From: Praveen Paneri Date: Tue, 15 Nov 2016 17:19:20 +0000 (+0530) Subject: drm/i915/bxt: Broxton decoupled MMIO X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=85ee17ebeedd1af0dccd98f82ab4e644e29d84c0;p=linux-beck.git drm/i915/bxt: Broxton decoupled MMIO Decoupled MMIO is an alternative way to access forcewake domain registers, which requires less cycles for a single read/write and avoids frequent software forcewake. This certainly gives advantage over the forcewake as this new mechanism “decouples” CPU cycles and allow them to complete even when GT is in a CPD (frequency change) or C6 state. This can co-exist with forcewake and we will continue to use forcewake as appropriate. E.g. 64-bit register writes to avoid writing 2 dwords separately and land into funny situations. v2: - Moved platform check out of the function and got rid of duplicate functions to find out decoupled power domain (Chris) - Added a check for forcewake already held and skipped decoupled access (Chris) - Skipped writing 64 bit registers through decoupled MMIO (Chris) v3: - Improved commit message with more info on decoupled mmio (Tvrtko) - Changed decoupled operation to enum and used u32 instead of uint_32 data type for register offset (Tvrtko) - Moved HAS_DECOUPLED_MMIO to device info (Tvrtko) - Added lookup table for converting fw_engine to pd_engine (Tvrtko) - Improved __gen9_decoupled_read and __gen9_decoupled_write routines (Tvrtko) v4: - Fixed alignment and variable names (Chris) - Write GEN9_DECOUPLED_REG0_DW1 register in just one go (Zhe Wang) v5: - Changed HAS_DECOUPLED_MMIO() argument name to dev_priv (Tvrtko) - Sanitize info->had_decoupled_mmio at init (Chris) Signed-off-by: Zhe Wang Signed-off-by: Praveen Paneri Reviewed-by: Tvrtko Ursulin Reviewed-by: Tvrtko Ursulin Signed-off-by: Tvrtko Ursulin Link: http://patchwork.freedesktop.org/patch/msgid/1479230360-22395-1-git-send-email-praveen.paneri@intel.com --- diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h index 12f004e5d71f..21b2be8981e3 100644 --- a/drivers/gpu/drm/i915/i915_drv.h +++ b/drivers/gpu/drm/i915/i915_drv.h @@ -554,6 +554,18 @@ enum forcewake_domains { #define FW_REG_READ (1) #define FW_REG_WRITE (2) +enum decoupled_power_domain { + GEN9_DECOUPLED_PD_BLITTER = 0, + GEN9_DECOUPLED_PD_RENDER, + GEN9_DECOUPLED_PD_MEDIA, + GEN9_DECOUPLED_PD_ALL +}; + +enum decoupled_ops { + GEN9_DECOUPLED_OP_WRITE = 0, + GEN9_DECOUPLED_OP_READ +}; + enum forcewake_domains intel_uncore_forcewake_for_reg(struct drm_i915_private *dev_priv, i915_reg_t reg, unsigned int op); @@ -688,7 +700,8 @@ struct intel_csr { func(cursor_needs_physical); \ func(hws_needs_physical); \ func(overlay_needs_physical); \ - func(supports_tv) + func(supports_tv); \ + func(has_decoupled_mmio) struct sseu_dev_info { u8 slice_mask; @@ -2650,6 +2663,8 @@ struct drm_i915_cmd_table { #define GT_FREQUENCY_MULTIPLIER 50 #define GEN9_FREQ_SCALER 3 +#define HAS_DECOUPLED_MMIO(dev_priv) (INTEL_INFO(dev_priv)->has_decoupled_mmio) + #include "i915_trace.h" static inline bool intel_scanout_needs_vtd_wa(struct drm_i915_private *dev_priv) diff --git a/drivers/gpu/drm/i915/i915_pci.c b/drivers/gpu/drm/i915/i915_pci.c index 70a99ceaf43d..fce8e198bc76 100644 --- a/drivers/gpu/drm/i915/i915_pci.c +++ b/drivers/gpu/drm/i915/i915_pci.c @@ -363,6 +363,7 @@ static const struct intel_device_info intel_broxton_info = { .has_hw_contexts = 1, .has_logical_ring_contexts = 1, .has_guc = 1, + .has_decoupled_mmio = 1, .ddb_size = 512, GEN_DEFAULT_PIPEOFFSETS, IVB_CURSOR_OFFSETS, diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h index 3361d7ffc63e..c70c07a7b586 100644 --- a/drivers/gpu/drm/i915/i915_reg.h +++ b/drivers/gpu/drm/i915/i915_reg.h @@ -7342,6 +7342,13 @@ enum { #define SKL_FUSE_PG1_DIST_STATUS (1<<26) #define SKL_FUSE_PG2_DIST_STATUS (1<<25) +/* Decoupled MMIO register pair for kernel driver */ +#define GEN9_DECOUPLED_REG0_DW0 _MMIO(0xF00) +#define GEN9_DECOUPLED_REG0_DW1 _MMIO(0xF04) +#define GEN9_DECOUPLED_DW1_GO (1<<31) +#define GEN9_DECOUPLED_PD_SHIFT 28 +#define GEN9_DECOUPLED_OP_SHIFT 24 + /* Per-pipe DDI Function Control */ #define _TRANS_DDI_FUNC_CTL_A 0x60400 #define _TRANS_DDI_FUNC_CTL_B 0x61400 diff --git a/drivers/gpu/drm/i915/intel_uncore.c b/drivers/gpu/drm/i915/intel_uncore.c index e2b188dcf908..e953303bff54 100644 --- a/drivers/gpu/drm/i915/intel_uncore.c +++ b/drivers/gpu/drm/i915/intel_uncore.c @@ -402,6 +402,8 @@ check_for_unclaimed_mmio(struct drm_i915_private *dev_priv) static void __intel_uncore_early_sanitize(struct drm_i915_private *dev_priv, bool restore_forcewake) { + struct intel_device_info *info = mkwrite_device_info(dev_priv); + /* clear out unclaimed reg detection bit */ if (check_for_unclaimed_mmio(dev_priv)) DRM_DEBUG("unclaimed mmio detected on uncore init, clearing\n"); @@ -419,6 +421,10 @@ static void __intel_uncore_early_sanitize(struct drm_i915_private *dev_priv, GT_FIFO_CTL_RC6_POLICY_STALL); } + /* Enable Decoupled MMIO only on BXT C stepping onwards */ + if (!IS_BXT_REVID(dev_priv, BXT_REVID_C0, REVID_FOREVER)) + info->has_decoupled_mmio = false; + intel_uncore_forcewake_reset(dev_priv, restore_forcewake); } @@ -831,6 +837,66 @@ unclaimed_reg_debug(struct drm_i915_private *dev_priv, __unclaimed_reg_debug(dev_priv, reg, read, before); } +static const enum decoupled_power_domain fw2dpd_domain[] = { + GEN9_DECOUPLED_PD_RENDER, + GEN9_DECOUPLED_PD_BLITTER, + GEN9_DECOUPLED_PD_ALL, + GEN9_DECOUPLED_PD_MEDIA, + GEN9_DECOUPLED_PD_ALL, + GEN9_DECOUPLED_PD_ALL, + GEN9_DECOUPLED_PD_ALL +}; + +/* + * Decoupled MMIO access for only 1 DWORD + */ +static void __gen9_decoupled_mmio_access(struct drm_i915_private *dev_priv, + u32 reg, + enum forcewake_domains fw_domain, + enum decoupled_ops operation) +{ + enum decoupled_power_domain dp_domain; + u32 ctrl_reg_data = 0; + + dp_domain = fw2dpd_domain[fw_domain - 1]; + + ctrl_reg_data |= reg; + ctrl_reg_data |= (operation << GEN9_DECOUPLED_OP_SHIFT); + ctrl_reg_data |= (dp_domain << GEN9_DECOUPLED_PD_SHIFT); + ctrl_reg_data |= GEN9_DECOUPLED_DW1_GO; + __raw_i915_write32(dev_priv, GEN9_DECOUPLED_REG0_DW1, ctrl_reg_data); + + if (wait_for_atomic((__raw_i915_read32(dev_priv, + GEN9_DECOUPLED_REG0_DW1) & + GEN9_DECOUPLED_DW1_GO) == 0, + FORCEWAKE_ACK_TIMEOUT_MS)) + DRM_ERROR("Decoupled MMIO wait timed out\n"); +} + +static inline u32 +__gen9_decoupled_mmio_read32(struct drm_i915_private *dev_priv, + u32 reg, + enum forcewake_domains fw_domain) +{ + __gen9_decoupled_mmio_access(dev_priv, reg, fw_domain, + GEN9_DECOUPLED_OP_READ); + + return __raw_i915_read32(dev_priv, GEN9_DECOUPLED_REG0_DW0); +} + +static inline void +__gen9_decoupled_mmio_write(struct drm_i915_private *dev_priv, + u32 reg, u32 data, + enum forcewake_domains fw_domain) +{ + + __raw_i915_write32(dev_priv, GEN9_DECOUPLED_REG0_DW0, data); + + __gen9_decoupled_mmio_access(dev_priv, reg, fw_domain, + GEN9_DECOUPLED_OP_WRITE); +} + + #define GEN2_READ_HEADER(x) \ u##x val = 0; \ assert_rpm_wakelock_held(dev_priv); @@ -935,6 +1001,28 @@ fwtable_read##x(struct drm_i915_private *dev_priv, i915_reg_t reg, bool trace) { GEN6_READ_FOOTER; \ } +#define __gen9_decoupled_read(x) \ +static u##x \ +gen9_decoupled_read##x(struct drm_i915_private *dev_priv, \ + i915_reg_t reg, bool trace) { \ + enum forcewake_domains fw_engine; \ + GEN6_READ_HEADER(x); \ + fw_engine = __fwtable_reg_read_fw_domains(offset); \ + if (fw_engine & ~dev_priv->uncore.fw_domains_active) { \ + unsigned i; \ + u32 *ptr_data = (u32 *) &val; \ + for (i = 0; i < x/32; i++, offset += sizeof(u32), ptr_data++) \ + *ptr_data = __gen9_decoupled_mmio_read32(dev_priv, \ + offset, \ + fw_engine); \ + } else { \ + val = __raw_i915_read##x(dev_priv, reg); \ + } \ + GEN6_READ_FOOTER; \ +} + +__gen9_decoupled_read(32) +__gen9_decoupled_read(64) __fwtable_read(8) __fwtable_read(16) __fwtable_read(32) @@ -1064,6 +1152,25 @@ fwtable_write##x(struct drm_i915_private *dev_priv, i915_reg_t reg, u##x val, bo GEN6_WRITE_FOOTER; \ } +#define __gen9_decoupled_write(x) \ +static void \ +gen9_decoupled_write##x(struct drm_i915_private *dev_priv, \ + i915_reg_t reg, u##x val, \ + bool trace) { \ + enum forcewake_domains fw_engine; \ + GEN6_WRITE_HEADER; \ + fw_engine = __fwtable_reg_write_fw_domains(offset); \ + if (fw_engine & ~dev_priv->uncore.fw_domains_active) \ + __gen9_decoupled_mmio_write(dev_priv, \ + offset, \ + val, \ + fw_engine); \ + else \ + __raw_i915_write##x(dev_priv, reg, val); \ + GEN6_WRITE_FOOTER; \ +} + +__gen9_decoupled_write(32) __fwtable_write(8) __fwtable_write(16) __fwtable_write(32) @@ -1287,6 +1394,14 @@ void intel_uncore_init(struct drm_i915_private *dev_priv) ASSIGN_FW_DOMAINS_TABLE(__gen9_fw_ranges); ASSIGN_WRITE_MMIO_VFUNCS(fwtable); ASSIGN_READ_MMIO_VFUNCS(fwtable); + if (HAS_DECOUPLED_MMIO(dev_priv)) { + dev_priv->uncore.funcs.mmio_readl = + gen9_decoupled_read32; + dev_priv->uncore.funcs.mmio_readq = + gen9_decoupled_read64; + dev_priv->uncore.funcs.mmio_writel = + gen9_decoupled_write32; + } break; case 8: if (IS_CHERRYVIEW(dev_priv)) {