Adding upstream version 4.19.249.upstream/4.19.249upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 274 insertions, 0 deletions

diff --git a/drivers/s390/char/vmcp.c b/drivers/s390/char/vmcp.c
new file mode 100644
index 000000000..0fa1b6b14
--- /dev/null
+++ b/drivers/s390/char/vmcp.c
@@ -0,0 +1,274 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright IBM Corp. 2004, 2010
+ * Interface implementation for communication with the z/VM control program
+ *
+ * Author(s): Christian Borntraeger <borntraeger@de.ibm.com>
+ *
+ * z/VMs CP offers the possibility to issue commands via the diagnose code 8
+ * this driver implements a character device that issues these commands and
+ * returns the answer of CP.
+ *
+ * The idea of this driver is based on cpint from Neale Ferguson and #CP in CMS
+ */
+
+#include <linux/fs.h>
+#include <linux/init.h>
+#include <linux/compat.h>
+#include <linux/kernel.h>
+#include <linux/miscdevice.h>
+#include <linux/slab.h>
+#include <linux/uaccess.h>
+#include <linux/export.h>
+#include <linux/mutex.h>
+#include <linux/cma.h>
+#include <linux/mm.h>
+#include <asm/cpcmd.h>
+#include <asm/debug.h>
+#include <asm/vmcp.h>
+
+struct vmcp_session {
+	char *response;
+	unsigned int bufsize;
+	unsigned int cma_alloc : 1;
+	int resp_size;
+	int resp_code;
+	struct mutex mutex;
+};
+
+static debug_info_t *vmcp_debug;
+
+static unsigned long vmcp_cma_size __initdata = CONFIG_VMCP_CMA_SIZE * 1024 * 1024;
+static struct cma *vmcp_cma;
+
+static int __init early_parse_vmcp_cma(char *p)
+{
+	vmcp_cma_size = ALIGN(memparse(p, NULL), PAGE_SIZE);
+	return 0;
+}
+early_param("vmcp_cma", early_parse_vmcp_cma);
+
+void __init vmcp_cma_reserve(void)
+{
+	if (!MACHINE_IS_VM)
+		return;
+	cma_declare_contiguous(0, vmcp_cma_size, 0, 0, 0, false, "vmcp", &vmcp_cma);
+}
+
+static void vmcp_response_alloc(struct vmcp_session *session)
+{
+	struct page *page = NULL;
+	int nr_pages, order;
+
+	order = get_order(session->bufsize);
+	nr_pages = ALIGN(session->bufsize, PAGE_SIZE) >> PAGE_SHIFT;
+	/*
+	 * For anything below order 3 allocations rely on the buddy
+	 * allocator. If such low-order allocations can't be handled
+	 * anymore the system won't work anyway.
+	 */
+	if (order > 2)
+		page = cma_alloc(vmcp_cma, nr_pages, 0, false);
+	if (page) {
+		session->response = (char *)page_to_phys(page);
+		session->cma_alloc = 1;
+		return;
+	}
+	session->response = (char *)__get_free_pages(GFP_KERNEL | __GFP_RETRY_MAYFAIL, order);
+}
+
+static void vmcp_response_free(struct vmcp_session *session)
+{
+	int nr_pages, order;
+	struct page *page;
+
+	if (!session->response)
+		return;
+	order = get_order(session->bufsize);
+	nr_pages = ALIGN(session->bufsize, PAGE_SIZE) >> PAGE_SHIFT;
+	if (session->cma_alloc) {
+		page = phys_to_page((unsigned long)session->response);
+		cma_release(vmcp_cma, page, nr_pages);
+		session->cma_alloc = 0;
+	} else {
+		free_pages((unsigned long)session->response, order);
+	}
+	session->response = NULL;
+}
+
+static int vmcp_open(struct inode *inode, struct file *file)
+{
+	struct vmcp_session *session;
+
+	if (!capable(CAP_SYS_ADMIN))
+		return -EPERM;
+
+	session = kmalloc(sizeof(*session), GFP_KERNEL);
+	if (!session)
+		return -ENOMEM;
+
+	session->bufsize = PAGE_SIZE;
+	session->response = NULL;
+	session->resp_size = 0;
+	mutex_init(&session->mutex);
+	file->private_data = session;
+	return nonseekable_open(inode, file);
+}
+
+static int vmcp_release(struct inode *inode, struct file *file)
+{
+	struct vmcp_session *session;
+
+	session = file->private_data;
+	file->private_data = NULL;
+	vmcp_response_free(session);
+	kfree(session);
+	return 0;
