1 files changed, 284 insertions, 10 deletions

diff --git a/drivers/char/drm/drm_drawable.c b/drivers/char/drm/drm_drawable.c
index 7857453c4f48..de37d5f74563 100644
--- a/drivers/char/drm/drm_drawable.c
+++ b/drivers/char/drm/drm_drawable.c
@@ -4,6 +4,7 @@
  *
  * \author Rickard E. (Rik) Faith <faith@valinux.com>
  * \author Gareth Hughes <gareth@valinux.com>
+ * \author Michel Dänzer <michel@tungstengraphics.com>
  */
 
 /*
@@ -11,6 +12,7 @@
  *
  * Copyright 1999 Precision Insight, Inc., Cedar Park, Texas.
  * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
+ * Copyright 2006 Tungsten Graphics, Inc., Bismarck, North Dakota.
  * All Rights Reserved.
  *
  * Permission is hereby granted, free of charge, to any person obtaining a
@@ -35,22 +37,294 @@
 
 #include "drmP.h"
 
-/** No-op. */
-int drm_adddraw(struct inode *inode, struct file *filp,
-                unsigned int cmd, unsigned long arg)
+/**
+ * Allocate drawable ID and memory to store information about it.
+ */
+int drm_adddraw(DRM_IOCTL_ARGS)
 {
+        DRM_DEVICE;
+        unsigned long irqflags;
+        int i, j;
+        u32 *bitfield = dev->drw_bitfield;
+        unsigned int bitfield_length = dev->drw_bitfield_length;
+        drm_drawable_info_t **info = dev->drw_info;
+        unsigned int info_length = dev->drw_info_length;
         drm_draw_t draw;
 
-        draw.handle = 0;        /* NOOP */
+        for (i = 0, j = 0; i < bitfield_length; i++) {
+                if (bitfield[i] == ~0)
+                        continue;
+
+                for (; j < 8 * sizeof(*bitfield); j++)
+                        if (!(bitfield[i] & (1 << j)))
+                                goto done;
+        }
+done:
+
+        if (i == bitfield_length) {
+                bitfield_length++;
+
+                bitfield = drm_alloc(bitfield_length * sizeof(*bitfield),
+                                     DRM_MEM_BUFS);
+
+                if (!bitfield) {
+                        DRM_ERROR("Failed to allocate new drawable bitfield\n");
+                        return DRM_ERR(ENOMEM);
+                }
+
+                if (8 * sizeof(*bitfield) * bitfield_length > info_length) {
+                        info_length += 8 * sizeof(*bitfield);
+
+                        info = drm_alloc(info_length * sizeof(*info),
+                                         DRM_MEM_BUFS);
+
+                        if (!info) {
+                                DRM_ERROR("Failed to allocate new drawable info"
+                                          " array\n");
+
+                                drm_free(bitfield,
+                                         bitfield_length * sizeof(*bitfield),
+                                         DRM_MEM_BUFS);
+                                return DRM_ERR(ENOMEM);
+                        }
+                }
+
+                bitfield[i] = 0;
+        }
+
+        draw.handle = i * 8 * sizeof(*bitfield) + j + 1;
         DRM_DEBUG("%d\n", draw.handle);
-        if (copy_to_user((drm_draw_t __user *) arg, &draw, sizeof(draw)))
-                return -EFAULT;
+
+        spin_lock_irqsave(&dev->drw_lock, irqflags);
+
+        bitfield[i] |= 1 << j;
+        info[draw.handle - 1] = NULL;
+
+        if (bitfield != dev->drw_bitfield) {
+                memcpy(bitfield, dev->drw_bitfield, dev->drw_bitfield_length *
+                       sizeof(*bitfield));
+                drm_free(dev->drw_bitfield, sizeof(*bitfield) *
+                         dev->drw_bitfield_length, DRM_MEM_BUFS);
+                dev->drw_bitfield = bitfield;
+                dev->drw_bitfield_length = bitfield_length;
+        }
+
+        if (info != dev->drw_info) {
+                memcpy(info, dev->drw_info, dev->drw_info_length *
+                       sizeof(*info));
+                drm_free(dev->drw_info, sizeof(*info) * dev->drw_info_length,
+                         DRM_MEM_BUFS);
+                dev->drw_info = info;
+                dev->drw_info_length = info_length;
+        }
+
+        spin_unlock_irqrestore(&dev->drw_lock, irqflags);
+
+        DRM_COPY_TO_USER_IOCTL((drm_draw_t __user *)data, draw, sizeof(draw));
+
         return 0;
 }
 
