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When running on Xen, it's possible that a suspend request to the hypervisor fails (return from HYPERVISOR_suspend different than 0). This means that the suspend hasn't succeed, and the resume procedure needs to properly handle this case. First of all, when such situation happens there's no need to reset the vector callback, hypercall page, shared info, event channels or grant table, because it's state is preserved. Also, the PV drivers don't need to be reset to the initial state, since the connection with the backed has not been interrupted. Submitted by: Liuyingdong <liuyingdong@huawei.com> Reviewed by: royger MFC after: 2 weeks Differential revision: https://reviews.freebsd.org/D9635
148 lines
3.8 KiB
C
148 lines
3.8 KiB
C
/******************************************************************************
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* xen/xen-os.h
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*
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* Random collection of macros and definition
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*
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* Copyright (c) 2003, 2004 Keir Fraser (on behalf of the Xen team)
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* All rights reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to
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* deal in the Software without restriction, including without limitation the
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* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
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* sell copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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* DEALINGS IN THE SOFTWARE.
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*
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* $FreeBSD$
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*/
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#ifndef _XEN_XEN_OS_H_
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#define _XEN_XEN_OS_H_
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#if !defined(__XEN_INTERFACE_VERSION__)
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#define __XEN_INTERFACE_VERSION__ 0x00030208
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#endif
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#define GRANT_REF_INVALID 0xffffffff
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#ifdef LOCORE
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#define __ASSEMBLY__
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#endif
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#include <machine/xen/xen-os.h>
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#include <xen/interface/xen.h>
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/* Everything below this point is not included by assembler (.S) files. */
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#ifndef __ASSEMBLY__
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extern shared_info_t *HYPERVISOR_shared_info;
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extern start_info_t *HYPERVISOR_start_info;
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/* XXX: we need to get rid of this and use HYPERVISOR_start_info directly */
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extern char *console_page;
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extern int xen_disable_pv_disks;
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extern int xen_disable_pv_nics;
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extern bool xen_suspend_cancelled;
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enum xen_domain_type {
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XEN_NATIVE, /* running on bare hardware */
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XEN_PV_DOMAIN, /* running in a PV domain */
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XEN_HVM_DOMAIN, /* running in a Xen hvm domain */
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};
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extern enum xen_domain_type xen_domain_type;
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static inline int
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xen_domain(void)
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{
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return (xen_domain_type != XEN_NATIVE);
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}
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static inline int
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xen_pv_domain(void)
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{
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return (xen_domain_type == XEN_PV_DOMAIN);
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}
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static inline int
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xen_hvm_domain(void)
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{
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return (xen_domain_type == XEN_HVM_DOMAIN);
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}
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static inline bool
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xen_initial_domain(void)
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{
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return (xen_domain() && HYPERVISOR_start_info != NULL &&
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(HYPERVISOR_start_info->flags & SIF_INITDOMAIN) != 0);
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}
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/*
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* Based on ofed/include/linux/bitops.h
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*
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* Those helpers are prefixed by xen_ because xen-os.h is widely included
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* and we don't want the other drivers using them.
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*
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*/
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#define NBPL (NBBY * sizeof(long))
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static inline bool
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xen_test_bit(int bit, volatile long *addr)
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{
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unsigned long mask = 1UL << (bit % NBPL);
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return !!(atomic_load_acq_long(&addr[bit / NBPL]) & mask);
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}
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static inline void
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xen_set_bit(int bit, volatile long *addr)
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{
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atomic_set_long(&addr[bit / NBPL], 1UL << (bit % NBPL));
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}
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static inline void
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xen_clear_bit(int bit, volatile long *addr)
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{
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atomic_clear_long(&addr[bit / NBPL], 1UL << (bit % NBPL));
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}
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#undef NBPL
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/*
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* Functions to allocate/free unused memory in order
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* to map memory from other domains.
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*/
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struct resource *xenmem_alloc(device_t dev, int *res_id, size_t size);
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int xenmem_free(device_t dev, int res_id, struct resource *res);
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/* Debug/emergency function, prints directly to hypervisor console */
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void xc_printf(const char *, ...) __printflike(1, 2);
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#ifndef xen_mb
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#define xen_mb() mb()
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#endif
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#ifndef xen_rmb
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#define xen_rmb() rmb()
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#endif
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#ifndef xen_wmb
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#define xen_wmb() wmb()
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#endif
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#endif /* !__ASSEMBLY__ */
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#endif /* _XEN_XEN_OS_H_ */
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