[RFC 18/21] DRM: Add VIA drm driver

[James Simmons <jsimmons@infradead.org>]

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commit 589665935a7ec7c29103c9ea4eb1d0ffc4b918d5
Author: James Simmons <jsimmons@infradead.org>
Date:   Sat Jun 8 12:15:30 2013 -0400

    via: New GEM/TTM kms ioctls
    
    New ioctls to allow userland to allocate TTM/GEM buffer objects. Obsolete
    UMS ioctls.
    
    Signed-Off-by: James Simmons <jsimmons@infradead.org>

diff --git a/drivers/gpu/drm/via/via_ioc32.c b/drivers/gpu/drm/via/via_ioc32.c
new file mode 100644
index 0000000..03b8508
--- /dev/null
+++ b/drivers/gpu/drm/via/via_ioc32.c
@@ -0,0 +1,202 @@
+/*
+ * 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 AUTHORS OR COPYRIGHT HOLDERS AND/OR THEIR 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 "drmP.h"
+#include "via_drv.h"
+
+static int
+via_getparam(struct drm_device *dev, void *data,
+		struct drm_file *filp)
+{
+	struct drm_via_private *dev_priv = dev->dev_private;
+	struct drm_via_param *args = data;
+	int ret = 0;
+
+	switch (args->param) {
+	case VIA_PARAM_CHIPSET_ID:
+		args->value = dev->pci_device;
+		break;
+	case VIA_PARAM_REVISION_ID:
+		args->value = dev_priv->revision;
+		break;
+	default:
+		ret = -EINVAL;
+		break;
+	}
+	return ret;
+}
+
+/* Not yet supported */
+static int
+via_setparam(struct drm_device *dev, void *data,
+		struct drm_file *filp)
+{
+	return -EINVAL;
+}
+
+static int
+via_gem_alloc(struct drm_device *dev, void *data,
+		struct drm_file *filp)
+{
+	struct drm_via_private *dev_priv = dev->dev_private;
+	struct drm_via_gem_create *args = data;
+	struct drm_gem_object *obj;
+	int ret = -ENOMEM;
+
+	obj = ttm_gem_create(dev, &dev_priv->bdev, args->domains, false,
+				args->alignment, PAGE_SIZE, args->size);
+	if (obj && obj->driver_private) {
+		ret = drm_gem_handle_create(filp, obj, &args->handle);
+		/* drop reference from allocate - handle holds it now */
+		drm_gem_object_unreference_unlocked(obj);
+		if (!ret) {
+			struct ttm_buffer_object *bo = obj->driver_private;
+
+			args->domains = bo->mem.placement & TTM_PL_MASK_MEM;
+			args->map_handle = bo->addr_space_offset;
+			args->offset = bo->offset;
+			args->size = bo->mem.size;
+
+			obj->read_domains = obj->write_domain = args->domains;
+		}
+	}
+	return ret;
+}
+
+static int
+via_gem_state(struct drm_device *dev, void *data, struct drm_file *file_priv)
+{
+	struct ttm_buffer_object *bo = NULL;
+	struct drm_via_gem_create *args = data;
+	struct drm_gem_object *obj = NULL;
+	struct ttm_placement placement;
+	int ret = -EINVAL;
+
+	obj = drm_gem_object_lookup(dev, file_priv, args->handle);
+	if (!obj || !obj->driver_private)
+		return ret;
+
+	bo = obj->driver_private;
+
+	/* Don't bother to migrate to same domain */
+	args->domains &= ~(bo->mem.placement & TTM_PL_MASK_MEM);
+	if (args->domains) {
+		ret = ttm_bo_reserve(bo, true, false, false, 0);
+		if (unlikely(ret))
+			return ret;
+
+		ttm_placement_from_domain(bo, &placement, args->domains, bo->bdev);
+		ret = ttm_bo_validate(bo, &placement, false, false);
+		ttm_bo_unreserve(bo);
+
+		if (!ret) {
