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, 249 insertions, 0 deletions

diff --git a/freedreno/freedreno_ringbuffer.c b/freedreno/freedreno_ringbuffer.c
new file mode 100644
index 00000000..822412a9
--- /dev/null
+++ b/freedreno/freedreno_ringbuffer.c
@@ -0,0 +1,249 @@
+/* -*- 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 "freedreno_ringbuffer.h"
+
+
+/* because kgsl tries to validate the gpuaddr on kernel side in ISSUEIBCMDS,
+ * we can't use normal gem bo's for ringbuffer..  someday the kernel part
+ * needs to be reworked into a single sane drm driver :-/
+ */
+struct fd_rb_bo {
+	struct fd_pipe *pipe;
+	void    *hostptr;
+	uint32_t gpuaddr;
+	uint32_t size;
+};
+
+struct fd_ringmarker {
+	struct fd_ringbuffer *ring;
+	uint32_t *cur;
+};
+
+static void fd_rb_bo_del(struct fd_rb_bo *bo)
+{
+	struct kgsl_sharedmem_free req = {
+			.gpuaddr = bo->gpuaddr,
+	};
+	int ret;
+
+	munmap(bo->hostptr, bo->size);
+
+	ret = ioctl(bo->pipe->fd, IOCTL_KGSL_SHAREDMEM_FREE, &req);
+	if (ret) {
+		ERROR_MSG("sharedmem free failed: %s", strerror(errno));
+	}
+
+	free(bo);
+}
+
+static struct fd_rb_bo * fd_rb_bo_new(struct fd_pipe *pipe, uint32_t size)
+{
+	struct fd_rb_bo *bo;
+	struct kgsl_gpumem_alloc req = {
+			.size = ALIGN(size, 4096),
+			.flags = KGSL_MEMFLAGS_GPUREADONLY,
+	};
+	int ret;
+
+	bo = calloc(1, sizeof(*bo));
+	if (!bo) {
+		ERROR_MSG("allocation failed");
+		return NULL;
+	}
+	ret = ioctl(pipe->fd, IOCTL_KGSL_GPUMEM_ALLOC, &req);
+	if (ret) {
+		ERROR_MSG("gpumem allocation failed: %s", strerror(errno));
+		goto fail;
+	}
+
+	bo->pipe = pipe;
+	bo->gpuaddr = req.gpuaddr;
+	bo->size = size;
+	bo->hostptr = mmap(NULL, size, PROT_WRITE|PROT_READ,
+				MAP_SHARED, pipe->fd, req.gpuaddr);
+
+	return bo;
+fail:
+	if (bo)
+		fd_rb_bo_del(bo);
+	return NULL;
+}
+
+struct fd_ringbuffer * fd_ringbuffer_new(struct fd_pipe *pipe,
+		uint32_t size)
+{
+	struct fd_ringbuffer *ring = NULL;
+
+	ring = calloc(1, sizeof(*ring));
+	if (!ring) {
+		ERROR_MSG("allocation failed");
+		goto fail;
+	}
+
+	ring->bo = fd_rb_bo_new(pipe, size);
+	if (!ring->bo) {
+		ERROR_MSG("ringbuffer allocation failed");
+		goto fail;
+	}
+
+	ring->size = size;
+	ring->pipe = pipe;
+	ring->start = ring->bo->hostptr;
+	ring->end = &(ring->start[size/4]);
+
+	ring->cur = ring->last_start = ring->start;
+
+	return ring;
+fail:
+	if (ring)
+		fd_ringbuffer_del(ring);
+	return NULL;
+}
+
+void fd_ringbuffer_del(struct fd_ringbuffer *ring)
+{
+	if (ring->bo)
+		fd_rb_bo_del(ring->bo);
+	free(ring);
+}
+
+void fd_ringbuffer_reset(struct fd_ringbuffer *ring)
+{
+	uint32_t *start = ring->start;
+	if (ring->pipe->id == FD_PIPE_2D)
+		start = &ring->start[0x140];
+	ring->cur = ring->last_start = start;
+}
+
