summaryrefslogtreecommitdiff
path: root/drivers/net/wireless/intel/iwlwifi/mei/Makefile
diff options
context:
space:
mode:
authorEmmanuel Grumbach <emmanuel.grumbach@intel.com>2021-11-12 09:28:10 +0300
committerKalle Valo <kvalo@codeaurora.org>2021-11-26 19:31:47 +0300
commit2da4366f9e2c44afedec4acad65a99a3c7da1a35 (patch)
treed4fd4a460044da488be089e6a81288a0e880e342 /drivers/net/wireless/intel/iwlwifi/mei/Makefile
parent2cca3465147d650be3de04927a99784b30251ade (diff)
downloadlinux-2da4366f9e2c44afedec4acad65a99a3c7da1a35.tar.xz
iwlwifi: mei: add the driver to allow cooperation with CSME
CSME in two words ----------------- CSME stands for Converged Security and Management Engine. It is a CPU on the chipset and runs a dedicated firmware. AMT (Active Management Technology) is one of the applications that run on that CPU. AMT allows to control the platform remotely. Here is a partial list of the use cases: * View the screen of the plaform, with keyboard and mouse (KVM) * Attach a remote IDE device * Have a serial console to the device * Query the state of the platform * Reset / shut down / boot the platform Networking in CSME ------------------ For those uses cases, CSME's firmware has an embedded network stack and is able to use the network devices of the system: LAN and WLAN. This is thanks to the CSME's firmware WLAN driver. One can add a profile (SSID / key / certificate) to the CSME's OS and CSME will connect to that profile. Then, one can use the WLAN link to access the applications that run on CSME (AMT is one of them). Note that CSME is active during power state and power state transitions. For example, it is possible to have a KVM session open to the system while the system is rebooting and actually configure the BIOS remotely over WLAN thanks to AMT. How all this is related to Linux -------------------------------- In Linux, there is a driver that allows the OS to talk to the CSME firmware, this driver is drivers/misc/mei. This driver advertises a bus that allows other kernel drivers or even user space) to talk to components inside the CSME firmware. In practice, the system advertises a PCI device that allows to send / receive data to / from the CSME firmware. The mei bus drivers in drivers/misc/mei is an abstration on top of this PCI device. The driver being added here is called iwlmei and talks to the WLAN driver inside the CSME firmware through the mei bus driver. Note that the mei bus driver only gives bus services, it doesn't define the content of the communication. Why do we need this driver? -------------------------- CSME uses the same WLAN device that the OS is expecting to see hence we need an arbitration mechanism. This is what iwlmei is in charge of. iwlmei maintains the communication with the CSME firmware's WLAN driver. The language / protocol that is used between the CSME's firmware WLAN driver and iwlmei is OS agnostic and is called SAP which stands for Software Abritration Protocol. With SAP, iwlmei will be able to tell the CSME firmware's WLAN driver: 1) Please give me the device. 2) Please note that the SW/HW rfkill state change. 3) Please note that I am now associated to X. 4) Please note that I received this packet. etc... There are messages that go the opposite direction as well: 1) Please note that AMT is en/disable. 2) Please note that I believe the OS is broken and hence I'll take the device *now*, whether you like it or not, to make sure that connectivity is preserved. 3) Please note that I am willing to give the device if the OS needs it. 4) Please give me any packet that is sent on UDP / TCP on IP address XX.XX.XX.XX and an port ZZ. 5) Please send this packet. etc... Please check drivers/net/wireless/intel/iwlwifi/mei/sap.h for the full protocol specification. Arbitration is not the only purpose of iwlmei and SAP. SAP also allows to maintain the AMT's functionality even when the OS owns the device. To connect to AMT, one needs to initiate an HTTP connection to port 16992. iwlmei will listen to the Rx path and forward (through SAP) to the CSME firmware the data it got. Then, the embedded HTTP server in the chipset will reply to the request and send a SAP notification to ask iwlmei to send the reply. This way, AMT running on the CSME can still work. In practice this means that all the use cases quoted above (KVM, remote IDE device, etc...) will work even when the OS uses the WLAN device. How to disable all this? --------------------------- iwlmei won't be able to do anything if the CSME's networking stack is not enabled. By default, CSME's networking stack is disabled (this is a BIOS setting). In case the CSME's networking stack is disabled, iwlwifi will just get access to the device because there is no contention with any other actor and, hence, no arbitration is needed. In this patch, I only add the iwlmei driver. Integration with iwlwifi will be implemented in the next one. Co-Developed-by: Ayala Beker <ayala.beker@intel.com> Signed-off-by: Ayala Beker <ayala.beker@intel.com> Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com> v2: fix a few warnings raised by the different bots v3: rewrite the commit message v4: put the debugfs content in a different patch v5: fix a NULL pointer dereference upon DHCP TX if SAP is connected since we now have the required cfg80211 bits in wl-drv-next, add the RFKILL handling patch to this series. v6: change the SAP API to inherit the values from iwl-mei.h removing the need to ensure the values are equal with a BUILD_BUG_ON. This was suggested by Arend v7: * fix a locking issue in case of CSME firmware reset: When the CSME firmware resets, we need to unregister the netdev, first take the mutex, and only then, rely on it being taken. * Add a comment to explain why it is ok to have static variables (iwlmei can't have more than a single instance). * Add a define for 26 + 8 + 8 * Add a define SEND_SAP_MAX_WAIT_ITERATION * make struct const * Reword a bit the Kconfig help message * Ayala added her Signed-off * fixed an RCU annotation v8: do not require ownership upfront, use NIC_OWNER instead. This fixes a deadlock when CSME does not have the right WiFi FW. Add more documentation about the owernship transition Signed-off-by: Kalle Valo <kvalo@codeaurora.org> Link: https://lore.kernel.org/r/20211112062814.7502-2-emmanuel.grumbach@intel.com
Diffstat (limited to 'drivers/net/wireless/intel/iwlwifi/mei/Makefile')
-rw-r--r--drivers/net/wireless/intel/iwlwifi/mei/Makefile8
1 files changed, 8 insertions, 0 deletions
diff --git a/drivers/net/wireless/intel/iwlwifi/mei/Makefile b/drivers/net/wireless/intel/iwlwifi/mei/Makefile
new file mode 100644
index 000000000000..8e3ef0347db7
--- /dev/null
+++ b/drivers/net/wireless/intel/iwlwifi/mei/Makefile
@@ -0,0 +1,8 @@
+# SPDX-License-Identifier: GPL-2.0-only
+obj-$(CONFIG_IWLMEI) += iwlmei.o
+iwlmei-y += main.o
+iwlmei-y += net.o
+iwlmei-$(CONFIG_IWLWIFI_DEVICE_TRACING) += trace.o
+CFLAGS_trace.o := -I$(src)
+
+ccflags-y += -I $(srctree)/$(src)/../