From patchwork Fri Jan 20 22:46:08 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Elliot Berman X-Patchwork-Id: 645105 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 8FBDCC05027 for ; Fri, 20 Jan 2023 22:48:45 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229969AbjATWsm (ORCPT ); Fri, 20 Jan 2023 17:48:42 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:56566 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230084AbjATWsb (ORCPT ); Fri, 20 Jan 2023 17:48:31 -0500 Received: from mx0a-0031df01.pphosted.com (mx0a-0031df01.pphosted.com [205.220.168.131]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 6A62A66FA0; Fri, 20 Jan 2023 14:48:08 -0800 (PST) Received: from pps.filterd (m0279866.ppops.net [127.0.0.1]) by mx0a-0031df01.pphosted.com (8.17.1.19/8.17.1.19) with ESMTP id 30KMZXXu022939; Fri, 20 Jan 2023 22:47:44 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=quicinc.com; h=from : to : cc : subject : date : message-id : in-reply-to : references : mime-version : content-transfer-encoding : content-type; s=qcppdkim1; bh=4X74yKIrLrqF+b1pUTzOb8tH+X7zRbJn3cEBM2UgYuE=; b=InuzS6CStbayoHiw4f18cxVgHS0Lz/MHEDamS115sQ2xm05/HwG3ltC6efVD4jVcbL/7 nNjP/2twik6Wc2G4n/ttamgRTe7RA9OQ7hE4HFRdLCLPgau8nf1sBvsqYYC3LjYrC/4h dBJ7lJMJcVN43Ls+Q2b1+g0C6DTmrMjbLSWd+Ghc6rTsFB/VBOujW1a0DKeJ0iMeRNQd Zki5VR7Jrkt8st8CmSeifnKje0e7/5JSGw+3x5O6hwhM47Mjd/fPqXfdHkhZ6ouBL6eY 1bxqHp1db+ktGgehHuGQ+f7Q9tTi9epwJdhsfmUtMJ/bBuPhBd6qXMoqrtZhkRytn3Nr 3w== Received: from nasanppmta02.qualcomm.com (i-global254.qualcomm.com [199.106.103.254]) by mx0a-0031df01.pphosted.com (PPS) with ESMTPS id 3n7yc60gh1-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Fri, 20 Jan 2023 22:47:43 +0000 Received: from nasanex01b.na.qualcomm.com (nasanex01b.na.qualcomm.com [10.46.141.250]) by NASANPPMTA02.qualcomm.com (8.17.1.5/8.17.1.5) with ESMTPS id 30KMlhDB027197 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Fri, 20 Jan 2023 22:47:43 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 14:47:42 -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 09/27] gunyah: rsc_mgr: Add resource manager RPC core Date: Fri, 20 Jan 2023 14:46:08 -0800 Message-ID: <20230120224627.4053418-10-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: Yaarz7o1gMZecAiR7JQ4DD_2dcT_0Cjn X-Proofpoint-ORIG-GUID: Yaarz7o1gMZecAiR7JQ4DD_2dcT_0Cjn 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 mlxscore=0 priorityscore=1501 spamscore=0 impostorscore=0 phishscore=0 clxscore=1015 mlxlogscore=999 adultscore=0 malwarescore=0 bulkscore=0 suspectscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2212070000 definitions=main-2301200218 Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.