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-rw-r--r--include/exec/cpu-common.h4
-rw-r--r--include/exec/memory.h36
-rw-r--r--include/exec/ram_addr.h3
-rw-r--r--include/hw/cris/etraxfs.h16
-rw-r--r--include/qemu/atomic.h25
5 files changed, 74 insertions, 10 deletions
diff --git a/include/exec/cpu-common.h b/include/exec/cpu-common.h
index a2c3b92742..aaee995634 100644
--- a/include/exec/cpu-common.h
+++ b/include/exec/cpu-common.h
@@ -57,10 +57,10 @@ typedef uint32_t CPUReadMemoryFunc(void *opaque, hwaddr addr);
void qemu_ram_remap(ram_addr_t addr, ram_addr_t length);
/* This should not be used by devices. */
-MemoryRegion *qemu_ram_addr_from_host(void *ptr, ram_addr_t *ram_addr);
+ram_addr_t qemu_ram_addr_from_host(void *ptr);
RAMBlock *qemu_ram_block_by_name(const char *name);
RAMBlock *qemu_ram_block_from_host(void *ptr, bool round_offset,
- ram_addr_t *ram_addr, ram_addr_t *offset);
+ ram_addr_t *offset);
void qemu_ram_set_idstr(RAMBlock *block, const char *name, DeviceState *dev);
void qemu_ram_unset_idstr(RAMBlock *block);
const char *qemu_ram_get_idstr(RAMBlock *rb);
diff --git a/include/exec/memory.h b/include/exec/memory.h
index f649697ee9..4ab680052f 100644
--- a/include/exec/memory.h
+++ b/include/exec/memory.h
@@ -32,6 +32,8 @@
#include "qom/object.h"
#include "qemu/rcu.h"
+#define RAM_ADDR_INVALID (~(ram_addr_t)0)
+
#define MAX_PHYS_ADDR_SPACE_BITS 62
#define MAX_PHYS_ADDR (((hwaddr)1 << MAX_PHYS_ADDR_SPACE_BITS) - 1)
@@ -667,6 +669,35 @@ static inline bool memory_region_is_rom(MemoryRegion *mr)
int memory_region_get_fd(MemoryRegion *mr);
/**
+ * memory_region_set_fd: Mark a RAM memory region as backed by a
+ * file descriptor.
+ *
+ * This function is typically used after memory_region_init_ram_ptr().
+ *
+ * @mr: the memory region being queried.
+ * @fd: the file descriptor that backs @mr.
+ */
+void memory_region_set_fd(MemoryRegion *mr, int fd);
+
+/**
+ * memory_region_from_host: Convert a pointer into a RAM memory region
+ * and an offset within it.
+ *
+ * Given a host pointer inside a RAM memory region (created with
+ * memory_region_init_ram() or memory_region_init_ram_ptr()), return
+ * the MemoryRegion and the offset within it.
+ *
+ * Use with care; by the time this function returns, the returned pointer is
+ * not protected by RCU anymore. If the caller is not within an RCU critical
+ * section and does not hold the iothread lock, it must have other means of
+ * protecting the pointer, such as a reference to the region that includes
+ * the incoming ram_addr_t.
+ *
+ * @mr: the memory region being queried.
+ */
+MemoryRegion *memory_region_from_host(void *ptr, ram_addr_t *offset);
+
+/**
* memory_region_get_ram_ptr: Get a pointer into a RAM memory region.
