drm: Add GEM ("graphics execution manager") to i915 driver.

GEM allows the creation of persistent buffer objects accessible by the
graphics device through new ioctls for managing execution of commands on the
device.  The userland API is almost entirely driver-specific to ensure that
any driver building on this model can easily map the interface to individual
driver requirements.

GEM is used by the 2d driver for managing its internal state allocations and
will be used for pixmap storage to reduce memory consumption and enable
zero-copy GLX_EXT_texture_from_pixmap, and in the 3d driver is used to enable
GL_EXT_framebuffer_object and GL_ARB_pixel_buffer_object.

Signed-off-by: Eric Anholt <eric@anholt.net>
Signed-off-by: Dave Airlie <airlied@redhat.com>

1 files changed, 201 insertions, 0 deletions

diff --git a/drivers/gpu/drm/i915/i915_gem_debug.c b/drivers/gpu/drm/i915/i915_gem_debug.c
new file mode 100644
index 00000000000..131c088f8c8
--- /dev/null
+++ b/drivers/gpu/drm/i915/i915_gem_debug.c
@@ -0,0 +1,201 @@
+/*
+ * Copyright © 2008 Intel Corporation
+ *
+ * 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:
+ *    Keith Packard <keithp@keithp.com>
+ *
+ */
+
+#include "drmP.h"
+#include "drm.h"
+#include "i915_drm.h"
+#include "i915_drv.h"
+
+#if WATCH_INACTIVE
+void
+i915_verify_inactive(struct drm_device *dev, char *file, int line)
+{
+        drm_i915_private_t *dev_priv = dev->dev_private;
+        struct drm_gem_object *obj;
+        struct drm_i915_gem_object *obj_priv;
+
+        list_for_each_entry(obj_priv, &dev_priv->mm.inactive_list, list) {
+                obj = obj_priv->obj;
+                if (obj_priv->pin_count || obj_priv->active ||
+                    (obj->write_domain & ~(I915_GEM_DOMAIN_CPU |
+                                           I915_GEM_DOMAIN_GTT)))
+                        DRM_ERROR("inactive %p (p %d a %d w %x)  %s:%d\n",
+                                  obj,
+                                  obj_priv->pin_count, obj_priv->active,
+                                  obj->write_domain, file, line);
+        }
+}
+#endif /* WATCH_INACTIVE */
+
+
+#if WATCH_BUF | WATCH_EXEC | WATCH_PWRITE
+static void
+i915_gem_dump_page(struct page *page, uint32_t start, uint32_t end,
+                   uint32_t bias, uint32_t mark)
+{
+        uint32_t *mem = kmap_atomic(page, KM_USER0);
+        int i;
+        for (i = start; i < end; i += 4)
+                DRM_INFO("%08x: %08x%s\n",
+                          (int) (bias + i), mem[i / 4],
+                          (bias + i == mark) ? " ********" : "");
+        kunmap_atomic(mem, KM_USER0);
+        /* give syslog time to catch up */
+        msleep(1);
+}
+
+void
+i915_gem_dump_object(struct drm_gem_object *obj, int len,
+                     const char *where, uint32_t mark)
+{
+        struct drm_i915_gem_object *obj_priv = obj->driver_private;
+        int page;
+
+        DRM_INFO("%s: object at offset %08x\n", where, obj_priv->gtt_offset);
+        for (page = 0; page < (len + PAGE_SIZE-1) / PAGE_SIZE; page++) {
+                int page_len, chunk, chunk_len;
+
+                page_len = len - page * PAGE_SIZE;
+                if (page_len > PAGE_SIZE)
+                        page_len = PAGE_SIZE;
+
+                for (chunk = 0; chunk < page_len; chunk += 128) {
+                        chunk_len = page_len - chunk;
+                        if (chunk_len > 128)
+                                chunk_len = 128;
+                        i915_gem_dump_page(obj_priv->page_list[page],
+                                           chunk, chunk + chunk_len,
+                                           obj_priv->gtt_offset +
+                                           page * PAGE_SIZE,
