commit cd7e61b93d068a80bfe6cb55bf00f17332d831a1 upstream.

There is one issue relates to Coarse Power Gating(CPG) on KBL NUC in GVT-g, vgpu can't get the correct default context by updating the registers before inhibit context submission. It always get back the hardware default value unless the inhibit context submission happened before the 1st time forcewake put. With this wrong default context, vgpu will run with incorrect state and meet unknown issues.

The solution is initialize these mmios by adding lri command in ring buffer of the inhibit context, then gpu hardware has no chance to go down RC6 when lri commands are right being executed, and then vgpu can get correct default context for further use.

v3: - fix code fault, use 'for' to loop through mmio render list(Zhenyu)

v4: - save the count of engine mmio need to be restored for inhibit context and refine some comments. (Kevin)

v5: - code rebase

Cc: stable@vger.kernel.org # v4.16 Cc: Kevin Tian kevin.tian@intel.com Cc: Zhenyu Wang zhenyuw@linux.intel.com Signed-off-by: Weinan Li weinan.z.li@intel.com Signed-off-by: Zhenyu Wang zhenyuw@linux.intel.com Signed-off-by: Changbin Du changbin.du@intel.com --- drivers/gpu/drm/i915/gvt/gvt.h | 5 +- drivers/gpu/drm/i915/gvt/mmio_context.c | 210 +++++++++++++++++++++++++++++--- drivers/gpu/drm/i915/gvt/mmio_context.h | 5 + drivers/gpu/drm/i915/gvt/scheduler.c | 5 + 4 files changed, 205 insertions(+), 20 deletions(-)

diff --git a/drivers/gpu/drm/i915/gvt/gvt.h b/drivers/gpu/drm/i915/gvt/gvt.h index c6197d9..d35b93f 100644 --- a/drivers/gpu/drm/i915/gvt/gvt.h +++ b/drivers/gpu/drm/i915/gvt/gvt.h @@ -308,7 +308,10 @@ struct intel_gvt { wait_queue_head_t service_thread_wq; unsigned long service_request;

- struct engine_mmio *engine_mmio_list; + struct { + struct engine_mmio *mmio; + int ctx_mmio_count[I915_NUM_ENGINES]; + } engine_mmio_list;

struct dentry *debugfs_root; }; diff --git a/drivers/gpu/drm/i915/gvt/mmio_context.c b/drivers/gpu/drm/i915/gvt/mmio_context.c index 152df3d..c44dba3 100644 --- a/drivers/gpu/drm/i915/gvt/mmio_context.c +++ b/drivers/gpu/drm/i915/gvt/mmio_context.c @@ -50,6 +50,8 @@ #define RING_GFX_MODE(base) _MMIO((base) + 0x29c) #define VF_GUARDBAND _MMIO(0x83a4)

+#define GEN9_MOCS_SIZE 64 + /* Raw offset is appened to each line for convenience. */ static struct engine_mmio gen8_engine_mmio_list[] __cacheline_aligned = { {RCS, GFX_MODE_GEN7, 0xffff, false}, /* 0x229c */ @@ -152,8 +154,8 @@ static struct engine_mmio gen9_engine_mmio_list[] __cacheline_aligned = {

static struct { bool initialized; - u32 control_table[I915_NUM_ENGINES][64]; - u32 l3cc_table[32]; + u32 control_table[I915_NUM_ENGINES][GEN9_MOCS_SIZE]; + u32 l3cc_table[GEN9_MOCS_SIZE / 2]; } gen9_render_mocs;

static void load_render_mocs(struct drm_i915_private *dev_priv) @@ -170,7 +172,7 @@ static void load_render_mocs(struct drm_i915_private *dev_priv)

for (ring_id = 0; ring_id < ARRAY_SIZE(regs); ring_id++) { offset.reg = regs[ring_id]; - for (i = 0; i < 64; i++) { + for (i = 0; i < GEN9_MOCS_SIZE; i++) { gen9_render_mocs.control_table[ring_id][i] = I915_READ_FW(offset); offset.reg += 4; @@ -178,7 +180,7 @@ static void load_render_mocs(struct drm_i915_private *dev_priv) }

offset.reg = 0xb020; - for (i = 0; i < 32; i++) { + for (i = 0; i < GEN9_MOCS_SIZE / 2; i++) { gen9_render_mocs.l3cc_table[i] = I915_READ_FW(offset); offset.reg += 4; @@ -186,6 +188,153 @@ static void load_render_mocs(struct drm_i915_private *dev_priv) gen9_render_mocs.initialized = true; }

