[Intel-gfx] [PATCH 12/53] drm/i915/xehp: Handle new device context ID format

Matt Roper
2021-07-01T20:27:16Z

From: Stuart Summers <stuart.summers@intel.com>

Xe_HP changes the format of the context ID from past platforms.

Cc: Robert M. Fosha <robert.m.fosha@intel.com>
Signed-off-by: Stuart Summers <stuart.summers@intel.com>
Signed-off-by: Umesh Nerlige Ramappa <umesh.nerlige.ramappa@intel.com>
Signed-off-by: Matt Roper <matthew.d.roper@intel.com>
---
.../drm/i915/gt/intel_execlists_submission.c | 74 ++++++++++++++++---
drivers/gpu/drm/i915/gt/intel_lrc.c | 8 ++
drivers/gpu/drm/i915/gt/intel_lrc_reg.h | 2 +
drivers/gpu/drm/i915/i915_perf.c | 29 +++++---
drivers/gpu/drm/i915/i915_reg.h | 5 ++
5 files changed, 97 insertions(+), 21 deletions(-)

diff --git a/drivers/gpu/drm/i915/gt/intel_execlists_submission.c b/drivers/gpu/drm/i915/gt/intel_execlists_submission.c
index 15ba0d83151a..3a9d99a69ed4 100644
--- a/drivers/gpu/drm/i915/gt/intel_execlists_submission.c
+++ b/drivers/gpu/drm/i915/gt/intel_execlists_submission.c
@@ -153,6 +153,12 @@
#define GEN12_CSB_CTX_VALID(csb_dw) \
(FIELD_GET(GEN12_CSB_SW_CTX_ID_MASK, csb_dw) != GEN12_IDLE_CTX_ID)

+#define XEHP_CTX_STATUS_SWITCHED_TO_NEW_QUEUE BIT(1) /* upper csb dword */
+#define XEHP_CSB_SW_CTX_ID_MASK GENMASK(31, 10)
+#define XEHP_IDLE_CTX_ID 0xFFFF
+#define XEHP_CSB_CTX_VALID(csb_dw) \
+ (FIELD_GET(XEHP_CSB_SW_CTX_ID_MASK, csb_dw) != XEHP_IDLE_CTX_ID)
+
/* Typical size of the average request (2 pipecontrols and a MI_BB) */
#define EXECLISTS_REQUEST_SIZE 64 /* bytes */

@@ -490,6 +496,16 @@ __execlists_schedule_in(struct i915_request *rq)
/* Use a fixed tag for OA and friends */
GEM_BUG_ON(ce->tag <= BITS_PER_LONG);
ce->lrc.ccid = ce->tag;
+ } else if (GRAPHICS_VER_FULL(engine->i915) >= IP_VER(12, 50)) {
+ /* We don't need a strict matching tag, just different values */
+ unsigned int tag = ffs(READ_ONCE(engine->context_tag));
+
+ GEM_BUG_ON(tag == 0 || tag >= BITS_PER_LONG);
+ clear_bit(tag - 1, &engine->context_tag);
+ ce->lrc.ccid = tag << (XEHP_SW_CTX_ID_SHIFT - 32);
+
+ BUILD_BUG_ON(BITS_PER_LONG > GEN12_MAX_CONTEXT_HW_ID);
+
} else {
/* We don't need a strict matching tag, just different values */
unsigned int tag = __ffs(engine->context_tag);
@@ -600,8 +616,14 @@ static void __execlists_schedule_out(struct i915_request * const rq,
intel_engine_add_retire(engine, ce->timeline);

