drm/nv50-nvc0/vm: support unsnooped system memory

v2 (Emil Velikov <emil.l.velikov@gmail.com>):
- Fixed a regression on certain nv50 IGP due to not passing the correct
  target type to nv50_vm_addr()

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
Signed-off-by: Emil Velikov <emil.l.velikov@gmail.com>
Tested-by: Johannes Obermayr <johannesobermayr@gmx.de>

diff --git a/drivers/gpu/drm/nouveau/nouveau_drv.h b/drivers/gpu/drm/nouveau/nouveau_drv.h
index 63e77fc..3a69a4a 100644 (file)
--- a/drivers/gpu/drm/nouveau/nouveau_drv.h
+++ b/drivers/gpu/drm/nouveau/nouveau_drv.h
@@ -1759,6 +1759,7 @@ nv44_graph_class(struct drm_device *dev)
 #define NV_MEM_ACCESS_RW (NV_MEM_ACCESS_RO | NV_MEM_ACCESS_WO)
 #define NV_MEM_ACCESS_SYS 4
 #define NV_MEM_ACCESS_VM  8
+#define NV_MEM_ACCESS_NOSNOOP 16
 
 #define NV_MEM_TARGET_VRAM        0
 #define NV_MEM_TARGET_PCI         1

diff --git a/drivers/gpu/drm/nouveau/nv50_vm.c b/drivers/gpu/drm/nouveau/nv50_vm.c
index 6f38cea..44fbac9 100644 (file)
--- a/drivers/gpu/drm/nouveau/nv50_vm.c
+++ b/drivers/gpu/drm/nouveau/nv50_vm.c
@@ -57,27 +57,15 @@ nv50_vm_map_pgt(struct nouveau_gpuobj *pgd, u32 pde,
 }
 
 static inline u64
-nv50_vm_addr(struct nouveau_vma *vma, u64 phys, u32 memtype, u32 target)
+vm_addr(struct nouveau_vma *vma, u64 phys, u32 memtype, u32 target)
 {
-       struct drm_nouveau_private *dev_priv = vma->vm->dev->dev_private;
-
        phys |= 1; /* present */
        phys |= (u64)memtype << 40;
-
-       /* IGPs don't have real VRAM, re-target to stolen system memory */
-       if (target == 0 && dev_priv->vram_sys_base) {
-               phys  += dev_priv->vram_sys_base;
-               target = 3;
-       }
-
        phys |= target << 4;
-
        if (vma->access & NV_MEM_ACCESS_SYS)
                phys |= (1 << 6);
-
        if (!(vma->access & NV_MEM_ACCESS_WO))
                phys |= (1 << 3);
-
        return phys;
 }
 
@@ -85,11 +73,19 @@ void
 nv50_vm_map(struct nouveau_vma *vma, struct nouveau_gpuobj *pgt,
            struct nouveau_mem *mem, u32 pte, u32 cnt, u64 phys, u64 delta)
 {
+       struct drm_nouveau_private *dev_priv = vma->vm->dev->dev_private;
        u32 comp = (mem->memtype & 0x180) >> 7;
-       u32 block;
+       u32 block, target;
        int i;
 
-       phys  = nv50_vm_addr(vma, phys, mem->memtype, 0);
+       /* IGPs don't have real VRAM, re-target to stolen system memory */
+       target = 0;
+       if (dev_priv->vram_sys_base) {
+               phys += dev_priv->vram_sys_base;
+               target = 3;
+       }
+
+       phys  = vm_addr(vma, phys, mem->memtype, target);
        pte <<= 3;
        cnt <<= 3;
 
@@ -125,9 +121,10 @@ void
 nv50_vm_map_sg(struct nouveau_vma *vma, struct nouveau_gpuobj *pgt,
               struct nouveau_mem *mem, u32 pte, u32 cnt, dma_addr_t *list)
 {
+       u32 target = (vma->access & NV_MEM_ACCESS_NOSNOOP) ? 3 : 2;
        pte <<= 3;
        while (cnt--) {
-               u64 phys = nv50_vm_addr(vma, (u64)*list++, mem->memtype, 2);
+               u64 phys = vm_addr(vma, (u64)*list++, mem->memtype, target);
                nv_wo32(pgt, pte + 0, lower_32_bits(phys));
                nv_wo32(pgt, pte + 4, upper_32_bits(phys));
                pte += 8;

diff --git a/drivers/gpu/drm/nouveau/nvc0_vm.c b/drivers/gpu/drm/nouveau/nvc0_vm.c
index 9e35294..30d2bd5 100644 (file)
--- a/drivers/gpu/drm/nouveau/nvc0_vm.c
+++ b/drivers/gpu/drm/nouveau/nvc0_vm.c
@@ -77,9 +77,11 @@ void
 nvc0_vm_map_sg(struct nouveau_vma *vma, struct nouveau_gpuobj *pgt,
               struct nouveau_mem *mem, u32 pte, u32 cnt, dma_addr_t *list)
 {
+       u32 target = (vma->access & NV_MEM_ACCESS_NOSNOOP) ? 7 : 5;
+
        pte <<= 3;
        while (cnt--) {
-               u64 phys = nvc0_vm_addr(vma, *list++, mem->memtype, 5);
+               u64 phys = nvc0_vm_addr(vma, *list++, mem->memtype, target);
                nv_wo32(pgt, pte + 0, lower_32_bits(phys));
                nv_wo32(pgt, pte + 4, upper_32_bits(phys));
                pte += 8;