+static int +restore_context_mmio_for_inhibit(struct intel_vgpu *vgpu, + struct drm_i915_gem_request *req) +{ + u32 *cs; + int ret; + struct engine_mmio *mmio; + struct intel_gvt *gvt = vgpu->gvt; + int ring_id = req->engine->id; + int count = gvt->engine_mmio_list.ctx_mmio_count[ring_id]; + + if (count == 0) + return 0; + + ret = req->engine->emit_flush(req, EMIT_BARRIER); + if (ret) + return ret; + + cs = intel_ring_begin(req, count * 2 + 2); + if (IS_ERR(cs)) + return PTR_ERR(cs); + + *cs++ = MI_LOAD_REGISTER_IMM(count); + for (mmio = gvt->engine_mmio_list.mmio; + i915_mmio_reg_valid(mmio->reg); mmio++) { + if (mmio->ring_id != ring_id || + !mmio->in_context) + continue; + + *cs++ = i915_mmio_reg_offset(mmio->reg); + *cs++ = vgpu_vreg_t(vgpu, mmio->reg) | + (mmio->mask << 16); + gvt_dbg_core("add lri reg pair 0x%x:0x%x in inhibit ctx, vgpu:%d, rind_id:%d\n", + *(cs-2), *(cs-1), vgpu->id, ring_id); + } + + *cs++ = MI_NOOP; + intel_ring_advance(req, cs); + + ret = req->engine->emit_flush(req, EMIT_BARRIER); + if (ret) + return ret; + + return 0; +} + +static int +restore_render_mocs_control_for_inhibit(struct intel_vgpu *vgpu, + struct drm_i915_gem_request *req) +{ + unsigned int index; + u32 *cs; + + cs = intel_ring_begin(req, 2 * GEN9_MOCS_SIZE + 2); + if (IS_ERR(cs)) + return PTR_ERR(cs); + + *cs++ = MI_LOAD_REGISTER_IMM(GEN9_MOCS_SIZE); + + for (index = 0; index < GEN9_MOCS_SIZE; index++) { + *cs++ = i915_mmio_reg_offset(GEN9_GFX_MOCS(index)); + *cs++ = vgpu_vreg_t(vgpu, GEN9_GFX_MOCS(index)); + gvt_dbg_core("add lri reg pair 0x%x:0x%x in inhibit ctx, vgpu:%d, rind_id:%d\n", + *(cs-2), *(cs-1), vgpu->id, req->engine->id); + + } + + *cs++ = MI_NOOP; + intel_ring_advance(req, cs); + + return 0; +} + +static int +restore_render_mocs_l3cc_for_inhibit(struct intel_vgpu *vgpu, + struct drm_i915_gem_request *req) +{ + unsigned int index; + u32 *cs; + + cs = intel_ring_begin(req, 2 * GEN9_MOCS_SIZE / 2 + 2); + if (IS_ERR(cs)) + return PTR_ERR(cs); + + *cs++ = MI_LOAD_REGISTER_IMM(GEN9_MOCS_SIZE / 2); + + for (index = 0; index < GEN9_MOCS_SIZE / 2; index++) { + *cs++ = i915_mmio_reg_offset(GEN9_LNCFCMOCS(index)); + *cs++ = vgpu_vreg_t(vgpu, GEN9_LNCFCMOCS(index)); + gvt_dbg_core("add lri reg pair 0x%x:0x%x in inhibit ctx, vgpu:%d, rind_id:%d\n", + *(cs-2), *(cs-1), vgpu->id, req->engine->id); + + } + + *cs++ = MI_NOOP; + intel_ring_advance(req, cs); + + return 0; +} + +/* + * Use lri command to initialize the mmio which is in context state image for + * inhibit context, it contains tracked engine mmio, render_mocs and + * render_mocs_l3cc. + */ +int intel_vgpu_restore_inhibit_context(struct intel_vgpu *vgpu, + struct drm_i915_gem_request *req) +{ + int ret; + u32 *cs; + + cs = intel_ring_begin(req, 2); + if (IS_ERR(cs)) + return PTR_ERR(cs); + + *cs++ = MI_ARB_ON_OFF | MI_ARB_DISABLE; + *cs++ = MI_NOOP; + intel_ring_advance(req, cs); + + ret = restore_context_mmio_for_inhibit(vgpu, req); + if (ret) + goto out; + + /* no MOCS register in context except render engine */ + if (req->engine->id != RCS) + goto out; + + ret = restore_render_mocs_control_for_inhibit(vgpu, req); + if (ret) + goto out; + + ret = restore_render_mocs_l3cc_for_inhibit(vgpu, req); + if (ret) + goto out; + +out: + cs = intel_ring_begin(req, 2); + if (IS_ERR(cs)) + return PTR_ERR(cs); + + *cs++ = MI_ARB_ON_OFF | MI_ARB_ENABLE; + *cs++ = MI_NOOP; + intel_ring_advance(req, cs); + + return ret; +} + static void handle_tlb_pending_event(struct intel_vgpu *vgpu, int ring_id) { struct drm_i915_private *dev_priv = vgpu->gvt->dev_priv; @@ -252,11 +401,14 @@ static void switch_mocs(struct intel_vgpu *pre, struct intel_vgpu *next, if (WARN_ON(ring_id >= ARRAY_SIZE(regs))) return;

