Merge tag 'for-v3.13-fixes' of git://git.infradead.org/battery-2.6

[mirror_ubuntu-jammy-kernel.git] / drivers / net / wireless / iwlwifi / pcie / rx.c

/******************************************************************************
 *
 * Copyright(c) 2003 - 2013 Intel Corporation. All rights reserved.
 *
 * Portions of this file are derived from the ipw3945 project, as well
 * as portions of the ieee80211 subsystem header files.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of version 2 of the GNU General Public License as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 * more details.
 *
 * You should have received a copy of the GNU General Public License along with
 * this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA
 *
 * The full GNU General Public License is included in this distribution in the
 * file called LICENSE.
 *
 * Contact Information:
 *  Intel Linux Wireless <ilw@linux.intel.com>
 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
 *
 *****************************************************************************/
#include <linux/sched.h>
#include <linux/wait.h>
#include <linux/gfp.h>

#include "iwl-prph.h"
#include "iwl-io.h"
#include "internal.h"
#include "iwl-op-mode.h"

/******************************************************************************
 *
 * RX path functions
 *
 ******************************************************************************/

/*
 * Rx theory of operation
 *
 * Driver allocates a circular buffer of Receive Buffer Descriptors (RBDs),
 * each of which point to Receive Buffers to be filled by the NIC.  These get
 * used not only for Rx frames, but for any command response or notification
 * from the NIC.  The driver and NIC manage the Rx buffers by means
 * of indexes into the circular buffer.
 *
 * Rx Queue Indexes
 * The host/firmware share two index registers for managing the Rx buffers.
 *
 * The READ index maps to the first position that the firmware may be writing
 * to -- the driver can read up to (but not including) this position and get
 * good data.
 * The READ index is managed by the firmware once the card is enabled.
 *
 * The WRITE index maps to the last position the driver has read from -- the
 * position preceding WRITE is the last slot the firmware can place a packet.
 *
 * The queue is empty (no good data) if WRITE = READ - 1, and is full if
 * WRITE = READ.
 *
 * During initialization, the host sets up the READ queue position to the first
 * INDEX position, and WRITE to the last (READ - 1 wrapped)
 *
 * When the firmware places a packet in a buffer, it will advance the READ index
 * and fire the RX interrupt.  The driver can then query the READ index and
 * process as many packets as possible, moving the WRITE index forward as it
 * resets the Rx queue buffers with new memory.
 *
 * The management in the driver is as follows:
 * + A list of pre-allocated SKBs is stored in iwl->rxq->rx_free.  When
 *   iwl->rxq->free_count drops to or below RX_LOW_WATERMARK, work is scheduled
 *   to replenish the iwl->rxq->rx_free.
 * + In iwl_pcie_rx_replenish (scheduled) if 'processed' != 'read' then the
 *   iwl->rxq is replenished and the READ INDEX is updated (updating the
 *   'processed' and 'read' driver indexes as well)
 * + A received packet is processed and handed to the kernel network stack,
 *   detached from the iwl->rxq.  The driver 'processed' index is updated.
 * + The Host/Firmware iwl->rxq is replenished at irq thread time from the
 *   rx_free list. If there are no allocated buffers in iwl->rxq->rx_free,
 *   the READ INDEX is not incremented and iwl->status(RX_STALLED) is set.
 *   If there were enough free buffers and RX_STALLED is set it is cleared.
 *
 *
 * Driver sequence:
 *
 * iwl_rxq_alloc()            Allocates rx_free
 * iwl_pcie_rx_replenish()    Replenishes rx_free list from rx_used, and calls
 *                            iwl_pcie_rxq_restock
 * iwl_pcie_rxq_restock()     Moves available buffers from rx_free into Rx
 *                            queue, updates firmware pointers, and updates
 *                            the WRITE index.  If insufficient rx_free buffers
 *                            are available, schedules iwl_pcie_rx_replenish
 *
 * -- enable interrupts --
 * ISR - iwl_rx()             Detach iwl_rx_mem_buffers from pool up to the
 *                            READ INDEX, detaching the SKB from the pool.
 *                            Moves the packet buffer from queue to rx_used.
 *                            Calls iwl_pcie_rxq_restock to refill any empty
 *                            slots.
 * ...
 *
 */

/*
 * iwl_rxq_space - Return number of free slots available in queue.
 */
static int iwl_rxq_space(const struct iwl_rxq *rxq)
{
        /* Make sure RX_QUEUE_SIZE is a power of 2 */
        BUILD_BUG_ON(RX_QUEUE_SIZE & (RX_QUEUE_SIZE - 1));

        /*
         * There can be up to (RX_QUEUE_SIZE - 1) free slots, to avoid ambiguity
         * between empty and completely full queues.
         * The following is equivalent to modulo by RX_QUEUE_SIZE and is well
         * defined for negative dividends.
         */
        return (rxq->read - rxq->write - 1) & (RX_QUEUE_SIZE - 1);
}

/*
 * iwl_dma_addr2rbd_ptr - convert a DMA address to a uCode read buffer ptr
 */
static inline __le32 iwl_pcie_dma_addr2rbd_ptr(dma_addr_t dma_addr)
{
        return cpu_to_le32((u32)(dma_addr >> 8));
}

/*
 * iwl_pcie_rx_stop - stops the Rx DMA
 */
int iwl_pcie_rx_stop(struct iwl_trans *trans)
{
        iwl_write_direct32(trans, FH_MEM_RCSR_CHNL0_CONFIG_REG, 0);
        return iwl_poll_direct_bit(trans, FH_MEM_RSSR_RX_STATUS_REG,
                                   FH_RSSR_CHNL0_RX_STATUS_CHNL_IDLE, 1000);
}

/*
 * iwl_pcie_rxq_inc_wr_ptr - Update the write pointer for the RX queue
 */
static void iwl_pcie_rxq_inc_wr_ptr(struct iwl_trans *trans,
                                    struct iwl_rxq *rxq)
{
        unsigned long flags;
        u32 reg;

        spin_lock_irqsave(&rxq->lock, flags);

        if (rxq->need_update == 0)
                goto exit_unlock;

        if (trans->cfg->base_params->shadow_reg_enable) {
                /* shadow register enabled */
                /* Device expects a multiple of 8 */
                rxq->write_actual = (rxq->write & ~0x7);
                iwl_write32(trans, FH_RSCSR_CHNL0_WPTR, rxq->write_actual);
        } else {
                struct iwl_trans_pcie *trans_pcie =
                        IWL_TRANS_GET_PCIE_TRANS(trans);