ccid = ce->lrc.ccid;
- ccid >>= GEN11_SW_CTX_ID_SHIFT - 32;
- ccid &= GEN12_MAX_CONTEXT_HW_ID;
+ if (GRAPHICS_VER_FULL(engine->i915) >= IP_VER(12, 50)) {
+ ccid >>= XEHP_SW_CTX_ID_SHIFT - 32;
+ ccid &= XEHP_MAX_CONTEXT_HW_ID;
+ } else {
+ ccid >>= GEN11_SW_CTX_ID_SHIFT - 32;
+ ccid &= GEN12_MAX_CONTEXT_HW_ID;
+ }
+
if (ccid < BITS_PER_LONG) {
GEM_BUG_ON(ccid == 0);
GEM_BUG_ON(test_bit(ccid - 1, &engine->context_tag));
@@ -1660,13 +1682,24 @@ static void invalidate_csb_entries(const u64 *first, const u64 *last)
* bits 44-46: reserved
* bits 47-57: sw context id of the lrc the GT switched away from
* bits 58-63: sw counter of the lrc the GT switched away from
+ *
+ * Xe_HP csb shuffles things around compared to TGL:
+ *
+ * bits 0-3: context switch detail (same possible values as TGL)
+ * bits 4-9: engine instance
+ * bits 10-25: sw context id of the lrc the GT switched to
+ * bits 26-31: sw counter of the lrc the GT switched to
+ * bit 32: semaphore wait mode (poll or signal), Only valid when
+ * switch detail is set to "wait on semaphore"
+ * bit 33: switched to new queue
+ * bits 34-41: wait detail (for switch detail 1 to 4)
+ * bits 42-57: sw context id of the lrc the GT switched away from
+ * bits 58-63: sw counter of the lrc the GT switched away from
*/
-static bool gen12_csb_parse(const u64 csb)
+static inline bool
+__gen12_csb_parse(bool ctx_to_valid, bool ctx_away_valid, bool new_queue,
+ u8 switch_detail)
{
- bool ctx_away_valid = GEN12_CSB_CTX_VALID(upper_32_bits(csb));
- bool new_queue =
- lower_32_bits(csb) & GEN12_CTX_STATUS_SWITCHED_TO_NEW_QUEUE;
-
/*
* The context switch detail is not guaranteed to be 5 when a preemption
* occurs, so we can't just check for that. The check below works for
@@ -1675,7 +1708,7 @@ static bool gen12_csb_parse(const u64 csb)
* would require some extra handling, but we don't support that.
*/
if (!ctx_away_valid || new_queue) {
- GEM_BUG_ON(!GEN12_CSB_CTX_VALID(lower_32_bits(csb)));
+ GEM_BUG_ON(!ctx_to_valid);
return true;
}

@@ -1684,10 +1717,26 @@ static bool gen12_csb_parse(const u64 csb)
* context switch on an unsuccessful wait instruction since we always
* use polling mode.
*/
- GEM_BUG_ON(GEN12_CTX_SWITCH_DETAIL(upper_32_bits(csb)));
+ GEM_BUG_ON(switch_detail);
return false;
}

+static bool xehp_csb_parse(const u64 csb)
+{
+ return __gen12_csb_parse(XEHP_CSB_CTX_VALID(lower_32_bits(csb)), /* cxt to */
+ XEHP_CSB_CTX_VALID(upper_32_bits(csb)), /* cxt away */
+ upper_32_bits(csb) & XEHP_CTX_STATUS_SWITCHED_TO_NEW_QUEUE,
+ GEN12_CTX_SWITCH_DETAIL(lower_32_bits(csb)));
+}
+
+static bool gen12_csb_parse(const u64 csb)
+{
+ return __gen12_csb_parse(GEN12_CSB_CTX_VALID(lower_32_bits(csb)), /* cxt to */
+ GEN12_CSB_CTX_VALID(upper_32_bits(csb)), /* cxt away */
+ lower_32_bits(csb) & GEN12_CTX_STATUS_SWITCHED_TO_NEW_QUEUE,
+ GEN12_CTX_SWITCH_DETAIL(upper_32_bits(csb)));
+}
+
static bool gen8_csb_parse(const u64 csb)
{
return csb & (GEN8_CTX_STATUS_IDLE_ACTIVE | GEN8_CTX_STATUS_PREEMPTED);
@@ -1852,7 +1901,9 @@ process_csb(struct intel_engine_cs *engine, struct i915_request **inactive)
ENGINE_TRACE(engine, "csb[%d]: status=0x%08x:0x%08x\n",
head, upper_32_bits(csb), lower_32_bits(csb));

- if (GRAPHICS_VER(engine->i915) >= 12)
+ if (GRAPHICS_VER_FULL(engine->i915) >= IP_VER(12, 50))
+ promote = xehp_csb_parse(csb);
+ else if (GRAPHICS_VER(engine->i915) >= 12)
promote = gen12_csb_parse(csb);
else
promote = gen8_csb_parse(csb);
@@ -3339,7 +3390,8 @@ int intel_execlists_submission_setup(struct intel_engine_cs *engine)
execlists->csb_size = GEN11_CSB_ENTRIES;

