![Jakub Kicinski](/assets/img/avatar_default.png)
Minor conflicts in net/mptcp/protocol.h and tools/testing/selftests/net/Makefile. In both cases code was added on both sides in the same place so just keep both. Signed-off-by: Jakub Kicinski <kuba@kernel.org>
1664 lines
46 KiB
C
1664 lines
46 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/* Copyright (c) 2012-2018, The Linux Foundation. All rights reserved.
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* Copyright (C) 2019-2020 Linaro Ltd.
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*/
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#include <linux/types.h>
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#include <linux/device.h>
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#include <linux/slab.h>
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#include <linux/bitfield.h>
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#include <linux/if_rmnet.h>
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#include <linux/dma-direction.h>
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#include "gsi.h"
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#include "gsi_trans.h"
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#include "ipa.h"
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#include "ipa_data.h"
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#include "ipa_endpoint.h"
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#include "ipa_cmd.h"
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#include "ipa_mem.h"
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#include "ipa_modem.h"
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#include "ipa_table.h"
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#include "ipa_gsi.h"
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#include "ipa_clock.h"
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#define atomic_dec_not_zero(v) atomic_add_unless((v), -1, 0)
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#define IPA_REPLENISH_BATCH 16
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/* RX buffer is 1 page (or a power-of-2 contiguous pages) */
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#define IPA_RX_BUFFER_SIZE 8192 /* PAGE_SIZE > 4096 wastes a LOT */
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/* The amount of RX buffer space consumed by standard skb overhead */
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#define IPA_RX_BUFFER_OVERHEAD (PAGE_SIZE - SKB_MAX_ORDER(NET_SKB_PAD, 0))
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/* Where to find the QMAP mux_id for a packet within modem-supplied metadata */
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#define IPA_ENDPOINT_QMAP_METADATA_MASK 0x000000ff /* host byte order */
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#define IPA_ENDPOINT_RESET_AGGR_RETRY_MAX 3
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#define IPA_AGGR_TIME_LIMIT_DEFAULT 500 /* microseconds */
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/** enum ipa_status_opcode - status element opcode hardware values */
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enum ipa_status_opcode {
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IPA_STATUS_OPCODE_PACKET = 0x01,
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IPA_STATUS_OPCODE_DROPPED_PACKET = 0x04,
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IPA_STATUS_OPCODE_SUSPENDED_PACKET = 0x08,
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IPA_STATUS_OPCODE_PACKET_2ND_PASS = 0x40,
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};
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/** enum ipa_status_exception - status element exception type */
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enum ipa_status_exception {
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/* 0 means no exception */
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IPA_STATUS_EXCEPTION_DEAGGR = 0x01,
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};
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/* Status element provided by hardware */
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struct ipa_status {
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u8 opcode; /* enum ipa_status_opcode */
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u8 exception; /* enum ipa_status_exception */
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__le16 mask;
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__le16 pkt_len;
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u8 endp_src_idx;
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u8 endp_dst_idx;
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__le32 metadata;
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__le32 flags1;
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__le64 flags2;
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__le32 flags3;
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__le32 flags4;
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};
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/* Field masks for struct ipa_status structure fields */
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#define IPA_STATUS_DST_IDX_FMASK GENMASK(4, 0)
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#define IPA_STATUS_FLAGS1_RT_RULE_ID_FMASK GENMASK(31, 22)
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#ifdef IPA_VALIDATE
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static void ipa_endpoint_validate_build(void)
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{
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/* The aggregation byte limit defines the point at which an
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* aggregation window will close. It is programmed into the
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* IPA hardware as a number of KB. We don't use "hard byte
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* limit" aggregation, which means that we need to supply
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* enough space in a receive buffer to hold a complete MTU
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* plus normal skb overhead *after* that aggregation byte
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* limit has been crossed.
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*
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* This check just ensures we don't define a receive buffer
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* size that would exceed what we can represent in the field
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* that is used to program its size.
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*/
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BUILD_BUG_ON(IPA_RX_BUFFER_SIZE >
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field_max(AGGR_BYTE_LIMIT_FMASK) * SZ_1K +
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IPA_MTU + IPA_RX_BUFFER_OVERHEAD);
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/* I honestly don't know where this requirement comes from. But
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* it holds, and if we someday need to loosen the constraint we
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* can try to track it down.
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*/
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BUILD_BUG_ON(sizeof(struct ipa_status) % 4);
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}
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static bool ipa_endpoint_data_valid_one(struct ipa *ipa, u32 count,
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const struct ipa_gsi_endpoint_data *all_data,
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const struct ipa_gsi_endpoint_data *data)
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{
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const struct ipa_gsi_endpoint_data *other_data;
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struct device *dev = &ipa->pdev->dev;
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enum ipa_endpoint_name other_name;
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if (ipa_gsi_endpoint_data_empty(data))
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return true;
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if (!data->toward_ipa) {
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if (data->endpoint.filter_support) {
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dev_err(dev, "filtering not supported for "
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"RX endpoint %u\n",
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data->endpoint_id);
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return false;
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}
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return true; /* Nothing more to check for RX */
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}
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if (data->endpoint.config.status_enable) {
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other_name = data->endpoint.config.tx.status_endpoint;
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if (other_name >= count) {
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dev_err(dev, "status endpoint name %u out of range "
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"for endpoint %u\n",
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other_name, data->endpoint_id);
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return false;
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}
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/* Status endpoint must be defined... */
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other_data = &all_data[other_name];
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if (ipa_gsi_endpoint_data_empty(other_data)) {
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dev_err(dev, "DMA endpoint name %u undefined "
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"for endpoint %u\n",
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other_name, data->endpoint_id);
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return false;
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}
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/* ...and has to be an RX endpoint... */
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if (other_data->toward_ipa) {
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dev_err(dev,
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"status endpoint for endpoint %u not RX\n",
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data->endpoint_id);
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return false;
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}
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/* ...and if it's to be an AP endpoint... */
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if (other_data->ee_id == GSI_EE_AP) {
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/* ...make sure it has status enabled. */
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if (!other_data->endpoint.config.status_enable) {
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dev_err(dev,
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"status not enabled for endpoint %u\n",
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other_data->endpoint_id);
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return false;
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}
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}
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}
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if (data->endpoint.config.dma_mode) {
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other_name = data->endpoint.config.dma_endpoint;
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if (other_name >= count) {
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dev_err(dev, "DMA endpoint name %u out of range "
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"for endpoint %u\n",
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other_name, data->endpoint_id);
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return false;
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}
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other_data = &all_data[other_name];
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if (ipa_gsi_endpoint_data_empty(other_data)) {
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dev_err(dev, "DMA endpoint name %u undefined "
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"for endpoint %u\n",
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other_name, data->endpoint_id);
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return false;
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}
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}
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return true;
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}
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static bool ipa_endpoint_data_valid(struct ipa *ipa, u32 count,
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const struct ipa_gsi_endpoint_data *data)
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{
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const struct ipa_gsi_endpoint_data *dp = data;
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struct device *dev = &ipa->pdev->dev;
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enum ipa_endpoint_name name;
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ipa_endpoint_validate_build();
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if (count > IPA_ENDPOINT_COUNT) {
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dev_err(dev, "too many endpoints specified (%u > %u)\n",
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count, IPA_ENDPOINT_COUNT);
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return false;
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}
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/* Make sure needed endpoints have defined data */
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if (ipa_gsi_endpoint_data_empty(&data[IPA_ENDPOINT_AP_COMMAND_TX])) {
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dev_err(dev, "command TX endpoint not defined\n");
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return false;
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}
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if (ipa_gsi_endpoint_data_empty(&data[IPA_ENDPOINT_AP_LAN_RX])) {
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dev_err(dev, "LAN RX endpoint not defined\n");
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return false;
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}
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if (ipa_gsi_endpoint_data_empty(&data[IPA_ENDPOINT_AP_MODEM_TX])) {
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dev_err(dev, "AP->modem TX endpoint not defined\n");
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return false;
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}
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if (ipa_gsi_endpoint_data_empty(&data[IPA_ENDPOINT_AP_MODEM_RX])) {
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dev_err(dev, "AP<-modem RX endpoint not defined\n");
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return false;
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}
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for (name = 0; name < count; name++, dp++)
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if (!ipa_endpoint_data_valid_one(ipa, count, data, dp))
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return false;
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return true;
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}
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#else /* !IPA_VALIDATE */
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static bool ipa_endpoint_data_valid(struct ipa *ipa, u32 count,
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const struct ipa_gsi_endpoint_data *data)
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{
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return true;
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}
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#endif /* !IPA_VALIDATE */
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/* Allocate a transaction to use on a non-command endpoint */
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static struct gsi_trans *ipa_endpoint_trans_alloc(struct ipa_endpoint *endpoint,
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u32 tre_count)
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{
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struct gsi *gsi = &endpoint->ipa->gsi;
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u32 channel_id = endpoint->channel_id;
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enum dma_data_direction direction;
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direction = endpoint->toward_ipa ? DMA_TO_DEVICE : DMA_FROM_DEVICE;
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return gsi_channel_trans_alloc(gsi, channel_id, tre_count, direction);
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}
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/* suspend_delay represents suspend for RX, delay for TX endpoints.