                /* If power-saving is in use, make sure device is awake */
                if (test_bit(STATUS_TPOWER_PMI, &trans_pcie->status)) {
                        reg = iwl_read32(trans, CSR_UCODE_DRV_GP1);

                        if (reg & CSR_UCODE_DRV_GP1_BIT_MAC_SLEEP) {
                                IWL_DEBUG_INFO(trans,
                                        "Rx queue requesting wakeup,"
                                        " GP1 = 0x%x\n", reg);
                                iwl_set_bit(trans, CSR_GP_CNTRL,
                                        CSR_GP_CNTRL_REG_FLAG_MAC_ACCESS_REQ);
                                goto exit_unlock;
                        }

                        rxq->write_actual = (rxq->write & ~0x7);
                        iwl_write_direct32(trans, FH_RSCSR_CHNL0_WPTR,
                                           rxq->write_actual);

                /* Else device is assumed to be awake */
                } else {
                        /* Device expects a multiple of 8 */
                        rxq->write_actual = (rxq->write & ~0x7);
                        iwl_write_direct32(trans, FH_RSCSR_CHNL0_WPTR,
                                           rxq->write_actual);
                }
        }
        rxq->need_update = 0;

 exit_unlock:
        spin_unlock_irqrestore(&rxq->lock, flags);
}

/*
 * iwl_pcie_rxq_restock - refill RX queue from pre-allocated pool
 *
 * If there are slots in the RX queue that need to be restocked,
 * and we have free pre-allocated buffers, fill the ranks as much
 * as we can, pulling from rx_free.
 *
 * This moves the 'write' index forward to catch up with 'processed', and
 * also updates the memory address in the firmware to reference the new
 * target buffer.
 */
static void iwl_pcie_rxq_restock(struct iwl_trans *trans)
{
        struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
        struct iwl_rxq *rxq = &trans_pcie->rxq;
        struct iwl_rx_mem_buffer *rxb;
        unsigned long flags;

        /*
         * If the device isn't enabled - not need to try to add buffers...
         * This can happen when we stop the device and still have an interrupt
         * pending. We stop the APM before we sync the interrupts because we
         * have to (see comment there). On the other hand, since the APM is
         * stopped, we cannot access the HW (in particular not prph).
         * So don't try to restock if the APM has been already stopped.
         */
        if (!test_bit(STATUS_DEVICE_ENABLED, &trans_pcie->status))
                return;

        spin_lock_irqsave(&rxq->lock, flags);
        while ((iwl_rxq_space(rxq) > 0) && (rxq->free_count)) {
                /* The overwritten rxb must be a used one */
                rxb = rxq->queue[rxq->write];
                BUG_ON(rxb && rxb->page);

                /* Get next free Rx buffer, remove from free list */
                rxb = list_first_entry(&rxq->rx_free, struct iwl_rx_mem_buffer,
                                       list);
                list_del(&rxb->list);

                /* Point to Rx buffer via next RBD in circular buffer */
                rxq->bd[rxq->write] = iwl_pcie_dma_addr2rbd_ptr(rxb->page_dma);
                rxq->queue[rxq->write] = rxb;
                rxq->write = (rxq->write + 1) & RX_QUEUE_MASK;
                rxq->free_count--;
        }
        spin_unlock_irqrestore(&rxq->lock, flags);
        /* If the pre-allocated buffer pool is dropping low, schedule to
         * refill it */
        if (rxq->free_count <= RX_LOW_WATERMARK)
                schedule_work(&trans_pcie->rx_replenish);

        /* If we've added more space for the firmware to place data, tell it.
         * Increment device's write pointer in multiples of 8. */
        if (rxq->write_actual != (rxq->write & ~0x7)) {
                spin_lock_irqsave(&rxq->lock, flags);
                rxq->need_update = 1;
                spin_unlock_irqrestore(&rxq->lock, flags);
                iwl_pcie_rxq_inc_wr_ptr(trans, rxq);
        }
}

/*
 * iwl_pcie_rxq_alloc_rbs - allocate a page for each used RBD
 *
 * A used RBD is an Rx buffer that has been given to the stack. To use it again
 * a page must be allocated and the RBD must point to the page. This function
 * doesn't change the HW pointer but handles the list of pages that is used by
 * iwl_pcie_rxq_restock. The latter function will update the HW to use the newly
 * allocated buffers.
 */
static void iwl_pcie_rxq_alloc_rbs(struct iwl_trans *trans, gfp_t priority)
{
        struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
        struct iwl_rxq *rxq = &trans_pcie->rxq;
        struct iwl_rx_mem_buffer *rxb;
        struct page *page;
        unsigned long flags;
        gfp_t gfp_mask = priority;

        while (1) {
                spin_lock_irqsave(&rxq->lock, flags);
                if (list_empty(&rxq->rx_used)) {
                        spin_unlock_irqrestore(&rxq->lock, flags);
                        return;
                }
                spin_unlock_irqrestore(&rxq->lock, flags);

                if (rxq->free_count > RX_LOW_WATERMARK)
                        gfp_mask |= __GFP_NOWARN;

                if (trans_pcie->rx_page_order > 0)
                        gfp_mask |= __GFP_COMP;

                /* Alloc a new receive buffer */
                page = alloc_pages(gfp_mask, trans_pcie->rx_page_order);
                if (!page) {
                        if (net_ratelimit())
                                IWL_DEBUG_INFO(trans, "alloc_pages failed, "
                                           "order: %d\n",
                                           trans_pcie->rx_page_order);

                        if ((rxq->free_count <= RX_LOW_WATERMARK) &&
                            net_ratelimit())
                                IWL_CRIT(trans, "Failed to alloc_pages with %s."
                                         "Only %u free buffers remaining.\n",
                                         priority == GFP_ATOMIC ?
                                         "GFP_ATOMIC" : "GFP_KERNEL",
                                         rxq->free_count);
                        /* We don't reschedule replenish work here -- we will
                         * call the restock method and if it still needs
                         * more buffers it will schedule replenish */
                        return;
                }

                spin_lock_irqsave(&rxq->lock, flags);

                if (list_empty(&rxq->rx_used)) {
                        spin_unlock_irqrestore(&rxq->lock, flags);
                        __free_pages(page, trans_pcie->rx_page_order);
                        return;
                }
                rxb = list_first_entry(&rxq->rx_used, struct iwl_rx_mem_buffer,
                                       list);
                list_del(&rxb->list);
                spin_unlock_irqrestore(&rxq->lock, flags);

