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![Tomas Winkler](/assets/img/avatar_default.png)
GSC extend header is of variable size and data is provided in a sgl list inside the header and not in the data buffers, need to enable the path. Signed-off-by: Tomas Winkler <tomas.winkler@intel.com> Signed-off-by: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com> Cc: Vitaly Lubart <vitaly.lubart@intel.com> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Link: https://patchwork.freedesktop.org/patch/msgid/20220928004145.745803-2-daniele.ceraolospurio@intel.com
688 lines
16 KiB
C
688 lines
16 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (c) 2003-2018, Intel Corporation. All rights reserved.
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* Intel Management Engine Interface (Intel MEI) Linux driver
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*/
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#include <linux/export.h>
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#include <linux/kthread.h>
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#include <linux/interrupt.h>
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#include <linux/fs.h>
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#include <linux/jiffies.h>
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#include <linux/slab.h>
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#include <linux/pm_runtime.h>
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#include <linux/mei.h>
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#include "mei_dev.h"
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#include "hbm.h"
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#include "client.h"
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/**
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* mei_irq_compl_handler - dispatch complete handlers
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* for the completed callbacks
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*
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* @dev: mei device
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* @cmpl_list: list of completed cbs
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*/
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void mei_irq_compl_handler(struct mei_device *dev, struct list_head *cmpl_list)
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{
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struct mei_cl_cb *cb, *next;
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struct mei_cl *cl;
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list_for_each_entry_safe(cb, next, cmpl_list, list) {
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cl = cb->cl;
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list_del_init(&cb->list);
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dev_dbg(dev->dev, "completing call back.\n");
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mei_cl_complete(cl, cb);
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}
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}
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EXPORT_SYMBOL_GPL(mei_irq_compl_handler);
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/**
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* mei_cl_hbm_equal - check if hbm is addressed to the client
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*
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* @cl: host client
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* @mei_hdr: header of mei client message
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*
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* Return: true if matches, false otherwise
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*/
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static inline int mei_cl_hbm_equal(struct mei_cl *cl,
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struct mei_msg_hdr *mei_hdr)
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{
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return mei_cl_host_addr(cl) == mei_hdr->host_addr &&
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mei_cl_me_id(cl) == mei_hdr->me_addr;
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}
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/**
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* mei_irq_discard_msg - discard received message
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*
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* @dev: mei device
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* @hdr: message header
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* @discard_len: the length of the message to discard (excluding header)
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*/
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static void mei_irq_discard_msg(struct mei_device *dev, struct mei_msg_hdr *hdr,
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size_t discard_len)
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{
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if (hdr->dma_ring) {
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mei_dma_ring_read(dev, NULL,
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hdr->extension[dev->rd_msg_hdr_count - 2]);
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discard_len = 0;
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}
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/*
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* no need to check for size as it is guarantied
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* that length fits into rd_msg_buf
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*/
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mei_read_slots(dev, dev->rd_msg_buf, discard_len);
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dev_dbg(dev->dev, "discarding message " MEI_HDR_FMT "\n",
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MEI_HDR_PRM(hdr));
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}
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/**
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* mei_cl_irq_read_msg - process client message
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*
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* @cl: reading client
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* @mei_hdr: header of mei client message
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* @meta: extend meta header
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* @cmpl_list: completion list
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*
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* Return: always 0
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*/
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static int mei_cl_irq_read_msg(struct mei_cl *cl,
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struct mei_msg_hdr *mei_hdr,
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struct mei_ext_meta_hdr *meta,
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struct list_head *cmpl_list)
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{
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struct mei_device *dev = cl->dev;
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struct mei_cl_cb *cb;
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struct mei_ext_hdr_vtag *vtag_hdr = NULL;
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struct mei_ext_hdr_gsc_f2h *gsc_f2h = NULL;
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size_t buf_sz;
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u32 length;
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u32 ext_len;
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length = mei_hdr->length;
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ext_len = 0;
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if (mei_hdr->extended) {
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ext_len = sizeof(*meta) + mei_slots2data(meta->size);
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length -= ext_len;
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}
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cb = list_first_entry_or_null(&cl->rd_pending, struct mei_cl_cb, list);
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if (!cb) {
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if (!mei_cl_is_fixed_address(cl)) {
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cl_err(dev, cl, "pending read cb not found\n");
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goto discard;
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}
