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https://github.com/xen-project/xen.git
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kfraser@localhost.localdomain
2e68ac5f97
Original patch from Jimi Xenidis <jimix@watson.ibm.com> Signed-off-by: Keir Fraser <keir@xensource.com>
137 lines
3.5 KiB
C
137 lines
3.5 KiB
C
/******************************************************************************
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* xc_tbuf.c
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*
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* API for manipulating and accessing trace buffer parameters
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*
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* Copyright (c) 2005, Rob Gardner
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*
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* Copyright 2006 Sun Microsystems, Inc. All rights reserved.
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* Use is subject to license terms.
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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, version 2 of the
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* License.
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*/
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#include "xc_private.h"
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static int tbuf_enable(int xc_handle, int enable)
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{
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DECLARE_SYSCTL;
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sysctl.cmd = XEN_SYSCTL_tbuf_op;
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sysctl.interface_version = XEN_SYSCTL_INTERFACE_VERSION;
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if (enable)
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sysctl.u.tbuf_op.cmd = XEN_SYSCTL_TBUFOP_enable;
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else
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sysctl.u.tbuf_op.cmd = XEN_SYSCTL_TBUFOP_disable;
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return xc_sysctl(xc_handle, &sysctl);
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}
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int xc_tbuf_set_size(int xc_handle, unsigned long size)
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{
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DECLARE_SYSCTL;
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sysctl.cmd = XEN_SYSCTL_tbuf_op;
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sysctl.interface_version = XEN_SYSCTL_INTERFACE_VERSION;
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sysctl.u.tbuf_op.cmd = XEN_SYSCTL_TBUFOP_set_size;
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sysctl.u.tbuf_op.size = size;
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return xc_sysctl(xc_handle, &sysctl);
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}
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int xc_tbuf_get_size(int xc_handle, unsigned long *size)
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{
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int rc;
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DECLARE_SYSCTL;
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sysctl.cmd = XEN_SYSCTL_tbuf_op;
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sysctl.interface_version = XEN_SYSCTL_INTERFACE_VERSION;
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sysctl.u.tbuf_op.cmd = XEN_SYSCTL_TBUFOP_get_info;
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rc = xc_sysctl(xc_handle, &sysctl);
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if (rc == 0)
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*size = sysctl.u.tbuf_op.size;
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return rc;
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}
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int xc_tbuf_enable(int xc_handle, unsigned long pages, unsigned long *mfn,
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unsigned long *size)
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{
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DECLARE_SYSCTL;
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int rc;
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/*
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* Ignore errors (at least for now) as we get an error if size is already
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* set (since trace buffers cannot be reallocated). If we really have no
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* buffers at all then tbuf_enable() will fail, so this is safe.
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*/
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(void)xc_tbuf_set_size(xc_handle, pages);
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if ( tbuf_enable(xc_handle, 1) != 0 )
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return -1;
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sysctl.cmd = XEN_SYSCTL_tbuf_op;
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sysctl.interface_version = XEN_SYSCTL_INTERFACE_VERSION;
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sysctl.u.tbuf_op.cmd = XEN_SYSCTL_TBUFOP_get_info;
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rc = xc_sysctl(xc_handle, &sysctl);
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if ( rc == 0 )
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{
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*size = sysctl.u.tbuf_op.size;
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*mfn = sysctl.u.tbuf_op.buffer_mfn;
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}
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return 0;
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}
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int xc_tbuf_disable(int xc_handle)
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{
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return tbuf_enable(xc_handle, 0);
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}
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int xc_tbuf_set_cpu_mask(int xc_handle, uint32_t mask)
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{
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DECLARE_SYSCTL;
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int ret = -1;
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uint64_t mask64 = mask;
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uint8_t bytemap[sizeof(mask64)];
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sysctl.cmd = XEN_SYSCTL_tbuf_op;
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sysctl.interface_version = XEN_SYSCTL_INTERFACE_VERSION;
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sysctl.u.tbuf_op.cmd = XEN_SYSCTL_TBUFOP_set_cpu_mask;
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bitmap_64_to_byte(bytemap, &mask64, sizeof (mask64));
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set_xen_guest_handle(sysctl.u.tbuf_op.cpu_mask.bitmap, bytemap);
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sysctl.u.tbuf_op.cpu_mask.nr_cpus = sizeof(bytemap) * 8;
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if ( lock_pages(&bytemap, sizeof(bytemap)) != 0 )
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{
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PERROR("Could not lock memory for Xen hypercall");
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goto out;
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}
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ret = do_sysctl(xc_handle, &sysctl);
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unlock_pages(&bytemap, sizeof(bytemap));
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out:
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return ret;
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}
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int xc_tbuf_set_evt_mask(int xc_handle, uint32_t mask)
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{
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DECLARE_SYSCTL;
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sysctl.cmd = XEN_SYSCTL_tbuf_op;
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sysctl.interface_version = XEN_SYSCTL_INTERFACE_VERSION;
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sysctl.u.tbuf_op.cmd = XEN_SYSCTL_TBUFOP_set_evt_mask;
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sysctl.u.tbuf_op.evt_mask = mask;
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return do_sysctl(xc_handle, &sysctl);
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}
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