                BUG_ON(rxb->page);
                rxb->page = page;
                /* Get physical address of the RB */
                rxb->page_dma =
                        dma_map_page(trans->dev, page, 0,
                                     PAGE_SIZE << trans_pcie->rx_page_order,
                                     DMA_FROM_DEVICE);
                if (dma_mapping_error(trans->dev, rxb->page_dma)) {
                        rxb->page = NULL;
                        spin_lock_irqsave(&rxq->lock, flags);
                        list_add(&rxb->list, &rxq->rx_used);
                        spin_unlock_irqrestore(&rxq->lock, flags);
                        __free_pages(page, trans_pcie->rx_page_order);
                        return;
                }
                /* dma address must be no more than 36 bits */
                BUG_ON(rxb->page_dma & ~DMA_BIT_MASK(36));
                /* and also 256 byte aligned! */
                BUG_ON(rxb->page_dma & DMA_BIT_MASK(8));

                spin_lock_irqsave(&rxq->lock, flags);

                list_add_tail(&rxb->list, &rxq->rx_free);
                rxq->free_count++;

                spin_unlock_irqrestore(&rxq->lock, flags);
        }
}

static void iwl_pcie_rxq_free_rbs(struct iwl_trans *trans)
{
        struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
        struct iwl_rxq *rxq = &trans_pcie->rxq;
        int i;

        lockdep_assert_held(&rxq->lock);

        for (i = 0; i < RX_FREE_BUFFERS + RX_QUEUE_SIZE; i++) {
                if (!rxq->pool[i].page)
                        continue;
                dma_unmap_page(trans->dev, rxq->pool[i].page_dma,
                               PAGE_SIZE << trans_pcie->rx_page_order,
                               DMA_FROM_DEVICE);
                __free_pages(rxq->pool[i].page, trans_pcie->rx_page_order);
                rxq->pool[i].page = NULL;
        }
}

/*
 * iwl_pcie_rx_replenish - Move all used buffers from rx_used to rx_free
 *
 * When moving to rx_free an page is allocated for the slot.
 *
 * Also restock the Rx queue via iwl_pcie_rxq_restock.
 * This is called as a scheduled work item (except for during initialization)
 */
static void iwl_pcie_rx_replenish(struct iwl_trans *trans)
{
        struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
        unsigned long flags;

        iwl_pcie_rxq_alloc_rbs(trans, GFP_KERNEL);

        spin_lock_irqsave(&trans_pcie->irq_lock, flags);
        iwl_pcie_rxq_restock(trans);
        spin_unlock_irqrestore(&trans_pcie->irq_lock, flags);
}

static void iwl_pcie_rx_replenish_now(struct iwl_trans *trans)
{
        iwl_pcie_rxq_alloc_rbs(trans, GFP_ATOMIC);

        iwl_pcie_rxq_restock(trans);
}

static void iwl_pcie_rx_replenish_work(struct work_struct *data)
{
        struct iwl_trans_pcie *trans_pcie =
            container_of(data, struct iwl_trans_pcie, rx_replenish);

        iwl_pcie_rx_replenish(trans_pcie->trans);
}

static int iwl_pcie_rx_alloc(struct iwl_trans *trans)
{
        struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
        struct iwl_rxq *rxq = &trans_pcie->rxq;
        struct device *dev = trans->dev;

        memset(&trans_pcie->rxq, 0, sizeof(trans_pcie->rxq));

        spin_lock_init(&rxq->lock);

        if (WARN_ON(rxq->bd || rxq->rb_stts))
                return -EINVAL;

        /* Allocate the circular buffer of Read Buffer Descriptors (RBDs) */
        rxq->bd = dma_zalloc_coherent(dev, sizeof(__le32) * RX_QUEUE_SIZE,
                                      &rxq->bd_dma, GFP_KERNEL);
        if (!rxq->bd)
                goto err_bd;

        /*Allocate the driver's pointer to receive buffer status */
        rxq->rb_stts = dma_zalloc_coherent(dev, sizeof(*rxq->rb_stts),
                                           &rxq->rb_stts_dma, GFP_KERNEL);
        if (!rxq->rb_stts)
                goto err_rb_stts;

        return 0;

err_rb_stts:
        dma_free_coherent(dev, sizeof(__le32) * RX_QUEUE_SIZE,
                          rxq->bd, rxq->bd_dma);
        rxq->bd_dma = 0;
        rxq->bd = NULL;
err_bd:
        return -ENOMEM;
}

static void iwl_pcie_rx_hw_init(struct iwl_trans *trans, struct iwl_rxq *rxq)
{
        struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
        u32 rb_size;
        const u32 rfdnlog = RX_QUEUE_SIZE_LOG; /* 256 RBDs */

        if (trans_pcie->rx_buf_size_8k)
                rb_size = FH_RCSR_RX_CONFIG_REG_VAL_RB_SIZE_8K;
        else
                rb_size = FH_RCSR_RX_CONFIG_REG_VAL_RB_SIZE_4K;

        /* Stop Rx DMA */
        iwl_write_direct32(trans, FH_MEM_RCSR_CHNL0_CONFIG_REG, 0);
        /* reset and flush pointers */
        iwl_write_direct32(trans, FH_MEM_RCSR_CHNL0_RBDCB_WPTR, 0);
        iwl_write_direct32(trans, FH_MEM_RCSR_CHNL0_FLUSH_RB_REQ, 0);
        iwl_write_direct32(trans, FH_RSCSR_CHNL0_RDPTR, 0);

        /* Reset driver's Rx queue write index */
        iwl_write_direct32(trans, FH_RSCSR_CHNL0_RBDCB_WPTR_REG, 0);

        /* Tell device where to find RBD circular buffer in DRAM */
        iwl_write_direct32(trans, FH_RSCSR_CHNL0_RBDCB_BASE_REG,
                           (u32)(rxq->bd_dma >> 8));

        /* Tell device where in DRAM to update its Rx status */
        iwl_write_direct32(trans, FH_RSCSR_CHNL0_STTS_WPTR_REG,
                           rxq->rb_stts_dma >> 4);

