mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-21 08:19:28 +00:00
![Dave Jiang](/assets/img/avatar_default.png)
Move all static data type for per device type to an idxd_driver_data data structure. The data can be attached to the pci_device_id and provided by the pci probe function. This removes a lot of unnecessary type detection and setup code. Suggested-by: Dan Williams <dan.j.williams@intel.com> Signed-off-by: Dave Jiang <dave.jiang@intel.com> Link: https://lore.kernel.org/r/161852988924.2203940.2787590808682466398.stgit@djiang5-desk3.ch.intel.com Signed-off-by: Vinod Koul <vkoul@kernel.org>
330 lines
7.3 KiB
C
330 lines
7.3 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/* Copyright(c) 2019 Intel Corporation. All rights rsvd. */
|
|
#include <linux/init.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/module.h>
|
|
#include <linux/pci.h>
|
|
#include <linux/device.h>
|
|
#include <linux/sched/task.h>
|
|
#include <linux/intel-svm.h>
|
|
#include <linux/io-64-nonatomic-lo-hi.h>
|
|
#include <linux/cdev.h>
|
|
#include <linux/fs.h>
|
|
#include <linux/poll.h>
|
|
#include <linux/iommu.h>
|
|
#include <uapi/linux/idxd.h>
|
|
#include "registers.h"
|
|
#include "idxd.h"
|
|
|
|
struct idxd_cdev_context {
|
|
const char *name;
|
|
dev_t devt;
|
|
struct ida minor_ida;
|
|
};
|
|
|
|
/*
|
|
* ictx is an array based off of accelerator types. enum idxd_type
|
|
* is used as index
|
|
*/
|
|
static struct idxd_cdev_context ictx[IDXD_TYPE_MAX] = {
|
|
{ .name = "dsa" },
|
|
{ .name = "iax" }
|
|
};
|
|
|
|
struct idxd_user_context {
|
|
struct idxd_wq *wq;
|
|
struct task_struct *task;
|
|
unsigned int pasid;
|
|
unsigned int flags;
|
|
struct iommu_sva *sva;
|
|
};
|
|
|
|
static void idxd_cdev_dev_release(struct device *dev)
|
|
{
|
|
struct idxd_cdev *idxd_cdev = container_of(dev, struct idxd_cdev, dev);
|
|
struct idxd_cdev_context *cdev_ctx;
|
|
struct idxd_wq *wq = idxd_cdev->wq;
|
|
|
|
cdev_ctx = &ictx[wq->idxd->data->type];
|
|
ida_simple_remove(&cdev_ctx->minor_ida, idxd_cdev->minor);
|
|
kfree(idxd_cdev);
|
|
}
|
|
|
|
static struct device_type idxd_cdev_device_type = {
|
|
.name = "idxd_cdev",
|
|
.release = idxd_cdev_dev_release,
|
|
};
|
|
|
|
static inline struct idxd_cdev *inode_idxd_cdev(struct inode *inode)
|
|
{
|
|
struct cdev *cdev = inode->i_cdev;
|
|
|
|
return container_of(cdev, struct idxd_cdev, cdev);
|
|
}
|
|
|
|
static inline struct idxd_wq *inode_wq(struct inode *inode)
|
|
{
|
|
struct idxd_cdev *idxd_cdev = inode_idxd_cdev(inode);
|
|
|
|
return idxd_cdev->wq;
|
|
}
|
|
|
|
static int idxd_cdev_open(struct inode *inode, struct file *filp)
|
|
{
|
|
struct idxd_user_context *ctx;
|
|
struct idxd_device *idxd;
|
|
struct idxd_wq *wq;
|
|
struct device *dev;
|
|
int rc = 0;
|
|
struct iommu_sva *sva;
|
|
unsigned int pasid;
|
|
|
|
wq = inode_wq(inode);
|
|
idxd = wq->idxd;
|
|
dev = &idxd->pdev->dev;
|
|
|
|
dev_dbg(dev, "%s called: %d\n", __func__, idxd_wq_refcount(wq));
|
|
|
|
ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
