Re: [PATCH v4 2/2] drm/i915/icl: Define MOCS table for Icelake

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On 05/11/2018 05:50, Tomasz Lis wrote:

The table has been unified across OSes to minimize virtualization overhead.

The MOCS table is now published as part of bspec, and versioned. Entries
are supposed to never be modified, but new ones can be added. Adding
entries increases table version. The patch includes version 1 entries.

Meaning of each entry is now explained in bspec, and user mode clients
are expected to know what each entry means. The 3 entries used for previous
platforms are still compatible with their legacy definitions, but that is
not guaranteed to be true for future platforms.

v2: Fixed SCC values, improved commit comment (Daniele)
v3: Improved MOCS table comment (Daniele)
v4: Moved new entries below gen9 ones. Put common entries into
     definition to be used in multiple arrays. (Lucas)

BSpec: 34007
BSpec: 560
Signed-off-by: Tomasz Lis <tomasz.lis@xxxxxxxxx>
Reviewed-by: Daniele Ceraolo Spurio <daniele.ceraolospurio@xxxxxxxxx> (v3)
The table is the same as v3 and I'm ok with the new approach, so my r-b stands. 

Thanks,
Daniele


Cc: Joonas Lahtinen <joonas.lahtinen@xxxxxxxxxxxxxxx>
Cc: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
Cc: Mika Kuoppala <mika.kuoppala@xxxxxxxxx>
Cc: Daniele Ceraolo Spurio <daniele.ceraolospurio@xxxxxxxxx>
Cc: Zhenyu Wang <zhenyuw@xxxxxxxxxxxxxxx>
Cc: Zhi A Wang <zhi.a.wang@xxxxxxxxx>
Cc: Anuj Phogat <anuj.phogat@xxxxxxxxx>
Cc: Adam Cetnerowski <adam.cetnerowski@xxxxxxxxx>
Cc: Piotr Rozenfeld <piotr.rozenfeld@xxxxxxxxx>
Cc: Lucas De Marchi <lucas.demarchi@xxxxxxxxx>
---
  drivers/gpu/drm/i915/intel_mocs.c | 249 +++++++++++++++++++++++++++++++++++---
  1 file changed, 235 insertions(+), 14 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_mocs.c b/drivers/gpu/drm/i915/intel_mocs.c
index 76aed59..2a1e5f0 100644
--- a/drivers/gpu/drm/i915/intel_mocs.c
+++ b/drivers/gpu/drm/i915/intel_mocs.c
@@ -44,6 +44,8 @@ struct drm_i915_mocs_table {
  #define LE_SCC(value)		((value) << 8)
  #define LE_PFM(value)		((value) << 11)
  #define LE_SCF(value)		((value) << 14)
+#define LE_CoS(value)		((value) << 15)
+#define LE_SSE(value)		((value) << 17)
/* Defines for the tables (LNCFMOCS0 - LNCFMOCS31) - two entries per word */ 
  #define L3_ESC(value)		((value) << 0)
@@ -80,21 +82,21 @@ struct drm_i915_mocs_table {
   * LNCFCMOCS0 - LNCFCMOCS32 registers.
   *
   * These tables are intended to be kept reasonably consistent across
- * platforms. However some of the fields are not applicable to all of
- * them.
+ * HW platforms, and for ICL+, be identical across OSes. To achieve
