add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/drivers/gpu/arm/bifrost/backend/gpu/mali_kbase_jm_defs.h
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@@ -1,7 +1,7 @@
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 /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
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 /*
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  *
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- * (C) COPYRIGHT 2014-2021 ARM Limited. All rights reserved.
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+ * (C) COPYRIGHT 2014-2022 ARM Limited. All rights reserved.
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  *
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  * This program is free software and is provided to you under the terms of the
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  * GNU General Public License version 2 as published by the Free Software
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@@ -38,10 +38,32 @@
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 	struct kbase_jd_atom *katom;
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 };
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+/* SLOT_RB_TAG_PURGED assumes a value that is different from
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+ * NULL (SLOT_RB_NULL_TAG_VAL) and will not be the result of
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+ * any valid pointer via macro translation: SLOT_RB_TAG_KCTX(x).
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+ */
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+#define SLOT_RB_TAG_PURGED ((u64)(1 << 1))
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+#define SLOT_RB_NULL_TAG_VAL ((u64)0)
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+
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+/**
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+ * SLOT_RB_TAG_KCTX() - a function-like macro for converting a pointer to a
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+ *			u64 for serving as tagged value.
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+ * @kctx: Pointer to kbase context.
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+ */
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+#define SLOT_RB_TAG_KCTX(kctx) (u64)((uintptr_t)(kctx))
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 /**
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  * struct slot_rb - Slot ringbuffer
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  * @entries:		Ringbuffer entries
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- * @last_context:	The last context to submit a job on this slot
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+ * @last_kctx_tagged:	The last context that submitted a job to the slot's
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+ *			HEAD_NEXT register. The value is a tagged variant so
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+ *			must not be dereferenced. It is used in operation to
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+ *			track when shader core L1 caches might contain a
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+ *			previous context's data, and so must only be set to
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+ *			SLOT_RB_NULL_TAG_VAL after reset/powerdown of the
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+ *			cores. In slot job submission, if there is a kctx
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+ *			change, and the relevant katom is configured with
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+ *			BASE_JD_REQ_SKIP_CACHE_START, a L1 read only cache
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+ *			maintenace operation is enforced.
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  * @read_idx:		Current read index of buffer
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  * @write_idx:		Current write index of buffer
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  * @job_chain_flag:	Flag used to implement jobchain disambiguation
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@@ -49,7 +71,7 @@
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 struct slot_rb {
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 	struct rb_entry entries[SLOT_RB_SIZE];
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-	struct kbase_context *last_context;
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+	u64 last_kctx_tagged;
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 	u8 read_idx;
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 	u8 write_idx;