Commit 4c27bd33 authored by Ben Skeggs's avatar Ben Skeggs
Browse files

drm/nv50: more efficient clearing of gpu page table entries 



Signed-off-by: default avatarBen Skeggs <bskeggs@redhat.com>
parent 66b6ebac

drivers/gpu/drm/nouveau/nouveau_mem.c

+44 −24
Original line number Diff line number Diff line
@@ -291,21 +291,8 @@ nv50_mem_vm_bind_linear(struct drm_device *dev, uint64_t virt, uint32_t size, 
	pages = size >> 16;



	dev_priv->engine.instmem.prepare_access(dev, true);

	if (flags & 0x80000000) {

	while (pages--) {

			struct nouveau_gpuobj *pt =

				dev_priv->vm_vram_pt[virt >> 29];

			unsigned pte = ((virt & 0x1fffffffULL) >> 16) << 1;



			nv_wo32(dev, pt, pte++, 0x00000000);

			nv_wo32(dev, pt, pte++, 0x00000000);



			virt += (1 << 16);

		}

	} else {

		while (pages--) {

			struct nouveau_gpuobj *pt =

				dev_priv->vm_vram_pt[virt >> 29];

		struct nouveau_gpuobj *pt = dev_priv->vm_vram_pt[virt >> 29];

		unsigned pte = ((virt & 0x1fffffffULL) >> 16) << 1;

		unsigned offset_h = upper_32_bits(phys) & 0xff;

		unsigned offset_l = lower_32_bits(phys);
@@ -316,7 +303,6 @@ nv50_mem_vm_bind_linear(struct drm_device *dev, uint64_t virt, uint32_t size, 
		phys += (1 << 16);

		virt += (1 << 16);

	}

	}

	dev_priv->engine.instmem.finish_access(dev);



	nv_wr32(dev, 0x100c80, 0x00050001);
@@ -339,7 +325,41 @@ nv50_mem_vm_bind_linear(struct drm_device *dev, uint64_t virt, uint32_t size, 
void

nv50_mem_vm_unbind(struct drm_device *dev, uint64_t virt, uint32_t size)

{

	nv50_mem_vm_bind_linear(dev, virt, size, 0x80000000, 0);

	struct drm_nouveau_private *dev_priv = dev->dev_private;

	struct nouveau_gpuobj *pgt;

	unsigned pages, pte, end;



	virt -= dev_priv->vm_vram_base;

	pages = (size >> 16) << 1;



	dev_priv->engine.instmem.prepare_access(dev, true);

	while (pages) {

		pgt = dev_priv->vm_vram_pt[virt >> 29];

		pte = (virt & 0x1ffe0000ULL) >> 15;



		end = pte + pages;

		if (end > 16384)

			end = 16384;

		pages -= (end - pte);

		virt  += (end - pte) << 15;



		while (pte < end)

			nv_wo32(dev, pgt, pte++, 0);

	}

	dev_priv->engine.instmem.finish_access(dev);



	nv_wr32(dev, 0x100c80, 0x00050001);

	if (!nv_wait(0x100c80, 0x00000001, 0x00000000)) {

		NV_ERROR(dev, "timeout: (0x100c80 & 1) == 0 (2)\n");

		NV_ERROR(dev, "0x100c80 = 0x%08x\n", nv_rd32(dev, 0x100c80));

		return;

	}



	nv_wr32(dev, 0x100c80, 0x00000001);

	if (!nv_wait(0x100c80, 0x00000001, 0x00000000)) {

		NV_ERROR(dev, "timeout: (0x100c80 & 1) == 0 (2)\n");

		NV_ERROR(dev, "0x100c80 = 0x%08x\n", nv_rd32(dev, 0x100c80));

	}

}



/*