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 | 3 + drivers/virt/gunyah/rsc_mgr.c | 616 +++++++++++++++++++++++++++++++++ drivers/virt/gunyah/rsc_mgr.h | 71 ++++ include/linux/gunyah.h | 3 +- include/linux/gunyah_rsc_mgr.h | 18 + 7 files changed, 710 insertions(+), 4 deletions(-) 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 d02e8abe6457..7ab1462577cc 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -9051,7 +9051,7 @@ F: Documentation/virt/gunyah/ F: arch/arm64/gunyah/ F: drivers/mailbox/gunyah-msgq.c 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 71c38845bcea..1a737694c333 100644 --- a/drivers/virt/gunyah/Kconfig +++ b/drivers/virt/gunyah/Kconfig @@ -4,7 +4,6 @@ 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 diff --git a/drivers/virt/gunyah/Makefile b/drivers/virt/gunyah/Makefile index 34f32110faf9..cc864ff5abbb 100644 --- a/drivers/virt/gunyah/Makefile +++ b/drivers/virt/gunyah/Makefile @@ -1,3 +1,6 @@ # SPDX-License-Identifier: GPL-2.0 obj-$(CONFIG_GUNYAH) += gunyah.o + +gunyah_rsc_mgr-y += rsc_mgr.o +obj-$(CONFIG_GUNYAH) += gunyah_rsc_mgr.o diff --git a/drivers/virt/gunyah/rsc_mgr.c b/drivers/virt/gunyah/rsc_mgr.c new file mode 100644 index 000000000000..382f9943fd31 --- /dev/null +++ b/drivers/virt/gunyah/rsc_mgr.c @@ -0,0 +1,616 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright (c) 2022-2023 Qualcomm Innovation Center, Inc. All rights reserved. + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include "rsc_mgr.h" + +#define RM_RPC_API_VERSION_MASK GENMASK(3, 0) +#define RM_RPC_HEADER_WORDS_MASK GENMASK(7, 4) +#define RM_RPC_API_VERSION FIELD_PREP(RM_RPC_API_VERSION_MASK, 1) +#define RM_RPC_HEADER_WORDS FIELD_PREP(RM_RPC_HEADER_WORDS_MASK, \ + (sizeof(struct gh_rm_rpc_hdr) / sizeof(u32))) +#define RM_RPC_API (RM_RPC_API_VERSION | RM_RPC_HEADER_WORDS) + +#define RM_RPC_TYPE_CONTINUATION 0x0 +#define RM_RPC_TYPE_REQUEST 0x1 +#define RM_RPC_TYPE_REPLY 0x2 +#define RM_RPC_TYPE_NOTIF 0x3 +#define RM_RPC_TYPE_MASK GENMASK(1, 0) + +#define GH_RM_MAX_NUM_FRAGMENTS 62 +#define RM_RPC_FRAGMENTS_MASK GENMASK(7, 2) + +struct gh_rm_rpc_hdr { + u8 api; + u8 type; + __le16 seq; + __le32 msg_id; +} __packed; + +struct gh_rm_rpc_reply_hdr { + struct gh_rm_rpc_hdr rpc_hdr; + __le32 err_code; /* GH_RM_ERROR_* */ +} __packed; + +#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 (msg headers stripped off). + * @size: Size of the payload received so far. + * @ret: Linux return code, set in case there was an error processing connection + * @msg_id: Message ID from the header. + * @type: RM_RPC_TYPE_REPLY or RM_RPC_TYPE_NOTIF. + * @num_fragments: total number of fragments expected to be received. + * @fragments_received: fragments received so far. + * @rm_error: For request/reply sequences with standard replies. + * @seq: Sequence ID for the main message. + * @seq_done: Signals caller that the RM reply has been received + */ +struct gh_rm_connection { + void *payload; + size_t size; + __le32 msg_id; + u8 type; + + u8 num_fragments; + u8 fragments_received; + + union { + struct { + /* only for req/reply sequence */ + int ret; + u16 seq; + u32 rm_error; /* GH_RM_ERROR_* */ + struct completion seq_done; + } reply; + + struct { + struct work_struct work; + } notification; + }; +}; + +struct gh_rm_notif_complete { + struct gh_rm_connection *conn; + struct work_struct work; +}; + +struct gh_rm { + struct device *dev; + struct gunyah_resource tx_ghrsc, rx_ghrsc; + struct gh_msgq msgq; + struct mbox_client msgq_client; + struct gh_rm_connection *active_rx_connection; + int last_tx_ret; + + struct