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) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   3)  * Copyright (c) 2003-2018, Intel Corporation. All rights reserved.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4)  * Intel Management Engine Interface (Intel MEI) Linux driver
^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) #include <linux/export.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8) #include <linux/kthread.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9) #include <linux/interrupt.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10) #include <linux/fs.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11) #include <linux/jiffies.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13) #include <linux/pm_runtime.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15) #include <linux/mei.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) #include "mei_dev.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18) #include "hbm.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19) #include "client.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23)  * mei_irq_compl_handler - dispatch complete handlers
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24)  *	for the completed callbacks
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26)  * @dev: mei device
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27)  * @cmpl_list: list of completed cbs
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) void mei_irq_compl_handler(struct mei_device *dev, struct list_head *cmpl_list)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) 	struct mei_cl_cb *cb, *next;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) 	struct mei_cl *cl;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) 	list_for_each_entry_safe(cb, next, cmpl_list, list) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) 		cl = cb->cl;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) 		list_del_init(&cb->list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) 		dev_dbg(dev->dev, "completing call back.\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) 		mei_cl_complete(cl, cb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) EXPORT_SYMBOL_GPL(mei_irq_compl_handler);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45)  * mei_cl_hbm_equal - check if hbm is addressed to the client
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47)  * @cl: host client
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48)  * @mei_hdr: header of mei client message
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50)  * Return: true if matches, false otherwise
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) static inline int mei_cl_hbm_equal(struct mei_cl *cl,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) 			struct mei_msg_hdr *mei_hdr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) 	return  mei_cl_host_addr(cl) == mei_hdr->host_addr &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) 		mei_cl_me_id(cl) == mei_hdr->me_addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60)  * mei_irq_discard_msg  - discard received message
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62)  * @dev: mei device
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63)  * @hdr: message header
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64)  * @discard_len: the length of the message to discard (excluding header)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) static void mei_irq_discard_msg(struct mei_device *dev, struct mei_msg_hdr *hdr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) 				size_t discard_len)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) 	if (hdr->dma_ring) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) 		mei_dma_ring_read(dev, NULL,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) 				  hdr->extension[dev->rd_msg_hdr_count - 2]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) 		discard_len = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) 	 * no need to check for size as it is guarantied
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) 	 * that length fits into rd_msg_buf
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) 	mei_read_slots(dev, dev->rd_msg_buf, discard_len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) 	dev_dbg(dev->dev, "discarding message " MEI_HDR_FMT "\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) 		MEI_HDR_PRM(hdr));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84)  * mei_cl_irq_read_msg - process client message
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86)  * @cl: reading client
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87)  * @mei_hdr: header of mei client message
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88)  * @meta: extend meta header
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89)  * @cmpl_list: completion list
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91)  * Return: always 0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) static int mei_cl_irq_read_msg(struct mei_cl *cl,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) 			       struct mei_msg_hdr *mei_hdr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) 			       struct mei_ext_meta_hdr *meta,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) 			       struct list_head *cmpl_list)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) 	struct mei_device *dev = cl->dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) 	struct mei_cl_cb *cb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) 	size_t buf_sz;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) 	u32 length;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) 	int ext_len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) 	length = mei_hdr->length;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) 	ext_len = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) 	if (mei_hdr->extended) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) 		ext_len = sizeof(*meta) + mei_slots2data(meta->size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) 		length -= ext_len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) 	cb = list_first_entry_or_null(&cl->rd_pending, struct mei_cl_cb, list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) 	if (!cb) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) 		if (!mei_cl_is_fixed_address(cl)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) 			cl_err(dev, cl, "pending read cb not found\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) 			goto discard;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) 		cb = mei_cl_alloc_cb(cl, mei_cl_mtu(cl), MEI_FOP_READ, cl->fp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) 		if (!cb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) 			goto discard;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) 		list_add_tail(&cb->list, &cl->rd_pending);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) 	if (mei_hdr->extended) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) 		struct mei_ext_hdr *ext;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) 		struct mei_ext_hdr *vtag = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) 		ext = mei_ext_begin(meta);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) 		do {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) 			switch (ext->type) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) 			case MEI_EXT_HDR_VTAG:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) 				vtag = ext;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) 				break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) 			case MEI_EXT_HDR_NONE:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) 				fallthrough;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) 			default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) 				cb->status = -EPROTO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) 				break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) 			}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) 			ext = mei_ext_next(ext);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) 		} while (!mei_ext_last(meta, ext));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) 		if (!vtag) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) 			cl_dbg(dev, cl, "vtag not found in extended header.