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* Note that suspend is not supported starting with IPA v4.0.
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*/
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static bool
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ipa_endpoint_init_ctrl(struct ipa_endpoint *endpoint, bool suspend_delay)
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{
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u32 offset = IPA_REG_ENDP_INIT_CTRL_N_OFFSET(endpoint->endpoint_id);
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struct ipa *ipa = endpoint->ipa;
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bool state;
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u32 mask;
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u32 val;
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/* Suspend is not supported for IPA v4.0+. Delay doesn't work
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* correctly on IPA v4.2.
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*
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* if (endpoint->toward_ipa)
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* assert(ipa->version != IPA_VERSION_4.2);
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* else
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* assert(ipa->version == IPA_VERSION_3_5_1);
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*/
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mask = endpoint->toward_ipa ? ENDP_DELAY_FMASK : ENDP_SUSPEND_FMASK;
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val = ioread32(ipa->reg_virt + offset);
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/* Don't bother if it's already in the requested state */
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state = !!(val & mask);
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if (suspend_delay != state) {
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val ^= mask;
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iowrite32(val, ipa->reg_virt + offset);
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}
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return state;
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}
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/* We currently don't care what the previous state was for delay mode */
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static void
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ipa_endpoint_program_delay(struct ipa_endpoint *endpoint, bool enable)
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{
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/* assert(endpoint->toward_ipa); */
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/* Delay mode doesn't work properly for IPA v4.2 */
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if (endpoint->ipa->version != IPA_VERSION_4_2)
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(void)ipa_endpoint_init_ctrl(endpoint, enable);
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}
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static bool ipa_endpoint_aggr_active(struct ipa_endpoint *endpoint)
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{
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u32 mask = BIT(endpoint->endpoint_id);
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struct ipa *ipa = endpoint->ipa;
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u32 offset;
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u32 val;
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/* assert(mask & ipa->available); */
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offset = ipa_reg_state_aggr_active_offset(ipa->version);
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val = ioread32(ipa->reg_virt + offset);
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return !!(val & mask);
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}
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static void ipa_endpoint_force_close(struct ipa_endpoint *endpoint)
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{
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u32 mask = BIT(endpoint->endpoint_id);
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struct ipa *ipa = endpoint->ipa;
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/* assert(mask & ipa->available); */
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iowrite32(mask, ipa->reg_virt + IPA_REG_AGGR_FORCE_CLOSE_OFFSET);
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}
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/**
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* ipa_endpoint_suspend_aggr() - Emulate suspend interrupt
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* @endpoint: Endpoint on which to emulate a suspend
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*
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* Emulate suspend IPA interrupt to unsuspend an endpoint suspended
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* with an open aggregation frame. This is to work around a hardware
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* issue in IPA version 3.5.1 where the suspend interrupt will not be
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* generated when it should be.
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*/
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static void ipa_endpoint_suspend_aggr(struct ipa_endpoint *endpoint)
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{
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struct ipa *ipa = endpoint->ipa;
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if (!endpoint->data->aggregation)
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return;
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/* Nothing to do if the endpoint doesn't have aggregation open */
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if (!ipa_endpoint_aggr_active(endpoint))
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return;
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/* Force close aggregation */
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ipa_endpoint_force_close(endpoint);
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ipa_interrupt_simulate_suspend(ipa->interrupt);
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}
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/* Returns previous suspend state (true means suspend was enabled) */
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static bool
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ipa_endpoint_program_suspend(struct ipa_endpoint *endpoint, bool enable)
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{
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bool suspended;
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if (endpoint->ipa->version != IPA_VERSION_3_5_1)
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return enable; /* For IPA v4.0+, no change made */
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/* assert(!endpoint->toward_ipa); */
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suspended = ipa_endpoint_init_ctrl(endpoint, enable);
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/* A client suspended with an open aggregation frame will not
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* generate a SUSPEND IPA interrupt. If enabling suspend, have
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* ipa_endpoint_suspend_aggr() handle this.
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*/
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if (enable && !suspended)
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ipa_endpoint_suspend_aggr(endpoint);
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return suspended;
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}
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/* Enable or disable delay or suspend mode on all modem endpoints */
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void ipa_endpoint_modem_pause_all(struct ipa *ipa, bool enable)
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{
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u32 endpoint_id;
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/* DELAY mode doesn't work correctly on IPA v4.2 */
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if (ipa->version == IPA_VERSION_4_2)
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return;
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for (endpoint_id = 0; endpoint_id < IPA_ENDPOINT_MAX; endpoint_id++) {
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struct ipa_endpoint *endpoint = &ipa->endpoint[endpoint_id];
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if (endpoint->ee_id != GSI_EE_MODEM)
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continue;
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/* Set TX delay mode or RX suspend mode */
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if (endpoint->toward_ipa)
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ipa_endpoint_program_delay(endpoint, enable);
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else
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(void)ipa_endpoint_program_suspend(endpoint, enable);
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}
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}
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/* Reset all modem endpoints to use the default exception endpoint */
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int ipa_endpoint_modem_exception_reset_all(struct ipa *ipa)
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{
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u32 initialized = ipa->initialized;
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struct gsi_trans *trans;
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u32 count;
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/* We need one command per modem TX endpoint. We can get an upper
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* bound on that by assuming all initialized endpoints are modem->IPA.
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* That won't happen, and we could be more precise, but this is fine
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* for now. We need to end the transaction with a "tag process."
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*/
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count = hweight32(initialized) + ipa_cmd_tag_process_count();
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trans = ipa_cmd_trans_alloc(ipa, count);
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if (!trans) {
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dev_err(&ipa->pdev->dev,
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"no transaction to reset modem exception endpoints\n");
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return -EBUSY;
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}
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while (initialized) {
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u32 endpoint_id = __ffs(initialized);
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struct ipa_endpoint *endpoint;
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u32 offset;
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initialized ^= BIT(endpoint_id);
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/* We only reset modem TX endpoints */
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endpoint = &ipa->endpoint[endpoint_id];
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if (!(endpoint->ee_id == GSI_EE_MODEM && endpoint->toward_ipa))
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continue;
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offset = IPA_REG_ENDP_STATUS_N_OFFSET(endpoint_id);
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/* Value written is 0, and all bits are updated. That
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* means status is disabled on the endpoint, and as a
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* result all other fields in the register are ignored.
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*/
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ipa_cmd_register_write_add(trans, offset, 0, ~0, false);
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}
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ipa_cmd_tag_process_add(trans);
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/* XXX This should have a 1 second timeout */
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gsi_trans_commit_wait(trans);
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return 0;
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}
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static void ipa_endpoint_init_cfg(struct ipa_endpoint *endpoint)
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{
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u32 offset = IPA_REG_ENDP_INIT_CFG_N_OFFSET(endpoint->endpoint_id);
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u32 val = 0;
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/* FRAG_OFFLOAD_EN is 0 */
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if (endpoint->data->checksum) {
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if (endpoint->toward_ipa) {
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u32 checksum_offset;
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val |= u32_encode_bits(IPA_CS_OFFLOAD_UL,
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CS_OFFLOAD_EN_FMASK);
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/* Checksum header offset is in 4-byte units */
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checksum_offset = sizeof(struct rmnet_map_header);
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checksum_offset /= sizeof(u32);
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val |= u32_encode_bits(checksum_offset,
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CS_METADATA_HDR_OFFSET_FMASK);
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} else {
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val |= u32_encode_bits(IPA_CS_OFFLOAD_DL,
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CS_OFFLOAD_EN_FMASK);
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}
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} else {
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val |= u32_encode_bits(IPA_CS_OFFLOAD_NONE,
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CS_OFFLOAD_EN_FMASK);
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}
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/* CS_GEN_QMB_MASTER_SEL is 0 */
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iowrite32(val, endpoint->ipa->reg_virt + offset);
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}
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/**
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* ipa_endpoint_init_hdr() - Initialize HDR endpoint configuration register
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* @endpoint: Endpoint pointer
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*
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* We program QMAP endpoints so each packet received is preceded by a QMAP
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* header structure. The QMAP header contains a 1-byte mux_id and 2-byte
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* packet size field, and we have the IPA hardware populate both for each
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* received packet. The header is configured (in the HDR_EXT register)
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* to use big endian format.