+                                           mark);
+                }
+        }
+}
+#endif
+
+#if WATCH_LRU
+void
+i915_dump_lru(struct drm_device *dev, const char *where)
+{
+        drm_i915_private_t              *dev_priv = dev->dev_private;
+        struct drm_i915_gem_object      *obj_priv;
+
+        DRM_INFO("active list %s {\n", where);
+        list_for_each_entry(obj_priv, &dev_priv->mm.active_list,
+                            list)
+        {
+                DRM_INFO("    %p: %08x\n", obj_priv,
+                         obj_priv->last_rendering_seqno);
+        }
+        DRM_INFO("}\n");
+        DRM_INFO("flushing list %s {\n", where);
+        list_for_each_entry(obj_priv, &dev_priv->mm.flushing_list,
+                            list)
+        {
+                DRM_INFO("    %p: %08x\n", obj_priv,
+                         obj_priv->last_rendering_seqno);
+        }
+        DRM_INFO("}\n");
+        DRM_INFO("inactive %s {\n", where);
+        list_for_each_entry(obj_priv, &dev_priv->mm.inactive_list, list) {
+                DRM_INFO("    %p: %08x\n", obj_priv,
+                         obj_priv->last_rendering_seqno);
+        }
+        DRM_INFO("}\n");
+}
+#endif
+
+
+#if WATCH_COHERENCY
+void
+i915_gem_object_check_coherency(struct drm_gem_object *obj, int handle)
+{
+        struct drm_device *dev = obj->dev;
+        struct drm_i915_gem_object *obj_priv = obj->driver_private;
+        int page;
+        uint32_t *gtt_mapping;
+        uint32_t *backing_map = NULL;
+        int bad_count = 0;
+
+        DRM_INFO("%s: checking coherency of object %p@0x%08x (%d, %dkb):\n",
+                 __func__, obj, obj_priv->gtt_offset, handle,
+                 obj->size / 1024);
+
+        gtt_mapping = ioremap(dev->agp->base + obj_priv->gtt_offset,
+                              obj->size);
+        if (gtt_mapping == NULL) {
+                DRM_ERROR("failed to map GTT space\n");
+                return;
+        }
+
+        for (page = 0; page < obj->size / PAGE_SIZE; page++) {
+                int i;
+
+                backing_map = kmap_atomic(obj_priv->page_list[page], KM_USER0);
+
+                if (backing_map == NULL) {
+                        DRM_ERROR("failed to map backing page\n");
+                        goto out;
+                }
+
+                for (i = 0; i < PAGE_SIZE / 4; i++) {
+                        uint32_t cpuval = backing_map[i];
+                        uint32_t gttval = readl(gtt_mapping +
+                                                page * 1024 + i);
+
+                        if (cpuval != gttval) {
+                                DRM_INFO("incoherent CPU vs GPU at 0x%08x: "
+                                         "0x%08x vs 0x%08x\n",
+                                         (int)(obj_priv->gtt_offset +
+                                               page * PAGE_SIZE + i * 4),
+                                         cpuval, gttval);
+                                if (bad_count++ >= 8) {
+                                        DRM_INFO("...\n");
+                                        goto out;
+                                }
+                        }
+                }
+                kunmap_atomic(backing_map, KM_USER0);
+                backing_map = NULL;
+        }
+
+ out:
+        if (backing_map != NULL)
+                kunmap_atomic(backing_map, KM_USER0);
+        iounmap(gtt_mapping);
+
+        /* give syslog time to catch up */
+        msleep(1);
+
+        /* Directly flush the object, since we just loaded values with the CPU
+         * from the backing pages and we don't want to disturb the cache
+         * management that we're trying to observe.
+         */
+
+        i915_gem_clflush_object(obj);
+}
+#endif