From patchwork Tue May 19 14:14:01 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jeffrey Hugo X-Patchwork-Id: 189078 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-9.6 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH, MAILING_LIST_MULTI, SIGNED_OFF_BY, SPF_HELO_NONE, SPF_PASS, URIBL_BLOCKED, USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id A8F5AC433E0 for ; Tue, 19 May 2020 14:15:10 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 81D4E20835 for ; Tue, 19 May 2020 14:15:10 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (1024-bit key) header.d=mg.codeaurora.org header.i=@mg.codeaurora.org header.b="Qi7b1NWh" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729102AbgESOOv (ORCPT ); Tue, 19 May 2020 10:14:51 -0400 Received: from mail26.static.mailgun.info ([104.130.122.26]:58472 "EHLO mail26.static.mailgun.info" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728965AbgESOOs (ORCPT ); Tue, 19 May 2020 10:14:48 -0400 DKIM-Signature: a=rsa-sha256; v=1; c=relaxed/relaxed; d=mg.codeaurora.org; q=dns/txt; s=smtp; t=1589897686; h=References: In-Reply-To: Message-Id: Date: Subject: Cc: To: From: Sender; bh=Nvt/gjLmtfC06smpn2Ghl47U3R731TpYR2rLwFvhqZU=; b=Qi7b1NWhgh0/dAXdF+FfNSuVJAYTeYtqT5bJ+fKppAar6H/VToUzOo/j2rFswDPyob5HXwcc RViYEt73A1wVNaN/B62irRpvY4dKHDVLE8ovQOJEIBN+UYrgWvVLWcQ9yyOufgZJoqPlRWRX HEBzvPnaNonM3RNF2L9RVWOXOME= X-Mailgun-Sending-Ip: 104.130.122.26 X-Mailgun-Sid: WyI1MzIzYiIsICJsaW51eC1hcm0tbXNtQHZnZXIua2VybmVsLm9yZyIsICJiZTllNGEiXQ== Received: from smtp.codeaurora.org (ec2-35-166-182-171.us-west-2.compute.amazonaws.com [35.166.182.171]) by mxa.mailgun.org with ESMTP id 5ec3e9c5.7f7943f044c8-smtp-out-n03; Tue, 19 May 2020 14:14:29 -0000 (UTC) Received: by smtp.codeaurora.org (Postfix, from userid 1001) id 1DDD8C432C2; Tue, 19 May 2020 14:14:27 +0000 (UTC) Received: from jhugo-perf-lnx.qualcomm.com (i-global254.qualcomm.com [199.106.103.254]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-SHA256 (128/128 bits)) (No client certificate requested) (Authenticated sender: jhugo) by smtp.codeaurora.org (Postfix) with ESMTPSA id EF04EC433F2; Tue, 19 May 2020 14:14:23 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 smtp.codeaurora.org EF04EC433F2 Authentication-Results: aws-us-west-2-caf-mail-1.web.codeaurora.org; dmarc=none (p=none dis=none) header.from=codeaurora.org Authentication-Results: aws-us-west-2-caf-mail-1.web.codeaurora.org; spf=none smtp.mailfrom=jhugo@codeaurora.org From: Jeffrey Hugo To: arnd@arndb.de, gregkh@linuxfoundation.org Cc: manivannan.sadhasivam@linaro.org, bjorn.andersson@linaro.org, wufan@codeaurora.org, pratanan@codeaurora.org, linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org, Jeffrey Hugo Subject: [RFC v2 PATCH 4/8] qaic: Implement control path Date: Tue, 19 May 2020 08:14:01 -0600 Message-Id: <1589897645-17088-5-git-send-email-jhugo@codeaurora.org> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1589897645-17088-1-git-send-email-jhugo@codeaurora.org> References: <1589897645-17088-1-git-send-email-jhugo@codeaurora.org> Sender: linux-arm-msm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org Once a qaic device is fully booted, the control path is available for use. The control path allows the host to use a MHI channel to send requests to the device. The canonical usecase for the control path is allowing userspace to configure the device for a workload. This is accomplished via the manage ioctl. Signed-off-by: Jeffrey Hugo --- drivers/misc/qaic/Makefile | 3 +- drivers/misc/qaic/qaic.h | 61 +++ drivers/misc/qaic/qaic_control.c | 1012 ++++++++++++++++++++++++++++++++++++++ drivers/misc/qaic/qaic_drv.c | 147 +++++- include/uapi/misc/qaic.h | 117 +++++ 5 files changed, 1328 insertions(+), 12 deletions(-) create mode 100644 drivers/misc/qaic/qaic_control.c create mode 100644 include/uapi/misc/qaic.h diff --git a/drivers/misc/qaic/Makefile b/drivers/misc/qaic/Makefile index b5fd819..7a5513b 100644 --- a/drivers/misc/qaic/Makefile +++ b/drivers/misc/qaic/Makefile @@ -7,4 +7,5 @@ obj-$(CONFIG_QAIC) := qaic.o qaic-y := \ qaic_drv.o \ - mhi_controller.o + mhi_controller.o \ + qaic_control.o diff --git a/drivers/misc/qaic/qaic.h b/drivers/misc/qaic/qaic.h index 7b430cf..641a39b 100644 --- a/drivers/misc/qaic/qaic.h +++ b/drivers/misc/qaic/qaic.h @@ -6,12 +6,22 @@ #ifndef QAICINTERNAL_H_ #define QAICINTERNAL_H_ +#include #include #include #include #include #include +#include #include +#include +#include + +#define QAIC_NUM_DBC 16 +#define QAIC_DBC_BASE 0x20000 +#define QAIC_DBC_SIZE 0x1000 + +#define QAIC_DBC_OFF(i) ((i) * QAIC_DBC_SIZE + QAIC_DBC_BASE) #define QAIC_MDEV_NAME_MAX 25 @@ -23,17 +33,68 @@ struct qaic_user { struct kref ref_count; }; +struct dma_bridge_chan { + struct qaic_device *qdev; + unsigned int id; + /* also the base of the entire memory allocation */ + void *req_q_base; + void *rsp_q_base; + dma_addr_t dma_addr; + u32 total_size; + u32 nelem; + struct mutex mem_lock; + struct idr mem_handles; + struct qaic_user *usr; + u16 next_req_id; + void __iomem *dbc_base; + spinlock_t xfer_lock; + struct list_head xfer_list; + struct srcu_struct ch_lock; + struct dentry *debugfs_root; + bool in_use; + wait_queue_head_t dbc_release; +}; + struct qaic_device { struct pci_dev *pdev; int bars; void __iomem *bar_0; + void __iomem *bar_2; struct mhi_controller *mhi_cntl; struct mhi_device *cntl_ch; + struct list_head cntl_xfer_list; + u32 next_seq_num; + struct mutex cntl_mutex; + bool cntl_lost_buf; struct miscdevice mdev; char mdev_name[QAIC_MDEV_NAME_MAX]; + struct dma_bridge_chan dbc[QAIC_NUM_DBC]; + struct workqueue_struct *cntl_wq; bool in_reset; struct srcu_struct dev_lock; struct list_head users; struct mutex users_mutex; }; + +int get_dbc_req_elem_size(void); +int get_dbc_rsp_elem_size(void); +int get_cntl_version(struct qaic_device *qdev, struct qaic_user *usr, + u16 *major, u16 *minor); +int qaic_manage_ioctl(struct qaic_device *qdev, struct qaic_user *usr, + unsigned long arg); + +void qaic_mhi_ul_xfer_cb(struct mhi_device *mhi_dev, + struct mhi_result *mhi_result); + +void qaic_mhi_dl_xfer_cb(struct mhi_device *mhi_dev, + struct mhi_result *mhi_result); + +int qaic_control_open(struct qaic_device *qdev); +void qaic_control_close(struct qaic_device *qdev); +void qaic_release_usr(struct qaic_device *qdev, struct qaic_user *usr); + +int disable_dbc(struct qaic_device *qdev, u32 dbc_id, struct qaic_user *usr); +void release_dbc(struct qaic_device *qdev, u32 dbc_id); + +void wake_all_cntl(struct qaic_device *qdev); #endif /* QAICINTERNAL_H_ */ diff --git a/drivers/misc/qaic/qaic_control.c b/drivers/misc/qaic/qaic_control.c new file mode 100644 index 0000000..cdba0a9 --- /dev/null +++ b/drivers/misc/qaic/qaic_control.c @@ -0,0 +1,1012 @@ +// SPDX-License-Identifier: GPL-2.0-only + +/* Copyright (c) 2019-2020, The Linux Foundation. All rights reserved. */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include "qaic.h" + +#define MANAGE_MAGIC_NUMBER 0x43494151 /* "QAIC" in little endian */ +#define QAIC_DBC_Q_GAP 0x100 +#define QAIC_DBC_Q_BUF_ALIGN 0x1000 +#define RESP_TIMEOUT (60 * HZ) + +/* + * Wire encoding structures for the manage protocol. + * All fields are little endian on the wire + */ +struct _msg_hdr { + __le32 magic_number; + __le32 sequence_number; + __le32 len; /* length of this message */ + __le32 count; /* number of transactions in this message */ + __le32 handle; /* unique id to track the resources consumed */ +} __packed __aligned(4); + +struct _msg { + struct _msg_hdr hdr; + __u8 data[QAIC_MANAGE_MAX_MSG_LENGTH]; +} __packed __aligned(4); + +struct wrapper_msg { + struct kref ref_count; + struct _msg msg; +}; + +struct _trans_hdr { + __le32 type; + __le32 len; +} __packed __aligned(4); + +struct _trans_passthrough { + struct _trans_hdr hdr; + __u8 data[]; +} __packed __aligned(4); + +struct _addr_size_pair { + __le64 addr; + __le64 size; +} __packed __aligned(8); + +struct _trans_dma_xfer { + struct _trans_hdr hdr; + __le32 tag; + __le32 count; + struct _addr_size_pair data[]; +} __packed __aligned(8); + +struct _trans_activate_to_dev { + struct _trans_hdr hdr; + __le32 buf_len; + __le64 req_q_addr; + __le32 req_q_size; + __le64 rsp_q_addr; + __le32 rsp_q_size; + __le32 reserved; +} __packed __aligned(8); + +struct _trans_activate_from_dev { + struct _trans_hdr hdr; + __le32 status; + __le32 dbc_id; +} __packed __aligned(4); + +struct _trans_deactivate_from_dev { + struct _trans_hdr hdr; + __le32 status; + __le32 dbc_id; +} __packed __aligned(4); + +struct _trans_terminate_to_dev { + struct _trans_hdr hdr; + __le32 handle; +} __packed __aligned(4); + +struct _trans_terminate_from_dev { + struct _trans_hdr hdr; + __le32 status; +} __packed __aligned(4); + +struct _trans_status_to_dev { + struct _trans_hdr hdr; +} __packed __aligned(4); + +struct _trans_status_from_dev { + struct _trans_hdr hdr; + __le16 major; + __le16 minor; + __le32 status; +} __packed __aligned(4); + +struct xfer_queue_elem { + struct list_head list; + u32 seq_num; + struct completion xfer_done; + void *buf; +}; + +struct dma_xfer { + struct list_head list; + struct sg_table *sgt; + struct page **page_list; + unsigned long nr_pages; +}; + +struct ioctl_resources { + struct list_head dma_xfers; + void *buf; + dma_addr_t dma_addr; + u32 total_size; + u32 nelem; + void *rsp_q_base; + u32 status; + u32 dbc_id; +}; + +struct resp_work { + struct work_struct work; + struct qaic_device *qdev; + void *buf; +}; + +static void free_wrapper(struct kref *ref) +{ + struct wrapper_msg *wrapper = container_of(ref, struct wrapper_msg, + ref_count); + + kfree(wrapper); +} + +static void save_dbc_buf(struct qaic_device *qdev, + struct ioctl_resources *resources, + struct qaic_user *usr) +{ + u32 dbc_id = resources->dbc_id; + + if (resources->buf) { + wait_event_interruptible(qdev->dbc[dbc_id].dbc_release, + !qdev->dbc[dbc_id].in_use); + qdev->dbc[dbc_id].req_q_base = resources->buf; + qdev->dbc[dbc_id].rsp_q_base = resources->rsp_q_base; + qdev->dbc[dbc_id].dma_addr = resources->dma_addr; + qdev->dbc[dbc_id].total_size = resources->total_size; + qdev->dbc[dbc_id].nelem = resources->nelem; + qdev->dbc[dbc_id].usr = usr; + qdev->dbc[dbc_id].in_use = true; + resources->buf = NULL; + } +} + +static void free_dbc_buf(struct qaic_device *qdev, + struct ioctl_resources *resources) +{ + if (resources->buf) + dma_free_coherent(&qdev->pdev->dev, resources->total_size, + resources->buf, resources->dma_addr); + resources->buf = NULL; +} + +static void free_dma_xfers(struct qaic_device *qdev, + struct ioctl_resources *resources) +{ + struct dma_xfer *xfer; + struct