From 119e9db233ad0f4cbd4cfb9f9385a7bca378b37d Mon Sep 17 00:00:00 2001 From: Zeng Chi Date: Mon, 21 Sep 2026 18:24:42 +0800 Subject: KVM: Don't pre-reserve xarray entries when storing empty/NULL attributes Skip the xarray reservation loop when clearing all memory attributes, as storing NULL only erases the entry and never needs to allocate, so no reservation (and no cleanup of a failed one) is required in that case. Suggested-by: Sean Christopherson Cc: David Ballesteros Signed-off-by: Zeng Chi Link: https://patch.msgid.link/20260921102442.1232375-1-zeng_chi911@163.com [sean: split to separate patch] Signed-off-by: Sean Christopherson --- drivers/crypto/omap-crypto.c | 225 +++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 225 insertions(+) create mode 100644 drivers/crypto/omap-crypto.c (limited to 'drivers/crypto/omap-crypto.c') diff --git a/drivers/crypto/omap-crypto.c b/drivers/crypto/omap-crypto.c new file mode 100644 index 000000000..7bd6869c2 --- /dev/null +++ b/drivers/crypto/omap-crypto.c @@ -0,0 +1,225 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * OMAP Crypto driver common support routines. + * + * Copyright (c) 2017 Texas Instruments Incorporated + * Tero Kristo + */ + +#include +#include +#include +#include + +#include "omap-crypto.h" + +static int omap_crypto_copy_sg_lists(int total, int bs, + struct scatterlist **sg, + struct scatterlist *new_sg, u16 flags) +{ + int n = sg_nents(*sg); + struct scatterlist *tmp; + + if (!(flags & OMAP_CRYPTO_FORCE_SINGLE_ENTRY)) { + new_sg = kmalloc_objs(*new_sg, n); + if (!new_sg) + return -ENOMEM; + + sg_init_table(new_sg, n); + } + + tmp = new_sg; + + while (*sg && total) { + int len = (*sg)->length; + + if (total < len) + len = total; + + if (len > 0) { + total -= len; + sg_set_page(tmp, sg_page(*sg), len, (*sg)->offset); + if (total <= 0) + sg_mark_end(tmp); + tmp = sg_next(tmp); + } + + *sg = sg_next(*sg); + } + + *sg = new_sg; + + return 0; +} + +static int omap_crypto_copy_sgs(int total, int bs, struct scatterlist **sg, + struct scatterlist *new_sg, u16 flags) +{ + void *buf; + int pages; + int new_len; + + new_len = ALIGN(total, bs); + pages = get_order(new_len); + + buf = (void *)__get_free_pages(GFP_ATOMIC, pages); + if (!buf) { + pr_err("%s: Couldn't allocate pages for unaligned cases.\n", + __func__); + return -ENOMEM; + } + + if (flags & OMAP_CRYPTO_COPY_DATA) { + scatterwalk_map_and_copy(buf, *sg, 0, total, 0); + if (flags & OMAP_CRYPTO_ZERO_BUF) + memset(buf + total, 0, new_len - total); + } + + if (!