@ -57,10 +57,19 @@ struct gh_fn_vcpu_arg { __u32 vcpu_id; }; +struct gh_fn_irqfd_arg { + __u32 fd; + __u32 label; +#define GH_IRQFD_LEVEL (1UL << 0) +#define GH_IRQFD_DEASSIGN (1UL << 1) + __u32 flags; +}; + struct gh_vm_function { char name[GUNYAH_FUNCTION_NAME_SIZE]; union { - struct gh_device_vcpu_arg vcpu; + struct gh_fn_vcpu_arg vcpu; + struct gh_fn_irqfd_arg irqfd; char data[GUNYAH_FUNCTION_MAX_ARG_SIZE]; }; };