Commit 9f9c0382 authored by Chris Metcalf's avatar Chris Metcalf

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: default avatarChris Metcalf <cmetcalf@tilera.com>
Acked-by: default avatarArnd Bergmann <arnd@arndb.de>
parent fb702b94
......@@ -310,6 +310,10 @@ config VMALLOC_RESERVE
hex
default 0x1000000
config HARDWALL
bool "Hardwall support to allow access to user dynamic network"
default y
endmenu # Tilera-specific configuration
menu "Bus options"
......
......@@ -222,7 +222,7 @@ struct compat_shmid64_ds {
static inline void __user *compat_ptr(compat_uptr_t uptr)
{
return (void __user *)(unsigned long)uptr;
return (void __user *)(long)(s32)uptr;
}
static inline compat_uptr_t ptr_to_compat(void __user *uptr)
......
/*
* 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 <linux/ioctl.h>
#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 */
......@@ -21,6 +21,7 @@
* NOTE: we don't include <linux/ptrace.h> or <linux/percpu.h> as one
* normally would, due to #include dependencies.
*/
#include <linux/types.h>
#include <asm/ptrace.h>
#include <asm/percpu.h>
......@@ -29,7 +30,6 @@
struct task_struct;
struct thread_struct;
struct list_head;
typedef struct {
unsigned long seg;
......@@ -74,6 +74,9 @@ struct async_tlb {
unsigned long address; /* what address faulted? */
};
#ifdef CONFIG_HARDWALL
struct hardwall_info;
#endif
struct thread_struct {
/* kernel stack pointer */
......@@ -100,6 +103,12 @@ struct thread_struct {
/* Any other miscellaneous processor state bits */
unsigned long proc_status;
#endif
#ifdef CONFIG_HARDWALL
/* Is this task tied to an activated hardwall? */
struct hardwall_info *hardwall;
/* Chains this task into the list at hardwall->list. */
struct list_head hardwall_list;
#endif
#if CHIP_HAS_TILE_DMA()
/* Async DMA TLB fault information */
struct async_tlb dma_async_tlb;
......@@ -194,8 +203,6 @@ static inline void release_thread(struct task_struct *dead_task)
extern int kernel_thread(int (*fn)(void *), void *arg, unsigned long flags);
/* Helper routines for setting home cache modes at exec() time. */
/*
* Return saved (kernel) PC of a blocked thread.
......@@ -240,6 +247,10 @@ struct siginfo;
extern void arch_coredump_signal(struct siginfo *, struct pt_regs *);
#define arch_coredump_signal arch_coredump_signal
/* Info on this processor (see fs/proc/cpuinfo.c) */
struct seq_operations;
extern const struct seq_operations cpuinfo_op;
/* Provide information about the chip model. */
extern char chip_model[64];
......
......@@ -8,6 +8,7 @@ obj-y := backtrace.o entry.o init_task.o irq.o messaging.o \
setup.o signal.o single_step.o stack.o sys.o time.o traps.o \
intvec_$(BITS).o regs_$(BITS).o tile-desc_$(BITS).o
obj-$(CONFIG_HARDWALL) += hardwall.o
obj-$(CONFIG_TILEGX) += futex_64.o
obj-$(CONFIG_COMPAT) += compat.o compat_signal.o
obj-$(CONFIG_SMP) += smpboot.o smp.o tlb.o
......
This diff is collapsed.
......@@ -17,9 +17,9 @@
#include <linux/linkage.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/unistd.h>
#include <asm/ptrace.h>
#include <asm/thread_info.h>
#include <asm/unistd.h>
#include <asm/irqflags.h>
#include <asm/atomic.h>
#include <asm/asm-offsets.h>
......@@ -32,7 +32,7 @@
# error "No support for kernel preemption currently"
#endif
#if INT_INTCTRL_1 < 32 || INT_INTCTL_1 >= 48
#if INT_INTCTRL_1 < 32 || INT_INTCTRL_1 >= 48
# error INT_INTCTRL_1 coded to set high interrupt mask
#endif
......@@ -1941,7 +1941,9 @@ int_unalign:
#define op_handle_perf_interrupt bad_intr
#define op_handle_aux_perf_interrupt bad_intr
#ifndef CONFIG_HARDWALL
#define do_hardwall_trap bad_intr
#endif
int_hand INT_ITLB_MISS, ITLB_MISS, \
do_page_fault, handle_interrupt_no_single_step
......
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