linux-stable/drivers/pci/htirq.c
Tejun Heo 5a0e3ad6af include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h
percpu.h is included by sched.h and module.h and thus ends up being
included when building most .c files.  percpu.h includes slab.h which
in turn includes gfp.h making everything defined by the two files
universally available and complicating inclusion dependencies.

percpu.h -> slab.h dependency is about to be removed.  Prepare for
this change by updating users of gfp and slab facilities include those
headers directly instead of assuming availability.  As this conversion
needs to touch large number of source files, the following script is
used as the basis of conversion.

  http://userweb.kernel.org/~tj/misc/slabh-sweep.py

The script does the followings.

* Scan files for gfp and slab usages and update includes such that
  only the necessary includes are there.  ie. if only gfp is used,
  gfp.h, if slab is used, slab.h.

* When the script inserts a new include, it looks at the include
  blocks and try to put the new include such that its order conforms
  to its surrounding.  It's put in the include block which contains
  core kernel includes, in the same order that the rest are ordered -
  alphabetical, Christmas tree, rev-Xmas-tree or at the end if there
  doesn't seem to be any matching order.

* If the script can't find a place to put a new include (mostly
  because the file doesn't have fitting include block), it prints out
  an error message indicating which .h file needs to be added to the
  file.

The conversion was done in the following steps.

1. The initial automatic conversion of all .c files updated slightly
   over 4000 files, deleting around 700 includes and adding ~480 gfp.h
   and ~3000 slab.h inclusions.  The script emitted errors for ~400
   files.

2. Each error was manually checked.  Some didn't need the inclusion,
   some needed manual addition while adding it to implementation .h or
   embedding .c file was more appropriate for others.  This step added
   inclusions to around 150 files.

3. The script was run again and the output was compared to the edits
   from #2 to make sure no file was left behind.

4. Several build tests were done and a couple of problems were fixed.
   e.g. lib/decompress_*.c used malloc/free() wrappers around slab
   APIs requiring slab.h to be added manually.

5. The script was run on all .h files but without automatically
   editing them as sprinkling gfp.h and slab.h inclusions around .h
   files could easily lead to inclusion dependency hell.  Most gfp.h
   inclusion directives were ignored as stuff from gfp.h was usually
   wildly available and often used in preprocessor macros.  Each
   slab.h inclusion directive was examined and added manually as
   necessary.

6. percpu.h was updated not to include slab.h.

7. Build test were done on the following configurations and failures
   were fixed.  CONFIG_GCOV_KERNEL was turned off for all tests (as my
   distributed build env didn't work with gcov compiles) and a few
   more options had to be turned off depending on archs to make things
   build (like ipr on powerpc/64 which failed due to missing writeq).

   * x86 and x86_64 UP and SMP allmodconfig and a custom test config.
   * powerpc and powerpc64 SMP allmodconfig
   * sparc and sparc64 SMP allmodconfig
   * ia64 SMP allmodconfig
   * s390 SMP allmodconfig
   * alpha SMP allmodconfig
   * um on x86_64 SMP allmodconfig

8. percpu.h modifications were reverted so that it could be applied as
   a separate patch and serve as bisection point.

Given the fact that I had only a couple of failures from tests on step
6, I'm fairly confident about the coverage of this conversion patch.
If there is a breakage, it's likely to be something in one of the arch
headers which should be easily discoverable easily on most builds of
the specific arch.

Signed-off-by: Tejun Heo <tj@kernel.org>
Guess-its-ok-by: Christoph Lameter <cl@linux-foundation.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
2010-03-30 22:02:32 +09:00

