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author | aliguori <aliguori@c046a42c-6fe2-441c-8c8c-71466251a162> | 2009-01-22 16:59:16 +0000 |
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committer | aliguori <aliguori@c046a42c-6fe2-441c-8c8c-71466251a162> | 2009-01-22 16:59:16 +0000 |
commit | ba223c29da480b40b38678c66636ee9910973a47 (patch) | |
tree | f9c9ce3927ed8ed1e16bc1f21c627db1a9fcab14 /exec.c | |
parent | 6d16c2f88f2a866bec27c4d170ddd97ee8e41a0e (diff) | |
download | qemu-ba223c29da480b40b38678c66636ee9910973a47.zip qemu-ba223c29da480b40b38678c66636ee9910973a47.tar.gz qemu-ba223c29da480b40b38678c66636ee9910973a47.tar.bz2 |
Add map client retry notification (Avi Kivity)
The target memory mapping API may fail if the bounce buffer resources
are exhausted. Add a notification mechanism to allow clients to retry
the mapping operation when resources become available again.
Signed-off-by: Avi Kivity <avi@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@6395 c046a42c-6fe2-441c-8c8c-71466251a162
Diffstat (limited to 'exec.c')
-rw-r--r-- | exec.c | 40 |
1 files changed, 40 insertions, 0 deletions
@@ -3053,10 +3053,49 @@ typedef struct { static BounceBuffer bounce; +typedef struct MapClient { + void *opaque; + void (*callback)(void *opaque); + LIST_ENTRY(MapClient) link; +} MapClient; + +static LIST_HEAD(map_client_list, MapClient) map_client_list + = LIST_HEAD_INITIALIZER(map_client_list); + +void *cpu_register_map_client(void *opaque, void (*callback)(void *opaque)) +{ + MapClient *client = qemu_malloc(sizeof(*client)); + + client->opaque = opaque; + client->callback = callback; + LIST_INSERT_HEAD(&map_client_list, client, link); + return client; +} + +void cpu_unregister_map_client(void *_client) +{ + MapClient *client = (MapClient *)_client; + + LIST_REMOVE(client, link); +} + +static void cpu_notify_map_clients(void) +{ + MapClient *client; + + while (!LIST_EMPTY(&map_client_list)) { + client = LIST_FIRST(&map_client_list); + client->callback(client->opaque); + LIST_REMOVE(client, link); + } +} + /* Map a physical memory region into a host virtual address. * May map a subset of the requested range, given by and returned in *plen. * May return NULL if resources needed to perform the mapping are exhausted. * Use only for reads OR writes - not for read-modify-write operations. + * Use cpu_register_map_client() to know when retrying the map operation is + * likely to succeed. */ void *cpu_physical_memory_map(target_phys_addr_t addr, target_phys_addr_t *plen, @@ -3146,6 +3185,7 @@ void cpu_physical_memory_unmap(void *buffer, target_phys_addr_t len, } qemu_free(bounce.buffer); bounce.buffer = NULL; + cpu_notify_map_clients(); } /* warning: addr must be aligned */ |