Re: Global lock for PCI configuration accesses

2015-09-10 Thread Thierry Reding
On Wed, Sep 09, 2015 at 12:27:38PM -0500, Bjorn Helgaas wrote: > Hi Thierry, > > On Wed, Sep 9, 2015 at 10:11 AM, Thierry Reding > wrote: > > Hi, > > > > There's currently an issue with PCI configuration space accesses on > > Tegra. The PCI host controller driver's ->map_bus() implementation > >

Re: Global lock for PCI configuration accesses

2015-09-09 Thread Bjorn Helgaas
Hi Thierry, On Wed, Sep 9, 2015 at 10:11 AM, Thierry Reding wrote: > Hi, > > There's currently an issue with PCI configuration space accesses on > Tegra. The PCI host controller driver's ->map_bus() implementation > remaps I/O memory on-demand to avoid potentially wasting 256 MiB of > virtual add

Global lock for PCI configuration accesses

2015-09-09 Thread Thierry Reding
Hi, There's currently an issue with PCI configuration space accesses on Tegra. The PCI host controller driver's ->map_bus() implementation remaps I/O memory on-demand to avoid potentially wasting 256 MiB of virtual address space. The reason why this is done is because the mapping isn't compatible