Eric Anholt | 673a394 | 2008-07-30 12:06:12 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright © 2008 Intel Corporation |
| 3 | * |
| 4 | * Permission is hereby granted, free of charge, to any person obtaining a |
| 5 | * copy of this software and associated documentation files (the "Software"), |
| 6 | * to deal in the Software without restriction, including without limitation |
| 7 | * the rights to use, copy, modify, merge, publish, distribute, sublicense, |
| 8 | * and/or sell copies of the Software, and to permit persons to whom the |
| 9 | * Software is furnished to do so, subject to the following conditions: |
| 10 | * |
| 11 | * The above copyright notice and this permission notice (including the next |
| 12 | * paragraph) shall be included in all copies or substantial portions of the |
| 13 | * Software. |
| 14 | * |
| 15 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| 16 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| 17 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
| 18 | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
| 19 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING |
| 20 | * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS |
| 21 | * IN THE SOFTWARE. |
| 22 | * |
| 23 | * Authors: |
| 24 | * Eric Anholt <eric@anholt.net> |
| 25 | * |
| 26 | */ |
| 27 | |
Jesse Barnes | d765898 | 2009-06-05 14:41:29 +0000 | [diff] [blame] | 28 | #include <linux/acpi.h> |
| 29 | #include <linux/pnp.h> |
Eric Anholt | 280b713 | 2009-03-12 16:56:27 -0700 | [diff] [blame] | 30 | #include "linux/string.h" |
| 31 | #include "linux/bitops.h" |
Eric Anholt | 673a394 | 2008-07-30 12:06:12 -0700 | [diff] [blame] | 32 | #include "drmP.h" |
| 33 | #include "drm.h" |
| 34 | #include "i915_drm.h" |
| 35 | #include "i915_drv.h" |
| 36 | |
| 37 | /** @file i915_gem_tiling.c |
| 38 | * |
| 39 | * Support for managing tiling state of buffer objects. |
| 40 | * |
| 41 | * The idea behind tiling is to increase cache hit rates by rearranging |
| 42 | * pixel data so that a group of pixel accesses are in the same cacheline. |
| 43 | * Performance improvement from doing this on the back/depth buffer are on |
| 44 | * the order of 30%. |
| 45 | * |
| 46 | * Intel architectures make this somewhat more complicated, though, by |
| 47 | * adjustments made to addressing of data when the memory is in interleaved |
| 48 | * mode (matched pairs of DIMMS) to improve memory bandwidth. |
| 49 | * For interleaved memory, the CPU sends every sequential 64 bytes |
| 50 | * to an alternate memory channel so it can get the bandwidth from both. |
| 51 | * |
| 52 | * The GPU also rearranges its accesses for increased bandwidth to interleaved |
| 53 | * memory, and it matches what the CPU does for non-tiled. However, when tiled |
| 54 | * it does it a little differently, since one walks addresses not just in the |
| 55 | * X direction but also Y. So, along with alternating channels when bit |
| 56 | * 6 of the address flips, it also alternates when other bits flip -- Bits 9 |
| 57 | * (every 512 bytes, an X tile scanline) and 10 (every two X tile scanlines) |
| 58 | * are common to both the 915 and 965-class hardware. |
| 59 | * |
| 60 | * The CPU also sometimes XORs in higher bits as well, to improve |
| 61 | * bandwidth doing strided access like we do so frequently in graphics. This |
| 62 | * is called "Channel XOR Randomization" in the MCH documentation. The result |
| 63 | * is that the CPU is XORing in either bit 11 or bit 17 to bit 6 of its address |
| 64 | * decode. |
| 65 | * |
| 66 | * All of this bit 6 XORing has an effect on our memory management, |
| 67 | * as we need to make sure that the 3d driver can correctly address object |
| 68 | * contents. |
| 69 | * |
| 70 | * If we don't have interleaved memory, all tiling is safe and no swizzling is |
| 71 | * required. |
| 72 | * |
| 73 | * When bit 17 is XORed in, we simply refuse to tile at all. Bit |
| 74 | * 17 is not just a page offset, so as we page an objet out and back in, |
| 75 | * individual pages in it will have different bit 17 addresses, resulting in |
