io/drm/radeon_irq.c

/*
 * Copyright 2009 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */
/* radeon_irq.c -- IRQ handling for radeon -*- linux-c -*- */
/*
 * Copyright (C) The Weather Channel, Inc.  2002.  All Rights Reserved.
 *
 * The Weather Channel (TM) funded Tungsten Graphics to develop the
 * initial release of the Radeon 8500 driver under the XFree86 license.
 * This notice must be preserved.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice (including the next
 * paragraph) shall be included in all copies or substantial portions of the
 * Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * PRECISION INSIGHT AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 * DEALINGS IN THE SOFTWARE.
 *
 * Authors:
 *    Keith Whitwell <keith@tungstengraphics.com>
 *    Michel D�zer <michel@daenzer.net>
 */

#include "drmP.h"
#include "radeon_drm.h"
#include "radeon_drv.h"
#include "radeon_io32.h"

static inline u32
radeon_acknowledge_irqs(drm_radeon_private_t *dev_priv, u32 mask)
{
    uint32_t irqs = RADEON_READ(RADEON_GEN_INT_STATUS) & mask;
    if (irqs)
        RADEON_WRITE(RADEON_GEN_INT_STATUS, irqs);
    return (irqs);
}

/*
 * Interrupts - Used for device synchronization and flushing in the
 * following circumstances:
 *
 * - Exclusive FB access with hw idle:
 *    - Wait for GUI Idle (?) interrupt, then do normal flush.
 *
 * - Frame throttling, NV_fence:
 *    - Drop marker irq's into command stream ahead of time.
 *    - Wait on irq's with lock *not held*
 *    - Check each for termination condition
 *
 * - Internally in cp_getbuffer, etc:
 *    - as above, but wait with lock held???
 *
 * NOTE: These functions are misleadingly named -- the irq's aren't
 * tied to dma at all, this is just a hangover from dri prehistory.
 */

irqreturn_t
radeon_driver_irq_handler(DRM_IRQ_ARGS)
{
    drm_device_t *dev = (drm_device_t *)(uintptr_t)arg;
    drm_radeon_private_t *dev_priv =
        (drm_radeon_private_t *)dev->dev_private;
    u32 stat;

    /*
     * Only consider the bits we're interested in - others could be used
     * outside the DRM
     */
    stat = radeon_acknowledge_irqs(dev_priv, (RADEON_SW_INT_TEST_ACK |
        RADEON_CRTC_VBLANK_STAT | RADEON_CRTC2_VBLANK_STAT));
    if (!stat)
        return (IRQ_NONE);

    stat &= dev_priv->irq_enable_reg;

    /* SW interrupt */
    if (stat & RADEON_SW_INT_TEST) {
        DRM_WAKEUP(&dev_priv->swi_queue);
    }

    /* VBLANK interrupt */
    if (stat & (RADEON_CRTC_VBLANK_STAT | RADEON_CRTC2_VBLANK_STAT)) {
        int vblank_crtc = dev_priv->vblank_crtc;

        if ((vblank_crtc &
            (DRM_RADEON_VBLANK_CRTC1 | DRM_RADEON_VBLANK_CRTC2)) ==
            (DRM_RADEON_VBLANK_CRTC1 | DRM_RADEON_VBLANK_CRTC2)) {
            if (stat & RADEON_CRTC_VBLANK_STAT)
                atomic_inc(&dev->vbl_received);
            if (stat & RADEON_CRTC2_VBLANK_STAT)
                atomic_inc(&dev->vbl_received2);
        } else if (((stat & RADEON_CRTC_VBLANK_STAT) &&
            (vblank_crtc & DRM_RADEON_VBLANK_CRTC1)) ||
            ((stat & RADEON_CRTC2_VBLANK_STAT) &&
            (vblank_crtc & DRM_RADEON_VBLANK_CRTC2)))
            atomic_inc(&dev->vbl_received);

        DRM_WAKEUP(&dev->vbl_queue);
        drm_vbl_send_signals(dev);
    }

    return (IRQ_HANDLED);
}

static int radeon_emit_irq(drm_device_t *dev)
{
    drm_radeon_private_t *dev_priv = dev->dev_private;
    unsigned int ret;
    RING_LOCALS;

    atomic_inc(&dev_priv->swi_emitted);
    ret = atomic_read(&dev_priv->swi_emitted);

