diff options
Diffstat (limited to 'kernel/drivers/gpu/drm/drm_dma.c')
| -rw-r--r-- | kernel/drivers/gpu/drm/drm_dma.c | 169 |
1 files changed, 169 insertions, 0 deletions
diff --git a/kernel/drivers/gpu/drm/drm_dma.c b/kernel/drivers/gpu/drm/drm_dma.c new file mode 100644 index 000000000..ea481800e --- /dev/null +++ b/kernel/drivers/gpu/drm/drm_dma.c @@ -0,0 +1,169 @@ +/** + * \file drm_dma.c + * DMA IOCTL and function support + * + * \author Rickard E. (Rik) Faith <faith@valinux.com> + * \author Gareth Hughes <gareth@valinux.com> + */ + +/* + * Created: Fri Mar 19 14:30:16 1999 by faith@valinux.com + * + * Copyright 1999, 2000 Precision Insight, Inc., Cedar Park, Texas. + * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California. + * 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, 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 + * VA LINUX SYSTEMS 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. + */ + +#include <linux/export.h> +#include <drm/drmP.h> +#include "drm_legacy.h" + +/** + * Initialize the DMA data. + * + * \param dev DRM device. + * \return zero on success or a negative value on failure. + * + * Allocate and initialize a drm_device_dma structure. + */ +int drm_legacy_dma_setup(struct drm_device *dev) +{ + int i; + + if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA) || + drm_core_check_feature(dev, DRIVER_MODESET)) { + return 0; + } + + dev->buf_use = 0; + atomic_set(&dev->buf_alloc, 0); + + dev->dma = kzalloc(sizeof(*dev->dma), GFP_KERNEL); + if (!dev->dma) + return -ENOMEM; + + for (i = 0; i <= DRM_MAX_ORDER; i++) + memset(&dev->dma->bufs[i], 0, sizeof(dev->dma->bufs[0])); + + return 0; +} + +/** + * Cleanup the DMA resources. + * + * \param dev DRM device. + * + * Free all pages associated with DMA buffers, the buffers and pages lists, and + * finally the drm_device::dma structure itself. + */ +void drm_legacy_dma_takedown(struct drm_device *dev) +{ + struct drm_device_dma *dma = dev->dma; + int i, j; + + if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA) || + drm_core_check_feature(dev, DRIVER_MODESET)) { + return; + } + + if (!dma) + return; + + /* Clear dma buffers */ + for (i = 0; i <= DRM_MAX_ORDER; i++) { + if (dma->bufs[i].seg_count) { + DRM_DEBUG("order %d: buf_count = %d," + " seg_count = %d\n", + i, + dma->bufs[i].buf_count, + dma->bufs[i].seg_count); + for (j = 0; j < dma->bufs[i].seg_count; j++) { + if (dma->bufs[i].seglist[j]) { + drm_pci_free(dev, dma->bufs[i].seglist[j]); + } + } + kfree(dma->bufs[i].seglist); + } + if (dma->bufs[i].buf_count) { + for (j = 0; j < dma->bufs[i].buf_count; j++) { + kfree(dma->bufs[i].buflist[j].dev_private); + } + kfree(dma->bufs[i].buflist); + } + } + + kfree(dma->buflist); + kfree(dma->pagelist); + kfree(dev->dma); + dev->dma = NULL; +} + +/** + * Free a buffer. + * + * \param dev DRM device. + * \param buf buffer to free. + * + * Resets the fields of \p buf. + */ +void drm_legacy_free_buffer(struct drm_device *dev, struct drm_buf * buf) +{ + if (!buf) + return; + + buf->waiting = 0; + buf->pending = 0; + buf->file_priv = NULL; + buf->used = 0; +} + +/** + * Reclaim the buffers. + * + * \param file_priv DRM file private. + * + * Frees each buffer associated with \p file_priv not already on the hardware. + */ +void drm_legacy_reclaim_buffers(struct drm_device *dev, + struct drm_file *file_priv) +{ + struct drm_device_dma *dma = dev->dma; + int i; + + if (!dma) + return; + for (i = 0; i < dma->buf_count; i++) { + if (dma->buflist[i]->file_priv == file_priv) { + switch (dma->buflist[i]->list) { + case DRM_LIST_NONE: + drm_legacy_free_buffer(dev, dma->buflist[i]); + break; + case DRM_LIST_WAIT: + dma->buflist[i]->list = DRM_LIST_RECLAIM; + break; + default: + /* Buffer already on hardware. */ + break; + } + } + } +} |