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![Linus Torvalds](/assets/img/avatar_default.png)
Merge more updates from Andrew Morton: "190 patches. Subsystems affected by this patch series: mm (hugetlb, userfaultfd, vmscan, kconfig, proc, z3fold, zbud, ras, mempolicy, memblock, migration, thp, nommu, kconfig, madvise, memory-hotplug, zswap, zsmalloc, zram, cleanups, kfence, and hmm), procfs, sysctl, misc, core-kernel, lib, lz4, checkpatch, init, kprobes, nilfs2, hfs, signals, exec, kcov, selftests, compress/decompress, and ipc" * emailed patches from Andrew Morton <akpm@linux-foundation.org>: (190 commits) ipc/util.c: use binary search for max_idx ipc/sem.c: use READ_ONCE()/WRITE_ONCE() for use_global_lock ipc: use kmalloc for msg_queue and shmid_kernel ipc sem: use kvmalloc for sem_undo allocation lib/decompressors: remove set but not used variabled 'level' selftests/vm/pkeys: exercise x86 XSAVE init state selftests/vm/pkeys: refill shadow register after implicit kernel write selftests/vm/pkeys: handle negative sys_pkey_alloc() return code selftests/vm/pkeys: fix alloc_random_pkey() to make it really, really random kcov: add __no_sanitize_coverage to fix noinstr for all architectures exec: remove checks in __register_bimfmt() x86: signal: don't do sas_ss_reset() until we are certain that sigframe won't be abandoned hfsplus: report create_date to kstat.btime hfsplus: remove unnecessary oom message nilfs2: remove redundant continue statement in a while-loop kprobes: remove duplicated strong free_insn_page in x86 and s390 init: print out unknown kernel parameters checkpatch: do not complain about positive return values starting with EPOLL checkpatch: improve the indented label test checkpatch: scripts/spdxcheck.py now requires python3 ...
333 lines
8.8 KiB
C
333 lines
8.8 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/* Copyright (c) 2012-2018, The Linux Foundation. All rights reserved.
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* Copyright (C) 2019-2020 Linaro Ltd.
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*/
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#include <linux/types.h>
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#include <linux/device.h>
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#include <linux/interrupt.h>
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#include <linux/notifier.h>
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#include <linux/panic_notifier.h>
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#include <linux/soc/qcom/smem.h>
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#include <linux/soc/qcom/smem_state.h>
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#include "ipa_smp2p.h"
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#include "ipa.h"
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#include "ipa_uc.h"
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#include "ipa_clock.h"
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/**
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* DOC: IPA SMP2P communication with the modem
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*
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* SMP2P is a primitive communication mechanism available between the AP and
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* the modem. The IPA driver uses this for two purposes: to enable the modem
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* to state that the GSI hardware is ready to use; and to communicate the
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* state of the IPA clock in the event of a crash.
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*
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* GSI needs to have early initialization completed before it can be used.
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* This initialization is done either by Trust Zone or by the modem. In the
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* latter case, the modem uses an SMP2P interrupt to tell the AP IPA driver
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* when the GSI is ready to use.
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*
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* The modem is also able to inquire about the current state of the IPA
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* clock by trigging another SMP2P interrupt to the AP. We communicate
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* whether the clock is enabled using two SMP2P state bits--one to
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* indicate the clock state (on or off), and a second to indicate the
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* clock state bit is valid. The modem will poll the valid bit until it
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* is set, and at that time records whether the AP has the IPA clock enabled.
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*
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* Finally, if the AP kernel panics, we update the SMP2P state bits even if
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* we never receive an interrupt from the modem requesting this.
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*/
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/**
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* struct ipa_smp2p - IPA SMP2P information
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* @ipa: IPA pointer
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* @valid_state: SMEM state indicating enabled state is valid
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* @enabled_state: SMEM state to indicate clock is enabled
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* @valid_bit: Valid bit in 32-bit SMEM state mask
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* @enabled_bit: Enabled bit in 32-bit SMEM state mask
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* @enabled_bit: Enabled bit in 32-bit SMEM state mask
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* @clock_query_irq: IPA interrupt triggered by modem for clock query
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* @setup_ready_irq: IPA interrupt triggered by modem to signal GSI ready
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* @clock_on: Whether IPA clock is on
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* @notified: Whether modem has been notified of clock state
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* @disabled: Whether setup ready interrupt handling is disabled
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* @mutex: Mutex protecting ready-interrupt/shutdown interlock
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* @panic_notifier: Panic notifier structure
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*/
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struct ipa_smp2p {
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struct ipa *ipa;
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struct qcom_smem_state *valid_state;
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struct qcom_smem_state *enabled_state;
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u32 valid_bit;
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u32 enabled_bit;
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u32 clock_query_irq;
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u32 setup_ready_irq;
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bool clock_on;
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bool notified;
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bool disabled;
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struct mutex mutex;
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struct notifier_block panic_notifier;
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};
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/**
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* ipa_smp2p_notify() - use SMP2P to tell modem about IPA clock state
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* @smp2p: SMP2P information
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*
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* This is called either when the modem has requested it (by triggering
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* the modem clock query IPA interrupt) or whenever the AP is shutting down
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* (via a panic notifier). It sets the two SMP2P state bits--one saying
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* whether the IPA clock is running, and the other indicating the first bit
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* is valid.
