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@@ -0,0 +1,906 @@
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+/*
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+ * Linux driver for System z and s390 unit record devices
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+ * (z/VM virtual punch, reader, printer)
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+ *
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+ * Copyright IBM Corp. 2001, 2007
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+ * Authors: Malcolm Beattie <beattiem@uk.ibm.com>
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+ * Michael Holzheu <holzheu@de.ibm.com>
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+ * Frank Munzert <munzert@de.ibm.com>
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+ */
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+
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+#include <linux/cdev.h>
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+
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+#include <asm/uaccess.h>
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+#include <asm/cio.h>
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+#include <asm/ccwdev.h>
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+#include <asm/debug.h>
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+
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+#include "vmur.h"
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+
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+/*
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+ * Driver overview
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+ *
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+ * Unit record device support is implemented as a character device driver.
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+ * We can fit at least 16 bits into a device minor number and use the
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+ * simple method of mapping a character device number with minor abcd
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+ * to the unit record device with devno abcd.
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+ * I/O to virtual unit record devices is handled as follows:
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+ * Reads: Diagnose code 0x14 (input spool file manipulation)
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+ * is used to read spool data page-wise.
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+ * Writes: The CCW used is WRITE_CCW_CMD (0x01). The device's record length
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+ * is available by reading sysfs attr reclen. Each write() to the device
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+ * must specify an integral multiple (maximal 511) of reclen.
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+ */
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+
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+static char ur_banner[] = "z/VM virtual unit record device driver";
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+
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+MODULE_AUTHOR("IBM Corporation");
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+MODULE_DESCRIPTION("s390 z/VM virtual unit record device driver");
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+MODULE_LICENSE("GPL");
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+
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+#define PRINTK_HEADER "vmur: "
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+
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+static dev_t ur_first_dev_maj_min;
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+static struct class *vmur_class;
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+static struct debug_info *vmur_dbf;
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+
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+/* We put the device's record length (for writes) in the driver_info field */
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+static struct ccw_device_id ur_ids[] = {
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+ { CCWDEV_CU_DI(READER_PUNCH_DEVTYPE, 80) },
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+ { CCWDEV_CU_DI(PRINTER_DEVTYPE, 132) },
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+ { /* end of list */ }
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+};
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+
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+MODULE_DEVICE_TABLE(ccw, ur_ids);
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+
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+static int ur_probe(struct ccw_device *cdev);
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+static void ur_remove(struct ccw_device *cdev);
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+static int ur_set_online(struct ccw_device *cdev);
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+static int ur_set_offline(struct ccw_device *cdev);
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+
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+static struct ccw_driver ur_driver = {
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+ .name = "vmur",
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+ .owner = THIS_MODULE,
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+ .ids = ur_ids,
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+ .probe = ur_probe,
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+ .remove = ur_remove,
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+ .set_online = ur_set_online,
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+ .set_offline = ur_set_offline,
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+};
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+
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+/*
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+ * Allocation, freeing, getting and putting of urdev structures
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+ */
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+static struct urdev *urdev_alloc(struct ccw_device *cdev)
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+{
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+ struct urdev *urd;
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+
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+ urd = kzalloc(sizeof(struct urdev), GFP_KERNEL);
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+ if (!urd)
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+ return NULL;
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+ urd->cdev = cdev;
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+ urd->reclen = cdev->id.driver_info;
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+ ccw_device_get_id(cdev, &urd->dev_id);
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+ mutex_init(&urd->io_mutex);
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+ mutex_init(&urd->open_mutex);
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+ return urd;
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+}
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+
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+static void urdev_free(struct urdev *urd)
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+{
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+ kfree(urd);
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+}
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+
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+/*
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+ * This is how the character device driver gets a reference to a
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+ * ur device. When this call returns successfully, a reference has
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+ * been taken (by get_device) on the underlying kobject. The recipient
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+ * of this urdev pointer must eventually drop it with urdev_put(urd)
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+ * which does the corresponding put_device().
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+ */
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+static struct urdev *urdev_get_from_devno(u16 devno)
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+{
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+ char bus_id[16];
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+ struct ccw_device *cdev;
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+
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+ sprintf(bus_id, "0.0.%04x", devno);
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+ cdev = get_ccwdev_by_busid(&ur_driver, bus_id);
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+ if (!cdev)
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+ return NULL;
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+
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+ return cdev->dev.driver_data;
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+}
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+
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+static void urdev_put(struct urdev *urd)
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+{
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+ put_device(&urd->cdev->dev);
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+}
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+
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+/*
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+ * Low-level functions to do I/O to a ur device.
