| // SPDX-License-Identifier: GPL-2.0 |
| /* |
| * Copyright (c) 2012-2023, Intel Corporation. All rights reserved. |
| * Intel Management Engine Interface (Intel MEI) Linux driver |
| */ |
| |
| #include <linux/module.h> |
| #include <linux/device.h> |
| #include <linux/kernel.h> |
| #include <linux/sched/signal.h> |
| #include <linux/init.h> |
| #include <linux/errno.h> |
| #include <linux/slab.h> |
| #include <linux/mutex.h> |
| #include <linux/interrupt.h> |
| #include <linux/scatterlist.h> |
| #include <linux/mei_cl_bus.h> |
| |
| #include "mei_dev.h" |
| #include "client.h" |
| |
| #define to_mei_cl_driver(d) container_of(d, struct mei_cl_driver, driver) |
| |
| /** |
| * __mei_cl_send - internal client send (write) |
| * |
| * @cl: host client |
| * @buf: buffer to send |
| * @length: buffer length |
| * @vtag: virtual tag |
| * @mode: sending mode |
| * |
| * Return: written size bytes or < 0 on error |
| */ |
| ssize_t __mei_cl_send(struct mei_cl *cl, const u8 *buf, size_t length, u8 vtag, |
| unsigned int mode) |
| { |
| return __mei_cl_send_timeout(cl, buf, length, vtag, mode, MAX_SCHEDULE_TIMEOUT); |
| } |
| |
| /** |
| * __mei_cl_send_timeout - internal client send (write) |
| * |
| * @cl: host client |
| * @buf: buffer to send |
| * @length: buffer length |
| * @vtag: virtual tag |
| * @mode: sending mode |
| * @timeout: send timeout in milliseconds. |
| * effective only for blocking writes: the MEI_CL_IO_TX_BLOCKING mode bit is set. |
| * set timeout to the MAX_SCHEDULE_TIMEOUT to maixum allowed wait. |
| * |
| * Return: written size bytes or < 0 on error |
| */ |
| ssize_t __mei_cl_send_timeout(struct mei_cl *cl, const u8 *buf, size_t length, u8 vtag, |
| unsigned int mode, unsigned long timeout) |
| { |
| struct mei_device *bus; |
| struct mei_cl_cb *cb; |
| ssize_t rets; |
| |
| if (WARN_ON(!cl || !cl->dev)) |
| return -ENODEV; |
| |
| bus = cl->dev; |
| |
| mutex_lock(&bus->device_lock); |
| if (bus->dev_state != MEI_DEV_ENABLED && |
| bus->dev_state != MEI_DEV_POWERING_DOWN) { |
| rets = -ENODEV; |
| goto out; |
| } |
| |
| if (!mei_cl_is_connected(cl)) { |
| rets = -ENODEV; |
| goto out; |
| } |
| |
| /* Check if we have an ME client device */ |
| if (!mei_me_cl_is_active(cl->me_cl)) { |
| rets = -ENOTTY; |
| goto out; |
| } |
| |
| if (vtag) { |
| /* Check if vtag is supported by client */ |
| rets = mei_cl_vt_support_check(cl); |
| if (rets) |
| goto out; |
| } |
| |
| if (length > mei_cl_mtu(cl)) { |
| rets = -EFBIG; |
| goto out; |
| } |
| |
| while (cl->tx_cb_queued >= bus->tx_queue_limit) { |
| mutex_unlock(&bus->device_lock); |
| rets = wait_event_interruptible(cl->tx_wait, |
| cl->writing_state == MEI_WRITE_COMPLETE || |
| (!mei_cl_is_connected(cl))); |
| mutex_lock(&bus->device_lock); |
| if (rets) { |
| if (signal_pending(current)) |
| rets = -EINTR; |
| goto out; |
| } |
| if (!mei_cl_is_connected(cl)) { |
| rets = -ENODEV; |
| goto out; |
| } |
| } |
| |
| cb = mei_cl_alloc_cb(cl, length, MEI_FOP_WRITE, NULL); |
| if (!cb) { |
| rets = -ENOMEM; |
| goto out; |
| } |
| cb->vtag = vtag; |
| |
| cb->internal = !!(mode & MEI_CL_IO_TX_INTERNAL); |
| cb->blocking = !!(mode & MEI_CL_IO_TX_BLOCKING); |
| memcpy(cb->buf.data, buf, length); |
| /* hack we point data to header */ |
| if (mode & MEI_CL_IO_SGL) { |
| cb->ext_hdr = (struct mei_ext_hdr *)cb->buf.data; |
| cb->buf.data = NULL; |
| cb->buf.size = 0; |
| } |
| |
| rets = mei_cl_write(cl, cb, timeout); |
| |
| if (mode & MEI_CL_IO_SGL && rets == 0) |
| rets = length; |
| |
| out: |
| mutex_unlock(&bus->device_lock); |
| |
| return rets; |
| } |
| |
| /** |
| * __mei_cl_recv - internal client receive (read) |
| * |
| * @cl: host client |
| * @buf: buffer to receive |
| * @length: buffer length |
| * @mode: io mode |
| * @vtag: virtual tag |
| * @timeout: recv timeout, 0 for infinite timeout |
| * |
| * Return: read size in bytes of < 0 on error |
| */ |
| ssize_t __mei_cl_recv(struct mei_cl *cl, u8 *buf, size_t length, u8 *vtag, |
| unsigned int mode, unsigned long timeout) |
| { |
| struct mei_device *bus; |
| struct mei_cl_cb *cb; |
| size_t r_length; |
| ssize_t rets; |
| bool nonblock = !!(mode & MEI_CL_IO_RX_NONBLOCK); |
| |
| if (WARN_ON(!cl || !cl->dev)) |
| return -ENODEV; |
| |
| bus = cl->dev; |
| |
| mutex_lock(&bus->device_lock); |
| if (bus->dev_state != MEI_DEV_ENABLED && |
| bus->dev_state != MEI_DEV_POWERING_DOWN) { |
| rets = -ENODEV; |
| goto out; |
| } |
| |
| cb = mei_cl_read_cb(cl, NULL); |
| if (cb) |
| goto copy; |
| |
| rets = mei_cl_read_start(cl, length, NULL); |
| if (rets && rets != -EBUSY) |
| goto out; |
| |
| if (nonblock) { |
| rets = -EAGAIN; |
| goto out; |
| } |
| |
| /* wait on event only if there is no other waiter */ |
| /* synchronized under device mutex */ |
| if (!waitqueue_active(&cl->rx_wait)) { |
| |
| mutex_unlock(&bus->device_lock); |
| |
| if (timeout) { |
| rets = wait_event_interruptible_timeout |
| (cl->rx_wait, |
| mei_cl_read_cb(cl, NULL) || |
| (!mei_cl_is_connected(cl)), |
| msecs_to_jiffies(timeout)); |
| if (rets == 0) |
| return -ETIME; |
| if (rets < 0) { |
| if (signal_pending(current)) |
| return -EINTR; |
| return -ERESTARTSYS; |
| } |