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*/
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static void ipa_smp2p_notify(struct ipa_smp2p *smp2p)
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{
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u32 value;
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u32 mask;
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if (smp2p->notified)
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return;
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smp2p->clock_on = ipa_clock_get_additional(smp2p->ipa);
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/* Signal whether the clock is enabled */
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mask = BIT(smp2p->enabled_bit);
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value = smp2p->clock_on ? mask : 0;
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qcom_smem_state_update_bits(smp2p->enabled_state, mask, value);
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/* Now indicate that the enabled flag is valid */
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mask = BIT(smp2p->valid_bit);
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value = mask;
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qcom_smem_state_update_bits(smp2p->valid_state, mask, value);
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smp2p->notified = true;
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}
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/* Threaded IRQ handler for modem "ipa-clock-query" SMP2P interrupt */
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static irqreturn_t ipa_smp2p_modem_clk_query_isr(int irq, void *dev_id)
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{
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struct ipa_smp2p *smp2p = dev_id;
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ipa_smp2p_notify(smp2p);
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return IRQ_HANDLED;
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}
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static int ipa_smp2p_panic_notifier(struct notifier_block *nb,
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unsigned long action, void *data)
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{
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struct ipa_smp2p *smp2p;
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smp2p = container_of(nb, struct ipa_smp2p, panic_notifier);
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ipa_smp2p_notify(smp2p);
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if (smp2p->clock_on)
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ipa_uc_panic_notifier(smp2p->ipa);
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return NOTIFY_DONE;
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}
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static int ipa_smp2p_panic_notifier_register(struct ipa_smp2p *smp2p)
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{
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/* IPA panic handler needs to run before modem shuts down */
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smp2p->panic_notifier.notifier_call = ipa_smp2p_panic_notifier;
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smp2p->panic_notifier.priority = INT_MAX; /* Do it early */
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return atomic_notifier_chain_register(&panic_notifier_list,
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&smp2p->panic_notifier);
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}
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static void ipa_smp2p_panic_notifier_unregister(struct ipa_smp2p *smp2p)
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{
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atomic_notifier_chain_unregister(&panic_notifier_list,
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&smp2p->panic_notifier);
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}
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/* Threaded IRQ handler for modem "ipa-setup-ready" SMP2P interrupt */
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static irqreturn_t ipa_smp2p_modem_setup_ready_isr(int irq, void *dev_id)
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{
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struct ipa_smp2p *smp2p = dev_id;
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mutex_lock(&smp2p->mutex);
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if (!smp2p->disabled) {
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int ret;
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ret = ipa_setup(smp2p->ipa);
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if (ret)
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dev_err(&smp2p->ipa->pdev->dev,
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"error %d from ipa_setup()\n", ret);
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smp2p->disabled = true;
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}
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mutex_unlock(&smp2p->mutex);
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return IRQ_HANDLED;
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}
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/* Initialize SMP2P interrupts */
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static int ipa_smp2p_irq_init(struct ipa_smp2p *smp2p, const char *name,
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irq_handler_t handler)
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{
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struct device *dev = &smp2p->ipa->pdev->dev;
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unsigned int irq;
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int ret;
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ret = platform_get_irq_byname(smp2p->ipa->pdev, name);
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if (ret <= 0)
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return ret ? : -EINVAL;
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irq = ret;
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ret = request_threaded_irq(irq, NULL, handler, 0, name, smp2p);
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if (ret) {
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dev_err(dev, "error %d requesting \"%s\" IRQ\n", ret, name);
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return ret;
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}
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return irq;
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}
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static void ipa_smp2p_irq_exit(struct ipa_smp2p *smp2p, u32 irq)
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{
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free_irq(irq, smp2p);
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}
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/* Drop the clock reference if it was taken in ipa_smp2p_notify() */
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static void ipa_smp2p_clock_release(struct ipa *ipa)
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{
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if (!ipa->smp2p->clock_on)
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return;
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ipa_clock_put(ipa);
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ipa->smp2p->clock_on = false;
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}
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/* Initialize the IPA SMP2P subsystem */
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int ipa_smp2p_init(struct ipa *ipa, bool modem_init)
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{