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+ * alloc_chan_prog
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+ * do_ur_io
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+ * ur_int_handler
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+ *
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+ * alloc_chan_prog allocates and builds the channel program
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+ *
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+ * do_ur_io issues the channel program to the device and blocks waiting
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+ * on a completion event it publishes at urd->io_done. The function
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+ * serialises itself on the device's mutex so that only one I/O
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+ * is issued at a time (and that I/O is synchronous).
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+ *
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+ * ur_int_handler catches the "I/O done" interrupt, writes the
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+ * subchannel status word into the scsw member of the urdev structure
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+ * and complete()s the io_done to wake the waiting do_ur_io.
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+ *
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+ * The caller of do_ur_io is responsible for kfree()ing the channel program
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+ * address pointer that alloc_chan_prog returned.
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+ */
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+
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+
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+/*
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+ * alloc_chan_prog
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+ * The channel program we use is write commands chained together
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+ * with a final NOP CCW command-chained on (which ensures that CE and DE
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+ * are presented together in a single interrupt instead of as separate
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+ * interrupts unless an incorrect length indication kicks in first). The
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+ * data length in each CCW is reclen. The caller must ensure that count
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+ * is an integral multiple of reclen.
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+ * The channel program pointer returned by this function must be freed
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+ * with kfree. The caller is responsible for checking that
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+ * count/reclen is not ridiculously large.
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+ */
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+static struct ccw1 *alloc_chan_prog(char *buf, size_t count, size_t reclen)
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+{
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+ size_t num_ccws;
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+ struct ccw1 *cpa;
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+ int i;
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+
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+ TRACE("alloc_chan_prog(%p, %zu, %zu)\n", buf, count, reclen);
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+
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+ /*
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+ * We chain a NOP onto the writes to force CE+DE together.
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+ * That means we allocate room for CCWs to cover count/reclen
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+ * records plus a NOP.
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+ */
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+ num_ccws = count / reclen + 1;
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+ cpa = kmalloc(num_ccws * sizeof(struct ccw1), GFP_KERNEL | GFP_DMA);
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+ if (!cpa)
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+ return NULL;
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+
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+ for (i = 0; count; i++) {
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+ cpa[i].cmd_code = WRITE_CCW_CMD;
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+ cpa[i].flags = CCW_FLAG_CC | CCW_FLAG_SLI;
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+ cpa[i].count = reclen;
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+ cpa[i].cda = __pa(buf);
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+ buf += reclen;
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+ count -= reclen;
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+ }
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+ /* The following NOP CCW forces CE+DE to be presented together */
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+ cpa[i].cmd_code = CCW_CMD_NOOP;
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+ cpa[i].flags = 0;
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+ cpa[i].count = 0;
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+ cpa[i].cda = 0;
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+
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+ return cpa;
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+}
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+
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+static int do_ur_io(struct urdev *urd, struct ccw1 *cpa)
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+{
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+ int rc;
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+ struct ccw_device *cdev = urd->cdev;
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+ DECLARE_COMPLETION(event);
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+
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+ TRACE("do_ur_io: cpa=%p\n", cpa);
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+
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+ rc = mutex_lock_interruptible(&urd->io_mutex);
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+ if (rc)
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+ return rc;
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+
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+ urd->io_done = &event;
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+
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+ spin_lock_irq(get_ccwdev_lock(cdev));
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+ rc = ccw_device_start(cdev, cpa, 1, 0, 0);
