drm/i915/gvt: devirtualize ->{read,write}_gpa

Just call the VFIO functions directly instead of through the method
table.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Zhi Wang <zhi.a.wang@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20220411141403.86980-14-hch@lst.de
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Reviewed-by: Zhi Wang <zhi.a.wang@intel.com>

10 files changed, 72 insertions, 97 deletions

diff --git a/drivers/gpu/drm/i915/gvt/cmd_parser.c b/drivers/gpu/drm/i915/gvt/cmd_parser.c
index 2459213b6c87..b9eb75a2b400 100644
--- a/drivers/gpu/drm/i915/gvt/cmd_parser.c
+++ b/drivers/gpu/drm/i915/gvt/cmd_parser.c
@@ -1011,7 +1011,7 @@ static int cmd_reg_handler(struct parser_exec_state *s,
 	if (GRAPHICS_VER(s->engine->i915) == 9 &&
 	    intel_gvt_mmio_is_sr_in_ctx(gvt, offset) &&
 	    !strncmp(cmd, "lri", 3)) {
-		intel_gvt_hypervisor_read_gpa(s->vgpu,
+		intel_gvt_read_gpa(s->vgpu,
 			s->workload->ring_context_gpa + 12, &ctx_sr_ctl, 4);
 		/* check inhibit context */
 		if (ctx_sr_ctl & 1) {
@@ -1775,7 +1775,7 @@ static int copy_gma_to_hva(struct intel_vgpu *vgpu, struct intel_vgpu_mm *mm,
 		copy_len = (end_gma - gma) >= (I915_GTT_PAGE_SIZE - offset) ?
 			I915_GTT_PAGE_SIZE - offset : end_gma - gma;
 
-		intel_gvt_hypervisor_read_gpa(vgpu, gpa, va + len, copy_len);
+		intel_gvt_read_gpa(vgpu, gpa, va + len, copy_len);
 
 		len += copy_len;
 		gma += copy_len;
diff --git a/drivers/gpu/drm/i915/gvt/execlist.c b/drivers/gpu/drm/i915/gvt/execlist.c
index 66d354c4195b..274c6ef42400 100644
--- a/drivers/gpu/drm/i915/gvt/execlist.c
+++ b/drivers/gpu/drm/i915/gvt/execlist.c
@@ -159,12 +159,12 @@ static void emulate_csb_update(struct intel_vgpu_execlist *execlist,
 	hwsp_gpa = intel_vgpu_gma_to_gpa(vgpu->gtt.ggtt_mm,
 					 vgpu->hws_pga[execlist->engine->id]);
 	if (hwsp_gpa != INTEL_GVT_INVALID_ADDR) {
-		intel_gvt_hypervisor_write_gpa(vgpu,
-					       hwsp_gpa + I915_HWS_CSB_BUF0_INDEX * 4 + write_pointer * 8,
-					       status, 8);
-		intel_gvt_hypervisor_write_gpa(vgpu,
-					       hwsp_gpa + INTEL_HWS_CSB_WRITE_INDEX(execlist->engine->i915) * 4,
-					       &write_pointer, 4);
+		intel_gvt_write_gpa(vgpu,
+			hwsp_gpa + I915_HWS_CSB_BUF0_INDEX * 4 + write_pointer * 8,
+			status, 8);
+		intel_gvt_write_gpa(vgpu,
+			hwsp_gpa + INTEL_HWS_CSB_WRITE_INDEX(execlist->engine->i915) * 4,
+			&write_pointer, 4);
 	}
 
 	gvt_dbg_el("vgpu%d: w pointer %u reg %x csb l %x csb h %x\n",
diff --git a/drivers/gpu/drm/i915/gvt/gtt.c b/drivers/gpu/drm/i915/gvt/gtt.c
index d4082f4b9be1..9b696e5705eb 100644
--- a/drivers/gpu/drm/i915/gvt/gtt.c
+++ b/drivers/gpu/drm/i915/gvt/gtt.c
@@ -314,7 +314,7 @@ static inline int gtt_get_entry64(void *pt,
 		return -EINVAL;
 
