i965: Import tables enumerating the set of validated L3 configurations.

It should be possible to use additional L3 configurations other than
the ones listed in the tables of validated allocations ("BSpec »
3D-Media-GPGPU Engine » L3 Cache and URB [IVB+] » L3 Cache and URB [*]
» L3 Allocation and Programming"), but it seems sensible for now to
hard-code the tables in order to stick to the hardware docs.  Instead
of setting up the arbitrary L3 partitioning given as input, the
closest validated L3 configuration will be looked up in these tables
and used to program the hardware.

The included tables should work for Gen7-9.  Note that the quantities
are specified in ways rather than in KB, this is because the L3
control registers expect the value in ways, and because by doing that
we can re-use a single table for all GT variants of the same
generation (and in the case of IVB/HSW and CHV/SKL across different
generations) which generally have different L3 way sizes but allow the
same combinations of way allocations.

v2: Use slice count from the devinfo structure instead of the gt
    number to implement get_l3_way_size().

Reviewed-by: Samuel Iglesias Gonsálvez <[email protected]>
Acked-by: Kenneth Graunke <[email protected]>
Reviewed-by: Kristian Høgsberg  <[email protected]>

2 files changed, 168 insertions, 0 deletions

diff --git a/src/mesa/drivers/dri/i965/Makefile.sources b/src/mesa/drivers/dri/i965/Makefile.sources
index 29f0b755ad7..3ab143d4a16 100644
--- a/src/mesa/drivers/dri/i965/Makefile.sources
+++ b/src/mesa/drivers/dri/i965/Makefile.sources
@@ -183,6 +183,7 @@ i965_FILES = \
 	gen7_ds_state.c \
 	gen7_gs_state.c \
 	gen7_hs_state.c \
+	gen7_l3_state.c \
 	gen7_misc_state.c \
 	gen7_sf_state.c \
 	gen7_sol_state.c \
diff --git a/src/mesa/drivers/dri/i965/gen7_l3_state.c b/src/mesa/drivers/dri/i965/gen7_l3_state.c
new file mode 100644
index 00000000000..ac4c93b1888
--- /dev/null
+++ b/src/mesa/drivers/dri/i965/gen7_l3_state.c
@@ -0,0 +1,167 @@
+/*
+ * Copyright (c) 2015 Intel Corporation
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ */
+
+#include "brw_context.h"
+#include "brw_defines.h"
+#include "brw_state.h"
+#include "intel_batchbuffer.h"
+
+/**
+ * Chunk of L3 cache reserved for some specific purpose.
+ */
+enum brw_l3_partition {
+   /** Shared local memory. */
+   L3P_SLM = 0,
+   /** Unified return buffer. */
+   L3P_URB,
+   /** Union of DC and RO. */
+   L3P_ALL,
+   /** Data cluster RW partition. */
+   L3P_DC,
+   /** Union of IS, C and T. */
+   L3P_RO,
+   /** Instruction and state cache. */
+   L3P_IS,
+   /** Constant cache. */
+   L3P_C,
+   /** Texture cache. */
+   L3P_T,
+   /** Number of supported L3 partitions. */
+   NUM_L3P
+};
+
+/**
+ * L3 configuration represented as the number of ways allocated for each
+ * partition.  \sa get_l3_way_size().
+ */
+struct brw_l3_config {
+   unsigned n[NUM_L3P];
+};
+
+/**
+ * IVB/HSW validated L3 configurations.
+ */
+static const struct brw_l3_config ivb_l3_configs[] = {
