3c726f8dee
Adds a new CONFIG_PPC_64K_PAGES which, when enabled, changes the kernel base page size to 64K. The resulting kernel still boots on any hardware. On current machines with 4K pages support only, the kernel will maintain 16 "subpages" for each 64K page transparently. Note that while real 64K capable HW has been tested, the current patch will not enable it yet as such hardware is not released yet, and I'm still verifying with the firmware architects the proper to get the information from the newer hypervisors. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
675 lines
19 KiB
C
675 lines
19 KiB
C
/* -*- linux-c -*-
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*
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* iSeries Virtual I/O Message Path code
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*
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* Authors: Dave Boutcher <boutcher@us.ibm.com>
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* Ryan Arnold <ryanarn@us.ibm.com>
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* Colin Devilbiss <devilbis@us.ibm.com>
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*
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* (C) Copyright 2000-2005 IBM Corporation
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*
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* This code is used by the iSeries virtual disk, cd,
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* tape, and console to communicate with OS/400 in another
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* partition.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of the
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* License, or (at your option) anyu later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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*/
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/errno.h>
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#include <linux/vmalloc.h>
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#include <linux/string.h>
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#include <linux/proc_fs.h>
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#include <linux/dma-mapping.h>
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#include <linux/wait.h>
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#include <linux/seq_file.h>
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#include <linux/smp_lock.h>
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#include <linux/interrupt.h>
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#include <asm/system.h>
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#include <asm/uaccess.h>
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#include <asm/iseries/hv_types.h>
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#include <asm/iseries/it_exp_vpd_panel.h>
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#include <asm/iseries/hv_lp_event.h>
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#include <asm/iseries/hv_lp_config.h>
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#include <asm/iseries/mf.h>
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#include <asm/iseries/vio.h>
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/* Status of the path to each other partition in the system.
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* This is overkill, since we will only ever establish connections
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* to our hosting partition and the primary partition on the system.
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* But this allows for other support in the future.
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*/
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static struct viopathStatus {
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int isOpen; /* Did we open the path? */
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int isActive; /* Do we have a mon msg outstanding */
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int users[VIO_MAX_SUBTYPES];
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HvLpInstanceId mSourceInst;
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HvLpInstanceId mTargetInst;
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int numberAllocated;
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} viopathStatus[HVMAXARCHITECTEDLPS];
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static DEFINE_SPINLOCK(statuslock);
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/*
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* For each kind of event we allocate a buffer that is
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* guaranteed not to cross a page boundary
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*/
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static unsigned char event_buffer[VIO_MAX_SUBTYPES * 256]
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__attribute__((__aligned__(4096)));
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static atomic_t event_buffer_available[VIO_MAX_SUBTYPES];
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static int event_buffer_initialised;
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static void handleMonitorEvent(struct HvLpEvent *event);
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/*
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* We use this structure to handle asynchronous responses. The caller
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* blocks on the semaphore and the handler posts the semaphore. However,
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* if system_state is not SYSTEM_RUNNING, then wait_atomic is used ...
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*/
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struct alloc_parms {
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struct semaphore sem;
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int number;
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atomic_t wait_atomic;
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int used_wait_atomic;
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};
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/* Put a sequence number in each mon msg. The value is not
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* important. Start at something other than 0 just for
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* readability. wrapping this is ok.
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*/
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static u8 viomonseq = 22;
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/* Our hosting logical partition. We get this at startup
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* time, and different modules access this variable directly.
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*/
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HvLpIndex viopath_hostLp = HvLpIndexInvalid;
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EXPORT_SYMBOL(viopath_hostLp);
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HvLpIndex viopath_ourLp = HvLpIndexInvalid;
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EXPORT_SYMBOL(viopath_ourLp);
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/* For each kind of incoming event we set a pointer to a
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* routine to call.