        /* Enable Rx DMA
         * FH_RCSR_CHNL0_RX_IGNORE_RXF_EMPTY is set because of HW bug in
         *      the credit mechanism in 5000 HW RX FIFO
         * Direct rx interrupts to hosts
         * Rx buffer size 4 or 8k
         * RB timeout 0x10
         * 256 RBDs
         */
        iwl_write_direct32(trans, FH_MEM_RCSR_CHNL0_CONFIG_REG,
                           FH_RCSR_RX_CONFIG_CHNL_EN_ENABLE_VAL |
                           FH_RCSR_CHNL0_RX_IGNORE_RXF_EMPTY |
                           FH_RCSR_CHNL0_RX_CONFIG_IRQ_DEST_INT_HOST_VAL |
                           rb_size|
                           (RX_RB_TIMEOUT << FH_RCSR_RX_CONFIG_REG_IRQ_RBTH_POS)|
                           (rfdnlog << FH_RCSR_RX_CONFIG_RBDCB_SIZE_POS));

        /* Set interrupt coalescing timer to default (2048 usecs) */
        iwl_write8(trans, CSR_INT_COALESCING, IWL_HOST_INT_TIMEOUT_DEF);

        /* W/A for interrupt coalescing bug in 7260 and 3160 */
        if (trans->cfg->host_interrupt_operation_mode)
                iwl_set_bit(trans, CSR_INT_COALESCING, IWL_HOST_INT_OPER_MODE);
}

static void iwl_pcie_rx_init_rxb_lists(struct iwl_rxq *rxq)
{
        int i;

        lockdep_assert_held(&rxq->lock);

        INIT_LIST_HEAD(&rxq->rx_free);
        INIT_LIST_HEAD(&rxq->rx_used);
        rxq->free_count = 0;

        for (i = 0; i < RX_FREE_BUFFERS + RX_QUEUE_SIZE; i++)
                list_add(&rxq->pool[i].list, &rxq->rx_used);
}

int iwl_pcie_rx_init(struct iwl_trans *trans)
{
        struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
        struct iwl_rxq *rxq = &trans_pcie->rxq;
        int i, err;
        unsigned long flags;

        if (!rxq->bd) {
                err = iwl_pcie_rx_alloc(trans);
                if (err)
                        return err;
        }

        spin_lock_irqsave(&rxq->lock, flags);

        INIT_WORK(&trans_pcie->rx_replenish, iwl_pcie_rx_replenish_work);

        /* free all first - we might be reconfigured for a different size */
        iwl_pcie_rxq_free_rbs(trans);
        iwl_pcie_rx_init_rxb_lists(rxq);

        for (i = 0; i < RX_QUEUE_SIZE; i++)
                rxq->queue[i] = NULL;

        /* Set us so that we have processed and used all buffers, but have
         * not restocked the Rx queue with fresh buffers */
        rxq->read = rxq->write = 0;
        rxq->write_actual = 0;
        memset(rxq->rb_stts, 0, sizeof(*rxq->rb_stts));
        spin_unlock_irqrestore(&rxq->lock, flags);

        iwl_pcie_rx_replenish(trans);

        iwl_pcie_rx_hw_init(trans, rxq);

        spin_lock_irqsave(&trans_pcie->irq_lock, flags);
        rxq->need_update = 1;
        iwl_pcie_rxq_inc_wr_ptr(trans, rxq);
        spin_unlock_irqrestore(&trans_pcie->irq_lock, flags);

        return 0;
}

void iwl_pcie_rx_free(struct iwl_trans *trans)
{
        struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
        struct iwl_rxq *rxq = &trans_pcie->rxq;
        unsigned long flags;

        /*if rxq->bd is NULL, it means that nothing has been allocated,
         * exit now */
        if (!rxq->bd) {
                IWL_DEBUG_INFO(trans, "Free NULL rx context\n");
                return;
        }

        cancel_work_sync(&trans_pcie->rx_replenish);

        spin_lock_irqsave(&rxq->lock, flags);
        iwl_pcie_rxq_free_rbs(trans);
        spin_unlock_irqrestore(&rxq->lock, flags);

        dma_free_coherent(trans->dev, sizeof(__le32) * RX_QUEUE_SIZE,
                          rxq->bd, rxq->bd_dma);
        rxq->bd_dma = 0;
        rxq->bd = NULL;

        if (rxq->rb_stts)
                dma_free_coherent(trans->dev,
                                  sizeof(struct iwl_rb_status),
                                  rxq->rb_stts, rxq->rb_stts_dma);
        else
                IWL_DEBUG_INFO(trans, "Free rxq->rb_stts which is NULL\n");
        rxq->rb_stts_dma = 0;
        rxq->rb_stts = NULL;
}

static void iwl_pcie_rx_handle_rb(struct iwl_trans *trans,
                                struct iwl_rx_mem_buffer *rxb)
{
        struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
        struct iwl_rxq *rxq = &trans_pcie->rxq;
        struct iwl_txq *txq = &trans_pcie->txq[trans_pcie->cmd_queue];
        unsigned long flags;
        bool page_stolen = false;
        int max_len = PAGE_SIZE << trans_pcie->rx_page_order;
        u32 offset = 0;

        if (WARN_ON(!rxb))
                return;

        dma_unmap_page(trans->dev, rxb->page_dma, max_len, DMA_FROM_DEVICE);

        while (offset + sizeof(u32) + sizeof(struct iwl_cmd_header) < max_len) {
                struct iwl_rx_packet *pkt;
                struct iwl_device_cmd *cmd;
                u16 sequence;
                bool reclaim;
                int index, cmd_index, err, len;
                struct iwl_rx_cmd_buffer rxcb = {
                        ._offset = offset,
                        ._rx_page_order = trans_pcie->rx_page_order,
                        ._page = rxb->page,
                        ._page_stolen = false,
                        .truesize = max_len,
                };

                pkt = rxb_addr(&rxcb);

                if (pkt->len_n_flags == cpu_to_le32(FH_RSCSR_FRAME_INVALID))
                        break;

                IWL_DEBUG_RX(trans, "cmd at offset %d: %s (0x%.2x)\n",
                        rxcb._offset, get_cmd_string(trans_pcie, pkt->hdr.cmd),
                        pkt->hdr.cmd);

                len = le32_to_cpu(pkt->len_n_flags) & FH_RSCSR_FRAME_SIZE_MSK;
                len += sizeof(u32); /* account for status word */
                trace_iwlwifi_dev_rx(trans->dev, trans, pkt, len);
                trace_iwlwifi_dev_rx_data(trans->dev, trans, pkt, len);

                /* Reclaim a command buffer only if this packet is a response
                 *   to a (driver-originated) command.
                 * If the packet (e.g. Rx frame) originated from uCode,
                 *   there is no command buffer to reclaim.
                 * Ucode should set SEQ_RX_FRAME bit if ucode-originated,
                 *   but apparently a few don't get set; catch them here. */
                reclaim = !(pkt->hdr.sequence & SEQ_RX_FRAME);
                if (reclaim) {
                        int i;

