[PATCH 1/4] drm/i915: Drop I915_CONTEXT_PARAM_RINGSIZE

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This reverts commit 88be76cdafc7e60e2e4ed883bfe7e8dd7f35fa3a.  This API
has never been used by any real userspace.

Signed-off-by: Jason Ekstrand <jason@xxxxxxxxxxxxxx>
---
 drivers/gpu/drm/i915/Makefile                 |   1 -
 drivers/gpu/drm/i915/gem/i915_gem_context.c   | 112 ++----------------
 drivers/gpu/drm/i915/gt/intel_context_param.c |  63 ----------
 drivers/gpu/drm/i915/gt/intel_context_param.h |  14 ---
 include/uapi/drm/i915_drm.h                   |  20 +---
 5 files changed, 12 insertions(+), 198 deletions(-)
 delete mode 100644 drivers/gpu/drm/i915/gt/intel_context_param.c
 delete 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 921db06232c35..6825988f0328f 100644
--- a/drivers/gpu/drm/i915/Makefile
+++ b/drivers/gpu/drm/i915/Makefile
@@ -87,7 +87,6 @@ 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 4d2f40cf237bd..c528db3b7dcf4 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_context.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_context.c
@@ -69,7 +69,6 @@
 
 #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 */
@@ -744,32 +743,25 @@ __context_engines_await(const struct i915_gem_context *ctx,
 	return engines;
 }
 
-static int
+static void
 context_apply_all(struct i915_gem_context *ctx,
-		  int (*fn)(struct intel_context *ce, void *data),
+		  void (*fn)(struct intel_context *ce, void *data),
 		  void *data)
 {
 	struct i915_gem_engines_iter it;
 	struct i915_gem_engines *e;
 	struct intel_context *ce;
-	int err = 0;
 
 	e = __context_engines_await(ctx, NULL);
-	for_each_gem_engine(ce, e, it) {
-		err = fn(ce, data);
-		if (err)
-			break;
-	}
+	for_each_gem_engine(ce, e, it)
+		fn(ce, data);
 	i915_sw_fence_complete(&e->fence);
-
-	return err;
 }
 
-static int __apply_ppgtt(struct intel_context *ce, void *vm)
+static void __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 *
@@ -809,10 +801,9 @@ static void __set_timeline(struct intel_timeline **dst,
 		intel_timeline_put(old);
 }
 
-static int __apply_timeline(struct intel_context *ce, void *timeline)
+static void __apply_timeline(struct intel_context *ce, void *timeline)
 {
 	__set_timeline(&ce->timeline, timeline);
-	return 0;
 }
 
 static void __assign_timeline(struct i915_gem_context *ctx,
@@ -1328,63 +1319,6 @@ 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;
-}
-
 int
 i915_gem_user_to_context_sseu(struct intel_gt *gt,
 			      const struct drm_i915_gem_context_param_sseu *user,
@@ -1925,19 +1859,17 @@ set_persistence(struct i915_gem_context *ctx,
 	return __context_set_persistence(ctx, args->value);
 }
 
-static int __apply_priority(struct intel_context *ce, void *arg)
+static void __apply_priority(struct intel_context *ce, void *arg)
 {
 	struct i915_gem_context *ctx = arg;
 
 	if (!intel_engine_has_timeslices(ce->engine))
-		return 0;
+		return;
 
 	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,
@@ -2030,11 +1962,8 @@ 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:
+	case I915_CONTEXT_PARAM_RINGSIZE:
 	default:
 		ret = -EINVAL;
 		break;
@@ -2062,18 +1991,6 @@ 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)
 {
@@ -2118,12 +2035,6 @@ 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;
 	i915_sw_fence_complete(&e->fence);
@@ -2483,11 +2394,8 @@ 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:
+	case I915_CONTEXT_PARAM_RINGSIZE:
 	default:
 		ret = -EINVAL;
 		break;
diff --git a/drivers/gpu/drm/i915/gt/intel_context_param.c b/drivers/gpu/drm/i915/gt/intel_context_param.c
deleted file mode 100644
index 65dcd090245d6..0000000000000
--- a/drivers/gpu/drm/i915/gt/intel_context_param.c
+++ /dev/null
@@ -1,63 +0,0 @@
-// 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
deleted file mode 100644
index f053d8633fe2a..0000000000000
--- a/drivers/gpu/drm/i915/gt/intel_context_param.h
+++ /dev/null
@@ -1,14 +0,0 @@
-/* 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/include/uapi/drm/i915_drm.h b/include/uapi/drm/i915_drm.h
index ddc47bbf48b6d..a80eb2bcd22bc 100644
--- a/include/uapi/drm/i915_drm.h
+++ b/include/uapi/drm/i915_drm.h
@@ -1675,24 +1675,8 @@ struct drm_i915_gem_context_param {
  */
 #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.
+/* This API has been removed.  On the off chance someone somewhere has
+ * attempted to use it, never re-use this context param number.
  */
 #define I915_CONTEXT_PARAM_RINGSIZE	0xc
 /* Must be kept compact -- no holes and well documented */
-- 
2.29.2

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