+static int flush_impl(struct fd_ringbuffer *ring, uint32_t *last_start)
+{
+	uint32_t offset = (uint8_t *)last_start - (uint8_t *)ring->start;
+	struct kgsl_ibdesc ibdesc = {
+			.gpuaddr     = ring->bo->gpuaddr + offset,
+			.hostptr     = last_start,
+			.sizedwords  = ring->cur - last_start,
+	};
+	struct kgsl_ringbuffer_issueibcmds req = {
+			.drawctxt_id = ring->pipe->drawctxt_id,
+			.ibdesc_addr = (unsigned long)&ibdesc,
+			.numibs      = 1,
+			.flags       = KGSL_CONTEXT_SUBMIT_IB_LIST,
+	};
+	int ret;
+
+	/* z180_cmdstream_issueibcmds() is made of fail: */
+	if (ring->pipe->id == FD_PIPE_2D) {
+		/* fix up size field in last cmd packet */
+		uint32_t last_size = (uint32_t)(ring->cur - last_start);
+		/* 5 is length of first packet, 2 for the two 7f000000's */
+		last_start[2] = last_size - (5 + 2);
+		ibdesc.gpuaddr = ring->bo->gpuaddr;
+		ibdesc.hostptr = ring->bo->hostptr;
+		ibdesc.sizedwords = 0x145;
+		req.timestamp = (uint32_t)ring->bo->hostptr;
+	}
+
+	do {
+		ret = ioctl(ring->pipe->fd, IOCTL_KGSL_RINGBUFFER_ISSUEIBCMDS, &req);
+	} while ((ret == -1) && ((errno == EINTR) || (errno == EAGAIN)));
+	if (ret)
+		ERROR_MSG("issueibcmds failed!  %d (%s)", ret, strerror(errno));
+
+	ring->last_timestamp = req.timestamp;
+	ring->last_start = ring->cur;
+
+	fd_pipe_process_submit(ring->pipe, req.timestamp);
+
+	return ret;
+}
+
+/* maybe get rid of this and use fd_ringmarker_flush() from DDX too? */
+int fd_ringbuffer_flush(struct fd_ringbuffer *ring)
+{
+	return flush_impl(ring, ring->last_start);
+}
+
+uint32_t fd_ringbuffer_timestamp(struct fd_ringbuffer *ring)
+{
+	return ring->last_timestamp;
+}
+
+void fd_ringbuffer_emit_reloc(struct fd_ringbuffer *ring,
+		struct fd_bo *bo, uint32_t offset, uint32_t or)
+{
+	(*ring->cur++) = fd_bo_gpuaddr(bo, offset) | or;
+	fd_pipe_add_submit(ring->pipe, bo);
+}
+
+void fd_ringbuffer_emit_reloc_ring(struct fd_ringbuffer *ring,
+		struct fd_ringmarker *target)
+{
+	(*ring->cur++) = target->ring->bo->gpuaddr +
+			(uint8_t *)target->cur - (uint8_t *)target->ring->start;
+}
+
+struct fd_ringmarker * fd_ringmarker_new(struct fd_ringbuffer *ring)
+{
+	struct fd_ringmarker *marker = NULL;
+
+	marker = calloc(1, sizeof(*marker));
+	if (!marker) {
+		ERROR_MSG("allocation failed");
+		return NULL;
+	}
+
+	marker->ring = ring;
+
+	fd_ringmarker_mark(marker);
+
+	return marker;
+}
+
+void fd_ringmarker_del(struct fd_ringmarker *marker)
+{
+	free(marker);
+}
+
+void fd_ringmarker_mark(struct fd_ringmarker *marker)
+{
+	marker->cur = marker->ring->cur;
+}
+
+uint32_t fd_ringmarker_dwords(struct fd_ringmarker *start,
+		struct fd_ringmarker *end)
+{
+	return end->cur - start->cur;
+}
+
+int fd_ringmarker_flush(struct fd_ringmarker *marker)
+{
+	return flush_impl(marker->ring, marker->cur);
+}