| 76 | * each 64 bytes being swapped with its neighbor! |
| 77 | * |
| 78 | * Otherwise, if interleaved, we have to tell the 3d driver what the address |
| 79 | * swizzling it needs to do is, since it's writing with the CPU to the pages |
| 80 | * (bit 6 and potentially bit 11 XORed in), and the GPU is reading from the |
| 81 | * pages (bit 6, 9, and 10 XORed in), resulting in a cumulative bit swizzling |
| 82 | * required by the CPU of XORing in bit 6, 9, 10, and potentially 11, in order |
| 83 | * to match what the GPU expects. |
| 84 | */ |
| 85 | |
Jesse Barnes | d765898 | 2009-06-05 14:41:29 +0000 | [diff] [blame] | 86 | #define MCHBAR_I915 0x44 |
| 87 | #define MCHBAR_I965 0x48 |
| 88 | #define MCHBAR_SIZE (4*4096) |
| 89 | |
| 90 | #define DEVEN_REG 0x54 |
| 91 | #define DEVEN_MCHBAR_EN (1 << 28) |
| 92 | |
| 93 | /* Allocate space for the MCH regs if needed, return nonzero on error */ |
| 94 | static int |
| 95 | intel_alloc_mchbar_resource(struct drm_device *dev) |
| 96 | { |
Jesse Barnes | d765898 | 2009-06-05 14:41:29 +0000 | [diff] [blame] | 97 | drm_i915_private_t *dev_priv = dev->dev_private; |
| 98 | int reg = IS_I965G(dev) ? MCHBAR_I965 : MCHBAR_I915; |
| 99 | u32 temp_lo, temp_hi = 0; |
| 100 | u64 mchbar_addr; |
| 101 | int ret = 0; |
| 102 | |
Jesse Barnes | d765898 | 2009-06-05 14:41:29 +0000 | [diff] [blame] | 103 | if (IS_I965G(dev)) |
Dave Airlie | ec2a4c3 | 2009-08-04 11:43:41 +1000 | [diff] [blame] | 104 | pci_read_config_dword(dev_priv->bridge_dev, reg + 4, &temp_hi); |
| 105 | pci_read_config_dword(dev_priv->bridge_dev, reg, &temp_lo); |
Jesse Barnes | d765898 | 2009-06-05 14:41:29 +0000 | [diff] [blame] | 106 | mchbar_addr = ((u64)temp_hi << 32) | temp_lo; |
| 107 | |
| 108 | /* If ACPI doesn't have it, assume we need to allocate it ourselves */ |
Keith Packard | b99e228 | 2009-06-10 19:08:16 -0700 | [diff] [blame] | 109 | #ifdef CONFIG_PNP |
Jesse Barnes | d765898 | 2009-06-05 14:41:29 +0000 | [diff] [blame] | 110 | if (mchbar_addr && |
| 111 | pnp_range_reserved(mchbar_addr, mchbar_addr + MCHBAR_SIZE)) { |
| 112 | ret = 0; |
Dave Airlie | ec2a4c3 | 2009-08-04 11:43:41 +1000 | [diff] [blame] | 113 | goto out; |
Jesse Barnes | d765898 | 2009-06-05 14:41:29 +0000 | [diff] [blame] | 114 | } |
Keith Packard | b99e228 | 2009-06-10 19:08:16 -0700 | [diff] [blame] | 115 | #endif |
Jesse Barnes | d765898 | 2009-06-05 14:41:29 +0000 | [diff] [blame] | 116 | |
| 117 | /* Get some space for it */ |
Dave Airlie | ec2a4c3 | 2009-08-04 11:43:41 +1000 | [diff] [blame] | 118 | ret = pci_bus_alloc_resource(dev_priv->bridge_dev->bus, &dev_priv->mch_res, |
Jesse Barnes | d765898 | 2009-06-05 14:41:29 +0000 | [diff] [blame] | 119 | MCHBAR_SIZE, MCHBAR_SIZE, |
| 120 | PCIBIOS_MIN_MEM, |
| 121 | 0, pcibios_align_resource, |
Dave Airlie | ec2a4c3 | 2009-08-04 11:43:41 +1000 | [diff] [blame] | 122 | dev_priv->bridge_dev); |
Jesse Barnes | d765898 | 2009-06-05 14:41:29 +0000 | [diff] [blame] | 123 | if (ret) { |
Zhao Yakui | 44d98a6 | 2009-10-09 11:39:40 +0800 | [diff] [blame] | 124 | DRM_DEBUG_DRIVER("failed bus alloc: %d\n", ret); |
Jesse Barnes | d765898 | 2009-06-05 14:41:29 +0000 | [diff] [blame] | 125 | dev_priv->mch_res.start = 0; |
Dave Airlie | ec2a4c3 | 2009-08-04 11:43:41 +1000 | [diff] [blame] | 126 | goto out; |
Jesse Barnes | d765898 | 2009-06-05 14:41:29 +0000 | [diff] [blame] | 127 | } |
| 128 | |
| 129 | if (IS_I965G(dev)) |
Dave Airlie | ec2a4c3 | 2009-08-04 11:43:41 +1000 | [diff] [blame] | 130 | pci_write_config_dword(dev_priv->bridge_dev, reg + 4, |
Jesse Barnes | d765898 | 2009-06-05 14:41:29 +0000 | [diff] [blame] | 131 | upper_32_bits(dev_priv->mch_res.start)); |
| 132 | |
Dave Airlie | ec2a4c3 | 2009-08-04 11:43:41 +1000 | [diff] [blame] | 133 | pci_write_config_dword(dev_priv->bridge_dev, reg, |
Jesse Barnes | d765898 | 2009-06-05 14:41:29 +0000 | [diff] [blame] | 134 | lower_32_bits(dev_priv->mch_res.start)); |
Jesse Barnes | d765898 | 2009-06-05 14:41:29 +0000 | [diff] [blame] | 135 | out: |
| 136 | return ret; |
| 137 | } |
| 138 | |
| 139 | /* Setup MCHBAR if possible, return true if we should disable it again */ |