|
|
if (!ctx)
|
|
return -ENOMEM;
|
|
|
|
mutex_lock(&wq->wq_lock);
|
|
|
|
if (idxd_wq_refcount(wq) > 0 && wq_dedicated(wq)) {
|
|
rc = -EBUSY;
|
|
goto failed;
|
|
}
|
|
|
|
ctx->wq = wq;
|
|
filp->private_data = ctx;
|
|
|
|
if (device_pasid_enabled(idxd)) {
|
|
sva = iommu_sva_bind_device(dev, current->mm, NULL);
|
|
if (IS_ERR(sva)) {
|
|
rc = PTR_ERR(sva);
|
|
dev_err(dev, "pasid allocation failed: %d\n", rc);
|
|
goto failed;
|
|
}
|
|
|
|
pasid = iommu_sva_get_pasid(sva);
|
|
if (pasid == IOMMU_PASID_INVALID) {
|
|
iommu_sva_unbind_device(sva);
|
|
goto failed;
|
|
}
|
|
|
|
ctx->sva = sva;
|
|
ctx->pasid = pasid;
|
|
|
|
if (wq_dedicated(wq)) {
|
|
rc = idxd_wq_set_pasid(wq, pasid);
|
|
if (rc < 0) {
|
|
iommu_sva_unbind_device(sva);
|
|
dev_err(dev, "wq set pasid failed: %d\n", rc);
|
|
goto failed;
|
|
}
|
|
}
|
|
}
|
|
|
|
idxd_wq_get(wq);
|
|
mutex_unlock(&wq->wq_lock);
|
|
return 0;
|
|
|
|
failed:
|
|
mutex_unlock(&wq->wq_lock);
|
|
kfree(ctx);
|
|
return rc;
|
|
}
|
|
|
|
static int idxd_cdev_release(struct inode *node, struct file *filep)
|
|
{
|
|
struct idxd_user_context *ctx = filep->private_data;
|
|
struct idxd_wq *wq = ctx->wq;
|
|
struct idxd_device *idxd = wq->idxd;
|
|
struct device *dev = &idxd->pdev->dev;
|
|
int rc;
|
|
|
|
dev_dbg(dev, "%s called\n", __func__);
|
|
filep->private_data = NULL;
|
|
|
|
/* Wait for in-flight operations to complete. */
|
|
if (wq_shared(wq)) {
|
|
idxd_device_drain_pasid(idxd, ctx->pasid);
|
|
} else {
|
|
if (device_pasid_enabled(idxd)) {
|
|
/* The wq disable in the disable pasid function will drain the wq */
|
|
rc = idxd_wq_disable_pasid(wq);
|
|
if (rc < 0)
|
|
dev_err(dev, "wq disable pasid failed.\n");
|
|
} else {
|
|
idxd_wq_drain(wq);
|
|
}
|
|
}
|
|
|
|
if (ctx->sva)
|
|
iommu_sva_unbind_device(ctx->sva);
|
|
kfree(ctx);
|
|
mutex_lock(&wq->wq_lock);
|
|
idxd_wq_put(wq);
|
|
mutex_unlock(&wq->wq_lock);
|
|
return 0;
|
|
}
|
|
|
|
static int check_vma(struct idxd_wq *wq, struct vm_area_struct *vma,
|
|
const char *func)
|
|
{
|
|
struct device *dev = &wq->idxd->pdev->dev;
|
|
|
|
if ((vma->vm_end - vma->vm_start) > PAGE_SIZE) {
|
|
dev_info_ratelimited(dev,
|
|
"%s: %s: mapping too large: %lu\n",
|
|
current->comm, func,
|
|
vma->vm_end - vma->vm_start);
|
|
return -EINVAL;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int idxd_cdev_mmap(struct file *filp, struct vm_area_struct *vma)
|
|
{
|
|
struct idxd_user_context *ctx = filp->private_data;
|
|
struct idxd_wq *wq = ctx->wq;
|
|
struct idxd_device *idxd = wq->idxd;
|
|
struct pci_dev *pdev = idxd->pdev;
|
|
phys_addr_t base = pci_resource_start(pdev, IDXD_WQ_BAR);
|
|
unsigned long pfn;
|
|
int rc;
|
|
|
|
dev_dbg(&pdev->dev, "%s called\n", __func__);
|
|
rc = check_vma(wq, vma, __func__);
|
|
if (rc < 0)
|
|
return rc;
|
|
|
|
vma->vm_flags |= VM_DONTCOPY;
|
|
pfn = (base + idxd_get_wq_portal_full_offset(wq->id,
|
|
IDXD_PORTAL_LIMITED)) >> PAGE_SHIFT;
|
|
vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
|
|
vma->vm_private_data = ctx;
