From 5771caf885ae779ade0ea009ae5d5f363bb72a52 Mon Sep 17 00:00:00 2001 From: Mahesh Kumar Date: Fri, 24 Aug 2018 15:02:22 +0530 Subject: [PATCH] drm/i915/skl+: Decode memory bandwidth and parameters This patch adds support to decode system memory bandwidth and other parameters for skylake and Gen9+ platforms, which will be used for arbitrated display memory bandwidth calculation in GEN9 based platforms and WM latency level-0 Work-around calculation on GEN9+. Changes Since V1: - s/memdev_info/dram_info - create a struct to hold channel info Changes Since V2: - rewrite code to adhere i915 coding style - not valid for GLK Signed-off-by: Mahesh Kumar Reviewed-by: Maarten Lankhorst Signed-off-by: Rodrigo Vivi Link: https://patchwork.freedesktop.org/patch/msgid/20180824093225.12598-3-mahesh1.kumar@intel.com --- drivers/gpu/drm/i915/i915_drv.c | 145 ++++++++++++++++++++++++++++++++++++++-- drivers/gpu/drm/i915/i915_drv.h | 8 +++ drivers/gpu/drm/i915/i915_reg.h | 18 +++++ 3 files changed, 167 insertions(+), 4 deletions(-) diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c index 52befc1..361dfcd 100644 --- a/drivers/gpu/drm/i915/i915_drv.c +++ b/drivers/gpu/drm/i915/i915_drv.c @@ -1063,6 +1063,132 @@ static void intel_sanitize_options(struct drm_i915_private *dev_priv) intel_gvt_sanitize_options(dev_priv); } +static enum dram_rank skl_get_dimm_rank(u8 size, u32 rank) +{ + if (size == 0) + return I915_DRAM_RANK_INVALID; + if (rank == SKL_DRAM_RANK_SINGLE) + return I915_DRAM_RANK_SINGLE; + else if (rank == SKL_DRAM_RANK_DUAL) + return I915_DRAM_RANK_DUAL; + + return I915_DRAM_RANK_INVALID; +} + +static int +skl_dram_get_channel_info(struct dram_channel_info *ch, u32 val) +{ + u32 tmp_l, tmp_s; + u32 s_val = val >> SKL_DRAM_S_SHIFT; + + if (!val) + return -EINVAL; + + tmp_l = val & SKL_DRAM_SIZE_MASK; + tmp_s = s_val & SKL_DRAM_SIZE_MASK; + + if (tmp_l == 0 && tmp_s == 0) + return -EINVAL; + + ch->l_info.size = tmp_l; + ch->s_info.size = tmp_s; + + tmp_l = (val & SKL_DRAM_WIDTH_MASK) >> SKL_DRAM_WIDTH_SHIFT; + tmp_s = (s_val & SKL_DRAM_WIDTH_MASK) >> SKL_DRAM_WIDTH_SHIFT; + ch->l_info.width = (1 << tmp_l) * 8; + ch->s_info.width = (1 << tmp_s) * 8; + + tmp_l = val & SKL_DRAM_RANK_MASK; + tmp_s = s_val & SKL_DRAM_RANK_MASK; + ch->l_info.rank = skl_get_dimm_rank(ch->l_info.size, tmp_l); + ch->s_info.rank = skl_get_dimm_rank(ch->s_info.size, tmp_s); + + if (ch->l_info.rank == I915_DRAM_RANK_DUAL || + ch->s_info.rank == I915_DRAM_RANK_DUAL) + ch->rank = I915_DRAM_RANK_DUAL; + else if (ch->l_info.rank == I915_DRAM_RANK_SINGLE && + ch->s_info.rank == I915_DRAM_RANK_SINGLE) + ch->rank = I915_DRAM_RANK_DUAL; + else + ch->rank = I915_DRAM_RANK_SINGLE; + + DRM_DEBUG_KMS("(size:width:rank) L(%dGB:X%d:%s) S(%dGB:X%d:%s)\n", + ch->l_info.size, ch->l_info.width, + ch->l_info.rank ? "dual" : "single", + ch->s_info.size, ch->s_info.width, + ch->s_info.rank ? "dual" : "single"); + + return 0; +} + +static int +skl_dram_get_channels_info(struct drm_i915_private *dev_priv) +{ + struct dram_info *dram_info = &dev_priv->dram_info; + struct dram_channel_info ch0, ch1; + u32 val; + int ret; + + val = I915_READ(SKL_MAD_DIMM_CH0_0_0_0_MCHBAR_MCMAIN); + ret = skl_dram_get_channel_info(&ch0, val); + if (ret == 0) + dram_info->num_channels++; + + val = I915_READ(SKL_MAD_DIMM_CH1_0_0_0_MCHBAR_MCMAIN); + ret = skl_dram_get_channel_info(&ch1, val); + if (ret == 0) + dram_info->num_channels++; + + if (dram_info->num_channels == 0) { + DRM_INFO("Number of memory channels is zero\n"); + return -EINVAL; + } + + /* + * If any of the channel is single rank channel, worst case output + * will be same as if single rank memory, so consider single rank + * memory. + */ + if (ch0.rank == I915_DRAM_RANK_SINGLE || + ch1.rank == I915_DRAM_RANK_SINGLE) + dram_info->rank = I915_DRAM_RANK_SINGLE; + else + dram_info->rank = max(ch0.rank, ch1.rank); + + if (dram_info->rank == I915_DRAM_RANK_INVALID) { + DRM_INFO("couldn't get memory rank information\n"); + return -EINVAL; + } + return 0; +} + +static int +skl_get_dram_info(struct drm_i915_private *dev_priv) +{ + struct dram_info *dram_info = &dev_priv->dram_info; + u32 mem_freq_khz, val; + int ret; + + ret = skl_dram_get_channels_info(dev_priv); + if (ret) + return ret; + + val = I915_READ(SKL_MC_BIOS_DATA_0_0_0_MCHBAR_PCU); + mem_freq_khz = DIV_ROUND_UP((val & SKL_REQ_DATA_MASK) * + SKL_MEMORY_FREQ_MULTIPLIER_HZ, 1000); + + dram_info->bandwidth_kbps = dram_info->num_channels * + mem_freq_khz * 8; + + if (dram_info->bandwidth_kbps == 0) { + DRM_INFO("Couldn't get system memory bandwidth\n"); + return -EINVAL; + } + + dram_info->valid = true; + return 0; +} + static int bxt_get_dram_info(struct drm_i915_private *dev_priv) { @@ -1153,6 +1279,7 @@ static void intel_get_dram_info(struct drm_i915_private *dev_priv) { struct dram_info *dram_info = &dev_priv->dram_info; + char bandwidth_str[32]; int ret; dram_info->valid = false; @@ -1160,15 +1287,25 @@ intel_get_dram_info(struct drm_i915_private *dev_priv) dram_info->bandwidth_kbps = 0; dram_info->num_channels = 0; - if (!IS_BROXTON(dev_priv)) + if (INTEL_GEN(dev_priv) < 9 || IS_GEMINILAKE(dev_priv)) return; - ret = bxt_get_dram_info(dev_priv); + /* Need to calculate bandwidth only for Gen9 */ + if (IS_BROXTON(dev_priv)) + ret = bxt_get_dram_info(dev_priv); + else if (INTEL_GEN(dev_priv) == 9) + ret = skl_get_dram_info(dev_priv); + else + ret = skl_dram_get_channels_info(dev_priv); if (ret) return; - DRM_DEBUG_KMS("DRAM bandwidth:%d KBps, total-channels: %u\n", - dram_info->bandwidth_kbps, dram_info->num_channels); + if (dram_info->bandwidth_kbps) + sprintf(bandwidth_str, "%d KBps", dram_info->bandwidth_kbps); + else + sprintf(bandwidth_str, "unknown"); + DRM_DEBUG_KMS("DRAM bandwidth:%s, total-channels: %u\n", + bandwidth_str, dram_info->num_channels); DRM_DEBUG_KMS("DRAM rank: %s rank\n", (dram_info->rank == I915_DRAM_RANK_DUAL) ? "dual" : "single"); diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h index bf88006f..e7eb04b 100644 --- a/drivers/gpu/drm/i915/i915_drv.h +++ b/drivers/gpu/drm/i915/i915_drv.h @@ -2169,6 +2169,14 @@ struct drm_i915_private { */ }; +struct dram_channel_info { + struct info { + u8 size, width; + enum dram_rank rank; + } l_info, s_info; + enum dram_rank rank; +}; + static inline struct drm_i915_private *to_i915(const struct drm_device *dev) { return container_of(dev, struct drm_i915_private, drm); diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h index a2bf669..4948b35 100644 --- a/drivers/gpu/drm/i915/i915_reg.h +++ b/drivers/gpu/drm/i915/i915_reg.h @@ -9613,6 +9613,24 @@ enum skl_power_gate { #define BXT_DRAM_SIZE_12GB (0x3 << 6) #define BXT_DRAM_SIZE_16GB (0x4 << 6) +#define SKL_MEMORY_FREQ_MULTIPLIER_HZ 266666666 +#define SKL_MC_BIOS_DATA_0_0_0_MCHBAR_PCU _MMIO(MCHBAR_MIRROR_BASE_SNB + 0x5E04) +#define SKL_REQ_DATA_MASK (0xF << 0) + +#define SKL_MAD_DIMM_CH0_0_0_0_MCHBAR_MCMAIN _MMIO(MCHBAR_MIRROR_BASE_SNB + 0x500C) +#define SKL_MAD_DIMM_CH1_0_0_0_MCHBAR_MCMAIN _MMIO(MCHBAR_MIRROR_BASE_SNB + 0x5010) +#define SKL_DRAM_S_SHIFT 16 +#define SKL_DRAM_SIZE_MASK 0x3F +#define SKL_DRAM_WIDTH_MASK (0x3 << 8) +#define SKL_DRAM_WIDTH_SHIFT 8 +#define SKL_DRAM_WIDTH_X8 (0x0 << 8) +#define SKL_DRAM_WIDTH_X16 (0x1 << 8) +#define SKL_DRAM_WIDTH_X32 (0x2 << 8) +#define SKL_DRAM_RANK_MASK (0x1 << 10) +#define SKL_DRAM_RANK_SHIFT 10 +#define SKL_DRAM_RANK_SINGLE (0x0 << 10) +#define SKL_DRAM_RANK_DUAL (0x1 << 10) + /* Please see hsw_read_dcomp() and hsw_write_dcomp() before using this register, * since on HSW we can't write to it using I915_WRITE. */ #define D_COMP_HSW _MMIO(MCHBAR_MIRROR_BASE_SNB + 0x5F0C) -- 2.7.4