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staging: unisys: Convert bus creation to use visor_device 

This patch removes the legacy bus_info struct and instead creates
and passes around a traditional struct device.

This allows us to remove a lot of the various look up code and
removes the doubt if the struct exists or not.

Half of the churn is just the conversion of visorchipset_bus_info
to visor_device.  Various cleanups include re-arranging the failure
paths to make more sense.

Signed-off-by: Don Zickus <dzickus@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:
Don Zickus 2015-06-04 09:22:41 -04:00 committed by Greg Kroah-Hartman
parent 65bd6e4607
commit d32517e392
4 changed files with 78 additions and 187 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
drivers/staging/unisys/include/visorbus.h
View File

@ -220,4 +220,7 @@ void visorchannel_debug(struct visorchannel *channel, int num_queues,
struct seq_file *seq, u32 off);
void __iomem *visorchannel_get_header(struct visorchannel *channel);
#define BUS_ROOT_DEVICE UINT_MAX
struct visor_device *visorbus_get_device_by_id(u32 bus_no, u32 dev_no,
struct visor_device *from);
#endif

133
drivers/staging/unisys/visorbus/visorbus_main.c
View File

@ -93,8 +93,8 @@ static struct workqueue_struct *periodic_dev_workqueue;
static long long bus_count; /** number of bus instances */
/** ever-increasing */
static void chipset_bus_create(struct visorchipset_bus_info *bus_info);
static void chipset_bus_destroy(struct visorchipset_bus_info *bus_info);
static void chipset_bus_create(struct visor_device *bus_info);
static void chipset_bus_destroy(struct visor_device *bus_info);
static void chipset_device_create(struct visorchipset_device_info *dev_info);
static void chipset_device_destroy(struct visorchipset_device_info *dev_info);
static void chipset_device_pause(struct visorchipset_device_info *dev_info);
@ -950,8 +950,7 @@ EXPORT_SYMBOL_GPL(visorbus_disable_channel_interrupts);
*/
static int
create_visor_device(struct visor_device *bdev,
struct visorchipset_device_info *dev_info,
u64 partition_handle)
struct visorchipset_device_info *dev_info)
{
int rc = -1;
struct visor_device *dev = NULL;
@ -1161,8 +1160,7 @@ static void
fix_vbus_dev_info(struct visor_device *visordev)
{
int i;
struct visorchipset_bus_info bus_info;
struct visor_device *dev = NULL;
struct visor_device *bdev;
struct visor_driver *visordrv;
int bus_no = visordev->chipset_bus_no;
int dev_no = visordev->chipset_dev_no;
@ -1174,17 +1172,14 @@ fix_vbus_dev_info(struct visor_device *visordev)
return;
hdr_info = (struct spar_vbus_headerinfo *)visordev->vbus_hdr_info;
if (!hdr_info)
return;
bdev = visorbus_get_device_by_id(bus_no, BUS_ROOT_DEVICE, NULL);
