From 4352b8aee98005853aa63f57d6377282de17a33f Mon Sep 17 00:00:00 2001 From: Linus Torvalds Date: Sun, 23 Aug 2026 13:28:57 -0700 Subject: Merge tag 'i3c/for-7.3' of git://git.kernel.org/pub/scm/linux/kernel/git/i3c/linux Pull I3C updates from Alexandre Belloni: "A new driver this cycle, for the AMD AXI I3C controller. There are also new features such as IBI wakeup support, SETAASA device discovery and ACPI support for the the DAA methods, meaning we can now communicate with the SPD devices on DDR5 modules. New driver: - AMD AXI I3C master controller Subsystem: - I3C Common Command Code (CCC) handling improvements, especially around GET CCCs - SETAASA device discovery support - ACPI support for all existing DAA methods like SETDASA, SETNEWDA as well as I2C devices on I3C bus - IBI-based wakeup support Drivers: - dw: SETAASA support - mipi-i3c-hci: advertise IBI wakeup capability, AMD_PT I3C controller support, PIO queue management support for HCI v1.2 - renesas: improve suspend to RAM support, add runtime PM support" * tag 'i3c/for-7.3' of git://git.kernel.org/pub/scm/linux/kernel/git/i3c/linux: (70 commits) i3c: dw: reduce do_daa time if there's no client i3c: mipi-i3c-hci: Add support for AMD_PT I3C controller i3c: mipi-i3c-hci: Add PIO queue management support for HCI v1.2 i3c: mipi-i3c-hci: Fix missing STAT_IBI_STATUS_THLD in PIO mode i3c: dw: rename "pclk" to "apb" to match dt-binding i3c: dw: make struct dw_i3c_cmd smaller i3c: dw: use COMMAND_PORT_TRANSFER_ARG instead of hardcoding i3c: renesas: Don't register devices when ENTDAA times out i3c: master: dw-i3c-master: fix OD timing for first broadcast i3c: mipi-i3c-hci: Advertise IBI wakeup capability i3c: mipi-i3c-hci: Factor out i3c_hci_sysdev() i3c: mipi-i3c-hci-pci: Propagate I3C wakeup requirements to PCI i3c: master: Reject IBI requests from non-IBI-capable devices i3c: master: Add helper to query bus wakeup requirements i3c: master: Report wakeup events for IBIs i3c: master: Support IBI-based wakeup capability i3c: master: Fix potential UAF in i3c_device_match() i3c: master: Fix potential UAF in i3c_device_uevent() i3c: Make dev->desc locking assumptions explicit i3c: master: Fix use-after-free of master->this ... --- crypto/scompress.c | 402 +++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 402 insertions(+) create mode 100644 crypto/scompress.c (limited to 'crypto/scompress.c') diff --git a/crypto/scompress.c b/crypto/scompress.c new file mode 100644 index 000000000..de5422720 --- /dev/null +++ b/crypto/scompress.c @@ -0,0 +1,402 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Synchronous Compression operations + * + * Copyright 2015 LG Electronics Inc. + * Copyright (c) 2016, Intel Corporation + * Author: Giovanni Cabiddu + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include "compress.h" + +struct scomp_scratch { + spinlock_t lock; + union { + void *src __guarded_by(&lock); + unsigned long saddr __guarded_by(&lock); + }; +}; + +static DEFINE_PER_CPU(struct scomp_scratch, scomp_scratch) = { + .lock = __SPIN_LOCK_UNLOCKED(scomp_scratch.lock), +}; + +static const struct crypto_type crypto_scomp_type; +static DEFINE_MUTEX(scomp_lock); +static int scomp_scratch_users __guarded_by(&scomp_lock); + +static cpumask_t scomp_scratch_want; +static void scomp_scratch_workfn(struct work_struct *work); +static DECLARE_WORK(scomp_scratch_work, scomp_scratch_workfn); + +static int __maybe_unused crypto_scomp_report( + struct sk_buff *skb, struct crypto_alg *alg) +{ + struct crypto_report_comp rscomp = { + .type = "scomp", + }; + + return nla_put(skb, CRYPTOCFGA_REPORT_COMPRESS, + sizeof(rscomp), &rscomp); +} + +static void __maybe_unused crypto_scomp_show(struct seq_file *m, + struct crypto_alg *alg) +{ + seq_puts(m, "type : scomp\n"); +} + +static void crypto_scomp_free_scratches(void) + __context_unsafe(/* frees @scratch */) +{ + struct scomp_scratch *scratch; + int i; + + for_each_possible_cpu(i) { + scratch = per_cpu_ptr(&scomp_scratch, i); + + free_page(scratch->saddr); + scratch->src = NULL; + } +} + +static int scomp_alloc_scratch(struct scomp_scratch *scratch, int cpu) +{ + int node = cpu_to_node(cpu); + struct page *page; + + page = alloc_pages_node(node, GFP_KERNEL, 0); + if (!page) + return -ENOMEM; + spin_lock_bh(&scratch->lock); + scratch->src = page_address(page); + spin_unlock_bh(&scratch->lock); + return 0; +} + +static void scomp_scratch_workfn(struct work_struct *work) +{ + int cpu; + + for_each_cpu(cpu, &scomp_scratch_want) { + struct scomp_scratch *scratch; + + scratch = per_cpu_ptr(&scomp_scratch, cpu); + if (context_unsafe(scratch->src)) + continue; + if (scomp_alloc_scratch(scratch, cpu)) + break; + + cpumask_clear_cpu(cpu, &scomp_scratch_want); + } +} + +static int crypto_scomp_alloc_scratches(void) + __context_unsafe(/* allocates @scratch */) +{ + unsigned int i = cpumask_first(cpu_possible_mask); + struct scomp_scratch *scratch; + + scratch = per_cpu_ptr(&scomp_scratch, i); + return scomp_alloc_scratch(scratch, i); +} + +static int crypto_scomp_init_tfm(struct crypto_tfm *tfm) +{ + struct scomp_alg *alg = crypto_scomp_alg(__crypto_scomp_tfm(tfm)); + int ret = 0; + + mutex_lock(&scomp_lock); + ret = crypto_acomp_alloc_streams(&alg->streams); + if (ret) + goto unlock; + if (!scomp_scratch_users++) { + ret = crypto_scomp_alloc_scratches(); + if (ret) + scomp_scratch_users--; + } +unlock: + mutex_unlock(&scomp_lock); + + return ret; +} + +#define scomp_lock_scratch(...) __acquire_ret(_scomp_lock_scratch(__VA_ARGS__), &__ret->lock) +static struct scomp_scratch *_scomp_lock_scratch(void) __acquires_ret +{ + int cpu = raw_smp_processor_id(); + struct scomp_scratch *scratch; + + scratch = per_cpu_ptr(&scomp_scratch, cpu); + spin_lock(&scratch->lock); + if (likely(scratch->src)) + return scratch; + spin_unlock(&scratch->lock); + + cpumask_set_cpu(cpu, &scomp_scratch_want); + schedule_work(&scomp_scratch_work); + + scratch = per_cpu_ptr(&scomp_scratch, cpumask_first(cpu_possible_mask)); + spin_lock(&scratch->lock); + return scratch; +} + +static inline void scomp_unlock_scratch(struct scomp_scratch *scratch) + __releases(&scratch->lock) +{ + spin_unlock(&scratch->lock); +} + +static int scomp_acomp_comp_decomp(struct acomp_req *req, int dir) +{ + struct crypto_acomp *tfm = crypto_acomp_reqtfm(req); + struct crypto_scomp **tfm_ctx = acomp_tfm_ctx(tfm); + bool src_isvirt = acomp_request_src_isvirt(req); + bool dst_isvirt = acomp_request_dst_isvirt(req); + struct crypto_scomp *scomp = *tfm_ctx; + unsigned int slen = req->slen; + unsigned int dlen = req->dlen; + struct page *spage, *dpage; + unsigned int n; + const u8 *src; + size_t soff; + size_t doff; + u8 *dst; + int ret; + + if (!req->src || !slen) + return -EINVAL; + + if (!req->dst || !dlen) + return -EINVAL; + + if (dst_isvirt) + dst = req->dvirt; + else { + if (dlen <= req->dst->length) { + dpage = sg_page(req->dst); + doff = req->dst->offset; + } else + return -ENOSYS; + + dpage += doff / PAGE_SIZE; + doff = offset_in_page(doff); + + n = (dlen - 1) / PAGE_SIZE; + n += (offset_in_page(dlen - 1) + doff) / PAGE_SIZE; + if (PageHighMem(dpage + n) && + size_add(doff, dlen) > PAGE_SIZE) + return -ENOSYS; + dst = kmap_local_page(dpage) + doff; + } + + if (src_isvirt) + src = req->svirt; + else { + src = NULL; + do { + if (slen <= req->src->length) { + spage = sg_page(req->src); + soff = req->src->offset; + } else + break; + + spage = spage + soff / PAGE_SIZE; + soff = offset_in_page(soff); + + n = (slen - 1) / PAGE_SIZE; + n += (offset_in_page(slen - 1) + soff) / PAGE_SIZE; + if (PageHighMem(spage + n) && + size_add(soff, slen) > PAGE_SIZE) + break; + src = kmap_local_page(spage) + soff; + } while (0); + } + + struct crypto_acomp_stream *stream = crypto_acomp_lock_stream_bh(&crypto_scomp_alg(scomp)->streams); + + if (!src_isvirt && !src) { + struct scomp_scratch *scratch = scomp_lock_scratch(); + const u8 *src = scratch->src; + + memcpy_from_sglist(scratch->src, req->src, 0, slen); + + if (dir) + ret = crypto_scomp_compress(scomp, src, slen, + dst, &dlen, stream->ctx); + else + ret = crypto_scomp_decompress(scomp, src, slen, + dst, &dlen, stream->ctx); + + scomp_unlock_scratch(scratch); + } else if (dir) + ret = crypto_scomp_compress(scomp, src, slen, + dst, &dlen, stream->ctx); + else + ret = crypto_scomp_decompress(scomp, src, slen, + dst, &dlen, stream->ctx); + + crypto_acomp_unlock_stream_bh(stream); + + req->dlen = dlen; + + if (!src_isvirt && src) + kunmap_local(src); + if (!dst_isvirt) { + kunmap_local(dst); + dlen += doff; + for (;;) { + flush_dcache_page(dpage); + if (dlen <= PAGE_SIZE) + break; + dlen -= PAGE_SIZE; + dpage++; + } + } + + return ret; +} + +static int scomp_acomp_compress(struct acomp_req *req) +{ + return scomp_acomp_comp_decomp(req, 1); +} + +static int scomp_acomp_decompress(struct acomp_req *req) +{ + return scomp_acomp_comp_decomp(req, 0); +} + +static void crypto_exit_scomp_ops_async(struct crypto_tfm *tfm) +{ + struct crypto_scomp **ctx = crypto_tfm_ctx(tfm); + + crypto_free_scomp(*ctx); + + flush_work(&scomp_scratch_work); + mutex_lock(&scomp_lock); + if (!--scomp_scratch_users) + crypto_scomp_free_scratches(); + mutex_unlock(&scomp_lock); +} + +int crypto_init_scomp_ops_async(struct crypto_tfm *tfm) +{ + struct crypto_alg *calg = tfm->__crt_alg; + struct crypto_acomp *crt = __crypto_acomp_tfm(tfm); + struct crypto_scomp **ctx = crypto_tfm_ctx(tfm); + struct crypto_scomp *scomp; + + if (!crypto_mod_get(calg)) + return -EAGAIN; + + scomp = crypto_create_tfm(calg, &crypto_scomp_type); + if (IS_ERR(scomp)) { + crypto_mod_put(calg); + return PTR_ERR(scomp); + } + + *ctx = scomp; + tfm->exit = crypto_exit_scomp_ops_async; + + crt->compress = scomp_acomp_compress; + crt->decompress = scomp_acomp_decompress; + + return 0; +} + +static void crypto_scomp_destroy(struct crypto_alg *alg) +{ + struct scomp_alg *scomp = __crypto_scomp_alg(alg); + + crypto_acomp_free_streams(&scomp->streams); +} + +static const struct crypto_type crypto_scomp_type = { + .extsize = crypto_alg_extsize, + .init_tfm = crypto_scomp_init_tfm, + .destroy = crypto_scomp_destroy, +#ifdef CONFIG_PROC_FS + .show = crypto_scomp_show, +#endif +#if IS_ENABLED(CONFIG_CRYPTO_USER) + .report = crypto_scomp_report, +#endif + .maskclear = ~CRYPTO_ALG_TYPE_MASK, + .maskset = CRYPTO_ALG_TYPE_MASK, + .type = CRYPTO_ALG_TYPE_SCOMPRESS, + .tfmsize = offsetof(struct crypto_scomp, base), + .algsize = offsetof(struct scomp_alg, base), +}; + +static void scomp_prepare_alg(struct scomp_alg *alg) +{ + struct crypto_alg *base = &alg->calg.base; + + comp_prepare_alg(&alg->calg); + + base->cra_flags |= CRYPTO_ALG_REQ_VIRT; +} + +int crypto_register_scomp(struct scomp_alg *alg) +{ + struct crypto_alg *base = &alg->calg.base; + + scomp_prepare_alg(alg); + + base->cra_type = &crypto_scomp_type; + base->cra_flags |= CRYPTO_ALG_TYPE_SCOMPRESS; + + return crypto_register_alg(base); +} +EXPORT_SYMBOL_GPL(crypto_register_scomp); + +void crypto_unregister_scomp(struct scomp_alg *alg) +{ + crypto_unregister_alg(&alg->base); +} +EXPORT_SYMBOL_GPL(crypto_unregister_scomp); + +int crypto_register_scomps(struct scomp_alg *algs, int count) +{ + int i, ret; + + for (i = 0; i < count; i++) { + ret = crypto_register_scomp(&algs[i]); + if (ret) { + crypto_unregister_scomps(algs, i); + return ret; + } + } + + return 0; +} +EXPORT_SYMBOL_GPL(crypto_register_scomps); + +void crypto_unregister_scomps(struct scomp_alg *algs, int count) +{ + int i; + + for (i = count - 1; i >= 0; --i) + crypto_unregister_scomp(&algs[i]); +} +EXPORT_SYMBOL_GPL(crypto_unregister_scomps); + +MODULE_LICENSE("GPL"); +MODULE_DESCRIPTION("Synchronous compression type"); -- cgit v1.3.1