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+ spin_unlock_irq(get_ccwdev_lock(cdev));
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+
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+ TRACE("do_ur_io: ccw_device_start returned %d\n", rc);
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+ if (rc)
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+ goto out;
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+
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+ wait_for_completion(&event);
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+ TRACE("do_ur_io: I/O complete\n");
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+ rc = 0;
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+
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+out:
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+ mutex_unlock(&urd->io_mutex);
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+ return rc;
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+}
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+
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+/*
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+ * ur interrupt handler, called from the ccw_device layer
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+ */
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+static void ur_int_handler(struct ccw_device *cdev, unsigned long intparm,
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+ struct irb *irb)
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+{
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+ struct urdev *urd;
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+
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+ TRACE("ur_int_handler: intparm=0x%lx cstat=%02x dstat=%02x res=%u\n",
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+ intparm, irb->scsw.cstat, irb->scsw.dstat, irb->scsw.count);
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+
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+ if (!intparm) {
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+ TRACE("ur_int_handler: unsolicited interrupt\n");
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+ return;
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+ }
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+ urd = cdev->dev.driver_data;
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+ /* On special conditions irb is an error pointer */
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+ if (IS_ERR(irb))
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+ urd->io_request_rc = PTR_ERR(irb);
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+ else if (irb->scsw.dstat == (DEV_STAT_CHN_END | DEV_STAT_DEV_END))
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+ urd->io_request_rc = 0;
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+ else
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+ urd->io_request_rc = -EIO;
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+
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+ complete(urd->io_done);
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+}
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+
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+/*
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+ * reclen sysfs attribute - The record length to be used for write CCWs
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+ */
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+static ssize_t ur_attr_reclen_show(struct device *dev,
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+ struct device_attribute *attr, char *buf)
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+{
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+ struct urdev *urd = dev->driver_data;
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+
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+ return sprintf(buf, "%zu\n", urd->reclen);
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+}
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+
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+static DEVICE_ATTR(reclen, 0444, ur_attr_reclen_show, NULL);
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+
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+static int ur_create_attributes(struct device *dev)
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+{
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+ return device_create_file(dev, &dev_attr_reclen);
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+}
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+
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+static void ur_remove_attributes(struct device *dev)
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+{
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+ device_remove_file(dev, &dev_attr_reclen);
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+}
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+
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+/*
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+ * diagnose code 0x210 - retrieve device information
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+ * cc=0 normal completion, we have a real device
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+ * cc=1 CP paging error
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+ * cc=2 The virtual device exists, but is not associated with a real device
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+ * cc=3 Invalid device address, or the virtual device does not exist
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+ */
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+static int get_urd_class(struct urdev *urd)
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+{
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+ static struct diag210 ur_diag210;
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+ int cc;
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+
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+ ur_diag210.vrdcdvno = urd->dev_id.devno;
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+ ur_diag210.vrdclen = sizeof(struct diag210);
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+
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+ cc = diag210(&ur_diag210);
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+ switch (cc) {
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+ case 0:
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+ return -ENOTSUPP;
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+ case 2:
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+ return ur_diag210.vrdcvcla; /* virtual device class */
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+ case 3:
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+ return -ENODEV;
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+ default:
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+ return -EIO;
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+ }
