From d7f25f23d2e0c7898c95b2a6fd84f6358588de48 Mon Sep 17 00:00:00 2001 From: Damien Lespiau Date: Thu, 8 May 2014 22:19:40 +0300 Subject: [PATCH] drm/i915/chv: Implement stolen memory size detection MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit CHV uses the same bits as SNB/VLV to code the Graphics Mode Select field (GFX stolen memory size) with the addition of finer granularity modes: 4MB increments from 0x11 (8MB) to 0x1d. Values strictly above 0x1d are either reserved or not supported. v2: 4MB increments, not 8MB. 32MB has been omitted from the list of new values (Ville Syrjälä) v3: Also correctly interpret GGMS (GTT Graphics Memory Size) (Ville Syrjälä) v4: Don't assign a value that needs 20bits or more to a u16 (Rafael Barbalho) [vsyrjala: v5: Split the early quirks to another patch] Reviewed-by: Jani Nikula Reviewed-by: Ville Syrjälä Reviewed-by: Rafael Barbalho Tested-by: Rafael Barbalho Signed-off-by: Damien Lespiau Signed-off-by: Ville Syrjälä Signed-off-by: Daniel Vetter --- drivers/gpu/drm/i915/i915_gem_gtt.c | 38 +++++++++++++++++++++++++++-- 1 file changed, 36 insertions(+), 2 deletions(-) diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.c b/drivers/gpu/drm/i915/i915_gem_gtt.c index 84dcb4e00d4c..ca213c59bf27 100644 --- a/drivers/gpu/drm/i915/i915_gem_gtt.c +++ b/drivers/gpu/drm/i915/i915_gem_gtt.c @@ -1766,6 +1766,17 @@ static inline unsigned int gen8_get_total_gtt_size(u16 bdw_gmch_ctl) return bdw_gmch_ctl << 20; } +static inline unsigned int chv_get_total_gtt_size(u16 gmch_ctrl) +{ + gmch_ctrl >>= SNB_GMCH_GGMS_SHIFT; + gmch_ctrl &= SNB_GMCH_GGMS_MASK; + + if (gmch_ctrl) + return 1 << (20 + gmch_ctrl); + + return 0; +} + static inline size_t gen6_get_stolen_size(u16 snb_gmch_ctl) { snb_gmch_ctl >>= SNB_GMCH_GMS_SHIFT; @@ -1780,6 +1791,24 @@ static inline size_t gen8_get_stolen_size(u16 bdw_gmch_ctl) return bdw_gmch_ctl << 25; /* 32 MB units */ } +static size_t chv_get_stolen_size(u16 gmch_ctrl) +{ + gmch_ctrl >>= SNB_GMCH_GMS_SHIFT; + gmch_ctrl &= SNB_GMCH_GMS_MASK; + + /* + * 0x0 to 0x10: 32MB increments starting at 0MB + * 0x11 to 0x16: 4MB increments starting at 8MB + * 0x17 to 0x1d: 4MB increments start at 36MB + */ + if (gmch_ctrl < 0x11) + return gmch_ctrl << 25; + else if (gmch_ctrl < 0x17) + return (gmch_ctrl - 0x11 + 2) << 22; + else + return (gmch_ctrl - 0x17 + 9) << 22; +} + static int ggtt_probe_common(struct drm_device *dev, size_t gtt_size) { @@ -1876,9 +1905,14 @@ static int gen8_gmch_probe(struct drm_device *dev, pci_read_config_word(dev->pdev, SNB_GMCH_CTRL, &snb_gmch_ctl); - *stolen = gen8_get_stolen_size(snb_gmch_ctl); + if (IS_CHERRYVIEW(dev)) { + *stolen = chv_get_stolen_size(snb_gmch_ctl); + gtt_size = chv_get_total_gtt_size(snb_gmch_ctl); + } else { + *stolen = gen8_get_stolen_size(snb_gmch_ctl); + gtt_size = gen8_get_total_gtt_size(snb_gmch_ctl); + } - gtt_size = gen8_get_total_gtt_size(snb_gmch_ctl); *gtt_total = (gtt_size / sizeof(gen8_gtt_pte_t)) << PAGE_SHIFT; if (IS_CHERRYVIEW(dev)) -- 2.34.1