| 140 | static bool |
| 141 | intel_setup_mchbar(struct drm_device *dev) |
| 142 | { |
Dave Airlie | ec2a4c3 | 2009-08-04 11:43:41 +1000 | [diff] [blame] | 143 | drm_i915_private_t *dev_priv = dev->dev_private; |
Jesse Barnes | d765898 | 2009-06-05 14:41:29 +0000 | [diff] [blame] | 144 | int mchbar_reg = IS_I965G(dev) ? MCHBAR_I965 : MCHBAR_I915; |
| 145 | u32 temp; |
| 146 | bool need_disable = false, enabled; |
| 147 | |
Jesse Barnes | d765898 | 2009-06-05 14:41:29 +0000 | [diff] [blame] | 148 | if (IS_I915G(dev) || IS_I915GM(dev)) { |
Dave Airlie | ec2a4c3 | 2009-08-04 11:43:41 +1000 | [diff] [blame] | 149 | pci_read_config_dword(dev_priv->bridge_dev, DEVEN_REG, &temp); |
Jesse Barnes | d765898 | 2009-06-05 14:41:29 +0000 | [diff] [blame] | 150 | enabled = !!(temp & DEVEN_MCHBAR_EN); |
| 151 | } else { |
Dave Airlie | ec2a4c3 | 2009-08-04 11:43:41 +1000 | [diff] [blame] | 152 | pci_read_config_dword(dev_priv->bridge_dev, mchbar_reg, &temp); |
Jesse Barnes | d765898 | 2009-06-05 14:41:29 +0000 | [diff] [blame] | 153 | enabled = temp & 1; |
| 154 | } |
| 155 | |
| 156 | /* If it's already enabled, don't have to do anything */ |
| 157 | if (enabled) |
Dave Airlie | ec2a4c3 | 2009-08-04 11:43:41 +1000 | [diff] [blame] | 158 | goto out; |
Jesse Barnes | d765898 | 2009-06-05 14:41:29 +0000 | [diff] [blame] | 159 | |
| 160 | if (intel_alloc_mchbar_resource(dev)) |
Dave Airlie | ec2a4c3 | 2009-08-04 11:43:41 +1000 | [diff] [blame] | 161 | goto out; |
Jesse Barnes | d765898 | 2009-06-05 14:41:29 +0000 | [diff] [blame] | 162 | |
| 163 | need_disable = true; |
| 164 | |
| 165 | /* Space is allocated or reserved, so enable it. */ |
| 166 | if (IS_I915G(dev) || IS_I915GM(dev)) { |
Dave Airlie | ec2a4c3 | 2009-08-04 11:43:41 +1000 | [diff] [blame] | 167 | pci_write_config_dword(dev_priv->bridge_dev, DEVEN_REG, |
Jesse Barnes | d765898 | 2009-06-05 14:41:29 +0000 | [diff] [blame] | 168 | temp | DEVEN_MCHBAR_EN); |
| 169 | } else { |
Dave Airlie | ec2a4c3 | 2009-08-04 11:43:41 +1000 | [diff] [blame] | 170 | pci_read_config_dword(dev_priv->bridge_dev, mchbar_reg, &temp); |
| 171 | pci_write_config_dword(dev_priv->bridge_dev, mchbar_reg, temp | 1); |
Jesse Barnes | d765898 | 2009-06-05 14:41:29 +0000 | [diff] [blame] | 172 | } |
Jesse Barnes | d765898 | 2009-06-05 14:41:29 +0000 | [diff] [blame] | 173 | out: |
| 174 | return need_disable; |
| 175 | } |
| 176 | |
| 177 | static void |
| 178 | intel_teardown_mchbar(struct drm_device *dev, bool disable) |
| 179 | { |
| 180 | drm_i915_private_t *dev_priv = dev->dev_private; |
Jesse Barnes | d765898 | 2009-06-05 14:41:29 +0000 | [diff] [blame] | 181 | int mchbar_reg = IS_I965G(dev) ? MCHBAR_I965 : MCHBAR_I915; |
| 182 | u32 temp; |
| 183 | |
Jesse Barnes | d765898 | 2009-06-05 14:41:29 +0000 | [diff] [blame] | 184 | if (disable) { |
| 185 | if (IS_I915G(dev) || IS_I915GM(dev)) { |
Dave Airlie | ec2a4c3 | 2009-08-04 11:43:41 +1000 | [diff] [blame] | 186 | pci_read_config_dword(dev_priv->bridge_dev, DEVEN_REG, &temp); |
Jesse Barnes | d765898 | 2009-06-05 14:41:29 +0000 | [diff] [blame] | 187 | temp &= ~DEVEN_MCHBAR_EN; |
Dave Airlie | ec2a4c3 | 2009-08-04 11:43:41 +1000 | [diff] [blame] | 188 | pci_write_config_dword(dev_priv->bridge_dev, DEVEN_REG, temp); |
Jesse Barnes | d765898 | 2009-06-05 14:41:29 +0000 | [diff] [blame] | 189 | } else { |
Dave Airlie | ec2a4c3 | 2009-08-04 11:43:41 +1000 | [diff] [blame] | 190 | pci_read_config_dword(dev_priv->bridge_dev, mchbar_reg, &temp); |
Jesse Barnes | d765898 | 2009-06-05 14:41:29 +0000 | [diff] [blame] | 191 | temp &= ~1; |
Dave Airlie | ec2a4c3 | 2009-08-04 11:43:41 +1000 | [diff] [blame] | 192 | pci_write_config_dword(dev_priv->bridge_dev, mchbar_reg, temp); |
Jesse Barnes | d765898 | 2009-06-05 14:41:29 +0000 | [diff] [blame] | 193 | } |
| 194 | } |
| 195 | |
| 196 | if (dev_priv->mch_res.start) |
| 197 | release_resource(&dev_priv->mch_res); |
| 198 | } |
| 199 | |
Eric Anholt | 673a394 | 2008-07-30 12:06:12 -0700 | [diff] [blame] | 200 | /** |
| 201 | * Detects bit 6 swizzling of address lookup between IGD access and CPU |
| 202 | * access through main memory. |
