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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) 2021 Broadcom. All Rights Reserved. The term
* “Broadcom” refers to Broadcom Inc. and/or its subsidiaries.
*/
#include "efct_driver.h"
#include "efct_hw.h"
#include "efct_io.h"
struct efct_io_pool {
struct efct *efct;
spinlock_t lock; /* IO pool lock */
u32 io_num_ios; /* Total IOs allocated */
struct efct_io *ios[EFCT_NUM_SCSI_IOS];
struct list_head freelist;
};
struct efct_io_pool *
efct_io_pool_create(struct efct *efct, u32 num_sgl)
{
u32 i = 0;
struct efct_io_pool *io_pool;
struct efct_io *io;
/* Allocate the IO pool */
io_pool = kzalloc(sizeof(*io_pool), GFP_KERNEL);
if (!io_pool)
return NULL;
io_pool->efct = efct;
INIT_LIST_HEAD(&io_pool->freelist);
/* initialize IO pool lock */
spin_lock_init(&io_pool->lock);
for (i = 0; i < EFCT_NUM_SCSI_IOS; i++) {
io = kzalloc(sizeof(*io), GFP_KERNEL);
if (!io)
break;
io_pool->io_num_ios++;
io_pool->ios[i] = io;
io->tag = i;
io->instance_index = i;
/* Allocate a response buffer */
io->rspbuf.size = SCSI_RSP_BUF_LENGTH;
io->rspbuf.virt = dma_alloc_coherent(&efct->pci->dev,
io->rspbuf.size,
&io->rspbuf.phys, GFP_KERNEL);
if (!io->rspbuf.virt) {
efc_log_err(efct, "dma_alloc rspbuf failed\n");
efct_io_pool_free(io_pool);
return NULL;
}
/* Allocate SGL */
io->sgl = kzalloc(sizeof(*io->sgl) * num_sgl, GFP_KERNEL);
if (!io->sgl) {
efct_io_pool_free(io_pool);
return NULL;
}
io->sgl_allocated = num_sgl;
io->sgl_count = 0;
INIT_LIST_HEAD(&io->list_entry);
list_add_tail(&io->list_entry, &io_pool->freelist);
}
return io_pool;
}
int
efct_io_pool_free(struct efct_io_pool *io_pool)
{
struct efct *efct;
u32 i;
struct efct_io *io;
if (io_pool) {
efct = io_pool->efct;
for (i = 0; i < io_pool->io_num_ios; i++) {
io = io_pool->ios[i];
if (!io)
continue;
kfree(io->sgl);
dma_free_coherent(&efct->pci->dev,
io->rspbuf.size, io->rspbuf.virt,
io->rspbuf.phys);
memset(&io->rspbuf, 0, sizeof(struct efc_dma));
}
kfree(io_pool);
efct->xport->io_pool = NULL;
}
return 0;
}
struct efct_io *
efct_io_pool_io_alloc(struct efct_io_pool *io_pool)
{
struct efct_io *io = NULL;
struct efct *efct;
unsigned long flags = 0;
efct = io_pool->efct;
spin_lock_irqsave(&io_pool->lock, flags);
if (!list_empty(&io_pool->freelist)) {
io = list_first_entry(&io_pool->freelist, struct efct_io,
list_entry);
list_del_init(&io->list_entry);
}
spin_unlock_irqrestore(&io_pool->lock, flags);
if (!io)
return NULL;
io->io_type = EFCT_IO_TYPE_MAX;
io->hio_type = EFCT_HW_IO_MAX;
io->hio = NULL;
io->transferred = 0;
io->efct = efct;
io->timeout = 0;
io->sgl_count = 0;
io->tgt_task_tag = 0;
io->init_task_tag = 0;
io->hw_tag = 0;
io->display_name = "pending";
io->seq_init = 0;
io->io_free = 0;
io->release = NULL;
atomic_add_return(1, &efct->xport->io_active_count);
atomic_add_return(1, &efct->xport->io_total_alloc);
return io;
}
/* Free an object used to track an IO */
void
efct_io_pool_io_free(struct efct_io_pool *io_pool, struct efct_io *io)
{
struct efct *efct;
struct efct_hw_io *hio = NULL;
unsigned long flags = 0;
efct = io_pool->efct;
spin_lock_irqsave(&io_pool->lock, flags);
hio = io->hio;
io->hio = NULL;
io->io_free = 1;
INIT_LIST_HEAD(&io->list_entry);
list_add(&io->list_entry, &io_pool->freelist);
spin_unlock_irqrestore(&io_pool->lock, flags);
if (hio)
efct_hw_io_free(&efct->hw, hio);
atomic_sub_return(1, &efct->xport->io_active_count);
atomic_add_return(1, &efct->xport->io_total_free);
}
/* Find an I/O given it's node and ox_id */
struct efct_io *
efct_io_find_tgt_io(struct efct *efct, struct efct_node *node,
u16 ox_id, u16 rx_id)
{
struct efct_io *io = NULL;
unsigned long flags = 0;
u8 found = false;
spin_lock_irqsave(&node->active_ios_lock, flags);
list_for_each_entry(io, &node->active_ios, list_entry) {
if ((io->cmd_tgt && io->init_task_tag == ox_id) &&
(rx_id == 0xffff || io->tgt_task_tag == rx_id)) {
if (kref_get_unless_zero(&io->ref))
found = true;
break;
}
}
spin_unlock_irqrestore(&node->active_ios_lock, flags);
return found ? io : NULL;
}
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