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b8ace0833f
The hardwall drain code was not properly implemented for tilegx,
just tilepro, so you couldn't reliably restart an application that
made use of the udn.
In addition, the code was only applicable to the udn (user dynamic
network). On tilegx there is a second user network that is available
(the "idn"), and there is support for having I/O shims deliver
user-level interrupts to applications ("ipi") which functions in a
very similar way to the inter-core permissions used for udn/idn.
So this change also generalizes the code from supporting just the udn
to supports udn/idn/ipi on tilegx.
By default we now use /dev/hardwall/{udn,idn,ipi} with separate
minor numbers for the three devices.
Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
62 lines
1.9 KiB
C
62 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 access control of per-cpu resources like
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* UDN, IDN, or IPI.
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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 <arch/chip.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 standard kernel bitmask of cpus.
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* For network resources (UDN or IDN) the bitmask must physically
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* represent 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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#ifdef __KERNEL__
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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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