+ if (IS_KABYLAKE(dev_priv) && ring_id == RCS) + return; + if (!pre && !gen9_render_mocs.initialized) load_render_mocs(dev_priv);

offset.reg = regs[ring_id]; - for (i = 0; i < 64; i++) { + for (i = 0; i < GEN9_MOCS_SIZE; i++) { if (pre) old_v = vgpu_vreg_t(pre, offset); else @@ -274,7 +426,7 @@ static void switch_mocs(struct intel_vgpu *pre, struct intel_vgpu *next,

if (ring_id == RCS) { l3_offset.reg = 0xb020; - for (i = 0; i < 32; i++) { + for (i = 0; i < GEN9_MOCS_SIZE / 2; i++) { if (pre) old_v = vgpu_vreg_t(pre, l3_offset); else @@ -294,6 +446,16 @@ static void switch_mocs(struct intel_vgpu *pre, struct intel_vgpu *next,

#define CTX_CONTEXT_CONTROL_VAL 0x03

+bool is_inhibit_context(struct i915_gem_context *ctx, int ring_id) +{ + u32 *reg_state = ctx->engine[ring_id].lrc_reg_state; + u32 inhibit_mask = + _MASKED_BIT_ENABLE(CTX_CTRL_ENGINE_CTX_RESTORE_INHIBIT); + + return inhibit_mask == + (reg_state[CTX_CONTEXT_CONTROL_VAL] & inhibit_mask); +} + /* Switch ring mmio values (context). */ static void switch_mmio(struct intel_vgpu *pre, struct intel_vgpu *next, @@ -301,9 +463,6 @@ static void switch_mmio(struct intel_vgpu *pre, { struct drm_i915_private *dev_priv; struct intel_vgpu_submission *s; - u32 *reg_state, ctx_ctrl; - u32 inhibit_mask = - _MASKED_BIT_ENABLE(CTX_CTRL_ENGINE_CTX_RESTORE_INHIBIT); struct engine_mmio *mmio; u32 old_v, new_v;

@@ -311,10 +470,18 @@ static void switch_mmio(struct intel_vgpu *pre, if (IS_SKYLAKE(dev_priv) || IS_KABYLAKE(dev_priv)) switch_mocs(pre, next, ring_id);

