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memory: Define API for MemoryRegionOps to take attrs and return status

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Define an API so that devices can register MemoryRegionOps whose read
and write callback functions are passed an arbitrary pointer to some
transaction attributes and can return a success-or-failure status code.
This will allow us to model devices which:
 * behave differently for ARM Secure/NonSecure memory accesses
 * behave differently for privileged/unprivileged accesses
 * may return a transaction failure (causing a guest exception)
   for erroneous accesses

This patch defines the new API and plumbs the attributes parameter through
to the memory.c public level functions io_mem_read() and io_mem_write(),
where it is currently dummied out.

The success/failure response indication is also propagated out to
io_mem_read() and io_mem_write(), which retain the old-style
boolean true-for-error return.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Acked-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
This commit is contained in:
Peter Maydell 2015-04-26 16:49:23 +01:00
parent e1a5476354
commit cc05c43ad9
3 changed files with 204 additions and 68 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

41
include/exec/memattrs.h Normal file
View file

@ -0,0 +1,41 @@
/*
* Memory transaction attributes
*
* Copyright (c) 2015 Linaro Limited.
*
* Authors:
* Peter Maydell <peter.maydell@linaro.org>
*
* This work is licensed under the terms of the GNU GPL, version 2 or later.
* See the COPYING file in the top-level directory.
*
*/
#ifndef MEMATTRS_H
#define MEMATTRS_H
/* Every memory transaction has associated with it a set of
* attributes. Some of these are generic (such as the ID of
* the bus master); some are specific to a particular kind of
* bus (such as the ARM Secure/NonSecure bit). We define them
* all as non-overlapping bitfields in a single struct to avoid
* confusion if different parts of QEMU used the same bit for
* different semantics.
*/
typedef struct MemTxAttrs {
/* Bus masters which don't specify any attributes will get this
* (via the MEMTXATTRS_UNSPECIFIED constant), so that we can
* distinguish "all attributes deliberately clear" from
* "didn't specify" if necessary.
*/
unsigned int unspecified:1;
} MemTxAttrs;
/* Bus masters which don't specify any attributes will get this,
* which has all attribute bits clear except the topmost one
* (so that we can distinguish "all attributes deliberately clear"
* from "didn't specify" if necessary).
*/
#define MEMTXATTRS_UNSPECIFIED ((MemTxAttrs) { .unspecified = 1 })
#endif

22
include/exec/memory.h
View file

@ -28,6 +28,7 @@
#ifndef CONFIG_USER_ONLY
#include "exec/hwaddr.h"
#endif
#include "exec/memattrs.h"
#include "qemu/queue.h"
#include "qemu/int128.h"
#include "qemu/notify.h"
@ -68,6 +69,16 @@ struct IOMMUTLBEntry {
IOMMUAccessFlags perm;
};
/* New-style MMIO accessors can indicate that the transaction failed.
* A zero (MEMTX_OK) response means success; anything else is a failure
* of some kind. The memory subsystem will bitwise-OR together results
* if it is synthesizing an operation from multiple smaller accesses.
*/
#define MEMTX_OK 0
#define MEMTX_ERROR (1U << 0) /* device returned an error */
#define MEMTX_DECODE_ERROR (1U << 1) /* nothing at that address */
typedef uint32_t MemTxResult;
/*
* Memory region callbacks
*/
@ -84,6 +95,17 @@ struct MemoryRegionOps {
uint64_t data,
unsigned size);
MemTxResult (*read_with_attrs)(void *opaque,
hwaddr addr,
uint64_t *data,
unsigned size,
MemTxAttrs attrs);
MemTxResult (*write_with_attrs)(void *opaque,
hwaddr addr,
uint64_t data,
unsigned size,
MemTxAttrs attrs);
enum device_endian endianness;
/* Guest-visible constraints: */
struct {

