[PATCH RFC 23/24] drm/lima: add context related functions

[Qiang Yu <yuq825@gmail.com>]

Signed-off-by: Qiang Yu <yuq825@gmail.com>
---
 drivers/gpu/drm/lima/lima_ctx.c | 143 ++++++++++++++++++++++++++++++++
 drivers/gpu/drm/lima/lima_ctx.h |  51 ++++++++++++
 2 files changed, 194 insertions(+)
 create mode 100644 drivers/gpu/drm/lima/lima_ctx.c
 create mode 100644 drivers/gpu/drm/lima/lima_ctx.h

diff --git a/drivers/gpu/drm/lima/lima_ctx.c b/drivers/gpu/drm/lima/lima_ctx.c
new file mode 100644
index 000000000000..7243861760b4
--- /dev/null
+++ b/drivers/gpu/drm/lima/lima_ctx.c
@@ -0,0 +1,143 @@
+/*
+ * Copyright (C) 2017-2018 Lima Project
+ *
+ * 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 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 COPYRIGHT HOLDER(S) OR AUTHOR(S) 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/slab.h>
+
+#include "lima_device.h"
+#include "lima_ctx.h"
+
+int lima_ctx_create(struct lima_device *dev, struct lima_ctx_mgr *mgr, u32 *id)
+{
+	struct lima_ctx *ctx;
+	int i, err;
+
+	ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
+	if (!ctx)
+		return -ENOMEM;
+	ctx->dev = dev;
+	kref_init(&ctx->refcnt);
+
+	for (i = 0; i < lima_pipe_num; i++) {
+		err = lima_sched_context_init(dev->pipe + i, ctx->context + i, &ctx->guilty);
+		if (err)
+			goto err_out0;
+	}
+
+	idr_preload(GFP_KERNEL);
+	spin_lock(&mgr->lock);
+	err = idr_alloc(&mgr->handles, ctx, 1, 0, GFP_ATOMIC);
+	spin_unlock(&mgr->lock);
+	idr_preload_end();
+	if (err < 0)
+		goto err_out0;
+
+	*id = err;
+	return 0;
+
+err_out0:
+	for (i--; i >= 0; i--)
+		lima_sched_context_fini(dev->pipe + i, ctx->context + i);
+	kfree(ctx);
+	return err;
+}
+
+static void lima_ctx_do_release(struct kref *ref)
+{
+	struct lima_ctx *ctx = container_of(ref, struct lima_ctx, refcnt);
+	int i;
+
+	for (i = 0; i < lima_pipe_num; i++)
+		lima_sched_context_fini(ctx->dev->pipe + i, ctx->context + i);
+	kfree(ctx);
+}
+
+int lima_ctx_free(struct lima_ctx_mgr *mgr, u32 id)
+{
+	struct lima_ctx *ctx;
+
+	spin_lock(&mgr->lock);
+	ctx = idr_remove(&mgr->handles, id);
+	spin_unlock(&mgr->lock);
+
+	if (ctx) {
+		kref_put(&ctx->refcnt, lima_ctx_do_release);
+		return 0;
+	}
+	return -EINVAL;
+}
+
+struct lima_ctx *lima_ctx_get(struct lima_ctx_mgr *mgr, u32 id)
+{
+	struct lima_ctx *ctx;
+
+	spin_lock(&mgr->lock);
+	ctx = idr_find(&mgr->handles, id);
+	if (ctx)
+		kref_get(&ctx->refcnt);
+	spin_unlock(&mgr->lock);
+	return ctx;
+}
+
+void lima_ctx_put(struct lima_ctx *ctx)
+{
+	kref_put(&ctx->refcnt, lima_ctx_do_release);
+}
+
+void lima_ctx_mgr_init(struct lima_ctx_mgr *mgr)
+{
+        spin_lock_init(&mgr->lock);
+	idr_init(&mgr->handles);
+}
+
+void lima_ctx_mgr_fini(struct lima_ctx_mgr *mgr)
+{
+	struct lima_ctx *ctx;
+	struct idr *idp;
+	uint32_t id;
+
+	idp = &mgr->handles;
+
+	idr_for_each_entry(idp, ctx, id) {
+	        kref_put(&ctx->refcnt, lima_ctx_do_release);
+	}
+
+	idr_destroy(&mgr->handles);
+}
+
+struct dma_fence *lima_ctx_get_native_fence(struct lima_ctx_mgr *mgr,
+					    u32 ctx, u32 pipe, u32 seq)
+{
+	struct lima_ctx *c;
+	struct dma_fence *ret;
+
+	if (pipe >= lima_pipe_num)
+		return ERR_PTR(-EINVAL);
+
+	c = lima_ctx_get(mgr, ctx);
+	if (!c)
+		return ERR_PTR(-ENOENT);
+
+	ret = lima_sched_context_get_fence(c->context + pipe, seq);
+
+	lima_ctx_put(c);
+	return ret;
+}
diff --git a/drivers/gpu/drm/lima/lima_ctx.h b/drivers/gpu/drm/lima/lima_ctx.h
new file mode 100644
index 000000000000..591f64532772
--- /dev/null
+++ b/drivers/gpu/drm/lima/lima_ctx.h
@@ -0,0 +1,51 @@
+/*
+ * Copyright (C) 2017-2018 Lima Project
+ *
+ * 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 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 COPYRIGHT HOLDER(S) OR AUTHOR(S) 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.
+ */
+#ifndef __LIMA_CTX_H__
+#define __LIMA_CTX_H__
+
+#include <linux/idr.h>
+
+#include "lima_device.h"
+
+struct lima_ctx {
+	struct kref refcnt;
+	struct lima_device *dev;
+	struct lima_sched_context context[lima_pipe_num];
+	atomic_t guilty;
+};
+
+struct lima_ctx_mgr {
+	spinlock_t lock;
+	struct idr handles;
+};
+
+int lima_ctx_create(struct lima_device *dev, struct lima_ctx_mgr *mgr, u32 *id);
+int lima_ctx_free(struct lima_ctx_mgr *mgr, u32 id);
+struct lima_ctx *lima_ctx_get(struct lima_ctx_mgr *mgr, u32 id);
+void lima_ctx_put(struct lima_ctx *ctx);
+void lima_ctx_mgr_init(struct lima_ctx_mgr *mgr);
+void lima_ctx_mgr_fini(struct lima_ctx_mgr *mgr);
+
+struct dma_fence *lima_ctx_get_native_fence(struct lima_ctx_mgr *mgr,
+					    u32 ctx, u32 pipe, u32 seq);
+
+#endif
-- 
2.17.0

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