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cb = mei_cl_alloc_cb(cl, mei_cl_mtu(cl), MEI_FOP_READ, cl->fp);
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if (!cb)
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goto discard;
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list_add_tail(&cb->list, &cl->rd_pending);
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}
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if (mei_hdr->extended) {
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struct mei_ext_hdr *ext = mei_ext_begin(meta);
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do {
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switch (ext->type) {
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case MEI_EXT_HDR_VTAG:
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vtag_hdr = (struct mei_ext_hdr_vtag *)ext;
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break;
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case MEI_EXT_HDR_GSC:
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gsc_f2h = (struct mei_ext_hdr_gsc_f2h *)ext;
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cb->ext_hdr = kzalloc(sizeof(*gsc_f2h), GFP_KERNEL);
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if (!cb->ext_hdr) {
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cb->status = -ENOMEM;
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goto discard;
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}
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break;
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case MEI_EXT_HDR_NONE:
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fallthrough;
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default:
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cl_err(dev, cl, "unknown extended header\n");
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cb->status = -EPROTO;
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break;
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}
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ext = mei_ext_next(ext);
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} while (!mei_ext_last(meta, ext));
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if (!vtag_hdr && !gsc_f2h) {
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cl_dbg(dev, cl, "no vtag or gsc found in extended header.\n");
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cb->status = -EPROTO;
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goto discard;
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}
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}
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if (vtag_hdr) {
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cl_dbg(dev, cl, "vtag: %d\n", vtag_hdr->vtag);
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if (cb->vtag && cb->vtag != vtag_hdr->vtag) {
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cl_err(dev, cl, "mismatched tag: %d != %d\n",
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cb->vtag, vtag_hdr->vtag);
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cb->status = -EPROTO;
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goto discard;
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}
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cb->vtag = vtag_hdr->vtag;
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}
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if (gsc_f2h) {
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u32 ext_hdr_len = mei_ext_hdr_len(&gsc_f2h->hdr);
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if (!dev->hbm_f_gsc_supported) {
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cl_err(dev, cl, "gsc extended header is not supported\n");
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cb->status = -EPROTO;
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goto discard;
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}
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if (length) {
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cl_err(dev, cl, "no data allowed in cb with gsc\n");
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cb->status = -EPROTO;
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goto discard;
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}
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if (ext_hdr_len > sizeof(*gsc_f2h)) {
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cl_err(dev, cl, "gsc extended header is too big %u\n", ext_hdr_len);
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cb->status = -EPROTO;
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goto discard;
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}
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memcpy(cb->ext_hdr, gsc_f2h, ext_hdr_len);
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}
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if (!mei_cl_is_connected(cl)) {
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cl_dbg(dev, cl, "not connected\n");
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cb->status = -ENODEV;
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goto discard;
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}
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if (mei_hdr->dma_ring)
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length = mei_hdr->extension[mei_data2slots(ext_len)];
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buf_sz = length + cb->buf_idx;
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/* catch for integer overflow */
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if (buf_sz < cb->buf_idx) {
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cl_err(dev, cl, "message is too big len %d idx %zu\n",
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length, cb->buf_idx);
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cb->status = -EMSGSIZE;
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goto discard;
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}
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if (cb->buf.size < buf_sz) {
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cl_dbg(dev, cl, "message overflow. size %zu len %d idx %zu\n",
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cb->buf.size, length, cb->buf_idx);
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cb->status = -EMSGSIZE;
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goto discard;
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}
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if (mei_hdr->dma_ring) {
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mei_dma_ring_read(dev, cb->buf.data + cb->buf_idx, length);
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/* for DMA read 0 length to generate interrupt to the device */
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mei_read_slots(dev, cb->buf.data + cb->buf_idx, 0);
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} else {
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mei_read_slots(dev, cb->buf.data + cb->buf_idx, length);
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}
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cb->buf_idx += length;
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if (mei_hdr->msg_complete) {
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cl_dbg(dev, cl, "completed read length = %zu\n", cb->buf_idx);
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list_move_tail(&cb->list, cmpl_list);
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} else {
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pm_runtime_mark_last_busy(dev->dev);
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pm_request_autosuspend(dev->dev);
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}
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return 0;
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discard:
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if (cb)
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list_move_tail(&cb->list, cmpl_list);
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mei_irq_discard_msg(dev, mei_hdr, length);
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return 0;
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}
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/**
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* mei_cl_irq_disconnect_rsp - send disconnection response message
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*
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* @cl: client
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* @cb: callback block.
