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90 lines
2.4 KiB
90 lines
2.4 KiB
// SPDX-License-Identifier: GPL-2.0 |
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#include <asm/byteorder.h> |
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#include <asm/lppaca.h> |
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/* |
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* The associativity domain numbers are returned from the hypervisor as a |
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* stream of mixed 16-bit and 32-bit fields. The stream is terminated by the |
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* special value of "all ones" (aka. 0xffff) and its size may not exceed 48 |
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* bytes. |
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* |
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* --- 16-bit fields --> |
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* _________________________ |
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* | 0 | 1 | 2 | 3 | be_packed[0] |
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* ------+-----+-----+------ |
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* _________________________ |
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* | 4 | 5 | 6 | 7 | be_packed[1] |
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* ------------------------- |
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* ... |
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* _________________________ |
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* | 20 | 21 | 22 | 23 | be_packed[5] |
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* ------------------------- |
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* |
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* Convert to the sequence they would appear in the ibm,associativity property. |
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*/ |
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static int vphn_unpack_associativity(const long *packed, __be32 *unpacked) |
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{ |
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__be64 be_packed[VPHN_REGISTER_COUNT]; |
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int i, nr_assoc_doms = 0; |
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const __be16 *field = (const __be16 *) be_packed; |
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u16 last = 0; |
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bool is_32bit = false; |
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#define VPHN_FIELD_UNUSED (0xffff) |
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#define VPHN_FIELD_MSB (0x8000) |
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#define VPHN_FIELD_MASK (~VPHN_FIELD_MSB) |
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/* Let's fix the values returned by plpar_hcall9() */ |
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for (i = 0; i < VPHN_REGISTER_COUNT; i++) |
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be_packed[i] = cpu_to_be64(packed[i]); |
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for (i = 1; i < VPHN_ASSOC_BUFSIZE; i++) { |
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u16 new = be16_to_cpup(field++); |
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if (is_32bit) { |
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/* |
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* Let's concatenate the 16 bits of this field to the |
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* 15 lower bits of the previous field |
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*/ |
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unpacked[++nr_assoc_doms] = |
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cpu_to_be32(last << 16 | new); |
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is_32bit = false; |
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} else if (new == VPHN_FIELD_UNUSED) |
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/* This is the list terminator */ |
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break; |
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else if (new & VPHN_FIELD_MSB) { |
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/* Data is in the lower 15 bits of this field */ |
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unpacked[++nr_assoc_doms] = |
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cpu_to_be32(new & VPHN_FIELD_MASK); |
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} else { |
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/* |
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* Data is in the lower 15 bits of this field |
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* concatenated with the next 16 bit field |
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*/ |
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last = new; |
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is_32bit = true; |
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} |
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} |
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/* The first cell contains the length of the property */ |
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unpacked[0] = cpu_to_be32(nr_assoc_doms); |
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return nr_assoc_doms; |
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} |
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/* NOTE: This file is included by a selftest and built in userspace. */ |
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#ifdef __KERNEL__ |
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#include <asm/hvcall.h> |
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long hcall_vphn(unsigned long cpu, u64 flags, __be32 *associativity) |
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{ |
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long rc; |
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long retbuf[PLPAR_HCALL9_BUFSIZE] = {0}; |
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rc = plpar_hcall9(H_HOME_NODE_ASSOCIATIVITY, retbuf, flags, cpu); |
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if (rc == H_SUCCESS) |
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vphn_unpack_associativity(retbuf, associativity); |
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return rc; |
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} |
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#endif
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