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Subject[PATCH 22/32] x86/intel_rdt_rdtgroup.h: Header for user interface
Date
From: Fenghua Yu <fenghua.yu@intel.com>

This is header file for user interface file intel_rdt_rdtgroup.c.

Signed-off-by: Fenghua Yu <fenghua.yu@intel.com>
Reviewed-by: Tony Luck <tony.luck@intel.com>
---
arch/x86/include/asm/intel_rdt_rdtgroup.h | 226 ++++++++++++++++++++++++++++++
1 file changed, 226 insertions(+)
create mode 100644 arch/x86/include/asm/intel_rdt_rdtgroup.h

diff --git a/arch/x86/include/asm/intel_rdt_rdtgroup.h b/arch/x86/include/asm/intel_rdt_rdtgroup.h
new file mode 100644
index 0000000..797fed3
--- /dev/null
+++ b/arch/x86/include/asm/intel_rdt_rdtgroup.h
@@ -0,0 +1,226 @@
+#ifndef _RDT_PGROUP_H
+#define _RDT_PGROUP_H
+#define MAX_RDTGROUP_TYPE_NAMELEN 32
+#define MAX_RDTGROUP_ROOT_NAMELEN 64
+#define MAX_RFTYPE_NAME 64
+
+#include <asm/intel_rdt.h>
+
+extern void rdtgroup_exit(struct task_struct *tsk);
+
+struct pss_set {
+ void *self;
+ /*
+ * Lists running through all tasks using this rdtgroup.
+ */
+ struct list_head tasks;
+
+ /* all css_task_iters currently walking this cset */
+ struct list_head task_iters;
+
+ /* Reference count */
+ atomic_t refcount;
+};
+
+/* cftype->flags */
+enum {
+ RFTYPE_WORLD_WRITABLE = (1 << 4),/* (DON'T USE FOR NEW FILES) S_IWUGO */
+
+ /* internal flags, do not use outside rdtgroup core proper */
+ __RFTYPE_ONLY_ON_DFL = (1 << 16),/* only on default hierarchy */
+ __RFTYPE_NOT_ON_DFL = (1 << 17),/* not on default hierarchy */
+};
+
+/* bits in struct rdtgroup flags field */
+enum {
+ /* rdtroup requires release notifications to userspace */
+ RDTGRP_NOTIFY_ON_RELEASE,
+ /*
+ * Clone the parent's configuration when creating a new child
+ * cpuset rdtgroup. For historical reasons, this option can be
+ * specified at mount time and thus is implemented here.
+ */
+ RDTGRP_CPUSET_CLONE_CHILDREN,
+};
+
+#define CACHE_LEVEL3 3
+
+struct cache_resource {
+ u64 *cbm;
+ u64 *cbm2;
+ int *closid;
+ int *refcnt;
+};
+
+struct rdt_resource {
+ bool valid;
+ int closid[MAX_CACHE_DOMAINS];
+ /* Add more resources here. */
+};
+
+struct rdtgroup {
+ unsigned long flags; /* "unsigned long" so bitops work */
+
+ /*
+ * idr allocated in-hierarchy ID.
+ *
+ * ID 0 is not used, the ID of the root rdtgroup is always 1, and a
+ * new rdtgroup will be assigned with a smallest available ID.
+ *
+ * Allocating/Removing ID must be protected by rdtgroup_mutex.
+ */
+ int id;
+
+ /*
+ * The depth this rdtgroup is at. The root is at depth zero and each
+ * step down the hierarchy increments the level. This along with
+ * ancestor_ids[] can determine whether a given rdtgroup is a
+ * descendant of another without traversing the hierarchy.
+ */
+ int level;
+
+ /*
+ * Each non-empty css_set associated with this rdtgroup contributes
+ * one to populated_cnt. All children with non-zero popuplated_cnt
+ * of their own contribute one. The count is zero iff there's no
+ * task in this rdtgroup or its subtree.
+ */
+ int populated_cnt;
+
+ struct kernfs_node *kn; /* rdtgroup kernfs entry */
+
+ struct rdtgroup_root *root;
+
+ struct list_head rdtgroup_list;
+
+ struct pss_set pset;
+ struct cpumask cpu_mask;
+ char schema[1024];
+
+ /* used to wait for offlining of csses */
+ wait_queue_head_t offline_waitq;
+
+ struct rdt_resource resource;
+
+ /* ids of the ancestors at each level including self */
