From: Juergen Gross <jgross@suse.com>
To: xen-devel@lists.xenproject.org
Cc: Juergen Gross <jgross@suse.com>,
Andrew Cooper <andrew.cooper3@citrix.com>,
George Dunlap <george.dunlap@citrix.com>,
Ian Jackson <iwj@xenproject.org>, Jan Beulich <jbeulich@suse.com>,
Julien Grall <julien@xen.org>,
Stefano Stabellini <sstabellini@kernel.org>, Wei Liu <wl@xen.org>,
Dario Faggioli <dfaggioli@suse.com>
Subject: [PATCH v2 15/17] xen/cpupool: add cpupool directories
Date: Tue, 1 Dec 2020 09:21:26 +0100 [thread overview]
Message-ID: <20201201082128.15239-16-jgross@suse.com> (raw)
In-Reply-To: <20201201082128.15239-1-jgross@suse.com>
Add /cpupool/<cpupool-id> directories to hypfs. Those are completely
dynamic, so the related hypfs access functions need to be implemented.
Signed-off-by: Juergen Gross <jgross@suse.com>
---
V2:
- added const (Jan Beulich)
- call hypfs_add_dir() in helper (Dario Faggioli)
- switch locking to enter/exit callbacks
---
docs/misc/hypfs-paths.pandoc | 9 +++
xen/common/sched/cpupool.c | 122 +++++++++++++++++++++++++++++++++++
2 files changed, 131 insertions(+)
diff --git a/docs/misc/hypfs-paths.pandoc b/docs/misc/hypfs-paths.pandoc
index 6c7b2f7ee3..aaca1cdf92 100644
--- a/docs/misc/hypfs-paths.pandoc
+++ b/docs/misc/hypfs-paths.pandoc
@@ -175,6 +175,15 @@ The major version of Xen.
The minor version of Xen.
+#### /cpupool/
+
+A directory of all current cpupools.
+
+#### /cpupool/*/
+
+The individual cpupools. Each entry is a directory with the name being the
+cpupool-id (e.g. /cpupool/0/).
+
#### /params/
A directory of runtime parameters.
diff --git a/xen/common/sched/cpupool.c b/xen/common/sched/cpupool.c
index 0db7d77219..3e17fdf95b 100644
--- a/xen/common/sched/cpupool.c
+++ b/xen/common/sched/cpupool.c
@@ -13,6 +13,8 @@
#include <xen/cpu.h>
#include <xen/cpumask.h>
+#include <xen/guest_access.h>
+#include <xen/hypfs.h>
#include <xen/init.h>
#include <xen/keyhandler.h>
#include <xen/lib.h>
@@ -33,6 +35,7 @@ static int cpupool_moving_cpu = -1;
static struct cpupool *cpupool_cpu_moving = NULL;
static cpumask_t cpupool_locked_cpus;
+/* This lock nests inside sysctl or hypfs lock. */
static DEFINE_SPINLOCK(cpupool_lock);
static enum sched_gran __read_mostly opt_sched_granularity = SCHED_GRAN_cpu;
@@ -1003,12 +1006,131 @@ static struct notifier_block cpu_nfb = {
.notifier_call = cpu_callback
};
+#ifdef CONFIG_HYPFS
+static const struct hypfs_entry *cpupool_pooldir_enter(
+ const struct hypfs_entry *entry);
+
+static struct hypfs_funcs cpupool_pooldir_funcs = {
+ .enter = cpupool_pooldir_enter,
+ .exit = hypfs_node_exit,
+ .read = hypfs_read_dir,
+ .write = hypfs_write_deny,
+ .getsize = hypfs_getsize,
+ .findentry = hypfs_dir_findentry,
+};
+
+static HYPFS_VARDIR_INIT(cpupool_pooldir, "%u", &cpupool_pooldir_funcs);
+
+static const struct hypfs_entry *cpupool_pooldir_enter(
+ const struct hypfs_entry *entry)
+{
+ return &cpupool_pooldir.e;
+}
+
+static int cpupool_dir_read(const struct hypfs_entry *entry,
+ XEN_GUEST_HANDLE_PARAM(void) uaddr)
+{
+ int ret = 0;
