Hi,
On 06.03.2023 22:33, Jeffrey Hugo wrote:
> Add the QAIC driver uapi file and core driver file that binds to the PCIe
> device. The core driver file also creates the accel device and manages
> all the interconnections between the different parts of the driver.
>
> The driver can be built as a module. If so, it will be called "qaic.ko".
>
> Signed-off-by: Jeffrey Hugo <quic_jh...@quicinc.com>
> Reviewed-by: Carl Vanderlip <quic_ca...@quicinc.com>
> Reviewed-by: Pranjal Ramajor Asha Kanojiya <quic_pkano...@quicinc.com>
> ---
> drivers/accel/qaic/qaic.h | 282 ++++++++++++++++++
> drivers/accel/qaic/qaic_drv.c | 648
> ++++++++++++++++++++++++++++++++++++++++++
> include/uapi/drm/qaic_accel.h | 397 ++++++++++++++++++++++++++
> 3 files changed, 1327 insertions(+)
> create mode 100644 drivers/accel/qaic/qaic.h
> create mode 100644 drivers/accel/qaic/qaic_drv.c
> create mode 100644 include/uapi/drm/qaic_accel.h
>
> diff --git a/drivers/accel/qaic/qaic.h b/drivers/accel/qaic/qaic.h
> new file mode 100644
> index 0000000..996a68f
> --- /dev/null
> +++ b/drivers/accel/qaic/qaic.h
> @@ -0,0 +1,282 @@
> +/* SPDX-License-Identifier: GPL-2.0-only
> + *
> + * Copyright (c) 2019-2021, The Linux Foundation. All rights reserved.
> + * Copyright (c) 2021-2023 Qualcomm Innovation Center, Inc. All rights
> reserved.
> + */
> +
> +#ifndef _QAIC_H_
> +#define _QAIC_H_
> +
> +#include <linux/interrupt.h>
> +#include <linux/kref.h>
> +#include <linux/mhi.h>
> +#include <linux/mutex.h>
> +#include <linux/pci.h>
> +#include <linux/spinlock.h>
> +#include <linux/srcu.h>
> +#include <linux/wait.h>
> +#include <linux/workqueue.h>
> +#include <drm/drm_device.h>
> +#include <drm/drm_gem.h>
> +
> +#define QAIC_DBC_BASE SZ_128K
> +#define QAIC_DBC_SIZE SZ_4K
> +
> +#define QAIC_NO_PARTITION -1
> +
> +#define QAIC_DBC_OFF(i) ((i) * QAIC_DBC_SIZE + QAIC_DBC_BASE)
> +
> +#define to_qaic_bo(obj) container_of(obj, struct qaic_bo, base)
> +
> +extern bool poll_datapath;
> +
> +struct qaic_user {
> + /* Uniquely identifies this user for the device */
> + int handle;
> + struct kref ref_count;
> + /* Char device opened by this user */
> + struct qaic_drm_device *qddev;
> + /* Node in list of users that opened this drm device */
> + struct list_head node;
> + /* SRCU used to synchronize this user during cleanup */
> + struct srcu_struct qddev_lock;
> + atomic_t chunk_id;
> +};
> +
> +struct dma_bridge_chan {
> + /* Pointer to device strcut maintained by driver */
> + struct qaic_device *qdev;
> + /* ID of this DMA bridge channel(DBC) */
> + unsigned int id;
> + /* Synchronizes access to xfer_list */
> + spinlock_t xfer_lock;
> + /* Base address of request queue */
> + void *req_q_base;
> + /* Base address of response queue */
> + void *rsp_q_base;
> + /*
> + * Base bus address of request queue. Response queue bus address can be
> + * calculated by adding request queue size to this variable
> + */
> + dma_addr_t dma_addr;
> + /* Total size of request and response queue in byte */
> + u32 total_size;
> + /* Capacity of request/response queue */
> + u32 nelem;
> + /* The user that opened this DBC */
> + struct qaic_user *usr;
> + /*
> + * Request ID of next memory handle that goes in request queue. One
> + * memory handle can enqueue more than one request elements, all
> + * this requests that belong to same memory handle have same request ID
> + */
> + u16 next_req_id;
> + /* true: DBC is in use; false: DBC not in use */
> + bool in_use;
> + /*
> + * Base address of device registers. Used to read/write request and
> + * response queue's head and tail pointer of this DBC.
