drm/i915/gvt: Let the caller choose if a shadow page should be put into hash table

As we want to re-use intel_vgpu_shadow_page in buidling scrach page table
and we don't want to put scrach page table page into hash table, a new
param is introduced to give the caller a choice to decide if a shadow page
should be put into hash table.

Signed-off-by: Zhi Wang <zhi.a.wang@intel.com>

diff --git a/drivers/gpu/drm/i915/gvt/gtt.c b/drivers/gpu/drm/i915/gvt/gtt.c
index c9cbd71..912d63b 100644 (file)
--- a/drivers/gpu/drm/i915/gvt/gtt.c
+++ b/drivers/gpu/drm/i915/gvt/gtt.c
@@ -633,7 +633,7 @@ static void clean_guest_page(struct intel_vgpu *vgpu,
 }
 
 static inline int init_shadow_page(struct intel_vgpu *vgpu,
-               struct intel_vgpu_shadow_page *p, int type)
+               struct intel_vgpu_shadow_page *p, int type, bool hash)
 {
        struct device *kdev = &vgpu->gvt->dev_priv->drm.pdev->dev;
        dma_addr_t daddr;
@@ -650,7 +650,8 @@ static inline int init_shadow_page(struct intel_vgpu *vgpu,
        INIT_HLIST_NODE(&p->node);
 
        p->mfn = daddr >> I915_GTT_PAGE_SHIFT;
-       hash_add(vgpu->gtt.shadow_page_hash_table, &p->node, p->mfn);
+       if (hash)
+               hash_add(vgpu->gtt.shadow_page_hash_table, &p->node, p->mfn);
        return 0;
 }
 
@@ -782,7 +783,7 @@ retry:
         * TODO: guest page type may be different with shadow page type,
         *       when we support PSE page in future.
         */
-       ret = init_shadow_page(vgpu, &spt->shadow_page, type);
+       ret = init_shadow_page(vgpu, &spt->shadow_page, type, true);
        if (ret) {
                gvt_vgpu_err("fail to initialize shadow page for spt\n");
                goto err;
@@ -1902,11 +1903,11 @@ static int emulate_gtt_mmio_write(struct intel_vgpu *vgpu, unsigned int off,
                         * update the entry in this situation p2m will fail
                         * settting the shadow entry to point to a scratch page
                         */
-                       ops->set_pfn(&m, gvt->gtt.scratch_ggtt_mfn);
+                       ops->set_pfn(&m, gvt->gtt.scratch_mfn);
                }
        } else {
                m = e;
-               ops->set_pfn(&m, gvt->gtt.scratch_ggtt_mfn);
+               ops->set_pfn(&m, gvt->gtt.scratch_mfn);
        }
 
        ggtt_set_shadow_entry(ggtt_mm, &m, g_gtt_index);
@@ -2309,16 +2310,16 @@ int intel_gvt_init_gtt(struct intel_gvt *gvt)
                __free_page(virt_to_page(page));
                return -ENOMEM;
        }
-       gvt->gtt.scratch_ggtt_page = virt_to_page(page);
-       gvt->gtt.scratch_ggtt_mfn = (unsigned long)(daddr >>
-                       I915_GTT_PAGE_SHIFT);
+
+       gvt->gtt.scratch_page = virt_to_page(page);
+       gvt->gtt.scratch_mfn = (unsigned long)(daddr >> I915_GTT_PAGE_SHIFT);
 
        if (enable_out_of_sync) {
                ret = setup_spt_oos(gvt);
                if (ret) {
                        gvt_err("fail to initialize SPT oos\n");
                        dma_unmap_page(dev, daddr, 4096, PCI_DMA_BIDIRECTIONAL);
-                       __free_page(gvt->gtt.scratch_ggtt_page);
+                       __free_page(gvt->gtt.scratch_page);
                        return ret;
                }
        }
@@ -2337,12 +2338,12 @@ int intel_gvt_init_gtt(struct intel_gvt *gvt)
 void intel_gvt_clean_gtt(struct intel_gvt *gvt)
 {
        struct device *dev = &gvt->dev_priv->drm.pdev->dev;
-       dma_addr_t daddr = (dma_addr_t)(gvt->gtt.scratch_ggtt_mfn <<
+       dma_addr_t daddr = (dma_addr_t)(gvt->gtt.scratch_mfn <<
                                        I915_GTT_PAGE_SHIFT);
 
        dma_unmap_page(dev, daddr, 4096, PCI_DMA_BIDIRECTIONAL);
 
-       __free_page(gvt->gtt.scratch_ggtt_page);
+       __free_page(gvt->gtt.scratch_page);
 
        if (enable_out_of_sync)
                clean_spt_oos(gvt);
@@ -2368,7 +2369,7 @@ void intel_vgpu_reset_ggtt(struct intel_vgpu *vgpu)
 
        memset(&e, 0, sizeof(struct intel_gvt_gtt_entry));
        e.type = GTT_TYPE_GGTT_PTE;
-       ops->set_pfn(&e, gvt->gtt.scratch_ggtt_mfn);
+       ops->set_pfn(&e, gvt->gtt.scratch_mfn);
        e.val64 |= _PAGE_PRESENT;
 
        index = vgpu_aperture_gmadr_base(vgpu) >> PAGE_SHIFT;

diff --git a/drivers/gpu/drm/i915/gvt/gtt.h b/drivers/gpu/drm/i915/gvt/gtt.h
index 80b2deb..ab59027 100644 (file)
--- a/drivers/gpu/drm/i915/gvt/gtt.h
+++ b/drivers/gpu/drm/i915/gvt/gtt.h
@@ -85,8 +85,8 @@ struct intel_gvt_gtt {
        struct list_head oos_page_free_list_head;
        struct list_head mm_lru_list_head;
 
-       struct page *scratch_ggtt_page;
-       unsigned long scratch_ggtt_mfn;
+       struct page *scratch_page;
+       unsigned long scratch_mfn;
 };
 
 enum {