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powerpc/vphn: move VPHN parsing logic to a separate file

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The goal behind this patch is to be able to write userland tests for the
VPHN parsing code.

Suggested-by: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Greg Kurz <gkurz@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Greg Kurz 2015-02-23 16:14:31 +01:00 committed by Michael Ellerman
parent b1fc9484aa
commit 4b6cfb2a8c
4 changed files with 70 additions and 58 deletions
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1
arch/powerpc/mm/Makefile
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@ -24,6 +24,7 @@ obj-$(CONFIG_40x) += 40x_mmu.o
obj-$(CONFIG_44x) += 44x_mmu.o
obj-$(CONFIG_PPC_FSL_BOOK3E) += fsl_booke_mmu.o
obj-$(CONFIG_NEED_MULTIPLE_NODES) += numa.o
obj-$(CONFIG_PPC_SPLPAR) += vphn.o
obj-$(CONFIG_PPC_MM_SLICES) += slice.o
obj-y += hugetlbpage.o
ifeq ($(CONFIG_HUGETLB_PAGE),y)

61
arch/powerpc/mm/numa.c
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@ -1177,6 +1177,9 @@ u64 memory_hotplug_max(void)
/* Virtual Processor Home Node (VPHN) support */
#ifdef CONFIG_PPC_SPLPAR
#include "vphn.h"
struct topology_update_data {
struct topology_update_data *next;
unsigned int cpu;
@ -1247,64 +1250,6 @@ static int update_cpu_associativity_changes_mask(void)
return cpumask_weight(changes);
}
/* The H_HOME_NODE_ASSOCIATIVITY h_call returns 6 64-bit registers.
*/
#define VPHN_REGISTER_COUNT 6
/*
* 6 64-bit registers unpacked into 12 32-bit associativity values. To form
* the complete property we have to add the length in the first cell.
*/
#define VPHN_ASSOC_BUFSIZE (VPHN_REGISTER_COUNT*sizeof(u64)/sizeof(u32) + 1)
/*
* Convert the associativity domain numbers returned from the hypervisor
* to the sequence they would appear in the ibm,associativity property.
*/
static int vphn_unpack_associativity(const long *packed, __be32 *unpacked)
{
__be64 be_packed[VPHN_REGISTER_COUNT];
int i, nr_assoc_doms = 0;
const __be16 *field = (const __be16 *) be_packed;
#define VPHN_FIELD_UNUSED (0xffff)
#define VPHN_FIELD_MSB (0x8000)
#define VPHN_FIELD_MASK (~VPHN_FIELD_MSB)
/* Let's recreate the original stream. */
for (i = 0; i < VPHN_REGISTER_COUNT; i++)
be_packed[i] = cpu_to_be64(packed[i]);
for (i = 1; i < VPHN_ASSOC_BUFSIZE; i++) {
if (be16_to_cpup(field) == VPHN_FIELD_UNUSED) {
/* All significant fields processed, and remaining
* fields contain the reserved value of all 1's.
* Just store them.
*/
unpacked[i] = *((__be32 *)field);
field += 2;
} else if (be16_to_cpup(field) & VPHN_FIELD_MSB) {
/* Data is in the lower 15 bits of this field */
unpacked[i] = cpu_to_be32(
be16_to_cpup(field) & VPHN_FIELD_MASK);
field++;
nr_assoc_doms++;
} else {
/* Data is in the lower 15 bits of this field
* concatenated with the next 16 bit field
*/
unpacked[i] = *((__be32 *)field);
field += 2;
nr_assoc_doms++;
}
}
/* The first cell contains the length of the property */
unpacked[0] = cpu_to_be32(nr_assoc_doms);
return nr_assoc_doms;
}
/*
* Retrieve the new associativity information for a virtual processor's
* home node.

50
arch/powerpc/mm/vphn.c Normal file
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@ -0,0 +1,50 @@
#include <asm/byteorder.h>
#include "vphn.h"
/*
* Convert the associativity domain numbers returned from the hypervisor
* to the sequence they would appear in the ibm,associativity property.
*/
int vphn_unpack_associativity(const long *packed, __be32 *unpacked)
{
__be64 be_packed[VPHN_REGISTER_COUNT];
int i, nr_assoc_doms = 0;
const __be16 *field = (const __be16 *) be_packed;
#define VPHN_FIELD_UNUSED (0xffff)
#define VPHN_FIELD_MSB (0x8000)
#define VPHN_FIELD_MASK (~VPHN_FIELD_MSB)
/* Let's recreate the original stream. */
for (i = 0; i < VPHN_REGISTER_COUNT; i++)
be_packed[i] = cpu_to_be64(packed[i]);
for (i = 1; i < VPHN_ASSOC_BUFSIZE; i++) {
if (be16_to_cpup(field) == VPHN_FIELD_UNUSED) {
/* All significant fields processed, and remaining
* fields contain the reserved value of all 1's.
* Just store them.
*/
unpacked[i] = *((__be32 *)field);
field += 2;
} else if (be16_to_cpup(field) & VPHN_FIELD_MSB) {
/* Data is in the lower 15 bits of this field */
unpacked[i] = cpu_to_be32(
be16_to_cpup(field) & VPHN_FIELD_MASK);
field++;
nr_assoc_doms++;
} else {
/* Data is in the lower 15 bits of this field
* concatenated with the next 16 bit field
*/
unpacked[i] = *((__be32 *)field);
field += 2;
nr_assoc_doms++;
}
}
/* The first cell contains the length of the property */
unpacked[0] = cpu_to_be32(nr_assoc_doms);
return nr_assoc_doms;
}

16
arch/powerpc/mm/vphn.h Normal file
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@ -0,0 +1,16 @@
#ifndef _ARCH_POWERPC_MM_VPHN_H_
#define _ARCH_POWERPC_MM_VPHN_H_
/* The H_HOME_NODE_ASSOCIATIVITY h_call returns 6 64-bit registers.
*/
#define VPHN_REGISTER_COUNT 6
/*
* 6 64-bit registers unpacked into 12 32-bit associativity values. To form
* the complete property we have to add the length in the first cell.
*/
#define VPHN_ASSOC_BUFSIZE (VPHN_REGISTER_COUNT*sizeof(u64)/sizeof(u32) + 1)
extern int vphn_unpack_associativity(const long *packed, __be32 *unpacked);
#endif