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*/
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static vio_event_handler_t *vio_handler[VIO_MAX_SUBTYPES];
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#define VIOPATH_KERN_WARN KERN_WARNING "viopath: "
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#define VIOPATH_KERN_INFO KERN_INFO "viopath: "
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static int proc_viopath_show(struct seq_file *m, void *v)
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{
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char *buf;
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u16 vlanMap;
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dma_addr_t handle;
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HvLpEvent_Rc hvrc;
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DECLARE_MUTEX_LOCKED(Semaphore);
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buf = kmalloc(HW_PAGE_SIZE, GFP_KERNEL);
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if (!buf)
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return 0;
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memset(buf, 0, HW_PAGE_SIZE);
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handle = dma_map_single(iSeries_vio_dev, buf, HW_PAGE_SIZE,
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DMA_FROM_DEVICE);
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hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp,
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HvLpEvent_Type_VirtualIo,
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viomajorsubtype_config | vioconfigget,
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HvLpEvent_AckInd_DoAck, HvLpEvent_AckType_ImmediateAck,
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viopath_sourceinst(viopath_hostLp),
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viopath_targetinst(viopath_hostLp),
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(u64)(unsigned long)&Semaphore, VIOVERSION << 16,
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((u64)handle) << 32, HW_PAGE_SIZE, 0, 0);
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if (hvrc != HvLpEvent_Rc_Good)
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printk(VIOPATH_KERN_WARN "hv error on op %d\n", (int)hvrc);
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down(&Semaphore);
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vlanMap = HvLpConfig_getVirtualLanIndexMap();
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buf[HW_PAGE_SIZE-1] = '\0';
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seq_printf(m, "%s", buf);
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seq_printf(m, "AVAILABLE_VETH=%x\n", vlanMap);
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seq_printf(m, "SRLNBR=%c%c%c%c%c%c%c\n",
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e2a(xItExtVpdPanel.mfgID[2]),
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e2a(xItExtVpdPanel.mfgID[3]),
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e2a(xItExtVpdPanel.systemSerial[1]),
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e2a(xItExtVpdPanel.systemSerial[2]),
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e2a(xItExtVpdPanel.systemSerial[3]),
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e2a(xItExtVpdPanel.systemSerial[4]),
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e2a(xItExtVpdPanel.systemSerial[5]));
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dma_unmap_single(iSeries_vio_dev, handle, HW_PAGE_SIZE,
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DMA_FROM_DEVICE);
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kfree(buf);
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return 0;
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}
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static int proc_viopath_open(struct inode *inode, struct file *file)
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{
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return single_open(file, proc_viopath_show, NULL);
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}
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static struct file_operations proc_viopath_operations = {
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.open = proc_viopath_open,
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.read = seq_read,
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.llseek = seq_lseek,
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.release = single_release,
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};
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static int __init vio_proc_init(void)
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{
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struct proc_dir_entry *e;
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e = create_proc_entry("iSeries/config", 0, NULL);
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if (e)
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e->proc_fops = &proc_viopath_operations;
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return 0;
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}
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__initcall(vio_proc_init);
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/* See if a given LP is active. Allow for invalid lps to be passed in
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* and just return invalid
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*/
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int viopath_isactive(HvLpIndex lp)
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{
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if (lp == HvLpIndexInvalid)
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return 0;
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if (lp < HVMAXARCHITECTEDLPS)
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return viopathStatus[lp].isActive;
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else
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return 0;
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}
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EXPORT_SYMBOL(viopath_isactive);
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/*
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* We cache the source and target instance ids for each
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* partition.
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*/
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HvLpInstanceId viopath_sourceinst(HvLpIndex lp)
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{
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return viopathStatus[lp].mSourceInst;
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}
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EXPORT_SYMBOL(viopath_sourceinst);
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HvLpInstanceId viopath_targetinst(HvLpIndex lp)
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{
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return viopathStatus[lp].mTargetInst;
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}
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EXPORT_SYMBOL(viopath_targetinst);
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/*
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* Send a monitor message. This is a message with the acknowledge
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* bit on that the other side will NOT explicitly acknowledge. When
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* the other side goes down, the hypervisor will acknowledge any
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* outstanding messages....so we will know when the other side dies.
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*/
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static void sendMonMsg(HvLpIndex remoteLp)
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{
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HvLpEvent_Rc hvrc;
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viopathStatus[remoteLp].mSourceInst =
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HvCallEvent_getSourceLpInstanceId(remoteLp,
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HvLpEvent_Type_VirtualIo);
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viopathStatus[remoteLp].mTargetInst =
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HvCallEvent_getTargetLpInstanceId(remoteLp,
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HvLpEvent_Type_VirtualIo);
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/*
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* Deliberately ignore the return code here. if we call this
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* more than once, we don't care.