                        for (i = 0; i < trans_pcie->n_no_reclaim_cmds; i++) {
                                if (trans_pcie->no_reclaim_cmds[i] ==
                                                        pkt->hdr.cmd) {
                                        reclaim = false;
                                        break;
                                }
                        }
                }

                sequence = le16_to_cpu(pkt->hdr.sequence);
                index = SEQ_TO_INDEX(sequence);
                cmd_index = get_cmd_index(&txq->q, index);

                if (reclaim)
                        cmd = txq->entries[cmd_index].cmd;
                else
                        cmd = NULL;

                err = iwl_op_mode_rx(trans->op_mode, &rxcb, cmd);

                if (reclaim) {
                        kfree(txq->entries[cmd_index].free_buf);
                        txq->entries[cmd_index].free_buf = NULL;
                }

                /*
                 * After here, we should always check rxcb._page_stolen,
                 * if it is true then one of the handlers took the page.
                 */

                if (reclaim) {
                        /* Invoke any callbacks, transfer the buffer to caller,
                         * and fire off the (possibly) blocking
                         * iwl_trans_send_cmd()
                         * as we reclaim the driver command queue */
                        if (!rxcb._page_stolen)
                                iwl_pcie_hcmd_complete(trans, &rxcb, err);
                        else
                                IWL_WARN(trans, "Claim null rxb?\n");
                }

                page_stolen |= rxcb._page_stolen;
                offset += ALIGN(len, FH_RSCSR_FRAME_ALIGN);
        }

        /* page was stolen from us -- free our reference */
        if (page_stolen) {
                __free_pages(rxb->page, trans_pcie->rx_page_order);
                rxb->page = NULL;
        }

        /* Reuse the page if possible. For notification packets and
         * SKBs that fail to Rx correctly, add them back into the
         * rx_free list for reuse later. */
        spin_lock_irqsave(&rxq->lock, flags);
        if (rxb->page != NULL) {
                rxb->page_dma =
                        dma_map_page(trans->dev, rxb->page, 0,
                                     PAGE_SIZE << trans_pcie->rx_page_order,
                                     DMA_FROM_DEVICE);
                if (dma_mapping_error(trans->dev, rxb->page_dma)) {
                        /*
                         * free the page(s) as well to not break
                         * the invariant that the items on the used
                         * list have no page(s)
                         */
                        __free_pages(rxb->page, trans_pcie->rx_page_order);
                        rxb->page = NULL;
                        list_add_tail(&rxb->list, &rxq->rx_used);
                } else {
                        list_add_tail(&rxb->list, &rxq->rx_free);
                        rxq->free_count++;
                }
        } else
                list_add_tail(&rxb->list, &rxq->rx_used);
        spin_unlock_irqrestore(&rxq->lock, flags);
}

/*
 * iwl_pcie_rx_handle - Main entry function for receiving responses from fw
 */
static void iwl_pcie_rx_handle(struct iwl_trans *trans)
{
        struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
        struct iwl_rxq *rxq = &trans_pcie->rxq;
        u32 r, i;
        u8 fill_rx = 0;
        u32 count = 8;
        int total_empty;

        /* uCode's read index (stored in shared DRAM) indicates the last Rx
         * buffer that the driver may process (last buffer filled by ucode). */
        r = le16_to_cpu(ACCESS_ONCE(rxq->rb_stts->closed_rb_num)) & 0x0FFF;
        i = rxq->read;

        /* Rx interrupt, but nothing sent from uCode */
        if (i == r)
                IWL_DEBUG_RX(trans, "HW = SW = %d\n", r);

        /* calculate total frames need to be restock after handling RX */
        total_empty = r - rxq->write_actual;
        if (total_empty < 0)
                total_empty += RX_QUEUE_SIZE;

        if (total_empty > (RX_QUEUE_SIZE / 2))
                fill_rx = 1;

        while (i != r) {
                struct iwl_rx_mem_buffer *rxb;

                rxb = rxq->queue[i];
                rxq->queue[i] = NULL;

                IWL_DEBUG_RX(trans, "rxbuf: HW = %d, SW = %d (%p)\n",
                             r, i, rxb);
                iwl_pcie_rx_handle_rb(trans, rxb);

                i = (i + 1) & RX_QUEUE_MASK;
                /* If there are a lot of unused frames,
                 * restock the Rx queue so ucode wont assert. */
                if (fill_rx) {
                        count++;
                        if (count >= 8) {
                                rxq->read = i;
                                iwl_pcie_rx_replenish_now(trans);
                                count = 0;
                        }
                }
        }

        /* Backtrack one entry */
        rxq->read = i;
        if (fill_rx)
                iwl_pcie_rx_replenish_now(trans);
        else
                iwl_pcie_rxq_restock(trans);
}

/*
 * iwl_pcie_irq_handle_error - called for HW or SW error interrupt from card
 */
static void iwl_pcie_irq_handle_error(struct iwl_trans *trans)
{
        struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);

        /* W/A for WiFi/WiMAX coex and WiMAX own the RF */
        if (trans->cfg->internal_wimax_coex &&
            (!(iwl_read_prph(trans, APMG_CLK_CTRL_REG) &
                             APMS_CLK_VAL_MRB_FUNC_MODE) ||
             (iwl_read_prph(trans, APMG_PS_CTRL_REG) &
                            APMG_PS_CTRL_VAL_RESET_REQ))) {
                clear_bit(STATUS_HCMD_ACTIVE, &trans_pcie->status);
                iwl_op_mode_wimax_active(trans->op_mode);
                wake_up(&trans_pcie->wait_command_queue);
                return;
        }

        iwl_pcie_dump_csr(trans);
        iwl_dump_fh(trans, NULL);

        /* set the ERROR bit before we wake up the caller */
        set_bit(STATUS_FW_ERROR, &trans_pcie->status);
        clear_bit(STATUS_HCMD_ACTIVE, &trans_pcie->status);
        wake_up(&trans_pcie->wait_command_queue);

        local_bh_disable();
        iwl_nic_error(trans);
        local_bh_enable();
}

irqreturn_t iwl_pcie_irq_handler(int irq, void *dev_id)
{
        struct iwl_trans *trans = dev_id;
        struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
        struct isr_statistics *isr_stats = &trans_pcie->isr_stats;
        u32 inta = 0;
        u32 handled = 0;
        unsigned long flags;
        u32 i;

        lock_map_acquire(&trans->sync_cmd_lockdep_map);

        spin_lock_irqsave(&trans_pcie->irq_lock, flags);

