Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / drivers / ide / ide-devsets.c

diff --git a/kernel/drivers/ide/ide-devsets.c b/kernel/drivers/ide/ide-devsets.c
new file mode 100644 (file)
index 0000000..9e98122
--- /dev/null
+++ b/kernel/drivers/ide/ide-devsets.c
@@ -0,0 +1,191 @@
+
+#include <linux/kernel.h>
+#include <linux/gfp.h>
+#include <linux/ide.h>
+
+DEFINE_MUTEX(ide_setting_mtx);
+
+ide_devset_get(io_32bit, io_32bit);
+
+static int set_io_32bit(ide_drive_t *drive, int arg)
+{
+       if (drive->dev_flags & IDE_DFLAG_NO_IO_32BIT)
+               return -EPERM;
+
+       if (arg < 0 || arg > 1 + (SUPPORT_VLB_SYNC << 1))
+               return -EINVAL;
+
+       drive->io_32bit = arg;
+
+       return 0;
+}
+
+ide_devset_get_flag(ksettings, IDE_DFLAG_KEEP_SETTINGS);
+
+static int set_ksettings(ide_drive_t *drive, int arg)
+{
+       if (arg < 0 || arg > 1)
+               return -EINVAL;
+
+       if (arg)
+               drive->dev_flags |= IDE_DFLAG_KEEP_SETTINGS;
+       else
+               drive->dev_flags &= ~IDE_DFLAG_KEEP_SETTINGS;
+
+       return 0;
+}
+
+ide_devset_get_flag(using_dma, IDE_DFLAG_USING_DMA);
+
+static int set_using_dma(ide_drive_t *drive, int arg)
+{
+#ifdef CONFIG_BLK_DEV_IDEDMA
+       int err = -EPERM;
+
+       if (arg < 0 || arg > 1)
+               return -EINVAL;
+
+       if (ata_id_has_dma(drive->id) == 0)
+               goto out;
+
+       if (drive->hwif->dma_ops == NULL)
+               goto out;
+
+       err = 0;
+
+       if (arg) {
+               if (ide_set_dma(drive))
+                       err = -EIO;
+       } else
+               ide_dma_off(drive);
+
+out:
+       return err;
+#else
+       if (arg < 0 || arg > 1)
+               return -EINVAL;
+
+       return -EPERM;
+#endif
+}
+
+/*
+ * handle HDIO_SET_PIO_MODE ioctl abusers here, eventually it will go away
+ */
+static int set_pio_mode_abuse(ide_hwif_t *hwif, u8 req_pio)
+{
+       switch (req_pio) {
+       case 202:
+       case 201:
+       case 200:
+       case 102:
+       case 101:
+       case 100:
+               return (hwif->host_flags & IDE_HFLAG_ABUSE_DMA_MODES) ? 1 : 0;
+       case 9:
+       case 8:
+               return (hwif->host_flags & IDE_HFLAG_ABUSE_PREFETCH) ? 1 : 0;
+       case 7:
+       case 6:
+               return (hwif->host_flags & IDE_HFLAG_ABUSE_FAST_DEVSEL) ? 1 : 0;
+       default:
+               return 0;
+       }
+}
+
+static int set_pio_mode(ide_drive_t *drive, int arg)
+{
+       ide_hwif_t *hwif = drive->hwif;
+       const struct ide_port_ops *port_ops = hwif->port_ops;
+
+       if (arg < 0 || arg > 255)
+               return -EINVAL;
+
+       if (port_ops == NULL || port_ops->set_pio_mode == NULL ||
+           (hwif->host_flags & IDE_HFLAG_NO_SET_MODE))
+               return -ENOSYS;
+
+       if (set_pio_mode_abuse(drive->hwif, arg)) {
+               drive->pio_mode = arg + XFER_PIO_0;
+
+               if (arg == 8 || arg == 9) {
+                       unsigned long flags;
+
+                       /* take lock for IDE_DFLAG_[NO_]UNMASK/[NO_]IO_32BIT */
+                       spin_lock_irqsave(&hwif->lock, flags);
+                       port_ops->set_pio_mode(hwif, drive);
+                       spin_unlock_irqrestore(&hwif->lock, flags);
+               } else
+                       port_ops->set_pio_mode(hwif, drive);
+       } else {
+               int keep_dma = !!(drive->dev_flags & IDE_DFLAG_USING_DMA);
+
+               ide_set_pio(drive, arg);
+
+               if (hwif->host_flags & IDE_HFLAG_SET_PIO_MODE_KEEP_DMA) {
+                       if (keep_dma)
+                               ide_dma_on(drive);
+               }
+       }
+
+       return 0;
+}
+
+ide_devset_get_flag(unmaskirq, IDE_DFLAG_UNMASK);
+
+static int set_unmaskirq(ide_drive_t *drive, int arg)
+{
+       if (drive->dev_flags & IDE_DFLAG_NO_UNMASK)
+               return -EPERM;
+
+       if (arg < 0 || arg > 1)
+               return -EINVAL;
+
+       if (arg)
+               drive->dev_flags |= IDE_DFLAG_UNMASK;
+       else
+               drive->dev_flags &= ~IDE_DFLAG_UNMASK;
+
+       return 0;
+}
+
+ide_ext_devset_rw_sync(io_32bit, io_32bit);
+ide_ext_devset_rw_sync(keepsettings, ksettings);
+ide_ext_devset_rw_sync(unmaskirq, unmaskirq);
+ide_ext_devset_rw_sync(using_dma, using_dma);
+__IDE_DEVSET(pio_mode, DS_SYNC, NULL, set_pio_mode);
+
+int ide_devset_execute(ide_drive_t *drive, const struct ide_devset *setting,
+                      int arg)
+{
+       struct request_queue *q = drive->queue;
+       struct request *rq;
+       int ret = 0;
+
+       if (!(setting->flags & DS_SYNC))
+               return setting->set(drive, arg);
+
+       rq = blk_get_request(q, READ, __GFP_WAIT);
+       rq->cmd_type = REQ_TYPE_SPECIAL;
+       rq->cmd_len = 5;
+       rq->cmd[0] = REQ_DEVSET_EXEC;
+       *(int *)&rq->cmd[1] = arg;
+       rq->special = setting->set;
+
+       if (blk_execute_rq(q, NULL, rq, 0))
+               ret = rq->errors;
+       blk_put_request(rq);
+
+       return ret;
+}
+
+ide_startstop_t ide_do_devset(ide_drive_t *drive, struct request *rq)
+{
+       int err, (*setfunc)(ide_drive_t *, int) = rq->special;
+
+       err = setfunc(drive, *(int *)&rq->cmd[1]);
+       if (err)
+               rq->errors = err;
+       ide_complete_rq(drive, err, blk_rq_bytes(rq));
+       return ide_stopped;
+}