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*
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* The packet size is written into the QMAP header's pkt_len field. That
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* location is defined here using the HDR_OFST_PKT_SIZE field.
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*
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* The mux_id comes from a 4-byte metadata value supplied with each packet
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* by the modem. It is *not* a QMAP header, but it does contain the mux_id
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* value that we want, in its low-order byte. A bitmask defined in the
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* endpoint's METADATA_MASK register defines which byte within the modem
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* metadata contains the mux_id. And the OFST_METADATA field programmed
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* here indicates where the extracted byte should be placed within the QMAP
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* header.
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*/
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static void ipa_endpoint_init_hdr(struct ipa_endpoint *endpoint)
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{
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u32 offset = IPA_REG_ENDP_INIT_HDR_N_OFFSET(endpoint->endpoint_id);
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u32 val = 0;
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if (endpoint->data->qmap) {
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size_t header_size = sizeof(struct rmnet_map_header);
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|
/* We might supply a checksum header after the QMAP header */
|
|
if (endpoint->toward_ipa && endpoint->data->checksum)
|
|
header_size += sizeof(struct rmnet_map_ul_csum_header);
|
|
val |= u32_encode_bits(header_size, HDR_LEN_FMASK);
|
|
|
|
/* Define how to fill fields in a received QMAP header */
|
|
if (!endpoint->toward_ipa) {
|
|
u32 off; /* Field offset within header */
|
|
|
|
/* Where IPA will write the metadata value */
|
|
off = offsetof(struct rmnet_map_header, mux_id);
|
|
val |= u32_encode_bits(off, HDR_OFST_METADATA_FMASK);
|
|
|
|
/* Where IPA will write the length */
|
|
off = offsetof(struct rmnet_map_header, pkt_len);
|
|
val |= HDR_OFST_PKT_SIZE_VALID_FMASK;
|
|
val |= u32_encode_bits(off, HDR_OFST_PKT_SIZE_FMASK);
|
|
}
|
|
/* For QMAP TX, metadata offset is 0 (modem assumes this) */
|
|
val |= HDR_OFST_METADATA_VALID_FMASK;
|
|
|
|
/* HDR_ADDITIONAL_CONST_LEN is 0; (RX only) */
|
|
/* HDR_A5_MUX is 0 */
|
|
/* HDR_LEN_INC_DEAGG_HDR is 0 */
|
|
/* HDR_METADATA_REG_VALID is 0 (TX only) */
|
|
}
|
|
|
|
iowrite32(val, endpoint->ipa->reg_virt + offset);
|
|
}
|
|
|
|
static void ipa_endpoint_init_hdr_ext(struct ipa_endpoint *endpoint)
|
|
{
|
|
u32 offset = IPA_REG_ENDP_INIT_HDR_EXT_N_OFFSET(endpoint->endpoint_id);
|
|
u32 pad_align = endpoint->data->rx.pad_align;
|
|
u32 val = 0;
|
|
|
|
val |= HDR_ENDIANNESS_FMASK; /* big endian */
|
|
|
|
/* A QMAP header contains a 6 bit pad field at offset 0. The RMNet
|
|
* driver assumes this field is meaningful in packets it receives,
|
|
* and assumes the header's payload length includes that padding.
|
|
* The RMNet driver does *not* pad packets it sends, however, so
|
|
* the pad field (although 0) should be ignored.
|
|
*/
|
|
if (endpoint->data->qmap && !endpoint->toward_ipa) {
|
|
val |= HDR_TOTAL_LEN_OR_PAD_VALID_FMASK;
|
|
/* HDR_TOTAL_LEN_OR_PAD is 0 (pad, not total_len) */
|
|
val |= HDR_PAYLOAD_LEN_INC_PADDING_FMASK;
|
|
/* HDR_TOTAL_LEN_OR_PAD_OFFSET is 0 */
|
|
}
|
|
|
|
/* HDR_PAYLOAD_LEN_INC_PADDING is 0 */
|
|
if (!endpoint->toward_ipa)
|
|
val |= u32_encode_bits(pad_align, HDR_PAD_TO_ALIGNMENT_FMASK);
|
|
|
|
iowrite32(val, endpoint->ipa->reg_virt + offset);
|
|
}
|
|
|
|
|
|
static void ipa_endpoint_init_hdr_metadata_mask(struct ipa_endpoint *endpoint)
|
|
{
|
|
u32 endpoint_id = endpoint->endpoint_id;
|
|
u32 val = 0;
|
|
u32 offset;
|
|
|
|
if (endpoint->toward_ipa)
|
|
return; /* Register not valid for TX endpoints */
|
|
|
|
offset = IPA_REG_ENDP_INIT_HDR_METADATA_MASK_N_OFFSET(endpoint_id);
|
|
|
|
/* Note that HDR_ENDIANNESS indicates big endian header fields */
|
|
if (endpoint->data->qmap)
|
|
val = cpu_to_be32(IPA_ENDPOINT_QMAP_METADATA_MASK);
|
|
|
|
iowrite32(val, endpoint->ipa->reg_virt + offset);
|
|
}
|
|
|
|
static void ipa_endpoint_init_mode(struct ipa_endpoint *endpoint)
|
|
{
|
|
u32 offset = IPA_REG_ENDP_INIT_MODE_N_OFFSET(endpoint->endpoint_id);
|
|
u32 val;
|
|
|
|
if (!endpoint->toward_ipa)
|
|
return; /* Register not valid for RX endpoints */
|
|
|
|
if (endpoint->data->dma_mode) {
|
|
enum ipa_endpoint_name name = endpoint->data->dma_endpoint;
|
|
u32 dma_endpoint_id;
|
|
|
|
dma_endpoint_id = endpoint->ipa->name_map[name]->endpoint_id;
|
|
|
|
val = u32_encode_bits(IPA_DMA, MODE_FMASK);
|
|
val |= u32_encode_bits(dma_endpoint_id, DEST_PIPE_INDEX_FMASK);
|
|
} else {
|
|
val = u32_encode_bits(IPA_BASIC, MODE_FMASK);
|
|
}
|
|
/* All other bits unspecified (and 0) */
|
|
|
|
iowrite32(val, endpoint->ipa->reg_virt + offset);
|
|
}
|
|
|
|
/* Compute the aggregation size value to use for a given buffer size */
|
|
static u32 ipa_aggr_size_kb(u32 rx_buffer_size)
|
|
{
|
|
/* We don't use "hard byte limit" aggregation, so we define the
|
|
* aggregation limit such that our buffer has enough space *after*
|
|
* that limit to receive a full MTU of data, plus overhead.
|
|
*/
|
|
rx_buffer_size -= IPA_MTU + IPA_RX_BUFFER_OVERHEAD;
|
|
|
|
return rx_buffer_size / SZ_1K;
|
|
}
|
|
|
|
static void ipa_endpoint_init_aggr(struct ipa_endpoint *endpoint)
|
|
{
|
|
u32 offset = IPA_REG_ENDP_INIT_AGGR_N_OFFSET(endpoint->endpoint_id);
|
|
u32 val = 0;
|
|
|
|
if (endpoint->data->aggregation) {
|
|
if (!endpoint->toward_ipa) {
|
|
u32 limit;
|
|
|
|
val |= u32_encode_bits(IPA_ENABLE_AGGR, AGGR_EN_FMASK);
|
|
val |= u32_encode_bits(IPA_GENERIC, AGGR_TYPE_FMASK);
|
|
|
|
limit = ipa_aggr_size_kb(IPA_RX_BUFFER_SIZE);
|
|
val |= u32_encode_bits(limit, AGGR_BYTE_LIMIT_FMASK);
|
|
|
|
limit = IPA_AGGR_TIME_LIMIT_DEFAULT;
|
|
limit = DIV_ROUND_CLOSEST(limit, IPA_AGGR_GRANULARITY);
|
|
val |= u32_encode_bits(limit, AGGR_TIME_LIMIT_FMASK);
|
|
|
|
/* AGGR_PKT_LIMIT is 0 (unlimited) */
|
|
|
|
if (endpoint->data->rx.aggr_close_eof)
|
|
val |= AGGR_SW_EOF_ACTIVE_FMASK;
|
|
/* AGGR_HARD_BYTE_LIMIT_ENABLE is 0 */
|
|
} else {
|
|
val |= u32_encode_bits(IPA_ENABLE_DEAGGR,
|
|
AGGR_EN_FMASK);
|
|
val |= u32_encode_bits(IPA_QCMAP, AGGR_TYPE_FMASK);
|
|
/* other fields ignored */
|
|
}
|
|
/* AGGR_FORCE_CLOSE is 0 */
|
|
} else {
|
|
val |= u32_encode_bits(IPA_BYPASS_AGGR, AGGR_EN_FMASK);
|
|
/* other fields ignored */
|
|
}
|
|
|
|
iowrite32(val, endpoint->ipa->reg_virt + offset);
|
|
}
|
|
|
|
/* The head-of-line blocking timer is defined as a tick count, where each
|
|
* tick represents 128 cycles of the IPA core clock. Return the value
|
|
* that should be written to that register that represents the timeout
|
|
* period provided.