 	if (hypervisor_access) {
-		ret = intel_gvt_hypervisor_read_gpa(vgpu, gpa +
+		ret = intel_gvt_read_gpa(vgpu, gpa +
 				(index << info->gtt_entry_size_shift),
 				&e->val64, 8);
 		if (WARN_ON(ret))
@@ -339,7 +339,7 @@ static inline int gtt_set_entry64(void *pt,
 		return -EINVAL;
 
 	if (hypervisor_access) {
-		ret = intel_gvt_hypervisor_write_gpa(vgpu, gpa +
+		ret = intel_gvt_write_gpa(vgpu, gpa +
 				(index << info->gtt_entry_size_shift),
 				&e->val64, 8);
 		if (WARN_ON(ret))
@@ -1497,7 +1497,7 @@ static int attach_oos_page(struct intel_vgpu_oos_page *oos_page,
 	struct intel_gvt *gvt = spt->vgpu->gvt;
 	int ret;
 
-	ret = intel_gvt_hypervisor_read_gpa(spt->vgpu,
+	ret = intel_gvt_read_gpa(spt->vgpu,
 			spt->guest_page.gfn << I915_GTT_PAGE_SHIFT,
 			oos_page->mem, I915_GTT_PAGE_SIZE);
 	if (ret)
diff --git a/drivers/gpu/drm/i915/gvt/gvt.h b/drivers/gpu/drm/i915/gvt/gvt.h
index cda70ea3d174..ea07f4513805 100644
--- a/drivers/gpu/drm/i915/gvt/gvt.h
+++ b/drivers/gpu/drm/i915/gvt/gvt.h
@@ -35,6 +35,7 @@
 
 #include <uapi/linux/pci_regs.h>
 #include <linux/kvm_host.h>
+#include <linux/vfio.h>
 
 #include "i915_drv.h"
 #include "intel_gvt.h"
@@ -720,6 +721,42 @@ static inline bool intel_gvt_mmio_is_cmd_write_patch(
 	return gvt->mmio.mmio_attribute[offset >> 2] & F_CMD_WRITE_PATCH;
 }
 
+/**
+ * intel_gvt_read_gpa - copy data from GPA to host data buffer
+ * @vgpu: a vGPU
+ * @gpa: guest physical address
+ * @buf: host data buffer
+ * @len: data length
+ *
+ * Returns:
+ * Zero on success, negative error code if failed.
+ */
+static inline int intel_gvt_read_gpa(struct intel_vgpu *vgpu, unsigned long gpa,
+		void *buf, unsigned long len)
+{
+	if (!vgpu->attached)
+		return -ESRCH;
+	return vfio_dma_rw(vgpu->vfio_group, gpa, buf, len, false);
+}
+
+/**
+ * intel_gvt_write_gpa - copy data from host data buffer to GPA
+ * @vgpu: a vGPU
+ * @gpa: guest physical address
+ * @buf: host data buffer
+ * @len: data length
+ *
+ * Returns:
+ * Zero on success, negative error code if failed.
+ */
+static inline int intel_gvt_write_gpa(struct intel_vgpu *vgpu,
+		unsigned long gpa, void *buf, unsigned long len)
+{
+	if (!vgpu->attached)
+		return -ESRCH;
+	return vfio_dma_rw(vgpu->vfio_group, gpa, buf, len, true);
+}
+
 void intel_gvt_debugfs_remove_vgpu(struct intel_vgpu *vgpu);
 void intel_gvt_debugfs_init(struct intel_gvt *gvt);
 void intel_gvt_debugfs_clean(struct intel_gvt *gvt);
diff --git a/drivers/gpu/drm/i915/gvt/hypercall.h b/drivers/gpu/drm/i915/gvt/hypercall.h
index 9f0475759825..61e493e2de85 100644
--- a/drivers/gpu/drm/i915/gvt/hypercall.h
+++ b/drivers/gpu/drm/i915/gvt/hypercall.h
@@ -49,10 +49,6 @@ struct intel_gvt_mpt {
 	int (*inject_msi)(struct intel_vgpu *vgpu, u32 addr, u16 data);
 	int (*enable_page_track)(struct intel_vgpu *vgpu, u64 gfn);
 	int (*disable_page_track)(struct intel_vgpu *vgpu, u64 gfn);
-	int (*read_gpa)(struct intel_vgpu *vgpu, unsigned long gpa, void *buf,
-			unsigned long len);
-	int (*write_gpa)(struct intel_vgpu *vgpu, unsigned long gpa, void *buf,
-			 unsigned long len);
 	unsigned long (*gfn_to_mfn)(struct intel_vgpu *vgpu, unsigned long gfn);
 
