2009-09-01 06:08:13 +08:00
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/* leon_smp.c: Sparc-Leon SMP support.
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*
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* based on sun4m_smp.c
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* Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu)
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* Copyright (C) 2009 Daniel Hellstrom (daniel@gaisler.com) Aeroflex Gaisler AB
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* Copyright (C) 2009 Konrad Eisele (konrad@gaisler.com) Aeroflex Gaisler AB
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*/
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#include <asm/head.h>
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#include <linux/kernel.h>
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#include <linux/sched.h>
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#include <linux/threads.h>
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#include <linux/smp.h>
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#include <linux/interrupt.h>
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#include <linux/kernel_stat.h>
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2011-05-02 08:08:52 +08:00
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#include <linux/of.h>
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2009-09-01 06:08:13 +08:00
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#include <linux/init.h>
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#include <linux/spinlock.h>
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#include <linux/mm.h>
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#include <linux/swap.h>
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#include <linux/profile.h>
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#include <linux/pm.h>
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#include <linux/delay.h>
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include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h
percpu.h is included by sched.h and module.h and thus ends up being
included when building most .c files. percpu.h includes slab.h which
in turn includes gfp.h making everything defined by the two files
universally available and complicating inclusion dependencies.
percpu.h -> slab.h dependency is about to be removed. Prepare for
this change by updating users of gfp and slab facilities include those
headers directly instead of assuming availability. As this conversion
needs to touch large number of source files, the following script is
used as the basis of conversion.
http://userweb.kernel.org/~tj/misc/slabh-sweep.py
The script does the followings.
* Scan files for gfp and slab usages and update includes such that
only the necessary includes are there. ie. if only gfp is used,
gfp.h, if slab is used, slab.h.
* When the script inserts a new include, it looks at the include
blocks and try to put the new include such that its order conforms
to its surrounding. It's put in the include block which contains
core kernel includes, in the same order that the rest are ordered -
alphabetical, Christmas tree, rev-Xmas-tree or at the end if there
doesn't seem to be any matching order.
* If the script can't find a place to put a new include (mostly
because the file doesn't have fitting include block), it prints out
an error message indicating which .h file needs to be added to the
file.
The conversion was done in the following steps.
1. The initial automatic conversion of all .c files updated slightly
over 4000 files, deleting around 700 includes and adding ~480 gfp.h
and ~3000 slab.h inclusions. The script emitted errors for ~400
files.
2. Each error was manually checked. Some didn't need the inclusion,
some needed manual addition while adding it to implementation .h or
embedding .c file was more appropriate for others. This step added
inclusions to around 150 files.
3. The script was run again and the output was compared to the edits
from #2 to make sure no file was left behind.
4. Several build tests were done and a couple of problems were fixed.
e.g. lib/decompress_*.c used malloc/free() wrappers around slab
APIs requiring slab.h to be added manually.
5. The script was run on all .h files but without automatically
editing them as sprinkling gfp.h and slab.h inclusions around .h
files could easily lead to inclusion dependency hell. Most gfp.h
inclusion directives were ignored as stuff from gfp.h was usually
wildly available and often used in preprocessor macros. Each
slab.h inclusion directive was examined and added manually as
necessary.
6. percpu.h was updated not to include slab.h.
7. Build test were done on the following configurations and failures
were fixed. CONFIG_GCOV_KERNEL was turned off for all tests (as my
distributed build env didn't work with gcov compiles) and a few
more options had to be turned off depending on archs to make things
build (like ipr on powerpc/64 which failed due to missing writeq).
* x86 and x86_64 UP and SMP allmodconfig and a custom test config.
* powerpc and powerpc64 SMP allmodconfig
* sparc and sparc64 SMP allmodconfig
* ia64 SMP allmodconfig
* s390 SMP allmodconfig
* alpha SMP allmodconfig
* um on x86_64 SMP allmodconfig
8. percpu.h modifications were reverted so that it could be applied as
a separate patch and serve as bisection point.
Given the fact that I had only a couple of failures from tests on step
6, I'm fairly confident about the coverage of this conversion patch.
If there is a breakage, it's likely to be something in one of the arch
headers which should be easily discoverable easily on most builds of
the specific arch.
