bybrooklyn/linux
1
0
Fork 0
mirror of https://github.com/torvalds/linux.git synced 2026-04-18 06:44:00 -04:00
Code Issues Packages Projects Releases Wiki Activity

parisc: Avoid calling SMP cache flush functions on cache-less machines

Browse Source 
At least the qemu virtual machine does not provide D- and I-caches,
so skip triggering SMP irqs to flush caches on such machines.

Further optimize the caching code by using static branches and making
some functions static.

Signed-off-by: Helge Deller <deller@gmx.de>
This commit is contained in:
Helge Deller
2022-03-12 21:03:33 +01:00
parent a58e9d0984
commit 0a57549769
3 changed files with 44 additions and 38 deletions
Download Patch File Download Diff File Expand all files Collapse all files

57
arch/parisc/kernel/cache.c
View File

@@ -38,6 +38,9 @@ EXPORT_SYMBOL(flush_dcache_page_asm);
void purge_dcache_page_asm(unsigned long phys_addr, unsigned long vaddr);
void flush_icache_page_asm(unsigned long phys_addr, unsigned long vaddr);
/* Internal implementation in arch/parisc/kernel/pacache.S */
void flush_data_cache_local(void *); /* flushes local data-cache only */
void flush_instruction_cache_local(void); /* flushes local code-cache only */
/* On some machines (i.e., ones with the Merced bus), there can be
* only a single PxTLB broadcast at a time; this must be guaranteed
@@ -58,26 +61,35 @@ struct pdc_cache_info cache_info __ro_after_init;
static struct pdc_btlb_info btlb_info __ro_after_init;
#endif
#ifdef CONFIG_SMP
void
flush_data_cache(void)
{
on_each_cpu(flush_data_cache_local, NULL, 1);
}
void
flush_instruction_cache(void)
{
on_each_cpu(flush_instruction_cache_local, NULL, 1);
}
#endif
DEFINE_STATIC_KEY_TRUE(parisc_has_cache);
DEFINE_STATIC_KEY_TRUE(parisc_has_dcache);
DEFINE_STATIC_KEY_TRUE(parisc_has_icache);
void
flush_cache_all_local(void)
static void cache_flush_local_cpu(void *dummy)
{
flush_instruction_cache_local(NULL);
flush_data_cache_local(NULL);
if (static_branch_likely(&parisc_has_icache))
flush_instruction_cache_local();
if (static_branch_likely(&parisc_has_dcache))
flush_data_cache_local(NULL);
}
EXPORT_SYMBOL(flush_cache_all_local);
void flush_cache_all_local(void)
{
cache_flush_local_cpu(NULL);
}
void flush_cache_all(void)
{
if (static_branch_likely(&parisc_has_cache))
on_each_cpu(cache_flush_local_cpu, NULL, 1);
}
static inline void flush_data_cache(void)
{
if (static_branch_likely(&parisc_has_dcache))
on_each_cpu(flush_data_cache_local, NULL, 1);
}
/* Virtual address of pfn. */
#define pfn_va(pfn) __va(PFN_PHYS(pfn))
@@ -375,7 +387,6 @@ EXPORT_SYMBOL(flush_dcache_page);
/* Defined in arch/parisc/kernel/pacache.S */
EXPORT_SYMBOL(flush_kernel_dcache_range_asm);
EXPORT_SYMBOL(flush_data_cache_local);
EXPORT_SYMBOL(flush_kernel_icache_range_asm);
#define FLUSH_THRESHOLD 0x80000 /* 0.5MB */
@@ -517,16 +528,6 @@ int __flush_tlb_range(unsigned long sid, unsigned long start,
return 0;
}
static void cacheflush_h_tmp_function(void *dummy)
{
flush_cache_all_local();
}
void flush_cache_all(void)
{
on_each_cpu(cacheflush_h_tmp_function, NULL, 1);
}
static inline unsigned long mm_total_size(struct mm_struct *mm)
{
struct vm_area_struct *vma;