if (!bdev)
return;
visordrv = to_visor_driver(visordev->device.driver);
if (!visorchipset_get_bus_info(bus_no, &bus_info))
return;
dev = (struct visor_device *)(bus_info.bus_driver_context);
if (!dev)
return;
if (!hdr_info)
return;
/* Within the list of device types (by GUID) that the driver
* says it supports, find out which one of those types matches
@ -1203,51 +1198,45 @@ fix_vbus_dev_info(struct visor_device *visordev)
bus_device_info_init(&dev_info, chan_type_name,
visordrv->name, visordrv->version,
visordrv->vertag);
write_vbus_dev_info(dev->visorchannel, hdr_info, &dev_info, dev_no);
write_vbus_dev_info(bdev->visorchannel, hdr_info, &dev_info, dev_no);
/* Re-write bus+chipset info, because it is possible that this
* was previously written by our evil counterpart, virtpci.
*/
write_vbus_chp_info(dev->visorchannel, hdr_info, &chipset_driverinfo);
write_vbus_bus_info(dev->visorchannel, hdr_info, &clientbus_driverinfo);
write_vbus_chp_info(bdev->visorchannel, hdr_info, &chipset_driverinfo);
write_vbus_bus_info(bdev->visorchannel, hdr_info,
&clientbus_driverinfo);
}
/** Create a device instance for the visor bus itself.
*/
static struct visor_device *
create_bus_instance(struct visorchipset_bus_info *bus_info)
static int
create_bus_instance(struct visor_device *dev)
{
struct visor_device *rc = NULL;
struct visor_device *dev = NULL;
int id = bus_info->bus_no;
int rc;
int id = dev->chipset_bus_no;
struct spar_vbus_headerinfo *hdr_info;
POSTCODE_LINUX_2(BUS_CREATE_ENTRY_PC, POSTCODE_SEVERITY_INFO);
dev = kzalloc(sizeof(*dev), GFP_KERNEL);
if (!dev) {
POSTCODE_LINUX_2(MALLOC_FAILURE_PC, POSTCODE_SEVERITY_ERR);
rc = NULL;
goto away;
}
hdr_info = kzalloc(sizeof(*hdr_info), GFP_KERNEL);
if (!hdr_info) {
rc = NULL;
goto away_mem;
rc = -1;
goto away;
}
dev_set_name(&dev->device, "visorbus%d", id);
dev->device.bus = &visorbus_type;
dev->device.groups = visorbus_groups;
dev->device.release = visorbus_release_busdevice;
if (device_register(&dev->device) < 0) {
POSTCODE_LINUX_3(DEVICE_CREATE_FAILURE_PC, id,
POSTCODE_SEVERITY_ERR);
rc = NULL;
goto away_mem2;
rc = -1;
goto away_mem;
}
dev->chipset_bus_no = id;
dev->visorchannel = bus_info->visorchannel;
if (get_vbus_header_info(dev->visorchannel, hdr_info) >= 0) {
dev->vbus_hdr_info = (void *)hdr_info;
write_vbus_chp_info(dev->visorchannel, hdr_info,
@ -1259,16 +1248,11 @@ create_bus_instance(struct visorchipset_bus_info *bus_info)
}
bus_count++;
list_add_tail(&dev->list_all, &list_all_bus_instances);
if (id == 0)
dev = dev; /* for testing ONLY */
dev_set_drvdata(&dev->device, dev);
rc = dev;
return rc;
return 0;
away_mem2:
kfree(hdr_info);
away_mem:
kfree(dev);
kfree(hdr_info);
away:
return rc;
