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Message-ID: <202210202357.64gsQQRv-lkp@intel.com>
Date:   Thu, 20 Oct 2022 23:13:49 +0800
From:   kernel test robot <lkp@...el.com>
To:     wangwenmei168@....com, mathias.nyman@...el.com,
        gregkh@...uxfoundation.org, linux-usb@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     kbuild-all@...ts.01.org, gehao <gehao@...inos.cn>
Subject: Re: [RESEND PATCH] xhci: Fix Renesas PCIe controllers passthrough
 issue

Hi,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on usb/usb-testing]
[also build test WARNING on linus/master v6.1-rc1 next-20221020]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/wangwenmei168-163-com/xhci-Fix-Renesas-PCIe-controllers-passthrough-issue/20221020-183913
base:   https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing
patch link:    https://lore.kernel.org/r/20221020103914.262202-1-wangwenmei168%40163.com
patch subject: [RESEND PATCH] xhci: Fix Renesas PCIe controllers passthrough issue
config: i386-randconfig-a003
compiler: gcc-11 (Debian 11.3.0-8) 11.3.0
reproduce (this is a W=1 build):
        # https://github.com/intel-lab-lkp/linux/commit/8398c1621f41a99e7fe38f1c7c705ea1c61f2411
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review wangwenmei168-163-com/xhci-Fix-Renesas-PCIe-controllers-passthrough-issue/20221020-183913
        git checkout 8398c1621f41a99e7fe38f1c7c705ea1c61f2411
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        make W=1 O=build_dir ARCH=i386 SHELL=/bin/bash drivers/usb/host/

If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <lkp@...el.com>

All warnings (new ones prefixed by >>):

   drivers/usb/host/xhci.c: In function 'xhci_zero_64b_regs':
>> drivers/usb/host/xhci.c:230:24: warning: unused variable 'dev' [-Wunused-variable]
     230 |         struct device *dev = xhci_to_hcd(xhci)->self.sysdev;
         |                        ^~~


