On 01/04/2017 02:32 PM, Murali Karicheri wrote:
> Recent fixes for iATU unroll support introduced a bug that causes
> asynchronous external abort in Keystone PCIe h/w which doesn't have
> ATU port and the corresponding register. So the check should be moved
> below where dw_pcie_prog_outbound_atu() is called to avoid that
> being called on keystine PCIe h/w.
>
> Here is the backtrace
>
> [ 0.771174] OF: PCI: MEM 0x60000000..0x6fffffff -> 0x60000000
> [ 0.778118] Unhandled fault: asynchronous external abort (0x1211) at 0x00000000
> [ 0.785548] pgd = c0003000
> [ 0.788347] [00000000] *pgd=80000800004003, *pmd=00000000
> [ 0.793864] Internal error: : 1211 [#1] PREEMPT SMP ARM
> [ 0.799197] Modules linked in:
> [ 0.802351] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 4.9.0-00009-g6ff59d2-dirty #7
> [ 0.810130] Hardware name: Keystone
> [ 0.813717] task: eb878000 task.stack: eb866000
> [ 0.818356] PC is at dw_pcie_setup_rc+0x24/0x380
> [ 0.823083] LR is at ks_pcie_host_init+0x10/0x170
>
> Fixes: 416379f9ebde ("PCI: designware: Check for iATU unroll support after initializing host")
> Signed-off-by: Murali Karicheri <m-karicheri2@xxxxxx>
> Tested-by: Kishon Vijay Abraham I <kishon@xxxxxx>
> ---
> - Applies to pci/master
> - Bug was introduced in v4.9
> - Tested on K2E EVM with SATA and DRA7-EVM with an intel PCI ethernet card
>
> drivers/pci/host/pcie-designware.c | 10 +++++-----
> 1 file changed, 5 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/pci/host/pcie-designware.c b/drivers/pci/host/pcie-designware.c
> index bed1999..af8f6e9 100644
> --- a/drivers/pci/host/pcie-designware.c
> +++ b/drivers/pci/host/pcie-designware.c
> @@ -807,11 +807,6 @@ void dw_pcie_setup_rc(struct pcie_port *pp)
> {
> u32 val;
>
> - /* get iATU unroll support */
> - pp->iatu_unroll_enabled = dw_pcie_iatu_unroll_enabled(pp);
> - dev_dbg(pp->dev, "iATU unroll: %s\n",
> - pp->iatu_unroll_enabled ? "enabled" : "disabled");
> -
> /* set the number of lanes */
> val = dw_pcie_readl_rc(pp, PCIE_PORT_LINK_CONTROL);
> val &= ~PORT_LINK_MODE_MASK;
> @@ -882,6 +877,11 @@ void dw_pcie_setup_rc(struct pcie_port *pp)
> * we should not program the ATU here.
> */
> if (!pp->ops->rd_other_conf) {
> + /* get iATU unroll support */
> + pp->iatu_unroll_enabled = dw_pcie_iatu_unroll_enabled(pp);
> + dev_dbg(pp->dev, "iATU unroll: %s\n",
> + pp->iatu_unroll_enabled ? "enabled" : "disabled");
> +
> dw_pcie_prog_outbound_atu(pp, PCIE_ATU_REGION_INDEX0,
> PCIE_ATU_TYPE_MEM, pp->mem_base,
> pp->mem_bus_addr, pp->mem_size);
>
Bjorn,
A Gentle ping to merge this important fix to v4.10-rc kernel for Keystone PCI as
it is broken since v4.9.
Thanks
--
Murali Karicheri
Linux Kernel, Keystone
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