+ * that, for Icelake and above, list of entries is published as part
+ * of bspec.
   *
   * Entries not part of the following tables are undefined as far as
- * userspace is concerned and shouldn't be relied upon.  For the time
- * being they will be implicitly initialized to the strictest caching
- * configuration (uncached) to guarantee forwards compatibility with
- * userspace programs written against more recent kernels providing
- * additional MOCS entries.
+ * userspace is concerned and shouldn't be relied upon.
   *
- * NOTE: These tables MUST start with being uncached and the length
- *       MUST be less than 63 as the last two registers are reserved
- *       by the hardware.  These tables are part of the kernel ABI and
- *       may only be updated incrementally by adding entries at the
- *       end.
+ * The last two entries are reserved by the hardware. For ICL+ they
+ * should be initialized according to bspec and never used, for older
+ * platforms they should never be written to.
+ *
+ * NOTE: These tables are part of bspec and defined as part of hardware
+ *       interface for ICL+. For older platforms, they are part of kernel
+ *       ABI. It is expected that existing entries will remain constant
+ *       and the tables will only be updated by adding new entries.
   */
#define GEN9_MOCS_TABLE \ 
@@ -144,6 +146,222 @@ static const struct drm_i915_mocs_entry broxton_mocs_table[] = {
  	},
  };
+#define GEN11_MOCS_TABLE \ 
+	[0] = { \
+	  /* Base - Uncached (Deprecated) */ \
+	  .control_value = LE_CACHEABILITY(LE_UC) | \
+			   LE_TGT_CACHE(LE_TC_LLC) | \
+			   LE_LRUM(0) | LE_AOM(0) | LE_RSC(0) | LE_SCC(0) | \
+			   LE_PFM(0) | LE_SCF(0) | LE_CoS(0) | LE_SSE(0), \
+	  .l3cc_value =    L3_ESC(0) | L3_SCC(0) | L3_CACHEABILITY(L3_UC), \
+	}, \
+	[1] = { \
+	  /* Base - L3 + LeCC:PAT (Deprecated) */ \
+	  .control_value = LE_CACHEABILITY(LE_PAGETABLE) | \
+			   LE_TGT_CACHE(LE_TC_LLC) | \
+			   LE_LRUM(0) | LE_AOM(0) | LE_RSC(0) | LE_SCC(0) | \
+			   LE_PFM(0) | LE_SCF(0) | LE_CoS(0) | LE_SSE(0), \
+	  .l3cc_value =    L3_ESC(0) | L3_SCC(0) | L3_CACHEABILITY(L3_WB), \
+	}, \
+	[2] = { \
+	  /* Base - L3 + LLC */ \
+	  .control_value = LE_CACHEABILITY(LE_WB) | \
+			   LE_TGT_CACHE(LE_TC_LLC) | \
+			   LE_LRUM(3) | LE_AOM(0) | LE_RSC(0) | LE_SCC(0) | \
+			   LE_PFM(0) | LE_SCF(0) | LE_CoS(0) | LE_SSE(0), \
+	  .l3cc_value =    L3_ESC(0) | L3_SCC(0) | L3_CACHEABILITY(L3_WB), \
+	}, \
+	[3] = { \
+	  /* Base - Uncached */ \
+	  .control_value = LE_CACHEABILITY(LE_UC) | \
+			   LE_TGT_CACHE(LE_TC_LLC) | \
+			   LE_LRUM(0) | LE_AOM(0) | LE_RSC(0) | LE_SCC(0) | \
