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Date:      Sat, 18 Mar 2017 18:38:13 +0000 (UTC)
From:      Dmitry Chagin <dchagin@FreeBSD.org>
To:        src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org
Subject:   svn commit: r315506 - head/sys/compat/linsysfs
Message-ID:  <201703181838.v2IIcDGQ075586@repo.freebsd.org>
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Author: dchagin
Date: Sat Mar 18 18:38:12 2017
New Revision: 315506
URL: https://svnweb.freebsd.org/changeset/base/315506

Log:
  Glibc get_nprocs() and get_nprocs_conf() uses the sysfs cpu infrastructure
  to get number of processors. Implement /sys/devices/system/cpu/.
  
  MFC after:	1 month

Modified:
  head/sys/compat/linsysfs/linsysfs.c

Modified: head/sys/compat/linsysfs/linsysfs.c
==============================================================================
--- head/sys/compat/linsysfs/linsysfs.c	Sat Mar 18 18:34:29 2017	(r315505)
+++ head/sys/compat/linsysfs/linsysfs.c	Sat Mar 18 18:38:12 2017	(r315506)
@@ -221,13 +221,62 @@ linsysfs_run_bus(device_t dev, struct pf
 }
 
 /*
+ * Filler function for sys/devices/system/cpu/online
+ */
+static int
+linsysfs_cpuonline(PFS_FILL_ARGS)
+{
+
+	sbuf_printf(sb, "%d-%d\n", CPU_FIRST(), mp_maxid);
+	return (0);
+}
+
+/*
+ * Filler function for sys/devices/system/cpu/cpuX/online
+ */
+static int
+linsysfs_cpuxonline(PFS_FILL_ARGS)
+{
+
+	sbuf_printf(sb, "1\n");
+	return (0);
+}
+
+static void
+linsysfs_listcpus(struct pfs_node *dir)
+{
+	struct pfs_node *cpu;
+	char *name;
+	int i, count, len;
+
+	len = 1;
+	count = mp_maxcpus;
+	while (count > 10) {
+		count /= 10;
+		len++;
+	}
+	len += sizeof("cpu");
+	name = malloc(len, M_TEMP, M_WAITOK);
+
+	for (i = 0; i < mp_ncpus; ++i) {
+		/* /sys/devices/system/cpu/cpuX */
+		sprintf(name, "cpu%d", i);
+		cpu = pfs_create_dir(dir, name, NULL, NULL, NULL, 0);
+
+		pfs_create_file(cpu, "online", &linsysfs_cpuxonline,
+		    NULL, NULL, NULL, PFS_RD);
+	}
+	free(name, M_TEMP);
+}
+
+/*
  * Constructor
  */
 static int
 linsysfs_init(PFS_INIT_ARGS)
 {
 	struct pfs_node *root;
-	struct pfs_node *dir;
+	struct pfs_node *dir, *sys, *cpu;
 	struct pfs_node *pci;
 	struct pfs_node *scsi;
 	devclass_t devclass;
@@ -241,10 +290,10 @@ linsysfs_init(PFS_INIT_ARGS)
 	scsi = pfs_create_dir(root, "class", NULL, NULL, NULL, 0);
 	scsi = pfs_create_dir(scsi, "scsi_host", NULL, NULL, NULL, 0);
 
-	/* /sys/device */
+	/* /sys/devices */
 	dir = pfs_create_dir(root, "devices", NULL, NULL, NULL, 0);
 
-	/* /sys/device/pci0000:00 */
+	/* /sys/devices/pci0000:00 */
 	pci = pfs_create_dir(dir, "pci0000:00", NULL, NULL, NULL, 0);
 
 	devclass = devclass_find("root");
@@ -254,6 +303,18 @@ linsysfs_init(PFS_INIT_ARGS)
 
 	dev = devclass_get_device(devclass, 0);
 	linsysfs_run_bus(dev, pci, scsi, "/pci0000:00", "0000");
+
+	/* /sys/devices/system */
+	sys = pfs_create_dir(dir, "system", NULL, NULL, NULL, 0);
+
+	/* /sys/devices/system/cpu */
+	cpu = pfs_create_dir(sys, "cpu", NULL, NULL, NULL, 0);
+
+	pfs_create_file(cpu, "online", &linsysfs_cpuonline,
+	    NULL, NULL, NULL, PFS_RD);
+
+	linsysfs_listcpus(cpu);
+
 	return (0);
 }

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