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*/
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vio_setHandler(viomajorsubtype_monitor, handleMonitorEvent);
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hvrc = HvCallEvent_signalLpEventFast(remoteLp, HvLpEvent_Type_VirtualIo,
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viomajorsubtype_monitor, HvLpEvent_AckInd_DoAck,
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HvLpEvent_AckType_DeferredAck,
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viopathStatus[remoteLp].mSourceInst,
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viopathStatus[remoteLp].mTargetInst,
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viomonseq++, 0, 0, 0, 0, 0);
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if (hvrc == HvLpEvent_Rc_Good)
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viopathStatus[remoteLp].isActive = 1;
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else {
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printk(VIOPATH_KERN_WARN "could not connect to partition %d\n",
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remoteLp);
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viopathStatus[remoteLp].isActive = 0;
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}
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}
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static void handleMonitorEvent(struct HvLpEvent *event)
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{
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HvLpIndex remoteLp;
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int i;
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/*
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* This handler is _also_ called as part of the loop
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* at the end of this routine, so it must be able to
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* ignore NULL events...
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*/
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if (!event)
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return;
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/*
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* First see if this is just a normal monitor message from the
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* other partition
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*/
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if (event->xFlags.xFunction == HvLpEvent_Function_Int) {
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remoteLp = event->xSourceLp;
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if (!viopathStatus[remoteLp].isActive)
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sendMonMsg(remoteLp);
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return;
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}
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/*
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* This path is for an acknowledgement; the other partition
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* died
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*/
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remoteLp = event->xTargetLp;
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if ((event->xSourceInstanceId != viopathStatus[remoteLp].mSourceInst) ||
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(event->xTargetInstanceId != viopathStatus[remoteLp].mTargetInst)) {
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printk(VIOPATH_KERN_WARN "ignoring ack....mismatched instances\n");
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return;
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}
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printk(VIOPATH_KERN_WARN "partition %d ended\n", remoteLp);
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viopathStatus[remoteLp].isActive = 0;
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/*
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* For each active handler, pass them a NULL
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* message to indicate that the other partition
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* died
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*/
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for (i = 0; i < VIO_MAX_SUBTYPES; i++) {
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if (vio_handler[i] != NULL)
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(*vio_handler[i])(NULL);
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}
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}
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int vio_setHandler(int subtype, vio_event_handler_t *beh)
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{
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subtype = subtype >> VIOMAJOR_SUBTYPE_SHIFT;
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if ((subtype < 0) || (subtype >= VIO_MAX_SUBTYPES))
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return -EINVAL;
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if (vio_handler[subtype] != NULL)
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return -EBUSY;
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vio_handler[subtype] = beh;
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return 0;
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}
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EXPORT_SYMBOL(vio_setHandler);
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int vio_clearHandler(int subtype)
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{
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subtype = subtype >> VIOMAJOR_SUBTYPE_SHIFT;
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if ((subtype < 0) || (subtype >= VIO_MAX_SUBTYPES))
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return -EINVAL;
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if (vio_handler[subtype] == NULL)
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return -EAGAIN;
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vio_handler[subtype] = NULL;
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return 0;
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}
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EXPORT_SYMBOL(vio_clearHandler);
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static void handleConfig(struct HvLpEvent *event)
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{
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if (!event)
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return;
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if (event->xFlags.xFunction == HvLpEvent_Function_Int) {
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printk(VIOPATH_KERN_WARN
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"unexpected config request from partition %d",
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event->xSourceLp);
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if ((event->xFlags.xFunction == HvLpEvent_Function_Int) &&
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(event->xFlags.xAckInd == HvLpEvent_AckInd_DoAck)) {
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event->xRc = HvLpEvent_Rc_InvalidSubtype;
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HvCallEvent_ackLpEvent(event);
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}
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return;
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}
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up((struct semaphore *)event->xCorrelationToken);
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}
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/*
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* Initialization of the hosting partition
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*/
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void vio_set_hostlp(void)
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{
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/*
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* If this has already been set then we DON'T want to either change
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* it or re-register the proc file system
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*/
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if (viopath_hostLp != HvLpIndexInvalid)
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return;
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/*
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* Figure out our hosting partition. This isn't allowed to change
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* while we're active
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*/
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viopath_ourLp = HvLpConfig_getLpIndex();
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viopath_hostLp = HvLpConfig_getHostingLpIndex(viopath_ourLp);
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if (viopath_hostLp != HvLpIndexInvalid)
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vio_setHandler(viomajorsubtype_config, handleConfig);
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}
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EXPORT_SYMBOL(vio_set_hostlp);
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static void vio_handleEvent(struct HvLpEvent *event, struct pt_regs *regs)
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{
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HvLpIndex remoteLp;
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int subtype = (event->xSubtype & VIOMAJOR_SUBTYPE_MASK)
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>> VIOMAJOR_SUBTYPE_SHIFT;
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if (event->xFlags.xFunction == HvLpEvent_Function_Int) {
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remoteLp = event->xSourceLp;
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/*
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* The isActive is checked because if the hosting partition
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* went down and came back up it would not be active but it
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* would have different source and target instances, in which
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* case we'd want to reset them. This case really protects
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* against an unauthorized active partition sending interrupts
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* or acks to this linux partition.