-/** No-op. */
-int drm_rmdraw(struct inode *inode, struct file *filp,
-               unsigned int cmd, unsigned long arg)
+/**
+ * Free drawable ID and memory to store information about it.
+ */
+int drm_rmdraw(DRM_IOCTL_ARGS)
 {
-        return 0;               /* NOOP */
+        DRM_DEVICE;
+        drm_draw_t draw;
+        int id, idx;
+        unsigned int shift;
+        unsigned long irqflags;
+        u32 *bitfield = dev->drw_bitfield;
+        unsigned int bitfield_length = dev->drw_bitfield_length;
+        drm_drawable_info_t **info = dev->drw_info;
+        unsigned int info_length = dev->drw_info_length;
+
+        DRM_COPY_FROM_USER_IOCTL(draw, (drm_draw_t __user *) data,
+                                 sizeof(draw));
+
+        id = draw.handle - 1;
+        idx = id / (8 * sizeof(*bitfield));
+        shift = id % (8 * sizeof(*bitfield));
+
+        if (idx < 0 || idx >= bitfield_length ||
+            !(bitfield[idx] & (1 << shift))) {
+                DRM_DEBUG("No such drawable %d\n", draw.handle);
+                return 0;
+        }
+
+        spin_lock_irqsave(&dev->drw_lock, irqflags);
+
+        bitfield[idx] &= ~(1 << shift);
+
+        spin_unlock_irqrestore(&dev->drw_lock, irqflags);
+
+        if (info[id]) {
+                drm_free(info[id]->rects, info[id]->num_rects *
+                         sizeof(drm_clip_rect_t), DRM_MEM_BUFS);
+                drm_free(info[id], sizeof(**info), DRM_MEM_BUFS);
+        }
+
+        /* Can we shrink the arrays? */
+        if (idx == bitfield_length - 1) {
+                while (idx >= 0 && !bitfield[idx])
+                        --idx;
+
+                bitfield_length = idx + 1;
+
+                if (idx != id / (8 * sizeof(*bitfield)))
+                        bitfield = drm_alloc(bitfield_length *
+                                             sizeof(*bitfield), DRM_MEM_BUFS);
+
+                if (!bitfield && bitfield_length) {
+                        bitfield = dev->drw_bitfield;
+                        bitfield_length = dev->drw_bitfield_length;
+                }
+        }
+
+        if (bitfield != dev->drw_bitfield) {
+                info_length = 8 * sizeof(*bitfield) * bitfield_length;
+
+                info = drm_alloc(info_length * sizeof(*info), DRM_MEM_BUFS);
+
+                if (!info && info_length) {
+                        info = dev->drw_info;
+                        info_length = dev->drw_info_length;
+                }
+
+                spin_lock_irqsave(&dev->drw_lock, irqflags);
+
+                memcpy(bitfield, dev->drw_bitfield, bitfield_length *
+                       sizeof(*bitfield));
+                drm_free(dev->drw_bitfield, sizeof(*bitfield) *
+                         dev->drw_bitfield_length, DRM_MEM_BUFS);
+                dev->drw_bitfield = bitfield;
+                dev->drw_bitfield_length = bitfield_length;
+
+                if (info != dev->drw_info) {
+                        memcpy(info, dev->drw_info, info_length *
+                               sizeof(*info));
+                        drm_free(dev->drw_info, sizeof(*info) *
+                                 dev->drw_info_length, DRM_MEM_BUFS);
+                        dev->drw_info = info;
+                        dev->drw_info_length = info_length;
+                }
+
+                spin_unlock_irqrestore(&dev->drw_lock, irqflags);
+        }
+
+        DRM_DEBUG("%d\n", draw.handle);
+        return 0;
+}
+
+int drm_update_drawable_info(DRM_IOCTL_ARGS) {
+        DRM_DEVICE;
+        drm_update_draw_t update;
+        unsigned int id, idx, shift;
+        u32 *bitfield = dev->drw_bitfield;
+        unsigned long irqflags, bitfield_length = dev->drw_bitfield_length;
