wifi: iwlwifi: mvm: Add support for wowlan info notification

IMR (Isolated Memory Regions) is a mechanism to protect memory regions
from unwarranted access by agents in the system that should not have access
to that memory.

When IMR is enabled, pages in the DRAM will be located within the IMR
memory space, accessible only by the device.
As a side effect, during S4 (a.k.a hibernate) the IMR memory space
is not retained.

While the DRAM is saved to the disk and restored by the OS upon resume,
the IMR, which is hidden from the OS neither saved upon suspend nor
restored upon resume.

As a consequence of the above, it turned out that commands cannot
be sent as part of the resume flow, and so after ending
d3 the FW needs to use notifications instead of cmd-resp.

The resume flow becomes asynchronous, with a series
of notifications, starting with wowlan_info_notif, through
wowlan_pkt_notif and complete the resume flow by d3_end_notif.

This patch adds the support for wowlan info notification.

The wake packet has been removed from the wowlan info struct
and will be handled in a dedicated notification.

Signed-off-by: Yedidya Benshimol <yedidya.ben.shimol@intel.com>
Signed-off-by: Haim Dreyfuss <haim.dreyfuss@intel.com>
Signed-off-by: Gregory Greenman <gregory.greenman@intel.com>
Link: https://lore.kernel.org/r/20220906161827.3ce8deefd929.Ieba8610e8bb4bec788076371ae38becb4a3d20d5@changeid
Signed-off-by: Gregory Greenman <gregory.greenman@intel.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/ops.c b/drivers/net/wireless/intel/iwlwifi/mvm/ops.c
index 7ed4f5a0abc3..e380ee841773 100644
--- a/drivers/net/wireless/intel/iwlwifi/mvm/ops.c
+++ b/drivers/net/wireless/intel/iwlwifi/mvm/ops.c
@@ -574,6 +574,7 @@ static const struct iwl_hcmd_names iwl_mvm_location_names[] = {
  * Access is done through binary search
  */
 static const struct iwl_hcmd_names iwl_mvm_prot_offload_names[] = {
+	HCMD_NAME(WOWLAN_INFO_NOTIFICATION),
 	HCMD_NAME(STORED_BEACON_NTF),
 };