Signed-off-by: Tejun Heo <tj@kernel.org>
Guess-its-ok-by: Christoph Lameter <cl@linux-foundation.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
2010-03-24 16:04:11 +08:00
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#include <linux/gfp.h>
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2012-04-05 03:49:26 +08:00
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#include <linux/cpu.h>
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#include <linux/clockchips.h>
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2009-09-01 06:08:13 +08:00
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#include <asm/cacheflush.h>
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#include <asm/tlbflush.h>
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#include <asm/ptrace.h>
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2011-07-27 07:09:06 +08:00
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#include <linux/atomic.h>
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2009-09-01 06:08:13 +08:00
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#include <asm/irq_regs.h>
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2011-05-02 08:08:52 +08:00
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#include <asm/traps.h>
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2009-09-01 06:08:13 +08:00
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#include <asm/delay.h>
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#include <asm/irq.h>
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#include <asm/page.h>
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#include <asm/pgalloc.h>
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#include <asm/pgtable.h>
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#include <asm/oplib.h>
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#include <asm/cpudata.h>
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#include <asm/asi.h>
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#include <asm/leon.h>
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#include <asm/leon_amba.h>
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2012-04-05 03:49:26 +08:00
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#include <asm/timer.h>
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2009-09-01 06:08:13 +08:00
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2011-02-26 14:59:20 +08:00
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#include "kernel.h"
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2009-09-01 06:08:13 +08:00
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#include "irq.h"
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extern ctxd_t *srmmu_ctx_table_phys;
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static int smp_processors_ready;
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extern volatile unsigned long cpu_callin_map[NR_CPUS];
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extern cpumask_t smp_commenced_mask;
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sparc: delete __cpuinit/__CPUINIT usage from all users
The __cpuinit type of throwaway sections might have made sense
some time ago when RAM was more constrained, but now the savings
do not offset the cost and complications. For example, the fix in
commit 5e427ec2d0 ("x86: Fix bit corruption at CPU resume time")
is a good example of the nasty type of bugs that can be created
with improper use of the various __init prefixes.
After a discussion on LKML[1] it was decided that cpuinit should go
the way of devinit and be phased out. Once all the users are gone,
we can then finally remove the macros themselves from linux/init.h.
Note that some harmless section mismatch warnings may result, since
notify_cpu_starting() and cpu_up() are arch independent (kernel/cpu.c)
are flagged as __cpuinit -- so if we remove the __cpuinit from
arch specific callers, we will also get section mismatch warnings.
As an intermediate step, we intend to turn the linux/init.h cpuinit
content into no-ops as early as possible, since that will get rid
of these warnings. In any case, they are temporary and harmless.
This removes all the arch/sparc uses of the __cpuinit macros from
C files and removes __CPUINIT from assembly files. Note that even
though arch/sparc/kernel/trampoline_64.S has instances of ".previous"
in it, they are all paired off against explicit ".section" directives,
and not implicitly paired with __CPUINIT (unlike mips and arm were).
[1] https://lkml.org/lkml/2013/5/20/589
Cc: "David S. Miller" <davem@davemloft.net>
Cc: sparclinux@vger.kernel.org
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
2013-06-18 03:43:14 +08:00
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void leon_configure_cache_smp(void);
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2011-05-02 08:08:52 +08:00
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static void leon_ipi_init(void);
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/* IRQ number of LEON IPIs */
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int leon_ipi_irq = LEON3_IRQ_IPI_DEFAULT;
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2009-09-01 06:08:13 +08:00
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static inline unsigned long do_swap(volatile unsigned long *ptr,
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unsigned long val)
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{
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2010-10-26 05:23:46 +08:00
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__asm__ __volatile__("swapa [%2] %3, %0\n\t" : "=&r"(val)
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: "0"(val), "r"(ptr), "i"(ASI_LEON_DCACHE_MISS)
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2009-09-01 06:08:13 +08:00
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: "memory");
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return val;
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}
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sparc: delete __cpuinit/__CPUINIT usage from all users
The __cpuinit type of throwaway sections might have made sense
some time ago when RAM was more constrained, but now the savings
do not offset the cost and complications. For example, the fix in
commit 5e427ec2d0 ("x86: Fix bit corruption at CPU resume time")
is a good example of the nasty type of bugs that can be created
with improper use of the various __init prefixes.
After a discussion on LKML[1] it was decided that cpuinit should go
the way of devinit and be phased out. Once all the users are gone,
we can then finally remove the macros themselves from linux/init.h.
Note that some harmless section mismatch warnings may result, since
notify_cpu_starting() and cpu_up() are arch independent (kernel/cpu.c)
are flagged as __cpuinit -- so if we remove the __cpuinit from
arch specific callers, we will also get section mismatch warnings.
As an intermediate step, we intend to turn the linux/init.h cpuinit
content into no-ops as early as possible, since that will get rid
of these warnings. In any case, they are temporary and harmless.
This removes all the arch/sparc uses of the __cpuinit macros from
C files and removes __CPUINIT from assembly files. Note that even
though arch/sparc/kernel/trampoline_64.S has instances of ".previous"
in it, they are all paired off against explicit ".section" directives,
and not implicitly paired with __CPUINIT (unlike mips and arm were).
[1] https://lkml.org/lkml/2013/5/20/589
Cc: "David S. Miller" <davem@davemloft.net>
Cc: sparclinux@vger.kernel.org
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
2013-06-18 03:43:14 +08:00
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void leon_cpu_pre_starting(void *arg)
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2009-09-01 06:08:13 +08:00
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{
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leon_configure_cache_smp();
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2013-02-15 22:52:06 +08:00
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}
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2009-09-01 06:08:13 +08:00
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sparc: delete __cpuinit/__CPUINIT usage from all users
The __cpuinit type of throwaway sections might have made sense
some time ago when RAM was more constrained, but now the savings
do not offset the cost and complications. For example, the fix in
commit 5e427ec2d0 ("x86: Fix bit corruption at CPU resume time")
is a good example of the nasty type of bugs that can be created
with improper use of the various __init prefixes.