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+}
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+
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+/*
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+ * Allocation and freeing of urfile structures
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+ */
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+static struct urfile *urfile_alloc(struct urdev *urd)
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+{
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+ struct urfile *urf;
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+
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+ urf = kzalloc(sizeof(struct urfile), GFP_KERNEL);
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+ if (!urf)
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+ return NULL;
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+ urf->urd = urd;
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+
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+ TRACE("urfile_alloc: urd=%p urf=%p rl=%zu\n", urd, urf,
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+ urf->dev_reclen);
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+
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+ return urf;
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+}
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+
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+static void urfile_free(struct urfile *urf)
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+{
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+ TRACE("urfile_free: urf=%p urd=%p\n", urf, urf->urd);
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+ kfree(urf);
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+}
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+
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+/*
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+ * The fops implementation of the character device driver
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+ */
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+static ssize_t do_write(struct urdev *urd, const char __user *udata,
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+ size_t count, size_t reclen, loff_t *ppos)
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+{
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+ struct ccw1 *cpa;
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+ char *buf;
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+ int rc;
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+
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+ /* Data buffer must be under 2GB line for fmt1 CCWs: hence GFP_DMA */
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+ buf = kmalloc(count, GFP_KERNEL | GFP_DMA);
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+ if (!buf)
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+ return -ENOMEM;
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+
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+ if (copy_from_user(buf, udata, count)) {
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+ rc = -EFAULT;
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+ goto fail_kfree_buf;
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+ }
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+
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+ cpa = alloc_chan_prog(buf, count, reclen);
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+ if (!cpa) {
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+ rc = -ENOMEM;
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+ goto fail_kfree_buf;
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+ }
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+
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+ rc = do_ur_io(urd, cpa);
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+ if (rc)
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+ goto fail_kfree_cpa;
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+
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+ if (urd->io_request_rc) {
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+ rc = urd->io_request_rc;
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+ goto fail_kfree_cpa;
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+ }
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+ *ppos += count;
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+ rc = count;
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+fail_kfree_cpa:
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+ kfree(cpa);
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+fail_kfree_buf:
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+ kfree(buf);
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+ return rc;
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+}
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+
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+static ssize_t ur_write(struct file *file, const char __user *udata,
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+ size_t count, loff_t *ppos)
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+{
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+ struct urfile *urf = file->private_data;
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+
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+ TRACE("ur_write: count=%zu\n", count);
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+
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+ if (count == 0)
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+ return 0;
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+
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+ if (count % urf->dev_reclen)
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+ return -EINVAL; /* count must be a multiple of reclen */
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+
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+ if (count > urf->dev_reclen * MAX_RECS_PER_IO)
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+ count = urf->dev_reclen * MAX_RECS_PER_IO;
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+
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+ return do_write(urf->urd, udata, count, urf->dev_reclen, ppos);
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+}
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+
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+static int do_diag_14(unsigned long rx, unsigned long ry1,
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+ unsigned long subcode)
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+{
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+ register unsigned long _ry1 asm("2") = ry1;
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+ register unsigned long _ry2 asm("3") = subcode;
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+ int rc = 0;
