f133ecca9c
This change introduces a few of the less controversial /proc and /proc/sys interfaces for tile, along with sysfs attributes for various things that were originally proposed as /proc/tile files. It also adjusts the "hardwall" proc API. Arnd Bergmann reviewed the initial arch/tile submission, which included a complete set of all the /proc/tile and /proc/sys/tile knobs that we had added in a somewhat ad hoc way during initial development, and provided feedback on where most of them should go. One knob turned out to be similar enough to the existing /proc/sys/debug/exception-trace that it was re-implemented to use that model instead. Another knob was /proc/tile/grid, which reported the "grid" dimensions of a tile chip (e.g. 8x8 processors = 64-core chip). Arnd suggested looking at sysfs for that, so this change moves that information to a pair of sysfs attributes (chip_width and chip_height) in the /sys/devices/system/cpu directory. We also put the "chip_serial" and "chip_revision" information from our old /proc/tile/board file as attributes in /sys/devices/system/cpu. Other information collected via hypervisor APIs is now placed in /sys/hypervisor. We create a /sys/hypervisor/type file (holding the constant string "tilera") to be parallel with the Xen use of /sys/hypervisor/type holding "xen". We create three top-level files, "version" (the hypervisor's own version), "config_version" (the version of the configuration file), and "hvconfig" (the contents of the configuration file). The remaining information from our old /proc/tile/board and /proc/tile/switch files becomes an attribute group appearing under /sys/hypervisor/board/. Finally, after some feedback from Arnd Bergmann for the previous version of this patch, the /proc/tile/hardwall file is split up into two conceptual parts. First, a directory /proc/tile/hardwall/ which contains one file per active hardwall, each file named after the hardwall's ID and holding a cpulist that says which cpus are enclosed by the hardwall. Second, a /proc/PID file "hardwall" that is either empty (for non-hardwall-using processes) or contains the hardwall ID. Finally, this change pushes the /proc/sys/tile/unaligned_fixup/ directory, with knobs controlling the kernel code for handling the fixup of unaligned exceptions. Reviewed-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
65 lines
1.9 KiB
C
65 lines
1.9 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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#define _HARDWALL_GET_ID 4
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#define HARDWALL_GET_ID \
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_IO(HARDWALL_IOCTL_BASE, _HARDWALL_GET_ID)
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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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/* /proc hooks for hardwall. */
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struct proc_dir_entry;
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#ifdef CONFIG_HARDWALL
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void proc_tile_hardwall_init(struct proc_dir_entry *root);
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int proc_pid_hardwall(struct task_struct *task, char *buffer);
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#else
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static inline void proc_tile_hardwall_init(struct proc_dir_entry *root) {}
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#endif
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#endif
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#endif /* _ASM_TILE_HARDWALL_H */
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