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// SPDX-License-Identifier: GPL-2.0
#include <asm/byteorder.h>
#include <asm/lppaca.h>
/*
* The associativity domain numbers are returned from the hypervisor as a
* stream of mixed 16-bit and 32-bit fields. The stream is terminated by the
* special value of "all ones" (aka. 0xffff) and its size may not exceed 48
* bytes.
*
* --- 16-bit fields -->
* _________________________
* | 0 | 1 | 2 | 3 | be_packed[0]
* ------+-----+-----+------
* _________________________
* | 4 | 5 | 6 | 7 | be_packed[1]
* -------------------------
* ...
* _________________________
* | 20 | 21 | 22 | 23 | be_packed[5]
* -------------------------
*
* Convert 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;
u16 last = 0;
bool is_32bit = false;
#define VPHN_FIELD_UNUSED (0xffff)
#define VPHN_FIELD_MSB (0x8000)
#define VPHN_FIELD_MASK (~VPHN_FIELD_MSB)
/* Let's fix the values returned by plpar_hcall9() */
for (i = 0; i < VPHN_REGISTER_COUNT; i++)
be_packed[i] = cpu_to_be64(packed[i]);
for (i = 1; i < VPHN_ASSOC_BUFSIZE; i++) {
u16 new = be16_to_cpup(field++);
if (is_32bit) {
/*
* Let's concatenate the 16 bits of this field to the
* 15 lower bits of the previous field
*/
unpacked[++nr_assoc_doms] =
cpu_to_be32(last << 16 | new);
is_32bit = false;
} else if (new == VPHN_FIELD_UNUSED)
/* This is the list terminator */
break;
else if (new & VPHN_FIELD_MSB) {
/* Data is in the lower 15 bits of this field */
unpacked[++nr_assoc_doms] =
cpu_to_be32(new & VPHN_FIELD_MASK);
} else {
/*
* Data is in the lower 15 bits of this field
* concatenated with the next 16 bit field
*/
last = new;
is_32bit = true;
}
}
/* The first cell contains the length of the property */
unpacked[0] = cpu_to_be32(nr_assoc_doms);
return nr_assoc_doms;
}
/* NOTE: This file is included by a selftest and built in userspace. */
#ifdef __KERNEL__
#include <asm/hvcall.h>
long hcall_vphn(unsigned long cpu, u64 flags, __be32 *associativity)
{
long rc;
long retbuf[PLPAR_HCALL9_BUFSIZE] = {0};
rc = plpar_hcall9(H_HOME_NODE_ASSOCIATIVITY, retbuf, flags, cpu);
vphn_unpack_associativity(retbuf, associativity);
return rc;
}
#endif
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