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7d12e780e0
android_kernel_xiaomi_sm8350/drivers/scsi
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David Howells 7d12e780e0 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)
2006-10-05 15:10:12 +01:00
..
aacraid IRQ: Maintain regs pointer globally rather than passing to IRQ handlers 2006-10-05 15:10:12 +01:00
aic7xxx IRQ: Maintain regs pointer globally rather than passing to IRQ handlers 2006-10-05 15:10:12 +01:00
aic7xxx_old Remove obsolete #include <linux/config.h> 2006-06-30 19:25:36 +02:00
aic94xx IRQ: Maintain regs pointer globally rather than passing to IRQ handlers 2006-10-05 15:10:12 +01:00
arcmsr IRQ: Maintain regs pointer globally rather than passing to IRQ handlers 2006-10-05 15:10:12 +01:00
arm IRQ: Maintain regs pointer globally rather than passing to IRQ handlers 2006-10-05 15:10:12 +01:00
dpt [SCSI] drivers/scsi/dpt/dpti_i2o.h: removal of old scsi code 2006-09-26 10:40:13 -07:00
ibmvscsi IRQ: Maintain regs pointer globally rather than passing to IRQ handlers 2006-10-05 15:10:12 +01:00
libsas [PATCH] SCSI: fix request flag-related build breakage 2006-09-30 19:33:43 -07:00
lpfc IRQ: Maintain regs pointer globally rather than passing to IRQ handlers 2006-10-05 15:10:12 +01:00
megaraid IRQ: Maintain regs pointer globally rather than passing to IRQ handlers 2006-10-05 15:10:12 +01:00
pcmcia IRQ: Maintain regs pointer globally rather than passing to IRQ handlers 2006-10-05 15:10:12 +01:00
qla2xxx IRQ: Maintain regs pointer globally rather than passing to IRQ handlers 2006-10-05 15:10:12 +01:00
qla4xxx IRQ: Maintain regs pointer globally rather than passing to IRQ handlers 2006-10-05 15:10:12 +01:00
sym53c8xx_2 IRQ: Maintain regs pointer globally rather than passing to IRQ handlers 2006-10-05 15:10:12 +01:00
.gitignore
3w-9xxx.c IRQ: Maintain regs pointer globally rather than passing to IRQ handlers 2006-10-05 15:10:12 +01:00
3w-9xxx.h
3w-xxxx.c IRQ: Maintain regs pointer globally rather than passing to IRQ handlers 2006-10-05 15:10:12 +01:00
3w-xxxx.h [SCSI] 3w-xxxx: fix "ATA UDMA upgrade" message number 2006-09-26 10:39:27 -07:00
53c7xx_d.h_shipped
53c7xx_u.h_shipped
53c7xx.c IRQ: Maintain regs pointer globally rather than passing to IRQ handlers 2006-10-05 15:10:12 +01:00
53c7xx.h
53c7xx.scr
53c700_d.h_shipped
53c700.c IRQ: Maintain regs pointer globally rather than passing to IRQ handlers 2006-10-05 15:10:12 +01:00
53c700.h IRQ: Maintain regs pointer globally rather than passing to IRQ handlers 2006-10-05 15:10:12 +01:00
53c700.scr
a100u2w.c IRQ: Maintain regs pointer globally rather than passing to IRQ handlers 2006-10-05 15:10:12 +01:00
a100u2w.h
a2091.c IRQ: Maintain regs pointer globally rather than passing to IRQ handlers 2006-10-05 15:10:12 +01:00
a2091.h [SCSI] wd33c93: Scsi_Cmnd convertion 2006-09-12 17:12:31 -05:00
a3000.c IRQ: Maintain regs pointer globally rather than passing to IRQ handlers 2006-10-05 15:10:12 +01:00
a3000.h [SCSI] wd33c93: Scsi_Cmnd convertion 2006-09-12 17:12:31 -05:00
advansys.c IRQ: Maintain regs pointer globally rather than passing to IRQ handlers 2006-10-05 15:10:12 +01:00
advansys.h
aha152x.c IRQ: Maintain regs pointer globally rather than passing to IRQ handlers 2006-10-05 15:10:12 +01:00
aha152x.h
aha1542.c IRQ: Maintain regs pointer globally rather than passing to IRQ handlers 2006-10-05 15:10:12 +01:00
aha1542.h