}
@ -1331,57 +1315,38 @@ remove_all_visor_devices(void)
}
static void
chipset_bus_create(struct visorchipset_bus_info *bus_info)
chipset_bus_create(struct visor_device *dev)
{
struct visor_device *dev;
int rc = -1;
u32 bus_no = bus_info->bus_no;
int rc;
u32 bus_no = dev->chipset_bus_no;
POSTCODE_LINUX_3(BUS_CREATE_ENTRY_PC, bus_no, POSTCODE_SEVERITY_INFO);
dev = create_bus_instance(bus_info);
if (!dev)
goto away;
if (!visorchipset_set_bus_context(bus_info, dev))
goto away;
rc = create_bus_instance(dev);
POSTCODE_LINUX_3(BUS_CREATE_EXIT_PC, bus_no, POSTCODE_SEVERITY_INFO);
rc = 0;
away:
if (rc < 0) {
if (rc < 0)
POSTCODE_LINUX_3(BUS_CREATE_FAILURE_PC, bus_no,
POSTCODE_SEVERITY_ERR);
return;
}
POSTCODE_LINUX_3(CHIPSET_INIT_SUCCESS_PC, bus_no,
POSTCODE_SEVERITY_INFO);
else
POSTCODE_LINUX_3(CHIPSET_INIT_SUCCESS_PC, bus_no,
POSTCODE_SEVERITY_INFO);
if (chipset_responders.bus_create)
(*chipset_responders.bus_create) (bus_info, rc);
(*chipset_responders.bus_create) (dev, rc);
}
static void
chipset_bus_destroy(struct visorchipset_bus_info *bus_info)
chipset_bus_destroy(struct visor_device *dev)
{
struct visor_device *dev;
int rc = -1;
dev = (struct visor_device *)(bus_info->bus_driver_context);
if (!dev)
goto away;
remove_bus_instance(dev);
if (!visorchipset_set_bus_context(bus_info, NULL))
goto away;
rc = 0;
away:
if (rc < 0)
return;
if (chipset_responders.bus_destroy)
(*chipset_responders.bus_destroy)(bus_info, rc);
(*chipset_responders.bus_destroy)(dev, 0);
}
static void
chipset_device_create(struct visorchipset_device_info *dev_info)
{
struct visorchipset_bus_info bus_info;
struct visor_device *dev = NULL;
struct visor_device *bdev;
int rc = -1;
u32 bus_no = dev_info->bus_no;
u32 dev_no = dev_info->dev_no;
@ -1389,24 +1354,24 @@ chipset_device_create(struct visorchipset_device_info *dev_info)
POSTCODE_LINUX_4(DEVICE_CREATE_ENTRY_PC, dev_no, bus_no,
POSTCODE_SEVERITY_INFO);
if (!visorchipset_get_bus_info(bus_no, &bus_info))
bdev = visorbus_get_device_by_id(bus_no, BUS_ROOT_DEVICE, NULL);
if (!bdev)
goto away;
POSTCODE_LINUX_4(DEVICE_CREATE_EXIT_PC, dev_no, bus_no,
POSTCODE_SEVERITY_INFO);
rc = 0;
rc = create_visor_device(bdev, dev_info);
away:
if (rc < 0) {
POSTCODE_LINUX_4(DEVICE_CREATE_FAILURE_PC, dev_no, bus_no,
POSTCODE_SEVERITY_ERR);
return;
}
dev = (struct visor_device *)(bus_info.bus_driver_context);
rc = create_visor_device(dev, dev_info, bus_info.partition_handle);
POSTCODE_LINUX_4(DEVICE_CREATE_SUCCESS_PC, dev_no, bus_no,
POSTCODE_SEVERITY_INFO);
if (rc < 0)
if (chipset_responders.device_create)
(*chipset_responders.device_create)(dev_info, rc);
}
POSTCODE_LINUX_4(DEVICE_CREATE_SUCCESS_PC, dev_no, bus_no,
POSTCODE_SEVERITY_INFO);
}
static void

