From 3f2546b2ef55b661fd8dd69682b38992225e86f6 Mon Sep 17 00:00:00 2001 From: fishsoupisgood Date: Mon, 29 Apr 2019 01:17:54 +0100 Subject: Initial import of qemu-2.4.1 --- memory.c | 2277 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 2277 insertions(+) create mode 100644 memory.c (limited to 'memory.c') diff --git a/memory.c b/memory.c new file mode 100644 index 00000000..10c1df53 --- /dev/null +++ b/memory.c @@ -0,0 +1,2277 @@ +/* + * Physical memory management + * + * Copyright 2011 Red Hat, Inc. and/or its affiliates + * + * Authors: + * Avi Kivity + * + * This work is licensed under the terms of the GNU GPL, version 2. See + * the COPYING file in the top-level directory. + * + * Contributions after 2012-01-13 are licensed under the terms of the + * GNU GPL, version 2 or (at your option) any later version. + */ + +#include "exec/memory.h" +#include "exec/address-spaces.h" +#include "exec/ioport.h" +#include "qapi/visitor.h" +#include "qemu/bitops.h" +#include "qom/object.h" +#include "trace.h" +#include + +#include "exec/memory-internal.h" +#include "exec/ram_addr.h" +#include "sysemu/sysemu.h" + +//#define DEBUG_UNASSIGNED + +#define RAM_ADDR_INVALID (~(ram_addr_t)0) + +static unsigned memory_region_transaction_depth; +static bool memory_region_update_pending; +static bool ioeventfd_update_pending; +static bool global_dirty_log = false; + +static QTAILQ_HEAD(memory_listeners, MemoryListener) memory_listeners + = QTAILQ_HEAD_INITIALIZER(memory_listeners); + +static QTAILQ_HEAD(, AddressSpace) address_spaces + = QTAILQ_HEAD_INITIALIZER(address_spaces); + +typedef struct AddrRange AddrRange; + +/* + * Note that signed integers are needed for negative offsetting in aliases + * (large MemoryRegion::alias_offset). + */ +struct AddrRange { + Int128 start; + Int128 size; +}; + +static AddrRange addrrange_make(Int128 start, Int128 size) +{ + return (AddrRange) { start, size }; +} + +static bool addrrange_equal(AddrRange r1, AddrRange r2) +{ + return int128_eq(r1.start, r2.start) && int128_eq(r1.size, r2.size); +} + +static Int128 addrrange_end(AddrRange r) +{ + return int128_add(r.start, r.size); +} + +static AddrRange addrrange_shift(AddrRange range, Int128 delta) +{ + int128_addto(&range.start, delta); + return range; +} + +static bool addrrange_contains(AddrRange range, Int128 addr) +{ + return int128_ge(addr, range.start) + && int128_lt(addr, addrrange_end(range)); +} + +static bool addrrange_intersects(AddrRange r1, AddrRange r2) +{ + return addrrange_contains(r1, r2.start) + || addrrange_contains(r2, r1.start); +} + +static AddrRange addrrange_intersection(AddrRange r1, AddrRange r2) +{ + Int128 start = int128_max(r1.start, r2.start); + Int128 end = int128_min(addrrange_end(r1), addrrange_end(r2)); + return addrrange_make(start, int128_sub(end, start)); +} + +enum ListenerDirection { Forward, Reverse }; + +static bool memory_listener_match(MemoryListener *listener, + MemoryRegionSection *section) +{ + return !listener->address_space_filter + || listener->address_space_filter == section->address_space; +} + +#define MEMORY_LISTENER_CALL_GLOBAL(_callback, _direction, _args...) \ + do { \ + MemoryListener *_listener; \ + \ + switch (_direction) { \ + case Forward: \ + QTAILQ_FOREACH(_listener, &memory_listeners, link) { \ + if (_listener->_callback) { \ + _listener->_callback(_listener, ##_args); \ + } \ + } \ + break; \ + case Reverse: \ + QTAILQ_FOREACH_REVERSE(_listener, &memory_listeners, \ + memory_listeners, link) { \ + if (_listener->_callback) { \ + _listener->_callback(_listener, ##_args); \ + } \ + } \ + break; \ + default: \ + abort(); \ + } \ + } while (0) + +#define MEMORY_LISTENER_CALL(_callback, _direction, _section, _args...) \ + do { \ + MemoryListener *_listener; \ + \ + switch (_direction) { \ + case Forward: \ + QTAILQ_FOREACH(_listener, &memory_listeners, link) { \ + if (_listener->_callback \ + && memory_listener_match(_listener, _section)) { \ + _listener->_callback(_listener, _section, ##_args); \ + } \ + } \ + break; \ + case Reverse: \ + QTAILQ_FOREACH_REVERSE(_listener, &memory_listeners, \ + memory_listeners, link) { \ + if (_listener->_callback \ + && memory_listener_match(_listener, _section)) { \ + _listener->_callback(_listener, _section, ##_args); \ + } \ + } \ + break; \ + default: \ + abort(); \ + } \ + } while (0) + +/* No need to ref/unref .mr, the FlatRange keeps it alive. */ +#define MEMORY_LISTENER_UPDATE_REGION(fr, as, dir, callback, _args...) \ + MEMORY_LISTENER_CALL(callback, dir, (&(MemoryRegionSection) { \ + .mr = (fr)->mr, \ + .address_space = (as), \ + .offset_within_region = (fr)->offset_in_region, \ + .size = (fr)->addr.size, \ + .offset_within_address_space = int128_get64((fr)->addr.start), \ + .readonly = (fr)->readonly, \ + }), ##_args) + +struct CoalescedMemoryRange { + AddrRange addr; + QTAILQ_ENTRY(CoalescedMemoryRange) link; +}; + +struct MemoryRegionIoeventfd { + AddrRange addr; + bool match_data; + uint64_t data; + EventNotifier *e; +}; + +static bool memory_region_ioeventfd_before(MemoryRegionIoeventfd a, + MemoryRegionIoeventfd b) +{ + if (int128_lt(a.addr.start, b.addr.start)) { + return true; + } else if (int128_gt(a.addr.start, b.addr.start)) { + return false; + } else if (int128_lt(a.addr.size, b.addr.size)) { + return true; + } else if (int128_gt(a.addr.size, b.addr.size)) { + return false; + } else if (a.match_data < b.match_data) { + return true; + } else if (a.match_data > b.match_data) { + return false; + } else if (a.match_data) { + if (a.data < b.data) { + return true; + } else if (a.data > b.data) { + return false; + } + } + if (a.e < b.e) { + return true; + } else if (a.e > b.e) { + return false; + } + return false; +} + +static bool memory_region_ioeventfd_equal(MemoryRegionIoeventfd a, + MemoryRegionIoeventfd b) +{ + return !memory_region_ioeventfd_before(a, b) + && !memory_region_ioeventfd_before(b, a); +} + +typedef struct FlatRange FlatRange; +typedef struct FlatView FlatView; + +/* Range of memory in the global map. Addresses are absolute. */ +struct FlatRange { + MemoryRegion *mr; + hwaddr offset_in_region; + AddrRange addr; + uint8_t dirty_log_mask; + bool romd_mode; + bool readonly; +}; + +/* Flattened global view of current active memory hierarchy. Kept in sorted + * order. + */ +struct FlatView { + struct rcu_head rcu; + unsigned ref; + FlatRange *ranges; + unsigned nr; + unsigned nr_allocated; +}; + +typedef struct AddressSpaceOps AddressSpaceOps; + +#define FOR_EACH_FLAT_RANGE(var, view) \ + for (var = (view)->ranges; var < (view)->ranges + (view)->nr; ++var) + +static bool flatrange_equal(FlatRange *a, FlatRange *b) +{ + return a->mr == b->mr + && addrrange_equal(a->addr, b->addr) + && a->offset_in_region == b->offset_in_region + && a->romd_mode == b->romd_mode + && a->readonly == b->readonly; +} + +static void flatview_init(FlatView *view) +{ + view->ref = 1; + view->ranges = NULL; + view->nr = 0; + view->nr_allocated = 0; +} + +/* Insert a range into a given position. Caller is responsible for maintaining + * sorting order. + */ +static void flatview_insert(FlatView *view, unsigned pos, FlatRange *range) +{ + if (view->nr == view->nr_allocated) { + view->nr_allocated = MAX(2 * view->nr, 10); + view->ranges = g_realloc(view->ranges, + view->nr_allocated * sizeof(*view->ranges)); + } + memmove(view->ranges + pos + 1, view->ranges + pos, + (view->nr - pos) * sizeof(FlatRange)); + view->ranges[pos] = *range; + memory_region_ref(range->mr); + ++view->nr; +} + +static void flatview_destroy(FlatView *view) +{ + int i; + + for (i = 0; i < view->nr; i++) { + memory_region_unref(view->ranges[i].mr); + } + g_free(view->ranges); + g_free(view); +} + +static void flatview_ref(FlatView *view) +{ + atomic_inc(&view->ref); +} + +static void flatview_unref(FlatView *view) +{ + if (atomic_fetch_dec(&view->ref) == 1) { + flatview_destroy(view); + } +} + +static bool can_merge(FlatRange *r1, FlatRange *r2) +{ + return int128_eq(addrrange_end(r1->addr), r2->addr.start) + && r1->mr == r2->mr + && int128_eq(int128_add(int128_make64(r1->offset_in_region), + r1->addr.size), + int128_make64(r2->offset_in_region)) + && r1->dirty_log_mask == r2->dirty_log_mask + && r1->romd_mode == r2->romd_mode + && r1->readonly == r2->readonly; +} + +/* Attempt to simplify a view by merging adjacent ranges */ +static void flatview_simplify(FlatView *view) +{ + unsigned i, j; + + i = 0; + while (i < view->nr) { + j = i + 1; + while (j < view->nr + && can_merge(&view->ranges[j-1], &view->ranges[j])) { + int128_addto(&view->ranges[i].addr.size, view->ranges[j].addr.size); + ++j; + } + ++i; + memmove(&view->ranges[i], &view->ranges[j], + (view->nr - j) * sizeof(view->ranges[j])); + view->nr -= j - i; + } +} + +static bool memory_region_big_endian(MemoryRegion *mr) +{ +#ifdef TARGET_WORDS_BIGENDIAN + return mr->ops->endianness != DEVICE_LITTLE_ENDIAN; +#else + return mr->ops->endianness == DEVICE_BIG_ENDIAN; +#endif +} + +static bool memory_region_wrong_endianness(MemoryRegion *mr) +{ +#ifdef TARGET_WORDS_BIGENDIAN + return mr->ops->endianness == DEVICE_LITTLE_ENDIAN; +#else + return mr->ops->endianness == DEVICE_BIG_ENDIAN; +#endif +} + +static void adjust_endianness(MemoryRegion *mr, uint64_t *data, unsigned size) +{ + if (memory_region_wrong_endianness(mr)) { + switch (size) { + case 1: + break; + case 2: + *data = bswap16(*data); + break; + case 4: + *data = bswap32(*data); + break; + case 8: + *data = bswap64(*data); + break; + default: + abort(); + } + } +} + +static MemTxResult memory_region_oldmmio_read_accessor(MemoryRegion *mr, + hwaddr addr, + uint64_t *value, + unsigned size, + unsigned shift, + uint64_t mask, + MemTxAttrs attrs) +{ + uint64_t tmp; + + tmp = mr->ops->old_mmio.read[ctz32(size)](mr->opaque, addr); + trace_memory_region_ops_read(mr, addr, tmp, size); + *value |= (tmp & mask) << shift; + return MEMTX_OK; +} + +static MemTxResult memory_region_read_accessor(MemoryRegion *mr, + hwaddr addr, + uint64_t *value, + unsigned size, + unsigned shift, + uint64_t mask, + MemTxAttrs attrs) +{ + uint64_t tmp; + + tmp = mr->ops->read(mr->opaque, addr, size); + trace_memory_region_ops_read(mr, addr, tmp, size); + *value |= (tmp & mask) << shift; + return MEMTX_OK; +} + +static MemTxResult memory_region_read_with_attrs_accessor(MemoryRegion *mr, + hwaddr addr, + uint64_t *value, + unsigned size, + unsigned shift, + uint64_t mask, + MemTxAttrs attrs) +{ + uint64_t tmp = 0; + MemTxResult r; + + r = mr->ops->read_with_attrs(mr->opaque, addr, &tmp, size, attrs); + trace_memory_region_ops_read(mr, addr, tmp, size); + *value |= (tmp & mask) << shift; + return r; +} + +static MemTxResult memory_region_oldmmio_write_accessor(MemoryRegion *mr, + hwaddr addr, + uint64_t *value, + unsigned size, + unsigned shift, + uint64_t mask, + MemTxAttrs attrs) +{ + uint64_t tmp; + + tmp = (*value >> shift) & mask; + trace_memory_region_ops_write(mr, addr, tmp, size); + mr->ops->old_mmio.write[ctz32(size)](mr->opaque, addr, tmp); + return MEMTX_OK; +} + +static MemTxResult memory_region_write_accessor(MemoryRegion *mr, + hwaddr addr, + uint64_t *value, + unsigned size, + unsigned shift, + uint64_t mask, + MemTxAttrs attrs) +{ + uint64_t tmp; + + tmp = (*value >> shift) & mask; + trace_memory_region_ops_write(mr, addr, tmp, size); + mr->ops->write(mr->opaque, addr, tmp, size); + return MEMTX_OK; +} + +static MemTxResult memory_region_write_with_attrs_accessor(MemoryRegion *mr, + hwaddr addr, + uint64_t *value, + unsigned size, + unsigned shift, + uint64_t mask, + MemTxAttrs attrs) +{ + uint64_t tmp; + + tmp = (*value >> shift) & mask; + trace_memory_region_ops_write(mr, addr, tmp, size); + return mr->ops->write_with_attrs(mr->opaque, addr, tmp, size, attrs); +} + +static MemTxResult access_with_adjusted_size(hwaddr addr, + uint64_t *value, + unsigned size, + unsigned access_size_min, + unsigned access_size_max, + MemTxResult (*access)(MemoryRegion *mr, + hwaddr addr, + uint64_t *value, + unsigned size, + unsigned shift, + uint64_t mask, + MemTxAttrs attrs), + MemoryRegion *mr, + MemTxAttrs attrs) +{ + uint64_t access_mask; + unsigned access_size; + unsigned i; + MemTxResult r = MEMTX_OK; + + if (!access_size_min) { + access_size_min = 1; + } + if (!access_size_max) { + access_size_max = 4; + } + + /* FIXME: support unaligned access? */ + access_size = MAX(MIN(size, access_size_max), access_size_min); + access_mask = -1ULL >> (64 - access_size * 8); + if (memory_region_big_endian(mr)) { + for (i = 0; i < size; i += access_size) { + r |= access(mr, addr + i, value, access_size, + (size - access_size - i) * 8, access_mask, attrs); + } + } else { + for (i = 0; i < size; i += access_size) { + r |= access(mr, addr + i, value, access_size, i * 8, + access_mask, attrs); + } + } + return r; +} + +static AddressSpace *memory_region_to_address_space(MemoryRegion *mr) +{ + AddressSpace *as; + + while (mr->container) { + mr = mr->container; + } + QTAILQ_FOREACH(as, &address_spaces, address_spaces_link) { + if (mr == as->root) { + return as; + } + } + return NULL; +} + +/* Render a memory region into the global view. Ranges in @view obscure + * ranges in @mr. + */ +static void render_memory_region(FlatView *view, + MemoryRegion *mr, + Int128 base, + AddrRange clip, + bool readonly) +{ + MemoryRegion *subregion; + unsigned i; + hwaddr offset_in_region; + Int128 remain; + Int128 now; + FlatRange fr; + AddrRange tmp; + + if (!mr->enabled) { + return; + } + + int128_addto(&base, int128_make64(mr->addr)); + readonly |= mr->readonly; + + tmp = addrrange_make(base, mr->size); + + if (!addrrange_intersects(tmp, clip)) { + return; + } + + clip = addrrange_intersection(tmp, clip); + + if (mr->alias) { + int128_subfrom(&base, int128_make64(mr->alias->addr)); + int128_subfrom(&base, int128_make64(mr->alias_offset)); + render_memory_region(view, mr->alias, base, clip, readonly); + return; + } + + /* Render subregions in priority order. */ + QTAILQ_FOREACH(subregion, &mr->subregions, subregions_link) { + render_memory_region(view, subregion, base, clip, readonly); + } + + if (!mr->terminates) { + return; + } + + offset_in_region = int128_get64(int128_sub(clip.start, base)); + base = clip.start; + remain = clip.size; + + fr.mr = mr; + fr.dirty_log_mask = memory_region_get_dirty_log_mask(mr); + fr.romd_mode = mr->romd_mode; + fr.readonly = readonly; + + /* Render the region itself into any gaps left by the current view. */ + for (i = 0; i < view->nr && int128_nz(remain); ++i) { + if (int128_ge(base, addrrange_end(view->ranges[i].addr))) { + continue; + } + if (int128_lt(base, view->ranges[i].addr.start)) { + now = int128_min(remain, + int128_sub(view->ranges[i].addr.start, base)); + fr.offset_in_region = offset_in_region; + fr.addr = addrrange_make(base, now); + flatview_insert(view, i, &fr); + ++i; + int128_addto(&base, now); + offset_in_region += int128_get64(now); + int128_subfrom(&remain, now); + } + now = int128_sub(int128_min(int128_add(base, remain), + addrrange_end(view->ranges[i].addr)), + base); + int128_addto(&base, now); + offset_in_region += int128_get64(now); + int128_subfrom(&remain, now); + } + if (int128_nz(remain)) { + fr.offset_in_region = offset_in_region; + fr.addr = addrrange_make(base, remain); + flatview_insert(view, i, &fr); + } +} + +/* Render a memory topology into a list of disjoint absolute ranges. */ +static FlatView *generate_memory_topology(MemoryRegion *mr) +{ + FlatView *view; + + view = g_new(FlatView, 1); + flatview_init(view); + + if (mr) { + render_memory_region(view, mr, int128_zero(), + addrrange_make(int128_zero(), int128_2_64()), false); + } + flatview_simplify(view); + + return view; +} + +static void address_space_add_del_ioeventfds(AddressSpace *as, + MemoryRegionIoeventfd *fds_new, + unsigned fds_new_nb, + MemoryRegionIoeventfd *fds_old, + unsigned fds_old_nb) +{ + unsigned iold, inew; + MemoryRegionIoeventfd *fd; + MemoryRegionSection section; + + /* Generate a symmetric difference of the old and new fd sets, adding + * and deleting as necessary. + */ + + iold = inew = 0; + while (iold < fds_old_nb || inew < fds_new_nb) { + if (iold < fds_old_nb + && (inew == fds_new_nb + || memory_region_ioeventfd_before(fds_old[iold], + fds_new[inew]))) { + fd = &fds_old[iold]; + section = (MemoryRegionSection) { + .address_space = as, + .offset_within_address_space = int128_get64(fd->addr.start), + .size = fd->addr.size, + }; + MEMORY_LISTENER_CALL(eventfd_del, Forward, §ion, + fd->match_data, fd->data, fd->e); + ++iold; + } else if (inew < fds_new_nb + && (iold == fds_old_nb + || memory_region_ioeventfd_before(fds_new[inew], + fds_old[iold]))) { + fd = &fds_new[inew]; + section = (MemoryRegionSection) { + .address_space = as, + .offset_within_address_space = int128_get64(fd->addr.start), + .size = fd->addr.size, + }; + MEMORY_LISTENER_CALL(eventfd_add, Reverse, §ion, + fd->match_data, fd->data, fd->e); + ++inew; + } else { + ++iold; + ++inew; + } + } +} + +static FlatView *address_space_get_flatview(AddressSpace *as) +{ + FlatView *view; + + rcu_read_lock(); + view = atomic_rcu_read(&as->current_map); + flatview_ref(view); + rcu_read_unlock(); + return view; +} + +static void address_space_update_ioeventfds(AddressSpace *as) +{ + FlatView *view; + FlatRange *fr; + unsigned ioeventfd_nb = 0; + MemoryRegionIoeventfd *ioeventfds = NULL; + AddrRange tmp; + unsigned i; + + view = address_space_get_flatview(as); + FOR_EACH_FLAT_RANGE(fr, view) { + for (i = 0; i < fr->mr->ioeventfd_nb; ++i) { + tmp = addrrange_shift(fr->mr->ioeventfds[i].addr, + int128_sub(fr->addr.start, + int128_make64(fr->offset_in_region))); + if (addrrange_intersects(fr->addr, tmp)) { + ++ioeventfd_nb; + ioeventfds = g_realloc(ioeventfds, + ioeventfd_nb * sizeof(*ioeventfds)); + ioeventfds[ioeventfd_nb-1] = fr->mr->ioeventfds[i]; + ioeventfds[ioeventfd_nb-1].addr = tmp; + } + } + } + + address_space_add_del_ioeventfds(as, ioeventfds, ioeventfd_nb, + as->ioeventfds, as->ioeventfd_nb); + + g_free(as->ioeventfds); + as->ioeventfds = ioeventfds; + as->ioeventfd_nb = ioeventfd_nb; + flatview_unref(view); +} + +static void address_space_update_topology_pass(AddressSpace *as, + const FlatView *old_view, + const FlatView *new_view, + bool adding) +{ + unsigned iold, inew; + FlatRange *frold, *frnew; + + /* Generate a symmetric difference of the old and new memory maps. + * Kill ranges in the old map, and instantiate ranges in the new map. + */ + iold = inew = 0; + while (iold < old_view->nr || inew < new_view->nr) { + if (iold < old_view->nr) { + frold = &old_view->ranges[iold]; + } else { + frold = NULL; + } + if (inew < new_view->nr) { + frnew = &new_view->ranges[inew]; + } else { + frnew = NULL; + } + + if (frold + && (!frnew + || int128_lt(frold->addr.start, frnew->addr.start) + || (int128_eq(frold->addr.start, frnew->addr.start) + && !flatrange_equal(frold, frnew)))) { + /* In old but not in new, or in both but attributes changed. */ + + if (!adding) { + MEMORY_LISTENER_UPDATE_REGION(frold, as, Reverse, region_del); + } + + ++iold; + } else if (frold && frnew && flatrange_equal(frold, frnew)) { + /* In both and unchanged (except logging may have changed) */ + + if (adding) { + MEMORY_LISTENER_UPDATE_REGION(frnew, as, Forward, region_nop); + if (frnew->dirty_log_mask & ~frold->dirty_log_mask) { + MEMORY_LISTENER_UPDATE_REGION(frnew, as, Forward, log_start, + frold->dirty_log_mask, + frnew->dirty_log_mask); + } + if (frold->dirty_log_mask & ~frnew->dirty_log_mask) { + MEMORY_LISTENER_UPDATE_REGION(frnew, as, Reverse, log_stop, + frold->dirty_log_mask, + frnew->dirty_log_mask); + } + } + + ++iold; + ++inew; + } else { + /* In new */ + + if (adding) { + MEMORY_LISTENER_UPDATE_REGION(frnew, as, Forward, region_add); + } + + ++inew; + } + } +} + + +static void address_space_update_topology(AddressSpace *as) +{ + FlatView *old_view = address_space_get_flatview(as); + FlatView *new_view = generate_memory_topology(as->root); + + address_space_update_topology_pass(as, old_view, new_view, false); + address_space_update_topology_pass(as, old_view, new_view, true); + + /* Writes are protected by the BQL. */ + atomic_rcu_set(&as->current_map, new_view); + call_rcu(old_view, flatview_unref, rcu); + + /* Note that all the old MemoryRegions are still alive up to this + * point. This relieves most MemoryListeners from the need to + * ref/unref the MemoryRegions they get---unless they use them + * outside the iothread mutex, in which case precise reference + * counting is necessary. + */ + flatview_unref(old_view); + + address_space_update_ioeventfds(as); +} + +void memory_region_transaction_begin(void) +{ + qemu_flush_coalesced_mmio_buffer(); + ++memory_region_transaction_depth; +} + +static void memory_region_clear_pending(void) +{ + memory_region_update_pending = false; + ioeventfd_update_pending = false; +} + +void memory_region_transaction_commit(void) +{ + AddressSpace *as; + + assert(memory_region_transaction_depth); + --memory_region_transaction_depth; + if (!memory_region_transaction_depth) { + if (memory_region_update_pending) { + MEMORY_LISTENER_CALL_GLOBAL(begin, Forward); + + QTAILQ_FOREACH(as, &address_spaces, address_spaces_link) { + address_space_update_topology(as); + } + + MEMORY_LISTENER_CALL_GLOBAL(commit, Forward); + } else if (ioeventfd_update_pending) { + QTAILQ_FOREACH(as, &address_spaces, address_spaces_link) { + address_space_update_ioeventfds(as); + } + } + memory_region_clear_pending(); + } +} + +static void memory_region_destructor_none(MemoryRegion *mr) +{ +} + +static void memory_region_destructor_ram(MemoryRegion *mr) +{ + qemu_ram_free(mr->ram_addr); +} + +static void memory_region_destructor_ram_from_ptr(MemoryRegion *mr) +{ + qemu_ram_free_from_ptr(mr->ram_addr); +} + +static void memory_region_destructor_rom_device(MemoryRegion *mr) +{ + qemu_ram_free(mr->ram_addr & TARGET_PAGE_MASK); +} + +static bool memory_region_need_escape(char c) +{ + return c == '/' || c == '[' || c == '\\' || c == ']'; +} + +static char *memory_region_escape_name(const char *name) +{ + const char *p; + char *escaped, *q; + uint8_t c; + size_t bytes = 0; + + for (p = name; *p; p++) { + bytes += memory_region_need_escape(*p) ? 