|
|
*/
|
|
static u32 ipa_reg_init_hol_block_timer_val(struct ipa *ipa, u32 microseconds)
|
|
{
|
|
u32 width;
|
|
u32 scale;
|
|
u64 ticks;
|
|
u64 rate;
|
|
u32 high;
|
|
u32 val;
|
|
|
|
if (!microseconds)
|
|
return 0; /* Nothing to compute if timer period is 0 */
|
|
|
|
/* Use 64 bit arithmetic to avoid overflow... */
|
|
rate = ipa_clock_rate(ipa);
|
|
ticks = DIV_ROUND_CLOSEST(microseconds * rate, 128 * USEC_PER_SEC);
|
|
/* ...but we still need to fit into a 32-bit register */
|
|
WARN_ON(ticks > U32_MAX);
|
|
|
|
/* IPA v3.5.1 just records the tick count */
|
|
if (ipa->version == IPA_VERSION_3_5_1)
|
|
return (u32)ticks;
|
|
|
|
/* For IPA v4.2, the tick count is represented by base and
|
|
* scale fields within the 32-bit timer register, where:
|
|
* ticks = base << scale;
|
|
* The best precision is achieved when the base value is as
|
|
* large as possible. Find the highest set bit in the tick
|
|
* count, and extract the number of bits in the base field
|
|
* such that that high bit is included.
|
|
*/
|
|
high = fls(ticks); /* 1..32 */
|
|
width = HWEIGHT32(BASE_VALUE_FMASK);
|
|
scale = high > width ? high - width : 0;
|
|
if (scale) {
|
|
/* If we're scaling, round up to get a closer result */
|
|
ticks += 1 << (scale - 1);
|
|
/* High bit was set, so rounding might have affected it */
|
|
if (fls(ticks) != high)
|
|
scale++;
|
|
}
|
|
|
|
val = u32_encode_bits(scale, SCALE_FMASK);
|
|
val |= u32_encode_bits(ticks >> scale, BASE_VALUE_FMASK);
|
|
|
|
return val;
|
|
}
|
|
|
|
/* If microseconds is 0, timeout is immediate */
|
|
static void ipa_endpoint_init_hol_block_timer(struct ipa_endpoint *endpoint,
|
|
u32 microseconds)
|
|
{
|
|
u32 endpoint_id = endpoint->endpoint_id;
|
|
struct ipa *ipa = endpoint->ipa;
|
|
u32 offset;
|
|
u32 val;
|
|
|
|
offset = IPA_REG_ENDP_INIT_HOL_BLOCK_TIMER_N_OFFSET(endpoint_id);
|
|
val = ipa_reg_init_hol_block_timer_val(ipa, microseconds);
|
|
iowrite32(val, ipa->reg_virt + offset);
|
|
}
|
|
|
|
static void
|
|
ipa_endpoint_init_hol_block_enable(struct ipa_endpoint *endpoint, bool enable)
|
|
{
|
|
u32 endpoint_id = endpoint->endpoint_id;
|
|
u32 offset;
|
|
u32 val;
|
|
|
|
val = enable ? HOL_BLOCK_EN_FMASK : 0;
|
|
offset = IPA_REG_ENDP_INIT_HOL_BLOCK_EN_N_OFFSET(endpoint_id);
|
|
iowrite32(val, endpoint->ipa->reg_virt + offset);
|
|
}
|
|
|
|
void ipa_endpoint_modem_hol_block_clear_all(struct ipa *ipa)
|
|
{
|
|
u32 i;
|
|
|
|
for (i = 0; i < IPA_ENDPOINT_MAX; i++) {
|
|
struct ipa_endpoint *endpoint = &ipa->endpoint[i];
|
|
|
|
if (endpoint->toward_ipa || endpoint->ee_id != GSI_EE_MODEM)
|
|
continue;
|
|
|
|
ipa_endpoint_init_hol_block_timer(endpoint, 0);
|
|
ipa_endpoint_init_hol_block_enable(endpoint, true);
|
|
}
|
|
}
|
|
|
|
static void ipa_endpoint_init_deaggr(struct ipa_endpoint *endpoint)
|
|
{
|
|
u32 offset = IPA_REG_ENDP_INIT_DEAGGR_N_OFFSET(endpoint->endpoint_id);
|
|
u32 val = 0;
|
|
|
|
if (!endpoint->toward_ipa)
|
|
return; /* Register not valid for RX endpoints */
|
|
|
|
/* DEAGGR_HDR_LEN is 0 */
|
|
/* PACKET_OFFSET_VALID is 0 */
|
|
/* PACKET_OFFSET_LOCATION is ignored (not valid) */
|
|
/* MAX_PACKET_LEN is 0 (not enforced) */
|
|
|
|
iowrite32(val, endpoint->ipa->reg_virt + offset);
|
|
}
|
|
|
|
static void ipa_endpoint_init_seq(struct ipa_endpoint *endpoint)
|
|
{
|
|
u32 offset = IPA_REG_ENDP_INIT_SEQ_N_OFFSET(endpoint->endpoint_id);
|
|
u32 seq_type = endpoint->seq_type;
|
|
u32 val = 0;
|
|
|
|
if (!endpoint->toward_ipa)
|
|
return; /* Register not valid for RX endpoints */
|
|
|
|
/* Sequencer type is made up of four nibbles */
|
|
val |= u32_encode_bits(seq_type & 0xf, HPS_SEQ_TYPE_FMASK);
|
|
val |= u32_encode_bits((seq_type >> 4) & 0xf, DPS_SEQ_TYPE_FMASK);
|
|
/* The second two apply to replicated packets */
|
|
val |= u32_encode_bits((seq_type >> 8) & 0xf, HPS_REP_SEQ_TYPE_FMASK);
|
|
val |= u32_encode_bits((seq_type >> 12) & 0xf, DPS_REP_SEQ_TYPE_FMASK);
|
|
|
|
iowrite32(val, endpoint->ipa->reg_virt + offset);
|
|
}
|
|
|
|
/**
|
|
* ipa_endpoint_skb_tx() - Transmit a socket buffer
|
|
* @endpoint: Endpoint pointer
|
|
* @skb: Socket buffer to send
|
|
*
|
|
* Returns: 0 if successful, or a negative error code
|
|
*/
|
|
int ipa_endpoint_skb_tx(struct ipa_endpoint *endpoint, struct sk_buff *skb)
|
|
{
|
|
struct gsi_trans *trans;
|
|
u32 nr_frags;
|
|
int ret;
|
|
|
|
/* Make sure source endpoint's TLV FIFO has enough entries to
|
|
* hold the linear portion of the skb and all its fragments.
|
|
* If not, see if we can linearize it before giving up.
