260 lines
7.2 KiB
C
260 lines
7.2 KiB
C
// SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause
|
|
/*
|
|
* Copyright (C) 2017 Intel Deutschland GmbH
|
|
* Copyright (C) 2018-2020 Intel Corporation
|
|
*/
|
|
#include <net/tso.h>
|
|
#include <linux/tcp.h>
|
|
|
|
#include "iwl-debug.h"
|
|
#include "iwl-csr.h"
|
|
#include "iwl-io.h"
|
|
#include "internal.h"
|
|
#include "fw/api/tx.h"
|
|
#include "queue/tx.h"
|
|
|
|
/*************** HOST COMMAND QUEUE FUNCTIONS *****/
|
|
|
|
/*
|
|
* iwl_pcie_gen2_enqueue_hcmd - enqueue a uCode command
|
|
* @priv: device private data point
|
|
* @cmd: a pointer to the ucode command structure
|
|
*
|
|
* The function returns < 0 values to indicate the operation
|
|
* failed. On success, it returns the index (>= 0) of command in the
|
|
* command queue.
|
|
*/
|
|
int iwl_pcie_gen2_enqueue_hcmd(struct iwl_trans *trans,
|
|
struct iwl_host_cmd *cmd)
|
|
{
|
|
struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
|
|
struct iwl_txq *txq = trans->txqs.txq[trans->txqs.cmd.q_id];
|
|
struct iwl_device_cmd *out_cmd;
|
|
struct iwl_cmd_meta *out_meta;
|
|
void *dup_buf = NULL;
|
|
dma_addr_t phys_addr;
|
|
int i, cmd_pos, idx;
|
|
u16 copy_size, cmd_size, tb0_size;
|
|
bool had_nocopy = false;
|
|
u8 group_id = iwl_cmd_groupid(cmd->id);
|
|
const u8 *cmddata[IWL_MAX_CMD_TBS_PER_TFD];
|
|
u16 cmdlen[IWL_MAX_CMD_TBS_PER_TFD];
|
|
struct iwl_tfh_tfd *tfd;
|
|
unsigned long flags;
|
|
|
|
copy_size = sizeof(struct iwl_cmd_header_wide);
|
|
cmd_size = sizeof(struct iwl_cmd_header_wide);
|
|
|
|
for (i = 0; i < IWL_MAX_CMD_TBS_PER_TFD; i++) {
|
|
cmddata[i] = cmd->data[i];
|
|
cmdlen[i] = cmd->len[i];
|
|
|
|
if (!cmd->len[i])
|
|
continue;
|
|
|
|
/* need at least IWL_FIRST_TB_SIZE copied */
|
|
if (copy_size < IWL_FIRST_TB_SIZE) {
|
|
int copy = IWL_FIRST_TB_SIZE - copy_size;
|
|
|
|
if (copy > cmdlen[i])
|
|
copy = cmdlen[i];
|
|
cmdlen[i] -= copy;
|
|
cmddata[i] += copy;
|
|
copy_size += copy;
|
|
}
|
|
|
|
if (cmd->dataflags[i] & IWL_HCMD_DFL_NOCOPY) {
|
|
had_nocopy = true;
|
|
if (WARN_ON(cmd->dataflags[i] & IWL_HCMD_DFL_DUP)) {
|
|
idx = -EINVAL;
|
|
goto free_dup_buf;
|
|
}
|
|
} else if (cmd->dataflags[i] & IWL_HCMD_DFL_DUP) {
|
|
/*
|
|
* This is also a chunk that isn't copied
|
|
* to the static buffer so set had_nocopy.