4 : 1; + } + if (bytes == p - name) { + return g_memdup(name, bytes + 1); + } + + escaped = g_malloc(bytes + 1); + for (p = name, q = escaped; *p; p++) { + c = *p; + if (unlikely(memory_region_need_escape(c))) { + *q++ = '\\'; + *q++ = 'x'; + *q++ = "0123456789abcdef"[c >> 4]; + c = "0123456789abcdef"[c & 15]; + } + *q++ = c; + } + *q = 0; + return escaped; +} + +void memory_region_init(MemoryRegion *mr, + Object *owner, + const char *name, + uint64_t size) +{ + if (!owner) { + owner = container_get(qdev_get_machine(), "/unattached"); + } + + object_initialize(mr, sizeof(*mr), TYPE_MEMORY_REGION); + mr->size = int128_make64(size); + if (size == UINT64_MAX) { + mr->size = int128_2_64(); + } + mr->name = g_strdup(name); + + if (name) { + char *escaped_name = memory_region_escape_name(name); + char *name_array = g_strdup_printf("%s[*]", escaped_name); + object_property_add_child(owner, name_array, OBJECT(mr), &error_abort); + object_unref(OBJECT(mr)); + g_free(name_array); + g_free(escaped_name); + } +} + +static void memory_region_get_addr(Object *obj, Visitor *v, void *opaque, + const char *name, Error **errp) +{ + MemoryRegion *mr = MEMORY_REGION(obj); + uint64_t value = mr->addr; + + visit_type_uint64(v, &value, name, errp); +} + +static void memory_region_get_container(Object *obj, Visitor *v, void *opaque, + const char *name, Error **errp) +{ + MemoryRegion *mr = MEMORY_REGION(obj); + gchar *path = (gchar *)""; + + if (mr->container) { + path = object_get_canonical_path(OBJECT(mr->container)); + } + visit_type_str(v, &path, name, errp); + if (mr->container) { + g_free(path); + } +} + +static Object *memory_region_resolve_container(Object *obj, void *opaque, + const char *part) +{ + MemoryRegion *mr = MEMORY_REGION(obj); + + return OBJECT(mr->container); +} + +static void memory_region_get_priority(Object *obj, Visitor *v, void *opaque, + const char *name, Error **errp) +{ + MemoryRegion *mr = MEMORY_REGION(obj); + int32_t value = mr->priority; + + visit_type_int32(v, &value, name, errp); +} + +static bool memory_region_get_may_overlap(Object *obj, Error **errp) +{ + MemoryRegion *mr = MEMORY_REGION(obj); + + return mr->may_overlap; +} + +static void memory_region_get_size(Object *obj, Visitor *v, void *opaque, + const char *name, Error **errp) +{ + MemoryRegion *mr = MEMORY_REGION(obj); + uint64_t value = memory_region_size(mr); + + visit_type_uint64(v, &value, name, errp); +} + +static void memory_region_initfn(Object *obj) +{ + MemoryRegion *mr = MEMORY_REGION(obj); + ObjectProperty *op; + + mr->ops = &unassigned_mem_ops; + mr->ram_addr = RAM_ADDR_INVALID; + mr->enabled = true; + mr->romd_mode = true; + mr->global_locking = true; + mr->destructor = memory_region_destructor_none; + QTAILQ_INIT(&mr->subregions); + QTAILQ_INIT(&mr->coalesced); + + op = object_property_add(OBJECT(mr), "container", + "link<" TYPE_MEMORY_REGION ">", + memory_region_get_container, + NULL, /* memory_region_set_container */ + NULL, NULL, &error_abort); + op->resolve = memory_region_resolve_container; + + object_property_add(OBJECT(mr), "addr", "uint64", + memory_region_get_addr, + NULL, /* memory_region_set_addr */ + NULL, NULL, &error_abort); + object_property_add(OBJECT(mr), "priority", "uint32", + memory_region_get_priority, + NULL, /* memory_region_set_priority */ + NULL, NULL, &error_abort); + object_property_add_bool(OBJECT(mr), "may-overlap", + memory_region_get_may_overlap, + NULL, /* memory_region_set_may_overlap */ + &error_abort); + object_property_add(OBJECT(mr), "size", "uint64", + memory_region_get_size, + NULL, /* memory_region_set_size, */ + NULL, NULL, &error_abort); +} + +static uint64_t unassigned_mem_read(void *opaque, hwaddr addr, + unsigned size) +{ +#ifdef DEBUG_UNASSIGNED + printf("Unassigned mem read " TARGET_FMT_plx "\n", addr); +#endif + if (current_cpu != NULL) { + cpu_unassigned_access(current_cpu, addr, false, false, 0, size); + } + return 0; +} + +static void unassigned_mem_write(void *opaque, hwaddr addr, + uint64_t val, unsigned size) +{ +#ifdef DEBUG_UNASSIGNED + printf("Unassigned mem write " TARGET_FMT_plx " = 0x%"PRIx64"\n", addr, val); +#endif + if (current_cpu != NULL) { + cpu_unassigned_access(current_cpu, addr, true, false, 0, size); + } +} + +static bool unassigned_mem_accepts(void *opaque, hwaddr addr, + unsigned size, bool is_write) +{ + return false; +} + +const MemoryRegionOps unassigned_mem_ops = { + .valid.accepts = unassigned_mem_accepts, + .endianness = DEVICE_NATIVE_ENDIAN, +}; + +bool memory_region_access_valid(MemoryRegion *mr, + hwaddr addr, + unsigned size, + bool is_write) +{ + int access_size_min, access_size_max; + int access_size, i; + + if (!mr->ops->valid.unaligned && (addr & (size - 1))) { + return false; + } + + if (!mr->ops->valid.accepts) { + return true; + } + + access_size_min = mr->ops->valid.min_access_size; + if (!mr->ops->valid.min_access_size) { + access_size_min = 1; + } + + access_size_max = mr->ops->valid.max_access_size; + if (!mr->ops->valid.max_access_size) { + access_size_max = 4; + } + + access_size = MAX(MIN(size, access_size_max), access_size_min); + for (i = 0; i < size; i += access_size) { + if (!mr->ops->valid.accepts(mr->opaque, addr + i, access_size, + is_write)) { + return false; + } + } + + return true; +} + +static MemTxResult memory_region_dispatch_read1(MemoryRegion *mr, + hwaddr addr, + uint64_t *pval, + unsigned size, + MemTxAttrs attrs) +{ + *pval = 0; + + if (mr->ops->read) { + return access_with_adjusted_size(addr, pval, size, + mr->ops->impl.min_access_size, + mr->ops->impl.max_access_size, + memory_region_read_accessor, + mr, attrs); + } else if (mr->ops->read_with_attrs) { + return access_with_adjusted_size(addr, pval, size, + mr->ops->impl.min_access_size, + mr->ops->impl.max_access_size, + memory_region_read_with_attrs_accessor, + mr, attrs); + } else { + return access_with_adjusted_size(addr, pval, size, 1, 4, + memory_region_oldmmio_read_accessor, + mr, attrs); + } +} + +MemTxResult memory_region_dispatch_read(MemoryRegion *mr, + hwaddr addr, + uint64_t *pval, + unsigned size, + MemTxAttrs attrs) +{ + MemTxResult r; + + if (!memory_region_access_valid(mr, addr, size, false)) { + *pval = unassigned_mem_read(mr, addr, size); + return MEMTX_DECODE_ERROR; + } + + r = memory_region_dispatch_read1(mr, addr, pval, size, attrs); + adjust_endianness(mr, pval, size); + return r; +} + +MemTxResult memory_region_dispatch_write(MemoryRegion *mr, + hwaddr addr, + uint64_t data, + unsigned size, + MemTxAttrs attrs) +{ + if (!memory_region_access_valid(mr, addr, size, true)) { + unassigned_mem_write(mr, addr, data, size); + return MEMTX_DECODE_ERROR; + } + + adjust_endianness(mr, &data, size); + + if (mr->ops->write) { + return access_with_adjusted_size(addr, &data, size, + mr->ops->impl.min_access_size, + mr->ops->impl.max_access_size, + memory_region_write_accessor, mr, + attrs); + } else if (mr->ops->write_with_attrs) { + return + access_with_adjusted_size(addr, &data, size, + mr->ops->impl.min_access_size, + mr->ops->impl.max_access_size, + memory_region_write_with_attrs_accessor, + mr, attrs); + } else { + return access_with_adjusted_size(addr, &data, size, 1, 4, + memory_region_oldmmio_write_accessor, + mr, attrs); + } +} + +void memory_region_init_io(MemoryRegion *mr, + Object *owner, + const MemoryRegionOps *ops, + void *opaque, + const char *name, + uint64_t size) +{ + memory_region_init(mr, owner, name, size); + mr->ops = ops; + mr->opaque = opaque; + mr->terminates = true; +} + +void memory_region_init_ram(MemoryRegion *mr, + Object *owner, + const char *name, + uint64_t size, + Error **errp) +{ + memory_region_init(mr, owner, name, size); + mr->ram = true; + mr->terminates = true; + mr->destructor = memory_region_destructor_ram; + mr->ram_addr = qemu_ram_alloc(size, mr, errp); + mr->dirty_log_mask = tcg_enabled() ? (1 << DIRTY_MEMORY_CODE) : 0; +} + +void memory_region_init_resizeable_ram(MemoryRegion *mr, + Object *owner, + const char *name, + uint64_t size, + uint64_t max_size, + void (*resized)(const char*, + uint64_t length, + void *host), + Error **errp) +{ + memory_region_init(mr, owner, name, size); + mr->ram = true; + mr->terminates = true; + mr->destructor = memory_region_destructor_ram; + mr->ram_addr = qemu_ram_alloc_resizeable(size, max_size, resized, mr, errp); + mr->dirty_log_mask = tcg_enabled() ? (1 << DIRTY_MEMORY_CODE) : 0; +} + +#ifdef __linux__ +void memory_region_init_ram_from_file(MemoryRegion *mr, + struct Object *owner, + const char *name, + uint64_t size, + bool share, + const char *path, + Error **errp) +{ + memory_region_init(mr, owner, name, size); + mr->ram = true; + mr->terminates = true; + mr->destructor = memory_region_destructor_ram; + mr->ram_addr = qemu_ram_alloc_from_file(size, mr, share, path, errp); + mr->dirty_log_mask = tcg_enabled() ? (1 << DIRTY_MEMORY_CODE) : 0; +} +#endif + +void memory_region_init_ram_ptr(MemoryRegion *mr, + Object *owner, + const char *name, + uint64_t size, + void *ptr) +{ + memory_region_init(mr, owner, name, size); + mr->ram = true; + mr->terminates = true; + mr->destructor = memory_region_destructor_ram_from_ptr; + mr->dirty_log_mask = tcg_enabled() ? (1 << DIRTY_MEMORY_CODE) : 0; + + /* qemu_ram_alloc_from_ptr cannot fail with ptr != NULL. */ + assert(ptr != NULL); + mr->ram_addr = qemu_ram_alloc_from_ptr(size, ptr, mr, &error_abort); +} + +void memory_region_set_skip_dump(MemoryRegion *mr) +{ + mr->skip_dump = true; +} + +void memory_region_init_alias(MemoryRegion *mr, + Object *owner, + const char *name, + MemoryRegion *orig, + hwaddr offset, + uint64_t size) +{ + memory_region_init(mr, owner, name, size); + mr->alias = orig; + mr->alias_offset = offset; +} + +void memory_region_init_rom_device(MemoryRegion *mr, + Object *owner, + const MemoryRegionOps *ops, + void *opaque, + const char *name, + uint64_t size, + Error **errp) +{ + memory_region_init(mr, owner, name, size); + mr->ops = ops; + mr->opaque = opaque; + mr->terminates = true; + mr->rom_device = true; + mr->destructor = memory_region_destructor_rom_device; + mr->ram_addr = qemu_ram_alloc(size, mr, errp); +} + +void memory_region_init_iommu(MemoryRegion *mr, + Object *owner, + const MemoryRegionIOMMUOps *ops, + const char *name, + uint64_t size) +{ + memory_region_init(mr, owner, name, size); + mr->iommu_ops = ops, + mr->terminates = true; /* then re-forwards */ + notifier_list_init(&mr->iommu_notify); +} + +void memory_region_init_reservation(MemoryRegion *mr, + Object *owner, + const char *name, + uint64_t size) +{ + memory_region_init_io(mr, owner, &unassigned_mem_ops, mr, name, size); +} + +static void memory_region_finalize(Object *obj) +{ + MemoryRegion *mr = MEMORY_REGION(obj); + + assert(!mr->container); + + /* We know the region is not visible in any address space (it + * does not have a container and cannot be a root either because + * it has no references, so we can blindly clear mr->enabled. + * memory_region_set_enabled instead could trigger a transaction + * and cause an infinite loop. + */ + mr->enabled = false; + memory_region_transaction_begin(); + while (!QTAILQ_EMPTY(&mr->subregions)) { + MemoryRegion *subregion = QTAILQ_FIRST(&mr->subregions); + memory_region_del_subregion(mr, subregion); + } + memory_region_transaction_commit(); + + mr->destructor(mr); + memory_region_clear_coalescing(mr); + g_free((char *)mr->name); + g_free(mr->ioeventfds); +} + +Object *memory_region_owner(MemoryRegion *mr) +{ + Object *obj = OBJECT(mr); + return obj->parent; +} + +void memory_region_ref(MemoryRegion *mr) +{ + /* MMIO callbacks most likely will access data that belongs + * to the owner, hence the need to ref/unref the owner whenever + * the memory region is in use. + * + * The memory region is a child of its owner. As long as the + * owner doesn't call unparent itself on the memory region, + * ref-ing the owner will also keep the memory region alive. + * Memory regions without an owner are supposed to never go away, + * but we still ref/unref them for debugging purposes. + */ + Object *obj = OBJECT(mr); + if (obj && obj->parent) { + object_ref(obj->parent); + } else { + object_ref(obj); + } +} + +void memory_region_unref(MemoryRegion *mr) +{ + Object *obj = OBJECT(mr); + if (obj && obj->parent) { + object_unref(obj->parent); + } else { + object_unref(obj); + } +} + +uint64_t memory_region_size(MemoryRegion *mr) +{ + if (int128_eq(mr->size, int128_2_64())) { + return UINT64_MAX; + } + return int128_get64(mr->size); +} + +const char *memory_region_name(const MemoryRegion *mr) +{ + if (!mr->name) { + ((MemoryRegion *)mr)->name = + object_get_canonical_path_component(OBJECT(mr)); + } + return mr->name; +} + +bool memory_region_is_ram(MemoryRegion *mr) +{ + return mr->ram; +} + +bool memory_region_is_skip_dump(MemoryRegion *mr) +{ + return mr->skip_dump; +} + +uint8_t memory_region_get_dirty_log_mask(MemoryRegion *mr) +{ + uint8_t mask = mr->dirty_log_mask; + if (global_dirty_log) { + mask |= (1 << DIRTY_MEMORY_MIGRATION); + } + return mask; +} + +bool memory_region_is_logging(MemoryRegion *mr, uint8_t client) +{ + return memory_region_get_dirty_log_mask(mr) & (1 << client); +} + +bool memory_region_is_rom(MemoryRegion *mr) +{ + return mr->ram && mr->readonly; +} + +bool memory_region_is_iommu(MemoryRegion *mr) +{ + return mr->iommu_ops; +} + +void memory_region_register_iommu_notifier(MemoryRegion *mr, Notifier *n) +{ + notifier_list_add(&mr->iommu_notify, n); +} + +void memory_region_unregister_iommu_notifier(Notifier *n) +{ + notifier_remove(n); +} + +void memory_region_notify_iommu(MemoryRegion *mr, + IOMMUTLBEntry entry) +{ + assert(memory_region_is_iommu(mr)); + notifier_list_notify(&mr->iommu_notify, &entry); +} + +void memory_region_set_log(MemoryRegion *mr, bool log, unsigned client) +{ + uint8_t mask = 1 << client; + uint8_t old_logging; + + assert(client == DIRTY_MEMORY_VGA); + old_logging = mr->vga_logging_count; + mr->vga_logging_count += log ? 