 	int (*dma_map_guest_page)(struct intel_vgpu *vgpu, unsigned long gfn,
diff --git a/drivers/gpu/drm/i915/gvt/kvmgt.c b/drivers/gpu/drm/i915/gvt/kvmgt.c
index ed010ab13310..e4e3d0cc66fc 100644
--- a/drivers/gpu/drm/i915/gvt/kvmgt.c
+++ b/drivers/gpu/drm/i915/gvt/kvmgt.c
@@ -39,7 +39,6 @@
 #include <linux/spinlock.h>
 #include <linux/eventfd.h>
 #include <linux/uuid.h>
-#include <linux/vfio.h>
 #include <linux/mdev.h>
 #include <linux/debugfs.h>
 
@@ -2024,26 +2023,6 @@ static void kvmgt_dma_unmap_guest_page(struct intel_vgpu *vgpu,
 	mutex_unlock(&vgpu->cache_lock);
 }
 
-static int kvmgt_rw_gpa(struct intel_vgpu *vgpu, unsigned long gpa,
-			void *buf, unsigned long len, bool write)
-{
-	if (!vgpu->attached)
-		return -ESRCH;
-	return vfio_dma_rw(vgpu->vfio_group, gpa, buf, len, write);
-}
-
-static int kvmgt_read_gpa(struct intel_vgpu *vgpu, unsigned long gpa,
-			void *buf, unsigned long len)
-{
-	return kvmgt_rw_gpa(vgpu, gpa, buf, len, false);
-}
-
-static int kvmgt_write_gpa(struct intel_vgpu *vgpu, unsigned long gpa,
-			void *buf, unsigned long len)
-{
-	return kvmgt_rw_gpa(vgpu, gpa, buf, len, true);
-}
-
 static bool kvmgt_is_valid_gfn(struct intel_vgpu *vgpu, unsigned long gfn)
 {
 	struct kvm *kvm = vgpu->kvm;
@@ -2067,8 +2046,6 @@ static const struct intel_gvt_mpt kvmgt_mpt = {
 	.inject_msi = kvmgt_inject_msi,
 	.enable_page_track = kvmgt_page_track_add,
 	.disable_page_track = kvmgt_page_track_remove,
-	.read_gpa = kvmgt_read_gpa,
-	.write_gpa = kvmgt_write_gpa,
 	.gfn_to_mfn = kvmgt_gfn_to_pfn,
 	.dma_map_guest_page = kvmgt_dma_map_guest_page,
 	.dma_unmap_guest_page = kvmgt_dma_unmap_guest_page,
diff --git a/drivers/gpu/drm/i915/gvt/mmio.c b/drivers/gpu/drm/i915/gvt/mmio.c
index 5db0ef83d522..9acc00505fde 100644
--- a/drivers/gpu/drm/i915/gvt/mmio.c
+++ b/drivers/gpu/drm/i915/gvt/mmio.c
@@ -139,7 +139,7 @@ int intel_vgpu_emulate_mmio_read(struct intel_vgpu *vgpu, u64 pa,
 	}
 
 	if (drm_WARN_ON_ONCE(&i915->drm, !reg_is_mmio(gvt, offset))) {
-		ret = intel_gvt_hypervisor_read_gpa(vgpu, pa, p_data, bytes);
+		ret = intel_gvt_read_gpa(vgpu, pa, p_data, bytes);
 		goto out;
 	}
 