vim +/dev +230 drivers/usb/host/xhci.c

66d4eadd8d0672 drivers/usb/host/xhci-hcd.c Sarah Sharp   2009-04-27  227  
12de0a35c996c3 drivers/usb/host/xhci.c     Marc Zyngier  2018-05-23  228  static void xhci_zero_64b_regs(struct xhci_hcd *xhci)
12de0a35c996c3 drivers/usb/host/xhci.c     Marc Zyngier  2018-05-23  229  {
12de0a35c996c3 drivers/usb/host/xhci.c     Marc Zyngier  2018-05-23 @230  	struct device *dev = xhci_to_hcd(xhci)->self.sysdev;
12de0a35c996c3 drivers/usb/host/xhci.c     Marc Zyngier  2018-05-23  231  	int err, i;
12de0a35c996c3 drivers/usb/host/xhci.c     Marc Zyngier  2018-05-23  232  	u64 val;
286fd02fd54b6a drivers/usb/host/xhci.c     Mathias Nyman 2021-04-06  233  	u32 intrs;
12de0a35c996c3 drivers/usb/host/xhci.c     Marc Zyngier  2018-05-23  234  
12de0a35c996c3 drivers/usb/host/xhci.c     Marc Zyngier  2018-05-23  235  	/*
12de0a35c996c3 drivers/usb/host/xhci.c     Marc Zyngier  2018-05-23  236  	 * Some Renesas controllers get into a weird state if they are
12de0a35c996c3 drivers/usb/host/xhci.c     Marc Zyngier  2018-05-23  237  	 * reset while programmed with 64bit addresses (they will preserve
12de0a35c996c3 drivers/usb/host/xhci.c     Marc Zyngier  2018-05-23  238  	 * the top half of the address in internal, non visible
12de0a35c996c3 drivers/usb/host/xhci.c     Marc Zyngier  2018-05-23  239  	 * registers). You end up with half the address coming from the
12de0a35c996c3 drivers/usb/host/xhci.c     Marc Zyngier  2018-05-23  240  	 * kernel, and the other half coming from the firmware. Also,
12de0a35c996c3 drivers/usb/host/xhci.c     Marc Zyngier  2018-05-23  241  	 * changing the programming leads to extra accesses even if the
12de0a35c996c3 drivers/usb/host/xhci.c     Marc Zyngier  2018-05-23  242  	 * controller is supposed to be halted. The controller ends up with
12de0a35c996c3 drivers/usb/host/xhci.c     Marc Zyngier  2018-05-23  243  	 * a fatal fault, and is then ripe for being properly reset.
12de0a35c996c3 drivers/usb/host/xhci.c     Marc Zyngier  2018-05-23  244  	 */
8398c1621f41a9 drivers/usb/host/xhci.c     gehao         2022-10-20  245  	if (!(xhci->quirks & XHCI_ZERO_64B_REGS))
12de0a35c996c3 drivers/usb/host/xhci.c     Marc Zyngier  2018-05-23  246  		return;
12de0a35c996c3 drivers/usb/host/xhci.c     Marc Zyngier  2018-05-23  247  
12de0a35c996c3 drivers/usb/host/xhci.c     Marc Zyngier  2018-05-23  248  	xhci_info(xhci, "Zeroing 64bit base registers, expecting fault\n");
12de0a35c996c3 drivers/usb/host/xhci.c     Marc Zyngier  2018-05-23  249  
12de0a35c996c3 drivers/usb/host/xhci.c     Marc Zyngier  2018-05-23  250  	/* Clear HSEIE so that faults do not get signaled */
12de0a35c996c3 drivers/usb/host/xhci.c     Marc Zyngier  2018-05-23  251  	val = readl(&xhci->op_regs->command);
12de0a35c996c3 drivers/usb/host/xhci.c     Marc Zyngier  2018-05-23  252  	val &= ~CMD_HSEIE;
12de0a35c996c3 drivers/usb/host/xhci.c     Marc Zyngier  2018-05-23  253  	writel(val, &xhci->op_regs->command);
12de0a35c996c3 drivers/usb/host/xhci.c     Marc Zyngier  2018-05-23  254  
12de0a35c996c3 drivers/usb/host/xhci.c     Marc Zyngier  2018-05-23  255  	/* Clear HSE (aka FATAL) */
12de0a35c996c3 drivers/usb/host/xhci.c     Marc Zyngier  2018-05-23  256  	val = readl(&xhci->op_regs->status);
12de0a35c996c3 drivers/usb/host/xhci.c     Marc Zyngier  2018-05-23  257  	val |= STS_FATAL;
12de0a35c996c3 drivers/usb/host/xhci.c     Marc Zyngier  2018-05-23  258  	writel(val, &xhci->op_regs->status);