> + */
> + void __iomem *dbc_base;
> + /* Head of list where each node is a memory handle queued in request
> queue */
> + struct list_head xfer_list;
> + /* Synchronizes DBC readers during cleanup */
> + struct srcu_struct ch_lock;
> + /*
> + * When this DBC is released, any thread waiting on this wait queue is
> + * woken up
> + */
> + wait_queue_head_t dbc_release;
> + /* Head of list where each node is a bo associated with this DBC */
> + struct list_head bo_lists;
> + /* The irq line for this DBC. Used for polling */
> + unsigned int irq;
> + /* Polling work item to simulate interrupts */
> + struct work_struct poll_work;
> +};
> +
> +struct qaic_device {
> + /* Pointer to base PCI device struct of our physical device */
> + struct pci_dev *pdev;
> + /* Req. ID of request that will be queued next in MHI control device */
> + u32 next_seq_num;
> + /* Base address of bar 0 */
> + void __iomem *bar_0;
> + /* Base address of bar 2 */
> + void __iomem *bar_2;
> + /* Controller structure for MHI devices */
> + struct mhi_controller *mhi_cntl;
> + /* MHI control channel device */
> + struct mhi_device *cntl_ch;
> + /* List of requests queued in MHI control device */
> + struct list_head cntl_xfer_list;
> + /* Synchronizes MHI control device transactions and its xfer list */
> + struct mutex cntl_mutex;
> + /* Array of DBC struct of this device */
> + struct dma_bridge_chan *dbc;
> + /* Work queue for tasks related to MHI control device */
> + struct workqueue_struct *cntl_wq;
> + /* Synchronizes all the users of device during cleanup */
> + struct srcu_struct dev_lock;
> + /* true: Device under reset; false: Device not under reset */
> + bool in_reset;
> + /*
> + * true: A tx MHI transaction has failed and a rx buffer is still queued
> + * in control device. Such a buffer is considered lost rx buffer
> + * false: No rx buffer is lost in control device
> + */
> + bool cntl_lost_buf;
> + /* Maximum number of DBC supported by this device */
> + u32 num_dbc;
> + /* Reference to the drm_device for this device when it is created */
> + struct qaic_drm_device *qddev;
> + /* Generate the CRC of a control message */
> + u32 (*gen_crc)(void *msg);
> + /* Validate the CRC of a control message */
> + bool (*valid_crc)(void *msg);
> +};
> +
> +struct qaic_drm_device {
> + /* Pointer to the root device struct driven by this driver */
> + struct qaic_device *qdev;
> + /*
> + * The physical device can be partition in number of logical devices.
> + * And each logical device is given a partition id. This member stores
> + * that id. QAIC_NO_PARTITION is a sentinel used to mark that this drm
> + * device is the actual physical device
> + */
> + s32 partition_id;
> + /* Pointer to the drm device struct of this drm device */
> + struct drm_device *ddev;
> + /* Head in list of users who have opened this drm device */
> + struct list_head users;
> + /* Synchronizes access to users list */
> + struct mutex users_mutex;
> +};
> +
> +struct qaic_bo {
> + struct drm_gem_object base;
> + /* Scatter/gather table for allocate/imported BO */
> + struct sg_table *sgt;
> + /* BO size requested by user. GEM object might be bigger in size. */
> + u64 size;
> + /* Head in list of slices of this BO */
> + struct list_head slices;
> + /* Total nents, for all slices of this BO */
> + int total_slice_nents;
> + /*
> + * Direction of transfer. It can assume only two value DMA_TO_DEVICE and
> + * DMA_FROM_DEVICE.
> + */
> + int dir;
> + /* The pointer of the DBC which operates on this BO */
> + struct dma_bridge_chan *dbc;
> + /* Number of slice that belongs to this buffer */
> + u32 nr_slice;
> + /* Number of slice that have been transferred by DMA engine */
> + u32 nr_slice_xfer_done;
> + /* true = BO is queued for execution, true = BO is not queued */
> + bool queued;
> + /*
> + * If true then user has attached slicing information to this BO by
> + * calling DRM_IOCTL_QAIC_ATTACH_SLICE_BO ioctl.