        /* Ack/clear/reset pending uCode interrupts.
         * Note:  Some bits in CSR_INT are "OR" of bits in CSR_FH_INT_STATUS,
         */
        /* There is a hardware bug in the interrupt mask function that some
         * interrupts (i.e. CSR_INT_BIT_SCD) can still be generated even if
         * they are disabled in the CSR_INT_MASK register. Furthermore the
         * ICT interrupt handling mechanism has another bug that might cause
         * these unmasked interrupts fail to be detected. We workaround the
         * hardware bugs here by ACKing all the possible interrupts so that
         * interrupt coalescing can still be achieved.
         */
        iwl_write32(trans, CSR_INT,
                    trans_pcie->inta | ~trans_pcie->inta_mask);

        inta = trans_pcie->inta;

        if (iwl_have_debug_level(IWL_DL_ISR))
                IWL_DEBUG_ISR(trans, "inta 0x%08x, enabled 0x%08x\n",
                              inta, iwl_read32(trans, CSR_INT_MASK));

        /* saved interrupt in inta variable now we can reset trans_pcie->inta */
        trans_pcie->inta = 0;

        spin_unlock_irqrestore(&trans_pcie->irq_lock, flags);

        /* Now service all interrupt bits discovered above. */
        if (inta & CSR_INT_BIT_HW_ERR) {
                IWL_ERR(trans, "Hardware error detected.  Restarting.\n");

                /* Tell the device to stop sending interrupts */
                iwl_disable_interrupts(trans);

                isr_stats->hw++;
                iwl_pcie_irq_handle_error(trans);

                handled |= CSR_INT_BIT_HW_ERR;

                goto out;
        }

        if (iwl_have_debug_level(IWL_DL_ISR)) {
                /* NIC fires this, but we don't use it, redundant with WAKEUP */
                if (inta & CSR_INT_BIT_SCD) {
                        IWL_DEBUG_ISR(trans,
                                      "Scheduler finished to transmit the frame/frames.\n");
                        isr_stats->sch++;
                }

                /* Alive notification via Rx interrupt will do the real work */
                if (inta & CSR_INT_BIT_ALIVE) {
                        IWL_DEBUG_ISR(trans, "Alive interrupt\n");
                        isr_stats->alive++;
                }
        }

        /* Safely ignore these bits for debug checks below */
        inta &= ~(CSR_INT_BIT_SCD | CSR_INT_BIT_ALIVE);

        /* HW RF KILL switch toggled */
        if (inta & CSR_INT_BIT_RF_KILL) {
                bool hw_rfkill;

                hw_rfkill = iwl_is_rfkill_set(trans);
                IWL_WARN(trans, "RF_KILL bit toggled to %s.\n",
                         hw_rfkill ? "disable radio" : "enable radio");

                isr_stats->rfkill++;

                iwl_op_mode_hw_rf_kill(trans->op_mode, hw_rfkill);
                if (hw_rfkill) {
                        set_bit(STATUS_RFKILL, &trans_pcie->status);
                        if (test_and_clear_bit(STATUS_HCMD_ACTIVE,
                                               &trans_pcie->status))
                                IWL_DEBUG_RF_KILL(trans,
                                                  "Rfkill while SYNC HCMD in flight\n");
                        wake_up(&trans_pcie->wait_command_queue);
                } else {
                        clear_bit(STATUS_RFKILL, &trans_pcie->status);
                }

                handled |= CSR_INT_BIT_RF_KILL;
        }

        /* Chip got too hot and stopped itself */
        if (inta & CSR_INT_BIT_CT_KILL) {
                IWL_ERR(trans, "Microcode CT kill error detected.\n");
                isr_stats->ctkill++;
                handled |= CSR_INT_BIT_CT_KILL;
        }

        /* Error detected by uCode */
        if (inta & CSR_INT_BIT_SW_ERR) {
                IWL_ERR(trans, "Microcode SW error detected. "
                        " Restarting 0x%X.\n", inta);
                isr_stats->sw++;
                iwl_pcie_irq_handle_error(trans);
                handled |= CSR_INT_BIT_SW_ERR;
        }

        /* uCode wakes up after power-down sleep */
        if (inta & CSR_INT_BIT_WAKEUP) {
                IWL_DEBUG_ISR(trans, "Wakeup interrupt\n");
                iwl_pcie_rxq_inc_wr_ptr(trans, &trans_pcie->rxq);
                for (i = 0; i < trans->cfg->base_params->num_of_queues; i++)
                        iwl_pcie_txq_inc_wr_ptr(trans, &trans_pcie->txq[i]);

                isr_stats->wakeup++;

                handled |= CSR_INT_BIT_WAKEUP;
        }

        /* All uCode command responses, including Tx command responses,
         * Rx "responses" (frame-received notification), and other
         * notifications from uCode come through here*/
        if (inta & (CSR_INT_BIT_FH_RX | CSR_INT_BIT_SW_RX |
                    CSR_INT_BIT_RX_PERIODIC)) {
                IWL_DEBUG_ISR(trans, "Rx interrupt\n");
                if (inta & (CSR_INT_BIT_FH_RX | CSR_INT_BIT_SW_RX)) {
                        handled |= (CSR_INT_BIT_FH_RX | CSR_INT_BIT_SW_RX);
                        iwl_write32(trans, CSR_FH_INT_STATUS,
                                        CSR_FH_INT_RX_MASK);
                }
                if (inta & CSR_INT_BIT_RX_PERIODIC) {
                        handled |= CSR_INT_BIT_RX_PERIODIC;
                        iwl_write32(trans,
                                CSR_INT, CSR_INT_BIT_RX_PERIODIC);
                }
                /* Sending RX interrupt require many steps to be done in the
                 * the device:
                 * 1- write interrupt to current index in ICT table.
                 * 2- dma RX frame.
                 * 3- update RX shared data to indicate last write index.
                 * 4- send interrupt.
                 * This could lead to RX race, driver could receive RX interrupt
                 * but the shared data changes does not reflect this;
                 * periodic interrupt will detect any dangling Rx activity.
                 */

                /* Disable periodic interrupt; we use it as just a one-shot. */
                iwl_write8(trans, CSR_INT_PERIODIC_REG,
                            CSR_INT_PERIODIC_DIS);

                iwl_pcie_rx_handle(trans);