@@ -215,7 +215,7 @@ int intel_vgpu_emulate_mmio_write(struct intel_vgpu *vgpu, u64 pa,
 	}
 
 	if (drm_WARN_ON_ONCE(&i915->drm, !reg_is_mmio(gvt, offset))) {
-		ret = intel_gvt_hypervisor_write_gpa(vgpu, pa, p_data, bytes);
+		ret = intel_gvt_write_gpa(vgpu, pa, p_data, bytes);
 		goto out;
 	}
 
diff --git a/drivers/gpu/drm/i915/gvt/mpt.h b/drivers/gpu/drm/i915/gvt/mpt.h
index ba0c31c4a705..72388ceec596 100644
--- a/drivers/gpu/drm/i915/gvt/mpt.h
+++ b/drivers/gpu/drm/i915/gvt/mpt.h
@@ -153,38 +153,6 @@ static inline int intel_gvt_hypervisor_disable_page_track(
 }
 
 /**
- * intel_gvt_hypervisor_read_gpa - copy data from GPA to host data buffer
- * @vgpu: a vGPU
- * @gpa: guest physical address
- * @buf: host data buffer
- * @len: data length
- *
- * Returns:
- * Zero on success, negative error code if failed.
- */
-static inline int intel_gvt_hypervisor_read_gpa(struct intel_vgpu *vgpu,
-		unsigned long gpa, void *buf, unsigned long len)
-{
-	return intel_gvt_host.mpt->read_gpa(vgpu, gpa, buf, len);
-}
-
-/**
- * intel_gvt_hypervisor_write_gpa - copy data from host data buffer to GPA
- * @vgpu: a vGPU
- * @gpa: guest physical address
- * @buf: host data buffer
- * @len: data length
- *
- * Returns:
- * Zero on success, negative error code if failed.
- */
-static inline int intel_gvt_hypervisor_write_gpa(struct intel_vgpu *vgpu,
-		unsigned long gpa, void *buf, unsigned long len)
-{
-	return intel_gvt_host.mpt->write_gpa(vgpu, gpa, buf, len);
-}
-
-/**
  * intel_gvt_hypervisor_gfn_to_mfn - translate a GFN to MFN
  * @vgpu: a vGPU
  * @gpfn: guest pfn
diff --git a/drivers/gpu/drm/i915/gvt/opregion.c b/drivers/gpu/drm/i915/gvt/opregion.c
index 286ac6d7c6ce..d2bed466540a 100644
--- a/drivers/gpu/drm/i915/gvt/opregion.c
+++ b/drivers/gpu/drm/i915/gvt/opregion.c
@@ -421,14 +421,14 @@ int intel_vgpu_emulate_opregion_request(struct intel_vgpu *vgpu, u32 swsci)
 				INTEL_GVT_OPREGION_SCIC;
 	parm_pa = (vgpu_opregion(vgpu)->gfn[0] << PAGE_SHIFT) +
 				INTEL_GVT_OPREGION_PARM;
-	ret = intel_gvt_hypervisor_read_gpa(vgpu, scic_pa, &scic, sizeof(scic));
+	ret = intel_gvt_read_gpa(vgpu, scic_pa, &scic, sizeof(scic));
 	if (ret) {
 		gvt_vgpu_err("guest opregion read error %d, gpa 0x%llx, len %lu\n",
 			ret, scic_pa, sizeof(scic));
 		return ret;
 	}
 
-	ret = intel_gvt_hypervisor_read_gpa(vgpu, parm_pa, &parm, sizeof(parm));
+	ret = intel_gvt_read_gpa(vgpu, parm_pa, &parm, sizeof(parm));
 	if (ret) {
 		gvt_vgpu_err("guest opregion read error %d, gpa 0x%llx, len %lu\n",
 			ret, scic_pa, sizeof(scic));
@@ -465,16 +465,14 @@ int intel_vgpu_emulate_opregion_request(struct intel_vgpu *vgpu, u32 swsci)
 	parm = 0;
 
 out:
-	ret = intel_gvt_hypervisor_write_gpa(vgpu, scic_pa, &scic,
-					     sizeof(scic));
+	ret = intel_gvt_write_gpa(vgpu, scic_pa, &scic, sizeof(scic));
 	if (ret) {
 		gvt_vgpu_err("guest opregion write error %d, gpa 0x%llx, len %lu\n",
 			ret, scic_pa, sizeof(scic));
 		return ret;
 	}
 