    BEGIN_RING(4);
    OUT_RING_REG(RADEON_LAST_SWI_REG, ret);
    OUT_RING_REG(RADEON_GEN_INT_STATUS, RADEON_SW_INT_FIRE);
    ADVANCE_RING();
    COMMIT_RING();

    return (ret);
}

static int radeon_wait_irq(drm_device_t *dev, int swi_nr)
{
    drm_radeon_private_t *dev_priv =
        (drm_radeon_private_t *)dev->dev_private;
    int ret = 0;

    if (RADEON_READ(RADEON_LAST_SWI_REG) >= swi_nr)
        return (0);

    dev_priv->stats.boxes |= RADEON_BOX_WAIT_IDLE;

    DRM_WAIT_ON(ret, &dev_priv->swi_queue, 3 * DRM_HZ,
        RADEON_READ(RADEON_LAST_SWI_REG) >= swi_nr);

    return (ret);
}

static int radeon_driver_vblank_do_wait(struct drm_device *dev,
                    unsigned int *sequence, int crtc)
{
    drm_radeon_private_t *dev_priv =
        (drm_radeon_private_t *)dev->dev_private;
    unsigned int cur_vblank;
    int ret = 0;
    atomic_t *counter;
    if (!dev_priv) {
        DRM_ERROR("%s called with no initialization\n", __FUNCTION__);
        return (EINVAL);
    }

    /*
     * I don't know why reset Intr Status Register here,
     * it might miss intr. So, I remove the code which
     * exists in open source, and changes as follows:
     */

    if (crtc == DRM_RADEON_VBLANK_CRTC1) {
        counter = &dev->vbl_received;
    } else if (crtc == DRM_RADEON_VBLANK_CRTC2) {
        counter = &dev->vbl_received2;
    } else
        return (EINVAL);

    dev_priv->stats.boxes |= RADEON_BOX_WAIT_IDLE;

    /*
     * Assume that the user has missed the current sequence number
     * by about a day rather than she wants to wait for years
     * using vertical blanks...
     */
    DRM_WAIT_ON(ret, &dev->vbl_queue, 3 * DRM_HZ,
        (((cur_vblank = atomic_read(counter)) - *sequence) <= (1 << 23)));

    *sequence = cur_vblank;

    return (ret);
}

int
radeon_driver_vblank_wait(struct drm_device *dev, unsigned int *sequence)
{
    return (radeon_driver_vblank_do_wait(dev, sequence,
        DRM_RADEON_VBLANK_CRTC1));
}

int
radeon_driver_vblank_wait2(struct drm_device *dev, unsigned int *sequence)
{
    return (radeon_driver_vblank_do_wait(dev, sequence,
        DRM_RADEON_VBLANK_CRTC2));
}

/*
 * Needs the lock as it touches the ring.
 */
/*ARGSUSED*/
int
radeon_irq_emit(DRM_IOCTL_ARGS)
{
    DRM_DEVICE;
    drm_radeon_private_t *dev_priv = dev->dev_private;
    drm_radeon_irq_emit_t emit;
    int result;

    LOCK_TEST_WITH_RETURN(dev, fpriv);

    if (!dev_priv) {
        DRM_ERROR("%s called with no initialization\n", __FUNCTION__);
        return (EINVAL);
    }

#ifdef _MULTI_DATAMODEL
    if (ddi_model_convert_from(mode & FMODELS) == DDI_MODEL_ILP32) {
        drm_radeon_irq_emit_32_t emit32;

        DRM_COPYFROM_WITH_RETURN(&emit32, (void *) data,
            sizeof (emit32));
        emit.irq_seq = (void *)(uintptr_t)(emit32.irq_seq);
    } else {
#endif

