sis_mm.c

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/**************************************************************************
 *
 * Copyright 2006 Tungsten Graphics, Inc., Bismarck, ND., USA.
 * All Rights Reserved.
 *
 * 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, sub license, 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 NON-INFRINGEMENT. IN NO EVENT SHALL
 * THE COPYRIGHT HOLDERS, AUTHORS 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:
 *    Thomas Hellström <thomas-at-tungstengraphics-dot-com>
 */

#include <drm/drmP.h>
#include <drm/sis_drm.h>
#include "sis_drv.h"

#include <video/sisfb.h>

#define VIDEO_TYPE 0
#define AGP_TYPE 1


struct sis_memblock {
    struct drm_mm_node mm_node;
    struct sis_memreq req;
    struct list_head owner_list;
};

#if defined(CONFIG_FB_SIS) || defined(CONFIG_FB_SIS_MODULE)
/* fb management via fb device */

#define SIS_MM_ALIGN_SHIFT 0
#define SIS_MM_ALIGN_MASK 0

#else /* CONFIG_FB_SIS[_MODULE] */

#define SIS_MM_ALIGN_SHIFT 4
#define SIS_MM_ALIGN_MASK ((1 << SIS_MM_ALIGN_SHIFT) - 1)

#endif /* CONFIG_FB_SIS[_MODULE] */

static int sis_fb_init(struct drm_device *dev, void *data, struct drm_file *file_priv)
{
    drm_sis_private_t *dev_priv = dev->dev_private;
    drm_sis_fb_t *fb = data;

    mutex_lock(&dev->struct_mutex);
    /* Unconditionally init the drm_mm, even though we don't use it when the
     * fb sis driver is available - make cleanup easier. */
    drm_mm_init(&dev_priv->vram_mm, 0, fb->size >> SIS_MM_ALIGN_SHIFT);

    dev_priv->vram_initialized = 1;
    dev_priv->vram_offset = fb->offset;

    mutex_unlock(&dev->struct_mutex);
    DRM_DEBUG("offset = %lu, size = %lu\n", fb->offset, fb->size);

    return 0;
}

static int sis_drm_alloc(struct drm_device *dev, struct drm_file *file,
             void *data, int pool)
{
    drm_sis_private_t *dev_priv = dev->dev_private;
    drm_sis_mem_t *mem = data;
    int retval = 0, user_key;
    struct sis_memblock *item;
    struct sis_file_private *file_priv = file->driver_priv;
    unsigned long offset;

    mutex_lock(&dev->struct_mutex);

    if (0 == ((pool == 0) ? dev_priv->vram_initialized :
              dev_priv->agp_initialized)) {
        DRM_ERROR
            ("Attempt to allocate from uninitialized memory manager.\n");
        mutex_unlock(&dev->struct_mutex);
        return -EINVAL;
    }

    item = kzalloc(sizeof(*item), GFP_KERNEL);
    if (!item) {
        retval = -ENOMEM;
        goto fail_alloc;
    }

    mem->size = (mem->size + SIS_MM_ALIGN_MASK) >> SIS_MM_ALIGN_SHIFT;
    if (pool == AGP_TYPE) {
        retval = drm_mm_insert_node(&dev_priv->agp_mm,
                        &item->mm_node,
                        mem->size, 0);
        offset = item->mm_node.start;
    } else {
#if defined(CONFIG_FB_SIS) || defined(CONFIG_FB_SIS_MODULE)
        item->req.size = mem->size;
        sis_malloc(&item->req);
        if (item->req.size == 0)
            retval = -ENOMEM;
        offset = item->req.offset;
#else
        retval = drm_mm_insert_node(&dev_priv->vram_mm,
                        &item->mm_node,
                        mem->size, 0);
        offset = item->mm_node.start;
#endif
    }
    if (retval)
        goto fail_alloc;

