aboutsummaryrefslogtreecommitdiffstats
path: root/src/gallium/drivers/iris/iris_batch.c
diff options
context:
space:
mode:
Diffstat (limited to 'src/gallium/drivers/iris/iris_batch.c')
-rw-r--r--src/gallium/drivers/iris/iris_batch.c620
1 files changed, 620 insertions, 0 deletions
diff --git a/src/gallium/drivers/iris/iris_batch.c b/src/gallium/drivers/iris/iris_batch.c
new file mode 100644
index 00000000000..e63584fe07b
--- /dev/null
+++ b/src/gallium/drivers/iris/iris_batch.c
@@ -0,0 +1,620 @@
+/*
+ * Copyright © 2017 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 VMWARE 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.
+ */
+
+#include "iris_batch.h"
+#include "iris_bufmgr.h"
+#include "iris_context.h"
+
+#include "drm-uapi/i915_drm.h"
+
+#include "util/hash_table.h"
+#include "main/macros.h"
+
+#include <errno.h>
+#include <xf86drm.h>
+
+#define FILE_DEBUG_FLAG DEBUG_BUFMGR
+
+/**
+ * Target sizes of the batch and state buffers. We create the initial
+ * buffers at these sizes, and flush when they're nearly full. If we
+ * underestimate how close we are to the end, and suddenly need more space
+ * in the middle of a draw, we can grow the buffers, and finish the draw.
+ * At that point, we'll be over our target size, so the next operation
+ * should flush. Each time we flush the batch, we recreate both buffers
+ * at the original target size, so it doesn't grow without bound.
+ */
+#define BATCH_SZ (20 * 1024)
+#define STATE_SZ (16 * 1024)
+
+/* The kernel assumes batchbuffers are smaller than 256kB. */
+#define MAX_BATCH_SIZE (256 * 1024)
+
+/* 3DSTATE_BINDING_TABLE_POINTERS has a U16 offset from Surface State Base
+ * Address, which means that we can't put binding tables beyond 64kB. This
+ * effectively limits the maximum statebuffer size to 64kB.
+ */
+#define MAX_STATE_SIZE (64 * 1024)
+
+static unsigned
+iris_batch_used(struct iris_batch *batch)
+{
+ return batch->cmd_map_next - batch->cmd_map;
+}
+
+static unsigned
+iris_state_used(struct iris_batch *batch)
+{
+ return batch->state_map_next - batch->state_map;
+}
+
+static void
+iris_batch_reset(struct iris_batch *batch);
+
+static bool
+uint_key_compare(const void *a, const void *b)
+{
+ return a == b;
+}
+
+static uint32_t
+uint_key_hash(const void *key)
+{
+ return (uintptr_t) key;
+}
+
+static void
+init_reloc_list(struct iris_reloc_list *rlist, int count)
+{
+ rlist->reloc_count = 0;
+ rlist->reloc_array_size = count;
+ rlist->relocs = malloc(rlist->reloc_array_size *
+ sizeof(struct drm_i915_gem_relocation_entry));
+}
+
+void
+iris_batch_init(struct iris_batch *batch,
+ struct iris_screen *screen,
+ struct pipe_debug_callback *dbg)
+{
+ batch->screen = screen;
+ batch->dbg = dbg;
+
+ init_reloc_list(&batch->batch_relocs, 256);
+ init_reloc_list(&batch->state_relocs, 256);
+
+ batch->exec_count = 0;
+ batch->exec_array_size = 100;
+ batch->exec_bos =
+ malloc(batch->exec_array_size * sizeof(batch->exec_bos[0]));
+ batch->validation_list =
+ malloc(batch->exec_array_size * sizeof(batch->validation_list[0]));
+
+ if (unlikely(INTEL_DEBUG)) {
+ batch->state_sizes =
+ _mesa_hash_table_create(NULL, uint_key_hash, uint_key_compare);
+ }
+
+ iris_batch_reset(batch);
+}
+
+#define READ_ONCE(x) (*(volatile __typeof__(x) *)&(x))
+
+static unsigned
+add_exec_bo(struct iris_batch *batch, struct iris_bo *bo)
+{
+ unsigned index = READ_ONCE(bo->index);
+
+ if (index < batch->exec_count && batch->exec_bos[index] == bo)
+ return index;
+
+ /* May have been shared between multiple active batches */
+ for (index = 0; index < batch->exec_count; index++) {