After a discussion on LKML[1] it was decided that cpuinit should go
the way of devinit and be phased out. Once all the users are gone,
we can then finally remove the macros themselves from linux/init.h.
Note that some harmless section mismatch warnings may result, since
notify_cpu_starting() and cpu_up() are arch independent (kernel/cpu.c)
are flagged as __cpuinit -- so if we remove the __cpuinit from
arch specific callers, we will also get section mismatch warnings.
As an intermediate step, we intend to turn the linux/init.h cpuinit
content into no-ops as early as possible, since that will get rid
of these warnings. In any case, they are temporary and harmless.
This removes all the arch/sparc uses of the __cpuinit macros from
C files and removes __CPUINIT from assembly files. Note that even
though arch/sparc/kernel/trampoline_64.S has instances of ".previous"
in it, they are all paired off against explicit ".section" directives,
and not implicitly paired with __CPUINIT (unlike mips and arm were).
[1] https://lkml.org/lkml/2013/5/20/589
Cc: "David S. Miller" <davem@davemloft.net>
Cc: sparclinux@vger.kernel.org
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
2013-06-18 03:43:14 +08:00
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void leon_cpu_pre_online(void *arg)
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2013-02-15 22:52:06 +08:00
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{
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int cpuid = hard_smp_processor_id();
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2009-09-01 06:08:13 +08:00
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2013-02-15 22:52:06 +08:00
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/* Allow master to continue. The master will then give us the
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* go-ahead by setting the smp_commenced_mask and will wait without
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* timeouts until our setup is completed fully (signified by
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* our bit being set in the cpu_online_mask).
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2009-09-01 06:08:13 +08:00
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*/
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do_swap(&cpu_callin_map[cpuid], 1);
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2012-05-14 11:49:31 +08:00
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local_ops->cache_all();
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local_ops->tlb_all();
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2009-09-01 06:08:13 +08:00
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/* Fix idle thread fields. */
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__asm__ __volatile__("ld [%0], %%g6\n\t" : : "r"(¤t_set[cpuid])
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: "memory" /* paranoid */);
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/* Attach to the address space of init_task. */
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2017-02-28 06:30:07 +08:00
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mmgrab(&init_mm);
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2009-09-01 06:08:13 +08:00
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current->active_mm = &init_mm;
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2011-05-17 04:38:07 +08:00
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while (!cpumask_test_cpu(cpuid, &smp_commenced_mask))
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2009-09-01 06:08:13 +08:00
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mb();
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}
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/*
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* Cycle through the processors asking the PROM to start each one.
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*/
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extern struct linux_prom_registers smp_penguin_ctable;
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|
sparc: delete __cpuinit/__CPUINIT usage from all users
The __cpuinit type of throwaway sections might have made sense
some time ago when RAM was more constrained, but now the savings
do not offset the cost and complications. For example, the fix in
commit 5e427ec2d0 ("x86: Fix bit corruption at CPU resume time")
is a good example of the nasty type of bugs that can be created
with improper use of the various __init prefixes.
After a discussion on LKML[1] it was decided that cpuinit should go
the way of devinit and be phased out. Once all the users are gone,
we can then finally remove the macros themselves from linux/init.h.
Note that some harmless section mismatch warnings may result, since
notify_cpu_starting() and cpu_up() are arch independent (kernel/cpu.c)
are flagged as __cpuinit -- so if we remove the __cpuinit from
arch specific callers, we will also get section mismatch warnings.
As an intermediate step, we intend to turn the linux/init.h cpuinit
content into no-ops as early as possible, since that will get rid
of these warnings. In any case, they are temporary and harmless.
This removes all the arch/sparc uses of the __cpuinit macros from
C files and removes __CPUINIT from assembly files. Note that even
though arch/sparc/kernel/trampoline_64.S has instances of ".previous"
in it, they are all paired off against explicit ".section" directives,
and not implicitly paired with __CPUINIT (unlike mips and arm were).