|
|
*/
|
|
nr_frags = skb_shinfo(skb)->nr_frags;
|
|
if (1 + nr_frags > endpoint->trans_tre_max) {
|
|
if (skb_linearize(skb))
|
|
return -E2BIG;
|
|
nr_frags = 0;
|
|
}
|
|
|
|
trans = ipa_endpoint_trans_alloc(endpoint, 1 + nr_frags);
|
|
if (!trans)
|
|
return -EBUSY;
|
|
|
|
ret = gsi_trans_skb_add(trans, skb);
|
|
if (ret)
|
|
goto err_trans_free;
|
|
trans->data = skb; /* transaction owns skb now */
|
|
|
|
gsi_trans_commit(trans, !netdev_xmit_more());
|
|
|
|
return 0;
|
|
|
|
err_trans_free:
|
|
gsi_trans_free(trans);
|
|
|
|
return -ENOMEM;
|
|
}
|
|
|
|
static void ipa_endpoint_status(struct ipa_endpoint *endpoint)
|
|
{
|
|
u32 endpoint_id = endpoint->endpoint_id;
|
|
struct ipa *ipa = endpoint->ipa;
|
|
u32 val = 0;
|
|
u32 offset;
|
|
|
|
offset = IPA_REG_ENDP_STATUS_N_OFFSET(endpoint_id);
|
|
|
|
if (endpoint->data->status_enable) {
|
|
val |= STATUS_EN_FMASK;
|
|
if (endpoint->toward_ipa) {
|
|
enum ipa_endpoint_name name;
|
|
u32 status_endpoint_id;
|
|
|
|
name = endpoint->data->tx.status_endpoint;
|
|
status_endpoint_id = ipa->name_map[name]->endpoint_id;
|
|
|
|
val |= u32_encode_bits(status_endpoint_id,
|
|
STATUS_ENDP_FMASK);
|
|
}
|
|
/* STATUS_LOCATION is 0 (status element precedes packet) */
|
|
/* The next field is present for IPA v4.0 and above */
|
|
/* STATUS_PKT_SUPPRESS_FMASK is 0 */
|
|
}
|
|
|
|
iowrite32(val, ipa->reg_virt + offset);
|
|
}
|
|
|
|
static int ipa_endpoint_replenish_one(struct ipa_endpoint *endpoint)
|
|
{
|
|
struct gsi_trans *trans;
|
|
bool doorbell = false;
|
|
struct page *page;
|
|
u32 offset;
|
|
u32 len;
|
|
int ret;
|
|
|
|
page = dev_alloc_pages(get_order(IPA_RX_BUFFER_SIZE));
|
|
if (!page)
|
|
return -ENOMEM;
|
|
|
|
trans = ipa_endpoint_trans_alloc(endpoint, 1);
|
|
if (!trans)
|
|
goto err_free_pages;
|
|
|
|
/* Offset the buffer to make space for skb headroom */
|
|
offset = NET_SKB_PAD;
|
|
len = IPA_RX_BUFFER_SIZE - offset;
|
|
|
|
ret = gsi_trans_page_add(trans, page, len, offset);
|
|
if (ret)
|
|
goto err_trans_free;
|
|
trans->data = page; /* transaction owns page now */
|
|
|
|
if (++endpoint->replenish_ready == IPA_REPLENISH_BATCH) {
|
|
doorbell = true;
|
|
endpoint->replenish_ready = 0;
|
|
}
|
|
|
|
gsi_trans_commit(trans, doorbell);
|
|
|
|
return 0;
|
|
|
|
err_trans_free:
|
|
gsi_trans_free(trans);
|
|
err_free_pages:
|
|
__free_pages(page, get_order(IPA_RX_BUFFER_SIZE));
|
|
|
|
return -ENOMEM;
|
|
}
|
|
|
|
/**
|
|
* ipa_endpoint_replenish() - Replenish the Rx packets cache.
|
|
* @endpoint: Endpoint to be replenished
|
|
* @count: Number of buffers to send to hardware
|
|
*
|
|
* Allocate RX packet wrapper structures with maximal socket buffers
|
|
* for an endpoint. These are supplied to the hardware, which fills
|
|
* them with incoming data.
|
|
*/
|
|
static void ipa_endpoint_replenish(struct ipa_endpoint *endpoint, u32 count)
|
|
{
|
|
struct gsi *gsi;
|
|
u32 backlog;
|
|
|
|
if (!endpoint->replenish_enabled) {
|
|
if (count)
|
|
atomic_add(count, &endpoint->replenish_saved);
|
|
return;
|
|
}
|
|
|
|
|
|
while (atomic_dec_not_zero(&endpoint->replenish_backlog))
|
|
if (ipa_endpoint_replenish_one(endpoint))
|
|
goto try_again_later;
|
|
if (count)
|
|
atomic_add(count, &endpoint->replenish_backlog);
|
|
|
|
return;
|
|
|
|
try_again_later:
|
|
/* The last one didn't succeed, so fix the backlog */
|
|
backlog = atomic_inc_return(&endpoint->replenish_backlog);
|
|
|
|
if (count)
|
|
atomic_add(count, &endpoint->replenish_backlog);
|
|
|
|
/* Whenever a receive buffer transaction completes we'll try to
|
|
* replenish again. It's unlikely, but if we fail to supply even
|
|
* one buffer, nothing will trigger another replenish attempt.
|
|
* Receive buffer transactions use one TRE, so schedule work to
|
|
* try replenishing again if our backlog is *all* available TREs.
|
|
*/
|
|
gsi = &endpoint->ipa->gsi;
|
|
if (backlog == gsi_channel_tre_max(gsi, endpoint->channel_id))
|
|
schedule_delayed_work(&endpoint->replenish_work,
|
|
msecs_to_jiffies(1));
|
|
}
|
|
|
|
static void ipa_endpoint_replenish_enable(struct ipa_endpoint *endpoint)
|
|
{
|
|
struct gsi *gsi = &endpoint->ipa->gsi;
|
|
u32 max_backlog;
|
|
u32 saved;
|
|
|
|
endpoint->replenish_enabled = true;
|
|
while ((saved = atomic_xchg(&endpoint->replenish_saved, 0)))
|
|
atomic_add(saved, &endpoint->replenish_backlog);
|
|
|
|
/* Start replenishing if hardware currently has no buffers */
|
|
max_backlog = gsi_channel_tre_max(gsi, endpoint->channel_id);
|
|
if (atomic_read(&endpoint->replenish_backlog) == max_backlog)
|
|
ipa_endpoint_replenish(endpoint, 0);
|
|
}
|
|
|
|
static void ipa_endpoint_replenish_disable(struct ipa_endpoint *endpoint)
|
|
{
|
|
u32 backlog;
|
|
|
|
endpoint->replenish_enabled = false;
|
|
while ((backlog = atomic_xchg(&endpoint->replenish_backlog, 0)))
|
|
atomic_add(backlog, &endpoint->replenish_saved);
|
|
}
|
|
|
|
static void ipa_endpoint_replenish_work(struct work_struct *work)
|
|
{
|
|
struct delayed_work *dwork = to_delayed_work(work);
|
|
struct ipa_endpoint *endpoint;
|
|
|
|
endpoint = container_of(dwork, struct ipa_endpoint, replenish_work);
|
|
|
|
ipa_endpoint_replenish(endpoint, 0);
|
|
}
|
|
|
|
static void ipa_endpoint_skb_copy(struct ipa_endpoint *endpoint,
|
|
void *data, u32 len, u32 extra)
|
|
{
|
|
struct sk_buff *skb;
|
|
|
|
skb = __dev_alloc_skb(len, GFP_ATOMIC);
|
|
if (skb) {
|
|
skb_put(skb, len);
|
|
memcpy(skb->data, data, len);
|
|
skb->truesize += extra;
|
|
}
|
|
|
|
/* Now receive it, or drop it if there's no netdev */
|
|
if (endpoint->netdev)
|
|
ipa_modem_skb_rx(endpoint->netdev, skb);
|
|
else if (skb)
|
|
dev_kfree_skb_any(skb);
|
|
}
|
|
|
|
static bool ipa_endpoint_skb_build(struct ipa_endpoint *endpoint,
|
|
struct page *page, u32 len)
|
|
{
|
|
struct sk_buff *skb;
|
|
|
|
/* Nothing to do if there's no netdev */
|
|
if (!endpoint->netdev)
|
|
return false;
|
|
|
|
/* assert(len <= SKB_WITH_OVERHEAD(IPA_RX_BUFFER_SIZE-NET_SKB_PAD)); */
|
|
skb = build_skb(page_address(page), IPA_RX_BUFFER_SIZE);
|
|
if (skb) {
|
|
/* Reserve the headroom and account for the data */
|
|
skb_reserve(skb, NET_SKB_PAD);
|
|
skb_put(skb, len);
|
|
}
|
|
|
|
/* Receive the buffer (or record drop if unable to build it) */
|
|
ipa_modem_skb_rx(endpoint->netdev, skb);
|
|
|
|
return skb != NULL;
|
|
}
|
|
|
|
/* The format of a packet status element is the same for several status
|
|
* types (opcodes). Other types aren't currently supported.