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*/
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if (viopathStatus[remoteLp].isActive
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&& (event->xSourceInstanceId !=
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viopathStatus[remoteLp].mTargetInst)) {
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printk(VIOPATH_KERN_WARN
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"message from invalid partition. "
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"int msg rcvd, source inst (%d) doesnt match (%d)\n",
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viopathStatus[remoteLp].mTargetInst,
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event->xSourceInstanceId);
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return;
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}
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if (viopathStatus[remoteLp].isActive
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&& (event->xTargetInstanceId !=
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viopathStatus[remoteLp].mSourceInst)) {
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printk(VIOPATH_KERN_WARN
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"message from invalid partition. "
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"int msg rcvd, target inst (%d) doesnt match (%d)\n",
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viopathStatus[remoteLp].mSourceInst,
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event->xTargetInstanceId);
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return;
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}
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} else {
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remoteLp = event->xTargetLp;
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if (event->xSourceInstanceId !=
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viopathStatus[remoteLp].mSourceInst) {
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printk(VIOPATH_KERN_WARN
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"message from invalid partition. "
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"ack msg rcvd, source inst (%d) doesnt match (%d)\n",
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viopathStatus[remoteLp].mSourceInst,
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event->xSourceInstanceId);
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return;
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}
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if (event->xTargetInstanceId !=
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viopathStatus[remoteLp].mTargetInst) {
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printk(VIOPATH_KERN_WARN
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"message from invalid partition. "
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"viopath: ack msg rcvd, target inst (%d) doesnt match (%d)\n",
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viopathStatus[remoteLp].mTargetInst,
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event->xTargetInstanceId);
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return;
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}
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}
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if (vio_handler[subtype] == NULL) {
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printk(VIOPATH_KERN_WARN
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"unexpected virtual io event subtype %d from partition %d\n",
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event->xSubtype, remoteLp);
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/* No handler. Ack if necessary */
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if ((event->xFlags.xFunction == HvLpEvent_Function_Int) &&
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(event->xFlags.xAckInd == HvLpEvent_AckInd_DoAck)) {
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event->xRc = HvLpEvent_Rc_InvalidSubtype;
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HvCallEvent_ackLpEvent(event);
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}
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return;
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}
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/* This innocuous little line is where all the real work happens */
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(*vio_handler[subtype])(event);
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}
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static void viopath_donealloc(void *parm, int number)
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{
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struct alloc_parms *parmsp = parm;
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parmsp->number = number;
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if (parmsp->used_wait_atomic)
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atomic_set(&parmsp->wait_atomic, 0);
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else
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up(&parmsp->sem);
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}
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static int allocateEvents(HvLpIndex remoteLp, int numEvents)
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{
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struct alloc_parms parms;
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if (system_state != SYSTEM_RUNNING) {
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parms.used_wait_atomic = 1;
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atomic_set(&parms.wait_atomic, 1);
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} else {
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parms.used_wait_atomic = 0;
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init_MUTEX_LOCKED(&parms.sem);
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}
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mf_allocate_lp_events(remoteLp, HvLpEvent_Type_VirtualIo, 250, /* It would be nice to put a real number here! */
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numEvents, &viopath_donealloc, &parms);
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if (system_state != SYSTEM_RUNNING) {
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while (atomic_read(&parms.wait_atomic))
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mb();
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} else
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down(&parms.sem);
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return parms.number;
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}
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int viopath_open(HvLpIndex remoteLp, int subtype, int numReq)
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{
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int i;
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unsigned long flags;
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int tempNumAllocated;
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if ((remoteLp >= HVMAXARCHITECTEDLPS) || (remoteLp == HvLpIndexInvalid))
|
|
return -EINVAL;
|
|
|
|
subtype = subtype >> VIOMAJOR_SUBTYPE_SHIFT;
|
|
if ((subtype < 0) || (subtype >= VIO_MAX_SUBTYPES))
|
|
return -EINVAL;
|
|
|
|
spin_lock_irqsave(&statuslock, flags);
|
|
|
|
if (!event_buffer_initialised) {
|
|
for (i = 0; i < VIO_MAX_SUBTYPES; i++)
|
|
atomic_set(&event_buffer_available[i], 1);
|
|
event_buffer_initialised = 1;
|
|
}
|
|
|
|
viopathStatus[remoteLp].users[subtype]++;
|
|
|
|
if (!viopathStatus[remoteLp].isOpen) {
|
|
viopathStatus[remoteLp].isOpen = 1;
|
|
HvCallEvent_openLpEventPath(remoteLp, HvLpEvent_Type_VirtualIo);
|
|
|
|
/*
|
|
* Don't hold the spinlock during an operation that
|
|
* can sleep.