- for (mmio = dev_priv->gvt->engine_mmio_list; + for (mmio = dev_priv->gvt->engine_mmio_list.mmio; i915_mmio_reg_valid(mmio->reg); mmio++) { if (mmio->ring_id != ring_id) continue; + /* + * No need to do save or restore of the mmio which is in context + * state image on kabylake, it's initialized by lri command and + * save or restore with context together. + */ + if (IS_KABYLAKE(dev_priv) && mmio->in_context) + continue; + // save if (pre) { vgpu_vreg_t(pre, mmio->reg) = I915_READ_FW(mmio->reg); @@ -328,16 +495,13 @@ static void switch_mmio(struct intel_vgpu *pre, // restore if (next) { s = &next->submission; - reg_state = - s->shadow_ctx->engine[ring_id].lrc_reg_state; - ctx_ctrl = reg_state[CTX_CONTEXT_CONTROL_VAL]; /* - * if it is an inhibit context, load in_context mmio - * into HW by mmio write. If it is not, skip this mmio - * write. + * No need to restore the mmio which is in context state + * image if it's not inhibit context, it will restore + * itself. */ if (mmio->in_context && - (ctx_ctrl & inhibit_mask) != inhibit_mask) + !is_inhibit_context(s->shadow_ctx, ring_id)) continue;

if (mmio->mask) @@ -408,8 +572,16 @@ void intel_gvt_switch_mmio(struct intel_vgpu *pre, */ void intel_gvt_init_engine_mmio_context(struct intel_gvt *gvt) { + struct engine_mmio *mmio; + if (IS_SKYLAKE(gvt->dev_priv) || IS_KABYLAKE(gvt->dev_priv)) - gvt->engine_mmio_list = gen9_engine_mmio_list; + gvt->engine_mmio_list.mmio = gen9_engine_mmio_list; else - gvt->engine_mmio_list = gen8_engine_mmio_list; + gvt->engine_mmio_list.mmio = gen8_engine_mmio_list; + + for (mmio = gvt->engine_mmio_list.mmio; + i915_mmio_reg_valid(mmio->reg); mmio++) { + if (mmio->in_context) + gvt->engine_mmio_list.ctx_mmio_count[mmio->ring_id]++; + } } diff --git a/drivers/gpu/drm/i915/gvt/mmio_context.h b/drivers/gpu/drm/i915/gvt/mmio_context.h index ca2c6a7..0b1d985 100644 --- a/drivers/gpu/drm/i915/gvt/mmio_context.h +++ b/drivers/gpu/drm/i915/gvt/mmio_context.h @@ -49,4 +49,9 @@ void intel_gvt_switch_mmio(struct intel_vgpu *pre,

void intel_gvt_init_engine_mmio_context(struct intel_gvt *gvt);

+bool is_inhibit_context(struct i915_gem_context *ctx, int ring_id); + +int intel_vgpu_restore_inhibit_context(struct intel_vgpu *vgpu, + struct drm_i915_gem_request *req); + #endif diff --git a/drivers/gpu/drm/i915/gvt/scheduler.c b/drivers/gpu/drm/i915/gvt/scheduler.c index d74d6f0..88b7b47 100644 --- a/drivers/gpu/drm/i915/gvt/scheduler.c +++ b/drivers/gpu/drm/i915/gvt/scheduler.c @@ -275,6 +275,11 @@ static int copy_workload_to_ring_buffer(struct intel_vgpu_workload *workload) struct intel_vgpu *vgpu = workload->vgpu; void *shadow_ring_buffer_va; u32 *cs; + struct drm_i915_gem_request *req = workload->req; + + if (IS_KABYLAKE(req->i915) && + is_inhibit_context(req->ctx, req->engine->id)) + intel_vgpu_restore_inhibit_context(vgpu, req);

/* allocate shadow ring buffer */ cs = intel_ring_begin(workload->req, workload->rb_len / sizeof(u32));