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powerpc/32s: move CTX_TO_VSID() into mmu-hash.h 

In order to reuse it in switch_mmu_context(), this
patch moves CTX_TO_VSID() macro into asm/book3s/32/mmu-hash.h

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/26b36ef2939234a04b37baf6ffe50cba81f5d1b7.1622708530.git.christophe.leroy@csgroup.eu
This commit is contained in:
Christophe Leroy 2021-06-03 08:41:38 +00:00 committed by Michael Ellerman
parent 91bb30822a
commit 7235bb3593
3 changed files with 10 additions and 16 deletions
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10
arch/powerpc/include/asm/book3s/32/mmu-hash.h
View File

@ -66,6 +66,16 @@ struct ppc_bat {
#ifndef __ASSEMBLY__
/*
* This macro defines the mapping from contexts to VSIDs (virtual
* segment IDs). We use a skew on both the context and the high 4 bits
* of the 32-bit virtual address (the "effective segment ID") in order
* to spread out the entries in the MMU hash table. Note, if this
* function is changed then hash functions will have to be
* changed to correspond.
*/
#define CTX_TO_VSID(c, id) ((((c) * (897 * 16)) + (id * 0x111)) & 0xffffff)
/*
* Hardware Page Table Entry
* Note that the xpn and x bitfields are used only by processors that

3
arch/powerpc/kvm/book3s_32_mmu_host.c
View File

@ -353,9 +353,6 @@ void kvmppc_mmu_destroy_pr(struct kvm_vcpu *vcpu)
preempt_enable();
}
/* From mm/mmu_context_hash32.c */
#define CTX_TO_VSID(c, id) ((((c) * (897 * 16)) + (id * 0x111)) & 0xffffff)
int kvmppc_mmu_init_pr(struct kvm_vcpu *vcpu)
{
struct kvmppc_vcpu_book3s *vcpu3s = to_book3s(vcpu);

13
arch/powerpc/mm/book3s32/mmu_context.c
View File

@ -39,19 +39,6 @@
#define LAST_CONTEXT 32767
#define FIRST_CONTEXT 1
/*
* This function defines the mapping from contexts to VSIDs (virtual
* segment IDs). We use a skew on both the context and the high 4 bits
* of the 32-bit virtual address (the "effective segment ID") in order
* to spread out the entries in the MMU hash table. Note, if this
* function is changed then arch/ppc/mm/hashtable.S will have to be
* changed to correspond.
*
*
* CTX_TO_VSID(ctx, va) (((ctx) * (897 * 16) + ((va) >> 28) * 0x111) \
* & 0xffffff)
*/
static unsigned long next_mmu_context;
static unsigned long context_map[LAST_CONTEXT / BITS_PER_LONG + 1];