aha1740.c IRQ: Maintain regs pointer globally rather than passing to IRQ handlers 2006-10-05 15:10:12 +01:00
aha1740.h
aic7xxx_old.c IRQ: Maintain regs pointer globally rather than passing to IRQ handlers 2006-10-05 15:10:12 +01:00
amiga7xx.c Remove obsolete #include <linux/config.h> 2006-06-30 19:25:36 +02:00
amiga7xx.h IRQ: Maintain regs pointer globally rather than passing to IRQ handlers 2006-10-05 15:10:12 +01:00
atari_dma_emul.c IRQ: Maintain regs pointer globally rather than passing to IRQ handlers 2006-10-05 15:10:12 +01:00
atari_NCR5380.c IRQ: Maintain regs pointer globally rather than passing to IRQ handlers 2006-10-05 15:10:12 +01:00
atari_scsi.c IRQ: Maintain regs pointer globally rather than passing to IRQ handlers 2006-10-05 15:10:12 +01:00
atari_scsi.h
atp870u.c IRQ: Maintain regs pointer globally rather than passing to IRQ handlers 2006-10-05 15:10:12 +01:00
atp870u.h
blz1230.c [PATCH] irq-flags: scsi: Use the new IRQF_ constants 2006-07-02 13:58:53 -07:00
blz2060.c [PATCH] irq-flags: scsi: Use the new IRQF_ constants 2006-07-02 13:58:53 -07:00
BusLogic.c IRQ: Maintain regs pointer globally rather than passing to IRQ handlers 2006-10-05 15:10:12 +01:00
BusLogic.h IRQ: Maintain regs pointer globally rather than passing to IRQ handlers 2006-10-05 15:10:12 +01:00
bvme6000.c
bvme6000.h IRQ: Maintain regs pointer globally rather than passing to IRQ handlers 2006-10-05 15:10:12 +01:00
ch.c Remove obsolete #include <linux/config.h> 2006-06-30 19:25:36 +02:00
constants.c [SCSI] update additional sense codes and some opcode names 2006-07-09 09:10:06 -05:00
cyberstorm.c [PATCH] irq-flags: scsi: Use the new IRQF_ constants 2006-07-02 13:58:53 -07:00
cyberstormII.c [PATCH] irq-flags: scsi: Use the new IRQF_ constants 2006-07-02 13:58:53 -07:00
dc395x.c IRQ: Maintain regs pointer globally rather than passing to IRQ handlers 2006-10-05 15:10:12 +01:00
dc395x.h
dec_esp.c IRQ: Maintain regs pointer globally rather than passing to IRQ handlers 2006-10-05 15:10:12 +01:00
dmx3191d.c [SCSI] pci_module_init conversion in scsi subsystem 2006-09-26 11:35:32 -07:00
dpt_i2o.c IRQ: Maintain regs pointer globally rather than passing to IRQ handlers 2006-10-05 15:10:12 +01:00
dpti.h IRQ: Maintain regs pointer globally rather than passing to IRQ handlers 2006-10-05 15:10:12 +01:00
dtc.c [PATCH] irq-flags: scsi: Use the new IRQF_ constants 2006-07-02 13:58:53 -07:00
dtc.h
eata_generic.h [SCSI] eata_pio cleanup and PCI fix 2006-09-23 20:28:19 -05:00
eata_pio.c IRQ: Maintain regs pointer globally rather than passing to IRQ handlers 2006-10-05 15:10:12 +01:00
eata_pio.h
eata.c IRQ: Maintain regs pointer globally rather than passing to IRQ handlers 2006-10-05 15:10:12 +01:00
esp.c IRQ: Maintain regs pointer globally rather than passing to IRQ handlers 2006-10-05 15:10:12 +01:00
esp.h
fastlane.c [PATCH] irq-flags: scsi: Use the new IRQF_ constants 2006-07-02 13:58:53 -07:00
fcal.c [SCSI] Improve inquiry printing 2006-08-06 15:59:26 -05:00
fcal.h
fd_mcs.c IRQ: Maintain regs pointer globally rather than passing to IRQ handlers 2006-10-05 15:10:12 +01:00
fdomain.c IRQ: Maintain regs pointer globally rather than passing to IRQ handlers 2006-10-05 15:10:12 +01:00
fdomain.h
FlashPoint.c Remove obsolete #include <linux/config.h> 2006-06-30 19:25:36 +02:00
g_NCR5380_mmio.c
g_NCR5380.c [SCSI] Improve inquiry printing 2006-08-06 15:59:26 -05:00
