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[93.173.65.134]) by smtp.gmail.com with ESMTPSA id h22sm3270337wmb.36.2021.03.11.01.50.57 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 11 Mar 2021 01:50:58 -0800 (PST) From: eli.billauer@gmail.com To: gregkh@linuxfoundation.org, arnd@arndb.de Cc: linux-kernel@vger.kernel.org, devel@driverdev.osuosl.org, linux-usb@vger.kernel.org, dan.carpenter@oracle.com, Eli Billauer Subject: [PATCH v4 1/2] char: xillybus: Move class-related functions to new xillybus_class.c Date: Thu, 11 Mar 2021 11:50:32 +0200 Message-Id: <20210311095033.20956-2-eli.billauer@gmail.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20210311095033.20956-1-eli.billauer@gmail.com> References: <20210311095033.20956-1-eli.billauer@gmail.com> Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org From: Eli Billauer This patch is a preparation for adding another related driver, XillyUSB. In order to share some code between the existing Xillybus driver and the one to be added, some functions are moved to xillybus_class.c The header file, xillybus_class.h, is temporarily placed in include/linux/, because the new XillyUSB driver is intended as a staging driver for the time being. Signed-off-by: Eli Billauer --- Notes: Changelog: v4: - Fix error code return value bugs in xillybus_init_chrdev() as detected by Smatch test robot, and reported by Dan Carpenter. This patch did not exist prior to v3. drivers/char/xillybus/Kconfig | 4 + drivers/char/xillybus/Makefile | 1 + drivers/char/xillybus/xillybus.h | 10 +- drivers/char/xillybus/xillybus_class.c | 263 +++++++++++++++++++++++++ drivers/char/xillybus/xillybus_core.c | 181 +++-------------- include/linux/xillybus_class.h | 30 +++ 6 files changed, 322 insertions(+), 167 deletions(-) create mode 100644 drivers/char/xillybus/xillybus_class.c create mode 100644 include/linux/xillybus_class.h diff --git a/drivers/char/xillybus/Kconfig b/drivers/char/xillybus/Kconfig index 130dbdce858f..e7800f025249 100644 --- a/drivers/char/xillybus/Kconfig +++ b/drivers/char/xillybus/Kconfig @@ -3,10 +3,14 @@ # Xillybus devices # +config XILLYBUS_CLASS + tristate + config XILLYBUS tristate "Xillybus generic FPGA interface" depends on PCI || OF select CRC32 + select XILLYBUS_CLASS help Xillybus is a generic interface for peripherals designed on programmable logic (FPGA). The driver probes the hardware for diff --git a/drivers/char/xillybus/Makefile b/drivers/char/xillybus/Makefile index 099e9a3585fc..591615264591 100644 --- a/drivers/char/xillybus/Makefile +++ b/drivers/char/xillybus/Makefile @@ -3,6 +3,7 @@ # Makefile for Xillybus driver # +obj-$(CONFIG_XILLYBUS_CLASS) += xillybus_class.o obj-$(CONFIG_XILLYBUS) += xillybus_core.o obj-$(CONFIG_XILLYBUS_PCIE) += xillybus_pcie.o obj-$(CONFIG_XILLYBUS_OF) += xillybus_of.o diff --git a/drivers/char/xillybus/xillybus.h b/drivers/char/xillybus/xillybus.h index 8e3ed4d1bb7f..c63ffc56637c 100644 --- a/drivers/char/xillybus/xillybus.h +++ b/drivers/char/xillybus/xillybus.h @@ -30,7 +30,8 @@ struct xilly_buffer { struct xilly_idt_handle { unsigned char *chandesc; - unsigned char *idt; + unsigned char *names; + int names_len; int entries; }; @@ -94,7 +95,6 @@ struct xilly_endpoint { struct device *dev; struct xilly_endpoint_hardware *ephw; - struct list_head ep_list; int dma_using_dac; /* =1 if 64-bit DMA is used, =0 otherwise. */ __iomem void *registers; int fatal_error; @@ -102,12 +102,6 @@ struct xilly_endpoint { struct mutex register_mutex; wait_queue_head_t ep_wait; - /* Channels and message handling */ - struct cdev cdev; - - int major; - int lowest_minor; /* Highest minor = lowest_minor + num_channels - 1 */ - int num_channels; /* EXCLUDING message buffer */ struct xilly_channel **channels; int msg_counter; diff --git a/drivers/char/xillybus/xillybus_class.c b/drivers/char/xillybus/xillybus_class.c new file mode 100644 index 000000000000..f97edb719df1 --- /dev/null +++ b/drivers/char/xillybus/xillybus_class.c @@ -0,0 +1,263 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright 2021 Xillybus Ltd, http://xillybus.com + * + * Driver for the Xillybus class + */ + +#include +#include +#include +#include +#include +#include +#include +#include + +#include + +MODULE_DESCRIPTION("Driver for Xillybus class"); +MODULE_AUTHOR("Eli Billauer, Xillybus Ltd."); +MODULE_VERSION("1.0"); +MODULE_ALIAS("xillybus_class"); +MODULE_LICENSE("GPL v2"); + +static DEFINE_MUTEX(unit_mutex); +static LIST_HEAD(unit_list); +static struct class *xillybus_class; + +#define UNITNAMELEN 16 + +struct xilly_unit { + struct list_head list_entry; + void *private_data; + + struct cdev *cdev; + char name[UNITNAMELEN]; + int major; + int lowest_minor; + int num_nodes; +}; + +int xillybus_init_chrdev(struct device *dev, + const struct file_operations *fops, + struct module *owner, + void *private_data, + unsigned char *idt, unsigned int len, + int num_nodes, + const char *prefix, bool enumerate) +{ + int rc; + dev_t mdev; + int i; + char devname[48]; + + struct device *device; + size_t namelen; + struct xilly_unit *unit, *u; + + unit = kzalloc(sizeof(*unit), GFP_KERNEL); + + if (!unit) + return -ENOMEM; + + mutex_lock(&unit_mutex); + + if (!enumerate) + snprintf(unit->name, UNITNAMELEN, "%s", prefix); + + for (i = 0; enumerate; i++) { + snprintf(unit->name, UNITNAMELEN, "%s_%02d", + prefix, i); + + enumerate = false; + list_for_each_entry(u, &unit_list, list_entry) + if (!strcmp(unit->name, u->name)) { + enumerate = true; + break; + } + } + + rc = alloc_chrdev_region(&mdev, 0, num_nodes, unit->name); + + if (rc) { + dev_warn(dev, "Failed to obtain major/minors"); + goto fail_obtain; + } + + unit->major = MAJOR(mdev); + unit->lowest_minor = MINOR(mdev); + unit->num_nodes = num_nodes; + unit->private_data = private_data; + + unit->cdev = cdev_alloc(); + if (!unit->cdev) { + rc = -ENOMEM; + goto unregister_chrdev; + } + unit->cdev->ops = fops; + unit->cdev->owner = owner; + + rc = cdev_add(unit->cdev, MKDEV(unit->major, unit->lowest_minor), + unit->num_nodes); + if (rc) { + dev_err(dev, "Failed to add cdev.\n"); + /* kobject_put() is normally done by cdev_del() */ + kobject_put(&unit->cdev->kobj); + goto unregister_chrdev; + } + + for (i = 0; i < num_nodes; i++) { + namelen = strnlen(idt, len); + + if (namelen == len) { + dev_err(dev, "IDT's list of names is too short. This is exceptionally weird, because its CRC is OK\n"); + rc = -ENODEV; + goto unroll_device_create; + } + + snprintf(devname, sizeof(devname), "%s_%s", + unit->name, idt); + + len -= namelen + 1; + idt += namelen + 1; + + device = device_create(xillybus_class, + NULL, + MKDEV(unit->major, + i + unit->lowest_minor), + NULL, + "%s", devname); + + if (IS_ERR(device)) { + dev_err(dev, "Failed to create %s device. Aborting.