| } else { |
| if (wait_event_interruptible |
| (cl->rx_wait, |
| mei_cl_read_cb(cl, NULL) || |
| (!mei_cl_is_connected(cl)))) { |
| if (signal_pending(current)) |
| return -EINTR; |
| return -ERESTARTSYS; |
| } |
| } |
| |
| mutex_lock(&bus->device_lock); |
| |
| if (!mei_cl_is_connected(cl)) { |
| rets = -ENODEV; |
| goto out; |
| } |
| } |
| |
| cb = mei_cl_read_cb(cl, NULL); |
| if (!cb) { |
| rets = 0; |
| goto out; |
| } |
| |
| copy: |
| if (cb->status) { |
| rets = cb->status; |
| goto free; |
| } |
| |
| /* for the GSC type - copy the extended header to the buffer */ |
| if (cb->ext_hdr && cb->ext_hdr->type == MEI_EXT_HDR_GSC) { |
| r_length = min_t(size_t, length, cb->ext_hdr->length * sizeof(u32)); |
| memcpy(buf, cb->ext_hdr, r_length); |
| } else { |
| r_length = min_t(size_t, length, cb->buf_idx); |
| memcpy(buf, cb->buf.data, r_length); |
| } |
| rets = r_length; |
| |
| if (vtag) |
| *vtag = cb->vtag; |
| |
| free: |
| mei_cl_del_rd_completed(cl, cb); |
| out: |
| mutex_unlock(&bus->device_lock); |
| |
| return rets; |
| } |
| |
| /** |
| * mei_cldev_send_vtag - me device send with vtag (write) |
| * |
| * @cldev: me client device |
| * @buf: buffer to send |
| * @length: buffer length |
| * @vtag: virtual tag |
| * |
| * Return: |
| * * written size in bytes |
| * * < 0 on error |
| */ |
| |
| ssize_t mei_cldev_send_vtag(struct mei_cl_device *cldev, const u8 *buf, |
| size_t length, u8 vtag) |
| { |
| struct mei_cl *cl = cldev->cl; |
| |
| return __mei_cl_send(cl, buf, length, vtag, MEI_CL_IO_TX_BLOCKING); |
| } |
| EXPORT_SYMBOL_GPL(mei_cldev_send_vtag); |
| |
| /** |
| * mei_cldev_send_vtag_timeout - me device send with vtag and timeout (write) |
| * |
| * @cldev: me client device |
| * @buf: buffer to send |
| * @length: buffer length |
| * @vtag: virtual tag |
| * @timeout: send timeout in milliseconds, 0 for infinite timeout |
| * |
| * Return: |
| * * written size in bytes |
| * * < 0 on error |
| */ |
| |
| ssize_t mei_cldev_send_vtag_timeout(struct mei_cl_device *cldev, const u8 *buf, |
| size_t length, u8 vtag, unsigned long timeout) |
| { |
| struct mei_cl *cl = cldev->cl; |
| |
| return __mei_cl_send_timeout(cl, buf, length, vtag, MEI_CL_IO_TX_BLOCKING, timeout); |
| } |
| EXPORT_SYMBOL_GPL(mei_cldev_send_vtag_timeout); |
| |
| /** |
| * mei_cldev_recv_vtag - client receive with vtag (read) |
| * |
| * @cldev: me client device |
| * @buf: buffer to receive |
| * @length: buffer length |
| * @vtag: virtual tag |
| * |
| * Return: |
| * * read size in bytes |
| * * < 0 on error |
| */ |
| |
| ssize_t mei_cldev_recv_vtag(struct mei_cl_device *cldev, u8 *buf, size_t length, |
| u8 *vtag) |
| { |
| struct mei_cl *cl = cldev->cl; |
| |
| return __mei_cl_recv(cl, buf, length, vtag, 0, 0); |
| } |
| EXPORT_SYMBOL_GPL(mei_cldev_recv_vtag); |
| |
| /** |
| * mei_cldev_recv_nonblock_vtag - non block client receive with vtag (read) |
| * |
| * @cldev: me client device |
| * @buf: buffer to receive |
| * @length: buffer length |
| * @vtag: virtual tag |
| * |
| * Return: |
| * * read size in bytes |
| * * -EAGAIN if function will block. |
| * * < 0 on other error |
| */ |
| ssize_t mei_cldev_recv_nonblock_vtag(struct mei_cl_device *cldev, u8 *buf, |
| size_t length, u8 *vtag) |
| { |
| struct mei_cl *cl = cldev->cl; |
| |
| return __mei_cl_recv(cl, buf, length, vtag, MEI_CL_IO_RX_NONBLOCK, 0); |
| } |
| EXPORT_SYMBOL_GPL(mei_cldev_recv_nonblock_vtag); |
| |
| /** |
| * mei_cldev_recv_timeout - client receive with timeout (read) |
| * |
| * @cldev: me client device |
| * @buf: buffer to receive |
| * @length: buffer length |
| * @timeout: send timeout in milliseconds, 0 for infinite timeout |
| * |
| * Return: |
| * * read size in bytes |
| * * < 0 on error |
| */ |
| ssize_t mei_cldev_recv_timeout(struct mei_cl_device *cldev, u8 *buf, size_t length, |
| unsigned long timeout) |
| { |
| return mei_cldev_recv_vtag_timeout(cldev, buf, length, NULL, timeout); |
| } |
| EXPORT_SYMBOL_GPL(mei_cldev_recv_timeout); |
| |
| /** |
| * mei_cldev_recv_vtag_timeout - client receive with vtag (read) |
| * |
| * @cldev: me client device |
| * @buf: buffer to receive |
| * @length: buffer length |
| * @vtag: virtual tag |
| * @timeout: recv timeout in milliseconds, 0 for infinite timeout |
| * |
| * Return: |
| * * read size in bytes |
| * * < 0 on error |
| */ |
| |
| ssize_t mei_cldev_recv_vtag_timeout(struct mei_cl_device *cldev, u8 *buf, size_t length, |
| u8 *vtag, unsigned long timeout) |
| { |
| struct mei_cl *cl = cldev->cl; |
| |
| return __mei_cl_recv(cl, buf, length, vtag, 0, timeout); |
| } |
| EXPORT_SYMBOL_GPL(mei_cldev_recv_vtag_timeout); |
| |
| /** |
| * mei_cldev_send - me device send (write) |
| * |
| * @cldev: me client device |
| * @buf: buffer to send |
| * @length: buffer length |
| * |
| * Return: |
| * * written size in bytes |
| * * < 0 on error |
| */ |
| ssize_t mei_cldev_send(struct mei_cl_device *cldev, const u8 *buf, size_t length) |
| { |
| return mei_cldev_send_vtag(cldev, buf, length, 0); |
| } |
| EXPORT_SYMBOL_GPL(mei_cldev_send); |
| |
| /** |
| * mei_cldev_send_timeout - me device send with timeout (write) |
| * |
| * @cldev: me client device |
