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Commit 45eab7cc authored by Johannes Berg's avatar Johannes Berg
Browse files

iwlwifi: reduce overhead if tracing disabled 



Tracing commands builds an array of trace data
items even when the tracepoint is disabled.
Instead, loop in the tracepoint assignment.

This reduces overhead if tracing is compiled
into the driver but not enabled and slightly
reduces overall driver size as well:

   text	   data	    bss	    dec	    hex	filename
 114514	   6509	     48	 121071	  1d8ef	before/iwlwifi.ko
 114189	   6509	     48	 120746	  1d7aa	after/iwlwifi.ko

Reviewed-by: default avatarEmmanuel Grumbach <emmanuel.grumbach@intel.com>
Reviewed-by: default avatarMax Stepanov <Max.Stepanov@intel.com>
Signed-off-by: default avatarJohannes Berg <johannes.berg@intel.com>
parent 12bf6f45

drivers/net/wireless/iwlwifi/iwl-devtrace.h

+21 −13
Original line number Diff line number Diff line
@@ -29,6 +29,7 @@ 


#include <linux/tracepoint.h>

#include <linux/device.h>

#include "iwl-trans.h"





#if !defined(CONFIG_IWLWIFI_DEVICE_TRACING) || defined(__CHECKER__)
@@ -237,27 +238,34 @@ TRACE_EVENT(iwlwifi_dbg, 
#define TRACE_SYSTEM iwlwifi



TRACE_EVENT(iwlwifi_dev_hcmd,

	TP_PROTO(const struct device *dev, u32 flags,

		 const void *hcmd0, size_t len0,

		 const void *hcmd1, size_t len1,

		 const void *hcmd2, size_t len2),

	TP_ARGS(dev, flags, hcmd0, len0, hcmd1, len1, hcmd2, len2),

	TP_PROTO(const struct device *dev,

		 struct iwl_host_cmd *cmd, u16 total_size,

		 const void *hdr, size_t hdr_len),

	TP_ARGS(dev, cmd, total_size, hdr, hdr_len),

	TP_STRUCT__entry(

		DEV_ENTRY

		__dynamic_array(u8, hcmd0, len0)

		__dynamic_array(u8, hcmd1, len1)

		__dynamic_array(u8, hcmd2, len2)

		__dynamic_array(u8, hcmd, total_size)

		__field(u32, flags)

	),

	TP_fast_assign(

		int i, offset = hdr_len;



		DEV_ASSIGN;

		memcpy(__get_dynamic_array(hcmd0), hcmd0, len0);

		memcpy(__get_dynamic_array(hcmd1), hcmd1, len1);

		memcpy(__get_dynamic_array(hcmd2), hcmd2, len2);

		__entry->flags = flags;

		__entry->flags = cmd->flags;

		memcpy(__get_dynamic_array(hcmd), hdr, hdr_len);



		for (i = 0; i < IWL_MAX_CMD_TFDS; i++) {

			if (!cmd->len[i])

				continue;

			if (!(cmd->dataflags[i] & IWL_HCMD_DFL_NOCOPY))

				continue;

			memcpy((u8 *)__get_dynamic_array(hcmd) + offset,

			       cmd->data[i], cmd->len[i]);

			offset += cmd->len[i];

		}

	),

	TP_printk("[%s] hcmd %#.2x (%ssync)",

		  __get_str(dev), ((u8 *)__get_dynamic_array(hcmd0))[0],

		  __get_str(dev), ((u8 *)__get_dynamic_array(hcmd))[0],

		  __entry->flags & CMD_ASYNC ? "a" : "")

);

drivers/net/wireless/iwlwifi/pcie/tx.c

+2 −23
Original line number Diff line number Diff line
@@ -522,11 +522,6 @@ static int iwl_enqueue_hcmd(struct iwl_trans *trans, struct iwl_host_cmd *cmd) 
	bool had_nocopy = false;

	int i;

	u32 cmd_pos;

#ifdef CONFIG_IWLWIFI_DEVICE_TRACING

	const void *trace_bufs[IWL_MAX_CMD_TFDS + 1] = {};

	int trace_lens[IWL_MAX_CMD_TFDS + 1] = {};

	int trace_idx;

#endif



	copy_size = sizeof(out_cmd->hdr);

	cmd_size = sizeof(out_cmd->hdr);
@@ -628,11 +623,6 @@ static int iwl_enqueue_hcmd(struct iwl_trans *trans, struct iwl_host_cmd *cmd) 
	dma_unmap_len_set(out_meta, len, copy_size);



	iwlagn_txq_attach_buf_to_tfd(trans, txq, phys_addr, copy_size, 1);

#ifdef CONFIG_IWLWIFI_DEVICE_TRACING

	trace_bufs[0] = &out_cmd->hdr;

	trace_lens[0] = copy_size;

	trace_idx = 1;

#endif



	for (i = 0; i < IWL_MAX_CMD_TFDS; i++) {

		if (!cmd->len[i])
@@ -651,25 +641,14 @@ static int iwl_enqueue_hcmd(struct iwl_trans *trans, struct iwl_host_cmd *cmd) 


		iwlagn_txq_attach_buf_to_tfd(trans, txq, phys_addr,

					     cmd->len[i], 0);

#ifdef CONFIG_IWLWIFI_DEVICE_TRACING

		trace_bufs[trace_idx] = cmd->data[i];

		trace_lens[trace_idx] = cmd->len[i];

		trace_idx++;

#endif

	}



	out_meta->flags = cmd->flags;



	txq->need_update = 1;



	/* check that tracing gets all possible blocks */

	BUILD_BUG_ON(IWL_MAX_CMD_TFDS + 1 != 3);

#ifdef CONFIG_IWLWIFI_DEVICE_TRACING

	trace_iwlwifi_dev_hcmd(trans->dev, cmd->flags,

			       trace_bufs[0], trace_lens[0],

			       trace_bufs[1], trace_lens[1],

			       trace_bufs[2], trace_lens[2]);

#endif

	trace_iwlwifi_dev_hcmd(trans->dev, cmd, cmd_size,

			       &out_cmd->hdr, copy_size);



	/* start timer if queue currently empty */

	if (q->read_ptr == q->write_ptr && trans_pcie->wd_timeout)