+ const struct cpupool *c;
+ unsigned int size = 0;
+
+ list_for_each_entry(c, &cpupool_list, list)
+ {
+ size += hypfs_dynid_entry_size(entry, c->cpupool_id);
+
+ ret = hypfs_read_dyndir_id_entry(&cpupool_pooldir, c->cpupool_id,
+ list_is_last(&c->list, &cpupool_list),
+ &uaddr);
+ if ( ret )
+ break;
+ }
+
+ return ret;
+}
+
+static unsigned int cpupool_dir_getsize(const struct hypfs_entry *entry)
+{
+ const struct cpupool *c;
+ unsigned int size = 0;
+
+ list_for_each_entry(c, &cpupool_list, list)
+ size += hypfs_dynid_entry_size(entry, c->cpupool_id);
+
+ return size;
+}
+
+static const struct hypfs_entry *cpupool_dir_enter(
+ const struct hypfs_entry *entry)
+{
+ struct hypfs_dyndir_id *data;
+
+ data = hypfs_alloc_dyndata(sizeof(*data));
+ if ( !data )
+ return ERR_PTR(-ENOMEM);
+ data->id = CPUPOOLID_NONE;
+
+ spin_lock(&cpupool_lock);
+
+ return entry;
+}
+
+static void cpupool_dir_exit(const struct hypfs_entry *entry)
+{
+ spin_unlock(&cpupool_lock);
+
+ hypfs_free_dyndata();
+}
+
+static struct hypfs_entry *cpupool_dir_findentry(
+ const struct hypfs_entry_dir *dir, const char *name, unsigned int name_len)
+{
+ unsigned long id;
+ const char *end;
+ const struct cpupool *cpupool;
+
+ id = simple_strtoul(name, &end, 10);
+ if ( end != name + name_len )
+ return ERR_PTR(-ENOENT);
+
+ cpupool = __cpupool_find_by_id(id, true);
+
+ if ( !cpupool )
+ return ERR_PTR(-ENOENT);
+
+ return hypfs_gen_dyndir_entry_id(&cpupool_pooldir, id);
+}
+
+static struct hypfs_funcs cpupool_dir_funcs = {
+ .enter = cpupool_dir_enter,
+ .exit = cpupool_dir_exit,
+ .read = cpupool_dir_read,
+ .write = hypfs_write_deny,
+ .getsize = cpupool_dir_getsize,
+ .findentry = cpupool_dir_findentry,
+};
+
+static HYPFS_VARDIR_INIT(cpupool_dir, "cpupool", &cpupool_dir_funcs);
+
+static void cpupool_hypfs_init(void)
+{
+ hypfs_add_dir(&hypfs_root, &cpupool_dir, true);
+ hypfs_add_dyndir(&cpupool_dir, &cpupool_pooldir);
+}
+#else
+
+static void cpupool_hypfs_init(void)
+{
+}
+#endif
+
static int __init cpupool_init(void)
{
unsigned int cpu;
cpupool_gran_init();
+ cpupool_hypfs_init();
+
cpupool0 = cpupool_create(0, 0);
BUG_ON(IS_ERR(cpupool0));
cpupool_put(cpupool0);
--
2.26.2
next prev parent reply other threads:[~2020-12-01 8:22 UTC|newest]
Thread overview: 73+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-12-01 8:21 [PATCH v2 00/17] xen: support per-cpupool scheduling granularity Juergen Gross
2020-12-01 8:21 ` [PATCH v2 01/17] xen/cpupool: add cpu to sched_res_mask when removing it from cpupool Juergen Gross
2020-12-01 8:21 ` [PATCH v2 02/17] xen/cpupool: add missing bits for per-cpupool scheduling granularity Juergen Gross
2020-12-01 8:21 ` [PATCH v2 03/17] xen/cpupool: sort included headers in cpupool.c Juergen Gross
2020-12-01 8:21 ` [PATCH v2 04/17] xen/cpupool: switch cpupool id to unsigned Juergen Gross
2020-12-01 8:55 ` Jan Beulich
2020-12-01 9:01 ` Jürgen Groß
2020-12-01 9:07 ` Jan Beulich
2020-12-07 9:59 ` Jan Beulich
2020-12-07 14:48 ` Jürgen Groß
2020-12-07 15:00 ` Jan Beulich