| * @buf: buffer to send |
| * @length: buffer length |
| * @timeout: send timeout in milliseconds, 0 for infinite timeout |
| * |
| * Return: |
| * * written size in bytes |
| * * < 0 on error |
| */ |
| ssize_t mei_cldev_send_timeout(struct mei_cl_device *cldev, const u8 *buf, size_t length, |
| unsigned long timeout) |
| { |
| return mei_cldev_send_vtag_timeout(cldev, buf, length, 0, timeout); |
| } |
| EXPORT_SYMBOL_GPL(mei_cldev_send_timeout); |
| |
| /** |
| * mei_cldev_recv - client receive (read) |
| * |
| * @cldev: me client device |
| * @buf: buffer to receive |
| * @length: buffer length |
| * |
| * Return: read size in bytes of < 0 on error |
| */ |
| ssize_t mei_cldev_recv(struct mei_cl_device *cldev, u8 *buf, size_t length) |
| { |
| return mei_cldev_recv_vtag(cldev, buf, length, NULL); |
| } |
| EXPORT_SYMBOL_GPL(mei_cldev_recv); |
| |
| /** |
| * mei_cldev_recv_nonblock - non block client receive (read) |
| * |
| * @cldev: me client device |
| * @buf: buffer to receive |
| * @length: buffer length |
| * |
| * Return: read size in bytes of < 0 on error |
| * -EAGAIN if function will block. |
| */ |
| ssize_t mei_cldev_recv_nonblock(struct mei_cl_device *cldev, u8 *buf, |
| size_t length) |
| { |
| return mei_cldev_recv_nonblock_vtag(cldev, buf, length, NULL); |
| } |
| EXPORT_SYMBOL_GPL(mei_cldev_recv_nonblock); |
| |
| /** |
| * mei_cl_bus_rx_work - dispatch rx event for a bus device |
| * |
| * @work: work |
| */ |
| static void mei_cl_bus_rx_work(struct work_struct *work) |
| { |
| struct mei_cl_device *cldev; |
| struct mei_device *bus; |
| |
| cldev = container_of(work, struct mei_cl_device, rx_work); |
| |
| bus = cldev->bus; |
| |
| if (cldev->rx_cb) |
| cldev->rx_cb(cldev); |
| |
| mutex_lock(&bus->device_lock); |
| if (mei_cl_is_connected(cldev->cl)) |
| mei_cl_read_start(cldev->cl, mei_cl_mtu(cldev->cl), NULL); |
| mutex_unlock(&bus->device_lock); |
| } |
| |
| /** |
| * mei_cl_bus_notif_work - dispatch FW notif event for a bus device |
| * |
| * @work: work |
| */ |
| static void mei_cl_bus_notif_work(struct work_struct *work) |
| { |
| struct mei_cl_device *cldev; |
| |
| cldev = container_of(work, struct mei_cl_device, notif_work); |
| |
| if (cldev->notif_cb) |
| cldev->notif_cb(cldev); |
| } |
| |
| /** |
| * mei_cl_bus_notify_event - schedule notify cb on bus client |
| * |
| * @cl: host client |
| * |
| * Return: true if event was scheduled |
| * false if the client is not waiting for event |
| */ |
| bool mei_cl_bus_notify_event(struct mei_cl *cl) |
| { |
| struct mei_cl_device *cldev = cl->cldev; |
| |
| if (!cldev || !cldev->notif_cb) |
| return false; |
| |
| if (!cl->notify_ev) |
| return false; |
| |
| schedule_work(&cldev->notif_work); |
| |
| cl->notify_ev = false; |
| |
| return true; |
| } |
| |
| /** |
| * mei_cl_bus_rx_event - schedule rx event |
| * |
| * @cl: host client |
| * |
| * Return: true if event was scheduled |
| * false if the client is not waiting for event |
| */ |
| bool mei_cl_bus_rx_event(struct mei_cl *cl) |
| { |
| struct mei_cl_device *cldev = cl->cldev; |
| |
| if (!cldev || !cldev->rx_cb) |
| return false; |
| |
| schedule_work(&cldev->rx_work); |
| |
| return true; |
| } |
| |
| /** |
| * mei_cldev_register_rx_cb - register Rx event callback |
| * |
| * @cldev: me client devices |
| * @rx_cb: callback function |
| * |
| * Return: 0 on success |
| * -EALREADY if an callback is already registered |
| * <0 on other errors |
| */ |
| int mei_cldev_register_rx_cb(struct mei_cl_device *cldev, mei_cldev_cb_t rx_cb) |
| { |
| struct mei_device *bus = cldev->bus; |
| int ret; |
| |
| if (!rx_cb) |
| return -EINVAL; |
| if (cldev->rx_cb) |
| return -EALREADY; |
| |
| cldev->rx_cb = rx_cb; |
| INIT_WORK(&cldev->rx_work, mei_cl_bus_rx_work); |
| |
| mutex_lock(&bus->device_lock); |
| if (mei_cl_is_connected(cldev->cl)) |
| ret = mei_cl_read_start(cldev->cl, mei_cl_mtu(cldev->cl), NULL); |
| else |
| ret = -ENODEV; |
| mutex_unlock(&bus->device_lock); |
| if (ret && ret != -EBUSY) { |
| cancel_work_sync(&cldev->rx_work); |
| cldev->rx_cb = NULL; |
| return ret; |
| } |
| |
| return 0; |
| } |
| EXPORT_SYMBOL_GPL(mei_cldev_register_rx_cb); |
| |
| /** |
| * mei_cldev_register_notif_cb - register FW notification event callback |
| * |
| * @cldev: me client devices |
| * @notif_cb: callback function |
| * |
| * Return: 0 on success |
| * -EALREADY if an callback is already registered |
| * <0 on other errors |
| */ |
| int mei_cldev_register_notif_cb(struct mei_cl_device *cldev, |
| mei_cldev_cb_t notif_cb) |
| { |
| struct mei_device *bus = cldev->bus; |
| int ret; |
| |
| if (!notif_cb) |
| return -EINVAL; |
| |
| if (cldev->notif_cb) |
| return -EALREADY; |
| |
| cldev->notif_cb = notif_cb; |
| INIT_WORK(&cldev->notif_work, mei_cl_bus_notif_work); |
| |
| mutex_lock(&bus->device_lock); |
| ret = mei_cl_notify_request(cldev->cl, NULL, 1); |
| mutex_unlock(&bus->device_lock); |
| if (ret) { |
| cancel_work_sync(&cldev->notif_work); |
| cldev->notif_cb = NULL; |
| return ret; |
| } |
| |
| return 0; |
| } |
| EXPORT_SYMBOL_GPL(mei_cldev_register_notif_cb); |
| |
| /** |
| * mei_cldev_get_drvdata - driver data getter |
| * |
