libkms: Add intel backend

1 files changed, 256 insertions, 0 deletions

diff --git a/libkms/intel.c b/libkms/intel.c
new file mode 100644
index 00000000..6dd739d5
--- /dev/null
+++ b/libkms/intel.c
@@ -0,0 +1,256 @@
+/**************************************************************************
+ *
+ * Copyright © 2009 VMware, Inc., Palo Alto, CA., 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 COPYRIGHT HOLDERS, AUTHORS 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.
+ *
+ **************************************************************************/
+
+
+#define HAVE_STDINT_H
+#define _FILE_OFFSET_BITS 64
+
+#include <errno.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include "internal.h"
+
+#include <sys/mman.h>
+#include <sys/ioctl.h>
+#include "xf86drm.h"
+
+#include "i915_drm.h"
+
+struct intel_bo
+{
+	struct kms_bo base;
+	unsigned handle;
+	unsigned map_count;
+	int mapped;
+};
+
+static int
+intel_get_prop(struct kms_driver *kms, unsigned key, unsigned *out)
+{
+	switch (key) {
+	case KMS_MAX_SCANOUT_WIDTH:
+		*out = 4096;
+		break;
+	case KMS_MAX_SCANOUT_HEIGHT:
+		*out = 4096;
+		break;
+	case KMS_MIN_SCANOUT_WIDTH:
+		*out = 1;
+		break;
+	case KMS_MIN_SCANOUT_HEIGHT:
+		*out = 1;
+		break;
+	case KMS_MAX_CURSOR_WIDTH:
+		*out = 64;
+		break;
+	case KMS_MAX_CURSOR_HEIGHT:
+		*out = 64;
+		break;
+	case KMS_MIN_CURSOR_WIDTH:
+		*out = 64;
+		break;
+	case KMS_MIN_CURSOR_HEIGHT:
+		*out = 64;
+		break;
+	default:
+		return -EINVAL;
+	}
+	return 0;
+}
+
+static int
+intel_destroy(struct kms_driver *kms)
+{
+	free(kms);
+	return 0;
+}
+
+static int
+intel_bo_create(struct kms_driver *kms,
+		 const unsigned width, const unsigned height,
+		 const enum kms_bo_type type, const unsigned *attr,
+		 struct kms_bo **out)
+{
+	struct drm_i915_gem_create arg;
+	unsigned size, pitch;
+	struct intel_bo *bo;
+	int i, ret;
+
+	for (i = 0; attr[i]; i += 2) {
+		switch (attr[i]) {
+		case KMS_WIDTH:
+		case KMS_HEIGHT:
+		case KMS_BO_TYPE:
+			break;
+		default:
+			return -EINVAL;
+		}
+	}
+
+	bo = calloc(1, sizeof(*bo));
+	if (!bo)
+		return -ENOMEM;
+
+	if (type == KMS_BO_TYPE_CURSOR) {
+		pitch = 64 * 4;
+		size = 64 * 64 * 4;
+	} else if (type == KMS_BO_TYPE_SCANOUT) {
+		pitch = width * 4;
+		pitch = (pitch + 512 - 1) & ~(512 - 1);
+		size = pitch * ((height + 4 - 1) & ~(4 - 1));
+	} else {
+		return -EINVAL;
+	}
+
+	memset(&arg, 0, sizeof(arg));
+	arg.size = size;
+
+	ret = drmCommandWriteRead(kms->fd, DRM_I915_GEM_CREATE, &arg, sizeof(arg));
+	if (ret)
+		goto err_free;
+
+	bo->base.kms = kms;
+	bo->base.handle = arg.handle;
+	bo->base.size = size;
+	bo->base.pitch = pitch;
+
+	*out = &bo->base;
+	if (type == KMS_BO_TYPE_SCANOUT && pitch > 512) {
+		struct drm_i915_gem_set_tiling tile;
+
+		memset(&tile, 0, sizeof(tile));
+		tile.handle = bo->base.handle;
+		tile.tiling_mode = I915_TILING_X;
+		tile.stride = bo->base.pitch;
+
+		ret = drmCommandWriteRead(kms->fd, DRM_I915_GEM_SET_TILING, &tile, sizeof(tile));
+		if (ret != 0)
+			goto err_destroy;
+	}
+
+	return 0;
+
+err_destroy:
+	kms_bo_destroy(out);
+err_free:
+	free(bo);
+	return ret;
+}
+
+static int
+intel_bo_get_prop(struct kms_bo *bo, unsigned key, unsigned *out)
+{
+	switch (key) {
+	default:
+		return -EINVAL;
+	}
+}
+
+static int
+intel_bo_map(struct kms_bo *_bo, void **out)
+{
+	struct intel_bo *bo = (struct intel_bo *)_bo;
+	struct drm_i915_gem_mmap_gtt arg;
+	void *map = NULL;
+	int ret;
+
+	if (bo->base.ptr) {
+		bo->map_count++;
+		*out = bo->base.ptr;
+		return 0;
+	}
+
+	memset(&arg, 0, sizeof(arg));
+	arg.handle = bo->base.handle;
+
+	ret = drmCommandWriteRead(bo->base.kms->fd, DRM_I915_GEM_MMAP_GTT, &arg, sizeof(arg));
+	if (ret)
+		return ret;
+
+	map = mmap(0, bo->base.size, PROT_READ | PROT_WRITE, MAP_SHARED, bo->base.kms->fd, arg.offset);
+	if (map == MAP_FAILED)
+		return -errno;
+
+	bo->base.ptr = map;
+	bo->map_count++;
+	*out = bo->base.ptr;
+
+	return 0;
+}
+
+static int
+intel_bo_unmap(struct kms_bo *_bo)
+{
+	struct intel_bo *bo = (struct intel_bo *)_bo;
+	bo->map_count--;
+	return 0;
+}
+
+static int
+intel_bo_destroy(struct kms_bo *_bo)
+{
+	struct intel_bo *bo = (struct intel_bo *)_bo;
+	struct drm_gem_close arg;
+	int ret;
+
+	if (bo->base.ptr)
+		munmap(bo->base.ptr, bo->base.size);
+
+	memset(&arg, 0, sizeof(arg));
+	arg.handle = bo->base.handle;
+
+	ret = drmIoctl(bo->base.kms->fd, DRM_IOCTL_GEM_CLOSE, &arg);
+	if (ret)
+		return -errno;
+
+	free(bo);
+	return 0;
+}
+
+int
+intel_create(int fd, struct kms_driver **out)
+{
+	struct kms_driver *kms;
+
+	kms = calloc(1, sizeof(*kms));
+	if (!kms)
+		return -ENOMEM;
+
+	kms->fd = fd;
+
+	kms->bo_create = intel_bo_create;
+	kms->bo_map = intel_bo_map;
+	kms->bo_unmap = intel_bo_unmap;
+	kms->bo_get_prop = intel_bo_get_prop;
+	kms->bo_destroy = intel_bo_destroy;
+	kms->get_prop = intel_get_prop;
+	kms->destroy = intel_destroy;
+	*out = kms;
+
+	return 0;
+}