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pci_fixup_irqs() usage Message-ID: <20170621103042.GA1712@red-moon> References: <20170608141342.2018-1-lorenzo.pieralisi@arm.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.21 (2010-09-15) X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20170621_032941_138224_DC5BAE11 X-CRM114-Status: GOOD ( 20.70 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Gabriele Paoloni , linux-pci , Shawn Lin , Will Deacon , Michal Simek , Thierry Reding , Tanmay Inamdar , Matthew Minter , Rob Herring , Joao Pinto , Pratyush Anand , Russell King , Murali Karicheri , Arnd Bergmann , Bharat Kumar Gogada , Simon Horman , Bjorn Helgaas , Mingkai Hu , "linux-arm-kernel@lists.infradead.org" , Thomas Petazzoni , Jingoo Han , Stanimir Varbanov , Minghuan Lian , Zhou Wang , Roy Zang Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Virus-Scanned: ClamAV using ClamSMTP On Wed, Jun 21, 2017 at 10:39:31AM +0200, Linus Walleij wrote: > On Thu, Jun 8, 2017 at 4:13 PM, Lorenzo Pieralisi > wrote: > > I pulled this into the Gemini tree: > > [1] git://git.kernel.org/pub/scm/linux/kernel/git/lpieralisi/linux.git pci/pci-fixup-irqs-removal-v2 > > And then this happens: > > OF: PCI: host bridge /soc/pci@50000000 ranges: > OF: PCI: IO 0x50000000..0x500fffff -> 0x00000000 > OF: PCI: MEM 0x58000000..0x5fffffff -> 0x58000000 > Unable to handle kernel NULL pointer dereference at virtual address 00000070 > pgd = c0004000 > [00000070] *pgd=00000000 > Internal error: Oops: 17 [#1] PREEMPT ARM > CPU: 0 PID: 254 Comm: kworker/0:1 Not tainted 4.12.0-rc3+ #888 > Hardware name: Gemini (Device Tree) > Workqueue: events deferred_probe_work_func > task: c38c3a40 task.stack: c390a000 > PC is at faraday_pci_probe+0x274/0x65c > LR is at __irq_put_desc_unlock+0x18/0x70 > pc : [] lr : [] psr: 80000013 > sp : c390bdf0 ip : c3424274 fp : c3ac2ee0 > r10: c3f77718 r9 : c3ad49b0 r8 : c3907800 > r7 : 00000004 r6 : c390be18 r5 : c3907810 r4 : c3ad4810 > r3 : 00000000 r2 : 00000000 r1 : 00000001 r0 : c3ac2de0 > Flags: Nzcv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none > Control: 0000397f Table: 03a9c000 DAC: 00000053 > Process kworker/0:1 (pid: 254, stack limit = 0xc390a190) > Stack: (0xc390bdf0 to 0xc390c000) > bde0: c0534a60 c3ad49b0 00000003 c024cb68 > be00: 00000001 20000013 00000000 50000000 00000007 000020dd c3ae2680 c3ae2740 > be20: c07c861f c0134328 00000000 c3ad5fa0 c3910a50 c3910a50 00000001 00000000 > be40: 00000000 c01344ec c3910a50 c3910a50 00000001 00000000 c3910a50 c39d76e0 > be60: c3ad5fa0 c05f6f58 c3910a50 c3907810 c3907810 c07cba88 fffffdfb 00000003 > be80: 00000000 c07c5040 c386e420 c02bbbe0 c3907810 c081c6c4 00000000 c07cba88 > bea0: 00000003 c02ba9dc 00000000 c390bee0 c02bab30 00000001 c07bf660 00000000 > bec0: c07c5040 c02b93dc c382829c c39886f4 c3907810 c3907844 c3907810 c02ba674 > bee0: c3907810 00000001 c390bf0c c3907810 c07d3a80 c3907810 c07d38e4 c02b961c > bf00: c3907810 c07d38d0 c07d38d0 c02ba210 c07d38ec c386e420 00000000 c3f6b100 > bf20: c07bf660 c002dac0 00000008 c07bf660 c07bf660 c386e438 c390a000 c07bf674 > bf40: 00000008 c07bf660 c07c5040 c002e044 c390a000 00000001 00000000 00000000 > bf60: c3901518 c3901500 ffffe000 c38e2700 00000000 c3901518 c386e420 c002ddb4 > bf80: c3839ee4 c00335ec c390a000 c38e2700 c003350c 00000000 00000000 00000000 > bfa0: 00000000 00000000 00000000 c000a270 00000000 00000000 00000000 00000000 > bfc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 > bfe0: 00000000 00000000 00000000 00000000 00000013 00000000 ffffffff ffffffff > [] (faraday_pci_probe) from [] > (platform_drv_probe+0x50/0xb4) > [] (platform_drv_probe) from [] > (driver_probe_device+0x248/0x2dc) > [] (driver_probe_device) from [] > (bus_for_each_drv+0x68/0x98) > [] (bus_for_each_drv) from [] (__device_attach+0xa8/0x110) > [] (__device_attach) from [] (bus_probe_device+0x88/0x90) > [] (bus_probe_device) from [] > (deferred_probe_work_func+0x54/0x80) > [] (deferred_probe_work_func) from [] > (process_one_work+0x13c/0x430) > [] (process_one_work) from [] (worker_thread+0x290/0x5f4) > [] (worker_thread) from [] (kthread+0xe0/0x120) > [] (kthread) from [] (ret_from_fork+0x14/0x24) > Code: e59401b0 e3700a01 8a00001d e59421ac (e5d23070) > ---[ end trace 1e313b1ea11e101c ]--- > > I'm trying to figure out what is causing it. Mind trying this patch please on top of my branch (compile tested, that's all I can do) -- >8 -- diff --git a/drivers/pci/host/pci-ftpci100.c b/drivers/pci/host/pci-ftpci100.c index 9cfc90a..316ee50 100644 --- a/drivers/pci/host/pci-ftpci100.c +++ b/drivers/pci/host/pci-ftpci100.c @@ -178,12 +178,11 @@ static int faraday_res_to_memcfg(resource_size_t mem_base, return 0; } -static int faraday_pci_read_config(struct pci_bus *bus, unsigned int fn, - int config, int size, u32 *value) +static int faraday_raw_pci_read_config(struct faraday_pci *p, int bus_number, + unsigned int fn, int config, int size, + u32 *value) { - struct faraday_pci *p = bus->sysdata; - - writel(PCI_CONF_BUS(bus->number) | + writel(PCI_CONF_BUS(bus_number) | PCI_CONF_DEVICE(PCI_SLOT(fn)) | PCI_CONF_FUNCTION(PCI_FUNC(fn)) | PCI_CONF_WHERE(config) | @@ -197,11 +196,19 @@ static int faraday_pci_read_config(struct pci_bus *bus, unsigned int fn, else if (size == 2) *value = (*value >> (8 * (config & 3))) & 0xFFFF; + return PCIBIOS_SUCCESSFUL; +} + +static int faraday_pci_read_config(struct pci_bus *bus, unsigned int fn, + int config, int size, u32 *value) +{ + struct faraday_pci *p = bus->sysdata; + dev_dbg(&bus->dev, "[read] slt: %.2d, fnc: %d, cnf: 0x%.2X, val (%d bytes): 0x%.8X\n", PCI_SLOT(fn), PCI_FUNC(fn), config, size, *value); - return PCIBIOS_SUCCESSFUL; + return faraday_raw_pci_read_config(p, bus->number, fn, config, size, value); } static int faraday_raw_pci_write_config(struct faraday_pci *p, int bus_number, @@ -257,10 +264,10 @@ static void faraday_pci_ack_irq(struct irq_data *d) struct faraday_pci *p = irq_data_get_irq_chip_data(d); unsigned int reg; - faraday_pci_read_config(p->bus, 0, FARADAY_PCI_CTRL2, 4, ®); + faraday_raw_pci_read_config(p, 0, 0, FARADAY_PCI_CTRL2, 4, ®); reg &= ~(0xF << PCI_CTRL2_INTSTS_SHIFT); reg |= BIT(irqd_to_hwirq(d) + PCI_CTRL2_INTSTS_SHIFT); - faraday_pci_write_config(p->bus, 0, FARADAY_PCI_CTRL2, 4, reg); + faraday_raw_pci_write_config(p, 0, 0, FARADAY_PCI_CTRL2, 4, reg); } static void faraday_pci_mask_irq(struct irq_data *d) @@ -268,10 +275,10 @@ static void faraday_pci_mask_irq(struct irq_data *d) struct faraday_pci *p = irq_data_get_irq_chip_data(d); unsigned int reg; - faraday_pci_read_config(p->bus, 0, FARADAY_PCI_CTRL2, 4, ®); + faraday_raw_pci_read_config(p, 0, 0, FARADAY_PCI_CTRL2, 4, ®); reg &= ~((0xF << PCI_CTRL2_INTSTS_SHIFT) | BIT(irqd_to_hwirq(d) + PCI_CTRL2_INTMASK_SHIFT)); - faraday_pci_write_config(p->bus, 0, FARADAY_PCI_CTRL2, 4, reg); + faraday_raw_pci_write_config(p, 0, 0, FARADAY_PCI_CTRL2, 4, reg); } static void faraday_pci_unmask_irq(struct irq_data *d) @@ -279,10 +286,10 @@ static void faraday_pci_unmask_irq(struct irq_data *d) struct faraday_pci *p = irq_data_get_irq_chip_data(d); unsigned int reg; - faraday_pci_read_config(p->bus, 0, FARADAY_PCI_CTRL2, 4, ®); + faraday_raw_pci_read_config(p, 0, 0, FARADAY_PCI_CTRL2, 4, ®); reg &= ~(0xF << PCI_CTRL2_INTSTS_SHIFT); reg |= BIT(irqd_to_hwirq(d) + PCI_CTRL2_INTMASK_SHIFT); - faraday_pci_write_config(p->bus, 0, FARADAY_PCI_CTRL2, 4, reg); + faraday_raw_pci_write_config(p, 0, 0, FARADAY_PCI_CTRL2, 4, reg); } static void faraday_pci_irq_handler(struct irq_desc *desc) @@ -291,7 +298,7 @@ static void faraday_pci_irq_handler(struct irq_desc *desc) struct irq_chip *irqchip = irq_desc_get_chip(desc); unsigned int irq_stat, reg, i; - faraday_pci_read_config(p->bus, 0, FARADAY_PCI_CTRL2, 4, ®); + faraday_raw_pci_read_config(p, 0, 0, FARADAY_PCI_CTRL2, 4, ®); irq_stat = reg >> PCI_CTRL2_INTSTS_SHIFT; chained_irq_enter(irqchip, desc);