|
|
*/
|
|
spin_unlock_irqrestore(&statuslock, flags);
|
|
tempNumAllocated = allocateEvents(remoteLp, 1);
|
|
spin_lock_irqsave(&statuslock, flags);
|
|
|
|
viopathStatus[remoteLp].numberAllocated += tempNumAllocated;
|
|
|
|
if (viopathStatus[remoteLp].numberAllocated == 0) {
|
|
HvCallEvent_closeLpEventPath(remoteLp,
|
|
HvLpEvent_Type_VirtualIo);
|
|
|
|
spin_unlock_irqrestore(&statuslock, flags);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
viopathStatus[remoteLp].mSourceInst =
|
|
HvCallEvent_getSourceLpInstanceId(remoteLp,
|
|
HvLpEvent_Type_VirtualIo);
|
|
viopathStatus[remoteLp].mTargetInst =
|
|
HvCallEvent_getTargetLpInstanceId(remoteLp,
|
|
HvLpEvent_Type_VirtualIo);
|
|
HvLpEvent_registerHandler(HvLpEvent_Type_VirtualIo,
|
|
&vio_handleEvent);
|
|
sendMonMsg(remoteLp);
|
|
printk(VIOPATH_KERN_INFO "opening connection to partition %d, "
|
|
"setting sinst %d, tinst %d\n",
|
|
remoteLp, viopathStatus[remoteLp].mSourceInst,
|
|
viopathStatus[remoteLp].mTargetInst);
|
|
}
|
|
|
|
spin_unlock_irqrestore(&statuslock, flags);
|
|
tempNumAllocated = allocateEvents(remoteLp, numReq);
|
|
spin_lock_irqsave(&statuslock, flags);
|
|
viopathStatus[remoteLp].numberAllocated += tempNumAllocated;
|
|
spin_unlock_irqrestore(&statuslock, flags);
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(viopath_open);
|
|
|
|
int viopath_close(HvLpIndex remoteLp, int subtype, int numReq)
|
|
{
|
|
unsigned long flags;
|
|
int i;
|
|
int numOpen;
|
|
struct alloc_parms parms;
|
|
|
|
if ((remoteLp >= HVMAXARCHITECTEDLPS) || (remoteLp == HvLpIndexInvalid))
|
|
return -EINVAL;
|
|
|
|
subtype = subtype >> VIOMAJOR_SUBTYPE_SHIFT;
|
|
if ((subtype < 0) || (subtype >= VIO_MAX_SUBTYPES))
|
|
return -EINVAL;
|
|
|
|
spin_lock_irqsave(&statuslock, flags);
|
|
/*
|
|
* If the viopath_close somehow gets called before a
|
|
* viopath_open it could decrement to -1 which is a non
|
|
* recoverable state so we'll prevent this from
|
|
* happening.
