| 1 | // SPDX-License-Identifier: MIT | 
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| 2 | /* | 
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| 3 | * Copyright © 2023 Intel Corporation | 
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| 4 | */ | 
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| 5 |  | 
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| 6 | #include <linux/debugfs.h> | 
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| 7 |  | 
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| 8 | #include <drm/drm_print.h> | 
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| 9 |  | 
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| 10 | #include "i9xx_wm.h" | 
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| 11 | #include "intel_display_core.h" | 
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| 12 | #include "intel_display_types.h" | 
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| 13 | #include "intel_wm.h" | 
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| 14 | #include "skl_watermark.h" | 
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| 15 |  | 
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| 16 | /** | 
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| 17 | * intel_update_watermarks - update FIFO watermark values based on current modes | 
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| 18 | * @display: display device | 
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| 19 | * | 
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| 20 | * Calculate watermark values for the various WM regs based on current mode | 
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| 21 | * and plane configuration. | 
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| 22 | * | 
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| 23 | * There are several cases to deal with here: | 
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| 24 | *   - normal (i.e. non-self-refresh) | 
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| 25 | *   - self-refresh (SR) mode | 
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| 26 | *   - lines are large relative to FIFO size (buffer can hold up to 2) | 
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| 27 | *   - lines are small relative to FIFO size (buffer can hold more than 2 | 
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| 28 | *     lines), so need to account for TLB latency | 
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| 29 | * | 
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| 30 | *   The normal calculation is: | 
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| 31 | *     watermark = dotclock * bytes per pixel * latency | 
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| 32 | *   where latency is platform & configuration dependent (we assume pessimal | 
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| 33 | *   values here). | 
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| 34 | * | 
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| 35 | *   The SR calculation is: | 
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| 36 | *     watermark = (trunc(latency/line time)+1) * surface width * | 
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| 37 | *       bytes per pixel | 
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| 38 | *   where | 
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| 39 | *     line time = htotal / dotclock | 
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| 40 | *     surface width = hdisplay for normal plane and 64 for cursor | 
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| 41 | *   and latency is assumed to be high, as above. | 
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| 42 | * | 
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| 43 | * The final value programmed to the register should always be rounded up, | 
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| 44 | * and include an extra 2 entries to account for clock crossings. | 
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| 45 | * | 
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| 46 | * We don't use the sprite, so we can ignore that.  And on Crestline we have | 
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| 47 | * to set the non-SR watermarks to 8. | 
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| 48 | */ | 
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| 49 | void intel_update_watermarks(struct intel_display *display) | 
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| 50 | { | 
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| 51 | if (display->funcs.wm->update_wm) | 
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| 52 | display->funcs.wm->update_wm(display); | 
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| 53 | } | 
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| 54 |  | 
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| 55 | int intel_wm_compute(struct intel_atomic_state *state, | 
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| 56 | struct intel_crtc *crtc) | 
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| 57 | { | 
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| 58 | struct intel_display *display = to_intel_display(state); | 
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| 59 |  | 
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| 60 | if (!display->funcs.wm->compute_watermarks) | 
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| 61 | return 0; | 
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| 62 |  | 
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| 63 | return display->funcs.wm->compute_watermarks(state, crtc); | 
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| 64 | } | 
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| 65 |  | 
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| 66 | bool intel_initial_watermarks(struct intel_atomic_state *state, | 
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| 67 | struct intel_crtc *crtc) | 
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| 68 | { | 
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| 69 | struct intel_display *display = to_intel_display(state); | 
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| 70 |  | 
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| 71 | if (display->funcs.wm->initial_watermarks) { | 
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| 72 | display->funcs.wm->initial_watermarks(state, crtc); | 
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| 73 | return true; | 
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| 74 | } | 
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| 75 |  | 
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| 76 | return false; | 
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| 77 | } | 
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| 78 |  | 
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| 79 | void intel_atomic_update_watermarks(struct intel_atomic_state *state, | 
