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

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Message-ID: <38e80ca5-51b6-4ae3-93b5-5795fd108c2e@amd.com>
Date: Tue, 10 Dec 2024 18:31:01 -0600
From: Mario Limonciello <mario.limonciello@....com>
To: Lizhi Hou <lizhi.hou@....com>, ogabbay@...nel.org,
 quic_jhugo@...cinc.com, dri-devel@...ts.freedesktop.org
Cc: linux-kernel@...r.kernel.org, min.ma@....com, max.zhen@....com,
 sonal.santan@....com, king.tam@....com
Subject: Re: [PATCH V2 1/8] accel/amdxdna: Add device status for aie2 devices

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@....com>
Reviewed-by: Mario Limonciello <mario.limonciello@....com>
> ---
>   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);
>