idr call_idr; + struct mutex call_idr_lock; + + struct kmem_cache *cache; + struct mutex send_lock; + + struct work_struct recv_work; +}; + +static struct gh_rm_connection *gh_rm_alloc_connection(__le32 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; +} + +static int gh_rm_init_connection_payload(struct gh_rm_connection *connection, void *msg, + size_t hdr_size, size_t msg_size) +{ + struct gh_rm_rpc_hdr *hdr = msg; + size_t max_buf_size, payload_size; + + if (hdr_size > msg_size) + return -EINVAL; + + payload_size = msg_size - hdr_size; + + connection->num_fragments = FIELD_GET(RM_RPC_FRAGMENTS_MASK, hdr->type); + connection->fragments_received = 0; + + /* There's not going to be any payload, no need to allocate buffer. */ + if (!payload_size && !connection->num_fragments) + return 0; + + if (connection->num_fragments > GH_RM_MAX_NUM_FRAGMENTS) + return -EINVAL; + + max_buf_size = payload_size + (connection->num_fragments * GH_RM_MAX_MSG_SIZE); + + 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_connection *connection = container_of(work, struct gh_rm_connection, + notification.work); + + /* No users of notifications, yet. */ + + kfree(connection->payload); + kfree(connection); +} + +static struct gh_rm_connection *gh_rm_process_notif(struct gh_rm *rm, void *msg, size_t msg_size) +{ + struct gh_rm_rpc_hdr *hdr = msg; + struct gh_rm_connection *connection; + int ret; + + connection = gh_rm_alloc_connection(hdr->msg_id, RM_RPC_TYPE_NOTIF); + if (!connection) { + dev_err(rm->dev, "Failed to alloc connection for notification, dropping.\n"); + return NULL; + } + + INIT_WORK(&connection->notification.work, gh_rm_notif_work); + + ret = gh_rm_init_connection_payload(connection, msg, sizeof(*hdr), msg_size); + if (ret) { + dev_err(rm->dev, "Failed to initialize connection buffer for notification: %d\n", + ret); + kfree(connection); + return NULL; + } + + return connection; +} + +static struct gh_rm_connection *gh_rm_process_rply(struct gh_rm *rm, void *msg, size_t msg_size) +{ + struct gh_rm_rpc_reply_hdr *reply_hdr = msg; + struct gh_rm_rpc_hdr *hdr = &reply_hdr->rpc_hdr; + struct gh_rm_connection *connection; + u16 seq_id = le16_to_cpu(hdr->seq); + + mutex_lock(&rm->call_idr_lock); + connection = idr_find(&rm->call_idr, seq_id); + mutex_unlock(&rm->call_idr_lock); + + if (!connection) { + dev_err(rm->dev, "Failed to find connection for sequence %u\n", seq_id); + return NULL; + } + if (connection->msg_id != hdr->msg_id) { + dev_err(rm->dev, "Reply for sequence %u expected msg_id: %x but got %x\n", + seq_id, le32_to_cpu(connection->msg_id), le32_to_cpu(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)) { + dev_err(rm->dev, "Failed to alloc connection buffer for sequence %d\n", seq_id); + /* Send connection complete and error the client. */ + connection->reply.ret = -ENOMEM; + complete(&connection->reply.seq_done); + return NULL; + } + + connection->reply.rm_error = le32_to_cpu(reply_hdr->err_code); + return connection; +} + +static int gh_rm_process_cont(struct gh_rm *rm, 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. To detect mishandling, check it's still