Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   2) /* bounce buffer handling for block devices
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   3)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4)  * - Split from highmem.c
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7) #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9) #include <linux/mm.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10) #include <linux/export.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11) #include <linux/swap.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) #include <linux/bio.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14) #include <linux/pagemap.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15) #include <linux/mempool.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) #include <linux/blkdev.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) #include <linux/backing-dev.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18) #include <linux/init.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19) #include <linux/hash.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20) #include <linux/highmem.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21) #include <linux/memblock.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22) #include <linux/printk.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23) #include <asm/tlbflush.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25) #include <trace/events/block.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26) #include "blk.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) #define POOL_SIZE	64
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) #define ISA_POOL_SIZE	16
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) static struct bio_set bounce_bio_set, bounce_bio_split;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) static mempool_t page_pool, isa_page_pool;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) static void init_bounce_bioset(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) 	static bool bounce_bs_setup;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) 	int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) 	if (bounce_bs_setup)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) 		return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) 	ret = bioset_init(&bounce_bio_set, BIO_POOL_SIZE, 0, BIOSET_NEED_BVECS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) 	BUG_ON(ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) 	if (bioset_integrity_create(&bounce_bio_set, BIO_POOL_SIZE))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) 		BUG_ON(1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) 	ret = bioset_init(&bounce_bio_split, BIO_POOL_SIZE, 0, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) 	BUG_ON(ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) 	bounce_bs_setup = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) #if defined(CONFIG_HIGHMEM)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) static __init int init_emergency_pool(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) 	int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) #if defined(CONFIG_HIGHMEM) && !defined(CONFIG_MEMORY_HOTPLUG)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) 	if (max_pfn <= max_low_pfn)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) 		return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) 	ret = mempool_init_page_pool(&page_pool, POOL_SIZE, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) 	BUG_ON(ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) 	pr_info("pool size: %d pages\n", POOL_SIZE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) 	init_bounce_bioset();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) __initcall(init_emergency_pool);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) #ifdef CONFIG_HIGHMEM
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74)  * highmem version, map in to vec
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) static void bounce_copy_vec(struct bio_vec *to, unsigned char *vfrom)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) 	unsigned char *vto;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) 	vto = kmap_atomic(to->bv_page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) 	memcpy(vto + to->bv_offset, vfrom, to->bv_len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) 	kunmap_atomic(vto);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) #else /* CONFIG_HIGHMEM */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) #define bounce_copy_vec(to, vfrom)	\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) 	memcpy(page_address((to)->bv_page) + (to)->bv_offset, vfrom, (to)->bv_len)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) #endif /* CONFIG_HIGHMEM */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93)  * allocate pages in the DMA region for the ISA pool
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) static void *mempool_alloc_pages_isa(gfp_t gfp_mask, void *data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) 	return mempool_alloc_pages(gfp_mask | GFP_DMA, data);
^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) static DEFINE_MUTEX(isa_mutex);
^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)  * gets called "every" time someone init's a queue with BLK_BOUNCE_ISA
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104)  * as the max address, so check if the pool has already been created.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) int init_emergency_isa_pool(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) 	int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) 	mutex_lock(&isa_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) 	if (mempool_initialized(&isa_page_pool)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) 		mutex_unlock(&isa_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) 		return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) 	ret = mempool_init(&isa_page_pool, ISA_POOL_SIZE, mempool_alloc_pages_isa,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) 			   mempool_free_pages, (void *) 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) 	BUG_ON(ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) 	pr_info("isa pool size: %d pages\n", ISA_POOL_SIZE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) 	init_bounce_bioset();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) 	mutex_unlock(&isa_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128)  * Simple bounce buffer support for highmem pages. Depending on the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129)  * queue gfp mask set, *to may or may not be a highmem page. kmap it
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130)  * always, it will do the Right Thing
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) static void copy_to_high_bio_irq(struct bio *to, struct bio *from)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) 	unsigned char *vfrom;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) 	struct bio_vec tovec, fromvec;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) 	struct bvec_iter iter;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) 	 * The bio of @from is created by bounce, so we can iterate
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) 	 * its bvec from start to end, but the @from->bi_iter can't be
