freedreno: add freedreno DRM

The libdrm_freedreno helper layer for use by xf86-video-freedreno,
fdre (freedreno r/e library and tests for driving gpu), and eventual
gallium driver for the Adreno GPU.  This uses the msm gpu driver
from QCOM's android kernel tree.

Note that current msm kernel driver is a bit strange.  It provides a
DRM interface for GEM, which is basically sufficient to have DRI2
working.  But it does not provide KMS.  And interface to 2d and 3d
cores is via different other devices (/dev/kgsl-*).  This is not
quite how I'd write a DRM driver, but at this stage it is useful for
xf86-video-freedreno and fdre (and eventual gallium driver) to be
able to work on existing kernel driver from QCOM, to allow to
capture cmdstream dumps from the binary blob drivers without having
to reboot.  So libdrm_freedreno attempts to hide most of the crazy.
The intention is that when there is a proper kernel driver, it will
be mostly just changes in libdrm_freedreno to adapt the gallium
driver and xf86-video-freedreno (ignoring the fbdev->KMS changes).

So don't look at freedreno as an example of how to write a libdrm
module or a DRM driver.. it is just an attempt to paper over a non-
standard kernel driver architecture.

v1: original
v2: hold ref's to pending bo's (because qcom's kernel driver doesn't),
    various bug fixes, add ringbuffer markers so we can emit IB's to
    portion of ringbuffer (so that gallium driver can use a single
    ringbuffer for both tile cmds and draw cmds.