[1] https://lkml.org/lkml/2013/5/20/589
Cc: "David S. Miller" <davem@davemloft.net>
Cc: sparclinux@vger.kernel.org
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
2013-06-18 03:43:14 +08:00
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void leon_configure_cache_smp(void)
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2009-09-01 06:08:13 +08:00
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{
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unsigned long cfg = sparc_leon3_get_dcachecfg();
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int me = smp_processor_id();
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if (ASI_LEON3_SYSCTRL_CFG_SSIZE(cfg) > 4) {
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printk(KERN_INFO "Note: SMP with snooping only works on 4k cache, found %dk(0x%x) on cpu %d, disabling caches\n",
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(unsigned int)ASI_LEON3_SYSCTRL_CFG_SSIZE(cfg),
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(unsigned int)cfg, (unsigned int)me);
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sparc_leon3_disable_cache();
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} else {
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if (cfg & ASI_LEON3_SYSCTRL_CFG_SNOOPING) {
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sparc_leon3_enable_snooping();
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} else {
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printk(KERN_INFO "Note: You have to enable snooping in the vhdl model cpu %d, disabling caches\n",
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me);
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sparc_leon3_disable_cache();
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}
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}
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2012-05-14 11:49:31 +08:00
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local_ops->cache_all();
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local_ops->tlb_all();
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2009-09-01 06:08:13 +08:00
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}
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2014-04-22 03:39:44 +08:00
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static void leon_smp_setbroadcast(unsigned int mask)
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2009-09-01 06:08:13 +08:00
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{
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int broadcast =
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((LEON3_BYPASS_LOAD_PA(&(leon3_irqctrl_regs->mpstatus)) >>
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LEON3_IRQMPSTATUS_BROADCAST) & 1);
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if (!broadcast) {
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prom_printf("######## !!!! The irqmp-ctrl must have broadcast enabled, smp wont work !!!!! ####### nr cpus: %d\n",
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leon_smp_nrcpus());
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if (leon_smp_nrcpus() > 1) {
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BUG();
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} else {
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prom_printf("continue anyway\n");
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return;
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}
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}
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LEON_BYPASS_STORE_PA(&(leon3_irqctrl_regs->mpbroadcast), mask);
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}
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int leon_smp_nrcpus(void)
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{
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int nrcpu =
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((LEON3_BYPASS_LOAD_PA(&(leon3_irqctrl_regs->mpstatus)) >>
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LEON3_IRQMPSTATUS_CPUNR) & 0xf) + 1;
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return nrcpu;
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}
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void __init leon_boot_cpus(void)
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{
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int nrcpu = leon_smp_nrcpus();
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int me = smp_processor_id();
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|
2011-05-02 08:08:52 +08:00
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/* Setup IPI */
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leon_ipi_init();
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2010-02-13 04:08:51 +08:00
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printk(KERN_INFO "%d:(%d:%d) cpus mpirq at 0x%x\n", (unsigned int)me,
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2009-09-01 06:08:13 +08:00
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(unsigned int)nrcpu, (unsigned int)NR_CPUS,
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(unsigned int)&(leon3_irqctrl_regs->mpstatus));
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leon_enable_irq_cpu(LEON3_IRQ_CROSS_CALL, me);
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leon_enable_irq_cpu(LEON3_IRQ_TICKER, me);
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2011-05-02 08:08:52 +08:00
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leon_enable_irq_cpu(leon_ipi_irq, me);
|
2009-09-01 06:08:13 +08:00
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leon_smp_setbroadcast(1 << LEON3_IRQ_TICKER);
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leon_configure_cache_smp();
|
2012-05-14 11:49:31 +08:00
|
|
|
local_ops->cache_all();
|
2009-09-01 06:08:13 +08:00
|
|
|
|
|
|
|
|
}
|
|
|
|
|
|
sparc: delete __cpuinit/__CPUINIT usage from all users
The __cpuinit type of throwaway sections might have made sense
some time ago when RAM was more constrained, but now the savings
do not offset the cost and complications. For example, the fix in
commit 5e427ec2d0 ("x86: Fix bit corruption at CPU resume time")
is a good example of the nasty type of bugs that can be created
with improper use of the various __init prefixes.
After a discussion on LKML[1] it was decided that cpuinit should go
the way of devinit and be phased out. Once all the users are gone,
we can then finally remove the macros themselves from linux/init.h.
Note that some harmless section mismatch warnings may result, since
notify_cpu_starting() and cpu_up() are arch independent (kernel/cpu.c)
are flagged as __cpuinit -- so if we remove the __cpuinit from
arch specific callers, we will also get section mismatch warnings.
As an intermediate step, we intend to turn the linux/init.h cpuinit
content into no-ops as early as possible, since that will get rid
of these warnings. In any case, they are temporary and harmless.
This removes all the arch/sparc uses of the __cpuinit macros from
C files and removes __CPUINIT from assembly files. Note that even
though arch/sparc/kernel/trampoline_64.S has instances of ".previous"
in it, they are all paired off against explicit ".section" directives,
and not implicitly paired with __CPUINIT (unlike mips and arm were).