+ if (batch->exec_bos[index] == bo)
+ return index;
+ }
+
+ iris_bo_reference(bo);
+
+ if (batch->exec_count == batch->exec_array_size) {
+ batch->exec_array_size *= 2;
+ batch->exec_bos =
+ realloc(batch->exec_bos,
+ batch->exec_array_size * sizeof(batch->exec_bos[0]));
+ batch->validation_list =
+ realloc(batch->validation_list,
+ batch->exec_array_size * sizeof(batch->validation_list[0]));
+ }
+
+ batch->validation_list[batch->exec_count] =
+ (struct drm_i915_gem_exec_object2) {
+ .handle = bo->gem_handle,
+ .alignment = bo->align,
+ .offset = bo->gtt_offset,
+ .flags = bo->kflags,
+ };
+
+ bo->index = batch->exec_count;
+ batch->exec_bos[batch->exec_count] = bo;
+ batch->aperture_space += bo->size;
+
+ return batch->exec_count++;
+}
+
+static void
+iris_batch_reset(struct iris_batch *batch)
+{
+ struct iris_screen *screen = batch->screen;
+ struct iris_bufmgr *bufmgr = screen->bufmgr;
+
+ if (batch->last_cmd_bo != NULL) {
+ iris_bo_unreference(batch->last_cmd_bo);
+ batch->last_cmd_bo = NULL;
+ }
+ batch->last_cmd_bo = batch->cmd_bo;
+
+ batch->cmd_bo = iris_bo_alloc(bufmgr, "batchbuffer", BATCH_SZ, 4096);
+ batch->cmd_map = iris_bo_map(NULL, batch->cmd_bo, MAP_READ | MAP_WRITE);
+ batch->cmd_map_next = batch->cmd_map;
+
+ batch->state_bo = iris_bo_alloc(bufmgr, "statebuffer", STATE_SZ, 4096);
+ batch->state_bo->kflags = EXEC_OBJECT_CAPTURE;
+ batch->state_map =
+ iris_bo_map(NULL, batch->state_bo, MAP_READ | MAP_WRITE);
+
+ /* Avoid making 0 a valid state offset - otherwise the decoder will try
+ * and decode data when we use offset 0 as a null pointer.
+ */
+ batch->state_map_next = batch->state_map + 1;
+
+ add_exec_bo(batch, batch->cmd_bo);
+ assert(batch->cmd_bo->index == 0);
+
+ if (batch->state_sizes)
+ _mesa_hash_table_clear(batch->state_sizes, NULL);
+}
+
+static void
+iris_batch_reset_and_clear_render_cache(struct iris_batch *batch)
+{
+ iris_batch_reset(batch);
+ // XXX: iris_render_cache_set_clear(batch);
+}
+
+void
+iris_batch_free(struct iris_batch *batch)
+{
+ for (int i = 0; i < batch->exec_count; i++) {
+ iris_bo_unreference(batch->exec_bos[i]);
+ }
+ free(batch->batch_relocs.relocs);
+ free(batch->state_relocs.relocs);
+ free(batch->exec_bos);
+ free(batch->validation_list);
+
+ iris_bo_unreference(batch->cmd_bo);
+ iris_bo_unreference(batch->state_bo);
+ iris_bo_unreference(batch->last_cmd_bo);
+ if (batch->state_sizes)
+ _mesa_hash_table_destroy(batch->state_sizes, NULL);
+}
+
+/**
+ * Grow either the batch or state buffer to a new larger size.
+ *
+ * We can't actually grow buffers, so we allocate a new one, copy over
+ * the existing contents, and update our lists to refer to the new one.
+ *
+ * Note that this is only temporary - each new batch recreates the buffers
+ * at their original target size (BATCH_SZ or STATE_SZ).
+ */
+static void
+grow_buffer(struct iris_batch *batch,
+ struct iris_bo **bo_ptr,
+ void **map_ptr,
+ void **map_next_ptr,
+ unsigned new_size)
+{
+ struct iris_bufmgr *bufmgr = batch->screen->bufmgr;
+
+ const unsigned existing_bytes = *map_next_ptr - *map_ptr;
+
+ void *old_map = *map_ptr;
+ struct iris_bo *old_bo = *bo_ptr;
+
+ struct iris_bo *new_bo = iris_bo_alloc(bufmgr, old_bo->name, new_size, 4096);
+
+ perf_debug(batch->dbg, "Growing %s - ran out of space\n", old_bo->name);
+
+ void *new_map = iris_bo_map(NULL, new_bo, MAP_READ | MAP_WRITE);
+ memcpy(new_map, old_map, existing_bytes);
+
+ /* Try to put the new BO at the same GTT offset as the old BO (which
+ * we're throwing away, so it doesn't need to be there).