|
|
|
|
return io_remap_pfn_range(vma, vma->vm_start, pfn, PAGE_SIZE,
|
|
vma->vm_page_prot);
|
|
}
|
|
|
|
static __poll_t idxd_cdev_poll(struct file *filp,
|
|
struct poll_table_struct *wait)
|
|
{
|
|
struct idxd_user_context *ctx = filp->private_data;
|
|
struct idxd_wq *wq = ctx->wq;
|
|
struct idxd_device *idxd = wq->idxd;
|
|
unsigned long flags;
|
|
__poll_t out = 0;
|
|
|
|
poll_wait(filp, &wq->err_queue, wait);
|
|
spin_lock_irqsave(&idxd->dev_lock, flags);
|
|
if (idxd->sw_err.valid)
|
|
out = EPOLLIN | EPOLLRDNORM;
|
|
spin_unlock_irqrestore(&idxd->dev_lock, flags);
|
|
|
|
return out;
|
|
}
|
|
|
|
static const struct file_operations idxd_cdev_fops = {
|
|
.owner = THIS_MODULE,
|
|
.open = idxd_cdev_open,
|
|
.release = idxd_cdev_release,
|
|
.mmap = idxd_cdev_mmap,
|
|
.poll = idxd_cdev_poll,
|
|
};
|
|
|
|
int idxd_cdev_get_major(struct idxd_device *idxd)
|
|
{
|
|
return MAJOR(ictx[idxd->data->type].devt);
|
|
}
|
|
|
|
int idxd_wq_add_cdev(struct idxd_wq *wq)
|
|
{
|
|
struct idxd_device *idxd = wq->idxd;
|
|
struct idxd_cdev *idxd_cdev;
|
|
struct cdev *cdev;
|
|
struct device *dev;
|
|
struct idxd_cdev_context *cdev_ctx;
|
|
int rc, minor;
|
|
|
|
idxd_cdev = kzalloc(sizeof(*idxd_cdev), GFP_KERNEL);
|
|
if (!idxd_cdev)
|
|
return -ENOMEM;
|
|
|
|
idxd_cdev->wq = wq;
|
|
cdev = &idxd_cdev->cdev;
|
|
dev = &idxd_cdev->dev;
|
|
cdev_ctx = &ictx[wq->idxd->data->type];
|
|
minor = ida_simple_get(&cdev_ctx->minor_ida, 0, MINORMASK, GFP_KERNEL);
|
|
if (minor < 0) {
|
|
kfree(idxd_cdev);
|
|
return minor;
|
|
}
|
|
idxd_cdev->minor = minor;
|
|
|
|
device_initialize(dev);
|
|
dev->parent = &wq->conf_dev;
|
|
dev->bus = &dsa_bus_type;
|
|
dev->type = &idxd_cdev_device_type;
|
|
dev->devt = MKDEV(MAJOR(cdev_ctx->devt), minor);
|
|
|
|
rc = dev_set_name(dev, "%s/wq%u.%u", idxd->data->name_prefix, idxd->id, wq->id);
|
|
if (rc < 0)
|
|
goto err;
|
|
|
|
wq->idxd_cdev = idxd_cdev;
|
|
cdev_init(cdev, &idxd_cdev_fops);
|
|
rc = cdev_device_add(cdev, dev);
|
|
if (rc) {
|
|
dev_dbg(&wq->idxd->pdev->dev, "cdev_add failed: %d\n", rc);
|
|
goto err;
|
|
}
|
|
|
|
return 0;
|
|
|
|
err:
|
|
put_device(dev);
|
|
wq->idxd_cdev = NULL;
|
|
return rc;
|
|
}
|
|
|
|
void idxd_wq_del_cdev(struct idxd_wq *wq)
|
|
{
|
|
struct idxd_cdev *idxd_cdev;
|
|
struct idxd_cdev_context *cdev_ctx;
|
|
|
|
cdev_ctx = &ictx[wq->idxd->data->type];
|
|
idxd_cdev = wq->idxd_cdev;
|
|
wq->idxd_cdev = NULL;
|
|
cdev_device_del(&idxd_cdev->cdev, &idxd_cdev->dev);
|
|
put_device(&idxd_cdev->dev);
|
|
}
|
|
|
|
int idxd_cdev_register(void)
|
|
{
|
|
int rc, i;
|
|
|
|
for (i = 0; i < IDXD_TYPE_MAX; i++) {
|
|
ida_init(&ictx[i].minor_ida);
|
|
rc = alloc_chrdev_region(&ictx[i].devt, 0, MINORMASK,
|
|
ictx[i].name);
|
|
if (rc)
|
|
return rc;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
void idxd_cdev_remove(void)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < IDXD_TYPE_MAX; i++) {
|
|
unregister_chrdev_region(ictx[i].devt, MINORMASK);
|
|
ida_destroy(&ictx[i].minor_ida);
|
|
}
|
|
}
|