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| 80 | struct intel_crtc *crtc) | 
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| 81 | { | 
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| 82 | struct intel_display *display = to_intel_display(state); | 
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| 83 |  | 
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| 84 | if (display->funcs.wm->atomic_update_watermarks) | 
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| 85 | display->funcs.wm->atomic_update_watermarks(state, crtc); | 
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| 86 | } | 
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| 87 |  | 
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| 88 | void intel_optimize_watermarks(struct intel_atomic_state *state, | 
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| 89 | struct intel_crtc *crtc) | 
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| 90 | { | 
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| 91 | struct intel_display *display = to_intel_display(state); | 
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| 92 |  | 
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| 93 | if (display->funcs.wm->optimize_watermarks) | 
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| 94 | display->funcs.wm->optimize_watermarks(state, crtc); | 
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| 95 | } | 
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| 96 |  | 
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| 97 | int intel_compute_global_watermarks(struct intel_atomic_state *state) | 
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| 98 | { | 
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| 99 | struct intel_display *display = to_intel_display(state); | 
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| 100 |  | 
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| 101 | if (display->funcs.wm->compute_global_watermarks) | 
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| 102 | return display->funcs.wm->compute_global_watermarks(state); | 
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| 103 |  | 
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| 104 | return 0; | 
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| 105 | } | 
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| 106 |  | 
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| 107 | void intel_wm_get_hw_state(struct intel_display *display) | 
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| 108 | { | 
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| 109 | if (display->funcs.wm->get_hw_state) | 
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| 110 | return display->funcs.wm->get_hw_state(display); | 
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| 111 | } | 
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| 112 |  | 
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| 113 | void intel_wm_sanitize(struct intel_display *display) | 
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| 114 | { | 
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| 115 | if (display->funcs.wm->sanitize) | 
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| 116 | return display->funcs.wm->sanitize(display); | 
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| 117 | } | 
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| 118 |  | 
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| 119 | bool intel_wm_plane_visible(const struct intel_crtc_state *crtc_state, | 
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| 120 | const struct intel_plane_state *plane_state) | 
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| 121 | { | 
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| 122 | struct intel_plane *plane = to_intel_plane(plane_state->uapi.plane); | 
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| 123 |  | 
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| 124 | /* FIXME check the 'enable' instead */ | 
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| 125 | if (!crtc_state->hw.active) | 
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| 126 | return false; | 
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| 127 |  | 
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| 128 | /* | 
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| 129 | * Treat cursor with fb as always visible since cursor updates | 
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| 130 | * can happen faster than the vrefresh rate, and the current | 
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| 131 | * watermark code doesn't handle that correctly. Cursor updates | 
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| 132 | * which set/clear the fb or change the cursor size are going | 
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| 133 | * to get throttled by intel_legacy_cursor_update() to work | 
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| 134 | * around this problem with the watermark code. | 
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| 135 | */ | 
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| 136 | if (plane->id == PLANE_CURSOR) | 
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| 137 | return plane_state->hw.fb != NULL; | 
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| 138 | else | 
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| 139 | return plane_state->uapi.visible; | 
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| 140 | } | 
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| 141 |  | 
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| 142 | void intel_print_wm_latency(struct intel_display *display, | 
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| 143 | const char *name, const u16 wm[]) | 
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| 144 | { | 
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| 145 | int level; | 
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| 146 |  | 
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| 147 | for (level = 0; level < display->wm.num_levels; level++) { | 
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| 148 | unsigned int latency = wm[level]; | 
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| 149 |  | 
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| 150 | if (latency == 0) { | 
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| 151 | drm_dbg_kms(display->drm, | 
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| 152 | "%s WM%d latency not provided\n", | 
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| 153 | name, level); | 
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| 154 | continue; | 
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| 155 | } | 
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| 156 |  | 
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| 157 | /* | 
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| 158 | * - latencies are in us on gen9. | 
