drm/i915/gvt: Constify intel_gvt_gtt_pte_ops

These are never modified, so make them const to allow the compiler to
put them in read-only memory.
Signed-off-by: Rikard Falkeborn <rikard.falkeborn@gmail.com>
Signed-off-by: Zhi Wang <zhi.a.wang@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20211204105527.15741-3-rikard.falkeborn@gmail.comReviewed-by: Zhi Wang <zhi.a.wang@intel.com>

drivers/gpu/drm/i915/gvt/gtt.c

@@ -499,7 +499,7 @@ DEFINE_PPGTT_GMA_TO_INDEX(gen8, l3_pdp, (gma >> 30 & 0x3));
 DEFINE_PPGTT_GMA_TO_INDEX(gen8, l4_pdp, (gma >> 30 & 0x1ff));
 DEFINE_PPGTT_GMA_TO_INDEX(gen8, pml4, (gma >> 39 & 0x1ff));
 
-static struct intel_gvt_gtt_pte_ops gen8_gtt_pte_ops = {
+static const struct intel_gvt_gtt_pte_ops gen8_gtt_pte_ops = {
 	.get_entry = gtt_get_entry64,
 	.set_entry = gtt_set_entry64,
 	.clear_present = gtt_entry_clear_present,
@@ -526,7 +526,7 @@ static const struct intel_gvt_gtt_gma_ops gen8_gtt_gma_ops = {
 };
 
 /* Update entry type per pse and ips bit. */
-static void update_entry_type_for_real(struct intel_gvt_gtt_pte_ops *pte_ops,
+static void update_entry_type_for_real(const struct intel_gvt_gtt_pte_ops *pte_ops,
 	struct intel_gvt_gtt_entry *entry, bool ips)
 {
 	switch (entry->type) {
@@ -553,7 +553,7 @@ static void _ppgtt_get_root_entry(struct intel_vgpu_mm *mm,
 		struct intel_gvt_gtt_entry *entry, unsigned long index,
 		bool guest)
 {
-	struct intel_gvt_gtt_pte_ops *pte_ops = mm->vgpu->gvt->gtt.pte_ops;
+	const struct intel_gvt_gtt_pte_ops *pte_ops = mm->vgpu->gvt->gtt.pte_ops;
 
 	GEM_BUG_ON(mm->type != INTEL_GVT_MM_PPGTT);
 
@@ -580,7 +580,7 @@ static void _ppgtt_set_root_entry(struct intel_vgpu_mm *mm,
 		struct intel_gvt_gtt_entry *entry, unsigned long index,
 		bool guest)
 {
-	struct intel_gvt_gtt_pte_ops *pte_ops = mm->vgpu->gvt->gtt.pte_ops;
+	const struct intel_gvt_gtt_pte_ops *pte_ops = mm->vgpu->gvt->gtt.pte_ops;
 
 	pte_ops->set_entry(guest ? mm->ppgtt_mm.guest_pdps :
 			   mm->ppgtt_mm.shadow_pdps,
@@ -596,7 +596,7 @@ static inline void ppgtt_set_shadow_root_entry(struct intel_vgpu_mm *mm,
 static void ggtt_get_guest_entry(struct intel_vgpu_mm *mm,
 		struct intel_gvt_gtt_entry *entry, unsigned long index)
 {
-	struct intel_gvt_gtt_pte_ops *pte_ops = mm->vgpu->gvt->gtt.pte_ops;
+	const struct intel_gvt_gtt_pte_ops *pte_ops = mm->vgpu->gvt->gtt.pte_ops;
 
 	GEM_BUG_ON(mm->type != INTEL_GVT_MM_GGTT);
 
@@ -608,7 +608,7 @@ static void ggtt_get_guest_entry(struct intel_vgpu_mm *mm,
 static void ggtt_set_guest_entry(struct intel_vgpu_mm *mm,
 		struct intel_gvt_gtt_entry *entry, unsigned long index)
 {
-	struct intel_gvt_gtt_pte_ops *pte_ops = mm->vgpu->gvt->gtt.pte_ops;
+	const struct intel_gvt_gtt_pte_ops *pte_ops = mm->vgpu->gvt->gtt.pte_ops;
 
