Re: [Patch v2] Make PCI extended config space (MMCONFIG) a driver opt-in

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From: Tony Camuso
Date: Sunday, January 13, 2008 - 5:43 am

Arjan van de Ven wrote:

The PCI express spec requires the platform to provide access to this space
for express-compliance. More devices will be using this space as express
becomes the dominant IO bus technology.


There may have been devices that incorrectly applied the PCI spec to
various fields in the header, I'll grant you that.

However, there is no way a device can determine electrically whether the
Northbridge received Port IO or MMCONFIG cycles. This is between the CPU
and the Northbridge and is utterly opaque to the devices on the bus.


Which is why Loic's proposal and Ivan's implementation of it is so elegant.
It solves all these problems in one sweep, and eliminates the code rendered
cruft by Ivan's patch. A two-fer, by my reckoning.


The PCI spec provides for conf1 as an architected solution. It's not
going away, and especially not in x86 land where Port IO is built-in
to the CPU.



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Messages in current thread:
Re: [Patch v2] Make PCI extended config space (MMCONFIG) a ..., Arjan van de Ven, (Fri Jan 11, 12:09 pm)
Re: [Patch v2] Make PCI extended config space (MMCONFIG) a ..., Arjan van de Ven, (Fri Jan 11, 12:40 pm)
Re: [Patch v2] Make PCI extended config space (MMCONFIG) a ..., Arjan van de Ven, (Fri Jan 11, 12:54 pm)
Re: [Patch v2] Make PCI extended config space (MMCONFIG) a ..., Arjan van de Ven, (Sat Jan 12, 10:45 am)
Re: [Patch v2] Make PCI extended config space (MMCONFIG) a ..., Benjamin Herrenschmidt, (Sun Jan 13, 12:08 am)
Re: [Patch v2] Make PCI extended config space (MMCONFIG) a ..., Tony Camuso, (Sun Jan 13, 5:43 am)
Re: [Patch v2] Make PCI extended config space (MMCONFIG) a ..., Arjan van de Ven, (Sun Jan 13, 10:01 am)
Re: [Patch v2] Make PCI extended config space (MMCONFIG) a ..., Arjan van de Ven, (Sun Jan 13, 10:03 am)
Re: [Patch v2] Make PCI extended config space (MMCONFIG) a ..., Arjan van de Ven, (Sun Jan 13, 11:41 am)
Re: [Patch v2] Make PCI extended config space (MMCONFIG) a ..., Arjan van de Ven, (Sun Jan 13, 10:05 pm)
Re: [Patch v2] Make PCI extended config space (MMCONFIG) a ..., Øyvind Vågen Jægtnes, (Tue Jan 15, 5:58 am)
[PATCH] Change pci_raw_ops to pci_raw_read/write, Matthew Wilcox, (Mon Jan 28, 8:03 pm)
Re: [PATCH] Change pci_raw_ops to pci_raw_read/write, Yinghai Lu, (Sun Feb 3, 12:30 am)
Re: [PATCH] Change pci_raw_ops to pci_raw_read/write, Tony Camuso, (Thu Feb 7, 8:54 am)
Re: [PATCH] Change pci_raw_ops to pci_raw_read/write, Arjan van de Ven, (Thu Feb 7, 9:28 am)
Re: [PATCH] Change pci_raw_ops to pci_raw_read/write, Tony Camuso, (Thu Feb 7, 9:36 am)
Re: [PATCH] Change pci_raw_ops to pci_raw_read/write, Grant Grundler, (Thu Feb 7, 7:28 pm)
Re: [PATCH] Change pci_raw_ops to pci_raw_read/write, Matthew Wilcox, (Sat Feb 9, 5:41 am)
Re: [PATCH] Change pci_raw_ops to pci_raw_read/write, Yinghai Lu, (Sat Feb 9, 11:25 pm)
Re: [PATCH] Change pci_raw_ops to pci_raw_read/write, Matthew Wilcox, (Sun Feb 10, 7:51 am)
Re: [PATCH] Change pci_raw_ops to pci_raw_read/write, Grant Grundler, (Sun Feb 10, 12:13 pm)
Re: [PATCH] Change pci_raw_ops to pci_raw_read/write, Matthew Wilcox, (Sun Feb 10, 12:37 pm)
Re: [PATCH] Change pci_raw_ops to pci_raw_read/write, Yinghai Lu, (Sun Feb 10, 1:16 pm)
Re: [PATCH] Change pci_raw_ops to pci_raw_read/write, Matthew Wilcox, (Sun Feb 10, 1:19 pm)
Re: [PATCH] Change pci_raw_ops to pci_raw_read/write, Linus Torvalds, (Sun Feb 10, 1:24 pm)
Re: [PATCH] Change pci_raw_ops to pci_raw_read/write, Yinghai Lu, (Sun Feb 10, 1:25 pm)
Re: [PATCH] Change pci_raw_ops to pci_raw_read/write, Matthew Wilcox, (Sun Feb 10, 1:32 pm)
Re: [PATCH] Change pci_raw_ops to pci_raw_read/write, Matthew Wilcox, (Sun Feb 10, 1:45 pm)
Re: [PATCH] Change pci_raw_ops to pci_raw_read/write, Yinghai Lu, (Sun Feb 10, 1:47 pm)
raw_pci_read in quirk_intel_irqbalance, Matthew Wilcox, (Sun Feb 10, 4:02 pm)
Re: [PATCH] Change pci_raw_ops to pci_raw_read/write, Yinghai Lu, (Sun Feb 10, 6:49 pm)
Re: [PATCH] Change pci_raw_ops to pci_raw_read/write, Robert Hancock, (Sun Feb 10, 7:53 pm)
Re: raw_pci_read in quirk_intel_irqbalance, Matthew Wilcox, (Sun Feb 10, 10:04 pm)
Re: [PATCH] Change pci_raw_ops to pci_raw_read/write, Yinghai Lu, (Sun Feb 10, 10:59 pm)
Re: raw_pci_read in quirk_intel_irqbalance, Grant Grundler, (Mon Feb 11, 12:49 am)
Re: raw_pci_read in quirk_intel_irqbalance, Matthew Wilcox, (Mon Feb 11, 9:15 am)
Re: raw_pci_read in quirk_intel_irqbalance, Linus Torvalds, (Mon Feb 11, 10:18 am)
Re: raw_pci_read in quirk_intel_irqbalance, Grant Grundler, (Mon Feb 11, 12:38 pm)
Re: [PATCH] Change pci_raw_ops to pci_raw_read/write, Andrew Morton, (Mon Feb 11, 3:10 pm)
Re: [PATCH] Change pci_raw_ops to pci_raw_read/write, Ingo Molnar, (Mon Feb 11, 3:38 pm)