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Vincent Donnefort
635923081c
Add load/unload callback used for each admitted page in the ring-buffer. This will be later useful for the pKVM hypervisor which uses a different VA space and need to dynamically map/unmap the ring-buffer pages. Link: https://patch.msgid.link/20260309162516.2623589-18-vdonnefort@google.com Reviewed-by: Steven Rostedt (Google) <rostedt@goodmis.org> Signed-off-by: Vincent Donnefort <vdonnefort@google.com> Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
66 lines
1.9 KiB
C
66 lines
1.9 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _LINUX_SIMPLE_RING_BUFFER_H
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#define _LINUX_SIMPLE_RING_BUFFER_H
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#include <linux/list.h>
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#include <linux/ring_buffer.h>
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#include <linux/ring_buffer_types.h>
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#include <linux/types.h>
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/*
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* Ideally those struct would stay private but the caller needs to know
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* the allocation size for simple_ring_buffer_init().
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*/
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struct simple_buffer_page {
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struct list_head link;
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struct buffer_data_page *page;
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u64 entries;
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u32 write;
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u32 id;
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};
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struct simple_rb_per_cpu {
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struct simple_buffer_page *tail_page;
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struct simple_buffer_page *reader_page;
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struct simple_buffer_page *head_page;
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struct simple_buffer_page *bpages;
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struct trace_buffer_meta *meta;
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u32 nr_pages;
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#define SIMPLE_RB_UNAVAILABLE 0
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#define SIMPLE_RB_READY 1
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#define SIMPLE_RB_WRITING 2
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u32 status;
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u64 last_overrun;
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u64 write_stamp;
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struct simple_rb_cbs *cbs;
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};
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int simple_ring_buffer_init(struct simple_rb_per_cpu *cpu_buffer, struct simple_buffer_page *bpages,
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const struct ring_buffer_desc *desc);
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void simple_ring_buffer_unload(struct simple_rb_per_cpu *cpu_buffer);
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void *simple_ring_buffer_reserve(struct simple_rb_per_cpu *cpu_buffer, unsigned long length,
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u64 timestamp);
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void simple_ring_buffer_commit(struct simple_rb_per_cpu *cpu_buffer);
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int simple_ring_buffer_enable_tracing(struct simple_rb_per_cpu *cpu_buffer, bool enable);
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int simple_ring_buffer_reset(struct simple_rb_per_cpu *cpu_buffer);
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int simple_ring_buffer_swap_reader_page(struct simple_rb_per_cpu *cpu_buffer);
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int simple_ring_buffer_init_mm(struct simple_rb_per_cpu *cpu_buffer,
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struct simple_buffer_page *bpages,
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const struct ring_buffer_desc *desc,
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void *(*load_page)(unsigned long va),
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void (*unload_page)(void *va));
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void simple_ring_buffer_unload_mm(struct simple_rb_per_cpu *cpu_buffer,
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void (*unload_page)(void *));
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#endif
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