(flags & OMAP_CRYPTO_FORCE_SINGLE_ENTRY)) + sg_init_table(new_sg, 1); + + sg_set_buf(new_sg, buf, new_len); + + *sg = new_sg; + + return 0; +} + +static int omap_crypto_check_sg(struct scatterlist *sg, int total, int bs, + u16 flags) +{ + int len = 0; + int num_sg = 0; + + if (!IS_ALIGNED(total, bs)) + return OMAP_CRYPTO_NOT_ALIGNED; + + while (sg) { + num_sg++; + + if (!IS_ALIGNED(sg->offset, 4)) + return OMAP_CRYPTO_NOT_ALIGNED; + if (!IS_ALIGNED(sg->length, bs)) + return OMAP_CRYPTO_NOT_ALIGNED; +#ifdef CONFIG_ZONE_DMA + if (page_zonenum(sg_page(sg)) != ZONE_DMA) + return OMAP_CRYPTO_NOT_ALIGNED; +#endif + + len += sg->length; + sg = sg_next(sg); + + if (len >= total) + break; + } + + if ((flags & OMAP_CRYPTO_FORCE_SINGLE_ENTRY) && num_sg > 1) + return OMAP_CRYPTO_NOT_ALIGNED; + + if (len != total) + return OMAP_CRYPTO_BAD_DATA_LENGTH; + + return 0; +} + +int omap_crypto_align_sg(struct scatterlist **sg, int total, int bs, + struct scatterlist *new_sg, u16 flags, + u8 flags_shift, unsigned long *dd_flags) +{ + int ret; + + *dd_flags &= ~(OMAP_CRYPTO_COPY_MASK << flags_shift); + + if (flags & OMAP_CRYPTO_FORCE_COPY) + ret = OMAP_CRYPTO_NOT_ALIGNED; + else + ret = omap_crypto_check_sg(*sg, total, bs, flags); + + if (ret == OMAP_CRYPTO_NOT_ALIGNED) { + ret = omap_crypto_copy_sgs(total, bs, sg, new_sg, flags); + if (ret) + return ret; + *dd_flags |= OMAP_CRYPTO_DATA_COPIED << flags_shift; + } else if (ret == OMAP_CRYPTO_BAD_DATA_LENGTH) { + ret = omap_crypto_copy_sg_lists(total, bs, sg, new_sg, flags); + if (ret) + return ret; + if (!(flags & OMAP_CRYPTO_FORCE_SINGLE_ENTRY)) + *dd_flags |= OMAP_CRYPTO_SG_COPIED << flags_shift; + } else if (flags & OMAP_CRYPTO_FORCE_SINGLE_ENTRY) { + sg_set_buf(new_sg, sg_virt(*sg), (*sg)->length); + } + + return 0; +} +EXPORT_SYMBOL_GPL(omap_crypto_align_sg); + +static void omap_crypto_copy_data(struct scatterlist *src, + struct scatterlist *dst, + int offset, int len) +{ + int amt; + void *srcb, *dstb; + int srco = 0, dsto = offset; + + while (src && dst && len) { + if (srco >= src->length) { + srco -= src->length; + src = sg_next(src); + continue; + } + + if (dsto >= dst->length) { + dsto -= dst->length; + dst = sg_next(dst); + continue; + } + + amt = min(src->length - srco, dst->length - dsto); + amt = min(len, amt); + + srcb = kmap_atomic(sg_page(src)) + srco + src->offset; + dstb = kmap_atomic(sg_page(dst)) + dsto + dst->offset; + + memcpy(dstb, srcb, amt); + + flush_dcache_page(sg_page(dst)); + + kunmap_atomic(srcb); + kunmap_atomic(dstb); + + srco += amt; + dsto += amt; + len -= amt; + } +} + +void omap_crypto_cleanup(struct scatterlist *sg, struct scatterlist *orig, + int offset, int len, u8 flags_shift, + unsigned long flags) +{ + void *buf; + int pages; + + flags >>= flags_shift; + flags &= OMAP_CRYPTO_COPY_MASK; + + if (!flags) + return; + + buf = sg_virt(sg); + pages = get_order(len); + + if (orig && (flags & OMAP_CRYPTO_DATA_COPIED)) + omap_crypto_copy_data(sg, orig, offset, len); + + if (flags & OMAP_CRYPTO_DATA_COPIED) + free_pages((unsigned long)buf, pages); + else if (flags & OMAP_CRYPTO_SG_COPIED) + kfree(sg); +} +EXPORT_SYMBOL_GPL(omap_crypto_cleanup); + +MODULE_DESCRIPTION("OMAP crypto support library."); +MODULE_LICENSE("GPL v2"); +MODULE_AUTHOR("Tero Kristo "); -- cgit v1.3.1