dma: eliminate DMAContext

The DMAContext is a simple pointer to an AddressSpace that is now always
already available.  Make everyone hold the address space directly,
and clean up the DMA API to use the AddressSpace directly.

Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

1 files changed, 32 insertions, 43 deletions

diff --git a/include/sysemu/dma.h b/include/sysemu/dma.h
index 3317dcf..031d1f5 100644
--- a/include/sysemu/dma.h
+++ b/include/sysemu/dma.h
@@ -12,11 +12,11 @@
 
 #include <stdio.h>
 #include "exec/memory.h"
+#include "exec/address-spaces.h"
 #include "hw/hw.h"
 #include "block/block.h"
 #include "sysemu/kvm.h"
 
-typedef struct DMAContext DMAContext;
 typedef struct ScatterGatherEntry ScatterGatherEntry;
 
 typedef enum {
@@ -29,7 +29,7 @@ struct QEMUSGList {
     int nsg;
     int nalloc;
     size_t size;
-    DMAContext *dma;
+    AddressSpace *as;
 };
 
 #ifndef CONFIG_USER_ONLY
@@ -46,16 +46,7 @@ typedef uint64_t dma_addr_t;
 #define DMA_ADDR_BITS 64
 #define DMA_ADDR_FMT "%" PRIx64
 
-struct DMAContext {
-    AddressSpace *as;
-};
-
-/* A global DMA context corresponding to the address_space_memory
- * AddressSpace, for sysbus devices which do DMA.
- */
-extern DMAContext dma_context_memory;
-
-static inline void dma_barrier(DMAContext *dma, DMADirection dir)
+static inline void dma_barrier(AddressSpace *as, DMADirection dir)
 {
     /*
      * This is called before DMA read and write operations
@@ -83,105 +74,105 @@ static inline void dma_barrier(DMAContext *dma, DMADirection dir)
 /* Checks that the given range of addresses is valid for DMA.  This is
  * useful for certain cases, but usually you should just use
  * dma_memory_{read,write}() and check for errors */
-static inline bool dma_memory_valid(DMAContext *dma,
+static inline bool dma_memory_valid(AddressSpace *as,
                                     dma_addr_t addr, dma_addr_t len,
                                     DMADirection dir)
 {
-    return address_space_access_valid(dma->as, addr, len,
+    return address_space_access_valid(as, addr, len,
                                       dir == DMA_DIRECTION_FROM_DEVICE);
 }
 
-static inline int dma_memory_rw_relaxed(DMAContext *dma, dma_addr_t addr,
+static inline int dma_memory_rw_relaxed(AddressSpace *as, dma_addr_t addr,
                                         void *buf, dma_addr_t len,
                                         DMADirection dir)
 {
-    return address_space_rw(dma->as, addr, buf, len, dir == DMA_DIRECTION_FROM_DEVICE);
+    return address_space_rw(as, addr, buf, len, dir == DMA_DIRECTION_FROM_DEVICE);
 }
 
-static inline int dma_memory_read_relaxed(DMAContext *dma, dma_addr_t addr,
+static inline int dma_memory_read_relaxed(AddressSpace *as, dma_addr_t addr,
                                           void *buf, dma_addr_t len)
 {
-    return dma_memory_rw_relaxed(dma, addr, buf, len, DMA_DIRECTION_TO_DEVICE);
+    return dma_memory_rw_relaxed(as, addr, buf, len, DMA_DIRECTION_TO_DEVICE);
 }
 
-static inline int dma_memory_write_relaxed(DMAContext *dma, dma_addr_t addr,
+static inline int dma_memory_write_relaxed(AddressSpace *as, dma_addr_t addr,
                                            const void *buf, dma_addr_t len)
 {
-    return dma_memory_rw_relaxed(dma, addr, (void *)buf, len,
+    return dma_memory_rw_relaxed(as, addr, (void *)buf, len,
                                  DMA_DIRECTION_FROM_DEVICE);
 }
 
-static inline int dma_memory_rw(DMAContext *dma, dma_addr_t addr,
+static inline int dma_memory_rw(AddressSpace *as, dma_addr_t addr,
                                 void *buf, dma_addr_t len,
                                 DMADirection dir)
 {
-    dma_barrier(dma, dir);
+    dma_barrier(as, dir);
 
-    return dma_memory_rw_relaxed(dma, addr, buf, len, dir);
+    return dma_memory_rw_relaxed(as, addr, buf, len, dir);
 }
 