Signed-off-by: Rob Clark <robclark@freedesktop.org>

1 files changed, 274 insertions, 0 deletions

diff --git a/freedreno/freedreno_bo.c b/freedreno/freedreno_bo.c
new file mode 100644
index 00000000..4f566e10
--- /dev/null
+++ b/freedreno/freedreno_bo.c
@@ -0,0 +1,274 @@
+/* -*- mode: C; c-file-style: "k&r"; tab-width 4; indent-tabs-mode: t; -*- */
+
+/*
+ * Copyright (C) 2012 Rob Clark <robclark@freedesktop.org>
+ *
+ * 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
+ * THE AUTHORS OR COPYRIGHT HOLDERS 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:
+ *    Rob Clark <robclark@freedesktop.org>
+ */
+
+#include "freedreno_drmif.h"
+#include "freedreno_priv.h"
+
+#include <linux/fb.h>
+
+static struct fd_bo * bo_from_handle(struct fd_device *dev,
+		uint32_t size, uint32_t handle)
+{
+	unsigned i;
+	struct fd_bo *bo = calloc(1, sizeof(*bo));
+	if (!bo)
+		return NULL;
+	bo->dev = dev;
+	bo->size = size;
+	bo->handle = handle;
+	atomic_set(&bo->refcnt, 1);
+	for (i = 0; i < ARRAY_SIZE(bo->list); i++)
+		list_inithead(&bo->list[i]);
+	return bo;
+}
+
+static int set_memtype(struct fd_bo *bo, uint32_t flags)
+{
+	struct drm_kgsl_gem_memtype req = {
+			.handle = bo->handle,
+			.type = flags & DRM_FREEDRENO_GEM_TYPE_MEM_MASK,
+	};
+
+	return drmCommandWrite(bo->dev->fd, DRM_KGSL_GEM_SETMEMTYPE,
+			&req, sizeof(req));
+}
+
+static int bo_alloc(struct fd_bo *bo)
+{
+	if (!bo->offset) {
+		struct drm_kgsl_gem_alloc req = {
+				.handle = bo->handle,
+		};
+		int ret;
+
+		/* if the buffer is already backed by pages then this
+		 * doesn't actually do anything (other than giving us
+		 * the offset)
+		 */
+		ret = drmCommandWriteRead(bo->dev->fd, DRM_KGSL_GEM_ALLOC,
+				&req, sizeof(req));
+		if (ret) {
+			ERROR_MSG("alloc failed: %s", strerror(errno));
+			return ret;
+		}
+
+		bo->offset = req.offset;
+	}
+	return 0;
+}
+
+struct fd_bo * fd_bo_new(struct fd_device *dev,
+		uint32_t size, uint32_t flags)
+{
+	struct drm_kgsl_gem_create req = {
+			.size = ALIGN(size, 4096),
+	};
+	struct fd_bo *bo = NULL;
+
+	if (drmCommandWriteRead(dev->fd, DRM_KGSL_GEM_CREATE,
+			&req, sizeof(req))) {
+		return NULL;
+	}
+
+	bo = bo_from_handle(dev, size, req.handle);
+	if (!bo) {
+		goto fail;
+	}
+
+	if (set_memtype(bo, flags)) {
+		goto fail;
+	}
+
+	return bo;
+fail:
+	if (bo)
+		fd_bo_del(bo);
+	return NULL;
+}
+
+/* don't use this... it is just needed to get a bo from the
+ * framebuffer (pre-dmabuf)
+ */
+struct fd_bo * fd_bo_from_fbdev(struct fd_pipe *pipe,
+		int fbfd, uint32_t size)
+{
+	struct drm_kgsl_gem_create_fd req = {
+			.fd = fbfd,
+	};
+	struct fd_bo *bo;
+
+	if (drmCommandWriteRead(pipe->dev->fd, DRM_KGSL_GEM_CREATE_FD,
+			&req, sizeof(req))) {
+		return NULL;
+	}
+
+	bo = bo_from_handle(pipe->dev, size, req.handle);
+
+	/* this is fugly, but works around a bug in the kernel..
+	 * priv->memdesc.size never gets set, so getbufinfo ioctl
+	 * thinks the buffer hasn't be allocate and fails
+	 */
+	if (bo && !fd_bo_gpuaddr(bo, 0)) {
+		void *fbmem = mmap(NULL, size, PROT_READ | PROT_WRITE,
+				MAP_SHARED, fbfd, 0);
+		struct kgsl_map_user_mem req = {
+				.memtype = KGSL_USER_MEM_TYPE_ADDR,
+				.len     = size,
+				.offset  = 0,
+				.hostptr = (unsigned long)fbmem,
+		};
+		int ret;
+		ret = ioctl(pipe->fd, IOCTL_KGSL_MAP_USER_MEM, &req);
+		if (ret) {
+			ERROR_MSG("mapping user mem failed: %s",
+					strerror(errno));
+			goto fail;
+		}
+		bo->gpuaddr = req.gpuaddr;
+		bo->map = fbmem;
+	}
+
+	return bo;
+fail:
+	if (bo)
+		fd_bo_del(bo);
+	return NULL;
+}
+
+struct fd_bo * fd_bo_from_name(struct fd_device *dev, uint32_t name)
+{
+	struct drm_gem_open req = {
+			.name = name,
+	};
+
+	if (drmIoctl(dev->fd, DRM_IOCTL_GEM_OPEN, &req)) {
+		return NULL;
+	}
+
+	return bo_from_handle(dev, req.size, req.handle);
+}
+
+struct fd_bo * fd_bo_ref(struct fd_bo *bo)
+{
+	atomic_inc(&bo->refcnt);
+	return bo;
+}
+
+void fd_bo_del(struct fd_bo *bo)
+{
+	if (!atomic_dec_and_test(&bo->refcnt))
+		return;
+
+	if (bo->map)
+		munmap(bo->map, bo->size);
+
+	if (bo->handle) {
+		struct drm_gem_close req = {
+				.handle = bo->handle,
+		};
+		drmIoctl(bo->dev->fd, DRM_IOCTL_GEM_CLOSE, &req);
+	}
+
+	free(bo);
+}
+
+int fd_bo_get_name(struct fd_bo *bo, uint32_t *name)
+{
+	if (!bo->name) {
+		struct drm_gem_flink req = {
+				.handle = bo->handle,
+		};
+		int ret;
+
+		ret = drmIoctl(bo->dev->fd, DRM_IOCTL_GEM_FLINK, &req);
+		if (ret) {
+			return ret;
+		}
+
+		bo->name = req.name;
+	}
+
+	*name = bo->name;
+
+	return 0;
+}
+
+uint32_t fd_bo_handle(struct fd_bo *bo)
+{
+	return bo->handle;
+}
+
+uint32_t fd_bo_size(struct fd_bo *bo)
+{
+	return bo->size;
+}
+
+void * fd_bo_map(struct fd_bo *bo)
+{
+	if (!bo->map) {
+		int ret;
+
+		ret = bo_alloc(bo);
+		if (ret) {
+			return NULL;
+		}
+
+		bo->map = mmap(0, bo->size, PROT_READ | PROT_WRITE, MAP_SHARED,
+				bo->dev->fd, bo->offset);
+		if (bo->map == MAP_FAILED) {
+			ERROR_MSG("mmap failed: %s", strerror(errno));
+			bo->map = NULL;
+		}
+	}
+	return bo->map;
+}
+
+uint32_t fd_bo_gpuaddr(struct fd_bo *bo, uint32_t offset)
+{
+	if (!bo->gpuaddr) {
+		struct drm_kgsl_gem_bufinfo req = {
+				.handle = bo->handle,
+		};
+		int ret;
+
+		ret = bo_alloc(bo);
+		if (ret) {
+			return ret;
+		}
+
+		ret = drmCommandWriteRead(bo->dev->fd, DRM_KGSL_GEM_GET_BUFINFO,
+				&req, sizeof(req));
+		if (ret) {
+			ERROR_MSG("get bufinfo failed: %s", strerror(errno));
+			return 0;
+		}
+
+		bo->gpuaddr = req.gpuaddr[0];
+	}
+	return bo->gpuaddr + offset;
+}