^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0-or-later
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * Copyright(c) 2007 Yuri Tikhonov <yur@emcraft.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) * Copyright(c) 2009 Intel Corporation
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) #include <linux/interrupt.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) #include <linux/dma-mapping.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <linux/raid/pq.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/async_tx.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/gfp.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) * pq_scribble_page - space to hold throwaway P or Q buffer for
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) * synchronous gen_syndrome
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) static struct page *pq_scribble_page;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) /* the struct page *blocks[] parameter passed to async_gen_syndrome()
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) * and async_syndrome_val() contains the 'P' destination address at
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) * blocks[disks-2] and the 'Q' destination address at blocks[disks-1]
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) * note: these are macros as they are used as lvalues
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) #define P(b, d) (b[d-2])
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) #define Q(b, d) (b[d-1])
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) #define MAX_DISKS 255
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) * do_async_gen_syndrome - asynchronously calculate P and/or Q
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) static __async_inline struct dma_async_tx_descriptor *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) do_async_gen_syndrome(struct dma_chan *chan,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) const unsigned char *scfs, int disks,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) struct dmaengine_unmap_data *unmap,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) enum dma_ctrl_flags dma_flags,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) struct async_submit_ctl *submit)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) struct dma_async_tx_descriptor *tx = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) struct dma_device *dma = chan->device;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) enum async_tx_flags flags_orig = submit->flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) dma_async_tx_callback cb_fn_orig = submit->cb_fn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) dma_async_tx_callback cb_param_orig = submit->cb_param;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) int src_cnt = disks - 2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) unsigned short pq_src_cnt;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) dma_addr_t dma_dest[2];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) int src_off = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) while (src_cnt > 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) submit->flags = flags_orig;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) pq_src_cnt = min(src_cnt, dma_maxpq(dma, dma_flags));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) /* if we are submitting additional pqs, leave the chain open,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) * clear the callback parameters, and leave the destination
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) * buffers mapped
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) if (src_cnt > pq_src_cnt) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) submit->flags &= ~ASYNC_TX_ACK;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) submit->flags |= ASYNC_TX_FENCE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) submit->cb_fn = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) submit->cb_param = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) submit->cb_fn = cb_fn_orig;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) submit->cb_param = cb_param_orig;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) if (cb_fn_orig)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) dma_flags |= DMA_PREP_INTERRUPT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) if (submit->flags & ASYNC_TX_FENCE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) dma_flags |= DMA_PREP_FENCE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) /* Drivers force forward progress in case they can not provide
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) * a descriptor
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) for (;;) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) dma_dest[0] = unmap->addr[disks - 2];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) dma_dest[1] = unmap->addr[disks - 1];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) tx = dma->device_prep_dma_pq(chan, dma_dest,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) &unmap->addr[src_off],
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) pq_src_cnt,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) &scfs[src_off], unmap->len,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) dma_flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) if (likely(tx))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) async_tx_quiesce(&submit->depend_tx);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) dma_async_issue_pending(chan);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) dma_set_unmap(tx, unmap);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) async_tx_submit(chan, tx, submit);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) submit->depend_tx = tx;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) /* drop completed sources */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) src_cnt -= pq_src_cnt;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) src_off += pq_src_cnt;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) dma_flags |= DMA_PREP_CONTINUE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) return tx;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) * do_sync_gen_syndrome - synchronously calculate a raid6 syndrome
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) static void
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) do_sync_gen_syndrome(struct page **blocks, unsigned int *offsets, int disks,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) size_t len, struct async_submit_ctl *submit)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) void **srcs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) int start = -1, stop = disks - 3;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) if (submit->scribble)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) srcs = submit->scribble;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) srcs = (void **) blocks;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) for (i = 0; i < disks; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) if (blocks[i] == NULL) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) BUG_ON(i > disks - 3); /* P or Q can't be zero */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) srcs[i] = (void*)raid6_empty_zero_page;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) srcs[i] = page_address(blocks[i]) + offsets[i];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) if (i < disks - 2) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) stop = i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) if (start == -1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) start = i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) if (submit->flags & ASYNC_TX_PQ_XOR_DST) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) BUG_ON(!raid6_call.xor_syndrome);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) if (start >= 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) raid6_call.xor_syndrome(disks, start, stop, len, srcs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) } else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) raid6_call.gen_syndrome(disks, len, srcs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) async_tx_sync_epilog(submit);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) static inline bool