dma_xfer *x; + int i; + + list_for_each_entry_safe(xfer, x, &resources->dma_xfers, list) { + dma_unmap_sg(&qdev->pdev->dev, xfer->sgt->sgl, xfer->sgt->nents, + DMA_TO_DEVICE); + sg_free_table(xfer->sgt); + kfree(xfer->sgt); + for (i = 0; i < xfer->nr_pages; ++i) + put_page(xfer->page_list[i]); + kfree(xfer->page_list); + list_del(&xfer->list); + kfree(xfer); + } +} + +static int encode_passthrough(struct qaic_device *qdev, void *trans, + struct _msg *msg, u32 *user_len) +{ + struct qaic_manage_trans_passthrough *in_trans = trans; + struct _trans_passthrough *out_trans = (void *)msg + msg->hdr.len; + + if (msg->hdr.len + in_trans->hdr.len > sizeof(*msg)) + return -ENOSPC; + + memcpy(out_trans, in_trans, in_trans->hdr.len); + msg->hdr.len += in_trans->hdr.len; + *user_len += in_trans->hdr.len; + out_trans->hdr.type = cpu_to_le32(TRANS_PASSTHROUGH_TO_DEV); + out_trans->hdr.len = cpu_to_le32(out_trans->hdr.len); + + return 0; +} + +static int encode_dma(struct qaic_device *qdev, void *trans, struct _msg *msg, + u32 *user_len, struct ioctl_resources *resources) +{ + struct qaic_manage_trans_dma_xfer *in_trans = trans; + struct _trans_dma_xfer *out_trans = (void *)msg + msg->hdr.len; + struct dma_xfer *xfer; + unsigned long nr_pages; + struct page **page_list; + struct scatterlist *last; + struct scatterlist *sg; + struct sg_table *sgt; + unsigned int dma_len; + int nents; + int dmas; + int ret; + int i; + + if (in_trans->addr + in_trans->size < in_trans->addr || + !in_trans->size) { + ret = -EINVAL; + goto out; + } + + xfer = kmalloc(sizeof(*xfer), GFP_KERNEL); + if (!xfer) { + ret = -ENOMEM; + goto out; + } + + nr_pages = PAGE_ALIGN(in_trans->size + offset_in_page(in_trans->addr)) + >> PAGE_SHIFT; + + page_list = kmalloc_array(nr_pages, sizeof(*page_list), GFP_KERNEL); + if (!page_list) { + ret = -ENOMEM; + goto free_resource; + } + + ret = get_user_pages_fast(in_trans->addr, nr_pages, 0, page_list); + if (ret < 0 || ret != nr_pages) { + ret = -EFAULT; + goto free_page_list; + } + + sgt = kmalloc(sizeof(*sgt), GFP_KERNEL); + if (!sgt) { + ret = -ENOMEM; + goto put_pages; + } + + ret = sg_alloc_table_from_pages(sgt, page_list, nr_pages, + offset_in_page(in_trans->addr), + in_trans->size, GFP_KERNEL); + if (ret) { + ret = -ENOMEM; + goto free_sgt; + } + + nents = dma_map_sg(&qdev->pdev->dev, sgt->sgl, sgt->nents, + DMA_TO_DEVICE); + if (!nents) { + ret = -EFAULT; + goto free_table; + } + + /* + * It turns out several of the iommu drivers don't combine adjacent + * regions, which is really what we expect based on the description of + * dma_map_sg(), so lets see if that can be done. It makes our message + * more efficent. + */ + dmas = 0; + last = sgt->sgl; + for_each_sg(sgt->sgl, sg, nents, i) { + if (sg_dma_address(last) + sg_dma_len(last) != + sg_dma_address(sg)) + dmas++; + last = sg; + } + + /* + * now that we finally know how many memory segments we will be encoding + * we can check to see if we have space in the message + */ + if (msg->hdr.len + sizeof(*out_trans) + dmas * sizeof(*out_trans->data) + > sizeof(*msg)) { + ret = -ENOSPC; + goto dma_unmap; + } + + msg->hdr.len += sizeof(*out_trans) + dmas * sizeof(*out_trans->data); + + out_trans->hdr.type = cpu_to_le32(TRANS_DMA_XFER_TO_DEV); + out_trans->hdr.len = cpu_to_le32(sizeof(*out_trans) + + dmas * sizeof(*out_trans->data)); + out_trans->tag = cpu_to_le32(in_trans->tag); + out_trans->count = cpu_to_le32(dmas); + + i = 0; + last = sgt->sgl; + dma_len = 0; + for_each_sg(sgt->sgl, sg, nents, dmas) { + /* hit a discontinuity, finalize segment and start new one */ + if (sg_dma_address(last) + sg_dma_len(last) != + sg_dma_address(sg)) { + out_trans->data[i].size = cpu_to_le64(dma_len); + if (dma_len) + i++; + dma_len = 0; + out_trans->data[i].addr = + cpu_to_le64(sg_dma_address(sg)); + } + dma_len += sg_dma_len(sg); + last = sg; + } + /* finalize the last segment */ + out_trans->data[i].size = cpu_to_le64(dma_len); + + *user_len += in_trans->hdr.len; + + xfer->sgt = sgt; + xfer->page_list = page_list; + xfer->nr_pages = nr_pages; + list_add(&xfer->list, &resources->dma_xfers); + return 0; + +dma_unmap: + dma_unmap_sg(&qdev->pdev->dev, sgt->sgl, sgt->nents, DMA_TO_DEVICE); +free_table: + sg_free_table(sgt); +free_sgt: + kfree(sgt); +put_pages: + for (i = 0; i < nr_pages; ++i) + put_page(page_list[i]); +free_page_list: + kfree(page_list); +free_resource: + kfree(xfer); +out: + return ret; +} + +static int encode_activate(struct qaic_device *qdev, void *trans, + struct _msg *msg, u32 *user_len, + struct ioctl_resources *resources) +{ + struct qaic_manage_trans_activate_to_dev *in_trans = trans; + struct _trans_activate_to_dev *out_trans = (void *)msg + msg->hdr.len; + dma_addr_t dma_addr; + void *buf; + u32 nelem; + u32 size; + + if (msg->hdr.len + sizeof(*out_trans) > sizeof(*msg)) + return -ENOSPC; + + if (!in_trans->queue_size) + return -EINVAL; + + nelem = in_trans->queue_size; + size = (get_dbc_req_elem_size() + get_dbc_rsp_elem_size()) * nelem; + if (size / nelem != get_dbc_req_elem_size() + get_dbc_rsp_elem_size()) + return -EINVAL; + + if (size + QAIC_DBC_Q_GAP + QAIC_DBC_Q_BUF_ALIGN < size) + return -EINVAL; + + size = ALIGN((size + QAIC_DBC_Q_GAP), QAIC_DBC_Q_BUF_ALIGN); + + buf = dma_alloc_coherent(&qdev->pdev->dev, size, &dma_addr, GFP_KERNEL); + if (!buf) + return -ENOMEM; + + out_trans->hdr.type = cpu_to_le32(TRANS_ACTIVATE_TO_DEV); + out_trans->hdr.len = cpu_to_le32(sizeof(*out_trans)); + out_trans->buf_len = cpu_to_le32(size); + out_trans->req_q_addr = cpu_to_le64(dma_addr); + out_trans->req_q_size = cpu_to_le32(nelem); + out_trans->rsp_q_addr = cpu_to_le64(dma_addr + size - nelem * + get_dbc_rsp_elem_size()); + out_trans->rsp_q_size = cpu_to_le32(nelem); + + *user_len += in_trans->hdr.len; + msg->hdr.len += sizeof(*out_trans); + + resources->buf = buf; + resources->dma_addr = dma_addr; + resources->total_size = size; + resources->nelem = nelem; + resources->rsp_q_base = buf + size - nelem * get_dbc_rsp_elem_size(); + return 0; +} + +static int encode_deactivate(struct qaic_device *qdev, void *trans, + u32 *user_len, struct qaic_user *usr) +{ + struct qaic_manage_trans_deactivate *in_trans = trans; + + if (in_trans->dbc_id >= QAIC_NUM_DBC || in_trans->resv) + return -EINVAL; + + *user_len += in_trans->hdr.len; + + return disable_dbc(qdev, in_trans->dbc_id, usr); +} + +static int encode_status(struct qaic_device *qdev, void *trans, + struct _msg *msg, u32 *user_len) +{ + struct qaic_manage_trans_status_to_dev *in_trans = trans; + struct _trans_status_to_dev *out_trans = (void *)msg + msg->hdr.len; + + if (msg->hdr.len + in_trans->hdr.len > sizeof(*msg)) + return -ENOSPC; + + out_trans->hdr.type = cpu_to_le32(TRANS_STATUS_TO_DEV); + out_trans->hdr.len = cpu_to_le32(in_trans->hdr.len); + msg->hdr.len += in_trans->hdr.len; + *user_len += in_trans->hdr.len; + + return 0; +} +static int encode_message(struct qaic_device *qdev, + struct qaic_manage_msg *user_msg, struct _msg *msg, + struct ioctl_resources *resources, + struct qaic_user *usr) +{ + struct qaic_manage_trans_hdr *trans_hdr; + u32 user_len = 0; + int ret; + int i; + + msg->hdr.len = sizeof(msg->hdr); + for (i = 0; i < user_msg->count; ++i) { + if (user_len >= user_msg->len) { + ret = -EINVAL; + break; + } + trans_hdr = (struct qaic_manage_trans_hdr *) + (user_msg->data + user_len); + if (user_len + trans_hdr->len > user_msg->len) { + ret = -EINVAL; + break; + } + + switch (trans_hdr->type) { + case TRANS_PASSTHROUGH_FROM_USR: + ret = encode_passthrough(qdev, trans_hdr, msg, + &user_len); + break; + case TRANS_DMA_XFER_FROM_USR: + ret = encode_dma(qdev, trans_hdr, msg, &user_len, + resources); + break; + case TRANS_ACTIVATE_FROM_USR: + ret = encode_activate(qdev, trans_hdr, msg, &user_len, + resources); + break; + case TRANS_DEACTIVATE_FROM_USR: + ret = encode_deactivate(qdev, trans_hdr, &user_len, + usr); + break; + case TRANS_STATUS_FROM_USR: + ret = encode_status(qdev, trans_hdr, msg, &user_len); + break; + default: + ret = -EINVAL; + break; + } + + if (ret) + break; + } + + if (user_len != user_msg->len) + ret = -EINVAL; + + if (ret) { + free_dma_xfers(qdev, resources); + free_dbc_buf(qdev, resources); + return ret; + } + + msg->hdr.count = user_msg->count; + return 0; +} + +static int decode_passthrough(struct qaic_device *qdev, void *trans, + struct qaic_manage_msg *user_msg, u32 *msg_len) +{ + struct _trans_passthrough *in_trans = trans; + struct qaic_manage_trans_passthrough *out_trans; + u32 len; + + out_trans = (void *)user_msg->data + user_msg->len; + + len = le32_to_cpu(in_trans->hdr.len); + if (user_msg->len + len > QAIC_MANAGE_MAX_MSG_LENGTH) + return -ENOSPC; + + memcpy(out_trans, in_trans, len); + user_msg->len += len; + *msg_len += len; + out_trans->hdr.type = le32_to_cpu(out_trans->hdr.type); + return 0; +} + +static int decode_activate(struct qaic_device *qdev, void *trans, + struct qaic_manage_msg *user_msg, u32 *msg_len, + struct ioctl_resources *resources, + struct qaic_user *usr) +{ + struct _trans_activate_from_dev *in_trans = trans; + struct qaic_manage_trans_activate_from_dev *out_trans; + u32 len; + + out_trans = (void *)user_msg->data + user_msg->len; + + len = le32_to_cpu(in_trans->hdr.len); + if (user_msg->len + len > QAIC_MANAGE_MAX_MSG_LENGTH) + return -ENOSPC; + + user_msg->len += len; + *msg_len += len; + out_trans->hdr.type = le32_to_cpu(in_trans->hdr.type); + out_trans->hdr.len = len; + out_trans->status = le32_to_cpu(in_trans->status); + out_trans->dbc_id = le32_to_cpu(in_trans->dbc_id); + + if (!resources->buf) + /* how did we get an activate response without a request? */ + return -EINVAL; + + if (out_trans->dbc_id >= QAIC_NUM_DBC) + /* + * The device assigned an invalid resource, which should never + * happen. Inject an error so the user can try to recover. + */ + out_trans->status = -ENODEV; + + resources->status = out_trans->status; + resources->dbc_id = out_trans->dbc_id; + if (!resources->status) + save_dbc_buf(qdev, resources, usr); + return 0; +} + +static int decode_deactivate(struct qaic_device *qdev, void *trans, + u32 *msg_len) +{ + struct _trans_deactivate_from_dev *in_trans = trans; + u32 dbc_id = le32_to_cpu(in_trans->dbc_id); + u32 status = le32_to_cpu(in_trans->status); + + if (dbc_id >= QAIC_NUM_DBC) + /* + * The device assigned an invalid resource, which should never + * happen. Inject an error so the user can try to recover. + */ + return -ENODEV; + + if (status) + /* + * Releasing resources failed on the device side, which puts + * us in a bind since they may still be in use, so be safe and + * do nothing. + */ + return -ENODEV; + + release_dbc(qdev, dbc_id); + *msg_len += sizeof(*in_trans); + return 0; +} + +static int decode_status(struct qaic_device *qdev, void *trans, + struct qaic_manage_msg *user_msg, u32 *user_len) +{ + struct _trans_status_from_dev *in_trans = trans; + struct qaic_manage_trans_status_from_dev *out_trans; + u32 len; + + out_trans = (void *)user_msg->data + user_msg->len; + + len = le32_to_cpu(in_trans->hdr.len); + if (user_msg->len + len > QAIC_MANAGE_MAX_MSG_LENGTH) + return -ENOSPC; + + out_trans->hdr.type = le32_to_cpu(TRANS_STATUS_FROM_DEV); + out_trans->hdr.len = len; + out_trans->major = le32_to_cpu(in_trans->major); + out_trans->minor = le32_to_cpu(in_trans->minor); + *user_len += len; + user_msg->len += len; + + return 0; +} + +static int decode_message(struct qaic_device *qdev, + struct qaic_manage_msg *user_msg, struct _msg *msg, + struct ioctl_resources *resources, + struct qaic_user *usr) +{ + struct _trans_hdr *trans_hdr; + u32 msg_len = 0; + int ret; + int i; + + if (msg->hdr.len > sizeof(*msg)) + return -EINVAL; + + user_msg->len = 0; + user_msg->count = le32_to_cpu(msg->hdr.count); + + for (i = 0; i < user_msg->count; ++i) { + trans_hdr = (struct _trans_hdr *)(msg->data + msg_len); + if (msg_len + trans_hdr->len > msg->hdr.len) + return -EINVAL; + + switch (trans_hdr->type) { + case TRANS_PASSTHROUGH_FROM_DEV: + ret = decode_passthrough(qdev, trans_hdr, user_msg, + &msg_len); + break; + case TRANS_ACTIVATE_FROM_DEV: + ret = decode_activate(qdev, trans_hdr, user_msg, + &msg_len, resources, usr); + break; + case TRANS_DEACTIVATE_FROM_DEV: + ret = decode_deactivate(qdev, trans_hdr, &msg_len); + break; + case TRANS_STATUS_FROM_DEV: + ret = decode_status(qdev, trans_hdr, user_msg, + &msg_len); + break; + default: + return -EINVAL; + } + + if (ret) + return ret; + } + + if (msg_len != (msg->hdr.len - sizeof(msg->hdr))) + return -EINVAL; + + return 0; +} + +static void *msg_xfer(struct qaic_device *qdev, struct wrapper_msg *wrapper, + u32 seq_num, bool ignore_signal) +{ + struct xfer_queue_elem elem; + struct _msg *out_buf; + size_t in_len; + long ret; + + if (qdev->in_reset) { + mutex_unlock(&qdev->cntl_mutex); + return ERR_PTR(-ENODEV); + } + + in_len = sizeof(wrapper->msg); + + elem.seq_num = seq_num; + elem.buf = NULL; + init_completion(&elem.xfer_done); + if (likely(!qdev->cntl_lost_buf)) { + out_buf = kmalloc(sizeof(*out_buf), GFP_KERNEL); + if (!out_buf) { + mutex_unlock(&qdev->cntl_mutex); + return ERR_PTR(-ENOMEM); + } + + ret = mhi_queue_buf(qdev->cntl_ch, DMA_FROM_DEVICE, + out_buf, sizeof(*out_buf), MHI_EOT); + if (ret) { + mutex_unlock(&qdev->cntl_mutex); + return ERR_PTR(ret); + } + } else { + /* + * we lost a buffer because we queued a recv buf, but then + * queuing the corresponding tx buf failed. To try to avoid + * a memory leak, lets reclaim it and use it for this + * transaction. + */ + qdev->cntl_lost_buf = false; + } + + kref_get(&wrapper->ref_count); + ret = mhi_queue_buf(qdev->cntl_ch, DMA_TO_DEVICE, &wrapper->msg, in_len, + MHI_EOT); + if (ret) { + qdev->cntl_lost_buf = true; + kref_put(&wrapper->ref_count, free_wrapper); + mutex_unlock(&qdev->cntl_mutex); + return ERR_PTR(ret); + } + + list_add_tail(&elem.list, &qdev->cntl_xfer_list); + mutex_unlock(&qdev->cntl_mutex); + + if (ignore_signal) + ret = wait_for_completion_timeout(&elem.xfer_done, + RESP_TIMEOUT); + else + ret = wait_for_completion_interruptible_timeout(&elem.xfer_done, + RESP_TIMEOUT); + /* + * not using _interruptable because we have to cleanup or we'll + * likely cause memory corruption + */ + mutex_lock(&qdev->cntl_mutex); + if (!list_empty(&elem.list)) + list_del(&elem.list); + if (!ret && !elem.buf) + ret = -ETIMEDOUT; + else if (ret > 0 && !elem.buf) + ret = -EIO; + mutex_unlock(&qdev->cntl_mutex); + + if (ret < 0) { + kfree(elem.buf); + return ERR_PTR(ret); + } + + return elem.buf; +} + +static int qaic_manage(struct qaic_device *qdev, struct qaic_user *usr, + struct qaic_manage_msg *user_msg) +{ + struct ioctl_resources resources; + struct wrapper_msg *wrapper; + struct _msg *msg; + struct _msg *rsp; + int ret; + + INIT_LIST_HEAD(&resources.dma_xfers); + resources.buf = NULL; + + if (user_msg->len > QAIC_MANAGE_MAX_MSG_LENGTH || + user_msg->count > + QAIC_MANAGE_MAX_MSG_LENGTH / sizeof(struct qaic_manage_trans_hdr)) { + ret = -EINVAL; + goto out; + } + + wrapper = kzalloc(sizeof(*wrapper), GFP_KERNEL); + if (!wrapper) { + ret = -ENOMEM; + goto out; + } + + kref_init(&wrapper->ref_count); + msg = &wrapper->msg; + + ret = encode_message(qdev, user_msg, msg, &resources, usr); + if (ret) + goto encode_failed; + + ret = mutex_lock_interruptible(&qdev->cntl_mutex); + if (ret) + goto lock_failed; + msg->hdr.magic_number = MANAGE_MAGIC_NUMBER; + msg->hdr.sequence_number = cpu_to_le32(qdev->next_seq_num++); + msg->hdr.len = cpu_to_le32(msg->hdr.len); + msg->hdr.count = cpu_to_le32(msg->hdr.count); + if (usr) + msg->hdr.handle = cpu_to_le32(usr->handle); + else + msg->hdr.handle = 0; + + /* msg_xfer releases the mutex */ + rsp = msg_xfer(qdev, wrapper, qdev->next_seq_num - 1, false); + if (IS_ERR(rsp)) { + ret = PTR_ERR(rsp); + goto lock_failed; + } + + ret = decode_message(qdev, user_msg, rsp, &resources, usr); + + kfree(rsp); +lock_failed: + free_dma_xfers(qdev, &resources); + free_dbc_buf(qdev, &resources); +encode_failed: + kref_put(&wrapper->ref_count, free_wrapper); +out: + return ret; +} + +int qaic_manage_ioctl(struct qaic_device *qdev, struct qaic_user *usr, + unsigned long arg) +{ + struct qaic_manage_msg *user_msg; + int ret; + + user_msg = kmalloc(sizeof(*user_msg), GFP_KERNEL); + if (!user_msg) { + ret = -ENOMEM; + goto out; + } + + if (copy_from_user(user_msg, (void __user *)arg, sizeof(*user_msg))) { + ret = -EFAULT; + goto copy_from_user_failed; + } + + ret = qaic_manage(qdev, usr, user_msg); + if (ret) + goto copy_from_user_failed; + + if (copy_to_user((void __user *)arg, user_msg, sizeof(*user_msg))) + ret = -EFAULT; + +copy_from_user_failed: + kfree(user_msg); +out: + return ret; +} + +int get_cntl_version(struct qaic_device *qdev, struct qaic_user *usr, + u16 *major, u16 *minor) +{ + int ret; + struct qaic_manage_msg *user_msg; + struct qaic_manage_trans_status_to_dev *status_query; + struct qaic_manage_trans_status_from_dev *status_result; + + user_msg = kmalloc(sizeof(*user_msg), GFP_KERNEL); + if (!user_msg) { + ret = -ENOMEM; + goto out; + } + user_msg->len = sizeof(*status_query); + user_msg->count = 1; + + status_query = (struct qaic_manage_trans_status_to_dev *)user_msg->data; + status_query->hdr.type = TRANS_STATUS_FROM_USR; + status_query->hdr.len = sizeof(status_query->hdr); + + ret = qaic_manage(qdev, usr, user_msg); + if (ret) + goto kfree_user_msg; + status_result = + (struct qaic_manage_trans_status_from_dev *)user_msg->data; + *major = status_result->major; + *minor = status_result->minor; + +kfree_user_msg: + kfree(user_msg); +out: + return ret; +} + +static void resp_worker(struct work_struct *work) +{ + struct resp_work *resp = container_of(work, struct resp_work, work); + struct qaic_device *qdev = resp->qdev; + struct _msg *msg = resp->buf; + struct xfer_queue_elem *elem; + struct xfer_queue_elem *i; + bool found = false; + + if (msg->hdr.magic_number != MANAGE_MAGIC_NUMBER) { + kfree(msg); + kfree(resp); + return; + } + + mutex_lock(&qdev->cntl_mutex); + list_for_each_entry_safe(elem, i, &qdev->cntl_xfer_list, list) { + if (elem->seq_num == le32_to_cpu(msg->hdr.sequence_number)) { + found = true; + list_del_init(&elem->list); + elem->buf = msg; + complete_all(&elem->xfer_done); + break; + } + } + mutex_unlock(&qdev->cntl_mutex); + + if (!found) + /* request must have timed out, drop packet */ + kfree(msg); + + kfree(resp); +} + +void qaic_mhi_ul_xfer_cb(struct mhi_device *mhi_dev, + struct mhi_result *mhi_result) +{ + struct _msg *msg = mhi_result->buf_addr; + struct wrapper_msg *wrapper = container_of(msg, struct wrapper_msg, + msg); + + kref_put(&wrapper->ref_count, free_wrapper); +} + +void qaic_mhi_dl_xfer_cb(struct mhi_device *mhi_dev, + struct mhi_result *mhi_result) +{ + struct qaic_device *qdev = dev_get_drvdata(&mhi_dev->dev); + struct _msg *msg = mhi_result->buf_addr; + struct resp_work *resp; + + if (mhi_result->transaction_status) { + kfree(msg); + return; + } + + resp = kmalloc(sizeof(*resp), GFP_ATOMIC); + if (!resp) { + pci_err(qdev->pdev, "dl_xfer_cb alloc fail, dropping message\n"); + kfree(msg); + return; + } + + INIT_WORK(&resp->work, resp_worker); + resp->qdev = qdev; + resp->buf = msg; + queue_work(qdev->cntl_wq, &resp->work); +} + +int qaic_control_open(struct qaic_device *qdev) +{ + if (!qdev->cntl_ch) + return -ENODEV; + + return mhi_prepare_for_transfer(qdev->cntl_ch); +} + +void qaic_control_close(struct qaic_device *qdev) +{ + mhi_unprepare_from_transfer(qdev->cntl_ch); +} + +void qaic_release_usr(struct qaic_device *qdev, struct qaic_user *usr) +{ + struct _trans_terminate_to_dev *trans; + struct wrapper_msg *wrapper; + struct _msg *msg; + struct _msg *rsp; + + wrapper = kzalloc(sizeof(*wrapper), GFP_KERNEL); + if (!wrapper) + return; + + kref_init(&wrapper->ref_count); + msg = &wrapper->msg; + + trans = (struct _trans_terminate_to_dev *)msg->data; + + trans->hdr.type = cpu_to_le32(TRANS_TERMINATE_TO_DEV); + trans->hdr.len = cpu_to_le32(sizeof(*trans)); + trans->handle = cpu_to_le32(usr->handle); + + mutex_lock(&qdev->cntl_mutex); + msg->hdr.magic_number = MANAGE_MAGIC_NUMBER; + msg->hdr.sequence_number = cpu_to_le32(qdev->next_seq_num++); + msg->hdr.len = cpu_to_le32(sizeof(msg->hdr) + sizeof(*trans)); + msg->hdr.count = cpu_to_le32(1); + msg->hdr.handle = cpu_to_le32(usr->handle); + + /* + * msg_xfer releases the mutex + * We don't care about the return of msg_xfer since we will not do + * anything different based on what happens. + * We ignore pending signals since one will be set if the user is + * killed, and we need give the device a chance to cleanup, otherwise + * DMA may still be in progress when we return. + */ + rsp = msg_xfer(qdev, wrapper, qdev->next_seq_num - 1, true); + if (!IS_ERR(rsp)) + kfree(rsp); + kref_put(&wrapper->ref_count, free_wrapper); +} + +void wake_all_cntl(struct qaic_device *qdev) +{ + struct xfer_queue_elem *elem; + struct xfer_queue_elem *i; + + mutex_lock(&qdev->cntl_mutex); + list_for_each_entry_safe(elem, i, &qdev->cntl_xfer_list, list) { + list_del_init(&elem->list); + complete_all(&elem->xfer_done); + } + mutex_unlock(&qdev->cntl_mutex); +} diff --git a/drivers/misc/qaic/qaic_drv.c b/drivers/misc/qaic/qaic_drv.c index 899b944..cc66975 100644 --- a/drivers/misc/qaic/qaic_drv.c +++ b/drivers/misc/qaic/qaic_drv.c @@ -12,21 +12,31 @@ #include #include #include +#include +#include +#include +#include +#include #include "mhi_controller.h" #include "qaic.h" #define PCI_DEV_AIC100 0xa100 +static u16 cntl_major; +static u16 cntl_minor = 3; static bool link_up; static int qaic_device_open(struct inode *inode, struct file *filp); static int qaic_device_release(struct inode *inode, struct file *filp); +static long qaic_ioctl(struct file *filp, unsigned int cmd, unsigned long arg); static const struct file_operations qaic_ops = { .owner = THIS_MODULE, .open = qaic_device_open, .release = qaic_device_release, + .unlocked_ioctl = qaic_ioctl, + .compat_ioctl = qaic_ioctl, }; static void free_usr(struct kref *kref) @@ -97,6 +107,7 @@ static int qaic_device_release(struct inode *inode, struct file *filp) if (!qdev->in_reset) { pci_dbg(qdev->pdev, "%s pid:%d\n", __func__, current->pid); + qaic_release_usr(qdev, usr); } srcu_read_unlock(&qdev->dev_lock, qdev_rcu_id); @@ -114,11 +125,46 @@ static int qaic_device_release(struct inode *inode, struct file *filp) return 0; } +static long qaic_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) +{ + struct qaic_user *usr = filp->private_data; + struct qaic_device *qdev = usr->qdev; + int qdev_rcu_id; + int usr_rcu_id; + int ret; + + usr_rcu_id = srcu_read_lock(&usr->qdev_lock); + if (!qdev) { + srcu_read_unlock(&usr->qdev_lock, usr_rcu_id); + return -ENODEV; + } + + qdev_rcu_id = srcu_read_lock(&qdev->dev_lock); + if (qdev->in_reset) { + srcu_read_unlock(&qdev->dev_lock, qdev_rcu_id); + srcu_read_unlock(&usr->qdev_lock, usr_rcu_id); + return -ENODEV; + } + + switch (cmd) { + case QAIC_IOCTL_MANAGE: + ret = qaic_manage_ioctl(qdev, usr, arg); + break; + default: + ret = -ENOTTY; + } + + srcu_read_unlock(&qdev->dev_lock, qdev_rcu_id); + srcu_read_unlock(&usr->qdev_lock, usr_rcu_id); + return ret; +} + static int qaic_mhi_probe(struct mhi_device *mhi_dev, const struct mhi_device_id *id) { struct qaic_device *qdev; int ret; + u16 major, minor; /* * Invoking this function indicates that the control channel to the @@ -140,14 +186,29 @@ static int qaic_mhi_probe(struct mhi_device *mhi_dev, dev_set_drvdata(&mhi_dev->dev, qdev); qdev->cntl_ch = mhi_dev; + ret = qaic_control_open(qdev); + if (ret) { + pci_dbg(qdev->pdev, "%s: control_open failed %d\n", __func__, ret); + goto err; + } + + ret = get_cntl_version(qdev, NULL, &major, &minor); + if (ret || major != cntl_major || minor > cntl_minor) { + pci_dbg(qdev->pdev, "%s: Control protocol version (%d.%d) not supported. Supported version is (%d.%d). Ret: %d\n", __func__, major, minor, cntl_major, cntl_minor, ret); + ret = -EINVAL; + goto close_control; + } + ret = misc_register(&qdev->mdev); if (ret) { pci_dbg(qdev->pdev, "%s: Misc device register failed Ret: %d\n", __func__, ret); - goto err; + goto close_control; } return 0; +close_control: + qaic_control_close(qdev); err: return ret; } @@ -156,22 +217,14 @@ static void qaic_mhi_remove(struct mhi_device *mhi_dev) { } -static void qaic_mhi_ul_xfer_cb(struct mhi_device *mhi_dev, - struct mhi_result *mhi_result) -{ -} - -static void qaic_mhi_dl_xfer_cb(struct mhi_device *mhi_dev, - struct mhi_result *mhi_result) -{ -} - void qaic_dev_reset_clean_local_state(struct qaic_device *qdev) { struct qaic_user *usr; struct qaic_user *u; qdev->in_reset = true; + /* wake up any waiters to avoid waiting for timeouts at sync */ + wake_all_cntl(qdev); synchronize_srcu(&qdev->dev_lock); /* @@ -199,10 +252,46 @@ void qaic_dev_reset_clean_local_state(struct qaic_device *qdev) } } +inline int get_dbc_req_elem_size(void) +{ + return 64; +} + +inline int get_dbc_rsp_elem_size(void) +{ + return 4; +} + +int disable_dbc(struct qaic_device *qdev, u32 dbc_id, struct qaic_user *usr) +{ + if (!qdev->dbc[dbc_id].usr || + qdev->dbc[dbc_id].usr->handle != usr->handle) + return -EPERM; + + qdev->dbc[dbc_id].usr = NULL; + synchronize_srcu(&qdev->dbc[dbc_id].ch_lock); + return 0; +} + +void release_dbc(struct qaic_device *qdev, u32 dbc_id) +{ + dma_free_coherent(&qdev->pdev->dev, qdev->dbc[dbc_id].total_size, + qdev->dbc[dbc_id].req_q_base, + qdev->dbc[dbc_id].dma_addr); + qdev->dbc[dbc_id].total_size = 0; + qdev->dbc[dbc_id].req_q_base = NULL; + qdev->dbc[dbc_id].dma_addr = 0; + qdev->dbc[dbc_id].nelem = 0; + qdev->dbc[dbc_id].usr = NULL; + qdev->dbc[dbc_id].in_use = false; + wake_up(&qdev->dbc[dbc_id].dbc_release); +} + static int qaic_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id) { int ret; + int i; int mhi_irq; struct qaic_device *qdev; @@ -214,8 +303,15 @@ static int qaic_pci_probe(struct pci_dev *pdev, goto qdev_fail; } + qdev->cntl_wq = alloc_workqueue("qaic_cntl", WQ_UNBOUND, 0); + if (!qdev->cntl_wq) { + ret = -ENOMEM; + goto wq_fail; + } pci_set_drvdata(pdev, qdev); qdev->pdev = pdev; + mutex_init(&qdev->cntl_mutex); + INIT_LIST_HEAD(&qdev->cntl_xfer_list); init_srcu_struct(&qdev->dev_lock); INIT_LIST_HEAD(&qdev->users); mutex_init(&qdev->users_mutex); @@ -228,6 +324,16 @@ static int qaic_pci_probe(struct pci_dev *pdev, qdev->mdev.minor = MISC_DYNAMIC_MINOR; qdev->mdev.name = &qdev->mdev_name[0]; qdev->mdev.fops = &qaic_ops; + for (i = 0; i < QAIC_NUM_DBC; ++i) { + mutex_init(&qdev->dbc[i].mem_lock); + spin_lock_init(&qdev->dbc[i].xfer_lock); + idr_init(&qdev->dbc[i].mem_handles); + qdev->dbc[i].qdev = qdev; + qdev->dbc[i].id = i; + INIT_LIST_HEAD(&qdev->dbc[i].xfer_list); + init_srcu_struct(&qdev->dbc[i].ch_lock); + init_waitqueue_head(&qdev->dbc[i].dbc_release); + } qdev->bars = pci_select_bars(pdev, IORESOURCE_MEM); @@ -261,6 +367,15 @@ static int qaic_pci_probe(struct pci_dev *pdev, goto ioremap_0_fail; } + qdev->bar_2 = pci_ioremap_bar(pdev, 2); + if (!qdev->bar_2) { + ret = -ENOMEM; + goto ioremap_2_fail; + } + + for (i = 0; i < QAIC_NUM_DBC; ++i) + qdev->dbc[i].dbc_base = qdev->bar_2 + QAIC_DBC_OFF(i); + ret = pci_alloc_irq_vectors(pdev, 1, 32, PCI_IRQ_MSI); if (ret < 0) goto alloc_irq_fail; @@ -292,6 +407,8 @@ static int qaic_pci_probe(struct pci_dev *pdev, invalid_msi_config: pci_free_irq_vectors(pdev); alloc_irq_fail: + iounmap(qdev->bar_2); +ioremap_2_fail: iounmap(qdev->bar_0); ioremap_0_fail: dma_mask_fail: @@ -302,7 +419,11 @@ static int qaic_pci_probe(struct pci_dev *pdev, enable_fail: pci_set_drvdata(pdev, NULL); bar_fail: + for (i = 0; i < QAIC_NUM_DBC; ++i) + cleanup_srcu_struct(&qdev->dbc[i].ch_lock); cleanup_srcu_struct(&qdev->dev_lock); + destroy_workqueue(qdev->cntl_wq); +wq_fail: kfree(qdev); qdev_fail: return ret; @@ -311,6 +432,7 @@ static int qaic_pci_probe(struct pci_dev *pdev, static void qaic_pci_remove(struct pci_dev *pdev) { struct qaic_device *qdev = pci_get_drvdata(pdev); + int i; pci_dbg(pdev, "%s\n", __func__); if (!qdev) @@ -318,6 +440,9 @@ static void qaic_pci_remove(struct pci_dev *pdev) qaic_dev_reset_clean_local_state(qdev); qaic_mhi_free_controller(qdev->mhi_cntl, link_up); + for (i = 0; i < QAIC_NUM_DBC; ++i) + cleanup_srcu_struct(&qdev->dbc[i].ch_lock); + destroy_workqueue(qdev->cntl_wq); pci_free_irq_vectors(pdev); iounmap(qdev->bar_0); pci_clear_master(pdev); diff --git a/include/uapi/misc/qaic.h b/include/uapi/misc/qaic.h new file mode 100644 index 0000000..e95ef99 --- /dev/null +++ b/include/uapi/misc/qaic.h @@ -0,0 +1,117 @@ +/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note + * + * Copyright (c) 2019-2020, The Linux Foundation. All rights reserved. + */ + +#ifndef QAIC_H_ +#define QAIC_H_ + +#include +#include + +#define QAIC_MANAGE_MAX_MSG_LENGTH 16364 + +enum qaic_manage_transaction_type { + TRANS_UNDEFINED = 0, + TRANS_PASSTHROUGH_FROM_USR = 1, + TRANS_PASSTHROUGH_TO_USR = 2, + TRANS_PASSTHROUGH_FROM_DEV = 3, + TRANS_PASSTHROUGH_TO_DEV = 4, + TRANS_DMA_XFER_FROM_USR = 5, + TRANS_DMA_XFER_TO_DEV = 6, + TRANS_ACTIVATE_FROM_USR = 7, + TRANS_ACTIVATE_FROM_DEV = 8, + TRANS_ACTIVATE_TO_DEV = 9, + TRANS_DEACTIVATE_FROM_USR = 10, + TRANS_DEACTIVATE_FROM_DEV = 11, + TRANS_STATUS_FROM_USR = 12, + TRANS_STATUS_TO_USR = 13, + TRANS_STATUS_FROM_DEV = 14, + TRANS_STATUS_TO_DEV = 15, + TRANS_TERMINATE_FROM_DEV = 16, + TRANS_TERMINATE_TO_DEV = 17, + TRANS_MAX = 18 +}; + +struct qaic_manage_trans_hdr { + __u32 type; /* value from enum manage_transaction_type */ + __u32 len; /* length of this transaction, including the header */ +}; + +struct qaic_manage_trans_passthrough { + struct qaic_manage_trans_hdr hdr; + u8 data[0]; /* userspace must encode in little endian */ +}; + +struct qaic_manage_trans_dma_xfer { + struct qaic_manage_trans_hdr hdr; + __u32 tag; + __u32 count; + __u64 addr; + __u64 size; +}; + +struct qaic_manage_trans_activate_to_dev { + struct qaic_manage_trans_hdr hdr; + __u32 queue_size; /* in number of elements */ + __u32 eventfd; +}; + +struct qaic_manage_trans_activate_from_dev { + struct qaic_manage_trans_hdr hdr; + __u32 status; + __u32 dbc_id; /* Identifier of assigned DMA Bridge channel */ +}; + +struct qaic_manage_trans_deactivate { + struct qaic_manage_trans_hdr hdr; + __u32 dbc_id; /* Identifier of assigned DMA Bridge channel */ + __u32 resv; /* Padding, must be 0 */ +}; + +struct qaic_manage_trans_status_to_dev { + struct qaic_manage_trans_hdr hdr; +}; + +struct qaic_manage_trans_status_from_dev { + struct qaic_manage_trans_hdr hdr; + __u16 major; + __u16 minor; + __u32 status; +}; + +struct qaic_manage_msg { + __u32 len; /* Length of valid data - ie sum of all transactions */ + __u32 count; /* Number of transactions in message */ + __u8 data[QAIC_MANAGE_MAX_MSG_LENGTH]; +}; + +#define QAIC_IOCTL_MANAGE_NR 0x01 + +/* + * Send Manage command to the device + * + * A manage command is a message that consists of N transactions. The set + * of transactions consititues a single operation. In most cases, a manage + * command is a request for the device to do something. The entire command + * must be encoded into a single message. + * + * The command will be encoded into the wire format, and sent to the device. + * the process will then be blocked until the device responds to the message + * or a timeout is reached. If a response is successfully received, it will + * be encoded into the provided message structure. + * + * The return value is 0 for success, or a standard error code. Some of the + * possible errors: + * + * EINTR - Kernel waiting was interrupted (IE received a signal for user) + * ETIMEDOUT - Timeout for response from device expired + * EINVAL - Invalid message + * ENOSPC - Ran out of space to encode the message into the wire protocol + * ENOMEM - Unable to obtain memory while processing message + * EFAULT - Error in accessing memory from user + */ +#define QAIC_IOCTL_MANAGE _IOWR('Q', QAIC_IOCTL_MANAGE_NR, \ + struct qaic_manage_msg) + +#endif /* QAIC_H_ */