In the same spirit as commit
63f501e07a85 ("powerpc/8xx: Simplify TLB
handling"), simplify flush_tlb_kernel_range() for 8xx.
8xx cannot be SMP, and has 'tlbie' and 'tlbia' instructions, so
an inline version of flush_tlb_kernel_range() for 8xx is worth it.
With this page, first leg of change_page_attr() is:
2c: 55 29 00 3c rlwinm r9,r9,0,0,30
30: 91 23 00 00 stw r9,0(r3)
34: 7c 00 22 64 tlbie r4,r0
38: 7c 00 04 ac hwsync
3c: 38 60 00 00 li r3,0
40: 4e 80 00 20 blr
Before the patch it was:
30: 55 29 00 3c rlwinm r9,r9,0,0,30
34: 91 2a 00 00 stw r9,0(r10)
38: 94 21 ff f0 stwu r1,-16(r1)
3c: 7c 08 02 a6 mflr r0
40: 38 83 10 00 addi r4,r3,4096
44: 90 01 00 14 stw r0,20(r1)
48: 48 00 00 01 bl 48 <change_page_attr+0x48>
48: R_PPC_REL24 flush_tlb_kernel_range
4c: 80 01 00 14 lwz r0,20(r1)
50: 38 60 00 00 li r3,0
54: 7c 08 03 a6 mtlr r0
58: 38 21 00 10 addi r1,r1,16
5c: 4e 80 00 20 blr
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/d2610043419ce3e0e53a85386baf2c3625af5cfb.1647877442.git.christophe.leroy@csgroup.eu
extern void flush_tlb_range(struct vm_area_struct *vma, unsigned long start,
unsigned long end);
-extern void flush_tlb_kernel_range(unsigned long start, unsigned long end);
#ifdef CONFIG_PPC_8xx
static inline void local_flush_tlb_mm(struct mm_struct *mm)
{
asm volatile ("tlbie %0; sync" : : "r" (vmaddr) : "memory");
}
+
+static inline void flush_tlb_kernel_range(unsigned long start, unsigned long end)
+{
+ start &= PAGE_MASK;
+
+ if (end - start <= PAGE_SIZE)
+ asm volatile ("tlbie %0; sync" : : "r" (start) : "memory");
+ else
+ asm volatile ("sync; tlbia; isync" : : : "memory");
+}
#else
+extern void flush_tlb_kernel_range(unsigned long start, unsigned long end);
extern void local_flush_tlb_mm(struct mm_struct *mm);
extern void local_flush_tlb_page(struct vm_area_struct *vma, unsigned long vmaddr);
/*
* Flush kernel TLB entries in the given range
*/
+#ifndef CONFIG_PPC_8xx
void flush_tlb_kernel_range(unsigned long start, unsigned long end)
{
#ifdef CONFIG_SMP
#endif
}
EXPORT_SYMBOL(flush_tlb_kernel_range);
+#endif
/*
* Currently, for range flushing, we just do a full mm flush. This should