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| 159 | * - before then, WM1+ latency values are in 0.5us units | 
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| 160 | */ | 
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| 161 | if (DISPLAY_VER(display) >= 9) | 
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| 162 | latency *= 10; | 
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| 163 | else if (level > 0) | 
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| 164 | latency *= 5; | 
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| 165 |  | 
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| 166 | drm_dbg_kms(display->drm, | 
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| 167 | "%s WM%d latency %u (%u.%u usec)\n", name, level, | 
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| 168 | wm[level], latency / 10, latency % 10); | 
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| 169 | } | 
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| 170 | } | 
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| 171 |  | 
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| 172 | void intel_wm_init(struct intel_display *display) | 
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| 173 | { | 
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| 174 | if (DISPLAY_VER(display) >= 9) | 
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| 175 | skl_wm_init(display); | 
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| 176 | else | 
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| 177 | i9xx_wm_init(display); | 
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| 178 | } | 
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| 179 |  | 
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| 180 | static void wm_latency_show(struct seq_file *m, const u16 wm[8]) | 
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| 181 | { | 
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| 182 | struct intel_display *display = m->private; | 
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| 183 | int level; | 
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| 184 |  | 
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| 185 | drm_modeset_lock_all(dev: display->drm); | 
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| 186 |  | 
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| 187 | for (level = 0; level < display->wm.num_levels; level++) { | 
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| 188 | unsigned int latency = wm[level]; | 
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| 189 |  | 
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| 190 | /* | 
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| 191 | * - WM1+ latency values in 0.5us units | 
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| 192 | * - latencies are in us on gen9/vlv/chv | 
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| 193 | */ | 
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| 194 | if (DISPLAY_VER(display) >= 9 || | 
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| 195 | display->platform.valleyview || | 
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| 196 | display->platform.cherryview || | 
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| 197 | display->platform.g4x) | 
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| 198 | latency *= 10; | 
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| 199 | else if (level > 0) | 
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| 200 | latency *= 5; | 
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| 201 |  | 
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| 202 | seq_printf(m, fmt: "WM%d %u (%u.%u usec)\n", | 
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| 203 | level, wm[level], latency / 10, latency % 10); | 
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| 204 | } | 
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| 205 |  | 
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| 206 | drm_modeset_unlock_all(dev: display->drm); | 
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| 207 | } | 
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| 208 |  | 
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| 209 | static int pri_wm_latency_show(struct seq_file *m, void *data) | 
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| 210 | { | 
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| 211 | struct intel_display *display = m->private; | 
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| 212 | const u16 *latencies; | 
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| 213 |  | 
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| 214 | if (DISPLAY_VER(display) >= 9) | 
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| 215 | latencies = display->wm.skl_latency; | 
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| 216 | else | 
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| 217 | latencies = display->wm.pri_latency; | 
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| 218 |  | 
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| 219 | wm_latency_show(m, wm: latencies); | 
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| 220 |  | 
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| 221 | return 0; | 
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| 222 | } | 
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| 223 |  | 
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| 224 | static int spr_wm_latency_show(struct seq_file *m, void *data) | 
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| 225 | { | 
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| 226 | struct intel_display *display = m->private; | 
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| 227 | const u16 *latencies; | 
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| 228 |  | 
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| 229 | if (DISPLAY_VER(display) >= 9) | 
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| 230 | latencies = display->wm.skl_latency; | 
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| 231 | else | 
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| 232 | latencies = display->wm.spr_latency; | 
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| 233 |  | 
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| 234 | wm_latency_show(m, wm: latencies); | 
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| 235 |  | 
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| 236 | return 0; | 
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| 237 | } | 
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| 238 |  | 
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| 239 | static int cur_wm_latency_show(struct seq_file *m, void *data) | 
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| 240 | { | 
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| 241 | struct intel_display *display = m->private; | 
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| 242 | const u16 *latencies; | 
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| 243 |  | 
