drm/nouveau: teach nouveau_bo_pin() how to force a contig vram allocation

We have the ability to move buffers around in the kernel if necessary,
and should probably use it rather than failing if userspace passes us
a non-contig buffer for a plane.

The NOUVEAU_GEM_TILE_NONCONTIG flag from userspace will become a mere
initial placement hint once all the relevant paths have been updated.

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

13 files changed, 52 insertions, 27 deletions

diff --git a/drivers/gpu/drm/nouveau/dispnv04/crtc.c b/drivers/gpu/drm/nouveau/dispnv04/crtc.c
index 2a03e77abef4..38402ade6835 100644
--- a/drivers/gpu/drm/nouveau/dispnv04/crtc.c
+++ b/drivers/gpu/drm/nouveau/dispnv04/crtc.c
@@ -614,7 +614,7 @@ nv_crtc_swap_fbs(struct drm_crtc *crtc, struct drm_framebuffer *old_fb)
         struct nouveau_crtc *nv_crtc = nouveau_crtc(crtc);
         int ret;
 
-        ret = nouveau_bo_pin(nvfb->nvbo, TTM_PL_FLAG_VRAM);
+        ret = nouveau_bo_pin(nvfb->nvbo, TTM_PL_FLAG_VRAM, false);
         if (ret == 0) {
                 if (disp->image[nv_crtc->index])
                         nouveau_bo_unpin(disp->image[nv_crtc->index]);
@@ -1130,7 +1130,7 @@ nv04_crtc_create(struct drm_device *dev, int crtc_num)
         ret = nouveau_bo_new(dev, 64*64*4, 0x100, TTM_PL_FLAG_VRAM,
                              0, 0x0000, NULL, NULL, &nv_crtc->cursor.nvbo);
         if (!ret) {
-                ret = nouveau_bo_pin(nv_crtc->cursor.nvbo, TTM_PL_FLAG_VRAM);
+                ret = nouveau_bo_pin(nv_crtc->cursor.nvbo, TTM_PL_FLAG_VRAM, false);
                 if (!ret) {
                         ret = nouveau_bo_map(nv_crtc->cursor.nvbo);
                         if (ret)
diff --git a/drivers/gpu/drm/nouveau/dispnv04/overlay.c b/drivers/gpu/drm/nouveau/dispnv04/overlay.c
index 1e9056a8df94..9f2498571d09 100644
--- a/drivers/gpu/drm/nouveau/dispnv04/overlay.c
+++ b/drivers/gpu/drm/nouveau/dispnv04/overlay.c
@@ -126,7 +126,7 @@ nv10_update_plane(struct drm_plane *plane, struct drm_crtc *crtc,
                         return -ERANGE;
         }
 
-        ret = nouveau_bo_pin(nv_fb->nvbo, TTM_PL_FLAG_VRAM);
+        ret = nouveau_bo_pin(nv_fb->nvbo, TTM_PL_FLAG_VRAM, false);
         if (ret)
                 return ret;
 
@@ -373,7 +373,7 @@ nv04_update_plane(struct drm_plane *plane, struct drm_crtc *crtc,
         if (crtc_w < src_w || crtc_h < src_h)
                 return -ERANGE;
 
-        ret = nouveau_bo_pin(nv_fb->nvbo, TTM_PL_FLAG_VRAM);
+        ret = nouveau_bo_pin(nv_fb->nvbo, TTM_PL_FLAG_VRAM, false);
         if (ret)
                 return ret;
 
