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linux/drivers/misc/sgi-gru/grufile.c
Arnd Bergmann 6038f373a3 llseek: automatically add .llseek fop 
All file_operations should get a .llseek operation so we can make
nonseekable_open the default for future file operations without a
.llseek pointer.

The three cases that we can automatically detect are no_llseek, seq_lseek
and default_llseek. For cases where we can we can automatically prove that
the file offset is always ignored, we use noop_llseek, which maintains
the current behavior of not returning an error from a seek.

New drivers should normally not use noop_llseek but instead use no_llseek
and call nonseekable_open at open time.  Existing drivers can be converted
to do the same when the maintainer knows for certain that no user code
relies on calling seek on the device file.

The generated code is often incorrectly indented and right now contains
comments that clarify for each added line why a specific variant was
chosen. In the version that gets submitted upstream, the comments will
be gone and I will manually fix the indentation, because there does not
seem to be a way to do that using coccinelle.

Some amount of new code is currently sitting in linux-next that should get
the same modifications, which I will do at the end of the merge window.

Many thanks to Julia Lawall for helping me learn to write a semantic
patch that does all this.

===== begin semantic patch =====
// This adds an llseek= method to all file operations,
// as a preparation for making no_llseek the default.
//
// The rules are
// - use no_llseek explicitly if we do nonseekable_open
// - use seq_lseek for sequential files
// - use default_llseek if we know we access f_pos
// - use noop_llseek if we know we don't access f_pos,
//   but we still want to allow users to call lseek
//
@ open1 exists @
identifier nested_open;
@@
nested_open(...)
{
<+...
nonseekable_open(...)
...+>
}

@ open exists@
identifier open_f;
identifier i, f;
identifier open1.nested_open;
@@
int open_f(struct inode *i, struct file *f)
{
<+...
(
nonseekable_open(...)
|
nested_open(...)
)
...+>
}

@ read disable optional_qualifier exists @
identifier read_f;
identifier f, p, s, off;
type ssize_t, size_t, loff_t;
expression E;
identifier func;
@@
ssize_t read_f(struct file *f, char *p, size_t s, loff_t *off)
{
<+...
(
   *off = E
|
   *off += E
|
   func(..., off, ...)
|
   E = *off
)
...+>
}

@ read_no_fpos disable optional_qualifier exists @
identifier read_f;
identifier f, p, s, off;
type ssize_t, size_t, loff_t;
@@
ssize_t read_f(struct file *f, char *p, size_t s, loff_t *off)
{
... when != off
}

@ write @
identifier write_f;
identifier f, p, s, off;
type ssize_t, size_t, loff_t;
expression E;
identifier func;
@@
ssize_t write_f(struct file *f, const char *p, size_t s, loff_t *off)
{
<+...
(
  *off = E
|
  *off += E
|
  func(..., off, ...)
|
  E = *off
)
...+>
}

@ write_no_fpos @
identifier write_f;
identifier f, p, s, off;
type ssize_t, size_t, loff_t;
@@
ssize_t write_f(struct file *f, const char *p, size_t s, loff_t *off)
{
... when != off
}

@ fops0 @
identifier fops;
@@
struct file_operations fops = {
 ...
};

@ has_llseek depends on fops0 @
identifier fops0.fops;
identifier llseek_f;
@@
struct file_operations fops = {
...
 .llseek = llseek_f,
...
};

@ has_read depends on fops0 @
identifier fops0.fops;
identifier read_f;
@@
struct file_operations fops = {
...
 .read = read_f,
...
};

@ has_write depends on fops0 @
identifier fops0.fops;
identifier write_f;
@@
struct file_operations fops = {
...
 .write = write_f,
...
};

@ has_open depends on fops0 @
identifier fops0.fops;
identifier open_f;
@@
struct file_operations fops = {
...
 .open = open_f,
...
};

