diff options
| -rw-r--r-- | drivers/net/ipa/gsi.h | 9 | ||||
| -rw-r--r-- | drivers/net/ipa/gsi_trans.c | 89 |
2 files changed, 84 insertions, 14 deletions
diff --git a/drivers/net/ipa/gsi.h b/drivers/net/ipa/gsi.h index 23de5f67374c..13468704c400 100644 --- a/drivers/net/ipa/gsi.h +++ b/drivers/net/ipa/gsi.h @@ -82,7 +82,14 @@ struct gsi_trans_pool { struct gsi_trans_info { atomic_t tre_avail; /* TREs available for allocation */ - struct gsi_trans_pool pool; /* transaction pool */ + + u16 free_id; /* first free trans in array */ + u16 allocated_id; /* first allocated transaction */ + u16 committed_id; /* first committed transaction */ + u16 pending_id; /* first pending transaction */ + u16 completed_id; /* first completed transaction */ + u16 polled_id; /* first polled transaction */ + struct gsi_trans *trans; /* transaction array */ struct gsi_trans **map; /* TRE -> transaction map */ struct gsi_trans_pool sg_pool; /* scatterlist pool */ diff --git a/drivers/net/ipa/gsi_trans.c b/drivers/net/ipa/gsi_trans.c index 18e7e8c405be..4eef1480c200 100644 --- a/drivers/net/ipa/gsi_trans.c +++ b/drivers/net/ipa/gsi_trans.c @@ -252,6 +252,9 @@ static void gsi_trans_move_committed(struct gsi_trans *trans) list_move_tail(&trans->links, &trans_info->committed); spin_unlock_bh(&trans_info->spinlock); + + /* This allocated transaction is now committed */ + trans_info->allocated_id++; } /* Move transactions from the committed list to the pending list */ @@ -259,7 +262,9 @@ static void gsi_trans_move_pending(struct gsi_trans *trans) { struct gsi_channel *channel = &trans->gsi->channel[trans->channel_id]; struct gsi_trans_info *trans_info = &channel->trans_info; + u16 trans_index = trans - &trans_info->trans[0]; struct list_head list; + u16 delta; spin_lock_bh(&trans_info->spinlock); @@ -268,6 +273,10 @@ static void gsi_trans_move_pending(struct gsi_trans *trans) list_splice_tail(&list, &trans_info->pending); spin_unlock_bh(&trans_info->spinlock); + + /* These committed transactions are now pending */ + delta = trans_index - trans_info->committed_id + 1; + trans_info->committed_id += delta % channel->tre_count; } /* Move a transaction and all of its predecessors from the pending list @@ -277,7 +286,9 @@ void gsi_trans_move_complete(struct gsi_trans *trans) { struct gsi_channel *channel = &trans->gsi->channel[trans->channel_id]; struct gsi_trans_info *trans_info = &channel->trans_info; + u16 trans_index = trans - trans_info->trans; struct list_head list; + u16 delta; spin_lock_bh(&trans_info->spinlock); @@ -286,6 +297,11 @@ void gsi_trans_move_complete(struct gsi_trans *trans) list_splice_tail(&list, &trans_info->complete); spin_unlock_bh(&trans_info->spinlock); + + /* These pending transactions are now completed */ + delta = trans_index - trans_info->pending_id + 1; + delta %= channel->tre_count; + trans_info->pending_id += delta; } /* Move a transaction from the completed list to the polled list */ @@ -293,12 +309,23 @@ void gsi_trans_move_polled(struct gsi_trans *trans) { struct gsi_channel *channel = &trans->gsi->channel[trans->channel_id]; struct gsi_trans_info *trans_info = &channel->trans_info; + u16 trans_index; spin_lock_bh(&trans_info->spinlock); list_move_tail(&trans->links, &trans_info->polled); + trans = list_first_entry(&trans_info->polled, + struct gsi_trans, links); + spin_unlock_bh(&trans_info->spinlock); + + /* This completed transaction is now polled */ + trans_info->completed_id++; + + WARN_ON(trans_info->polled_id == trans_info->completed_id); + trans_index = trans_info->polled_id % channel->tre_count; + WARN_ON(trans != &trans_info->trans[trans_index]); } /* Reserve some number of TREs on a channel. Returns true if successful */ @@ -343,20 +370,22 @@ struct gsi_trans *gsi_channel_trans_alloc(struct gsi *gsi, u32 channel_id, struct gsi_channel *channel = &gsi->channel[channel_id]; struct gsi_trans_info *trans_info; struct gsi_trans *trans; + u16 