g_NCR5380.h Remove obsolete #include <linux/config.h> 2006-06-30 19:25:36 +02:00
gdth_ioctl.h
gdth_kcompat.h
gdth_proc.c
gdth_proc.h
gdth.c IRQ: Maintain regs pointer globally rather than passing to IRQ handlers 2006-10-05 15:10:12 +01:00
gdth.h [SCSI] drivers/scsi/gdth.h: removal of old scsi code 2006-09-26 11:35:16 -07:00
gvp11.c IRQ: Maintain regs pointer globally rather than passing to IRQ handlers 2006-10-05 15:10:12 +01:00
gvp11.h [SCSI] wd33c93: Scsi_Cmnd convertion 2006-09-12 17:12:31 -05:00
hosts.c [SCSI] add shared tag map helpers 2006-08-31 11:18:03 -04:00
hptiop.c IRQ: Maintain regs pointer globally rather than passing to IRQ handlers 2006-10-05 15:10:12 +01:00
hptiop.h
ibmmca.c IRQ: Maintain regs pointer globally rather than passing to IRQ handlers 2006-10-05 15:10:12 +01:00
ibmmca.h
ide-scsi.c [PATCH] Remove ->rq_status from struct request 2006-09-30 20:29:23 +02:00
imm.c Remove obsolete #include <linux/config.h> 2006-06-30 19:25:36 +02:00
imm.h Remove all inclusions of <linux/config.h> 2006-10-04 03:38:54 -04:00
in2000.c IRQ: Maintain regs pointer globally rather than passing to IRQ handlers 2006-10-05 15:10:12 +01:00
in2000.h
initio.c IRQ: Maintain regs pointer globally rather than passing to IRQ handlers 2006-10-05 15:10:12 +01:00
initio.h Remove obsolete #include <linux/config.h> 2006-06-30 19:25:36 +02:00
ipr.c IRQ: Maintain regs pointer globally rather than passing to IRQ handlers 2006-10-05 15:10:12 +01:00
ipr.h [SCSI] ipr: Support attaching SATA devices 2006-09-26 09:23:18 -07:00
ips.c IRQ: Maintain regs pointer globally rather than passing to IRQ handlers 2006-10-05 15:10:12 +01:00
ips.h [SCSI] scsi: Convertion to struct scsi_cmnd in ips-driver 2006-10-03 17:28:29 -05:00
iscsi_tcp.c Merge mulgrave-w:git/scsi-misc-2.6 2006-09-23 15:33:43 -05:00
iscsi_tcp.h Merge mulgrave-w:git/scsi-misc-2.6 2006-09-23 15:33:43 -05:00
jazz_esp.c [SCSI] More buffer->request_buffer changes 2006-07-14 09:41:13 -05:00
Kconfig Merge master.kernel.org:/pub/scm/linux/kernel/git/jejb/scsi-misc-2.6 2006-10-04 18:57:35 -07:00
lasi700.c [PATCH] irq-flags: scsi: Use the new IRQF_ constants 2006-07-02 13:58:53 -07:00
libiscsi.c [SCSI] libiscsi: don't call into lld to cleanup task 2006-09-02 13:37:40 -05:00
mac53c94.c IRQ: Maintain regs pointer globally rather than passing to IRQ handlers 2006-10-05 15:10:12 +01:00
mac53c94.h
mac_esp.c IRQ: Maintain regs pointer globally rather than passing to IRQ handlers 2006-10-05 15:10:12 +01:00
mac_scsi.c
mac_scsi.h
Makefile [SCSI] Initial Commit of qla4xxx 2006-10-04 13:34:04 -05:00
mca_53c9x.c
megaraid.c IRQ: Maintain regs pointer globally rather than passing to IRQ handlers 2006-10-05 15:10:12 +01:00
megaraid.h IRQ: Maintain regs pointer globally rather than passing to IRQ handlers 2006-10-05 15:10:12 +01:00
mesh.c IRQ: Maintain regs pointer globally rather than passing to IRQ handlers 2006-10-05 15:10:12 +01:00
mesh.h
mvme16x.c
mvme16x.h IRQ: Maintain regs pointer globally rather than passing to IRQ handlers 2006-10-05 15:10:12 +01:00
mvme147.c IRQ: Maintain regs pointer globally rather than passing to IRQ handlers 2006-10-05 15:10:12 +01:00
mvme147.h [SCSI] wd33c93: Scsi_Cmnd convertion 2006-09-12 17:12:31 -05:00
ncr53c8xx.c IRQ: Maintain regs pointer globally rather than passing to IRQ handlers 2006-10-05 15:10:12 +01:00
ncr53c8xx.h IRQ: Maintain regs pointer globally rather than passing to IRQ handlers 2006-10-05 15:10:12 +01:00