// use no_llseek if we call nonseekable_open
////////////////////////////////////////////
@ nonseekable1 depends on !has_llseek && has_open @
identifier fops0.fops;
identifier nso ~= "nonseekable_open";
@@
struct file_operations fops = {
...  .open = nso, ...
+.llseek = no_llseek, /* nonseekable */
};

@ nonseekable2 depends on !has_llseek @
identifier fops0.fops;
identifier open.open_f;
@@
struct file_operations fops = {
...  .open = open_f, ...
+.llseek = no_llseek, /* open uses nonseekable */
};

// use seq_lseek for sequential files
/////////////////////////////////////
@ seq depends on !has_llseek @
identifier fops0.fops;
identifier sr ~= "seq_read";
@@
struct file_operations fops = {
...  .read = sr, ...
+.llseek = seq_lseek, /* we have seq_read */
};

// use default_llseek if there is a readdir
///////////////////////////////////////////
@ fops1 depends on !has_llseek && !nonseekable1 && !nonseekable2 && !seq @
identifier fops0.fops;
identifier readdir_e;
@@
// any other fop is used that changes pos
struct file_operations fops = {
... .readdir = readdir_e, ...
+.llseek = default_llseek, /* readdir is present */
};

// use default_llseek if at least one of read/write touches f_pos
/////////////////////////////////////////////////////////////////
@ fops2 depends on !fops1 && !has_llseek && !nonseekable1 && !nonseekable2 && !seq @
identifier fops0.fops;
identifier read.read_f;
@@
// read fops use offset
struct file_operations fops = {
... .read = read_f, ...
+.llseek = default_llseek, /* read accesses f_pos */
};

@ fops3 depends on !fops1 && !fops2 && !has_llseek && !nonseekable1 && !nonseekable2 && !seq @
identifier fops0.fops;
identifier write.write_f;
@@
// write fops use offset
struct file_operations fops = {
... .write = write_f, ...
+	.llseek = default_llseek, /* write accesses f_pos */
};

// Use noop_llseek if neither read nor write accesses f_pos
///////////////////////////////////////////////////////////

@ fops4 depends on !fops1 && !fops2 && !fops3 && !has_llseek && !nonseekable1 && !nonseekable2 && !seq @
identifier fops0.fops;
identifier read_no_fpos.read_f;
identifier write_no_fpos.write_f;
@@
// write fops use offset
struct file_operations fops = {
...
 .write = write_f,
 .read = read_f,
...
+.llseek = noop_llseek, /* read and write both use no f_pos */
};

@ depends on has_write && !has_read && !fops1 && !fops2 && !has_llseek && !nonseekable1 && !nonseekable2 && !seq @
identifier fops0.fops;
identifier write_no_fpos.write_f;
@@
struct file_operations fops = {
... .write = write_f, ...
+.llseek = noop_llseek, /* write uses no f_pos */
};

@ depends on has_read && !has_write && !fops1 && !fops2 && !has_llseek && !nonseekable1 && !nonseekable2 && !seq @
identifier fops0.fops;
identifier read_no_fpos.read_f;
@@
struct file_operations fops = {
... .read = read_f, ...
+.llseek = noop_llseek, /* read uses no f_pos */
};

@ depends on !has_read && !has_write && !fops1 && !fops2 && !has_llseek && !nonseekable1 && !nonseekable2 && !seq @
identifier fops0.fops;
@@
struct file_operations fops = {
...
+.llseek = noop_llseek, /* no read or write fn */
};
===== End semantic patch =====

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Cc: Julia Lawall <julia@diku.dk>
Cc: Christoph Hellwig <hch@infradead.org>
2010-10-15 15:53:27 +02:00

