[PATCH v2 6/6] arm64: dts: ti: iot2050: Enforce DMA isolation for devices behind PCI RC
From: Jan Kiszka <jan.kiszka@siemens.com>
Date: 2024-08-26 21:50:15
Also in:
linux-devicetree, lkml
Subsystem:
arm/texas instruments k3 architecture, the rest · Maintainers:
Nishanth Menon, Vignesh Raghavendra, Tero Kristo, Linus Torvalds
From: Jan Kiszka <jan.kiszka@siemens.com> Reserve a 64M memory region below the top of 1G RAM (smallest RAM size across the series, space left for firmware carve-outs) and ensure that all PCI devices do their DMA only inside that region. This is configured via a restricted-dma-pool and enforced with the help of the first PVU. Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com> --- .../boot/dts/ti/k3-am65-iot2050-common.dtsi | 32 +++++++++++++++++++ 1 file changed, 32 insertions(+)
diff --git a/arch/arm64/boot/dts/ti/k3-am65-iot2050-common.dtsi b/arch/arm64/boot/dts/ti/k3-am65-iot2050-common.dtsi
index e76828ccf21b..cc0f33e3519c 100644
--- a/arch/arm64/boot/dts/ti/k3-am65-iot2050-common.dtsi
+++ b/arch/arm64/boot/dts/ti/k3-am65-iot2050-common.dtsi@@ -82,6 +82,11 @@ wdt_reset_memory_region: wdt-memory@a2200000 { reg = <0x00 0xa2200000 0x00 0x1000>; no-map; }; + + pci_restricted_dma_region: restricted-dma@ba000000 { + compatible = "restricted-dma-pool"; + reg = <0 0xba000000 0 0x4000000>; + }; }; leds {
@@ -571,6 +576,10 @@ seboot-backup@e80000 { }; }; +&pcie0_rc { + memory-region = <&pci_restricted_dma_region>; +}; + &pcie1_rc { status = "okay"; pinctrl-names = "default";
@@ -580,6 +589,8 @@ &pcie1_rc { phys = <&serdes1 PHY_TYPE_PCIE 0>; phy-names = "pcie-phy0"; reset-gpios = <&wkup_gpio0 27 GPIO_ACTIVE_HIGH>; + + memory-region = <&pci_restricted_dma_region>; }; &mailbox0_cluster0 {
@@ -640,3 +651,24 @@ &mcu_r5fss0 { /* lock-step mode not supported on iot2050 boards */ ti,cluster-mode = <0>; }; + +&main_navss { + ti_pvu0: ti-pvu@30f80000 { + compatible = "ti,am654-pvu"; + reg = <0 0x30f80000 0 0x1000>, + <0 0x36000000 0 0x100000>; + reg-names = "cfg", "tlbif"; + interrupts-extended = <&intr_main_navss 390>; + interrupt-names = "pvu"; + }; + + ti_pvu1: ti-pvu@30f81000 { + compatible = "ti,am654-pvu"; + reg = <0 0x30f81000 0 0x1000>, + <0 0x36100000 0 0x100000>; + reg-names = "cfg", "tlbif"; + interrupts-extended = <&intr_main_navss 389>; + interrupt-names = "pvu"; + status = "disabled"; + }; +};
--
2.43.0