| 203 | */ |
| 204 | void |
| 205 | i915_gem_detect_bit_6_swizzle(struct drm_device *dev) |
| 206 | { |
| 207 | drm_i915_private_t *dev_priv = dev->dev_private; |
| 208 | uint32_t swizzle_x = I915_BIT_6_SWIZZLE_UNKNOWN; |
| 209 | uint32_t swizzle_y = I915_BIT_6_SWIZZLE_UNKNOWN; |
Jesse Barnes | d765898 | 2009-06-05 14:41:29 +0000 | [diff] [blame] | 210 | bool need_disable; |
Eric Anholt | 673a394 | 2008-07-30 12:06:12 -0700 | [diff] [blame] | 211 | |
Adam Jackson | f2b115e | 2009-12-03 17:14:42 -0500 | [diff] [blame^] | 212 | if (IS_IRONLAKE(dev)) { |
| 213 | /* On Ironlake whatever DRAM config, GPU always do |
Zhenyu Wang | 553bd14 | 2009-09-02 10:57:52 +0800 | [diff] [blame] | 214 | * same swizzling setup. |
| 215 | */ |
| 216 | swizzle_x = I915_BIT_6_SWIZZLE_9_10; |
| 217 | swizzle_y = I915_BIT_6_SWIZZLE_9; |
| 218 | } else if (!IS_I9XX(dev)) { |
Eric Anholt | 673a394 | 2008-07-30 12:06:12 -0700 | [diff] [blame] | 219 | /* As far as we know, the 865 doesn't have these bit 6 |
| 220 | * swizzling issues. |
| 221 | */ |
| 222 | swizzle_x = I915_BIT_6_SWIZZLE_NONE; |
| 223 | swizzle_y = I915_BIT_6_SWIZZLE_NONE; |
Eric Anholt | 568d9a8 | 2009-03-12 16:27:11 -0700 | [diff] [blame] | 224 | } else if (IS_MOBILE(dev)) { |
Eric Anholt | 673a394 | 2008-07-30 12:06:12 -0700 | [diff] [blame] | 225 | uint32_t dcc; |
| 226 | |
Jesse Barnes | d765898 | 2009-06-05 14:41:29 +0000 | [diff] [blame] | 227 | /* Try to make sure MCHBAR is enabled before poking at it */ |
| 228 | need_disable = intel_setup_mchbar(dev); |
| 229 | |
Eric Anholt | 568d9a8 | 2009-03-12 16:27:11 -0700 | [diff] [blame] | 230 | /* On mobile 9xx chipsets, channel interleave by the CPU is |
| 231 | * determined by DCC. For single-channel, neither the CPU |
| 232 | * nor the GPU do swizzling. For dual channel interleaved, |
| 233 | * the GPU's interleave is bit 9 and 10 for X tiled, and bit |
| 234 | * 9 for Y tiled. The CPU's interleave is independent, and |
| 235 | * can be based on either bit 11 (haven't seen this yet) or |
| 236 | * bit 17 (common). |
Eric Anholt | 673a394 | 2008-07-30 12:06:12 -0700 | [diff] [blame] | 237 | */ |
| 238 | dcc = I915_READ(DCC); |
| 239 | switch (dcc & DCC_ADDRESSING_MODE_MASK) { |
| 240 | case DCC_ADDRESSING_MODE_SINGLE_CHANNEL: |
| 241 | case DCC_ADDRESSING_MODE_DUAL_CHANNEL_ASYMMETRIC: |
| 242 | swizzle_x = I915_BIT_6_SWIZZLE_NONE; |
| 243 | swizzle_y = I915_BIT_6_SWIZZLE_NONE; |
| 244 | break; |
| 245 | case DCC_ADDRESSING_MODE_DUAL_CHANNEL_INTERLEAVED: |
Eric Anholt | 568d9a8 | 2009-03-12 16:27:11 -0700 | [diff] [blame] | 246 | if (dcc & DCC_CHANNEL_XOR_DISABLE) { |
| 247 | /* This is the base swizzling by the GPU for |
| 248 | * tiled buffers. |
| 249 | */ |
Eric Anholt | 673a394 | 2008-07-30 12:06:12 -0700 | [diff] [blame] | 250 | swizzle_x = I915_BIT_6_SWIZZLE_9_10; |
| 251 | swizzle_y = I915_BIT_6_SWIZZLE_9; |
Eric Anholt | 568d9a8 | 2009-03-12 16:27:11 -0700 | [diff] [blame] | 252 | } else if ((dcc & DCC_CHANNEL_XOR_BIT_17) == 0) { |
| 253 | /* Bit 11 swizzling by the CPU in addition. */ |
Eric Anholt | 673a394 | 2008-07-30 12:06:12 -0700 | [diff] [blame] | 254 | swizzle_x = I915_BIT_6_SWIZZLE_9_10_11; |
| 255 | swizzle_y = I915_BIT_6_SWIZZLE_9_11; |
| 256 | } else { |
Eric Anholt | 568d9a8 | 2009-03-12 16:27:11 -0700 | [diff] [blame] | 257 | /* Bit 17 swizzling by the CPU in addition. */ |
Eric Anholt | 280b713 | 2009-03-12 16:56:27 -0700 | [diff] [blame] | 258 | swizzle_x = I915_BIT_6_SWIZZLE_9_10_17; |
| 259 | swizzle_y = I915_BIT_6_SWIZZLE_9_17; |
Eric Anholt | 673a394 | 2008-07-30 12:06:12 -0700 | [diff] [blame] | 260 | } |
| 261 | break; |
| 262 | } |
| 263 | if (dcc == 0xffffffff) { |
| 264 | DRM_ERROR("Couldn't read from MCHBAR. " |
| 265 | "Disabling tiling.\n"); |
| 266 | swizzle_x = I915_BIT_6_SWIZZLE_UNKNOWN; |
| 267 | swizzle_y = I915_BIT_6_SWIZZLE_UNKNOWN; |
| 268 | } |
Jesse Barnes | d765898 | 2009-06-05 14:41:29 +0000 | [diff] [blame] | 269 | |
| 270 | intel_teardown_mchbar(dev, need_disable); |
Eric Anholt | 673a394 | 2008-07-30 12:06:12 -0700 | [diff] [blame] | 271 | } else { |
