From patchwork Mon Aug 1 21:12:37 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Elliot Berman X-Patchwork-Id: 12934077 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 bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id E2202C19F29 for ; Mon, 1 Aug 2022 21:17:15 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-ID:Date:Subject:CC:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=cOm7hYH8XSZc8+s/9ZuW3bGUPhhl75ms9RIw+0qS0wg=; b=OYUcRVekqHK7sA VR2dyWqREbq/qfWupvri+j7IbANuZzdH1MC4CG2CM81F+GPzDmlULzFLNa0pufBVmA1xrdxWa62Aj svztq2mVxh8T96McqUkm8VpRKdbXQPvZjF9BehM6xtrmyMtZ1ilYY2akGNJPz1dMCL2jBWCfwMQeQ R/5U0hQSNBT2kpnGYGekJjbQcIrhIPyrHA0BheyfBFD0qzpsjs00xukmOHfPzBTZ8tYoVWRV2AhE0 lgZl6ftSDUBlhdLEyyRjBrEf0uEafEZOPjAS5LJn2CJQ1w1TxfScF22qheMa860mcXGAlSMgyWGlT eQnQegUzQBDwXj0aNtsA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1oIclf-00Aih4-DQ; Mon, 01 Aug 2022 21:16:03 +0000 Received: from alexa-out-sd-01.qualcomm.com ([199.106.114.38]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1oIcjl-00Ah6P-Rs for linux-arm-kernel@lists.infradead.org; Mon, 01 Aug 2022 21:14:09 +0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=quicinc.com; i=@quicinc.com; q=dns/txt; s=qcdkim; t=1659388445; x=1690924445; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=5/aSZM4f3z/9XJTcxshtcyVWDSuHSE81mwr8fNk8a3s=; b=lUTnlI+dZbJPfdJkCzIKA9emmK3z06t0Hu2jPWFkrN3xnrBIa6BxnRew jI6UDxrWLscPucAM9QGlXSmsFCQzECHCfymwxPIbRMlynt6WcI+XLh5aM 7KP1VpKfExxOQyZKaI67bh7JZTWhkAHI8j72UBXf2daRM+Gheli8QD1SV k=; Received: from unknown (HELO ironmsg04-sd.qualcomm.com) ([10.53.140.144]) by alexa-out-sd-01.qualcomm.com with ESMTP; 01 Aug 2022 14:14:00 -0700 X-QCInternal: smtphost Received: from nasanex01b.na.qualcomm.com ([10.46.141.250]) by ironmsg04-sd.qualcomm.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 01 Aug 2022 14:14:00 -0700 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 15.2.986.22; Mon, 1 Aug 2022 14:13:59 -0700 From: Elliot Berman To: Bjorn Andersson CC: Elliot Berman , Murali Nalajala , Trilok Soni , "Srivatsa Vaddagiri" , Carl van Schaik , Andy Gross , , Lorenzo Pieralisi , Sudeep Holla , "Marc Zyngier" , Rob Herring , "Krzysztof Kozlowski" , Jonathan Corbet , Will Deacon , Catalin Marinas , , , Subject: [PATCH v2 08/11] gunyah: rsc_mgr: Add resource manager RPC core Date: Mon, 1 Aug 2022 14:12:37 -0700 Message-ID: <20220801211240.597859-9-quic_eberman@quicinc.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20220801211240.597859-1-quic_eberman@quicinc.com> References: <20220801211240.597859-1-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-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20220801_141405_998843_3FD20D8A X-CRM114-Status: GOOD ( 32.50 ) 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 The resource manager is a special virtual machine which is always running on a Gunyah system. It provides APIs for creating and destroying VMs, secure memory management, sharing/lending of memory between VMs, and setup of inter-VM communication. Calls to the resource manager are made via message queues. This patch implements the basic