From 6668ed271eaefaa63e686bdfbedaeb7b8e492722 Mon Sep 17 00:00:00 2001 From: Kumar Kartikeya Dwivedi Date: Fri, 4 Sep 2026 10:43:19 +0200 Subject: selftests/bpf: Reject graph kptr use after RCU unlock Add a sleepable verifier test that loads a graph-node local kptr in an explicit RCU read-side critical section, then passes its node to bpf_rbtree_remove() after the section ends. Before the verifier fix, the stale NON_OWN_REF flag makes the node look like a live borrowed reference and the program is accepted. After the fix, the pointer is demoted without NON_OWN_REF and the graph kfunc argument is rejected. Also exercise a graph kptr loaded while a spin lock provides implicit RCU protection. The pointer must be invalidated when the lock is released, which guards the required ordering between non-owning-reference invalidation and RCU demotion. Update the existing fault-protected load test state description. The post-unlock pointer no longer carries NON_OWN_REF, but remains readable because the load is rewritten to use BPF_PROBE_MEM. Signed-off-by: Kumar Kartikeya Dwivedi Link: https://lore.kernel.org/r/20260904084325.52250-7-memxor@gmail.com Signed-off-by: Alexei Starovoitov --- drivers/dma/loongson/Kconfig | 41 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 41 insertions(+) create mode 100644 drivers/dma/loongson/Kconfig (limited to 'drivers/dma/loongson/Kconfig') diff --git a/drivers/dma/loongson/Kconfig b/drivers/dma/loongson/Kconfig new file mode 100644 index 000000000..c4e62dce5 --- /dev/null +++ b/drivers/dma/loongson/Kconfig @@ -0,0 +1,41 @@ +# SPDX-License-Identifier: GPL-2.0-only +# +# Loongson DMA controllers drivers +# +if MACH_LOONGSON32 || MACH_LOONGSON64 || COMPILE_TEST + +config LOONGSON1_APB_DMA + tristate "Loongson1 APB DMA support" + depends on MACH_LOONGSON32 || COMPILE_TEST + select DMA_ENGINE + select DMA_VIRTUAL_CHANNELS + help + This selects support for the APB DMA controller in Loongson1 SoCs, + which is required by Loongson1 NAND and audio support. + +config LOONGSON2_APB_DMA + tristate "Loongson2 APB DMA support" + depends on MACH_LOONGSON64 || COMPILE_TEST + select DMA_ENGINE + select DMA_VIRTUAL_CHANNELS + help + Support for the Loongson2 APB DMA controller driver. The + DMA controller is having single DMA channel which can be + configured for different peripherals like audio, nand, sdio + etc which is in APB bus. + + This DMA controller transfers data from memory to peripheral fifo. + It does not support memory to memory data transfer. + +config LOONGSON2_APB_CMC_DMA + tristate "Loongson2 Chain Multi-Channel DMA support" + depends on MACH_LOONGSON64 || COMPILE_TEST + select DMA_ENGINE + select DMA_VIRTUAL_CHANNELS + help + Support for the Loongson Chain Multi-Channel DMA controller driver. + It is discovered on the Loongson-2K chip (Loongson-2K0300/Loongson-2K3000), + which has 4/8 channels internally, enabling bidirectional data transfer + between devices and memory. + +endif -- cgit v1.3.1