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+
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+ asm volatile(
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+#ifdef CONFIG_64BIT
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+ " sam31\n"
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+ " diag %2,2,0x14\n"
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+ " sam64\n"
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+#else
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+ " diag %2,2,0x14\n"
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+#endif
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+ " ipm %0\n"
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+ " srl %0,28\n"
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+ : "=d" (rc), "+d" (_ry2)
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+ : "d" (rx), "d" (_ry1)
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+ : "cc");
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+
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+ TRACE("diag 14: subcode=0x%lx, cc=%i\n", subcode, rc);
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+ return rc;
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+}
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+
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+/*
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|
|
+ * diagnose code 0x14 subcode 0x0028 - position spool file to designated
|
|
|
+ * record
|
|
|
+ * cc=0 normal completion
|
|
|
+ * cc=2 no file active on the virtual reader or device not ready
|
|
|
+ * cc=3 record specified is beyond EOF
|
|
|
+ */
|
|
|
+static int diag_position_to_record(int devno, int record)
|
|
|
+{
|
|
|
+ int cc;
|
|
|
+
|
|
|
+ cc = do_diag_14(record, devno, 0x28);
|
|
|
+ switch (cc) {
|
|
|
+ case 0:
|
|
|
+ return 0;
|
|
|
+ case 2:
|
|
|
+ return -ENOMEDIUM;
|
|
|
+ case 3:
|
|
|
+ return -ENODATA; /* position beyond end of file */
|
|
|
+ default:
|
|
|
+ return -EIO;
|
|
|
+ }
|
|
|
+}
|
|
|
+
|
|
|
+/*
|
|
|
+ * diagnose code 0x14 subcode 0x0000 - read next spool file buffer
|
|
|
+ * cc=0 normal completion
|
|
|
+ * cc=1 EOF reached
|
|
|
+ * cc=2 no file active on the virtual reader, and no file eligible
|
|
|
+ * cc=3 file already active on the virtual reader or specified virtual
|
|
|
+ * reader does not exist or is not a reader
|
|
|
+ */
|
|
|
+static int diag_read_file(int devno, char *buf)
|
|
|
+{
|
|
|
+ int cc;
|
|
|
+
|
|
|
+ cc = do_diag_14((unsigned long) buf, devno, 0x00);
|
|
|
+ switch (cc) {
|
|
|
+ case 0:
|
|
|
+ return 0;
|
|
|
+ case 1:
|
|
|
+ return -ENODATA;
|
|
|
+ case 2:
|
|
|
+ return -ENOMEDIUM;
|
|
|
+ default:
|
|
|
+ return -EIO;
|
|
|
+ }
|
|
|
+}
|
|
|
+
|
|
|
+static ssize_t diag14_read(struct file *file, char __user *ubuf, size_t count,
|
|
|
+ loff_t *offs)
|
|
|
+{
|
|
|
+ size_t len, copied, res;
|
|
|
+ char *buf;
|
|
|
+ int rc;
|
|
|
+ u16 reclen;
|
|
|
+ struct urdev *urd;
|
|
|
+
|
|
|
+ urd = ((struct urfile *) file->private_data)->urd;
|
|
|
+ reclen = ((struct urfile *) file->private_data)->file_reclen;
|
|
|
+
|
|
|
+ rc = diag_position_to_record(urd->dev_id.devno, *offs / PAGE_SIZE + 1);
|
|
|
+ if (rc == -ENODATA)
|
|
|
+ return 0;
|
|
|
+ if (rc)
|
|
|
+ return rc;
|
|
|
+
|
|
|
+ len = min((size_t) PAGE_SIZE, count);
|
|
|
+ buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
|
|
|
+ if (!buf)
|
|
|
+ return -ENOMEM;
|
|
|
+
|
|
|
+ copied = 0;
|
|
|
+ res = (size_t) (*offs % PAGE_SIZE);
|
|
|
+ do {
|
|
|
+ rc = diag_read_file(urd->dev_id.devno, buf);
|
|
|
+ if (rc == -ENODATA) {
|
|
|
+ break;
|
|
|
+ }
|
|
|
+ if (rc)
|
|
|
+ goto fail;
|
|
|
+ if (reclen)
|
|
|
+ *((u16 *) &buf[FILE_RECLEN_OFFSET]) = reclen;
|
|
|
+ len = min(count - copied, PAGE_SIZE - res);
|
|
|
+ if (copy_to_user(ubuf + copied, buf + res, len)) {
|
|
|
+ rc = -EFAULT;
|
|
|
+ goto fail;
|
|
|
+ }
|
|
|
+ res = 0;
|
|
|
+ copied += len;
|
|
|
+ } while (copied != count);
|
|
|
+
|
|
|
+ *offs += copied;
|
|
|
+ rc = copied;
|
|
|
+fail:
|
|
|
+ kfree(buf);
|
|
|
+ return rc;
|
|
|
+}
|
|
|
+
|
|
|
+static ssize_t ur_read(struct file *file, char __user *ubuf, size_t count,
|
|
|
+ loff_t *offs)
|
|
|
+{
|
|
|
+ struct urdev *urd;
|
|
|
+ int rc;
|
|
|
+
|
|
|
+ TRACE("ur_read: count=%zu ppos=%li\n", count, (unsigned long) *offs);
|
|
|
+
|
|
|
+ if (count == 0)
|
|
|
+ return 0;
|
|
|
+
|
|
|
+ urd = ((struct urfile *) file->private_data)->urd;
|
|
|
+ rc = mutex_lock_interruptible(&urd->io_mutex);
|
|
|
+ if (rc)
|
|
|
+ return rc;
|
|
|
+ rc = diag14_read(file, ubuf, count, offs);
|
|
|
+ mutex_unlock(&urd->io_mutex);
|
|
|
+ return rc;
|
|
|
+}
|
|
|
+
|
|
|
+/*
|
|
|
+ * diagnose code 0x14 subcode 0x0fff - retrieve next file descriptor
|
|
|
+ * cc=0 normal completion
|
|
|
+ * cc=1 no files on reader queue or no subsequent file
|
|
|
+ * cc=2 spid specified is invalid
|
|
|
+ */
|
|
|
+static int diag_read_next_file_info(struct file_control_block *buf, int spid)
|
|
|
+{
|
|
|
+ int cc;
|
|
|
+
|
|
|
+ cc = do_diag_14((unsigned long) buf, spid, 0xfff);
|
|
|
+ switch (cc) {
|
|
|
+ case 0:
|
|
|
+ return 0;
|
|
|
+ default:
|
|
|
+ return -ENODATA;
|
|
|
+ }
|
|
|
+}
|
|
|
+
|
|
|
+static int verify_device(struct urdev *urd)
|
|
|
+{
|
|
|
+ struct file_control_block fcb;
|
|
|
+ char *buf;
|
|
|
+ int rc;
|
|
|
+
|
|
|
+ switch (urd->class) {
|
|
|
+ case DEV_CLASS_UR_O:
|
|
|
+ return 0; /* no check needed here */
|
|
|
+ case DEV_CLASS_UR_I:
|
|
|
+ /* check for empty reader device (beginning of chain) */
|
|
|
+ rc = diag_read_next_file_info(&fcb, 0);
|
|
|
+ if (rc)
|
|
|
+ return rc;
|
|
|
+
|
|
|
+ /* open file on virtual reader */
|
|
|
+ buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
|
|
|
+ if (!buf)
|
|
|
+ return -ENOMEM;
|
|
|
+ rc = diag_read_file(urd->dev_id.devno, buf);
|
|
|
+ kfree(buf);
|
|
|
+
|
|
|
+ if ((rc != 0) && (rc != -ENODATA)) /* EOF does not hurt */
|
|
|
+ return rc;
|
|
|
+ return 0;
|
|
|
+ default:
|
|
|
+ return -ENOTSUPP;
|
|
|
+ }
|
|
|
+}
|
|
|
+
|
|
|
+static int get_file_reclen(struct urdev *urd)
|
|
|
+{
|
|
|
+ struct file_control_block fcb;
|
|
|
+ int rc;
|
|
|
+
|
|
|
+ switch (urd->class) {
|
|
|
+ case DEV_CLASS_UR_O:
|
|
|
+ return 0;
|
|
|
+ case DEV_CLASS_UR_I:
|
|
|
+ rc = diag_read_next_file_info(&fcb, 0);
|
|
|
+ if (rc)
|
|
|
+ return rc;
|
|
|
+ break;
|
|
|
+ default:
|
|
|
+ return -ENOTSUPP;
|
|
|
+ }
|
|
|
+ if (fcb.file_stat & FLG_CP_DUMP)
|
|
|
+ return 0;
|
|
|
+
|
|
|
+ return fcb.rec_len;
|
|
|
+}
|
|
|
+
|
|
|
+static int ur_open(struct inode *inode, struct file *file)
|
|
|
+{
|
|
|
+ u16 devno;
|
|
|
+ struct urdev *urd;
|
|
|
+ struct urfile *urf;
|
|
|
+ unsigned short accmode;
|
|
|
+ int rc;
|
|
|
+
|
|
|
+ accmode = file->f_flags & O_ACCMODE;
|
|
|
+
|
|
|
+ if (accmode == O_RDWR)
|
|
|
+ return -EACCES;
|
|
|
+
|
|
|
+ /*
|
|
|
+ * We treat the minor number as the devno of the ur device
|
|
|
+ * to find in the driver tree.
