linux/arch/powerpc
Ioan Nicu 31d1e130f4 rapidio: remove global irq spinlocks from the subsystem
Locking of config and doorbell operations should be done only if the
underlying hardware requires it.

This patch removes the global spinlocks from the rapidio subsystem and
moves them to the mport drivers (fsl_rio and tsi721), only to the
necessary places.  For example, local config space read and write
operations (lcread/lcwrite) are atomic in all existing drivers, so there
should be no need for locking, while the cread/cwrite operations which
generate maintenance transactions need to be synchronized with a lock.

Later, each driver could chose to use a per-port lock instead of a
global one, or even more granular locking.

Link: http://lkml.kernel.org/r/20170824113023.GD50104@nokia.com
Signed-off-by: Ioan Nicu <ioan.nicu.ext@nokia.com>
Signed-off-by: Frank Kunz <frank.kunz@nokia.com>
Acked-by: Alexandre Bounine <alexandre.bounine@idt.com>
Cc: Matt Porter <mporter@kernel.crashing.org>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Nicholas Piggin <npiggin@gmail.com>
Cc: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2017-10-03 17:54:24 -07:00
..
boot powerpc: conditionally compile platform-specific serial drivers 2017-08-31 14:26:48 +10:00
configs powerpc/configs: Update for CONFIG_SND changes 2017-09-20 13:30:09 +10:00
crypto Merge branch 'linus' of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6 2017-05-02 15:53:46 -07:00
include Merge branch 'akpm' (patches from Andrew) 2017-09-09 10:30:07 -07:00
kernel powerpc/eeh: Create PHB PEs after EEH is initialized 2017-09-21 14:56:00 +10:00
kvm KVM: PPC: Book3S HV: Check for updated HDSISR on P9 HDSI exception 2017-09-22 10:45:46 +02:00
lib powerpc/sstep: mullw should calculate a 64 bit signed result 2017-09-20 13:30:09 +10:00
math-emu Replace <asm/uaccess.h> with <linux/uaccess.h> globally 2016-12-24 11:46:01 -08:00
mm powerpc/mm: Use seq_putc() in two functions 2017-09-01 16:42:52 +10:00
net powerpc updates for 4.14 2017-09-07 10:15:40 -07:00
oprofile ktime: Cleanup ktime_set() usage 2016-12-25 17:21:22 +01:00
perf powerpc/sysrq: Fix oops whem ppmu is not registered 2017-09-20 13:30:09 +10:00
platforms powerpc/pseries: Fix parent_dn reference leak in add_dt_node() 2017-09-21 19:33:16 +10:00
purgatory powerpc/asm: Convert .llong directives to .8byte 2017-08-31 14:26:47 +10:00
sysdev rapidio: remove global irq spinlocks from the subsystem 2017-10-03 17:54:24 -07:00
tools powerpc/64: Tool to check head sections location sanity 2017-05-30 14:59:51 +10:00
xmon powerpc/xmon: Add ISA v3.0 SPRs to SPR dump 2017-08-31 14:26:45 +10:00
Kconfig powerpc updates for 4.14 2017-09-07 10:15:40 -07:00
Kconfig.debug powerpc/xmon: Enable disassembly files (compilation changes) 2017-02-15 20:02:42 +11:00
Makefile Merge branch 'fixes' into next 2017-08-23 22:20:10 +10:00
Makefile.postlink powerpc/64: Tool to check head sections location sanity 2017-05-30 14:59:51 +10:00