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) is_dma_pq_aligned_offs(struct dma_device *dev, unsigned int *offs,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) int src_cnt, size_t len)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) for (i = 0; i < src_cnt; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) if (!is_dma_pq_aligned(dev, offs[i], 0, len))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) return false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) return true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) * async_gen_syndrome - asynchronously calculate a raid6 syndrome
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) * @blocks: source blocks from idx 0..disks-3, P @ disks-2 and Q @ disks-1
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) * @offsets: offset array into each block (src and dest) to start transaction
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) * @disks: number of blocks (including missing P or Q, see below)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) * @len: length of operation in bytes
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) * @submit: submission/completion modifiers
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) * General note: This routine assumes a field of GF(2^8) with a
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) * primitive polynomial of 0x11d and a generator of {02}.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) * 'disks' note: callers can optionally omit either P or Q (but not
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) * both) from the calculation by setting blocks[disks-2] or
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) * blocks[disks-1] to NULL. When P or Q is omitted 'len' must be <=
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) * PAGE_SIZE as a temporary buffer of this size is used in the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) * synchronous path. 'disks' always accounts for both destination
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) * buffers. If any source buffers (blocks[i] where i < disks - 2) are
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) * set to NULL those buffers will be replaced with the raid6_zero_page
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) * in the synchronous path and omitted in the hardware-asynchronous
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) * path.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) struct dma_async_tx_descriptor *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) async_gen_syndrome(struct page **blocks, unsigned int *offsets, int disks,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) size_t len, struct async_submit_ctl *submit)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) int src_cnt = disks - 2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) struct dma_chan *chan = async_tx_find_channel(submit, DMA_PQ,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) &P(blocks, disks), 2,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) blocks, src_cnt, len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) struct dma_device *device = chan ? chan->device : NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) struct dmaengine_unmap_data *unmap = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) BUG_ON(disks > MAX_DISKS || !(P(blocks, disks) || Q(blocks, disks)));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) if (device)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) unmap = dmaengine_get_unmap_data(device->dev, disks, GFP_NOWAIT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) /* XORing P/Q is only implemented in software */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) if (unmap && !(submit->flags & ASYNC_TX_PQ_XOR_DST) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) (src_cnt <= dma_maxpq(device, 0) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) dma_maxpq(device, DMA_PREP_CONTINUE) > 0) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) is_dma_pq_aligned_offs(device, offsets, disks, len)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) struct dma_async_tx_descriptor *tx;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) enum dma_ctrl_flags dma_flags = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) unsigned char coefs[MAX_DISKS];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) int i, j;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) /* run the p+q asynchronously */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) pr_debug("%s: (async) disks: %d len: %zu\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) __func__, disks, len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) /* convert source addresses being careful to collapse 'empty'
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) * sources and update the coefficients accordingly
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) unmap->len = len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) for (i = 0, j = 0; i < src_cnt; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) if (blocks[i] == NULL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) unmap->addr[j] = dma_map_page(device->dev, blocks[i],
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) offsets[i], len, DMA_TO_DEVICE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) coefs[j] = raid6_gfexp[i];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) unmap->to_cnt++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) j++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) * DMAs use destinations as sources,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) * so use BIDIRECTIONAL mapping
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) unmap->bidi_cnt++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) if (P(blocks, disks))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) unmap->addr[j++] = dma_map_page(device->dev, P(blocks, disks),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) P(offsets, disks),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) len, DMA_BIDIRECTIONAL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) unmap->addr[j++] = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) dma_flags |= DMA_PREP_PQ_DISABLE_P;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) unmap->bidi_cnt++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) if (Q(blocks, disks))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) unmap->addr[j++] = dma_map_page(device->dev, Q(blocks, disks),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) Q(offsets, disks),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) len, DMA_BIDIRECTIONAL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) unmap->addr[j++] = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) dma_flags |= DMA_PREP_PQ_DISABLE_Q;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) tx = do_async_gen_syndrome(chan, coefs, j, unmap, dma_flags, submit);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) dmaengine_unmap_put(unmap);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) return tx;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) dmaengine_unmap_put(unmap);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) /* run the pq synchronously */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) pr_debug("%s: (sync) disks: %d len: %zu\n", __func__, disks, len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) /* wait for any prerequisite operations */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) async_tx_quiesce(&submit->depend_tx);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) if (!P(blocks, disks)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) P(blocks, disks) = pq_scribble_page;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) P(offsets, disks) = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) if (!Q(blocks, disks)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) Q(blocks, disks) = pq_scribble_page;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) Q(offsets, disks) = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) do_sync_gen_syndrome(blocks, offsets, disks, len, submit);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) EXPORT_SYMBOL_GPL(async_gen_syndrome);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) static inline struct dma_chan *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) pq_val_chan(struct async_submit_ctl *submit, struct page **blocks, int disks, size_t len)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) #ifdef CONFIG_ASYNC_TX_DISABLE_PQ_VAL_DMA
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) return async_tx_find_channel(submit, DMA_PQ_VAL, NULL, 0, blocks,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) disks, len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) * async_syndrome_val - asynchronously validate a raid6 syndrome
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) * @blocks: source blocks from idx 0..disks-3, P @ disks-2 and Q @ disks-1
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) * @offset: common offset into each block (src and dest) to start transaction
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) * @disks: number of blocks (including missing P or Q, see below)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) * @len: length of operation in bytes
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) * @pqres: on val failure SUM_CHECK_P_RESULT and/or SUM_CHECK_Q_RESULT are set
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) * @spare: temporary result buffer for the synchronous case
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) * @s_off: spare buffer page offset
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) * @submit: submission / completion modifiers
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) * The same notes from async_gen_syndrome apply to the 'blocks',
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) * and 'disks' parameters of this routine. The synchronous path
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) * requires a temporary result buffer and submit->scribble to be
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) * specified.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) struct dma_async_tx_descriptor *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) async_syndrome_val(struct page **blocks, unsigned int *offsets, int disks,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) size_t len, enum sum_check_flags *pqres, struct page *spare,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) unsigned int s_off, struct async_submit_ctl *submit)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) struct dma_chan *chan = pq_val_chan(submit, blocks, disks, len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) struct dma_device *device = chan ? chan->device : NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) struct dma_async_tx_descriptor *tx;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) unsigned char coefs[MAX_DISKS];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) enum dma_ctrl_flags dma_flags = submit->cb_fn ? DMA_PREP_INTERRUPT : 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) struct dmaengine_unmap_data *unmap = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) BUG_ON(disks < 4 || disks > MAX_DISKS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) if (device)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) unmap = dmaengine_get_unmap_data(device->dev, disks, GFP_NOWAIT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) if (unmap && disks <= dma_maxpq(device, 0) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) is_dma_pq_aligned_offs(device, offsets, disks, len)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) struct device *dev = device->dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) dma_addr_t pq[2];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) int i, j = 0, src_cnt = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) pr_debug("%s: (async) disks: %d len: %zu\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) __func__, disks, len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) unmap->len = len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) for (i = 0; i < disks-2; i++)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) if (likely(blocks[i])) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) unmap->addr[j] = dma_map_page(dev, blocks[i],
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) offsets[i], len,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) DMA_TO_DEVICE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) coefs[j] = raid6_gfexp[i];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) unmap->to_cnt++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) src_cnt++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) j++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) if (!P(blocks, disks)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) pq[0] = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) dma_flags |= DMA_PREP_PQ_DISABLE_P;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) pq[0] = dma_map_page(dev, P(blocks, disks),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) P(offsets, disks), len,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) DMA_TO_DEVICE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) unmap->addr[j++] = pq[0];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) unmap->to_cnt++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) if (!Q(blocks, disks)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) pq[1] = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) dma_flags |= DMA_PREP_PQ_DISABLE_Q;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) pq[1] = dma_map_page(dev, Q(blocks, disks),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) Q(offsets, disks), len,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) DMA_TO_DEVICE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) unmap->addr[j++] = pq[1];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) unmap->to_cnt++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) if (submit->flags & ASYNC_TX_FENCE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) dma_flags |= DMA_PREP_FENCE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) for (;;) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) tx = device->device_prep_dma_pq_val(chan, pq,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) unmap->addr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) src_cnt,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) coefs,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) len, pqres,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) dma_flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) if (likely(tx))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) async_tx_quiesce(&submit->depend_tx);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) dma_async_issue_pending(chan);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) dma_set_unmap(tx, unmap);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372) async_tx_submit(chan, tx, submit);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) struct page *p_src = P(blocks, disks);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) unsigned int p_off = P(offsets, disks);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376) struct page *q_src = Q(blocks, disks);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) unsigned int q_off = Q(offsets, disks);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) enum async_tx_flags flags_orig = submit->flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) dma_async_tx_callback cb_fn_orig = submit->cb_fn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) void *scribble = submit->scribble;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381) void *cb_param_orig = submit->cb_param;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382) void *p, *q, *s;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384) pr_debug("%s: (sync) disks: %d len: %zu\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385) __func__, disks, len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387) /* caller must provide a temporary result buffer and
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388) * allow the input parameters to be preserved
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390) BUG_ON(!spare || !scribble);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392) /* wait for any prerequisite operations */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393) async_tx_quiesce(&submit->depend_tx);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395) /* recompute p and/or q into the temporary buffer and then
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 396) * check to see the result matches the current value
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 397) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 398) tx = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 399) *pqres = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 400) if (p_src) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 401) init_async_submit(submit, ASYNC_TX_XOR_ZERO_DST, NULL,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 402) NULL, NULL, scribble);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 403) tx = async_xor_offs(spare, s_off,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 404) blocks, offsets, disks-2, len, submit);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 405) async_tx_quiesce(&tx);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 406) p = page_address(p_src) + p_off;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 407) s = page_address(spare) + s_off;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 408) *pqres |= !!memcmp(p, s, len) << SUM_CHECK_P;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 409) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 410)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 411) if (q_src) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 412) P(blocks, disks) = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 413) Q(blocks, disks) = spare;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 414) Q(offsets, disks) = s_off;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 415) init_async_submit(submit, 0, NULL, NULL, NULL, scribble);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 416) tx = async_gen_syndrome(blocks, offsets, disks,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 417) len, submit);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 418) async_tx_quiesce(&tx);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 419) q = page_address(q_src) + q_off;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 420) s = page_address(spare) + s_off;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 421) *pqres |= !!memcmp(q, s, len) << SUM_CHECK_Q;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 422) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 423)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 424) /* restore P, Q and submit */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 425) P(blocks, disks) = p_src;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 426) P(offsets, disks) = p_off;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 427) Q(blocks, disks) = q_src;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 428) Q(offsets, disks) = q_off;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 429)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 430) submit->cb_fn = cb_fn_orig;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 431) submit->cb_param = cb_param_orig;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 432) submit->flags = flags_orig;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 433) async_tx_sync_epilog(submit);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 434) tx = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 435) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 436) dmaengine_unmap_put(unmap);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 437)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 438) return tx;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 439) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 440) EXPORT_SYMBOL_GPL(async_syndrome_val);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 441)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 442) static int __init async_pq_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 443) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 444) pq_scribble_page = alloc_page(GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 445)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 446) if (pq_scribble_page)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 447) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 448)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 449) pr_err("%s: failed to allocate required spare page\n", __func__);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 450)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 451) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 452) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 453)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 454) static void __exit async_pq_exit(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 455) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 456) __free_page(pq_scribble_page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 457) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 458)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 459) module_init(async_pq_init);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 460) module_exit(async_pq_exit);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 461)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 462) MODULE_DESCRIPTION("asynchronous raid6 syndrome generation/validation");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 463) MODULE_LICENSE("GPL");
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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