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e07515563d
Rename DPM_FLAG_NEVER_SKIP to DPM_FLAG_NO_DIRECT_COMPLETE which matches its purpose more closely. No functional impact. Suggested-by: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Acked-by: Bjorn Helgaas <bhelgaas@google.com> # for PCI parts Acked-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com> Acked-by: Alan Stern <stern@rowland.harvard.edu> Acked-by: Bjorn Helgaas <bhelgaas@google.com> Acked-by: Alex Deucher <alexander.deucher@amd.com>
619 lines
17 KiB
C
619 lines
17 KiB
C
/*
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* Copyright © 2012-2014 Intel Corporation
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice (including the next
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* paragraph) shall be included in all copies or substantial portions of the
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* Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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* IN THE SOFTWARE.
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*
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* Authors:
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* Eugeni Dodonov <eugeni.dodonov@intel.com>
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* Daniel Vetter <daniel.vetter@ffwll.ch>
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*
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*/
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#include <linux/pm_runtime.h>
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#include <drm/drm_print.h>
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#include "i915_drv.h"
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#include "i915_trace.h"
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/**
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* DOC: runtime pm
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*
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* The i915 driver supports dynamic enabling and disabling of entire hardware
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* blocks at runtime. This is especially important on the display side where
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* software is supposed to control many power gates manually on recent hardware,
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* since on the GT side a lot of the power management is done by the hardware.
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* But even there some manual control at the device level is required.
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*
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* Since i915 supports a diverse set of platforms with a unified codebase and
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* hardware engineers just love to shuffle functionality around between power
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* domains there's a sizeable amount of indirection required. This file provides
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* generic functions to the driver for grabbing and releasing references for
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* abstract power domains. It then maps those to the actual power wells
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* present for a given platform.
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*/
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#if IS_ENABLED(CONFIG_DRM_I915_DEBUG_RUNTIME_PM)
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#include <linux/sort.h>
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#define STACKDEPTH 8
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static noinline depot_stack_handle_t __save_depot_stack(void)
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{
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unsigned long entries[STACKDEPTH];
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unsigned int n;
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n = stack_trace_save(entries, ARRAY_SIZE(entries), 1);
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return stack_depot_save(entries, n, GFP_NOWAIT | __GFP_NOWARN);
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}
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static void __print_depot_stack(depot_stack_handle_t stack,
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char *buf, int sz, int indent)
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{
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unsigned long *entries;
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unsigned int nr_entries;
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nr_entries = stack_depot_fetch(stack, &entries);
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stack_trace_snprint(buf, sz, entries, nr_entries, indent);
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}
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static void init_intel_runtime_pm_wakeref(struct intel_runtime_pm *rpm)
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{
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spin_lock_init(&rpm->debug.lock);
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}
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static noinline depot_stack_handle_t
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track_intel_runtime_pm_wakeref(struct intel_runtime_pm *rpm)
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{
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depot_stack_handle_t stack, *stacks;
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unsigned long flags;
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if (!rpm->available)
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return -1;
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stack = __save_depot_stack();
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if (!stack)
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return -1;
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spin_lock_irqsave(&rpm->debug.lock, flags);
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if (!rpm->debug.count)
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rpm->debug.last_acquire = stack;
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stacks = krealloc(rpm->debug.owners,
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(rpm->debug.count + 1) * sizeof(*stacks),
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GFP_NOWAIT | __GFP_NOWARN);
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if (stacks) {
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stacks[rpm->debug.count++] = stack;
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rpm->debug.owners = stacks;
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} else {
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stack = -1;
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}
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spin_unlock_irqrestore(&rpm->debug.lock, flags);
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return stack;
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}
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static void untrack_intel_runtime_pm_wakeref(struct intel_runtime_pm *rpm,
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depot_stack_handle_t stack)
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{
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unsigned long flags, n;
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bool found = false;
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if (unlikely(stack == -1))
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return;
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spin_lock_irqsave(&rpm->debug.lock, flags);
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for (n = rpm->debug.count; n--; ) {
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if (rpm->debug.owners[n] == stack) {
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memmove(rpm->debug.owners + n,
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rpm->debug.owners + n + 1,
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(--rpm->debug.count - n) * sizeof(stack));
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found = true;
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break;
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}
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}
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spin_unlock_irqrestore(&rpm->debug.lock, flags);
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if (WARN(!found,
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"Unmatched wakeref (tracking %lu), count %u\n",
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rpm->debug.count, atomic_read(&rpm->wakeref_count))) {
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char *buf;
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buf = kmalloc(PAGE_SIZE, GFP_NOWAIT | __GFP_NOWARN);
