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>
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pata_isapnp.c
// SPDX-License-Identifier: GPL-2.0-only
/*
* pata-isapnp.c - ISA PnP PATA controller driver.
* Copyright 2005/2006 Red Hat Inc, all rights reserved.
*
* Based in part on ide-pnp.c by Andrey Panin <pazke@donpac.ru>
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/isapnp.h>
#include <linux/init.h>
#include <linux/blkdev.h>
#include <linux/delay.h>
#include <scsi/scsi_host.h>
#include <linux/ata.h>
#include <linux/libata.h>
#define DRV_NAME "pata_isapnp"
#define DRV_VERSION "0.2.5"
static struct scsi_host_template isapnp_sht = {
ATA_PIO_SHT(DRV_NAME),
};
static struct ata_port_operations isapnp_port_ops = {
.inherits = &ata_sff_port_ops,
.cable_detect = ata_cable_40wire,
};
static struct ata_port_operations isapnp_noalt_port_ops = {
.inherits = &ata_sff_port_ops,
.cable_detect = ata_cable_40wire,
/* No altstatus so we don't want to use the lost interrupt poll */
.lost_interrupt = ATA_OP_NULL,
};
/**
* isapnp_init_one - attach an isapnp interface
* @idev: PnP device
* @dev_id: matching detect line
*
* Register an ISA bus IDE interface. Such interfaces are PIO 0 and
* non shared IRQ.
*/
static int isapnp_init_one(struct pnp_dev *idev, const struct pnp_device_id *dev_id)
{
struct ata_host *host;
struct ata_port *ap;
void __iomem *cmd_addr, *ctl_addr;
int irq = 0;
irq_handler_t handler = NULL;
if (pnp_port_valid(idev, 0) == 0)
return -ENODEV;
if (pnp_irq_valid(idev, 0)) {
irq = pnp_irq(idev, 0);
handler = ata_sff_interrupt;
}
/* allocate host */
host = ata_host_alloc(&idev->dev, 1);
if (!host)
return -ENOMEM;
/* acquire resources and fill host */
cmd_addr = devm_ioport_map(&idev->dev, pnp_port_start(idev, 0), 8);
if (!cmd_addr)
return -ENOMEM;
ap = host->ports[0];
ap->ops = &isapnp_noalt_port_ops;
ap->pio_mask = ATA_PIO0;
ap->flags |= ATA_FLAG_SLAVE_POSS;
ap->ioaddr.cmd_addr = cmd_addr;
if (pnp_port_valid(idev, 1)) {
ctl_addr = devm_ioport_map(&idev->dev,
pnp_port_start(idev, 1), 1);
ap->ioaddr.altstatus_addr = ctl_addr;
ap->ioaddr.ctl_addr = ctl_addr;
ap->ops = &isapnp_port_ops;
}
ata_sff_std_ports(&ap->ioaddr);
ata_port_desc(ap, "cmd 0x%llx ctl 0x%llx",
(unsigned long long)pnp_port_start(idev, 0),
(unsigned long long)pnp_port_start(idev, 1));
/* activate */
return ata_host_activate(host, irq, handler, 0,
&isapnp_sht);
}
/**
* isapnp_remove_one - unplug an isapnp interface
* @idev: PnP device
*
* Remove a previously configured PnP ATA port. Called only on module
* unload events as the core does not currently deal with ISAPnP docking.
*/
static void isapnp_remove_one(struct pnp_dev *idev)
{
struct device *dev = &idev->dev;
struct ata_host *host = dev_get_drvdata(dev);
ata_host_detach(host);
}
static struct pnp_device_id isapnp_devices[] = {
/* Generic ESDI/IDE/ATA compatible hard disk controller */
{.id = "PNP0600", .driver_data = 0},
{.id = ""}
};
MODULE_DEVICE_TABLE(pnp, isapnp_devices);
static struct pnp_driver isapnp_driver = {
.name = DRV_NAME,
.id_table = isapnp_devices,
.probe = isapnp_init_one,
.remove = isapnp_remove_one,
};
module_pnp_driver(isapnp_driver);
MODULE_AUTHOR("Alan Cox");
MODULE_DESCRIPTION("low-level driver for ISA PnP ATA");
MODULE_LICENSE("GPL");
MODULE_VERSION(DRV_VERSION);
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