intact. + */ + if (connection->msg_id != hdr->msg_id) { + dev_err(rm->dev, "Appending mismatched continuation with id %d to connection with id %d\n", + le32_to_cpu(hdr->msg_id), le32_to_cpu(connection->msg_id)); + return -EINVAL; + } + if (connection->num_fragments != FIELD_GET(RM_RPC_FRAGMENTS_MASK, hdr->type)) { + dev_err(rm->dev, "Number of fragments mismatch for message %x\n", + le32_to_cpu(hdr->msg_id)); + return -EINVAL; + } + + memcpy(connection->payload + connection->size, msg + sizeof(*hdr), payload_size); + connection->size += payload_size; + connection->fragments_received++; + return 0; +} + +static bool gh_rm_complete_connection(struct gh_rm *rm, struct gh_rm_connection *connection) +{ + if (!connection) + return false; + + if (connection->fragments_received != connection->num_fragments) + return false; + + switch (connection->type) { + case RM_RPC_TYPE_REPLY: + complete(&connection->reply.seq_done); + break; + case RM_RPC_TYPE_NOTIF: + schedule_work(&connection->notification.work); + break; + default: + dev_err(rm->dev, "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 RM_RPC_TYPE_REPLY: + connection->reply.ret = -EIO; + complete(&connection->reply.seq_done); + break; + case RM_RPC_TYPE_NOTIF: + fallthrough; + default: + kfree(connection->payload); + kfree(connection); + } +} + +static void gh_rm_msgq_rx_data(struct mbox_client *cl, void *mssg) +{ + struct gh_rm *rm = container_of(cl, struct gh_rm, msgq_client); + struct gh_msgq_rx_data *rx_data = mssg; + void *msg = rx_data->data; + size_t msg_size = rx_data->length; + struct gh_rm_rpc_hdr *hdr; + + if (msg_size <= sizeof(struct gh_rm_rpc_hdr)) { + dev_err(rm->dev, "Incomplete message size: %ld is too small\n", msg_size); + return; + } + + hdr = msg; + if (hdr->api != RM_RPC_API) { + dev_err(rm->dev, "Unknown RM RPC API version: %x\n", hdr->api); + return; + } + + if (msg_size > GH_MSGQ_MAX_MSG_SIZE) { + dev_err(rm->dev, "Unexpected large message received: %ld\n", msg_size); + return; + } + + switch (FIELD_GET(RM_RPC_TYPE_MASK, hdr->type)) { + case RM_RPC_TYPE_NOTIF: + if (rm->active_rx_connection) { + /* Not possible per protocol. Do something better than BUG_ON */ + dev_err(rm->dev, "Received start of new notification without finishing existing message series.\n"); + gh_rm_abort_connection(rm->active_rx_connection); + } + rm->active_rx_connection = gh_rm_process_notif(rm, msg, msg_size); + break; + case RM_RPC_TYPE_REPLY: + if (rm->active_rx_connection) { + /* Not possible per protocol. Do something better than BUG_ON */ + dev_err(rm->dev, "Received start of new reply without finishing existing message series.\n"); + gh_rm_abort_connection(rm->active_rx_connection); + } + rm->active_rx_connection = gh_rm_process_rply(rm, msg, msg_size); + break; + case RM_RPC_TYPE_CONTINUATION: + if (!rm->active_rx_connection) { + dev_err(rm->dev, "Received a continuation message without receiving initial message\n"); + break; + } + if (gh_rm_process_cont(rm, rm->active_rx_connection, msg, msg_size)) { + gh_rm_abort_connection(rm->active_rx_connection); + rm->active_rx_connection = NULL; + } + break; + default: + dev_err(rm->dev, "Invalid