|
|
*/
|
|
had_nocopy = true;
|
|
|
|
/* only allowed once */
|
|
if (WARN_ON(dup_buf)) {
|
|
idx = -EINVAL;
|
|
goto free_dup_buf;
|
|
}
|
|
|
|
dup_buf = kmemdup(cmddata[i], cmdlen[i],
|
|
GFP_ATOMIC);
|
|
if (!dup_buf)
|
|
return -ENOMEM;
|
|
} else {
|
|
/* NOCOPY must not be followed by normal! */
|
|
if (WARN_ON(had_nocopy)) {
|
|
idx = -EINVAL;
|
|
goto free_dup_buf;
|
|
}
|
|
copy_size += cmdlen[i];
|
|
}
|
|
cmd_size += cmd->len[i];
|
|
}
|
|
|
|
/*
|
|
* If any of the command structures end up being larger than the
|
|
* TFD_MAX_PAYLOAD_SIZE and they aren't dynamically allocated into
|
|
* separate TFDs, then we will need to increase the size of the buffers
|
|
*/
|
|
if (WARN(copy_size > TFD_MAX_PAYLOAD_SIZE,
|
|
"Command %s (%#x) is too large (%d bytes)\n",
|
|
iwl_get_cmd_string(trans, cmd->id), cmd->id, copy_size)) {
|
|
idx = -EINVAL;
|
|
goto free_dup_buf;
|
|
}
|
|
|
|
spin_lock_irqsave(&txq->lock, flags);
|
|
|
|
idx = iwl_txq_get_cmd_index(txq, txq->write_ptr);
|
|
tfd = iwl_txq_get_tfd(trans, txq, txq->write_ptr);
|
|
memset(tfd, 0, sizeof(*tfd));
|
|
|
|
if (iwl_txq_space(trans, txq) < ((cmd->flags & CMD_ASYNC) ? 2 : 1)) {
|
|
spin_unlock_irqrestore(&txq->lock, flags);
|
|
|
|
IWL_ERR(trans, "No space in command queue\n");
|
|
iwl_op_mode_cmd_queue_full(trans->op_mode);
|
|
idx = -ENOSPC;
|
|
goto free_dup_buf;
|
|
}
|
|
|
|
out_cmd = txq->entries[idx].cmd;
|
|
out_meta = &txq->entries[idx].meta;
|
|
|
|
/* re-initialize to NULL */
|
|
memset(out_meta, 0, sizeof(*out_meta));
|
|
if (cmd->flags & CMD_WANT_SKB)
|
|
out_meta->source = cmd;
|
|
|
|
/* set up the header */
|
|
out_cmd->hdr_wide.cmd = iwl_cmd_opcode(cmd->id);
|
|
out_cmd->hdr_wide.group_id = group_id;
|
|
out_cmd->hdr_wide.version = iwl_cmd_version(cmd->id);
|
|
out_cmd->hdr_wide.length =
|
|
cpu_to_le16(cmd_size - sizeof(struct iwl_cmd_header_wide));
|
|
out_cmd->hdr_wide.reserved = 0;
|
|
out_cmd->hdr_wide.sequence =
|
|
cpu_to_le16(QUEUE_TO_SEQ(trans->txqs.cmd.q_id) |
|
|
INDEX_TO_SEQ(txq->write_ptr));
|
|
|
|
cmd_pos = sizeof(struct iwl_cmd_header_wide);
|
|
copy_size = sizeof(struct iwl_cmd_header_wide);
|
|
|
|
/* and copy the data that needs to be copied */
|
|
for (i = 0; i < IWL_MAX_CMD_TBS_PER_TFD; i++) {
|
|
int copy;
|
|
|
|
if (!cmd->len[i])
|
|
continue;
|
|
|
|
/* copy everything if not nocopy/dup */
|
|
if (!(cmd->dataflags[i] & (IWL_HCMD_DFL_NOCOPY |
|
|
IWL_HCMD_DFL_DUP))) {
|
|
copy = cmd->len[i];
|
|
|
|
memcpy((u8 *)out_cmd + cmd_pos, cmd->data[i], copy);
|
|
cmd_pos += copy;
|
|
copy_size += copy;
|
|
continue;
|
|
}
|
|
|
|
/*
|
|
* Otherwise we need at least IWL_FIRST_TB_SIZE copied
|
|
* in total (for bi-directional DMA), but copy up to what
|
|
* we can fit into the payload for debug dump purposes.
