[+cc Martin (lspci maintainer)] On Wed, Dec 21, 2016 at 04:53:30PM +0000, Harry Mallon wrote: > Hello all, > > I am currently debugging a PCIE BAR assignment issue and am working on a patch to save me some time in future with lspci. Would patches like this be considered? Does anyone have any input on the proposed formats of the readouts? > > 1. Currently if a bridge has no memory behind bridge it displays messages like the following, for reasons of PCI implementation detail. > > I/O behind bridge: 0000f000-00000fff > Memory behind bridge: fff00000-000fffff > Prefetchable memory behind bridge: 00000000fff00000-00000000000fffff > > I would prefer: > I/O behind bridge: None > Memory behind bridge: None > Prefetchable memory behind bridge: None Thanks for the suggestions, Harry. I would like this, too. Maybe this with "-v": I/O behind bridge: None and this with "-vv": I/O behind bridge: None (0000f000-00000fff) There are many register values that disable the windows, and it's conceivable that somebody would want to match the actual register values with an analyzer trace or a piece of code. > 2. It would be useful for me to have access to the amount of memory in these chunks (my mental hex subtraction is pretty terrible). Maybe this would be displayed something like > > I/O behind bridge: 0000c000-0000dfff [8.00K] > Memory behind bridge: f4000000-f65fffff [38.00M] > Prefetchable memory behind bridge: 00000000e0000000-00000000f3ffffff [320.00M] This makes sense to me, too, though I would use the same size format lspci already uses for endpoint BARs, e.g., Memory at f1000000 (64-bit, non-prefetchable) [size=8K] Of course, BARs are always a nice power-of-two, so there's no need for fractions, while bridge window sizes are much less constrained. I don't know whether it's better to use decimal places as you did, or to use the largest unit size (K, M, G) that expresses the size as a whole number. Be sure to send any patches to Martin directly; I doubt he monitors linux-pci closely. Bjorn -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