> + */
> + bool sliced;
> + /* Request ID of this BO if it is queued for execution */
> + u16 req_id;
> + /* Handle assigned to this BO */
> + u32 handle;
> + /* Wait on this for completion of DMA transfer of this BO */
> + struct completion xfer_done;
> + /*
> + * Node in linked list where head is dbc->xfer_list.
> + * This link list contain BO's that are queued for DMA transfer.
> + */
> + struct list_head xfer_list;
> + /*
> + * Node in linked list where head is dbc->bo_lists.
> + * This link list contain BO's that are associated with the DBC it is
> + * linked to.
> + */
> + struct list_head bo_list;
> + struct {
> + /*
> + * Latest timestamp(ns) at which kernel received a request to
> + * execute this BO
> + */
> + u64 req_received_ts;
> + /*
> + * Latest timestamp(ns) at which kernel enqueued requests of
> + * this BO for execution in DMA queue
> + */
> + u64 req_submit_ts;
> + /*
> + * Latest timestamp(ns) at which kernel received a completion
> + * interrupt for requests of this BO
> + */
> + u64 req_processed_ts;
> + /*
> + * Number of elements already enqueued in DMA queue before
> + * enqueuing requests of this BO
> + */
> + u32 queue_level_before;
> + } perf_stats;
> +
> +};
> +
> +struct bo_slice {
> + /* Mapped pages */
> + struct sg_table *sgt;
> + /* Number of requests required to queue in DMA queue */
> + int nents;
> + /* See enum dma_data_direction */
> + int dir;
> + /* Actual requests that will be copied in DMA queue */
> + struct dbc_req *reqs;
> + struct kref ref_count;
> + /* true: No DMA transfer required */
> + bool no_xfer;
> + /* Pointer to the parent BO handle */
> + struct qaic_bo *bo;
> + /* Node in list of slices maintained by parent BO */
> + struct list_head slice;
> + /* Size of this slice in bytes */
> + u64 size;
> + /* Offset of this slice in buffer */
> + u64 offset;
> +};
> +
> +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 drm_device *dev, void *data, struct drm_file
> *file_priv);
> +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);
> +
> +irqreturn_t dbc_irq_threaded_fn(int irq, void *data);
> +irqreturn_t dbc_irq_handler(int irq, void *data);
> +int disable_dbc(struct qaic_device *qdev, u32 dbc_id, struct qaic_user *usr);
> +void enable_dbc(struct qaic_device *qdev, u32 dbc_id, struct qaic_user *usr);
> +void wakeup_dbc(struct qaic_device *qdev, u32 dbc_id);
> +void release_dbc(struct qaic_device *qdev, u32 dbc_id);
> +
> +void wake_all_cntl(struct qaic_device *qdev);
> +void qaic_dev_reset_clean_local_state(struct qaic_device *qdev, bool
> exit_reset);
> +
> +struct drm_gem_object *qaic_gem_prime_import(struct drm_device *dev, struct
> dma_buf *dma_buf);
> +
> +int qaic_create_bo_ioctl(struct drm_device *dev, void *data, struct drm_file
> *file_priv);
> +int qaic_mmap_bo_ioctl(struct drm_device *dev, void *data, struct drm_file
> *file_priv);
> +int qaic_attach_slice_bo_ioctl(struct drm_device *dev, void *data, struct
> drm_file *file_priv);
> +int qaic_execute_bo_ioctl(struct drm_device *dev, void *data, struct
> drm_file *file_priv);
> +int qaic_partial_execute_bo_ioctl(struct drm_device *dev, void *data, struct
> drm_file *file_priv);
> +int qaic_wait_bo_ioctl(struct drm_device *dev, void *data, struct drm_file
> *file_priv);
> +int qaic_perf_stats_bo_ioctl(struct drm_device *dev, void *data, struct
> drm_file *file_priv);
> +void irq_polling_work(struct work_struct *work);
> +