diff --git a/drivers/gpu/drm/nouveau/nouveau_abi16.c b/drivers/gpu/drm/nouveau/nouveau_abi16.c
index a24faa5e2a2a..d39a15000068 100644
--- a/drivers/gpu/drm/nouveau/nouveau_abi16.c
+++ b/drivers/gpu/drm/nouveau/nouveau_abi16.c
@@ -308,7 +308,7 @@ nouveau_abi16_ioctl_channel_alloc(ABI16_IOCTL_ARGS)
         ret = nouveau_gem_new(dev, PAGE_SIZE, 0, NOUVEAU_GEM_DOMAIN_GART,
                               0, 0, &chan->ntfy);
         if (ret == 0)
-                ret = nouveau_bo_pin(chan->ntfy, TTM_PL_FLAG_TT);
+                ret = nouveau_bo_pin(chan->ntfy, TTM_PL_FLAG_TT, false);
         if (ret)
                 goto done;
 
diff --git a/drivers/gpu/drm/nouveau/nouveau_bo.c b/drivers/gpu/drm/nouveau/nouveau_bo.c
index 5ece6efeab80..21ec561edc99 100644
--- a/drivers/gpu/drm/nouveau/nouveau_bo.c
+++ b/drivers/gpu/drm/nouveau/nouveau_bo.c
@@ -310,26 +310,49 @@ nouveau_bo_placement_set(struct nouveau_bo *nvbo, uint32_t type, uint32_t busy)
 }
 
 int
-nouveau_bo_pin(struct nouveau_bo *nvbo, uint32_t memtype)
+nouveau_bo_pin(struct nouveau_bo *nvbo, uint32_t memtype, bool contig)
 {
         struct nouveau_drm *drm = nouveau_bdev(nvbo->bo.bdev);
         struct ttm_buffer_object *bo = &nvbo->bo;
+        bool force = false, evict = false;
         int ret;
 
         ret = ttm_bo_reserve(bo, false, false, false, NULL);
         if (ret)
                 return ret;
 
-        if (nvbo->pin_refcnt && !(memtype & (1 << bo->mem.mem_type))) {
-                NV_ERROR(drm, "bo %p pinned elsewhere: 0x%08x vs 0x%08x\n", bo,
-                         1 << bo->mem.mem_type, memtype);
-                ret = -EINVAL;
-                goto out;
+        if (drm->device.info.family >= NV_DEVICE_INFO_V0_TESLA &&
+            memtype == TTM_PL_FLAG_VRAM && contig) {
+                if (nvbo->tile_flags & NOUVEAU_GEM_TILE_NONCONTIG) {
+                        if (bo->mem.mem_type == TTM_PL_VRAM) {
+                                struct nouveau_mem *mem = bo->mem.mm_node;
+                                if (!list_is_singular(&mem->regions))
+                                        evict = true;
+                        }
+                        nvbo->tile_flags &= ~NOUVEAU_GEM_TILE_NONCONTIG;
+                        force = true;
+                }
         }
 
-        if (nvbo->pin_refcnt++)
+        if (nvbo->pin_refcnt) {
+                if (!(memtype & (1 << bo->mem.mem_type)) || evict) {
+                        NV_ERROR(drm, "bo %p pinned elsewhere: "
+                                      "0x%08x vs 0x%08x\n", bo,
+                                 1 << bo->mem.mem_type, memtype);
+                        ret = -EBUSY;
+                }
+                nvbo->pin_refcnt++;
                 goto out;
+        }
 
+        if (evict) {
+                nouveau_bo_placement_set(nvbo, TTM_PL_FLAG_TT, 0);
+                ret = nouveau_bo_validate(nvbo, false, false);
+                if (ret)
+                        goto out;
+        }
+
+        nvbo->pin_refcnt++;
         nouveau_bo_placement_set(nvbo, memtype, 0);
 
