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, 3 insertions, 6 deletions

diff --git a/drivers/usb/core/hcd.h b/drivers/usb/core/hcd.h
index 676877c15f81..8f8df0d4382e 100644
--- a/drivers/usb/core/hcd.h
+++ b/drivers/usb/core/hcd.h
@@ -143,15 +143,13 @@ struct hcd_timeout {	/* timeouts we allocate */
 /*-------------------------------------------------------------------------*/
 
 
-struct pt_regs;
-
 struct hc_driver {
 	const char	*description;	/* "ehci-hcd" etc */
 	const char	*product_desc;	/* product/vendor string */
 	size_t		hcd_priv_size;	/* size of private data */
 
 	/* irq handler */
-	irqreturn_t	(*irq) (struct usb_hcd *hcd, struct pt_regs *regs);
+	irqreturn_t	(*irq) (struct usb_hcd *hcd);
 
 	int	flags;
 #define	HCD_MEMORY	0x0001		/* HC regs use memory (else I/O) */
@@ -205,8 +203,7 @@ struct hc_driver {
 
 extern int usb_hcd_submit_urb (struct urb *urb, gfp_t mem_flags);
 extern int usb_hcd_unlink_urb (struct urb *urb, int status);
-extern void usb_hcd_giveback_urb (struct usb_hcd *hcd, struct urb *urb,
-		struct pt_regs *regs);
+extern void usb_hcd_giveback_urb (struct usb_hcd *hcd, struct urb *urb);
 extern void usb_hcd_endpoint_disable (struct usb_device *udev,
 		struct usb_host_endpoint *ep);
 extern int usb_hcd_get_frame_number (struct usb_device *udev);
@@ -248,7 +245,7 @@ void hcd_buffer_free (struct usb_bus *bus, size_t size,
 	void *addr, dma_addr_t dma);
 
 /* generic bus glue, needed for host controllers that don't use PCI */
-extern irqreturn_t usb_hcd_irq (int irq, void *__hcd, struct pt_regs *r);
+extern irqreturn_t usb_hcd_irq (int irq, void *__hcd);
 
 extern void usb_hc_died (struct usb_hcd *hcd);
 extern void usb_hcd_poll_rh_status(struct usb_hcd *hcd);