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staging: unisys: memregion: Embed memregion in struct channel 

This changes the API for visor_memregion_create() to require a
pre-allocated struct memregion. Embedding this in struct channel
avoids a layer of additional kmalloc()'s and error checks.

Signed-off-by: Jes Sorensen <Jes.Sorensen@redhat.com>
Signed-off-by: Benjamin Romer <benjamin.romer@unisys.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Jes Sorensen 2015-05-05 18:36:32 -04:00 committed by Greg Kroah-Hartman
parent 81c7492db0
commit b3cbceb36b
3 changed files with 20 additions and 28 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

36
drivers/staging/unisys/visorbus/visorchannel.c
View File

@ -30,7 +30,7 @@
#define MYDRVNAME "visorchannel"
struct visorchannel {
struct memregion *memregion; /* from visor_memregion_create() */
struct memregion memregion; /* from visor_memregion_create() */
struct channel_header chan_hdr;
uuid_le guid;
ulong size;
@ -63,19 +63,17 @@ visorchannel_create_guts(HOSTADDRESS physaddr, ulong channel_bytes,
if (!channel)
goto cleanup;
channel->memregion = NULL;
channel->needs_lock = needs_lock;
spin_lock_init(&channel->insert_lock);
spin_lock_init(&channel->remove_lock);
/* prepare chan_hdr (abstraction to read/write channel memory) */
memregion = visor_memregion_create(physaddr, size);
memregion = visor_memregion_create(&channel->memregion, physaddr, size);
if (!memregion)
goto cleanup;
channel->memregion = memregion;
err = visor_memregion_read(channel->memregion, 0, &channel->chan_hdr,
err = visor_memregion_read(&channel->memregion, 0, &channel->chan_hdr,
sizeof(struct channel_header));
if (err)
goto cleanup;
@ -86,7 +84,7 @@ visorchannel_create_guts(HOSTADDRESS physaddr, ulong channel_bytes,
if (uuid_le_cmp(guid, NULL_UUID_LE) == 0)
guid = channel->chan_hdr.chtype;
err = visor_memregion_resize(channel->memregion, channel_bytes);
err = visor_memregion_resize(&channel->memregion, channel_bytes);
if (err)
goto cleanup;
@ -121,7 +119,7 @@ visorchannel_destroy(struct visorchannel *channel)
{
if (!channel)
return;
visor_memregion_destroy(channel->memregion);
visor_memregion_destroy(&channel->memregion);
kfree(channel);
}
EXPORT_SYMBOL_GPL(visorchannel_destroy);
@ -129,7 +127,7 @@ EXPORT_SYMBOL_GPL(visorchannel_destroy);
HOSTADDRESS
visorchannel_get_physaddr(struct visorchannel *channel)
{
return visor_memregion_get_physaddr(channel->memregion);
return visor_memregion_get_physaddr(&channel->memregion);
}
EXPORT_SYMBOL_GPL(visorchannel_get_physaddr);
@ -179,7 +177,7 @@ EXPORT_SYMBOL_GPL(visorchannel_get_uuid);
struct memregion *
visorchannel_get_memregion(struct visorchannel *channel)
{
return channel->memregion;
return &channel->memregion;
}
EXPORT_SYMBOL_GPL(visorchannel_get_memregion);
@ -190,7 +188,7 @@ visorchannel_read(struct visorchannel *channel, ulong offset,
int rc;
size_t size = sizeof(struct channel_header);
rc = visor_memregion_read(channel->memregion, offset, local, nbytes);
rc = visor_memregion_read(&channel->memregion, offset, local, nbytes);
if (rc && !offset && (nbytes >= size))
memcpy(&channel->chan_hdr, local, size);
return rc;
@ -205,7 +203,8 @@ visorchannel_write(struct visorchannel *channel, ulong offset,
if (!offset && nbytes >= size)
memcpy(&channel->chan_hdr, local, size);
return visor_memregion_write(channel->memregion, offset, local, nbytes);
return visor_memregion_write(&channel->memregion,
offset, local, nbytes);
}
EXPORT_SYMBOL_GPL(visorchannel_write);
@ -229,7 +228,7 @@ visorchannel_clear(struct visorchannel *channel, ulong offset, u8 ch,
if (nbytes < thisbytes)
thisbytes = nbytes;
err = visor_memregion_write(channel->memregion,
err = visor_memregion_write(&channel->memregion,
offset + written, buf, thisbytes);
if (err)
goto cleanup;
@ -270,7 +269,7 @@ EXPORT_SYMBOL_GPL(visorchannel_get_header);
* into host memory
*/
#define SIG_WRITE_FIELD(channel, queue, sig_hdr, FIELD) \
(visor_memregion_write(channel->memregion, \
(visor_memregion_write(&channel->memregion, \
SIG_QUEUE_OFFSET(&channel->chan_hdr, queue)+ \
offsetof(struct signal_queue_header, FIELD),\
&((sig_hdr)->FIELD), \
@ -286,7 +285,7 @@ sig_read_header(struct visorchannel *channel, u32 queue,
return FALSE;
/* Read the appropriate SIGNAL_QUEUE_HEADER into local memory. */
err = visor_memregion_read(channel->memregion,
err = visor_memregion_read(&channel->memregion,
SIG_QUEUE_OFFSET(&channel->chan_hdr, queue),
sig_hdr, sizeof(struct signal_queue_header));
if (err)
@ -303,7 +302,7 @@ sig_read_data(struct visorchannel *channel, u32 queue,
int signal_data_offset = SIG_DATA_OFFSET(&channel->chan_hdr, queue,
sig_hdr, slot);
err = visor_memregion_read(channel->memregion,
err = visor_memregion_read(&channel->memregion,
signal_data_offset,
data, sig_hdr->signal_size);
if (err)
@ -320,7 +319,7 @@ sig_write_data(struct visorchannel *channel, u32 queue,
int signal_data_offset = SIG_DATA_OFFSET(&channel->chan_hdr, queue,
sig_hdr, slot);
err = visor_memregion_write(channel->memregion,
err = visor_memregion_write(&channel->memregion,
signal_data_offset,
data, sig_hdr->signal_size);
if (err)
@ -383,7 +382,7 @@ signalinsert_inner(struct visorchannel *channel, u32 queue, void *msg)
sig_hdr.head = ((sig_hdr.head + 1) % sig_hdr.max_slots);
if (sig_hdr.head == sig_hdr.tail) {
sig_hdr.num_overflows++;
visor_memregion_write(channel->memregion,
visor_memregion_write(&channel->memregion,
SIG_QUEUE_OFFSET(&channel->chan_hdr,
queue) +
offsetof(struct signal_queue_header,
@ -495,9 +494,6 @@ visorchannel_debug(struct visorchannel *channel, int num_queues,
if (!channel)
return;
memregion = channel->memregion;
if (!memregion)
return;
addr = visor_memregion_get_physaddr(memregion);
nbytes_region = visor_memregion_get_nbytes(memregion);