-	ret = intel_gvt_hypervisor_write_gpa(vgpu, parm_pa, &parm,
-					     sizeof(parm));
+	ret = intel_gvt_write_gpa(vgpu, parm_pa, &parm, sizeof(parm));
 	if (ret) {
 		gvt_vgpu_err("guest opregion write error %d, gpa 0x%llx, len %lu\n",
 			ret, scic_pa, sizeof(scic));
diff --git a/drivers/gpu/drm/i915/gvt/scheduler.c b/drivers/gpu/drm/i915/gvt/scheduler.c
index 679476da0640..d6fe94cd0fdb 100644
--- a/drivers/gpu/drm/i915/gvt/scheduler.c
+++ b/drivers/gpu/drm/i915/gvt/scheduler.c
@@ -150,10 +150,10 @@ static int populate_shadow_context(struct intel_vgpu_workload *workload)
 
 	sr_oa_regs(workload, (u32 *)shadow_ring_context, true);
 #define COPY_REG(name) \
-	intel_gvt_hypervisor_read_gpa(vgpu, workload->ring_context_gpa \
+	intel_gvt_read_gpa(vgpu, workload->ring_context_gpa \
 		+ RING_CTX_OFF(name.val), &shadow_ring_context->name.val, 4)
 #define COPY_REG_MASKED(name) {\
-		intel_gvt_hypervisor_read_gpa(vgpu, workload->ring_context_gpa \
+		intel_gvt_read_gpa(vgpu, workload->ring_context_gpa \
 					      + RING_CTX_OFF(name.val),\
 					      &shadow_ring_context->name.val, 4);\
 		shadow_ring_context->name.val |= 0xffff << 16;\
@@ -167,7 +167,7 @@ static int populate_shadow_context(struct intel_vgpu_workload *workload)
 		COPY_REG(rcs_indirect_ctx);
 		COPY_REG(rcs_indirect_ctx_offset);
 	} else if (workload->engine->id == BCS0)
-		intel_gvt_hypervisor_read_gpa(vgpu,
+		intel_gvt_read_gpa(vgpu,
 				workload->ring_context_gpa +
 				BCS_TILE_REGISTER_VAL_OFFSET,
 				(void *)shadow_ring_context +
@@ -178,7 +178,7 @@ static int populate_shadow_context(struct intel_vgpu_workload *workload)
 	/* don't copy Ring Context (the first 0x50 dwords),
 	 * only copy the Engine Context part from guest
 	 */
-	intel_gvt_hypervisor_read_gpa(vgpu,
+	intel_gvt_read_gpa(vgpu,
 			workload->ring_context_gpa +
 			RING_CTX_SIZE,
 			(void *)shadow_ring_context +
@@ -245,7 +245,7 @@ static int populate_shadow_context(struct intel_vgpu_workload *workload)
 		continue;
 
 read:
-		intel_gvt_hypervisor_read_gpa(vgpu, gpa_base, dst, gpa_size);
+		intel_gvt_read_gpa(vgpu, gpa_base, dst, gpa_size);
 		gpa_base = context_gpa;
 		gpa_size = I915_GTT_PAGE_SIZE;
 		dst = context_base + (i << I915_GTT_PAGE_SHIFT);
@@ -911,8 +911,7 @@ static void update_guest_pdps(struct intel_vgpu *vgpu,
 	gpa = ring_context_gpa + RING_CTX_OFF(pdps[0].val);
 
 	for (i = 0; i < 8; i++)
-		intel_gvt_hypervisor_write_gpa(vgpu,
-				gpa + i * 8, &pdp[7 - i], 4);
+		intel_gvt_write_gpa(vgpu, gpa + i * 8, &pdp[7 - i], 4);
 }
 
 static __maybe_unused bool
@@ -1007,13 +1006,13 @@ static void update_guest_context(struct intel_vgpu_workload *workload)
 		continue;
 
 write:
-		intel_gvt_hypervisor_write_gpa(vgpu, gpa_base, src, gpa_size);
+		intel_gvt_write_gpa(vgpu, gpa_base, src, gpa_size);
 		gpa_base = context_gpa;
 		gpa_size = I915_GTT_PAGE_SIZE;
 		src = context_base + (i << I915_GTT_PAGE_SHIFT);
 	}
 
