> From: "Christopher Hoover" <[EMAIL PROTECTED]>
> Date: Fri, 6 Jun 2003 10:58:50 -0700
> > So all I/O buffers _must_ be allocated using kmalloc()
>
> Use GFP_DMA flag on the kmalloc() call, too, whenever possible.
> This will help avoid bounce buffering on some systems.
Wrong!!! Where did yo
> So all I/O buffers _must_ be allocated using kmalloc()
Use GFP_DMA flag on the kmalloc() call, too, whenever possible.
/* Flag - indicates that the buffer will be suitable for DMA. Ignored
on some
platforms, used as appropriate on others */
#define GFP_DMA __GFP_DMA
This will
> > > I don't follow you. What's inefficient about this? It looks like the
> > > decision of whether or not to call dma_cache_wback_inv() has nothing to
> > > do with what other data is stored in the same memory block with the
> > > output buffer. And there's nothing that indicates
> > > dma_ca
On Thu, 5 Jun 2003, Oliver Neukum wrote:
> > > extern inline dma_addr_t pci_map_single(struct pci_dev *hwdev, void *ptr,
> > > size_t size, int direction)
> > > {
> > > if (direction == PCI_DMA_NONE)
> > > BUG();
> > >
> > > #ifndef CONFIG_COHERENT_IO