|
|
*/
|
|
static bool ipa_status_format_packet(enum ipa_status_opcode opcode)
|
|
{
|
|
switch (opcode) {
|
|
case IPA_STATUS_OPCODE_PACKET:
|
|
case IPA_STATUS_OPCODE_DROPPED_PACKET:
|
|
case IPA_STATUS_OPCODE_SUSPENDED_PACKET:
|
|
case IPA_STATUS_OPCODE_PACKET_2ND_PASS:
|
|
return true;
|
|
default:
|
|
return false;
|
|
}
|
|
}
|
|
|
|
static bool ipa_endpoint_status_skip(struct ipa_endpoint *endpoint,
|
|
const struct ipa_status *status)
|
|
{
|
|
u32 endpoint_id;
|
|
|
|
if (!ipa_status_format_packet(status->opcode))
|
|
return true;
|
|
if (!status->pkt_len)
|
|
return true;
|
|
endpoint_id = u32_get_bits(status->endp_dst_idx,
|
|
IPA_STATUS_DST_IDX_FMASK);
|
|
if (endpoint_id != endpoint->endpoint_id)
|
|
return true;
|
|
|
|
return false; /* Don't skip this packet, process it */
|
|
}
|
|
|
|
/* Return whether the status indicates the packet should be dropped */
|
|
static bool ipa_status_drop_packet(const struct ipa_status *status)
|
|
{
|
|
u32 val;
|
|
|
|
/* Deaggregation exceptions we drop; all other types we consume */
|
|
if (status->exception)
|
|
return status->exception == IPA_STATUS_EXCEPTION_DEAGGR;
|
|
|
|
/* Drop the packet if it fails to match a routing rule; otherwise no */
|
|
val = le32_get_bits(status->flags1, IPA_STATUS_FLAGS1_RT_RULE_ID_FMASK);
|
|
|
|
return val == field_max(IPA_STATUS_FLAGS1_RT_RULE_ID_FMASK);
|
|
}
|
|
|
|
static void ipa_endpoint_status_parse(struct ipa_endpoint *endpoint,
|
|
struct page *page, u32 total_len)
|
|
{
|
|
void *data = page_address(page) + NET_SKB_PAD;
|
|
u32 unused = IPA_RX_BUFFER_SIZE - total_len;
|
|
u32 resid = total_len;
|
|
|
|
while (resid) {
|
|
const struct ipa_status *status = data;
|
|
u32 align;
|
|
u32 len;
|
|
|
|
if (resid < sizeof(*status)) {
|
|
dev_err(&endpoint->ipa->pdev->dev,
|
|
"short message (%u bytes < %zu byte status)\n",
|
|
resid, sizeof(*status));
|
|
break;
|
|
}
|
|
|
|
/* Skip over status packets that lack packet data */
|
|
if (ipa_endpoint_status_skip(endpoint, status)) {
|
|
data += sizeof(*status);
|
|
resid -= sizeof(*status);
|
|
continue;
|
|
}
|
|
|
|
/* Compute the amount of buffer space consumed by the
|
|
* packet, including the status element. If the hardware
|
|
* is configured to pad packet data to an aligned boundary,
|
|
* account for that. And if checksum offload is is enabled
|
|
* a trailer containing computed checksum information will
|
|
* be appended.
|
|
*/
|
|
align = endpoint->data->rx.pad_align ? : 1;
|
|
len = le16_to_cpu(status->pkt_len);
|
|
len = sizeof(*status) + ALIGN(len, align);
|
|
if (endpoint->data->checksum)
|
|
len += sizeof(struct rmnet_map_dl_csum_trailer);
|
|
|
|
/* Charge the new packet with a proportional fraction of
|
|
* the unused space in the original receive buffer.
|
|
* XXX Charge a proportion of the *whole* receive buffer?
|
|
*/
|
|
if (!ipa_status_drop_packet(status)) {
|
|
u32 extra = unused * len / total_len;
|
|
void *data2 = data + sizeof(*status);
|
|
u32 len2 = le16_to_cpu(status->pkt_len);
|
|
|
|
/* Client receives only packet data (no status) */
|
|
ipa_endpoint_skb_copy(endpoint, data2, len2, extra);
|
|
}
|
|
|
|
/* Consume status and the full packet it describes */
|
|
data += len;
|
|
resid -= len;
|
|
}
|
|
}
|
|
|
|
/* Complete a TX transaction, command or from ipa_endpoint_skb_tx() */
|
|
static void ipa_endpoint_tx_complete(struct ipa_endpoint *endpoint,
|
|
struct gsi_trans *trans)
|
|
{
|
|
}
|
|
|
|
/* Complete transaction initiated in ipa_endpoint_replenish_one() */
|
|
static void ipa_endpoint_rx_complete(struct ipa_endpoint *endpoint,
|
|
struct gsi_trans *trans)
|
|
{
|
|
struct page *page;
|
|
|
|
ipa_endpoint_replenish(endpoint, 1);
|
|
|
|
if (trans->cancelled)
|
|
return;
|
|
|
|
/* Parse or build a socket buffer using the actual received length */
|
|
page = trans->data;
|
|
if (endpoint->data->status_enable)
|
|
ipa_endpoint_status_parse(endpoint, page, trans->len);
|
|
else if (ipa_endpoint_skb_build(endpoint, page, trans->len))
|
|
trans->data = NULL; /* Pages have been consumed */
|
|
}
|
|
|
|
void ipa_endpoint_trans_complete(struct ipa_endpoint *endpoint,
|
|
struct gsi_trans *trans)
|
|
{
|
|
if (endpoint->toward_ipa)
|
|
ipa_endpoint_tx_complete(endpoint, trans);
|
|
else
|
|
ipa_endpoint_rx_complete(endpoint, trans);
|
|
}
|
|
|
|
void ipa_endpoint_trans_release(struct ipa_endpoint *endpoint,
|
|
struct gsi_trans *trans)
|
|
{
|
|
if (endpoint->toward_ipa) {
|
|
struct ipa *ipa = endpoint->ipa;
|
|
|
|
/* Nothing to do for command transactions */
|
|
if (endpoint != ipa->name_map[IPA_ENDPOINT_AP_COMMAND_TX]) {
|
|
struct sk_buff *skb = trans->data;
|
|
|
|
if (skb)
|
|
dev_kfree_skb_any(skb);
|
|
}
|
|
} else {
|
|
struct page *page = trans->data;
|
|
|
|
if (page)
|
|
__free_pages(page, get_order(IPA_RX_BUFFER_SIZE));
|
|
}
|
|
}
|
|
|
|
void ipa_endpoint_default_route_set(struct ipa *ipa, u32 endpoint_id)
|
|
{
|
|
u32 val;
|
|
|
|
/* ROUTE_DIS is 0 */
|
|
val = u32_encode_bits(endpoint_id, ROUTE_DEF_PIPE_FMASK);
|
|
val |= ROUTE_DEF_HDR_TABLE_FMASK;
|
|
val |= u32_encode_bits(0, ROUTE_DEF_HDR_OFST_FMASK);
|
|
val |= u32_encode_bits(endpoint_id, ROUTE_FRAG_DEF_PIPE_FMASK);
|
|
val |= ROUTE_DEF_RETAIN_HDR_FMASK;
|
|
|
|
iowrite32(val, ipa->reg_virt + IPA_REG_ROUTE_OFFSET);
|
|
}
|
|
|
|
void ipa_endpoint_default_route_clear(struct ipa *ipa)
|
|
{
|
|
ipa_endpoint_default_route_set(ipa, 0);
|
|
}
|
|
|
|
/**
|
|
* ipa_endpoint_reset_rx_aggr() - Reset RX endpoint with aggregation active
|
|
* @endpoint: Endpoint to be reset
|
|
*
|
|
* If aggregation is active on an RX endpoint when a reset is performed
|
|
* on its underlying GSI channel, a special sequence of actions must be
|
|
* taken to ensure the IPA pipeline is properly cleared.
|
|
*
|
|
* Return: 0 if successful, or a negative error code
|
|
*/
|
|
static int ipa_endpoint_reset_rx_aggr(struct ipa_endpoint *endpoint)
|
|
{
|
|
struct device *dev = &endpoint->ipa->pdev->dev;
|
|
struct ipa *ipa = endpoint->ipa;
|
|
struct gsi *gsi = &ipa->gsi;
|
|
bool suspended = false;
|
|
dma_addr_t addr;
|
|
bool legacy;
|
|
u32 retries;
|
|
u32 len = 1;
|
|
void *virt;
|
|
int ret;
|
|
|
|
virt = kzalloc(len, GFP_KERNEL);
|
|
if (!virt)
|
|
return -ENOMEM;
|
|
|
|
addr = dma_map_single(dev, virt, len, DMA_FROM_DEVICE);
|
|
if (dma_mapping_error(dev, addr)) {
|
|
ret = -ENOMEM;
|
|
goto out_kfree;
|
|
}
|
|
|
|
/* Force close aggregation before issuing the reset */
|
|
ipa_endpoint_force_close(endpoint);
|
|
|
|
/* Reset and reconfigure the channel with the doorbell engine
|
|
* disabled. Then poll until we know aggregation is no longer
|
|
* active. We'll re-enable the doorbell (if appropriate) when
|
|
* we reset again below.
