mga_dma.c

linux-2.6.15.6

 * decrease the request size by a single page each pass through the loop.
 *
 * \todo
 * Determine whether the maximum address passed to drm_pci_alloc is correct.
 * The same goes for drm_addbufs_pci.
 *
 * \sa mga_do_dma_bootstrap, mga_do_agp_dma_bootstrap
 */
static int mga_do_pci_dma_bootstrap(drm_device_t * dev,
				    drm_mga_dma_bootstrap_t * dma_bs)
{
	drm_mga_private_t *const dev_priv =
	    (drm_mga_private_t *) dev->dev_private;
	unsigned int warp_size = mga_warp_microcode_size(dev_priv);
	unsigned int primary_size;
	unsigned int bin_count;
	int err;
	drm_buf_desc_t req;

	if (dev->dma == NULL) {
		DRM_ERROR("dev->dma is NULL\n");
		return DRM_ERR(EFAULT);
	}

	/* Make drm_addbufs happy by not trying to create a mapping for less
	 * than a page.
	 */
	if (warp_size < PAGE_SIZE)
		warp_size = PAGE_SIZE;

	/* The proper alignment is 0x100 for this mapping */
	err = drm_addmap(dev, 0, warp_size, _DRM_CONSISTENT,
			 _DRM_READ_ONLY, &dev_priv->warp);
	if (err != 0) {
		DRM_ERROR("Unable to create mapping for WARP microcode\n");
		return err;
	}

	/* Other than the bottom two bits being used to encode other
	 * information, there don't appear to be any restrictions on the
	 * alignment of the primary or secondary DMA buffers.
	 */

	for (primary_size = dma_bs->primary_size; primary_size != 0;
	     primary_size >>= 1) {
		/* The proper alignment for this mapping is 0x04 */
		err = drm_addmap(dev, 0, primary_size, _DRM_CONSISTENT,
				 _DRM_READ_ONLY, &dev_priv->primary);
		if (!err)
			break;
	}

	if (err != 0) {
		DRM_ERROR("Unable to allocate primary DMA region\n");
		return DRM_ERR(ENOMEM);
	}

	if (dev_priv->primary->size != dma_bs->primary_size) {
		DRM_INFO("Primary DMA buffer size reduced from %u to %u.\n",
			 dma_bs->primary_size,
			 (unsigned)dev_priv->primary->size);
		dma_bs->primary_size = dev_priv->primary->size;
	}

	for (bin_count = dma_bs->secondary_bin_count; bin_count > 0;
	     bin_count--) {
		(void)memset(&req, 0, sizeof(req));
		req.count = bin_count;
		req.size = dma_bs->secondary_bin_size;

		err = drm_addbufs_pci(dev, &req);
		if (!err) {
			break;
		}
	}

	if (bin_count == 0) {
		DRM_ERROR("Unable to add secondary DMA buffers\n");
		return err;
	}

	if (bin_count != dma_bs->secondary_bin_count) {
		DRM_INFO("Secondary PCI DMA buffer bin count reduced from %u "
			 "to %u.\n", dma_bs->secondary_bin_count, bin_count);

		dma_bs->secondary_bin_count = bin_count;
	}

	dev_priv->dma_access = 0;
	dev_priv->wagp_enable = 0;

	dma_bs->agp_mode = 0;

	DRM_INFO("Initialized card for PCI DMA.\n");
	return 0;
}

static int mga_do_dma_bootstrap(drm_device_t * dev,
				drm_mga_dma_bootstrap_t * dma_bs)
{
	const int is_agp = (dma_bs->agp_mode != 0) && drm_device_is_agp(dev);
	int err;
	drm_mga_private_t *const dev_priv =
	    (drm_mga_private_t *) dev->dev_private;

	dev_priv->used_new_dma_init = 1;

