Revision 32ffa4f71e10009498ae6b54da65ab316db967bd authored by Axel Rasmussen on 19 May 2021, 20:03:33 UTC, committed by Paolo Bonzini on 27 May 2021, 11:45:55 UTC
This is a preparatory commit needed before we can use different kinds of backing pages for guest memory. Previously, we used perf_test_args.host_page_size, which is the host's native page size (commonly 4K). For VM_MEM_SRC_ANONYMOUS this turns out to be okay, but in a follow-up commit we want to allow using different kinds of backing memory. Take VM_MEM_SRC_ANONYMOUS_HUGETLB for example. Without this change, if we used that backing page type, when we issued a UFFDIO_COPY ioctl we'd only do so with 4K, rather than the full 2M of a backing hugepage. In this case, UFFDIO_COPY returns -EINVAL (__mcopy_atomic_hugetlb checks the size). Signed-off-by: Axel Rasmussen <axelrasmussen@google.com> Message-Id: <20210519200339.829146-5-axelrasmussen@google.com> Reviewed-by: Ben Gardon <bgardon@google.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
1 parent 25408e5
core.c
// SPDX-License-Identifier: GPL-2.0-only
/*
* Generic driver for NXP NCI NFC chips
*
* Copyright (C) 2014 NXP Semiconductors All rights reserved.
*
* Authors: Clément Perrochaud <clement.perrochaud@nxp.com>
*
* Derived from PN544 device driver:
* Copyright (C) 2012 Intel Corporation. All rights reserved.
*/
#include <linux/delay.h>
#include <linux/module.h>
#include <linux/nfc.h>
#include <net/nfc/nci_core.h>
#include "nxp-nci.h"
#define NXP_NCI_HDR_LEN 4
#define NXP_NCI_NFC_PROTOCOLS (NFC_PROTO_JEWEL_MASK | \
NFC_PROTO_MIFARE_MASK | \
NFC_PROTO_FELICA_MASK | \
NFC_PROTO_ISO14443_MASK | \
NFC_PROTO_ISO14443_B_MASK | \
NFC_PROTO_NFC_DEP_MASK)
static int nxp_nci_open(struct nci_dev *ndev)
{
struct nxp_nci_info *info = nci_get_drvdata(ndev);
int r = 0;
mutex_lock(&info->info_lock);
if (info->mode != NXP_NCI_MODE_COLD) {
r = -EBUSY;
goto open_exit;
}
if (info->phy_ops->set_mode)
r = info->phy_ops->set_mode(info->phy_id, NXP_NCI_MODE_NCI);
info->mode = NXP_NCI_MODE_NCI;
open_exit:
mutex_unlock(&info->info_lock);
return r;
}
static int nxp_nci_close(struct nci_dev *ndev)
{
struct nxp_nci_info *info = nci_get_drvdata(ndev);
int r = 0;
mutex_lock(&info->info_lock);
if (info->phy_ops->set_mode)
r = info->phy_ops->set_mode(info->phy_id, NXP_NCI_MODE_COLD);
info->mode = NXP_NCI_MODE_COLD;
mutex_unlock(&info->info_lock);
return r;
}
static int nxp_nci_send(struct nci_dev *ndev, struct sk_buff *skb)
{
struct nxp_nci_info *info = nci_get_drvdata(ndev);
int r;
if (!info->phy_ops->write) {
r = -ENOTSUPP;
goto send_exit;
}
if (info->mode != NXP_NCI_MODE_NCI) {
r = -EINVAL;
goto send_exit;
}
r = info->phy_ops->write(info->phy_id, skb);
if (r < 0)
kfree_skb(skb);
send_exit:
return r;
}
static struct nci_ops nxp_nci_ops = {
.open = nxp_nci_open,
.close = nxp_nci_close,
.send = nxp_nci_send,
.fw_download = nxp_nci_fw_download,
};
int nxp_nci_probe(void *phy_id, struct device *pdev,
const struct nxp_nci_phy_ops *phy_ops,
unsigned int max_payload,
struct nci_dev **ndev)
{
struct nxp_nci_info *info;
int r;
info = devm_kzalloc(pdev, sizeof(struct nxp_nci_info), GFP_KERNEL);
if (!info) {
r = -ENOMEM;
goto probe_exit;
}
info->phy_id = phy_id;
info->pdev = pdev;
info->phy_ops = phy_ops;
info->max_payload = max_payload;
INIT_WORK(&info->fw_info.work, nxp_nci_fw_work);
init_completion(&info->fw_info.cmd_completion);
mutex_init(&info->info_lock);
if (info->phy_ops->set_mode) {
r = info->phy_ops->set_mode(info->phy_id, NXP_NCI_MODE_COLD);
if (r < 0)
goto probe_exit;
}
info->mode = NXP_NCI_MODE_COLD;
info->ndev = nci_allocate_device(&nxp_nci_ops, NXP_NCI_NFC_PROTOCOLS,
NXP_NCI_HDR_LEN, 0);
if (!info->ndev) {
r = -ENOMEM;
goto probe_exit;
}
nci_set_parent_dev(info->ndev, pdev);
nci_set_drvdata(info->ndev, info);
r = nci_register_device(info->ndev);
if (r < 0)
goto probe_exit_free_nci;
*ndev = info->ndev;
goto probe_exit;
probe_exit_free_nci:
nci_free_device(info->ndev);
probe_exit:
return r;
}
EXPORT_SYMBOL(nxp_nci_probe);
void nxp_nci_remove(struct nci_dev *ndev)
{
struct nxp_nci_info *info = nci_get_drvdata(ndev);
if (info->mode == NXP_NCI_MODE_FW)
nxp_nci_fw_work_complete(info, -ESHUTDOWN);
cancel_work_sync(&info->fw_info.work);
mutex_lock(&info->info_lock);
if (info->phy_ops->set_mode)
info->phy_ops->set_mode(info->phy_id, NXP_NCI_MODE_COLD);
nci_unregister_device(ndev);
nci_free_device(ndev);
mutex_unlock(&info->info_lock);
}
EXPORT_SYMBOL(nxp_nci_remove);
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("NXP NCI NFC driver");
MODULE_AUTHOR("Clément Perrochaud <clement.perrochaud@nxp.com>");
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