ilo: remove intel_bo_get_size()

Commit bfa8d21759 uses it to work around a
hardware limitation.  But there are other ways to do it without the need for
intel_bo_get_size().

src/gallium/drivers/ilo/ilo_gpe_gen6.h

@@ -731,20 +731,7 @@ gen6_emit_3DSTATE_VERTEX_BUFFERS(const struct ilo_dev_info *dev,
       if (cso->buffer && cso->stride <= 2048) {
          const struct ilo_buffer *buf = ilo_buffer(cso->buffer);
          const uint32_t start_offset = cso->buffer_offset;
-         /*
-          * As noted in ilo_translate_format(), we treat some 3-component
-          * formats as 4-component formats to work around hardware
-          * limitations.  Imagine the case where the vertex buffer holds a
-          * single PIPE_FORMAT_R16G16B16_FLOAT vertex, and buf->bo_size is 6.
-          * The hardware would not be able to fetch it because the vertex
-          * buffer is expected to hold a PIPE_FORMAT_R16G16B16A16_FLOAT vertex
-          * and that takes at least 8 bytes.
-          *
-          * For the workaround to work, we query the physical size, which is
-          * page aligned, to calculate end_offset so that the last vertex has
-          * a better chance to be fetched.
-          */
-         const uint32_t end_offset = intel_bo_get_size(buf->bo) - 1;
+         const uint32_t end_offset = buf->bo_size - 1;
 
          dw |= cso->stride << BRW_VB0_PITCH_SHIFT;
 

src/gallium/drivers/ilo/ilo_resource.c

@@ -1385,6 +1385,23 @@ buf_create(struct pipe_screen *screen, const struct pipe_resource *templ)
    if (templ->bind & PIPE_BIND_SAMPLER_VIEW)
       buf->bo_size = align(buf->bo_size, 256) + 16;
 
+   if (templ->bind & PIPE_BIND_VERTEX_BUFFER) {
+      /*
+       * As noted in ilo_translate_format(), we treat some 3-component formats
+       * as 4-component formats to work around hardware limitations.  Imagine
+       * the case where the vertex buffer holds a single
+       * PIPE_FORMAT_R16G16B16_FLOAT vertex, and buf->bo_size is 6.  The
+       * hardware would fail to fetch it at boundary check because the vertex
+       * buffer is expected to hold a PIPE_FORMAT_R16G16B16A16_FLOAT vertex
+       * and that takes at least 8 bytes.
+       *
+       * For the workaround to work, we should add 2 to the bo size.  But that
+       * would waste a page when the bo size is already page aligned.  Let's
+       * round it to page size for now and revisit this when needed.
+       */
+      buf->bo_size = align(buf->bo_size, 4096);
+   }
+
    if (!buf_create_bo(buf)) {
       FREE(buf);
       return NULL;

src/gallium/winsys/intel/drm/intel_drm_winsys.c

@@ -405,12 +405,6 @@ intel_bo_unreference(struct intel_bo *bo)
    drm_intel_bo_unreference(gem_bo(bo));
 }
 
-unsigned long
-intel_bo_get_size(const struct intel_bo *bo)
-{
-   return gem_bo(bo)->size;
-}
-
 void *
 intel_bo_map(struct intel_bo *bo, bool write_enable)
 {

src/gallium/winsys/intel/intel_winsys.h

@@ -197,13 +197,6 @@ intel_bo_reference(struct intel_bo *bo);
 void
 intel_bo_unreference(struct intel_bo *bo);
 
-/**
- * Return the real size of \p bo.  It may be larger than the size specified
- * in allocation due to alignment and padding requirements.
- */
-unsigned long
-intel_bo_get_size(const struct intel_bo *bo);
-
 /**
  * Map \p bo for CPU access.  Recursive mapping is allowed.
  *