\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) 			cb->status = -EPROTO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) 			goto discard;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) 		cl_dbg(dev, cl, "vtag: %d\n", vtag->ext_payload[0]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) 		if (cb->vtag && cb->vtag != vtag->ext_payload[0]) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) 			cl_err(dev, cl, "mismatched tag: %d != %d\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) 			       cb->vtag, vtag->ext_payload[0]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) 			cb->status = -EPROTO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) 			goto discard;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) 		cb->vtag = vtag->ext_payload[0];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) 	if (!mei_cl_is_connected(cl)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) 		cl_dbg(dev, cl, "not connected\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) 		cb->status = -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) 		goto discard;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) 	if (mei_hdr->dma_ring)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) 		length = mei_hdr->extension[mei_data2slots(ext_len)];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) 	buf_sz = length + cb->buf_idx;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) 	/* catch for integer overflow */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) 	if (buf_sz < cb->buf_idx) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) 		cl_err(dev, cl, "message is too big len %d idx %zu\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) 		       length, cb->buf_idx);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) 		cb->status = -EMSGSIZE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) 		goto discard;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) 	if (cb->buf.size < buf_sz) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) 		cl_dbg(dev, cl, "message overflow. size %zu len %d idx %zu\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) 			cb->buf.size, length, cb->buf_idx);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) 		cb->status = -EMSGSIZE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) 		goto discard;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) 	if (mei_hdr->dma_ring) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) 		mei_dma_ring_read(dev, cb->buf.data + cb->buf_idx, length);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) 		/*  for DMA read 0 length to generate interrupt to the device */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) 		mei_read_slots(dev, cb->buf.data + cb->buf_idx, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) 	} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) 		mei_read_slots(dev, cb->buf.data + cb->buf_idx, length);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) 	cb->buf_idx += length;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) 	if (mei_hdr->msg_complete) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) 		cl_dbg(dev, cl, "completed read length = %zu\n", cb->buf_idx);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) 		list_move_tail(&cb->list, cmpl_list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) 	} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) 		pm_runtime_mark_last_busy(dev->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) 		pm_request_autosuspend(dev->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) discard:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) 	if (cb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) 		list_move_tail(&cb->list, cmpl_list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) 	mei_irq_discard_msg(dev, mei_hdr, length);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) 	return 0;
^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) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213)  * mei_cl_irq_disconnect_rsp - send disconnection response message
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215)  * @cl: client
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216)  * @cb: callback block.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217)  * @cmpl_list: complete list.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219)  * Return: 0, OK; otherwise, error.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) static int mei_cl_irq_disconnect_rsp(struct mei_cl *cl, struct mei_cl_cb *cb,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) 				     struct list_head *cmpl_list)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) 	struct mei_device *dev = cl->dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) 	u32 msg_slots;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) 	int slots;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) 	int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) 	msg_slots = mei_hbm2slots(sizeof(struct hbm_client_connect_response));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) 	slots = mei_hbuf_empty_slots(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) 	if (slots < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) 		return -EOVERFLOW;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) 	if ((u32)slots < msg_slots)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) 		return -EMSGSIZE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) 	ret = mei_hbm_cl_disconnect_rsp(dev, cl);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) 	list_move_tail(&cb->list, cmpl_list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) 	return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) }
^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)  * mei_cl_irq_read - processes client read related operation from the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245)  *	interrupt thread context - request for flow control credits
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247)  * @cl: client
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248)  * @cb: callback block.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249)  * @cmpl_list: complete list.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251)  * Return: 0, OK; otherwise, error.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) static int mei_cl_irq_read(struct mei_cl *cl, struct mei_cl_cb *cb,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) 			   struct list_head *cmpl_list)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) 	struct mei_device *dev = cl->dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) 	u32 msg_slots;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) 	int slots;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) 	int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) 	if (!list_empty(&cl->rd_pending))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) 		return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) 	msg_slots = mei_hbm2slots(sizeof(struct hbm_flow_control));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) 	slots = mei_hbuf_empty_slots(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) 	if (slots < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) 		return -EOVERFLOW;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) 	if ((u32)slots < msg_slots)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) 		return -EMSGSIZE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) 	ret = mei_hbm_cl_flow_control_req(dev, cl);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) 	if (ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) 		cl->status = ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) 		cb->buf_idx = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) 		list_move_tail(&cb->list, cmpl_list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) 		return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) 	pm_runtime_mark_last_busy(dev->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) 	pm_request_autosuspend(dev->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) 	list_move_tail(&cb->list, &cl->rd_pending);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) static inline bool hdr_is_hbm(struct mei_msg_hdr *mei_hdr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) 	return mei_hdr->host_addr == 0 && mei_hdr->me_addr == 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) static inline bool hdr_is_fixed(struct mei_msg_hdr *mei_hdr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) 	return mei_hdr->host_addr == 0 && mei_hdr->me_addr != 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) static inline int hdr_is_valid(u32 msg_hdr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) 	struct mei_msg_hdr *mei_hdr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) 	u32 expected_len = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) 	mei_hdr = (struct mei_msg_hdr *)&msg_hdr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) 	if (!msg_hdr || mei_hdr->reserved)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) 		return -EBADMSG;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) 	if (mei_hdr->dma_ring)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) 		expected_len += MEI_SLOT_SIZE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) 	if (mei_hdr->extended)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) 		expected_len += MEI_SLOT_SIZE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) 	if (mei_hdr->length < expected_len)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) 		return -EBADMSG;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) }
