IRQ: Maintain regs pointer globally rather than passing to IRQ handlers

Maintain a per-CPU global "struct pt_regs *" variable which can be used instead
of passing regs around manually through all ~1800 interrupt handlers in the
Linux kernel.

The regs pointer is used in few places, but it potentially costs both stack
space and code to pass it around.  On the FRV arch, removing the regs parameter
from all the genirq function results in a 20% speed up of the IRQ exit path
(ie: from leaving timer_interrupt() to leaving do_IRQ()).

Where appropriate, an arch may override the generic storage facility and do
something different with the variable.  On FRV, for instance, the address is
maintained in GR28 at all times inside the kernel as part of general exception
handling.

Having looked over the code, it appears that the parameter may be handed down
through up to twenty or so layers of functions.  Consider a USB character
device attached to a USB hub, attached to a USB controller that posts its
interrupts through a cascaded auxiliary interrupt controller.  A character
device driver may want to pass regs to the sysrq handler through the input
layer which adds another few layers of parameter passing.

I've build this code with allyesconfig for x86_64 and i386.  I've runtested the
main part of the code on FRV and i386, though I can't test most of the drivers.
I've also done partial conversion for powerpc and MIPS - these at least compile
with minimal configurations.

This will affect all archs.  Mostly the changes should be relatively easy.
Take do_IRQ(), store the regs pointer at the beginning, saving the old one:

	struct pt_regs *old_regs = set_irq_regs(regs);

And put the old one back at the end:

	set_irq_regs(old_regs);

Don't pass regs through to generic_handle_irq() or __do_IRQ().

In timer_interrupt(), this sort of change will be necessary:

	-	update_process_times(user_mode(regs));
	-	profile_tick(CPU_PROFILING, regs);
	+	update_process_times(user_mode(get_irq_regs()));
	+	profile_tick(CPU_PROFILING);

I'd like to move update_process_times()'s use of get_irq_regs() into itself,
except that i386, alone of the archs, uses something other than user_mode().

Some notes on the interrupt handling in the drivers:

 (*) input_dev() is now gone entirely.  The regs pointer is no longer stored in
     the input_dev struct.

 (*) finish_unlinks() in drivers/usb/host/ohci-q.c needs checking.  It does
     something different depending on whether it's been supplied with a regs
     pointer or not.

 (*) Various IRQ handler function pointers have been moved to type
     irq_handler_t.

Signed-Off-By: David Howells <dhowells@redhat.com>
(cherry picked from 1b16e7ac850969f38b375e511e3fa2f474a33867 commit)

1 files changed, 4 insertions, 7 deletions

diff --git a/drivers/serial/sn_console.c b/drivers/serial/sn_console.c
index 2f148e5b9255..709f93a6c18c 100644
--- a/drivers/serial/sn_console.c
+++ b/drivers/serial/sn_console.c
@@ -447,7 +447,6 @@ static int sn_debug_printf(const char *fmt, ...)
 /**
  * sn_receive_chars - Grab characters, pass them to tty layer
  * @port: Port to operate on
- * @regs: Saved registers (needed by uart_handle_sysrq_char)
  * @flags: irq flags
  *
  * Note: If we're not registered with the serial core infrastructure yet,
@@ -455,8 +454,7 @@ static int sn_debug_printf(const char *fmt, ...)
  *
  */
 static void
-sn_receive_chars(struct sn_cons_port *port, struct pt_regs *regs,
-                 unsigned long flags)
+sn_receive_chars(struct sn_cons_port *port, unsigned long flags)
 {
         int ch;
         struct tty_struct *tty;
@@ -494,7 +492,7 @@ sn_receive_chars(struct sn_cons_port *port, struct pt_regs *regs,
                         sysrq_requested = 0;
                         if (ch && time_before(jiffies, sysrq_timeout)) {
                                 spin_unlock_irqrestore(&port->sc_port.lock, flags);
-                                handle_sysrq(ch, regs, NULL);
+                                handle_sysrq(ch, NULL);
                                 spin_lock_irqsave(&port->sc_port.lock, flags);
                                 /* ignore actual sysrq command char */
                                 continue;
@@ -615,10 +613,9 @@ static void sn_transmit_chars(struct sn_cons_port *port, int raw)
  * sn_sal_interrupt - Handle console interrupts
  * @irq: irq #, useful for debug statements
  * @dev_id: our pointer to our port (sn_cons_port which contains the uart port)
- * @regs: Saved registers, used by sn_receive_chars for uart_handle_sysrq_char
  *
  */
-static irqreturn_t sn_sal_interrupt(int irq, void *dev_id, struct pt_regs *regs)
+static irqreturn_t sn_sal_interrupt(int irq, void *dev_id)
 {
         struct sn_cons_port *port = (struct sn_cons_port *)dev_id;
         unsigned long flags;
@@ -629,7 +626,7 @@ static irqreturn_t sn_sal_interrupt(int irq, void *dev_id, struct pt_regs *regs)
 
         spin_lock_irqsave(&port->sc_port.lock, flags);
         if (status & SAL_CONSOLE_INTR_RECV) {
-                sn_receive_chars(port, regs, flags);
+                sn_receive_chars(port, flags);
         }
         if (status & SAL_CONSOLE_INTR_XMIT) {
                 sn_transmit_chars(port, TRANSMIT_BUFFERED);