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if (!buf)
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return;
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__print_depot_stack(stack, buf, PAGE_SIZE, 2);
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DRM_DEBUG_DRIVER("wakeref %x from\n%s", stack, buf);
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stack = READ_ONCE(rpm->debug.last_release);
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if (stack) {
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__print_depot_stack(stack, buf, PAGE_SIZE, 2);
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DRM_DEBUG_DRIVER("wakeref last released at\n%s", buf);
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}
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kfree(buf);
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}
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}
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static int cmphandle(const void *_a, const void *_b)
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{
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const depot_stack_handle_t * const a = _a, * const b = _b;
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if (*a < *b)
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return -1;
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else if (*a > *b)
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return 1;
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else
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return 0;
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}
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static void
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__print_intel_runtime_pm_wakeref(struct drm_printer *p,
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const struct intel_runtime_pm_debug *dbg)
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{
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unsigned long i;
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char *buf;
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buf = kmalloc(PAGE_SIZE, GFP_NOWAIT | __GFP_NOWARN);
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if (!buf)
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return;
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if (dbg->last_acquire) {
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__print_depot_stack(dbg->last_acquire, buf, PAGE_SIZE, 2);
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drm_printf(p, "Wakeref last acquired:\n%s", buf);
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}
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if (dbg->last_release) {
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__print_depot_stack(dbg->last_release, buf, PAGE_SIZE, 2);
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drm_printf(p, "Wakeref last released:\n%s", buf);
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}
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drm_printf(p, "Wakeref count: %lu\n", dbg->count);
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sort(dbg->owners, dbg->count, sizeof(*dbg->owners), cmphandle, NULL);
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for (i = 0; i < dbg->count; i++) {
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depot_stack_handle_t stack = dbg->owners[i];
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unsigned long rep;
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rep = 1;
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while (i + 1 < dbg->count && dbg->owners[i + 1] == stack)
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rep++, i++;
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__print_depot_stack(stack, buf, PAGE_SIZE, 2);
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drm_printf(p, "Wakeref x%lu taken at:\n%s", rep, buf);
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}
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kfree(buf);
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}
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static noinline void
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__untrack_all_wakerefs(struct intel_runtime_pm_debug *debug,
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struct intel_runtime_pm_debug *saved)
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{
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*saved = *debug;
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debug->owners = NULL;
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debug->count = 0;
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debug->last_release = __save_depot_stack();
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}
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static void
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dump_and_free_wakeref_tracking(struct intel_runtime_pm_debug *debug)
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{
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if (debug->count) {
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struct drm_printer p = drm_debug_printer("i915");
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__print_intel_runtime_pm_wakeref(&p, debug);
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}
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kfree(debug->owners);
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}
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static noinline void
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__intel_wakeref_dec_and_check_tracking(struct intel_runtime_pm *rpm)
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{
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struct intel_runtime_pm_debug dbg = {};
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unsigned long flags;
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if (!atomic_dec_and_lock_irqsave(&rpm->wakeref_count,
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&rpm->debug.lock,
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flags))
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return;
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__untrack_all_wakerefs(&rpm->debug, &dbg);
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spin_unlock_irqrestore(&rpm->debug.lock, flags);
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dump_and_free_wakeref_tracking(&dbg);
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}
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static noinline void
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untrack_all_intel_runtime_pm_wakerefs(struct intel_runtime_pm *rpm)
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{
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struct intel_runtime_pm_debug dbg = {};
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unsigned long flags;
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spin_lock_irqsave(&rpm->debug.lock, flags);
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__untrack_all_wakerefs(&rpm->debug, &dbg);
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spin_unlock_irqrestore(&rpm->debug.lock, flags);
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dump_and_free_wakeref_tracking(&dbg);
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}
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void print_intel_runtime_pm_wakeref(struct intel_runtime_pm *rpm,
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struct drm_printer *p)
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{
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struct intel_runtime_pm_debug dbg = {};
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do {
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unsigned long alloc = dbg.count;
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depot_stack_handle_t *s;
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spin_lock_irq(&rpm->debug.lock);
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dbg.count = rpm->debug.count;
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if (dbg.count <= alloc) {
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memcpy(dbg.owners,
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rpm->debug.owners,
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dbg.count * sizeof(*s));
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}
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dbg.last_acquire = rpm->debug.last_acquire;
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dbg.last_release = rpm->debug.last_release;
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spin_unlock_irq(&rpm->debug.lock);
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if (dbg.count <= alloc)
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break;
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s = krealloc(dbg.owners,
