[PATCH 07/13 v4] drm/i915: GuC submission setup, phase 1

Dave Gordon
2015-07-09T18:29:51Z

From: Alex Dai <yu.dai@intel.com>

This adds the first of the data structures used to communicate with the
GuC (the pool of guc_context structures).

We create a GuC-specific wrapper round the GEM object allocator as all
GEM objects shared with the GuC must be pinned into GGTT space at an
address that is NOT in the range [0..WOPCM_SIZE), as that range of GGTT
addresses is not accessible to the GuC (from the GuC's point of view,
it's permanently reserved for other objects such as the BootROM & SRAM).

Later, we will need to allocate additional GuC-sharable objects for the
submission client(s) and the GuC's debug log.

v2:
Remove redundant initialisation [Chris Wilson]
Defer adding struct members until needed [Chris Wilson]
Local functions should pass dev_priv rather than dev [Chris Wilson]

v4:
Rebased

Issue: VIZ-4884
Signed-off-by: Alex Dai <yu.dai@intel.com>
Signed-off-by: Dave Gordon <david.s.gordon@intel.com>
---
drivers/gpu/drm/i915/Makefile | 3 +-
drivers/gpu/drm/i915/i915_guc_submission.c | 114 +++++++++++++++++++++++++++++
drivers/gpu/drm/i915/intel_guc.h | 7 ++
drivers/gpu/drm/i915/intel_guc_loader.c | 19 +++++
4 files changed, 142 insertions(+), 1 deletion(-)
create mode 100644 drivers/gpu/drm/i915/i915_guc_submission.c

diff --git a/drivers/gpu/drm/i915/Makefile b/drivers/gpu/drm/i915/Makefile
index e604cfe..23f5612 100644
--- a/drivers/gpu/drm/i915/Makefile
+++ b/drivers/gpu/drm/i915/Makefile
@@ -40,7 +40,8 @@ i915-y += i915_cmd_parser.o \
intel_uncore.o

# general-purpose microcontroller (GuC) support
-i915-y += intel_guc_loader.o
+i915-y += intel_guc_loader.o \
+ i915_guc_submission.o

# autogenerated null render state
i915-y += intel_renderstate_gen6.o \
diff --git a/drivers/gpu/drm/i915/i915_guc_submission.c b/drivers/gpu/drm/i915/i915_guc_submission.c
new file mode 100644
index 0000000..70a0405
--- /dev/null
+++ b/drivers/gpu/drm/i915/i915_guc_submission.c
@@ -0,0 +1,114 @@
+/*
+ * Copyright © 2014 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.
+ *
+ */
+#include <linux/firmware.h>
+#include <linux/circ_buf.h>
+#include "i915_drv.h"
+#include "intel_guc.h"
+
+/**
+ * gem_allocate_guc_obj() - Allocate gem object for GuC usage
+ * @dev: drm device
+ * @size: size of object
+ *
+ * This is a wrapper to create a gem obj. In order to use it inside GuC, the
+ * object needs to be pinned lifetime. Also we must pin it to gtt space other
+ * than [0, GUC_WOPCM_SIZE] because this range is reserved inside GuC.
+ *
+ * Return: A drm_i915_gem_object if successful, otherwise NULL.
+ */
+static struct drm_i915_gem_object *gem_allocate_guc_obj(struct drm_device *dev,
+ u32 size)
+{
+ struct drm_i915_gem_object *obj;
+
+ obj = i915_gem_alloc_object(dev, size);
+ if (!obj)
+ return NULL;
+
+ if (i915_gem_object_get_pages(obj)) {
+ drm_gem_object_unreference(&obj->base);
+ return NULL;
+ }
+
+ if (i915_gem_obj_ggtt_pin(obj, PAGE_SIZE,
+ PIN_OFFSET_BIAS | GUC_WOPCM_SIZE_VALUE)) {
+ drm_gem_object_unreference(&obj->base);
+ return NULL;
+ }
+
+ return obj;
+}
+
+/**
+ * gem_release_guc_obj() - Release gem object allocated for GuC usage
+ * @obj: gem obj to be released
+ */
+static void gem_release_guc_obj(struct drm_i915_gem_object *obj)
+{
+ if (!obj)
+ return;
+
+ if (i915_gem_obj_is_pinned(obj))
+ i915_gem_object_ggtt_unpin(obj);
+
+ drm_gem_object_unreference(&obj->base);
+}
+
+/*
+ * Set up the memory resources to be shared with the GuC. At this point,
+ * we require just one object that can be mapped through the GGTT.
+ */
+int i915_guc_submission_init(struct drm_device *dev)
+{
+ struct drm_i915_private *dev_priv = dev->dev_private;
+ const size_t ctxsize = sizeof(struct guc_context_desc);
+ const size_t poolsize = GUC_MAX_GPU_CONTEXTS * ctxsize;
+ const size_t gemsize = round_up(poolsize, PAGE_SIZE);
+ struct intel_guc *guc = &dev_priv->guc;
+
+ if (!i915.enable_guc_submission)
+ return 0; /* not enabled */
+
+ if (guc->ctx_pool_obj)
+ return 0; /* already allocated */
+
+ guc->ctx_pool_obj = gem_allocate_guc_obj(dev_priv->dev, gemsize);
+ if (!guc->ctx_pool_obj)
+ return -ENOMEM;
+
+ ida_init(&guc->ctx_ids);
+
+ return 0;
+}
+
+void i915_guc_submission_fini(struct drm_device *dev)
+{
+ struct drm_i915_private *dev_priv = dev->dev_private;
+ struct intel_guc *guc = &dev_priv->guc;
+
+ if (guc->ctx_pool_obj)
+ ida_destroy(&guc->ctx_ids);
+ gem_release_guc_obj(guc->ctx_pool_obj);
+ guc->ctx_pool_obj = NULL;
+}
diff --git a/drivers/gpu/drm/i915/intel_guc.h b/drivers/gpu/drm/i915/intel_guc.h
index 2846b6d..be3cad8 100644
--- a/drivers/gpu/drm/i915/intel_guc.h
+++ b/drivers/gpu/drm/i915/intel_guc.h
@@ -56,6 +56,9 @@ struct intel_guc {
struct intel_guc_fw guc_fw;