^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)  * mei_irq_read_handler - bottom half read routine after ISR to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319)  * handle the read processing.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321)  * @dev: the device structure
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322)  * @cmpl_list: An instance of our list structure
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323)  * @slots: slots to read.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325)  * Return: 0 on success, <0 on failure.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) int mei_irq_read_handler(struct mei_device *dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) 			 struct list_head *cmpl_list, s32 *slots)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) 	struct mei_msg_hdr *mei_hdr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) 	struct mei_ext_meta_hdr *meta_hdr = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) 	struct mei_cl *cl;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) 	int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) 	u32 ext_meta_hdr_u32;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) 	u32 hdr_size_left;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) 	u32 hdr_size_ext;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) 	int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) 	int ext_hdr_end;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) 	if (!dev->rd_msg_hdr[0]) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) 		dev->rd_msg_hdr[0] = mei_read_hdr(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) 		dev->rd_msg_hdr_count = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) 		(*slots)--;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) 		dev_dbg(dev->dev, "slots =%08x.\n", *slots);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) 		ret = hdr_is_valid(dev->rd_msg_hdr[0]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) 		if (ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) 			dev_err(dev->dev, "corrupted message header 0x%08X\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) 				dev->rd_msg_hdr[0]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) 			goto end;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) 	mei_hdr = (struct mei_msg_hdr *)dev->rd_msg_hdr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) 	dev_dbg(dev->dev, MEI_HDR_FMT, MEI_HDR_PRM(mei_hdr));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) 	if (mei_slots2data(*slots) < mei_hdr->length) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) 		dev_err(dev->dev, "less data available than length=%08x.\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) 				*slots);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) 		/* we can't read the message */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) 		ret = -ENODATA;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) 		goto end;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) 	ext_hdr_end = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) 	hdr_size_left = mei_hdr->length;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) 	if (mei_hdr->extended) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) 		if (!dev->rd_msg_hdr[1]) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) 			ext_meta_hdr_u32 = mei_read_hdr(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) 			dev->rd_msg_hdr[1] = ext_meta_hdr_u32;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372) 			dev->rd_msg_hdr_count++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) 			(*slots)--;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) 			dev_dbg(dev->dev, "extended header is %08x\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) 				ext_meta_hdr_u32);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) 		meta_hdr = ((struct mei_ext_meta_hdr *)dev->rd_msg_hdr + 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) 		if (check_add_overflow((u32)sizeof(*meta_hdr),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) 				       mei_slots2data(meta_hdr->size),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) 				       &hdr_size_ext)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381) 			dev_err(dev->dev, "extended message size too big %d\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382) 				meta_hdr->size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383) 			return -EBADMSG;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385) 		if (hdr_size_left < hdr_size_ext) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386) 			dev_err(dev->dev, "corrupted message header len %d\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387) 				mei_hdr->length);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388) 			return -EBADMSG;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390) 		hdr_size_left -= hdr_size_ext;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392) 		ext_hdr_end = meta_hdr->size + 2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393) 		for (i = dev->rd_msg_hdr_count; i < ext_hdr_end; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394) 			dev->rd_msg_hdr[i] = mei_read_hdr(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395) 			dev_dbg(dev->dev, "extended header %d is %08x\n", i,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 396) 				dev->rd_msg_hdr[i]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 397) 			dev->rd_msg_hdr_count++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 398) 			(*slots)--;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 399) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 400) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 401) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 402) 	if (mei_hdr->dma_ring) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 403) 		if (hdr_size_left != sizeof(dev->rd_msg_hdr[ext_hdr_end])) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 404) 			dev_err(dev->dev, "corrupted message header len %d\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 405) 				mei_hdr->length);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 406) 			return -EBADMSG;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 407) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 408) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 409) 		dev->rd_msg_hdr[ext_hdr_end] = mei_read_hdr(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 410) 		dev->rd_msg_hdr_count++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 411) 		(*slots)--;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 412) 		mei_hdr->length -= sizeof(dev->rd_msg_hdr[ext_hdr_end]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 413) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 414) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 415) 	/*  HBM message */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 416) 	if (hdr_is_hbm(mei_hdr)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 417) 		ret = mei_hbm_dispatch(dev, mei_hdr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 418) 		if (ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 419) 			dev_dbg(dev->dev, "mei_hbm_dispatch failed ret = %d\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 420) 					ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 421) 			goto end;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 422) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 423) 		goto reset_slots;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 424) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 425) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 426) 	/* find recipient cl */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 427) 	list_for_each_entry(cl, &dev->file_list, link) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 428) 		if (mei_cl_hbm_equal(cl, mei_hdr)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 429) 			cl_dbg(dev, cl, "got a message\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 430) 			ret = mei_cl_irq_read_msg(cl, mei_hdr, meta_hdr, cmpl_list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 431) 			goto reset_slots;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 432) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 433) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 434) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 435) 	/* if no recipient cl was found we assume corrupted header */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 436) 	/* A message for not connected fixed address clients