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dbg.count * sizeof(*s),
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GFP_NOWAIT | __GFP_NOWARN);
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if (!s)
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goto out;
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dbg.owners = s;
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} while (1);
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__print_intel_runtime_pm_wakeref(p, &dbg);
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out:
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kfree(dbg.owners);
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}
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#else
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static void init_intel_runtime_pm_wakeref(struct intel_runtime_pm *rpm)
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{
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}
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static depot_stack_handle_t
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track_intel_runtime_pm_wakeref(struct intel_runtime_pm *rpm)
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{
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return -1;
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}
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static void untrack_intel_runtime_pm_wakeref(struct intel_runtime_pm *rpm,
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intel_wakeref_t wref)
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{
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}
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static void
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__intel_wakeref_dec_and_check_tracking(struct intel_runtime_pm *rpm)
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{
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atomic_dec(&rpm->wakeref_count);
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}
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static void
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untrack_all_intel_runtime_pm_wakerefs(struct intel_runtime_pm *rpm)
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{
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}
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#endif
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static void
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intel_runtime_pm_acquire(struct intel_runtime_pm *rpm, bool wakelock)
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{
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if (wakelock) {
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atomic_add(1 + INTEL_RPM_WAKELOCK_BIAS, &rpm->wakeref_count);
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assert_rpm_wakelock_held(rpm);
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} else {
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atomic_inc(&rpm->wakeref_count);
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assert_rpm_raw_wakeref_held(rpm);
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}
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}
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static void
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intel_runtime_pm_release(struct intel_runtime_pm *rpm, int wakelock)
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{
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if (wakelock) {
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assert_rpm_wakelock_held(rpm);
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atomic_sub(INTEL_RPM_WAKELOCK_BIAS, &rpm->wakeref_count);
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} else {
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assert_rpm_raw_wakeref_held(rpm);
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}
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__intel_wakeref_dec_and_check_tracking(rpm);
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}
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static intel_wakeref_t __intel_runtime_pm_get(struct intel_runtime_pm *rpm,
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bool wakelock)
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{
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int ret;
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ret = pm_runtime_get_sync(rpm->kdev);
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WARN_ONCE(ret < 0, "pm_runtime_get_sync() failed: %d\n", ret);
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intel_runtime_pm_acquire(rpm, wakelock);
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return track_intel_runtime_pm_wakeref(rpm);
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}
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/**
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* intel_runtime_pm_get_raw - grab a raw runtime pm reference
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* @rpm: the intel_runtime_pm structure
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*
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* This is the unlocked version of intel_display_power_is_enabled() and should
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* only be used from error capture and recovery code where deadlocks are
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* possible.
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* This function grabs a device-level runtime pm reference (mostly used for
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* asynchronous PM management from display code) and ensures that it is powered
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* up. Raw references are not considered during wakelock assert checks.
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*
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* Any runtime pm reference obtained by this function must have a symmetric
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* call to intel_runtime_pm_put_raw() to release the reference again.
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*
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* Returns: the wakeref cookie to pass to intel_runtime_pm_put_raw(), evaluates
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* as True if the wakeref was acquired, or False otherwise.
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*/
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intel_wakeref_t intel_runtime_pm_get_raw(struct intel_runtime_pm *rpm)
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{
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return __intel_runtime_pm_get(rpm, false);
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}
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/**
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* intel_runtime_pm_get - grab a runtime pm reference
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* @rpm: the intel_runtime_pm structure
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*
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* This function grabs a device-level runtime pm reference (mostly used for GEM
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* code to ensure the GTT or GT is on) and ensures that it is powered up.
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*
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* Any runtime pm reference obtained by this function must have a symmetric
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* call to intel_runtime_pm_put() to release the reference again.
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*
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* Returns: the wakeref cookie to pass to intel_runtime_pm_put()
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*/
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intel_wakeref_t intel_runtime_pm_get(struct intel_runtime_pm *rpm)
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{
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return __intel_runtime_pm_get(rpm, true);
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}
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/**
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* intel_runtime_pm_get_if_in_use - grab a runtime pm reference if device in use
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* @rpm: the intel_runtime_pm structure
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*
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* This function grabs a device-level runtime pm reference if the device is
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* already in use and ensures that it is powered up. It is illegal to try
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* and access the HW should intel_runtime_pm_get_if_in_use() report failure.