                /*
                 * Enable periodic interrupt in 8 msec only if we received
                 * real RX interrupt (instead of just periodic int), to catch
                 * any dangling Rx interrupt.  If it was just the periodic
                 * interrupt, there was no dangling Rx activity, and no need
                 * to extend the periodic interrupt; one-shot is enough.
                 */
                if (inta & (CSR_INT_BIT_FH_RX | CSR_INT_BIT_SW_RX))
                        iwl_write8(trans, CSR_INT_PERIODIC_REG,
                                   CSR_INT_PERIODIC_ENA);

                isr_stats->rx++;
        }

        /* This "Tx" DMA channel is used only for loading uCode */
        if (inta & CSR_INT_BIT_FH_TX) {
                iwl_write32(trans, CSR_FH_INT_STATUS, CSR_FH_INT_TX_MASK);
                IWL_DEBUG_ISR(trans, "uCode load interrupt\n");
                isr_stats->tx++;
                handled |= CSR_INT_BIT_FH_TX;
                /* Wake up uCode load routine, now that load is complete */
                trans_pcie->ucode_write_complete = true;
                wake_up(&trans_pcie->ucode_write_waitq);
        }

        if (inta & ~handled) {
                IWL_ERR(trans, "Unhandled INTA bits 0x%08x\n", inta & ~handled);
                isr_stats->unhandled++;
        }

        if (inta & ~(trans_pcie->inta_mask)) {
                IWL_WARN(trans, "Disabled INTA bits 0x%08x were pending\n",
                         inta & ~trans_pcie->inta_mask);
        }

        /* Re-enable all interrupts */
        /* only Re-enable if disabled by irq */
        if (test_bit(STATUS_INT_ENABLED, &trans_pcie->status))
                iwl_enable_interrupts(trans);
        /* Re-enable RF_KILL if it occurred */
        else if (handled & CSR_INT_BIT_RF_KILL)
                iwl_enable_rfkill_int(trans);

out:
        lock_map_release(&trans->sync_cmd_lockdep_map);
        return IRQ_HANDLED;
}

/******************************************************************************
 *
 * ICT functions
 *
 ******************************************************************************/

/* a device (PCI-E) page is 4096 bytes long */
#define ICT_SHIFT       12
#define ICT_SIZE        (1 << ICT_SHIFT)
#define ICT_COUNT       (ICT_SIZE / sizeof(u32))

/* Free dram table */
void iwl_pcie_free_ict(struct iwl_trans *trans)
{
        struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);

        if (trans_pcie->ict_tbl) {
                dma_free_coherent(trans->dev, ICT_SIZE,
                                  trans_pcie->ict_tbl,
                                  trans_pcie->ict_tbl_dma);
                trans_pcie->ict_tbl = NULL;
                trans_pcie->ict_tbl_dma = 0;
        }
}

/*
 * allocate dram shared table, it is an aligned memory
 * block of ICT_SIZE.
 * also reset all data related to ICT table interrupt.
 */
int iwl_pcie_alloc_ict(struct iwl_trans *trans)
{
        struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);

        trans_pcie->ict_tbl =
                dma_alloc_coherent(trans->dev, ICT_SIZE,
                                   &trans_pcie->ict_tbl_dma,
                                   GFP_KERNEL);
        if (!trans_pcie->ict_tbl)
                return -ENOMEM;

        /* just an API sanity check ... it is guaranteed to be aligned */
        if (WARN_ON(trans_pcie->ict_tbl_dma & (ICT_SIZE - 1))) {
                iwl_pcie_free_ict(trans);
                return -EINVAL;
        }

        IWL_DEBUG_ISR(trans, "ict dma addr %Lx\n",
                      (unsigned long long)trans_pcie->ict_tbl_dma);

        IWL_DEBUG_ISR(trans, "ict vir addr %p\n", trans_pcie->ict_tbl);

        /* reset table and index to all 0 */
        memset(trans_pcie->ict_tbl, 0, ICT_SIZE);
        trans_pcie->ict_index = 0;

        /* add periodic RX interrupt */
        trans_pcie->inta_mask |= CSR_INT_BIT_RX_PERIODIC;
        return 0;
}

/* Device is going up inform it about using ICT interrupt table,
 * also we need to tell the driver to start using ICT interrupt.
 */
void iwl_pcie_reset_ict(struct iwl_trans *trans)
{
        struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
        u32 val;
        unsigned long flags;

        if (!trans_pcie->ict_tbl)
                return;

        spin_lock_irqsave(&trans_pcie->irq_lock, flags);
        iwl_disable_interrupts(trans);

        memset(trans_pcie->ict_tbl, 0, ICT_SIZE);

        val = trans_pcie->ict_tbl_dma >> ICT_SHIFT;

        val |= CSR_DRAM_INT_TBL_ENABLE;
        val |= CSR_DRAM_INIT_TBL_WRAP_CHECK;

        IWL_DEBUG_ISR(trans, "CSR_DRAM_INT_TBL_REG =0x%x\n", val);

        iwl_write32(trans, CSR_DRAM_INT_TBL_REG, val);
        trans_pcie->use_ict = true;
        trans_pcie->ict_index = 0;
        iwl_write32(trans, CSR_INT, trans_pcie->inta_mask);
        iwl_enable_interrupts(trans);
        spin_unlock_irqrestore(&trans_pcie->irq_lock, flags);
}

/* Device is going down disable ict interrupt usage */
void iwl_pcie_disable_ict(struct iwl_trans *trans)
{
        struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
        unsigned long flags;

        spin_lock_irqsave(&trans_pcie->irq_lock, flags);
        trans_pcie->use_ict = false;
        spin_unlock_irqrestore(&trans_pcie->irq_lock, flags);
}

/* legacy (non-ICT) ISR. Assumes that trans_pcie->irq_lock is held */
static irqreturn_t iwl_pcie_isr(int irq, void *data)
{
        struct iwl_trans *trans = data;
        struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
        u32 inta, inta_mask;
        irqreturn_t ret = IRQ_NONE;

        lockdep_assert_held(&trans_pcie->irq_lock);

        trace_iwlwifi_dev_irq(trans->dev);

        /* Disable (but don't clear!) interrupts here to avoid
         *    back-to-back ISRs and sporadic interrupts from our NIC.
         * If we have something to service, the irq thread will re-enable ints.
         * If we *don't* have something, we'll re-enable before leaving here. */
        inta_mask = iwl_read32(trans, CSR_INT_MASK);
        iwl_write32(trans, CSR_INT_MASK, 0x00000000);