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| 244 | if (DISPLAY_VER(display) >= 9) | 
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| 245 | latencies = display->wm.skl_latency; | 
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| 246 | else | 
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| 247 | latencies = display->wm.cur_latency; | 
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| 248 |  | 
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| 249 | wm_latency_show(m, wm: latencies); | 
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| 250 |  | 
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| 251 | return 0; | 
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| 252 | } | 
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| 253 |  | 
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| 254 | static int pri_wm_latency_open(struct inode *inode, struct file *file) | 
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| 255 | { | 
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| 256 | struct intel_display *display = inode->i_private; | 
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| 257 |  | 
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| 258 | if (DISPLAY_VER(display) < 5 && !display->platform.g4x) | 
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| 259 | return -ENODEV; | 
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| 260 |  | 
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| 261 | return single_open(file, pri_wm_latency_show, display); | 
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| 262 | } | 
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| 263 |  | 
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| 264 | static int spr_wm_latency_open(struct inode *inode, struct file *file) | 
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| 265 | { | 
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| 266 | struct intel_display *display = inode->i_private; | 
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| 267 |  | 
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| 268 | if (HAS_GMCH(display)) | 
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| 269 | return -ENODEV; | 
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| 270 |  | 
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| 271 | return single_open(file, spr_wm_latency_show, display); | 
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| 272 | } | 
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| 273 |  | 
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| 274 | static int cur_wm_latency_open(struct inode *inode, struct file *file) | 
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| 275 | { | 
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| 276 | struct intel_display *display = inode->i_private; | 
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| 277 |  | 
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| 278 | if (HAS_GMCH(display)) | 
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| 279 | return -ENODEV; | 
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| 280 |  | 
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| 281 | return single_open(file, cur_wm_latency_show, display); | 
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| 282 | } | 
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| 283 |  | 
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| 284 | static ssize_t wm_latency_write(struct file *file, const char __user *ubuf, | 
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| 285 | size_t len, loff_t *offp, u16 wm[8]) | 
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| 286 | { | 
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| 287 | struct seq_file *m = file->private_data; | 
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| 288 | struct intel_display *display = m->private; | 
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| 289 | u16 new[8] = {}; | 
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| 290 | int level; | 
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| 291 | int ret; | 
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| 292 | char tmp[32]; | 
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| 293 |  | 
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| 294 | if (len >= sizeof(tmp)) | 
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| 295 | return -EINVAL; | 
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| 296 |  | 
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| 297 | if (copy_from_user(to: tmp, from: ubuf, n: len)) | 
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| 298 | return -EFAULT; | 
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| 299 |  | 
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| 300 | tmp[len] = '\0'; | 
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| 301 |  | 
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| 302 | ret = sscanf(tmp, "%hu %hu %hu %hu %hu %hu %hu %hu", | 
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| 303 | &new[0], &new[1], &new[2], &new[3], | 
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| 304 | &new[4], &new[5], &new[6], &new[7]); | 
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| 305 | if (ret != display->wm.num_levels) | 
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| 306 | return -EINVAL; | 
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| 307 |  | 
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| 308 | drm_modeset_lock_all(dev: display->drm); | 
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| 309 |  | 
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| 310 | for (level = 0; level < display->wm.num_levels; level++) | 
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| 311 | wm[level] = new[level]; | 
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| 312 |  | 
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| 313 | drm_modeset_unlock_all(dev: display->drm); | 
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| 314 |  | 
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| 315 | return len; | 
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| 316 | } | 
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| 317 |  | 
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| 318 | static ssize_t pri_wm_latency_write(struct file *file, const char __user *ubuf, | 
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| 319 | size_t len, loff_t *offp) | 
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| 320 | { | 
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| 321 | struct seq_file *m = file->private_data; | 
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| 322 | struct intel_display *display = m->private; | 
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| 323 | u16 *latencies; | 
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| 324 |  | 
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| 325 | if (DISPLAY_VER(display) >= 9) | 
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| 326 | latencies = display->wm.skl_latency; | 