 	GEM_BUG_ON(mm->type != INTEL_GVT_MM_GGTT);
 
@@ -619,7 +619,7 @@ static void ggtt_set_guest_entry(struct intel_vgpu_mm *mm,
 static void ggtt_get_host_entry(struct intel_vgpu_mm *mm,
 		struct intel_gvt_gtt_entry *entry, unsigned long index)
 {
-	struct intel_gvt_gtt_pte_ops *pte_ops = mm->vgpu->gvt->gtt.pte_ops;
+	const struct intel_gvt_gtt_pte_ops *pte_ops = mm->vgpu->gvt->gtt.pte_ops;
 
 	GEM_BUG_ON(mm->type != INTEL_GVT_MM_GGTT);
 
@@ -629,7 +629,7 @@ static void ggtt_get_host_entry(struct intel_vgpu_mm *mm,
 static void ggtt_set_host_entry(struct intel_vgpu_mm *mm,
 		struct intel_gvt_gtt_entry *entry, unsigned long index)
 {
-	struct intel_gvt_gtt_pte_ops *pte_ops = mm->vgpu->gvt->gtt.pte_ops;
+	const struct intel_gvt_gtt_pte_ops *pte_ops = mm->vgpu->gvt->gtt.pte_ops;
 	unsigned long offset = index;
 
 	GEM_BUG_ON(mm->type != INTEL_GVT_MM_GGTT);
@@ -655,7 +655,7 @@ static inline int ppgtt_spt_get_entry(
 		bool guest)
 {
 	struct intel_gvt *gvt = spt->vgpu->gvt;
-	struct intel_gvt_gtt_pte_ops *ops = gvt->gtt.pte_ops;
+	const struct intel_gvt_gtt_pte_ops *ops = gvt->gtt.pte_ops;
 	int ret;
 
 	e->type = get_entry_type(type);
@@ -684,7 +684,7 @@ static inline int ppgtt_spt_set_entry(
 		bool guest)
 {
 	struct intel_gvt *gvt = spt->vgpu->gvt;
-	struct intel_gvt_gtt_pte_ops *ops = gvt->gtt.pte_ops;
+	const struct intel_gvt_gtt_pte_ops *ops = gvt->gtt.pte_ops;
 
 	if (WARN(!gtt_type_is_entry(e->type), "invalid entry type\n"))
 		return -EINVAL;
@@ -947,7 +947,7 @@ static int ppgtt_invalidate_spt_by_shadow_entry(struct intel_vgpu *vgpu,
 		struct intel_gvt_gtt_entry *e)
 {
 	struct drm_i915_private *i915 = vgpu->gvt->gt->i915;
-	struct intel_gvt_gtt_pte_ops *ops = vgpu->gvt->gtt.pte_ops;
+	const struct intel_gvt_gtt_pte_ops *ops = vgpu->gvt->gtt.pte_ops;
 	struct intel_vgpu_ppgtt_spt *s;
 	enum intel_gvt_gtt_type cur_pt_type;
 
@@ -984,7 +984,7 @@ static inline void ppgtt_invalidate_pte(struct intel_vgpu_ppgtt_spt *spt,
 		struct intel_gvt_gtt_entry *entry)
 {
 	struct intel_vgpu *vgpu = spt->vgpu;
-	struct intel_gvt_gtt_pte_ops *ops = vgpu->gvt->gtt.pte_ops;
+	const struct intel_gvt_gtt_pte_ops *ops = vgpu->gvt->gtt.pte_ops;
 	unsigned long pfn;
 	int type;
 