|
|
*/
|
|
if (viopathStatus[remoteLp].users[subtype] > 0)
|
|
viopathStatus[remoteLp].users[subtype]--;
|
|
|
|
spin_unlock_irqrestore(&statuslock, flags);
|
|
|
|
parms.used_wait_atomic = 0;
|
|
init_MUTEX_LOCKED(&parms.sem);
|
|
mf_deallocate_lp_events(remoteLp, HvLpEvent_Type_VirtualIo,
|
|
numReq, &viopath_donealloc, &parms);
|
|
down(&parms.sem);
|
|
|
|
spin_lock_irqsave(&statuslock, flags);
|
|
for (i = 0, numOpen = 0; i < VIO_MAX_SUBTYPES; i++)
|
|
numOpen += viopathStatus[remoteLp].users[i];
|
|
|
|
if ((viopathStatus[remoteLp].isOpen) && (numOpen == 0)) {
|
|
printk(VIOPATH_KERN_INFO "closing connection to partition %d",
|
|
remoteLp);
|
|
|
|
HvCallEvent_closeLpEventPath(remoteLp,
|
|
HvLpEvent_Type_VirtualIo);
|
|
viopathStatus[remoteLp].isOpen = 0;
|
|
viopathStatus[remoteLp].isActive = 0;
|
|
|
|
for (i = 0; i < VIO_MAX_SUBTYPES; i++)
|
|
atomic_set(&event_buffer_available[i], 0);
|
|
event_buffer_initialised = 0;
|
|
}
|
|
spin_unlock_irqrestore(&statuslock, flags);
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(viopath_close);
|
|
|
|
void *vio_get_event_buffer(int subtype)
|
|
{
|
|
subtype = subtype >> VIOMAJOR_SUBTYPE_SHIFT;
|
|
if ((subtype < 0) || (subtype >= VIO_MAX_SUBTYPES))
|
|
return NULL;
|
|
|
|
if (atomic_dec_if_positive(&event_buffer_available[subtype]) == 0)
|
|
return &event_buffer[subtype * 256];
|
|
else
|
|
return NULL;
|
|
}
|
|
EXPORT_SYMBOL(vio_get_event_buffer);
|
|
|
|
void vio_free_event_buffer(int subtype, void *buffer)
|
|
{
|
|
subtype = subtype >> VIOMAJOR_SUBTYPE_SHIFT;
|
|
if ((subtype < 0) || (subtype >= VIO_MAX_SUBTYPES)) {
|
|
printk(VIOPATH_KERN_WARN
|
|
"unexpected subtype %d freeing event buffer\n", subtype);
|
|
return;
|
|
}
|
|
|
|
if (atomic_read(&event_buffer_available[subtype]) != 0) {
|
|
printk(VIOPATH_KERN_WARN
|
|
"freeing unallocated event buffer, subtype %d\n",
|
|
subtype);
|
|
return;
|
|
}
|
|
|
|
if (buffer != &event_buffer[subtype * 256]) {
|
|
printk(VIOPATH_KERN_WARN
|
|
"freeing invalid event buffer, subtype %d\n", subtype);
|
|
}
|
|
|
|
atomic_set(&event_buffer_available[subtype], 1);
|
|
}
|
|
EXPORT_SYMBOL(vio_free_event_buffer);
|
|
|
|
static const struct vio_error_entry vio_no_error =
|
|
{ 0, 0, "Non-VIO Error" };
|
|
static const struct vio_error_entry vio_unknown_error =
|
|
{ 0, EIO, "Unknown Error" };
|
|
|
|
static const struct vio_error_entry vio_default_errors[] = {
|
|
{0x0001, EIO, "No Connection"},
|
|
{0x0002, EIO, "No Receiver"},
|
|
{0x0003, EIO, "No Buffer Available"},
|
|
{0x0004, EBADRQC, "Invalid Message Type"},
|
|
{0x0000, 0, NULL},
|
|
};
|
|
|
|
const struct vio_error_entry *vio_lookup_rc(
|
|
const struct vio_error_entry *local_table, u16 rc)
|
|
{
|
|
const struct vio_error_entry *cur;
|
|
|
|
if (!rc)
|
|
return &vio_no_error;
|
|
if (local_table)
|
|
for (cur = local_table; cur->rc; ++cur)
|
|
if (cur->rc == rc)
|
|
return cur;
|
|
for (cur = vio_default_errors; cur->rc; ++cur)
|
|
if (cur->rc == rc)
|
|
return cur;
|
|
return &vio_unknown_error;
|
|
}
|
|
EXPORT_SYMBOL(vio_lookup_rc);
|