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* @cmpl_list: complete list.
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*
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* Return: 0, OK; otherwise, error.
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*/
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static int mei_cl_irq_disconnect_rsp(struct mei_cl *cl, struct mei_cl_cb *cb,
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struct list_head *cmpl_list)
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{
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struct mei_device *dev = cl->dev;
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u32 msg_slots;
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int slots;
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int ret;
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msg_slots = mei_hbm2slots(sizeof(struct hbm_client_connect_response));
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slots = mei_hbuf_empty_slots(dev);
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if (slots < 0)
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return -EOVERFLOW;
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if ((u32)slots < msg_slots)
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return -EMSGSIZE;
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ret = mei_hbm_cl_disconnect_rsp(dev, cl);
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list_move_tail(&cb->list, cmpl_list);
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return ret;
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}
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/**
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* mei_cl_irq_read - processes client read related operation from the
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* interrupt thread context - request for flow control credits
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*
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* @cl: client
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* @cb: callback block.
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* @cmpl_list: complete list.
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*
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* Return: 0, OK; otherwise, error.
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*/
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static int mei_cl_irq_read(struct mei_cl *cl, struct mei_cl_cb *cb,
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struct list_head *cmpl_list)
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{
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struct mei_device *dev = cl->dev;
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u32 msg_slots;
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int slots;
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int ret;
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if (!list_empty(&cl->rd_pending))
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return 0;
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msg_slots = mei_hbm2slots(sizeof(struct hbm_flow_control));
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slots = mei_hbuf_empty_slots(dev);
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if (slots < 0)
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return -EOVERFLOW;
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if ((u32)slots < msg_slots)
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return -EMSGSIZE;
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ret = mei_hbm_cl_flow_control_req(dev, cl);
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if (ret) {
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cl->status = ret;
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cb->buf_idx = 0;
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list_move_tail(&cb->list, cmpl_list);
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return ret;
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}
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pm_runtime_mark_last_busy(dev->dev);
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pm_request_autosuspend(dev->dev);
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list_move_tail(&cb->list, &cl->rd_pending);
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return 0;
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}
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static inline bool hdr_is_hbm(struct mei_msg_hdr *mei_hdr)
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{
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return mei_hdr->host_addr == 0 && mei_hdr->me_addr == 0;
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}
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static inline bool hdr_is_fixed(struct mei_msg_hdr *mei_hdr)
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{
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return mei_hdr->host_addr == 0 && mei_hdr->me_addr != 0;
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}
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static inline int hdr_is_valid(u32 msg_hdr)
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{
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struct mei_msg_hdr *mei_hdr;
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u32 expected_len = 0;
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mei_hdr = (struct mei_msg_hdr *)&msg_hdr;
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if (!msg_hdr || mei_hdr->reserved)
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return -EBADMSG;
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if (mei_hdr->dma_ring)
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expected_len += MEI_SLOT_SIZE;
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if (mei_hdr->extended)
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expected_len += MEI_SLOT_SIZE;
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if (mei_hdr->length < expected_len)
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return -EBADMSG;
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return 0;
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}
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/**
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* mei_irq_read_handler - bottom half read routine after ISR to
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* handle the read processing.
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*
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* @dev: the device structure
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* @cmpl_list: An instance of our list structure
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* @slots: slots to read.
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*
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* Return: 0 on success, <0 on failure.
