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drm/i915/bxt: Determine BXT slice/subslice/EU info 

Modify the Gen9 SSEU info initialization logic to support
Broxton. Broxton reuses the SKL fuse registers but has at most
1 slice and 6 EU per subslice.

Signed-off-by: Jeff McGee <jeff.mcgee@intel.com>
Reviewed-by: Imre Deak <imre.deak@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Jeff McGee 2015-04-03 18:13:16 -07:00 committed by Daniel Vetter
parent 9705ad8a96
commit dead16e2c3
2 changed files with 31 additions and 20 deletions
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47
drivers/gpu/drm/i915/i915_dma.c
View File

@ -611,9 +611,21 @@ static void gen9_sseu_info_init(struct drm_device *dev)
{
struct drm_i915_private *dev_priv = dev->dev_private;
struct intel_device_info *info;
const int s_max = 3, ss_max = 4, eu_max = 8;
int s_max = 3, ss_max = 4, eu_max = 8;
int s, ss;
u32 fuse2, eu_disable[s_max], s_enable, ss_disable;
u32 fuse2, s_enable, ss_disable, eu_disable;
u8 eu_mask = 0xff;
/*
* BXT has a single slice. BXT also has at most 6 EU per subslice,
* and therefore only the lowest 6 bits of the 8-bit EU disable
* fields are valid.
*/
if (IS_BROXTON(dev)) {
s_max = 1;
eu_max = 6;
eu_mask = 0x3f;
}
info = (struct intel_device_info *)&dev_priv->info;
fuse2 = I915_READ(GEN8_FUSE2);
@ -622,10 +634,6 @@ static void gen9_sseu_info_init(struct drm_device *dev)
ss_disable = (fuse2 & GEN9_F2_SS_DIS_MASK) >>
GEN9_F2_SS_DIS_SHIFT;
eu_disable[0] = I915_READ(GEN8_EU_DISABLE0);
eu_disable[1] = I915_READ(GEN8_EU_DISABLE1);
eu_disable[2] = I915_READ(GEN8_EU_DISABLE2);
info->slice_total = hweight32(s_enable);
/*
* The subslice disable field is global, i.e. it applies
@ -644,25 +652,26 @@ static void gen9_sseu_info_init(struct drm_device *dev)
/* skip disabled slice */
continue;
eu_disable = I915_READ(GEN9_EU_DISABLE(s));
for (ss = 0; ss < ss_max; ss++) {
u32 n_disabled;
int eu_per_ss;
if (ss_disable & (0x1 << ss))
/* skip disabled subslice */
continue;
n_disabled = hweight8(eu_disable[s] >>
(ss * eu_max));
eu_per_ss = eu_max - hweight8((eu_disable >> (ss*8)) &
eu_mask);
/*
* Record which subslice(s) has(have) 7 EUs. we
* can tune the hash used to spread work among
* subslices if they are unbalanced.
*/
if (eu_max - n_disabled == 7)
if (eu_per_ss == 7)
info->subslice_7eu[s] |= 1 << ss;
info->eu_total += eu_max - n_disabled;
info->eu_total += eu_per_ss;
}
}
@ -670,7 +679,8 @@ static void gen9_sseu_info_init(struct drm_device *dev)
* SKL is expected to always have a uniform distribution
* of EU across subslices with the exception that any one
* EU in any one subslice may be fused off for die
* recovery.
* recovery. BXT is expected to be perfectly uniform in EU
* distribution.
*/
info->eu_per_subslice = info->subslice_total ?
DIV_ROUND_UP(info->eu_total,
@ -678,11 +688,14 @@ static void gen9_sseu_info_init(struct drm_device *dev)
/*
* SKL supports slice power gating on devices with more than
* one slice, and supports EU power gating on devices with
* more than one EU pair per subslice.
* more than one EU pair per subslice. BXT supports subslice
* power gating on devices with more than one subslice, and
* supports EU power gating on devices with more than one EU
* pair per subslice.
*/
info->has_slice_pg = (info->slice_total > 1) ? 1 : 0;
info->has_subslice_pg = 0;
info->has_eu_pg = (info->eu_per_subslice > 2) ? 1 : 0;
info->has_slice_pg = (IS_SKYLAKE(dev) && (info->slice_total > 1));
info->has_subslice_pg = (IS_BROXTON(dev) && (info->subslice_total > 1));
info->has_eu_pg = (info->eu_per_subslice > 2);
}
/*
@ -747,7 +760,7 @@ static void intel_device_info_runtime_init(struct drm_device *dev)
/* Initialize slice/subslice/EU info */
if (IS_CHERRYVIEW(dev))
cherryview_sseu_info_init(dev);
else if (IS_SKYLAKE(dev))
else if (INTEL_INFO(dev)->gen >= 9)
gen9_sseu_info_init(dev);
DRM_DEBUG_DRIVER("slice total: %u\n", info->slice_total);

4
drivers/gpu/drm/i915/i915_reg.h
View File

@ -1554,9 +1554,7 @@ enum skl_disp_power_wells {
#define GEN9_F2_SS_DIS_SHIFT 20
#define GEN9_F2_SS_DIS_MASK (0xf << GEN9_F2_SS_DIS_SHIFT)
#define GEN8_EU_DISABLE0 0x9134
#define GEN8_EU_DISABLE1 0x9138
#define GEN8_EU_DISABLE2 0x913c
#define GEN9_EU_DISABLE(slice) (0x9134 + (slice)*0x4)
#define GEN6_BSD_SLEEP_PSMI_CONTROL 0x12050
#define GEN6_BSD_SLEEP_MSG_DISABLE (1 << 0)