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SubjectRe: [PATCH v2 -mm 7/7] I/OAT: Add DCA services
On Thu, 23 Aug 2007 17:15:27 -0700 Shannon Nelson wrote:

> Add code to connect to the DCA driver and provide cpu tags for use by
> drivers that would like to use Direct Cache Access hints.
>
> [Adrian Bunk] Several Kconfig cleanup items
> [Andrew Morten, Chris Leech] fix for using cpu_physical_id() even when
> built for uni-processor
>
> Signed-off-by: Shannon Nelson <shannon.nelson@intel.com>
> Acked-by: David S. Miller <davem@davemloft.net>
> ---
>
> drivers/dca/Kconfig | 7 -
> drivers/dma/Kconfig | 60 ++++++-----
> drivers/dma/Makefile | 2
> drivers/dma/ioat.c | 12 ++
> drivers/dma/ioat_dca.c | 267 ++++++++++++++++++++++++++++++++++++++++++++++++
> drivers/dma/ioatdma.h | 2
> 6 files changed, 318 insertions(+), 32 deletions(-)
>
> diff --git a/drivers/dma/ioat_dca.c b/drivers/dma/ioat_dca.c
> new file mode 100644
> index 0000000..03c993a
> --- /dev/null
> +++ b/drivers/dma/ioat_dca.c
> @@ -0,0 +1,267 @@

> +
> +/* either a kernel change is needed, or we need something like this in kernel */
> +#ifndef CONFIG_SMP
> +#include <asm/smp.h>
> +#undef cpu_physical_id
> +#define cpu_physical_id(cpu) (cpuid_ebx(1) >> 24)
> +#endif
> +
> +#include "ioatdma.h"
> +#include "ioatdma_registers.h"
> +
> +/* THIS STUFF NEEDS TO LIVE SOMEWHERE ELSE */
> +#define X86_FEATURE_DCA (4*32+18) /* Direct Cache Access */
> +/* / THIS STUFF NEEDS TO LIVE SOMEWHERE ELSE */

Yes, feature bits need to be integrated with the other CPU-specific
feature bits.

> +/* pack PCI B/D/F into a u16 */
> +static inline u16 dcaid_from_pcidev(struct pci_dev *pci)
> +{
> + return (pci->bus->number << 8) | pci->devfn;
> +}

Could any other PCI users use this in include/linux/pci.h ?


> diff --git a/drivers/dma/ioatdma.h b/drivers/dma/ioatdma.h
> index 5931e56..d59c90b 100644
> --- a/drivers/dma/ioatdma.h
> +++ b/drivers/dma/ioatdma.h
> @@ -132,9 +132,11 @@ struct ioat_desc_sw {
> #if defined(CONFIG_INTEL_IOATDMA) || defined(CONFIG_INTEL_IOATDMA_MODULE)
> struct ioatdma_device *ioat_dma_probe(struct pci_dev *, void __iomem *);
> void ioat_dma_remove(struct ioatdma_device *device);
> +struct dca_provider *ioat_dca_init(struct pci_dev *, void __iomem *);

Parameter (variable) names in prototypes, please.

> #else
> #define ioat_dma_probe(pdev, io) NULL
> #define ioat_dma_remove(dev) do { } while (0)
> +#define ioat_dca_init(pdev, io) NULL
> #endif
>
> #endif /* IOATDMA_H */


---
~Randy
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