/* Get a struct file and fd for a context and attach the ops */
struct file *cxl_get_fd(struct cxl_context *ctx, struct file_operations *fops,
int *fd)
{
struct file *file;
int rc, flags, fdtmp;
char *name = NULL;
/* only allow one per context */
if (ctx->mapping)
return ERR_PTR(-EEXIST);
flags = O_RDWR | O_CLOEXEC;
/* This code is similar to anon_inode_getfd() */
rc = get_unused_fd_flags(flags);
if (rc < 0)
return ERR_PTR(rc);
fdtmp = rc;
/*
* Patch the file ops. Needs to be careful that this is rentrant safe.
*/
if (fops) {
PATCH_FOPS(open);
PATCH_FOPS(poll);
PATCH_FOPS(read);
PATCH_FOPS(release);
PATCH_FOPS(unlocked_ioctl);
PATCH_FOPS(compat_ioctl);
PATCH_FOPS(mmap);
} else /* use default ops */
fops = (struct file_operations *)&afu_fops;
name = kasprintf(GFP_KERNEL, "cxl:%d", ctx->pe);
file = cxl_getfile(name, fops, ctx, flags);
kfree(name);
if (IS_ERR(file))
goto err_fd;
cxl_context_set_mapping(ctx, file->f_mapping);
*fd = fdtmp;
return file;
err_fd:
put_unused_fd(fdtmp);
return NULL;
}
static int __afu_open(struct inode *inode, struct file *file, bool master)
{
struct cxl *adapter;
struct cxl_afu *afu;
struct cxl_context *ctx;
int adapter_num = CXL_DEVT_ADAPTER(inode->i_rdev);
int slice = CXL_DEVT_AFU(inode->i_rdev);
int rc = -ENODEV;
pr_devel("afu_open afu%i.%i\n", slice, adapter_num);
if (!(adapter = get_cxl_adapter(adapter_num)))
return -ENODEV;
if (slice > adapter->slices)
goto err_put_adapter;
spin_lock(&adapter->afu_list_lock);
if (!(afu = adapter->afu[slice])) {
spin_unlock(&adapter->afu_list_lock);
goto err_put_adapter;
}
/*
* taking a ref to the afu so that it doesn't go away
* for rest of the function. This ref is released before
* we return.
*/
cxl_afu_get(afu);
spin_unlock(&adapter->afu_list_lock);
if (!afu->current_mode)
goto err_put_afu;
if (!cxl_ops->link_ok(adapter, afu)) {
rc = -EIO;
goto err_put_afu;
}
if (!(ctx = cxl_context_alloc())) {
rc = -ENOMEM;
goto err_put_afu;
}
rc = cxl_context_init(ctx, afu, master);
if (rc)
goto err_put_afu;
cxl_context_set_mapping(ctx, inode->i_mapping);
pr_devel("afu_open pe: %i\n", ctx->pe);
file->private_data = ctx;
cxl_ctx_get();
/* indicate success */
rc = 0;
err_put_afu:
/* release the ref taken earlier */
cxl_afu_put(afu);
err_put_adapter:
put_device(&adapter->dev);
return rc;
}