+			args->domains = bo->mem.placement & TTM_PL_MASK_MEM;
+			args->map_handle = bo->addr_space_offset;
+			args->offset = bo->offset;
+			args->size = bo->mem.size;
+
+			obj->read_domains = obj->write_domain = args->domains;
+		}
+	}
+	mutex_lock(&dev->struct_mutex);
+	drm_gem_object_unreference(obj);
+	mutex_unlock(&dev->struct_mutex);
+	return ret;
+}
+
+static int
+via_gem_wait(struct drm_device *dev, void *data, struct drm_file *file_priv)
+{
+	struct drm_via_gem_wait *args = data;
+	struct ttm_buffer_object *bo;
+	struct drm_gem_object *obj;
+	bool no_wait;
+	int ret;
+
+	obj = drm_gem_object_lookup(dev, file_priv, args->handle);
+	if (!obj)
+		return -EINVAL;
+
+	no_wait = (args->no_wait != 0);
+	bo = obj->driver_private;
+
+	ret = ttm_bo_reserve(bo, true, no_wait, false, 0);
+	if (unlikely(ret != 0))
+		return ret;
+
+	spin_lock(&bo->bdev->fence_lock);
+	if (bo->sync_obj)
+		ret = ttm_bo_wait(bo, true, true, no_wait);
+	ttm_bo_unreserve(bo);
+	spin_unlock(&bo->bdev->fence_lock);
+
+	mutex_lock(&dev->struct_mutex);
+	drm_gem_object_unreference(obj);
+	mutex_unlock(&dev->struct_mutex);
+	return ret;
+}
+
+#define KMS_INVALID_IOCTL(name)						\
+int name(struct drm_device *dev, void *data, struct drm_file *file_priv)\
+{									\
+	DRM_ERROR("invalid ioctl with kms %s\n", __func__);		\
+	return -EINVAL;							\
+}
+
+KMS_INVALID_IOCTL(via_mem_alloc)
+KMS_INVALID_IOCTL(via_mem_free)
+KMS_INVALID_IOCTL(via_agp_init)
+KMS_INVALID_IOCTL(via_fb_init)
+KMS_INVALID_IOCTL(via_map_init)
+KMS_INVALID_IOCTL(via_decoder_futex)
+KMS_INVALID_IOCTL(via_dma_blit)
+KMS_INVALID_IOCTL(via_dma_blit_sync)
+
+struct drm_ioctl_desc via_ioctls[] = {
+	DRM_IOCTL_DEF_DRV(VIA_ALLOCMEM, via_mem_alloc, DRM_AUTH),
+	DRM_IOCTL_DEF_DRV(VIA_FREEMEM, via_mem_free, DRM_AUTH),
+	DRM_IOCTL_DEF_DRV(VIA_AGP_INIT, via_agp_init, DRM_AUTH | DRM_MASTER),
+	DRM_IOCTL_DEF_DRV(VIA_FB_INIT, via_fb_init, DRM_AUTH | DRM_MASTER),
+	DRM_IOCTL_DEF_DRV(VIA_MAP_INIT, via_map_init, DRM_AUTH | DRM_MASTER),
+	DRM_IOCTL_DEF_DRV(VIA_DEC_FUTEX, via_decoder_futex, DRM_AUTH),
+	DRM_IOCTL_DEF_DRV(VIA_OLD_GEM_CREATE, via_gem_alloc, DRM_AUTH | DRM_UNLOCKED),
+	DRM_IOCTL_DEF_DRV(VIA_DMA_INIT, via_dma_init, DRM_AUTH),
+	DRM_IOCTL_DEF_DRV(VIA_CMDBUFFER, via_cmdbuffer, DRM_AUTH),
+	DRM_IOCTL_DEF_DRV(VIA_FLUSH, via_flush_ioctl, DRM_AUTH),
+	DRM_IOCTL_DEF_DRV(VIA_PCICMD, via_pci_cmdbuffer, DRM_AUTH),
+	DRM_IOCTL_DEF_DRV(VIA_CMDBUF_SIZE, via_cmdbuf_size, DRM_AUTH),
+	DRM_IOCTL_DEF_DRV(VIA_WAIT_IRQ, via_wait_irq, DRM_AUTH),
+	DRM_IOCTL_DEF_DRV(VIA_DMA_BLIT, via_dma_blit, DRM_AUTH),
+	DRM_IOCTL_DEF_DRV(VIA_BLIT_SYNC, via_dma_blit_sync, DRM_AUTH),
+	DRM_IOCTL_DEF_DRV(VIA_GETPARAM, via_getparam, DRM_AUTH | DRM_UNLOCKED),
+	DRM_IOCTL_DEF_DRV(VIA_SETPARAM, via_setparam, DRM_AUTH | DRM_MASTER | DRM_ROOT_ONLY),
+	DRM_IOCTL_DEF_DRV(VIA_GEM_CREATE, via_gem_alloc, DRM_AUTH | DRM_UNLOCKED),
+	DRM_IOCTL_DEF_DRV(VIA_GEM_WAIT, via_gem_wait, DRM_AUTH),
+	DRM_IOCTL_DEF_DRV(VIA_GEM_STATE, via_gem_state, DRM_AUTH),
+};
+
+int via_max_ioctl = DRM_ARRAY_SIZE(via_ioctls);

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