> +#endif /* _QAIC_H_ */
> diff --git a/drivers/accel/qaic/qaic_drv.c b/drivers/accel/qaic/qaic_drv.c
> new file mode 100644
> index 0000000..9172799
> --- /dev/null
> +++ b/drivers/accel/qaic/qaic_drv.c
> @@ -0,0 +1,648 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +
> +/* Copyright (c) 2019-2021, The Linux Foundation. All rights reserved. */
> +/* Copyright (c) 2021-2023 Qualcomm Innovation Center, Inc. All rights
> reserved. */
> +
> +#include <linux/delay.h>
> +#include <linux/dma-mapping.h>
> +#include <linux/idr.h>
> +#include <linux/interrupt.h>
> +#include <linux/list.h>
> +#include <linux/kref.h>
> +#include <linux/mhi.h>
> +#include <linux/module.h>
> +#include <linux/msi.h>
> +#include <linux/mutex.h>
> +#include <linux/pci.h>
> +#include <linux/spinlock.h>
> +#include <linux/workqueue.h>
> +#include <linux/wait.h>
> +#include <drm/drm_accel.h>
> +#include <drm/drm_drv.h>
> +#include <drm/drm_file.h>
> +#include <drm/drm_gem.h>
> +#include <drm/drm_ioctl.h>
> +#include <uapi/drm/qaic_accel.h>
> +
> +#include "mhi_controller.h"
> +#include "mhi_qaic_ctrl.h"
> +#include "qaic.h"
> +
> +MODULE_IMPORT_NS(DMA_BUF);
> +
> +#define PCI_DEV_AIC100 0xa100
> +#define QAIC_NAME "qaic"
> +#define QAIC_DESC "Qualcomm Cloud AI Accelerators"
> +#define CNTL_MAJOR 5
> +#define CNTL_MINOR 0
> +
> +static unsigned int datapath_polling;
> +module_param(datapath_polling, uint, 0400);
> +bool poll_datapath;
You can define this param as:
static bool poll_datapath;
module_param_named(poll_datapath, datapath_polling, bool, 0400);
You woudn't have to set poll_datapath manually.
I would also consider using a single name for the param and adding
documentation using MODULE_PARM_DESC().
> +static bool link_up;
> +static DEFINE_IDA(qaic_usrs);
> +
> +static int qaic_create_drm_device(struct qaic_device *qdev, s32
> partition_id);
> +static void qaic_destroy_drm_device(struct qaic_device *qdev, s32
> partition_id);
> +
> +static void free_usr(struct kref *kref)
> +{
> + struct qaic_user *usr = container_of(kref, struct qaic_user, ref_count);
> +
> + cleanup_srcu_struct(&usr->qddev_lock);
> + ida_free(&qaic_usrs, usr->handle);
> + kfree(usr);
> +}
> +
> +static int qaic_open(struct drm_device *dev, struct drm_file *file)
> +{
> + struct qaic_drm_device *qddev = dev->dev_private;
> + struct qaic_device *qdev = qddev->qdev;
> + struct qaic_user *usr;
> + int rcu_id;
> + int ret;
> +
> + rcu_id = srcu_read_lock(&qdev->dev_lock);
> + if (qdev->in_reset) {
> + srcu_read_unlock(&qdev->dev_lock, rcu_id);
> + return -ENODEV;
> + }
> +
> + usr = kmalloc(sizeof(*usr), GFP_KERNEL);
> + if (!usr) {
> + srcu_read_unlock(&qdev->dev_lock, rcu_id);
> + return -ENOMEM;
> + }
> +
> + usr->handle = ida_alloc(&qaic_usrs, GFP_KERNEL);
> + if (usr->handle < 0) {
> + ret = usr->handle;
> + srcu_read_unlock(&qdev->dev_lock, rcu_id);
> + kfree(usr);
> + return ret;
> + }
> + usr->qddev = qddev;
> + atomic_set(&usr->chunk_id, 0);
> + init_srcu_struct(&usr->qddev_lock);
> + kref_init(&usr->ref_count);
> +
> + ret = mutex_lock_interruptible(&qddev->users_mutex);
> + if (ret) {
> + cleanup_srcu_struct(&usr->qddev_lock);
> + kfree(usr);
> + srcu_read_unlock(&qdev->dev_lock, rcu_id);
It looks like you are leaking usr->handle here.
Also the order of kfree() and srcu_read_unlock() is not consistent with other
error cases above.
I would suggest using goto to handle errors in this function.
