Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / drivers / gpu / drm / drm_dma.c

diff --git a/kernel/drivers/gpu/drm/drm_dma.c b/kernel/drivers/gpu/drm/drm_dma.c
new file mode 100644 (file)
index 0000000..ea48180
--- /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;
+                       }
+               }
+       }
+}