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| 327 | else | 
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| 328 | latencies = display->wm.pri_latency; | 
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| 329 |  | 
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| 330 | return wm_latency_write(file, ubuf, len, offp, wm: latencies); | 
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| 331 | } | 
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| 332 |  | 
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| 333 | static ssize_t spr_wm_latency_write(struct file *file, const char __user *ubuf, | 
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| 334 | size_t len, loff_t *offp) | 
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| 335 | { | 
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| 336 | struct seq_file *m = file->private_data; | 
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| 337 | struct intel_display *display = m->private; | 
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| 338 | u16 *latencies; | 
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| 339 |  | 
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| 340 | if (DISPLAY_VER(display) >= 9) | 
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| 341 | latencies = display->wm.skl_latency; | 
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| 342 | else | 
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| 343 | latencies = display->wm.spr_latency; | 
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| 344 |  | 
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| 345 | return wm_latency_write(file, ubuf, len, offp, wm: latencies); | 
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| 346 | } | 
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| 347 |  | 
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| 348 | static ssize_t cur_wm_latency_write(struct file *file, const char __user *ubuf, | 
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| 349 | size_t len, loff_t *offp) | 
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| 350 | { | 
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| 351 | struct seq_file *m = file->private_data; | 
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| 352 | struct intel_display *display = m->private; | 
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| 353 | u16 *latencies; | 
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| 354 |  | 
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| 355 | if (DISPLAY_VER(display) >= 9) | 
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| 356 | latencies = display->wm.skl_latency; | 
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| 357 | else | 
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| 358 | latencies = display->wm.cur_latency; | 
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| 359 |  | 
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| 360 | return wm_latency_write(file, ubuf, len, offp, wm: latencies); | 
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| 361 | } | 
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| 362 |  | 
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| 363 | static const struct file_operations i915_pri_wm_latency_fops = { | 
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| 364 | .owner = THIS_MODULE, | 
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| 365 | .open = pri_wm_latency_open, | 
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| 366 | .read = seq_read, | 
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| 367 | .llseek = seq_lseek, | 
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| 368 | .release = single_release, | 
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| 369 | .write = pri_wm_latency_write | 
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| 370 | }; | 
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| 371 |  | 
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| 372 | static const struct file_operations i915_spr_wm_latency_fops = { | 
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| 373 | .owner = THIS_MODULE, | 
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| 374 | .open = spr_wm_latency_open, | 
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| 375 | .read = seq_read, | 
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| 376 | .llseek = seq_lseek, | 
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| 377 | .release = single_release, | 
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| 378 | .write = spr_wm_latency_write | 
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| 379 | }; | 
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| 380 |  | 
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| 381 | static const struct file_operations i915_cur_wm_latency_fops = { | 
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| 382 | .owner = THIS_MODULE, | 
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| 383 | .open = cur_wm_latency_open, | 
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| 384 | .read = seq_read, | 
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| 385 | .llseek = seq_lseek, | 
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| 386 | .release = single_release, | 
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| 387 | .write = cur_wm_latency_write | 
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| 388 | }; | 
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| 389 |  | 
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| 390 | void intel_wm_debugfs_register(struct intel_display *display) | 
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| 391 | { | 
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| 392 | struct dentry *debugfs_root = display->drm->debugfs_root; | 
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| 393 |  | 
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| 394 | debugfs_create_file( "i915_pri_wm_latency", 0644, debugfs_root, | 
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| 395 | display, &i915_pri_wm_latency_fops); | 
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| 396 |  | 
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| 397 | debugfs_create_file( "i915_spr_wm_latency", 0644, debugfs_root, | 
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| 398 | display, &i915_spr_wm_latency_fops); | 
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| 399 |  | 
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| 400 | debugfs_create_file( "i915_cur_wm_latency", 0644, debugfs_root, | 
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| 401 | display, &i915_cur_wm_latency_fops); | 
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| 402 |  | 
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| 403 | skl_watermark_debugfs_register(display); | 
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| 404 | } | 
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| 405 |  | 
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