Merge branches 'expcb.2026.07.24a', 'misc.2026.07.30a', 'rcu-tasks.2026.07.30a', 'srcu.2026.08.11a' and 'torture.2026.08.14a' into HEADgrafted

Changes:

Make expedited grace periods expedite normal RCU callbacks

Miscellaneous fixes:
 * Improve diagnostic output with character task states.
 * Mark accesses to inform KCSAN of concurrency design.
 * Move from kmalloc() to kmalloc_obj().
 * Documentation updates.
 * Improve handling of RCU deferred quiescent states.
 * Clean up unused function arguments and structure fields.
 * Reduce show_rcu_gp_kthreads() stack space.

Tasks RCU updates:
 * Clean up after SRCU re-implementation of Tasks Trace RCU.
 * Mark accesses to inform KCSAN of concurrency design.
 * Add ->lazy_timer status to diagnostic output.
 * Remove an unnecessary memory barrier.
 * Fix a data race, courtesy of KCSAN.
 * Documentation updates.
 * Convert cond_resched_tasks_rcu_qs() from macro to static inline
   function.

SRCU updates:
 * Add Rust helpers for SRCU.
 * Avoid losing queued work at cleanup_srcu_struct() time.

Torture-test updates:
 * Preparation work for immediate RCU priority deboosting.
 * Test RCU readers from real interrupt handlers (as opposed to softirq).
 * Simplify code through use of cpumask_next_wrap().
 * Improve diagnostic output with character task states.
 * Add rcutorture.nwriters parameter to allow lightweight stall testing,
   and rcutorture.stall_only to make doing so easier.
 * Test an RCU Tasks Trace grace period implying an RCU grace period.
 * Make RCU Tasks Trace torturing track reader batches.
 * Fix a data race, courtesy of KCSAN.
 * Plug a shuffle_tmp_mask memory leak on kthread spawn failure.

