@@ -3149,6 +3149,7 @@ static int init_bdw_mmio_info(struct intel_gvt *gvt)
MMIO_DFH(_MMIO(0xb100), D_BDW, F_CMD_ACCESS, NULL, NULL);
MMIO_DFH(_MMIO(0xb10c), D_BDW, F_CMD_ACCESS, NULL, NULL);
MMIO_D(_MMIO(0xb110), D_BDW);
+ MMIO_D(GEN9_SCRATCH_LNCF1, D_BDW_PLUS);
MMIO_F(_MMIO(0x24d0), 48, F_CMD_ACCESS | F_CMD_WRITE_PATCH, 0, 0,
D_BDW_PLUS, NULL, force_nonpriv_write);
@@ -105,6 +105,8 @@ static struct engine_mmio gen9_engine_mmio_list[] __cacheline_aligned = {
{RCS0, COMMON_SLICE_CHICKEN2, 0xffff, true}, /* 0x7014 */
{RCS0, GEN9_CS_DEBUG_MODE1, 0xffff, false}, /* 0x20ec */
{RCS0, GEN8_L3SQCREG4, 0, false}, /* 0xb118 */
+ {RCS0, GEN9_SCRATCH1, 0, false}, /* 0xb11c */
+ {RCS0, GEN9_SCRATCH_LNCF1, 0, false}, /* 0xb008 */
{RCS0, GEN7_HALF_SLICE_CHICKEN1, 0xffff, true}, /* 0xe100 */
{RCS0, HALF_SLICE_CHICKEN2, 0xffff, true}, /* 0xe180 */
{RCS0, HALF_SLICE_CHICKEN3, 0xffff, true}, /* 0xe184 */
We've seen recent regression with host and windows VM running simultaneously that cause gpu hang or even crash. Finally bisect to commit 58586680ffad ("drm/i915: Disable atomics in L3 for gen9"), which seems cached atomics behavior difference caused regression issue. This tries to add new scratch register handler and add those in mmio save/restore list for context switch. No gpu hang produced with this one. Cc: stable@vger.kernel.org # 5.12+ Cc: "Xu, Terrence" <terrence.xu@intel.com> Cc: "Bloomfield, Jon" <jon.bloomfield@intel.com> Cc: "Ekstrand, Jason" <jason.ekstrand@intel.com> Fixes: 58586680ffad ("drm/i915: Disable atomics in L3 for gen9") Signed-off-by: Zhenyu Wang <zhenyuw@linux.intel.com> --- drivers/gpu/drm/i915/gvt/handlers.c | 1 + drivers/gpu/drm/i915/gvt/mmio_context.c | 2 ++ 2 files changed, 3 insertions(+)