|
|
*/
|
|
gsi_channel_reset(gsi, endpoint->channel_id, false);
|
|
|
|
/* Make sure the channel isn't suspended */
|
|
suspended = ipa_endpoint_program_suspend(endpoint, false);
|
|
|
|
/* Start channel and do a 1 byte read */
|
|
ret = gsi_channel_start(gsi, endpoint->channel_id);
|
|
if (ret)
|
|
goto out_suspend_again;
|
|
|
|
ret = gsi_trans_read_byte(gsi, endpoint->channel_id, addr);
|
|
if (ret)
|
|
goto err_endpoint_stop;
|
|
|
|
/* Wait for aggregation to be closed on the channel */
|
|
retries = IPA_ENDPOINT_RESET_AGGR_RETRY_MAX;
|
|
do {
|
|
if (!ipa_endpoint_aggr_active(endpoint))
|
|
break;
|
|
msleep(1);
|
|
} while (retries--);
|
|
|
|
/* Check one last time */
|
|
if (ipa_endpoint_aggr_active(endpoint))
|
|
dev_err(dev, "endpoint %u still active during reset\n",
|
|
endpoint->endpoint_id);
|
|
|
|
gsi_trans_read_byte_done(gsi, endpoint->channel_id);
|
|
|
|
ret = gsi_channel_stop(gsi, endpoint->channel_id);
|
|
if (ret)
|
|
goto out_suspend_again;
|
|
|
|
/* Finally, reset and reconfigure the channel again (re-enabling the
|
|
* the doorbell engine if appropriate). Sleep for 1 millisecond to
|
|
* complete the channel reset sequence. Finish by suspending the
|
|
* channel again (if necessary).
|
|
*/
|
|
legacy = ipa->version == IPA_VERSION_3_5_1;
|
|
gsi_channel_reset(gsi, endpoint->channel_id, legacy);
|
|
|
|
msleep(1);
|
|
|
|
goto out_suspend_again;
|
|
|
|
err_endpoint_stop:
|
|
(void)gsi_channel_stop(gsi, endpoint->channel_id);
|
|
out_suspend_again:
|
|
if (suspended)
|
|
(void)ipa_endpoint_program_suspend(endpoint, true);
|
|
dma_unmap_single(dev, addr, len, DMA_FROM_DEVICE);
|
|
out_kfree:
|
|
kfree(virt);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static void ipa_endpoint_reset(struct ipa_endpoint *endpoint)
|
|
{
|
|
u32 channel_id = endpoint->channel_id;
|
|
struct ipa *ipa = endpoint->ipa;
|
|
bool special;
|
|
bool legacy;
|
|
int ret = 0;
|
|
|
|
/* On IPA v3.5.1, if an RX endpoint is reset while aggregation
|
|
* is active, we need to handle things specially to recover.
|
|
* All other cases just need to reset the underlying GSI channel.
|
|
*
|
|
* IPA v3.5.1 enables the doorbell engine. Newer versions do not.
|
|
*/
|
|
legacy = ipa->version == IPA_VERSION_3_5_1;
|
|
special = !endpoint->toward_ipa && endpoint->data->aggregation;
|
|
if (special && ipa_endpoint_aggr_active(endpoint))
|
|
ret = ipa_endpoint_reset_rx_aggr(endpoint);
|
|
else
|
|
gsi_channel_reset(&ipa->gsi, channel_id, legacy);
|
|
|
|
if (ret)
|
|
dev_err(&ipa->pdev->dev,
|
|
"error %d resetting channel %u for endpoint %u\n",
|
|
ret, endpoint->channel_id, endpoint->endpoint_id);
|
|
}
|
|
|
|
static void ipa_endpoint_program(struct ipa_endpoint *endpoint)
|
|
{
|
|
if (endpoint->toward_ipa)
|
|
ipa_endpoint_program_delay(endpoint, false);
|
|
else
|
|
(void)ipa_endpoint_program_suspend(endpoint, false);
|
|
ipa_endpoint_init_cfg(endpoint);
|
|
ipa_endpoint_init_hdr(endpoint);
|
|
ipa_endpoint_init_hdr_ext(endpoint);
|
|
ipa_endpoint_init_hdr_metadata_mask(endpoint);
|
|
ipa_endpoint_init_mode(endpoint);
|
|
ipa_endpoint_init_aggr(endpoint);
|
|
ipa_endpoint_init_deaggr(endpoint);
|
|
ipa_endpoint_init_seq(endpoint);
|
|
ipa_endpoint_status(endpoint);
|
|
}
|
|
|
|
int ipa_endpoint_enable_one(struct ipa_endpoint *endpoint)
|
|
{
|
|
struct ipa *ipa = endpoint->ipa;
|
|
struct gsi *gsi = &ipa->gsi;
|
|
int ret;
|
|
|
|
ret = gsi_channel_start(gsi, endpoint->channel_id);
|
|
if (ret) {
|
|
dev_err(&ipa->pdev->dev,
|
|
"error %d starting %cX channel %u for endpoint %u\n",
|
|
ret, endpoint->toward_ipa ? 'T' : 'R',
|
|
endpoint->channel_id, endpoint->endpoint_id);
|
|
return ret;
|
|
}
|
|
|
|
if (!endpoint->toward_ipa) {
|
|
ipa_interrupt_suspend_enable(ipa->interrupt,
|
|
endpoint->endpoint_id);
|
|
ipa_endpoint_replenish_enable(endpoint);
|
|
}
|
|
|
|
ipa->enabled |= BIT(endpoint->endpoint_id);
|
|
|
|
return 0;
|
|
}
|
|
|
|
void ipa_endpoint_disable_one(struct ipa_endpoint *endpoint)
|
|
{
|
|
u32 mask = BIT(endpoint->endpoint_id);
|
|
struct ipa *ipa = endpoint->ipa;
|
|
struct gsi *gsi = &ipa->gsi;
|
|
int ret;
|
|
|
|
if (!(ipa->enabled & mask))
|
|
return;
|
|
|
|
ipa->enabled ^= mask;
|
|
|
|
if (!endpoint->toward_ipa) {
|
|
ipa_endpoint_replenish_disable(endpoint);
|
|
ipa_interrupt_suspend_disable(ipa->interrupt,
|
|
endpoint->endpoint_id);
|
|
}
|
|
|
|
/* Note that if stop fails, the channel's state is not well-defined */
|
|
ret = gsi_channel_stop(gsi, endpoint->channel_id);
|
|
if (ret)
|
|
dev_err(&ipa->pdev->dev,
|
|
"error %d attempting to stop endpoint %u\n", ret,
|
|
endpoint->endpoint_id);
|
|
}
|
|
|
|
void ipa_endpoint_suspend_one(struct ipa_endpoint *endpoint)
|
|
{
|
|
struct device *dev = &endpoint->ipa->pdev->dev;
|
|
struct gsi *gsi = &endpoint->ipa->gsi;
|
|
bool stop_channel;
|
|
int ret;
|
|
|
|
if (!(endpoint->ipa->enabled & BIT(endpoint->endpoint_id)))
|
|
return;
|
|
|
|
if (!endpoint->toward_ipa) {
|
|
ipa_endpoint_replenish_disable(endpoint);
|
|
(void)ipa_endpoint_program_suspend(endpoint, true);
|
|
}
|
|
|
|
/* IPA v3.5.1 doesn't use channel stop for suspend */
|
|
stop_channel = endpoint->ipa->version != IPA_VERSION_3_5_1;
|
|
ret = gsi_channel_suspend(gsi, endpoint->channel_id, stop_channel);
|
|
if (ret)
|
|
dev_err(dev, "error %d suspending channel %u\n", ret,
|
|
endpoint->channel_id);
|
|
}
|
|
|
|
void ipa_endpoint_resume_one(struct ipa_endpoint *endpoint)
|
|
{
|
|
struct device *dev = &endpoint->ipa->pdev->dev;
|
|
struct gsi *gsi = &endpoint->ipa->gsi;
|
|
bool start_channel;
|
|
int ret;
|
|
|
|
if (!(endpoint->ipa->enabled & BIT(endpoint->endpoint_id)))
|
|
return;
|
|
|
|
if (!endpoint->toward_ipa)
|
|
(void)ipa_endpoint_program_suspend(endpoint, false);
|
|
|
|
/* IPA v3.5.1 doesn't use channel start for resume */
|
|
start_channel = endpoint->ipa->version != IPA_VERSION_3_5_1;
|
|
ret = gsi_channel_resume(gsi, endpoint->channel_id, start_channel);
|
|
if (ret)
|
|
dev_err(dev, "error %d resuming channel %u\n", ret,
|
|
endpoint->channel_id);
|
|
else if (!endpoint->toward_ipa)
|
|
ipa_endpoint_replenish_enable(endpoint);
|
|
}
|
|
|
|
void ipa_endpoint_suspend(struct ipa *ipa)
|
|
{
|
|
if (!ipa->setup_complete)
|
|
return;
|
|
|
|
if (ipa->modem_netdev)
|
|
ipa_modem_suspend(ipa->modem_netdev);
|
|
|
|
ipa_cmd_tag_process(ipa);
|
|
|
|
ipa_endpoint_suspend_one(ipa->name_map[IPA_ENDPOINT_AP_LAN_RX]);
|
|
ipa_endpoint_suspend_one(ipa->name_map[IPA_ENDPOINT_AP_COMMAND_TX]);
|
|
}
|
|
|
|
void ipa_endpoint_resume(struct ipa *ipa)
|
|
{
|
|
if (!ipa->setup_complete)
|
|
return;
|
|
|
|
ipa_endpoint_resume_one(ipa->name_map[IPA_ENDPOINT_AP_COMMAND_TX]);
|
|
ipa_endpoint_resume_one(ipa->name_map[IPA_ENDPOINT_AP_LAN_RX]);
|
|
|
|
if (ipa->modem_netdev)
|
|
ipa_modem_resume(ipa->modem_netdev);
|
|
}
|
|
|
|
static void ipa_endpoint_setup_one(struct ipa_endpoint *endpoint)
|
|
{
|
|
struct gsi *gsi = &endpoint->ipa->gsi;
|
|
u32 channel_id = endpoint->channel_id;
|
|
|
|
/* Only AP endpoints get set up */
|
|
if (endpoint->ee_id != GSI_EE_AP)
|
|
return;
|
|
|
|
endpoint->trans_tre_max = gsi_channel_trans_tre_max(gsi, channel_id);
|
|
if (!endpoint->toward_ipa) {
|
|
/* RX transactions require a single TRE, so the maximum
|
|
* backlog is the same as the maximum outstanding TREs.
