drm/nouveau/instmem: completely new implementation, as a subdev module

v2 (Ben Skeggs):
- some fixes for 64KiB PAGE_SIZE
- fix porting issues in (currently unused) nv41/nv44 pciegart code

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

1 files changed, 14 insertions, 301 deletions

diff --git a/drivers/gpu/drm/nouveau/nouveau_sgdma.c b/drivers/gpu/drm/nouveau/nouveau_sgdma.c
index 38483a0..464beda 100644
--- a/drivers/gpu/drm/nouveau/nouveau_sgdma.c
+++ b/drivers/gpu/drm/nouveau/nouveau_sgdma.c
@@ -13,7 +13,7 @@ struct nouveau_sgdma_be {
 	 */
 	struct ttm_dma_tt ttm;
 	struct drm_device *dev;
-	u64 offset;
+	struct nouveau_mem *node;
 };
 
 static void
@@ -32,25 +32,18 @@ static int
 nv04_sgdma_bind(struct ttm_tt *ttm, struct ttm_mem_reg *mem)
 {
 	struct nouveau_sgdma_be *nvbe = (struct nouveau_sgdma_be *)ttm;
-	struct drm_device *dev = nvbe->dev;
-	struct drm_nouveau_private *dev_priv = dev->dev_private;
-	struct nouveau_gpuobj *gpuobj = dev_priv->gart_info.sg_ctxdma;
-	unsigned i, j, pte;
-
-	NV_DEBUG(dev, "pg=0x%lx\n", mem->start);
-
-	nvbe->offset = mem->start << PAGE_SHIFT;
-	pte = (nvbe->offset >> NV_CTXDMA_PAGE_SHIFT) + 2;
-	for (i = 0; i < ttm->num_pages; i++) {
-		dma_addr_t dma_offset = nvbe->ttm.dma_address[i];
-		uint32_t offset_l = lower_32_bits(dma_offset);
+	struct nouveau_mem *node = mem->mm_node;
+	u64 size = mem->num_pages << 12;
 
-		for (j = 0; j < PAGE_SIZE / NV_CTXDMA_PAGE_SIZE; j++, pte++) {
-			nv_wo32(gpuobj, (pte * 4) + 0, offset_l | 3);
-			offset_l += NV_CTXDMA_PAGE_SIZE;
-		}
+	if (ttm->sg) {
+		node->sg = ttm->sg;
+		nouveau_vm_map_sg_table(&node->vma[0], 0, size, node);
+	} else {
+		node->pages = nvbe->ttm.dma_address;
+		nouveau_vm_map_sg(&node->vma[0], 0, size, node);
 	}
 
+	nvbe->node = node;
 	return 0;
 }
 
@@ -58,22 +51,7 @@ static int
 nv04_sgdma_unbind(struct ttm_tt *ttm)
 {
 	struct nouveau_sgdma_be *nvbe = (struct nouveau_sgdma_be *)ttm;
-	struct drm_device *dev = nvbe->dev;
-	struct drm_nouveau_private *dev_priv = dev->dev_private;
-	struct nouveau_gpuobj *gpuobj = dev_priv->gart_info.sg_ctxdma;
-	unsigned i, j, pte;
-
-	NV_DEBUG(dev, "\n");
-
-	if (ttm->state != tt_bound)
-		return 0;
-
-	pte = (nvbe->offset >> NV_CTXDMA_PAGE_SHIFT) + 2;
-	for (i = 0; i < ttm->num_pages; i++) {
-		for (j = 0; j < PAGE_SIZE / NV_CTXDMA_PAGE_SIZE; j++, pte++)
-			nv_wo32(gpuobj, (pte * 4) + 0, 0x00000000);
-	}
-
+	nouveau_vm_unmap(&nvbe->node->vma[0]);
 	return 0;
 }
 
@@ -83,206 +61,6 @@ static struct ttm_backend_func nv04_sgdma_backend = {
 	.destroy		= nouveau_sgdma_destroy
 };
 