| * @cldev: mei client device |
| * |
| * Return: driver private data |
| */ |
| void *mei_cldev_get_drvdata(const struct mei_cl_device *cldev) |
| { |
| return dev_get_drvdata(&cldev->dev); |
| } |
| EXPORT_SYMBOL_GPL(mei_cldev_get_drvdata); |
| |
| /** |
| * mei_cldev_set_drvdata - driver data setter |
| * |
| * @cldev: mei client device |
| * @data: data to store |
| */ |
| void mei_cldev_set_drvdata(struct mei_cl_device *cldev, void *data) |
| { |
| dev_set_drvdata(&cldev->dev, data); |
| } |
| EXPORT_SYMBOL_GPL(mei_cldev_set_drvdata); |
| |
| /** |
| * mei_cldev_uuid - return uuid of the underlying me client |
| * |
| * @cldev: mei client device |
| * |
| * Return: me client uuid |
| */ |
| const uuid_le *mei_cldev_uuid(const struct mei_cl_device *cldev) |
| { |
| return mei_me_cl_uuid(cldev->me_cl); |
| } |
| EXPORT_SYMBOL_GPL(mei_cldev_uuid); |
| |
| /** |
| * mei_cldev_ver - return protocol version of the underlying me client |
| * |
| * @cldev: mei client device |
| * |
| * Return: me client protocol version |
| */ |
| u8 mei_cldev_ver(const struct mei_cl_device *cldev) |
| { |
| return mei_me_cl_ver(cldev->me_cl); |
| } |
| EXPORT_SYMBOL_GPL(mei_cldev_ver); |
| |
| /** |
| * mei_cldev_enabled - check whether the device is enabled |
| * |
| * @cldev: mei client device |
| * |
| * Return: true if me client is initialized and connected |
| */ |
| bool mei_cldev_enabled(const struct mei_cl_device *cldev) |
| { |
| return mei_cl_is_connected(cldev->cl); |
| } |
| EXPORT_SYMBOL_GPL(mei_cldev_enabled); |
| |
| /** |
| * mei_cl_bus_module_get - acquire module of the underlying |
| * hw driver. |
| * |
| * @cldev: mei client device |
| * |
| * Return: true on success; false if the module was removed. |
| */ |
| static bool mei_cl_bus_module_get(struct mei_cl_device *cldev) |
| { |
| return try_module_get(cldev->bus->dev->driver->owner); |
| } |
| |
| /** |
| * mei_cl_bus_module_put - release the underlying hw module. |
| * |
| * @cldev: mei client device |
| */ |
| static void mei_cl_bus_module_put(struct mei_cl_device *cldev) |
| { |
| module_put(cldev->bus->dev->driver->owner); |
| } |
| |
| /** |
| * mei_cl_bus_vtag - get bus vtag entry wrapper |
| * The tag for bus client is always first. |
| * |
| * @cl: host client |
| * |
| * Return: bus vtag or NULL |
| */ |
| static inline struct mei_cl_vtag *mei_cl_bus_vtag(struct mei_cl *cl) |
| { |
| return list_first_entry_or_null(&cl->vtag_map, |
| struct mei_cl_vtag, list); |
| } |
| |
| /** |
| * mei_cl_bus_vtag_alloc - add bus client entry to vtag map |
| * |
| * @cldev: me client device |
| * |
| * Return: |
| * * 0 on success |
| * * -ENOMEM if memory allocation failed |
| */ |
| static int mei_cl_bus_vtag_alloc(struct mei_cl_device *cldev) |
| { |
| struct mei_cl *cl = cldev->cl; |
| struct mei_cl_vtag *cl_vtag; |
| |
| /* |
| * Bail out if the client does not supports vtags |
| * or has already allocated one |
| */ |
| if (mei_cl_vt_support_check(cl) || mei_cl_bus_vtag(cl)) |
| return 0; |
| |
| cl_vtag = mei_cl_vtag_alloc(NULL, 0); |
| if (IS_ERR(cl_vtag)) |
| return -ENOMEM; |
| |
| list_add_tail(&cl_vtag->list, &cl->vtag_map); |
| |
| return 0; |
| } |
| |
| /** |
| * mei_cl_bus_vtag_free - remove the bus entry from vtag map |
| * |
| * @cldev: me client device |
| */ |
| static void mei_cl_bus_vtag_free(struct mei_cl_device *cldev) |
| { |
| struct mei_cl *cl = cldev->cl; |
| struct mei_cl_vtag *cl_vtag; |
| |
| cl_vtag = mei_cl_bus_vtag(cl); |
| if (!cl_vtag) |
| return; |
| |
| list_del(&cl_vtag->list); |
| kfree(cl_vtag); |
| } |
| |
| void *mei_cldev_dma_map(struct mei_cl_device *cldev, u8 buffer_id, size_t size) |
| { |
| struct mei_device *bus; |
| struct mei_cl *cl; |
| int ret; |
| |
| if (!cldev || !buffer_id || !size) |
| return ERR_PTR(-EINVAL); |
| |
| if (!IS_ALIGNED(size, MEI_FW_PAGE_SIZE)) { |
| dev_err(&cldev->dev, "Map size should be aligned to %lu\n", |
| MEI_FW_PAGE_SIZE); |
| return ERR_PTR(-EINVAL); |
| } |
| |
| cl = cldev->cl; |
| bus = cldev->bus; |
| |
| mutex_lock(&bus->device_lock); |
| if (cl->state == MEI_FILE_UNINITIALIZED) { |
| ret = mei_cl_link(cl); |
| if (ret) |
| goto notlinked; |
| /* update pointers */ |
| cl->cldev = cldev; |
| } |
| |
| ret = mei_cl_dma_alloc_and_map(cl, NULL, buffer_id, size); |
| if (ret) |
| mei_cl_unlink(cl); |
| notlinked: |
| mutex_unlock(&bus->device_lock); |
| if (ret) |
| return ERR_PTR(ret); |
| return cl->dma.vaddr; |
| } |
| EXPORT_SYMBOL_GPL(mei_cldev_dma_map); |
| |
| int mei_cldev_dma_unmap(struct mei_cl_device *cldev) |
| { |
| struct mei_device *bus; |
| struct mei_cl *cl; |
| int ret; |
| |
| if (!cldev) |
| return -EINVAL; |
| |
| cl = cldev->cl; |
| bus = cldev->bus; |
| |
| mutex_lock(&bus->device_lock); |
| ret = mei_cl_dma_unmap(cl, NULL); |
| |
| mei_cl_flush_queues(cl, NULL); |
| mei_cl_unlink(cl); |
| mutex_unlock(&bus->device_lock); |
| return ret; |
| } |
| EXPORT_SYMBOL_GPL(mei_cldev_dma_unmap); |
| |
| /** |
| * mei_cldev_enable - enable me client device |
| * create connection with me client |
| * |
| * @cldev: me client device |
| * |
| * Return: 0 on success and < 0 on error |
| */ |
| int mei_cldev_enable(struct mei_cl_device *cldev) |
