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Message-ID: <870f833b-6bff-b3b1-6591-7d46e374de66@sigmadesigns.com>
Date: Wed, 14 Jun 2017 11:19:04 +0200
From: Marc Gonzalez <marc_gonzalez@...madesigns.com>
To: Marc Zyngier <marc.zyngier@....com>,
Thomas Gleixner <tglx@...utronix.de>
CC: Bjorn Helgaas <helgaas@...nel.org>,
Robin Murphy <robin.murphy@....com>,
Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
Liviu Dudau <liviu.dudau@....com>,
David Laight <david.laight@...lab.com>,
linux-pci <linux-pci@...r.kernel.org>,
Linux ARM <linux-arm-kernel@...ts.infradead.org>,
LKML <linux-kernel@...r.kernel.org>, Mason <slash.tmp@...e.fr>
Subject: Re: [PATCH v7 3/3] PCI: Add tango MSI controller support
On 14/06/2017 11:00, Marc Gonzalez wrote:
> The MSI controller in Tango supports 256 message-signaled interrupts,
> and a single doorbell address.
>
> Signed-off-by: Marc Gonzalez <marc_gonzalez@...madesigns.com>
> ---
> Changes from v6 to v7
> o Call spin_lock() not spin_lock_irqsave() in the ISR
> ---
> drivers/pci/host/pcie-tango.c | 225 ++++++++++++++++++++++++++++++++++++++++++
> 1 file changed, 225 insertions(+)
Someone on IRC suggested testing the driver with LOCKDEP.
If I understand the warning below correctly, I am not supposed
to call irq_domain_set_info() while holding used_msi_lock?
NB: in probe, my driver calls
add_taint(TAINT_FIRMWARE_WORKAROUND, LOCKDEP_STILL_OK);
This should not break LOCKDEP analysis, right?
Regards.
[ 0.685615] ======================================================
[ 0.685621] [ INFO: possible circular locking dependency detected ]
[ 0.685632] 4.9.20-1-rc3 #2 Tainted: G I
[ 0.685638] -------------------------------------------------------
[ 0.685644] swapper/0/1 is trying to acquire lock:
[ 0.685650] (&(&pcie->used_msi_lock)->rlock){......}, at: [<c0352e5c>] update_msi_enable+0x2c/0x58
[ 0.685692] but task is already holding lock:
[ 0.685698] (&irq_desc_lock_class){......}, at: [<c017586c>] __setup_irq+0xa4/0x5f0
[ 0.685718] which lock already depends on the new lock.
[ 0.685718]
[ 0.685725]
[ 0.685725] the existing dependency chain (in reverse order) is:
[ 0.685731]
[ 0.685731] -> #1 (&irq_desc_lock_class){......}:
[ 0.685758] __irq_get_desc_lock+0x54/0x94
[ 0.685768] __irq_set_handler+0x24/0x54
[ 0.685778] irq_domain_set_info+0x38/0x4c
[ 0.685786] tango_irq_domain_alloc+0x98/0xbc
[ 0.685795] msi_domain_alloc+0x68/0x130
[ 0.685802] __irq_domain_alloc_irqs+0x11c/0x2ac
[ 0.685809] msi_domain_alloc_irqs+0x78/0x188
[ 0.685816] __pci_enable_msi_range+0x200/0x37c
[ 0.685824] pcie_port_device_register+0x3cc/0x494
[ 0.685831] pcie_portdrv_probe+0x2c/0xa4
[ 0.685844] pci_device_probe+0x8c/0xe8
[ 0.685852] driver_probe_device+0x1c8/0x2ac
[ 0.685863] bus_for_each_drv+0x60/0x94
[ 0.685870] __device_attach+0xb4/0x118
[ 0.685883] pci_bus_add_device+0x44/0x90
[ 0.685891] pci_bus_add_devices+0x3c/0x80
[ 0.685898] pci_host_common_probe+0x100/0x314
[ 0.685906] platform_drv_probe+0x50/0xb0
[ 0.685912] driver_probe_device+0x21c/0x2ac
[ 0.685918] __driver_attach+0xc0/0xc4
[ 0.685926] bus_for_each_dev+0x68/0x9c
[ 0.685933] bus_add_driver+0x108/0x214
[ 0.685939] driver_register+0x78/0xf4
