mirror of https://gitee.com/openkylin/linux.git
drm/nouveau/instmem/gk20a: use DMA API CPU mapping
Commit 69c4938249 ("drm/nouveau/instmem/gk20a: use direct CPU access")
tried to be smart while using the DMA-API by managing the CPU mappings of
buffers allocated with the DMA-API by itself. In doing so, it relied
on dma_to_phys() which is an architecture-private function not
available everywhere. This broke the build on several architectures.
Since there is no reliable and portable way to obtain the physical
address of a DMA-API buffer, stop trying to be smart and just use the
CPU mapping that the DMA-API can provide. This means that buffers will
be CPU-mapped for all their life as opposed to when we need them, but
anyway using the DMA-API here is a fallback for when no IOMMU is
available so we should not expect optimal behavior.
This makes the IOMMU and DMA-API implementations of instmem diverge
enough that we should maybe put them into separate files...
Signed-off-by: Alexandre Courbot <acourbot@nvidia.com>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
This commit is contained in:
Alexandre Courbot
Ben Skeggs
parent
338840eed1
commit
b306712d92
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@ -56,9 +56,6 @@ struct gk20a_instobj {
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/* CPU mapping */
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u32 *vaddr;
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struct list_head vaddr_node;
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/* How many clients are using vaddr? */
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u32 use_cpt;
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};
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#define gk20a_instobj(p) container_of((p), struct gk20a_instobj, memory)
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@ -68,7 +65,6 @@ struct gk20a_instobj {
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struct gk20a_instobj_dma {
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struct gk20a_instobj base;
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u32 *cpuaddr;
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dma_addr_t handle;
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struct nvkm_mm_node r;
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};
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@ -81,6 +77,11 @@ struct gk20a_instobj_dma {
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struct gk20a_instobj_iommu {
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struct gk20a_instobj base;
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/* to link into gk20a_instmem::vaddr_lru */
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struct list_head vaddr_node;
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/* how many clients are using vaddr? */
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u32 use_cpt;
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/* will point to the higher half of pages */
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dma_addr_t *dma_addrs;
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/* array of base.mem->size pages (+ dma_addr_ts) */
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@ -109,8 +110,6 @@ struct gk20a_instmem {
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/* Only used by DMA API */
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struct dma_attrs attrs;
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void __iomem * (*cpu_map)(struct nvkm_memory *);
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};
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#define gk20a_instmem(p) container_of((p), struct gk20a_instmem, base)
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@ -132,52 +131,19 @@ gk20a_instobj_size(struct nvkm_memory *memory)
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return (u64)gk20a_instobj(memory)->mem.size << 12;
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}
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static void __iomem *
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gk20a_instobj_cpu_map_dma(struct nvkm_memory *memory)
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{
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#if defined(CONFIG_ARM) || defined(CONFIG_ARM64)
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struct gk20a_instobj_dma *node = gk20a_instobj_dma(memory);
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struct device *dev = node->base.imem->base.subdev.device->dev;
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int npages = nvkm_memory_size(memory) >> 12;
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struct page *pages[npages];
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int i;
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/* we shouldn't see a gk20a on anything but arm/arm64 anyways */
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/* phys_to_page does not exist on all platforms... */
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pages[0] = pfn_to_page(dma_to_phys(dev, node->handle) >> PAGE_SHIFT);
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for (i = 1; i < npages; i++)
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pages[i] = pages[0] + i;
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return vmap(pages, npages, VM_MAP, pgprot_writecombine(PAGE_KERNEL));
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#else
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BUG();
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return NULL;
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#endif
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}
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static void __iomem *
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gk20a_instobj_cpu_map_iommu(struct nvkm_memory *memory)
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{
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struct gk20a_instobj_iommu *node = gk20a_instobj_iommu(memory);
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int npages = nvkm_memory_size(memory) >> 12;
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return vmap(node->pages, npages, VM_MAP,
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pgprot_writecombine(PAGE_KERNEL));
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}
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/*
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* Recycle the vaddr of obj. Must be called with gk20a_instmem::lock held.
