From 9f9c0382cda2334b35b40b00f4ed9d6f89f37a7b Mon Sep 17 00:00:00 2001 From: Chris Metcalf Date: Fri, 25 Jun 2010 17:00:56 -0400 Subject: arch/tile: Add driver to enable access to the user dynamic network. 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 Acked-by: Arnd Bergmann --- arch/tile/include/asm/hardwall.h | 56 ++++++++++++++++++++++++++++++++++++++++ 1 file changed, 56 insertions(+) create mode 100644 arch/tile/include/asm/hardwall.h (limited to 'arch/tile/include/asm/hardwall.h') diff --git a/arch/tile/include/asm/hardwall.h b/arch/tile/include/asm/hardwall.h new file mode 100644 index 0000000..0bed3ec --- /dev/null +++ b/arch/tile/include/asm/hardwall.h @@ -0,0 +1,56 @@ +/* + * Copyright 2010 Tilera Corporation. All Rights Reserved. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation, version 2. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or + * NON INFRINGEMENT. See the GNU General Public License for + * more details. + * + * Provide methods for the HARDWALL_FILE for accessing the UDN. + */ + +#ifndef _ASM_TILE_HARDWALL_H +#define _ASM_TILE_HARDWALL_H + +#include + +#define HARDWALL_IOCTL_BASE 0xa2 + +/* + * The HARDWALL_CREATE() ioctl is a macro with a "size" argument. + * The resulting ioctl value is passed to the kernel in conjunction + * with a pointer to a little-endian bitmask of cpus, which must be + * physically in a rectangular configuration on the chip. + * The "size" is the number of bytes of cpu mask data. + */ +#define _HARDWALL_CREATE 1 +#define HARDWALL_CREATE(size) \ + _IOC(_IOC_READ, HARDWALL_IOCTL_BASE, _HARDWALL_CREATE, (size)) + +#define _HARDWALL_ACTIVATE 2 +#define HARDWALL_ACTIVATE \ + _IO(HARDWALL_IOCTL_BASE, _HARDWALL_ACTIVATE) + +#define _HARDWALL_DEACTIVATE 3 +#define HARDWALL_DEACTIVATE \ + _IO(HARDWALL_IOCTL_BASE, _HARDWALL_DEACTIVATE) + +#ifndef __KERNEL__ + +/* This is the canonical name expected by userspace. */ +#define HARDWALL_FILE "/dev/hardwall" + +#else + +/* Hook for /proc/tile/hardwall. */ +struct seq_file; +int proc_tile_hardwall_show(struct seq_file *sf, void *v); + +#endif + +#endif /* _ASM_TILE_HARDWALL_H */ -- cgit v1.1