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 <cmetcalf@tilera.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
diff --git a/arch/tile/include/asm/compat.h b/arch/tile/include/asm/compat.h
index e133c53..b09292b 100644
--- a/arch/tile/include/asm/compat.h
+++ b/arch/tile/include/asm/compat.h
@@ -222,7 +222,7 @@
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)
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 <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 */
diff --git a/arch/tile/include/asm/processor.h b/arch/tile/include/asm/processor.h
index 96c50d2..09584e2 100644
--- a/arch/tile/include/asm/processor.h
+++ b/arch/tile/include/asm/processor.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 @@
unsigned long address; /* what address faulted? */
};
+#ifdef CONFIG_HARDWALL
+struct hardwall_info;
+#endif
struct thread_struct {
/* kernel stack pointer */
@@ -100,6 +103,12 @@
/* 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 @@
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 @@
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];