618 lines
15 KiB
C
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/*
* SN Platform GRU Driver
*
* FILE OPERATIONS & DRIVER INITIALIZATION
*
* This file supports the user system call for file open, close, mmap, etc.
* This also incudes the driver initialization code.
*
* Copyright (c) 2008 Silicon Graphics, Inc. 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; either version 2 of the License, or
* (at your option) any later version.
*
* 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. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/slab.h>
#include <linux/mm.h>
#include <linux/io.h>
#include <linux/spinlock.h>
#include <linux/device.h>
#include <linux/miscdevice.h>
#include <linux/interrupt.h>
#include <linux/proc_fs.h>
#include <linux/uaccess.h>
#ifdef CONFIG_X86_64
#include <asm/uv/uv_irq.h>
#endif
#include <asm/uv/uv.h>
#include "gru.h"
#include "grulib.h"
#include "grutables.h"
#include <asm/uv/uv_hub.h>
#include <asm/uv/uv_mmrs.h>
struct gru_blade_state *gru_base[GRU_MAX_BLADES] __read_mostly;
unsigned long gru_start_paddr __read_mostly;
void *gru_start_vaddr __read_mostly;
unsigned long gru_end_paddr __read_mostly;
unsigned int gru_max_gids __read_mostly;
struct gru_stats_s gru_stats;
/* Guaranteed user available resources on each node */
static int max_user_cbrs, max_user_dsr_bytes;
static struct miscdevice gru_miscdev;
/*
* gru_vma_close
*
* Called when unmapping a device mapping. Frees all gru resources
* and tables belonging to the vma.
*/
static void gru_vma_close(struct vm_area_struct *vma)
{
struct gru_vma_data *vdata;
struct gru_thread_state *gts;
struct list_head *entry, *next;
if (!vma->vm_private_data)
return;
vdata = vma->vm_private_data;
vma->vm_private_data = NULL;
gru_dbg(grudev, "vma %p, file %p, vdata %p\n", vma, vma->vm_file,
vdata);
list_for_each_safe(entry, next, &vdata->vd_head) {
gts =
list_entry(entry, struct gru_thread_state, ts_next);
list_del(&gts->ts_next);
mutex_lock(&gts->ts_ctxlock);
if (gts->ts_gru)
gru_unload_context(gts, 0);
mutex_unlock(&gts->ts_ctxlock);
gts_drop(gts);
}
kfree(vdata);
STAT(vdata_free);
}
/*
* gru_file_mmap
*
* Called when mmapping the device. Initializes the vma with a fault handler
* and private data structure necessary to allocate, track, and free the
* underlying pages.
*/
static int gru_file_mmap(struct file *file, struct vm_area_struct *vma)
{
if ((vma->vm_flags & (VM_SHARED | VM_WRITE)) != (VM_SHARED | VM_WRITE))
return -EPERM;
if (vma->vm_start & (GRU_GSEG_PAGESIZE - 1) ||
vma->vm_end & (GRU_GSEG_PAGESIZE - 1))
return -EINVAL;
vma->vm_flags |=
(VM_IO | VM_DONTCOPY | VM_LOCKED | VM_DONTEXPAND | VM_PFNMAP |
VM_RESERVED);
vma->vm_page_prot = PAGE_SHARED;
vma->vm_ops = &gru_vm_ops;
vma->vm_private_data = gru_alloc_vma_data(vma, 0);
if (!vma->vm_private_data)
return -ENOMEM;