         /* drop pin_refcnt temporarily, so we don't trip the assertion
@@ -354,6 +377,8 @@ nouveau_bo_pin(struct nouveau_bo *nvbo, uint32_t memtype)
         }
 
 out:
+        if (force && ret)
+                nvbo->tile_flags |= NOUVEAU_GEM_TILE_NONCONTIG;
         ttm_bo_unreserve(bo);
         return ret;
 }
diff --git a/drivers/gpu/drm/nouveau/nouveau_bo.h b/drivers/gpu/drm/nouveau/nouveau_bo.h
index c827f233e41d..072222efeeb7 100644
--- a/drivers/gpu/drm/nouveau/nouveau_bo.h
+++ b/drivers/gpu/drm/nouveau/nouveau_bo.h
@@ -73,7 +73,7 @@ int  nouveau_bo_new(struct drm_device *, int size, int align, u32 flags,
                     u32 tile_mode, u32 tile_flags, struct sg_table *sg,
                     struct reservation_object *robj,
                     struct nouveau_bo **);
-int  nouveau_bo_pin(struct nouveau_bo *, u32 flags);
+int  nouveau_bo_pin(struct nouveau_bo *, u32 flags, bool contig);
 int  nouveau_bo_unpin(struct nouveau_bo *);
 int  nouveau_bo_map(struct nouveau_bo *);
 void nouveau_bo_unmap(struct nouveau_bo *);
diff --git a/drivers/gpu/drm/nouveau/nouveau_chan.c b/drivers/gpu/drm/nouveau/nouveau_chan.c
index 0f3da86840f2..aff9099aae6c 100644
--- a/drivers/gpu/drm/nouveau/nouveau_chan.c
+++ b/drivers/gpu/drm/nouveau/nouveau_chan.c
@@ -109,7 +109,7 @@ nouveau_channel_prep(struct nouveau_drm *drm, struct nvif_device *device,
         ret = nouveau_bo_new(drm->dev, size, 0, target, 0, 0, NULL, NULL,
                             &chan->push.buffer);
         if (ret == 0) {
-                ret = nouveau_bo_pin(chan->push.buffer, target);
+                ret = nouveau_bo_pin(chan->push.buffer, target, false);
                 if (ret == 0)
                         ret = nouveau_bo_map(chan->push.buffer);
         }
diff --git a/drivers/gpu/drm/nouveau/nouveau_display.c b/drivers/gpu/drm/nouveau/nouveau_display.c
index e02ab391c870..f9a0f1dc15f9 100644
--- a/drivers/gpu/drm/nouveau/nouveau_display.c
+++ b/drivers/gpu/drm/nouveau/nouveau_display.c
@@ -592,7 +592,7 @@ nouveau_display_resume(struct drm_device *dev, bool runtime)
                 if (!nouveau_fb || !nouveau_fb->nvbo)
                         continue;
 
-                ret = nouveau_bo_pin(nouveau_fb->nvbo, TTM_PL_FLAG_VRAM);
+                ret = nouveau_bo_pin(nouveau_fb->nvbo, TTM_PL_FLAG_VRAM, false);
                 if (ret)
                         NV_ERROR(drm, "Could not pin framebuffer\n");
         }
@@ -600,7 +600,7 @@ nouveau_display_resume(struct drm_device *dev, bool runtime)
         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
                 struct nouveau_crtc *nv_crtc = nouveau_crtc(crtc);
 
-                ret = nouveau_bo_pin(nv_crtc->cursor.nvbo, TTM_PL_FLAG_VRAM);
+                ret = nouveau_bo_pin(nv_crtc->cursor.nvbo, TTM_PL_FLAG_VRAM, false);
                 if (!ret)
                         ret = nouveau_bo_map(nv_crtc->cursor.nvbo);
                 if (ret)
@@ -713,7 +713,7 @@ nouveau_crtc_page_flip(struct drm_crtc *crtc, struct drm_framebuffer *fb,
                 return -ENOMEM;
 
         if (new_bo != old_bo) {
-                ret = nouveau_bo_pin(new_bo, TTM_PL_FLAG_VRAM);
+                ret = nouveau_bo_pin(new_bo, TTM_PL_FLAG_VRAM, false);
                 if (ret)
                         goto fail_free;
         }
diff --git a/drivers/gpu/drm/nouveau/nouveau_fbcon.c b/drivers/gpu/drm/nouveau/nouveau_fbcon.c
index b3a58b384256..3ed12a8cfc91 100644
--- a/drivers/gpu/drm/nouveau/nouveau_fbcon.c
+++ b/drivers/gpu/drm/nouveau/nouveau_fbcon.c
@@ -341,7 +341,7 @@ nouveau_fbcon_create(struct drm_fb_helper *helper,
                 goto out;
         }
 