@@ -1072,7 +1072,7 @@ static int ppgtt_populate_spt(struct intel_vgpu_ppgtt_spt *spt);
 static struct intel_vgpu_ppgtt_spt *ppgtt_populate_spt_by_guest_entry(
 		struct intel_vgpu *vgpu, struct intel_gvt_gtt_entry *we)
 {
-	struct intel_gvt_gtt_pte_ops *ops = vgpu->gvt->gtt.pte_ops;
+	const struct intel_gvt_gtt_pte_ops *ops = vgpu->gvt->gtt.pte_ops;
 	struct intel_vgpu_ppgtt_spt *spt = NULL;
 	bool ips = false;
 	int ret;
@@ -1136,7 +1136,7 @@ static struct intel_vgpu_ppgtt_spt *ppgtt_populate_spt_by_guest_entry(
 static inline void ppgtt_generate_shadow_entry(struct intel_gvt_gtt_entry *se,
 		struct intel_vgpu_ppgtt_spt *s, struct intel_gvt_gtt_entry *ge)
 {
-	struct intel_gvt_gtt_pte_ops *ops = s->vgpu->gvt->gtt.pte_ops;
+	const struct intel_gvt_gtt_pte_ops *ops = s->vgpu->gvt->gtt.pte_ops;
 
 	se->type = ge->type;
 	se->val64 = ge->val64;
@@ -1159,7 +1159,7 @@ static inline void ppgtt_generate_shadow_entry(struct intel_gvt_gtt_entry *se,
 static int is_2MB_gtt_possible(struct intel_vgpu *vgpu,
 	struct intel_gvt_gtt_entry *entry)
 {
-	struct intel_gvt_gtt_pte_ops *ops = vgpu->gvt->gtt.pte_ops;
+	const struct intel_gvt_gtt_pte_ops *ops = vgpu->gvt->gtt.pte_ops;
 	unsigned long pfn;
 
 	if (!HAS_PAGE_SIZES(vgpu->gvt->gt->i915, I915_GTT_PAGE_SIZE_2M))
@@ -1176,7 +1176,7 @@ static int split_2MB_gtt_entry(struct intel_vgpu *vgpu,
 	struct intel_vgpu_ppgtt_spt *spt, unsigned long index,
 	struct intel_gvt_gtt_entry *se)
 {
-	struct intel_gvt_gtt_pte_ops *ops = vgpu->gvt->gtt.pte_ops;
+	const struct intel_gvt_gtt_pte_ops *ops = vgpu->gvt->gtt.pte_ops;
 	struct intel_vgpu_ppgtt_spt *sub_spt;
 	struct intel_gvt_gtt_entry sub_se;
 	unsigned long start_gfn;
@@ -1223,7 +1223,7 @@ static int split_64KB_gtt_entry(struct intel_vgpu *vgpu,
 	struct intel_vgpu_ppgtt_spt *spt, unsigned long index,
 	struct intel_gvt_gtt_entry *se)
 {
-	struct intel_gvt_gtt_pte_ops *ops = vgpu->gvt->gtt.pte_ops;
+	const struct intel_gvt_gtt_pte_ops *ops = vgpu->gvt->gtt.pte_ops;
 	struct intel_gvt_gtt_entry entry = *se;
 	unsigned long start_gfn;
 	dma_addr_t dma_addr;
@@ -1254,7 +1254,7 @@ static int ppgtt_populate_shadow_entry(struct intel_vgpu *vgpu,
 	struct intel_vgpu_ppgtt_spt *spt, unsigned long index,
 	struct intel_gvt_gtt_entry *ge)
 {
-	struct intel_gvt_gtt_pte_ops *pte_ops = vgpu->gvt->gtt.pte_ops;
+	const struct intel_gvt_gtt_pte_ops *pte_ops = vgpu->gvt->gtt.pte_ops;
 	struct intel_gvt_gtt_entry se = *ge;
 	unsigned long gfn, page_size = PAGE_SIZE;
 	dma_addr_t dma_addr;
@@ -1308,7 +1308,7 @@ static int ppgtt_populate_spt(struct intel_vgpu_ppgtt_spt *spt)
 {
 	struct intel_vgpu *vgpu = spt->vgpu;
 	struct intel_gvt *gvt = vgpu->gvt;
-	struct intel_gvt_gtt_pte_ops *ops = gvt->gtt.pte_ops;
+	const struct intel_gvt_gtt_pte_ops *ops = gvt->gtt.pte_ops;
 	struct intel_vgpu_ppgtt_spt *s;
 	struct intel_gvt_gtt_entry se, ge;
 	unsigned long gfn, i;
@@ -1351,7 +1351,7 @@ static int ppgtt_handle_guest_entry_removal(struct intel_vgpu_ppgtt_spt *spt,
 		struct intel_gvt_gtt_entry *se, unsigned long index)
 {
 	struct intel_vgpu *vgpu = spt->vgpu;
-	struct intel_gvt_gtt_pte_ops *ops = vgpu->gvt->gtt.pte_ops;
+	const struct intel_gvt_gtt_pte_ops *ops = vgpu->gvt->gtt.pte_ops;
 	int ret;
 