> + return ret;
> + }
> +
> + list_add(&usr->node, &qddev->users);
> + mutex_unlock(&qddev->users_mutex);
> +
> + file->driver_priv = usr;
> +
> + srcu_read_unlock(&qdev->dev_lock, rcu_id);
> + return 0;
> +}
> +
> +static void qaic_postclose(struct drm_device *dev, struct drm_file *file)
> +{
> + struct qaic_user *usr = file->driver_priv;
> + struct qaic_drm_device *qddev;
> + struct qaic_device *qdev;
> + int qdev_rcu_id;
> + int usr_rcu_id;
> + int i;
> +
> + qddev = usr->qddev;
> + usr_rcu_id = srcu_read_lock(&usr->qddev_lock);
> + if (qddev) {
> + qdev = qddev->qdev;
> + qdev_rcu_id = srcu_read_lock(&qdev->dev_lock);
> + if (!qdev->in_reset) {
> + qaic_release_usr(qdev, usr);
> + for (i = 0; i < qdev->num_dbc; ++i)
> + if (qdev->dbc[i].usr &&
> qdev->dbc[i].usr->handle == usr->handle)
> + release_dbc(qdev, i);
> + }
> + srcu_read_unlock(&qdev->dev_lock, qdev_rcu_id);
> +
> + mutex_lock(&qddev->users_mutex);
> + if (!list_empty(&usr->node))
> + list_del_init(&usr->node);
> + mutex_unlock(&qddev->users_mutex);
> + }
> +
> + srcu_read_unlock(&usr->qddev_lock, usr_rcu_id);
> + kref_put(&usr->ref_count, free_usr);
> +
> + file->driver_priv = NULL;
> +}
> +
> +DEFINE_DRM_ACCEL_FOPS(qaic_accel_fops);
> +
> +static const struct drm_ioctl_desc qaic_drm_ioctls[] = {
> + DRM_IOCTL_DEF_DRV(QAIC_MANAGE, qaic_manage_ioctl, DRM_RENDER_ALLOW),
> + DRM_IOCTL_DEF_DRV(QAIC_CREATE_BO, qaic_create_bo_ioctl,
> DRM_RENDER_ALLOW),
> + DRM_IOCTL_DEF_DRV(QAIC_MMAP_BO, qaic_mmap_bo_ioctl, DRM_RENDER_ALLOW),
> + DRM_IOCTL_DEF_DRV(QAIC_ATTACH_SLICE_BO, qaic_attach_slice_bo_ioctl,
> DRM_RENDER_ALLOW),
> + DRM_IOCTL_DEF_DRV(QAIC_EXECUTE_BO, qaic_execute_bo_ioctl,
> DRM_RENDER_ALLOW),
> + DRM_IOCTL_DEF_DRV(QAIC_PARTIAL_EXECUTE_BO,
> qaic_partial_execute_bo_ioctl, DRM_RENDER_ALLOW),
> + DRM_IOCTL_DEF_DRV(QAIC_WAIT_BO, qaic_wait_bo_ioctl, DRM_RENDER_ALLOW),
> + DRM_IOCTL_DEF_DRV(QAIC_PERF_STATS_BO, qaic_perf_stats_bo_ioctl,
> DRM_RENDER_ALLOW),
> +};
> +
> +static const struct drm_driver qaic_accel_driver = {
> + .driver_features = DRIVER_GEM | DRIVER_COMPUTE_ACCEL,
> +
> + .name = QAIC_NAME,
> + .desc = QAIC_DESC,
> + .date = "20190618",
> +
> + .fops = &qaic_accel_fops,
> + .open = qaic_open,
> + .postclose = qaic_postclose,
> +
> + .ioctls = qaic_drm_ioctls,
> + .num_ioctls = ARRAY_SIZE(qaic_drm_ioctls),
> + .prime_fd_to_handle = drm_gem_prime_fd_to_handle,
> + .gem_prime_import = qaic_gem_prime_import,
> +};
> +
> +static int qaic_create_drm_device(struct qaic_device *qdev, s32 partition_id)
> +{
> + struct qaic_drm_device *qddev;
> + struct drm_device *ddev;
> + struct device *pdev;
> + int ret;
> +
> + /* Hold off implementing partitions until the uapi is determined */
> + if (partition_id != QAIC_NO_PARTITION)
> + return -EINVAL;
> +
> + pdev = &qdev->pdev->dev;
> +
> + qddev = kzalloc(sizeof(*qddev), GFP_KERNEL);
> + if (!qddev)
> + return -ENOMEM;
> +
> + ddev = drm_dev_alloc(&qaic_accel_driver, pdev);
> + if (IS_ERR(ddev)) {
> + ret = PTR_ERR(ddev);
> + goto ddev_fail;
> + }
> +
> + ddev->dev_private = qddev;
> + qddev->ddev = ddev;
> +
> + qddev->qdev = qdev;
> + qddev->partition_id = partition_id;
> + INIT_LIST_HEAD(&qddev->users);
> + mutex_init(&qddev->users_mutex);
> +
> + qdev->qddev = qddev;
> +