probing and RPC mechanism to make those API calls. Request/response calls can be made with gh_rm_call. Drivers can also register to notifications pushed by RM via gh_rm_register_notifier Specific API calls that resource manager supports will be implemented in subsequent patches. Signed-off-by: Elliot Berman --- MAINTAINERS | 2 +- drivers/virt/gunyah/Kconfig | 1 + drivers/virt/gunyah/Makefile | 1 + drivers/virt/gunyah/gunyah_private.h | 3 + drivers/virt/gunyah/rsc_mgr.c | 623 +++++++++++++++++++++++++++ drivers/virt/gunyah/rsc_mgr.h | 34 ++ drivers/virt/gunyah/sysfs.c | 7 + include/linux/gunyah_rsc_mgr.h | 29 ++ 8 files changed, 699 insertions(+), 1 deletion(-) create mode 100644 drivers/virt/gunyah/rsc_mgr.c create mode 100644 drivers/virt/gunyah/rsc_mgr.h create mode 100644 include/linux/gunyah_rsc_mgr.h diff --git a/MAINTAINERS b/MAINTAINERS index e63c51ee1a2a..dcd961d6623c 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -8746,7 +8746,7 @@ F: Documentation/devicetree/bindings/firmware/gunyah-hypervisor.yaml F: Documentation/virt/gunyah/ F: arch/arm64/include/asm/gunyah.h F: drivers/virt/gunyah/ -F: include/linux/gunyah.h +F: include/linux/gunyah*.h HABANALABS PCI DRIVER M: Oded Gabbay diff --git a/drivers/virt/gunyah/Kconfig b/drivers/virt/gunyah/Kconfig index 1e493017885e..0adb6efd4848 100644 --- a/drivers/virt/gunyah/Kconfig +++ b/drivers/virt/gunyah/Kconfig @@ -4,6 +4,7 @@ config GUNYAH tristate "Gunyah Virtualization drivers" depends on ARM64 select SYS_HYPERVISOR + select AUXILIARY_BUS help The Gunyah drivers are the helper interfaces that runs in a guest VM such as basic inter-VM IPC and signaling mechanisms and higher level diff --git a/drivers/virt/gunyah/Makefile b/drivers/virt/gunyah/Makefile index 94dc8e738911..86655bca8944 100644 --- a/drivers/virt/gunyah/Makefile +++ b/drivers/virt/gunyah/Makefile @@ -1,4 +1,5 @@ # SPDX-License-Identifier: GPL-2.0-only gunyah-y += sysfs.o device.o msgq.o +gunyah-y += rsc_mgr.o obj-$(CONFIG_GUNYAH) += gunyah.o \ No newline at end of file diff --git a/drivers/virt/gunyah/gunyah_private.h b/drivers/virt/gunyah/gunyah_private.h index 2ade32bd9bdf..6483ffa8c15d 100644 --- a/drivers/virt/gunyah/gunyah_private.h +++ b/drivers/virt/gunyah/gunyah_private.h @@ -12,4 +12,7 @@ void gunyah_bus_exit(void); int __init gh_msgq_init(void); void gh_msgq_exit(void); +int __init gh_rsc_mgr_init(void); +void gh_rsc_mgr_exit(void); + #endif diff --git a/drivers/virt/gunyah/rsc_mgr.c b/drivers/virt/gunyah/rsc_mgr.c new file mode 100644 index 000000000000..b8268ee02fab --- /dev/null +++ b/drivers/virt/gunyah/rsc_mgr.c @@ -0,0 +1,623 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright (c) 2022 Qualcomm Innovation Center, Inc. All rights reserved. + */ + +#define pr_fmt(fmt) "gh_rsc_mgr: " fmt + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include "gunyah_private.h" +#include "rsc_mgr.h" + +/* Resource Manager Header */ +struct gh_rm_rpc_hdr { + u8 version:4, + hdr_words:4; + u8 type:2, + fragments:6; + u16 seq; + u32 msg_id; +} __packed; + +/* Standard reply header */ +struct gh_rm_rpc_reply_hdr { + struct