[ 0.685947] do_one_initcall+0x44/0x174
[ 0.685961] kernel_init_freeable+0x158/0x1e8
[ 0.685971] kernel_init+0x8/0x10c
[ 0.685980] ret_from_fork+0x14/0x24
[ 0.685985]
[ 0.685985] -> #0 (&(&pcie->used_msi_lock)->rlock){......}:
[ 0.686003] _raw_spin_lock_irqsave+0x44/0x58
[ 0.686012] update_msi_enable+0x2c/0x58
[ 0.686019] irq_enable+0x30/0x44
[ 0.686025] irq_startup+0x80/0x84
[ 0.686031] __setup_irq+0x558/0x5f0
[ 0.686038] request_threaded_irq+0xe4/0x184
[ 0.686044] pcie_pme_probe+0xc4/0x1f0
[ 0.686051] pcie_port_probe_service+0x34/0x70
[ 0.686057] driver_probe_device+0x21c/0x2ac
[ 0.686065] bus_for_each_drv+0x60/0x94
[ 0.686071] __device_attach+0xb4/0x118
[ 0.686079] bus_probe_device+0x88/0x90
[ 0.686085] device_add+0x3f4/0x584
[ 0.686092] pcie_port_device_register+0x228/0x494
[ 0.686099] pcie_portdrv_probe+0x2c/0xa4
[ 0.686106] pci_device_probe+0x8c/0xe8
[ 0.686113] driver_probe_device+0x1c8/0x2ac
[ 0.686120] bus_for_each_drv+0x60/0x94
[ 0.686126] __device_attach+0xb4/0x118
[ 0.686134] pci_bus_add_device+0x44/0x90
[ 0.686141] pci_bus_add_devices+0x3c/0x80
[ 0.686149] pci_host_common_probe+0x100/0x314
[ 0.686155] platform_drv_probe+0x50/0xb0
[ 0.686161] driver_probe_device+0x21c/0x2ac
[ 0.686167] __driver_attach+0xc0/0xc4
[ 0.686175] bus_for_each_dev+0x68/0x9c
[ 0.686182] bus_add_driver+0x108/0x214
[ 0.686188] driver_register+0x78/0xf4
[ 0.686194] do_one_initcall+0x44/0x174
[ 0.686203] kernel_init_freeable+0x158/0x1e8
[ 0.686210] kernel_init+0x8/0x10c
[ 0.686218] ret_from_fork+0x14/0x24
[ 0.686222]
[ 0.686222] other info that might help us debug this:
[ 0.686222]
[ 0.686229] Possible unsafe locking scenario:
[ 0.686229]
[ 0.686235] CPU0 CPU1
[ 0.686239] ---- ----
[ 0.686243] lock(&irq_desc_lock_class);
[ 0.686251] lock(&(&pcie->used_msi_lock)->rlock);
[ 0.686260] lock(&irq_desc_lock_class);
[ 0.686267] lock(&(&pcie->used_msi_lock)->rlock);
[ 0.686275]
[ 0.686275] *** DEADLOCK ***
[ 0.686275]
[ 0.686283] 5 locks held by swapper/0/1:
[ 0.686288] #0: (&dev->mutex){......}, at: [<c03939e4>] __driver_attach+0x50/0xc4
[ 0.686303] #1: (&dev->mutex){......}, at: [<c03939f4>] __driver_attach+0x60/0xc4
[ 0.686318] #2: (&dev->mutex){......}, at: [<c0393574>] __device_attach+0x20/0x118
[ 0.686333] #3: (&dev->mutex){......}, at: [<c0393574>] __device_attach+0x20/0x118
[ 0.686348] #4: (&irq_desc_lock_class){......}, at: [<c017586c>] __setup_irq+0xa4/0x5f0
[ 0.686363]
[ 0.686363] stack backtrace:
[ 0.686373] CPU: 0 PID: 1 Comm: swapper/0 Tainted: G I 4.9.20-1-rc3 #2
[ 0.686379] Hardware name: Sigma Tango DT
[ 0.686398] [<c010f8a0>] (unwind_backtrace) from [<c010b540>] (show_stack+0x10/0x14)
[ 0.686411] [<c010b540>] (show_stack) from [<c0309f40>] (dump_stack+0x98/0xc4)
[ 0.686423] [<c0309f40>] (dump_stack) from [<c0165ce4>] (print_circular_bug+0x214/0x334)
[ 0.686432] [<c0165ce4>] (print_circular_bug) from [<c016934c>] (__lock_acquire+0x171c/0x1a28)
[ 0.686441] [<c016934c>] (__lock_acquire) from [<c0169a28>] (lock_acquire+0x6c/0x88)
[ 0.686452] [<c0169a28>] (lock_acquire) from [<c0533004>] (_raw_spin_lock_irqsave+0x44/0x58)
[ 0.686464] [<c0533004>] (_raw_spin_lock_irqsave) from [<c0352e5c>] (update_msi_enable+0x2c/0x58)