	/* The first steps are the same for both PCI and AGP based DMA.  Map
	 * the cards MMIO registers and map a status page.
	 */
	err = drm_addmap(dev, dev_priv->mmio_base, dev_priv->mmio_size,
			 _DRM_REGISTERS, _DRM_READ_ONLY, &dev_priv->mmio);
	if (err) {
		DRM_ERROR("Unable to map MMIO region\n");
		return err;
	}

	err = drm_addmap(dev, 0, SAREA_MAX, _DRM_SHM,
			 _DRM_READ_ONLY | _DRM_LOCKED | _DRM_KERNEL,
			 &dev_priv->status);
	if (err) {
		DRM_ERROR("Unable to map status region\n");
		return err;
	}

	/* The DMA initialization procedure is slightly different for PCI and
	 * AGP cards.  AGP cards just allocate a large block of AGP memory and
	 * carve off portions of it for internal uses.  The remaining memory
	 * is returned to user-mode to be used for AGP textures.
	 */
	if (is_agp) {
		err = mga_do_agp_dma_bootstrap(dev, dma_bs);
	}

	/* If we attempted to initialize the card for AGP DMA but failed,
	 * clean-up any mess that may have been created.
	 */

	if (err) {
		mga_do_cleanup_dma(dev);
	}

	/* Not only do we want to try and initialized PCI cards for PCI DMA,
	 * but we also try to initialized AGP cards that could not be
	 * initialized for AGP DMA.  This covers the case where we have an AGP
	 * card in a system with an unsupported AGP chipset.  In that case the
	 * card will be detected as AGP, but we won't be able to allocate any
	 * AGP memory, etc.
	 */

	if (!is_agp || err) {
		err = mga_do_pci_dma_bootstrap(dev, dma_bs);
	}

	return err;
}

int mga_dma_bootstrap(DRM_IOCTL_ARGS)
{
	DRM_DEVICE;
	drm_mga_dma_bootstrap_t bootstrap;
	int err;

	DRM_COPY_FROM_USER_IOCTL(bootstrap,
				 (drm_mga_dma_bootstrap_t __user *) data,
				 sizeof(bootstrap));

	err = mga_do_dma_bootstrap(dev, &bootstrap);
	if (!err) {
		static const int modes[] = { 0, 1, 2, 2, 4, 4, 4, 4 };
		const drm_mga_private_t *const dev_priv =
		    (drm_mga_private_t *) dev->dev_private;

		if (dev_priv->agp_textures != NULL) {
			bootstrap.texture_handle =
			    dev_priv->agp_textures->offset;
			bootstrap.texture_size = dev_priv->agp_textures->size;
		} else {
			bootstrap.texture_handle = 0;
			bootstrap.texture_size = 0;
		}

		bootstrap.agp_mode = modes[bootstrap.agp_mode & 0x07];
		if (DRM_COPY_TO_USER((void __user *)data, &bootstrap,
				     sizeof(bootstrap))) {
			err = DRM_ERR(EFAULT);
		}
	} else {
		mga_do_cleanup_dma(dev);
	}

	return err;
}

static int mga_do_init_dma(drm_device_t * dev, drm_mga_init_t * init)
{
	drm_mga_private_t *dev_priv;
	int ret;
	DRM_DEBUG("\n");

	dev_priv = dev->dev_private;

	if (init->sgram) {
		dev_priv->clear_cmd = MGA_DWGCTL_CLEAR | MGA_ATYPE_BLK;
	} else {
		dev_priv->clear_cmd = MGA_DWGCTL_CLEAR | MGA_ATYPE_RSTR;
	}
	dev_priv->maccess = init->maccess;

	dev_priv->fb_cpp = init->fb_cpp;
	dev_priv->front_offset = init->front_offset;
	dev_priv->front_pitch = init->front_pitch;
	dev_priv->back_offset = init->back_offset;
	dev_priv->back_pitch = init->back_pitch;

	dev_priv->depth_cpp = init->depth_cpp;
	dev_priv->depth_offset = init->depth_offset;
	dev_priv->depth_pitch = init->depth_pitch;

	/* FIXME: Need to support AGP textures...
	 */
	dev_priv->texture_offset = init->texture_offset[0];
	dev_priv->texture_size = init->texture_size[0];

