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* genirq: MSI: Fix freeing of unallocated MSIMarc Zyngier2015-04-081-2/+9
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | While debugging an unrelated issue with the GICv3 ITS driver, the following trace triggered: WARNING: CPU: 1 PID: 1 at kernel/irq/irqdomain.c:1121 irq_domain_free_irqs+0x160/0x17c() NULL pointer, cannot free irq Modules linked in: CPU: 1 PID: 1 Comm: swapper/0 Tainted: G W 3.19.0-rc6+ #3690 Hardware name: FVP Base (DT) Call trace: [<ffffffc000089398>] dump_backtrace+0x0/0x13c [<ffffffc0000894e4>] show_stack+0x10/0x1c [<ffffffc00066d134>] dump_stack+0x74/0x94 [<ffffffc0000a92f8>] warn_slowpath_common+0x9c/0xd4 [<ffffffc0000a938c>] warn_slowpath_fmt+0x5c/0x80 [<ffffffc0000ee04c>] irq_domain_free_irqs+0x15c/0x17c [<ffffffc0000ef918>] msi_domain_free_irqs+0x58/0x74 [<ffffffc000386f58>] free_msi_irqs+0xb4/0x1c0 // The msi_prepare callback fails here [<ffffffc0003872c0>] pci_enable_msix+0x25c/0x3d4 [<ffffffc00038746c>] pci_enable_msix_range+0x34/0x80 [<ffffffc0003924ac>] vp_try_to_find_vqs+0xec/0x528 [<ffffffc000392954>] vp_find_vqs+0x6c/0xa8 [<ffffffc0003ee2a8>] init_vq+0x120/0x248 [<ffffffc0003eefb0>] virtblk_probe+0xb0/0x6bc [<ffffffc00038fc34>] virtio_dev_probe+0x17c/0x214 [<ffffffc0003d4a04>] driver_probe_device+0x7c/0x23c [<ffffffc0003d4cb0>] __driver_attach+0x98/0xa0 [<ffffffc0003d2c60>] bus_for_each_dev+0x60/0xb4 [<ffffffc0003d455c>] driver_attach+0x1c/0x28 [<ffffffc0003d41b0>] bus_add_driver+0x150/0x208 [<ffffffc0003d54c0>] driver_register+0x64/0x130 [<ffffffc00038f9e8>] register_virtio_driver+0x24/0x68 [<ffffffc00091320c>] init+0x70/0xac [<ffffffc0000828f0>] do_one_initcall+0x94/0x1d0 [<ffffffc0008e9b00>] kernel_init_freeable+0x144/0x1e4 [<ffffffc00066a434>] kernel_init+0xc/0xd8 ---[ end trace f9ee562a77cc7bae ]--- The ITS msi_prepare callback having failed, we end-up trying to free MSIs that have never been allocated. Oddly enough, the kernel is pretty upset about it. It turns out that this behaviour was expected before the MSI domain was introduced (and dealt with in arch_teardown_msi_irqs). The obvious fix is to detect this early enough and bail out. Signed-off-by: Marc Zyngier <marc.zyngier@arm.com> Reviewed-by: Jiang Liu <jiang.liu@linux.intel.com> Link: http://lkml.kernel.org/r/1422299419-6051-1-git-send-email-marc.zyngier@arm.com Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
* genirq: Move irq_chip_write_msi_msg() helper to coreThomas Gleixner2014-12-071-0/+6
| | | | | | | | | No point to expose this to the world. The only legitimate user is the core code. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: Jiang Liu <jiang.liu@linux.intel.com> Cc: Marc Zyngier <marc.zyngier@arm.com>
* PCI/MSI: Move cached entry functions to irq coreJiang Liu2014-11-231-0/+13
| | | | | | | | | Required to support non PCI based MSI. [ tglx: Extracted from Jiangs patch series ] Signed-off-by: Jiang Liu <jiang.liu@linux.intel.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
* genirq: Provide default callbacks for msi_domain_opsJiang Liu2014-11-231-8/+103
| | | | | | | | | | | | | | | | | | | Extend struct msi_domain_info and provide default callbacks for msi_domain_ops. Signed-off-by: Jiang Liu <jiang.liu@linux.intel.com> Cc: Tony Luck <tony.luck@intel.com> Cc: linux-arm-kernel@lists.infradead.org Cc: Bjorn Helgaas <bhelgaas@google.com> Cc: Grant Likely <grant.likely@linaro.org> Cc: Marc Zyngier <marc.zyngier@arm.com> Cc: Yijing Wang <wangyijing@huawei.com> Cc: Yingjoe Chen <yingjoe.chen@mediatek.com> Cc: Borislav Petkov <bp@alien8.de> Cc: Matthias Brugger <matthias.bgg@gmail.com> Cc: Alexander Gordeev <agordeev@redhat.com> Link: http://lkml.kernel.org/r/1416061447-9472-8-git-send-email-jiang.liu@linux.intel.com Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
* genirq: Introduce msi_domain_alloc/free_irqs()Jiang Liu2014-11-231-0/+75
| | | | | | | | | | | | | | | | | | | Introduce msi_domain_{alloc|free}_irqs() to alloc/free interrupts from generic MSI irqdomain. Signed-off-by: Jiang Liu <jiang.liu@linux.intel.com> Cc: Tony Luck <tony.luck@intel.com> Cc: linux-arm-kernel@lists.infradead.org Cc: Bjorn Helgaas <bhelgaas@google.com> Cc: Grant Likely <grant.likely@linaro.org> Cc: Marc Zyngier <marc.zyngier@arm.com> Cc: Yijing Wang <wangyijing@huawei.com> Cc: Yingjoe Chen <yingjoe.chen@mediatek.com> Cc: Borislav Petkov <bp@alien8.de> Cc: Matthias Brugger <matthias.bgg@gmail.com> Cc: Alexander Gordeev <agordeev@redhat.com> Link: http://lkml.kernel.org/r/1416061447-9472-7-git-send-email-jiang.liu@linux.intel.com Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
* genirq: Add generic msi irq domain supportJiang Liu2014-11-231-0/+141
Implement the basic functions for MSI interrupt support with hierarchical interrupt domains. [ tglx: Extracted and combined from several patches ] Signed-off-by: Jiang Liu <jiang.liu@linux.intel.com> Cc: Bjorn Helgaas <bhelgaas@google.com> Cc: Grant Likely <grant.likely@linaro.org> Cc: Marc Zyngier <marc.zyngier@arm.com> Cc: Yingjoe Chen <yingjoe.chen@mediatek.com> Cc: Yijing Wang <wangyijing@huawei.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
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