|
|
|
+ */
|
|
|
+ devno = MINOR(file->f_dentry->d_inode->i_rdev);
|
|
|
+
|
|
|
+ urd = urdev_get_from_devno(devno);
|
|
|
+ if (!urd)
|
|
|
+ return -ENXIO;
|
|
|
+
|
|
|
+ if (file->f_flags & O_NONBLOCK) {
|
|
|
+ if (!mutex_trylock(&urd->open_mutex)) {
|
|
|
+ rc = -EBUSY;
|
|
|
+ goto fail_put;
|
|
|
+ }
|
|
|
+ } else {
|
|
|
+ if (mutex_lock_interruptible(&urd->open_mutex)) {
|
|
|
+ rc = -ERESTARTSYS;
|
|
|
+ goto fail_put;
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ TRACE("ur_open\n");
|
|
|
+
|
|
|
+ if (((accmode == O_RDONLY) && (urd->class != DEV_CLASS_UR_I)) ||
|
|
|
+ ((accmode == O_WRONLY) && (urd->class != DEV_CLASS_UR_O))) {
|
|
|
+ TRACE("ur_open: unsupported dev class (%d)\n", urd->class);
|
|
|
+ rc = -EACCES;
|
|
|
+ goto fail_unlock;
|
|
|
+ }
|
|
|
+
|
|
|
+ rc = verify_device(urd);
|
|
|
+ if (rc)
|
|
|
+ goto fail_unlock;
|
|
|
+
|
|
|
+ urf = urfile_alloc(urd);
|
|
|
+ if (!urf) {
|
|
|
+ rc = -ENOMEM;
|
|
|
+ goto fail_unlock;
|
|
|
+ }
|
|
|
+
|
|
|
+ urf->dev_reclen = urd->reclen;
|
|
|
+ rc = get_file_reclen(urd);
|
|
|
+ if (rc < 0)
|
|
|
+ goto fail_urfile_free;
|
|
|
+ urf->file_reclen = rc;
|
|
|
+ file->private_data = urf;
|
|
|
+ return 0;
|
|
|
+
|
|
|
+fail_urfile_free:
|
|
|
+ urfile_free(urf);
|
|
|
+fail_unlock:
|
|
|
+ mutex_unlock(&urd->open_mutex);
|
|
|
+fail_put:
|
|
|
+ urdev_put(urd);
|
|
|
+ return rc;
|
|
|
+}
|
|
|
+
|
|
|
+static int ur_release(struct inode *inode, struct file *file)
|
|
|
+{
|
|
|
+ struct urfile *urf = file->private_data;
|
|
|
+
|
|
|
+ TRACE("ur_release\n");
|
|
|
+ mutex_unlock(&urf->urd->open_mutex);
|
|
|
+ urdev_put(urf->urd);
|
|
|
+ urfile_free(urf);
|
|
|
+ return 0;
|
|
|
+}
|
|
|
+
|
|
|
+static loff_t ur_llseek(struct file *file, loff_t offset, int whence)
|
|
|
+{
|
|
|
+ loff_t newpos;
|
|
|
+
|
|
|
+ if ((file->f_flags & O_ACCMODE) != O_RDONLY)
|
|
|
+ return -ESPIPE; /* seek allowed only for reader */
|
|
|
+ if (offset % PAGE_SIZE)
|
|
|
+ return -ESPIPE; /* only multiples of 4K allowed */
|
|
|
+ switch (whence) {
|
|
|
+ case 0: /* SEEK_SET */
|
|
|
+ newpos = offset;
|
|
|
+ break;
|
|
|
+ case 1: /* SEEK_CUR */
|
|
|
+ newpos = file->f_pos + offset;
|
|
|
+ break;
|
|
|
+ default:
|
|
|
+ return -EINVAL;
|
|
|
+ }
|
|
|
+ file->f_pos = newpos;
|
|
|
+ return newpos;
|
|
|
+}
|
|
|
+
|
|
|
+static struct file_operations ur_fops = {
|
|
|
+ .owner = THIS_MODULE,
|
|
|
+ .open = ur_open,
|
|
|
+ .release = ur_release,
|
|
|
+ .read = ur_read,
|
|
|
+ .write = ur_write,
|
|
|
+ .llseek = ur_llseek,
|
|
|
+};
|
|
|
+
|
|
|
+/*
|
|
|
+ * ccw_device infrastructure:
|
|
|
+ * ur_probe gets its own ref to the device (i.e. get_device),
|
|
|
+ * creates the struct urdev, the device attributes, sets up
|
|
|
+ * the interrupt handler and validates the virtual unit record device.
