linux/drivers/accel/qaic/qaic_drv.c
Jeffrey Hugo 50e9cc9a4a Revert "accel/qaic: Add mhi_qaic_cntl"
This reverts commit 566fc96198.

This exposes a userspace API that is still under debate.  Revert the
change before the uAPI gets exposed to avoid making a mistake.  QAIC is
otherwise still functional.

Suggested-by: Daniel Vetter <daniel@ffwll.ch>
Signed-off-by: Jeffrey Hugo <quic_jhugo@quicinc.com>
Reviewed-by: Pranjal Ramajor Asha Kanojiya <quic_pkanojiy@quicinc.com>
Reviewed-by: Stanislaw Gruszka <stanislaw.gruszka@linux.intel.com>
Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Jacek Lawrynowicz <jacek.lawrynowicz@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/1681307864-3782-1-git-send-email-quic_jhugo@quicinc.com
2023-04-13 12:08:08 +02:00

638 lines
16 KiB
C

// 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 "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
bool datapath_polling;
module_param(datapath_polling, bool, 0400);
MODULE_PARM_DESC(datapath_polling, "Operate the datapath in polling mode");
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) {
ret = -ENODEV;
goto dev_unlock;
}
usr = kmalloc(sizeof(*usr), GFP_KERNEL);
if (!usr) {
ret = -ENOMEM;
goto dev_unlock;
}
usr->handle = ida_alloc(&qaic_usrs, GFP_KERNEL);
if (usr->handle < 0) {
ret = usr->handle;
goto free_usr;
}
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)
goto cleanup_usr;
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;
cleanup_usr:
cleanup_srcu_struct(&usr->qddev_lock);
free_usr:
kfree(usr);
dev_unlock:
srcu_read_unlock(&qdev->dev_lock, rcu_id);
return ret;
}
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, 0),
DRM_IOCTL_DEF_DRV(QAIC_CREATE_BO, qaic_create_bo_ioctl, 0),
DRM_IOCTL_DEF_DRV(QAIC_MMAP_BO, qaic_mmap_bo_ioctl, 0),
DRM_IOCTL_DEF_DRV(QAIC_ATTACH_SLICE_BO, qaic_attach_slice_bo_ioctl, 0),
DRM_IOCTL_DEF_DRV(QAIC_EXECUTE_BO, qaic_execute_bo_ioctl, 0),
DRM_IOCTL_DEF_DRV(QAIC_PARTIAL_EXECUTE_BO, qaic_partial_execute_bo_ioctl, 0),
DRM_IOCTL_DEF_DRV(QAIC_WAIT_BO, qaic_wait_bo_ioctl, 0),
DRM_IOCTL_DEF_DRV(QAIC_PERF_STATS_BO, qaic_perf_stats_bo_ioctl, 0),
};
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 */
}
static void qaic_notify_reset(struct qaic_device *qdev)
{
int i;
qdev->in_reset = true;
/* wake up any waiters to avoid waiting for timeouts at sync */
wake_all_cntl(qdev);
for (i = 0; i < qdev->num_dbc; ++i)
wakeup_dbc(qdev, i);
synchronize_srcu(&qdev->dev_lock);
}
void qaic_dev_reset_clean_local_state(struct qaic_device *qdev, bool exit_reset)
{
int i;
qaic_notify_reset(qdev);
/* remove drmdevs to prevent new users from coming in */
qaic_destroy_drm_device(qdev, QAIC_NO_PARTITION);
/* start tearing things down */
for (i = 0; i < qdev->num_dbc; ++i)
release_dbc(qdev, i);
if (exit_reset)
qdev->in_reset = false;
}
static struct qaic_device *create_qdev(struct pci_dev *pdev, const struct pci_device_id *id)
{
struct qaic_device *qdev;
int i;
qdev = devm_kzalloc(&pdev->dev, sizeof(*qdev), GFP_KERNEL);
if (!qdev)
return NULL;
if (id->device == PCI_DEV_AIC100) {
qdev->num_dbc = 16;
qdev->dbc = devm_kcalloc(&pdev->dev, qdev->num_dbc, sizeof(*qdev->dbc), GFP_KERNEL);