181 lines
4.2 KiB
C

/*
* File: htirq.c
* Purpose: Hypertransport Interrupt Capability
*
* Copyright (C) 2006 Linux Networx
* Copyright (C) Eric Biederman <ebiederman@lnxi.com>
*/
#include <linux/irq.h>
#include <linux/pci.h>
#include <linux/spinlock.h>
#include <linux/slab.h>
#include <linux/htirq.h>
/* Global ht irq lock.
*
* This is needed to serialize access to the data port in hypertransport
* irq capability.
*
* With multiple simultaneous hypertransport irq devices it might pay
* to make this more fine grained. But start with simple, stupid, and correct.
*/
static DEFINE_SPINLOCK(ht_irq_lock);
struct ht_irq_cfg {
struct pci_dev *dev;
/* Update callback used to cope with buggy hardware */
ht_irq_update_t *update;
unsigned pos;
unsigned idx;
struct ht_irq_msg msg;
};
void write_ht_irq_msg(unsigned int irq, struct ht_irq_msg *msg)
{
struct ht_irq_cfg *cfg = get_irq_data(irq);
unsigned long flags;
spin_lock_irqsave(&ht_irq_lock, flags);
if (cfg->msg.address_lo != msg->address_lo) {
pci_write_config_byte(cfg->dev, cfg->pos + 2, cfg->idx);
pci_write_config_dword(cfg->dev, cfg->pos + 4, msg->address_lo);
}
if (cfg->msg.address_hi != msg->address_hi) {
pci_write_config_byte(cfg->dev, cfg->pos + 2, cfg->idx + 1);
pci_write_config_dword(cfg->dev, cfg->pos + 4, msg->address_hi);
}
if (cfg->update)
cfg->update(cfg->dev, irq, msg);
spin_unlock_irqrestore(&ht_irq_lock, flags);
cfg->msg = *msg;
}
void fetch_ht_irq_msg(unsigned int irq, struct ht_irq_msg *msg)
{
struct ht_irq_cfg *cfg = get_irq_data(irq);
*msg = cfg->msg;
}
void mask_ht_irq(unsigned int irq)
{
struct ht_irq_cfg *cfg;
struct ht_irq_msg msg;
cfg = get_irq_data(irq);
msg = cfg->msg;
msg.address_lo |= 1;
write_ht_irq_msg(irq, &msg);
}
void unmask_ht_irq(unsigned int irq)
{
struct ht_irq_cfg *cfg;
struct ht_irq_msg msg;
cfg = get_irq_data(irq);
msg = cfg->msg;
msg.address_lo &= ~1;
write_ht_irq_msg(irq, &msg);
}
/**
* __ht_create_irq - create an irq and attach it to a device.
* @dev: The hypertransport device to find the irq capability on.
* @idx: Which of the possible irqs to attach to.
* @update: Function to be called when changing the htirq message
*
* The irq number of the new irq or a negative error value is returned.
*/
int __ht_create_irq(struct pci_dev *dev, int idx, ht_irq_update_t *update)
{
struct ht_irq_cfg *cfg;
unsigned long flags;
u32 data;
int max_irq;
int pos;
int irq;
int node;
pos = pci_find_ht_capability(dev, HT_CAPTYPE_IRQ);
if (!pos)
return -EINVAL;
/* Verify the idx I want to use is in range */
spin_lock_irqsave(&ht_irq_lock, flags);
pci_write_config_byte(dev, pos + 2, 1);
pci_read_config_dword(dev, pos + 4, &data);
spin_unlock_irqrestore(&ht_irq_lock, flags);
max_irq = (data >> 16) & 0xff;
if ( idx > max_irq)
return -EINVAL;
cfg = kmalloc(sizeof(*cfg), GFP_KERNEL);
if (!cfg)
return -ENOMEM;
cfg->dev = dev;
cfg->update = update;
cfg->pos = pos;
cfg->idx = 0x10 + (idx * 2);
/* Initialize msg to a value that will never match the first write. */
cfg->msg.address_lo = 0xffffffff;
cfg->msg.address_hi = 0xffffffff;
node = dev_to_node(&dev->dev);
irq = create_irq_nr(0, node);
if (irq <= 0) {
kfree(cfg);
return -EBUSY;
}
set_irq_data(irq, cfg);
if (arch_setup_ht_irq(irq, dev) < 0) {
ht_destroy_irq(irq);
return -EBUSY;
}
return irq;
}
/**
* ht_create_irq - create an irq and attach it to a device.
* @dev: The hypertransport device to find the irq capability on.
* @idx: Which of the possible irqs to attach to.
*
* ht_create_irq needs to be called for all hypertransport devices
* that generate irqs.
*
* The irq number of the new irq or a negative error value is returned.
*/
int ht_create_irq(struct pci_dev *dev, int idx)
{
return __ht_create_irq(dev, idx, NULL);
}
/**
* ht_destroy_irq - destroy an irq created with ht_create_irq
* @irq: irq to be destroyed
*
* This reverses ht_create_irq removing the specified irq from
* existence. The irq should be free before this happens.
*/
void ht_destroy_irq(unsigned int irq)
{
struct ht_irq_cfg *cfg;
cfg = get_irq_data(irq);
set_irq_chip(irq, NULL);
set_irq_data(irq, NULL);
destroy_irq(irq);
kfree(cfg);
}
EXPORT_SYMBOL(__ht_create_irq);
EXPORT_SYMBOL(ht_create_irq);
EXPORT_SYMBOL(ht_destroy_irq);