1 : -1; + if (!!old_logging == !!mr->vga_logging_count) { + return; + } + + memory_region_transaction_begin(); + mr->dirty_log_mask = (mr->dirty_log_mask & ~mask) | (log * mask); + memory_region_update_pending |= mr->enabled; + memory_region_transaction_commit(); +} + +bool memory_region_get_dirty(MemoryRegion *mr, hwaddr addr, + hwaddr size, unsigned client) +{ + assert(mr->ram_addr != RAM_ADDR_INVALID); + return cpu_physical_memory_get_dirty(mr->ram_addr + addr, size, client); +} + +void memory_region_set_dirty(MemoryRegion *mr, hwaddr addr, + hwaddr size) +{ + assert(mr->ram_addr != RAM_ADDR_INVALID); + cpu_physical_memory_set_dirty_range(mr->ram_addr + addr, size, + memory_region_get_dirty_log_mask(mr)); +} + +bool memory_region_test_and_clear_dirty(MemoryRegion *mr, hwaddr addr, + hwaddr size, unsigned client) +{ + assert(mr->ram_addr != RAM_ADDR_INVALID); + return cpu_physical_memory_test_and_clear_dirty(mr->ram_addr + addr, + size, client); +} + + +void memory_region_sync_dirty_bitmap(MemoryRegion *mr) +{ + AddressSpace *as; + FlatRange *fr; + + QTAILQ_FOREACH(as, &address_spaces, address_spaces_link) { + FlatView *view = address_space_get_flatview(as); + FOR_EACH_FLAT_RANGE(fr, view) { + if (fr->mr == mr) { + MEMORY_LISTENER_UPDATE_REGION(fr, as, Forward, log_sync); + } + } + flatview_unref(view); + } +} + +void memory_region_set_readonly(MemoryRegion *mr, bool readonly) +{ + if (mr->readonly != readonly) { + memory_region_transaction_begin(); + mr->readonly = readonly; + memory_region_update_pending |= mr->enabled; + memory_region_transaction_commit(); + } +} + +void memory_region_rom_device_set_romd(MemoryRegion *mr, bool romd_mode) +{ + if (mr->romd_mode != romd_mode) { + memory_region_transaction_begin(); + mr->romd_mode = romd_mode; + memory_region_update_pending |= mr->enabled; + memory_region_transaction_commit(); + } +} + +void memory_region_reset_dirty(MemoryRegion *mr, hwaddr addr, + hwaddr size, unsigned client) +{ + assert(mr->ram_addr != RAM_ADDR_INVALID); + cpu_physical_memory_test_and_clear_dirty(mr->ram_addr + addr, size, + client); +} + +int memory_region_get_fd(MemoryRegion *mr) +{ + if (mr->alias) { + return memory_region_get_fd(mr->alias); + } + + assert(mr->ram_addr != RAM_ADDR_INVALID); + + return qemu_get_ram_fd(mr->ram_addr & TARGET_PAGE_MASK); +} + +void *memory_region_get_ram_ptr(MemoryRegion *mr) +{ + if (mr->alias) { + return memory_region_get_ram_ptr(mr->alias) + mr->alias_offset; + } + + assert(mr->ram_addr != RAM_ADDR_INVALID); + + return qemu_get_ram_ptr(mr->ram_addr & TARGET_PAGE_MASK); +} + +void memory_region_ram_resize(MemoryRegion *mr, ram_addr_t newsize, Error **errp) +{ + assert(mr->ram_addr != RAM_ADDR_INVALID); + + qemu_ram_resize(mr->ram_addr, newsize, errp); +} + +static void memory_region_update_coalesced_range_as(MemoryRegion *mr, AddressSpace *as) +{ + FlatView *view; + FlatRange *fr; + CoalescedMemoryRange *cmr; + AddrRange tmp; + MemoryRegionSection section; + + view = address_space_get_flatview(as); + FOR_EACH_FLAT_RANGE(fr, view) { + if (fr->mr == mr) { + section = (MemoryRegionSection) { + .address_space = as, + .offset_within_address_space = int128_get64(fr->addr.start), + .size = fr->addr.size, + }; + + MEMORY_LISTENER_CALL(coalesced_mmio_del, Reverse, §ion, + int128_get64(fr->addr.start), + int128_get64(fr->addr.size)); + QTAILQ_FOREACH(cmr, &mr->coalesced, link) { + tmp = addrrange_shift(cmr->addr, + int128_sub(fr->addr.start, + int128_make64(fr->offset_in_region))); + if (!addrrange_intersects(tmp, fr->addr)) { + continue; + } + tmp = addrrange_intersection(tmp, fr->addr); + MEMORY_LISTENER_CALL(coalesced_mmio_add, Forward, §ion, + int128_get64(tmp.start), + int128_get64(tmp.size)); + } + } + } + flatview_unref(view); +} + +static void memory_region_update_coalesced_range(MemoryRegion *mr) +{ + AddressSpace *as; + + QTAILQ_FOREACH(as, &address_spaces, address_spaces_link) { + memory_region_update_coalesced_range_as(mr, as); + } +} + +void memory_region_set_coalescing(MemoryRegion *mr) +{ + memory_region_clear_coalescing(mr); + memory_region_add_coalescing(mr, 0, int128_get64(mr->size)); +} + +void memory_region_add_coalescing(MemoryRegion *mr, + hwaddr offset, + uint64_t size) +{ + CoalescedMemoryRange *cmr = g_malloc(sizeof(*cmr)); + + cmr->addr = addrrange_make(int128_make64(offset), int128_make64(size)); + QTAILQ_INSERT_TAIL(&mr->coalesced, cmr, link); + memory_region_update_coalesced_range(mr); + memory_region_set_flush_coalesced(mr); +} + +void memory_region_clear_coalescing(MemoryRegion *mr) +{ + CoalescedMemoryRange *cmr; + bool updated = false; + + qemu_flush_coalesced_mmio_buffer(); + mr->flush_coalesced_mmio = false; + + while (!QTAILQ_EMPTY(&mr->coalesced)) { + cmr = QTAILQ_FIRST(&mr->coalesced); + QTAILQ_REMOVE(&mr->coalesced, cmr, link); + g_free(cmr); + updated = true; + } + + if (updated) { + memory_region_update_coalesced_range(mr); + } +} + +void memory_region_set_flush_coalesced(MemoryRegion *mr) +{ + mr->flush_coalesced_mmio = true; +} + +void memory_region_clear_flush_coalesced(MemoryRegion *mr) +{ + qemu_flush_coalesced_mmio_buffer(); + if (QTAILQ_EMPTY(&mr->coalesced)) { + mr->flush_coalesced_mmio = false; + } +} + +void memory_region_set_global_locking(MemoryRegion *mr) +{ + mr->global_locking = true; +} + +void memory_region_clear_global_locking(MemoryRegion *mr) +{ + mr->global_locking = false; +} + +void memory_region_add_eventfd(MemoryRegion *mr, + hwaddr addr, + unsigned size, + bool match_data, + uint64_t data, + EventNotifier *e) +{ + MemoryRegionIoeventfd mrfd = { + .addr.start = int128_make64(addr), + .addr.size = int128_make64(size), + .match_data = match_data, + .data = data, + .e = e, + }; + unsigned i; + + adjust_endianness(mr, &mrfd.data, size); + memory_region_transaction_begin(); + for (i = 0; i < mr->ioeventfd_nb; ++i) { + if (memory_region_ioeventfd_before(mrfd, mr->ioeventfds[i])) { + break; + } + } + ++mr->ioeventfd_nb; + mr->ioeventfds = g_realloc(mr->ioeventfds, + sizeof(*mr->ioeventfds) * mr->ioeventfd_nb); + memmove(&mr->ioeventfds[i+1], &mr->ioeventfds[i], + sizeof(*mr->ioeventfds) * (mr->ioeventfd_nb-1 - i)); + mr->ioeventfds[i] = mrfd; + ioeventfd_update_pending |= mr->enabled; + memory_region_transaction_commit(); +} + +void memory_region_del_eventfd(MemoryRegion *mr, + hwaddr addr, + unsigned size, + bool match_data, + uint64_t data, + EventNotifier *e) +{ + MemoryRegionIoeventfd mrfd = { + .addr.start = int128_make64(addr), + .addr.size = int128_make64(size), + .match_data = match_data, + .data = data, + .e = e, + }; + unsigned i; + + adjust_endianness(mr, &mrfd.data, size); + memory_region_transaction_begin(); + for (i = 0; i < mr->ioeventfd_nb; ++i) { + if (memory_region_ioeventfd_equal(mrfd, mr->ioeventfds[i])) { + break; + } + } + assert(i != mr->ioeventfd_nb); + memmove(&mr->ioeventfds[i], &mr->ioeventfds[i+1], + sizeof(*mr->ioeventfds) * (mr->ioeventfd_nb - (i+1))); + --mr->ioeventfd_nb; + mr->ioeventfds = g_realloc(mr->ioeventfds, + sizeof(*mr->ioeventfds)*mr->ioeventfd_nb + 1); + ioeventfd_update_pending |= mr->enabled; + memory_region_transaction_commit(); +} + +static void memory_region_update_container_subregions(MemoryRegion *subregion) +{ + hwaddr offset = subregion->addr; + MemoryRegion *mr = subregion->container; + MemoryRegion *other; + + memory_region_transaction_begin(); + + memory_region_ref(subregion); + QTAILQ_FOREACH(other, &mr->subregions, subregions_link) { + if (subregion->may_overlap || other->may_overlap) { + continue; + } + if (int128_ge(int128_make64(offset), + int128_add(int128_make64(other->addr), other->size)) + || int128_le(int128_add(int128_make64(offset), subregion->size), + int128_make64(other->addr))) { + continue; + } +#if 0 + printf("warning: subregion collision %llx/%llx (%s) " + "vs %llx/%llx (%s)\n", + (unsigned long long)offset, + (unsigned long long)int128_get64(subregion->size), + subregion->name, + (unsigned long long)other->addr, + (unsigned long long)int128_get64(other->size), + other->name); +#endif + } + QTAILQ_FOREACH(other, &mr->subregions, subregions_link) { + if (subregion->priority >= other->priority) { + QTAILQ_INSERT_BEFORE(other, subregion, subregions_link); + goto done; + } + } + QTAILQ_INSERT_TAIL(&mr->subregions, subregion, subregions_link); +done: + memory_region_update_pending |= mr->enabled && subregion->enabled; + memory_region_transaction_commit(); +} + +static void memory_region_add_subregion_common(MemoryRegion *mr, + hwaddr offset, + MemoryRegion *subregion) +{ + assert(!subregion->container); + subregion->container = mr; + subregion->addr = offset; + memory_region_update_container_subregions(subregion); +} + +void memory_region_add_subregion(MemoryRegion *mr, + hwaddr offset, + MemoryRegion *subregion) +{ + subregion->may_overlap = false; + subregion->priority = 0; + memory_region_add_subregion_common(mr, offset, subregion); +} + +void memory_region_add_subregion_overlap(MemoryRegion *mr, + hwaddr offset, + MemoryRegion *subregion, + int priority) +{ + subregion->may_overlap = true; + subregion->priority = priority; + memory_region_add_subregion_common(mr, offset, subregion); +} + +void memory_region_del_subregion(MemoryRegion *mr, + MemoryRegion *subregion) +{ + memory_region_transaction_begin(); + assert(subregion->container == mr); + subregion->container = NULL; + QTAILQ_REMOVE(&mr->subregions, subregion, subregions_link); + memory_region_unref(subregion); + memory_region_update_pending |= mr->enabled && subregion->enabled; + memory_region_transaction_commit(); +} + +void memory_region_set_enabled(MemoryRegion *mr, bool enabled) +{ + if (enabled == mr->enabled) { + return; + } + memory_region_transaction_begin(); + mr->enabled = enabled; + memory_region_update_pending = true; + memory_region_transaction_commit(); +} + +void memory_region_set_size(MemoryRegion *mr, uint64_t size) +{ + Int128 s = int128_make64(size); + + if (size == UINT64_MAX) { + s = int128_2_64(); + } + if (int128_eq(s, mr->size)) { + return; + } + memory_region_transaction_begin(); + mr->size = s; + memory_region_update_pending = true; + memory_region_transaction_commit(); +} + +static void memory_region_readd_subregion(MemoryRegion *mr) +{ + MemoryRegion *container = mr->container; + + if (container) { + memory_region_transaction_begin(); + memory_region_ref(mr); + memory_region_del_subregion(container, mr); + mr->container = container; + memory_region_update_container_subregions(mr); + memory_region_unref(mr); + memory_region_transaction_commit(); + } +} + +void memory_region_set_address(MemoryRegion *mr, hwaddr addr) +{ + if (addr != mr->addr) { + mr->addr = addr; + memory_region_readd_subregion(mr); + } +} + +void memory_region_set_alias_offset(MemoryRegion *mr, hwaddr offset) +{ + assert(mr->alias); + + if (offset == mr->alias_offset) { + return; + } + + memory_region_transaction_begin(); + mr->alias_offset = offset; + memory_region_update_pending |= mr->enabled; + memory_region_transaction_commit(); +} + +ram_addr_t memory_region_get_ram_addr(MemoryRegion *mr) +{ + return mr->ram_addr; +} + +uint64_t memory_region_get_alignment(const MemoryRegion *mr) +{ + return mr->align; +} + +static int cmp_flatrange_addr(const void *addr_, const void *fr_) +{ + const AddrRange *addr = addr_; + const FlatRange *fr = fr_; + + if (int128_le(addrrange_end(*addr), fr->addr.start)) { + return -1; + } else if (int128_ge(addr->start, addrrange_end(fr->addr))) { + return 1; + } + return 0; +} + +static FlatRange *flatview_lookup(FlatView *view, AddrRange addr) +{ + return bsearch(&addr, view->ranges, view->nr, + sizeof(FlatRange), cmp_flatrange_addr); +} + +bool memory_region_is_mapped(MemoryRegion *mr) +{ + return mr->container ? true : false; +} + +/* Same as memory_region_find, but it does not add a reference to the + * returned region. It must be called from an RCU critical section. + */ +static MemoryRegionSection memory_region_find_rcu(MemoryRegion *mr, + hwaddr addr, uint64_t size) +{ + MemoryRegionSection ret = { .mr = NULL }; + MemoryRegion *root; + AddressSpace *as; + AddrRange range; + FlatView *view; + FlatRange *fr; + + addr += mr->addr; + for (root = mr; root->container; ) { + root = root->container; + addr += root->addr; + } + + as = memory_region_to_address_space(root); + if (!as) { + return ret; + } + range = addrrange_make(int128_make64(addr), int128_make64(size)); + + view = atomic_rcu_read(&as->current_map); + fr = flatview_lookup(view, range); + if (!fr) { + return ret; + } + + while (fr > view->ranges && addrrange_intersects(fr[-1].addr, range)) { + --fr; + } + + ret.mr = fr->mr; + ret.address_space = as; + range = addrrange_intersection(range, fr->addr); + ret.offset_within_region = fr->offset_in_region; + ret.offset_within_region += int128_get64(int128_sub(range.start, + fr->addr.start)); + ret.size = range.size; + ret.offset_within_address_space = int128_get64(range.start); + ret.readonly = fr->readonly; + return ret; +} + +MemoryRegionSection memory_region_find(MemoryRegion *mr, + hwaddr addr, uint64_t size) +{ + MemoryRegionSection ret; + rcu_read_lock(); + ret = memory_region_find_rcu(mr, addr, size); + if (ret.mr) { + memory_region_ref(ret.mr); + } + rcu_read_unlock(); + return ret; +} + +bool memory_region_present(MemoryRegion *container, hwaddr addr) +{ + MemoryRegion *mr; + + rcu_read_lock(); + mr = memory_region_find_rcu(container, addr, 1).mr; + rcu_read_unlock(); + return mr && mr != container; +} + +void address_space_sync_dirty_bitmap(AddressSpace *as) +{ + FlatView *view; + FlatRange *fr; + + view = address_space_get_flatview(as); + FOR_EACH_FLAT_RANGE(fr, view) { + MEMORY_LISTENER_UPDATE_REGION(fr, as, Forward, log_sync); + } + flatview_unref(view); +} + +void memory_global_dirty_log_start(void) +{ + global_dirty_log = true; + + MEMORY_LISTENER_CALL_GLOBAL(log_global_start, Forward); + + /* Refresh DIRTY_LOG_MIGRATION bit. */ + memory_region_transaction_begin(); + memory_region_update_pending = true; + memory_region_transaction_commit(); +} + +void memory_global_dirty_log_stop(void) +{ + global_dirty_log = false; + + /* Refresh DIRTY_LOG_MIGRATION bit. */ + memory_region_transaction_begin(); + memory_region_update_pending = true; + memory_region_transaction_commit(); + + MEMORY_LISTENER_CALL_GLOBAL(log_global_stop, Reverse); +} + +static void listener_add_address_space(MemoryListener *listener, + AddressSpace *as) +{ + FlatView *view; + FlatRange *fr; + + if (listener->address_space_filter + && listener->address_space_filter != as) { + return; + } + + if (global_dirty_log) { + if (listener->log_global_start) { + listener->log_global_start(listener); + } + } + + view = address_space_get_flatview(as); + FOR_EACH_FLAT_RANGE(fr, view) { + MemoryRegionSection section = { + .mr = fr->mr, + .address_space = as, + .offset_within_region = fr->offset_in_region, + .size = fr->addr.size, + .offset_within_address_space = int128_get64(fr->addr.start), + .readonly = fr->readonly, + }; + if (listener->region_add) { + listener->region_add(listener, §ion); + } + } + flatview_unref(view); +} + +void memory_listener_register(MemoryListener *listener, AddressSpace *filter) +{ + MemoryListener *other = NULL; + AddressSpace *as; + + listener->address_space_filter = filter; + if (QTAILQ_EMPTY(&memory_listeners) + || listener->priority >= QTAILQ_LAST(&memory_listeners, + memory_listeners)->priority) { + QTAILQ_INSERT_TAIL(&memory_listeners, listener, link); + } else { + QTAILQ_FOREACH(other, &memory_listeners, link) { + if (listener->priority < other->priority) { + break; + } + } + QTAILQ_INSERT_BEFORE(other, listener, link); + } + + QTAILQ_FOREACH(as, &address_spaces, address_spaces_link) { + listener_add_address_space(listener, as); + } +} + +void memory_listener_unregister(MemoryListener *listener) +{ + QTAILQ_REMOVE(&memory_listeners, listener, link); +} + +void address_space_init(AddressSpace *as, MemoryRegion *root, const char *name) +{ + memory_region_ref(root); + memory_region_transaction_begin(); + as->root = root; + as->current_map = g_new(FlatView, 1); + flatview_init(as->current_map); + as->ioeventfd_nb = 0; + as->ioeventfds = NULL; + QTAILQ_INSERT_TAIL(&address_spaces, as, address_spaces_link); + as->name = g_strdup(name ? name : "anonymous"); + address_space_init_dispatch(as); + memory_region_update_pending |= root->enabled; + memory_region_transaction_commit(); +} + +static void do_address_space_destroy(AddressSpace *as) +{ + MemoryListener *listener; + + address_space_destroy_dispatch(as); + + QTAILQ_FOREACH(listener, &memory_listeners, link) { + assert(listener->address_space_filter != as); + } + + flatview_unref(as->current_map); + g_free(as->name); + g_free(as->ioeventfds); + memory_region_unref(as->root); +} + +void address_space_destroy(AddressSpace *as) +{ + MemoryRegion *root = as->root; + + /* Flush out anything from MemoryListeners listening in on this */ + memory_region_transaction_begin(); + as->root = NULL; + memory_region_transaction_commit(); + QTAILQ_REMOVE(&address_spaces, as, address_spaces_link); + address_space_unregister(as); + + /* At this point, as->dispatch and as->current_map are dummy + * entries that the guest should never use. Wait for the old + * values to expire before freeing the data. + */ + as->root = root; + call_rcu(as, do_address_space_destroy, rcu); +} + +typedef struct MemoryRegionList MemoryRegionList; + +struct MemoryRegionList { + const MemoryRegion *mr; + QTAILQ_ENTRY(MemoryRegionList) queue; +}; + +typedef QTAILQ_HEAD(queue, MemoryRegionList) MemoryRegionListHead; + +static void mtree_print_mr(fprintf_function mon_printf, void *f, + const MemoryRegion *mr, unsigned int level, + hwaddr base, + MemoryRegionListHead *alias_print_queue) +{ + MemoryRegionList *new_ml, *ml, *next_ml; + MemoryRegionListHead submr_print_queue; + const MemoryRegion *submr; + unsigned int i; + + if (!mr) { + return; + } + + for (i = 0; i < level; i++) { + mon_printf(f, " "); + } + + if (mr->alias) { + MemoryRegionList *ml; + bool found = false; + + /* check if the alias is already in the queue */ + QTAILQ_FOREACH(ml, alias_print_queue, queue) { + if (ml->mr == mr->alias) { + found = true; + } + } + + if (!found) { + ml = g_new(MemoryRegionList, 1); + ml->mr = mr->alias; + QTAILQ_INSERT_TAIL(alias_print_queue, ml, queue); + } + mon_printf(f, TARGET_FMT_plx "-" TARGET_FMT_plx + " (prio %d, %c%c): alias %s @%s " TARGET_FMT_plx + "-" TARGET_FMT_plx "%s\n", + base + mr->addr, + base + mr->addr + + (int128_nz(mr->size) ? + (hwaddr)int128_get64(int128_sub(mr->size, + int128_one())) : 0), + mr->priority, + mr->romd_mode ? 'R' : '-', + !mr->readonly && !(mr->rom_device && mr->romd_mode) ? 'W' + : '-', + memory_region_name(mr), + memory_region_name(mr->alias), + mr->alias_offset, + mr->alias_offset + + (int128_nz(mr->size) ? + (hwaddr)int128_get64(int128_sub(mr->size, + int128_one())) : 0), + mr->enabled ? "" : " [disabled]"); + } else { + mon_printf(f, + TARGET_FMT_plx "-" TARGET_FMT_plx " (prio %d, %c%c): %s%s\n", + base + mr->addr, + base + mr->addr + + (int128_nz(mr->size) ? + (hwaddr)int128_get64(int128_sub(mr->size, + int128_one())) : 0), + mr->priority, + mr->romd_mode ? 'R' : '-', + !mr->readonly && !(mr->rom_device && mr->romd_mode) ? 'W' + : '-', + memory_region_name(mr), + mr->enabled ? "" : " [disabled]"); + } + + QTAILQ_INIT(&submr_print_queue); + + QTAILQ_FOREACH(submr, &mr->subregions, subregions_link) { + new_ml = g_new(MemoryRegionList, 1); + new_ml->mr = submr; + QTAILQ_FOREACH(ml, &submr_print_queue, queue) { + if (new_ml->mr->addr < ml->mr->addr || + (new_ml->mr->addr == ml->mr->addr && + new_ml->mr->priority > ml->mr->priority)) { + QTAILQ_INSERT_BEFORE(ml, new_ml, queue); + new_ml = NULL; + break; + } + } + if (new_ml) { + QTAILQ_INSERT_TAIL(&submr_print_queue, new_ml, queue); + } + } + + QTAILQ_FOREACH(ml, &submr_print_queue, queue) { + mtree_print_mr(mon_printf, f, ml->mr, level + 1, base + mr->addr, + alias_print_queue); + } + + QTAILQ_FOREACH_SAFE(ml, &submr_print_queue, queue, next_ml) { + g_free(ml); + } +} + +void mtree_info(fprintf_function mon_printf, void *f) +{ + MemoryRegionListHead ml_head; + MemoryRegionList *ml, *ml2; + AddressSpace *as; + + QTAILQ_INIT(&ml_head); + + QTAILQ_FOREACH(as, &address_spaces, address_spaces_link) { + mon_printf(f, "address-space: %s\n", as->name); + mtree_print_mr(mon_printf, f, as->root, 1, 0, &ml_head); + mon_printf(f, "\n"); + } + + /* print aliased regions */ + QTAILQ_FOREACH(ml, &ml_head, queue) { + mon_printf(f, "memory-region: %s\n", memory_region_name(ml->mr)); + mtree_print_mr(mon_printf, f, ml->mr, 1, 0, &ml_head); + mon_printf(f, "\n"); + } + + QTAILQ_FOREACH_SAFE(ml, &ml_head, queue, ml2) { + g_free(ml); + } +} + +static const TypeInfo memory_region_info = { + .parent = TYPE_OBJECT, + .name = TYPE_MEMORY_REGION, + .instance_size = sizeof(MemoryRegion), + .instance_init = memory_region_initfn, + .instance_finalize = memory_region_finalize, +}; + +static void memory_register_types(void) +{ + type_register_static(&memory_region_info); +} + +type_init(memory_register_types) -- cgit v1.2.3