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accel/tcg: Merge io_readx into do_ld_mmio_beN

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Avoid multiple calls to io_prepare for unaligned acceses.
One call to do_ld_mmio_beN will never cross pages.

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Richard Henderson 2023-08-27 09:50:41 -07:00
parent d89c64f6fd
commit 13e617475d
1 changed files with 30 additions and 54 deletions
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84
accel/tcg/cputlb.c
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@ -1388,32 +1388,6 @@ static void io_failed(CPUArchState *env, CPUTLBEntryFull *full, vaddr addr,
}
}
static uint64_t io_readx(CPUArchState *env, CPUTLBEntryFull *full,
int mmu_idx, vaddr addr, uintptr_t retaddr,
MMUAccessType access_type, MemOp op)
{
MemoryRegionSection *section;
hwaddr mr_offset;
MemoryRegion *mr;
MemTxResult r;
uint64_t val;
section = io_prepare(&mr_offset, env, full->xlat_section,
full->attrs, addr, retaddr);
mr = section->mr;
{
QEMU_IOTHREAD_LOCK_GUARD();
r = memory_region_dispatch_read(mr, mr_offset, &val, op, full->attrs);
}
if (r != MEMTX_OK) {
io_failed(env, full, addr, memop_size(op), access_type, mmu_idx,
r, retaddr);
}
return val;
}
static void io_writex(CPUArchState *env, CPUTLBEntryFull *full,
int mmu_idx, uint64_t val, vaddr addr,
uintptr_t retaddr, MemOp op)
@ -2062,40 +2036,42 @@ static uint64_t do_ld_mmio_beN(CPUArchState *env, CPUTLBEntryFull *full,
uint64_t ret_be, vaddr addr, int size,
int mmu_idx, MMUAccessType type, uintptr_t ra)
{
uint64_t t;
MemoryRegionSection *section;
hwaddr mr_offset;
MemoryRegion *mr;
MemTxAttrs attrs;
tcg_debug_assert(size > 0 && size <= 8);
attrs = full->attrs;
section = io_prepare(&mr_offset, env, full->xlat_section, attrs, addr, ra);
mr = section->mr;
do {
MemOp this_mop;
unsigned this_size;
uint64_t val;
MemTxResult r;
/* Read aligned pieces up to 8 bytes. */
switch ((size | (int)addr) & 7) {
case 1:
case 3:
case 5:
case 7:
t = io_readx(env, full, mmu_idx, addr, ra, type, MO_UB);
ret_be = (ret_be << 8) | t;
size -= 1;
addr += 1;
break;
case 2:
case 6:
t = io_readx(env, full, mmu_idx, addr, ra, type, MO_BEUW);
ret_be = (ret_be << 16) | t;
size -= 2;
addr += 2;
break;
case 4:
t = io_readx(env, full, mmu_idx, addr, ra, type, MO_BEUL);
ret_be = (ret_be << 32) | t;
size -= 4;
addr += 4;
break;
case 0:
return io_readx(env, full, mmu_idx, addr, ra, type, MO_BEUQ);
default:
qemu_build_not_reached();
this_mop = ctz32(size | (int)addr | 8);
this_size = 1 << this_mop;
this_mop |= MO_BE;
r = memory_region_dispatch_read(mr, mr_offset, &val, this_mop, attrs);
if (unlikely(r != MEMTX_OK)) {
io_failed(env, full, addr, this_size, type, mmu_idx, r, ra);
}
if (this_size == 8) {
return val;
}
ret_be = (ret_be << (this_size * 8)) | val;
addr += this_size;
mr_offset += this_size;
size -= this_size;
} while (size);
return ret_be;
}