| 272 | /* The 965, G33, and newer, have a very flexible memory |
| 273 | * configuration. It will enable dual-channel mode |
| 274 | * (interleaving) on as much memory as it can, and the GPU |
| 275 | * will additionally sometimes enable different bit 6 |
| 276 | * swizzling for tiled objects from the CPU. |
| 277 | * |
| 278 | * Here's what I found on the G965: |
| 279 | * slot fill memory size swizzling |
| 280 | * 0A 0B 1A 1B 1-ch 2-ch |
| 281 | * 512 0 0 0 512 0 O |
| 282 | * 512 0 512 0 16 1008 X |
| 283 | * 512 0 0 512 16 1008 X |
| 284 | * 0 512 0 512 16 1008 X |
| 285 | * 1024 1024 1024 0 2048 1024 O |
| 286 | * |
| 287 | * We could probably detect this based on either the DRB |
| 288 | * matching, which was the case for the swizzling required in |
| 289 | * the table above, or from the 1-ch value being less than |
| 290 | * the minimum size of a rank. |
| 291 | */ |
| 292 | if (I915_READ16(C0DRB3) != I915_READ16(C1DRB3)) { |
| 293 | swizzle_x = I915_BIT_6_SWIZZLE_NONE; |
| 294 | swizzle_y = I915_BIT_6_SWIZZLE_NONE; |
| 295 | } else { |
| 296 | swizzle_x = I915_BIT_6_SWIZZLE_9_10; |
| 297 | swizzle_y = I915_BIT_6_SWIZZLE_9; |
| 298 | } |
| 299 | } |
| 300 | |
| 301 | dev_priv->mm.bit_6_swizzle_x = swizzle_x; |
| 302 | dev_priv->mm.bit_6_swizzle_y = swizzle_y; |
| 303 | } |
| 304 | |
Jesse Barnes | 0f973f2 | 2009-01-26 17:10:45 -0800 | [diff] [blame] | 305 | |
| 306 | /** |
| 307 | * Returns the size of the fence for a tiled object of the given size. |
| 308 | */ |
| 309 | static int |
| 310 | i915_get_fence_size(struct drm_device *dev, int size) |
| 311 | { |
| 312 | int i; |
| 313 | int start; |
| 314 | |
| 315 | if (IS_I965G(dev)) { |
| 316 | /* The 965 can have fences at any page boundary. */ |
| 317 | return ALIGN(size, 4096); |
| 318 | } else { |
| 319 | /* Align the size to a power of two greater than the smallest |
| 320 | * fence size. |
| 321 | */ |
| 322 | if (IS_I9XX(dev)) |
| 323 | start = 1024 * 1024; |
| 324 | else |
| 325 | start = 512 * 1024; |
| 326 | |
| 327 | for (i = start; i < size; i <<= 1) |
| 328 | ; |
| 329 | |
| 330 | return i; |
| 331 | } |
| 332 | } |
| 333 | |
| 334 | /* Check pitch constriants for all chips & tiling formats */ |
| 335 | static bool |
| 336 | i915_tiling_ok(struct drm_device *dev, int stride, int size, int tiling_mode) |
| 337 | { |
| 338 | int tile_width; |
| 339 | |
| 340 | /* Linear is always fine */ |
| 341 | if (tiling_mode == I915_TILING_NONE) |
| 342 | return true; |
| 343 | |
Eric Anholt | e76a16d | 2009-05-26 17:44:56 -0700 | [diff] [blame] | 344 | if (!IS_I9XX(dev) || |
| 345 | (tiling_mode == I915_TILING_Y && HAS_128_BYTE_Y_TILING(dev))) |
Jesse Barnes | 0f973f2 | 2009-01-26 17:10:45 -0800 | [diff] [blame] | 346 | tile_width = 128; |
| 347 | else |
| 348 | tile_width = 512; |
| 349 | |
Daniel Vetter | 8d7773a | 2009-03-29 14:09:41 +0200 | [diff] [blame] | 350 | /* check maximum stride & object size */ |
| 351 | if (IS_I965G(dev)) { |
| 352 | /* i965 stores the end address of the gtt mapping in the fence |
| 353 | * reg, so dont bother to check the size */ |
| 354 | if (stride / 128 > I965_FENCE_MAX_PITCH_VAL) |
| 355 | return false; |
| 356 | } else if (IS_I9XX(dev)) { |
Eric Anholt | e76a16d | 2009-05-26 17:44:56 -0700 | [diff] [blame] | 357 | uint32_t pitch_val = ffs(stride / tile_width) - 1; |
| 358 | |
| 359 | /* XXX: For Y tiling, FENCE_MAX_PITCH_VAL is actually 6 (8KB) |
| 360 | * instead of 4 (2KB) on 945s. |
| 361 | */ |
| 362 | if (pitch_val > I915_FENCE_MAX_PITCH_VAL || |
Daniel Vetter | 8d7773a | 2009-03-29 14:09:41 +0200 | [diff] [blame] | 363 | size > (I830_FENCE_MAX_SIZE_VAL << 20)) |
| 364 | return false; |
| 365 | } else { |
Eric Anholt | e76a16d | 2009-05-26 17:44:56 -0700 | [diff] [blame] | 366 | uint32_t pitch_val = ffs(stride / tile_width) - 1; |
| 367 | |
| 368 | if (pitch_val > I830_FENCE_MAX_PITCH_VAL || |
Daniel Vetter | 8d7773a | 2009-03-29 14:09:41 +0200 | [diff] [blame] | 369 | size > (I830_FENCE_MAX_SIZE_VAL << 19)) |
| 370 | return false; |
| 371 | } |
| 372 | |
Jesse Barnes | 0f973f2 | 2009-01-26 17:10:45 -0800 | [diff] [blame] | 373 | /* 965+ just needs multiples of tile width */ |