NCR53c406a.c IRQ: Maintain regs pointer globally rather than passing to IRQ handlers 2006-10-05 15:10:12 +01:00
NCR53C9x.c IRQ: Maintain regs pointer globally rather than passing to IRQ handlers 2006-10-05 15:10:12 +01:00
NCR53C9x.h IRQ: Maintain regs pointer globally rather than passing to IRQ handlers 2006-10-05 15:10:12 +01:00
NCR5380.c IRQ: Maintain regs pointer globally rather than passing to IRQ handlers 2006-10-05 15:10:12 +01:00
NCR5380.h IRQ: Maintain regs pointer globally rather than passing to IRQ handlers 2006-10-05 15:10:12 +01:00
NCR_D700.c IRQ: Maintain regs pointer globally rather than passing to IRQ handlers 2006-10-05 15:10:12 +01:00
NCR_D700.h
NCR_Q720.c IRQ: Maintain regs pointer globally rather than passing to IRQ handlers 2006-10-05 15:10:12 +01:00
NCR_Q720.h
nsp32_debug.c
nsp32_io.h
nsp32.c IRQ: Maintain regs pointer globally rather than passing to IRQ handlers 2006-10-05 15:10:12 +01:00
nsp32.h [SCSI] drivers/scsi/nsp32.h: removal of old scsi code 2006-09-26 10:39:00 -07:00
oktagon_esp.c [PATCH] irq-flags: scsi: Use the new IRQF_ constants 2006-07-02 13:58:53 -07:00
oktagon_io.S Remove obsolete #include <linux/config.h> 2006-06-30 19:25:36 +02:00
osst_detect.h
osst_options.h
osst.c [SCSI] SCSI osst: add error handling to module init, sysfs 2006-10-04 13:12:44 -05:00
osst.h Remove obsolete #include <linux/config.h> 2006-06-30 19:25:36 +02:00
pas16.c [PATCH] irq-flags: scsi: Use the new IRQF_ constants 2006-07-02 13:58:53 -07:00
pas16.h
pci2000.h
pluto.c [PATCH] Split struct request ->flags into two parts 2006-09-30 20:23:37 +02:00
pluto.h
ppa.c Remove obsolete #include <linux/config.h> 2006-06-30 19:25:36 +02:00
ppa.h Remove all inclusions of <linux/config.h> 2006-10-04 03:38:54 -04:00
psi240i.c IRQ: Maintain regs pointer globally rather than passing to IRQ handlers 2006-10-05 15:10:12 +01:00
psi240i.h
psi_chip.h
ql1040_fw.h
ql1280_fw.h
ql12160_fw.h
qla1280.c IRQ: Maintain regs pointer globally rather than passing to IRQ handlers 2006-10-05 15:10:12 +01:00
qla1280.h
qlogicfas408.c IRQ: Maintain regs pointer globally rather than passing to IRQ handlers 2006-10-05 15:10:12 +01:00
qlogicfas408.h IRQ: Maintain regs pointer globally rather than passing to IRQ handlers 2006-10-05 15:10:12 +01:00
qlogicfas.c
qlogicpti_asm.c
qlogicpti.c IRQ: Maintain regs pointer globally rather than passing to IRQ handlers 2006-10-05 15:10:12 +01:00
qlogicpti.h
raid_class.c [SCSI] raid class: handle component-add errors 2006-10-04 13:27:26 -05:00
script_asm.pl
scsi_debug.c [SCSI] scsi_debug version 1.80 2006-09-23 17:37:44 -05:00
scsi_debug.h
scsi_devinfo.c [SCSI] scsi_devinfo: scsi2 HP and Hitachi entries 2006-10-01 15:09:19 -05:00
scsi_error.c [PATCH] SCSI: lockdep annotation in scsi_send_eh_cmnd 2006-09-13 07:32:14 -07:00
scsi_ioctl.c [PATCH] scsi: kill overeager "not-ready" messages 2006-07-28 09:04:09 +02:00
scsi_lib.c Merge master.kernel.org:/pub/scm/linux/kernel/git/jejb/scsi-misc-2.6 2006-10-04 18:57:35 -07:00
scsi_logging.h Remove obsolete #include <linux/config.h> 2006-06-30 19:25:36 +02:00
scsi_module.c
scsi_netlink.c [SCSI] SCSI and FC Transport: add netlink support for posting of transport events 2006-09-02 15:33:49 -05:00
scsi_priv.h [SCSI] SCSI and FC Transport: add netlink support for posting of transport events 2006-09-02 15:33:49 -05:00
scsi_proc.c [SCSI] Improve inquiry printing 2006-08-06 15:59:26 -05:00
