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Wed, 17 May 2023 03:11:03 +0000 Received: from nalasex01a.na.qualcomm.com (nalasex01a.na.qualcomm.com [10.47.209.196]) by NALASPPMTA03.qualcomm.com (8.17.1.5/8.17.1.5) with ESMTPS id 34H3Asx9007178 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Wed, 17 May 2023 03:10:54 GMT Received: from [10.216.35.75] (10.80.80.8) by nalasex01a.na.qualcomm.com (10.47.209.196) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.986.42; Tue, 16 May 2023 20:10:48 -0700 Message-ID: Date: Wed, 17 May 2023 08:40:45 +0530 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:102.0) Gecko/20100101 Thunderbird/102.9.1 Subject: Re: [PATCH v8 3/9] usb: dwc3: core: Access XHCI address space temporarily to read port info From: Krishna Kurapati PSSNV To: Johan Hovold , Thinh Nguyen CC: Thinh Nguyen , Greg Kroah-Hartman , Philipp Zabel , "Andy Gross" , Bjorn Andersson , "Konrad Dybcio" , Rob Herring , Krzysztof Kozlowski , Felipe Balbi , , , , , , , , , , References: <20230514054917.21318-1-quic_kriskura@quicinc.com> <20230514054917.21318-4-quic_kriskura@quicinc.com> Content-Language: en-US In-Reply-To: Content-Type: text/plain; charset="UTF-8"; format=flowed Content-Transfer-Encoding: 8bit X-Originating-IP: [10.80.80.8] X-ClientProxiedBy: nasanex01b.na.qualcomm.com (10.46.141.250) To nalasex01a.na.qualcomm.com (10.47.209.196) X-QCInternal: smtphost X-Proofpoint-Virus-Version: vendor=nai engine=6200 definitions=5800 signatures=585085 X-Proofpoint-GUID: BVyr8UUyyVeryjXvGK61Tlq_KYVW82Zl X-Proofpoint-ORIG-GUID: BVyr8UUyyVeryjXvGK61Tlq_KYVW82Zl X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.254,Aquarius:18.0.957,Hydra:6.0.573,FMLib:17.11.170.22 definitions=2023-05-16_14,2023-05-16_01,2023-02-09_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 malwarescore=0 clxscore=1015 adultscore=0 priorityscore=1501 mlxlogscore=999 bulkscore=0 suspectscore=0 impostorscore=0 phishscore=0 lowpriorityscore=0 mlxscore=0 spamscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2304280000 definitions=main-2305170025 X-Spam-Status: No, score=-4.8 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,NICE_REPLY_A,SPF_HELO_NONE, SPF_PASS,T_SCC_BODY_TEXT_LINE,URIBL_BLOCKED autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 5/16/2023 8:32 PM, Krishna Kurapati PSSNV wrote: > > > 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 >>> --- >>>   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. > Hi Thinh, Would like to know your opinion here on how to proceed further. Regards, Krishna, > >>> +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_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,