34
drivers/staging/unisys/visorbus/visorbus_private.h
View File

@ -49,35 +49,13 @@ struct visorchipset_device_info {
void *bus_driver_context;
};
/** Attributes for a particular Supervisor bus.
* (For a service partition acting as the server for buses/devices, there
* is a 1-to-1 relationship between busses and guest partitions.)
* Any visorchipset client can query these attributes using
* visorchipset_get_client_bus_info() or visorchipset_get_bus_info().
*/
struct visorchipset_bus_info {
struct list_head entry;
u32 bus_no;
struct visorchipset_state state;
struct visorchannel *visorchannel;
uuid_le partition_uuid;
u64 partition_handle;
u8 *name; /* UTF8 */
u8 *description; /* UTF8 */
u64 reserved1;
u32 reserved2;
struct controlvm_message_header *pending_msg_hdr;/* CONTROLVM MsgHdr */
/** For private use by the bus driver */
void *bus_driver_context;
};
/* These functions will be called from within visorchipset when certain
* events happen. (The implementation of these functions is outside of
* visorchipset.)
*/
struct visorchipset_busdev_notifiers {
void (*bus_create)(struct visorchipset_bus_info *bus_info);
void (*bus_destroy)(struct visorchipset_bus_info *bus_info);
void (*bus_create)(struct visor_device *bus_info);
void (*bus_destroy)(struct visor_device *bus_info);
void (*device_create)(struct visorchipset_device_info *bus_info);
void (*device_destroy)(struct visorchipset_device_info *bus_info);
void (*device_pause)(struct visorchipset_device_info *bus_info);
@ -91,8 +69,8 @@ struct visorchipset_busdev_notifiers {
* -1 = it failed
*/
struct visorchipset_busdev_responders {
void (*bus_create)(struct visorchipset_bus_info *p, int response);
void (*bus_destroy)(struct visorchipset_bus_info *p, int response);
void (*bus_create)(struct visor_device *p, int response);
void (*bus_destroy)(struct visor_device *p, int response);
void (*device_create)(struct visorchipset_device_info *p, int response);
void (*device_destroy)(struct visorchipset_device_info *p,
int response);
@ -112,10 +90,10 @@ visorchipset_register_busdev(
struct ultra_vbus_deviceinfo *driver_info);
bool visorchipset_get_bus_info(u32 bus_no,
struct visorchipset_bus_info *bus_info);
struct visor_device *bus_info);
bool visorchipset_get_device_info(u32 bus_no, u32 dev_no,
struct visorchipset_device_info *dev_info);
bool visorchipset_set_bus_context(struct visorchipset_bus_info *bus_info,
bool visorchipset_set_bus_context(struct visor_device *bus_info,
void *context);
/* visorbus init and exit functions */

