Randy Dunlap [mailto:[email protected]]
>
>On Thu, 23 Aug 2007 17:15:17 -0700 Shannon Nelson wrote:
>
>> Add support for MSI and MSI-X interrupt handling, including
>the ability
>> to choose the desired interrupt method.
>>
>> Signed-off-by: Shannon Nelson <[email protected]>
>> Acked-by: David S. Miller <[email protected]>
>> ---
>>
>> drivers/dma/ioat_dma.c | 353
>++++++++++++++++++++++++++++++++-------
>> drivers/dma/ioatdma.h | 12 +
>> drivers/dma/ioatdma_registers.h | 6 +
>> 3 files changed, 305 insertions(+), 66 deletions(-)
>>
>> diff --git a/drivers/dma/ioat_dma.c b/drivers/dma/ioat_dma.c
>> index 9012176..0909fee 100644
>> --- a/drivers/dma/ioat_dma.c
>> +++ b/drivers/dma/ioat_dma.c
>> @@ -47,6 +47,71 @@
>> static void ioat_dma_start_null_desc(struct ioat_dma_chan
>*ioat_chan);
>> static void ioat_dma_memcpy_cleanup(struct ioat_dma_chan
>*ioat_chan);
>>
>> +#define for_each_bit(bit, addr, size) \
>> + for ((bit) = find_first_bit((addr), (size)); \
>> + (bit) < (size); \
>> + (bit) = find_next_bit((addr), (size), (bit) + 1))
>
>Any reason that this macro shouldn't be added to
>include/linux/bitops.h instead of here? I'd prefer/expect such
>general-purpose macros to live somewhere else.
Sure, I can do this. Davem had a similar comment earlier.
>
>
>> @@ -276,6 +352,34 @@ static void
>ioat_dma_free_chan_resources(struct dma_chan *chan)
>> in_use_descs - 1);
>>
>> ioat_chan->last_completion = ioat_chan->completion_addr = 0;
>> + ioat_chan->pending = 0;
>> +}
>> +/**
>> + * ioat_dma_get_next_descriptor - return the next available
>descriptor from
>> + * the chain
>
>Unfortunately, function name + short description in kernel-doc must be
>on one line (only). If you want to add more text/description, put it
>after the parameters (like you have done :).
Got it.
>
>> + * @ioat_chan: IOAT DMA channel handle
>
>We normally use one
> *
>line between the parameters and following text.
Okay
>
>> + * Gets the next descriptor from the chain, and must be
>called with the
>> + * channel's desc_lock held. Allocates more descriptors if
>the channel
>> + * has run out.
>> + */
>> +static struct ioat_desc_sw *ioat_dma_get_next_descriptor(
>> + struct
>ioat_dma_chan *ioat_chan)
>> +{
>> + struct ioat_desc_sw *new = NULL;
>> +
>> + if (!list_empty(&ioat_chan->free_desc)) {
>> + new = to_ioat_desc(ioat_chan->free_desc.next);
>> + list_del(&new->node);
>> + } else {
>> + /* try to get another desc */
>> + new = ioat_dma_alloc_descriptor(ioat_chan, GFP_ATOMIC);
>> + /* will this ever happen? */
>> + /* TODO add upper limit on these */
>> + BUG_ON(!new);
>> + }
>> +
>> + prefetch(new->hw);
>> + return new;
>> }
>>
>> static struct dma_async_tx_descriptor *ioat_dma_prep_memcpy(
>> @@ -639,6 +711,162 @@ out:
>> return err;
>> }
>>
>> +static char ioat_interrupt_style[32] = "msix";
>> +module_param_string(ioat_interrupt_style, ioat_interrupt_style,
>> + sizeof(ioat_interrupt_style), 0644);
>> +MODULE_PARM_DESC(ioat_interrupt_style,
>> + "set ioat interrupt style: msix (default), "
>> + "msix-single-vector, msi, intx)");
>> +
>> +/**
>> + * ioat_dma_setup_interrupts - setup interrupt handler,
>choosing btwn msix,
>> + * msi, and legacy
>
>Same one-line nit. legacy == intx, I suppose.
Got it.
>
>
>> + * @device: ioat device
>> + */
>> +int ioat_dma_setup_interrupts(struct ioatdma_device *device)
>> +{
>> + struct ioat_dma_chan *ioat_chan;
>> + int err, i, j, msixcnt;
>> + u8 intrctrl = 0;
>> +
>> + if (!strcmp(ioat_interrupt_style, "msix"))
>> + goto msix;
>> + else if (!strcmp(ioat_interrupt_style, "msix-single-vector"))
>> + goto msix_single_vector;
>> + else if (!strcmp(ioat_interrupt_style, "msi"))
>> + goto msi;
>> + else if (!strcmp(ioat_interrupt_style, "intx"))
>> + goto intx;
>
>The "else"s aren't needed.
Hmmm - yep.
>
>> +
>> +msix:
>
>...
>
>---
>~Randy
>*** Remember to use Documentation/SubmitChecklist when testing
>your code ***
>
Thanks,
sln
--
======================================================================
Mr. Shannon Nelson LAN Access Division, Intel Corp.
[email protected] I don't speak for Intel
(503) 712-7659 Parents can't afford to be squeamish.
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