linux-kernel - [PATCH 5.15 043/177] dmaengine: idxd: add halt interrupt support

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Message-Id: <20211220143041.554477535@linuxfoundation.org>
Date:   Mon, 20 Dec 2021 15:33:13 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Dave Jiang <dave.jiang@...el.com>,
        Vinod Koul <vkoul@...nel.org>, Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.15 043/177] dmaengine: idxd: add halt interrupt support

From: Dave Jiang <dave.jiang@...el.com>

[ Upstream commit 88d97ea82cbe352851a8654ee952d3a694c8c2c6 ]

Add halt interrupt support. Given that the misc interrupt handler already
check halt state, the driver just need to run the halt handling code when
receiving the halt interrupt.

Signed-off-by: Dave Jiang <dave.jiang@...el.com>
Link: https://lore.kernel.org/r/163114224352.846654.14334468363464318828.stgit@djiang5-desk3.ch.intel.com
Signed-off-by: Vinod Koul <vkoul@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/dma/idxd/irq.c       | 5 +++++
 drivers/dma/idxd/registers.h | 1 +
 2 files changed, 6 insertions(+)

diff --git a/drivers/dma/idxd/irq.c b/drivers/dma/idxd/irq.c
index ca88fa7a328e7..3261ea247e832 100644
--- a/drivers/dma/idxd/irq.c
+++ b/drivers/dma/idxd/irq.c
@@ -63,6 +63,9 @@ static int process_misc_interrupts(struct idxd_device *idxd, u32 cause)
 	int i;
 	bool err = false;
 
+	if (cause & IDXD_INTC_HALT_STATE)
+		goto halt;
+
 	if (cause & IDXD_INTC_ERR) {
 		spin_lock(&idxd->dev_lock);
 		for (i = 0; i < 4; i++)
@@ -121,6 +124,7 @@ static int process_misc_interrupts(struct idxd_device *idxd, u32 cause)
 	if (!err)
 		return 0;
 
+halt:
 	gensts.bits = ioread32(idxd->reg_base + IDXD_GENSTATS_OFFSET);
 	if (gensts.state == IDXD_DEVICE_STATE_HALT) {
 		idxd->state = IDXD_DEV_HALTED;
@@ -134,6 +138,7 @@ static int process_misc_interrupts(struct idxd_device *idxd, u32 cause)
 			queue_work(idxd->wq, &idxd->work);
 		} else {
 			spin_lock(&idxd->dev_lock);
+			idxd->state = IDXD_DEV_HALTED;
 			idxd_wqs_quiesce(idxd);
 			idxd_wqs_unmap_portal(idxd);
 			idxd_device_clear_state(idxd);
diff --git a/drivers/dma/idxd/registers.h b/drivers/dma/idxd/registers.h
index ffc7550a77eeb..97ffb06de9b0d 100644
--- a/drivers/dma/idxd/registers.h
+++ b/drivers/dma/idxd/registers.h
@@ -158,6 +158,7 @@ enum idxd_device_reset_type {
 #define IDXD_INTC_CMD			0x02
 #define IDXD_INTC_OCCUPY			0x04
 #define IDXD_INTC_PERFMON_OVFL		0x08
+#define IDXD_INTC_HALT_STATE		0x10
 
 #define IDXD_CMD_OFFSET			0xa0
 union idxd_command_reg {
-- 
2.33.0