util: Extract flush_icache_range to cacheflush.c

This has been a tcg-specific function, but is also in use
by hardware accelerators via physmem.c.  This can cause
link errors when tcg is disabled.

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Joelle van Dyne <j@getutm.app>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Message-Id: <20201214140314.18544-3-richard.henderson@linaro.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

MAINTAINERS

@@ -119,6 +119,8 @@ F: softmmu/cpus.c
 F: cpus-common.c
 F: accel/tcg/
 F: accel/stubs/tcg-stub.c
+F: util/cacheinfo.c
+F: util/cacheflush.c
 F: scripts/decodetree.py
 F: docs/devel/decodetree.rst
 F: include/exec/cpu*.h

include/qemu/cacheflush.h

@@ -0,0 +1,24 @@
+/*
+ * Flush the host cpu caches.
+ *
+ * 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 QEMU_CACHEFLUSH_H
+#define QEMU_CACHEFLUSH_H
+
+#if defined(__i386__) || defined(__x86_64__) || defined(__s390__)
+
+static inline void flush_icache_range(uintptr_t start, uintptr_t stop)
+{
+    /* icache is coherent and does not require flushing. */
+}
+
+#else
+
+void flush_icache_range(uintptr_t start, uintptr_t stop);
+
+#endif
+
+#endif /* QEMU_CACHEFLUSH_H */

softmmu/physmem.c

@@ -22,6 +22,7 @@
 #include "qapi/error.h"
 
 #include "qemu/cutils.h"
+#include "qemu/cacheflush.h"
 #include "cpu.h"
 #include "exec/exec-all.h"
 #include "exec/target_page.h"

tcg/aarch64/tcg-target.h

@@ -148,11 +148,6 @@ typedef enum {
 #define TCG_TARGET_DEFAULT_MO (0)
 #define TCG_TARGET_HAS_MEMORY_BSWAP     1
 
-static inline void flush_icache_range(uintptr_t start, uintptr_t stop)
-{
-    __builtin___clear_cache((char *)start, (char *)stop);
-}
-
 void tb_target_set_jmp_target(uintptr_t, uintptr_t, uintptr_t);
 
 #ifdef CONFIG_SOFTMMU

tcg/arm/tcg-target.h

@@ -134,11 +134,6 @@ enum {
 #define TCG_TARGET_DEFAULT_MO (0)
 #define TCG_TARGET_HAS_MEMORY_BSWAP     1
 
-static inline void flush_icache_range(uintptr_t start, uintptr_t stop)
-{
-    __builtin___clear_cache((char *) start, (char *) stop);
-}
-
 /* not defined -- call should be eliminated at compile time */
 void tb_target_set_jmp_target(uintptr_t, uintptr_t, uintptr_t);
 

tcg/i386/tcg-target.h

@@ -206,10 +206,6 @@ extern bool have_avx2;
 #define TCG_TARGET_extract_i64_valid(ofs, len) \
     (((ofs) == 8 && (len) == 8) || ((ofs) + (len)) == 32)
 
-static inline void flush_icache_range(uintptr_t start, uintptr_t stop)
-{
-}
-
 static inline void tb_target_set_jmp_target(uintptr_t tc_ptr,
                                             uintptr_t jmp_addr, uintptr_t addr)
 {

tcg/mips/tcg-target.h

@@ -198,20 +198,9 @@ extern bool use_mips32r2_instructions;
 #define TCG_TARGET_HAS_ext16u_i64       0 /* andi rt, rs, 0xffff */
 #endif
 
-#ifdef __OpenBSD__
-#include <machine/sysarch.h>
-#else
-#include <sys/cachectl.h>
-#endif
-
 #define TCG_TARGET_DEFAULT_MO (0)
 #define TCG_TARGET_HAS_MEMORY_BSWAP     1
 
-static inline void flush_icache_range(uintptr_t start, uintptr_t stop)
-{
-    cacheflush ((void *)start, stop-start, ICACHE);
-}
-
 void tb_target_set_jmp_target(uintptr_t, uintptr_t, uintptr_t);
 
 #ifdef CONFIG_SOFTMMU

tcg/ppc/tcg-target.c.inc

@@ -3863,25 +3863,3 @@ void tcg_register_jit(void *buf, size_t buf_size)
     tcg_register_jit_int(buf, buf_size, &debug_frame, sizeof(debug_frame));
 }
 #endif /* __ELF__ */
-
-void flush_icache_range(uintptr_t start, uintptr_t stop)
-{
-    uintptr_t p, start1, stop1;
-    size_t dsize = qemu_dcache_linesize;
-    size_t isize = qemu_icache_linesize;
-
-    start1 = start & ~(dsize - 1);
-    stop1 = (stop + dsize - 1) & ~(dsize - 1);
-    for (p = start1; p < stop1; p += dsize) {
-        asm volatile ("dcbst 0,%0" : : "r"(p) : "memory");
-    }
-    asm volatile ("sync" : : : "memory");
-
-    start &= start & ~(isize - 1);
-    stop1 = (stop + isize - 1) & ~(isize - 1);
-    for (p = start1; p < stop1; p += isize) {
-        asm volatile ("icbi 0,%0" : : "r"(p) : "memory");
-    }
-    asm volatile ("sync" : : : "memory");
-    asm volatile ("isync" : : : "memory");
-}

tcg/ppc/tcg-target.h

@@ -175,7 +175,6 @@ extern bool have_vsx;
 #define TCG_TARGET_HAS_bitsel_vec       have_vsx
 #define TCG_TARGET_HAS_cmpsel_vec       0
 
