Messages in this thread | | | Date | Thu, 28 Apr 2005 09:11:17 -0600 | From | Grant Grundler <> | Subject | Re: pci-sysfs resource mmap broken (and PATCH) |
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On Wed, Apr 27, 2005 at 11:50:56PM -0700, David S. Miller wrote: > > Yes, and I think that pretty much match with PCI devices exposing a > > "prefetchable" BAR, don't you agree ? > > Some scsi controllers have prefetchable set in their normal > register BARs. The sym53c8xx does if I remember correctly.
None of the ones I have here seem to. Maybe someone else does?
grundler <504>lspci -vd 1000: 0000:00:01.0 SCSI storage controller: LSI Logic / Symbios Logic 53C896/897 (rev 07) Flags: bus master, medium devsel, latency 128, IRQ 18 I/O ports at 0100 [size=256] Memory at f8020000 (64-bit, non-prefetchable) [size=1K] Memory at f8040000 (64-bit, non-prefetchable) [size=8K] Capabilities: <available only to root>
0000:00:01.1 SCSI storage controller: LSI Logic / Symbios Logic 53C896/897 (rev 07) Flags: bus master, medium devsel, latency 128, IRQ 19 I/O ports at 0200 [size=256] Memory at f8007000 (64-bit, non-prefetchable) [size=1K] Memory at f8002000 (64-bit, non-prefetchable) [size=8K] Capabilities: <available only to root>
0000:00:02.0 SCSI storage controller: LSI Logic / Symbios Logic 53c875 (rev 14) Flags: bus master, medium devsel, latency 128, IRQ 19 I/O ports at 0300 [size=256] Memory at f8008000 (32-bit, non-prefetchable) [size=256] Memory at f8001000 (32-bit, non-prefetchable) [size=4K]
0000:00:02.1 SCSI storage controller: LSI Logic / Symbios Logic 53c875 (rev 14) Flags: bus master, medium devsel, latency 128, IRQ 20 I/O ports at 0400 [size=256] Memory at f8009000 (32-bit, non-prefetchable) [size=256] Memory at f8004000 (32-bit, non-prefetchable) [size=4K]
0000:20:00.0 SCSI storage controller: LSI Logic / Symbios Logic 53c1010 66MHz Ultra3 SCSI Adapter (rev 01) Subsystem: LSI Logic / Symbios Logic: Unknown device 1020 Flags: bus master, 66MHz, medium devsel, latency 128, IRQ 24 I/O ports at 20000 [size=256] Memory at fa044000 (64-bit, non-prefetchable) [size=1K] Memory at fa040000 (64-bit, non-prefetchable) [size=8K] Expansion ROM at fa000000 [disabled] [size=128K] Capabilities: <available only to root>
0000:20:00.1 SCSI storage controller: LSI Logic / Symbios Logic 53c1010 66MHz Ultra3 SCSI Adapter (rev 01) Subsystem: LSI Logic / Symbios Logic: Unknown device 1020 Flags: bus master, 66MHz, medium devsel, latency 128, IRQ 25 I/O ports at 20100 [size=256] Memory at fa045000 (64-bit, non-prefetchable) [size=1K] Memory at fa042000 (64-bit, non-prefetchable) [size=8K] Expansion ROM at fa020000 [disabled] [size=128K] Capabilities: <available only to root>
0000:30:02.0 SCSI storage controller: LSI Logic / Symbios Logic 53c1030 PCI-X Fusion-MPT Dual Ultra320 SCSI (rev 08) Subsystem: Hewlett-Packard Company: Unknown device 12c5 Flags: 66MHz, medium devsel, IRQ 27 I/O ports at 30000 [disabled] [size=256] Memory at fb200000 (64-bit, non-prefetchable) [disabled] [size=128K] Memory at fb220000 (64-bit, non-prefetchable) [disabled] [size=128K] Expansion ROM at fb000000 [disabled] [size=1M] Capabilities: <available only to root>
0000:30:02.1 SCSI storage controller: LSI Logic / Symbios Logic 53c1030 PCI-X Fusion-MPT Dual Ultra320 SCSI (rev 08) Subsystem: Hewlett-Packard Company: Unknown device 12c5 Flags: 66MHz, medium devsel, IRQ 28 I/O ports at 30100 [disabled] [size=256] Memory at fb240000 (64-bit, non-prefetchable) [disabled] [size=128K] Memory at fb260000 (64-bit, non-prefetchable) [disabled] [size=128K] Expansion ROM at fb100000 [disabled] [size=1M] Capabilities: <available only to root>
> Anyways, what I'm trying to say is that blinding turning prefetchable > BAR into "don't set side effect bit in PTE" might not be so wise. > > I really think it's a userlevel decision. That's where all the ioctl() > garbage came from for the /proc/bus/pci mmap() stuff. It was for chossing > IO vs MEM space, and also for setting these kinds of mapping attributes.
Well, if it's a device driver decision, I guess that's ok. And the primary device driver happens to live in user space in X.org case.
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