|
|
|
+ * ur_remove removes the device attributes, frees the struct urdev
|
|
|
+ * and drops (put_device) the ref to the device we got in ur_probe.
|
|
|
+ */
|
|
|
+static int ur_probe(struct ccw_device *cdev)
|
|
|
+{
|
|
|
+ struct urdev *urd;
|
|
|
+ int rc;
|
|
|
+
|
|
|
+ TRACE("ur_probe: cdev=%p state=%d\n", cdev, *(int *) cdev->private);
|
|
|
+
|
|
|
+ if (!get_device(&cdev->dev))
|
|
|
+ return -ENODEV;
|
|
|
+
|
|
|
+ urd = urdev_alloc(cdev);
|
|
|
+ if (!urd) {
|
|
|
+ rc = -ENOMEM;
|
|
|
+ goto fail;
|
|
|
+ }
|
|
|
+ rc = ur_create_attributes(&cdev->dev);
|
|
|
+ if (rc) {
|
|
|
+ rc = -ENOMEM;
|
|
|
+ goto fail;
|
|
|
+ }
|
|
|
+ cdev->dev.driver_data = urd;
|
|
|
+ cdev->handler = ur_int_handler;
|
|
|
+
|
|
|
+ /* validate virtual unit record device */
|
|
|
+ urd->class = get_urd_class(urd);
|
|
|
+ if (urd->class < 0) {
|
|
|
+ rc = urd->class;
|
|
|
+ goto fail;
|
|
|
+ }
|
|
|
+ if ((urd->class != DEV_CLASS_UR_I) && (urd->class != DEV_CLASS_UR_O)) {
|
|
|
+ rc = -ENOTSUPP;
|
|
|
+ goto fail;
|
|
|
+ }
|
|
|
+
|
|
|
+ return 0;
|
|
|
+
|
|
|
+fail:
|
|
|
+ urdev_free(urd);
|
|
|
+ put_device(&cdev->dev);
|
|
|
+ return rc;
|
|
|
+}
|
|
|
+
|
|
|
+static void ur_remove(struct ccw_device *cdev)
|
|
|
+{
|
|
|
+ struct urdev *urd = cdev->dev.driver_data;
|
|
|
+
|
|
|
+ TRACE("ur_remove\n");
|
|
|
+ if (cdev->online)
|
|
|
+ ur_set_offline(cdev);
|
|
|
+ ur_remove_attributes(&cdev->dev);
|
|
|
+ urdev_free(urd);
|
|
|
+ put_device(&cdev->dev);
|
|
|
+}
|
|
|
+
|
|
|
+static int ur_set_online(struct ccw_device *cdev)
|
|
|
+{
|
|
|
+ struct urdev *urd;
|
|
|
+ int minor, major, rc;
|
|
|
+ char node_id[16];
|
|
|
+
|
|
|
+ TRACE("ur_set_online: cdev=%p state=%d\n", cdev,
|
|
|
+ *(int *) cdev->private);
|
|
|
+
|
|
|
+ if (!try_module_get(ur_driver.owner))
|
|
|
+ return -EINVAL;
|
|
|
+
|
|
|
+ urd = (struct urdev *) cdev->dev.driver_data;
|
|
|
+ minor = urd->dev_id.devno;
|
|
|
+ major = MAJOR(ur_first_dev_maj_min);
|
|
|
+
|
|
|
+ urd->char_device = cdev_alloc();
|
|
|
+ if (!urd->char_device) {
|
|
|
+ rc = -ENOMEM;
|
|
|
+ goto fail_module_put;
|
|
|
+ }
|
|
|
+
|
|
|
+ cdev_init(urd->char_device, &ur_fops);
|
|
|
+ urd->char_device->dev = MKDEV(major, minor);
|
|
|
+ urd->char_device->owner = ur_fops.owner;
|
|
|
+
|
|
|
+ rc = cdev_add(urd->char_device, urd->char_device->dev, 1);
|
|
|
+ if (rc)
|
|
|
+ goto fail_free_cdev;
|
|
|
+ if (urd->cdev->id.cu_type == READER_PUNCH_DEVTYPE) {
|
|
|
+ if (urd->class == DEV_CLASS_UR_I)
|
|
|
+ sprintf(node_id, "vmrdr-%s", cdev->dev.bus_id);
|
|
|
+ if (urd->class == DEV_CLASS_UR_O)
|
|
|
+ sprintf(node_id, "vmpun-%s", cdev->dev.bus_id);
|
|
|
+ } else if (urd->cdev->id.cu_type == PRINTER_DEVTYPE) {
|
|
|
+ sprintf(node_id, "vmprt-%s", cdev->dev.bus_id);
|
|
|
+ } else {
|
|
|
