drm/i915/gvt: Remove duplicated MMIO entries

Remove duplicated MMIO entries in the tracked MMIO list. -EEXIST
is returned if duplicated MMIO entries are found when new MMIO
entry is added.

v2:
- Use WARN(1, ...) for more verbose message. (Zhenyu)

Signed-off-by: Jian Jun Chen <jian.jun.chen@intel.com>
Cc: Zhi Wang <zhi.a.wang@intel.com>
Cc: Changbin Du <changbin.du@intel.com>
Cc: Zhenyu Wang <zhenyuw@linux.intel.com>
Reviewed-by: Yulei Zhang <yulei.zhang@intel.com>
Signed-off-by: Zhenyu Wang <zhenyuw@linux.intel.com>

1 files changed, 10 insertions, 8 deletions

diff --git a/drivers/gpu/drm/i915/gvt/handlers.c b/drivers/gpu/drm/i915/gvt/handlers.c
index aeecf315c5db..d85264d48585 100644
--- a/drivers/gpu/drm/i915/gvt/handlers.c
+++ b/drivers/gpu/drm/i915/gvt/handlers.c
@@ -113,9 +113,17 @@ static int new_mmio_info(struct intel_gvt *gvt,
 
                 info->offset = i;
                 p = find_mmio_info(gvt, info->offset);
-                if (p)
-                        gvt_err("dup mmio definition offset %x\n",
+                if (p) {
+                        WARN(1, "dup mmio definition offset %x\n",
                                 info->offset);
+                        kfree(info);
+
+                        /* We return -EEXIST here to make GVT-g load fail.
+                         * So duplicated MMIO can be found as soon as
+                         * possible.
+                         */
+                        return -EEXIST;
+                }
 
                 info->ro_mask = ro_mask;
                 info->device = device;
@@ -2583,7 +2591,6 @@ static int init_broadwell_mmio_info(struct intel_gvt *gvt)
         MMIO_F(0x24d0, 48, F_CMD_ACCESS, 0, 0, D_BDW_PLUS,
                 NULL, force_nonpriv_write);
 
-        MMIO_D(0x22040, D_BDW_PLUS);
         MMIO_D(0x44484, D_BDW_PLUS);
         MMIO_D(0x4448c, D_BDW_PLUS);
 
@@ -2641,7 +2648,6 @@ static int init_skl_mmio_info(struct intel_gvt *gvt)
         MMIO_D(HSW_PWR_WELL_BIOS, D_SKL_PLUS);
         MMIO_DH(HSW_PWR_WELL_DRIVER, D_SKL_PLUS, NULL,
                                                 skl_power_well_ctl_write);
-        MMIO_DH(GEN6_PCODE_MAILBOX, D_SKL_PLUS, NULL, mailbox_write);
 
         MMIO_D(0xa210, D_SKL_PLUS);
         MMIO_D(GEN9_MEDIA_PG_IDLE_HYSTERESIS, D_SKL_PLUS);
@@ -2833,7 +2839,6 @@ static int init_skl_mmio_info(struct intel_gvt *gvt)
         MMIO_D(0x320f0, D_SKL | D_KBL);
 
         MMIO_DFH(_REG_VCS2_EXCC, D_SKL_PLUS, F_CMD_ACCESS, NULL, NULL);
-        MMIO_DFH(_REG_VECS_EXCC, D_SKL_PLUS, F_CMD_ACCESS, NULL, NULL);
         MMIO_D(0x70034, D_SKL_PLUS);
         MMIO_D(0x71034, D_SKL_PLUS);
         MMIO_D(0x72034, D_SKL_PLUS);
@@ -2851,10 +2856,7 @@ static int init_skl_mmio_info(struct intel_gvt *gvt)
                 NULL, NULL);
 
         MMIO_D(0x4ab8, D_KBL);
-        MMIO_D(0x940c, D_SKL_PLUS);
         MMIO_D(0x2248, D_SKL_PLUS | D_KBL);
-        MMIO_D(0x4ab0, D_SKL | D_KBL);
-        MMIO_D(0x20d4, D_SKL | D_KBL);
 
         return 0;
 }