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/clk/aspeed/clk-aspeed.h | 82 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 82 insertions(+) create mode 100644 drivers/clk/aspeed/clk-aspeed.h (limited to 'drivers/clk/aspeed/clk-aspeed.h') diff --git a/drivers/clk/aspeed/clk-aspeed.h b/drivers/clk/aspeed/clk-aspeed.h new file mode 100644 index 000000000..5296b15b1 --- /dev/null +++ b/drivers/clk/aspeed/clk-aspeed.h @@ -0,0 +1,82 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +/* + * Structures used by ASPEED clock drivers + * + * Copyright 2019 IBM Corp. + */ + +#include +#include +#include +#include + +struct clk_div_table; +struct regmap; + +/** + * struct aspeed_gate_data - Aspeed gated clocks + * @clock_idx: bit used to gate this clock in the clock register + * @reset_idx: bit used to reset this IP in the reset register. -1 if no + * reset is required when enabling the clock + * @name: the clock name + * @parent_name: the name of the parent clock + * @flags: standard clock framework flags + */ +struct aspeed_gate_data { + u8 clock_idx; + s8 reset_idx; + const char *name; + const char *parent_name; + unsigned long flags; +}; + +/** + * struct aspeed_clk_gate - Aspeed specific clk_gate structure + * @hw: handle between common and hardware-specific interfaces + * @reg: register controlling gate + * @clock_idx: bit used to gate this clock in the clock register + * @reset_idx: bit used to reset this IP in the reset register. -1 if no + * reset is required when enabling the clock + * @flags: hardware-specific flags + * @lock: register lock + * + * Some of the clocks in the Aspeed SoC must be put in reset before enabling. + * This modified version of clk_gate allows an optional reset bit to be + * specified. + */ +struct aspeed_clk_gate { + struct clk_hw hw; + struct regmap *map; + u8 clock_idx; + s8 reset_idx; + u8 flags; + spinlock_t *lock; +}; + +#define to_aspeed_clk_gate(_hw) container_of(_hw, struct aspeed_clk_gate, hw) + +/** + * struct aspeed_reset - Aspeed reset controller + * @map: regmap to access the containing system controller + * @rcdev: reset controller device + */ +struct aspeed_reset { + struct regmap *map; + struct reset_controller_dev rcdev; +}; + +#define to_aspeed_reset(p) container_of((p), struct aspeed_reset, rcdev) + +/** + * struct aspeed_clk_soc_data - Aspeed SoC specific divisor information + * @div_table: Common divider lookup table + * @eclk_div_table: Divider lookup table for ECLK + * @mac_div_table: Divider lookup table for MAC (Ethernet) clocks + * @calc_pll: Callback to maculate common PLL settings + */ +struct aspeed_clk_soc_data { + const struct clk_div_table *div_table; + const struct clk_div_table *eclk_div_table; + const struct clk_div_table *mac_div_table; + struct clk_hw *(*calc_pll)(const char *name, u32 val); +}; -- cgit v1.3.1