Re: [PATCH V2 1/8] accel/amdxdna: Add device status for aie2 devices

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On 12/6/2024 15:59, Lizhi Hou wrote:
Add device status to track if aie2_hw_start() or aie2_hw_stop() is
re-entered. In aie2_hw_stop(), call drmm_kfree to free mbox.

Signed-off-by: Lizhi Hou <lizhi.hou@xxxxxxx>
Reviewed-by: Mario Limonciello <mario.limonciello@xxxxxxx>
---
  drivers/accel/amdxdna/aie2_pci.c        | 17 +++++++++++++++++
  drivers/accel/amdxdna/aie2_pci.h        |  7 +++++++
  drivers/accel/amdxdna/amdxdna_mailbox.c |  6 ------
  3 files changed, 24 insertions(+), 6 deletions(-)

diff --git a/drivers/accel/amdxdna/aie2_pci.c b/drivers/accel/amdxdna/aie2_pci.c
index 349ada697e48..19c76b2b204b 100644
--- a/drivers/accel/amdxdna/aie2_pci.c
+++ b/drivers/accel/amdxdna/aie2_pci.c
@@ -267,12 +267,22 @@ static void aie2_hw_stop(struct amdxdna_dev *xdna)
  	struct pci_dev *pdev = to_pci_dev(xdna->ddev.dev);
  	struct amdxdna_dev_hdl *ndev = xdna->dev_handle;
+ if (ndev->dev_status <= AIE2_DEV_INIT) {
+		XDNA_ERR(xdna, "device is already stopped");
+		return;
+	}
+
  	aie2_mgmt_fw_fini(ndev);
  	xdna_mailbox_stop_channel(ndev->mgmt_chann);
  	xdna_mailbox_destroy_channel(ndev->mgmt_chann);
+	ndev->mgmt_chann = NULL;
+	drmm_kfree(&xdna->ddev, ndev->mbox);
+	ndev->mbox = NULL;
  	aie2_psp_stop(ndev->psp_hdl);
  	aie2_smu_fini(ndev);
  	pci_disable_device(pdev);
+
+	ndev->dev_status = AIE2_DEV_INIT;
  }
static int aie2_hw_start(struct amdxdna_dev *xdna)
@@ -283,6 +293,11 @@ static int aie2_hw_start(struct amdxdna_dev *xdna)
  	u32 xdna_mailbox_intr_reg;
  	int mgmt_mb_irq, ret;
+ if (ndev->dev_status >= AIE2_DEV_START) {
+		XDNA_INFO(xdna, "device is already started");
+		return 0;
+	}
+
  	ret = pci_enable_device(pdev);
  	if (ret) {
  		XDNA_ERR(xdna, "failed to enable device, ret %d", ret);
@@ -345,6 +360,8 @@ static int aie2_hw_start(struct amdxdna_dev *xdna)
  		goto destroy_mgmt_chann;
  	}
+ ndev->dev_status = AIE2_DEV_START;
+
  	return 0;
destroy_mgmt_chann:
diff --git a/drivers/accel/amdxdna/aie2_pci.h b/drivers/accel/amdxdna/aie2_pci.h
index 6a2686255c9c..1c6f07d9b805 100644
--- a/drivers/accel/amdxdna/aie2_pci.h
+++ b/drivers/accel/amdxdna/aie2_pci.h
@@ -149,6 +149,11 @@ struct amdxdna_hwctx_priv {
  	struct drm_syncobj		*syncobj;
  };
+enum aie2_dev_status {
+	AIE2_DEV_INIT,
+	AIE2_DEV_START,
+};
+
  struct amdxdna_dev_hdl {
  	struct amdxdna_dev		*xdna;
  	const struct amdxdna_dev_priv	*priv;
@@ -171,6 +176,8 @@ struct amdxdna_dev_hdl {
  	struct mailbox			*mbox;
  	struct mailbox_channel		*mgmt_chann;
  	struct async_events		*async_events;
+
+	enum aie2_dev_status		dev_status;
  };
#define DEFINE_BAR_OFFSET(reg_name, bar, reg_addr) \
diff --git a/drivers/accel/amdxdna/amdxdna_mailbox.c b/drivers/accel/amdxdna/amdxdna_mailbox.c
index 415d99abaaa3..eab79dbb8b25 100644
--- a/drivers/accel/amdxdna/amdxdna_mailbox.c
+++ b/drivers/accel/amdxdna/amdxdna_mailbox.c
@@ -530,9 +530,6 @@ xdna_mailbox_create_channel(struct mailbox *mb,
int xdna_mailbox_destroy_channel(struct mailbox_channel *mb_chann)
  {
-	if (!mb_chann)
-		return 0;
-
  	MB_DBG(mb_chann, "IRQ disabled and RX work cancelled");
  	free_irq(mb_chann->msix_irq, mb_chann);
  	destroy_workqueue(mb_chann->work_q);
@@ -548,9 +545,6 @@ int xdna_mailbox_destroy_channel(struct mailbox_channel *mb_chann)
void xdna_mailbox_stop_channel(struct mailbox_channel *mb_chann)
  {
-	if (!mb_chann)
-		return;
-
  	/* Disable an irq and wait. This might sleep. */
  	disable_irq(mb_chann->msix_irq);




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