message type (%lu) received\n", + FIELD_GET(RM_RPC_TYPE_MASK, hdr->type)); + return; + } + + if (gh_rm_complete_connection(rm, rm->active_rx_connection)) + rm->active_rx_connection = NULL; +} + +static void gh_rm_msgq_tx_done(struct mbox_client *cl, void *mssg, int r) +{ + struct gh_rm *rm = container_of(cl, struct gh_rm, msgq_client); + + kmem_cache_free(rm->cache, mssg); + rm->last_tx_ret = r; +} + +static int gh_rm_send_request(struct gh_rm *rm, 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; + u32 cont_fragments = 0; + struct gh_rm_rpc_hdr *hdr; + struct gh_msgq_tx_data *msg; + u8 msg_type = FIELD_PREP(RM_RPC_TYPE_MASK, RM_RPC_TYPE_REQUEST); + void *payload; + size_t payload_size; + const void *req_buff_curr = req_buff; + int ret; + + if (req_buff_size) + cont_fragments = (req_buff_size - 1) / GH_RM_MAX_MSG_SIZE; + + if (req_buff_size > GH_RM_MAX_NUM_FRAGMENTS * GH_RM_MAX_MSG_SIZE) { + pr_warn("Limit exceeded for the number of fragments: %u\n", cont_fragments); + dump_stack(); + return -E2BIG; + } + + ret = mutex_lock_interruptible(&rm->send_lock); + if (ret) + return ret; + + /* Consider also the 'request' packet for the loop count */ + do { + msg = kmem_cache_zalloc(rm->cache, GFP_KERNEL); + if (!msg) { + ret = -ENOMEM; + goto out; + } + + /* Fill header */ + hdr = (struct gh_rm_rpc_hdr *)msg->data; + hdr->api = RM_RPC_API; + hdr->type = msg_type | FIELD_PREP(RM_RPC_FRAGMENTS_MASK, cont_fragments); + hdr->seq = cpu_to_le16(connection->reply.seq); + hdr->msg_id = cpu_to_le32(message_id); + + /* Copy payload */ + payload = hdr + 1; + payload_size = min(buff_size_remaining, GH_RM_MAX_MSG_SIZE); + memcpy(payload, req_buff_curr, payload_size); + req_buff_curr += payload_size; + buff_size_remaining -= payload_size; + + /* Force the last fragment to immediately alert the receiver */ + msg->push = !buff_size_remaining; + msg->length = sizeof(*hdr) + payload_size; + + ret = mbox_send_message(gh_msgq_chan(&rm->msgq), msg); + if (ret < 0) { + kmem_cache_free(rm->cache, msg); + break; + } + + if (rm->last_tx_ret) { + ret = rm->last_tx_ret; + break; + } + + msg_type = FIELD_PREP(RM_RPC_TYPE_MASK, RM_RPC_TYPE_CONTINUATION); + } while (buff_size_remaining); + +out: + mutex_unlock(&rm->send_lock); + return ret < 0 ? ret : 0; +} + +/** + * gh_rm_call: Achieve request-response type communication with RPC + * @rm: Pointer to Gunyah resource manager internal data + * @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 + * + * 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. + * + * req_buff should be not NULL for req_buff_size >0. If req_buff_size == 0, + * req_buff *can* be NULL and no additional payload is sent. + * + * Context: Process context. Will sleep waiting for reply. + * Return: 0 on success. <0 if error. + */ +int gh_rm_call(struct gh_rm *rm, 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; + + /* message_id 0 is reserved. req_buff_size implies req_buf is not NULL */ + if (!message_id || (!req_buff && req_buff_size)) + return -EINVAL; + + if (!rm) + return -EPROBE_DEFER; + + connection = gh_rm_alloc_connection(cpu_to_le32(message_id), RM_RPC_TYPE_REPLY); + if (!connection) + return -ENOMEM; + + init_completion(&connection->reply.seq_done); + + /* Allocate a new seq number for this connection */ + mutex_lock(&rm->call_idr_lock); + ret = idr_alloc_cyclic(&rm->call_idr, connection, 0, U16_MAX, + GFP_KERNEL); + mutex_unlock(&rm->call_idr_lock); + if (ret < 0) + goto out; + connection->reply.seq = ret; + + /* Send the request to the Resource Manager */ + ret = gh_rm_send_request(rm, message_id, req_buff, req_buff_size, connection); + if (ret < 0) + goto out; + + /* Wait for response */ + ret = wait_for_completion_interruptible(&connection->reply.seq_done); + if (ret) + goto out; + + /* Check for internal (kernel) error waiting for the response */ + if (connection->reply.ret) { + ret = connection->reply.ret; + kfree(connection->payload); + goto out; + } + + /* Got a response, did resource manager give us an error? */ + if (connection->reply.rm_error) { + pr_warn("RM rejected message %08x. Error: %d\n", message_id, + connection->reply.rm_error); + dump_stack(); + ret = gh_rm_remap_error(connection->reply.rm_error); + kfree(connection->payload); + goto out; + } + + /* Everything looks good, return the payload */ + *resp_buff_size = connection->size; + if (connection->size) + *resp_buf = connection->payload; + else { + /* kfree in case RM sent us multiple fragments but never any data in + * those fragments. We would've allocated memory for it, but connection->size == 0 + */ + kfree(connection->payload); + } + +out: + mutex_lock(&rm->call_idr_lock); + idr_remove(&rm->call_idr, connection->reply.seq); + mutex_unlock(&rm->call_idr_lock); + kfree(connection); + return ret; +} + +static int gh_msgq_platform_probe_direction(struct platform_device *pdev, + bool tx, int idx, struct gunyah_resource *ghrsc) +{ + int ret; + struct device_node *node = pdev->dev.of_node; + + ghrsc->type = tx ? GUNYAH_RESOURCE_TYPE_MSGQ_TX : GUNYAH_RESOURCE_TYPE_MSGQ_RX; + + ghrsc->irq = platform_get_irq(pdev, idx); + if (ghrsc->irq < 0) { + dev_err(&pdev->dev, "Failed to get irq%d: %d\n", idx, ghrsc->irq); + return ghrsc->irq; + } + + ret = of_property_read_u64_index(node, "reg", idx, &ghrsc->capid); + if (ret) { + dev_err(&pdev->dev, "Failed to get capid%d: %d\n", idx, ret); + return ret; + } + + return 0; +} + +static int gh_rm_drv_probe(struct platform_device *pdev) +{ + struct gh_rm *rm; + int ret; + + rm = devm_kzalloc(&pdev->dev, sizeof(*rm), GFP_KERNEL); + if (!rm) + return -ENOMEM; + + platform_set_drvdata(pdev, rm); + rm->dev = &pdev->dev; + + mutex_init(&rm->call_idr_lock); + idr_init(&rm->call_idr); + rm->cache = kmem_cache_create("gh_rm", struct_size(msg, data, GH_MSGQ_MAX_MSG_SIZE), 0, + SLAB_HWCACHE_ALIGN, NULL); + if (!rm->cache) + return -ENOMEM; + mutex_init(&rm->send_lock); + + ret = gh_msgq_platform_probe_direction(pdev, true, 0, &rm->tx_ghrsc); + if (ret) + goto err_cache; + + ret = gh_msgq_platform_probe_direction(pdev, false, 1, &rm->rx_ghrsc); + if (ret) + goto err_cache; + + rm->msgq_client.dev = &pdev->dev; + rm->msgq_client.tx_block = true; + rm->msgq_client.rx_callback = gh_rm_msgq_rx_data; + rm->msgq_client.tx_done = gh_rm_msgq_tx_done; + + return