-        ret = nouveau_bo_pin(nvbo, TTM_PL_FLAG_VRAM);
+        ret = nouveau_bo_pin(nvbo, TTM_PL_FLAG_VRAM, false);
         if (ret) {
                 NV_ERROR(drm, "failed to pin fb: %d\n", ret);
                 goto out_unref;
diff --git a/drivers/gpu/drm/nouveau/nouveau_prime.c b/drivers/gpu/drm/nouveau/nouveau_prime.c
index 228226ab27fc..dd32ad6db53d 100644
--- a/drivers/gpu/drm/nouveau/nouveau_prime.c
+++ b/drivers/gpu/drm/nouveau/nouveau_prime.c
@@ -93,7 +93,7 @@ int nouveau_gem_prime_pin(struct drm_gem_object *obj)
         int ret;
 
         /* pin buffer into GTT */
-        ret = nouveau_bo_pin(nvbo, TTM_PL_FLAG_TT);
+        ret = nouveau_bo_pin(nvbo, TTM_PL_FLAG_TT, false);
         if (ret)
                 return -EINVAL;
 
diff --git a/drivers/gpu/drm/nouveau/nv17_fence.c b/drivers/gpu/drm/nouveau/nv17_fence.c
index 40b461c7d5c5..57860cfa1de5 100644
--- a/drivers/gpu/drm/nouveau/nv17_fence.c
+++ b/drivers/gpu/drm/nouveau/nv17_fence.c
@@ -131,7 +131,7 @@ nv17_fence_create(struct nouveau_drm *drm)
         ret = nouveau_bo_new(drm->dev, 4096, 0x1000, TTM_PL_FLAG_VRAM,
                              0, 0x0000, NULL, NULL, &priv->bo);
         if (!ret) {
-                ret = nouveau_bo_pin(priv->bo, TTM_PL_FLAG_VRAM);
+                ret = nouveau_bo_pin(priv->bo, TTM_PL_FLAG_VRAM, false);
                 if (!ret) {
                         ret = nouveau_bo_map(priv->bo);
                         if (ret)
diff --git a/drivers/gpu/drm/nouveau/nv50_display.c b/drivers/gpu/drm/nouveau/nv50_display.c
index 2016d8ece028..2b5aefb3b9e5 100644
--- a/drivers/gpu/drm/nouveau/nv50_display.c
+++ b/drivers/gpu/drm/nouveau/nv50_display.c
@@ -1073,7 +1073,7 @@ nv50_crtc_swap_fbs(struct drm_crtc *crtc, struct drm_framebuffer *old_fb)
         struct nv50_head *head = nv50_head(crtc);
         int ret;
 