| { |
| struct mei_device *bus = cldev->bus; |
| struct mei_cl *cl; |
| int ret; |
| |
| cl = cldev->cl; |
| |
| mutex_lock(&bus->device_lock); |
| if (cl->state == MEI_FILE_UNINITIALIZED) { |
| ret = mei_cl_link(cl); |
| if (ret) |
| goto notlinked; |
| /* update pointers */ |
| cl->cldev = cldev; |
| } |
| |
| if (mei_cl_is_connected(cl)) { |
| ret = 0; |
| goto out; |
| } |
| |
| if (!mei_me_cl_is_active(cldev->me_cl)) { |
| dev_err(&cldev->dev, "me client is not active\n"); |
| ret = -ENOTTY; |
| goto out; |
| } |
| |
| ret = mei_cl_bus_vtag_alloc(cldev); |
| if (ret) |
| goto out; |
| |
| ret = mei_cl_connect(cl, cldev->me_cl, NULL); |
| if (ret < 0) { |
| dev_err(&cldev->dev, "cannot connect\n"); |
| mei_cl_bus_vtag_free(cldev); |
| } |
| |
| out: |
| if (ret) |
| mei_cl_unlink(cl); |
| notlinked: |
| mutex_unlock(&bus->device_lock); |
| |
| return ret; |
| } |
| EXPORT_SYMBOL_GPL(mei_cldev_enable); |
| |
| /** |
| * mei_cldev_unregister_callbacks - internal wrapper for unregistering |
| * callbacks. |
| * |
| * @cldev: client device |
| */ |
| static void mei_cldev_unregister_callbacks(struct mei_cl_device *cldev) |
| { |
| if (cldev->rx_cb) { |
| cancel_work_sync(&cldev->rx_work); |
| cldev->rx_cb = NULL; |
| } |
| |
| if (cldev->notif_cb) { |
| cancel_work_sync(&cldev->notif_work); |
| cldev->notif_cb = NULL; |
| } |
| } |
| |
| /** |
| * mei_cldev_disable - disable me client device |
| * disconnect form the me client |
| * |
| * @cldev: me client device |
| * |
| * Return: 0 on success and < 0 on error |
| */ |
| int mei_cldev_disable(struct mei_cl_device *cldev) |
| { |
| struct mei_device *bus; |
| struct mei_cl *cl; |
| int err; |
| |
| if (!cldev) |
| return -ENODEV; |
| |
| cl = cldev->cl; |
| |
| bus = cldev->bus; |
| |
| mei_cldev_unregister_callbacks(cldev); |
| |
| mutex_lock(&bus->device_lock); |
| |
| mei_cl_bus_vtag_free(cldev); |
| |
| if (!mei_cl_is_connected(cl)) { |
| dev_dbg(bus->dev, "Already disconnected\n"); |
| err = 0; |
| goto out; |
| } |
| |
| err = mei_cl_disconnect(cl); |
| if (err < 0) |
| dev_err(bus->dev, "Could not disconnect from the ME client\n"); |
| |
| out: |
| /* Flush queues and remove any pending read unless we have mapped DMA */ |
| if (!cl->dma_mapped) { |
| mei_cl_flush_queues(cl, NULL); |
| mei_cl_unlink(cl); |
| } |
| |
| mutex_unlock(&bus->device_lock); |
| return err; |
| } |
| EXPORT_SYMBOL_GPL(mei_cldev_disable); |
| |
| /** |
| * mei_cldev_send_gsc_command - sends a gsc command, by sending |
| * a gsl mei message to gsc and receiving reply from gsc |
| * |
| * @cldev: me client device |
| * @client_id: client id to send the command to |
| * @fence_id: fence id to send the command to |
| * @sg_in: scatter gather list containing addresses for rx message buffer |
| * @total_in_len: total length of data in 'in' sg, can be less than the sum of buffers sizes |
| * @sg_out: scatter gather list containing addresses for tx message buffer |
| * |
| * Return: |
| * * written size in bytes |
| * * < 0 on error |
| */ |
| ssize_t mei_cldev_send_gsc_command(struct mei_cl_device *cldev, |
| u8 client_id, u32 fence_id, |
| struct scatterlist *sg_in, |
| size_t total_in_len, |
| struct scatterlist *sg_out) |
| { |
| struct mei_cl *cl; |
| struct mei_device *bus; |
| ssize_t ret = 0; |
| |
| struct mei_ext_hdr_gsc_h2f *ext_hdr; |
| size_t buf_sz = sizeof(struct mei_ext_hdr_gsc_h2f); |
| int sg_out_nents, sg_in_nents; |
| int i; |
| struct scatterlist *sg; |
| struct mei_ext_hdr_gsc_f2h rx_msg; |
| unsigned int sg_len; |
| |
| if (!cldev || !sg_in || !sg_out) |
| return -EINVAL; |
| |
| cl = cldev->cl; |
| bus = cldev->bus; |
| |
| dev_dbg(bus->dev, "client_id %u, fence_id %u\n", client_id, fence_id); |
| |
| if (!bus->hbm_f_gsc_supported) |
| return -EOPNOTSUPP; |
| |
| sg_out_nents = sg_nents(sg_out); |
| sg_in_nents = sg_nents(sg_in); |
| /* at least one entry in tx and rx sgls must be present */ |
| if (sg_out_nents <= 0 || sg_in_nents <= 0) |
| return -EINVAL; |
| |
| buf_sz += (sg_out_nents + sg_in_nents) * sizeof(struct mei_gsc_sgl); |
| ext_hdr = kzalloc(buf_sz, GFP_KERNEL); |
| if (!ext_hdr) |
| return -ENOMEM; |
| |
| /* construct the GSC message */ |
| ext_hdr->hdr.type = MEI_EXT_HDR_GSC; |
| ext_hdr->hdr.length = buf_sz / sizeof(u32); /* length is in dw */ |
| |
| ext_hdr->client_id = client_id; |
| ext_hdr->addr_type = GSC_ADDRESS_TYPE_PHYSICAL_SGL; |
| ext_hdr->fence_id = fence_id; |
| ext_hdr->input_address_count = sg_in_nents; |
| ext_hdr->output_address_count = sg_out_nents; |
| ext_hdr->reserved[0] = 0; |
| ext_hdr->reserved[1] = 0; |
| |
| /* copy in-sgl to the message */ |
| for (i = 0, sg = sg_in; i < sg_in_nents; i++, sg++) { |
| ext_hdr->sgl[i].low = lower_32_bits(sg_dma_address(sg)); |
| ext_hdr->sgl[i].high = upper_32_bits(sg_dma_address(sg)); |
| sg_len = min_t(unsigned int, sg_dma_len(sg), PAGE_SIZE); |
| ext_hdr->sgl[i].length = (sg_len <= total_in_len) ? sg_len : total_in_len; |
| total_in_len -= ext_hdr->sgl[i].length; |
| } |
| |
| /* copy out-sgl to the message */ |
| for (i = sg_in_nents, sg = sg_out; i < sg_in_nents + sg_out_nents; i++, sg++) { |
| ext_hdr->sgl[i].low = lower_32_bits(sg_dma_address(sg)); |