gh_rm_rpc_hdr rpc_hdr; + u32 err_code; +} __packed; + +/* RPC Header versions */ +#define GH_RM_RPC_HDR_VERSION_ONE 0x1 + +/* RPC Header words */ +#define GH_RM_RPC_HDR_WORDS 0x2 + +/* RPC Message types */ +#define GH_RM_RPC_TYPE_CONT 0x0 +#define GH_RM_RPC_TYPE_REQ 0x1 +#define GH_RM_RPC_TYPE_RPLY 0x2 +#define GH_RM_RPC_TYPE_NOTIF 0x3 + +#define GH_RM_MAX_NUM_FRAGMENTS 62 + +#define GH_RM_MAX_MSG_SIZE (GH_MSGQ_MAX_MSG_SIZE - sizeof(struct gh_rm_rpc_hdr)) + +/** + * struct gh_rm_connection - Represents a complete message from resource manager + * @payload: Combined payload of all the fragments (i.e. msg headers stripped off). + * @size: Size of the payload. + * @ret: Linux return code, set in case there was an error processing the connection. + * @msg_id: Message ID from the header. + * @type: GH_RM_RPC_TYPE_RPLY or GH_RM_RPC_TYPE_NOTIF. + * @num_fragments: total number of fragments expected to be received for this connection. + * @fragments_recieved: fragments received so far. + * @rm_error: For request/reply sequences with standard replies. + * @seq: Sequence ID for the main message. + */ +struct gh_rm_connection { + void *payload; + size_t size; + int ret; + u32 msg_id; + u8 type; + + u8 num_fragments; + u8 fragments_received; + + /* only for req/reply sequence */ + u32 rm_error; + u16 seq; + struct completion seq_done; +}; + +struct gh_rm_notif_complete { + struct gh_rm_connection *conn; + struct work_struct work; +}; + +struct gh_rsc_mgr { + struct task_struct *recv_task; + struct gunyah_device *msgq_tx, *msgq_rx; + + struct idr call_idr; + struct mutex call_idr_lock; + + struct mutex send_lock; +}; + +static struct gh_rsc_mgr *__rsc_mgr; +SRCU_NOTIFIER_HEAD_STATIC(gh_rm_notifier); + +static struct gh_rm_connection *gh_rm_alloc_connection(u32 msg_id, u8 type) +{ + struct gh_rm_connection *connection; + + connection = kzalloc(sizeof(*connection), GFP_KERNEL); + if (!connection) + return NULL; + + connection->type = type; + connection->msg_id = msg_id; + + return connection; +} + +/** + * gh_rm_init_connection_payload() - Fills the first message for a connection. + */ +static int gh_rm_init_connection_payload(struct gh_rm_connection *connection, void *msg, + size_t hdr_size, size_t payload_size) +{ + struct gh_rm_rpc_hdr *hdr = msg; + size_t max_buf_size; + + connection->num_fragments = hdr->fragments; + connection->fragments_received = 0; + connection->type = hdr->type; + + /* There's not going to be any payload, no need to allocate buffer. */ + if (!payload_size && !connection->num_fragments) + return 0; + + /* + * maximum payload size is GH_MSGQ_MAX_MSG_SIZE - hdr_size + * and can received (hdr->fragments + 1) of those + */ + max_buf_size = (GH_MSGQ_MAX_MSG_SIZE - hdr_size) * (hdr->fragments + 1); + + connection->payload = kzalloc(max_buf_size, GFP_KERNEL); + if (!connection->payload) + return -ENOMEM; + + memcpy(connection->payload, msg + hdr_size, payload_size); + connection->size = payload_size; + return 0; +} + +static void gh_rm_notif_work(struct work_struct *work) +{ + struct gh_rm_notif_complete *notif = container_of(work, struct