1 files changed, 289 insertions, 0 deletions

diff --git a/include/soc/tegra/mc.h b/include/soc/tegra/mc.h
new file mode 100644
index 000000000..25d465d70
--- /dev/null
+++ b/include/soc/tegra/mc.h
@@ -0,0 +1,289 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Copyright (C) 2014-2026 NVIDIA Corporation
+ */
+
+#ifndef __SOC_TEGRA_MC_H__
+#define __SOC_TEGRA_MC_H__
+
+#include <linux/bits.h>
+#include <linux/debugfs.h>
+#include <linux/err.h>
+#include <linux/interconnect-provider.h>
+#include <linux/interrupt.h>
+#include <linux/irq.h>
+#include <linux/reset-controller.h>
+#include <linux/tegra-icc.h>
+#include <linux/types.h>
+
+struct clk;
+struct device;
+struct page;
+
+struct tegra_mc_timing {
+	unsigned long rate;
+
+	u32 *emem_data;
+};
+
+struct tegra_mc_client {
+	unsigned int id;
+	unsigned int bpmp_id;
+	enum tegra_icc_client_type type;
+	const char *name;
+	/*
+	 * For Tegra210 and earlier, this is the SWGROUP ID used for IOVA translations in the
+	 * Tegra SMMU, whereas on Tegra186 and later this is the ID used to override the ARM SMMU
+	 * stream ID used for IOVA translations for the given memory client.
+	 */
+	union {
+		unsigned int swgroup;
+		unsigned int sid;
+	};
+
+	unsigned int fifo_size;
+
+	struct {
+		/* Tegra SMMU enable (Tegra210 and earlier) */
+		struct {
+			unsigned int reg;
+			unsigned int bit;
+		} smmu;
+
+		/* latency allowance */
+		struct {
+			unsigned int reg;
+			unsigned int shift;
+			unsigned int mask;
+			unsigned int def;
+		} la;
+
+		/* stream ID overrides (Tegra186 and later) */
+		struct {
+			unsigned int override;
+			unsigned int security;
+		} sid;
+	} regs;
+};
+
+struct tegra_smmu_swgroup {
+	const char *name;
+	unsigned int swgroup;
+	unsigned int reg;
+};
+
+struct tegra_smmu_group_soc {
+	const char *name;
+	const unsigned int *swgroups;
+	unsigned int num_swgroups;
+};
+
+struct tegra_smmu_soc {
+	const struct tegra_mc_client *clients;
+	unsigned int num_clients;
+
+	const struct tegra_smmu_swgroup *swgroups;
+	unsigned int num_swgroups;
+
+	const struct tegra_smmu_group_soc *groups;
+	unsigned int num_groups;
+
+	bool supports_round_robin_arbitration;
+	bool supports_request_limit;
+
+	unsigned int num_tlb_lines;
+	unsigned int num_asids;
+};
+
+struct tegra_mc;
+struct tegra_smmu;
+
+#ifdef CONFIG_TEGRA_IOMMU_SMMU
+struct tegra_smmu *tegra_smmu_probe(struct device *dev,
+				    const struct tegra_smmu_soc *soc,
+				    struct tegra_mc *mc);
+void tegra_smmu_remove(struct tegra_smmu *smmu);
+#else
+static inline struct tegra_smmu *
+tegra_smmu_probe(struct device *dev, const struct tegra_smmu_soc *soc,
+		 struct tegra_mc *mc)
+{
+	return NULL;
+}
+
+static inline void tegra_smmu_remove(struct tegra_smmu *smmu)
+{
+}
+#endif
+
+struct tegra_mc_reset {
+	const char *name;
+	unsigned long id;
+	unsigned int control;
+	unsigned int status;
+	unsigned int reset;
+	unsigned int bit;
+};
+
+struct tegra_mc_reset_ops {
+	int (*hotreset_assert)(struct tegra_mc *mc,
+			       const struct tegra_mc_reset *rst);
+	int (*hotreset_deassert)(struct tegra_mc *mc,
+				 const struct tegra_mc_reset *rst);
+	int (*block_dma)(struct tegra_mc *mc,
+			 const struct tegra_mc_reset *rst);
+	bool (*dma_idling)(struct tegra_mc *mc,
+			   const struct tegra_mc_reset *rst);
+	int (*unblock_dma)(struct tegra_mc *mc,
+			   const struct tegra_mc_reset *rst);
+	int (*reset_status)(struct tegra_mc *mc,
+			    const struct tegra_mc_reset *rst);
+};
+
+#define TEGRA_MC_ICC_TAG_DEFAULT				0
+#define TEGRA_MC_ICC_TAG_ISO					BIT(0)
+
+struct tegra_mc_icc_ops {
+	int (*set)(struct icc_node *src, struct icc_node *dst);
+	int (*aggregate)(struct icc_node *node, u32 tag, u32 avg_bw,
+			 u32 peak_bw, u32 *agg_avg, u32 *agg_peak);
+	struct icc_node* (*xlate)(const struct of_phandle_args *spec, void *data);
+	struct icc_node_data *(*xlate_extended)(const struct of_phandle_args *spec,
+						void *data);
+	int (*get_bw)(struct icc_node *node, u32 *avg, u32 *peak);
+};
+
+struct icc_node *tegra_mc_icc_xlate(const struct of_phandle_args *spec,
+				    void *data);
+extern const struct tegra_mc_icc_ops tegra_mc_icc_ops;
+
+struct tegra_mc_ops {
+	/*
+	 * @probe: Callback to set up SoC-specific bits of the memory controller. This is called
+	 * after basic, common set up that is done by the SoC-agnostic bits.
+	 */
+	int (*probe)(struct tegra_mc *mc);
+	void (*remove)(struct tegra_mc *mc);
+	void (*resume)(struct tegra_mc *mc);
+	int (*probe_device)(struct tegra_mc *mc, struct device *dev);
+};
+
+struct tegra_mc_regs {
+	unsigned int cfg_channel_enable;
+	unsigned int err_status;
+	unsigned int err_add;
+	unsigned int err_add_hi;
+	unsigned int err_vpr_status;
+	unsigned int err_vpr_add;
+	unsigned int err_sec_status;
+	unsigned int err_sec_add;
+	unsigned int err_mts_status;
+	unsigned int err_mts_add;
+	unsigned int err_gen_co_status;
+	unsigned int err_gen_co_add;
+	unsigned int err_route_status;
+	unsigned int err_route_add;
+};
+
+struct tegra_mc_intmask {
+	u32 reg;
+	u32 mask;
+};
+
+struct tegra_mc_soc {
+	const struct tegra_mc_client *clients;
+	unsigned int num_clients;
+
+	const unsigned long *emem_regs;
+	unsigned int num_emem_regs;
+
+	unsigned int num_address_bits;
+	unsigned int atom_size;
+
+	unsigned int num_carveouts;
+
+	u16 client_id_mask;
+	u8 num_channels;
+
+	const struct tegra_smmu_soc *smmu;
+
+	u32 ch_intmask;
+	u32 global_intstatus_channel_shift;
+	bool has_addr_hi_reg;
+
+	const struct tegra_mc_reset_ops *reset_ops;
+	const struct tegra_mc_reset *resets;
+	unsigned int num_resets;
+
+	const struct tegra_mc_icc_ops *icc_ops;
+	const struct tegra_mc_ops *ops;
+	const struct tegra_mc_regs *regs;
+
+	const irq_handler_t *handle_irq;
+	unsigned int num_interrupts;
+	unsigned int mc_addr_hi_mask;
+	unsigned int mc_err_status_type_mask;
+	const struct tegra_mc_intmask *intmasks;
+	unsigned int num_intmasks;
+};
+
+struct tegra_mc {
+	struct tegra_bpmp *bpmp;
+	struct device *dev;
+	struct tegra_smmu *smmu;
+	void __iomem *regs;
+	void __iomem *bcast_ch_regs;
+	void __iomem **ch_regs;
+	struct clk *clk;
+
+	const struct tegra_mc_soc *soc;
+	unsigned long tick;
+
+	struct tegra_mc_timing *timings;
+	unsigned int num_timings;
+	unsigned int num_channels;
+
+	bool bwmgr_mrq_supported;
+	struct reset_controller_dev reset;
+
+	struct icc_provider provider;
+
+	spinlock_t lock;
+
+	struct {
+		struct dentry *root;
+	} debugfs;
+};
+
+int tegra_mc_write_emem_configuration(struct tegra_mc *mc, unsigned long rate);
+unsigned int tegra_mc_get_emem_device_count(struct tegra_mc *mc);
+
+#ifdef CONFIG_TEGRA_MC
+struct tegra_mc *devm_tegra_memory_controller_get(struct device *dev);
+int tegra_mc_probe_device(struct tegra_mc *mc, struct device *dev);
+int tegra_mc_get_carveout_info(struct tegra_mc *mc, unsigned int id,
+                               phys_addr_t *base, u64 *size);
+#else
+static inline struct tegra_mc *
+devm_tegra_memory_controller_get(struct device *dev)
+{
+	return ERR_PTR(-ENODEV);
+}
+
+static inline int
+tegra_mc_probe_device(struct tegra_mc *mc, struct device *dev)
+{
+	return -ENODEV;
+}
+
+static inline int
+tegra_mc_get_carveout_info(struct tegra_mc *mc, unsigned int id,
+                           phys_addr_t *base, u64 *size)
+{
+	return -ENODEV;
+}
+#endif
+
+extern const struct tegra_mc_regs tegra20_mc_regs;
+
+#endif /* __SOC_TEGRA_MC_H__ */