if (!qdev->dbc)
return NULL;
}
qdev->cntl_wq = alloc_workqueue("qaic_cntl", WQ_UNBOUND, 0);
if (!qdev->cntl_wq)
return NULL;
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);
for (i = 0; i < qdev->num_dbc; ++i) {
spin_lock_init(&qdev->dbc[i].xfer_lock);
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);
INIT_LIST_HEAD(&qdev->dbc[i].bo_lists);
}
return qdev;
}
static void cleanup_qdev(struct qaic_device *qdev)
{
int i;
for (i = 0; i < qdev->num_dbc; ++i)
cleanup_srcu_struct(&qdev->dbc[i].ch_lock);
cleanup_srcu_struct(&qdev->dev_lock);
pci_set_drvdata(qdev->pdev, NULL);
destroy_workqueue(qdev->cntl_wq);
}
static int init_pci(struct qaic_device *qdev, struct pci_dev *pdev)
{
int bars;
int ret;
bars = pci_select_bars(pdev, IORESOURCE_MEM);
/* make sure the device has the expected BARs */
if (bars != (BIT(0) | BIT(2) | BIT(4))) {
pci_dbg(pdev, "%s: expected BARs 0, 2, and 4 not found in device. Found 0x%x\n",
__func__, bars);
return -EINVAL;
}
ret = pcim_enable_device(pdev);
if (ret)
return ret;
ret = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(64));
if (ret)
return ret;
ret = dma_set_max_seg_size(&pdev->dev, UINT_MAX);
if (ret)
return ret;
qdev->bar_0 = devm_ioremap_resource(&pdev->dev, &pdev->resource[0]);
if (IS_ERR(qdev->bar_0))
return PTR_ERR(qdev->bar_0);
qdev->bar_2 = devm_ioremap_resource(&pdev->dev, &pdev->resource[2]);
if (IS_ERR(qdev->bar_2))
return PTR_ERR(qdev->bar_2);
/* Managed release since we use pcim_enable_device above */
pci_set_master(pdev);
return 0;
}
static int init_msi(struct qaic_device *qdev, struct pci_dev *pdev)
{
int mhi_irq;
int ret;
int i;
/* Managed release since we use pcim_enable_device */
ret = pci_alloc_irq_vectors(pdev, 1, 32, PCI_IRQ_MSI);
if (ret < 0)
return ret;
if (ret < 32) {
pci_err(pdev, "%s: Requested 32 MSIs. Obtained %d MSIs which is less than the 32 required.\n",
__func__, ret);
return -ENODEV;
}
mhi_irq = pci_irq_vector(pdev, 0);
if (mhi_irq < 0)
return mhi_irq;
for (i = 0; i < qdev->num_dbc; ++i) {
ret = devm_request_threaded_irq(&pdev->dev, pci_irq_vector(pdev, i + 1),
dbc_irq_handler, dbc_irq_threaded_fn, IRQF_SHARED,
"qaic_dbc", &qdev->dbc[i]);
if (ret)
return ret;
if (datapath_polling) {
qdev->dbc[i].irq = pci_irq_vector(pdev, i + 1);
disable_irq_nosync(qdev->dbc[i].irq);
INIT_WORK(&qdev->dbc[i].poll_work, irq_polling_work);
}
}
return mhi_irq;
}
static int qaic_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
{
struct qaic_device *qdev;
int mhi_irq;
int ret;
int i;
qdev = create_qdev(pdev, id);
if (!qdev)
return -ENOMEM;
ret = init_pci(qdev, pdev);
if (ret)
goto cleanup_qdev;
for (i = 0; i < qdev->num_dbc; ++i)
qdev->dbc[i].dbc_base = qdev->bar_2 + QAIC_DBC_OFF(i);
mhi_irq = init_msi(qdev, pdev);
if (mhi_irq < 0) {
ret = mhi_irq;
goto cleanup_qdev;
}
qdev->mhi_cntrl = qaic_mhi_register_controller(pdev, qdev->bar_0, mhi_irq);
if (IS_ERR(qdev->mhi_cntrl)) {
ret = PTR_ERR(qdev->mhi_cntrl);
goto cleanup_qdev;
}
return 0;
cleanup_qdev:
cleanup_qdev(qdev);
return ret;
}
static void qaic_pci_remove(struct pci_dev *pdev)
{
struct qaic_device *qdev = pci_get_drvdata(pdev);