        DRM_COPYFROM_WITH_RETURN(&emit, (void *) data, sizeof (emit));
#ifdef _MULTI_DATAMODEL
}
#endif

    result = radeon_emit_irq(dev);

    if (DRM_COPY_TO_USER(emit.irq_seq, &result, sizeof (int))) {
        DRM_ERROR("copy_to_user\n");
        return (EFAULT);
    }

    return (0);
}

/*
 * Doesn't need the hardware lock.
 */
/*ARGSUSED*/
int
radeon_irq_wait(DRM_IOCTL_ARGS)
{
    DRM_DEVICE;
    drm_radeon_private_t *dev_priv = dev->dev_private;
    drm_radeon_irq_wait_t irqwait;

    if (!dev_priv) {
        DRM_ERROR("%s called with no initialization\n", __FUNCTION__);
        return (EINVAL);
    }

    DRM_COPYFROM_WITH_RETURN(&irqwait, (void *) data, sizeof (irqwait));

    return (radeon_wait_irq(dev, irqwait.irq_seq));
}

static void radeon_enable_interrupt(struct drm_device *dev)
{
    drm_radeon_private_t *dev_priv;

    dev_priv = (drm_radeon_private_t *)dev->dev_private;
    dev_priv->irq_enable_reg = RADEON_SW_INT_ENABLE;

    if (dev_priv->vblank_crtc & DRM_RADEON_VBLANK_CRTC1) {
        dev_priv->irq_enable_reg |= RADEON_CRTC_VBLANK_MASK;
    }

    if (dev_priv->vblank_crtc & DRM_RADEON_VBLANK_CRTC2) {
        dev_priv->irq_enable_reg |= RADEON_CRTC2_VBLANK_MASK;
    }

    RADEON_WRITE(RADEON_GEN_INT_CNTL, dev_priv->irq_enable_reg);
    dev_priv->irq_enabled = 1;
}


/*
 * drm_dma.h hooks
 */
int
radeon_driver_irq_preinstall(drm_device_t *dev)
{
    drm_radeon_private_t *dev_priv =
        (drm_radeon_private_t *)dev->dev_private;

    if (!dev_priv->mmio)
        return (EINVAL);

    /* Disable *all* interrupts */
    RADEON_WRITE(RADEON_GEN_INT_CNTL, 0);

    /* Clear bits if they're already high */
    (void) radeon_acknowledge_irqs(dev_priv,
        (RADEON_SW_INT_TEST_ACK | RADEON_CRTC_VBLANK_STAT |
        RADEON_CRTC2_VBLANK_STAT));

    return (0);
}

void
radeon_driver_irq_postinstall(drm_device_t *dev)
{
    drm_radeon_private_t *dev_priv =
        (drm_radeon_private_t *)dev->dev_private;

    atomic_set(&dev_priv->swi_emitted, 0);
    DRM_INIT_WAITQUEUE(&dev_priv->swi_queue, DRM_INTR_PRI(dev));

    radeon_enable_interrupt(dev);
}

void
radeon_driver_irq_uninstall(drm_device_t *dev)
{
    drm_radeon_private_t *dev_priv =
        (drm_radeon_private_t *)dev->dev_private;
    if (!dev_priv)
        return;

    /* Disable *all* interrupts */
    RADEON_WRITE(RADEON_GEN_INT_CNTL, 0);
    DRM_FINI_WAITQUEUE(&dev_priv->swi_queue);
}

int
radeon_vblank_crtc_get(drm_device_t *dev)
{
    drm_radeon_private_t *dev_priv;
    u32 flag;
    u32 value;

    dev_priv = (drm_radeon_private_t *)dev->dev_private;
    flag = RADEON_READ(RADEON_GEN_INT_CNTL);
    value = 0;

    if (flag & RADEON_CRTC_VBLANK_MASK)
        value |= DRM_RADEON_VBLANK_CRTC1;

    if (flag & RADEON_CRTC2_VBLANK_MASK)
        value |= DRM_RADEON_VBLANK_CRTC2;
    return (value);
}

int
radeon_vblank_crtc_set(drm_device_t *dev, int64_t value)
{
    drm_radeon_private_t *dev_priv;

    dev_priv = (drm_radeon_private_t *)dev->dev_private;
    if (value & ~(DRM_RADEON_VBLANK_CRTC1 | DRM_RADEON_VBLANK_CRTC2)) {
        DRM_ERROR("called with invalid crtc 0x%x\n",
            (unsigned int)value);
        return (EINVAL);
    }
    dev_priv->vblank_crtc = (unsigned int)value;
    radeon_enable_interrupt(dev);
    return (0);
}