spapr_ovec_diff(ov, old, new) has somewhat complex semantics. ov is set to those bits which are in new but not old, and it returns as a boolean whether or not there are any bits in old but not new. It turns out that both callers only care about the second, not the first. This is basically equivalent to a bitmap subset operation, which is easier to understand and implement. So replace spapr_ovec_diff() with spapr_ovec_subset(). Cc: Mike Roth <mdroth@linux.vnet.ibm.com> Signed-off-by: David Gibson <david@gibson.dropbear.id.au> Reviewed-by: Cedric Le Goater <clg@fr.ibm.com>
235 lines
5.8 KiB
C
235 lines
5.8 KiB
C
/*
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* QEMU SPAPR Architecture Option Vector Helper Functions
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*
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* Copyright IBM Corp. 2016
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*
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* Authors:
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* Bharata B Rao <bharata@linux.vnet.ibm.com>
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* Michael Roth <mdroth@linux.vnet.ibm.com>
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*
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* This work is licensed under the terms of the GNU GPL, version 2 or later.
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* See the COPYING file in the top-level directory.
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*/
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#include "qemu/osdep.h"
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#include "hw/ppc/spapr_ovec.h"
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#include "migration/vmstate.h"
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#include "qemu/bitmap.h"
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#include "exec/address-spaces.h"
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#include "qemu/error-report.h"
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#include "trace.h"
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#include <libfdt.h>
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#define OV_MAXBYTES 256 /* not including length byte */
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#define OV_MAXBITS (OV_MAXBYTES * BITS_PER_BYTE)
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/* we *could* work with bitmaps directly, but handling the bitmap privately
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* allows us to more safely make assumptions about the bitmap size and
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* simplify the calling code somewhat
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*/
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struct SpaprOptionVector {
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unsigned long *bitmap;
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int32_t bitmap_size; /* only used for migration */
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};
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const VMStateDescription vmstate_spapr_ovec = {
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.name = "spapr_option_vector",
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.version_id = 1,
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.minimum_version_id = 1,
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.fields = (VMStateField[]) {
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VMSTATE_BITMAP(bitmap, SpaprOptionVector, 1, bitmap_size),
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VMSTATE_END_OF_LIST()
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}
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};
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SpaprOptionVector *spapr_ovec_new(void)
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{
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SpaprOptionVector *ov;
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ov = g_new0(SpaprOptionVector, 1);
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ov->bitmap = bitmap_new(OV_MAXBITS);
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ov->bitmap_size = OV_MAXBITS;
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return ov;
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}
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SpaprOptionVector *spapr_ovec_clone(SpaprOptionVector *ov_orig)
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{
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SpaprOptionVector *ov;
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g_assert(ov_orig);
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ov = spapr_ovec_new();
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bitmap_copy(ov->bitmap, ov_orig->bitmap, OV_MAXBITS);
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return ov;
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}
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void spapr_ovec_intersect(SpaprOptionVector *ov,
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SpaprOptionVector *ov1,
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SpaprOptionVector *ov2)
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{
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g_assert(ov);
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g_assert(ov1);
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g_assert(ov2);
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bitmap_and(ov->bitmap, ov1->bitmap, ov2->bitmap, OV_MAXBITS);
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}
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/* returns true if ov1 has a subset of bits in ov2 */
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bool spapr_ovec_subset(SpaprOptionVector *ov1, SpaprOptionVector *ov2)
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{
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unsigned long *tmp = bitmap_new(OV_MAXBITS);
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bool result;
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g_assert(ov1);
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g_assert(ov2);
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bitmap_andnot(tmp, ov1->bitmap, ov2->bitmap, OV_MAXBITS);
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result = bitmap_empty(tmp, OV_MAXBITS);
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g_free(tmp);
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return result;
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}
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void spapr_ovec_cleanup(SpaprOptionVector *ov)
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{
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if (ov) {
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g_free(ov->bitmap);
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g_free(ov);
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}
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}
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void spapr_ovec_set(SpaprOptionVector *ov, long bitnr)
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{
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g_assert(ov);
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g_assert(bitnr < OV_MAXBITS);
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set_bit(bitnr, ov->bitmap);
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}
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void spapr_ovec_clear(SpaprOptionVector *ov, long bitnr)
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{
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g_assert(ov);
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g_assert(bitnr < OV_MAXBITS);