> + ret = drm_dev_register(ddev, 0);
> + if (ret) {
> + pci_dbg(qdev->pdev, "%s: drm_dev_register failed %d\n",
> __func__, ret);
> + goto drm_reg_fail;
> + }
> +
> + return 0;
> +
> +drm_reg_fail:
> + mutex_destroy(&qddev->users_mutex);
> + qdev->qddev = NULL;
> + drm_dev_put(ddev);
> +ddev_fail:
> + kfree(qddev);
> + return ret;
> +}
> +
> +static void qaic_destroy_drm_device(struct qaic_device *qdev, s32
> partition_id)
> +{
> + struct qaic_drm_device *qddev;
> + struct qaic_user *usr;
> +
> + qddev = qdev->qddev;
> +
> + /*
> + * Existing users get unresolvable errors till they close FDs.
> + * Need to sync carefully with users calling close(). The
> + * list of users can be modified elsewhere when the lock isn't
> + * held here, but the sync'ing the srcu with the mutex held
> + * could deadlock. Grab the mutex so that the list will be
> + * unmodified. The user we get will exist as long as the
> + * lock is held. Signal that the qcdev is going away, and
> + * grab a reference to the user so they don't go away for
> + * synchronize_srcu(). Then release the mutex to avoid
> + * deadlock and make sure the user has observed the signal.
> + * With the lock released, we cannot maintain any state of the
> + * user list.
> + */
> + mutex_lock(&qddev->users_mutex);
> + while (!list_empty(&qddev->users)) {
> + usr = list_first_entry(&qddev->users, struct qaic_user, node);
> + list_del_init(&usr->node);
> + kref_get(&usr->ref_count);
> + usr->qddev = NULL;
> + mutex_unlock(&qddev->users_mutex);
> + synchronize_srcu(&usr->qddev_lock);
> + kref_put(&usr->ref_count, free_usr);
> + mutex_lock(&qddev->users_mutex);
> + }
> + mutex_unlock(&qddev->users_mutex);
> +
> + if (qddev->ddev) {
> + drm_dev_unregister(qddev->ddev);
> + drm_dev_put(qddev->ddev);
> + }
> +
> + kfree(qddev);
> +}
> +
> +static int qaic_mhi_probe(struct mhi_device *mhi_dev, const struct
> mhi_device_id *id)
> +{
> + struct qaic_device *qdev;
> + u16 major, minor;
> + int ret;
> +
> + /*
> + * Invoking this function indicates that the control channel to the
> + * device is available. We use that as a signal to indicate that
> + * the device side firmware has booted. The device side firmware
> + * manages the device resources, so we need to communicate with it
> + * via the control channel in order to utilize the device. Therefore
> + * we wait until this signal to create the drm dev that userspace will
> + * use to control the device, because without the device side firmware,
> + * userspace can't do anything useful.
> + */
> +
> + qdev = pci_get_drvdata(to_pci_dev(mhi_dev->mhi_cntrl->cntrl_dev));
> +
> + qdev->in_reset = false;
> +
> + 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);
> + return ret;
> + }
> +
> + ret = get_cntl_version(qdev, NULL, &major, &minor);
> + if (ret || major != CNTL_MAJOR || minor > CNTL_MINOR) {
> + pci_err(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 = qaic_create_drm_device(qdev, QAIC_NO_PARTITION);
> +
> + return ret;
> +
> +close_control:
> + qaic_control_close(qdev);
> + return ret;
> +}
> +
> +static void qaic_mhi_remove(struct mhi_device *mhi_dev)
> +{
> + /* This is redundant since we have already observed the device crash *
Use tab instead of space for indent.
Regards,
Jacek