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 437) 	 * should be silently discarded
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 438) 	 * On power down client may be force cleaned,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 439) 	 * silently discard such messages
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 440) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 441) 	if (hdr_is_fixed(mei_hdr) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 442) 	    dev->dev_state == MEI_DEV_POWER_DOWN) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 443) 		mei_irq_discard_msg(dev, mei_hdr, mei_hdr->length);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 444) 		ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 445) 		goto reset_slots;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 446) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 447) 	dev_err(dev->dev, "no destination client found 0x%08X\n", dev->rd_msg_hdr[0]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 448) 	ret = -EBADMSG;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 449) 	goto end;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 450) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 451) reset_slots:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 452) 	/* reset the number of slots and header */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 453) 	memset(dev->rd_msg_hdr, 0, sizeof(dev->rd_msg_hdr));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 454) 	dev->rd_msg_hdr_count = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 455) 	*slots = mei_count_full_read_slots(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 456) 	if (*slots == -EOVERFLOW) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 457) 		/* overflow - reset */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 458) 		dev_err(dev->dev, "resetting due to slots overflow.\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 459) 		/* set the event since message has been read */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 460) 		ret = -ERANGE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 461) 		goto end;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 462) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 463) end:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 464) 	return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 465) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 466) EXPORT_SYMBOL_GPL(mei_irq_read_handler);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 467) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 468) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 469) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 470)  * mei_irq_write_handler -  dispatch write requests
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 471)  *  after irq received
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 472)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 473)  * @dev: the device structure
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 474)  * @cmpl_list: An instance of our list structure
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 475)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 476)  * Return: 0 on success, <0 on failure.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 477)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 478) int mei_irq_write_handler(struct mei_device *dev, struct list_head *cmpl_list)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 479) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 480) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 481) 	struct mei_cl *cl;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 482) 	struct mei_cl_cb *cb, *next;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 483) 	s32 slots;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 484) 	int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 485) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 486) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 487) 	if (!mei_hbuf_acquire(dev))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 488) 		return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 489) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 490) 	slots = mei_hbuf_empty_slots(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 491) 	if (slots < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 492) 		return -EOVERFLOW;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 493) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 494) 	if (slots == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 495) 		return -EMSGSIZE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 496) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 497) 	/* complete all waiting for write CB */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 498) 	dev_dbg(dev->dev, "complete all waiting for write cb.\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 499) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 500) 	list_for_each_entry_safe(cb, next, &dev->write_waiting_list, list) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 501) 		cl = cb->cl;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 502) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 503) 		cl->status = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 504) 		cl_dbg(dev, cl, "MEI WRITE COMPLETE\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 505) 		cl->writing_state = MEI_WRITE_COMPLETE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 506) 		list_move_tail(&cb->list, cmpl_list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 507) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 508) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 509) 	/* complete control write list CB */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 510) 	dev_dbg(dev->dev, "complete control write list cb.\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 511) 	list_for_each_entry_safe(cb, next, &dev->ctrl_wr_list, list) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 512) 		cl = cb->cl;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 513) 		switch (cb->fop_type) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 514) 		case MEI_FOP_DISCONNECT:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 515) 			/* send disconnect message */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 516) 			ret = mei_cl_irq_disconnect(cl, cb, cmpl_list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 517) 			if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 518) 				return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 519) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 520) 			break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 521) 		case MEI_FOP_READ:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 522) 			/* send flow control message */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 523) 			ret = mei_cl_irq_read(cl, cb, cmpl_list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 524) 			if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 525) 				return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 526) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 527) 			break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 528) 		case MEI_FOP_CONNECT:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 529) 			/* connect message */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 530) 			ret = mei_cl_irq_connect(cl, cb, cmpl_list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 531) 			if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 532) 				return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 533) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 534) 			break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 535) 		case MEI_FOP_DISCONNECT_RSP:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 