gru_dbg(grudev, "file %p, vaddr 0x%lx, vma %p, vdata %p\n",
file, vma->vm_start, vma, vma->vm_private_data);
return 0;
}
/*
* Create a new GRU context
*/
static int gru_create_new_context(unsigned long arg)
{
struct gru_create_context_req req;
struct vm_area_struct *vma;
struct gru_vma_data *vdata;
int ret = -EINVAL;
if (copy_from_user(&req, (void __user *)arg, sizeof(req)))
return -EFAULT;
if (req.data_segment_bytes > max_user_dsr_bytes)
return -EINVAL;
if (req.control_blocks > max_user_cbrs || !req.maximum_thread_count)
return -EINVAL;
if (!(req.options & GRU_OPT_MISS_MASK))
req.options |= GRU_OPT_MISS_FMM_INTR;
down_write(&current->mm->mmap_sem);
vma = gru_find_vma(req.gseg);
if (vma) {
vdata = vma->vm_private_data;
vdata->vd_user_options = req.options;
vdata->vd_dsr_au_count =
GRU_DS_BYTES_TO_AU(req.data_segment_bytes);
vdata->vd_cbr_au_count = GRU_CB_COUNT_TO_AU(req.control_blocks);
vdata->vd_tlb_preload_count = req.tlb_preload_count;
ret = 0;
}
up_write(&current->mm->mmap_sem);
return ret;
}
/*
* Get GRU configuration info (temp - for emulator testing)
*/
static long gru_get_config_info(unsigned long arg)
{
struct gru_config_info info;
int nodesperblade;
if (num_online_nodes() > 1 &&
(uv_node_to_blade_id(1) == uv_node_to_blade_id(0)))
nodesperblade = 2;
else
nodesperblade = 1;
info.cpus = num_online_cpus();
info.nodes = num_online_nodes();
info.blades = info.nodes / nodesperblade;
info.chiplets = GRU_CHIPLETS_PER_BLADE * info.blades;
if (copy_to_user((void __user *)arg, &info, sizeof(info)))
return -EFAULT;
return 0;
}
/*
* gru_file_unlocked_ioctl
*
* Called to update file attributes via IOCTL calls.
*/
static long gru_file_unlocked_ioctl(struct file *file, unsigned int req,
unsigned long arg)
{
int err = -EBADRQC;
gru_dbg(grudev, "file %p, req 0x%x, 0x%lx\n", file, req, arg);
switch (req) {
case GRU_CREATE_CONTEXT:
err = gru_create_new_context(arg);
break;
case GRU_SET_CONTEXT_OPTION:
err = gru_set_context_option(arg);
break;
case GRU_USER_GET_EXCEPTION_DETAIL:
err = gru_get_exception_detail(arg);
break;
case GRU_USER_UNLOAD_CONTEXT:
err = gru_user_unload_context(arg);
break;
case GRU_USER_FLUSH_TLB:
err = gru_user_flush_tlb(arg);
break;
case GRU_USER_CALL_OS:
err = gru_handle_user_call_os(arg);
break;
case GRU_GET_GSEG_STATISTICS:
err = gru_get_gseg_statistics(arg);
break;
case GRU_KTEST:
err = gru_ktest(arg);
break;
case GRU_GET_CONFIG_INFO:
err = gru_get_config_info(arg);
break;
case GRU_DUMP_CHIPLET_STATE:
err = gru_dump_chiplet_request(arg);
break;
}
return err;
}
/*
* Called at init time to build tables for all GRUs that are present in the
* system.
*/
static void gru_init_chiplet(struct gru_state *gru, unsigned long paddr,
void *vaddr, int blade_id, int chiplet_id)
{
spin_lock_init(&gru->gs_lock);
spin_lock_init(&gru->gs_asid_lock);
