mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-27 14:43:58 +08:00
ca15ca406f
Patch series "mm: cleanup usage of <asm/pgalloc.h>"
Most architectures have very similar versions of pXd_alloc_one() and
pXd_free_one() for intermediate levels of page table. These patches add
generic versions of these functions in <asm-generic/pgalloc.h> and enable
use of the generic functions where appropriate.
In addition, functions declared and defined in <asm/pgalloc.h> headers are
used mostly by core mm and early mm initialization in arch and there is no
actual reason to have the <asm/pgalloc.h> included all over the place.
The first patch in this series removes unneeded includes of
<asm/pgalloc.h>
In the end it didn't work out as neatly as I hoped and moving
pXd_alloc_track() definitions to <asm-generic/pgalloc.h> would require
unnecessary changes to arches that have custom page table allocations, so
I've decided to move lib/ioremap.c to mm/ and make pgalloc-track.h local
to mm/.
This patch (of 8):
In most cases <asm/pgalloc.h> header is required only for allocations of
page table memory. Most of the .c files that include that header do not
use symbols declared in <asm/pgalloc.h> and do not require that header.
As for the other header files that used to include <asm/pgalloc.h>, it is
possible to move that include into the .c file that actually uses symbols
from <asm/pgalloc.h> and drop the include from the header file.
The process was somewhat automated using
sed -i -E '/[<"]asm\/pgalloc\.h/d' \
$(grep -L -w -f /tmp/xx \
$(git grep -E -l '[<"]asm/pgalloc\.h'))
where /tmp/xx contains all the symbols defined in
arch/*/include/asm/pgalloc.h.
[rppt@linux.ibm.com: fix powerpc warning]
Signed-off-by: Mike Rapoport <rppt@linux.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Reviewed-by: Pekka Enberg <penberg@kernel.org>
Acked-by: Geert Uytterhoeven <geert@linux-m68k.org> [m68k]
Cc: Abdul Haleem <abdhalee@linux.vnet.ibm.com>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Christophe Leroy <christophe.leroy@csgroup.eu>
Cc: Joerg Roedel <joro@8bytes.org>
Cc: Max Filippov <jcmvbkbc@gmail.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Satheesh Rajendran <sathnaga@linux.vnet.ibm.com>
Cc: Stafford Horne <shorne@gmail.com>
Cc: Stephen Rothwell <sfr@canb.auug.org.au>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Joerg Roedel <jroedel@suse.de>
Cc: Matthew Wilcox <willy@infradead.org>
Link: http://lkml.kernel.org/r/20200627143453.31835-1-rppt@kernel.org
Link: http://lkml.kernel.org/r/20200627143453.31835-2-rppt@kernel.org
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
106 lines
2.8 KiB
C
106 lines
2.8 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
#include <linux/init.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/mm_types.h>
|
|
#include <linux/pgtable.h>
|
|
|
|
#include <asm/bugs.h>
|
|
#include <asm/cacheflush.h>
|
|
#include <asm/idmap.h>
|
|
#include <asm/memory.h>
|
|
#include <asm/smp_plat.h>
|
|
#include <asm/suspend.h>
|
|
#include <asm/tlbflush.h>
|
|
|
|
extern int __cpu_suspend(unsigned long, int (*)(unsigned long), u32 cpuid);
|
|
extern void cpu_resume_mmu(void);
|
|
|
|
#ifdef CONFIG_MMU
|
|
int cpu_suspend(unsigned long arg, int (*fn)(unsigned long))
|
|
{
|
|
struct mm_struct *mm = current->active_mm;
|
|
u32 __mpidr = cpu_logical_map(smp_processor_id());
|
|
int ret;
|
|
|
|
if (!idmap_pgd)
|
|
return -EINVAL;
|
|
|
|
/*
|
|
* Provide a temporary page table with an identity mapping for
|
|
* the MMU-enable code, required for resuming. On successful
|
|
* resume (indicated by a zero return code), we need to switch
|
|
* back to the correct page tables.
|
|
*/
|
|
ret = __cpu_suspend(arg, fn, __mpidr);
|
|
if (ret == 0) {
|
|
cpu_switch_mm(mm->pgd, mm);
|
|
local_flush_bp_all();
|
|
local_flush_tlb_all();
|
|
check_other_bugs();
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
#else
|
|
int cpu_suspend(unsigned long arg, int (*fn)(unsigned long))
|
|
{
|
|
u32 __mpidr = cpu_logical_map(smp_processor_id());
|
|
return __cpu_suspend(arg, fn, __mpidr);
|
|
}
|
|
#define idmap_pgd NULL
|
|
#endif
|
|
|
|
/*
|
|
* This is called by __cpu_suspend() to save the state, and do whatever
|
|
* flushing is required to ensure that when the CPU goes to sleep we have
|
|
* the necessary data available when the caches are not searched.
|
|
*/
|
|
void __cpu_suspend_save(u32 *ptr, u32 ptrsz, u32 sp, u32 *save_ptr)
|
|
{
|
|
u32 *ctx = ptr;
|
|
|
|
*save_ptr = virt_to_phys(ptr);
|
|
|
|
/* This must correspond to the LDM in cpu_resume() assembly */
|
|
*ptr++ = virt_to_phys(idmap_pgd);
|
|
*ptr++ = sp;
|
|
*ptr++ = virt_to_phys(cpu_do_resume);
|
|
|
|
cpu_do_suspend(ptr);
|
|
|
|
flush_cache_louis();
|
|
|
|
/*
|
|
* flush_cache_louis does not guarantee that
|
|
* save_ptr and ptr are cleaned to main memory,
|
|
* just up to the Level of Unification Inner Shareable.
|
|
* Since the context pointer and context itself
|
|
* are to be retrieved with the MMU off that
|
|
* data must be cleaned from all cache levels
|
|
* to main memory using "area" cache primitives.
|
|
*/
|
|
__cpuc_flush_dcache_area(ctx, ptrsz);
|
|
__cpuc_flush_dcache_area(save_ptr, sizeof(*save_ptr));
|
|
|
|
outer_clean_range(*save_ptr, *save_ptr + ptrsz);
|
|
outer_clean_range(virt_to_phys(save_ptr),
|
|
virt_to_phys(save_ptr) + sizeof(*save_ptr));
|
|
}
|
|
|
|
extern struct sleep_save_sp sleep_save_sp;
|
|
|
|
static int cpu_suspend_alloc_sp(void)
|
|
{
|
|
void *ctx_ptr;
|
|
/* ctx_ptr is an array of physical addresses */
|
|
ctx_ptr = kcalloc(mpidr_hash_size(), sizeof(u32), GFP_KERNEL);
|
|
|
|
if (WARN_ON(!ctx_ptr))
|
|
return -ENOMEM;
|
|
sleep_save_sp.save_ptr_stash = ctx_ptr;
|
|
sleep_save_sp.save_ptr_stash_phys = virt_to_phys(ctx_ptr);
|
|
sync_cache_w(&sleep_save_sp);
|
|
return 0;
|
|
}
|
|
early_initcall(cpu_suspend_alloc_sp);
|