3
drivers/staging/unisys/visorutil/memregion.h
View File

@ -29,7 +29,8 @@ struct memregion {
void __iomem *mapped;
};
struct memregion *visor_memregion_create(HOSTADDRESS physaddr, ulong nbytes);
struct memregion *visor_memregion_create(struct memregion *memregion,
HOSTADDRESS physaddr, ulong nbytes);
int visor_memregion_resize(struct memregion *memregion, ulong newsize);
int visor_memregion_read(struct memregion *memregion,
ulong offset, void *dest, ulong nbytes);

9
drivers/staging/unisys/visorutil/memregion_direct.c
View File

@ -29,14 +29,10 @@ static int mapit(struct memregion *memregion);
static void unmapit(struct memregion *memregion);
struct memregion *
visor_memregion_create(HOSTADDRESS physaddr, ulong nbytes)
visor_memregion_create(struct memregion *memregion,
HOSTADDRESS physaddr, ulong nbytes)
{
struct memregion *rc = NULL;
struct memregion *memregion;
memregion = kzalloc(sizeof(*memregion), GFP_KERNEL | __GFP_NORETRY);
if (memregion == NULL)
return NULL;
memregion->physaddr = physaddr;
memregion->nbytes = nbytes;
@ -148,6 +144,5 @@ visor_memregion_destroy(struct memregion *memregion)
if (!memregion)
return;
unmapit(memregion);
kfree(memregion);
}
EXPORT_SYMBOL_GPL(visor_memregion_destroy);