| 374 | if (IS_I965G(dev)) { |
| 375 | if (stride & (tile_width - 1)) |
| 376 | return false; |
| 377 | return true; |
| 378 | } |
| 379 | |
| 380 | /* Pre-965 needs power of two tile widths */ |
| 381 | if (stride < tile_width) |
| 382 | return false; |
| 383 | |
| 384 | if (stride & (stride - 1)) |
| 385 | return false; |
| 386 | |
Chris Wilson | 52dc7d3 | 2009-06-06 09:46:01 +0100 | [diff] [blame] | 387 | /* We don't 0handle the aperture area covered by the fence being bigger |
Jesse Barnes | 0f973f2 | 2009-01-26 17:10:45 -0800 | [diff] [blame] | 388 | * than the object size. |
| 389 | */ |
| 390 | if (i915_get_fence_size(dev, size) != size) |
| 391 | return false; |
| 392 | |
| 393 | return true; |
| 394 | } |
| 395 | |
Chris Wilson | 52dc7d3 | 2009-06-06 09:46:01 +0100 | [diff] [blame] | 396 | static bool |
| 397 | i915_gem_object_fence_offset_ok(struct drm_gem_object *obj, int tiling_mode) |
| 398 | { |
| 399 | struct drm_device *dev = obj->dev; |
| 400 | struct drm_i915_gem_object *obj_priv = obj->driver_private; |
| 401 | |
| 402 | if (obj_priv->gtt_space == NULL) |
| 403 | return true; |
| 404 | |
| 405 | if (tiling_mode == I915_TILING_NONE) |
| 406 | return true; |
| 407 | |
| 408 | if (!IS_I965G(dev)) { |
| 409 | if (obj_priv->gtt_offset & (obj->size - 1)) |
| 410 | return false; |
| 411 | if (IS_I9XX(dev)) { |
| 412 | if (obj_priv->gtt_offset & ~I915_FENCE_START_MASK) |
| 413 | return false; |
| 414 | } else { |
| 415 | if (obj_priv->gtt_offset & ~I830_FENCE_START_MASK) |
| 416 | return false; |
| 417 | } |
| 418 | } |
| 419 | |
| 420 | return true; |
| 421 | } |
| 422 | |
Eric Anholt | 673a394 | 2008-07-30 12:06:12 -0700 | [diff] [blame] | 423 | /** |
| 424 | * Sets the tiling mode of an object, returning the required swizzling of |
| 425 | * bit 6 of addresses in the object. |
| 426 | */ |
| 427 | int |
| 428 | i915_gem_set_tiling(struct drm_device *dev, void *data, |
| 429 | struct drm_file *file_priv) |
| 430 | { |
| 431 | struct drm_i915_gem_set_tiling *args = data; |
| 432 | drm_i915_private_t *dev_priv = dev->dev_private; |
| 433 | struct drm_gem_object *obj; |
| 434 | struct drm_i915_gem_object *obj_priv; |
Chris Wilson | 52dc7d3 | 2009-06-06 09:46:01 +0100 | [diff] [blame] | 435 | int ret = 0; |
Eric Anholt | 673a394 | 2008-07-30 12:06:12 -0700 | [diff] [blame] | 436 | |
| 437 | obj = drm_gem_object_lookup(dev, file_priv, args->handle); |
| 438 | if (obj == NULL) |
| 439 | return -EINVAL; |
| 440 | obj_priv = obj->driver_private; |
| 441 | |
Chris Wilson | 72daad4 | 2009-01-30 21:10:22 +0000 | [diff] [blame] | 442 | if (!i915_tiling_ok(dev, args->stride, obj->size, args->tiling_mode)) { |
Chris Wilson | 52dc7d3 | 2009-06-06 09:46:01 +0100 | [diff] [blame] | 443 | mutex_lock(&dev->struct_mutex); |
Chris Wilson | 72daad4 | 2009-01-30 21:10:22 +0000 | [diff] [blame] | 444 | drm_gem_object_unreference(obj); |
Chris Wilson | 52dc7d3 | 2009-06-06 09:46:01 +0100 | [diff] [blame] | 445 | mutex_unlock(&dev->struct_mutex); |
Jesse Barnes | 0f973f2 | 2009-01-26 17:10:45 -0800 | [diff] [blame] | 446 | return -EINVAL; |
Chris Wilson | 72daad4 | 2009-01-30 21:10:22 +0000 | [diff] [blame] | 447 | } |
Jesse Barnes | 0f973f2 | 2009-01-26 17:10:45 -0800 | [diff] [blame] | 448 | |
Eric Anholt | 673a394 | 2008-07-30 12:06:12 -0700 | [diff] [blame] | 449 | if (args->tiling_mode == I915_TILING_NONE) { |
Eric Anholt | 673a394 | 2008-07-30 12:06:12 -0700 | [diff] [blame] | 450 | args->swizzle_mode = I915_BIT_6_SWIZZLE_NONE; |
Chris Wilson | 52dc7d3 | 2009-06-06 09:46:01 +0100 | [diff] [blame] | 451 | args->stride = 0; |
Eric Anholt | 673a394 | 2008-07-30 12:06:12 -0700 | [diff] [blame] | 452 | } else { |
| 453 | if (args->tiling_mode == I915_TILING_X) |
| 454 | args->swizzle_mode = dev_priv->mm.bit_6_swizzle_x; |
| 455 | else |
| 456 | args->swizzle_mode = dev_priv->mm.bit_6_swizzle_y; |
Eric Anholt | 280b713 | 2009-03-12 16:56:27 -0700 | [diff] [blame] | 457 | |
| 458 | /* Hide bit 17 swizzling from the user. This prevents old Mesa |
| 459 | * from aborting the application on sw fallbacks to bit 17, |