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) 	 * trusted because it might be changed by splitting.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) 	struct bvec_iter from_iter = BVEC_ITER_ALL_INIT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) 	bio_for_each_segment(tovec, to, iter) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) 		fromvec = bio_iter_iovec(from, from_iter);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) 		if (tovec.bv_page != fromvec.bv_page) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) 			/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) 			 * fromvec->bv_offset and fromvec->bv_len might have
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) 			 * been modified by the block layer, so use the original
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) 			 * copy, bounce_copy_vec already uses tovec->bv_len
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) 			 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) 			vfrom = page_address(fromvec.bv_page) +
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) 				tovec.bv_offset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) 			bounce_copy_vec(&tovec, vfrom);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) 			flush_dcache_page(tovec.bv_page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) 		bio_advance_iter(from, &from_iter, tovec.bv_len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) static void bounce_end_io(struct bio *bio, mempool_t *pool)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) 	struct bio *bio_orig = bio->bi_private;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) 	struct bio_vec *bvec, orig_vec;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) 	struct bvec_iter orig_iter = bio_orig->bi_iter;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) 	struct bvec_iter_all iter_all;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) 	 * free up bounce indirect pages used
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) 	bio_for_each_segment_all(bvec, bio, iter_all) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) 		orig_vec = bio_iter_iovec(bio_orig, orig_iter);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) 		if (bvec->bv_page != orig_vec.bv_page) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) 			dec_zone_page_state(bvec->bv_page, NR_BOUNCE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) 			mempool_free(bvec->bv_page, pool);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) 		bio_advance_iter(bio_orig, &orig_iter, orig_vec.bv_len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) 	bio_orig->bi_status = bio->bi_status;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) 	bio_endio(bio_orig);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) 	bio_put(bio);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) static void bounce_end_io_write(struct bio *bio)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) 	bounce_end_io(bio, &page_pool);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) static void bounce_end_io_write_isa(struct bio *bio)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) 	bounce_end_io(bio, &isa_page_pool);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) static void __bounce_end_io_read(struct bio *bio, mempool_t *pool)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) 	struct bio *bio_orig = bio->bi_private;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) 	if (!bio->bi_status)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) 		copy_to_high_bio_irq(bio_orig, bio);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) 	bounce_end_io(bio, pool);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) static void bounce_end_io_read(struct bio *bio)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) 	__bounce_end_io_read(bio, &page_pool);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) static void bounce_end_io_read_isa(struct bio *bio)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) 	__bounce_end_io_read(bio, &isa_page_pool);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) static struct bio *bounce_clone_bio(struct bio *bio_src, gfp_t gfp_mask,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) 		struct bio_set *bs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) 	struct bvec_iter iter;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) 	struct bio_vec bv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) 	struct bio *bio;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) 	 * Pre immutable biovecs, __bio_clone() used to just do a memcpy from
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) 	 * bio_src->bi_io_vec to bio->bi_io_vec.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) 	 *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) 	 * We can't do that anymore, because:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) 	 *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) 	 *  - The point of cloning the biovec is to produce a bio with a biovec
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) 	 *    the caller can modify: bi_idx and bi_bvec_done should be 0.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) 	 *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) 	 *  - The original bio could've had more than BIO_MAX_PAGES biovecs; if
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) 	 *    we tried to clone the whole thing bio_alloc_bioset() would fail.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) 	 *    But the clone should succeed as long as the number of biovecs we
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) 	 *    actually need to allocate is fewer than BIO_MAX_PAGES.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) 	 *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) 	 *  - Lastly, bi_vcnt should not be looked at or relied upon by code
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) 	 *    that does not own the bio - reason being drivers don't use it for
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) 	 *    iterating over the biovec anymore, so expecting it to be kept up
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) 	 *    to date (i.e. for clones that share the parent biovec) is just
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) 	 *    asking for trouble and would force extra work on
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) 	 *    __bio_clone_fast() anyways.