209
memory.c
View file

@ -368,26 +368,29 @@ static void adjust_endianness(MemoryRegion *mr, uint64_t *data, unsigned size)
}
}
static void memory_region_oldmmio_read_accessor(MemoryRegion *mr,
hwaddr addr,
uint64_t *value,
unsigned size,
unsigned shift,
uint64_t mask)
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 void memory_region_read_accessor(MemoryRegion *mr,
hwaddr addr,
uint64_t *value,
unsigned size,
unsigned shift,
uint64_t mask)
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;
@ -397,28 +400,52 @@ static void memory_region_read_accessor(MemoryRegion *mr,
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 void memory_region_oldmmio_write_accessor(MemoryRegion *mr,
hwaddr addr,
uint64_t *value,
unsigned size,
unsigned shift,
uint64_t mask)
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;
if (mr->flush_coalesced_mmio) {
qemu_flush_coalesced_mmio_buffer();
}
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 void memory_region_write_accessor(MemoryRegion *mr,
hwaddr addr,
uint64_t *value,
unsigned size,
unsigned shift,
uint64_t mask)
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;
@ -428,24 +455,46 @@ static void memory_region_write_accessor(MemoryRegion *mr,
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 void access_with_adjusted_size(hwaddr addr,
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;
if (mr->flush_coalesced_mmio) {
qemu_flush_coalesced_mmio_buffer();
}
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,
void (*access)(MemoryRegion *mr,
hwaddr addr,
uint64_t *value,
unsigned size,
unsigned shift,
uint64_t mask),
MemoryRegion *mr)
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;
@ -459,14 +508,16 @@ static void access_with_adjusted_size(hwaddr addr,
access_mask = -1ULL >> (64 - access_size * 8);
if (memory_region_big_endian(mr)) {
for (i = 0; i < size; i += access_size) {
access(mr, addr + i, value, access_size,
(size - access_size - i) * 8, access_mask);
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) {
access(mr, addr + i, value, access_size, i * 8, access_mask);
r |= access(mr, addr + i, value, access_size, i * 8,
access_mask, attrs);
}
}
return r;
}
static AddressSpace *memory_region_to_address_space(MemoryRegion *mr)
@ -1053,62 +1104,82 @@ bool memory_region_access_valid(MemoryRegion *mr,
return true;
}
static uint64_t memory_region_dispatch_read1(MemoryRegion *mr,
hwaddr addr,
unsigned size)
static MemTxResult memory_region_dispatch_read1(MemoryRegion *mr,
hwaddr addr,
uint64_t *pval,
unsigned size,
MemTxAttrs attrs)
{
uint64_t data = 0;
*pval = 0;
if (mr->ops->read) {
access_with_adjusted_size(addr, &data, size,
mr->ops->impl.min_access_size,
mr->ops->impl.max_access_size,
memory_region_read_accessor, mr);
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 {
access_with_adjusted_size(addr, &data, size, 1, 4,
memory_region_oldmmio_read_accessor, mr);
return access_with_adjusted_size(addr, pval, size, 1, 4,
memory_region_oldmmio_read_accessor,
mr, attrs);
}
return data;
}
static bool memory_region_dispatch_read(MemoryRegion *mr,
hwaddr addr,
uint64_t *pval,
unsigned size)
static 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 true;
return MEMTX_DECODE_ERROR;
}
*pval = memory_region_dispatch_read1(mr, addr, size);
r = memory_region_dispatch_read1(mr, addr, pval, size, attrs);
adjust_endianness(mr, pval, size);
return false;
return r;
}
static bool memory_region_dispatch_write(MemoryRegion *mr,
hwaddr addr,
uint64_t data,
unsigned size)
static 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 true;
return MEMTX_DECODE_ERROR;
}
adjust_endianness(mr, &data, size);
if (mr->ops->write) {
access_with_adjusted_size(addr, &data, size,
mr->ops->impl.min_access_size,
mr->ops->impl.max_access_size,
memory_region_write_accessor, mr);
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 {
access_with_adjusted_size(addr, &data, size, 1, 4,
memory_region_oldmmio_write_accessor, mr);
return access_with_adjusted_size(addr, &data, size, 1, 4,
memory_region_oldmmio_write_accessor,
mr, attrs);
}
return false;
}
void memory_region_init_io(MemoryRegion *mr,
@ -1994,13 +2065,15 @@ void address_space_destroy(AddressSpace *as)
bool io_mem_read(MemoryRegion *mr, hwaddr addr, uint64_t *pval, unsigned size)
{
return memory_region_dispatch_read(mr, addr, pval, size);
return memory_region_dispatch_read(mr, addr, pval, size,
MEMTXATTRS_UNSPECIFIED);
}
bool io_mem_write(MemoryRegion *mr, hwaddr addr,
uint64_t val, unsigned size)
{
return memory_region_dispatch_write(mr, addr, val, size);
return memory_region_dispatch_write(mr, addr, val, size,
MEMTXATTRS_UNSPECIFIED);
}
typedef struct MemoryRegionList MemoryRegionList;