|
|
*/
|
|
copy = min_t(int, TFD_MAX_PAYLOAD_SIZE - cmd_pos, cmd->len[i]);
|
|
|
|
memcpy((u8 *)out_cmd + cmd_pos, cmd->data[i], copy);
|
|
cmd_pos += copy;
|
|
|
|
/* However, treat copy_size the proper way, we need it below */
|
|
if (copy_size < IWL_FIRST_TB_SIZE) {
|
|
copy = IWL_FIRST_TB_SIZE - copy_size;
|
|
|
|
if (copy > cmd->len[i])
|
|
copy = cmd->len[i];
|
|
copy_size += copy;
|
|
}
|
|
}
|
|
|
|
IWL_DEBUG_HC(trans,
|
|
"Sending command %s (%.2x.%.2x), seq: 0x%04X, %d bytes at %d[%d]:%d\n",
|
|
iwl_get_cmd_string(trans, cmd->id), group_id,
|
|
out_cmd->hdr.cmd, le16_to_cpu(out_cmd->hdr.sequence),
|
|
cmd_size, txq->write_ptr, idx, trans->txqs.cmd.q_id);
|
|
|
|
/* start the TFD with the minimum copy bytes */
|
|
tb0_size = min_t(int, copy_size, IWL_FIRST_TB_SIZE);
|
|
memcpy(&txq->first_tb_bufs[idx], out_cmd, tb0_size);
|
|
iwl_txq_gen2_set_tb(trans, tfd, iwl_txq_get_first_tb_dma(txq, idx),
|
|
tb0_size);
|
|
|
|
/* map first command fragment, if any remains */
|
|
if (copy_size > tb0_size) {
|
|
phys_addr = dma_map_single(trans->dev,
|
|
(u8 *)out_cmd + tb0_size,
|
|
copy_size - tb0_size,
|
|
DMA_TO_DEVICE);
|
|
if (dma_mapping_error(trans->dev, phys_addr)) {
|
|
idx = -ENOMEM;
|
|
iwl_txq_gen2_tfd_unmap(trans, out_meta, tfd);
|
|
goto out;
|
|
}
|
|
iwl_txq_gen2_set_tb(trans, tfd, phys_addr,
|
|
copy_size - tb0_size);
|
|
}
|
|
|
|
/* map the remaining (adjusted) nocopy/dup fragments */
|
|
for (i = 0; i < IWL_MAX_CMD_TBS_PER_TFD; i++) {
|
|
void *data = (void *)(uintptr_t)cmddata[i];
|
|
|
|
if (!cmdlen[i])
|
|
continue;
|
|
if (!(cmd->dataflags[i] & (IWL_HCMD_DFL_NOCOPY |
|
|
IWL_HCMD_DFL_DUP)))
|
|
continue;
|
|
if (cmd->dataflags[i] & IWL_HCMD_DFL_DUP)
|
|
data = dup_buf;
|
|
phys_addr = dma_map_single(trans->dev, data,
|
|
cmdlen[i], DMA_TO_DEVICE);
|
|
if (dma_mapping_error(trans->dev, phys_addr)) {
|
|
idx = -ENOMEM;
|
|
iwl_txq_gen2_tfd_unmap(trans, out_meta, tfd);
|
|
goto out;
|
|
}
|
|
iwl_txq_gen2_set_tb(trans, tfd, phys_addr, cmdlen[i]);
|
|
}
|
|
|
|
BUILD_BUG_ON(IWL_TFH_NUM_TBS > sizeof(out_meta->tbs) * BITS_PER_BYTE);
|
|
out_meta->flags = cmd->flags;
|
|
if (WARN_ON_ONCE(txq->entries[idx].free_buf))
|
|
kfree_sensitive(txq->entries[idx].free_buf);
|
|
txq->entries[idx].free_buf = dup_buf;
|
|
|
|
trace_iwlwifi_dev_hcmd(trans->dev, cmd, cmd_size, &out_cmd->hdr_wide);
|
|
|
|
/* start timer if queue currently empty */
|
|
if (txq->read_ptr == txq->write_ptr && txq->wd_timeout)
|
|
mod_timer(&txq->stuck_timer, jiffies + txq->wd_timeout);
|
|
|
|
spin_lock(&trans_pcie->reg_lock);
|
|
/* Increment and update queue's write index */
|
|
txq->write_ptr = iwl_txq_inc_wrap(trans, txq->write_ptr);
|
|
iwl_txq_inc_wr_ptr(trans, txq);
|
|
spin_unlock(&trans_pcie->reg_lock);
|
|
|
|
out:
|
|
spin_unlock_irqrestore(&txq->lock, flags);
|
|
free_dup_buf:
|
|
if (idx < 0)
|
|
kfree(dup_buf);
|
|
return idx;
|
|
}
|