 	trace_spt_guest_change(spt->vgpu->id, "remove", spt,
@@ -1432,7 +1432,7 @@ static int sync_oos_page(struct intel_vgpu *vgpu,
 {
 	const struct intel_gvt_device_info *info = &vgpu->gvt->device_info;
 	struct intel_gvt *gvt = vgpu->gvt;
-	struct intel_gvt_gtt_pte_ops *ops = gvt->gtt.pte_ops;
+	const struct intel_gvt_gtt_pte_ops *ops = gvt->gtt.pte_ops;
 	struct intel_vgpu_ppgtt_spt *spt = oos_page->spt;
 	struct intel_gvt_gtt_entry old, new;
 	int index;
@@ -1603,7 +1603,7 @@ static int ppgtt_handle_guest_write_page_table(
 {
 	struct intel_vgpu *vgpu = spt->vgpu;
 	int type = spt->shadow_page.type;
-	struct intel_gvt_gtt_pte_ops *ops = vgpu->gvt->gtt.pte_ops;
+	const struct intel_gvt_gtt_pte_ops *ops = vgpu->gvt->gtt.pte_ops;
 	struct intel_gvt_gtt_entry old_se;
 	int new_present;
 	int i, ret;
@@ -1720,7 +1720,7 @@ static int ppgtt_handle_guest_write_page_table_bytes(
 		u64 pa, void *p_data, int bytes)
 {
 	struct intel_vgpu *vgpu = spt->vgpu;
-	struct intel_gvt_gtt_pte_ops *ops = vgpu->gvt->gtt.pte_ops;
+	const struct intel_gvt_gtt_pte_ops *ops = vgpu->gvt->gtt.pte_ops;
 	const struct intel_gvt_device_info *info = &vgpu->gvt->device_info;
 	struct intel_gvt_gtt_entry we, se;
 	unsigned long index;
@@ -1785,7 +1785,7 @@ static void invalidate_ppgtt_mm(struct intel_vgpu_mm *mm)
 	struct intel_vgpu *vgpu = mm->vgpu;
 	struct intel_gvt *gvt = vgpu->gvt;
 	struct intel_gvt_gtt *gtt = &gvt->gtt;
-	struct intel_gvt_gtt_pte_ops *ops = gtt->pte_ops;
+	const struct intel_gvt_gtt_pte_ops *ops = gtt->pte_ops;
 	struct intel_gvt_gtt_entry se;
 	int index;
 
@@ -1815,7 +1815,7 @@ static int shadow_ppgtt_mm(struct intel_vgpu_mm *mm)
 	struct intel_vgpu *vgpu = mm->vgpu;
 	struct intel_gvt *gvt = vgpu->gvt;
 	struct intel_gvt_gtt *gtt = &gvt->gtt;
-	struct intel_gvt_gtt_pte_ops *ops = gtt->pte_ops;
+	const struct intel_gvt_gtt_pte_ops *ops = gtt->pte_ops;
 	struct intel_vgpu_ppgtt_spt *spt;
 	struct intel_gvt_gtt_entry ge, se;
 	int index, ret;
@@ -2067,7 +2067,7 @@ static inline int ppgtt_get_next_level_entry(struct intel_vgpu_mm *mm,
 		struct intel_gvt_gtt_entry *e, unsigned long index, bool guest)
 {
 	struct intel_vgpu *vgpu = mm->vgpu;
-	struct intel_gvt_gtt_pte_ops *ops = vgpu->gvt->gtt.pte_ops;
+	const struct intel_gvt_gtt_pte_ops *ops = vgpu->gvt->gtt.pte_ops;
 	struct intel_vgpu_ppgtt_spt *s;
 