	DRM_GETSAREA();

	if (!dev_priv->sarea) {
		DRM_ERROR("failed to find sarea!\n");
		return DRM_ERR(EINVAL);
	}

	if (!dev_priv->used_new_dma_init) {

		dev_priv->dma_access = MGA_PAGPXFER;
		dev_priv->wagp_enable = MGA_WAGP_ENABLE;

		dev_priv->status = drm_core_findmap(dev, init->status_offset);
		if (!dev_priv->status) {
			DRM_ERROR("failed to find status page!\n");
			return DRM_ERR(EINVAL);
		}
		dev_priv->mmio = drm_core_findmap(dev, init->mmio_offset);
		if (!dev_priv->mmio) {
			DRM_ERROR("failed to find mmio region!\n");
			return DRM_ERR(EINVAL);
		}
		dev_priv->warp = drm_core_findmap(dev, init->warp_offset);
		if (!dev_priv->warp) {
			DRM_ERROR("failed to find warp microcode region!\n");
			return DRM_ERR(EINVAL);
		}
		dev_priv->primary = drm_core_findmap(dev, init->primary_offset);
		if (!dev_priv->primary) {
			DRM_ERROR("failed to find primary dma region!\n");
			return DRM_ERR(EINVAL);
		}
		dev->agp_buffer_token = init->buffers_offset;
		dev->agp_buffer_map =
		    drm_core_findmap(dev, init->buffers_offset);
		if (!dev->agp_buffer_map) {
			DRM_ERROR("failed to find dma buffer region!\n");
			return DRM_ERR(EINVAL);
		}

		drm_core_ioremap(dev_priv->warp, dev);
		drm_core_ioremap(dev_priv->primary, dev);
		drm_core_ioremap(dev->agp_buffer_map, dev);
	}

	dev_priv->sarea_priv =
	    (drm_mga_sarea_t *) ((u8 *) dev_priv->sarea->handle +
				 init->sarea_priv_offset);

	if (!dev_priv->warp->handle ||
	    !dev_priv->primary->handle ||
	    ((dev_priv->dma_access != 0) &&
	     ((dev->agp_buffer_map == NULL) ||
	      (dev->agp_buffer_map->handle == NULL)))) {
		DRM_ERROR("failed to ioremap agp regions!\n");
		return DRM_ERR(ENOMEM);
	}

	ret = mga_warp_install_microcode(dev_priv);
	if (ret < 0) {
		DRM_ERROR("failed to install WARP ucode!\n");
		return ret;
	}

	ret = mga_warp_init(dev_priv);
	if (ret < 0) {
		DRM_ERROR("failed to init WARP engine!\n");
		return ret;
	}

	dev_priv->prim.status = (u32 *) dev_priv->status->handle;

	mga_do_wait_for_idle(dev_priv);

	/* Init the primary DMA registers.
	 */
	MGA_WRITE(MGA_PRIMADDRESS, dev_priv->primary->offset | MGA_DMA_GENERAL);
#if 0
	MGA_WRITE(MGA_PRIMPTR, virt_to_bus((void *)dev_priv->prim.status) | MGA_PRIMPTREN0 |	/* Soft trap, SECEND, SETUPEND */
		  MGA_PRIMPTREN1);	/* DWGSYNC */
#endif

	dev_priv->prim.start = (u8 *) dev_priv->primary->handle;
	dev_priv->prim.end = ((u8 *) dev_priv->primary->handle
			      + dev_priv->primary->size);
	dev_priv->prim.size = dev_priv->primary->size;

	dev_priv->prim.tail = 0;
	dev_priv->prim.space = dev_priv->prim.size;
	dev_priv->prim.wrapped = 0;

	dev_priv->prim.last_flush = 0;
	dev_priv->prim.last_wrap = 0;

	dev_priv->prim.high_mark = 256 * DMA_BLOCK_SIZE;

	dev_priv->prim.status[0] = dev_priv->primary->offset;
	dev_priv->prim.status[1] = 0;

	dev_priv->sarea_priv->last_wrap = 0;
	dev_priv->sarea_priv->last_frame.head = 0;
	dev_priv->sarea_priv->last_frame.wrap = 0;

	if (mga_freelist_init(dev, dev_priv) < 0) {
		DRM_ERROR("could not initialize freelist\n");
		return DRM_ERR(ENOMEM);
	}

	return 0;
}

static int mga_do_cleanup_dma(drm_device_t * dev)
{
	int err = 0;
	DRM_DEBUG("\n");