[1] https://lkml.org/lkml/2013/5/20/589
Cc: "David S. Miller" <davem@davemloft.net>
Cc: sparclinux@vger.kernel.org
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
2013-06-18 03:43:14 +08:00
|
|
|
int leon_boot_one_cpu(int i, struct task_struct *idle)
|
2009-09-01 06:08:13 +08:00
|
|
|
{
|
|
|
|
|
int timeout;
|
|
|
|
|
|
2012-04-20 21:05:56 +08:00
|
|
|
current_set[i] = task_thread_info(idle);
|
2009-09-01 06:08:13 +08:00
|
|
|
|
|
|
|
|
/* See trampoline.S:leon_smp_cpu_startup for details...
|
|
|
|
|
* Initialize the contexts table
|
|
|
|
|
* Since the call to prom_startcpu() trashes the structure,
|
|
|
|
|
* we need to re-initialize it for each cpu
|
|
|
|
|
*/
|
|
|
|
|
smp_penguin_ctable.which_io = 0;
|
|
|
|
|
smp_penguin_ctable.phys_addr = (unsigned int)srmmu_ctx_table_phys;
|
|
|
|
|
smp_penguin_ctable.reg_size = 0;
|
|
|
|
|
|
|
|
|
|
/* whirrr, whirrr, whirrrrrrrrr... */
|
|
|
|
|
printk(KERN_INFO "Starting CPU %d : (irqmp: 0x%x)\n", (unsigned int)i,
|
|
|
|
|
(unsigned int)&leon3_irqctrl_regs->mpstatus);
|
2012-05-14 11:49:31 +08:00
|
|
|
local_ops->cache_all();
|
2009-09-01 06:08:13 +08:00
|
|
|
|
2011-04-21 12:20:25 +08:00
|
|
|
/* Make sure all IRQs are of from the start for this new CPU */
|
|
|
|
|
LEON_BYPASS_STORE_PA(&leon3_irqctrl_regs->mask[i], 0);
|
|
|
|
|
|
|
|
|
|
/* Wake one CPU */
|
2009-09-01 06:08:13 +08:00
|
|
|
LEON_BYPASS_STORE_PA(&(leon3_irqctrl_regs->mpstatus), 1 << i);
|
|
|
|
|
|
|
|
|
|
/* wheee... it's going... */
|
|
|
|
|
for (timeout = 0; timeout < 10000; timeout++) {
|
|
|
|
|
if (cpu_callin_map[i])
|
|
|
|
|
break;
|
|
|
|
|
udelay(200);
|
|
|
|
|
}
|
2010-02-13 04:08:51 +08:00
|
|
|
printk(KERN_INFO "Started CPU %d\n", (unsigned int)i);
|
2009-09-01 06:08:13 +08:00
|
|
|
|
|
|
|
|
if (!(cpu_callin_map[i])) {
|
|
|
|
|
printk(KERN_ERR "Processor %d is stuck.\n", i);
|
|
|
|
|
return -ENODEV;
|
|
|
|
|
} else {
|
|
|
|
|
leon_enable_irq_cpu(LEON3_IRQ_CROSS_CALL, i);
|
|
|
|
|
leon_enable_irq_cpu(LEON3_IRQ_TICKER, i);
|
2011-05-02 08:08:52 +08:00
|
|
|
leon_enable_irq_cpu(leon_ipi_irq, i);
|
2009-09-01 06:08:13 +08:00
|
|
|
}
|
|
|
|
|
|
2012-05-14 11:49:31 +08:00
|
|
|
local_ops->cache_all();
|
2009-09-01 06:08:13 +08:00
|
|
|
return 0;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
void __init leon_smp_done(void)
|
|
|
|
|
{
|
|
|
|
|
|
|
|
|
|
int i, first;
|
|
|
|
|
int *prev;
|
|
|
|
|
|
|
|
|
|
/* setup cpu list for irq rotation */
|
|
|
|
|
first = 0;
|
|
|
|
|
prev = &first;
|
|
|
|
|
for (i = 0; i < NR_CPUS; i++) {
|
|
|
|
|
if (cpu_online(i)) {
|
|
|
|
|
*prev = i;
|
|
|
|
|
prev = &cpu_data(i).next;
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
*prev = first;
|
2012-05-14 11:49:31 +08:00
|
|
|
local_ops->cache_all();
|
2009-09-01 06:08:13 +08:00
|
|
|
|
|
|
|
|
/* Free unneeded trap tables */
|
2011-05-17 04:38:07 +08:00
|
|
|
if (!cpu_present(1)) {
|
2013-05-08 07:18:08 +08:00
|
|
|
free_reserved_page(virt_to_page(&trapbase_cpu1));
|
2009-09-01 06:08:13 +08:00
|
|
|
}
|
2011-05-17 04:38:07 +08:00
|
|
|
if (!cpu_present(2)) {
|
2013-05-08 07:18:08 +08:00
|
|
|
free_reserved_page(virt_to_page(&trapbase_cpu2));
|
2009-09-01 06:08:13 +08:00
|
|
|
}
|
2011-05-17 04:38:07 +08:00
|
|
|
if (!cpu_present(3)) {
|
2013-05-08 07:18:08 +08:00
|
|
|
free_reserved_page(virt_to_page(&trapbase_cpu3));
|
2009-09-01 06:08:13 +08:00
|
|
|
}
|
|
|
|
|
/* Ok, they are spinning and ready to go. */
|
|
|
|
|
smp_processors_ready = 1;
|
|
|
|
|
|
|
|
|
|
}
|
|
|
|
|
|
2011-05-02 08:08:52 +08:00
|
|
|
struct leon_ipi_work {
|
|
|
|
|
int single;
|
|
|
|
|
int msk;
|
|
|
|
|
int resched;
|
|
|
|
|
};
|
|
|
|
|
|
|
|
|
|
static DEFINE_PER_CPU_SHARED_ALIGNED(struct leon_ipi_work, leon_ipi_work);
|
|
|
|
|
|
|
|
|
|
/* Initialize IPIs on the LEON, in order to save IRQ resources only one IRQ
|
|
|
|
|
* is used for all three types of IPIs.