again:
    if (idr_pre_get(&dev_priv->object_idr, GFP_KERNEL) == 0) {
        retval = -ENOMEM;
        goto fail_idr;
    }

    retval = idr_get_new_above(&dev_priv->object_idr, item, 1, &user_key);
    if (retval == -EAGAIN)
        goto again;
    if (retval)
        goto fail_idr;

    list_add(&item->owner_list, &file_priv->obj_list);
    mutex_unlock(&dev->struct_mutex);

    mem->offset = ((pool == 0) ?
              dev_priv->vram_offset : dev_priv->agp_offset) +
        (offset << SIS_MM_ALIGN_SHIFT);
    mem->free = user_key;
    mem->size = mem->size << SIS_MM_ALIGN_SHIFT;

    return 0;

fail_idr:
    drm_mm_remove_node(&item->mm_node);
fail_alloc:
    kfree(item);
    mutex_unlock(&dev->struct_mutex);

    mem->offset = 0;
    mem->size = 0;
    mem->free = 0;

    DRM_DEBUG("alloc %d, size = %ld, offset = %ld\n", pool, mem->size,
          mem->offset);

    return retval;
}

static int sis_drm_free(struct drm_device *dev, void *data, struct drm_file *file_priv)
{
    drm_sis_private_t *dev_priv = dev->dev_private;
    drm_sis_mem_t *mem = data;
    struct sis_memblock *obj;

    mutex_lock(&dev->struct_mutex);
    obj = idr_find(&dev_priv->object_idr, mem->free);
    if (obj == NULL) {
        mutex_unlock(&dev->struct_mutex);
        return -EINVAL;
    }

    idr_remove(&dev_priv->object_idr, mem->free);
    list_del(&obj->owner_list);
    if (drm_mm_node_allocated(&obj->mm_node))
        drm_mm_remove_node(&obj->mm_node);
#if defined(CONFIG_FB_SIS) || defined(CONFIG_FB_SIS_MODULE)
    else
        sis_free(obj->req.offset);
#endif
    kfree(obj);
    mutex_unlock(&dev->struct_mutex);
    DRM_DEBUG("free = 0x%lx\n", mem->free);

    return 0;
}

static int sis_fb_alloc(struct drm_device *dev, void *data,
            struct drm_file *file_priv)
{
    return sis_drm_alloc(dev, file_priv, data, VIDEO_TYPE);
}

static int sis_ioctl_agp_init(struct drm_device *dev, void *data,
                  struct drm_file *file_priv)
{
    drm_sis_private_t *dev_priv = dev->dev_private;
    drm_sis_agp_t *agp = data;
    dev_priv = dev->dev_private;

    mutex_lock(&dev->struct_mutex);
    drm_mm_init(&dev_priv->agp_mm, 0, agp->size >> SIS_MM_ALIGN_SHIFT);

    dev_priv->agp_initialized = 1;
    dev_priv->agp_offset = agp->offset;
    mutex_unlock(&dev->struct_mutex);

    DRM_DEBUG("offset = %lu, size = %lu\n", agp->offset, agp->size);
    return 0;
}

static int sis_ioctl_agp_alloc(struct drm_device *dev, void *data,
                   struct drm_file *file_priv)
{

    return sis_drm_alloc(dev, file_priv, data, AGP_TYPE);
}

static drm_local_map_t *sis_reg_init(struct drm_device *dev)
{
    struct drm_map_list *entry;
    drm_local_map_t *map;

    list_for_each_entry(entry, &dev->maplist, head) {
        map = entry->map;
        if (!map)
            continue;
        if (map->type == _DRM_REGISTERS)
            return map;
    }
    return NULL;
}

int sis_idle(struct drm_device *dev)
{
    drm_sis_private_t *dev_priv = dev->dev_private;
    uint32_t idle_reg;
    unsigned long end;
    int i;

    if (dev_priv->idle_fault)
        return 0;

    if (dev_priv->mmio == NULL) {
        dev_priv->mmio = sis_reg_init(dev);
        if (dev_priv->mmio == NULL) {
            DRM_ERROR("Could not find register map.\n");
            return 0;
        }
    }

