search for: dma_map_pag

This v4 is now a 3 piece series, after Alexandre pointed out that both GF 100 and NV50 are affected by the same issue, and that a related issue has been solved already for Tegra in commit 9d0394c6bed5 ("drm/nouveau/instmem/gk20a: set DMA mask early"). The issue that this series addresses is the fact that the Nouveau driver invokes the DMA API before setting the DMA mask. In both cases

On Wed, Dec 07, 2016 at 10:59:12PM -0800, Wendy Liang wrote: > If sg is already dma mapped, do not call dma_map_page() in > vring_map_one_sg(). > > In case of rpmsg, rpmsg uses dma_alloc_coherent() to allocate > memory to share with the remote. There is no pages setup > in dma_alloc_coherent(). > > In this case, we cannot convert the virtual address back to the > physical address. In th...

On Wed, Dec 07, 2016 at 10:59:12PM -0800, Wendy Liang wrote: > If sg is already dma mapped, do not call dma_map_page() in > vring_map_one_sg(). > > In case of rpmsg, rpmsg uses dma_alloc_coherent() to allocate > memory to share with the remote. There is no pages setup > in dma_alloc_coherent(). > > In this case, we cannot convert the virtual address back to the > physical address. In th...

If sg is already dma mapped, do not call dma_map_page() in vring_map_one_sg(). In case of rpmsg, rpmsg uses dma_alloc_coherent() to allocate memory to share with the remote. There is no pages setup in dma_alloc_coherent(). In this case, we cannot convert the virtual address back to the physical address. In this case, we can setup the sg_dma_addr to...

If sg is already dma mapped, do not call dma_map_page() in vring_map_one_sg(). In case of rpmsg, rpmsg uses dma_alloc_coherent() to allocate memory to share with the remote. There is no pages setup in dma_alloc_coherent(). In this case, we cannot convert the virtual address back to the physical address. In this case, we can setup the sg_dma_addr to...

The 100c08 scratch page is mapped using dma_map_page() before the TTM layer has had a chance to set the DMA mask. This means we are still running with the default of 32 when this code executes, and this causes problems for platforms with no memory below 4 GB (such as AMD Seattle) So move the dma_map_page() to the .init hook, and set the streaming D...

The 100c08 scratch page is mapped using dma_map_page() before the TTM layer has had a chance to set the DMA mask. This means we are still running with the default of 32 when this code executes, and this causes problems for platforms with no memory below 4 GB (such as AMD Seattle) So move the dma_map_page() to the .init hook, and set the streaming D...

The 100c08 scratch page is mapped using dma_map_page() before the TTM layer has had a chance to set the DMA mask. This means we are still running with the default of 32 when this code executes, and this causes problems for platforms with no memory below 4 GB (such as AMD Seattle) So move the dma_map_page() to the .init hook, and set the streaming D...

...te. In this case, as there is no pages setup in the dma_alloc_coherent(), we cannot get the physical address back from the virtual address, and thus, we can set the sg_dma_addr to store the DMA address and mark it already DMA mapped. When virtio vring sees the sg_dma_addr is ready set, do not call dma_map_page(). The issue was once discussed here: http://virtualization.linux-foundation.narkive.com/CfVP32Vy/rfc-0-4-rpmsg-fix-init-of-dma-able-virtqueues Edgar E. Iglesias (1): rpmsg: DMA map sgs passed to virtio Wendy Liang (1): virtio_ring: Do not call dma_map_page if sg is already mapped. driver...

...te. In this case, as there is no pages setup in the dma_alloc_coherent(), we cannot get the physical address back from the virtual address, and thus, we can set the sg_dma_addr to store the DMA address and mark it already DMA mapped. When virtio vring sees the sg_dma_addr is ready set, do not call dma_map_page(). The issue was once discussed here: http://virtualization.linux-foundation.narkive.com/CfVP32Vy/rfc-0-4-rpmsg-fix-init-of-dma-able-virtqueues Edgar E. Iglesias (1): rpmsg: DMA map sgs passed to virtio Wendy Liang (1): virtio_ring: Do not call dma_map_page if sg is already mapped. driver...

The 100c10 scratch page is mapped using dma_map_page() before the TTM layer has had a chance to set the DMA mask. This means we are still running with the default of 32 when this code executes, and this causes problems for platforms with no memory below 4 GB (such as AMD Seattle) So move the dma_map_page() to the .init hook, which executes after th...

The 100c08 scratch page is mapped using dma_map_page() before the TTM layer has had a chance to set the DMA mask. This means we are still running with the default of 32 when this code executes, and this causes problems for platforms with no memory below 4 GB (such as AMD Seattle) So move the dma_map_page() to the .init hook, which executes after th...

