iwlwifi: mvm: Add FW paging mechanism for the UMAC on SDIO

Family 8000 products has 2 embedded processors, the first
known as LMAC (lower MAC) and implements the functionality from
previous products, the second one is known as UMAC (upper MAC)
and is used mainly for driver offloads as well as new features.
The UMAC is typically “less” real-time than the LMAC and is used
for higher level controls.
The UMAC's code/data size is estimated to be in the mega-byte arena,
taking into account the code it needs to replace in the driver and
the set of new features.

In order to allow the UMAC to execute code that is bigger than its code
memory, we allow the UMAC embedded processor to page out code pages on
DRAM.

When the device is slave on the bus(SDIO) the driver saves the UMAC's
image pages in blocks of 32K in the DRAM and sends the layout of the
pages to the FW. When the FW wants load / unload pages, it creates an
interrupt,	and the driver uploads / downloads the page to an address in
the a specific address on the device's memory.

The driver can support up to 1 MB of pages.

Add paging mechanism for the UMAC on SDIO in order to allow the program to
use a larger virtual space while using less physical memory on the device
itself.

Signed-off-by: Matti Gottlieb <matti.gottlieb@intel.com>
Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>

1 files changed, 14 insertions, 0 deletions

diff --git a/drivers/net/wireless/iwlwifi/iwl-trans.h b/drivers/net/wireless/iwlwifi/iwl-trans.h
index 151e3de2247f..9d8b5cb06343 100644
--- a/drivers/net/wireless/iwlwifi/iwl-trans.h
+++ b/drivers/net/wireless/iwlwifi/iwl-trans.h
@@ -668,6 +668,12 @@ enum iwl_d0i3_mode {
  * @dbg_conf_tlv: array of pointers to configuration TLVs for debug
  * @dbg_trigger_tlv: array of pointers to triggers TLVs for debug
  * @dbg_dest_reg_num: num of reg_ops in %dbg_dest_tlv
+ * @paging_req_addr: The location were the FW will upload / download the pages
+ *	from. The address is set by the opmode
+ * @paging_db: Pointer to the opmode paging data base, the pointer is set by
+ *	the opmode.
+ * @paging_download_buf: Buffer used for copying all of the pages before
+ *	downloading them to the FW. The buffer is allocated in the opmode
  */
 struct iwl_trans {
 	const struct iwl_trans_ops *ops;
@@ -705,6 +711,14 @@ struct iwl_trans {
 	struct iwl_fw_dbg_trigger_tlv * const *dbg_trigger_tlv;
 	u8 dbg_dest_reg_num;
 
+	/*
+	 * Paging parameters - All of the parameters should be set by the
+	 * opmode when paging is enabled
+	 */
+	u32 paging_req_addr;
+	struct iwl_fw_paging *paging_db;
+	void *paging_download_buf;
+
 	enum iwl_d0i3_mode d0i3_mode;
 
 	bool wowlan_d0i3;