-static inline int dma_memory_read(DMAContext *dma, dma_addr_t addr,
+static inline int dma_memory_read(AddressSpace *as, dma_addr_t addr,
                                   void *buf, dma_addr_t len)
 {
-    return dma_memory_rw(dma, addr, buf, len, DMA_DIRECTION_TO_DEVICE);
+    return dma_memory_rw(as, addr, buf, len, DMA_DIRECTION_TO_DEVICE);
 }
 
-static inline int dma_memory_write(DMAContext *dma, dma_addr_t addr,
+static inline int dma_memory_write(AddressSpace *as, dma_addr_t addr,
                                    const void *buf, dma_addr_t len)
 {
-    return dma_memory_rw(dma, addr, (void *)buf, len,
+    return dma_memory_rw(as, addr, (void *)buf, len,
                          DMA_DIRECTION_FROM_DEVICE);
 }
 
-int dma_memory_set(DMAContext *dma, dma_addr_t addr, uint8_t c, dma_addr_t len);
+int dma_memory_set(AddressSpace *as, dma_addr_t addr, uint8_t c, dma_addr_t len);
 
-static inline void *dma_memory_map(DMAContext *dma,
+static inline void *dma_memory_map(AddressSpace *as,
                                    dma_addr_t addr, dma_addr_t *len,
                                    DMADirection dir)
 {
     hwaddr xlen = *len;
     void *p;
 
-    p = address_space_map(dma->as, addr, &xlen, dir == DMA_DIRECTION_FROM_DEVICE);
+    p = address_space_map(as, addr, &xlen, dir == DMA_DIRECTION_FROM_DEVICE);
     *len = xlen;
     return p;
 }
 
-static inline void dma_memory_unmap(DMAContext *dma,
+static inline void dma_memory_unmap(AddressSpace *as,
                                     void *buffer, dma_addr_t len,
                                     DMADirection dir, dma_addr_t access_len)
 {
-    address_space_unmap(dma->as, buffer, (hwaddr)len,
+    address_space_unmap(as, buffer, (hwaddr)len,
                         dir == DMA_DIRECTION_FROM_DEVICE, access_len);
 }
 
 #define DEFINE_LDST_DMA(_lname, _sname, _bits, _end) \
-    static inline uint##_bits##_t ld##_lname##_##_end##_dma(DMAContext *dma, \
+    static inline uint##_bits##_t ld##_lname##_##_end##_dma(AddressSpace *as, \
                                                             dma_addr_t addr) \
     {                                                                   \
         uint##_bits##_t val;                                            \
-        dma_memory_read(dma, addr, &val, (_bits) / 8);                  \
+        dma_memory_read(as, addr, &val, (_bits) / 8);                   \
         return _end##_bits##_to_cpu(val);                               \
     }                                                                   \
-    static inline void st##_sname##_##_end##_dma(DMAContext *dma,       \
+    static inline void st##_sname##_##_end##_dma(AddressSpace *as,      \
                                                  dma_addr_t addr,       \
                                                  uint##_bits##_t val)   \
     {                                                                   \
         val = cpu_to_##_end##_bits(val);                                \
-        dma_memory_write(dma, addr, &val, (_bits) / 8);                 \
+        dma_memory_write(as, addr, &val, (_bits) / 8);                  \
     }
 
-static inline uint8_t ldub_dma(DMAContext *dma, dma_addr_t addr)
+static inline uint8_t ldub_dma(AddressSpace *as, dma_addr_t addr)
 {
     uint8_t val;
 
-    dma_memory_read(dma, addr, &val, 1);
+    dma_memory_read(as, addr, &val, 1);
     return val;
 }
 
-static inline void stb_dma(DMAContext *dma, dma_addr_t addr, uint8_t val)
+static inline void stb_dma(AddressSpace *as, dma_addr_t addr, uint8_t val)
 {
-    dma_memory_write(dma, addr, &val, 1);
+    dma_memory_write(as, addr, &val, 1);
 }
 
 DEFINE_LDST_DMA(uw, w, 16, le);
@@ -193,14 +184,12 @@ DEFINE_LDST_DMA(q, q, 64, be);
 
 #undef DEFINE_LDST_DMA
 
-void dma_context_init(DMAContext *dma, AddressSpace *as);
-
 struct ScatterGatherEntry {
     dma_addr_t base;
     dma_addr_t len;
 };
 
-void qemu_sglist_init(QEMUSGList *qsg, int alloc_hint, DMAContext *dma);
+void qemu_sglist_init(QEMUSGList *qsg, int alloc_hint, AddressSpace *as);
 void qemu_sglist_add(QEMUSGList *qsg, dma_addr_t base, dma_addr_t len);
 void qemu_sglist_destroy(QEMUSGList *qsg);
 #endif