| 460 | * and we use the pread/pwrite bit17 paths to swizzle for it. |
| 461 | * If there was a user that was relying on the swizzle |
| 462 | * information for drm_intel_bo_map()ed reads/writes this would |
| 463 | * break it, but we don't have any of those. |
| 464 | */ |
| 465 | if (args->swizzle_mode == I915_BIT_6_SWIZZLE_9_17) |
| 466 | args->swizzle_mode = I915_BIT_6_SWIZZLE_9; |
| 467 | if (args->swizzle_mode == I915_BIT_6_SWIZZLE_9_10_17) |
| 468 | args->swizzle_mode = I915_BIT_6_SWIZZLE_9_10; |
| 469 | |
Eric Anholt | 673a394 | 2008-07-30 12:06:12 -0700 | [diff] [blame] | 470 | /* If we can't handle the swizzling, make it untiled. */ |
| 471 | if (args->swizzle_mode == I915_BIT_6_SWIZZLE_UNKNOWN) { |
| 472 | args->tiling_mode = I915_TILING_NONE; |
| 473 | args->swizzle_mode = I915_BIT_6_SWIZZLE_NONE; |
Chris Wilson | 52dc7d3 | 2009-06-06 09:46:01 +0100 | [diff] [blame] | 474 | args->stride = 0; |
Eric Anholt | 673a394 | 2008-07-30 12:06:12 -0700 | [diff] [blame] | 475 | } |
| 476 | } |
Jesse Barnes | 0f973f2 | 2009-01-26 17:10:45 -0800 | [diff] [blame] | 477 | |
Chris Wilson | 52dc7d3 | 2009-06-06 09:46:01 +0100 | [diff] [blame] | 478 | mutex_lock(&dev->struct_mutex); |
| 479 | if (args->tiling_mode != obj_priv->tiling_mode || |
| 480 | args->stride != obj_priv->stride) { |
| 481 | /* We need to rebind the object if its current allocation |
| 482 | * no longer meets the alignment restrictions for its new |
| 483 | * tiling mode. Otherwise we can just leave it alone, but |
| 484 | * need to ensure that any fence register is cleared. |
Jesse Barnes | 0f973f2 | 2009-01-26 17:10:45 -0800 | [diff] [blame] | 485 | */ |
Chris Wilson | 52dc7d3 | 2009-06-06 09:46:01 +0100 | [diff] [blame] | 486 | if (!i915_gem_object_fence_offset_ok(obj, args->tiling_mode)) |
| 487 | ret = i915_gem_object_unbind(obj); |
| 488 | else |
| 489 | ret = i915_gem_object_put_fence_reg(obj); |
Jesse Barnes | 0f973f2 | 2009-01-26 17:10:45 -0800 | [diff] [blame] | 490 | if (ret != 0) { |
| 491 | WARN(ret != -ERESTARTSYS, |
Chris Wilson | 52dc7d3 | 2009-06-06 09:46:01 +0100 | [diff] [blame] | 492 | "failed to reset object for tiling switch"); |
Jesse Barnes | 0f973f2 | 2009-01-26 17:10:45 -0800 | [diff] [blame] | 493 | args->tiling_mode = obj_priv->tiling_mode; |
Chris Wilson | 52dc7d3 | 2009-06-06 09:46:01 +0100 | [diff] [blame] | 494 | args->stride = obj_priv->stride; |
| 495 | goto err; |
Jesse Barnes | 0f973f2 | 2009-01-26 17:10:45 -0800 | [diff] [blame] | 496 | } |
Eric Anholt | 673a394 | 2008-07-30 12:06:12 -0700 | [diff] [blame] | 497 | |
Eric Anholt | d05ca30 | 2009-07-10 13:02:26 -0700 | [diff] [blame] | 498 | /* If we've changed tiling, GTT-mappings of the object |
| 499 | * need to re-fault to ensure that the correct fence register |
| 500 | * setup is in place. |
| 501 | */ |
| 502 | i915_gem_release_mmap(obj); |
| 503 | |
Chris Wilson | 52dc7d3 | 2009-06-06 09:46:01 +0100 | [diff] [blame] | 504 | obj_priv->tiling_mode = args->tiling_mode; |
| 505 | obj_priv->stride = args->stride; |
| 506 | } |
| 507 | err: |
Eric Anholt | 673a394 | 2008-07-30 12:06:12 -0700 | [diff] [blame] | 508 | drm_gem_object_unreference(obj); |
Chris Wilson | d687310 | 2009-02-08 19:07:51 +0000 | [diff] [blame] | 509 | mutex_unlock(&dev->struct_mutex); |
Eric Anholt | 673a394 | 2008-07-30 12:06:12 -0700 | [diff] [blame] | 510 | |
Chris Wilson | 52dc7d3 | 2009-06-06 09:46:01 +0100 | [diff] [blame] | 511 | return ret; |
Eric Anholt | 673a394 | 2008-07-30 12:06:12 -0700 | [diff] [blame] | 512 | } |
| 513 | |
| 514 | /** |
| 515 | * Returns the current tiling mode and required bit 6 swizzling for the object. |
| 516 | */ |
| 517 | int |
| 518 | i915_gem_get_tiling(struct drm_device *dev, void *data, |
| 519 | struct drm_file *file_priv) |
| 520 | { |
| 521 | struct drm_i915_gem_get_tiling *args = data; |
| 522 | drm_i915_private_t *dev_priv = dev->dev_private; |
| 523 | struct drm_gem_object *obj; |
| 524 | struct drm_i915_gem_object *obj_priv; |
| 525 | |
| 526 | obj = drm_gem_object_lookup(dev, file_priv, args->handle); |
| 527 | if (obj == NULL) |
| 528 | return -EINVAL; |
| 529 | obj_priv = obj->driver_private; |
