nouveau: interface changes for 0.0.16 DRM

This commit encompasses the changes necessary to run on top of the 0.0.16
nouveau interface, additional APIs to support the new features of the
interface, as well as code from Luca Barbieri to improve the pushbuf
interface, which just happens to break nouveau's libdrm ABI so was delayed
until now.

API changes as a result of 0.0.16 DRM interface:

1. No more bo_pin()/bo_unpin(), these were only there for UMS and we no
   longer support it.

2. Any random nouveau_bo can be submitted to the GPU as a push buffer.

3. Relocations can be applied on any nouveau_bo

This patch changes the pushbuffer ABI to:

1. No longer use/expose nouveau_pushbuffer. Everything is directly
   in nouveau_channel. This saves the extra "pushbuf" pointer dereference.

2. Use cur/end pointers instead of tracking the remaining size.
   Pushing data now only needs to alter cur and not both cur and remaining.

The goal is to make the *_RING macros faster and make the interface simpler
and cleaner in the process.

The *_RING APIs are unchanged, but those are inlined and the ABI is changed.

Also, anything accessing pushbuf->remaining instead of using AVAIL_RING
will need to be fixed.

1 files changed, 132 insertions, 0 deletions

diff --git a/nouveau/nouveau_reloc.c b/nouveau/nouveau_reloc.c
new file mode 100644
index 00000000..301482b0
--- /dev/null
+++ b/nouveau/nouveau_reloc.c
@@ -0,0 +1,132 @@
+/*
+ * Copyright 2010 Nouveau Project
+ *
+ * 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 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 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.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <errno.h>
+#include <assert.h>
+
+#include "nouveau_private.h"
+
+static uint32_t
+nouveau_reloc_calc(struct drm_nouveau_gem_pushbuf_bo *pbbo,
+		   struct drm_nouveau_gem_pushbuf_reloc *r)
+{
+	uint32_t push = 0;
+
+	if (r->flags & NOUVEAU_GEM_RELOC_LOW)
+		push = (pbbo->presumed.offset + r->data);
+	else
+	if (r->flags & NOUVEAU_GEM_RELOC_HIGH)
+		push = (pbbo->presumed.offset + r->data) >> 32;
+	else
+		push = r->data;
+
+	if (r->flags & NOUVEAU_GEM_RELOC_OR) {
+		if (pbbo->presumed.domain & NOUVEAU_GEM_DOMAIN_VRAM)
+			push |= r->vor;
+		else
+			push |= r->tor;
+	}
+
+	return push;
+}
+
+int
+nouveau_reloc_emit(struct nouveau_channel *chan, struct nouveau_bo *reloc_bo,
+		   uint32_t reloc_offset, uint32_t *reloc_ptr,
+		   struct nouveau_bo *bo, uint32_t data, uint32_t data2,
+		   uint32_t flags, uint32_t vor, uint32_t tor)
+{
+	struct nouveau_pushbuf_priv *nvpb = &nouveau_channel(chan)->pb;
+	struct nouveau_bo_priv *nvbo = nouveau_bo(bo);
+	struct drm_nouveau_gem_pushbuf_reloc *r;
+	struct drm_nouveau_gem_pushbuf_bo *pbbo, *rpbbo;
+	uint32_t domains = 0;
+
+	if (nvpb->nr_relocs >= NOUVEAU_GEM_MAX_RELOCS) {
+		fprintf(stderr, "too many relocs!!\n");
+		return -ENOMEM;
+	}
+
+	if (nvbo->user && (flags & NOUVEAU_BO_WR)) {
+		fprintf(stderr, "write to user buffer!!\n");
+		return -EINVAL;
+	}
+
+	rpbbo = nouveau_bo_emit_buffer(chan, reloc_bo);
+	if (!rpbbo)
+		return -ENOMEM;
+	nouveau_bo(reloc_bo)->pending_refcnt++;
+
+	pbbo = nouveau_bo_emit_buffer(chan, bo);
+	if (!pbbo) {
+		fprintf(stderr, "buffer emit fail :(\n");
+		return -ENOMEM;
+	}
+	nouveau_bo(bo)->pending_refcnt++;
+
+	if (flags & NOUVEAU_BO_VRAM)
+		domains |= NOUVEAU_GEM_DOMAIN_VRAM;
+	if (flags & NOUVEAU_BO_GART)
+		domains |= NOUVEAU_GEM_DOMAIN_GART;
+
+	if (!(pbbo->valid_domains & domains)) {
+		fprintf(stderr, "no valid domains remain!\n");
+		return -EINVAL;
+	}
+	pbbo->valid_domains &= domains;
+
+	assert(flags & NOUVEAU_BO_RDWR);
+	if (flags & NOUVEAU_BO_RD) {
+		pbbo->read_domains |= domains;
+	}
+	if (flags & NOUVEAU_BO_WR) {
+		pbbo->write_domains |= domains;
+		nvbo->write_marker = 1;
+	}
+
+	r = nvpb->relocs + nvpb->nr_relocs++;
+	r->reloc_bo_index = rpbbo - nvpb->buffers;
+	r->reloc_bo_offset = reloc_offset;
+	r->bo_index = pbbo - nvpb->buffers;
+	r->flags = 0;
+	if (flags & NOUVEAU_BO_LOW)
+		r->flags |= NOUVEAU_GEM_RELOC_LOW;
+	if (flags & NOUVEAU_BO_HIGH)
+		r->flags |= NOUVEAU_GEM_RELOC_HIGH;
+	if (flags & NOUVEAU_BO_OR)
+		r->flags |= NOUVEAU_GEM_RELOC_OR;
+	r->data = data;
+	r->vor = vor;
+	r->tor = tor;
+
+	if (reloc_ptr) {
+		if (flags & NOUVEAU_BO_DUMMY)
+			*reloc_ptr = 0;
+		else
+			*reloc_ptr = nouveau_reloc_calc(pbbo, r);
+	}
+
+	return 0;
+}
+