diff options
Diffstat (limited to 'drivers/accel')
| -rw-r--r-- | drivers/accel/qaic/Makefile | 2 | ||||
| -rw-r--r-- | drivers/accel/qaic/qaic.h | 8 | ||||
| -rw-r--r-- | drivers/accel/qaic/qaic_debugfs.c | 272 | ||||
| -rw-r--r-- | drivers/accel/qaic/qaic_debugfs.h | 20 | ||||
| -rw-r--r-- | drivers/accel/qaic/qaic_drv.c | 16 |
5 files changed, 317 insertions, 1 deletions
diff --git a/drivers/accel/qaic/Makefile b/drivers/accel/qaic/Makefile index 3f7f6dfde7f2..2cadcc1baa0e 100644 --- a/drivers/accel/qaic/Makefile +++ b/drivers/accel/qaic/Makefile @@ -11,3 +11,5 @@ qaic-y := \ qaic_data.o \ qaic_drv.o \ qaic_timesync.o + +qaic-$(CONFIG_DEBUG_FS) += qaic_debugfs.o diff --git a/drivers/accel/qaic/qaic.h b/drivers/accel/qaic/qaic.h index 9256653b3036..03d9c9fbffb3 100644 --- a/drivers/accel/qaic/qaic.h +++ b/drivers/accel/qaic/qaic.h @@ -153,6 +153,14 @@ struct qaic_device { struct mhi_device *qts_ch; /* Work queue for tasks related to MHI "QAIC_TIMESYNC" channel */ struct workqueue_struct *qts_wq; + /* Head of list of page allocated by MHI bootlog device */ + struct list_head bootlog; + /* MHI bootlog channel device */ + struct mhi_device *bootlog_ch; + /* Work queue for tasks related to MHI bootlog device */ + struct workqueue_struct *bootlog_wq; + /* Synchronizes access of pages in MHI bootlog device */ + struct mutex bootlog_mutex; }; struct qaic_drm_device { diff --git a/drivers/accel/qaic/qaic_debugfs.c b/drivers/accel/qaic/qaic_debugfs.c new file mode 100644 index 000000000000..9d0d43fb5b8f --- /dev/null +++ b/drivers/accel/qaic/qaic_debugfs.c @@ -0,0 +1,272 @@ +// SPDX-License-Identifier: GPL-2.0-only + +/* Copyright (c) 2020, The Linux Foundation. All rights reserved. */ +/* Copyright (c) 2021-2024 Qualcomm Innovation Center, Inc. All rights reserved. */ + +#include <linux/debugfs.h> +#include <linux/device.h> +#include <linux/fs.h> +#include <linux/list.h> +#include <linux/mhi.h> +#include <linux/mutex.h> +#include <linux/overflow.h> +#include <linux/pci.h> +#include <linux/seq_file.h> +#include <linux/string.h> +#include <linux/types.h> +#include <linux/workqueue.h> + +#include "qaic.h" +#include "qaic_debugfs.h" + +#define BOOTLOG_POOL_SIZE 16 +#define BOOTLOG_MSG_SIZE 512 + +struct bootlog_msg { + /* Buffer for bootlog messages */ + char str[BOOTLOG_MSG_SIZE]; + /* Root struct of device, used to access device resources */ + struct qaic_device *qdev; + /* Work struct to schedule work coming on QAIC_LOGGING channel */ + struct work_struct work; +}; + +struct bootlog_page { + /* Node in list of bootlog pages maintained by root device struct */ + struct list_head node; + /* Total size of the buffer that holds the bootlogs. It is PAGE_SIZE */ + unsigned int size; + /* Offset for the next bootlog */ + unsigned int offset; +}; + +static int bootlog_show(struct seq_file *s, void *unused) +{ + struct bootlog_page *page; + struct qaic_device *qdev; + void *page_end; + void *log; + + qdev = s->private; + mutex_lock(&qdev->bootlog_mutex); + list_for_each_entry(page, &qdev->bootlog, node) { + log = page + 1; + page_end = (void *)page + page->offset; + while (log < page_end) { + seq_printf(s, "%s", (char *)log); + log += strlen(log) + 1; + } + } + mutex_unlock(&qdev->bootlog_mutex); + + return 0; +} + +static int bootlog_fops_open(struct inode *inode, struct file *file) +{ + return single_open(file, bootlog_show, inode->i_private); +} + +static const struct file_operations bootlog_fops = { + .owner = THIS_MODULE, + .open = bootlog_fops_open, + .read = seq_read, + .llseek = seq_lseek, + .release = single_release, +}; + +void qaic_debugfs_init(struct qaic_drm_device *qddev) +{ + struct qaic_device *qdev = qddev->qdev; + struct dentry *debugfs_root; + + debugfs_root = to_drm(qddev)->debugfs_root; + + debugfs_create_file("bootlog", 0400, debugfs_root, qdev, &bootlog_fops); +} + +static struct bootlog_page *alloc_bootlog_page(struct qaic_device *qdev) +{ + struct bootlog_page *page; + + page = (struct bootlog_page *)devm_get_free_pages(&qdev->pdev->dev, GFP_KERNEL, 0); + if (!page) + return page; + + page->size = PAGE_SIZE; + page->offset = sizeof(*page); + list_add_tail(&page->node, &qdev->bootlog); + + return page; +} + +static int reset_bootlog(struct qaic_device *qdev) +{ + struct bootlog_page *page; + struct bootlog_page *i; + + mutex_lock(&qdev->bootlog_mutex); + list_for_each_entry_safe(page, i, &qdev->bootlog, node) { + list_del(&page->node); + devm_free_pages(&qdev->pdev->dev, (unsigned long)page); + } + + page = alloc_bootlog_page(qdev); + mutex_unlock(&qdev->bootlog_mutex); + if (!page) + return -ENOMEM; + + return 0; +} + +static void *bootlog_get_space(struct qaic_device *qdev, unsigned int size) +{ + struct bootlog_page *page; + + page = list_last_entry(&qdev->bootlog, struct bootlog_page, node); + + if (size_add(size, sizeof(*page)) > page->size) + return NULL; + + if (page->offset + size > page->size) { + page = alloc_bootlog_page(qdev); + if (!page) + return NULL; + } + + return (void *)page + page->offset; +} + +static void bootlog_commit(struct qaic_device *qdev, unsigned int size) +{ + struct bootlog_page *page; + + page = list_last_entry(&qdev->bootlog, struct bootlog_page, node); + + page->offset += size; +} + +static void bootlog_log(struct work_struct *work) +{ + struct bootlog_msg *msg = container_of(work, struct bootlog_msg, work); + unsigned int len = strlen(msg->str) + 1; + struct qaic_device *qdev = msg->qdev; + void *log; + + mutex_lock(&qdev->bootlog_mutex); + log = bootlog_get_space(qdev, len); + if (log) { + memcpy(log, msg, len); + bootlog_commit(qdev, len); + } + mutex_unlock(&qdev->bootlog_mutex); + + if (mhi_queue_buf(qdev->bootlog_ch, DMA_FROM_DEVICE, msg, BOOTLOG_MSG_SIZE, MHI_EOT)) + devm_kfree(&qdev->pdev->dev, msg); +} + +static int qaic_bootlog_mhi_probe(struct mhi_device *mhi_dev, const struct mhi_device_id *id) +{ + struct qaic_device *qdev = pci_get_drvdata(to_pci_dev(mhi_dev->mhi_cntrl->cntrl_dev)); + struct bootlog_msg *msg; + int i, ret; + + qdev->bootlog_wq = alloc_ordered_workqueue("qaic_bootlog", 0); + if (!qdev->bootlog_wq) { + ret = -ENOMEM; + goto out; + } + + ret = reset_bootlog(qdev); + if (ret) + goto destroy_workqueue; + + ret = mhi_prepare_for_transfer(mhi_dev); + if (ret) + goto destroy_workqueue; + + for (i = 0; i < BOOTLOG_POOL_SIZE; i++) { + msg = devm_kzalloc(&qdev->pdev->dev, sizeof(*msg), GFP_KERNEL); + if (!msg) { + ret = -ENOMEM; + goto mhi_unprepare; + } + + msg->qdev = qdev; + INIT_WORK(&msg->work, bootlog_log); + + ret = mhi_queue_buf(mhi_dev, DMA_FROM_DEVICE, msg, BOOTLOG_MSG_SIZE, MHI_EOT); + if (ret) + goto mhi_unprepare; + } + + dev_set_drvdata(&mhi_dev->dev, qdev); + qdev->bootlog_ch = mhi_dev; + return 0; + +mhi_unprepare: + mhi_unprepare_from_transfer(mhi_dev); +destroy_workqueue: + flush_workqueue(qdev->bootlog_wq); + destroy_workqueue(qdev->bootlog_wq); +out: + return ret; +} + +static void qaic_bootlog_mhi_remove(struct mhi_device *mhi_dev) +{ + struct qaic_device *qdev; + + qdev = dev_get_drvdata(&mhi_dev->dev); + + mhi_unprepare_from_transfer(qdev->bootlog_ch); + flush_workqueue(qdev->bootlog_wq); + destroy_workqueue(qdev->bootlog_wq); + qdev->bootlog_ch = NULL; +} + +static void qaic_bootlog_mhi_ul_xfer_cb(struct mhi_device *mhi_dev, struct