| 530 | |
| 531 | mutex_lock(&dev->struct_mutex); |
| 532 | |
| 533 | args->tiling_mode = obj_priv->tiling_mode; |
| 534 | switch (obj_priv->tiling_mode) { |
| 535 | case I915_TILING_X: |
| 536 | args->swizzle_mode = dev_priv->mm.bit_6_swizzle_x; |
| 537 | break; |
| 538 | case I915_TILING_Y: |
| 539 | args->swizzle_mode = dev_priv->mm.bit_6_swizzle_y; |
| 540 | break; |
| 541 | case I915_TILING_NONE: |
| 542 | args->swizzle_mode = I915_BIT_6_SWIZZLE_NONE; |
| 543 | break; |
| 544 | default: |
| 545 | DRM_ERROR("unknown tiling mode\n"); |
| 546 | } |
| 547 | |
Eric Anholt | 280b713 | 2009-03-12 16:56:27 -0700 | [diff] [blame] | 548 | /* Hide bit 17 from the user -- see comment in i915_gem_set_tiling */ |
| 549 | if (args->swizzle_mode == I915_BIT_6_SWIZZLE_9_17) |
| 550 | args->swizzle_mode = I915_BIT_6_SWIZZLE_9; |
| 551 | if (args->swizzle_mode == I915_BIT_6_SWIZZLE_9_10_17) |
| 552 | args->swizzle_mode = I915_BIT_6_SWIZZLE_9_10; |
| 553 | |
Eric Anholt | 673a394 | 2008-07-30 12:06:12 -0700 | [diff] [blame] | 554 | drm_gem_object_unreference(obj); |
Chris Wilson | d687310 | 2009-02-08 19:07:51 +0000 | [diff] [blame] | 555 | mutex_unlock(&dev->struct_mutex); |
Eric Anholt | 673a394 | 2008-07-30 12:06:12 -0700 | [diff] [blame] | 556 | |
| 557 | return 0; |
| 558 | } |
Eric Anholt | 280b713 | 2009-03-12 16:56:27 -0700 | [diff] [blame] | 559 | |
| 560 | /** |
| 561 | * Swap every 64 bytes of this page around, to account for it having a new |
| 562 | * bit 17 of its physical address and therefore being interpreted differently |
| 563 | * by the GPU. |
| 564 | */ |
| 565 | static int |
| 566 | i915_gem_swizzle_page(struct page *page) |
| 567 | { |
| 568 | char *vaddr; |
| 569 | int i; |
| 570 | char temp[64]; |
| 571 | |
| 572 | vaddr = kmap(page); |
| 573 | if (vaddr == NULL) |
| 574 | return -ENOMEM; |
| 575 | |
| 576 | for (i = 0; i < PAGE_SIZE; i += 128) { |
| 577 | memcpy(temp, &vaddr[i], 64); |
| 578 | memcpy(&vaddr[i], &vaddr[i + 64], 64); |
| 579 | memcpy(&vaddr[i + 64], temp, 64); |
| 580 | } |
| 581 | |
| 582 | kunmap(page); |
| 583 | |
| 584 | return 0; |
| 585 | } |
| 586 | |
| 587 | void |
| 588 | i915_gem_object_do_bit_17_swizzle(struct drm_gem_object *obj) |
| 589 | { |
| 590 | struct drm_device *dev = obj->dev; |
| 591 | drm_i915_private_t *dev_priv = dev->dev_private; |
| 592 | struct drm_i915_gem_object *obj_priv = obj->driver_private; |
| 593 | int page_count = obj->size >> PAGE_SHIFT; |
| 594 | int i; |
| 595 | |
| 596 | if (dev_priv->mm.bit_6_swizzle_x != I915_BIT_6_SWIZZLE_9_10_17) |
| 597 | return; |
| 598 | |
| 599 | if (obj_priv->bit_17 == NULL) |
| 600 | return; |
| 601 | |
| 602 | for (i = 0; i < page_count; i++) { |
| 603 | char new_bit_17 = page_to_phys(obj_priv->pages[i]) >> 17; |
| 604 | if ((new_bit_17 & 0x1) != |
| 605 | (test_bit(i, obj_priv->bit_17) != 0)) { |
| 606 | int ret = i915_gem_swizzle_page(obj_priv->pages[i]); |
| 607 | if (ret != 0) { |
| 608 | DRM_ERROR("Failed to swizzle page\n"); |
| 609 | return; |
| 610 | } |
| 611 | set_page_dirty(obj_priv->pages[i]); |
| 612 | } |
| 613 | } |
| 614 | } |
| 615 | |
| 616 | void |
| 617 | i915_gem_object_save_bit_17_swizzle(struct drm_gem_object *obj) |
| 618 | { |
| 619 | struct drm_device *dev = obj->dev; |
| 620 | drm_i915_private_t *dev_priv = dev->dev_private; |
| 621 | struct drm_i915_gem_object *obj_priv = obj->driver_private; |
| 622 | int page_count = obj->size >> PAGE_SHIFT; |
| 623 | int i; |
| 624 | |
| 625 | if (dev_priv->mm.bit_6_swizzle_x != I915_BIT_6_SWIZZLE_9_10_17) |
| 626 | return; |
| 627 | |
| 628 | if (obj_priv->bit_17 == NULL) { |
| 629 | obj_priv->bit_17 = kmalloc(BITS_TO_LONGS(page_count) * |
| 630 | sizeof(long), GFP_KERNEL); |
| 631 | if (obj_priv->bit_17 == NULL) { |
| 632 | DRM_ERROR("Failed to allocate memory for bit 17 " |
| 633 | "record\n"); |
| 634 | return; |
| 635 | } |
| 636 | } |
| 637 | |
| 638 | for (i = 0; i < page_count; i++) { |
| 639 | if (page_to_phys(obj_priv->pages[i]) & (1 << 17)) |
| 640 | __set_bit(i, obj_priv->bit_17); |
| 641 | else |
| 642 | __clear_bit(i, obj_priv->bit_17); |
| 643 | } |
| 644 | } |