uint32_t log_flags;
+
+ struct drm_i915_gem_object *ctx_pool_obj;
+ struct ida ctx_ids;
};

/* intel_guc_loader.c */
@@ -64,4 +67,8 @@ extern int intel_guc_ucode_load(struct drm_device *dev);
extern void intel_guc_ucode_fini(struct drm_device *dev);
extern const char *intel_guc_fw_status_repr(enum intel_guc_fw_status status);

+/* i915_guc_submission.c */
+int i915_guc_submission_init(struct drm_device *dev);
+void i915_guc_submission_fini(struct drm_device *dev);
+
#endif
diff --git a/drivers/gpu/drm/i915/intel_guc_loader.c b/drivers/gpu/drm/i915/intel_guc_loader.c
index 2080bca..e5d7136 100644
--- a/drivers/gpu/drm/i915/intel_guc_loader.c
+++ b/drivers/gpu/drm/i915/intel_guc_loader.c
@@ -128,6 +128,21 @@ static void set_guc_init_params(struct drm_i915_private *dev_priv)
i915.guc_log_level << GUC_LOG_VERBOSITY_SHIFT;
}

+ /* If GuC scheduling is enabled, setup params here. */
+ if (i915.enable_guc_submission) {
+ u32 pgs = i915_gem_obj_ggtt_offset(dev_priv->guc.ctx_pool_obj);
+ u32 ctx_in_16 = GUC_MAX_GPU_CONTEXTS / 16;
+
+ pgs >>= PAGE_SHIFT;
+ params[GUC_CTL_CTXINFO] = (pgs << GUC_CTL_BASE_ADDR_SHIFT) |
+ (ctx_in_16 << GUC_CTL_CTXNUM_IN16_SHIFT);
+
+ params[GUC_CTL_FEATURE] |= GUC_CTL_KERNEL_SUBMISSIONS;
+
+ /* Unmask this bit to enable GuC scheduler */
+ params[GUC_CTL_FEATURE] &= ~GUC_CTL_DISABLE_SCHEDULER;
+ }
+
I915_WRITE(SOFT_SCRATCH(0), 0);

for (i = 0; i < GUC_CTL_MAX_DWORDS; i++)
@@ -450,6 +465,10 @@ int intel_guc_ucode_load(struct drm_device *dev)
break;
}

+ err = i915_guc_submission_init(dev);
+ if (err)
+ goto fail;
+
err = guc_ucode_xfer(dev_priv);
if (err)
goto fail;
--
1.9.1