gh_rm_notif_complete, work); + struct gh_rm_connection *connection = notif->conn; + u32 notif_id = connection->msg_id; + struct gh_rm_notification notification = { + .buff = connection->payload, + .size = connection->size, + }; + + srcu_notifier_call_chain(&gh_rm_notifier, notif_id, ¬ification); + + kfree(connection->payload); + kfree(connection); + kfree(notif); +} + +static struct gh_rm_connection *gh_rm_process_notif(struct gh_rsc_mgr *rsc_mgr, + void *msg, size_t msg_size) +{ + struct gh_rm_rpc_hdr *hdr = msg; + struct gh_rm_connection *connection; + + connection = gh_rm_alloc_connection(hdr->msg_id, hdr->type); + if (!connection) { + pr_err("Failed to alloc connection for notification, dropping.\n"); + return NULL; + } + + if (gh_rm_init_connection_payload(connection, msg, sizeof(*hdr), msg_size - sizeof(*hdr))) { + pr_err("Failed to alloc connection buffer for notification, dropping.\n"); + kfree(connection); + return NULL; + } + + return connection; +} + +static struct gh_rm_connection *gh_rm_process_rply(struct gh_rsc_mgr *rsc_mgr, + void *msg, size_t msg_size) +{ + struct gh_rm_rpc_reply_hdr *reply_hdr = msg; + struct gh_rm_rpc_hdr *hdr = msg; + struct gh_rm_connection *connection; + + if (mutex_lock_interruptible(&rsc_mgr->call_idr_lock)) + return ERR_PTR(-ERESTARTSYS); + + connection = idr_find(&rsc_mgr->call_idr, hdr->seq); + mutex_unlock(&rsc_mgr->call_idr_lock); + + if (!connection) { + pr_err("Failed to find connection for sequence %u\n", hdr->seq); + return NULL; + } + if (connection->msg_id != hdr->msg_id) { + pr_err("Reply for sequence %u expected msg_id: %x but got %x\n", hdr->seq, + connection->msg_id, hdr->msg_id); + /* + * Don't complete connection and error the client, maybe resource manager will + * send us the expected reply sequence soon. + */ + return NULL; + } + + if (gh_rm_init_connection_payload(connection, msg, sizeof(*reply_hdr), + msg_size - sizeof(*reply_hdr))) { + pr_err("Failed to alloc connection buffer for sequence %d\n", hdr->seq); + /* Send connection complete and error the client. */ + connection->ret = -ENOMEM; + complete(&connection->seq_done); + return NULL; + } + + connection->rm_error = reply_hdr->err_code; + return connection; +} + +static void gh_rm_process_cont(struct gh_rm_connection *connection, void *msg, size_t msg_size) +{ + struct gh_rm_rpc_hdr *hdr = msg; + size_t payload_size = msg_size - sizeof(*hdr); + + /* + * hdr->fragments and hdr->msg_id preserves the value from first reply or notif message. + * For sake of sanity, check if it's still intact. + */ + if (connection->msg_id != hdr->msg_id) + pr_warn("Appending mismatched continuation with id %d to connection with id %d\n", + hdr->msg_id, connection->msg_id); + if (connection->num_fragments != hdr->fragments) + pr_warn("Number of fragments mismatch for seq: %d\n", hdr->seq); + + memcpy(connection->payload + connection->size, msg + sizeof(*hdr), payload_size); + connection->size += payload_size; + connection->fragments_received++; +} + +static bool gh_rm_complete_connection(struct gh_rm_connection *connection) +{ + struct gh_rm_notif_complete *notif_work; + + if (!connection) + return false; + + if (connection->fragments_received != connection->num_fragments) + return false; + + switch (connection->type) { + case GH_RM_RPC_TYPE_RPLY: + complete(&connection->seq_done); + break; + case GH_RM_RPC_TYPE_NOTIF: + notif_work = kzalloc(sizeof(*notif_work), GFP_KERNEL); + if (notif_work == NULL) + break; + + notif_work->conn = connection; + INIT_WORK(¬if_work->work, gh_rm_notif_work); + + schedule_work(¬if_work->work); + break; + default: + pr_err("Invalid message type (%d) received\n", connection->type); + break; + } + + return true; +} + +static void gh_rm_abort_connection(struct gh_rm_connection *connection) +{ + switch (connection->type) { + case GH_RM_RPC_TYPE_RPLY: + connection->ret = -EIO; + complete(&connection->seq_done); + break; + case GH_RM_RPC_TYPE_NOTIF: + fallthrough; + default: + kfree(connection->payload); + kfree(connection); + } +} + +static int gh_rm_recv_task_fn(void *data) +{ + struct gh_rsc_mgr *rsc_mgr = data; + struct gh_rm_connection *connection = NULL; + struct gh_rm_rpc_hdr *hdr = NULL; + ssize_t msg_size; + void *msg; + + msg = kzalloc(GH_MSGQ_MAX_MSG_SIZE, GFP_KERNEL); + if (!msg) + return -ENOMEM; + + while (!kthread_should_stop()) { + /* Block until a new message is received */ + msg_size = gh_msgq_recv(rsc_mgr->msgq_rx, msg, GH_MSGQ_MAX_MSG_SIZE, 0); + if (msg_size < 0) { + pr_err("Failed to receive the message: %ld\n", msg_size); + continue; + } else if (msg_size <= sizeof(struct gh_rm_rpc_hdr)) { + pr_err("Invalid message size received: %ld is too small\n", msg_size); + continue; + } + + hdr = msg; + switch (hdr->type) { + case GH_RM_RPC_TYPE_NOTIF: + if (connection) { + /* Not possible per protocol. Do something better than BUG_ON */ + pr_warn("Received start of new notification without finishing existing message series.\n"); + gh_rm_abort_connection(connection); + } + connection = gh_rm_process_notif(rsc_mgr, msg, msg_size); + break; + case GH_RM_RPC_TYPE_RPLY: + if (connection) { + /* Not possible per protocol. Do something better than BUG_ON */ + pr_warn("Received start of new reply without finishing existing message series.\n"); + gh_rm_abort_connection(connection); + } + connection = gh_rm_process_rply(rsc_mgr, msg, msg_size); + break; + case GH_RM_RPC_TYPE_CONT: + if (!connection) { + pr_warn("Received a continuation message without receiving initial message\n"); + break; + } + gh_rm_process_cont(connection, msg, msg_size); + break; + default: + pr_err("Invalid message type (%d) received\n", hdr->type); + continue; + } + + if (gh_rm_complete_connection(connection)) + connection = NULL; + } + + return 0; +} + +static int gh_rm_send_request(struct gh_rsc_mgr *rsc_mgr, u32 message_id, + const void *req_buff, size_t req_buff_size, + struct gh_rm_connection *connection) +{ + size_t buff_size_remaining = req_buff_size; + const void *req_buff_curr = req_buff; + struct gh_rm_rpc_hdr *hdr; + unsigned long tx_flags; + u32 num_fragments = 0; + size_t payload_size; + void *msg; + int i, ret = 0; + + if (req_buff_size > GH_RM_MAX_MSG_SIZE) + num_fragments = req_buff_size / GH_RM_MAX_MSG_SIZE; + + if (WARN(num_fragments > GH_RM_MAX_NUM_FRAGMENTS, + "Limit exceeded for the number of fragments: %u\n", num_fragments)) + return -E2BIG; + + /* + * The above calculation also includes the count for the 'request' packet. + * Exclude it as the header needs to fill the num. of fragments to follow. + */ + if (num_fragments) + num_fragments--; + + if (mutex_lock_interruptible(&rsc_mgr->send_lock)) + return -ERESTARTSYS; + + msg = kzalloc(GH_MSGQ_MAX_MSG_SIZE, GFP_KERNEL); + if (!msg) { + mutex_unlock(&rsc_mgr->send_lock); + return -ENOMEM; + } + + /* Consider also the 'request' packet for the loop count */ + for (i = 0; i <= num_fragments; i++) { + if (buff_size_remaining > GH_RM_MAX_MSG_SIZE) { + payload_size = GH_RM_MAX_MSG_SIZE; + buff_size_remaining -= payload_size; + } else { + payload_size = buff_size_remaining; + } + + memset(msg, 0, GH_MSGQ_MAX_MSG_SIZE); + + /* Fill header */ + hdr = msg; + hdr->version = GH_RM_RPC_HDR_VERSION_ONE; + hdr->hdr_words = GH_RM_RPC_HDR_WORDS; + hdr->type = i == 0 ? GH_RM_RPC_TYPE_REQ : GH_RM_RPC_TYPE_CONT; + hdr->fragments = num_fragments; + hdr->seq = connection->seq; + hdr->msg_id = message_id; + + /* Copy payload */ + memcpy(msg + sizeof(*hdr), req_buff_curr, payload_size); + req_buff_curr += payload_size; + + /* Force the last fragment to be sent immediately to the receiver */ + tx_flags = (i == num_fragments) ? GH_MSGQ_TX_PUSH : 0; + + ret = gh_msgq_send(rsc_mgr->msgq_tx, msg, sizeof(*hdr) + payload_size, tx_flags); + + if (ret < 0) + break; + } + + mutex_unlock(&rsc_mgr->send_lock); + return ret < 0 ? ret : 0; +} + +/** + * gh_rm_call: Achieve request-response type communication with RPC + * @message_id: The RM RPC message-id + * @req_buff: Request buffer that contains the payload + * @req_buff_size: Total size of the payload + * @resp_buf: Pointer to a response buffer + * @resp_buff_size: Size of the response buffer + * @reply_err_code: Returns Gunyah standard error code for the response + * + * Make a request to the RM-VM and wait for reply back. For a successful + * response, the function returns the payload. The size of the payload is set in resp_buff_size. + * The resp_buf should be freed by the caller. + * + * Context: Process context. Will sleep waiting for reply. + * Return: >0 is standard reply error from RM. <0 on internal error. + */ +int gh_rm_call(u32 message_id, void *req_buff, size_t req_buff_size, + void **resp_buf, size_t *resp_buff_size) +{ + struct gh_rm_connection *connection; + int ret; + struct gh_rsc_mgr *rsc_mgr = __rsc_mgr; + + /* messaged_id 0 is reserved */ + if (!message_id) + return -EINVAL; + + if (!rsc_mgr) + return -EPROBE_DEFER; + + connection = gh_rm_alloc_connection(message_id, GH_RM_RPC_TYPE_RPLY); + if (!connection) + return -ENOMEM; + + init_completion(&connection->seq_done); + + /* Allocate a new seq number for this connection */ + if (mutex_lock_interruptible(&rsc_mgr->call_idr_lock)) { + kfree(connection); + return -ERESTARTSYS; + } + connection->seq = idr_alloc_cyclic(&rsc_mgr->call_idr, connection, 0, U16_MAX, GFP_KERNEL); + mutex_unlock(&rsc_mgr->call_idr_lock); + + /* Send