scsi_sas_internal.h [SCSI] scsi_transport_sas: introduce a sas_port entity 2006-06-28 12:40:54 -04:00
scsi_scan.c [SCSI] Fix refcount breakage with 'echo "1" > scan' when target already present 2006-09-07 10:08:43 -05:00
scsi_sysctl.c
scsi_sysfs.c Remove obsolete #include <linux/config.h> 2006-06-30 19:25:36 +02:00
scsi_transport_api.h
scsi_transport_fc.c [SCSI] scsi_transport_fc: fixup netlink arguments 2006-09-23 22:07:20 -05:00
scsi_transport_iscsi.c [SCSI] iscsi class: update version 2006-09-02 13:37:43 -05:00
scsi_transport_sas.c [SCSI] scsi_transport_sas: make minimum and maximum linkrate settable quantities 2006-09-07 15:16:44 -05:00
scsi_transport_spi.c [SCSI] SPI transport class: misc DV fixes 2006-09-23 20:53:53 -05:00
scsi_typedefs.h
scsi.c Merge master.kernel.org:/pub/scm/linux/kernel/git/jejb/scsi-misc-2.6 2006-10-04 18:57:35 -07:00
scsi.h [SCSI] remove unnecessary includes of linux/config.h from drivers/scsi/ 2006-08-19 13:39:11 -07:00
scsicam.c
sd.c Merge master.kernel.org:/pub/scm/linux/kernel/git/jejb/scsi-misc-2.6 2006-10-04 18:57:35 -07:00
seagate.c IRQ: Maintain regs pointer globally rather than passing to IRQ handlers 2006-10-05 15:10:12 +01:00
sg.c [SCSI] sg: fixes for large page_size 2006-09-26 09:23:15 -07:00
sgiwd93.c IRQ: Maintain regs pointer globally rather than passing to IRQ handlers 2006-10-05 15:10:12 +01:00
sim710.c [PATCH] EISA bus MODALIAS attributes support 2006-09-27 08:26:19 -07:00
sr_ioctl.c
sr_vendor.c Remove obsolete #include <linux/config.h> 2006-06-30 19:25:36 +02:00
sr.c [SCSI] hide EH backup data outside the scsi_cmnd 2006-07-09 11:56:44 -05:00
sr.h
st_options.h
st.c [SCSI] SCSI st: fix error handling in module init, sysfs 2006-10-04 13:16:29 -05:00
st.h [SCSI] st: remove unused st_buffer.in_use 2006-06-29 11:06:30 -04:00
stex.c IRQ: Maintain regs pointer globally rather than passing to IRQ handlers 2006-10-05 15:10:12 +01:00
sun3_NCR5380.c IRQ: Maintain regs pointer globally rather than passing to IRQ handlers 2006-10-05 15:10:12 +01:00
sun3_scsi_vme.c IRQ: Maintain regs pointer globally rather than passing to IRQ handlers 2006-10-05 15:10:12 +01:00
sun3_scsi.c IRQ: Maintain regs pointer globally rather than passing to IRQ handlers 2006-10-05 15:10:12 +01:00
sun3_scsi.h
sun3x_esp.c [SCSI] More buffer->request_buffer changes 2006-07-14 09:41:13 -05:00
sym53c416.c IRQ: Maintain regs pointer globally rather than passing to IRQ handlers 2006-10-05 15:10:12 +01:00
sym53c416.h
t128.c [PATCH] irq-flags: scsi: Use the new IRQF_ constants 2006-07-02 13:58:53 -07:00
t128.h
tmscsim.c IRQ: Maintain regs pointer globally rather than passing to IRQ handlers 2006-10-05 15:10:12 +01:00
tmscsim.h Remove obsolete #include <linux/config.h> 2006-06-30 19:25:36 +02:00
u14-34f.c IRQ: Maintain regs pointer globally rather than passing to IRQ handlers 2006-10-05 15:10:12 +01:00
ultrastor.c IRQ: Maintain regs pointer globally rather than passing to IRQ handlers 2006-10-05 15:10:12 +01:00
ultrastor.h [SCSI] scsi-driver ultrastore replace Scsi_Cmnd with struct scsi_cmnd 2006-09-07 12:39:34 -05:00
wd33c93.c [SCSI] More buffer->request_buffer changes 2006-07-14 09:41:13 -05:00
wd33c93.h Remove obsolete #include <linux/config.h> 2006-06-30 19:25:36 +02:00
wd7000.c IRQ: Maintain regs pointer globally rather than passing to IRQ handlers 2006-10-05 15:10:12 +01:00
zalon.c [PATCH] irq-flags: scsi: Use the new IRQF_ constants 2006-07-02 13:58:53 -07:00