On 22/10/18 10:13, Tomasz Lis wrote:
For Icelake and above, MOCS table for each platform is published
within bspec. The table is versioned, and new entries are assigned
a version number. Existing entries do not change and their version
is constant.
This introduces a parameter which allows getting max version number
of the MOCS entries currently supported, ie. value of 2 would mean
only version 1 and version 2 entries are initialized and can be used
by the user mode clients.
BSpec: 34007
Signed-off-by: Tomasz Lis <[email protected]>
Cc: Joonas Lahtinen <[email protected]>
Cc: Chris Wilson <[email protected]>
Cc: Mika Kuoppala <[email protected]>
Cc: Daniele Ceraolo Spurio <[email protected]>
Cc: Zhenyu Wang <[email protected]>
Cc: Zhi A Wang <[email protected]>
Cc: Anuj Phogat <[email protected]>
---
drivers/gpu/drm/i915/i915_drv.c | 6 ++++++
drivers/gpu/drm/i915/intel_mocs.c | 12 ++++++++++++
drivers/gpu/drm/i915/intel_mocs.h | 1 +
include/uapi/drm/i915_drm.h | 11 +++++++++++
4 files changed, 30 insertions(+)
diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c
index baac35f..92fa8fd 100644
--- a/drivers/gpu/drm/i915/i915_drv.c
+++ b/drivers/gpu/drm/i915/i915_drv.c
@@ -53,6 +53,7 @@
#include "i915_vgpu.h"
#include "intel_drv.h"
#include "intel_uc.h"
+#include "intel_mocs.h"
static struct drm_driver driver;
@@ -444,6 +445,11 @@ static int i915_getparam_ioctl(struct drm_device *dev, void *data,
case I915_PARAM_MMAP_GTT_COHERENT:
value = INTEL_INFO(dev_priv)->has_coherent_ggtt;
break;
+ case I915_PARAM_MOCS_TABLE_VERSION:
+ value = intel_mocs_table_version(dev_priv);
+ if (!value)
+ return -ENODEV;
Do we really want to return -ENODEV for platforms that do have a MOCS
table programmed, but the table is not one versioned in the specs (i.e.
Gen9-10)? I think returning "0" for those to indicate "kernel-defined
table" would be ok and we could limit -ENODEV for platforms that don't
have a table at all. But what wins is what the callers of the ioctl
would like to get from the kernel ;)
+ break;
default:
DRM_DEBUG("Unknown parameter %d\n", param->param);
return -EINVAL;
diff --git a/drivers/gpu/drm/i915/intel_mocs.c
b/drivers/gpu/drm/i915/intel_mocs.c
index dc34e83..fc1e98b 100644
--- a/drivers/gpu/drm/i915/intel_mocs.c
+++ b/drivers/gpu/drm/i915/intel_mocs.c
@@ -469,6 +469,18 @@ static i915_reg_t mocs_register(enum intel_engine_id
engine_id, int index)
}
/**
+ * intel_mocs_table_version() - get version of mocs table implementation
+ * @i915: i915 device struct.
+ */
+int intel_mocs_table_version(struct drm_i915_private *i915)
+{
+ if (IS_ICELAKE(i915))
+ return 1;
Can we add this version value as a define above the table, to keep them
close to each other?
If we agree on my suggestion above to differentiate between no table at
all (< 0), kernel-defined table (= 0) and spec-defined versioned table
(> 0), it might also be useful to store the version with the table info
in drm_i915_mocs_table and then have intel_mocs_table_version call
get_mocs_settings(), e.g:
int intel_mocs_table_version(struct drm_i915_private *i915)
{
struct drm_i915_mocs_table table;
if (!get_mocs_settings(i915, &table))
return -ENODEV;
return table->version;
}
Thanks,
Daniele
+ else
+ return 0;
+}
+
+/**
* intel_mocs_init_engine() - emit the mocs control table
* @engine: The engine for whom to emit the registers.
*
diff --git a/drivers/gpu/drm/i915/intel_mocs.h
b/drivers/gpu/drm/i915/intel_mocs.h
index d89080d..dc1d64a 100644
--- a/drivers/gpu/drm/i915/intel_mocs.h
+++ b/drivers/gpu/drm/i915/intel_mocs.h
@@ -55,5 +55,6 @@
int intel_rcs_context_init_mocs(struct i915_request *rq);
void intel_mocs_init_l3cc_table(struct drm_i915_private *dev_priv);
void intel_mocs_init_engine(struct intel_engine_cs *engine);
+int intel_mocs_table_version(struct drm_i915_private *i915);
#endif
diff --git a/include/uapi/drm/i915_drm.h b/include/uapi/drm/i915_drm.h
index 298b2e1..16aafc4 100644
--- a/include/uapi/drm/i915_drm.h
+++ b/include/uapi/drm/i915_drm.h
@@ -559,6 +559,17 @@ typedef struct drm_i915_irq_wait {
*/
#define I915_PARAM_MMAP_GTT_COHERENT 52
+/*
+ * Query MOCS table version used during hardware initialization.
+ *
+ * The MOCS table for each platform is published as part of bspec. Entries in
+ * the table are supposed to never be modified, but new enties are added,
making
+ * more indexes in the table valid. This parameter informs which version
+ * of the table was used to initialize the currently used graphics hardware,
+ * and therefore which MOCS indexes are useable.
+ */
+#define I915_PARAM_MOCS_TABLE_VERSION 53
+
typedef struct drm_i915_getparam {
__s32 param;
/*
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