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IB/hfi1: Add shared ASIC structure

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Create a shared structure to exist between devices that share the
same ASIC.

Reviewed-by: Mitko Haralanov <mitko.haralanov@intel.com>
Reviewed-by: Easwar Hariharan <easwar.hariharan@intel.com>
Signed-off-by: Dean Luick <dean.luick@intel.com>
Signed-off-by: Jubin John <jubin.john@intel.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>
This commit is contained in:
Dean Luick 2016-03-05 08:49:45 -08:00 committed by Doug Ledford
parent 3afb6f637e
commit 78eb129d47
3 changed files with 54 additions and 3 deletions
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28
drivers/staging/rdma/hfi1/chip.c
View File

@ -13800,15 +13800,20 @@ void hfi1_start_cleanup(struct hfi1_devdata *dd)
((dev)->base_guid & ~(1ULL << GUID_HFI_INDEX_SHIFT))
/*
* Information can be shared between the two HFIs on the same ASIC
* in the same OS. This function finds the peer device and sets
* up a shared structure.
*
* Certain chip functions need to be initialized only once per asic
* instead of per-device. This function finds the peer device and
* checks whether that chip initialization needs to be done by this
* device.
*/
static void asic_should_init(struct hfi1_devdata *dd)
static int init_asic_data(struct hfi1_devdata *dd)
{
unsigned long flags;
struct hfi1_devdata *tmp, *peer = NULL;
int ret = 0;
spin_lock_irqsave(&hfi1_devs_lock, flags);
/* Find our peer device */
@ -13826,7 +13831,22 @@ static void asic_should_init(struct hfi1_devdata *dd)
*/
if (!peer || !(peer->flags & HFI1_DO_INIT_ASIC))
dd->flags |= HFI1_DO_INIT_ASIC;
if (peer) {
dd->asic_data = peer->asic_data;
} else {
dd->asic_data = kzalloc(sizeof(*dd->asic_data), GFP_KERNEL);
if (!dd->asic_data) {
ret = -ENOMEM;
goto done;
}
mutex_init(&dd->asic_data->asic_resource_mutex);
}
dd->asic_data->dds[dd->hfi1_id] = dd; /* self back-pointer */
done:
spin_unlock_irqrestore(&hfi1_devs_lock, flags);
return ret;
}
/*
@ -14076,8 +14096,10 @@ struct hfi1_devdata *hfi1_init_dd(struct pci_dev *pdev,
/* needs to be done before we look for the peer device */
read_guid(dd);
/* should this device init the ASIC block? */
asic_should_init(dd);
/* set up shared ASIC data with peer device */
ret = init_asic_data(dd);
if (ret)
goto bail_cleanup;
/* obtain chip sizes, reset chip CSRs */
init_chip(dd);

9
drivers/staging/rdma/hfi1/hfi.h
View File

@ -805,6 +805,12 @@ struct hfi1_temp {
u8 triggers; /* temperature triggers */
};
/* common data between shared ASIC HFIs */
struct hfi1_asic_data {
struct hfi1_devdata *dds[2]; /* back pointers */
struct mutex asic_resource_mutex;
};
/* device data struct now contains only "general per-device" info.
* fields related to a physical IB port are in a hfi1_pportdata struct.
*/
@ -880,6 +886,9 @@ struct hfi1_devdata {
wait_queue_head_t sdma_unfreeze_wq;
atomic_t sdma_unfreeze_count;
/* common data between shared ASIC HFIs in this OS */
struct hfi1_asic_data *asic_data;
/* hfi1_pportdata, points to array of (physical) port-specific
* data structs, indexed by pidx (0..n-1)
*/

20
drivers/staging/rdma/hfi1/init.c
View File

@ -974,6 +974,25 @@ void hfi1_free_ctxtdata(struct hfi1_devdata *dd, struct hfi1_ctxtdata *rcd)
kfree(rcd);
}
/*
* Release our hold on the shared asic data. If we are the last one,
* free the structure. Must be holding hfi1_devs_lock.
*/
static void release_asic_data(struct hfi1_devdata *dd)
{
int other;
if (!dd->asic_data)
return;
dd->asic_data->dds[dd->hfi1_id] = NULL;
other = dd->hfi1_id ? 0 : 1;
if (!dd->asic_data->dds[other]) {
/* we are the last holder, free it */
kfree(dd->asic_data);
}
dd->asic_data = NULL;
}
void hfi1_free_devdata(struct hfi1_devdata *dd)
{
unsigned long flags;
@ -981,6 +1000,7 @@ void hfi1_free_devdata(struct hfi1_devdata *dd)
spin_lock_irqsave(&hfi1_devs_lock, flags);
idr_remove(&hfi1_unit_table, dd->unit);
list_del(&dd->list);
release_asic_data(dd);
spin_unlock_irqrestore(&hfi1_devs_lock, flags);
free_platform_config(dd);
rcu_barrier(); /* wait for rcu callbacks to complete */