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*/
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static void
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gk20a_instobj_recycle_vaddr(struct gk20a_instobj *obj)
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gk20a_instobj_iommu_recycle_vaddr(struct gk20a_instobj_iommu *obj)
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{
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struct gk20a_instmem *imem = obj->imem;
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struct gk20a_instmem *imem = obj->base.imem;
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/* there should not be any user left... */
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WARN_ON(obj->use_cpt);
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list_del(&obj->vaddr_node);
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vunmap(obj->vaddr);
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obj->vaddr = NULL;
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imem->vaddr_use -= nvkm_memory_size(&obj->memory);
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vunmap(obj->base.vaddr);
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obj->base.vaddr = NULL;
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imem->vaddr_use -= nvkm_memory_size(&obj->base.memory);
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nvkm_debug(&imem->base.subdev, "vaddr used: %x/%x\n", imem->vaddr_use,
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imem->vaddr_max);
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}
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@ -193,17 +159,30 @@ gk20a_instmem_vaddr_gc(struct gk20a_instmem *imem, const u64 size)
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if (list_empty(&imem->vaddr_lru))
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break;
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gk20a_instobj_recycle_vaddr(list_first_entry(&imem->vaddr_lru,
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struct gk20a_instobj, vaddr_node));
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gk20a_instobj_iommu_recycle_vaddr(
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list_first_entry(&imem->vaddr_lru,
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struct gk20a_instobj_iommu, vaddr_node));
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}
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}
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static void __iomem *
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gk20a_instobj_acquire(struct nvkm_memory *memory)
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gk20a_instobj_acquire_dma(struct nvkm_memory *memory)
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{
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struct gk20a_instobj *node = gk20a_instobj(memory);
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struct gk20a_instmem *imem = node->imem;
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struct nvkm_ltc *ltc = imem->base.subdev.device->ltc;
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nvkm_ltc_flush(ltc);
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return node->vaddr;
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}
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static void __iomem *
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gk20a_instobj_acquire_iommu(struct nvkm_memory *memory)
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{
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struct gk20a_instobj_iommu *node = gk20a_instobj_iommu(memory);
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struct gk20a_instmem *imem = node->base.imem;
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struct nvkm_ltc *ltc = imem->base.subdev.device->ltc;
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const u64 size = nvkm_memory_size(memory);
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unsigned long flags;
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@ -211,7 +190,7 @@ gk20a_instobj_acquire(struct nvkm_memory *memory)
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spin_lock_irqsave(&imem->lock, flags);
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if (node->vaddr) {
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if (node->base.vaddr) {
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if (!node->use_cpt) {
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/* remove from LRU list since mapping in use again */
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list_del(&node->vaddr_node);
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@ -222,9 +201,10 @@ gk20a_instobj_acquire(struct nvkm_memory *memory)
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/* try to free some address space if we reached the limit */
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gk20a_instmem_vaddr_gc(imem, size);
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node->vaddr = imem->cpu_map(memory);
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if (!node->vaddr) {
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/* map the pages */
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node->base.vaddr = vmap(node->pages, size >> PAGE_SHIFT, VM_MAP,
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pgprot_writecombine(PAGE_KERNEL));
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if (!node->base.vaddr) {
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nvkm_error(&imem->base.subdev, "cannot map instobj - "
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"this is not going to end well...\n");
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goto out;
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@ -238,15 +218,25 @@ gk20a_instobj_acquire(struct nvkm_memory *memory)
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node->use_cpt++;
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spin_unlock_irqrestore(&imem->lock, flags);
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return node->vaddr;
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return node->base.vaddr;
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}
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static void
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gk20a_instobj_release(struct nvkm_memory *memory)
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gk20a_instobj_release_dma(struct nvkm_memory *memory)
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{
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struct gk20a_instobj *node = gk20a_instobj(memory);
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struct gk20a_instmem *imem = node->imem;
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struct nvkm_ltc *ltc = imem->base.subdev.device->ltc;
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nvkm_ltc_invalidate(ltc);
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}
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static void
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gk20a_instobj_release_iommu(struct nvkm_memory *memory)
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{
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struct gk20a_instobj_iommu *node = gk20a_instobj_iommu(memory);
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struct gk20a_instmem *imem = node->base.imem;
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struct nvkm_ltc *ltc = imem->base.subdev.device->ltc;
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unsigned long flags;
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spin_lock_irqsave(&imem->lock, flags);
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@ -290,27 +280,6 @@ gk20a_instobj_map(struct nvkm_memory *memory, struct nvkm_vma *vma, u64 offset)
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nvkm_vm_map_at(vma, offset, &node->mem);
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}
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/*
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* Clear the CPU mapping of an instobj if it exists
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*/
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static void