+			   LE_PFM(0) | LE_SCF(0) | LE_CoS(0) | LE_SSE(0), \
+	  .l3cc_value =    L3_ESC(0) | L3_SCC(0) | L3_CACHEABILITY(L3_UC), \
+	}, \
+	[4] = { \
+	  /* Base - L3 */ \
+	  .control_value = LE_CACHEABILITY(LE_UC) | \
+			   LE_TGT_CACHE(LE_TC_LLC) | \
+			   LE_LRUM(0) | LE_AOM(0) | LE_RSC(0) | LE_SCC(0) | \
+			   LE_PFM(0) | LE_SCF(0) | LE_CoS(0) | LE_SSE(0), \
+	  .l3cc_value =    L3_ESC(0) | L3_SCC(0) | L3_CACHEABILITY(L3_WB), \
+	}, \
+	[5] = { \
+	  /* Base - LLC */ \
+	  .control_value = LE_CACHEABILITY(LE_WB) | \
+			   LE_TGT_CACHE(LE_TC_LLC) | \
+			   LE_LRUM(3) | LE_AOM(0) | LE_RSC(0) | LE_SCC(0) | \
+			   LE_PFM(0) | LE_SCF(0) | LE_CoS(0) | LE_SSE(0), \
+	  .l3cc_value =    L3_ESC(0) | L3_SCC(0) | L3_CACHEABILITY(L3_UC), \
+	}, \
+	[6] = { \
+	  /* Age 0 - LLC */ \
+	  .control_value = LE_CACHEABILITY(LE_WB) | \
+			   LE_TGT_CACHE(LE_TC_LLC) | \
+			   LE_LRUM(1) | LE_AOM(0) | LE_RSC(0) | LE_SCC(0) | \
+			   LE_PFM(0) | LE_SCF(0) | LE_CoS(0) | LE_SSE(0), \
+	  .l3cc_value =    L3_ESC(0) | L3_SCC(0) | L3_CACHEABILITY(L3_UC), \
+	}, \
+	[7] = { \
+	  /* Age 0 - L3 + LLC */ \
+	  .control_value = LE_CACHEABILITY(LE_WB) | \
+			   LE_TGT_CACHE(LE_TC_LLC) | \
+			   LE_LRUM(1) | LE_AOM(0) | LE_RSC(0) | LE_SCC(0) | \
+			   LE_PFM(0) | LE_SCF(0) | LE_CoS(0) | LE_SSE(0), \
+	  .l3cc_value =    L3_ESC(0) | L3_SCC(0) | L3_CACHEABILITY(L3_WB), \
+	}, \
+	[8] = { \
+	  /* Age: Don't Chg. - LLC */ \
+	  .control_value = LE_CACHEABILITY(LE_WB) | \
+			   LE_TGT_CACHE(LE_TC_LLC) | \
+			   LE_LRUM(2) | LE_AOM(0) | LE_RSC(0) | LE_SCC(0) | \
+			   LE_PFM(0) | LE_SCF(0) | LE_CoS(0) | LE_SSE(0), \
+	  .l3cc_value =    L3_ESC(0) | L3_SCC(0) | L3_CACHEABILITY(L3_UC), \
+	}, \
+	[9] = { \
+	  /* Age: Don't Chg. - L3 + LLC */ \
+	  .control_value = LE_CACHEABILITY(LE_WB) | \
+			   LE_TGT_CACHE(LE_TC_LLC) | \
+			   LE_LRUM(2) | LE_AOM(0) | LE_RSC(0) | LE_SCC(0) | \
+			   LE_PFM(0) | LE_SCF(0) | LE_CoS(0) | LE_SSE(0), \
+	  .l3cc_value =    L3_ESC(0) | L3_SCC(0) | L3_CACHEABILITY(L3_WB), \
+	}, \
+	[10] = { \
+	  /* No AOM - LLC */ \
+	  .control_value = LE_CACHEABILITY(LE_WB) | \
+			   LE_TGT_CACHE(LE_TC_LLC) | \
+			   LE_LRUM(3) | LE_AOM(1) | LE_RSC(0) | LE_SCC(0) | \
+			   LE_PFM(0) | LE_SCF(0) | LE_CoS(0) | LE_SSE(0), \
+	  .l3cc_value =    L3_ESC(0) | L3_SCC(0) | L3_CACHEABILITY(L3_UC), \
+	}, \
+	[11] = { \
+	  /* No AOM - L3 + LLC */ \
+	  .control_value = LE_CACHEABILITY(LE_WB) | \
+			   LE_TGT_CACHE(LE_TC_LLC) | \
+			   LE_LRUM(3) | LE_AOM(1) | LE_RSC(0) | LE_SCC(0) | \
+			   LE_PFM(0) | LE_SCF(0) | LE_CoS(0) | LE_SSE(0), \
+	  .l3cc_value =    L3_ESC(0) | L3_SCC(0) | L3_CACHEABILITY(L3_WB), \
+	}, \
