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https://github.com/xen-project/xen.git
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Jiqian Chen
b93e5981d2
On PVH dom0, when passthrough a device to domU, QEMU and xl tools want to use gsi number to do pirq mapping, see QEMU code xen_pt_realize->xc_physdev_map_pirq, and xl code pci_add_dm_done->xc_physdev_map_pirq, but in current codes, the gsi number is got from file /sys/bus/pci/devices/<sbdf>/irq, that is wrong, because irq is not equal with gsi, they are in different spaces, so pirq mapping fails. And in current codes, there is no method to get gsi for userspace. For above purpose, add new function to get gsi, and the corresponding ioctl is implemented on linux kernel side. Signed-off-by: Jiqian Chen <Jiqian.Chen@amd.com> Signed-off-by: Huang Rui <ray.huang@amd.com> Signed-off-by: Chen Jiqian <Jiqian.Chen@amd.com> Reviewed-by: Anthony PERARD <anthony.perard@vates.tech>
81 lines
2.0 KiB
C
81 lines
2.0 KiB
C
/******************************************************************************
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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 library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation;
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* version 2.1 of the License.
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*
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* This library is distributed in the hope that it will be useful,
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* but 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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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "xc_private.h"
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#include <unistd.h>
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#include <fcntl.h>
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#include <malloc.h>
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/* Optionally flush file to disk and discard page cache */
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void discard_file_cache(xc_interface *xch, int fd, int flush)
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{
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off_t cur = 0;
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int saved_errno = errno;
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if ( flush && (fsync(fd) < 0) )
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{
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/*PERROR("Failed to flush file: %s", strerror(errno));*/
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goto out;
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}
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/*
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* Calculate last page boundry of amount written so far
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* unless we are flushing in which case entire cache
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* is discarded.
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*/
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if ( !flush )
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{
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if ( ( cur = lseek(fd, 0, SEEK_CUR)) == (off_t)-1 )
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cur = 0;
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cur &= ~(PAGE_SIZE - 1);
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}
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/* Discard from the buffer cache. */
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if ( posix_fadvise(fd, 0, cur, POSIX_FADV_DONTNEED) < 0 )
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{
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/*PERROR("Failed to discard cache: %s", strerror(errno));*/
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goto out;
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}
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out:
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errno = saved_errno;
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}
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void *xc_memalign(xc_interface *xch, size_t alignment, size_t size)
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{
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return valloc(size);
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}
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int xc_pcidev_get_gsi(xc_interface *xch, uint32_t sbdf)
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{
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errno = ENOSYS;
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return -1;
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}
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/*
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* Local variables:
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* mode: C
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* c-file-style: "BSD"
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* c-basic-offset: 4
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* tab-width: 4
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* indent-tabs-mode: nil
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* End:
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*/
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