Message-ID: <b2954b92-8b12-700a-af50-b914af7b0ace@quicinc.com>
Date:   Tue, 16 May 2023 20:32:00 +0530
From:   Krishna Kurapati PSSNV <quic_kriskura@...cinc.com>
To:     Johan Hovold <johan@...nel.org>
CC:     Thinh Nguyen <Thinh.Nguyen@...opsys.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        "Andy Gross" <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        "Konrad Dybcio" <konrad.dybcio@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Felipe Balbi <balbi@...nel.org>, <linux-usb@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <linux-arm-msm@...r.kernel.org>,
        <devicetree@...r.kernel.org>, <quic_pkondeti@...cinc.com>,
        <quic_ppratap@...cinc.com>, <quic_wcheng@...cinc.com>,
        <quic_jackp@...cinc.com>, <quic_harshq@...cinc.com>,
        <ahalaney@...hat.com>
Subject: Re: [PATCH v8 3/9] usb: dwc3: core: Access XHCI address space
 temporarily to read port info



On 5/16/2023 5:41 PM, Johan Hovold wrote:
> On Sun, May 14, 2023 at 11:19:11AM +0530, Krishna Kurapati wrote:
>> Currently host-only capable DWC3 controllers support Multiport.
>> Temporarily map XHCI address space for host-only controllers and parse
>> XHCI Extended Capabilities registers to read number of usb2 ports and
>> usb3 ports present on multiport controller. Each USB Port is at least HS
>> capable.
>>
>> The port info for usb2 and usb3 phy are identified as num_usb2_ports
>> and num_usb3_ports. The intention is as follows:
>>
>> Wherever we need to perform phy operations like:
>>
>> LOOP_OVER_NUMBER_OF_AVAILABLE_PORTS()
>> {
>> 	phy_set_mode(dwc->usb2_generic_phy[i], PHY_MODE_USB_HOST);
>> 	phy_set_mode(dwc->usb3_generic_phy[i], PHY_MODE_USB_HOST);
>> }
>>
>> If number of usb2 ports is 3, loop can go from index 0-2 for
>> usb2_generic_phy. If number of usb3-ports is 2, we don't know for sure,
>> if the first 2 ports are SS capable or some other ports like (2 and 3)
>> are SS capable. So instead, num_usb2_ports is used to loop around all
>> phy's (both hs and ss) for performing phy operations. If any
>> usb3_generic_phy turns out to be NULL, phy operation just bails out.
>>
>> num_usb3_ports is used to modify GUSB3PIPECTL registers while setting up
>> phy's as we need to know how many SS capable ports are there for this.
>>
>> Signed-off-by: Krishna Kurapati <quic_kriskura@...cinc.com>
>> ---
>>   drivers/usb/dwc3/core.c | 113 ++++++++++++++++++++++++++++++++++++++++
>>   drivers/usb/dwc3/core.h |  17 +++++-
>>   2 files changed, 129 insertions(+), 1 deletion(-)
>>
>> diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c
>> index 0beaab932e7d..e983aef1fb93 100644
>> --- a/drivers/usb/dwc3/core.c
>> +++ b/drivers/usb/dwc3/core.c
>> @@ -1767,6 +1767,104 @@ static int dwc3_get_clocks(struct dwc3 *dwc)
>>   	return 0;
>>   }
>>   
>> +/**
>> + * dwc3_xhci_find_next_ext_cap - Find the offset of the extended capabilities
>> + *					with capability ID id.
>> + *
>> + * @base:	PCI MMIO registers base address.
>> + * @start:	address at which to start looking, (0 or HCC_PARAMS to start at
>> + *		beginning of list)
>> + * @id:		Extended capability ID to search for, or 0 for the next
>> + *		capability
>> + *
>> + * Returns the offset of the next matching extended capability structure.
>> + * Some capabilities can occur several times, e.g., the XHCI_EXT_CAPS_PROTOCOL,
>> + * and this provides a way to find them all.
>> + */
>> +static int dwc3_xhci_find_next_ext_cap(void __iomem *base, u32 start, int id)
>> +{
>> +	u32 val;
>> +	u32 next;
>> +	u32 offset;
>> +
>> +	offset = start;
>> +	if (!start || start == XHCI_HCC_PARAMS_OFFSET) {
>> +		val = readl(base + XHCI_HCC_PARAMS_OFFSET);
>> +		if (val == ~0)
>> +			return 0;
>> +		offset = XHCI_HCC_EXT_CAPS(val) << 2;
>> +		if (!offset)
>> +			return 0;
>> +	}
>> +	do {
>> +		val = readl(base + offset);
>> +		if (val == ~0)
>> +			return 0;
>> +		if (offset != start && (id == 0 || XHCI_EXT_CAPS_ID(val) == id))
>> +			return offset;
>> +
>> +		next = XHCI_EXT_CAPS_NEXT(val);
>> +		offset += next << 2;
>> +	} while (next);
>> +
>> +	return 0;
>> +}
> 
> You should not make another copy of xhci_find_next_ext_cap(), but rather
> use it directly.
> 
> We already have drivers outside of usb/host using this function so it
> should be fine to do the same for now:
> 
> 	#include "../host/xhci-ext-caps.h"
> 
Hi Johan,

   This was the approach which we followed when we first introduced the 
patch [1]. But Thinh suggested to duplicate code so that we can avoid 
any dependency on xhci (which seems to be right). So since its just one 
function, I duplicated it here.