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struct qcom_smem_state *enabled_state;
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struct device *dev = &ipa->pdev->dev;
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struct qcom_smem_state *valid_state;
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struct ipa_smp2p *smp2p;
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u32 enabled_bit;
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u32 valid_bit;
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int ret;
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valid_state = qcom_smem_state_get(dev, "ipa-clock-enabled-valid",
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&valid_bit);
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if (IS_ERR(valid_state))
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return PTR_ERR(valid_state);
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if (valid_bit >= 32) /* BITS_PER_U32 */
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return -EINVAL;
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enabled_state = qcom_smem_state_get(dev, "ipa-clock-enabled",
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&enabled_bit);
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if (IS_ERR(enabled_state))
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return PTR_ERR(enabled_state);
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if (enabled_bit >= 32) /* BITS_PER_U32 */
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return -EINVAL;
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smp2p = kzalloc(sizeof(*smp2p), GFP_KERNEL);
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if (!smp2p)
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return -ENOMEM;
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smp2p->ipa = ipa;
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/* These fields are needed by the clock query interrupt
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* handler, so initialize them now.
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*/
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mutex_init(&smp2p->mutex);
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smp2p->valid_state = valid_state;
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smp2p->valid_bit = valid_bit;
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smp2p->enabled_state = enabled_state;
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smp2p->enabled_bit = enabled_bit;
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/* We have enough information saved to handle notifications */
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ipa->smp2p = smp2p;
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ret = ipa_smp2p_irq_init(smp2p, "ipa-clock-query",
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ipa_smp2p_modem_clk_query_isr);
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if (ret < 0)
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goto err_null_smp2p;
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smp2p->clock_query_irq = ret;
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ret = ipa_smp2p_panic_notifier_register(smp2p);
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if (ret)
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goto err_irq_exit;
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if (modem_init) {
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/* Result will be non-zero (negative for error) */
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ret = ipa_smp2p_irq_init(smp2p, "ipa-setup-ready",
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ipa_smp2p_modem_setup_ready_isr);
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if (ret < 0)
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goto err_notifier_unregister;
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smp2p->setup_ready_irq = ret;
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}
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return 0;
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err_notifier_unregister:
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ipa_smp2p_panic_notifier_unregister(smp2p);
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err_irq_exit:
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ipa_smp2p_irq_exit(smp2p, smp2p->clock_query_irq);
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err_null_smp2p:
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ipa->smp2p = NULL;
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mutex_destroy(&smp2p->mutex);
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kfree(smp2p);
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return ret;
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}
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void ipa_smp2p_exit(struct ipa *ipa)
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{
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struct ipa_smp2p *smp2p = ipa->smp2p;
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if (smp2p->setup_ready_irq)
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ipa_smp2p_irq_exit(smp2p, smp2p->setup_ready_irq);
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ipa_smp2p_panic_notifier_unregister(smp2p);
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ipa_smp2p_irq_exit(smp2p, smp2p->clock_query_irq);
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/* We won't get notified any more; drop clock reference (if any) */
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ipa_smp2p_clock_release(ipa);
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ipa->smp2p = NULL;
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mutex_destroy(&smp2p->mutex);
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kfree(smp2p);
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}
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void ipa_smp2p_disable(struct ipa *ipa)
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{
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struct ipa_smp2p *smp2p = ipa->smp2p;
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if (!smp2p->setup_ready_irq)
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return;
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mutex_lock(&smp2p->mutex);
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smp2p->disabled = true;
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mutex_unlock(&smp2p->mutex);
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}
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/* Reset state tracking whether we have notified the modem */
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void ipa_smp2p_notify_reset(struct ipa *ipa)
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{
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struct ipa_smp2p *smp2p = ipa->smp2p;
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u32 mask;
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if (!smp2p->notified)
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return;
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ipa_smp2p_clock_release(ipa);
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/* Reset the clock enabled valid flag */
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mask = BIT(smp2p->valid_bit);
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qcom_smem_state_update_bits(smp2p->valid_state, mask, 0);
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/* Mark the clock disabled for good measure... */
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mask = BIT(smp2p->enabled_bit);
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qcom_smem_state_update_bits(smp2p->enabled_state, mask, 0);
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smp2p->notified = false;
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}
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