| ext_hdr->sgl[i].high = upper_32_bits(sg_dma_address(sg)); |
| sg_len = min_t(unsigned int, sg_dma_len(sg), PAGE_SIZE); |
| ext_hdr->sgl[i].length = sg_len; |
| } |
| |
| /* send the message to GSC */ |
| ret = __mei_cl_send(cl, (u8 *)ext_hdr, buf_sz, 0, MEI_CL_IO_SGL); |
| if (ret < 0) { |
| dev_err(bus->dev, "__mei_cl_send failed, returned %zd\n", ret); |
| goto end; |
| } |
| if (ret != buf_sz) { |
| dev_err(bus->dev, "__mei_cl_send returned %zd instead of expected %zd\n", |
| ret, buf_sz); |
| ret = -EIO; |
| goto end; |
| } |
| |
| /* receive the reply from GSC, note that at this point sg_in should contain the reply */ |
| ret = __mei_cl_recv(cl, (u8 *)&rx_msg, sizeof(rx_msg), NULL, MEI_CL_IO_SGL, 0); |
| |
| if (ret != sizeof(rx_msg)) { |
| dev_err(bus->dev, "__mei_cl_recv returned %zd instead of expected %zd\n", |
| ret, sizeof(rx_msg)); |
| if (ret >= 0) |
| ret = -EIO; |
| goto end; |
| } |
| |
| /* check rx_msg.client_id and rx_msg.fence_id match the ones we send */ |
| if (rx_msg.client_id != client_id || rx_msg.fence_id != fence_id) { |
| dev_err(bus->dev, "received client_id/fence_id %u/%u instead of %u/%u sent\n", |
| rx_msg.client_id, rx_msg.fence_id, client_id, fence_id); |
| ret = -EFAULT; |
| goto end; |
| } |
| |
| dev_dbg(bus->dev, "gsc command: successfully written %u bytes\n", rx_msg.written); |
| ret = rx_msg.written; |
| |
| end: |
| kfree(ext_hdr); |
| return ret; |
| } |
| EXPORT_SYMBOL_GPL(mei_cldev_send_gsc_command); |
| |
| /** |
| * mei_cl_device_find - find matching entry in the driver id table |
| * |
| * @cldev: me client device |
| * @cldrv: me client driver |
| * |
| * Return: id on success; NULL if no id is matching |
| */ |
| static const |
| struct mei_cl_device_id *mei_cl_device_find(const struct mei_cl_device *cldev, |
| const struct mei_cl_driver *cldrv) |
| { |
| const struct mei_cl_device_id *id; |
| const uuid_le *uuid; |
| u8 version; |
| bool match; |
| |
| uuid = mei_me_cl_uuid(cldev->me_cl); |
| version = mei_me_cl_ver(cldev->me_cl); |
| |
| id = cldrv->id_table; |
| while (uuid_le_cmp(NULL_UUID_LE, id->uuid)) { |
| if (!uuid_le_cmp(*uuid, id->uuid)) { |
| match = true; |
| |
| if (cldev->name[0]) |
| if (strncmp(cldev->name, id->name, |
| sizeof(id->name))) |
| match = false; |
| |
| if (id->version != MEI_CL_VERSION_ANY) |
| if (id->version != version) |
| match = false; |
| if (match) |
| return id; |
| } |
| |
| id++; |
| } |
| |
| return NULL; |
| } |
| |
| /** |
| * mei_cl_device_match - device match function |
| * |
| * @dev: device |
| * @drv: driver |
| * |
| * Return: 1 if matching device was found 0 otherwise |
| */ |
| static int mei_cl_device_match(struct device *dev, struct device_driver *drv) |
| { |
| const struct mei_cl_device *cldev = to_mei_cl_device(dev); |
| const struct mei_cl_driver *cldrv = to_mei_cl_driver(drv); |
| const struct mei_cl_device_id *found_id; |
| |
| if (!cldev->do_match) |
| return 0; |
| |
| if (!cldrv || !cldrv->id_table) |
| return 0; |
| |
| found_id = mei_cl_device_find(cldev, cldrv); |
| if (found_id) |
| return 1; |
| |
| return 0; |
| } |
| |
| /** |
| * mei_cl_device_probe - bus probe function |
| * |
| * @dev: device |
| * |
| * Return: 0 on success; < 0 otherwise |
| */ |
| static int mei_cl_device_probe(struct device *dev) |
| { |
| struct mei_cl_device *cldev; |
| struct mei_cl_driver *cldrv; |
| const struct mei_cl_device_id *id; |
| int ret; |
| |
| cldev = to_mei_cl_device(dev); |
| cldrv = to_mei_cl_driver(dev->driver); |
| |
| if (!cldrv || !cldrv->probe) |
| return -ENODEV; |
| |
| id = mei_cl_device_find(cldev, cldrv); |
| if (!id) |
| return -ENODEV; |
| |
| if (!mei_cl_bus_module_get(cldev)) { |
| dev_err(&cldev->dev, "get hw module failed"); |
| return -ENODEV; |
| } |
| |
| ret = cldrv->probe(cldev, id); |
| if (ret) { |
| mei_cl_bus_module_put(cldev); |
| return ret; |
| } |
| |
| __module_get(THIS_MODULE); |
| return 0; |
| } |
| |
| /** |
| * mei_cl_device_remove - remove device from the bus |
| * |
| * @dev: device |
| * |
| * Return: 0 on success; < 0 otherwise |
| */ |
| static void mei_cl_device_remove(struct device *dev) |
| { |
| struct mei_cl_device *cldev = to_mei_cl_device(dev); |
| struct mei_cl_driver *cldrv = to_mei_cl_driver(dev->driver); |
| |
| if (cldrv->remove) |
| cldrv->remove(cldev); |
| |
| mei_cldev_unregister_callbacks(cldev); |
| |
| mei_cl_bus_module_put(cldev); |
| module_put(THIS_MODULE); |
| } |
| |
| static ssize_t name_show(struct device *dev, struct device_attribute *a, |
| char *buf) |
| { |
| struct mei_cl_device *cldev = to_mei_cl_device(dev); |
| |
| return scnprintf(buf, PAGE_SIZE, "%s", cldev->name); |
| } |
| static DEVICE_ATTR_RO(name); |
| |
| static ssize_t uuid_show(struct device *dev, struct device_attribute *a, |
| char *buf) |
| { |
| struct mei_cl_device *cldev = to_mei_cl_device(dev); |
| const uuid_le *uuid = mei_me_cl_uuid(cldev->me_cl); |
| |
| return sprintf(buf, "%pUl", uuid); |
| } |
| static DEVICE_ATTR_RO(uuid); |
| |
| static ssize_t version_show(struct device *dev, struct device_attribute *a, |
| char *buf) |
| { |
| struct mei_cl_device *cldev = to_mei_cl_device(dev); |
| u8 version = mei_me_cl_ver(cldev->me_cl); |