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*/
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int mei_irq_read_handler(struct mei_device *dev,
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struct list_head *cmpl_list, s32 *slots)
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{
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struct mei_msg_hdr *mei_hdr;
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struct mei_ext_meta_hdr *meta_hdr = NULL;
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struct mei_cl *cl;
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int ret;
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u32 hdr_size_left;
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u32 hdr_size_ext;
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int i;
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int ext_hdr_end;
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if (!dev->rd_msg_hdr[0]) {
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dev->rd_msg_hdr[0] = mei_read_hdr(dev);
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dev->rd_msg_hdr_count = 1;
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(*slots)--;
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dev_dbg(dev->dev, "slots =%08x.\n", *slots);
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ret = hdr_is_valid(dev->rd_msg_hdr[0]);
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if (ret) {
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dev_err(dev->dev, "corrupted message header 0x%08X\n",
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dev->rd_msg_hdr[0]);
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goto end;
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}
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}
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mei_hdr = (struct mei_msg_hdr *)dev->rd_msg_hdr;
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dev_dbg(dev->dev, MEI_HDR_FMT, MEI_HDR_PRM(mei_hdr));
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if (mei_slots2data(*slots) < mei_hdr->length) {
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dev_err(dev->dev, "less data available than length=%08x.\n",
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*slots);
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/* we can't read the message */
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ret = -ENODATA;
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goto end;
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}
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ext_hdr_end = 1;
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hdr_size_left = mei_hdr->length;
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if (mei_hdr->extended) {
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if (!dev->rd_msg_hdr[1]) {
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dev->rd_msg_hdr[1] = mei_read_hdr(dev);
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dev->rd_msg_hdr_count++;
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(*slots)--;
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dev_dbg(dev->dev, "extended header is %08x\n", dev->rd_msg_hdr[1]);
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}
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meta_hdr = ((struct mei_ext_meta_hdr *)&dev->rd_msg_hdr[1]);
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if (check_add_overflow((u32)sizeof(*meta_hdr),
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mei_slots2data(meta_hdr->size),
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&hdr_size_ext)) {
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dev_err(dev->dev, "extended message size too big %d\n",
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meta_hdr->size);
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return -EBADMSG;
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}
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if (hdr_size_left < hdr_size_ext) {
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dev_err(dev->dev, "corrupted message header len %d\n",
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mei_hdr->length);
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return -EBADMSG;
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}
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hdr_size_left -= hdr_size_ext;
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ext_hdr_end = meta_hdr->size + 2;
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for (i = dev->rd_msg_hdr_count; i < ext_hdr_end; i++) {