12de0a35c996c3 drivers/usb/host/xhci.c     Marc Zyngier  2018-05-23  259  
12de0a35c996c3 drivers/usb/host/xhci.c     Marc Zyngier  2018-05-23  260  	/* Now zero the registers, and brace for impact */
12de0a35c996c3 drivers/usb/host/xhci.c     Marc Zyngier  2018-05-23  261  	val = xhci_read_64(xhci, &xhci->op_regs->dcbaa_ptr);
12de0a35c996c3 drivers/usb/host/xhci.c     Marc Zyngier  2018-05-23  262  	if (upper_32_bits(val))
12de0a35c996c3 drivers/usb/host/xhci.c     Marc Zyngier  2018-05-23  263  		xhci_write_64(xhci, 0, &xhci->op_regs->dcbaa_ptr);
12de0a35c996c3 drivers/usb/host/xhci.c     Marc Zyngier  2018-05-23  264  	val = xhci_read_64(xhci, &xhci->op_regs->cmd_ring);
12de0a35c996c3 drivers/usb/host/xhci.c     Marc Zyngier  2018-05-23  265  	if (upper_32_bits(val))
12de0a35c996c3 drivers/usb/host/xhci.c     Marc Zyngier  2018-05-23  266  		xhci_write_64(xhci, 0, &xhci->op_regs->cmd_ring);
12de0a35c996c3 drivers/usb/host/xhci.c     Marc Zyngier  2018-05-23  267  
286fd02fd54b6a drivers/usb/host/xhci.c     Mathias Nyman 2021-04-06  268  	intrs = min_t(u32, HCS_MAX_INTRS(xhci->hcs_params1),
286fd02fd54b6a drivers/usb/host/xhci.c     Mathias Nyman 2021-04-06  269  		      ARRAY_SIZE(xhci->run_regs->ir_set));
286fd02fd54b6a drivers/usb/host/xhci.c     Mathias Nyman 2021-04-06  270  
286fd02fd54b6a drivers/usb/host/xhci.c     Mathias Nyman 2021-04-06  271  	for (i = 0; i < intrs; i++) {
12de0a35c996c3 drivers/usb/host/xhci.c     Marc Zyngier  2018-05-23  272  		struct xhci_intr_reg __iomem *ir;
12de0a35c996c3 drivers/usb/host/xhci.c     Marc Zyngier  2018-05-23  273  
12de0a35c996c3 drivers/usb/host/xhci.c     Marc Zyngier  2018-05-23  274  		ir = &xhci->run_regs->ir_set[i];
12de0a35c996c3 drivers/usb/host/xhci.c     Marc Zyngier  2018-05-23  275  		val = xhci_read_64(xhci, &ir->erst_base);
12de0a35c996c3 drivers/usb/host/xhci.c     Marc Zyngier  2018-05-23  276  		if (upper_32_bits(val))
12de0a35c996c3 drivers/usb/host/xhci.c     Marc Zyngier  2018-05-23  277  			xhci_write_64(xhci, 0, &ir->erst_base);
12de0a35c996c3 drivers/usb/host/xhci.c     Marc Zyngier  2018-05-23  278  		val= xhci_read_64(xhci, &ir->erst_dequeue);
12de0a35c996c3 drivers/usb/host/xhci.c     Marc Zyngier  2018-05-23  279  		if (upper_32_bits(val))
12de0a35c996c3 drivers/usb/host/xhci.c     Marc Zyngier  2018-05-23  280  			xhci_write_64(xhci, 0, &ir->erst_dequeue);
12de0a35c996c3 drivers/usb/host/xhci.c     Marc Zyngier  2018-05-23  281  	}
12de0a35c996c3 drivers/usb/host/xhci.c     Marc Zyngier  2018-05-23  282  
12de0a35c996c3 drivers/usb/host/xhci.c     Marc Zyngier  2018-05-23  283  	/* Wait for the fault to appear. It will be cleared on reset */
12de0a35c996c3 drivers/usb/host/xhci.c     Marc Zyngier  2018-05-23  284  	err = xhci_handshake(&xhci->op_regs->status,
12de0a35c996c3 drivers/usb/host/xhci.c     Marc Zyngier  2018-05-23  285  			     STS_FATAL, STS_FATAL,
12de0a35c996c3 drivers/usb/host/xhci.c     Marc Zyngier  2018-05-23  286  			     XHCI_MAX_HALT_USEC);
12de0a35c996c3 drivers/usb/host/xhci.c     Marc Zyngier  2018-05-23  287  	if (!err)
12de0a35c996c3 drivers/usb/host/xhci.c     Marc Zyngier  2018-05-23  288  		xhci_info(xhci, "Fault detected\n");
12de0a35c996c3 drivers/usb/host/xhci.c     Marc Zyngier  2018-05-23  289  }
43b86af83da7db drivers/usb/host/xhci.c     Dong Nguyen   2010-07-21  290  

-- 
0-DAY CI Kernel Test Service
https://01.org/lkp

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