[ 0.686475] [<c0352e5c>] (update_msi_enable) from [<c0177614>] (irq_enable+0x30/0x44)
[ 0.686484] [<c0177614>] (irq_enable) from [<c01776a8>] (irq_startup+0x80/0x84)
[ 0.686493] [<c01776a8>] (irq_startup) from [<c0175d20>] (__setup_irq+0x558/0x5f0)
[ 0.686502] [<c0175d20>] (__setup_irq) from [<c0175f60>] (request_threaded_irq+0xe4/0x184)
[ 0.686511] [<c0175f60>] (request_threaded_irq) from [<c034fed0>] (pcie_pme_probe+0xc4/0x1f0)
[ 0.686520] [<c034fed0>] (pcie_pme_probe) from [<c034d8a8>] (pcie_port_probe_service+0x34/0x70)
[ 0.686530] [<c034d8a8>] (pcie_port_probe_service) from [<c0393904>] (driver_probe_device+0x21c/0x2ac)
[ 0.686540] [<c0393904>] (driver_probe_device) from [<c0391d18>] (bus_for_each_drv+0x60/0x94)
[ 0.686550] [<c0391d18>] (bus_for_each_drv) from [<c0393608>] (__device_attach+0xb4/0x118)
[ 0.686560] [<c0393608>] (__device_attach) from [<c0392b14>] (bus_probe_device+0x88/0x90)
[ 0.686570] [<c0392b14>] (bus_probe_device) from [<c0390ef0>] (device_add+0x3f4/0x584)
[ 0.686580] [<c0390ef0>] (device_add) from [<c034dba4>] (pcie_port_device_register+0x228/0x494)
[ 0.686589] [<c034dba4>] (pcie_port_device_register) from [<c034e26c>] (pcie_portdrv_probe+0x2c/0xa4)
[ 0.686600] [<c034e26c>] (pcie_portdrv_probe) from [<c0341ff0>] (pci_device_probe+0x8c/0xe8)
[ 0.686611] [<c0341ff0>] (pci_device_probe) from [<c03938b0>] (driver_probe_device+0x1c8/0x2ac)
[ 0.686620] [<c03938b0>] (driver_probe_device) from [<c0391d18>] (bus_for_each_drv+0x60/0x94)
[ 0.686630] [<c0391d18>] (bus_for_each_drv) from [<c0393608>] (__device_attach+0xb4/0x118)
[ 0.686641] [<c0393608>] (__device_attach) from [<c03381fc>] (pci_bus_add_device+0x44/0x90)
[ 0.686651] [<c03381fc>] (pci_bus_add_device) from [<c0338284>] (pci_bus_add_devices+0x3c/0x80)
[ 0.686662] [<c0338284>] (pci_bus_add_devices) from [<c0352bf4>] (pci_host_common_probe+0x100/0x314)
[ 0.686673] [<c0352bf4>] (pci_host_common_probe) from [<c03950dc>] (platform_drv_probe+0x50/0xb0)
[ 0.686682] [<c03950dc>] (platform_drv_probe) from [<c0393904>] (driver_probe_device+0x21c/0x2ac)
[ 0.686690] [<c0393904>] (driver_probe_device) from [<c0393a54>] (__driver_attach+0xc0/0xc4)
[ 0.686700] [<c0393a54>] (__driver_attach) from [<c0391c70>] (bus_for_each_dev+0x68/0x9c)
[ 0.686711] [<c0391c70>] (bus_for_each_dev) from [<c0392d2c>] (bus_add_driver+0x108/0x214)
[ 0.686721] [<c0392d2c>] (bus_add_driver) from [<c0394170>] (driver_register+0x78/0xf4)
[ 0.686730] [<c0394170>] (driver_register) from [<c01017dc>] (do_one_initcall+0x44/0x174)
[ 0.686742] [<c01017dc>] (do_one_initcall) from [<c0800dc0>] (kernel_init_freeable+0x158/0x1e8)
[ 0.686754] [<c0800dc0>] (kernel_init_freeable) from [<c052c918>] (kernel_init+0x8/0x10c)
[ 0.686765] [<c052c918>] (kernel_init) from [<c01077d0>] (ret_from_fork+0x14/0x24)
[ 0.686824] pcieport 0000:00:00.0: Signaling PME through PCIe PME interrupt
[ 0.686835] pci 0000:01:00.0: Signaling PME through PCIe PME interrupt
[ 0.686849] pcie_pme 0000:00:00.0:pcie001: service driver pcie_pme loaded
[ 0.687049] aer 0000:00:00.0:pcie002: service driver aer loaded
[ 0.687276] pci 0000:01:00.0: enabling device (0140 -> 0142)
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