-void flush_icache_range(uintptr_t start, uintptr_t stop);
 void tb_target_set_jmp_target(uintptr_t, uintptr_t, uintptr_t);
 
 #define TCG_TARGET_DEFAULT_MO (0)

tcg/riscv/tcg-target.h

@@ -159,11 +159,6 @@ typedef enum {
 #define TCG_TARGET_HAS_mulsh_i64        1
 #endif
 
-static inline void flush_icache_range(uintptr_t start, uintptr_t stop)
-{
-    __builtin___clear_cache((char *)start, (char *)stop);
-}
-
 /* not defined -- call should be eliminated at compile time */
 void tb_target_set_jmp_target(uintptr_t, uintptr_t, uintptr_t);
 

tcg/s390/tcg-target.h

@@ -145,10 +145,6 @@ enum {
     TCG_AREG0 = TCG_REG_R10,
 };
 
-static inline void flush_icache_range(uintptr_t start, uintptr_t stop)
-{
-}
-
 static inline void tb_target_set_jmp_target(uintptr_t tc_ptr,
                                             uintptr_t jmp_addr, uintptr_t addr)
 {

tcg/sparc/tcg-target.h

@@ -168,14 +168,6 @@ extern bool use_vis3_instructions;
 #define TCG_TARGET_DEFAULT_MO (0)
 #define TCG_TARGET_HAS_MEMORY_BSWAP     1
 
-static inline void flush_icache_range(uintptr_t start, uintptr_t stop)
-{
-    uintptr_t p;
-    for (p = start & -8; p < ((stop + 7) & -8); p += 8) {
-        __asm__ __volatile__("flush\t%0" : : "r" (p));
-    }
-}
-
 void tb_target_set_jmp_target(uintptr_t, uintptr_t, uintptr_t);
 
 #define TCG_TARGET_NEED_POOL_LABELS

tcg/tcg.c

@@ -35,6 +35,7 @@
 #include "qemu/host-utils.h"
 #include "qemu/qemu-print.h"
 #include "qemu/timer.h"
+#include "qemu/cacheflush.h"
 
 /* Note: the long term plan is to reduce the dependencies on the QEMU
    CPU definitions. Currently they are used for qemu_ld/st

tcg/tci/tcg-target.h

@@ -191,10 +191,6 @@ void tci_disas(uint8_t opc);
 
 #define HAVE_TCG_QEMU_TB_EXEC
 
-static inline void flush_icache_range(uintptr_t start, uintptr_t stop)
-{
-}
-
 /* We could notice __i386__ or __s390x__ and reduce the barriers depending
    on the host.  But if you want performance, you use the normal backend.
    We prefer consistency across hosts on this.  */

util/cacheflush.c

@@ -0,0 +1,71 @@
+/*
+ * Flush the host cpu caches.
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or later.
+ * See the COPYING file in the top-level directory.
+ */
+
+#include "qemu/osdep.h"
+#include "qemu/cacheflush.h"
+
+
+#if defined(__i386__) || defined(__x86_64__) || defined(__s390__)
+
+/* Caches are coherent and do not require flushing; symbol inline. */
+
+#elif defined(__mips__)
+
+#ifdef __OpenBSD__
+#include <machine/sysarch.h>
+#else
+#include <sys/cachectl.h>
+#endif
+
+void flush_icache_range(uintptr_t start, uintptr_t stop)
+{
+    cacheflush((void *)start, stop - start, ICACHE);
+}
+
+#elif defined(__powerpc__)
+
+void flush_icache_range(uintptr_t start, uintptr_t stop)
+{
+    uintptr_t p, start1, stop1;
+    size_t dsize = qemu_dcache_linesize;
+    size_t isize = qemu_icache_linesize;
+
+    start1 = start & ~(dsize - 1);
+    stop1 = (stop + dsize - 1) & ~(dsize - 1);
+    for (p = start1; p < stop1; p += dsize) {
+        asm volatile ("dcbst 0,%0" : : "r"(p) : "memory");
+    }
+    asm volatile ("sync" : : : "memory");
+
+    start &= start & ~(isize - 1);
+    stop1 = (stop + isize - 1) & ~(isize - 1);
+    for (p = start1; p < stop1; p += isize) {
+        asm volatile ("icbi 0,%0" : : "r"(p) : "memory");
+    }
+    asm volatile ("sync" : : : "memory");
+    asm volatile ("isync" : : : "memory");
+}
+
+#elif defined(__sparc__)
+
+void flush_icache_range(uintptr_t start, uintptr_t stop)
+{
+    uintptr_t p;
+
+    for (p = start & -8; p < ((stop + 7) & -8); p += 8) {
+        __asm__ __volatile__("flush\t%0" : : "r" (p));
+    }
+}
+
+#else
+
+void flush_icache_range(uintptr_t start, uintptr_t stop)
+{
+    __builtin___clear_cache((char *)start, (char *)stop);
+}
+
+#endif

util/meson.build

@@ -21,7 +21,7 @@ util_ss.add(files('envlist.c', 'path.c', 'module.c'))
 util_ss.add(files('host-utils.c'))
 util_ss.add(files('bitmap.c', 'bitops.c'))
 util_ss.add(files('fifo8.c'))
-util_ss.add(files('cacheinfo.c'))
+util_ss.add(files('cacheinfo.c', 'cacheflush.c'))
 util_ss.add(files('error.c', 'qemu-error.c'))
 util_ss.add(files('qemu-print.c'))
 util_ss.add(files('id.c'))