|
|
|
|
|
*/
|
|
|
|
|
static void __init leon_ipi_init(void)
|
|
|
|
|
{
|
|
|
|
|
int cpu, len;
|
|
|
|
|
struct leon_ipi_work *work;
|
|
|
|
|
struct property *pp;
|
|
|
|
|
struct device_node *rootnp;
|
|
|
|
|
struct tt_entry *trap_table;
|
|
|
|
|
unsigned long flags;
|
|
|
|
|
|
|
|
|
|
/* Find IPI IRQ or stick with default value */
|
|
|
|
|
rootnp = of_find_node_by_path("/ambapp0");
|
|
|
|
|
if (rootnp) {
|
|
|
|
|
pp = of_find_property(rootnp, "ipi_num", &len);
|
|
|
|
|
if (pp && (*(int *)pp->value))
|
|
|
|
|
leon_ipi_irq = *(int *)pp->value;
|
|
|
|
|
}
|
|
|
|
|
printk(KERN_INFO "leon: SMP IPIs at IRQ %d\n", leon_ipi_irq);
|
|
|
|
|
|
|
|
|
|
/* Adjust so that we jump directly to smpleon_ipi */
|
|
|
|
|
local_irq_save(flags);
|
|
|
|
|
trap_table = &sparc_ttable[SP_TRAP_IRQ1 + (leon_ipi_irq - 1)];
|
|
|
|
|
trap_table->inst_three += smpleon_ipi - real_irq_entry;
|
2012-05-14 11:49:31 +08:00
|
|
|
local_ops->cache_all();
|
2011-05-02 08:08:52 +08:00
|
|
|
local_irq_restore(flags);
|
|
|
|
|
|
|
|
|
|
for_each_possible_cpu(cpu) {
|
|
|
|
|
work = &per_cpu(leon_ipi_work, cpu);
|
|
|
|
|
work->single = work->msk = work->resched = 0;
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
|
2012-05-14 21:14:36 +08:00
|
|
|
static void leon_send_ipi(int cpu, int level)
|
|
|
|
|
{
|
|
|
|
|
unsigned long mask;
|
|
|
|
|
mask = leon_get_irqmask(level);
|
|
|
|
|
LEON3_BYPASS_STORE_PA(&leon3_irqctrl_regs->force[cpu], mask);
|
|
|
|
|
}
|
|
|
|
|
|
2011-05-02 08:08:52 +08:00
|
|
|
static void leon_ipi_single(int cpu)
|
|
|
|
|
{
|
|
|
|
|
struct leon_ipi_work *work = &per_cpu(leon_ipi_work, cpu);
|
|
|
|
|
|
|
|
|
|
/* Mark work */
|
|
|
|
|
work->single = 1;
|
|
|
|
|
|
|
|
|
|
/* Generate IRQ on the CPU */
|
2012-05-14 21:14:36 +08:00
|
|
|
leon_send_ipi(cpu, leon_ipi_irq);
|
2011-05-02 08:08:52 +08:00
|
|
|
}
|
|
|
|
|
|
|
|
|
|
static void leon_ipi_mask_one(int cpu)
|
|
|
|
|
{
|
|
|
|
|
struct leon_ipi_work *work = &per_cpu(leon_ipi_work, cpu);
|
|
|
|
|
|
|
|
|
|
/* Mark work */
|
|
|
|
|
work->msk = 1;
|
|
|
|
|
|
|
|
|
|
/* Generate IRQ on the CPU */
|
2012-05-14 21:14:36 +08:00
|
|
|
leon_send_ipi(cpu, leon_ipi_irq);
|
2011-05-02 08:08:52 +08:00
|
|
|
}
|
|
|
|
|
|
|
|
|
|
static void leon_ipi_resched(int cpu)
|
|
|
|
|
{
|
|
|
|
|
struct leon_ipi_work *work = &per_cpu(leon_ipi_work, cpu);
|
|
|
|
|
|
|
|
|
|
/* Mark work */
|
|
|
|
|
work->resched = 1;
|
|
|
|
|
|
|
|
|
|
/* Generate IRQ on the CPU (any IRQ will cause resched) */
|
2012-05-14 21:14:36 +08:00
|
|
|
leon_send_ipi(cpu, leon_ipi_irq);
|
2011-05-02 08:08:52 +08:00
|
|
|
}
|
|
|
|
|
|
|
|
|
|
void leonsmp_ipi_interrupt(void)
|
|
|
|
|
{
|
sparc: Replace __get_cpu_var uses
__get_cpu_var() is used for multiple purposes in the kernel source. One of
them is address calculation via the form &__get_cpu_var(x). This calculates
the address for the instance of the percpu variable of the current processor
based on an offset.