\n", + devname); + rc = -ENODEV; + goto unroll_device_create; + } + } + + if (len) { + dev_err(dev, "IDT's list of names is too long. This is exceptionally weird, because its CRC is OK\n"); + rc = -ENODEV; + goto unroll_device_create; + } + + list_add_tail(&unit->list_entry, &unit_list); + + dev_info(dev, "Created %d device files.\n", num_nodes); + + mutex_unlock(&unit_mutex); + + return 0; + +unroll_device_create: + for (i--; i >= 0; i--) + device_destroy(xillybus_class, MKDEV(unit->major, + i + unit->lowest_minor)); + + cdev_del(unit->cdev); + +unregister_chrdev: + unregister_chrdev_region(MKDEV(unit->major, unit->lowest_minor), + unit->num_nodes); + +fail_obtain: + mutex_unlock(&unit_mutex); + + kfree(unit); + + return rc; +} +EXPORT_SYMBOL(xillybus_init_chrdev); + +void xillybus_cleanup_chrdev(void *private_data, + struct device *dev) +{ + int minor; + struct xilly_unit *unit; + bool found = false; + + mutex_lock(&unit_mutex); + + list_for_each_entry(unit, &unit_list, list_entry) + if (unit->private_data == private_data) { + found = true; + break; + } + + if (!found) { + dev_err(dev, "Weird bug: Failed to find unit\n"); + mutex_unlock(&unit_mutex); + return; + } + + for (minor = unit->lowest_minor; + minor < (unit->lowest_minor + unit->num_nodes); + minor++) + device_destroy(xillybus_class, MKDEV(unit->major, minor)); + + cdev_del(unit->cdev); + + unregister_chrdev_region(MKDEV(unit->major, unit->lowest_minor), + unit->num_nodes); + + dev_info(dev, "Removed %d device files.\n", + unit->num_nodes); + + list_del(&unit->list_entry); + kfree(unit); + + mutex_unlock(&unit_mutex); +} +EXPORT_SYMBOL(xillybus_cleanup_chrdev); + +int xillybus_find_inode(struct inode *inode, + void **private_data, int *index) +{ + int minor = iminor(inode); + int major = imajor(inode); + struct xilly_unit *unit; + bool found = false; + + mutex_lock(&unit_mutex); + + list_for_each_entry(unit, &unit_list, list_entry) + if (unit->major == major && + minor >= unit->lowest_minor && + minor < (unit->lowest_minor + unit->num_nodes)) { + found = true; + break; + } + + mutex_unlock(&unit_mutex); + + if (!found) + return -ENODEV; + + *private_data = unit->private_data; + *index = minor - unit->lowest_minor; + + return 0; +} +EXPORT_SYMBOL(xillybus_find_inode); + +static int __init xillybus_class_init(void) +{ + xillybus_class = class_create(THIS_MODULE, "xillybus"); + + if (IS_ERR(xillybus_class)) { + pr_warn("Failed to register xillybus class\n"); + + return PTR_ERR(xillybus_class); + } + return 0; +} + +static void __exit xillybus_class_exit(void) +{ + class_destroy(xillybus_class); +} + +module_init(xillybus_class_init); +module_exit(xillybus_class_exit); diff --git a/drivers/char/xillybus/xillybus_core.c b/drivers/char/xillybus/xillybus_core.c index 57fa68834981..57884fdd07d8 100644 --- a/drivers/char/xillybus/xillybus_core.c +++ b/drivers/char/xillybus/xillybus_core.c @@ -21,7 +21,6 @@ #include #include #include -#include #include #include #include @@ -30,10 +29,11 @@ #include #include #include "xillybus.h" +#include MODULE_DESCRIPTION("Xillybus core functions"); MODULE_AUTHOR("Eli Billauer, Xillybus Ltd."); -MODULE_VERSION("1.07"); +MODULE_VERSION("1.10"); MODULE_ALIAS("xillybus_core"); MODULE_LICENSE("GPL v2"); @@ -58,16 +58,6 @@ MODULE_LICENSE("GPL v2"); static const char xillyname[] = "xillybus"; -static struct class *xillybus_class; - -/* - * ep_list_lock is the last lock to be taken; No other lock requests are - * allowed while holding it. It merely protects list_of_endpoints, and not - * the endpoints listed in it. - */ - -static LIST_HEAD(list_of_endpoints); -static struct mutex ep_list_lock; static struct workqueue_struct *xillybus_wq; /* @@ -570,10 +560,8 @@ static int xilly_scan_idt(struct xilly_endpoint *endpoint, unsigned char *scan; int len; - scan = idt; - idt_handle->idt = idt; - - scan++; /* Skip version number */ + scan = idt + 1; + idt_handle->names = scan; while ((scan <= end_of_idt) && *scan) { while ((scan <= end_of_idt) && *scan++) @@ -581,6 +569,8 @@ static int xilly_scan_idt(struct xilly_endpoint *endpoint, count++; } + idt_handle->names_len = scan - idt_handle->names; + scan++; if (scan > end_of_idt) { @@ -1407,36 +1397,20 @@ static ssize_t xillybus_write(struct file *filp, const char __user *userbuf, static int xillybus_open(struct inode *inode, struct file *filp) { - int rc = 0; + int rc; unsigned long flags; - int minor = iminor(inode); - int major = imajor(inode); - struct xilly_endpoint *ep_iter, *endpoint = NULL; + struct xilly_endpoint *endpoint; struct xilly_channel *channel; + int index; - mutex_lock(&ep_list_lock); - - list_for_each_entry(ep_iter, &list_of_endpoints, ep_list) { - if ((ep_iter->major == major) && - (minor >= ep_iter->lowest_minor) && - (minor < (ep_iter->lowest_minor + - ep_iter->num_channels))) { - endpoint = ep_iter; - break; - } - } - mutex_unlock(&ep_list_lock); - - if (!endpoint) { - pr_err("xillybus: open() failed to find a device for major=%d and minor=%d\n", - major, minor); - return -ENODEV; - } + rc = xillybus_find_inode(inode, (void **)&endpoint, &index); + if (rc) + return rc; if (endpoint->fatal_error) return -EIO; - channel = endpoint->channels[1 + minor - endpoint->lowest_minor]; + channel = endpoint->channels[1 + index]; filp->private_data = channel; /* @@ -1799,95 +1773,6 @@ static const struct file_operations xillybus_fops = { .poll = xillybus_poll, }; -static int xillybus_init_chrdev(struct xilly_endpoint *endpoint, - const unsigned char *idt) -{ - int rc; - dev_t dev; - int devnum, i, minor, major; - char devname[48]; - struct device *device; - - rc = alloc_chrdev_region(&dev, 0, /* minor start */ - endpoint->num_channels, - xillyname); - if (rc) { - dev_warn(endpoint->dev, "Failed to obtain major/minors"); - return rc; - } - - endpoint->major = major = MAJOR(dev); - endpoint->lowest_minor = minor = MINOR(dev); - - cdev_init(&endpoint->cdev, &xillybus_fops); - endpoint->cdev.owner = endpoint->ephw->owner; - rc = cdev_add(&endpoint->cdev, MKDEV(major, minor), - endpoint->num_channels); - if (rc) { - dev_warn(endpoint->dev, "Failed to add cdev. Aborting.\n"); - goto unregister_chrdev; - } - - idt++; - - for (i = minor, devnum = 0; - devnum < endpoint->num_channels; - devnum++, i++) { - snprintf(devname, sizeof(devname)-1, "xillybus_%s", idt); - - devname[sizeof(devname)-1] = 0; /* Should never matter */ - - while (*idt++) - /* Skip to next */; - - device = device_create(xillybus_class, - NULL, - MKDEV(major, i), - NULL, - "%s", devname); - - if (IS_ERR(device)) { - dev_warn(endpoint->dev, - "Failed to create %s device. Aborting.\n", - devname); - rc = -ENODEV; - goto unroll_device_create; - } - } - - dev_info(endpoint->dev, "Created %d device files.