linux-kernel - Re: [PATCH v2 3/5] PCI: endpoint: pci-epf-test: add doorbell test

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Message-ID: <f89afd2c-8870-077c-b4b4-368784f6d54c@amd.com>
Date:   Fri, 29 Sep 2023 15:03:35 +0530
From:   Kishon Vijay Abraham I <kvijayab@....com>
To:     Frank Li <Frank.Li@....com>, manivannan.sadhasivam@...aro.org
Cc:     aisheng.dong@....com, bhelgaas@...gle.com,
        devicetree@...r.kernel.org, festevam@...il.com,
        imx@...ts.linux.dev, jdmason@...zu.us, kernel@...gutronix.de,
        kishon@...nel.org, kw@...ux.com,
        linux-arm-kernel@...ts.infradead.org, linux-imx@....com,
        linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org,
        lorenzo.pieralisi@....com, lpieralisi@...nel.org, maz@...nel.org,
        s.hauer@...gutronix.de, shawnguo@...nel.org, tglx@...utronix.de
Subject: Re: [PATCH v2 3/5] PCI: endpoint: pci-epf-test: add doorbell test

Hi Frank,

On 9/12/2023 3:39 AM, Frank Li wrote:
> Add three register: doorbell_bar, doorbell_addr, doorbell_data,
> doorbell_done. Call pci_epf_alloc_doorbell() all a doorbell address space.
> 
> Root complex(RC) side driver can trigger pci-epc-test's doorbell callback
> handler by write doorbell_data to mapped doorbell_bar's address space.
> 
> pci-epc-test will set doorbell_done in doorbell callback.
> 
> Signed-off-by: Frank Li <Frank.Li@....com>
> ---
>   drivers/pci/endpoint/functions/pci-epf-test.c | 59 ++++++++++++++++++-
>   1 file changed, 58 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/pci/endpoint/functions/pci-epf-test.c b/drivers/pci/endpoint/functions/pci-epf-test.c
> index 1f0d2b84296a3..566549919b87b 100644
> --- a/drivers/pci/endpoint/functions/pci-epf-test.c
> +++ b/drivers/pci/endpoint/functions/pci-epf-test.c
> @@ -11,6 +11,7 @@
>   #include <linux/dmaengine.h>
>   #include <linux/io.h>
>   #include <linux/module.h>
> +#include <linux/msi.h>
>   #include <linux/slab.h>
>   #include <linux/pci_ids.h>
>   #include <linux/random.h>
> @@ -39,17 +40,21 @@
>   #define STATUS_IRQ_RAISED		BIT(6)
>   #define STATUS_SRC_ADDR_INVALID		BIT(7)
>   #define STATUS_DST_ADDR_INVALID		BIT(8)
> +#define STATUS_DOORBELL_SUCCESS		BIT(9)
>   
>   #define FLAG_USE_DMA			BIT(0)
>   
>   #define TIMER_RESOLUTION		1
>   
> +#define MAGIC_VERSION_MASK		GENMASK(7, 0)
> +
>   static struct workqueue_struct *kpcitest_workqueue;
>   
>   struct pci_epf_test {
>   	void			*reg[PCI_STD_NUM_BARS];
>   	struct pci_epf		*epf;
>   	enum pci_barno		test_reg_bar;
> +	enum pci_barno		doorbell_bar;
>   	size_t			msix_table_offset;
>   	struct delayed_work	cmd_handler;
>   	struct dma_chan		*dma_chan_tx;
> @@ -74,6 +79,9 @@ struct pci_epf_test_reg {
>   	u32	irq_type;
>   	u32	irq_number;
>   	u32	flags;
> +	u32	doorbell_bar;

You could extend test_reg_bar for doorbell to avoid using additional BAR.


> +	u32	doorbell_addr;
> +	u32	doorbell_data;
>   } __packed;
>   

Thanks,
Kishon