gru->gs_gru_base_paddr = paddr;
gru->gs_gru_base_vaddr = vaddr;
gru->gs_gid = blade_id * GRU_CHIPLETS_PER_BLADE + chiplet_id;
gru->gs_blade = gru_base[blade_id];
gru->gs_blade_id = blade_id;
gru->gs_chiplet_id = chiplet_id;
gru->gs_cbr_map = (GRU_CBR_AU == 64) ? ~0 : (1UL << GRU_CBR_AU) - 1;
gru->gs_dsr_map = (1UL << GRU_DSR_AU) - 1;
gru->gs_asid_limit = MAX_ASID;
gru_tgh_flush_init(gru);
if (gru->gs_gid >= gru_max_gids)
gru_max_gids = gru->gs_gid + 1;
gru_dbg(grudev, "bid %d, gid %d, vaddr %p (0x%lx)\n",
blade_id, gru->gs_gid, gru->gs_gru_base_vaddr,
gru->gs_gru_base_paddr);
}
static int gru_init_tables(unsigned long gru_base_paddr, void *gru_base_vaddr)
{
int pnode, nid, bid, chip;
int cbrs, dsrbytes, n;
int order = get_order(sizeof(struct gru_blade_state));
struct page *page;
struct gru_state *gru;
unsigned long paddr;
void *vaddr;
max_user_cbrs = GRU_NUM_CB;
max_user_dsr_bytes = GRU_NUM_DSR_BYTES;
for_each_possible_blade(bid) {
pnode = uv_blade_to_pnode(bid);
nid = uv_blade_to_memory_nid(bid);/* -1 if no memory on blade */
page = alloc_pages_node(nid, GFP_KERNEL, order);
if (!page)
goto fail;
gru_base[bid] = page_address(page);
memset(gru_base[bid], 0, sizeof(struct gru_blade_state));
gru_base[bid]->bs_lru_gru = &gru_base[bid]->bs_grus[0];
spin_lock_init(&gru_base[bid]->bs_lock);
init_rwsem(&gru_base[bid]->bs_kgts_sema);
dsrbytes = 0;
cbrs = 0;
for (gru = gru_base[bid]->bs_grus, chip = 0;
chip < GRU_CHIPLETS_PER_BLADE;
chip++, gru++) {
paddr = gru_chiplet_paddr(gru_base_paddr, pnode, chip);
vaddr = gru_chiplet_vaddr(gru_base_vaddr, pnode, chip);
gru_init_chiplet(gru, paddr, vaddr, bid, chip);
n = hweight64(gru->gs_cbr_map) * GRU_CBR_AU_SIZE;
cbrs = max(cbrs, n);
n = hweight64(gru->gs_dsr_map) * GRU_DSR_AU_BYTES;
dsrbytes = max(dsrbytes, n);
}
max_user_cbrs = min(max_user_cbrs, cbrs);
max_user_dsr_bytes = min(max_user_dsr_bytes, dsrbytes);
}
return 0;
fail:
for (bid--; bid >= 0; bid--)
free_pages((unsigned long)gru_base[bid], order);
return -ENOMEM;
}
static void gru_free_tables(void)
{
int bid;
int order = get_order(sizeof(struct gru_state) *
GRU_CHIPLETS_PER_BLADE);
for (bid = 0; bid < GRU_MAX_BLADES; bid++)
free_pages((unsigned long)gru_base[bid], order);
}
static unsigned long gru_chiplet_cpu_to_mmr(int chiplet, int cpu, int *corep)
{
unsigned long mmr = 0;
int core;
/*
* We target the cores of a blade and not the hyperthreads themselves.
* There is a max of 8 cores per socket and 2 sockets per blade,
* making for a max total of 16 cores (i.e., 16 CPUs without
* hyperthreading and 32 CPUs with hyperthreading).
*/
core = uv_cpu_core_number(cpu) + UV_MAX_INT_CORES * uv_cpu_socket_number(cpu);
if (core >= GRU_NUM_TFM || uv_cpu_ht_number(cpu))
return 0;
if (chiplet == 0) {
mmr = UVH_GR0_TLB_INT0_CONFIG +
core * (UVH_GR0_TLB_INT1_CONFIG - UVH_GR0_TLB_INT0_CONFIG);