+ int ancestor_ids[];
+};
+
+struct rftype {
+ /*
+ * By convention, the name should begin with the name of the
+ * subsystem, followed by a period. Zero length string indicates
+ * end of cftype array.
+ */
+ char name[MAX_CFTYPE_NAME];
+ unsigned long private;
+
+ /*
+ * The maximum length of string, excluding trailing nul, that can
+ * be passed to write. If < PAGE_SIZE-1, PAGE_SIZE-1 is assumed.
+ */
+ size_t max_write_len;
+
+ /* CFTYPE_* flags */
+ unsigned int flags;
+
+ /*
+ * If non-zero, should contain the offset from the start of css to
+ * a struct rdtgroup_file field. rdtgroup will record the handle of
+ * the created file into it. The recorded handle can be used as
+ * long as the containing css remains accessible.
+ */
+ unsigned int file_offset;
+
+ /*
+ * Fields used for internal bookkeeping. Initialized automatically
+ * during registration.
+ */
+ struct kernfs_ops *kf_ops;
+
+ /*
+ * read_u64() is a shortcut for the common case of returning a
+ * single integer. Use it in place of read()
+ */
+ u64 (*read_u64)(struct rftype *rft);
+ /*
+ * read_s64() is a signed version of read_u64()
+ */
+ s64 (*read_s64)(struct rftype *rft);
+
+ /* generic seq_file read interface */
+ int (*seq_show)(struct seq_file *sf, void *v);
+
+ /* optional ops, implement all or none */
+ void *(*seq_start)(struct seq_file *sf, loff_t *ppos);
+ void *(*seq_next)(struct seq_file *sf, void *v, loff_t *ppos);
+ void (*seq_stop)(struct seq_file *sf, void *v);
+
+ /*
+ * write_u64() is a shortcut for the common case of accepting
+ * a single integer (as parsed by simple_strtoull) from
+ * userspace. Use in place of write(); return 0 or error.
+ */
+ int (*write_u64)(struct rftype *rft, u64 val);
+ /*
+ * write_s64() is a signed version of write_u64()
+ */
+ int (*write_s64)(struct rftype *rft, s64 val);
+
+ /*
+ * write() is the generic write callback which maps directly to
+ * kernfs write operation and overrides all other operations.
+ * Maximum write size is determined by ->max_write_len. Use
+ * of_css/cft() to access the associated css and cft.
+ */
+ ssize_t (*write)(struct kernfs_open_file *of,
+ char *buf, size_t nbytes, loff_t off);
+};
+
+struct rdtgroup_root {
+ struct kernfs_root *kf_root;
+
+ /* Unique id for this hierarchy. */
+ int hierarchy_id;
+
+ /* The root rdtgroup. Root is destroyed on its release. */
+ struct rdtgroup rdtgrp;
+
+ /* for rdtgrp->ancestor_ids[0] */
+ int rdtgrp_ancestor_id_storage;
+
+ /* Number of rdtgroups in the hierarchy */
+ atomic_t nr_rdtgrps;
+
+ /* A list running through the active hierarchies */
+ struct list_head root_list;
+
+ /* Hierarchy-specific flags */
+ unsigned int flags;
+
+ /* IDs for rdtgroups in this hierarchy */
+ struct idr rdtgroup_idr;
+
+ /* The name for this hierarchy - may be empty */
+ char name[MAX_RDTGROUP_ROOT_NAMELEN];
+};
+
+/* no synchronization, the result can only be used as a hint */
+static inline bool rdtgroup_is_populated(struct rdtgroup *rdtgrp)
+{
+ return rdtgrp->populated_cnt;
+}
+
+/* cft/css accessors for cftype->write() operation */
+static inline struct rftype *of_rft(struct kernfs_open_file *of)
+{
+ return of->kn->priv;
+}
+
+/* cft/css accessors for cftype->seq_*() operations */
+static inline struct rftype *seq_rft(struct seq_file *seq)
+{
+ return of_rft(seq->private);
+}
+
+#endif
--
2.5.0
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