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dev->rd_msg_hdr[i] = mei_read_hdr(dev);
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dev_dbg(dev->dev, "extended header %d is %08x\n", i,
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dev->rd_msg_hdr[i]);
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dev->rd_msg_hdr_count++;
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(*slots)--;
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}
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}
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if (mei_hdr->dma_ring) {
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if (hdr_size_left != sizeof(dev->rd_msg_hdr[ext_hdr_end])) {
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dev_err(dev->dev, "corrupted message header len %d\n",
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mei_hdr->length);
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return -EBADMSG;
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}
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dev->rd_msg_hdr[ext_hdr_end] = mei_read_hdr(dev);
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dev->rd_msg_hdr_count++;
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(*slots)--;
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mei_hdr->length -= sizeof(dev->rd_msg_hdr[ext_hdr_end]);
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}
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/* HBM message */
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if (hdr_is_hbm(mei_hdr)) {
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ret = mei_hbm_dispatch(dev, mei_hdr);
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if (ret) {
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dev_dbg(dev->dev, "mei_hbm_dispatch failed ret = %d\n",
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ret);
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goto end;
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}
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goto reset_slots;
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}
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/* find recipient cl */
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list_for_each_entry(cl, &dev->file_list, link) {
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if (mei_cl_hbm_equal(cl, mei_hdr)) {
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cl_dbg(dev, cl, "got a message\n");
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ret = mei_cl_irq_read_msg(cl, mei_hdr, meta_hdr, cmpl_list);
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goto reset_slots;
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}
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}
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/* if no recipient cl was found we assume corrupted header */
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/* A message for not connected fixed address clients
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* should be silently discarded
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* On power down client may be force cleaned,
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* silently discard such messages
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*/
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if (hdr_is_fixed(mei_hdr) ||
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dev->dev_state == MEI_DEV_POWER_DOWN) {
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mei_irq_discard_msg(dev, mei_hdr, mei_hdr->length);
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ret = 0;
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goto reset_slots;
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}
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dev_err(dev->dev, "no destination client found 0x%08X\n", dev->rd_msg_hdr[0]);
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ret = -EBADMSG;
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goto end;
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reset_slots:
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/* reset the number of slots and header */
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memset(dev->rd_msg_hdr, 0, sizeof(dev->rd_msg_hdr));
|
|
dev->rd_msg_hdr_count = 0;
|
|
*slots = mei_count_full_read_slots(dev);
|
|
if (*slots == -EOVERFLOW) {
|
|
/* overflow - reset */
|
|
dev_err(dev->dev, "resetting due to slots overflow.\n");
|
|
/* set the event since message has been read */
|
|
ret = -ERANGE;
|
|
goto end;
|
|
}
|
|
end:
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(mei_irq_read_handler);
|
|
|
|
|
|
/**
|
|
* mei_irq_write_handler - dispatch write requests
|
|
* after irq received
|
|
*
|
|
* @dev: the device structure
|
|
* @cmpl_list: An instance of our list structure
|
|
*
|
|
* Return: 0 on success, <0 on failure.
|
|
*/
|
|
int mei_irq_write_handler(struct mei_device *dev, struct list_head *cmpl_list)
|
|
{
|
|
|
|
struct mei_cl *cl;
|
|
struct mei_cl_cb *cb, *next;
|
|
s32 slots;
|
|
int ret;
|
|
|
|
|
|
if (!mei_hbuf_acquire(dev))
|
|
return 0;
|
|
|
|
slots = mei_hbuf_empty_slots(dev);
|
|
if (slots < 0)
|
|
return -EOVERFLOW;
|
|
|
|
if (slots == 0)
|
|
return -EMSGSIZE;
|
|
|
|
/* complete all waiting for write CB */
|
|
dev_dbg(dev->dev, "complete all waiting for write cb.\n");
|
|
|
|
list_for_each_entry_safe(cb, next, &dev->write_waiting_list, list) {
|
|
cl = cb->cl;
|
|
|
|
cl->status = 0;
|
|
cl_dbg(dev, cl, "MEI WRITE COMPLETE\n");
|
|
cl->writing_state = MEI_WRITE_COMPLETE;
|
|
list_move_tail(&cb->list, cmpl_list);
|
|
}
|
|
|
|
/* complete control write list CB */
|
|
dev_dbg(dev->dev, "complete control write list cb.\n");
|
|
list_for_each_entry_safe(cb, next, &dev->ctrl_wr_list, list) {
|
|
cl = cb->cl;
|
|
switch (cb->fop_type) {
|
|
case MEI_FOP_DISCONNECT:
|
|
/* send disconnect message */
|
|
ret = mei_cl_irq_disconnect(cl, cb, cmpl_list);
|
|
if (ret)
|
|
return ret;
|
|
|
|
break;
|
|
case MEI_FOP_READ:
|
|
/* send flow control message */
|
|
ret = mei_cl_irq_read(cl, cb, cmpl_list);
|
|
if (ret)
|
|
return ret;
|
|
|
|
break;
|
|
case MEI_FOP_CONNECT:
|
|
/* connect message */
|
|
ret = mei_cl_irq_connect(cl, cb, cmpl_list);
|
|
if (ret)
|
|
return ret;
|
|
|
|
break;
|
|
case MEI_FOP_DISCONNECT_RSP:
|
|
/* send disconnect resp */
|
|
ret = mei_cl_irq_disconnect_rsp(cl, cb, cmpl_list);
|
|
if (ret)
|
|
return ret;
|
|
break;
|
|
|
|
case MEI_FOP_NOTIFY_START:
|
|
case MEI_FOP_NOTIFY_STOP:
|
|
ret = mei_cl_irq_notify(cl, cb, cmpl_list);
|
|
if (ret)
|
|
return ret;
|
|
break;
|
|
case MEI_FOP_DMA_MAP:
|
|
ret = mei_cl_irq_dma_map(cl, cb, cmpl_list);
|
|
if (ret)
|
|
return ret;
|
|
break;
|
|
case MEI_FOP_DMA_UNMAP:
|
|
ret = mei_cl_irq_dma_unmap(cl, cb, cmpl_list);
|
|
if (ret)
|
|
return ret;
|
|
break;
|
|
default:
|
|
BUG();
|
|
}
|
|
|
|
}
|
|
/* complete write list CB */
|
|
dev_dbg(dev->dev, "complete write list cb.\n");
|
|
list_for_each_entry_safe(cb, next, &dev->write_list, list) {
|
|
cl = cb->cl;
|
|
ret = mei_cl_irq_write(cl, cb, cmpl_list);
|
|
if (ret)
|
|
return ret;
|
|
}
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(mei_irq_write_handler);
|
|
|
|
|
|
/**
|
|
* mei_connect_timeout - connect/disconnect timeouts
|
|
*
|
|
* @cl: host client
|
|
*/
|
|
static void mei_connect_timeout(struct mei_cl *cl)
|
|
{
|
|
struct mei_device *dev = cl->dev;
|
|
|
|
if (cl->state == MEI_FILE_CONNECTING) {
|
|
if (dev->hbm_f_dot_supported) {
|
|
cl->state = MEI_FILE_DISCONNECT_REQUIRED;
|
|
wake_up(&cl->wait);
|
|
return;
|
|
}
|
|
}
|
|
mei_reset(dev);
|
|
}
|
|
|
|
#define MEI_STALL_TIMER_FREQ (2 * HZ)
|
|
/**
|
|
* mei_schedule_stall_timer - re-arm stall_timer work
|
|
*
|
|
* Schedule stall timer
|
|
*
|
|
* @dev: the device structure
|
|
*/
|
|
void mei_schedule_stall_timer(struct mei_device *dev)
|
|
{
|
|
schedule_delayed_work(&dev->timer_work, MEI_STALL_TIMER_FREQ);
|
|
}
|
|
|
|
/**
|
|
* mei_timer - timer function.
|
|
*
|
|
* @work: pointer to the work_struct structure
|
|
*
|
|
*/
|
|
void mei_timer(struct work_struct *work)
|
|
{
|
|
struct mei_cl *cl;
|
|
struct mei_device *dev = container_of(work,
|
|
struct mei_device, timer_work.work);
|
|
bool reschedule_timer = false;
|
|
|
|
mutex_lock(&dev->device_lock);
|
|
|
|
/* Catch interrupt stalls during HBM init handshake */
|
|
if (dev->dev_state == MEI_DEV_INIT_CLIENTS &&
|
|
dev->hbm_state != MEI_HBM_IDLE) {
|
|
|
|
if (dev->init_clients_timer) {
|
|
if (--dev->init_clients_timer == 0) {
|
|
dev_err(dev->dev, "timer: init clients timeout hbm_state = %d.\n",
|
|
dev->hbm_state);
|
|
mei_reset(dev);
|
|
goto out;
|
|
}
|
|
reschedule_timer = true;
|
|
}
|
|
}
|
|
|
|
if (dev->dev_state != MEI_DEV_ENABLED)
|
|
goto out;
|
|
|
|
/*** connect/disconnect timeouts ***/
|
|
list_for_each_entry(cl, &dev->file_list, link) {
|
|
if (cl->timer_count) {
|
|
if (--cl->timer_count == 0) {
|
|
dev_err(dev->dev, "timer: connect/disconnect timeout.\n");
|
|
mei_connect_timeout(cl);
|
|
goto out;
|
|
}
|
|
reschedule_timer = true;
|
|
}
|
|
}
|
|
|
|
out:
|
|
if (dev->dev_state != MEI_DEV_DISABLED && reschedule_timer)
|
|
mei_schedule_stall_timer(dev);
|
|
|
|
mutex_unlock(&dev->device_lock);
|
|
}
|