} else if (chiplet == 1) {
mmr = UVH_GR1_TLB_INT0_CONFIG +
core * (UVH_GR1_TLB_INT1_CONFIG - UVH_GR1_TLB_INT0_CONFIG);
} else {
BUG();
}
*corep = core;
return mmr;
}
#ifdef CONFIG_IA64
static int gru_irq_count[GRU_CHIPLETS_PER_BLADE];
static void gru_noop(unsigned int irq)
{
}
static struct irq_chip gru_chip[GRU_CHIPLETS_PER_BLADE] = {
[0 ... GRU_CHIPLETS_PER_BLADE - 1] {
.mask = gru_noop,
.unmask = gru_noop,
.ack = gru_noop
}
};
static int gru_chiplet_setup_tlb_irq(int chiplet, char *irq_name,
irq_handler_t irq_handler, int cpu, int blade)
{
unsigned long mmr;
int irq = IRQ_GRU + chiplet;
int ret, core;
mmr = gru_chiplet_cpu_to_mmr(chiplet, cpu, &core);
if (mmr == 0)
return 0;
if (gru_irq_count[chiplet] == 0) {
gru_chip[chiplet].name = irq_name;
ret = set_irq_chip(irq, &gru_chip[chiplet]);
if (ret) {
printk(KERN_ERR "%s: set_irq_chip failed, errno=%d\n",
GRU_DRIVER_ID_STR, -ret);
return ret;
}
ret = request_irq(irq, irq_handler, 0, irq_name, NULL);
if (ret) {
printk(KERN_ERR "%s: request_irq failed, errno=%d\n",
GRU_DRIVER_ID_STR, -ret);
return ret;
}
}
gru_irq_count[chiplet]++;
return 0;
}
static void gru_chiplet_teardown_tlb_irq(int chiplet, int cpu, int blade)
{
unsigned long mmr;
int core, irq = IRQ_GRU + chiplet;
if (gru_irq_count[chiplet] == 0)
return;
mmr = gru_chiplet_cpu_to_mmr(chiplet, cpu, &core);
if (mmr == 0)
return;
if (--gru_irq_count[chiplet] == 0)
free_irq(irq, NULL);
}
#elif defined CONFIG_X86_64
static int gru_chiplet_setup_tlb_irq(int chiplet, char *irq_name,
irq_handler_t irq_handler, int cpu, int blade)
{
unsigned long mmr;
int irq, core;
int ret;
mmr = gru_chiplet_cpu_to_mmr(chiplet, cpu, &core);
if (mmr == 0)
return 0;
irq = uv_setup_irq(irq_name, cpu, blade, mmr, UV_AFFINITY_CPU);
if (irq < 0) {
printk(KERN_ERR "%s: uv_setup_irq failed, errno=%d\n",
GRU_DRIVER_ID_STR, -irq);
return irq;
}
ret = request_irq(irq, irq_handler, 0, irq_name, NULL);
if (ret) {
uv_teardown_irq(irq);
printk(KERN_ERR "%s: request_irq failed, errno=%d\n",
GRU_DRIVER_ID_STR, -ret);
return ret;
}
gru_base[blade]->bs_grus[chiplet].gs_irq[core] = irq;
return 0;
}
static void gru_chiplet_teardown_tlb_irq(int chiplet, int cpu, int blade)
{
int irq, core;
unsigned long mmr;
mmr = gru_chiplet_cpu_to_mmr(chiplet, cpu, &core);
if (mmr) {
irq = gru_base[blade]->bs_grus[chiplet].gs_irq[core];
if (irq) {
free_irq(irq, NULL);
uv_teardown_irq(irq);
}
}
}
#endif
static void gru_teardown_tlb_irqs(void)
{
int blade;
int cpu;
for_each_online_cpu(cpu) {
blade = uv_cpu_to_blade_id(cpu);
gru_chiplet_teardown_tlb_irq(0, cpu, blade);
gru_chiplet_teardown_tlb_irq(1, cpu, blade);
}
for_each_possible_blade(blade) {
if (uv_blade_nr_possible_cpus(blade))
continue;
gru_chiplet_teardown_tlb_irq(0, 0, blade);
gru_chiplet_teardown_tlb_irq(1, 0, blade);
}
}
