From: Johannes Berg Date: Tue, 4 Sep 2012 22:33:53 +0000 (+0200) Subject: iwlwifi: reduce overhead if tracing disabled X-Git-Url: http://drtracing.org/?a=commitdiff_plain;h=45eab7ccacb2c2e63f7645fa92a7f742898044b4;p=deliverable%2Flinux.git 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: Emmanuel Grumbach Reviewed-by: Max Stepanov Signed-off-by: Johannes Berg --- diff --git a/drivers/net/wireless/iwlwifi/iwl-devtrace.h b/drivers/net/wireless/iwlwifi/iwl-devtrace.h index 06ca505bb2cc..59a5f78402fc 100644 --- a/drivers/net/wireless/iwlwifi/iwl-devtrace.h +++ b/drivers/net/wireless/iwlwifi/iwl-devtrace.h @@ -29,6 +29,7 @@ #include #include +#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" : "") ); diff --git a/drivers/net/wireless/iwlwifi/pcie/tx.c b/drivers/net/wireless/iwlwifi/pcie/tx.c index 392d2bc5e357..105e3af3c621 100644 --- a/drivers/net/wireless/iwlwifi/pcie/tx.c +++ b/drivers/net/wireless/iwlwifi/pcie/tx.c @@ -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)