Other use cases are for storing and retrieving data from the current
processors percpu area. __get_cpu_var() can be used as an lvalue when
writing data or on the right side of an assignment.
__get_cpu_var() is defined as :
#define __get_cpu_var(var) (*this_cpu_ptr(&(var)))
__get_cpu_var() always only does an address determination. However, store
and retrieve operations could use a segment prefix (or global register on
other platforms) to avoid the address calculation.
this_cpu_write() and this_cpu_read() can directly take an offset into a
percpu area and use optimized assembly code to read and write per cpu
variables.
This patch converts __get_cpu_var into either an explicit address
calculation using this_cpu_ptr() or into a use of this_cpu operations that
use the offset. Thereby address calculations are avoided and less registers
are used when code is generated.
At the end of the patch set all uses of __get_cpu_var have been removed so
the macro is removed too.
The patch set includes passes over all arches as well. Once these operations
are used throughout then specialized macros can be defined in non -x86
arches as well in order to optimize per cpu access by f.e. using a global
register that may be set to the per cpu base.
Transformations done to __get_cpu_var()
1. Determine the address of the percpu instance of the current processor.
DEFINE_PER_CPU(int, y);
int *x = &__get_cpu_var(y);
Converts to
int *x = this_cpu_ptr(&y);
2. Same as #1 but this time an array structure is involved.
DEFINE_PER_CPU(int, y[20]);
int *x = __get_cpu_var(y);
Converts to
int *x = this_cpu_ptr(y);
3. Retrieve the content of the current processors instance of a per cpu
variable.
DEFINE_PER_CPU(int, y);
int x = __get_cpu_var(y)
Converts to
int x = __this_cpu_read(y);
4. Retrieve the content of a percpu struct
DEFINE_PER_CPU(struct mystruct, y);
struct mystruct x = __get_cpu_var(y);
Converts to
memcpy(&x, this_cpu_ptr(&y), sizeof(x));
5. Assignment to a per cpu variable
DEFINE_PER_CPU(int, y)
__get_cpu_var(y) = x;
Converts to
__this_cpu_write(y, x);
6. Increment/Decrement etc of a per cpu variable
DEFINE_PER_CPU(int, y);
__get_cpu_var(y)++
Converts to
__this_cpu_inc(y)
Cc: sparclinux@vger.kernel.org
Acked-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Christoph Lameter <cl@linux.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
2014-08-18 01:30:54 +08:00
|
|
|
struct leon_ipi_work *work = this_cpu_ptr(&leon_ipi_work);
|
2011-05-02 08:08:52 +08:00
|
|
|
|
|
|
|
|
if (work->single) {
|
|
|
|
|
work->single = 0;
|
|
|
|
|
smp_call_function_single_interrupt();
|
|
|
|
|
}
|
|
|
|
|
if (work->msk) {
|
|
|
|
|
work->msk = 0;
|
|
|
|
|
smp_call_function_interrupt();
|
|
|
|
|
}
|
|
|
|
|
if (work->resched) {
|
|
|
|
|
work->resched = 0;
|
|
|
|
|
smp_resched_interrupt();
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
|
2009-09-01 06:08:13 +08:00
|
|
|
static struct smp_funcall {
|
|
|
|
|
smpfunc_t func;
|
|
|
|
|
unsigned long arg1;
|
|
|
|
|
unsigned long arg2;
|
|
|
|
|
unsigned long arg3;
|
|
|
|
|
unsigned long arg4;
|
|
|
|
|
unsigned long arg5;
|
|
|
|
|
unsigned long processors_in[NR_CPUS]; /* Set when ipi entered. */
|
|
|
|
|
unsigned long processors_out[NR_CPUS]; /* Set when ipi exited. */
|
2014-12-05 17:55:28 +08:00
|
|
|
} ccall_info __attribute__((aligned(8)));
|
2009-09-01 06:08:13 +08:00
|
|
|
|
|
|
|
|
static DEFINE_SPINLOCK(cross_call_lock);
|
|
|
|
|
|
|
|
|
|