 	s = intel_vgpu_find_spt_by_mfn(vgpu, ops->get_pfn(e));
@@ -2096,7 +2096,7 @@ unsigned long intel_vgpu_gma_to_gpa(struct intel_vgpu_mm *mm, unsigned long gma)
 {
 	struct intel_vgpu *vgpu = mm->vgpu;
 	struct intel_gvt *gvt = vgpu->gvt;
-	struct intel_gvt_gtt_pte_ops *pte_ops = gvt->gtt.pte_ops;
+	const struct intel_gvt_gtt_pte_ops *pte_ops = gvt->gtt.pte_ops;
 	const struct intel_gvt_gtt_gma_ops *gma_ops = gvt->gtt.gma_ops;
 	unsigned long gpa = INTEL_GVT_INVALID_ADDR;
 	unsigned long gma_index[4];
@@ -2221,7 +2221,7 @@ int intel_vgpu_emulate_ggtt_mmio_read(struct intel_vgpu *vgpu, unsigned int off,
 static void ggtt_invalidate_pte(struct intel_vgpu *vgpu,
 		struct intel_gvt_gtt_entry *entry)
 {
-	struct intel_gvt_gtt_pte_ops *pte_ops = vgpu->gvt->gtt.pte_ops;
+	const struct intel_gvt_gtt_pte_ops *pte_ops = vgpu->gvt->gtt.pte_ops;
 	unsigned long pfn;
 
 	pfn = pte_ops->get_pfn(entry);
@@ -2236,7 +2236,7 @@ static int emulate_ggtt_mmio_write(struct intel_vgpu *vgpu, unsigned int off,
 	struct intel_gvt *gvt = vgpu->gvt;
 	const struct intel_gvt_device_info *info = &gvt->device_info;
 	struct intel_vgpu_mm *ggtt_mm = vgpu->gtt.ggtt_mm;
-	struct intel_gvt_gtt_pte_ops *ops = gvt->gtt.pte_ops;
+	const struct intel_gvt_gtt_pte_ops *ops = gvt->gtt.pte_ops;
 	unsigned long g_gtt_index = off >> info->gtt_entry_size_shift;
 	unsigned long gma, gfn;
 	struct intel_gvt_gtt_entry e = {.val64 = 0, .type = GTT_TYPE_GGTT_PTE};
@@ -2391,7 +2391,7 @@ static int alloc_scratch_pages(struct intel_vgpu *vgpu,
 {
 	struct drm_i915_private *i915 = vgpu->gvt->gt->i915;
 	struct intel_vgpu_gtt *gtt = &vgpu->gtt;
-	struct intel_gvt_gtt_pte_ops *ops = vgpu->gvt->gtt.pte_ops;
+	const struct intel_gvt_gtt_pte_ops *ops = vgpu->gvt->gtt.pte_ops;
 	int page_entry_num = I915_GTT_PAGE_SIZE >>
 				vgpu->gvt->device_info.gtt_entry_size_shift;
 	void *scratch_pt;
@@ -2822,7 +2822,7 @@ void intel_vgpu_invalidate_ppgtt(struct intel_vgpu *vgpu)
 void intel_vgpu_reset_ggtt(struct intel_vgpu *vgpu, bool invalidate_old)
 {
 	struct intel_gvt *gvt = vgpu->gvt;
-	struct intel_gvt_gtt_pte_ops *pte_ops = vgpu->gvt->gtt.pte_ops;
+	const struct intel_gvt_gtt_pte_ops *pte_ops = vgpu->gvt->gtt.pte_ops;
 	struct intel_gvt_gtt_entry entry = {.type = GTT_TYPE_GGTT_PTE};
 	struct intel_gvt_gtt_entry old_entry;
 	u32 index;

drivers/gpu/drm/i915/gvt/gtt.h

@@ -91,7 +91,7 @@ struct intel_gvt_gtt_gma_ops {
 };
 
 struct intel_gvt_gtt {
-	struct intel_gvt_gtt_pte_ops *pte_ops;
+	const struct intel_gvt_gtt_pte_ops *pte_ops;
 	const struct intel_gvt_gtt_gma_ops *gma_ops;
 	int (*mm_alloc_page_table)(struct intel_vgpu_mm *mm);
 	void (*mm_free_page_table)(struct intel_vgpu_mm *mm);