On 10/24/2012 01:48 PM, Gregory CLEMENT wrote:
> On 10/24/2012 01:36 PM, Arnd Bergmann wrote:
>> On Wednesday 24 October 2012, Gregory CLEMENT wrote:
>>> +void __init armada_370_xp_coherency_iocache_init(void)
>>> +{
>>> + /* When the coherency fabric is available, the Armada XP and
>>> + * Aramada 370 are close to a coherent architecture, so we based
>>> + * our dma ops on the coherent one, and just changes the
>>> + * operations which need a arch io sync */
>>> + if (of_find_compatible_node(NULL, NULL,
>>> "marvell,coherency-fabric")) {
>>> + struct dma_map_ops *dma_ops = &armada_xp_dma_ops;
>>> + memcpy(dma_ops, &arm_coherent_dma_ops, sizeof(*dma_ops));
>>> + dma_ops->map_page = armada_xp_dma_map_page;
>>> + dma_ops->unmap_page = armada_xp_dma_unmap_page;
>>> + dma_ops->unmap_sg = arm_dma_ops.unmap_sg;
>>> + dma_ops->sync_single_for_cpu = armada_xp_dma_sync;
>>> + dma_ops->sync_single_for_device = armada_xp_dma_sync;
>>> + dma_ops->sync_sg_for_cpu = arm_dma_ops.sync_sg_for_cpu;
>>> + dma_ops->sync_sg_for_device =
>>> arm_dma_ops.sync_sg_for_device;
>>> + }
>>> + bus_register_notifier(&platform_bus_type, &armada_xp_platform_nb);
>>
>> I think it would be cleaner to statically define the operations in a constant
>> structure and point directly to the functions you need. If necessary, use
>> multiple structures.
>
> My problem was that these functions are not exposed, only arm_dma_op and
> arm_coherent_dma_ops are exported.
> Or do you think about something like this:
>
> struct dma_map_ops *dma_ops = {
> .alloc = arm_dma_ops.arm_coherent_dma_alloc,
> .free = arm_dma_ops.arm_coherent_dma_free,
> .mmap = arm_dma_ops.arm_dma_mmap,
> .get_sgtable = arm_dma_ops.arm_dma_get_sgtable,
> .map_sg = arm_dma_ops.arm_dma_map_sg,
> .set_dma_mask = arm_dma_ops.arm_dma_set_mask,
> .map_page = armada_xp_dma_map_page,
> .unmap_page = armada_xp_dma_unmap_page,
> .unmap_sg = arm_dma_ops.unmap_sg,
> .sync_single_for_cpu = armada_xp_dma_sync,
> .sync_single_for_device = armada_xp_dma_sync,
> .sync_sg_for_cpu = arm_dma_ops.sync_sg_for_cpu,
> .sync_sg_for_device = arm_dma_ops.sync_sg_for_device,
> };
I was too fast to reply this struct is wrong, it should be as this one:
struct dma_map_ops *dma_ops = {
.alloc = arm_coherent_dma_ops.arm_coherent_dma_alloc,
.free = arm_coherent_dma_ops.arm_coherent_dma_free,
.mmap = arm_coherent_dma_ops.arm_dma_mmap,
.get_sgtable = arm_coherent_dma_ops.arm_dma_get_sgtable,
.map_sg = arm_coherent_dma_ops.arm_dma_map_sg,
.set_dma_mask = arm_coherent_dma_ops.arm_dma_set_mask,
.map_page = armada_xp_dma_map_page,
.unmap_page = armada_xp_dma_unmap_page,
.unmap_sg = arm_dma_ops.unmap_sg,
.sync_single_for_cpu = armada_xp_dma_sync,
.sync_single_for_device = armada_xp_dma_sync,
.sync_sg_for_cpu = arm_dma_ops.sync_sg_for_cpu,
.sync_sg_for_device = arm_dma_ops.sync_sg_for_device,
};
Thanks,
Gregory
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