+ rc = -ENOTSUPP;
|
|
|
+ goto fail_free_cdev;
|
|
|
+ }
|
|
|
+
|
|
|
+ urd->device = device_create(vmur_class, NULL, urd->char_device->dev,
|
|
|
+ "%s", node_id);
|
|
|
+ if (IS_ERR(urd->device)) {
|
|
|
+ rc = PTR_ERR(urd->device);
|
|
|
+ TRACE("ur_set_online: device_create rc=%d\n", rc);
|
|
|
+ goto fail_free_cdev;
|
|
|
+ }
|
|
|
+
|
|
|
+ return 0;
|
|
|
+
|
|
|
+fail_free_cdev:
|
|
|
+ cdev_del(urd->char_device);
|
|
|
+fail_module_put:
|
|
|
+ module_put(ur_driver.owner);
|
|
|
+
|
|
|
+ return rc;
|
|
|
+}
|
|
|
+
|
|
|
+static int ur_set_offline(struct ccw_device *cdev)
|
|
|
+{
|
|
|
+ struct urdev *urd;
|
|
|
+
|
|
|
+ TRACE("ur_set_offline: cdev=%p cdev->private=%p state=%d\n",
|
|
|
+ cdev, cdev->private, *(int *) cdev->private);
|
|
|
+ urd = (struct urdev *) cdev->dev.driver_data;
|
|
|
+ device_destroy(vmur_class, urd->char_device->dev);
|
|
|
+ cdev_del(urd->char_device);
|
|
|
+ module_put(ur_driver.owner);
|
|
|
+
|
|
|
+ return 0;
|
|
|
+}
|
|
|
+
|
|
|
+/*
|
|
|
+ * Module initialisation and cleanup
|
|
|
+ */
|
|
|
+static int __init ur_init(void)
|
|
|
+{
|
|
|
+ int rc;
|
|
|
+ dev_t dev;
|
|
|
+
|
|
|
+ if (!MACHINE_IS_VM) {
|
|
|
+ PRINT_ERR("%s is only available under z/VM.\n", ur_banner);
|
|
|
+ return -ENODEV;
|
|
|
+ }
|
|
|
+
|
|
|
+ vmur_dbf = debug_register("vmur", 4, 1, 4 * sizeof(long));
|
|
|
+ if (!vmur_dbf)
|
|
|
+ return -ENOMEM;
|
|
|
+ rc = debug_register_view(vmur_dbf, &debug_sprintf_view);
|
|
|
+ if (rc)
|
|
|
+ goto fail_free_dbf;
|
|
|
+
|
|
|
+ debug_set_level(vmur_dbf, 6);
|
|
|
+
|
|
|
+ rc = ccw_driver_register(&ur_driver);
|
|
|
+ if (rc)
|
|
|
+ goto fail_free_dbf;
|
|
|
+
|
|
|
+ rc = alloc_chrdev_region(&dev, 0, NUM_MINORS, "vmur");
|
|
|
+ if (rc) {
|
|
|
+ PRINT_ERR("alloc_chrdev_region failed: err = %d\n", rc);
|
|
|
+ goto fail_unregister_driver;
|
|
|
+ }
|
|
|
+ ur_first_dev_maj_min = MKDEV(MAJOR(dev), 0);
|
|
|
+
|
|
|
+ vmur_class = class_create(THIS_MODULE, "vmur");
|
|
|
+ if (IS_ERR(vmur_class)) {
|
|
|
+ rc = PTR_ERR(vmur_class);
|
|
|
+ goto fail_unregister_region;
|
|
|
+ }
|
|
|
+ PRINT_INFO("%s loaded.\n", ur_banner);
|
|
|
+ return 0;
|
|
|
+
|
|
|
+fail_unregister_region:
|
|
|
+ unregister_chrdev_region(ur_first_dev_maj_min, NUM_MINORS);
|
|
|
+fail_unregister_driver:
|
|
|
+ ccw_driver_unregister(&ur_driver);
|
|
|
+fail_free_dbf:
|
|
|
+ debug_unregister(vmur_dbf);
|
|
|
+ return rc;
|
|
|
+}
|
|
|
+
|
|
|
+static void __exit ur_exit(void)
|
|
|
+{
|
|
|
+ class_destroy(vmur_class);
|
|
|
+ unregister_chrdev_region(ur_first_dev_maj_min, NUM_MINORS);
|
|
|
+ ccw_driver_unregister(&ur_driver);
|
|
|
+ debug_unregister(vmur_dbf);
|
|
|
+ PRINT_INFO("%s unloaded.\n", ur_banner);
|
|
|
+}
|
|
|
+
|
|
|
+module_init(ur_init);
|
|
|
+module_exit(ur_exit);
|
Linus Torvalds