diff options
63 files changed, 2101 insertions, 897 deletions
diff --git a/Documentation/pci.txt b/Documentation/pci.txt index 7754f5aea4e9..72b20c639596 100644 --- a/Documentation/pci.txt +++ b/Documentation/pci.txt | |||
| @@ -274,8 +274,6 @@ the PCI device by calling pci_enable_device(). This will: | |||
| 274 | o allocate an IRQ (if BIOS did not). | 274 | o allocate an IRQ (if BIOS did not). |
| 275 | 275 | ||
| 276 | NOTE: pci_enable_device() can fail! Check the return value. | 276 | NOTE: pci_enable_device() can fail! Check the return value. |
| 277 | NOTE2: Also see pci_enable_device_bars() below. Drivers can | ||
| 278 | attempt to enable only a subset of BARs they need. | ||
| 279 | 277 | ||
| 280 | [ OS BUG: we don't check resource allocations before enabling those | 278 | [ OS BUG: we don't check resource allocations before enabling those |
| 281 | resources. The sequence would make more sense if we called | 279 | resources. The sequence would make more sense if we called |
| @@ -605,40 +603,7 @@ device lists. This is still possible but discouraged. | |||
| 605 | 603 | ||
| 606 | 604 | ||
| 607 | 605 | ||
| 608 | 10. pci_enable_device_bars() and Legacy I/O Port space | 606 | 10. MMIO Space and "Write Posting" |
| 609 | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ | ||
| 610 | |||
| 611 | Large servers may not be able to provide I/O port resources to all PCI | ||
| 612 | devices. I/O Port space is only 64KB on Intel Architecture[1] and is | ||
| 613 | likely also fragmented since the I/O base register of PCI-to-PCI | ||
| 614 | bridge will usually be aligned to a 4KB boundary[2]. On such systems, | ||
| 615 | pci_enable_device() and pci_request_region() will fail when | ||
| 616 | attempting to enable I/O Port regions that don't have I/O Port | ||
| 617 | resources assigned. | ||
| 618 | |||
| 619 | Fortunately, many PCI devices which request I/O Port resources also | ||
| 620 | provide access to the same registers via MMIO BARs. These devices can | ||
| 621 | be handled without using I/O port space and the drivers typically | ||
| 622 | offer a CONFIG_ option to only use MMIO regions | ||
| 623 | (e.g. CONFIG_TULIP_MMIO). PCI devices typically provide I/O port | ||
| 624 | interface for legacy OSes and will work when I/O port resources are not | ||
| 625 | assigned. The "PCI Local Bus Specification Revision 3.0" discusses | ||
| 626 | this on p.44, "IMPLEMENTATION NOTE". | ||
| 627 | |||
| 628 | If your PCI device driver doesn't need I/O port resources assigned to | ||
| 629 | I/O Port BARs, you should use pci_enable_device_bars() instead of | ||
| 630 | pci_enable_device() in order not to enable I/O port regions for the | ||
| 631 | corresponding devices. In addition, you should use | ||
| 632 | pci_request_selected_regions() and pci_release_selected_regions() | ||
| 633 | instead of pci_request_regions()/pci_release_regions() in order not to | ||
| 634 | request/release I/O port regions for the corresponding devices. | ||
| 635 | |||
| 636 | [1] Some systems support 64KB I/O port space per PCI segment. | ||
| 637 | [2] Some PCI-to-PCI bridges support optional 1KB aligned I/O base. | ||
| 638 | |||
| 639 | |||
| 640 | |||
| 641 | 11. MMIO Space and "Write Posting" | ||
| 642 | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ | 607 | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
| 643 | 608 | ||
| 644 | Converting a driver from using I/O Port space to using MMIO space | 609 | Converting a driver from using I/O Port space to using MMIO space |
diff --git a/arch/alpha/Kconfig b/arch/alpha/Kconfig index 4c002ba37e50..c613d5fb0daa 100644 --- a/arch/alpha/Kconfig +++ b/arch/alpha/Kconfig | |||
| @@ -318,11 +318,6 @@ config PCI | |||
| 318 | your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or | 318 | your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or |
| 319 | VESA. If you have PCI, say Y, otherwise N. | 319 | VESA. If you have PCI, say Y, otherwise N. |
| 320 | 320 | ||
| 321 | The PCI-HOWTO, available from | ||
| 322 | <http://www.tldp.org/docs.html#howto>, contains valuable | ||
| 323 | information about which PCI hardware does work under Linux and which | ||
| 324 | doesn't. | ||
| 325 | |||
| 326 | config PCI_DOMAINS | 321 | config PCI_DOMAINS |
| 327 | bool | 322 | bool |
| 328 | default y | 323 | default y |
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig index 77201d3f7479..5d5997ca7011 100644 --- a/arch/arm/Kconfig +++ b/arch/arm/Kconfig | |||
| @@ -577,11 +577,6 @@ config PCI | |||
| 577 | your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or | 577 | your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or |
| 578 | VESA. If you have PCI, say Y, otherwise N. | 578 | VESA. If you have PCI, say Y, otherwise N. |
| 579 | 579 | ||
| 580 | The PCI-HOWTO, available from | ||
| 581 | <http://www.tldp.org/docs.html#howto>, contains valuable | ||
| 582 | information about which PCI hardware does work under Linux and which | ||
| 583 | doesn't. | ||
| 584 | |||
| 585 | config PCI_SYSCALL | 580 | config PCI_SYSCALL |
| 586 | def_bool PCI | 581 | def_bool PCI |
| 587 | 582 | ||
diff --git a/arch/frv/Kconfig b/arch/frv/Kconfig index 43153e767bb1..afb19b0d761d 100644 --- a/arch/frv/Kconfig +++ b/arch/frv/Kconfig | |||
| @@ -322,11 +322,6 @@ config PCI | |||
| 322 | onboard. If you have one of these boards and you wish to use the PCI | 322 | onboard. If you have one of these boards and you wish to use the PCI |
| 323 | facilities, say Y here. | 323 | facilities, say Y here. |
| 324 | 324 | ||
| 325 | The PCI-HOWTO, available from | ||
| 326 | <http://www.tldp.org/docs.html#howto>, contains valuable | ||
| 327 | information about which PCI hardware does work under Linux and which | ||
| 328 | doesn't. | ||
| 329 | |||
| 330 | config RESERVE_DMA_COHERENT | ||