+        drm_drawable_info_t *info;
+        drm_clip_rect_t *rects;
+        int err;
+
+        DRM_COPY_FROM_USER_IOCTL(update, (drm_update_draw_t __user *) data,
+                                 sizeof(update));
+
+        id = update.handle - 1;
+        idx = id / (8 * sizeof(*bitfield));
+        shift = id % (8 * sizeof(*bitfield));
+
+        if (idx < 0 || idx >= bitfield_length ||
+            !(bitfield[idx] & (1 << shift))) {
+                DRM_ERROR("No such drawable %d\n", update.handle);
+                return DRM_ERR(EINVAL);
+        }
+
+        info = dev->drw_info[id];
+
+        if (!info) {
+                info = drm_calloc(1, sizeof(drm_drawable_info_t), DRM_MEM_BUFS);
+
+                if (!info) {
+                        DRM_ERROR("Failed to allocate drawable info memory\n");
+                        return DRM_ERR(ENOMEM);
+                }
+        }
+
+        switch (update.type) {
+        case DRM_DRAWABLE_CLIPRECTS:
+                if (update.num != info->num_rects) {
+                        rects = drm_alloc(update.num * sizeof(drm_clip_rect_t),
+                                         DRM_MEM_BUFS);
+                } else
+                        rects = info->rects;
+
+                if (update.num && !rects) {
+                        DRM_ERROR("Failed to allocate cliprect memory\n");
+                        err = DRM_ERR(ENOMEM);
+                        goto error;
+                }
+
+                if (update.num && DRM_COPY_FROM_USER(rects,
+                                                     (drm_clip_rect_t __user *)
+                                                     (unsigned long)update.data,
+                                                     update.num *
+                                                     sizeof(*rects))) {
+                        DRM_ERROR("Failed to copy cliprects from userspace\n");
+                        err = DRM_ERR(EFAULT);
+                        goto error;
+                }
+
+                spin_lock_irqsave(&dev->drw_lock, irqflags);
+
+                if (rects != info->rects) {
+                        drm_free(info->rects, info->num_rects *
+                                 sizeof(drm_clip_rect_t), DRM_MEM_BUFS);
+                }
+
+                info->rects = rects;
+                info->num_rects = update.num;
+                dev->drw_info[id] = info;
+
+                spin_unlock_irqrestore(&dev->drw_lock, irqflags);
+
+                DRM_DEBUG("Updated %d cliprects for drawable %d\n",
+                          info->num_rects, id);
+                break;
+        default:
+                DRM_ERROR("Invalid update type %d\n", update.type);
+                return DRM_ERR(EINVAL);
+        }
+
+        return 0;
+
+error:
+        if (!dev->drw_info[id])
+                drm_free(info, sizeof(*info), DRM_MEM_BUFS);
+        else if (rects != dev->drw_info[id]->rects)
+                drm_free(rects, update.num *
+                         sizeof(drm_clip_rect_t), DRM_MEM_BUFS);
+
+        return err;
+}
+
+/**
+ * Caller must hold the drawable spinlock!
+ */
+drm_drawable_info_t *drm_get_drawable_info(drm_device_t *dev, drm_drawable_t id) {
+        u32 *bitfield = dev->drw_bitfield;
+        unsigned int idx, shift;
+
+        id--;
+        idx = id / (8 * sizeof(*bitfield));
+        shift = id % (8 * sizeof(*bitfield));
+
+        if (idx < 0 || idx >= dev->drw_bitfield_length ||
+            !(bitfield[idx] & (1 << shift))) {
+                DRM_DEBUG("No such drawable %d\n", id);
+                return NULL;
+        }
+
+        return dev->drw_info[id];
 }
+EXPORT_SYMBOL(drm_get_drawable_info);