[PATCH 09/21] drm/i915: Allow userspace to specify ringsize on construction
Chris Wilson
chris at chris-wilson.co.uk
Thu Feb 13 12:26:51 UTC 2020
No good reason why we must always use a static ringsize, so let
userspace select one during construction.
Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
Cc: Joonas Lahtinen <joonas.lahtinen at linux.intel.com>
Cc: Steve Carbonari <steven.carbonari at intel.com>
Reviewed-by: Janusz Krzysztofik <janusz.krzysztofik at linux.intel.com>
---
drivers/gpu/drm/i915/Makefile | 1 +
drivers/gpu/drm/i915/gem/i915_gem_context.c | 110 ++++++++++++++++--
drivers/gpu/drm/i915/gt/intel_context_param.c | 63 ++++++++++
drivers/gpu/drm/i915/gt/intel_context_param.h | 14 +++
drivers/gpu/drm/i915/gt/intel_lrc.c | 1 +
include/uapi/drm/i915_drm.h | 21 ++++
6 files changed, 202 insertions(+), 8 deletions(-)
create mode 100644 drivers/gpu/drm/i915/gt/intel_context_param.c
create mode 100644 drivers/gpu/drm/i915/gt/intel_context_param.h
diff --git a/drivers/gpu/drm/i915/Makefile b/drivers/gpu/drm/i915/Makefile
index 4e84e033d7b1..6d5658f30cd3 100644
--- a/drivers/gpu/drm/i915/Makefile
+++ b/drivers/gpu/drm/i915/Makefile
@@ -82,6 +82,7 @@ gt-y += \
gt/gen8_ppgtt.o \
gt/intel_breadcrumbs.o \
gt/intel_context.o \
+ gt/intel_context_param.o \
gt/intel_context_sseu.o \
gt/intel_engine_cs.o \
gt/intel_engine_heartbeat.o \
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_context.c b/drivers/gpu/drm/i915/gem/i915_gem_context.c
index fd57b1f6f27e..fd4f1d4c36a1 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_context.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_context.c
@@ -71,6 +71,7 @@
#include "gt/gen6_ppgtt.h"
#include "gt/intel_context.h"
+#include "gt/intel_context_param.h"
#include "gt/intel_engine_heartbeat.h"
#include "gt/intel_engine_user.h"
#include "gt/intel_execlists_submission.h" /* virtual_engine */
@@ -669,23 +670,30 @@ __create_context(struct drm_i915_private *i915)
return ERR_PTR(err);
}
-static void
+static int
context_apply_all(struct i915_gem_context *ctx,
- void (*fn)(struct intel_context *ce, void *data),
+ int (*fn)(struct intel_context *ce, void *data),
void *data)
{
struct i915_gem_engines_iter it;
struct intel_context *ce;
+ int err = 0;
- for_each_gem_engine(ce, i915_gem_context_lock_engines(ctx), it)
- fn(ce, data);
+ for_each_gem_engine(ce, i915_gem_context_lock_engines(ctx), it) {
+ err = fn(ce, data);
+ if (err)
+ break;
+ }
i915_gem_context_unlock_engines(ctx);
+
+ return err;
}
-static void __apply_ppgtt(struct intel_context *ce, void *vm)
+static int __apply_ppgtt(struct intel_context *ce, void *vm)
{
i915_vm_put(ce->vm);
ce->vm = i915_vm_get(vm);
+ return 0;
}
static struct i915_address_space *
@@ -723,9 +731,10 @@ static void __set_timeline(struct intel_timeline **dst,
intel_timeline_put(old);
}
-static void __apply_timeline(struct intel_context *ce, void *timeline)
+static int __apply_timeline(struct intel_context *ce, void *timeline)
{
__set_timeline(&ce->timeline, timeline);
+ return 0;
}
static void __assign_timeline(struct i915_gem_context *ctx,
@@ -1216,6 +1225,63 @@ static int set_ppgtt(struct drm_i915_file_private *file_priv,
return err;
}
+static int __apply_ringsize(struct intel_context *ce, void *sz)
+{
+ return intel_context_set_ring_size(ce, (unsigned long)sz);
+}
+
+static int set_ringsize(struct i915_gem_context *ctx,
+ struct drm_i915_gem_context_param *args)
+{
+ if (!HAS_LOGICAL_RING_CONTEXTS(ctx->i915))