+ *
+ * This guarantees that our relocations continue to work: values we've
+ * already written into the buffer, values we're going to write into the
+ * buffer, and the validation/relocation lists all will match.
+ */
+ new_bo->gtt_offset = old_bo->gtt_offset;
+ new_bo->index = old_bo->index;
+
+ /* Batch/state buffers are per-context, and if we've run out of space,
+ * we must have actually used them before, so...they will be in the list.
+ */
+ assert(old_bo->index < batch->exec_count);
+ assert(batch->exec_bos[old_bo->index] == old_bo);
+
+ /* Update the validation list to use the new BO. */
+ batch->exec_bos[old_bo->index] = new_bo;
+ batch->validation_list[old_bo->index].handle = new_bo->gem_handle;
+ iris_bo_reference(new_bo);
+ iris_bo_unreference(old_bo);
+
+ /* Drop the *bo_ptr reference. This should free the old BO. */
+ iris_bo_unreference(old_bo);
+
+ *bo_ptr = new_bo;
+ *map_ptr = new_map;
+ *map_next_ptr = new_map + existing_bytes;
+}
+
+void
+iris_require_command_space(struct iris_batch *batch, unsigned size)
+{
+ if (iris_batch_used(batch) + size >= BATCH_SZ) {
+ if (!batch->no_wrap) {
+ iris_batch_flush(batch);
+ } else {
+ const unsigned new_size =
+ MIN2(batch->cmd_bo->size + batch->cmd_bo->size / 2,
+ MAX_BATCH_SIZE);
+ grow_buffer(batch, &batch->cmd_bo, &batch->cmd_map,
+ &batch->cmd_map_next, new_size);
+ assert(iris_batch_used(batch) + size < batch->cmd_bo->size);
+ }
+ }
+}
+
+void
+iris_batch_emit(struct iris_batch *batch, const void *data, unsigned size)
+{
+ iris_require_command_space(batch, size);
+ memcpy(batch->cmd_map_next, data, size);
+}
+
+/**
+ * Called when starting a new batch buffer.
+ */
+static void
+iris_new_batch(struct iris_batch *batch)
+{
+ /* Unreference any BOs held by the previous batch, and reset counts. */
+ for (int i = 0; i < batch->exec_count; i++) {
+ iris_bo_unreference(batch->exec_bos[i]);
+ batch->exec_bos[i] = NULL;
+ }
+ batch->batch_relocs.reloc_count = 0;
+ batch->state_relocs.reloc_count = 0;
+ batch->exec_count = 0;
+ batch->aperture_space = 0;
+
+ iris_bo_unreference(batch->state_bo);
+
+ /* Create a new batchbuffer and reset the associated state: */
+ iris_batch_reset_and_clear_render_cache(batch);
+}
+
+/**
+ * Called from iris_batch_flush before emitting MI_BATCHBUFFER_END and
+ * sending it off.
+ *
+ * This function can emit state (say, to preserve registers that aren't saved
+ * between batches).
+ */
+static void
+iris_finish_batch(struct iris_batch *batch)
+{
+ batch->no_wrap = true;
+
+ /* Mark the end of the buffer. */
+ const uint32_t MI_BATCH_BUFFER_END = (0xA << 23);
+ iris_batch_emit(batch, &MI_BATCH_BUFFER_END, sizeof(uint32_t));
+
+ batch->no_wrap = false;
+}
+
+static int
+submit_batch(struct iris_batch *batch, int in_fence_fd, int *out_fence_fd)
+{
+ iris_bo_unmap(batch->cmd_bo);
+ iris_bo_unmap(batch->state_bo);
+
+ /* The requirement for using I915_EXEC_NO_RELOC are:
+ *
+ * The addresses written in the objects must match the corresponding
+ * reloc.gtt_offset which in turn must match the corresponding
+ * execobject.offset.
+ *
+ * Any render targets written to in the batch must be flagged with
+ * EXEC_OBJECT_WRITE.
+ *
+ * To avoid stalling, execobject.offset should match the current
+ * address of that object within the active context.