gh_msgq_init(&pdev->dev, &rm->msgq, &rm->msgq_client, &rm->tx_ghrsc, &rm->rx_ghrsc); +} + +static int gh_rm_drv_remove(struct platform_device *pdev) +{ + struct gh_rm *rm = platform_get_drvdata(pdev); + + mbox_free_channel(gh_msgq_chan(&rm->msgq)); + gh_msgq_remove(&rm->msgq); + kmem_cache_destroy(rm->cache); + + 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_rm_driver = { + .probe = gh_rm_drv_probe, + .remove = gh_rm_drv_remove, + .driver = { + .name = "gh_rsc_mgr", + .of_match_table = gh_rm_of_match, + }, +}; +module_platform_driver(gh_rm_driver); + +MODULE_LICENSE("GPL"); +MODULE_DESCRIPTION("Gunyah Resource Manager Driver"); diff --git a/drivers/virt/gunyah/rsc_mgr.h b/drivers/virt/gunyah/rsc_mgr.h new file mode 100644 index 000000000000..824749e63a54 --- /dev/null +++ b/drivers/virt/gunyah/rsc_mgr.h @@ -0,0 +1,71 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* + * Copyright (c) 2022-2023 Qualcomm Innovation Center, Inc. All rights reserved. + */ +#ifndef __GH_RSC_MGR_PRIV_H +#define __GH_RSC_MGR_PRIV_H + +#include +#include +#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 + +static inline int gh_rm_remap_error(int rm_error) +{ + switch (rm_error) { + case GH_RM_ERROR_OK: + return 0; + case GH_RM_ERROR_UNIMPLEMENTED: + return -EOPNOTSUPP; + case GH_RM_ERROR_NOMEM: + return -ENOMEM; + case GH_RM_ERROR_NORESOURCE: + return -ENODEV; + case GH_RM_ERROR_DENIED: + return -EPERM; + case GH_RM_ERROR_BUSY: + return -EBUSY; + case GH_RM_ERROR_INVALID: + case GH_RM_ERROR_ARGUMENT_INVALID: + case GH_RM_ERROR_HANDLE_INVALID: + case GH_RM_ERROR_VALIDATE_FAILED: + case GH_RM_ERROR_MAP_FAILED: + case GH_RM_ERROR_MEM_INVALID: + case GH_RM_ERROR_MEM_INUSE: + case GH_RM_ERROR_MEM_RELEASED: + case GH_RM_ERROR_VMID_INVALID: + case GH_RM_ERROR_LOOKUP_FAILED: + case GH_RM_ERROR_IRQ_INVALID: + case GH_RM_ERROR_IRQ_INUSE: + case GH_RM_ERROR_IRQ_RELEASED: + return -EINVAL; + default: + return -EBADMSG; + } +} + +struct gh_rm; +int gh_rm_call(struct gh_rm *rsc_mgr, u32 message_id, void *req_buff, size_t req_buff_size, + void **resp_buf, size_t *resp_buff_size); + +#endif diff --git a/include/linux/gunyah.h b/include/linux/gunyah.h index 5d6fc9f88718..91d2c9f5b2f0 100644 --- a/include/linux/gunyah.h +++ b/include/linux/gunyah.h @@ -119,12 +119,11 @@ static inline int gh_remap_error(int gh_error) return -EACCES; case GH_ERROR_BUSY: case GH_ERROR_IDLE: - return -EBUSY; case GH_ERROR_IRQ_BOUND: case GH_ERROR_IRQ_UNBOUND: case GH_ERROR_MSGQUEUE_FULL: case GH_ERROR_MSGQUEUE_EMPTY: - return -EPERM; + return -EBUSY; default: return -EINVAL; } diff --git a/include/linux/gunyah_rsc_mgr.h b/include/linux/gunyah_rsc_mgr.h new file mode 100644 index 000000000000..959787ad0a3d --- /dev/null +++ b/include/linux/gunyah_rsc_mgr.h @@ -0,0 +1,18 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* + * Copyright (c) 2022-2023 Qualcomm Innovation Center, Inc. All rights reserved. + */ + +#ifndef _GUNYAH_RSC_MGR_H +#define _GUNYAH_RSC_MGR_H + +#include +#include +#include + +#define GH_VMID_INVAL U16_MAX + +/* Gunyah recognizes VMID0 as an alias to the current VM's ID */ +#define GH_VMID_SELF 0 + +#endif