	/* Make sure interrupts are disabled here because the uninstall ioctl
	 * may not have been called from userspace and after dev_private
	 * is freed, it's too late.
	 */
	if (dev->irq_enabled)
		drm_irq_uninstall(dev);

	if (dev->dev_private) {
		drm_mga_private_t *dev_priv = dev->dev_private;

		if ((dev_priv->warp != NULL)
		    && (dev_priv->warp->type != _DRM_CONSISTENT))
			drm_core_ioremapfree(dev_priv->warp, dev);

		if ((dev_priv->primary != NULL)
		    && (dev_priv->primary->type != _DRM_CONSISTENT))
			drm_core_ioremapfree(dev_priv->primary, dev);

		if (dev->agp_buffer_map != NULL)
			drm_core_ioremapfree(dev->agp_buffer_map, dev);

		if (dev_priv->used_new_dma_init) {
#if __OS_HAS_AGP
			if (dev_priv->agp_mem != NULL) {
				dev_priv->agp_textures = NULL;
				drm_unbind_agp(dev_priv->agp_mem);

				drm_free_agp(dev_priv->agp_mem,
					     dev_priv->agp_pages);
				dev_priv->agp_pages = 0;
				dev_priv->agp_mem = NULL;
			}

			if ((dev->agp != NULL) && dev->agp->acquired) {
				err = drm_agp_release(dev);
			}
#endif
			dev_priv->used_new_dma_init = 0;
		}

		dev_priv->warp = NULL;
		dev_priv->primary = NULL;
		dev_priv->mmio = NULL;
		dev_priv->status = NULL;
		dev_priv->sarea = NULL;
		dev_priv->sarea_priv = NULL;
		dev->agp_buffer_map = NULL;

		memset(&dev_priv->prim, 0, sizeof(dev_priv->prim));
		dev_priv->warp_pipe = 0;
		memset(dev_priv->warp_pipe_phys, 0,
		       sizeof(dev_priv->warp_pipe_phys));

		if (dev_priv->head != NULL) {
			mga_freelist_cleanup(dev);
		}
	}

	return err;
}

int mga_dma_init(DRM_IOCTL_ARGS)
{
	DRM_DEVICE;
	drm_mga_init_t init;
	int err;

	LOCK_TEST_WITH_RETURN(dev, filp);

	DRM_COPY_FROM_USER_IOCTL(init, (drm_mga_init_t __user *) data,
				 sizeof(init));

	switch (init.func) {
	case MGA_INIT_DMA:
		err = mga_do_init_dma(dev, &init);
		if (err) {
			(void)mga_do_cleanup_dma(dev);
		}
		return err;
	case MGA_CLEANUP_DMA:
		return mga_do_cleanup_dma(dev);
	}

	return DRM_ERR(EINVAL);
}

/* ================================================================
 * Primary DMA stream management
 */

int mga_dma_flush(DRM_IOCTL_ARGS)
{
	DRM_DEVICE;
	drm_mga_private_t *dev_priv = (drm_mga_private_t *) dev->dev_private;
	drm_lock_t lock;

	LOCK_TEST_WITH_RETURN(dev, filp);

	DRM_COPY_FROM_USER_IOCTL(lock, (drm_lock_t __user *) data,
				 sizeof(lock));

	DRM_DEBUG("%s%s%s\n",
		  (lock.flags & _DRM_LOCK_FLUSH) ? "flush, " : "",
		  (lock.flags & _DRM_LOCK_FLUSH_ALL) ? "flush all, " : "",
		  (lock.flags & _DRM_LOCK_QUIESCENT) ? "idle, " : "");