-static void
-nv41_sgdma_flush(struct nouveau_sgdma_be *nvbe)
-{
-	struct drm_device *dev = nvbe->dev;
-
-	nv_wr32(dev, 0x100810, 0x00000022);
-	if (!nv_wait(dev, 0x100810, 0x00000100, 0x00000100))
-		NV_ERROR(dev, "vm flush timeout: 0x%08x\n",
-			 nv_rd32(dev, 0x100810));
-	nv_wr32(dev, 0x100810, 0x00000000);
-}
-
-static int
-nv41_sgdma_bind(struct ttm_tt *ttm, struct ttm_mem_reg *mem)
-{
-	struct nouveau_sgdma_be *nvbe = (struct nouveau_sgdma_be *)ttm;
-	struct drm_nouveau_private *dev_priv = nvbe->dev->dev_private;
-	struct nouveau_gpuobj *pgt = dev_priv->gart_info.sg_ctxdma;
-	dma_addr_t *list = nvbe->ttm.dma_address;
-	u32 pte = mem->start << 2;
-	u32 cnt = ttm->num_pages;
-
-	nvbe->offset = mem->start << PAGE_SHIFT;
-
-	while (cnt--) {
-		nv_wo32(pgt, pte, (*list++ >> 7) | 1);
-		pte += 4;
-	}
-
-	nv41_sgdma_flush(nvbe);
-	return 0;
-}
-
-static int
-nv41_sgdma_unbind(struct ttm_tt *ttm)
-{
-	struct nouveau_sgdma_be *nvbe = (struct nouveau_sgdma_be *)ttm;
-	struct drm_nouveau_private *dev_priv = nvbe->dev->dev_private;
-	struct nouveau_gpuobj *pgt = dev_priv->gart_info.sg_ctxdma;
-	u32 pte = (nvbe->offset >> 12) << 2;
-	u32 cnt = ttm->num_pages;
-
-	while (cnt--) {
-		nv_wo32(pgt, pte, 0x00000000);
-		pte += 4;
-	}
-
-	nv41_sgdma_flush(nvbe);
-	return 0;
-}
-
-static struct ttm_backend_func nv41_sgdma_backend = {
-	.bind			= nv41_sgdma_bind,
-	.unbind			= nv41_sgdma_unbind,
-	.destroy		= nouveau_sgdma_destroy
-};
-
-static void
-nv44_sgdma_flush(struct ttm_tt *ttm)
-{
-	struct nouveau_sgdma_be *nvbe = (struct nouveau_sgdma_be *)ttm;
-	struct drm_device *dev = nvbe->dev;
-
-	nv_wr32(dev, 0x100814, (ttm->num_pages - 1) << 12);
-	nv_wr32(dev, 0x100808, nvbe->offset | 0x20);
-	if (!nv_wait(dev, 0x100808, 0x00000001, 0x00000001))
-		NV_ERROR(dev, "gart flush timeout: 0x%08x\n",
-			 nv_rd32(dev, 0x100808));
-	nv_wr32(dev, 0x100808, 0x00000000);
-}
-
-static void
-nv44_sgdma_fill(struct nouveau_gpuobj *pgt, dma_addr_t *list, u32 base, u32 cnt)
-{
-	struct drm_nouveau_private *dev_priv = pgt->dev->dev_private;
-	dma_addr_t dummy = dev_priv->gart_info.dummy.addr;
-	u32 pte, tmp[4];
-
-	pte   = base >> 2;
-	base &= ~0x0000000f;
-
-	tmp[0] = nv_ro32(pgt, base + 0x0);
-	tmp[1] = nv_ro32(pgt, base + 0x4);
-	tmp[2] = nv_ro32(pgt, base + 0x8);
-	tmp[3] = nv_ro32(pgt, base + 0xc);
-	while (cnt--) {
-		u32 addr = list ? (*list++ >> 12) : (dummy >> 12);
-		switch (pte++ & 0x3) {
-		case 0:
-			tmp[0] &= ~0x07ffffff;
-			tmp[0] |= addr;
-			break;
-		case 1:
-			tmp[0] &= ~0xf8000000;
-			tmp[0] |= addr << 27;
-			tmp[1] &= ~0x003fffff;
-			tmp[1] |= addr >> 5;
-			break;
-		case 2:
-			tmp[1] &= ~0xffc00000;
-			tmp[1] |= addr << 22;
-			tmp[2] &= ~0x0001ffff;