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gk20a_instobj_dtor(struct gk20a_instobj *node)
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{
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struct gk20a_instmem *imem = node->imem;
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unsigned long flags;
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spin_lock_irqsave(&imem->lock, flags);
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/* vaddr has already been recycled */
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if (!node->vaddr)
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goto out;
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gk20a_instobj_recycle_vaddr(node);
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out:
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spin_unlock_irqrestore(&imem->lock, flags);
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}
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static void *
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gk20a_instobj_dtor_dma(struct nvkm_memory *memory)
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{
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@ -318,12 +287,10 @@ gk20a_instobj_dtor_dma(struct nvkm_memory *memory)
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struct gk20a_instmem *imem = node->base.imem;
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struct device *dev = imem->base.subdev.device->dev;
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gk20a_instobj_dtor(&node->base);
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if (unlikely(!node->cpuaddr))
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if (unlikely(!node->base.vaddr))
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goto out;
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dma_free_attrs(dev, node->base.mem.size << PAGE_SHIFT, node->cpuaddr,
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dma_free_attrs(dev, node->base.mem.size << PAGE_SHIFT, node->base.vaddr,
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node->handle, &imem->attrs);
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out:
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@ -337,13 +304,20 @@ gk20a_instobj_dtor_iommu(struct nvkm_memory *memory)
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struct gk20a_instmem *imem = node->base.imem;
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struct device *dev = imem->base.subdev.device->dev;
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struct nvkm_mm_node *r;
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unsigned long flags;
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int i;
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gk20a_instobj_dtor(&node->base);
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if (unlikely(list_empty(&node->base.mem.regions)))
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goto out;
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spin_lock_irqsave(&imem->lock, flags);
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/* vaddr has already been recycled */
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if (node->base.vaddr)
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gk20a_instobj_iommu_recycle_vaddr(node);
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spin_unlock_irqrestore(&imem->lock, flags);
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r = list_first_entry(&node->base.mem.regions, struct nvkm_mm_node,
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rl_entry);
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@ -374,8 +348,8 @@ gk20a_instobj_func_dma = {
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.target = gk20a_instobj_target,
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.addr = gk20a_instobj_addr,
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.size = gk20a_instobj_size,
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.acquire = gk20a_instobj_acquire,
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.release = gk20a_instobj_release,
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.acquire = gk20a_instobj_acquire_dma,
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.release = gk20a_instobj_release_dma,
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.rd32 = gk20a_instobj_rd32,
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.wr32 = gk20a_instobj_wr32,
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.map = gk20a_instobj_map,
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@ -387,8 +361,8 @@ gk20a_instobj_func_iommu = {
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.target = gk20a_instobj_target,
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.addr = gk20a_instobj_addr,
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.size = gk20a_instobj_size,
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.acquire = gk20a_instobj_acquire,
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.release = gk20a_instobj_release,
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.acquire = gk20a_instobj_acquire_iommu,
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.release = gk20a_instobj_release_iommu,
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.rd32 = gk20a_instobj_rd32,
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.wr32 = gk20a_instobj_wr32,
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.map = gk20a_instobj_map,
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@ -408,10 +382,10 @@ gk20a_instobj_ctor_dma(struct gk20a_instmem *imem, u32 npages, u32 align,
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nvkm_memory_ctor(&gk20a_instobj_func_dma, &node->base.memory);
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node->cpuaddr = dma_alloc_attrs(dev, npages << PAGE_SHIFT,
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&node->handle, GFP_KERNEL,
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&imem->attrs);
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if (!node->cpuaddr) {
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node->base.vaddr = dma_alloc_attrs(dev, npages << PAGE_SHIFT,
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&node->handle, GFP_KERNEL,
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&imem->attrs);
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if (!node->base.vaddr) {
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nvkm_error(subdev, "cannot allocate DMA memory\n");
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return -ENOMEM;
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}
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@ -617,18 +591,14 @@ gk20a_instmem_new(struct nvkm_device *device, int index,
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imem->mm = &tdev->iommu.mm;
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imem->domain = tdev->iommu.domain;
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imem->iommu_pgshift = tdev->iommu.pgshift;
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imem->cpu_map = gk20a_instobj_cpu_map_iommu;
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imem->iommu_bit = tdev->func->iommu_bit;
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nvkm_info(&imem->base.subdev, "using IOMMU\n");
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} else {
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init_dma_attrs(&imem->attrs);
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/* We will access the memory through our own mapping */
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dma_set_attr(DMA_ATTR_NON_CONSISTENT, &imem->attrs);
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dma_set_attr(DMA_ATTR_WEAK_ORDERING, &imem->attrs);
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dma_set_attr(DMA_ATTR_WRITE_COMBINE, &imem->attrs);
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dma_set_attr(DMA_ATTR_NO_KERNEL_MAPPING, &imem->attrs);
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imem->cpu_map = gk20a_instobj_cpu_map_dma;
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nvkm_info(&imem->base.subdev, "using DMA API\n");
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}
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