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This network (the "UDN") connects all the cpus on the chip in a wormhole-routed dynamic network. Subrectangles of the chip can be allocated by a "create" ioctl on /dev/hardwall, and then to access the UDN in that rectangle, tasks must perform an "activate" ioctl on that same file object after affinitizing themselves to a single cpu in the region. Sending a wormhole-routed message that tries to leave that subrectangle causes all activated tasks to receive a SIGILL (just as they would if they tried to access the UDN without first activating themselves to a hardwall rectangle). The original submission of this code to LKML had the driver instantiated under /proc/tile/hardwall. Now we just use a character device for this, conventionally /dev/hardwall. Some futures planning for the TILE-Gx chip suggests that we may want to have other types of devices that share the general model of "bind a task to a cpu, then 'activate' a file descriptor on a pseudo-device that gives access to some hardware resource". As such, we are using a device rather than, for example, a syscall, to set up and activate this code. As part of this change, the compat_ptr() declaration was fixed and used to pass the compat_ioctl argument to the normal ioctl. So far we limit compat code to 2GB, so the difference between zero-extend and sign-extend (the latter being correct, eventually) had been overlooked. Signed-off-by: Chris Metcalf <cmetcalf@tilera.com> Acked-by: Arnd Bergmann <arnd@arndb.de>
56 lines
1.6 KiB
C
56 lines
1.6 KiB
C
/*
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* Copyright 2010 Tilera Corporation. All Rights Reserved.
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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
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* as published by the Free Software Foundation, version 2.
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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, GOOD TITLE or
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* NON INFRINGEMENT. See the GNU General Public License for
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* more details.
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*
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* Provide methods for the HARDWALL_FILE for accessing the UDN.
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*/
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#ifndef _ASM_TILE_HARDWALL_H
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#define _ASM_TILE_HARDWALL_H
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#include <linux/ioctl.h>
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#define HARDWALL_IOCTL_BASE 0xa2
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/*
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* The HARDWALL_CREATE() ioctl is a macro with a "size" argument.
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* The resulting ioctl value is passed to the kernel in conjunction
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* with a pointer to a little-endian bitmask of cpus, which must be
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* physically in a rectangular configuration on the chip.
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* The "size" is the number of bytes of cpu mask data.
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*/
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#define _HARDWALL_CREATE 1
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#define HARDWALL_CREATE(size) \
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_IOC(_IOC_READ, HARDWALL_IOCTL_BASE, _HARDWALL_CREATE, (size))
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#define _HARDWALL_ACTIVATE 2
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#define HARDWALL_ACTIVATE \
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_IO(HARDWALL_IOCTL_BASE, _HARDWALL_ACTIVATE)
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#define _HARDWALL_DEACTIVATE 3
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#define HARDWALL_DEACTIVATE \
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_IO(HARDWALL_IOCTL_BASE, _HARDWALL_DEACTIVATE)
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#ifndef __KERNEL__
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/* This is the canonical name expected by userspace. */
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#define HARDWALL_FILE "/dev/hardwall"
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#else
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/* Hook for /proc/tile/hardwall. */
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struct seq_file;
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int proc_tile_hardwall_show(struct seq_file *sf, void *v);
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#endif
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#endif /* _ASM_TILE_HARDWALL_H */
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