>> +static int dwc3_read_port_info(struct dwc3 *dwc)
>> +{
>> +	void __iomem		*regs;
> 
> Call this one 'base' instead.
> 
>> +	u32			offset;
>> +	u32			temp;
> 
> I see that the xhci driver use 'temp' for this, but I'd prefer 'val'.
> 
>> +	u8			major_revision;
>> +	int			ret = 0;
>> +
>> +	/*
>> +	 * Remap xHCI address space to access XHCI ext cap regs,
>> +	 * since it is needed to get port info.
>> +	 */
>> +	regs = ioremap(dwc->xhci_resources[0].start,
>> +				resource_size(&dwc->xhci_resources[0]));
>> +	if (IS_ERR(regs))
>> +		return PTR_ERR(regs);
>> +
>> +	offset = dwc3_xhci_find_next_ext_cap(regs, 0,
>> +					XHCI_EXT_CAPS_PROTOCOL);
>> +	while (offset) {
> 
> This would be better implemented as a do-while loop (cf.
> xdbc_reset_debug_port()).
> 
>> +		temp = readl(regs + offset);
>> +		major_revision = XHCI_EXT_PORT_MAJOR(temp);
>> +
>> +		temp = readl(regs + offset + 0x08);
> 
> We should try to avoid magic constants, but I see that we already have
> cases accessing these fields like this.
> 
>> +		if (major_revision == 0x03) {
>> +			dwc->num_usb3_ports += XHCI_EXT_PORT_COUNT(temp);
>> +		} else if (major_revision <= 0x02) {
>> +			dwc->num_usb2_ports += XHCI_EXT_PORT_COUNT(temp);
>> +		} else {
>> +			dev_err(dwc->dev,
>> +				"Unrecognized port major revision %d\n", major_revision);
> 
> Please add a line break after the string.
> 
> Perhaps this should be handles as in xhci core by simply warning and
> continuing instead.
> 
I broke the loop and went to unmap as we are not sure what values would 
be read. Any use of continuing ?

>> +			ret = -EINVAL;
>> +			goto unmap_reg;
>> +		}
>> +
>> +		offset = dwc3_xhci_find_next_ext_cap(regs, offset,
>> +						XHCI_EXT_CAPS_PROTOCOL);
>> +	}
>> +
>> +	temp = readl(regs + DWC3_XHCI_HCSPARAMS1);
>> +	if (HCS_MAX_PORTS(temp) != (dwc->num_usb3_ports + dwc->num_usb2_ports)) {
>> +		dev_err(dwc->dev,
>> +			"Mismatched reported MAXPORTS (%d)\n", HCS_MAX_PORTS(temp));
>> +		ret = -EINVAL;
>> +		goto unmap_reg;
>> +	}
> 
> Not sure this is needed either.
> 
> Could this risk regressing platforms which does not have currently have
> all PHYs described in DT?
> 
No, it doesn't. AFAIK, this only tells how many ports are present as per 
the core consultant configuration of the device. I tried to explain what 
would happen incase phy's are not present in DT in [2] & [3].

> You do however need to make sure that both num_usb<n>_ports is no larger
> than MAX_PORTS_SUPPORTED to avoid memory corruption when you're adding
> fixed sized arrays for the PHYs later in the series.
> 
>> +
>> +	dev_dbg(dwc->dev,
>> +		"hs-ports: %d ss-ports: %d\n", dwc->num_usb2_ports, dwc->num_usb3_ports);
> 
> Use %u for unsigned values.
> 
> And please try to stay within 80 columns.
> 
Thanks for catching this potential bug. Will add that if check as well 
in v9.