	WRAP_WAIT_WITH_RETURN(dev_priv);

	if (lock.flags & (_DRM_LOCK_FLUSH | _DRM_LOCK_FLUSH_ALL)) {
		mga_do_dma_flush(dev_priv);
	}

	if (lock.flags & _DRM_LOCK_QUIESCENT) {
#if MGA_DMA_DEBUG
		int ret = mga_do_wait_for_idle(dev_priv);
		if (ret < 0)
			DRM_INFO("%s: -EBUSY\n", __FUNCTION__);
		return ret;
#else
		return mga_do_wait_for_idle(dev_priv);
#endif
	} else {
		return 0;
	}
}

int mga_dma_reset(DRM_IOCTL_ARGS)
{
	DRM_DEVICE;
	drm_mga_private_t *dev_priv = (drm_mga_private_t *) dev->dev_private;

	LOCK_TEST_WITH_RETURN(dev, filp);

	return mga_do_dma_reset(dev_priv);
}

/* ================================================================
 * DMA buffer management
 */

static int mga_dma_get_buffers(DRMFILE filp, drm_device_t * dev, drm_dma_t * d)
{
	drm_buf_t *buf;
	int i;

	for (i = d->granted_count; i < d->request_count; i++) {
		buf = mga_freelist_get(dev);
		if (!buf)
			return DRM_ERR(EAGAIN);

		buf->filp = filp;

		if (DRM_COPY_TO_USER(&d->request_indices[i],
				     &buf->idx, sizeof(buf->idx)))
			return DRM_ERR(EFAULT);
		if (DRM_COPY_TO_USER(&d->request_sizes[i],
				     &buf->total, sizeof(buf->total)))
			return DRM_ERR(EFAULT);

		d->granted_count++;
	}
	return 0;
}

int mga_dma_buffers(DRM_IOCTL_ARGS)
{
	DRM_DEVICE;
	drm_device_dma_t *dma = dev->dma;
	drm_mga_private_t *dev_priv = (drm_mga_private_t *) dev->dev_private;
	drm_dma_t __user *argp = (void __user *)data;
	drm_dma_t d;
	int ret = 0;

	LOCK_TEST_WITH_RETURN(dev, filp);

	DRM_COPY_FROM_USER_IOCTL(d, argp, sizeof(d));

	/* Please don't send us buffers.
	 */
	if (d.send_count != 0) {
		DRM_ERROR("Process %d trying to send %d buffers via drmDMA\n",
			  DRM_CURRENTPID, d.send_count);
		return DRM_ERR(EINVAL);
	}

	/* We'll send you buffers.
	 */
	if (d.request_count < 0 || d.request_count > dma->buf_count) {
		DRM_ERROR("Process %d trying to get %d buffers (of %d max)\n",
			  DRM_CURRENTPID, d.request_count, dma->buf_count);
		return DRM_ERR(EINVAL);
	}

	WRAP_TEST_WITH_RETURN(dev_priv);

	d.granted_count = 0;

	if (d.request_count) {
		ret = mga_dma_get_buffers(filp, dev, &d);
	}

	DRM_COPY_TO_USER_IOCTL(argp, d, sizeof(d));

	return ret;
}

/**
 * Called just before the module is unloaded.
 */
int mga_driver_postcleanup(drm_device_t * dev)
{
	drm_free(dev->dev_private, sizeof(drm_mga_private_t), DRM_MEM_DRIVER);
	dev->dev_private = NULL;

	return 0;
}

/**
 * Called when the last opener of the device is closed.
 */
void mga_driver_pretakedown(drm_device_t * dev)
{
	mga_do_cleanup_dma(dev);
}

int mga_driver_dma_quiescent(drm_device_t * dev)
{
	drm_mga_private_t *dev_priv = dev->dev_private;
	return mga_do_wait_for_idle(dev_priv);
}