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authorYunhong Jiang <yunhong.jiang@intel.com>2015-08-04 12:17:53 -0700
committerYunhong Jiang <yunhong.jiang@intel.com>2015-08-04 15:44:42 -0700
commit9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00 (patch)
tree1c9cafbcd35f783a87880a10f85d1a060db1a563 /kernel/arch/s390/hypfs/hypfs_diag0c.c
parent98260f3884f4a202f9ca5eabed40b1354c489b29 (diff)
Add the rt linux 4.1.3-rt3 as base
Import the rt linux 4.1.3-rt3 as OPNFV kvm base. It's from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt and the base is: commit 0917f823c59692d751951bf5ea699a2d1e2f26a2 Author: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Date: Sat Jul 25 12:13:34 2015 +0200 Prepare v4.1.3-rt3 Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> We lose all the git history this way and it's not good. We should apply another opnfv project repo in future. Change-Id: I87543d81c9df70d99c5001fbdf646b202c19f423 Signed-off-by: Yunhong Jiang <yunhong.jiang@intel.com>
Diffstat (limited to 'kernel/arch/s390/hypfs/hypfs_diag0c.c')
-rw-r--r--kernel/arch/s390/hypfs/hypfs_diag0c.c135
1 files changed, 135 insertions, 0 deletions
diff --git a/kernel/arch/s390/hypfs/hypfs_diag0c.c b/kernel/arch/s390/hypfs/hypfs_diag0c.c
new file mode 100644
index 000000000..24c747a0f
--- /dev/null
+++ b/kernel/arch/s390/hypfs/hypfs_diag0c.c
@@ -0,0 +1,135 @@
+/*
+ * Hypervisor filesystem for Linux on s390
+ *
+ * Diag 0C implementation
+ *
+ * Copyright IBM Corp. 2014
+ */
+
+#include <linux/slab.h>
+#include <linux/cpu.h>
+#include <asm/hypfs.h>
+#include "hypfs.h"
+
+#define DBFS_D0C_HDR_VERSION 0
+
+/*
+ * Execute diagnose 0c in 31 bit mode
+ */
+static void diag0c(struct hypfs_diag0c_entry *entry)
+{
+ asm volatile (
+ " sam31\n"
+ " diag %0,%0,0x0c\n"
+ " sam64\n"
+ : /* no output register */
+ : "a" (entry)
+ : "memory");
+}
+
+/*
+ * Get hypfs_diag0c_entry from CPU vector and store diag0c data
+ */
+static void diag0c_fn(void *data)
+{
+ diag0c(((void **) data)[smp_processor_id()]);
+}
+
+/*
+ * Allocate buffer and store diag 0c data
+ */
+static void *diag0c_store(unsigned int *count)
+{
+ struct hypfs_diag0c_data *diag0c_data;
+ unsigned int cpu_count, cpu, i;
+ void **cpu_vec;
+
+ get_online_cpus();
+ cpu_count = num_online_cpus();
+ cpu_vec = kmalloc(sizeof(*cpu_vec) * num_possible_cpus(), GFP_KERNEL);
+ if (!cpu_vec)
+ goto fail_put_online_cpus;
+ /* Note: Diag 0c needs 8 byte alignment and real storage */
+ diag0c_data = kzalloc(sizeof(struct hypfs_diag0c_hdr) +
+ cpu_count * sizeof(struct hypfs_diag0c_entry),
+ GFP_KERNEL | GFP_DMA);
+ if (!diag0c_data)
+ goto fail_kfree_cpu_vec;
+ i = 0;
+ /* Fill CPU vector for each online CPU */
+ for_each_online_cpu(cpu) {
+ diag0c_data->entry[i].cpu = cpu;
+ cpu_vec[cpu] = &diag0c_data->entry[i++];
+ }
+ /* Collect data all CPUs */
+ on_each_cpu(diag0c_fn, cpu_vec, 1);
+ *count = cpu_count;
+ kfree(cpu_vec);
+ put_online_cpus();
+ return diag0c_data;
+
+fail_kfree_cpu_vec:
+ kfree(cpu_vec);
+fail_put_online_cpus:
+ put_online_cpus();
+ return ERR_PTR(-ENOMEM);
+}
+
+/*
+ * Hypfs DBFS callback: Free diag 0c data
+ */
+static void dbfs_diag0c_free(const void *data)
+{
+ kfree(data);
+}
+
+/*
+ * Hypfs DBFS callback: Create diag 0c data
+ */
+static int dbfs_diag0c_create(void **data, void **data_free_ptr, size_t *size)
+{
+ struct hypfs_diag0c_data *diag0c_data;
+ unsigned int count;
+
+ diag0c_data = diag0c_store(&count);
+ if (IS_ERR(diag0c_data))
+ return PTR_ERR(diag0c_data);
+ memset(&diag0c_data->hdr, 0, sizeof(diag0c_data->hdr));
+ get_tod_clock_ext(diag0c_data->hdr.tod_ext);
+ diag0c_data->hdr.len = count * sizeof(struct hypfs_diag0c_entry);
+ diag0c_data->hdr.version = DBFS_D0C_HDR_VERSION;
+ diag0c_data->hdr.count = count;
+ *data = diag0c_data;
+ *data_free_ptr = diag0c_data;
+ *size = diag0c_data->hdr.len + sizeof(struct hypfs_diag0c_hdr);
+ return 0;
+}
+
+/*
+ * Hypfs DBFS file structure
+ */
+static struct hypfs_dbfs_file dbfs_file_0c = {
+ .name = "diag_0c",
+ .data_create = dbfs_diag0c_create,
+ .data_free = dbfs_diag0c_free,
+};
+
+/*
+ * Initialize diag 0c interface for z/VM
+ */
+int __init hypfs_diag0c_init(void)
+{
+ if (!MACHINE_IS_VM)
+ return 0;
+ return hypfs_dbfs_create_file(&dbfs_file_0c);
+}
+
+/*
+ * Shutdown diag 0c interface for z/VM
+ */
+void hypfs_diag0c_exit(void)
+{
+ if (!MACHINE_IS_VM)
+ return;
+ hypfs_dbfs_remove_file(&dbfs_file_0c);
+}