+	[12] = { \
+	  /* No AOM; Age 0 - LLC */ \
+	  .control_value = LE_CACHEABILITY(LE_WB) | \
+			   LE_TGT_CACHE(LE_TC_LLC) | \
+			   LE_LRUM(1) | LE_AOM(1) | LE_RSC(0) | LE_SCC(0) | \
+			   LE_PFM(0) | LE_SCF(0) | LE_CoS(0) | LE_SSE(0), \
+	  .l3cc_value =    L3_ESC(0) | L3_SCC(0) | L3_CACHEABILITY(L3_UC), \
+	}, \
+	[13] = { \
+	  /* No AOM; Age 0 - L3 + LLC */ \
+	  .control_value = LE_CACHEABILITY(LE_WB) | \
+			   LE_TGT_CACHE(LE_TC_LLC) | \
+			   LE_LRUM(1) | LE_AOM(1) | LE_RSC(0) | LE_SCC(0) | \
+			   LE_PFM(0) | LE_SCF(0) | LE_CoS(0) | LE_SSE(0), \
+	  .l3cc_value =    L3_ESC(0) | L3_SCC(0) | L3_CACHEABILITY(L3_WB), \
+	}, \
+	[14] = { \
+	  /* No AOM; Age:DC - LLC */ \
+	  .control_value = LE_CACHEABILITY(LE_WB) | \
+			   LE_TGT_CACHE(LE_TC_LLC) | \
+			   LE_LRUM(2) | LE_AOM(1) | LE_RSC(0) | LE_SCC(0) | \
+			   LE_PFM(0) | LE_SCF(0) | LE_CoS(0) | LE_SSE(0), \
+	  .l3cc_value =    L3_ESC(0) | L3_SCC(0) | L3_CACHEABILITY(L3_UC), \
+	}, \
+	[15] = { \
+	  /* No AOM; Age:DC - L3 + LLC */ \
+	  .control_value = LE_CACHEABILITY(LE_WB) | \
+			   LE_TGT_CACHE(LE_TC_LLC) | \
+			   LE_LRUM(2) | LE_AOM(1) | LE_RSC(0) | LE_SCC(0) | \
+			   LE_PFM(0) | LE_SCF(0) | LE_CoS(0) | LE_SSE(0), \
+	  .l3cc_value =    L3_ESC(0) | L3_SCC(0) | L3_CACHEABILITY(L3_WB), \
+	}, \
+	[18] = { \
+	  /* Self-Snoop - L3 + LLC */ \
+	  .control_value = LE_CACHEABILITY(LE_WB) | \
+			   LE_TGT_CACHE(LE_TC_LLC) | \
+			   LE_LRUM(3) | LE_AOM(0) | LE_RSC(0) | LE_SCC(0) | \
+			   LE_PFM(0) | LE_SCF(0) | LE_CoS(0) | LE_SSE(3), \
+	  .l3cc_value =    L3_ESC(0) | L3_SCC(0) | L3_CACHEABILITY(L3_WB), \
+	}, \
+	[19] = { \
+	  /* Skip Caching - L3 + LLC(12.5%) */ \
+	  .control_value = LE_CACHEABILITY(LE_WB) | \
+			   LE_TGT_CACHE(LE_TC_LLC) | \
+			   LE_LRUM(3) | LE_AOM(0) | LE_RSC(0) | LE_SCC(7) | \
+			   LE_PFM(0) | LE_SCF(0) | LE_CoS(0) | LE_SSE(0), \
+	  .l3cc_value =    L3_ESC(0) | L3_SCC(0) | L3_CACHEABILITY(L3_WB), \
+	}, \
+	[20] = { \
+	  /* Skip Caching - L3 + LLC(25%) */ \
+	  .control_value = LE_CACHEABILITY(LE_WB) | \
+			   LE_TGT_CACHE(LE_TC_LLC) | \
+			   LE_LRUM(3) | LE_AOM(0) | LE_RSC(0) | LE_SCC(3) | \
+			   LE_PFM(0) | LE_SCF(0) | LE_CoS(0) | LE_SSE(0), \
+	  .l3cc_value =    L3_ESC(0) | L3_SCC(0) | L3_CACHEABILITY(L3_WB), \
+	}, \
+	[21] = { \
+	  /* Skip Caching - L3 + LLC(50%) */ \
+	  .control_value = LE_CACHEABILITY(LE_WB) | \
+			   LE_TGT_CACHE(LE_TC_LLC) | \
+			   LE_LRUM(3) | LE_AOM(0) | LE_RSC(0) | LE_SCC(1) | \
+			   LE_PFM(0) | LE_SCF(0) | LE_CoS(0) | LE_SSE(0), \
+	  .l3cc_value =    L3_ESC(0) | L3_SCC(0) | L3_CACHEABILITY(L3_WB), \
+	}, \
+	[22] = { \
+	  /* Skip Caching - L3 + LLC(75%) */ \