*
* Returns a host pointer to a RAM memory region (created with
@@ -1362,7 +1393,7 @@ MemTxResult address_space_read_continue(AddressSpace *as, hwaddr addr,
MemoryRegion *mr);
MemTxResult address_space_read_full(AddressSpace *as, hwaddr addr,
MemTxAttrs attrs, uint8_t *buf, int len);
-void *qemu_get_ram_ptr(RAMBlock *ram_block, ram_addr_t addr);
+void *qemu_map_ram_ptr(RAMBlock *ram_block, ram_addr_t addr);
static inline bool memory_access_is_direct(MemoryRegion *mr, bool is_write)
{
@@ -1400,8 +1431,7 @@ MemTxResult address_space_read(AddressSpace *as, hwaddr addr, MemTxAttrs attrs,
l = len;
mr = address_space_translate(as, addr, &addr1, &l, false);
if (len == l && memory_access_is_direct(mr, false)) {
- addr1 += memory_region_get_ram_addr(mr);
- ptr = qemu_get_ram_ptr(mr->ram_block, addr1);
+ ptr = qemu_map_ram_ptr(mr->ram_block, addr1);
memcpy(buf, ptr, len);
} else {
result = address_space_read_continue(as, addr, attrs, buf, len,
diff --git a/include/exec/ram_addr.h b/include/exec/ram_addr.h
index 5b6e1b8b86..2a9465da11 100644
--- a/include/exec/ram_addr.h
+++ b/include/exec/ram_addr.h
@@ -105,9 +105,6 @@ RAMBlock *qemu_ram_alloc_resizeable(ram_addr_t size, ram_addr_t max_size,
uint64_t length,
void *host),
MemoryRegion *mr, Error **errp);
-int qemu_get_ram_fd(ram_addr_t addr);
-void qemu_set_ram_fd(ram_addr_t addr, int fd);
-void *qemu_get_ram_block_host_ptr(ram_addr_t addr);
void qemu_ram_free(RAMBlock *block);
int qemu_ram_resize(RAMBlock *block, ram_addr_t newsize, Error **errp);
diff --git a/include/hw/cris/etraxfs.h b/include/hw/cris/etraxfs.h
index 73a6134c1e..eb664181e7 100644
--- a/include/hw/cris/etraxfs.h
+++ b/include/hw/cris/etraxfs.h
@@ -46,4 +46,20 @@ etraxfs_eth_init(NICInfo *nd, hwaddr base, int phyaddr,
return dev;
}
+static inline DeviceState *etraxfs_ser_create(hwaddr addr,
+ qemu_irq irq,
+ CharDriverState *chr)
+{
+ DeviceState *dev;
+ SysBusDevice *s;
+
+ dev = qdev_create(NULL, "etraxfs,serial");
+ s = SYS_BUS_DEVICE(dev);
+ qdev_prop_set_chr(dev, "chardev", chr);
+ qdev_init_nofail(dev);
+ sysbus_mmio_map(s, 0, addr);
+ sysbus_connect_irq(s, 0, irq);
+ return dev;
+}
+
#endif
diff --git a/include/qemu/atomic.h b/include/qemu/atomic.h
index 5bc4d6cc47..7a590969b5 100644
--- a/include/qemu/atomic.h
+++ b/include/qemu/atomic.h
@@ -36,7 +36,18 @@
#define smp_wmb() ({ barrier(); __atomic_thread_fence(__ATOMIC_RELEASE); barrier(); })
#define smp_rmb() ({ barrier(); __atomic_thread_fence(__ATOMIC_ACQUIRE); barrier(); })
+/* Most compilers currently treat consume and acquire the same, but really
+ * no processors except Alpha need a barrier here. Leave it in if
+ * using Thread Sanitizer to avoid warnings, otherwise optimize it away.
+ */
+#if defined(__SANITIZE_THREAD__)
#define smp_read_barrier_depends() ({ barrier(); __atomic_thread_fence(__ATOMIC_CONSUME); barrier(); })
+#elsif defined(__alpha__)
+#define smp_read_barrier_depends() asm volatile("mb":::"memory")
+#else
+#define smp_read_barrier_depends() barrier()
+#endif
+
/* Weak atomic operations prevent the compiler moving other
* loads/stores past the atomic operation load/store. However there is
@@ -56,13 +67,23 @@
__atomic_store(ptr, &_val, __ATOMIC_RELAXED); \
} while(0)
-/* Atomic RCU operations imply weak memory barriers */
+/* See above: most compilers currently treat consume and acquire the
+ * same, but this slows down atomic_rcu_read unnecessarily.
+ */
+#ifdef __SANITIZE_THREAD__
+#define atomic_rcu_read__nocheck(ptr, valptr) \
+ __atomic_load(ptr, valptr, __ATOMIC_CONSUME);
+#else
+#define atomic_rcu_read__nocheck(ptr, valptr) \
+ __atomic_load(ptr, valptr, __ATOMIC_RELAXED); \
+ smp_read_barrier_depends();
+#endif
#define atomic_rcu_read(ptr) \
({ \
QEMU_BUILD_BUG_ON(sizeof(*ptr) > sizeof(void *)); \
typeof(*ptr) _val; \
- __atomic_load(ptr, &_val, __ATOMIC_CONSUME); \
+ atomic_rcu_read__nocheck(ptr, &_val); \
_val; \
})
generated by cgit v1.2.3 (git 2.26.2) at 2025-02-06 05:53:21 +0000