In my "build everything" tree, changing migration/vmstate.h triggers a recompile of some 2700 out of 6600 objects (not counting tests and objects that don't depend on qemu/osdep.h). hw/hw.h supposedly includes it for convenience. Several other headers include it just to get VMStateDescription. The previous commit made that unnecessary. Include migration/vmstate.h only where it's still needed. Touching it now recompiles only some 1600 objects. Signed-off-by: Markus Armbruster <armbru@redhat.com> Reviewed-by: Alistair Francis <alistair.francis@wdc.com> Message-Id: <20190812052359.30071-16-armbru@redhat.com> Tested-by: Philippe Mathieu-Daudé <philmd@redhat.com>
245 lines
6.3 KiB
C
245 lines
6.3 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 options bits were removed, false otherwise */
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bool spapr_ovec_diff(SpaprOptionVector *ov,
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SpaprOptionVector *ov_old,
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SpaprOptionVector *ov_new)
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{
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unsigned long *change_mask = bitmap_new(OV_MAXBITS);
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unsigned long *removed_bits = bitmap_new(OV_MAXBITS);
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bool bits_were_removed = false;
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g_assert(ov);
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g_assert(ov_old);
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g_assert(ov_new);
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bitmap_xor(change_mask, ov_old->bitmap, ov_new->bitmap, OV_MAXBITS);
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bitmap_and(ov->bitmap, ov_new->bitmap, change_mask, OV_MAXBITS);
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bitmap_and(removed_bits, ov_old->bitmap, change_mask, OV_MAXBITS);
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if (!bitmap_empty(removed_bits, OV_MAXBITS)) {
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bits_were_removed = true;
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}
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g_free(change_mask);
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g_free(removed_bits);
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return bits_were_removed;
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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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