From 7d12e780e003f93433d49ce78cfedf4b4c52adc5 Mon Sep 17 00:00:00 2001 From: David Howells Date: Thu, 5 Oct 2006 14:55:46 +0100 Subject: 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 (cherry picked from 1b16e7ac850969f38b375e511e3fa2f474a33867 commit) --- drivers/media/video/usbvideo/konicawc.c | 2 +- drivers/media/video/usbvideo/quickcam_messenger.c | 4 ++-- drivers/media/video/usbvideo/usbvideo.c | 2 +- 3 files changed, 4 insertions(+), 4 deletions(-) (limited to 'drivers/media/video/usbvideo') diff --git a/drivers/media/video/usbvideo/konicawc.c b/drivers/media/video/usbvideo/konicawc.c index 4eee8be88314..abe214619092 100644 --- a/drivers/media/video/usbvideo/konicawc.c +++ b/drivers/media/video/usbvideo/konicawc.c @@ -387,7 +387,7 @@ static void resubmit_urb(struct uvd *uvd, struct urb *urb) } -static void konicawc_isoc_irq(struct urb *urb, struct pt_regs *regs) +static void konicawc_isoc_irq(struct urb *urb) { struct uvd *uvd = urb->context; struct konicawc *cam = (struct konicawc *)uvd->user_data; diff --git a/drivers/media/video/usbvideo/quickcam_messenger.c b/drivers/media/video/usbvideo/quickcam_messenger.c index 56e01b622417..9a26b9484aae 100644 --- a/drivers/media/video/usbvideo/quickcam_messenger.c +++ b/drivers/media/video/usbvideo/quickcam_messenger.c @@ -125,7 +125,7 @@ static void qcm_report_buttonstat(struct qcm *cam) } } -static void qcm_int_irq(struct urb *urb, struct pt_regs *regs) +static void qcm_int_irq(struct urb *urb) { int ret; struct uvd *uvd = urb->context; @@ -606,7 +606,7 @@ static void resubmit_urb(struct uvd *uvd, struct urb *urb) err("usb_submit_urb error (%d)", ret); } -static void qcm_isoc_irq(struct urb *urb, struct pt_regs *regs) +static void qcm_isoc_irq(struct urb *urb) { int len; struct uvd *uvd = urb->context; diff --git a/drivers/media/video/usbvideo/usbvideo.c b/drivers/media/video/usbvideo/usbvideo.c index 13b37c8c0d56..d8b88024bc2f 100644 --- a/drivers/media/video/usbvideo/usbvideo.c +++ b/drivers/media/video/usbvideo/usbvideo.c @@ -1680,7 +1680,7 @@ static int usbvideo_CompressIsochronous(struct uvd *uvd, struct urb *urb) return totlen; } -static void usbvideo_IsocIrq(struct urb *urb, struct pt_regs *regs) +static void usbvideo_IsocIrq(struct urb *urb) { int i, ret, len; struct uvd *uvd = urb->context; -- cgit v1.2.2