+ */
+ int flags = I915_EXEC_NO_RELOC |
+ I915_EXEC_BATCH_FIRST |
+ I915_EXEC_HANDLE_LUT |
+ I915_EXEC_RENDER;
+
+ /* Set statebuffer relocations */
+ const unsigned state_index = batch->state_bo->index;
+ if (state_index < batch->exec_count &&
+ batch->exec_bos[state_index] == batch->state_bo) {
+ struct drm_i915_gem_exec_object2 *entry =
+ &batch->validation_list[state_index];
+ assert(entry->handle == batch->state_bo->gem_handle);
+ entry->relocation_count = batch->state_relocs.reloc_count;
+ entry->relocs_ptr = (uintptr_t) batch->state_relocs.relocs;
+ }
+
+ /* Set batchbuffer relocations */
+ struct drm_i915_gem_exec_object2 *entry = &batch->validation_list[0];
+ assert(entry->handle == batch->cmd_bo->gem_handle);
+ entry->relocation_count = batch->batch_relocs.reloc_count;
+ entry->relocs_ptr = (uintptr_t) batch->batch_relocs.relocs;
+
+ struct drm_i915_gem_execbuffer2 execbuf = {
+ .buffers_ptr = (uintptr_t) batch->validation_list,
+ .buffer_count = batch->exec_count,
+ .batch_start_offset = 0,
+ .batch_len = iris_batch_used(batch),
+ .flags = flags,
+ .rsvd1 = batch->hw_ctx_id, /* rsvd1 is actually the context ID */
+ };
+
+ unsigned long cmd = DRM_IOCTL_I915_GEM_EXECBUFFER2;
+
+ if (in_fence_fd != -1) {
+ execbuf.rsvd2 = in_fence_fd;
+ execbuf.flags |= I915_EXEC_FENCE_IN;
+ }
+
+ if (out_fence_fd != NULL) {
+ cmd = DRM_IOCTL_I915_GEM_EXECBUFFER2_WR;
+ *out_fence_fd = -1;
+ execbuf.flags |= I915_EXEC_FENCE_OUT;
+ }
+
+ int ret = drm_ioctl(batch->screen->fd, cmd, &execbuf);
+ if (ret != 0)
+ ret = -errno;
+
+ for (int i = 0; i < batch->exec_count; i++) {
+ struct iris_bo *bo = batch->exec_bos[i];
+
+ bo->idle = false;
+ bo->index = -1;
+
+ /* Update iris_bo::gtt_offset */
+ if (batch->validation_list[i].offset != bo->gtt_offset) {
+ DBG("BO %d migrated: 0x%" PRIx64 " -> 0x%llx\n",
+ bo->gem_handle, bo->gtt_offset,
+ batch->validation_list[i].offset);
+ bo->gtt_offset = batch->validation_list[i].offset;
+ }
+ }
+
+ if (ret == 0 && out_fence_fd != NULL)
+ *out_fence_fd = execbuf.rsvd2 >> 32;
+
+ return ret;
+}
+
+/**
+ * The in_fence_fd is ignored if -1. Otherwise this function takes ownership
+ * of the fd.
+ *
+ * The out_fence_fd is ignored if NULL. Otherwise, the caller takes ownership
+ * of the returned fd.
+ */
+int
+_iris_batch_flush_fence(struct iris_batch *batch,
+ int in_fence_fd, int *out_fence_fd,
+ const char *file, int line)
+{
+ if (iris_batch_used(batch) == 0)
+ return 0;
+
+ /* Check that we didn't just wrap our batchbuffer at a bad time. */
+ assert(!batch->no_wrap);
+
+ iris_finish_batch(batch);
+
+ if (unlikely(INTEL_DEBUG & (DEBUG_BATCH | DEBUG_SUBMIT))) {
+ int bytes_for_commands = iris_batch_used(batch);
+ int bytes_for_state = iris_state_used(batch);
+ fprintf(stderr, "%19s:%-3d: Batchbuffer flush with %5db (%0.1f%%) (pkt),"
+ " %5db (%0.1f%%) (state), %4d BOs (%0.1fMb aperture),"
+ " %4d batch relocs, %4d state relocs\n", file, line,
+ bytes_for_commands, 100.0f * bytes_for_commands / BATCH_SZ,
+ bytes_for_state, 100.0f * bytes_for_state / STATE_SZ,
+ batch->exec_count,
+ (float) batch->aperture_space / (1024 * 1024),
+ batch->batch_relocs.reloc_count,
+ batch->state_relocs.reloc_count);
+ }
+
+ int ret = submit_batch(batch, in_fence_fd, out_fence_fd);
+ if (ret < 0)
+ return ret;
+
+ //throttle(brw);
+
+ //if (unlikely(INTEL_DEBUG & DEBUG_BATCH))
+ //do_batch_dump(brw);
+
+ //if (brw->ctx.Const.ResetStrategy == GL_LOSE_CONTEXT_ON_RESET_ARB)
+ //iris_check_for_reset(ice);
+
+ if (unlikely(INTEL_DEBUG & DEBUG_SYNC)) {
+ dbg_printf("waiting for idle\n");
+ iris_bo_wait_rendering(batch->cmd_bo);
+ }
+
+ /* Start a new batch buffer. */
+ iris_new_batch(batch);
+
+ return 0;
+}
+
+bool
+iris_batch_references(struct iris_batch *batch, struct iris_bo *bo)
+{
+ unsigned index = READ_ONCE(bo->index);
+ if (index < batch->exec_count && batch->exec_bos[index] == bo)
+ return true;
+
+ for (int i = 0; i < batch->exec_count; i++) {
+ if (batch->exec_bos[i] == bo)
+ return true;
+ }
+ return false;
+}
+
+/* This is the only way buffers get added to the validate list.