        /* Discover which interrupts are active/pending */
        inta = iwl_read32(trans, CSR_INT);

        if (inta & (~inta_mask)) {
                IWL_DEBUG_ISR(trans,
                              "We got a masked interrupt (0x%08x)...Ack and ignore\n",
                              inta & (~inta_mask));
                iwl_write32(trans, CSR_INT, inta & (~inta_mask));
                inta &= inta_mask;
        }

        /* Ignore interrupt if there's nothing in NIC to service.
         * This may be due to IRQ shared with another device,
         * or due to sporadic interrupts thrown from our NIC. */
        if (!inta) {
                IWL_DEBUG_ISR(trans, "Ignore interrupt, inta == 0\n");
                goto none;
        }

        if ((inta == 0xFFFFFFFF) || ((inta & 0xFFFFFFF0) == 0xa5a5a5a0)) {
                /* Hardware disappeared. It might have already raised
                 * an interrupt */
                IWL_WARN(trans, "HARDWARE GONE?? INTA == 0x%08x\n", inta);
                return IRQ_HANDLED;
        }

        if (iwl_have_debug_level(IWL_DL_ISR))
                IWL_DEBUG_ISR(trans,
                              "ISR inta 0x%08x, enabled 0x%08x, fh 0x%08x\n",
                              inta, inta_mask,
                              iwl_read32(trans, CSR_FH_INT_STATUS));

        trans_pcie->inta |= inta;
        /* the thread will service interrupts and re-enable them */
        if (likely(inta))
                return IRQ_WAKE_THREAD;

        ret = IRQ_HANDLED;

none:
        /* re-enable interrupts here since we don't have anything to service. */
        /* only Re-enable if disabled by irq  and no schedules tasklet. */
        if (test_bit(STATUS_INT_ENABLED, &trans_pcie->status) &&
            !trans_pcie->inta)
                iwl_enable_interrupts(trans);

        return ret;
}

/* interrupt handler using ict table, with this interrupt driver will
 * stop using INTA register to get device's interrupt, reading this register
 * is expensive, device will write interrupts in ICT dram table, increment
 * index then will fire interrupt to driver, driver will OR all ICT table
 * entries from current index up to table entry with 0 value. the result is
 * the interrupt we need to service, driver will set the entries back to 0 and
 * set index.
 */
irqreturn_t iwl_pcie_isr_ict(int irq, void *data)
{
        struct iwl_trans *trans = data;
        struct iwl_trans_pcie *trans_pcie;
        u32 inta;
        u32 val = 0;
        u32 read;
        unsigned long flags;
        irqreturn_t ret = IRQ_NONE;

        if (!trans)
                return IRQ_NONE;

        trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);

        spin_lock_irqsave(&trans_pcie->irq_lock, flags);

        /* dram interrupt table not set yet,
         * use legacy interrupt.
         */
        if (unlikely(!trans_pcie->use_ict)) {
                ret = iwl_pcie_isr(irq, data);
                spin_unlock_irqrestore(&trans_pcie->irq_lock, flags);
                return ret;
        }

        trace_iwlwifi_dev_irq(trans->dev);

        /* Disable (but don't clear!) interrupts here to avoid
         * back-to-back ISRs and sporadic interrupts from our NIC.
         * If we have something to service, the tasklet will re-enable ints.
         * If we *don't* have something, we'll re-enable before leaving here.
         */
        iwl_write32(trans, CSR_INT_MASK, 0x00000000);

        /* Ignore interrupt if there's nothing in NIC to service.
         * This may be due to IRQ shared with another device,
         * or due to sporadic interrupts thrown from our NIC. */
        read = le32_to_cpu(trans_pcie->ict_tbl[trans_pcie->ict_index]);
        trace_iwlwifi_dev_ict_read(trans->dev, trans_pcie->ict_index, read);
        if (!read) {
                IWL_DEBUG_ISR(trans, "Ignore interrupt, inta == 0\n");
                goto none;
        }

        /*
         * Collect all entries up to the first 0, starting from ict_index;
         * note we already read at ict_index.
         */
        do {
                val |= read;
                IWL_DEBUG_ISR(trans, "ICT index %d value 0x%08X\n",
                                trans_pcie->ict_index, read);
                trans_pcie->ict_tbl[trans_pcie->ict_index] = 0;
                trans_pcie->ict_index =
                        iwl_queue_inc_wrap(trans_pcie->ict_index, ICT_COUNT);

                read = le32_to_cpu(trans_pcie->ict_tbl[trans_pcie->ict_index]);
                trace_iwlwifi_dev_ict_read(trans->dev, trans_pcie->ict_index,
                                           read);
        } while (read);

        /* We should not get this value, just ignore it. */
        if (val == 0xffffffff)
                val = 0;

        /*
         * this is a w/a for a h/w bug. the h/w bug may cause the Rx bit
         * (bit 15 before shifting it to 31) to clear when using interrupt
         * coalescing. fortunately, bits 18 and 19 stay set when this happens
         * so we use them to decide on the real state of the Rx bit.
         * In order words, bit 15 is set if bit 18 or bit 19 are set.
         */
        if (val & 0xC0000)
                val |= 0x8000;

        inta = (0xff & val) | ((0xff00 & val) << 16);
        IWL_DEBUG_ISR(trans, "ISR inta 0x%08x, enabled(sw) 0x%08x ict 0x%08x\n",
                      inta, trans_pcie->inta_mask, val);
        if (iwl_have_debug_level(IWL_DL_ISR))
                IWL_DEBUG_ISR(trans, "enabled(hw) 0x%08x\n",
                              iwl_read32(trans, CSR_INT_MASK));

        inta &= trans_pcie->inta_mask;
        trans_pcie->inta |= inta;

        /* iwl_pcie_tasklet() will service interrupts and re-enable them */
        if (likely(inta)) {
                spin_unlock_irqrestore(&trans_pcie->irq_lock, flags);
                return IRQ_WAKE_THREAD;
        }

        ret = IRQ_HANDLED;

 none:
        /* re-enable interrupts here since we don't have anything to service.
         * only Re-enable if disabled by irq.
         */
        if (test_bit(STATUS_INT_ENABLED, &trans_pcie->status) &&
            !trans_pcie->inta)
                iwl_enable_interrupts(trans);

        spin_unlock_irqrestore(&trans_pcie->irq_lock, flags);
        return ret;
}