litmus-rt-ext-res.git - LITMUS^RT with extended reservations for Forbidden Zones paper @ RTAS'20

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/*
 * Freescale Hypervisor Management Driver

 * Copyright (C) 2008-2011 Freescale Semiconductor, Inc.
 * Author: Timur Tabi <timur@freescale.com>
 *
 * This file is licensed under the terms of the GNU General Public License
 * version 2.  This program is licensed "as is" without any warranty of any
 * kind, whether express or implied.
 *
 * The Freescale hypervisor management driver provides several services to
 * drivers and applications related to the Freescale hypervisor:
 *
 * 1. An ioctl interface for querying and managing partitions.
 *
 * 2. A file interface to reading incoming doorbells.
 *
 * 3. An interrupt handler for shutting down the partition upon receiving the
 *    shutdown doorbell from a manager partition.
 *
 * 4. A kernel interface for receiving callbacks when a managed partition
 *    shuts down.
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/types.h>
#include <linux/err.h>
#include <linux/fs.h>
#include <linux/miscdevice.h>
#include <linux/mm.h>
#include <linux/pagemap.h>
#include <linux/slab.h>
#include <linux/poll.h>
#include <linux/of.h>
#include <linux/reboot.h>
#include <linux/uaccess.h>
#include <linux/notifier.h>
#include <linux/interrupt.h>

#include <linux/io.h>
#include <asm/fsl_hcalls.h>

#include <linux/fsl_hypervisor.h>

static BLOCKING_NOTIFIER_HEAD(failover_subscribers);

/*
 * Ioctl interface for FSL_HV_IOCTL_PARTITION_RESTART
 *
 * Restart a running partition
 */
static long ioctl_restart(struct fsl_hv_ioctl_restart __user *p)
{
	struct fsl_hv_ioctl_restart param;

	/* Get the parameters from the user */
	if (copy_from_user(&param, p, sizeof(struct fsl_hv_ioctl_restart)))
		return -EFAULT;

	param.ret = fh_partition_restart(param.partition);

	if (copy_to_user(&p->ret, &param.ret, sizeof(__u32)))
		return -EFAULT;

	return 0;
}

/*
 * Ioctl interface for FSL_HV_IOCTL_PARTITION_STATUS
 *
 * Query the status of a partition
 */
static long ioctl_status(struct fsl_hv_ioctl_status __user *p)
{
	struct fsl_hv_ioctl_status param;
	u32 status;

	/* Get the parameters from the user */
	if (copy_from_user(&param, p, sizeof(struct fsl_hv_ioctl_status)))
		return -EFAULT;

	param.ret = fh_partition_get_status(param.partition, &status);
	if (!param.ret)
		param.status = status;

	if (copy_to_user(p, &param, sizeof(struct fsl_hv_ioctl_status)))
		return -EFAULT;

	return 0;
}

/*
 * Ioctl interface for FSL_HV_IOCTL_PARTITION_START
 *
 * Start a stopped partition.
 */
static long ioctl_start(struct fsl_hv_ioctl_start __user *p)
{
	struct fsl_hv_ioctl_start param;

	/* Get the parameters from the user */
	if (copy_from_user(&param, p, sizeof(struct fsl_hv_ioctl_start)))
		return -EFAULT;

	param.ret = fh_partition_start(param.partition, param.entry_point,
				       param.load);

	if (copy_to_user(&p->ret, &param.ret, sizeof(__u32)))
		return -EFAULT;

	return 0;
}

/*
 * Ioctl interface for FSL_HV_IOCTL_PARTITION_STOP
 *
 * Stop a running partition
 */
static long ioctl_stop(struct fsl_hv_ioctl_stop __user *p)
{
	struct fsl_hv_ioctl_stop param;

	/* Get the parameters from the user */
	if (copy_from_user(&param, p, sizeof(struct fsl_hv_ioctl_stop)))
		return -EFAULT;

	param.ret = fh_partition_stop(param.partition);

	if (copy_to_user(&p->ret, &param.ret, sizeof(__u32)))
		return -EFAULT;

	return 0;
}

/*
 * Ioctl interface for FSL_HV_IOCTL_MEMCPY
 *
 * The FH_MEMCPY hypercall takes an array of address/address/size structures
 * to represent the data being copied.  As a convenience to the user, this
 * ioctl takes a user-create buffer and a pointer to a guest physically
 * contiguous buffer in the remote partition, and creates the
 * address/address/size array for the hypercall.
 */
static long ioctl_memcpy(struct fsl_hv_ioctl_memcpy __user *p)
{
	struct fsl_hv_ioctl_memcpy param;

	struct page **pages = NULL;
	void *sg_list_unaligned = NULL;
	struct fh_sg_list *sg_list = NULL;

	unsigned int num_pages;
	unsigned long lb_offset; /* Offset within a page of the local buffer */

	unsigned int i;
	long ret = 0;
	int num_pinned; /* return value from get_user_pages() */
	phys_addr_t remote_paddr; /* The next address in the remote buffer */
	uint32_t count; /* The number of bytes left to copy */

	/* Get the parameters from the user */
	if (copy_from_user(&param, p, sizeof(struct fsl_hv_ioctl_memcpy)))
		return -EFAULT;

	/*
	 * One partition must be local, the other must be remote.  In other
	 * words, if source and target are both -1, or are both not -1, then
	 * return an error.
	 */
	if ((param.source == -1) == (param.target == -1))
		return -EINVAL;