static int gru_setup_tlb_irqs(void)
{
int blade;
int cpu;
int ret;
for_each_online_cpu(cpu) {
blade = uv_cpu_to_blade_id(cpu);
ret = gru_chiplet_setup_tlb_irq(0, "GRU0_TLB", gru0_intr, cpu, blade);
if (ret != 0)
goto exit1;
ret = gru_chiplet_setup_tlb_irq(1, "GRU1_TLB", gru1_intr, cpu, blade);
if (ret != 0)
goto exit1;
}
for_each_possible_blade(blade) {
if (uv_blade_nr_possible_cpus(blade))
continue;
ret = gru_chiplet_setup_tlb_irq(0, "GRU0_TLB", gru_intr_mblade, 0, blade);
if (ret != 0)
goto exit1;
ret = gru_chiplet_setup_tlb_irq(1, "GRU1_TLB", gru_intr_mblade, 0, blade);
if (ret != 0)
goto exit1;
}
return 0;
exit1:
gru_teardown_tlb_irqs();
return ret;
}
/*
* gru_init
*
* Called at boot or module load time to initialize the GRUs.
*/
static int __init gru_init(void)
{
int ret;
if (!is_uv_system())
return 0;
#if defined CONFIG_IA64
gru_start_paddr = 0xd000000000UL; /* ZZZZZZZZZZZZZZZZZZZ fixme */
#else
gru_start_paddr = uv_read_local_mmr(UVH_RH_GAM_GRU_OVERLAY_CONFIG_MMR) &
0x7fffffffffffUL;
#endif
gru_start_vaddr = __va(gru_start_paddr);
gru_end_paddr = gru_start_paddr + GRU_MAX_BLADES * GRU_SIZE;
printk(KERN_INFO "GRU space: 0x%lx - 0x%lx\n",
gru_start_paddr, gru_end_paddr);
ret = misc_register(&gru_miscdev);
if (ret) {
printk(KERN_ERR "%s: misc_register failed\n",
GRU_DRIVER_ID_STR);
goto exit0;
}
ret = gru_proc_init();
if (ret) {
printk(KERN_ERR "%s: proc init failed\n", GRU_DRIVER_ID_STR);
goto exit1;
}
ret = gru_init_tables(gru_start_paddr, gru_start_vaddr);
if (ret) {
printk(KERN_ERR "%s: init tables failed\n", GRU_DRIVER_ID_STR);
goto exit2;
}
ret = gru_setup_tlb_irqs();
if (ret != 0)
goto exit3;
gru_kservices_init();
printk(KERN_INFO "%s: v%s\n", GRU_DRIVER_ID_STR,
GRU_DRIVER_VERSION_STR);
return 0;
exit3:
gru_free_tables();
exit2:
gru_proc_exit();
exit1:
misc_deregister(&gru_miscdev);
exit0:
return ret;
}
static void __exit gru_exit(void)
{
if (!is_uv_system())
return;
gru_teardown_tlb_irqs();
gru_kservices_exit();
gru_free_tables();
misc_deregister(&gru_miscdev);
gru_proc_exit();
}
static const struct file_operations gru_fops = {
.owner = THIS_MODULE,
.unlocked_ioctl = gru_file_unlocked_ioctl,
.mmap = gru_file_mmap,
.llseek = noop_llseek,
};
static struct miscdevice gru_miscdev = {
.minor = MISC_DYNAMIC_MINOR,
.name = "gru",
.fops = &gru_fops,
};
const struct vm_operations_struct gru_vm_ops = {
.close = gru_vma_close,
.fault = gru_fault,
};
#ifndef MODULE
fs_initcall(gru_init);
#else
module_init(gru_init);
#endif
module_exit(gru_exit);
module_param(gru_options, ulong, 0644);
MODULE_PARM_DESC(gru_options, "Various debug options");
MODULE_AUTHOR("Silicon Graphics, Inc.");
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION(GRU_DRIVER_ID_STR GRU_DRIVER_VERSION_STR);
MODULE_VERSION(GRU_DRIVER_VERSION_STR);
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