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Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jbarnes/pci-2.6

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* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jbarnes/pci-2.6: (21 commits)
  pciehp: fix error message about getting hotplug control
  pci/irq: let pci_device_shutdown to call pci_msi_shutdown v2
  pci/irq: restore mask_bits in msi shutdown -v3
  doc: replace yet another dev with pdev for consistency in DMA-mapping.txt
  PCI: don't expose struct pci_vpd to userspace
  doc: fix an incorrect suggestion to pass NULL for PCI like buses
  Consistently use pdev as the variable of type struct pci_dev *.
  pciehp: Fix command write
  shpchp: fix slot name
  make pciehp_acpi_get_hp_hw_control_from_firmware()
  pciehp: Clean up pcie_init()
  pciehp: Mask hotplug interrupt at controller release
  pciehp: Remove useless hotplug interrupt enabling
  pciehp: Fix wrong slot capability check
  pciehp: Fix wrong slot control register access
  pciehp: Add missing memory barrier
  pciehp: Fix interrupt event handlig
  pciehp: fix slot name
  Update MAINTAINERS with location of PCI tree
  PCI: Add Intel SCH PCI IDs
  ...
This commit is contained in:
Linus Torvalds
2008-04-29 10:17:59 -07:00
parent 8f45c1a58a a53edac131
commit a217656cb2
13 changed files with 306 additions and 472 deletions
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38
Documentation/DMA-mapping.txt
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@@ -315,11 +315,11 @@ you should do:
dma_addr_t dma_handle;
cpu_addr = pci_alloc_consistent(dev, size, &dma_handle);
cpu_addr = pci_alloc_consistent(pdev, size, &dma_handle);
where dev is a struct pci_dev *. You should pass NULL for PCI like buses
where devices don't have struct pci_dev (like ISA, EISA). This may be
called in interrupt context.
where pdev is a struct pci_dev *. This may be called in interrupt context.
You should use dma_alloc_coherent (see DMA-API.txt) for buses
where devices don't have struct pci_dev (like ISA, EISA).
This argument is needed because the DMA translations may be bus
specific (and often is private to the bus which the device is attached
@@ -332,7 +332,7 @@ __get_free_pages (but takes size instead of a page order). If your
driver needs regions sized smaller than a page, you may prefer using
the pci_pool interface, described below.
The consistent DMA mapping interfaces, for non-NULL dev, will by
The consistent DMA mapping interfaces, for non-NULL pdev, will by
default return a DMA address which is SAC (Single Address Cycle)
addressable. Even if the device indicates (via PCI dma mask) that it
may address the upper 32-bits and thus perform DAC cycles, consistent
@@ -354,9 +354,9 @@ buffer you receive will not cross a 64K boundary.
To unmap and free such a DMA region, you call:
pci_free_consistent(dev, size, cpu_addr, dma_handle);
pci_free_consistent(pdev, size, cpu_addr, dma_handle);
where dev, size are the same as in the above call and cpu_addr and
where pdev, size are the same as in the above call and cpu_addr and
dma_handle are the values pci_alloc_consistent returned to you.
This function may not be called in interrupt context.
@@ -371,9 +371,9 @@ Create a pci_pool like this:
struct pci_pool *pool;
pool = pci_pool_create(name, dev, size, align, alloc);
pool = pci_pool_create(name, pdev, size, align, alloc);
The "name" is for diagnostics (like a kmem_cache name); dev and size
The "name" is for diagnostics (like a kmem_cache name); pdev and size
are as above. The device's hardware alignment requirement for this
type of data is "align" (which is expressed in bytes, and must be a
power of two). If your device has no boundary crossing restrictions,
@@ -472,11 +472,11 @@ To map a single region, you do:
void *addr = buffer->ptr;
size_t size = buffer->len;
dma_handle = pci_map_single(dev, addr, size, direction);
dma_handle = pci_map_single(pdev, addr, size, direction);
and to unmap it:
pci_unmap_single(dev, dma_handle, size, direction);
pci_unmap_single(pdev, dma_handle, size, direction);
You should call pci_unmap_single when the DMA activity is finished, e.g.
from the interrupt which told you that the DMA transfer is done.
@@ -493,17 +493,17 @@ Specifically:
unsigned long offset = buffer->offset;
size_t size = buffer->len;
dma_handle = pci_map_page(dev, page, offset, size, direction);
dma_handle = pci_map_page(pdev, page, offset, size, direction);
...
pci_unmap_page(dev, dma_handle, size, direction);
pci_unmap_page(pdev, dma_handle, size, direction);
Here, "offset" means byte offset within the given page.
With scatterlists, you map a region gathered from several regions by:
int i, count = pci_map_sg(dev, sglist, nents, direction);
int i, count = pci_map_sg(pdev, sglist, nents, direction);
struct scatterlist *sg;
for_each_sg(sglist, sg, count, i) {
@@ -527,7 +527,7 @@ accessed sg->address and sg->length as shown above.
To unmap a scatterlist, just call:
pci_unmap_sg(dev, sglist, nents, direction);
pci_unmap_sg(pdev, sglist, nents, direction);
Again, make sure DMA activity has already finished.
@@ -550,11 +550,11 @@ correct copy of the DMA buffer.
So, firstly, just map it with pci_map_{single,sg}, and after each DMA
transfer call either:
pci_dma_sync_single_for_cpu(dev, dma_handle, size, direction);
pci_dma_sync_single_for_cpu(pdev, dma_handle, size, direction);
or:
pci_dma_sync_sg_for_cpu(dev, sglist, nents, direction);
pci_dma_sync_sg_for_cpu(pdev, sglist, nents, direction);
as appropriate.
@@ -562,7 +562,7 @@ Then, if you wish to let the device get at the DMA area again,
finish accessing the data with the cpu, and then before actually
giving the buffer to the hardware call either:
pci_dma_sync_single_for_device(dev, dma_handle, size, direction);
pci_dma_sync_single_for_device(pdev, dma_handle, size, direction);
or:
@@ -739,7 +739,7 @@ failure can be determined by:
dma_addr_t dma_handle;
dma_handle = pci_map_single(dev, addr, size, direction);
dma_handle = pci_map_single(pdev, addr, size, direction);
if (pci_dma_mapping_error(dma_handle)) {
/*
* reduce current DMA mapping usage,