Hello Greg,
On 7/7/23 12:37, Greg KH wrote:
On Wed, Jul 05, 2023 at 07:27:54PM +0200, Gatien Chevallier wrote:
Introduce a firewall framework that offers to firewall consumers different
firewall services such as the ability to check their access rights against
their firewall controller(s).
The firewall framework offers a generic API that is defined in firewall
controllers drivers to best fit the specificity of each firewall.
But you aren't defining a "generic" api here, you are defining a
specific one for your specific hardware.
Or am I missing something?
This framework is indeed ST-oriented, I should have specified :
"...offers a generic API for STM32 firewall controllers that is defined
in their drivers...". Will change in V2
There are various types of firewalls:
-Peripheral firewalls that filter accesses to peripherals
-Memory firewalls that filter accesses to memories or memory regions
-Resource firewalls that filter accesses to internal resources such as
reset and clock controllers
A firewall controller must be probed at arch_initcall level and register
to the framework so that consumers can use their services.
Why must it happen at arch_initcall? So it can never be a module? That
feels wrong.
Rob asked the same question.
I responded under his comment, I'm not quite sure how to handle it with
fw_devlink for dependencies with drivers that are probed at early init
levels.
Signed-off-by: Gatien Chevallier <gatien.chevallier@xxxxxxxxxxx>
---
MAINTAINERS | 5 +
arch/arm64/Kconfig.platforms | 1 +
drivers/bus/Kconfig | 10 +
drivers/bus/Makefile | 1 +
drivers/bus/stm32_firewall.c | 252 ++++++++++++++++++++++
drivers/bus/stm32_firewall.h | 83 +++++++
include/linux/bus/stm32_firewall_device.h | 134 ++++++++++++
7 files changed, 486 insertions(+)
create mode 100644 drivers/bus/stm32_firewall.c
create mode 100644 drivers/bus/stm32_firewall.h
create mode 100644 include/linux/bus/stm32_firewall_device.h
diff --git a/MAINTAINERS b/MAINTAINERS
index 41385f01fa98..fabf95ba9b86 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -20123,6 +20123,11 @@ T: git git://linuxtv.org/media_tree.git
F: Documentation/devicetree/bindings/media/i2c/st,st-mipid02.yaml
F: drivers/media/i2c/st-mipid02.c
+ST STM32 FIREWALL
+M: Gatien Chevallier <gatien.chevallier@xxxxxxxxxxx>
+S: Maintained
+F: drivers/bus/stm32_firewall.c
+
ST STM32 I2C/SMBUS DRIVER
M: Pierre-Yves MORDRET <pierre-yves.mordret@xxxxxxxxxxx>
M: Alain Volmat <alain.volmat@xxxxxxxxxxx>
diff --git a/arch/arm64/Kconfig.platforms b/arch/arm64/Kconfig.platforms
index 6069120199bb..5a46e90f1e4e 100644
--- a/arch/arm64/Kconfig.platforms
+++ b/arch/arm64/Kconfig.platforms
@@ -293,6 +293,7 @@ config ARCH_STM32
select ARM_SMC_MBOX
select ARM_SCMI_PROTOCOL
select COMMON_CLK_SCMI
+ select STM32_FIREWALL
help
This enables support for ARMv8 based STMicroelectronics
STM32 family, including:
diff --git a/drivers/bus/Kconfig b/drivers/bus/Kconfig
index fcfa280df98a..4d54a7ea52b2 100644
--- a/drivers/bus/Kconfig
+++ b/drivers/bus/Kconfig
@@ -163,6 +163,16 @@ config QCOM_SSC_BLOCK_BUS
i2c/spi/uart controllers, a hexagon core, and a clock controller
which provides clocks for the above.
+config STM32_FIREWALL
+ bool "STM32 Firewall framework"
+ depends on ARCH_STM32
Why this dependency?
+ default MACH_STM32MP157 || MACH_STM32MP13 || MACH_STM32MP25
+ help
+ Say y to enable firewall framework and its services. Firewall
+ controllers will be able to register to the framework. Firewall
+ controllers must be initialized and register to the firewall framework
+ at arch_initcall level.
This needs better wording saying it is only for stm32 devices.
Ack, will change in V2.
+
config SUN50I_DE2_BUS
bool "Allwinner A64 DE2 Bus Driver"
default ARM64
diff --git a/drivers/bus/Makefile b/drivers/bus/Makefile
index d90eed189a65..fc0511450ec2 100644
--- a/drivers/bus/Makefile
+++ b/drivers/bus/Makefile
@@ -26,6 +26,7 @@ obj-$(CONFIG_OMAP_INTERCONNECT) += omap_l3_smx.o omap_l3_noc.o
obj-$(CONFIG_OMAP_OCP2SCP) += omap-ocp2scp.o
obj-$(CONFIG_QCOM_EBI2) += qcom-ebi2.o
obj-$(CONFIG_QCOM_SSC_BLOCK_BUS) += qcom-ssc-block-bus.o
+obj-$(CONFIG_STM32_FIREWALL) += stm32_firewall.o
obj-$(CONFIG_SUN50I_DE2_BUS) += sun50i-de2.o
obj-$(CONFIG_SUNXI_RSB) += sunxi-rsb.o
obj-$(CONFIG_OF) += simple-pm-bus.o
diff --git a/drivers/bus/stm32_firewall.c b/drivers/bus/stm32_firewall.c
new file mode 100644
index 000000000000..510db5bc6eaf
--- /dev/null
+++ b/drivers/bus/stm32_firewall.c
@@ -0,0 +1,252 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
Are you _SURE_ this needs to be "or later"? Sorry, I have to ask.
thanks,
greg k-h
I'll change to (GPL-2.0-only OR BSD-3-Clause) :)
Best regards,
Gatien
