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/*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License along with
* this program; if not, write to the Free Software Foundation, Inc., 59 Temple
* Place - Suite 330, Boston, MA 02111-1307 USA.
*/
#ifndef _ATS_H_
#define _ATS_H_
#include <xen/pci_regs.h>
struct pci_ats_dev {
struct list_head list;
u16 seg;
u8 bus;
u8 devfn;
u16 ats_queue_depth; /* ATS device invalidation queue depth */
};
#define ATS_REG_CAP 4
#define ATS_REG_CTL 6
#define ATS_QUEUE_DEPTH_MASK 0x1f
#define ATS_ENABLE (1<<15)
extern struct list_head ats_devices;
extern bool_t ats_enabled;
int enable_ats_device(int seg, int bus, int devfn);
void disable_ats_device(int seg, int bus, int devfn);
struct pci_ats_dev *get_ats_device(int seg, int bus, int devfn);
static inline int pci_ats_enabled(int seg, int bus, int devfn)
{
u32 value;
int pos;
pos = pci_find_ext_capability(seg, bus, devfn, PCI_EXT_CAP_ID_ATS);
BUG_ON(!pos);
value = pci_conf_read16(seg, bus, PCI_SLOT(devfn), PCI_FUNC(devfn),
pos + ATS_REG_CTL);
return value & ATS_ENABLE;
}
static inline int pci_ats_device(int seg, int bus, int devfn)
{
if ( !ats_enabled )
return 0;
return pci_find_ext_capability(seg, bus, devfn, PCI_EXT_CAP_ID_ATS);
}
#endif /* _ATS_H_ */
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