-	intel_gvt_hypervisor_write_gpa(vgpu, workload->ring_context_gpa +
+	intel_gvt_write_gpa(vgpu, workload->ring_context_gpa +
 		RING_CTX_OFF(ring_header.val), &workload->rb_tail, 4);
 
 	shadow_ring_context = (void *) ctx->lrc_reg_state;
@@ -1028,7 +1027,7 @@ write:
 	}
 
 #define COPY_REG(name) \
-	intel_gvt_hypervisor_write_gpa(vgpu, workload->ring_context_gpa + \
+	intel_gvt_write_gpa(vgpu, workload->ring_context_gpa + \
 		RING_CTX_OFF(name.val), &shadow_ring_context->name.val, 4)
 
 	COPY_REG(ctx_ctrl);
@@ -1036,7 +1035,7 @@ write:
 
 #undef COPY_REG
 
-	intel_gvt_hypervisor_write_gpa(vgpu,
+	intel_gvt_write_gpa(vgpu,
 			workload->ring_context_gpa +
 			sizeof(*shadow_ring_context),
 			(void *)shadow_ring_context +
@@ -1573,7 +1572,7 @@ static void read_guest_pdps(struct intel_vgpu *vgpu,
 	gpa = ring_context_gpa + RING_CTX_OFF(pdps[0].val);
 
 	for (i = 0; i < 8; i++)
-		intel_gvt_hypervisor_read_gpa(vgpu,
+		intel_gvt_read_gpa(vgpu,
 				gpa + i * 8, &pdp[7 - i], 4);
 }
 
@@ -1644,10 +1643,10 @@ intel_vgpu_create_workload(struct intel_vgpu *vgpu,
 		return ERR_PTR(-EINVAL);
 	}
 
-	intel_gvt_hypervisor_read_gpa(vgpu, ring_context_gpa +
+	intel_gvt_read_gpa(vgpu, ring_context_gpa +
 			RING_CTX_OFF(ring_header.val), &head, 4);
 
-	intel_gvt_hypervisor_read_gpa(vgpu, ring_context_gpa +
+	intel_gvt_read_gpa(vgpu, ring_context_gpa +
 			RING_CTX_OFF(ring_tail.val), &tail, 4);
 
 	guest_head = head;
@@ -1674,11 +1673,11 @@ intel_vgpu_create_workload(struct intel_vgpu *vgpu,
 	gvt_dbg_el("ring %s begin a new workload\n", engine->name);
 
 	/* record some ring buffer register values for scan and shadow */
-	intel_gvt_hypervisor_read_gpa(vgpu, ring_context_gpa +
+	intel_gvt_read_gpa(vgpu, ring_context_gpa +
 			RING_CTX_OFF(rb_start.val), &start, 4);
-	intel_gvt_hypervisor_read_gpa(vgpu, ring_context_gpa +
+	intel_gvt_read_gpa(vgpu, ring_context_gpa +
 			RING_CTX_OFF(rb_ctrl.val), &ctl, 4);
-	intel_gvt_hypervisor_read_gpa(vgpu, ring_context_gpa +
+	intel_gvt_read_gpa(vgpu, ring_context_gpa +
 			RING_CTX_OFF(ctx_ctrl.val), &ctx_ctl, 4);
 
 	if (!intel_gvt_ggtt_validate_range(vgpu, start,
@@ -1701,9 +1700,9 @@ intel_vgpu_create_workload(struct intel_vgpu *vgpu,
 	workload->rb_ctl = ctl;
 
 	if (engine->id == RCS0) {
-		intel_gvt_hypervisor_read_gpa(vgpu, ring_context_gpa +
+		intel_gvt_read_gpa(vgpu, ring_context_gpa +
 			RING_CTX_OFF(bb_per_ctx_ptr.val), &per_ctx, 4);
-		intel_gvt_hypervisor_read_gpa(vgpu, ring_context_gpa +
+		intel_gvt_read_gpa(vgpu, ring_context_gpa +
 			RING_CTX_OFF(rcs_indirect_ctx.val), &indirect_ctx, 4);
 
 		workload->wa_ctx.indirect_ctx.guest_gma =