95
drivers/staging/unisys/visorbus/visorchipset.c
View File

@ -56,8 +56,6 @@
#define UNISYS_SPAR_ID_ECX 0x70537379
#define UNISYS_SPAR_ID_EDX 0x34367261
#define BUS_ROOT_DEVICE UINT_MAX
/*
* Module parameters
*/
@ -230,8 +228,8 @@ static void parahotplug_process_list(void);
*/
static struct visorchipset_busdev_notifiers busdev_notifiers;
static void bus_create_response(struct visorchipset_bus_info *p, int response);
static void bus_destroy_response(struct visorchipset_bus_info *p, int response);
static void bus_create_response(struct visor_device *p, int response);
static void bus_destroy_response(struct visor_device *p, int response);
static void device_create_response(struct visorchipset_device_info *p,
int response);
static void device_destroy_response(struct visorchipset_device_info *p,
@ -698,16 +696,6 @@ static ssize_t remaining_steps_store(struct device *dev,
return count;
}
static void
bus_info_clear(void *v)
{
struct visorchipset_bus_info *p = (struct visorchipset_bus_info *) v;
kfree(p->name);
kfree(p->description);
memset(p, 0, sizeof(struct visorchipset_bus_info));
}
static void
dev_info_clear(void *v)
{
@ -756,19 +744,6 @@ struct visor_device *visorbus_get_device_by_id(u32 bus_no, u32 dev_no,
}
EXPORT_SYMBOL(visorbus_get_device_by_id);
static struct visorchipset_bus_info *
bus_find(struct list_head *list, u32 bus_no)
{
struct visorchipset_bus_info *p;
list_for_each_entry(p, list, entry) {
if (p->bus_no == bus_no)
return p;
}
return NULL;
}
static struct visorchipset_device_info *
device_find(struct list_head *list, u32 bus_no, u32 dev_no)
{
@ -842,15 +817,8 @@ EXPORT_SYMBOL_GPL(visorchipset_register_busdev);
static void
cleanup_controlvm_structures(void)
{
struct visorchipset_bus_info *bi, *tmp_bi;
struct visorchipset_device_info *di, *tmp_di;
list_for_each_entry_safe(bi, tmp_bi, &bus_info_list, entry) {
bus_info_clear(bi);
list_del(&bi->entry);
kfree(bi);
}
list_for_each_entry_safe(di, tmp_di, &dev_info_list, entry) {
dev_info_clear(di);
list_del(&di->entry);
@ -1017,7 +985,7 @@ device_responder(enum controlvm_id cmd_id,
}
static void
bus_epilog(struct visorchipset_bus_info *bus_info,
bus_epilog(struct visor_device *bus_info,
u32 cmd, struct controlvm_message_header *msg_hdr,
int response, bool need_response)
{
@ -1207,10 +1175,10 @@ bus_create(struct controlvm_message *inmsg)
struct controlvm_message_packet *cmd = &inmsg->cmd;
u32 bus_no = cmd->create_bus.bus_no;
int rc = CONTROLVM_RESP_SUCCESS;
struct visorchipset_bus_info *bus_info;
struct visor_device *bus_info;
struct visorchannel *visorchannel;
bus_info = bus_find(&bus_info_list, bus_no);
bus_info = visorbus_get_device_by_id(bus_no, BUS_ROOT_DEVICE, NULL);
if (bus_info && (bus_info->state.created == 1)) {
POSTCODE_LINUX_3(BUS_CREATE_FAILURE_PC, bus_no,
POSTCODE_SEVERITY_ERR);
@ -1225,8 +1193,8 @@ bus_create(struct controlvm_message *inmsg)
goto cleanup;
}
INIT_LIST_HEAD(&bus_info->entry);
bus_info->bus_no = bus_no;
bus_info->chipset_bus_no = bus_no;
bus_info->chipset_dev_no = BUS_ROOT_DEVICE;
POSTCODE_LINUX_3(BUS_CREATE_ENTRY_PC, bus_no, POSTCODE_SEVERITY_INFO);
@ -1244,7 +1212,6 @@ bus_create(struct controlvm_message *inmsg)
goto cleanup;
}
bus_info->visorchannel = visorchannel;
list_add(&bus_info->entry, &bus_info_list);
POSTCODE_LINUX_3(BUS_CREATE_EXIT_PC, bus_no, POSTCODE_SEVERITY_INFO);
@ -1258,10 +1225,10 @@ bus_destroy(struct controlvm_message *inmsg)
{
struct controlvm_message_packet *cmd = &inmsg->cmd;
u32 bus_no = cmd->destroy_bus.bus_no;
struct visorchipset_bus_info *bus_info;
struct visor_device *bus_info;
int rc = CONTROLVM_RESP_SUCCESS;
bus_info = bus_find(&bus_info_list, bus_no);
bus_info = visorbus_get_device_by_id(bus_no, BUS_ROOT_DEVICE, NULL);
if (!bus_info)