+ return -ENODEV;
+
+ if (args->size)
+ return -EINVAL;
+
+ if (!IS_ALIGNED(args->value, I915_GTT_PAGE_SIZE))
+ return -EINVAL;
+
+ if (args->value < I915_GTT_PAGE_SIZE)
+ return -EINVAL;
+
+ if (args->value > 128 * I915_GTT_PAGE_SIZE)
+ return -EINVAL;
+
+ return context_apply_all(ctx,
+ __apply_ringsize,
+ __intel_context_ring_size(args->value));
+}
+
+static int __get_ringsize(struct intel_context *ce, void *arg)
+{
+ long sz;
+
+ sz = intel_context_get_ring_size(ce);
+ GEM_BUG_ON(sz > INT_MAX);
+
+ return sz; /* stop on first engine */
+}
+
+static int get_ringsize(struct i915_gem_context *ctx,
+ struct drm_i915_gem_context_param *args)
+{
+ int sz;
+
+ if (!HAS_LOGICAL_RING_CONTEXTS(ctx->i915))
+ return -ENODEV;
+
+ if (args->size)
+ return -EINVAL;
+
+ sz = context_apply_all(ctx, __get_ringsize, NULL);
+ if (sz < 0)
+ return sz;
+
+ args->value = sz;
+ return 0;
+}
+
static int
user_to_context_sseu(struct drm_i915_private *i915,
const struct drm_i915_gem_context_param_sseu *user,
@@ -1853,17 +1919,19 @@ set_persistence(struct i915_gem_context *ctx,
return __context_set_persistence(ctx, args->value);
}
-static void __apply_priority(struct intel_context *ce, void *arg)
+static int __apply_priority(struct intel_context *ce, void *arg)
{
struct i915_gem_context *ctx = arg;
if (!intel_engine_has_semaphores(ce->engine))
- return;
+ return 0;
if (ctx->sched.priority >= I915_PRIORITY_NORMAL)
intel_context_set_use_semaphores(ce);
else
intel_context_clear_use_semaphores(ce);
+
+ return 0;
}
static int set_priority(struct i915_gem_context *ctx,
@@ -1956,6 +2024,10 @@ static int ctx_setparam(struct drm_i915_file_private *fpriv,
ret = set_persistence(ctx, args);
break;
+ case I915_CONTEXT_PARAM_RINGSIZE:
+ ret = set_ringsize(ctx, args);
+ break;
+
case I915_CONTEXT_PARAM_BAN_PERIOD:
default:
ret = -EINVAL;
@@ -1984,6 +2056,18 @@ static int create_setparam(struct i915_user_extension __user *ext, void *data)
return ctx_setparam(arg->fpriv, arg->ctx, &local.param);
}
+static int copy_ring_size(struct intel_context *dst,
+ struct intel_context *src)
+{
+ long sz;
+
+ sz = intel_context_get_ring_size(src);
+ if (sz < 0)
+ return sz;
+
+ return intel_context_set_ring_size(dst, sz);
+}
+
static int clone_engines(struct i915_gem_context *dst,
struct i915_gem_context *src)
{
@@ -2027,6 +2111,12 @@ static int clone_engines(struct i915_gem_context *dst,
}
intel_context_set_gem(clone->engines[n], dst);
+
+ /* Copy across the preferred ringsize */
+ if (copy_ring_size(clone->engines[n], e->engines[n])) {
+ __free_engines(clone, n + 1);
+ goto err_unlock;
+ }
}
clone->num_engines = n;
@@ -2389,6 +2479,10 @@ int i915_gem_context_getparam_ioctl(struct drm_device *dev, void *data,
args->value = i915_gem_context_is_persistent(ctx);
break;
+ case I915_CONTEXT_PARAM_RINGSIZE:
+ ret = get_ringsize(ctx, args);
+ break;
+
case I915_CONTEXT_PARAM_BAN_PERIOD:
default:
ret = -EINVAL;
diff --git a/drivers/gpu/drm/i915/gt/intel_context_param.c b/drivers/gpu/drm/i915/gt/intel_context_param.c
new file mode 100644
index 000000000000..65dcd090245d
--- /dev/null
+++ b/drivers/gpu/drm/i915/gt/intel_context_param.c
@@ -0,0 +1,63 @@
+// SPDX-License-Identifier: MIT
+/*
+ * Copyright © 2019 Intel Corporation
+ */
+
+#include "i915_active.h"
+#include "intel_context.h"
+#include "intel_context_param.h"
+#include "intel_ring.h"
+
+int intel_context_set_ring_size(struct intel_context *ce, long sz)
+{
+ int err;
+