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*
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* Any runtime pm reference obtained by this function must have a symmetric
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* call to intel_runtime_pm_put() to release the reference again.
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*
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* Returns: the wakeref cookie to pass to intel_runtime_pm_put(), evaluates
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* as True if the wakeref was acquired, or False otherwise.
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*/
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intel_wakeref_t intel_runtime_pm_get_if_in_use(struct intel_runtime_pm *rpm)
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{
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if (IS_ENABLED(CONFIG_PM)) {
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/*
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* In cases runtime PM is disabled by the RPM core and we get
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* an -EINVAL return value we are not supposed to call this
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* function, since the power state is undefined. This applies
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* atm to the late/early system suspend/resume handlers.
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*/
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if (pm_runtime_get_if_in_use(rpm->kdev) <= 0)
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return 0;
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}
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intel_runtime_pm_acquire(rpm, true);
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return track_intel_runtime_pm_wakeref(rpm);
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}
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/**
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* intel_runtime_pm_get_noresume - grab a runtime pm reference
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* @rpm: the intel_runtime_pm structure
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*
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* This function grabs a device-level runtime pm reference (mostly used for GEM
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* code to ensure the GTT or GT is on).
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*
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* It will _not_ power up the device but instead only check that it's powered
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* on. Therefore it is only valid to call this functions from contexts where
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* the device is known to be powered up and where trying to power it up would
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* result in hilarity and deadlocks. That pretty much means only the system
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* suspend/resume code where this is used to grab runtime pm references for
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* delayed setup down in work items.
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*
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* Any runtime pm reference obtained by this function must have a symmetric
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* call to intel_runtime_pm_put() to release the reference again.
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*
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* Returns: the wakeref cookie to pass to intel_runtime_pm_put()
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*/
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intel_wakeref_t intel_runtime_pm_get_noresume(struct intel_runtime_pm *rpm)
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{
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assert_rpm_wakelock_held(rpm);
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pm_runtime_get_noresume(rpm->kdev);
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intel_runtime_pm_acquire(rpm, true);
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return track_intel_runtime_pm_wakeref(rpm);
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}
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static void __intel_runtime_pm_put(struct intel_runtime_pm *rpm,
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intel_wakeref_t wref,
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bool wakelock)
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{
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struct device *kdev = rpm->kdev;
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untrack_intel_runtime_pm_wakeref(rpm, wref);
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intel_runtime_pm_release(rpm, wakelock);
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pm_runtime_mark_last_busy(kdev);
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pm_runtime_put_autosuspend(kdev);
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}
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|
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/**
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* intel_runtime_pm_put_raw - release a raw runtime pm reference
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* @rpm: the intel_runtime_pm structure
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* @wref: wakeref acquired for the reference that is being released
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*
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* This function drops the device-level runtime pm reference obtained by
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* intel_runtime_pm_get_raw() and might power down the corresponding
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* hardware block right away if this is the last reference.
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*/
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void
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intel_runtime_pm_put_raw(struct intel_runtime_pm *rpm, intel_wakeref_t wref)
|
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{
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__intel_runtime_pm_put(rpm, wref, false);
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}
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|
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/**
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* intel_runtime_pm_put_unchecked - release an unchecked runtime pm reference
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|
* @rpm: the intel_runtime_pm structure
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*
|
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* This function drops the device-level runtime pm reference obtained by
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* intel_runtime_pm_get() and might power down the corresponding
|
|
* hardware block right away if this is the last reference.
|
|
*
|
|
* This function exists only for historical reasons and should be avoided in
|
|
* new code, as the correctness of its use cannot be checked. Always use
|
|
* intel_runtime_pm_put() instead.
|
|
*/
|
|
void intel_runtime_pm_put_unchecked(struct intel_runtime_pm *rpm)
|
|
{
|
|
__intel_runtime_pm_put(rpm, -1, true);
|
|
}
|
|
|
|
#if IS_ENABLED(CONFIG_DRM_I915_DEBUG_RUNTIME_PM)
|
|
/**
|
|
* intel_runtime_pm_put - release a runtime pm reference
|
|
* @rpm: the intel_runtime_pm structure
|
|
* @wref: wakeref acquired for the reference that is being released
|
|
*
|
|
* This function drops the device-level runtime pm reference obtained by
|
|
* intel_runtime_pm_get() and might power down the corresponding
|
|
* hardware block right away if this is the last reference.