536) 			/* send disconnect resp */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 537) 			ret = mei_cl_irq_disconnect_rsp(cl, cb, cmpl_list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 538) 			if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 539) 				return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 540) 			break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 541) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 542) 		case MEI_FOP_NOTIFY_START:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 543) 		case MEI_FOP_NOTIFY_STOP:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 544) 			ret = mei_cl_irq_notify(cl, cb, cmpl_list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 545) 			if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 546) 				return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 547) 			break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 548) 		default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 549) 			BUG();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 550) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 551) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 552) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 553) 	/* complete  write list CB */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 554) 	dev_dbg(dev->dev, "complete write list cb.\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 555) 	list_for_each_entry_safe(cb, next, &dev->write_list, list) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 556) 		cl = cb->cl;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 557) 		ret = mei_cl_irq_write(cl, cb, cmpl_list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 558) 		if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 559) 			return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 560) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 561) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 562) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 563) EXPORT_SYMBOL_GPL(mei_irq_write_handler);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 564) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 565) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 566) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 567)  * mei_connect_timeout  - connect/disconnect timeouts
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 568)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 569)  * @cl: host client
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 570)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 571) static void mei_connect_timeout(struct mei_cl *cl)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 572) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 573) 	struct mei_device *dev = cl->dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 574) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 575) 	if (cl->state == MEI_FILE_CONNECTING) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 576) 		if (dev->hbm_f_dot_supported) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 577) 			cl->state = MEI_FILE_DISCONNECT_REQUIRED;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 578) 			wake_up(&cl->wait);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 579) 			return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 580) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 581) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 582) 	mei_reset(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 583) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 584) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 585) #define MEI_STALL_TIMER_FREQ (2 * HZ)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 586) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 587)  * mei_schedule_stall_timer - re-arm stall_timer work
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 588)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 589)  * Schedule stall timer
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 590)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 591)  * @dev: the device structure
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 592)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 593) void mei_schedule_stall_timer(struct mei_device *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 594) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 595) 	schedule_delayed_work(&dev->timer_work, MEI_STALL_TIMER_FREQ);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 596) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 597) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 598) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 599)  * mei_timer - timer function.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 600)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 601)  * @work: pointer to the work_struct structure
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 602)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 603)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 604) void mei_timer(struct work_struct *work)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 605) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 606) 	struct mei_cl *cl;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 607) 	struct mei_device *dev = container_of(work,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 608) 					struct mei_device, timer_work.work);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 609) 	bool reschedule_timer = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 610) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 611) 	mutex_lock(&dev->device_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 612) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 613) 	/* Catch interrupt stalls during HBM init handshake */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 614) 	if (dev->dev_state == MEI_DEV_INIT_CLIENTS &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 615) 	    dev->hbm_state != MEI_HBM_IDLE) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 616) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 617) 		if (dev->init_clients_timer) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 618) 			if (--dev->init_clients_timer == 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 619) 				dev_err(dev->dev, "timer: init clients timeout hbm_state = %d.\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 620) 					dev->hbm_state);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 621) 				mei_reset(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 622) 				goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 623) 			}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 624) 			reschedule_timer = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 625) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 626) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 627) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 628) 	if (dev->dev_state != MEI_DEV_ENABLED)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 629) 		goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 630) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 631) 	/*** connect/disconnect timeouts ***/
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 632) 	list_for_each_entry(cl, &dev->file_list, link) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 633) 		if (cl->timer_count) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 634) 			if (--cl->timer_count == 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 635) 				dev_err(dev->dev, "timer: connect/disconnect timeout.\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 636) 				mei_connect_timeout(cl);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 637) 				goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 638) 			}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 639) 			reschedule_timer = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 640) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 641) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 642) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 643) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 644) 	if (dev->dev_state != MEI_DEV_DISABLED && reschedule_timer)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 645) 		mei_schedule_stall_timer(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 646) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 647) 	mutex_unlock(&dev->device_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 648) }