Hi Hiroshi,
2012/10/16 Hiroshi Doyu hdoyu@nvidia.com:
Hi Inki/Marek,
On Tue, 16 Oct 2012 02:50:16 +0200 Inki Dae inki.dae@samsung.com wrote:
2012/10/15 Marek Szyprowski m.szyprowski@samsung.com:
Hello,
Some devices, which have IOMMU, for some use cases might require to allocate a buffers for DMA which is contiguous in physical memory. Such use cases appears for example in DRM subsystem when one wants to improve performance or use secure buffer protection.
I would like to ask if adding a new attribute, as proposed in this RFC is a good idea? I feel that it might be an attribute just for a single driver, but I would like to know your opinion. Should we look for other solution?
In addition, currently we have worked dma-mapping-based iommu support for exynos drm driver with this patch set so this patch set has been tested with iommu enabled exynos drm driver and worked fine. actually, this feature is needed for secure mode such as TrustZone. in case of Exynos SoC, memory region for secure mode should be physically contiguous and also maybe OMAP but now dma-mapping framework doesn't guarantee physically continuous memory allocation so this patch set would make it possible.
Agree that the contigous memory allocation is necessary for us too.
In addition to those contiguous/discontiguous page allocation, is there any way to _import_ anonymous pages allocated by a process to be used in dma-mapping API later?
I'm considering the following scenario, an user process allocates a buffer by malloc() in advance, and then it asks some driver to convert that buffer into IOMMU'able/DMA'able ones later. In this case, pages are discouguous and even they may not be yet allocated at malloc()/mmap().
I'm not sure I understand what you mean but we had already tried this way and for this, you can refer to below link, http://www.mail-archive.com/dri-devel@lists.freedesktop.org/msg22555.html
but this way had been pointed out by drm guys because the pages could be used through gem object after that pages had been freed by free() anyway their pointing was reasonable and I'm trying another way, this is the way that the pages to user space has same life time with dma operation. in other word, if dma completed access to that pages then also that pages will be freed. actually drm-based via driver of mainline kernel is using same way
-- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a>