mhi_result *mhi_result) +{ +} + +static void qaic_bootlog_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 bootlog_msg *msg = mhi_result->buf_addr; + + if (mhi_result->transaction_status) { + devm_kfree(&qdev->pdev->dev, msg); + return; + } + + /* Force a null at the end of the transferred string */ + msg->str[mhi_result->bytes_xferd - 1] = 0; + + queue_work(qdev->bootlog_wq, &msg->work); +} + +static const struct mhi_device_id qaic_bootlog_mhi_match_table[] = { + { .chan = "QAIC_LOGGING", }, + {}, +}; + +static struct mhi_driver qaic_bootlog_mhi_driver = { + .id_table = qaic_bootlog_mhi_match_table, + .remove = qaic_bootlog_mhi_remove, + .probe = qaic_bootlog_mhi_probe, + .ul_xfer_cb = qaic_bootlog_mhi_ul_xfer_cb, + .dl_xfer_cb = qaic_bootlog_mhi_dl_xfer_cb, + .driver = { + .name = "qaic_bootlog", + }, +}; + +int qaic_bootlog_register(void) +{ + return mhi_driver_register(&qaic_bootlog_mhi_driver); +} + +void qaic_bootlog_unregister(void) +{ + mhi_driver_unregister(&qaic_bootlog_mhi_driver); +} diff --git a/drivers/accel/qaic/qaic_debugfs.h b/drivers/accel/qaic/qaic_debugfs.h new file mode 100644 index 000000000000..ea3fd1a88405 --- /dev/null +++ b/drivers/accel/qaic/qaic_debugfs.h @@ -0,0 +1,20 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ + +/* Copyright (c) 2020, The Linux Foundation. All rights reserved. */ +/* Copyright (c) 2024 Qualcomm Innovation Center, Inc. All rights reserved. */ + +#ifndef __QAIC_DEBUGFS_H__ +#define __QAIC_DEBUGFS_H__ + +#include <drm/drm_file.h> + +#ifdef CONFIG_DEBUG_FS +int qaic_bootlog_register(void); +void qaic_bootlog_unregister(void); +void qaic_debugfs_init(struct qaic_drm_device *qddev); +#else +int qaic_bootlog_register(void) { return 0; } +void qaic_bootlog_unregister(void) {} +void qaic_debugfs_init(struct qaic_drm_device *qddev) {} +#endif /* CONFIG_DEBUG_FS */ +#endif /* __QAIC_DEBUGFS_H__ */ diff --git a/drivers/accel/qaic/qaic_drv.c b/drivers/accel/qaic/qaic_drv.c index d1a632dbaec6..f072edb74f22 100644 --- a/drivers/accel/qaic/qaic_drv.c +++ b/drivers/accel/qaic/qaic_drv.c @@ -28,6 +28,7 @@ #include "mhi_controller.h" #include "qaic.h" +#include "qaic_debugfs.h" #include "qaic_timesync.h" MODULE_IMPORT_NS(DMA_BUF); @@ -229,8 +230,12 @@ static int qaic_create_drm_device(struct qaic_device *qdev, s32 partition_id) qddev->partition_id = partition_id; ret = drm_dev_register(drm, 0); - if (ret) + if (ret) { pci_dbg(qdev->pdev, "drm_dev_register failed %d\n", ret); + return ret; + } + + qaic_debugfs_init(qddev); return ret; } @@ -382,6 +387,9 @@ static struct qaic_device *create_qdev(struct pci_dev *pdev, const struct pci_de ret = drmm_mutex_init(drm, &qdev->cntl_mutex); if (ret) return NULL; + ret = drmm_mutex_init(drm, &qdev->bootlog_mutex); + if (ret) + return NULL; qdev->cntl_wq = qaicm_wq_init(drm, "qaic_cntl"); if (IS_ERR(qdev->cntl_wq)) @@ -399,6 +407,7 @@ static struct qaic_device *create_qdev(struct pci_dev *pdev, const struct pci_de qddev->qdev = qdev; INIT_LIST_HEAD(&qdev->cntl_xfer_list); + INIT_LIST_HEAD(&qdev->bootlog); INIT_LIST_HEAD(&qddev->users); for (i = 0; i < qdev->num_dbc; ++i) { @@ -639,6 +648,10 @@ static int __init qaic_init(void) if (ret) pr_debug("qaic: qaic_timesync_init failed %d\n", ret); + ret = qaic_bootlog_register(); + if (ret) + pr_debug("qaic: qaic_bootlog_register failed %d\n", ret); + return 0; free_pci: @@ -664,6 +677,7 @@ static void __exit qaic_exit(void) * reinitializing the link_up state after the cleanup is done. */ link_up = true; + qaic_bootlog_unregister(); qaic_timesync_deinit(); mhi_driver_unregister(&qaic_mhi_driver); pci_unregister_driver(&qaic_pci_driver); |