compote: channel creation

Signed-off-by: Jérôme Glisse <jglisse@redhat.com>

3 files changed, 32 insertions, 1 deletions

diff --git a/compote-uapi.h b/compote-uapi.h
index bbedb2a..83f5e8a 100644
--- a/compote-uapi.h
+++ b/compote-uapi.h
@@ -29,8 +29,18 @@ struct compote_ioctl_mem_free {
 	uint64_t		foffset;
 };
 
+struct compote_ioctl_channel_alloc {
+	uint64_t		channel;
+};
+
+struct compote_ioctl_channel_free {
+	uint64_t		channel;
+};
+
 /* Expose the address space of the calling process through hmm dummy dev file */
 #define COMPOTE_IOCTL_MEM_ALLOC		_IOWR('H', 0x00, struct compote_ioctl_mem_alloc)
 #define COMPOTE_IOCTL_MEM_FREE		_IOWR('H', 0x01, struct compote_ioctl_mem_free)
+#define COMPOTE_IOCTL_CHAN_ALLOC	_IOWR('H', 0x02, struct compote_ioctl_channel_alloc)
+#define COMPOTE_IOCTL_CHAN_FREE		_IOWR('H', 0x03, struct compote_ioctl_channel_free)
 
 #endif /* COMPOTE_UAPI_H */
diff --git a/compote.c b/compote.c
index 49a3ea9..61fc28d 100644
--- a/compote.c
+++ b/compote.c
@@ -31,8 +31,9 @@
 
 int compote_context_new(compote_context_t **ctxp)
 {
+    struct compote_ioctl_channel_alloc arg;
     compote_context_t *ctx;
-    int fd;
+    int fd, ret;
 
     fd = open("/dev/compote", O_RDWR, 0);
     if (fd < 0) {
@@ -46,8 +47,15 @@ int compote_context_new(compote_context_t **ctxp)
         return -ENOMEM;
     }
 
+    ctx->channel.id = -1UL;
     ctx->fd = fd;
 
+    ret = compote_context_ioctl(ctx, COMPOTE_IOCTL_CHAN_ALLOC, &arg);
+    if (ret) {
+        compote_context_del(&ctx);
+        return ret;
+    }
+
     *ctxp = ctx;
     return 0;
 }
@@ -57,6 +65,14 @@ void compote_context_del(compote_context_t **ctxp)
     compote_context_t *ctx = *ctxp;
 
     *ctxp = NULL;
+
+    if (ctx->channel.id != -1UL) {
+        struct compote_ioctl_channel_free arg;
+
+        arg.channel = ctx->channel.id;
+        compote_context_ioctl(ctx, COMPOTE_IOCTL_CHAN_FREE, &arg);
+    }
+
     close(ctx->fd);
     free(ctx);
 }
diff --git a/compote.h b/compote.h
index b7811fb..3b86673 100644
--- a/compote.h
+++ b/compote.h
@@ -19,7 +19,12 @@
 #include <stdint.h>
 
 typedef struct {
+    uint64_t                    id;
+} compote_channel_t;
+
+typedef struct {
     int                         fd;
+    compote_channel_t           channel;
 } compote_context_t;
 
 typedef struct {