-			tmp[2] |= addr >> 10;
-			break;
-		case 3:
-			tmp[2] &= ~0xfffe0000;
-			tmp[2] |= addr << 17;
-			tmp[3] &= ~0x00000fff;
-			tmp[3] |= addr >> 15;
-			break;
-		}
-	}
-
-	tmp[3] |= 0x40000000;
-
-	nv_wo32(pgt, base + 0x0, tmp[0]);
-	nv_wo32(pgt, base + 0x4, tmp[1]);
-	nv_wo32(pgt, base + 0x8, tmp[2]);
-	nv_wo32(pgt, base + 0xc, tmp[3]);
-}
-
-static int
-nv44_sgdma_bind(struct ttm_tt *ttm, struct ttm_mem_reg *mem)
-{
-	struct nouveau_sgdma_be *nvbe = (struct nouveau_sgdma_be *)ttm;
-	struct drm_nouveau_private *dev_priv = nvbe->dev->dev_private;
-	struct nouveau_gpuobj *pgt = dev_priv->gart_info.sg_ctxdma;
-	dma_addr_t *list = nvbe->ttm.dma_address;
-	u32 pte = mem->start << 2, tmp[4];
-	u32 cnt = ttm->num_pages;
-	int i;
-
-	nvbe->offset = mem->start << PAGE_SHIFT;
-
-	if (pte & 0x0000000c) {
-		u32  max = 4 - ((pte >> 2) & 0x3);
-		u32 part = (cnt > max) ? max : cnt;
-		nv44_sgdma_fill(pgt, list, pte, part);
-		pte  += (part << 2);
-		list += part;
-		cnt  -= part;
-	}
-
-	while (cnt >= 4) {
-		for (i = 0; i < 4; i++)
-			tmp[i] = *list++ >> 12;
-		nv_wo32(pgt, pte + 0x0, tmp[0] >>  0 | tmp[1] << 27);
-		nv_wo32(pgt, pte + 0x4, tmp[1] >>  5 | tmp[2] << 22);
-		nv_wo32(pgt, pte + 0x8, tmp[2] >> 10 | tmp[3] << 17);
-		nv_wo32(pgt, pte + 0xc, tmp[3] >> 15 | 0x40000000);
-		pte  += 0x10;
-		cnt  -= 4;
-	}
-
-	if (cnt)
-		nv44_sgdma_fill(pgt, list, pte, cnt);
-
-	nv44_sgdma_flush(ttm);
-	return 0;
-}
-
-static int
-nv44_sgdma_unbind(struct ttm_tt *ttm)
-{
-	struct nouveau_sgdma_be *nvbe = (struct nouveau_sgdma_be *)ttm;
-	struct drm_nouveau_private *dev_priv = nvbe->dev->dev_private;
-	struct nouveau_gpuobj *pgt = dev_priv->gart_info.sg_ctxdma;
-	u32 pte = (nvbe->offset >> 12) << 2;
-	u32 cnt = ttm->num_pages;
-
-	if (pte & 0x0000000c) {
-		u32  max = 4 - ((pte >> 2) & 0x3);
-		u32 part = (cnt > max) ? max : cnt;
-		nv44_sgdma_fill(pgt, NULL, pte, part);
-		pte  += (part << 2);
-		cnt  -= part;
-	}
-
-	while (cnt >= 4) {
-		nv_wo32(pgt, pte + 0x0, 0x00000000);
-		nv_wo32(pgt, pte + 0x4, 0x00000000);
-		nv_wo32(pgt, pte + 0x8, 0x00000000);
-		nv_wo32(pgt, pte + 0xc, 0x00000000);
-		pte  += 0x10;
-		cnt  -= 4;
-	}
-
-	if (cnt)
-		nv44_sgdma_fill(pgt, NULL, pte, cnt);
-
-	nv44_sgdma_flush(ttm);
-	return 0;
-}
-
-static struct ttm_backend_func nv44_sgdma_backend = {
-	.bind			= nv44_sgdma_bind,
-	.unbind			= nv44_sgdma_unbind,
-	.destroy		= nouveau_sgdma_destroy
-};
-
 static int
 nv50_sgdma_bind(struct ttm_tt *ttm, struct ttm_mem_reg *mem)
 {
@@ -337,82 +115,24 @@ int
 nouveau_sgdma_init(struct drm_device *dev)
 {
 	struct drm_nouveau_private *dev_priv = dev->dev_private;
-	struct nouveau_gpuobj *gpuobj = NULL;
-	u32 aper_size, align;
-	int ret;
+	u32 aper_size;
 