engine->context_tag = GENMASK(BITS_PER_LONG - 2, 0);
- if (GRAPHICS_VER(engine->i915) >= 11) {
+ if (GRAPHICS_VER(engine->i915) >= 11 &&
+ GRAPHICS_VER_FULL(engine->i915) < IP_VER(12, 50)) {
execlists->ccid |= engine->instance << (GEN11_ENGINE_INSTANCE_SHIFT - 32);
execlists->ccid |= engine->class << (GEN11_ENGINE_CLASS_SHIFT - 32);
}
diff --git a/drivers/gpu/drm/i915/gt/intel_lrc.c b/drivers/gpu/drm/i915/gt/intel_lrc.c
index a27bac0a4bfb..e1c80e2c06d8 100644
--- a/drivers/gpu/drm/i915/gt/intel_lrc.c
+++ b/drivers/gpu/drm/i915/gt/intel_lrc.c
@@ -1101,6 +1101,14 @@ setup_indirect_ctx_bb(const struct intel_context *ce,
* bits 55-60: SW counter
* bits 61-63: engine class
*
+ * On Xe_HP, the upper dword of the descriptor has a new format:
+ *
+ * bits 32-37: virtual function number
+ * bit 38: mbz, reserved for use by hardware
+ * bits 39-54: SW context ID
+ * bits 55-57: reserved
+ * bits 58-63: SW counter
+ *
* engine info, SW context ID and SW counter need to form a unique number
* (Context ID) per lrc.
*/
diff --git a/drivers/gpu/drm/i915/gt/intel_lrc_reg.h b/drivers/gpu/drm/i915/gt/intel_lrc_reg.h
index 41e5350a7a05..9548f4ade068 100644
--- a/drivers/gpu/drm/i915/gt/intel_lrc_reg.h
+++ b/drivers/gpu/drm/i915/gt/intel_lrc_reg.h
@@ -91,5 +91,7 @@
#define GEN11_MAX_CONTEXT_HW_ID (1 << 11) /* exclusive */
/* in Gen12 ID 0x7FF is reserved to indicate idle */
#define GEN12_MAX_CONTEXT_HW_ID (GEN11_MAX_CONTEXT_HW_ID - 1)
+/* in Xe_HP ID 0xFFFF is reserved to indicate "invalid context" */
+#define XEHP_MAX_CONTEXT_HW_ID 0xFFFF

#endif /* _INTEL_LRC_REG_H_ */
diff --git a/drivers/gpu/drm/i915/i915_perf.c b/drivers/gpu/drm/i915/i915_perf.c
index 9f94914958c3..1f8bf00526a1 100644
--- a/drivers/gpu/drm/i915/i915_perf.c
+++ b/drivers/gpu/drm/i915/i915_perf.c
@@ -1284,17 +1284,26 @@ static int oa_get_render_ctx_id(struct i915_perf_stream *stream)
break;

case 11:
- case 12: {
- stream->specific_ctx_id_mask =
- ((1U << GEN11_SW_CTX_ID_WIDTH) - 1) << (GEN11_SW_CTX_ID_SHIFT - 32);
- /*
- * Pick an unused context id
- * 0 - BITS_PER_LONG are used by other contexts
- * GEN12_MAX_CONTEXT_HW_ID (0x7ff) is used by idle context
- */
- stream->specific_ctx_id = (GEN12_MAX_CONTEXT_HW_ID - 1) << (GEN11_SW_CTX_ID_SHIFT - 32);
+ case 12:
+ if (GRAPHICS_VER_FULL(ce->engine->i915) >= IP_VER(12, 50)) {
+ stream->specific_ctx_id_mask =
+ ((1U << XEHP_SW_CTX_ID_WIDTH) - 1) <<
+ (XEHP_SW_CTX_ID_SHIFT - 32);
+ stream->specific_ctx_id =
+ (XEHP_MAX_CONTEXT_HW_ID - 1) <<
+ (XEHP_SW_CTX_ID_SHIFT - 32);
+ } else {
+ stream->specific_ctx_id_mask =
+ ((1U << GEN11_SW_CTX_ID_WIDTH) - 1) << (GEN11_SW_CTX_ID_SHIFT - 32);
+ /*
+ * Pick an unused context id
+ * 0 - BITS_PER_LONG are used by other contexts
+ * GEN12_MAX_CONTEXT_HW_ID (0x7ff) is used by idle context
+ */
+ stream->specific_ctx_id =
+ (GEN12_MAX_CONTEXT_HW_ID - 1) << (GEN11_SW_CTX_ID_SHIFT - 32);
+ }
break;
- }

default:
MISSING_CASE(GRAPHICS_VER(ce->engine->i915));
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index dbc233442dd0..c361a8f30531 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -4172,6 +4172,11 @@ enum {
#define GEN11_ENGINE_INSTANCE_SHIFT 48
#define GEN11_ENGINE_INSTANCE_WIDTH 6

+#define XEHP_SW_CTX_ID_SHIFT 39
+#define XEHP_SW_CTX_ID_WIDTH 16
+#define XEHP_SW_COUNTER_SHIFT 58
+#define XEHP_SW_COUNTER_WIDTH 6
+
#define CHV_CLK_CTL1 _MMIO(0x101100)
#define VLV_CLK_CTL2 _MMIO(0x101104)
#define CLK_CTL2_CZCOUNT_30NS_SHIFT 28