+ */
+static uint64_t
+emit_reloc(struct iris_batch *batch,
+ struct iris_reloc_list *rlist, uint32_t offset,
+ struct iris_bo *target, uint32_t target_offset,
+ unsigned int reloc_flags)
+{
+ assert(target != NULL);
+
+ if (rlist->reloc_count == rlist->reloc_array_size) {
+ rlist->reloc_array_size *= 2;
+ rlist->relocs = realloc(rlist->relocs,
+ rlist->reloc_array_size *
+ sizeof(struct drm_i915_gem_relocation_entry));
+ }
+
+ unsigned int index = add_exec_bo(batch, target);
+ struct drm_i915_gem_exec_object2 *entry = &batch->validation_list[index];
+
+ rlist->relocs[rlist->reloc_count++] =
+ (struct drm_i915_gem_relocation_entry) {
+ .offset = offset,
+ .delta = target_offset,
+ .target_handle = index,
+ .presumed_offset = entry->offset,
+ };
+
+ /* Using the old buffer offset, write in what the right data would be, in
+ * case the buffer doesn't move and we can short-circuit the relocation
+ * processing in the kernel
+ */
+ return entry->offset + target_offset;
+}
+
+uint64_t
+iris_batch_reloc(struct iris_batch *batch, uint32_t batch_offset,
+ struct iris_bo *target, uint32_t target_offset,
+ unsigned int reloc_flags)
+{
+ assert(batch_offset <= batch->cmd_bo->size - sizeof(uint32_t));
+
+ return emit_reloc(batch, &batch->batch_relocs, batch_offset,
+ target, target_offset, reloc_flags);
+}
+
+uint64_t
+iris_state_reloc(struct iris_batch *batch, uint32_t state_offset,
+ struct iris_bo *target, uint32_t target_offset,
+ unsigned int reloc_flags)
+{
+ assert(state_offset <= batch->state_bo->size - sizeof(uint32_t));
+
+ return emit_reloc(batch, &batch->state_relocs, state_offset,
+ target, target_offset, reloc_flags);
+}
+
+
+static uint32_t
+iris_state_entry_size(struct iris_batch *batch, uint32_t offset)
+{
+ struct hash_entry *entry =
+ _mesa_hash_table_search(batch->state_sizes, (void *)(uintptr_t) offset);
+ return entry ? (uintptr_t) entry->data : 0;
+}
+
+/**
+ * Reserve some space in the statebuffer, or flush.
+ *
+ * This is used to estimate when we're near the end of the batch,
+ * so we can flush early.
+ */
+void
+iris_require_state_space(struct iris_batch *batch, unsigned size)
+{
+ if (iris_state_used(batch) + size >= STATE_SZ)
+ iris_batch_flush(batch);
+}
+
+/**
+ * Allocates a block of space in the batchbuffer for indirect state.
+ */
+void *
+iris_alloc_state(struct iris_batch *batch,
+ int size, int alignment,
+ uint32_t *out_offset)
+{
+ assert(size < batch->cmd_bo->size);
+
+ if (ALIGN(iris_state_used(batch), alignment) + size >= STATE_SZ) {
+ if (!batch->no_wrap) {
+ iris_batch_flush(batch);
+ } else {
+ const unsigned new_size =
+ MIN2(batch->state_bo->size + batch->state_bo->size / 2,
+ MAX_STATE_SIZE);
+ grow_buffer(batch, &batch->state_bo, &batch->state_map,
+ &batch->state_map_next, new_size);
+ }
+ }
+
+ unsigned offset = ALIGN(iris_state_used(batch), alignment);
+ assert(offset + size < batch->state_bo->size);
+
+ if (unlikely(batch->state_sizes)) {
+ _mesa_hash_table_insert(batch->state_sizes,
+ (void *) (uintptr_t) offset,
+ (void *) (uintptr_t) size);
+ }
+
+ batch->state_map_next = batch->state_map + offset + size;
+
+ *out_offset = offset;
+ return batch->state_map + offset;
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-01 18:44:42 +0000