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clear_bit(bitnr, ov->bitmap);
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}
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bool spapr_ovec_test(SpaprOptionVector *ov, long bitnr)
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{
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g_assert(ov);
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g_assert(bitnr < OV_MAXBITS);
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return test_bit(bitnr, ov->bitmap) ? true : false;
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}
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static void guest_byte_to_bitmap(uint8_t entry, unsigned long *bitmap,
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long bitmap_offset)
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{
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int i;
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for (i = 0; i < BITS_PER_BYTE; i++) {
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if (entry & (1 << (BITS_PER_BYTE - 1 - i))) {
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bitmap_set(bitmap, bitmap_offset + i, 1);
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}
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}
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}
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static uint8_t guest_byte_from_bitmap(unsigned long *bitmap, long bitmap_offset)
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{
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uint8_t entry = 0;
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int i;
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for (i = 0; i < BITS_PER_BYTE; i++) {
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if (test_bit(bitmap_offset + i, bitmap)) {
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entry |= (1 << (BITS_PER_BYTE - 1 - i));
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}
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}
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return entry;
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}
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static target_ulong vector_addr(target_ulong table_addr, int vector)
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{
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uint16_t vector_count, vector_len;
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int i;
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vector_count = ldub_phys(&address_space_memory, table_addr) + 1;
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if (vector > vector_count) {
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return 0;
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}
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table_addr++; /* skip nr option vectors */
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for (i = 0; i < vector - 1; i++) {
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vector_len = ldub_phys(&address_space_memory, table_addr) + 1;
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table_addr += vector_len + 1; /* bit-vector + length byte */
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}
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return table_addr;
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}
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SpaprOptionVector *spapr_ovec_parse_vector(target_ulong table_addr, int vector)
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{
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SpaprOptionVector *ov;
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target_ulong addr;
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uint16_t vector_len;
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int i;
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g_assert(table_addr);
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g_assert(vector >= 1); /* vector numbering starts at 1 */
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addr = vector_addr(table_addr, vector);
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if (!addr) {
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/* specified vector isn't present */
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return NULL;
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}
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vector_len = ldub_phys(&address_space_memory, addr++) + 1;
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g_assert(vector_len <= OV_MAXBYTES);
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ov = spapr_ovec_new();
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for (i = 0; i < vector_len; i++) {
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uint8_t entry = ldub_phys(&address_space_memory, addr + i);
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if (entry) {
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trace_spapr_ovec_parse_vector(vector, i + 1, vector_len, entry);
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guest_byte_to_bitmap(entry, ov->bitmap, i * BITS_PER_BYTE);
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}
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}
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return ov;
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}
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int spapr_ovec_populate_dt(void *fdt, int fdt_offset,
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SpaprOptionVector *ov, const char *name)
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{
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uint8_t vec[OV_MAXBYTES + 1];
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uint16_t vec_len;
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unsigned long lastbit;
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int i;
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g_assert(ov);
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lastbit = find_last_bit(ov->bitmap, OV_MAXBITS);
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/* if no bits are set, include at least 1 byte of the vector so we can
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* still encoded this in the device tree while abiding by the same
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* encoding/sizing expected in ibm,client-architecture-support
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*/
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vec_len = (lastbit == OV_MAXBITS) ? 1 : lastbit / BITS_PER_BYTE + 1;
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g_assert(vec_len <= OV_MAXBYTES);
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/* guest expects vector len encoded as vec_len - 1, since the length byte
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* is assumed and not included, and the first byte of the vector
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* is assumed as well
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*/
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vec[0] = vec_len - 1;
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for (i = 1; i < vec_len + 1; i++) {
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vec[i] = guest_byte_from_bitmap(ov->bitmap, (i - 1) * BITS_PER_BYTE);
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if (vec[i]) {
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trace_spapr_ovec_populate_dt(i, vec_len, vec[i]);
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}
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}
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return fdt_setprop(fdt, fdt_offset, name, vec, vec_len + 1);
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}
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