if (!qdev)
return;
qaic_dev_reset_clean_local_state(qdev, false);
qaic_mhi_free_controller(qdev->mhi_cntrl, link_up);
cleanup_qdev(qdev);
}
static void qaic_pci_shutdown(struct pci_dev *pdev)
{
/* see qaic_exit for what link_up is doing */
link_up = true;
qaic_pci_remove(pdev);
}
static pci_ers_result_t qaic_pci_error_detected(struct pci_dev *pdev, pci_channel_state_t error)
{
return PCI_ERS_RESULT_NEED_RESET;
}
static void qaic_pci_reset_prepare(struct pci_dev *pdev)
{
struct qaic_device *qdev = pci_get_drvdata(pdev);
qaic_notify_reset(qdev);
qaic_mhi_start_reset(qdev->mhi_cntrl);
qaic_dev_reset_clean_local_state(qdev, false);
}
static void qaic_pci_reset_done(struct pci_dev *pdev)
{
struct qaic_device *qdev = pci_get_drvdata(pdev);
qdev->in_reset = false;
qaic_mhi_reset_done(qdev->mhi_cntrl);
}
static const struct mhi_device_id qaic_mhi_match_table[] = {
{ .chan = "QAIC_CONTROL", },
{},
};
static struct mhi_driver qaic_mhi_driver = {
.id_table = qaic_mhi_match_table,
.remove = qaic_mhi_remove,
.probe = qaic_mhi_probe,
.ul_xfer_cb = qaic_mhi_ul_xfer_cb,
.dl_xfer_cb = qaic_mhi_dl_xfer_cb,
.driver = {
.name = "qaic_mhi",
},
};
static const struct pci_device_id qaic_ids[] = {
{ PCI_DEVICE(PCI_VENDOR_ID_QCOM, PCI_DEV_AIC100), },
{ }
};
MODULE_DEVICE_TABLE(pci, qaic_ids);
static const struct pci_error_handlers qaic_pci_err_handler = {
.error_detected = qaic_pci_error_detected,
.reset_prepare = qaic_pci_reset_prepare,
.reset_done = qaic_pci_reset_done,
};
static struct pci_driver qaic_pci_driver = {
.name = QAIC_NAME,
.id_table = qaic_ids,
.probe = qaic_pci_probe,
.remove = qaic_pci_remove,
.shutdown = qaic_pci_shutdown,
.err_handler = &qaic_pci_err_handler,
};
static int __init qaic_init(void)
{
int ret;
ret = mhi_driver_register(&qaic_mhi_driver);
if (ret) {
pr_debug("qaic: mhi_driver_register failed %d\n", ret);
return ret;
}
ret = pci_register_driver(&qaic_pci_driver);
if (ret) {
pr_debug("qaic: pci_register_driver failed %d\n", ret);
goto free_mhi;
}
return 0;
free_mhi:
mhi_driver_unregister(&qaic_mhi_driver);
return ret;
}
static void __exit qaic_exit(void)
{
/*
* We assume that qaic_pci_remove() is called due to a hotplug event
* which would mean that the link is down, and thus
* qaic_mhi_free_controller() should not try to access the device during
* cleanup.
* We call pci_unregister_driver() below, which also triggers
* qaic_pci_remove(), but since this is module exit, we expect the link
* to the device to be up, in which case qaic_mhi_free_controller()
* should try to access the device during cleanup to put the device in
* a sane state.
* For that reason, we set link_up here to let qaic_mhi_free_controller
* know the expected link state. Since the module is going to be
* removed at the end of this, we don't need to worry about
* reinitializing the link_up state after the cleanup is done.
*/
link_up = true;
pci_unregister_driver(&qaic_pci_driver);
mhi_driver_unregister(&qaic_mhi_driver);
}
module_init(qaic_init);
module_exit(qaic_exit);
MODULE_AUTHOR(QAIC_DESC " Kernel Driver Team");
MODULE_DESCRIPTION(QAIC_DESC " Accel Driver");
MODULE_LICENSE("GPL");