	/*
	 * The array of pages returned by get_user_pages() covers only
	 * page-aligned memory.  Since the user buffer is probably not
	 * page-aligned, we need to handle the discrepancy.
	 *
	 * We calculate the offset within a page of the S/G list, and make
	 * adjustments accordingly.  This will result in a page list that looks
	 * like this:
	 *
	 *      ----    <-- first page starts before the buffer
	 *     |    |
	 *     |////|-> ----
	 *     |////|  |    |
	 *      ----   |    |
	 *             |    |
	 *      ----   |    |
	 *     |////|  |    |
	 *     |////|  |    |
	 *     |////|  |    |
	 *      ----   |    |
	 *             |    |
	 *      ----   |    |
	 *     |////|  |    |
	 *     |////|  |    |
	 *     |////|  |    |
	 *      ----   |    |
	 *             |    |
	 *      ----   |    |
	 *     |////|  |    |
	 *     |////|-> ----
	 *     |    |   <-- last page ends after the buffer
	 *      ----
	 *
	 * The distance between the start of the first page and the start of the
	 * buffer is lb_offset.  The hashed (///) areas are the parts of the
	 * page list that contain the actual buffer.
	 *
	 * The advantage of this approach is that the number of pages is
	 * equal to the number of entries in the S/G list that we give to the
	 * hypervisor.
	 */
	lb_offset = param.local_vaddr & (PAGE_SIZE - 1);
	num_pages = (param.count + lb_offset + PAGE_SIZE - 1) >> PAGE_SHIFT;

	/* Allocate the buffers we need */

	/*
	 * 'pages' is an array of struct page pointers that's initialized by
	 * get_user_pages().
	 */
	pages = kzalloc(num_pages * sizeof(struct page *), GFP_KERNEL);
	if (!pages) {
		pr_debug("fsl-hv: could not allocate page list\n");
		return -ENOMEM;
	}

	/*
	 * sg_list is the list of fh_sg_list objects that we pass to the
	 * hypervisor.
	 */
	sg_list_unaligned = kmalloc(num_pages * sizeof(struct fh_sg_list) +
		sizeof(struct fh_sg_list) - 1, GFP_KERNEL);
	if (!sg_list_unaligned) {
		pr_debug("fsl-hv: could not allocate S/G list\n");
		ret = -ENOMEM;
		goto exit;
	}
	sg_list = PTR_ALIGN(sg_list_unaligned, sizeof(struct fh_sg_list));

	/* Get the physical addresses of the source buffer */
	down_read(&current->mm->mmap_sem);
	num_pinned = get_user_pages(current, current->mm,
		param.local_vaddr - lb_offset, num_pages,
		(param.source == -1) ? READ : WRITE,
		0, pages, NULL);
	up_read(&current->mm->mmap_sem);

	if (num_pinned != num_pages) {
		/* get_user_pages() failed */
		pr_debug("fsl-hv: could not lock source buffer\n");
		ret = (num_pinned < 0) ? num_pinned : -EFAULT;
		goto exit;
	}

	/*
	 * Build the fh_sg_list[] array.  The first page is special
	 * because it's misaligned.
	 */
	if (param.source == -1) {
		sg_list[0].source = page_to_phys(pages[0]) + lb_offset;
		sg_list[0].target = param.remote_paddr;
	} else {
		sg_list[0].source = param.remote_paddr;
		sg_list[0].target = page_to_phys(pages[0]) + lb_offset;
	}
	sg_list[0].size = min_t(uint64_t, param.count, PAGE_SIZE - lb_offset);

	remote_paddr = param.remote_paddr + sg_list[0].size;
	count = param.count - sg_list[0].size;

	for (i = 1; i < num_pages; i++) {
		if (param.source == -1) {
			/* local to remote */
			sg_list[i].source = page_to_phys(pages[i]);
			sg_list[i].target = remote_paddr;
		} else {
			/* remote to local */
			sg_list[i].source = remote_paddr;
			sg_list[i].target = page_to_phys(pages[i]);
		}
		sg_list[i].size = min_t(uint64_t, count, PAGE_SIZE);

		remote_paddr += sg_list[i].size;
		count -= sg_list[i].size;
	}

	param.ret = fh_partition_memcpy(param.source, param.target,
		virt_to_phys(sg_list), num_pages);

exit:
	if (pages) {
		for (i = 0; i < num_pages; i++)
			if (pages[i])
				put_page(pages[i]);
	}

	kfree(sg_list_unaligned);
	kfree(pages);

	if (!ret)
		if (copy_to_user(&p->ret, &param.ret, sizeof(__u32)))
			return -EFAULT;

	return ret;
}

/*
 * Ioctl interface for FSL_HV_IOCTL_DOORBELL
 *
 * Ring a doorbell
 */
static long ioctl_doorbell(struct fsl_hv_ioctl_doorbell __user *p)
{
	struct fsl_hv_ioctl_doorbell param;

	/* Get the parameters from the user. */
	if (copy_from_user(&param, p, sizeof(struct fsl_hv_ioctl_doorbell)))
		return -EFAULT;

	param.ret = ev_doorbell_send(param.doorbell);

	if (copy_to_user(&p->ret, &param.ret, sizeof(__u32)))
		return -EFAULT;

	return 0;
}

static long ioctl_dtprop(struct fsl_hv_ioctl_prop __user *p, int set)
{
	struct fsl_hv_ioctl_prop param;
	char __user *upath, *upropname;
	void __user *upropval;
	char *path = NULL, *propname = NULL;
	void *propval = NULL;
	int ret = 0;

	/* Get the parameters from the user. */
	if (copy_from_user(&param, p, sizeof(struct fsl_hv_ioctl_prop)))
		return -EFAULT;

	upath = (char __user *)(uintptr_t)param.path;
	upropname = (char __user *)(uintptr_t)param.propname;
	upropval = (void __user *)(uintptr_t)param.propval;

	path = strndup_user(upath, FH_DTPROP_MAX_PATHLEN);
	if (IS_ERR(path)) {
		ret = PTR_ERR(path);
		goto out;
	}


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