    /*
     * Implement a device switch here if needed
     */

    if (dev_priv->chipset != SIS_CHIP_315)
        return 0;

    /*
     * Timeout after 3 seconds. We cannot use DRM_WAIT_ON here
     * because its polling frequency is too low.
     */

    end = jiffies + (DRM_HZ * 3);

    for (i = 0; i < 4; ++i) {
        do {
            idle_reg = SIS_READ(0x85cc);
        } while (!time_after_eq(jiffies, end) &&
              ((idle_reg & 0x80000000) != 0x80000000));
    }

    if (time_after_eq(jiffies, end)) {
        DRM_ERROR("Graphics engine idle timeout. "
              "Disabling idle check\n");
        dev_priv->idle_fault = 1;
    }

    /*
     * The caller never sees an error code. It gets trapped
     * in libdrm.
     */

    return 0;
}


void sis_lastclose(struct drm_device *dev)
{
    drm_sis_private_t *dev_priv = dev->dev_private;

    if (!dev_priv)
        return;

    mutex_lock(&dev->struct_mutex);
    if (dev_priv->vram_initialized) {
        drm_mm_takedown(&dev_priv->vram_mm);
        dev_priv->vram_initialized = 0;
    }
    if (dev_priv->agp_initialized) {
        drm_mm_takedown(&dev_priv->agp_mm);
        dev_priv->agp_initialized = 0;
    }
    dev_priv->mmio = NULL;
    mutex_unlock(&dev->struct_mutex);
}

void sis_reclaim_buffers_locked(struct drm_device *dev,
                struct drm_file *file)
{
    struct sis_file_private *file_priv = file->driver_priv;
    struct sis_memblock *entry, *next;

    if (!(file->minor->master && file->master->lock.hw_lock))
        return;

    drm_idlelock_take(&file->master->lock);

    mutex_lock(&dev->struct_mutex);
    if (list_empty(&file_priv->obj_list)) {
        mutex_unlock(&dev->struct_mutex);
        drm_idlelock_release(&file->master->lock);

        return;
    }

    sis_idle(dev);


    list_for_each_entry_safe(entry, next, &file_priv->obj_list,
                 owner_list) {
        list_del(&entry->owner_list);
        if (drm_mm_node_allocated(&entry->mm_node))
            drm_mm_remove_node(&entry->mm_node);
#if defined(CONFIG_FB_SIS) || defined(CONFIG_FB_SIS_MODULE)
        else
            sis_free(entry->req.offset);
#endif
        kfree(entry);
    }
    mutex_unlock(&dev->struct_mutex);

    drm_idlelock_release(&file->master->lock);

    return;
}

struct drm_ioctl_desc sis_ioctls[] = {
    DRM_IOCTL_DEF_DRV(SIS_FB_ALLOC, sis_fb_alloc, DRM_AUTH),
    DRM_IOCTL_DEF_DRV(SIS_FB_FREE, sis_drm_free, DRM_AUTH),
    DRM_IOCTL_DEF_DRV(SIS_AGP_INIT, sis_ioctl_agp_init, DRM_AUTH | DRM_MASTER | DRM_ROOT_ONLY),
    DRM_IOCTL_DEF_DRV(SIS_AGP_ALLOC, sis_ioctl_agp_alloc, DRM_AUTH),
    DRM_IOCTL_DEF_DRV(SIS_AGP_FREE, sis_drm_free, DRM_AUTH),
    DRM_IOCTL_DEF_DRV(SIS_FB_INIT, sis_fb_init, DRM_AUTH | DRM_MASTER | DRM_ROOT_ONLY),
};

int sis_max_ioctl = DRM_ARRAY_SIZE(sis_ioctls);