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];
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 = iwl_rx_packet_len(pkt);
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) {
kzfree(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. */
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);
}
/*
* 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;
restart:
spin_lock(&rxq->lock);
/* 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;
spin_unlock(&rxq->lock);
iwl_pcie_rx_replenish(trans, GFP_ATOMIC);
count = 0;
goto restart;
}
}
}
/* Backtrack one entry */
rxq->read = i;
spin_unlock(&rxq->lock);
if (fill_rx)
iwl_pcie_rx_replenish(trans, GFP_ATOMIC);
else
iwl_pcie_rxq_restock(trans);
if (trans_pcie->napi.poll)
napi_gro_flush(&trans_pcie->napi, false);
}
/*
* 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_SYNC_HCMD_ACTIVE, &trans->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);
local_bh_disable();
/* The STATUS_FW_ERROR bit is set in this function. This must happen
* before we wake up the command caller, to ensure a proper cleanup. */
iwl_trans_fw_error(trans);
local_bh_enable();
clear_bit(STATUS_SYNC_HCMD_ACTIVE, &trans->status);
wake_up(&trans_pcie->wait_command_queue);
}
static u32 iwl_pcie_int_cause_non_ict(struct iwl_trans *trans)
{
u32 inta;
lockdep_assert_held(&IWL_TRANS_GET_PCIE_TRANS(trans)->irq_lock);
trace_iwlwifi_dev_irq(trans->dev);
/* Discover which interrupts are active/pending */
inta = iwl_read32(trans, CSR_INT);
/* the thread will service interrupts and re-enable them */
return inta;
}
static void iwl_pcie_rx_handle_rb(struct iwl_trans *trans,
struct iwl_rx_mem_buffer *rxb,
bool emergency)
{
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];
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;
u16 sequence;
bool reclaim;
int index, cmd_index, 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, seq 0x%x)\n",
rxcb._offset,
iwl_get_cmd_string(trans,
iwl_cmd_id(pkt->hdr.cmd,
pkt->hdr.group_id,
0)),
pkt->hdr.cmd, le16_to_cpu(pkt->hdr.sequence));
len = iwl_rx_packet_len(pkt);
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);
iwl_op_mode_rx(trans->op_mode, &trans_pcie->napi, &rxcb);
if (reclaim) {
kzfree(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);
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. */
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;
iwl_pcie_rx_reuse_rbd(trans, rxb, rxq, emergency);
} else {
list_add_tail(&rxb->list, &rxq->rx_free);
rxq->free_count++;
}
} else
iwl_pcie_rx_reuse_rbd(trans, rxb, rxq, emergency);
}
/*
* 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, j, count = 0;
bool emergency = false;
restart:
spin_lock(&rxq->lock);
/* 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);
while (i != r) {
struct iwl_rx_mem_buffer *rxb;
if (unlikely(rxq->used_count == RX_QUEUE_SIZE / 2))
emergency = true;
rxb = rxq->queue[i];
rxq->queue[i] = NULL;
IWL_DEBUG_RX(trans, "rxbuf: HW = %d, SW = %d\n", r, i);
iwl_pcie_rx_handle_rb(trans, rxb, emergency);
i = (i + 1) & RX_QUEUE_MASK;
/* If we have RX_CLAIM_REQ_ALLOC released rx buffers -
* try to claim the pre-allocated buffers from the allocator */
if (rxq->used_count >= RX_CLAIM_REQ_ALLOC) {
struct iwl_rb_allocator *rba = &trans_pcie->rba;
struct iwl_rx_mem_buffer *out[RX_CLAIM_REQ_ALLOC];
if (rxq->used_count % RX_CLAIM_REQ_ALLOC == 0 &&
!emergency) {
/* Add the remaining 6 empty RBDs
* for allocator use
*/
spin_lock(&rba->lock);
list_splice_tail_init(&rxq->rx_used,
&rba->rbd_empty);
spin_unlock(&rba->lock);
}
/* If not ready - continue, will try to reclaim later.
* No need to reschedule work - allocator exits only on
* success */
if (!iwl_pcie_rx_allocator_get(trans, out)) {
/* If success - then RX_CLAIM_REQ_ALLOC
* buffers were retrieved and should be added
* to free list */
rxq->used_count -= RX_CLAIM_REQ_ALLOC;
for (j = 0; j < RX_CLAIM_REQ_ALLOC; j++) {
list_add_tail(&out[j]->list,
&rxq->rx_free);
rxq->free_count++;
}
}
}
if (emergency) {
count++;
if (count == 8) {
count = 0;
if (rxq->used_count < RX_QUEUE_SIZE / 3)
emergency = false;
spin_unlock(&rxq->lock);
iwl_pcie_rxq_alloc_rbs(trans, GFP_ATOMIC);
spin_lock(&rxq->lock);
}
}
/* handle restock for three cases, can be all of them at once:
* - we just pulled buffers from the allocator
* - we have 8+ unstolen pages accumulated
* - we are in emergency and allocated buffers
*/
if (rxq->free_count >= RX_CLAIM_REQ_ALLOC) {
rxq->read = i;
spin_unlock(&rxq->lock);
iwl_pcie_rxq_restock(trans);
goto restart;
}
}
/* Backtrack one entry */
rxq->read = i;
spin_unlock(&rxq->lock);
/*
* handle a case where in emergency there are some unallocated RBDs.
* those RBDs are in the used list, but are not tracked by the queue's
* used_count which counts allocator owned RBDs.
* unallocated emergency RBDs must be allocated on exit, otherwise
* when called again the function may not be in emergency mode and
* they will be handed to the allocator with no tracking in the RBD
* allocator counters, which will lead to them never being claimed back
* by the queue.
* by allocating them here, they are now in the queue free list, and
* will be restocked by the next call of iwl_pcie_rxq_restock.
*/
if (unlikely(emergency && count))
iwl_pcie_rxq_alloc_rbs(trans, GFP_ATOMIC);
if (trans_pcie->napi.poll)
napi_gro_flush(&trans_pcie->napi, false);
}
/*
* 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);
int i;
/* W/A for WiFi/WiMAX coex and WiMAX own the RF */
if (trans->cfg->internal_wimax_coex &&
!trans->cfg->apmg_not_supported &&
(!(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_SYNC_HCMD_ACTIVE, &trans->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);
local_bh_disable();
/* The STATUS_FW_ERROR bit is set in this function. This must happen
* before we wake up the command caller, to ensure a proper cleanup. */
iwl_trans_fw_error(trans);
local_bh_enable();
for (i = 0; i < trans->cfg->base_params->num_of_queues; i++)
del_timer(&trans_pcie->txq[i].stuck_timer);
clear_bit(STATUS_SYNC_HCMD_ACTIVE, &trans->status);
wake_up(&trans_pcie->wait_command_queue);
}
static u32 iwl_pcie_int_cause_non_ict(struct iwl_trans *trans)
{
u32 inta;
lockdep_assert_held(&IWL_TRANS_GET_PCIE_TRANS(trans)->irq_lock);
trace_iwlwifi_dev_irq(trans->dev);
/* Discover which interrupts are active/pending */
inta = iwl_read32(trans, CSR_INT);
/* the thread will service interrupts and re-enable them */
return inta;
}