...te. In this case, as there is no pages setup in the dma_alloc_coherent(), we cannot get the physical address back from the virtual address, and thus, we can set the sg_dma_addr to store the DMA address and mark it already DMA mapped. When virtio vring sees the sg_dma_addr is ready set, do not call dma_map_page(). The issue was once discussed here: http://virtualization.linux-foundation.narkive.com/CfVP32Vy/rfc-0-4-rpmsg-fix-init-of-dma-able-virtqueues Edgar E. Iglesias (1): rpmsg: DMA map sgs passed to virtio Wendy Liang (1): virtio_ring: Do not call dma_map_page if sg is already mapped. driver...

...te. In this case, as there is no pages setup in the dma_alloc_coherent(), we cannot get the physical address back from the virtual address, and thus, we can set the sg_dma_addr to store the DMA address and mark it already DMA mapped. When virtio vring sees the sg_dma_addr is ready set, do not call dma_map_page(). The issue was once discussed here: http://virtualization.linux-foundation.narkive.com/CfVP32Vy/rfc-0-4-rpmsg-fix-init-of-dma-able-virtqueues Edgar E. Iglesias (1): rpmsg: DMA map sgs passed to virtio Wendy Liang (1): virtio_ring: Do not call dma_map_page if sg is already mapped. driver...

Ard Biesheuvel <ard.biesheuvel at linaro.org> writes: > The 100c08 scratch page is mapped using dma_map_page() before the TTM > layer has had a chance to set the DMA mask. This means we are still > running with the default of 32 when this code executes, and this causes > problems for platforms with no memory below 4 GB (such as AMD Seattle) > > So move the dma_map_page() to the .init hook,...

...tat == ENABLED) { @@ -1377,17 +1379,22 @@ nouveau_ttm_tt_populate(struct ttm_tt *ttm) } for (i = 0; i < ttm->num_pages; i++) { - ttm_dma->dma_address[i] = nv_device_map_page(device, - ttm->pages[i]); - if (!ttm_dma->dma_address[i]) { + dma_addr_t addr; + + addr = dma_map_page(pdev, ttm->pages[i], 0, PAGE_SIZE, + DMA_BIDIRECTIONAL); + + if (dma_mapping_error(pdev, addr)) { while (--i) { - nv_device_unmap_page(device, - ttm_dma->dma_address[i]); + dma_unmap_page(pdev, ttm_dma->dma_address[i], + PAGE_SIZE, DMA_BIDIRECTIONAL)...

This v4 is now a 3 piece series (since v4), after Alexandre pointed out that both GF 100 and NV50 are affected by the same issue, and that a related issue has been solved already for Tegra in commit 9d0394c6bed5 ("drm/nouveau/instmem/gk20a: set DMA mask early"). The issue that this series addresses is the fact that the Nouveau driver invokes the DMA API before setting the DMA mask. In

...te. In this case, as there is no pages setup in the dma_alloc_coherent(), we cannot get the physical address back from the virtual address, and thus, we can set the sg_dma_addr to store the DMA address and mark it already DMA mapped. When virtio vring sees the sg_dma_addr is ready set, do not call dma_map_page(). The issue was once discussed here: http://virtualization.linux-foundation.narkive.com/CfVP32Vy/rfc-0-4-rpmsg-fix-init-of-dma-able-virtqueues Edgar E. Iglesias (1): rpmsg: DMA map sgs passed to virtio Wendy Liang (1): virtio_ring: Do not call dma_map_page if sg is already mapped. driver...

...te. In this case, as there is no pages setup in the dma_alloc_coherent(), we cannot get the physical address back from the virtual address, and thus, we can set the sg_dma_addr to store the DMA address and mark it already DMA mapped. When virtio vring sees the sg_dma_addr is ready set, do not call dma_map_page(). The issue was once discussed here: http://virtualization.linux-foundation.narkive.com/CfVP32Vy/rfc-0-4-rpmsg-fix-init-of-dma-able-virtqueues Edgar E. Iglesias (1): rpmsg: DMA map sgs passed to virtio Wendy Liang (1): virtio_ring: Do not call dma_map_page if sg is already mapped. driver...

...te. In this case, as there is no pages setup in the dma_alloc_coherent(), we cannot get the physical address back from the virtual address, and thus, we can set the sg_dma_addr to store the DMA address and mark it already DMA mapped. When virtio vring sees the sg_dma_addr is ready set, do not call dma_map_page(). The issue was once discussed here: http://virtualization.linux-foundation.narkive.com/CfVP32Vy/rfc-0-4-rpmsg-fix-init-of-dma-able-virtqueues Edgar E. Iglesias (1): rpmsg: DMA map sgs passed to virtio Wendy Liang (1): virtio_ring: Do not call dma_map_page if sg is already mapped. driver...