/* Cross calls must be serialized, at least currently. */
|
|
|
|
|
static void leon_cross_call(smpfunc_t func, cpumask_t mask, unsigned long arg1,
|
|
|
|
|
unsigned long arg2, unsigned long arg3,
|
|
|
|
|
unsigned long arg4)
|
|
|
|
|
{
|
|
|
|
|
if (smp_processors_ready) {
|
|
|
|
|
register int high = NR_CPUS - 1;
|
|
|
|
|
unsigned long flags;
|
|
|
|
|
|
|
|
|
|
spin_lock_irqsave(&cross_call_lock, flags);
|
|
|
|
|
|
|
|
|
|
{
|
|
|
|
|
/* If you make changes here, make sure gcc generates proper code... */
|
|
|
|
|
register smpfunc_t f asm("i0") = func;
|
|
|
|
|
register unsigned long a1 asm("i1") = arg1;
|
|
|
|
|
register unsigned long a2 asm("i2") = arg2;
|
|
|
|
|
register unsigned long a3 asm("i3") = arg3;
|
|
|
|
|
register unsigned long a4 asm("i4") = arg4;
|
|
|
|
|
register unsigned long a5 asm("i5") = 0;
|
|
|
|
|
|
|
|
|
|
__asm__ __volatile__("std %0, [%6]\n\t"
|
|
|
|
|
"std %2, [%6 + 8]\n\t"
|
|
|
|
|
"std %4, [%6 + 16]\n\t" : :
|
|
|
|
|
"r"(f), "r"(a1), "r"(a2), "r"(a3),
|
|
|
|
|
"r"(a4), "r"(a5),
|
|
|
|
|
"r"(&ccall_info.func));
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/* Init receive/complete mapping, plus fire the IPI's off. */
|
|
|
|
|
{
|
|
|
|
|
register int i;
|
|
|
|
|
|
2011-05-17 04:38:07 +08:00
|
|
|
cpumask_clear_cpu(smp_processor_id(), &mask);
|
|
|
|
|
cpumask_and(&mask, cpu_online_mask, &mask);
|
2009-09-01 06:08:13 +08:00
|
|
|
for (i = 0; i <= high; i++) {
|
2011-05-17 04:38:07 +08:00
|
|
|
if (cpumask_test_cpu(i, &mask)) {
|
2009-09-01 06:08:13 +08:00
|
|
|
ccall_info.processors_in[i] = 0;
|
|
|
|
|
ccall_info.processors_out[i] = 0;
|
2012-05-14 21:14:36 +08:00
|
|
|
leon_send_ipi(i, LEON3_IRQ_CROSS_CALL);
|
2009-09-01 06:08:13 +08:00
|
|
|
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
{
|
|
|
|
|
register int i;
|
|
|
|
|
|
|
|
|
|
i = 0;
|
|
|
|
|
do {
|
2011-05-17 04:38:07 +08:00
|
|
|
if (!cpumask_test_cpu(i, &mask))
|
2009-09-01 06:08:13 +08:00
|
|
|
continue;
|
|
|
|
|
|
|
|
|
|
while (!ccall_info.processors_in[i])
|
|
|
|
|
barrier();
|
|
|
|
|
} while (++i <= high);
|
|
|
|
|
|
|
|
|
|
i = 0;
|
|
|
|
|
do {
|
2011-05-17 04:38:07 +08:00
|
|
|
if (!cpumask_test_cpu(i, &mask))
|
2009-09-01 06:08:13 +08:00
|
|
|
continue;
|
|
|
|
|
|
|
|
|
|
while (!ccall_info.processors_out[i])
|
|
|
|
|
barrier();
|
|
|
|
|
} while (++i <= high);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
spin_unlock_irqrestore(&cross_call_lock, flags);
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/* Running cross calls. */
|
|
|
|
|
void leon_cross_call_irq(void)
|
|
|
|
|
{
|
|
|
|
|
int i = smp_processor_id();
|
|
|
|
|
|
|
|
|
|
ccall_info.processors_in[i] = 1;
|
|
|
|
|
ccall_info.func(ccall_info.arg1, ccall_info.arg2, ccall_info.arg3,
|
|
|
|
|
ccall_info.arg4, ccall_info.arg5);
|
|
|
|
|
ccall_info.processors_out[i] = 1;
|
|
|
|
|
}
|
|
|
|
|
|
2012-05-14 21:14:36 +08:00
|
|
|
static const struct sparc32_ipi_ops leon_ipi_ops = {
|
|
|
|
|
.cross_call = leon_cross_call,
|
|
|
|
|
.resched = leon_ipi_resched,
|
|
|
|
|
.single = leon_ipi_single,
|
|
|
|
|
.mask_one = leon_ipi_mask_one,
|
|
|
|
|
};
|
|
|
|
|
|
2009-09-01 06:08:13 +08:00
|
|
|
void __init leon_init_smp(void)
|
|
|
|
|
{
|
|
|
|
|
/* Patch ipi15 trap table */
|
|
|
|
|
t_nmi[1] = t_nmi[1] + (linux_trap_ipi15_leon - linux_trap_ipi15_sun4m);
|
|
|
|
|
|
2012-05-14 21:14:36 +08:00
|
|
|
sparc32_ipi_ops = &leon_ipi_ops;
|
2009-09-01 06:08:13 +08:00
|
|
|
}
|