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) 	bio = bio_alloc_bioset(gfp_mask, bio_segments(bio_src), bs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) 	if (!bio)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) 		return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) 	bio->bi_disk		= bio_src->bi_disk;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) 	bio->bi_opf		= bio_src->bi_opf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) 	bio->bi_ioprio		= bio_src->bi_ioprio;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) 	bio->bi_write_hint	= bio_src->bi_write_hint;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) 	bio->bi_iter.bi_sector	= bio_src->bi_iter.bi_sector;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) 	bio->bi_iter.bi_size	= bio_src->bi_iter.bi_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) 	switch (bio_op(bio)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) 	case REQ_OP_DISCARD:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) 	case REQ_OP_SECURE_ERASE:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) 	case REQ_OP_WRITE_ZEROES:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) 	case REQ_OP_WRITE_SAME:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) 		bio->bi_io_vec[bio->bi_vcnt++] = bio_src->bi_io_vec[0];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) 	default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) 		bio_for_each_segment(bv, bio_src, iter)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) 			bio->bi_io_vec[bio->bi_vcnt++] = bv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) 	if (bio_crypt_clone(bio, bio_src, gfp_mask) < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) 		goto err_put;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) 	if (bio_integrity(bio_src) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) 	    bio_integrity_clone(bio, bio_src, gfp_mask) < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) 		goto err_put;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) 	bio_clone_blkg_association(bio, bio_src);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) 	blkcg_bio_issue_init(bio);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) 	return bio;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) err_put:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) 	bio_put(bio);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) 	return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) static void __blk_queue_bounce(struct request_queue *q, struct bio **bio_orig,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) 			       mempool_t *pool)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) 	struct bio *bio;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) 	int rw = bio_data_dir(*bio_orig);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) 	struct bio_vec *to, from;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) 	struct bvec_iter iter;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) 	unsigned i = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) 	bool bounce = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) 	int sectors = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) 	bool passthrough = bio_is_passthrough(*bio_orig);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) 	bio_for_each_segment(from, *bio_orig, iter) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) 		if (i++ < BIO_MAX_PAGES)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) 			sectors += from.bv_len >> 9;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) 		if (page_to_pfn(from.bv_page) > q->limits.bounce_pfn)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) 			bounce = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) 	if (!bounce)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) 		return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) 	if (!passthrough && sectors < bio_sectors(*bio_orig)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) 		bio = bio_split(*bio_orig, sectors, GFP_NOIO, &bounce_bio_split);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) 		bio_chain(bio, *bio_orig);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) 		submit_bio_noacct(*bio_orig);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) 		*bio_orig = bio;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) 	bio = bounce_clone_bio(*bio_orig, GFP_NOIO, passthrough ? NULL :
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) 			&bounce_bio_set);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) 	 * Bvec table can't be updated by bio_for_each_segment_all(),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) 	 * so retrieve bvec from the table directly. This way is safe
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) 	 * because the 'bio' is single-page bvec.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) 	for (i = 0, to = bio->bi_io_vec; i < bio->bi_vcnt; to++, i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) 		struct page *page = to->bv_page;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) 		if (page_to_pfn(page) <= q->limits.bounce_pfn)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) 			continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) 		to->bv_page = mempool_alloc(pool, q->bounce_gfp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) 		inc_zone_page_state(to->bv_page, NR_BOUNCE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) 		if (rw == WRITE) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) 			char *vto, *vfrom;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) 			flush_dcache_page(page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) 			vto = page_address(to->bv_page) + to->bv_offset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) 			vfrom = kmap_atomic(page) + to->bv_offset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) 			memcpy(vto, vfrom, to->bv_len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) 			kunmap_atomic(vfrom);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) 	trace_block_bio_bounce(q, *bio_orig);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) 	bio->bi_flags |= (1 << BIO_BOUNCED);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) 	if (pool == &page_pool) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) 		bio->bi_end_io = bounce_end_io_write;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) 		if (rw == READ)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) 			bio->bi_end_io = bounce_end_io_read;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) 	} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) 		bio->bi_end_io = bounce_end_io_write_isa;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) 		if (rw == READ)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) 			bio->bi_end_io = bounce_end_io_read_isa;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) 	bio->bi_private = *bio_orig;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) 	*bio_orig = bio;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) void blk_queue_bounce(struct request_queue *q, struct bio **bio_orig)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) 	mempool_t *pool;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) 	 * Data-less bio, nothing to bounce
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) 	if (!bio_has_data(*bio_orig))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) 		return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372) 	 * for non-isa bounce case, just check if the bounce pfn is equal
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) 	 * to or bigger than the highest pfn in the system -- in that case,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) 	 * don't waste time iterating over bio segments
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376) 	if (!(q->bounce_gfp & GFP_DMA)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) 		if (q->limits.bounce_pfn >= blk_max_pfn)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) 			return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) 		pool = &page_pool;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) 	} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381) 		BUG_ON(!mempool_initialized(&isa_page_pool));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382) 		pool = &isa_page_pool;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386) 	 * slow path
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388) 	__blk_queue_bounce(q, bio_orig, pool);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389) }