On Tue, Jul 05, 2022 at 06:50:39PM +0200, Christoph Hellwig wrote: > [note for the newcomers, this is about allowing mmap()ing the PCIe > P2P memory from the generic PCI P2P code through sysfs, and more > importantly how to revoke it on device removal] We allow mmap on PCIe config space today, right? Why is this different from what pci_create_legacy_files() does today? > On Tue, Jul 05, 2022 at 10:44:49AM -0600, Logan Gunthorpe wrote: > > We might be able to. I'm not sure. I'll have to figure out how to find > > that inode from the p2pdma code. I haven't found an obvious interface to > > do that. > > I think the right way to approach this would be a new sysfs API > that internally calls unmap_mapping_range internally instead of > exposing the inode. I suspect that might actually be the right thing > to do for iomem_inode as well. Why do we need something new and how is this any different from the PCI binary files I mention above? We have supported PCI hotplug for a very long time, do the current PCI binary sysfs files not work properly with mmap and removing a device? thanks, greg k-h
