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plugins: define qemu_plugin_u64

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Additionally to the scoreboard, we define a qemu_plugin_u64, which is a
simple struct holding a pointer to a scoreboard, and a given offset.
This allows to have a scoreboard containing structs, without having to
bring offset to operate on a specific field.

Since most of the plugins are simply collecting a sum of per-cpu values,
qemu_plugin_u64 directly support this operation as well.

All inline operations defined later will use a qemu_plugin_u64 as input.

New functions:
- qemu_plugin_u64_add
- qemu_plugin_u64_get
- qemu_plugin_u64_set
- qemu_plugin_u64_sum
New macros:
- qemu_plugin_scoreboard_u64
- qemu_plugin_scoreboard_u64_in_struct

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Pierrick Bouvier <pierrick.bouvier@linaro.org>
Message-Id: <20240304130036.124418-3-pierrick.bouvier@linaro.org>
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Message-Id: <20240305121005.3528075-16-alex.bennee@linaro.org>
This commit is contained in:
Pierrick Bouvier 2024-03-05 12:09:51 +00:00 • committed by Alex Bennée
parent a3c2cf0b89
commit 8042e2eadf
3 changed files with 90 additions and 0 deletions
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52
include/qemu/qemu-plugin.h
View file

@ -225,6 +225,17 @@ struct qemu_plugin_insn;
/** struct qemu_plugin_scoreboard - Opaque handle for a scoreboard */
struct qemu_plugin_scoreboard;
/**
* typedef qemu_plugin_u64 - uint64_t member of an entry in a scoreboard
*
* This field allows to access a specific uint64_t member in one given entry,
* located at a specified offset. Inline operations expect this as entry.
*/
typedef struct {
struct qemu_plugin_scoreboard *score;
size_t offset;
} qemu_plugin_u64;
/**
* enum qemu_plugin_cb_flags - type of callback
*
@ -784,4 +795,45 @@ QEMU_PLUGIN_API
void *qemu_plugin_scoreboard_find(struct qemu_plugin_scoreboard *score,
unsigned int vcpu_index);
/* Macros to define a qemu_plugin_u64 */
#define qemu_plugin_scoreboard_u64(score) \
(qemu_plugin_u64) {score, 0}
#define qemu_plugin_scoreboard_u64_in_struct(score, type, member) \
(qemu_plugin_u64) {score, offsetof(type, member)}
/**
* qemu_plugin_u64_add() - add a value to a qemu_plugin_u64 for a given vcpu
* @entry: entry to query
* @vcpu_index: entry index
* @added: value to add
*/
QEMU_PLUGIN_API
void qemu_plugin_u64_add(qemu_plugin_u64 entry, unsigned int vcpu_index,
uint64_t added);
/**
* qemu_plugin_u64_get() - get value of a qemu_plugin_u64 for a given vcpu
* @entry: entry to query
* @vcpu_index: entry index
*/
QEMU_PLUGIN_API
uint64_t qemu_plugin_u64_get(qemu_plugin_u64 entry, unsigned int vcpu_index);
/**
* qemu_plugin_u64_set() - set value of a qemu_plugin_u64 for a given vcpu
* @entry: entry to query
* @vcpu_index: entry index
* @val: new value
*/
QEMU_PLUGIN_API
void qemu_plugin_u64_set(qemu_plugin_u64 entry, unsigned int vcpu_index,
uint64_t val);
/**
* qemu_plugin_u64_sum() - return sum of all vcpu entries in a scoreboard
* @entry: entry to sum
*/
QEMU_PLUGIN_API
uint64_t qemu_plugin_u64_sum(qemu_plugin_u64 entry);
#endif /* QEMU_QEMU_PLUGIN_H */