+   /* SLM URB ALL DC  RO  IS   C   T */
+   {{  0, 32,  0,  0, 32,  0,  0,  0 }},
+   {{  0, 32,  0, 16, 16,  0,  0,  0 }},
+   {{  0, 32,  0,  4,  0,  8,  4, 16 }},
+   {{  0, 28,  0,  8,  0,  8,  4, 16 }},
+   {{  0, 28,  0, 16,  0,  8,  4,  8 }},
+   {{  0, 28,  0,  8,  0, 16,  4,  8 }},
+   {{  0, 28,  0,  0,  0, 16,  4, 16 }},
+   {{  0, 32,  0,  0,  0, 16,  0, 16 }},
+   {{  0, 28,  0,  4, 32,  0,  0,  0 }},
+   {{ 16, 16,  0, 16, 16,  0,  0,  0 }},
+   {{ 16, 16,  0,  8,  0,  8,  8,  8 }},
+   {{ 16, 16,  0,  4,  0,  8,  4, 16 }},
+   {{ 16, 16,  0,  4,  0, 16,  4,  8 }},
+   {{ 16, 16,  0,  0, 32,  0,  0,  0 }},
+   {{ 0 }}
+};
+
+/**
+ * VLV validated L3 configurations.
+ */
+static const struct brw_l3_config vlv_l3_configs[] = {
+   /* SLM URB ALL DC  RO  IS   C   T */
+   {{  0, 64,  0,  0, 32,  0,  0,  0 }},
+   {{  0, 80,  0,  0, 16,  0,  0,  0 }},
+   {{  0, 80,  0,  8,  8,  0,  0,  0 }},
+   {{  0, 64,  0, 16, 16,  0,  0,  0 }},
+   {{  0, 60,  0,  4, 32,  0,  0,  0 }},
+   {{ 32, 32,  0, 16, 16,  0,  0,  0 }},
+   {{ 32, 40,  0,  8, 16,  0,  0,  0 }},
+   {{ 32, 40,  0, 16,  8,  0,  0,  0 }},
+   {{ 0 }}
+};
+
+/**
+ * BDW validated L3 configurations.
+ */
+static const struct brw_l3_config bdw_l3_configs[] = {
+   /* SLM URB ALL DC  RO  IS   C   T */
+   {{  0, 48, 48,  0,  0,  0,  0,  0 }},
+   {{  0, 48,  0, 16, 32,  0,  0,  0 }},
+   {{  0, 32,  0, 16, 48,  0,  0,  0 }},
+   {{  0, 32,  0,  0, 64,  0,  0,  0 }},
+   {{  0, 32, 64,  0,  0,  0,  0,  0 }},
+   {{ 24, 16, 48,  0,  0,  0,  0,  0 }},
+   {{ 24, 16,  0, 16, 32,  0,  0,  0 }},
+   {{ 24, 16,  0, 32, 16,  0,  0,  0 }},
+   {{ 0 }}
+};
+
+/**
+ * CHV/SKL validated L3 configurations.
+ */
+static const struct brw_l3_config chv_l3_configs[] = {
+   /* SLM URB ALL DC  RO  IS   C   T */
+   {{  0, 48, 48,  0,  0,  0,  0,  0 }},
+   {{  0, 48,  0, 16, 32,  0,  0,  0 }},
+   {{  0, 32,  0, 16, 48,  0,  0,  0 }},
+   {{  0, 32,  0,  0, 64,  0,  0,  0 }},
+   {{  0, 32, 64,  0,  0,  0,  0,  0 }},
+   {{ 32, 16, 48,  0,  0,  0,  0,  0 }},
+   {{ 32, 16,  0, 16, 32,  0,  0,  0 }},
+   {{ 32, 16,  0, 32, 16,  0,  0,  0 }},
+   {{ 0 }}
+};
+
+/**
+ * Return a zero-terminated array of validated L3 configurations for the
+ * specified device.
+ */
+static const struct brw_l3_config *
+get_l3_configs(const struct brw_device_info *devinfo)
+{
+   switch (devinfo->gen) {
+   case 7:
+      return (devinfo->is_baytrail ? vlv_l3_configs : ivb_l3_configs);
+
+   case 8:
+      return (devinfo->is_cherryview ? chv_l3_configs : bdw_l3_configs);
+
+   case 9:
+      return chv_l3_configs;
+
+   default:
+      unreachable("Not implemented");
+   }
+}
+
+/**
+ * Return the size of an L3 way in KB.
+ */
+static unsigned
+get_l3_way_size(const struct brw_device_info *devinfo)
+{
+   if (devinfo->is_baytrail)
+      return 2;
+
+   else if (devinfo->is_cherryview || devinfo->gt == 1)
+      return 4;
+
+   else
+      return 8 * devinfo->num_slices;
+}