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smp: aarch64: Don't needlessly invalidate the data cache 

Also get rid of the function to do clean + invalidate as not to be
tempted by it.
This commit is contained in:
Kacper Słomiński 2023-08-18 00:55:22 +02:00 committed by mintsuki
parent ba5d63b82a
commit 50dab6c2f1
3 changed files with 2 additions and 16 deletions
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1
common/sys/cpu.c
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@ -23,7 +23,6 @@ extern void delay(uint64_t cycles);
extern size_t icache_line_size(void);
extern size_t dcache_line_size(void);
extern void clean_inval_dcache_poc(uintptr_t start, uintptr_t end);
extern void clean_dcache_poc(uintptr_t start, uintptr_t end);
extern void inval_icache_pou(uintptr_t start, uintptr_t end);
extern int current_el(void);

13
common/sys/cpu.h
View File

@ -252,19 +252,6 @@ inline size_t dcache_line_size(void) {
return ((ctr >> 16) & 0b1111) << 4;
}
// Clean and invalidate D-Cache to Point of Coherency
inline void clean_inval_dcache_poc(uintptr_t start, uintptr_t end) {
size_t dsz = dcache_line_size();
uintptr_t addr = start & ~(dsz - 1);
while (addr < end) {
asm volatile ("dc civac, %0" :: "r"(addr) : "memory");
addr += dsz;
}
asm volatile ("dsb sy\n\tisb");
}
// Clean D-Cache to Point of Coherency
inline void clean_dcache_poc(uintptr_t start, uintptr_t end) {
size_t dsz = dcache_line_size();

4
common/sys/smp.c
View File

@ -366,7 +366,7 @@ static bool try_start_ap(int boot_method, uint64_t method_ptr,
// Additionally, the newly-booted AP may have caches disabled which implies
// it possibly does not see our cache contents either.
clean_inval_dcache_poc((uintptr_t)trampoline, (uintptr_t)trampoline + 0x1000);
clean_dcache_poc((uintptr_t)trampoline, (uintptr_t)trampoline + 0x1000);
inval_icache_pou((uintptr_t)trampoline, (uintptr_t)trampoline + 0x1000);
asm volatile ("" ::: "memory");
@ -374,7 +374,7 @@ static bool try_start_ap(int boot_method, uint64_t method_ptr,
switch (boot_method) {
case BOOT_WITH_SPIN_TBL:
*(volatile uint64_t *)method_ptr = (uint64_t)(uintptr_t)trampoline;
clean_inval_dcache_poc(method_ptr, method_ptr + 8);
clean_dcache_poc(method_ptr, method_ptr + 8);
asm ("sev");
break;