| |
| return sprintf(buf, "%02X", version); |
| } |
| static DEVICE_ATTR_RO(version); |
| |
| static ssize_t modalias_show(struct device *dev, struct device_attribute *a, |
| char *buf) |
| { |
| struct mei_cl_device *cldev = to_mei_cl_device(dev); |
| const uuid_le *uuid = mei_me_cl_uuid(cldev->me_cl); |
| u8 version = mei_me_cl_ver(cldev->me_cl); |
| |
| return scnprintf(buf, PAGE_SIZE, "mei:%s:%pUl:%02X:", |
| cldev->name, uuid, version); |
| } |
| static DEVICE_ATTR_RO(modalias); |
| |
| static ssize_t max_conn_show(struct device *dev, struct device_attribute *a, |
| char *buf) |
| { |
| struct mei_cl_device *cldev = to_mei_cl_device(dev); |
| u8 maxconn = mei_me_cl_max_conn(cldev->me_cl); |
| |
| return sprintf(buf, "%d", maxconn); |
| } |
| static DEVICE_ATTR_RO(max_conn); |
| |
| static ssize_t fixed_show(struct device *dev, struct device_attribute *a, |
| char *buf) |
| { |
| struct mei_cl_device *cldev = to_mei_cl_device(dev); |
| u8 fixed = mei_me_cl_fixed(cldev->me_cl); |
| |
| return sprintf(buf, "%d", fixed); |
| } |
| static DEVICE_ATTR_RO(fixed); |
| |
| static ssize_t vtag_show(struct device *dev, struct device_attribute *a, |
| char *buf) |
| { |
| struct mei_cl_device *cldev = to_mei_cl_device(dev); |
| bool vt = mei_me_cl_vt(cldev->me_cl); |
| |
| return sprintf(buf, "%d", vt); |
| } |
| static DEVICE_ATTR_RO(vtag); |
| |
| static ssize_t max_len_show(struct device *dev, struct device_attribute *a, |
| char *buf) |
| { |
| struct mei_cl_device *cldev = to_mei_cl_device(dev); |
| u32 maxlen = mei_me_cl_max_len(cldev->me_cl); |
| |
| return sprintf(buf, "%u", maxlen); |
| } |
| static DEVICE_ATTR_RO(max_len); |
| |
| static struct attribute *mei_cldev_attrs[] = { |
| &dev_attr_name.attr, |
| &dev_attr_uuid.attr, |
| &dev_attr_version.attr, |
| &dev_attr_modalias.attr, |
| &dev_attr_max_conn.attr, |
| &dev_attr_fixed.attr, |
| &dev_attr_vtag.attr, |
| &dev_attr_max_len.attr, |
| NULL, |
| }; |
| ATTRIBUTE_GROUPS(mei_cldev); |
| |
| /** |
| * mei_cl_device_uevent - me client bus uevent handler |
| * |
| * @dev: device |
| * @env: uevent kobject |
| * |
| * Return: 0 on success -ENOMEM on when add_uevent_var fails |
| */ |
| static int mei_cl_device_uevent(const struct device *dev, struct kobj_uevent_env *env) |
| { |
| const struct mei_cl_device *cldev = to_mei_cl_device(dev); |
| const uuid_le *uuid = mei_me_cl_uuid(cldev->me_cl); |
| u8 version = mei_me_cl_ver(cldev->me_cl); |
| |
| if (add_uevent_var(env, "MEI_CL_VERSION=%d", version)) |
| return -ENOMEM; |
| |
| if (add_uevent_var(env, "MEI_CL_UUID=%pUl", uuid)) |
| return -ENOMEM; |
| |
| if (add_uevent_var(env, "MEI_CL_NAME=%s", cldev->name)) |
| return -ENOMEM; |
| |
| if (add_uevent_var(env, "MODALIAS=mei:%s:%pUl:%02X:", |
| cldev->name, uuid, version)) |
| return -ENOMEM; |
| |
| return 0; |
| } |
| |
| static struct bus_type mei_cl_bus_type = { |
| .name = "mei", |
| .dev_groups = mei_cldev_groups, |
| .match = mei_cl_device_match, |
| .probe = mei_cl_device_probe, |
| .remove = mei_cl_device_remove, |
| .uevent = mei_cl_device_uevent, |
| }; |
| |
| static struct mei_device *mei_dev_bus_get(struct mei_device *bus) |
| { |
| if (bus) |
| get_device(bus->dev); |
| |
| return bus; |
| } |
| |
| static void mei_dev_bus_put(struct mei_device *bus) |
| { |
| if (bus) |
| put_device(bus->dev); |
| } |
| |
| static void mei_cl_bus_dev_release(struct device *dev) |
| { |
| struct mei_cl_device *cldev = to_mei_cl_device(dev); |
| |
| mei_cl_flush_queues(cldev->cl, NULL); |
| mei_me_cl_put(cldev->me_cl); |
| mei_dev_bus_put(cldev->bus); |
| kfree(cldev->cl); |
| kfree(cldev); |
| } |
| |
| static const struct device_type mei_cl_device_type = { |
| .release = mei_cl_bus_dev_release, |
| }; |
| |
| /** |
| * mei_cl_bus_set_name - set device name for me client device |
| * <controller>-<client device> |
| * Example: 0000:00:16.0-55213584-9a29-4916-badf-0fb7ed682aeb |
| * |
| * @cldev: me client device |
| */ |
| static inline void mei_cl_bus_set_name(struct mei_cl_device *cldev) |
| { |
| dev_set_name(&cldev->dev, "%s-%pUl", |
| dev_name(cldev->bus->dev), |
| mei_me_cl_uuid(cldev->me_cl)); |
| } |
| |
| /** |
| * mei_cl_bus_dev_alloc - initialize and allocate mei client device |
| * |
| * @bus: mei device |
| * @me_cl: me client |
| * |
| * Return: allocated device structure or NULL on allocation failure |
| */ |
| static struct mei_cl_device *mei_cl_bus_dev_alloc(struct mei_device *bus, |
| struct mei_me_client *me_cl) |
| { |
| struct mei_cl_device *cldev; |
| struct mei_cl *cl; |
| |
| cldev = kzalloc(sizeof(*cldev), GFP_KERNEL); |
| if (!cldev) |
| return NULL; |
| |
| cl = mei_cl_allocate(bus); |
| if (!cl) { |
| kfree(cldev); |
| return NULL; |
| } |
| |
| device_initialize(&cldev->dev); |
| cldev->dev.parent = bus->dev; |
| cldev->dev.bus = &mei_cl_bus_type; |
| cldev->dev.type = &mei_cl_device_type; |
| cldev->bus = mei_dev_bus_get(bus); |
| cldev->me_cl = mei_me_cl_get(me_cl); |
| cldev->cl = cl; |
| mei_cl_bus_set_name(cldev); |
| cldev->is_added = 0; |
| INIT_LIST_HEAD(&cldev->bus_list); |
| device_enable_async_suspend(&cldev->dev); |
| |
| return cldev; |
| } |
| |
| /** |
| * mei_cl_bus_dev_setup - setup me client device |