|
|
*/
|
|
void intel_runtime_pm_put(struct intel_runtime_pm *rpm, intel_wakeref_t wref)
|
|
{
|
|
__intel_runtime_pm_put(rpm, wref, true);
|
|
}
|
|
#endif
|
|
|
|
/**
|
|
* intel_runtime_pm_enable - enable runtime pm
|
|
* @rpm: the intel_runtime_pm structure
|
|
*
|
|
* This function enables runtime pm at the end of the driver load sequence.
|
|
*
|
|
* Note that this function does currently not enable runtime pm for the
|
|
* subordinate display power domains. That is done by
|
|
* intel_power_domains_enable().
|
|
*/
|
|
void intel_runtime_pm_enable(struct intel_runtime_pm *rpm)
|
|
{
|
|
struct device *kdev = rpm->kdev;
|
|
|
|
/*
|
|
* Disable the system suspend direct complete optimization, which can
|
|
* leave the device suspended skipping the driver's suspend handlers
|
|
* if the device was already runtime suspended. This is needed due to
|
|
* the difference in our runtime and system suspend sequence and
|
|
* becaue the HDA driver may require us to enable the audio power
|
|
* domain during system suspend.
|
|
*/
|
|
dev_pm_set_driver_flags(kdev, DPM_FLAG_NO_DIRECT_COMPLETE);
|
|
|
|
pm_runtime_set_autosuspend_delay(kdev, 10000); /* 10s */
|
|
pm_runtime_mark_last_busy(kdev);
|
|
|
|
/*
|
|
* Take a permanent reference to disable the RPM functionality and drop
|
|
* it only when unloading the driver. Use the low level get/put helpers,
|
|
* so the driver's own RPM reference tracking asserts also work on
|
|
* platforms without RPM support.
|
|
*/
|
|
if (!rpm->available) {
|
|
int ret;
|
|
|
|
pm_runtime_dont_use_autosuspend(kdev);
|
|
ret = pm_runtime_get_sync(kdev);
|
|
WARN(ret < 0, "pm_runtime_get_sync() failed: %d\n", ret);
|
|
} else {
|
|
pm_runtime_use_autosuspend(kdev);
|
|
}
|
|
|
|
/*
|
|
* The core calls the driver load handler with an RPM reference held.
|
|
* We drop that here and will reacquire it during unloading in
|
|
* intel_power_domains_fini().
|
|
*/
|
|
pm_runtime_put_autosuspend(kdev);
|
|
}
|
|
|
|
void intel_runtime_pm_disable(struct intel_runtime_pm *rpm)
|
|
{
|
|
struct device *kdev = rpm->kdev;
|
|
|
|
/* Transfer rpm ownership back to core */
|
|
WARN(pm_runtime_get_sync(kdev) < 0,
|
|
"Failed to pass rpm ownership back to core\n");
|
|
|
|
pm_runtime_dont_use_autosuspend(kdev);
|
|
|
|
if (!rpm->available)
|
|
pm_runtime_put(kdev);
|
|
}
|
|
|
|
void intel_runtime_pm_driver_release(struct intel_runtime_pm *rpm)
|
|
{
|
|
int count = atomic_read(&rpm->wakeref_count);
|
|
|
|
WARN(count,
|
|
"i915 raw-wakerefs=%d wakelocks=%d on cleanup\n",
|
|
intel_rpm_raw_wakeref_count(count),
|
|
intel_rpm_wakelock_count(count));
|
|
|
|
untrack_all_intel_runtime_pm_wakerefs(rpm);
|
|
}
|
|
|
|
void intel_runtime_pm_init_early(struct intel_runtime_pm *rpm)
|
|
{
|
|
struct drm_i915_private *i915 =
|
|
container_of(rpm, struct drm_i915_private, runtime_pm);
|
|
struct pci_dev *pdev = i915->drm.pdev;
|
|
struct device *kdev = &pdev->dev;
|
|
|
|
rpm->kdev = kdev;
|
|
rpm->available = HAS_RUNTIME_PM(i915);
|
|
|
|
init_intel_runtime_pm_wakeref(rpm);
|
|
}
|