+}
+
+static ssize_t
+vmcp_read(struct file *file, char __user *buff, size_t count, loff_t *ppos)
+{
+	ssize_t ret;
+	size_t size;
+	struct vmcp_session *session;
+
+	session = file->private_data;
+	if (mutex_lock_interruptible(&session->mutex))
+		return -ERESTARTSYS;
+	if (!session->response) {
+		mutex_unlock(&session->mutex);
+		return 0;
+	}
+	size = min_t(size_t, session->resp_size, session->bufsize);
+	ret = simple_read_from_buffer(buff, count, ppos,
+					session->response, size);
+
+	mutex_unlock(&session->mutex);
+
+	return ret;
+}
+
+static ssize_t
+vmcp_write(struct file *file, const char __user *buff, size_t count,
+	   loff_t *ppos)
+{
+	char *cmd;
+	struct vmcp_session *session;
+
+	if (count > 240)
+		return -EINVAL;
+	cmd = memdup_user_nul(buff, count);
+	if (IS_ERR(cmd))
+		return PTR_ERR(cmd);
+	session = file->private_data;
+	if (mutex_lock_interruptible(&session->mutex)) {
+		kfree(cmd);
+		return -ERESTARTSYS;
+	}
+	if (!session->response)
+		vmcp_response_alloc(session);
+	if (!session->response) {
+		mutex_unlock(&session->mutex);
+		kfree(cmd);
+		return -ENOMEM;
+	}
+	debug_text_event(vmcp_debug, 1, cmd);
+	session->resp_size = cpcmd(cmd, session->response, session->bufsize,
+				   &session->resp_code);
+	mutex_unlock(&session->mutex);
+	kfree(cmd);
+	*ppos = 0;		/* reset the file pointer after a command */
+	return count;
+}
+
+
+/*
+ * These ioctls are available, as the semantics of the diagnose 8 call
+ * does not fit very well into a Linux call. Diagnose X'08' is described in
+ * CP Programming Services SC24-6084-00
+ *
+ * VMCP_GETCODE: gives the CP return code back to user space
+ * VMCP_SETBUF: sets the response buffer for the next write call. diagnose 8
+ * expects adjacent pages in real storage and to make matters worse, we
+ * dont know the size of the response. Therefore we default to PAGESIZE and
+ * let userspace to change the response size, if userspace expects a bigger
+ * response
+ */
+static long vmcp_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
+{
+	struct vmcp_session *session;
+	int ret = -ENOTTY;
+	int __user *argp;
+
+	session = file->private_data;
+	if (is_compat_task())
+		argp = compat_ptr(arg);
+	else
+		argp = (int __user *)arg;
+	if (mutex_lock_interruptible(&session->mutex))
+		return -ERESTARTSYS;
+	switch (cmd) {
+	case VMCP_GETCODE:
+		ret = put_user(session->resp_code, argp);
+		break;
+	case VMCP_SETBUF:
+		vmcp_response_free(session);
+		ret = get_user(session->bufsize, argp);
+		if (ret)
+			session->bufsize = PAGE_SIZE;
+		if (!session->bufsize || get_order(session->bufsize) > 8) {
+			session->bufsize = PAGE_SIZE;
+			ret = -EINVAL;
+		}
+		break;
+	case VMCP_GETSIZE:
+		ret = put_user(session->resp_size, argp);
+		break;
+	default:
+		break;
+	}
+	mutex_unlock(&session->mutex);
+	return ret;
+}
+
+static const struct file_operations vmcp_fops = {
+	.owner		= THIS_MODULE,
+	.open		= vmcp_open,
+	.release	= vmcp_release,
+	.read		= vmcp_read,
+	.write		= vmcp_write,
+	.unlocked_ioctl	= vmcp_ioctl,
+	.compat_ioctl	= vmcp_ioctl,
+	.llseek		= no_llseek,
+};
+
+static struct miscdevice vmcp_dev = {
+	.name	= "vmcp",
+	.minor	= MISC_DYNAMIC_MINOR,
+	.fops	= &vmcp_fops,
+};
+
+static int __init vmcp_init(void)
+{
+	int ret;
+
+	if (!MACHINE_IS_VM)
+		return 0;
+
+	vmcp_debug = debug_register("vmcp", 1, 1, 240);
+	if (!vmcp_debug)
+		return -ENOMEM;
+
+	ret = debug_register_view(vmcp_debug, &debug_hex_ascii_view);
+	if (ret) {
+		debug_unregister(vmcp_debug);
+		return ret;
+	}
+
+	ret = misc_register(&vmcp_dev);
+	if (ret)
+		debug_unregister(vmcp_debug);
+	return ret;
+}
+device_initcall(vmcp_init);