| * run fix up routines and set the device name |
| * |
| * @bus: mei device |
| * @cldev: me client device |
| * |
| * Return: true if the device is eligible for enumeration |
| */ |
| static bool mei_cl_bus_dev_setup(struct mei_device *bus, |
| struct mei_cl_device *cldev) |
| { |
| cldev->do_match = 1; |
| mei_cl_bus_dev_fixup(cldev); |
| |
| /* the device name can change during fix up */ |
| if (cldev->do_match) |
| mei_cl_bus_set_name(cldev); |
| |
| return cldev->do_match == 1; |
| } |
| |
| /** |
| * mei_cl_bus_dev_add - add me client devices |
| * |
| * @cldev: me client device |
| * |
| * Return: 0 on success; < 0 on failure |
| */ |
| static int mei_cl_bus_dev_add(struct mei_cl_device *cldev) |
| { |
| int ret; |
| |
| dev_dbg(cldev->bus->dev, "adding %pUL:%02X\n", |
| mei_me_cl_uuid(cldev->me_cl), |
| mei_me_cl_ver(cldev->me_cl)); |
| ret = device_add(&cldev->dev); |
| if (!ret) |
| cldev->is_added = 1; |
| |
| return ret; |
| } |
| |
| /** |
| * mei_cl_bus_dev_stop - stop the driver |
| * |
| * @cldev: me client device |
| */ |
| static void mei_cl_bus_dev_stop(struct mei_cl_device *cldev) |
| { |
| cldev->do_match = 0; |
| if (cldev->is_added) |
| device_release_driver(&cldev->dev); |
| } |
| |
| /** |
| * mei_cl_bus_dev_destroy - destroy me client devices object |
| * |
| * @cldev: me client device |
| * |
| * Locking: called under "dev->cl_bus_lock" lock |
| */ |
| static void mei_cl_bus_dev_destroy(struct mei_cl_device *cldev) |
| { |
| |
| WARN_ON(!mutex_is_locked(&cldev->bus->cl_bus_lock)); |
| |
| if (!cldev->is_added) |
| return; |
| |
| device_del(&cldev->dev); |
| |
| list_del_init(&cldev->bus_list); |
| |
| cldev->is_added = 0; |
| put_device(&cldev->dev); |
| } |
| |
| /** |
| * mei_cl_bus_remove_device - remove a devices form the bus |
| * |
| * @cldev: me client device |
| */ |
| static void mei_cl_bus_remove_device(struct mei_cl_device *cldev) |
| { |
| mei_cl_bus_dev_stop(cldev); |
| mei_cl_bus_dev_destroy(cldev); |
| } |
| |
| /** |
| * mei_cl_bus_remove_devices - remove all devices form the bus |
| * |
| * @bus: mei device |
| */ |
| void mei_cl_bus_remove_devices(struct mei_device *bus) |
| { |
| struct mei_cl_device *cldev, *next; |
| |
| mutex_lock(&bus->cl_bus_lock); |
| list_for_each_entry_safe(cldev, next, &bus->device_list, bus_list) |
| mei_cl_bus_remove_device(cldev); |
| mutex_unlock(&bus->cl_bus_lock); |
| } |
| |
| |
| /** |
| * mei_cl_bus_dev_init - allocate and initializes an mei client devices |
| * based on me client |
| * |
| * @bus: mei device |
| * @me_cl: me client |
| * |
| * Locking: called under "dev->cl_bus_lock" lock |
| */ |
| static void mei_cl_bus_dev_init(struct mei_device *bus, |
| struct mei_me_client *me_cl) |
| { |
| struct mei_cl_device *cldev; |
| |
| WARN_ON(!mutex_is_locked(&bus->cl_bus_lock)); |
| |
| dev_dbg(bus->dev, "initializing %pUl", mei_me_cl_uuid(me_cl)); |
| |
| if (me_cl->bus_added) |
| return; |
| |
| cldev = mei_cl_bus_dev_alloc(bus, me_cl); |
| if (!cldev) |
| return; |
| |
| me_cl->bus_added = true; |
| list_add_tail(&cldev->bus_list, &bus->device_list); |
| |
| } |
| |
| /** |
| * mei_cl_bus_rescan - scan me clients list and add create |
| * devices for eligible clients |
| * |
| * @bus: mei device |
| */ |
| static void mei_cl_bus_rescan(struct mei_device *bus) |
| { |
| struct mei_cl_device *cldev, *n; |
| struct mei_me_client *me_cl; |
| |
| mutex_lock(&bus->cl_bus_lock); |
| |
| down_read(&bus->me_clients_rwsem); |
| list_for_each_entry(me_cl, &bus->me_clients, list) |
| mei_cl_bus_dev_init(bus, me_cl); |
| up_read(&bus->me_clients_rwsem); |
| |
| list_for_each_entry_safe(cldev, n, &bus->device_list, bus_list) { |
| |
| if (!mei_me_cl_is_active(cldev->me_cl)) { |
| mei_cl_bus_remove_device(cldev); |
| continue; |
| } |
| |
| if (cldev->is_added) |
| continue; |
| |
| if (mei_cl_bus_dev_setup(bus, cldev)) |
| mei_cl_bus_dev_add(cldev); |
| else { |
| list_del_init(&cldev->bus_list); |
| put_device(&cldev->dev); |
| } |
| } |
| mutex_unlock(&bus->cl_bus_lock); |
| |
| dev_dbg(bus->dev, "rescan end"); |
| } |
| |
| void mei_cl_bus_rescan_work(struct work_struct *work) |
| { |
| struct mei_device *bus = |
| container_of(work, struct mei_device, bus_rescan_work); |
| |
| mei_cl_bus_rescan(bus); |
| } |
| |
| int __mei_cldev_driver_register(struct mei_cl_driver *cldrv, |
| struct module *owner) |
| { |
| int err; |
| |
| cldrv->driver.name = cldrv->name; |
| cldrv->driver.owner = owner; |
| cldrv->driver.bus = &mei_cl_bus_type; |
| |
| err = driver_register(&cldrv->driver); |
| if (err) |
| return err; |
| |
| pr_debug("mei: driver [%s] registered\n", cldrv->driver.name); |
| |
| return 0; |
| } |
| EXPORT_SYMBOL_GPL(__mei_cldev_driver_register); |
| |
| void mei_cldev_driver_unregister(struct mei_cl_driver *cldrv) |
| { |
| driver_unregister(&cldrv->driver); |
| |
| pr_debug("mei: driver [%s] unregistered\n", cldrv->driver.name); |
| } |
| EXPORT_SYMBOL_GPL(mei_cldev_driver_unregister); |
| |
| |
| int __init mei_cl_bus_init(void) |
| { |
| return bus_register(&mei_cl_bus_type); |
| } |
| |
| void __exit mei_cl_bus_exit(void) |
| { |
| bus_unregister(&mei_cl_bus_type); |
| } |