-        ret = nouveau_bo_pin(nvfb->nvbo, TTM_PL_FLAG_VRAM);
+        ret = nouveau_bo_pin(nvfb->nvbo, TTM_PL_FLAG_VRAM, false);
         if (ret == 0) {
                 if (head->image)
                         nouveau_bo_unpin(head->image);
@@ -1402,7 +1402,7 @@ nv50_crtc_create(struct drm_device *dev, int index)
         ret = nouveau_bo_new(dev, 8192, 0x100, TTM_PL_FLAG_VRAM,
                              0, 0x0000, NULL, NULL, &head->base.lut.nvbo);
         if (!ret) {
-                ret = nouveau_bo_pin(head->base.lut.nvbo, TTM_PL_FLAG_VRAM);
+                ret = nouveau_bo_pin(head->base.lut.nvbo, TTM_PL_FLAG_VRAM, false);
                 if (!ret) {
                         ret = nouveau_bo_map(head->base.lut.nvbo);
                         if (ret)
@@ -1425,7 +1425,7 @@ nv50_crtc_create(struct drm_device *dev, int index)
         ret = nouveau_bo_new(dev, 64 * 64 * 4, 0x100, TTM_PL_FLAG_VRAM,
                              0, 0x0000, NULL, NULL, &head->base.cursor.nvbo);
         if (!ret) {
-                ret = nouveau_bo_pin(head->base.cursor.nvbo, TTM_PL_FLAG_VRAM);
+                ret = nouveau_bo_pin(head->base.cursor.nvbo, TTM_PL_FLAG_VRAM, false);
                 if (!ret) {
                         ret = nouveau_bo_map(head->base.cursor.nvbo);
                         if (ret)
@@ -2487,7 +2487,7 @@ nv50_display_create(struct drm_device *dev)
         ret = nouveau_bo_new(dev, 4096, 0x1000, TTM_PL_FLAG_VRAM,
                              0, 0x0000, NULL, NULL, &disp->sync);
         if (!ret) {
-                ret = nouveau_bo_pin(disp->sync, TTM_PL_FLAG_VRAM);
+                ret = nouveau_bo_pin(disp->sync, TTM_PL_FLAG_VRAM, false);
                 if (!ret) {
                         ret = nouveau_bo_map(disp->sync);
                         if (ret)
diff --git a/drivers/gpu/drm/nouveau/nv50_fence.c b/drivers/gpu/drm/nouveau/nv50_fence.c
index 22d242b37962..a82d9ea7c6fd 100644
--- a/drivers/gpu/drm/nouveau/nv50_fence.c
+++ b/drivers/gpu/drm/nouveau/nv50_fence.c
@@ -102,7 +102,7 @@ nv50_fence_create(struct nouveau_drm *drm)
         ret = nouveau_bo_new(drm->dev, 4096, 0x1000, TTM_PL_FLAG_VRAM,
                              0, 0x0000, NULL, NULL, &priv->bo);
         if (!ret) {
-                ret = nouveau_bo_pin(priv->bo, TTM_PL_FLAG_VRAM);
+                ret = nouveau_bo_pin(priv->bo, TTM_PL_FLAG_VRAM, false);
                 if (!ret) {
                         ret = nouveau_bo_map(priv->bo);
                         if (ret)
diff --git a/drivers/gpu/drm/nouveau/nv84_fence.c b/drivers/gpu/drm/nouveau/nv84_fence.c
index 4d79be7558d8..cb5b88938d45 100644
--- a/drivers/gpu/drm/nouveau/nv84_fence.c
+++ b/drivers/gpu/drm/nouveau/nv84_fence.c
@@ -234,7 +234,7 @@ nv84_fence_create(struct nouveau_drm *drm)
         ret = nouveau_bo_new(drm->dev, 16 * priv->base.contexts, 0,
                              TTM_PL_FLAG_VRAM, 0, 0, NULL, NULL, &priv->bo);
         if (ret == 0) {
-                ret = nouveau_bo_pin(priv->bo, TTM_PL_FLAG_VRAM);
+                ret = nouveau_bo_pin(priv->bo, TTM_PL_FLAG_VRAM, false);
                 if (ret == 0) {
                         ret = nouveau_bo_map(priv->bo);
                         if (ret)
@@ -249,7 +249,7 @@ nv84_fence_create(struct nouveau_drm *drm)
                                      TTM_PL_FLAG_TT | TTM_PL_FLAG_UNCACHED, 0,
                                      0, NULL, NULL, &priv->bo_gart);
         if (ret == 0) {
-                ret = nouveau_bo_pin(priv->bo_gart, TTM_PL_FLAG_TT);
+                ret = nouveau_bo_pin(priv->bo_gart, TTM_PL_FLAG_TT, false);
                 if (ret == 0) {
                         ret = nouveau_bo_map(priv->bo_gart);
                         if (ret)