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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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e48aa1eb44
The chipidea controller doesn't support short transfer for sg list, so we still keep setting IOC per TD, otherwise, there will be no interrupt for short transfer. Each TD has five entries for data buffer, each data buffer could be non-countinuous 4KB buffer, so it could handle up to 5 sg buffers one time. The benefit of this patch is avoiding OOM for low memory system(eg, 256MB) during large USB transfers, see below for detail. The non-sg handling has not changed. ufb: page allocation failure: order:4, mode:0x40cc0(GFP_KERNEL|__GFP_COMP), nodemask=(null),cpuset=/,mems_allowed=0 CPU: 2 PID: 370 Comm: ufb Not tainted 5.4.3-1.1.0+g54b3750d61fd #1 Hardware name: NXP i.MX8MNano DDR4 EVK board (DT) Call trace: dump_backtrace+0x0/0x140 show_stack+0x14/0x20 dump_stack+0xb4/0xf8 warn_alloc+0xec/0x158 __alloc_pages_slowpath+0x9cc/0x9f8 __alloc_pages_nodemask+0x21c/0x280 alloc_pages_current+0x7c/0xe8 kmalloc_order+0x1c/0x88 __kmalloc+0x25c/0x298 ffs_epfile_io.isra.0+0x20c/0x7d0 ffs_epfile_read_iter+0xa8/0x188 new_sync_read+0xe4/0x170 __vfs_read+0x2c/0x40 vfs_read+0xc8/0x1a0 ksys_read+0x68/0xf0 __arm64_sys_read+0x18/0x20 el0_svc_common.constprop.0+0x68/0x160 el0_svc_handler+0x20/0x80 el0_svc+0x8/0xc Mem-Info: active_anon:2856 inactive_anon:5269 isolated_anon:12 active_file:5238 inactive_file:18803 isolated_file:0 unevictable:0 dirty:22 writeback:416 unstable:0 slab_reclaimable:4073 slab_unreclaimable:3408 mapped:727 shmem:7393 pagetables:37 bounce:0 free:4104 free_pcp:118 free_cma:0 Node 0 active_anon:11436kB inactive_anon:21076kB active_file:20988kB inactive_file:75216kB unevictable:0kB isolated(ano Node 0 DMA32 free:16820kB min:1808kB low:2260kB high:2712kB active_anon:11436kB inactive_anon:21076kB active_file:2098B lowmem_reserve[]: 0 0 0 Node 0 DMA32: 508*4kB (UME) 242*8kB (UME) 730*16kB (UM) 21*32kB (UME) 5*64kB (UME) 2*128kB (M) 0*256kB 0*512kB 0*1024kB Node 0 hugepages_total=0 hugepages_free=0 hugepages_surp=0 hugepages_size=1048576kB Node 0 hugepages_total=0 hugepages_free=0 hugepages_surp=0 hugepages_size=32768kB Node 0 hugepages_total=0 hugepages_free=0 hugepages_surp=0 hugepages_size=2048kB Node 0 hugepages_total=0 hugepages_free=0 hugepages_surp=0 hugepages_size=64kB 31455 total pagecache pages 0 pages in swap cache Swap cache stats: add 0, delete 0, find 0/0 Free swap = 0kB Total swap = 0kB 65536 pages RAM 0 pages HighMem/MovableOnly 10766 pages reserved 0 pages cma reserved 0 pages hwpoisoned Reviewed-by: Jun Li <jun.li@nxp.com> Signed-off-by: Peter Chen <peter.chen@nxp.com>
98 lines
2.3 KiB
C
98 lines
2.3 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* udc.h - ChipIdea UDC structures
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*
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* Copyright (C) 2008 Chipidea - MIPS Technologies, Inc. All rights reserved.
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*
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* Author: David Lopo
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*/
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#ifndef __DRIVERS_USB_CHIPIDEA_UDC_H
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#define __DRIVERS_USB_CHIPIDEA_UDC_H
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#include <linux/list.h>
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#define CTRL_PAYLOAD_MAX 64
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#define RX 0 /* similar to USB_DIR_OUT but can be used as an index */
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#define TX 1 /* similar to USB_DIR_IN but can be used as an index */
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/* DMA layout of transfer descriptors */
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struct ci_hw_td {
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/* 0 */
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__le32 next;
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#define TD_TERMINATE BIT(0)
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#define TD_ADDR_MASK (0xFFFFFFEUL << 5)
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/* 1 */
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__le32 token;
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#define TD_STATUS (0x00FFUL << 0)
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#define TD_STATUS_TR_ERR BIT(3)
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#define TD_STATUS_DT_ERR BIT(5)
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#define TD_STATUS_HALTED BIT(6)
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#define TD_STATUS_ACTIVE BIT(7)
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#define TD_MULTO (0x0003UL << 10)
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#define TD_IOC BIT(15)
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#define TD_TOTAL_BYTES (0x7FFFUL << 16)
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/* 2 */
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__le32 page[5];
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#define TD_CURR_OFFSET (0x0FFFUL << 0)
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#define TD_FRAME_NUM (0x07FFUL << 0)
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#define TD_RESERVED_MASK (0x0FFFUL << 0)
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} __attribute__ ((packed, aligned(4)));
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/* DMA layout of queue heads */
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struct ci_hw_qh {
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/* 0 */
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__le32 cap;
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#define QH_IOS BIT(15)
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#define QH_MAX_PKT (0x07FFUL << 16)
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#define QH_ZLT BIT(29)
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#define QH_MULT (0x0003UL << 30)
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#define QH_ISO_MULT(x) ((x >> 11) & 0x03)
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/* 1 */
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__le32 curr;
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/* 2 - 8 */
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struct ci_hw_td td;
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/* 9 */
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__le32 RESERVED;
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struct usb_ctrlrequest setup;
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} __attribute__ ((packed, aligned(4)));
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struct td_node {
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struct list_head td;
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dma_addr_t dma;
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struct ci_hw_td *ptr;
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int td_remaining_size;
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};
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/**
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* struct ci_hw_req - usb request representation
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* @req: request structure for gadget drivers
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* @queue: link to QH list
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* @tds: link to TD list
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*/
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struct ci_hw_req {
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struct usb_request req;
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struct list_head queue;
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struct list_head tds;
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};
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#ifdef CONFIG_USB_CHIPIDEA_UDC
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int ci_hdrc_gadget_init(struct ci_hdrc *ci);
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void ci_hdrc_gadget_destroy(struct ci_hdrc *ci);
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#else
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static inline int ci_hdrc_gadget_init(struct ci_hdrc *ci)
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{
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return -ENXIO;
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}
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static inline void ci_hdrc_gadget_destroy(struct ci_hdrc *ci)
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{
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}
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#endif
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#endif /* __DRIVERS_USB_CHIPIDEA_UDC_H */
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