rc = -CONTROLVM_RESP_ERROR_BUS_INVALID;
else if (bus_info->state.created == 0)
@ -1269,6 +1236,8 @@ bus_destroy(struct controlvm_message *inmsg)
bus_epilog(bus_info, CONTROLVM_BUS_DESTROY, &inmsg->hdr,
rc, inmsg->hdr.flags.response_expected == 1);
/* bus_info is freed as part of the busdevice_release function */
}
static void
@ -1277,15 +1246,14 @@ bus_configure(struct controlvm_message *inmsg,
{
struct controlvm_message_packet *cmd = &inmsg->cmd;
u32 bus_no;
struct visorchipset_bus_info *bus_info;
struct visor_device *bus_info;
int rc = CONTROLVM_RESP_SUCCESS;
char s[99];
bus_no = cmd->configure_bus.bus_no;
POSTCODE_LINUX_3(BUS_CONFIGURE_ENTRY_PC, bus_no,
POSTCODE_SEVERITY_INFO);
bus_info = bus_find(&bus_info_list, bus_no);
bus_info = visorbus_get_device_by_id(bus_no, BUS_ROOT_DEVICE, NULL);
if (!bus_info) {
POSTCODE_LINUX_3(BUS_CONFIGURE_FAILURE_PC, bus_no,
POSTCODE_SEVERITY_ERR);
@ -1305,7 +1273,6 @@ bus_configure(struct controlvm_message *inmsg,
parser_param_start(parser_ctx, PARSERSTRING_NAME);
bus_info->name = parser_string_get(parser_ctx);
visorchannel_uuid_id(&bus_info->partition_uuid, s);
POSTCODE_LINUX_3(BUS_CONFIGURE_EXIT_PC, bus_no,
POSTCODE_SEVERITY_INFO);
}
@ -1320,7 +1287,7 @@ my_device_create(struct controlvm_message *inmsg)
u32 bus_no = cmd->create_device.bus_no;
u32 dev_no = cmd->create_device.dev_no;
struct visorchipset_device_info *dev_info;
struct visorchipset_bus_info *bus_info;
struct visor_device *bus_info;
struct visorchannel *visorchannel;
int rc = CONTROLVM_RESP_SUCCESS;
@ -1331,7 +1298,7 @@ my_device_create(struct controlvm_message *inmsg)
rc = -CONTROLVM_RESP_ERROR_ALREADY_DONE;
goto cleanup;
}
bus_info = bus_find(&bus_info_list, bus_no);
bus_info = visorbus_get_device_by_id(bus_no, dev_no, NULL);
if (!bus_info) {
POSTCODE_LINUX_4(DEVICE_CREATE_FAILURE_PC, dev_no, bus_no,
POSTCODE_SEVERITY_ERR);
@ -2134,14 +2101,15 @@ cleanup:
}
static void
bus_create_response(struct visorchipset_bus_info *bus_info, int response)
bus_create_response(struct visor_device *bus_info, int response)
{
if (response >= 0) {
bus_info->state.created = 1;
} else {
if (response != -CONTROLVM_RESP_ERROR_ALREADY_DONE)
/* undo the row we just created... */
busdevices_del(&dev_info_list, bus_info->bus_no);
busdevices_del(&dev_info_list,
bus_info->chipset_bus_no);
}
bus_responder(CONTROLVM_BUS_CREATE, bus_info->pending_msg_hdr,
@ -2152,7 +2120,7 @@ bus_create_response(struct visorchipset_bus_info *bus_info, int response)
}
static void
bus_destroy_response(struct visorchipset_bus_info *bus_info, int response)
bus_destroy_response(struct visor_device *bus_info, int response)
{
bus_responder(CONTROLVM_BUS_DESTROY, bus_info->pending_msg_hdr,
response);
@ -2160,8 +2128,7 @@ bus_destroy_response(struct visorchipset_bus_info *bus_info, int response)
kfree(bus_info->pending_msg_hdr);
bus_info->pending_msg_hdr = NULL;
bus_info_clear(bus_info);
busdevices_del(&dev_info_list, bus_info->bus_no);
busdevices_del(&dev_info_list, bus_info->chipset_bus_no);
}
static void
@ -2212,28 +2179,6 @@ device_resume_response(struct visorchipset_device_info *dev_info, int response)
dev_info->pending_msg_hdr = NULL;
}
bool
visorchipset_get_bus_info(u32 bus_no, struct visorchipset_bus_info *bus_info)
{
void *p = bus_find(&bus_info_list, bus_no);
if (!p)
return false;
memcpy(bus_info, p, sizeof(struct visorchipset_bus_info));
return true;
}
EXPORT_SYMBOL_GPL(visorchipset_get_bus_info);
bool
visorchipset_set_bus_context(struct visorchipset_bus_info *p, void *context)
{
if (!p)
return false;
p->bus_driver_context = context;
return true;
}
EXPORT_SYMBOL_GPL(visorchipset_set_bus_context);
bool
visorchipset_get_device_info(u32 bus_no, u32 dev_no,
struct visorchipset_device_info *dev_info)