libkms: add dumb support

this uses the drm cap interface to check if the dumb ioctl
is supported.

4 files changed, 226 insertions, 0 deletions

diff --git a/libkms/Makefile.am b/libkms/Makefile.am
index 5c2e63fc..fa379a4b 100644
--- a/libkms/Makefile.am
+++ b/libkms/Makefile.am
@@ -16,6 +16,7 @@ libkms_la_SOURCES = \
 	internal.h \
 	linux.c \
 	intel.c \
+	dumb.c \
 	api.c
 
 if HAVE_VMWGFX
diff --git a/libkms/dumb.c b/libkms/dumb.c
new file mode 100644
index 00000000..3be5f7a2
--- /dev/null
+++ b/libkms/dumb.c
@@ -0,0 +1,220 @@
+/**************************************************************************
+ *
+ * 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 dumb_bo
+{
+	struct kms_bo base;
+	unsigned map_count;
+};
+
+static int
+dumb_get_prop(struct kms_driver *kms, unsigned key, unsigned *out)
+{
+	switch (key) {
+	case KMS_BO_TYPE:
+		*out = KMS_BO_TYPE_SCANOUT_X8R8G8B8 | KMS_BO_TYPE_CURSOR_64X64_A8R8G8B8;
+		break;
+	default:
+		return -EINVAL;
+	}
+	return 0;
+}
+
+static int
+dumb_destroy(struct kms_driver *kms)
+{
+	free(kms);
+	return 0;
+}
+
+static int
+dumb_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_mode_create_dumb arg;
+	struct dumb_bo *bo;
+	int i, ret;
+
+	for (i = 0; attr[i]; i += 2) {
+		switch (attr[i]) {
+		case KMS_WIDTH:
+		case KMS_HEIGHT:
+			break;
+		case KMS_BO_TYPE:
+			break;
+		default:
+			return -EINVAL;
+		}
+	}
+
+	bo = calloc(1, sizeof(*bo));
+	if (!bo)
+		return -ENOMEM;
+
+	memset(&arg, 0, sizeof(arg));
+
+	arg.bpp = 16;
+	arg.width = width;
+	arg.height = height;
+
+	ret = drmIoctl(kms->fd, DRM_IOCTL_MODE_CREATE_DUMB, &arg);
+	if (ret)
+		goto err_free;
+
+	bo->base.kms = kms;
+	bo->base.handle = arg.handle;
+	bo->base.size = arg.size;
+	bo->base.pitch = arg.pitch;
+
+	*out = &bo->base;
+
+	return 0;
+
+err_free:
+	free(bo);
+	return ret;
+}
+
+static int
+dumb_bo_get_prop(struct kms_bo *bo, unsigned key, unsigned *out)
+{
+	switch (key) {
+	default:
+		return -EINVAL;
+	}
+}
+
+static int
+dumb_bo_map(struct kms_bo *_bo, void **out)
+{
+	struct dumb_bo *bo = (struct dumb_bo *)_bo;
+	struct drm_mode_map_dumb 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 = drmIoctl(bo->base.kms->fd, DRM_IOCTL_MODE_MAP_DUMB, &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
+dumb_bo_unmap(struct kms_bo *_bo)
+{
+	struct dumb_bo *bo = (struct dumb_bo *)_bo;
+	bo->map_count--;
+	return 0;
+}
+
+static int
+dumb_bo_destroy(struct kms_bo *_bo)
+{
+	struct dumb_bo *bo = (struct dumb_bo *)_bo;
+	struct drm_mode_destroy_dumb arg;
+	int ret;
+
+	if (bo->base.ptr) {
+		/* XXX Sanity check map_count */
+		munmap(bo->base.ptr, bo->base.size);
+		bo->base.ptr = NULL;
+	}
+
+	memset(&arg, 0, sizeof(arg));
+	arg.handle = bo->base.handle;
+
+	ret = drmIoctl(bo->base.kms->fd, DRM_IOCTL_MODE_DESTROY_DUMB, &arg);
+	if (ret)
+		return -errno;
+
+	free(bo);
+	return 0;
+}
+
+int
+dumb_create(int fd, struct kms_driver **out)
+{
+	struct kms_driver *kms;
+	int ret;
+	uint64_t cap = 0;
+
+	ret = drmGetCap(fd, DRM_CAP_DUMB_BUFFER, &cap);
+	if (ret || cap == 0)
+		return -EINVAL;
+
+	kms = calloc(1, sizeof(*kms));
+	if (!kms)
+		return -ENOMEM;
+
+	kms->fd = fd;
+
+	kms->bo_create = dumb_bo_create;
+	kms->bo_map = dumb_bo_map;
+	kms->bo_unmap = dumb_bo_unmap;
+	kms->bo_get_prop = dumb_bo_get_prop;
+	kms->bo_destroy = dumb_bo_destroy;
+	kms->get_prop = dumb_get_prop;
+	kms->destroy = dumb_destroy;
+	*out = kms;
+
+	return 0;
+}
diff --git a/libkms/internal.h b/libkms/internal.h
index 51f5e65c..5e2501e4 100644
--- a/libkms/internal.h
+++ b/libkms/internal.h
@@ -68,6 +68,8 @@ int vmwgfx_create(int fd, struct kms_driver **out);
 
 int intel_create(int fd, struct kms_driver **out);
 
+int dumb_create(int fd, struct kms_driver **out);
+
 int nouveau_create(int fd, struct kms_driver **out);
 
 int radeon_create(int fd, struct kms_driver **out);
diff --git a/libkms/linux.c b/libkms/linux.c
index 7449abc1..fc4f205c 100644
--- a/libkms/linux.c
+++ b/libkms/linux.c
@@ -216,6 +216,9 @@ linux_from_udev(int fd, struct kms_driver **out)
 int
 linux_create(int fd, struct kms_driver **out)
 {
+	if (!dumb_create(fd, out))
+		return 0;
+
 	if (!linux_from_udev(fd, out))
 		return 0;