diff options
| author | Johannes Berg | 2013-05-03 11:44:16 +0200 |
|---|---|---|
| committer | Johannes Berg | 2013-05-14 10:42:37 +0200 |
| commit | afc66bb734d44ea64cc78ae8d8034886e8cfb2c7 (patch) | |
| tree | 5a54d7ccfdc8c25833089db43a25e7f4d5f85b6e /drivers/net/wireless/iwlwifi/mvm/d3.c | |
| parent | 93fc64114b994f9ef6901697f9b0de00762680e9 (diff) | |
iwlwifi: mvm: optionally store D3 SRAM after resume
The D3 image SRAM is overwritten by the runtime image, so
it can't be accessed after resume. However, it can be very
useful to look at it to know what happened during D3, so
add the ability to store the image and make it available
in debugfs.
Reviewed-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Diffstat (limited to 'drivers/net/wireless/iwlwifi/mvm/d3.c')
| -rw-r--r-- | drivers/net/wireless/iwlwifi/mvm/d3.c | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/drivers/net/wireless/iwlwifi/mvm/d3.c b/drivers/net/wireless/iwlwifi/mvm/d3.c index 16bbdcc8627a..63d788aef3f4 100644 --- a/drivers/net/wireless/iwlwifi/mvm/d3.c +++ b/drivers/net/wireless/iwlwifi/mvm/d3.c @@ -1214,6 +1214,26 @@ static void iwl_mvm_query_wakeup_reasons(struct iwl_mvm *mvm, iwl_free_resp(&cmd); } +static void iwl_mvm_read_d3_sram(struct iwl_mvm *mvm) +{ +#ifdef CONFIG_IWLWIFI_DEBUGFS + const struct fw_img *img = &mvm->fw->img[IWL_UCODE_WOWLAN]; + u32 len = img->sec[IWL_UCODE_SECTION_DATA].len; + u32 offs = img->sec[IWL_UCODE_SECTION_DATA].offset; + + if (!mvm->store_d3_resume_sram) + return; + + if (!mvm->d3_resume_sram) { + mvm->d3_resume_sram = kzalloc(len, GFP_KERNEL); + if (!mvm->d3_resume_sram) + return; + } + + iwl_trans_read_mem_bytes(mvm->trans, offs, mvm->d3_resume_sram, len); +#endif +} + int iwl_mvm_resume(struct ieee80211_hw *hw) { struct iwl_mvm *mvm = IWL_MAC80211_GET_MVM(hw); @@ -1245,6 +1265,9 @@ int iwl_mvm_resume(struct ieee80211_hw *hw) goto out_unlock; } + /* query SRAM first in case we want event logging */ + iwl_mvm_read_d3_sram(mvm); + iwl_mvm_query_wakeup_reasons(mvm, vif); out_unlock: |