2020-12-04 15:52 ` Dario Faggioli
2020-12-07 9:58 ` Jan Beulich
2020-12-07 15:21 ` Jan Beulich
2020-12-01 8:21 ` [PATCH v2 05/17] xen/cpupool: switch cpupool list to normal list interface Juergen Gross
2020-12-01 9:12 ` Jan Beulich
2020-12-01 9:18 ` Jürgen Groß
2020-12-04 16:13 ` Dario Faggioli
2020-12-04 16:16 ` Jürgen Groß
2020-12-04 16:25 ` Dario Faggioli
2020-12-04 16:56 ` Dario Faggioli
2020-12-01 8:21 ` [PATCH v2 06/17] xen/cpupool: use ERR_PTR() for returning error cause from cpupool_create() Juergen Gross
2020-12-02 8:58 ` Jan Beulich
2020-12-02 9:56 ` Jürgen Groß
2020-12-02 10:46 ` Jan Beulich
2020-12-02 10:58 ` Jürgen Groß
2020-12-04 16:29 ` Dario Faggioli
2020-12-01 8:21 ` [PATCH v2 07/17] xen/cpupool: support moving domain between cpupools with different granularity Juergen Gross
2020-12-01 8:21 ` [PATCH v2 08/17] docs: fix hypfs path documentation Juergen Gross
2020-12-01 8:21 ` [PATCH v2 09/17] xen/hypfs: move per-node function pointers into a dedicated struct Juergen Gross
2020-12-02 15:36 ` Jan Beulich
2020-12-02 15:41 ` Jürgen Groß
2020-12-03 8:47 ` Jürgen Groß
2020-12-03 9:12 ` Jan Beulich
2020-12-03 9:51 ` Jürgen Groß
2020-12-01 8:21 ` [PATCH v2 10/17] xen/hypfs: pass real failure reason up from hypfs_get_entry() Juergen Gross
2020-12-01 8:21 ` [PATCH v2 11/17] xen/hypfs: add getsize() and findentry() callbacks to hypfs_funcs Juergen Gross
2020-12-02 15:42 ` Jan Beulich
2020-12-02 15:51 ` Jürgen Groß
2020-12-03 8:12 ` Jan Beulich
2020-12-03 9:39 ` Jürgen Groß
2020-12-04 8:58 ` Jan Beulich
2020-12-04 11:14 ` Jürgen Groß
2020-12-01 8:21 ` [PATCH v2 12/17] xen/hypfs: add new enter() and exit() per node callbacks Juergen Gross
2020-12-03 14:59 ` Jan Beulich
2020-12-03 15:14 ` Jürgen Groß
2020-12-03 15:29 ` Jan Beulich
2020-12-04 8:33 ` Jürgen Groß
2020-12-04 8:30 ` Jan Beulich
2020-12-04 8:35 ` Jürgen Groß
2020-12-01 8:21 ` [PATCH v2 13/17] xen/hypfs: support dynamic hypfs nodes Juergen Gross
2020-12-03 15:08 ` Jan Beulich
2020-12-03 15:18 ` Jürgen Groß
2020-12-01 8:21 ` [PATCH v2 14/17] xen/hypfs: add support for id-based dynamic directories Juergen Gross
2020-12-03 15:44 ` Jan Beulich
2020-12-04 8:52 ` Jürgen Groß
2020-12-04 9:16 ` Jan Beulich
2020-12-04 13:08 ` Jürgen Groß
2020-12-07 7:54 ` Jan Beulich
2020-12-01 8:21 ` Juergen Gross [this message]
2020-12-01 9:00 ` [PATCH v2 15/17] xen/cpupool: add cpupool directories Jan Beulich
2020-12-01 9:03 ` Jürgen Groß
2020-12-02 15:46 ` Jürgen Groß
2020-12-03 14:46 ` Jan Beulich
2020-12-03 15:11 ` Jürgen Groß
2020-12-04 9:10 ` Jan Beulich
2020-12-04 11:08 ` Jürgen Groß
2020-12-04 11:54 ` Jan Beulich
2020-12-01 8:21 ` [PATCH v2 16/17] xen/cpupool: add scheduling granularity entry to cpupool entries Juergen Gross
2020-12-01 8:21 ` [PATCH v2 17/17] xen/cpupool: make per-cpupool sched-gran hypfs node writable Juergen Gross
2020-12-04 23:53 ` [PATCH v2 00/17] xen: support per-cpupool scheduling granularity Andrew Cooper
2020-12-05 7:41 ` Jürgen Groß
2020-12-07 9:00 ` Jan Beulich
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