\n", - endpoint->num_channels); - return 0; /* succeed */ - -unroll_device_create: - devnum--; i--; - for (; devnum >= 0; devnum--, i--) - device_destroy(xillybus_class, MKDEV(major, i)); - - cdev_del(&endpoint->cdev); -unregister_chrdev: - unregister_chrdev_region(MKDEV(major, minor), endpoint->num_channels); - - return rc; -} - -static void xillybus_cleanup_chrdev(struct xilly_endpoint *endpoint) -{ - int minor; - - for (minor = endpoint->lowest_minor; - minor < (endpoint->lowest_minor + endpoint->num_channels); - minor++) - device_destroy(xillybus_class, MKDEV(endpoint->major, minor)); - cdev_del(&endpoint->cdev); - unregister_chrdev_region(MKDEV(endpoint->major, - endpoint->lowest_minor), - endpoint->num_channels); - - dev_info(endpoint->dev, "Removed %d device files.\n", - endpoint->num_channels); -} - struct xilly_endpoint *xillybus_init_endpoint(struct pci_dev *pdev, struct device *dev, struct xilly_endpoint_hardware @@ -2027,28 +1912,20 @@ int xillybus_endpoint_discovery(struct xilly_endpoint *endpoint) if (rc) goto failed_idt; - /* - * endpoint is now completely configured. We put it on the list - * available to open() before registering the char device(s) - */ - - mutex_lock(&ep_list_lock); - list_add_tail(&endpoint->ep_list, &list_of_endpoints); - mutex_unlock(&ep_list_lock); + rc = xillybus_init_chrdev(dev, &xillybus_fops, + endpoint->ephw->owner, endpoint, + idt_handle.names, + idt_handle.names_len, + endpoint->num_channels, + xillyname, false); - rc = xillybus_init_chrdev(endpoint, idt_handle.idt); if (rc) - goto failed_chrdevs; + goto failed_idt; devres_release_group(dev, bootstrap_resources); return 0; -failed_chrdevs: - mutex_lock(&ep_list_lock); - list_del(&endpoint->ep_list); - mutex_unlock(&ep_list_lock); - failed_idt: xilly_quiesce(endpoint); flush_workqueue(xillybus_wq); @@ -2059,11 +1936,7 @@ EXPORT_SYMBOL(xillybus_endpoint_discovery); void xillybus_endpoint_remove(struct xilly_endpoint *endpoint) { - xillybus_cleanup_chrdev(endpoint); - - mutex_lock(&ep_list_lock); - list_del(&endpoint->ep_list); - mutex_unlock(&ep_list_lock); + xillybus_cleanup_chrdev(endpoint, endpoint->dev); xilly_quiesce(endpoint); @@ -2077,17 +1950,9 @@ EXPORT_SYMBOL(xillybus_endpoint_remove); static int __init xillybus_init(void) { - mutex_init(&ep_list_lock); - - xillybus_class = class_create(THIS_MODULE, xillyname); - if (IS_ERR(xillybus_class)) - return PTR_ERR(xillybus_class); - xillybus_wq = alloc_workqueue(xillyname, 0, 0); - if (!xillybus_wq) { - class_destroy(xillybus_class); + if (!xillybus_wq) return -ENOMEM; - } return 0; } @@ -2096,8 +1961,6 @@ static void __exit xillybus_exit(void) { /* flush_workqueue() was called for each endpoint released */ destroy_workqueue(xillybus_wq); - - class_destroy(xillybus_class); } module_init(xillybus_init); diff --git a/include/linux/xillybus_class.h b/include/linux/xillybus_class.h new file mode 100644 index 000000000000..5dbfdfc95c65 --- /dev/null +++ b/include/linux/xillybus_class.h @@ -0,0 +1,30 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* + * Copyright 2021 Xillybus Ltd, http://www.xillybus.com + * + * Header file for the Xillybus class + */ + +#ifndef __XILLYBUS_CLASS_H +#define __XILLYBUS_CLASS_H + +#include +#include +#include +#include + +int xillybus_init_chrdev(struct device *dev, + const struct file_operations *fops, + struct module *owner, + void *private_data, + unsigned char *idt, unsigned int len, + int num_nodes, + const char *prefix, bool enumerate); + +void xillybus_cleanup_chrdev(void *private_data, + struct device *dev); + +int xillybus_find_inode(struct inode *inode, + void **private_data, int *index); + +#endif /* __XILLYBUS_CLASS_H */