linux-kernel - [PATCH v2 04/12] soc: mediatek: cmdq: Add cmdq_pkt_jump

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Date: Thu, 22 Feb 2024 15:41:12 +0000
From: Chun-Kuang Hu <chunkuang.hu@...nel.org>
To: Matthias Brugger <matthias.bgg@...il.com>,
	AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>,
	Mauro Carvalho Chehab <mchehab@...nel.org>,
	Moudy Ho <moudy.ho@...iatek.com>,
	"Jason-JH . Lin" <jason-jh.lin@...iatek.com>,
	linux-arm-kernel@...ts.infradead.org,
	linux-mediatek@...ts.infradead.org,
	dri-devel@...ts.freedesktop.org,
	linux-kernel@...r.kernel.org,
	linux-media@...r.kernel.org
Cc: Chun-Kuang Hu <chunkuang.hu@...nel.org>
Subject: [PATCH v2 04/12] soc: mediatek: cmdq: Add cmdq_pkt_jump_rel() helper function

cmdq_pkt_jump_rel() append relative jump command to the packet.
Relative jump change PC to the target address with offset from
current PC.

Signed-off-by: Chun-Kuang Hu <chunkuang.hu@...nel.org>
---
 drivers/soc/mediatek/mtk-cmdq-helper.c | 10 ++++++++++
 include/linux/soc/mediatek/mtk-cmdq.h  | 19 +++++++++++++++++++
 2 files changed, 29 insertions(+)

diff --git a/drivers/soc/mediatek/mtk-cmdq-helper.c b/drivers/soc/mediatek/mtk-cmdq-helper.c
index 38d9077725d2..678db09983d4 100644
--- a/drivers/soc/mediatek/mtk-cmdq-helper.c
+++ b/drivers/soc/mediatek/mtk-cmdq-helper.c
@@ -404,6 +404,16 @@ int cmdq_pkt_jump_abs(struct cmdq_pkt *pkt, dma_addr_t addr, u8 shift_pa)
 }
 EXPORT_SYMBOL(cmdq_pkt_jump_abs);
 
+int cmdq_pkt_jump_rel(struct cmdq_pkt *pkt, s32 offset, u8 shift_pa)
+{
+	struct cmdq_instruction inst = { {0} };
+
+	inst.op = CMDQ_CODE_JUMP;
+	inst.value = (u32)offset >> shift_pa;
+	return cmdq_pkt_append_command(pkt, inst);
+}
+EXPORT_SYMBOL(cmdq_pkt_jump_rel);
+
 int cmdq_pkt_finalize(struct cmdq_pkt *pkt)
 {
 	struct cmdq_instruction inst = { {0} };
diff --git a/include/linux/soc/mediatek/mtk-cmdq.h b/include/linux/soc/mediatek/mtk-cmdq.h
index f9b8608cb5d9..a935cd69d80f 100644
--- a/include/linux/soc/mediatek/mtk-cmdq.h
+++ b/include/linux/soc/mediatek/mtk-cmdq.h
@@ -261,6 +261,20 @@ int cmdq_pkt_assign(struct cmdq_pkt *pkt, u16 reg_idx, u32 value);
  */
 int cmdq_pkt_jump_abs(struct cmdq_pkt *pkt, dma_addr_t addr, u8 shift_pa);
 
+/**
+ * cmdq_pkt_jump_rel() - Append jump command to the CMDQ packet, ask GCE
+ *			 to execute an instruction that change current thread
+ *			 PC to a physical address with relative offset. The
+ *			 target address should contains more instruction.
+ * @pkt:	the CMDQ packet
+ * @offset:	relative offset of target instruction buffer from current PC.
+ * @shift_pa:	shift bits of physical address in CMDQ instruction. This value
+ *		is got by cmdq_get_shift_pa().
+ *
+ * Return: 0 for success; else the error code is returned
+ */
+int cmdq_pkt_jump_rel(struct cmdq_pkt *pkt, s32 offset, u8 shift_pa);
+
 /**
  * cmdq_pkt_finalize() - Append EOC and jump command to pkt.
  * @pkt:	the CMDQ packet
@@ -382,6 +396,11 @@ static inline int cmdq_pkt_jump_abs(struct cmdq_pkt *pkt, dma_addr_t addr, u8 sh
 	return -EINVAL;
 }
 
+static inline int cmdq_pkt_jump_rel(struct cmdq_pkt *pkt, s32 offset, u8 shift_pa)
+{
+	return -EINVAL;
+}
+
 static inline int cmdq_pkt_finalize(struct cmdq_pkt *pkt)
 {
 	return -EINVAL;
-- 
2.34.1