trans_index; if (WARN_ON(tre_count > channel->trans_tre_max)) return NULL; trans_info = &channel->trans_info; - /* We reserve the TREs now, but consume them at commit time. - * If there aren't enough available, we're done. - */ + /* If we can't reserve the TREs for the transaction, we're done */ if (!gsi_trans_tre_reserve(trans_info, tre_count)) return NULL; - /* Allocate and initialize non-zero fields in the transaction */ - trans = gsi_trans_pool_alloc(&trans_info->pool, 1); + trans_index = trans_info->free_id % channel->tre_count; + trans = &trans_info->trans[trans_index]; + memset(trans, 0, sizeof(*trans)); + + /* Initialize non-zero fields in the transaction */ trans->gsi = gsi; trans->channel_id = channel_id; trans->rsvd_count = tre_count; @@ -367,6 +396,10 @@ struct gsi_trans *gsi_channel_trans_alloc(struct gsi *gsi, u32 channel_id, sg_init_marker(trans->sgl, tre_count); trans->direction = direction; + refcount_set(&trans->refcount, 1); + + /* This free transaction will now be allocated */ + trans_info->free_id++; spin_lock_bh(&trans_info->spinlock); @@ -374,16 +407,17 @@ struct gsi_trans *gsi_channel_trans_alloc(struct gsi *gsi, u32 channel_id, spin_unlock_bh(&trans_info->spinlock); - refcount_set(&trans->refcount, 1); - return trans; } /* Free a previously-allocated transaction */ void gsi_trans_free(struct gsi_trans *trans) { + struct gsi_channel *channel = &trans->gsi->channel[trans->channel_id]; refcount_t *refcount = &trans->refcount; struct gsi_trans_info *trans_info; + struct gsi_trans *polled; + u16 trans_index; bool last; /* We must hold the lock to release the last reference */ @@ -399,13 +433,36 @@ void gsi_trans_free(struct gsi_trans *trans) if (last) list_del(&trans->links); + polled = list_first_entry_or_null(&trans_info->polled, + struct gsi_trans, links); + spin_unlock_bh(&trans_info->spinlock); if (!last) return; - if (trans->used_count) + /* Unused transactions are allocated but never committed, pending, + * completed, or polled. + */ + if (!trans->used_count) { + trans_info->allocated_id++; + trans_info->committed_id++; + trans_info->pending_id++; + trans_info->completed_id++; + } else { ipa_gsi_trans_release(trans); + } + + /* This transaction is now free */ + trans_info->polled_id++; + + if (polled) { + trans_index = trans_info->polled_id % channel->tre_count; + WARN_ON(polled != &trans_info->trans[trans_index]); + } else { + WARN_ON(trans_info->polled_id != + trans_info->completed_id); + } /* Releasing the reserved TREs implicitly frees the sgl[] and * (if present) info[] arrays, plus the transaction itself. @@ -736,10 +793,16 @@ int gsi_channel_trans_init(struct gsi *gsi, u32 channel_id) * modulo that number to determine the next one that's free. * Transactions are allocated one at a time. */ - ret = gsi_trans_pool_init(&trans_info->pool, sizeof(struct gsi_trans), - tre_max, 1); - if (ret) + trans_info->trans = kcalloc(tre_count, sizeof(*trans_info->trans), + GFP_KERNEL); + if (!trans_info->trans) return -ENOMEM; + trans_info->free_id = 0; /* all modulo channel->tre_count */ + trans_info->allocated_id = 0; + trans_info->committed_id = 0; + trans_info->pending_id = 0; + trans_info->completed_id = 0; + trans_info->polled_id = 0; /* A completion event contains a pointer to the TRE that caused * the event (which will be the last one used by the transaction). @@ -777,7 +840,7 @@ int gsi_channel_trans_init(struct gsi *gsi, u32 channel_id) err_map_free: kfree(trans_info->map); err_trans_free: - gsi_trans_pool_exit(&trans_info->pool); + kfree(trans_info->trans); dev_err(gsi->dev, "error %d initializing channel %u transactions\n", ret, channel_id); @@ -791,6 +854,6 @@ void gsi_channel_trans_exit(struct gsi_channel *channel) struct gsi_trans_info *trans_info = &channel->trans_info; gsi_trans_pool_exit(&trans_info->sg_pool); - gsi_trans_pool_exit(&trans_info->pool); + kfree(trans_info->trans); kfree(trans_info->map); } |