+ if (intel_context_lock_pinned(ce))
+ return -EINTR;
+
+ err = i915_active_wait(&ce->active);
+ if (err < 0)
+ goto unlock;
+
+ if (intel_context_is_pinned(ce)) {
+ err = -EBUSY; /* In active use, come back later! */
+ goto unlock;
+ }
+
+ if (test_bit(CONTEXT_ALLOC_BIT, &ce->flags)) {
+ struct intel_ring *ring;
+
+ /* Replace the existing ringbuffer */
+ ring = intel_engine_create_ring(ce->engine, sz);
+ if (IS_ERR(ring)) {
+ err = PTR_ERR(ring);
+ goto unlock;
+ }
+
+ intel_ring_put(ce->ring);
+ ce->ring = ring;
+
+ /* Context image will be updated on next pin */
+ } else {
+ ce->ring = __intel_context_ring_size(sz);
+ }
+
+unlock:
+ intel_context_unlock_pinned(ce);
+ return err;
+}
+
+long intel_context_get_ring_size(struct intel_context *ce)
+{
+ long sz = (unsigned long)READ_ONCE(ce->ring);
+
+ if (test_bit(CONTEXT_ALLOC_BIT, &ce->flags)) {
+ if (intel_context_lock_pinned(ce))
+ return -EINTR;
+
+ sz = ce->ring->size;
+ intel_context_unlock_pinned(ce);
+ }
+
+ return sz;
+}
diff --git a/drivers/gpu/drm/i915/gt/intel_context_param.h b/drivers/gpu/drm/i915/gt/intel_context_param.h
new file mode 100644
index 000000000000..f053d8633fe2
--- /dev/null
+++ b/drivers/gpu/drm/i915/gt/intel_context_param.h
@@ -0,0 +1,14 @@
+/* SPDX-License-Identifier: MIT */
+/*
+ * Copyright © 2019 Intel Corporation
+ */
+
+#ifndef INTEL_CONTEXT_PARAM_H
+#define INTEL_CONTEXT_PARAM_H
+
+struct intel_context;
+
+int intel_context_set_ring_size(struct intel_context *ce, long sz);
+long intel_context_get_ring_size(struct intel_context *ce);
+
+#endif /* INTEL_CONTEXT_PARAM_H */
diff --git a/drivers/gpu/drm/i915/gt/intel_lrc.c b/drivers/gpu/drm/i915/gt/intel_lrc.c
index a1a35c9d251c..564ea0d0e321 100644
--- a/drivers/gpu/drm/i915/gt/intel_lrc.c
+++ b/drivers/gpu/drm/i915/gt/intel_lrc.c
@@ -746,6 +746,7 @@ void intel_lrc_update_reg_state(const struct intel_context *ce,
regs[CTX_RING_START] = i915_ggtt_offset(ring->vma);
regs[CTX_RING_HEAD] = head;
regs[CTX_RING_TAIL] = ring->tail;
+ regs[CTX_RING_CTL] = RING_CTL_SIZE(ring->size) | RING_VALID;
/* RPCS */
if (engine->class == RENDER_CLASS) {
diff --git a/include/uapi/drm/i915_drm.h b/include/uapi/drm/i915_drm.h
index 829c0a48577f..2813e579b480 100644
--- a/include/uapi/drm/i915_drm.h
+++ b/include/uapi/drm/i915_drm.h
@@ -1619,6 +1619,27 @@ struct drm_i915_gem_context_param {
* By default, new contexts allow persistence.
*/
#define I915_CONTEXT_PARAM_PERSISTENCE 0xb
+
+/*
+ * I915_CONTEXT_PARAM_RINGSIZE:
+ *
+ * Sets the size of the CS ringbuffer to use for logical ring contexts. This
+ * applies a limit of how many batches can be queued to HW before the caller
+ * is blocked due to lack of space for more commands.
+ *
+ * Only reliably possible to be set prior to first use, i.e. during
+ * construction. At any later point, the current execution must be flushed as
+ * the ring can only be changed while the context is idle. Note, the ringsize
+ * can be specified as a constructor property, see
+ * I915_CONTEXT_CREATE_EXT_SETPARAM, but can also be set later if required.
+ *
+ * Only applies to the current set of engine and lost when those engines
+ * are replaced by a new mapping (see I915_CONTEXT_PARAM_ENGINES).
+ *
+ * Must be between 4 - 512 KiB, in intervals of page size [4 KiB].
+ * Default is 16 KiB.
+ */
+#define I915_CONTEXT_PARAM_RINGSIZE 0xc
/* Must be kept compact -- no holes and well documented */
__u64 value;
--
2.25.0
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