the request to the Resource Manager */ + ret = gh_rm_send_request(rsc_mgr, message_id, req_buff, req_buff_size, connection); + if (ret < 0) + goto out; + + /* Wait for response */ + wait_for_completion(&connection->seq_done); + + if (connection->ret) { + ret = connection->ret; + kfree(connection->payload); + goto out; + } + + if (connection->rm_error) { + ret = connection->rm_error; + kfree(connection->payload); + goto out; + } + + *resp_buf = connection->payload; + *resp_buff_size = connection->size; + +out: + mutex_lock(&rsc_mgr->call_idr_lock); + idr_remove(&rsc_mgr->call_idr, connection->seq); + mutex_unlock(&rsc_mgr->call_idr_lock); + + kfree(connection); + return ret; +} + +int gh_rm_register_notifier(struct notifier_block *nb) +{ + return srcu_notifier_chain_register(&gh_rm_notifier, nb); +} +EXPORT_SYMBOL_GPL(gh_rm_register_notifier); + +int gh_rm_unregister_notifier(struct notifier_block *nb) +{ + return srcu_notifier_chain_unregister(&gh_rm_notifier, nb); +} +EXPORT_SYMBOL_GPL(gh_rm_unregister_notifier); + +static struct gunyah_device *gh_msgq_platform_probe_direction(struct platform_device *pdev, + u8 gh_type, int idx) +{ + int irq, ret; + u64 capid; + struct device_node *node = pdev->dev.of_node; + struct gunyah_device *ghdev; + + irq = platform_get_irq(pdev, idx); + if (irq < 0) { + dev_err(&pdev->dev, "Failed to get irq%d: %d\n", idx, irq); + return ERR_PTR(irq); + } + + ret = of_property_read_u64_index(node, "reg", idx, &capid); + if (ret) { + dev_err(&pdev->dev, "Failed to get capid%d: %d\n", idx, ret); + return ERR_PTR(ret); + } + + ghdev = gunyah_device_alloc(&pdev->dev, capid, gh_type); + ghdev->irq = irq; + ret = gunyah_device_add(ghdev); + if (ret) { + kfree(ghdev); + return ERR_PTR(ret); + } + + return ghdev; +} + +static int gh_rm_drv_probe(struct platform_device *pdev) +{ + struct gh_rsc_mgr *rsc_mgr; + int ret; + + rsc_mgr = devm_kzalloc(&pdev->dev, sizeof(*rsc_mgr), GFP_KERNEL); + if (!rsc_mgr) + return -ENOMEM; + platform_set_drvdata(pdev, rsc_mgr); + + mutex_init(&rsc_mgr->call_idr_lock); + idr_init(&rsc_mgr->call_idr); + mutex_init(&rsc_mgr->send_lock); + + rsc_mgr->msgq_tx = gh_msgq_platform_probe_direction(pdev, GUNYAH_DEVICE_TYPE_MSGQ_TX, 0); + if (IS_ERR(rsc_mgr->msgq_tx)) + return PTR_ERR(rsc_mgr->msgq_tx); + rsc_mgr->msgq_rx = gh_msgq_platform_probe_direction(pdev, GUNYAH_DEVICE_TYPE_MSGQ_RX, 1); + if (IS_ERR(rsc_mgr->msgq_rx)) { + ret = PTR_ERR(rsc_mgr->msgq_rx); + goto err_msgq_tx; + } + + rsc_mgr->recv_task = kthread_run(gh_rm_recv_task_fn, rsc_mgr, "gh_rm_recv_task"); + if (IS_ERR_OR_NULL(rsc_mgr->recv_task)) { + ret = PTR_ERR(rsc_mgr->recv_task); + goto err_msgq; + } + + __rsc_mgr = rsc_mgr; + + return 0; + +err_msgq: + gunyah_device_remove(rsc_mgr->msgq_rx); +err_msgq_tx: + gunyah_device_remove(rsc_mgr->msgq_tx); + return ret; +} + +static int gh_rm_drv_remove(struct platform_device *pdev) +{ + struct gh_rsc_mgr *rsc_mgr = platform_get_drvdata(pdev); + + gunyah_device_remove(rsc_mgr->msgq_tx); + gunyah_device_remove(rsc_mgr->msgq_rx); + + return 0; +} + +static const struct of_device_id