Allocating an FDT phandle (a unique identifier) using a static
variable in a static inline function defined in a header file works
only if all users are in the same source file. So trying to allocate
a handle from two different compilation units fails.
Introduce global phandle allocation and reference code to properly
allocate unique phandles.
Signed-off-by: Andre Przywara <andre.przywara@xxxxxxx>
---
Makefile | 1 +
arm/fdt.c | 2 +-
arm/gic.c | 2 +-
include/kvm/fdt.h | 10 +++++-----
kvm-fdt.c | 26 ++++++++++++++++++++++++++
5 files changed, 34 insertions(+), 7 deletions(-)
create mode 100644 kvm-fdt.c
diff --git a/Makefile b/Makefile
index 1f0196f..e4a4002 100644
--- a/Makefile
+++ b/Makefile
@@ -98,6 +98,7 @@ OBJS += kvm-ipc.o
OBJS += builtin-sandbox.o
OBJS += virtio/mmio.o
OBJS += hw/i8042.o
+OBJS += kvm-fdt.o
# Translate uname -m into ARCH string
ARCH ?= $(shell uname -m | sed -e s/i.86/i386/ -e s/ppc.*/powerpc/ \
diff --git a/arm/fdt.c b/arm/fdt.c
index 381d48f..8bcfffb 100644
--- a/arm/fdt.c
+++ b/arm/fdt.c
@@ -114,7 +114,7 @@ static int setup_fdt(struct kvm *kvm)
{
struct device_header *dev_hdr;
u8 staging_fdt[FDT_MAX_SIZE];
- u32 gic_phandle = fdt__alloc_phandle();
+ u32 gic_phandle = fdt__get_phandle(PHANDLE_GIC);
u64 mem_reg_prop[] = {
cpu_to_fdt64(kvm->arch.memory_guest_start),
cpu_to_fdt64(kvm->ram_size),
diff --git a/arm/gic.c b/arm/gic.c
index d6d6dd0..b60437e 100644
--- a/arm/gic.c
+++ b/arm/gic.c
@@ -222,7 +222,7 @@ void gic__generate_fdt_nodes(void *fdt, u32 phandle, enum irqchip_type type)
_FDT(fdt_property_cell(fdt, "#interrupt-cells", GIC_FDT_IRQ_NUM_CELLS));
_FDT(fdt_property(fdt, "interrupt-controller", NULL, 0));
_FDT(fdt_property(fdt, "reg", reg_prop, sizeof(reg_prop)));
- _FDT(fdt_property_cell(fdt, "phandle", phandle));
+ _FDT(fdt_property_cell(fdt, "phandle", fdt__get_phandle(PHANDLE_GIC)));
_FDT(fdt_end_node(fdt));
}
diff --git a/include/kvm/fdt.h b/include/kvm/fdt.h
index 53d85a4..cd2bb72 100644
--- a/include/kvm/fdt.h
+++ b/include/kvm/fdt.h
@@ -8,6 +8,10 @@
#include <linux/types.h>
#define FDT_MAX_SIZE 0x10000
+#define FDT_INVALID_PHANDLE 0
+#define FDT_IS_VALID_PHANDLE(phandle) ((phandle) != FDT_INVALID_PHANDLE)
+
+enum phandles {PHANDLE_GIC, PHANDLES_MAX};
/* Those definitions are generic FDT values for specifying IRQ
* types and are used in the Linux kernel internally as well as in
@@ -33,10 +37,6 @@ enum irq_type {
} \
} while (0)
-static inline u32 fdt__alloc_phandle(void)
-{
- static u32 phandle = 0;
- return ++phandle;
-}
+u32 fdt__get_phandle(enum phandles phandle);
#endif /* KVM__FDT_H */
diff --git a/kvm-fdt.c b/kvm-fdt.c
new file mode 100644
index 0000000..d05f3fe
--- /dev/null
+++ b/kvm-fdt.c
@@ -0,0 +1,26 @@
+/*
+ * Commonly used FDT functions.
+ */
+
+#include <stdio.h>
+#include "kvm/fdt.h"
+#include "kvm/util.h"
+
+u32 phandles[PHANDLES_MAX] = {};
+u32 next_phandle = 1;
+
+u32 fdt__get_phandle(enum phandles phandle)
+{
+ u32 ret;
+
+ if (phandle >= PHANDLES_MAX)
+ return FDT_INVALID_PHANDLE;
+
+ ret = phandles[phandle];
+ if (ret == FDT_INVALID_PHANDLE) {
+ ret = next_phandle++;
+ phandles[phandle] = ret;
+ }
+
+ return ret;
+}
--
2.9.0
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