>> +
>> +unmap_reg:
>> +	iounmap(regs);
>> +	return ret;
>> +}
>> +
>>   static int dwc3_probe(struct platform_device *pdev)
>>   {
>>   	struct device		*dev = &pdev->dev;
>> @@ -1774,6 +1872,7 @@ static int dwc3_probe(struct platform_device *pdev)
>>   	void __iomem		*regs;
>>   	struct dwc3		*dwc;
>>   	int			ret;
>> +	unsigned int		hw_mode;
>>   
>>   	dwc = devm_kzalloc(dev, sizeof(*dwc), GFP_KERNEL);
>>   	if (!dwc)
>> @@ -1843,6 +1942,20 @@ static int dwc3_probe(struct platform_device *pdev)
>>   			goto err_disable_clks;
>>   	}
>>   
>> +	/*
>> +	 * Currently DWC3 controllers that are host-only capable
>> +	 * support Multiport
> 
> Are you missing an "only" after "Currently" above?
> > Please add a full stop.
>
>> +	 */
>> +	hw_mode = DWC3_GHWPARAMS0_MODE(dwc->hwparams.hwparams0);
>> +	if (hw_mode == DWC3_GHWPARAMS0_MODE_HOST) {
>> +		ret = dwc3_read_port_info(dwc);
>> +		if (ret)
>> +			goto err_disable_clks;
>> +	} else {
>> +		dwc->num_usb2_ports = 1;
>> +		dwc->num_usb3_ports = 1;
>> +	}
>> +
>>   	spin_lock_init(&dwc->lock);
>>   	mutex_init(&dwc->mutex);
>>   
>> diff --git a/drivers/usb/dwc3/core.h b/drivers/usb/dwc3/core.h
>> index d56457c02996..d3401963bc27 100644
>> --- a/drivers/usb/dwc3/core.h
>> +++ b/drivers/usb/dwc3/core.h
>> @@ -35,6 +35,17 @@
>>   
>>   #define DWC3_MSG_MAX	500
>>   
>> +/* Define XHCI Extcap register offsets for getting multiport info */
>> +#define XHCI_HCC_PARAMS_OFFSET	0x10
>> +#define DWC3_XHCI_HCSPARAMS1	0x04
>> +#define XHCI_EXT_CAPS_PROTOCOL	2
>> +#define XHCI_HCC_EXT_CAPS(x)    (((x) >> 16) & 0xffff)
>> +#define XHCI_EXT_CAPS_ID(x)     (((x) >> 0) & 0xff)
>> +#define XHCI_EXT_CAPS_NEXT(x)   (((x) >> 8) & 0xff)
>> +#define XHCI_EXT_PORT_MAJOR(x)  (((x) >> 24) & 0xff)
>> +#define XHCI_EXT_PORT_COUNT(x)  (((x) >> 8) & 0xff)
>> +#define HCS_MAX_PORTS(x)        (((x) >> 24) & 0x7f)
>> +
> 
> You should use the xhci defines instead of these copies too.
> 
>>   /* Global constants */
>>   #define DWC3_PULL_UP_TIMEOUT	500	/* ms */
>>   #define DWC3_BOUNCE_SIZE	1024	/* size of a superspeed bulk */
>> @@ -1025,6 +1036,8 @@ struct dwc3_scratchpad_array {
>>    * @usb_psy: pointer to power supply interface.
>>    * @usb2_phy: pointer to USB2 PHY
>>    * @usb3_phy: pointer to USB3 PHY
>> + * @num_usb2_ports: number of usb2 ports.
>> + * @num_usb3_ports: number of usb3 ports.
> 
> Use upper case "USBn" and drop the full stops for consistency.
> 
> Please move these after the PHY structures.
> 
>>    * @usb2_generic_phy: pointer to USB2 PHY
>>    * @usb3_generic_phy: pointer to USB3 PHY
>>    * @phys_ready: flag to indicate that PHYs are ready
>> @@ -1162,6 +1175,9 @@ struct dwc3 {
>>   	struct usb_phy		*usb2_phy;
>>   	struct usb_phy		*usb3_phy;
>>   
>> +	u8			num_usb2_ports;
>> +	u8			num_usb3_ports;
>> +
>>   	struct phy		*usb2_generic_phy;
>>   	struct phy		*usb3_generic_phy;
>>   
>> @@ -1649,5 +1665,4 @@ static inline int dwc3_ulpi_init(struct dwc3 *dwc)
>>   static inline void dwc3_ulpi_exit(struct dwc3 *dwc)
>>   { }
>>   #endif
>> -
> 
> This is an unrelated change that should be dropped.
> 
>>   #endif /* __DRIVERS_USB_DWC3_CORE_H */
> 
> Johan

[1]: 
https://lore.kernel.org/all/20230310163420.7582-3-quic_kriskura@quicinc.com/

[2]: 
https://lore.kernel.org/all/4eb26a54-148b-942f-01c6-64e66541de8b@quicinc.com/

[3]: 
https://lore.kernel.org/all/966c1001-6d64-9163-0c07-96595156fc8c@quicinc.com/

Thanks for the review and comments 🙂. Will make sure to fix them in v9.

Regards,
Krishna,

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