gh_rm_of_match[] = { + { .compatible = "gunyah-resource-manager" }, + { } +}; +MODULE_DEVICE_TABLE(of, gh_rm_of_match); + +static struct platform_driver gh_rsc_mgr_driver = { + .probe = gh_rm_drv_probe, + .remove = gh_rm_drv_remove, + .driver = { + .name = "gh_rsc_mgr", + .of_match_table = gh_rm_of_match, + }, +}; + +int __init gh_rsc_mgr_init(void) +{ + return platform_driver_register(&gh_rsc_mgr_driver); +} + +void gh_rsc_mgr_exit(void) +{ + platform_driver_unregister(&gh_rsc_mgr_driver); +} diff --git a/drivers/virt/gunyah/rsc_mgr.h b/drivers/virt/gunyah/rsc_mgr.h new file mode 100644 index 000000000000..e4f2499267bf --- /dev/null +++ b/drivers/virt/gunyah/rsc_mgr.h @@ -0,0 +1,34 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* + * Copyright (c) 2022 Qualcomm Innovation Center, Inc. All rights reserved. + */ +#ifndef __GH_RSC_MGR_PRIV_H +#define __GH_RSC_MGR_PRIV_H + +#include + +/* RM Error codes */ +#define GH_RM_ERROR_OK 0x0 +#define GH_RM_ERROR_UNIMPLEMENTED 0xFFFFFFFF +#define GH_RM_ERROR_NOMEM 0x1 +#define GH_RM_ERROR_NORESOURCE 0x2 +#define GH_RM_ERROR_DENIED 0x3 +#define GH_RM_ERROR_INVALID 0x4 +#define GH_RM_ERROR_BUSY 0x5 +#define GH_RM_ERROR_ARGUMENT_INVALID 0x6 +#define GH_RM_ERROR_HANDLE_INVALID 0x7 +#define GH_RM_ERROR_VALIDATE_FAILED 0x8 +#define GH_RM_ERROR_MAP_FAILED 0x9 +#define GH_RM_ERROR_MEM_INVALID 0xA +#define GH_RM_ERROR_MEM_INUSE 0xB +#define GH_RM_ERROR_MEM_RELEASED 0xC +#define GH_RM_ERROR_VMID_INVALID 0xD +#define GH_RM_ERROR_LOOKUP_FAILED 0xE +#define GH_RM_ERROR_IRQ_INVALID 0xF +#define GH_RM_ERROR_IRQ_INUSE 0x10 +#define GH_RM_ERROR_IRQ_RELEASED 0x11 + +int gh_rm_call(u32 message_id, void *req_buff, size_t req_buff_size, + void **resp_buf, size_t *resp_buff_size); + +#endif diff --git a/drivers/virt/gunyah/sysfs.c b/drivers/virt/gunyah/sysfs.c index 7589689e5e92..7c0efc80f85e 100644 --- a/drivers/virt/gunyah/sysfs.c +++ b/drivers/virt/gunyah/sysfs.c @@ -148,7 +148,13 @@ static int __init gunyah_init(void) if (ret) goto err_bus; + ret = gh_rsc_mgr_init(); + if (ret) + goto err_msgq; + return ret; +err_msgq: + gh_msgq_exit(); err_bus: gunyah_bus_exit(); err_sysfs: @@ -159,6 +165,7 @@ module_init(gunyah_init); static void __exit gunyah_exit(void) { + gh_rsc_mgr_exit(); gh_msgq_exit(); gunyah_bus_exit(); gh_sysfs_unregister(); diff --git a/include/linux/gunyah_rsc_mgr.h b/include/linux/gunyah_rsc_mgr.h new file mode 100644 index 000000000000..015bd851e1a3 --- /dev/null +++ b/include/linux/gunyah_rsc_mgr.h @@ -0,0 +1,29 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* + * Copyright (c) 2022 Qualcomm Innovation Center, Inc. All rights reserved. + */ + +#ifndef _GUNYAH_RSC_MGR_H +#define _GUNYAH_RSC_MGR_H + +#include +#include +#include + +typedef u16 gh_vmid_t; +typedef u32 gh_virq_handle_t; + +#define GH_VMID_INVAL U16_MAX + +/* Gunyah recognizes VMID0 as an alias to the current VM's ID */ +#define GH_VMID_SELF 0 + +struct gh_rm_notification { + const void *buff; + const size_t size; +}; + +int gh_rm_register_notifier(struct notifier_block *nb); +int gh_rm_unregister_notifier(struct notifier_block *nb); + +#endif