+	  .control_value = LE_CACHEABILITY(LE_WB) | \
+			   LE_TGT_CACHE(LE_TC_LLC) | \
+			   LE_LRUM(3) | LE_AOM(0) | LE_RSC(1) | LE_SCC(3) | \
+			   LE_PFM(0) | LE_SCF(0) | LE_CoS(0) | LE_SSE(0), \
+	  .l3cc_value =    L3_ESC(0) | L3_SCC(0) | L3_CACHEABILITY(L3_WB), \
+	}, \
+	[23] = { \
+	  /* Skip Caching - L3 + LLC(87.5%) */ \
+	  .control_value = LE_CACHEABILITY(LE_WB) | \
+			   LE_TGT_CACHE(LE_TC_LLC) | \
+			   LE_LRUM(3) | LE_AOM(0) | LE_RSC(1) | LE_SCC(7) | \
+			   LE_PFM(0) | LE_SCF(0) | LE_CoS(0) | LE_SSE(0), \
+	  .l3cc_value =    L3_ESC(0) | L3_SCC(0) | L3_CACHEABILITY(L3_WB), \
+	}, \
+	[62] = { \
+	  /* HW Reserved - SW program but never use */ \
+	  .control_value = LE_CACHEABILITY(LE_WB) | \
+			   LE_TGT_CACHE(LE_TC_LLC) | \
+			   LE_LRUM(3) | LE_AOM(0) | LE_RSC(0) | LE_SCC(0) | \
+			   LE_PFM(0) | LE_SCF(0) | LE_CoS(0) | LE_SSE(0), \
+	  .l3cc_value =    L3_ESC(0) | L3_SCC(0) | L3_CACHEABILITY(L3_UC), \
+	}, \
+	[63] = { \
+	  /* HW Reserved - SW program but never use */ \
+	  .control_value = LE_CACHEABILITY(LE_WB) | \
+			   LE_TGT_CACHE(LE_TC_LLC) | \
+			   LE_LRUM(3) | LE_AOM(0) | LE_RSC(0) | LE_SCC(0) | \
+			   LE_PFM(0) | LE_SCF(0) | LE_CoS(0) | LE_SSE(0), \
+	  .l3cc_value =    L3_ESC(0) | L3_SCC(0) | L3_CACHEABILITY(L3_UC), \
+	},
+
+static const struct drm_i915_mocs_entry icelake_mocs_table[] = {
+	GEN11_MOCS_TABLE
+	[16] = {
+	  /* Reserved - For future use */
+	  .control_value = LE_CACHEABILITY(LE_PAGETABLE) |
+			   LE_TGT_CACHE(LE_TC_PAGETABLE) |
+			   LE_LRUM(0) | LE_AOM(0) | LE_RSC(0) | LE_SCC(0) |
+			   LE_PFM(0) | LE_SCF(0) | LE_CoS(0) | LE_SSE(0),
+
+	  .l3cc_value =    L3_ESC(0) | L3_SCC(0) | L3_CACHEABILITY(L3_DIRECT),
+	},
+	[17] = {
+	  /* Reserved - For future use */
+	  .control_value = LE_CACHEABILITY(LE_PAGETABLE) |
+			   LE_TGT_CACHE(LE_TC_PAGETABLE) |
+			   LE_LRUM(0) | LE_AOM(0) | LE_RSC(0) | LE_SCC(0) |
+			   LE_PFM(0) | LE_SCF(0) | LE_CoS(0) | LE_SSE(0),
+
+	  .l3cc_value =    L3_ESC(0) | L3_SCC(0) | L3_CACHEABILITY(L3_DIRECT),
+	},
+};
+
  /**
   * get_mocs_settings()
   * @dev_priv:	i915 device.
@@ -161,8 +379,11 @@ static bool get_mocs_settings(struct drm_i915_private *dev_priv,
  {
  	bool result = false;
- if (IS_GEN9_BC(dev_priv) || IS_CANNONLAKE(dev_priv) || 
-	    IS_ICELAKE(dev_priv)) {
+	if (IS_ICELAKE(dev_priv)) {
+		table->size  = ARRAY_SIZE(icelake_mocs_table);
+		table->table = icelake_mocs_table;
+		result = true;
+	} else if (IS_GEN9_BC(dev_priv) || IS_CANNONLAKE(dev_priv)) {
  		table->size  = ARRAY_SIZE(skylake_mocs_table);
  		table->table = skylake_mocs_table;
  		result = true;


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