-	if (dev_priv->card_type >= NV_40)
+	if (dev_priv->card_type >= NV_50)
 		aper_size = 512 * 1024 * 1024;
 	else
 		aper_size = 128 * 1024 * 1024;
 
-	/* Dear NVIDIA, NV44+ would like proper present bits in PTEs for
-	 * christmas.  The cards before it have them, the cards after
-	 * it have them, why is NV44 so unloved?
-	 */
-	dev_priv->gart_info.dummy.page = alloc_page(GFP_DMA32 | GFP_KERNEL);
-	if (!dev_priv->gart_info.dummy.page)
-		return -ENOMEM;
-
-	dev_priv->gart_info.dummy.addr =
-		pci_map_page(dev->pdev, dev_priv->gart_info.dummy.page,
-			     0, PAGE_SIZE, PCI_DMA_BIDIRECTIONAL);
-	if (pci_dma_mapping_error(dev->pdev, dev_priv->gart_info.dummy.addr)) {
-		NV_ERROR(dev, "error mapping dummy page\n");
-		__free_page(dev_priv->gart_info.dummy.page);
-		dev_priv->gart_info.dummy.page = NULL;
-		return -ENOMEM;
-	}
-
 	if (dev_priv->card_type >= NV_50) {
 		dev_priv->gart_info.aper_base = 0;
 		dev_priv->gart_info.aper_size = aper_size;
 		dev_priv->gart_info.type = NOUVEAU_GART_HW;
 		dev_priv->gart_info.func = &nv50_sgdma_backend;
-	} else
-	if (0 && pci_is_pcie(dev->pdev) &&
-	    dev_priv->chipset > 0x40 && dev_priv->chipset != 0x45) {
-		if (nv44_graph_class(dev)) {
-			dev_priv->gart_info.func = &nv44_sgdma_backend;
-			align = 512 * 1024;
-		} else {
-			dev_priv->gart_info.func = &nv41_sgdma_backend;
-			align = 16;
-		}
-
-		ret = nouveau_gpuobj_new(dev, NULL, aper_size / 1024, align,
-					 NVOBJ_FLAG_ZERO_ALLOC |
-					 NVOBJ_FLAG_ZERO_FREE, &gpuobj);
-		if (ret) {
-			NV_ERROR(dev, "Error creating sgdma object: %d\n", ret);
-			return ret;
-		}
-
-		dev_priv->gart_info.sg_ctxdma = gpuobj;
-		dev_priv->gart_info.aper_base = 0;
-		dev_priv->gart_info.aper_size = aper_size;
-		dev_priv->gart_info.type = NOUVEAU_GART_HW;
 	} else {
-		ret = nouveau_gpuobj_new(dev, NULL, (aper_size / 1024) + 8, 16,
-					 NVOBJ_FLAG_ZERO_ALLOC |
-					 NVOBJ_FLAG_ZERO_FREE, &gpuobj);
-		if (ret) {
-			NV_ERROR(dev, "Error creating sgdma object: %d\n", ret);
-			return ret;
-		}
-
-		nv_wo32(gpuobj, 0, NV_CLASS_DMA_IN_MEMORY |
-				   (1 << 12) /* PT present */ |
-				   (0 << 13) /* PT *not* linear */ |
-				   (0 << 14) /* RW */ |
-				   (2 << 16) /* PCI */);
-		nv_wo32(gpuobj, 4, aper_size - 1);
-
-		dev_priv->gart_info.sg_ctxdma = gpuobj;
 		dev_priv->gart_info.aper_base = 0;
 		dev_priv->gart_info.aper_size = aper_size;
 		dev_priv->gart_info.type = NOUVEAU_GART_PDMA;
 		dev_priv->gart_info.func = &nv04_sgdma_backend;
+		dev_priv->gart_info.sg_ctxdma = nv04vm_refdma(dev);
 	}
 
 	return 0;
@@ -424,13 +144,6 @@ nouveau_sgdma_takedown(struct drm_device *dev)
 	struct drm_nouveau_private *dev_priv = dev->dev_private;
 
 	nouveau_gpuobj_ref(NULL, &dev_priv->gart_info.sg_ctxdma);
-
-	if (dev_priv->gart_info.dummy.page) {
-		pci_unmap_page(dev->pdev, dev_priv->gart_info.dummy.addr,
-			       PAGE_SIZE, PCI_DMA_BIDIRECTIONAL);
-		__free_page(dev_priv->gart_info.dummy.page);
-		dev_priv->gart_info.dummy.page = NULL;
-	}
 }
 
 uint32_t