|
|
*/
|
|
endpoint->replenish_enabled = false;
|
|
atomic_set(&endpoint->replenish_saved,
|
|
gsi_channel_tre_max(gsi, endpoint->channel_id));
|
|
atomic_set(&endpoint->replenish_backlog, 0);
|
|
INIT_DELAYED_WORK(&endpoint->replenish_work,
|
|
ipa_endpoint_replenish_work);
|
|
}
|
|
|
|
ipa_endpoint_program(endpoint);
|
|
|
|
endpoint->ipa->set_up |= BIT(endpoint->endpoint_id);
|
|
}
|
|
|
|
static void ipa_endpoint_teardown_one(struct ipa_endpoint *endpoint)
|
|
{
|
|
endpoint->ipa->set_up &= ~BIT(endpoint->endpoint_id);
|
|
|
|
if (!endpoint->toward_ipa)
|
|
cancel_delayed_work_sync(&endpoint->replenish_work);
|
|
|
|
ipa_endpoint_reset(endpoint);
|
|
}
|
|
|
|
void ipa_endpoint_setup(struct ipa *ipa)
|
|
{
|
|
u32 initialized = ipa->initialized;
|
|
|
|
ipa->set_up = 0;
|
|
while (initialized) {
|
|
u32 endpoint_id = __ffs(initialized);
|
|
|
|
initialized ^= BIT(endpoint_id);
|
|
|
|
ipa_endpoint_setup_one(&ipa->endpoint[endpoint_id]);
|
|
}
|
|
}
|
|
|
|
void ipa_endpoint_teardown(struct ipa *ipa)
|
|
{
|
|
u32 set_up = ipa->set_up;
|
|
|
|
while (set_up) {
|
|
u32 endpoint_id = __fls(set_up);
|
|
|
|
set_up ^= BIT(endpoint_id);
|
|
|
|
ipa_endpoint_teardown_one(&ipa->endpoint[endpoint_id]);
|
|
}
|
|
ipa->set_up = 0;
|
|
}
|
|
|
|
int ipa_endpoint_config(struct ipa *ipa)
|
|
{
|
|
struct device *dev = &ipa->pdev->dev;
|
|
u32 initialized;
|
|
u32 rx_base;
|
|
u32 rx_mask;
|
|
u32 tx_mask;
|
|
int ret = 0;
|
|
u32 max;
|
|
u32 val;
|
|
|
|
/* Find out about the endpoints supplied by the hardware, and ensure
|
|
* the highest one doesn't exceed the number we support.
|
|
*/
|
|
val = ioread32(ipa->reg_virt + IPA_REG_FLAVOR_0_OFFSET);
|
|
|
|
/* Our RX is an IPA producer */
|
|
rx_base = u32_get_bits(val, BAM_PROD_LOWEST_FMASK);
|
|
max = rx_base + u32_get_bits(val, BAM_MAX_PROD_PIPES_FMASK);
|
|
if (max > IPA_ENDPOINT_MAX) {
|
|
dev_err(dev, "too many endpoints (%u > %u)\n",
|
|
max, IPA_ENDPOINT_MAX);
|
|
return -EINVAL;
|
|
}
|
|
rx_mask = GENMASK(max - 1, rx_base);
|
|
|
|
/* Our TX is an IPA consumer */
|
|
max = u32_get_bits(val, BAM_MAX_CONS_PIPES_FMASK);
|
|
tx_mask = GENMASK(max - 1, 0);
|
|
|
|
ipa->available = rx_mask | tx_mask;
|
|
|
|
/* Check for initialized endpoints not supported by the hardware */
|
|
if (ipa->initialized & ~ipa->available) {
|
|
dev_err(dev, "unavailable endpoint id(s) 0x%08x\n",
|
|
ipa->initialized & ~ipa->available);
|
|
ret = -EINVAL; /* Report other errors too */
|
|
}
|
|
|
|
initialized = ipa->initialized;
|
|
while (initialized) {
|
|
u32 endpoint_id = __ffs(initialized);
|
|
struct ipa_endpoint *endpoint;
|
|
|
|
initialized ^= BIT(endpoint_id);
|
|
|
|
/* Make sure it's pointing in the right direction */
|
|
endpoint = &ipa->endpoint[endpoint_id];
|
|
if ((endpoint_id < rx_base) != !!endpoint->toward_ipa) {
|
|
dev_err(dev, "endpoint id %u wrong direction\n",
|
|
endpoint_id);
|
|
ret = -EINVAL;
|
|
}
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
void ipa_endpoint_deconfig(struct ipa *ipa)
|
|
{
|
|
ipa->available = 0; /* Nothing more to do */
|
|
}
|
|
|
|
static void ipa_endpoint_init_one(struct ipa *ipa, enum ipa_endpoint_name name,
|
|
const struct ipa_gsi_endpoint_data *data)
|
|
{
|
|
struct ipa_endpoint *endpoint;
|
|
|
|
endpoint = &ipa->endpoint[data->endpoint_id];
|
|
|
|
if (data->ee_id == GSI_EE_AP)
|
|
ipa->channel_map[data->channel_id] = endpoint;
|
|
ipa->name_map[name] = endpoint;
|
|
|
|
endpoint->ipa = ipa;
|
|
endpoint->ee_id = data->ee_id;
|
|
endpoint->seq_type = data->endpoint.seq_type;
|
|
endpoint->channel_id = data->channel_id;
|
|
endpoint->endpoint_id = data->endpoint_id;
|
|
endpoint->toward_ipa = data->toward_ipa;
|
|
endpoint->data = &data->endpoint.config;
|
|
|
|
ipa->initialized |= BIT(endpoint->endpoint_id);
|
|
}
|
|
|
|
void ipa_endpoint_exit_one(struct ipa_endpoint *endpoint)
|
|
{
|
|
endpoint->ipa->initialized &= ~BIT(endpoint->endpoint_id);
|
|
|
|
memset(endpoint, 0, sizeof(*endpoint));
|
|
}
|
|
|
|
void ipa_endpoint_exit(struct ipa *ipa)
|
|
{
|
|
u32 initialized = ipa->initialized;
|
|
|
|
while (initialized) {
|
|
u32 endpoint_id = __fls(initialized);
|
|
|
|
initialized ^= BIT(endpoint_id);
|
|
|
|
ipa_endpoint_exit_one(&ipa->endpoint[endpoint_id]);
|
|
}
|
|
memset(ipa->name_map, 0, sizeof(ipa->name_map));
|
|
memset(ipa->channel_map, 0, sizeof(ipa->channel_map));
|
|
}
|
|
|
|
/* Returns a bitmask of endpoints that support filtering, or 0 on error */
|
|
u32 ipa_endpoint_init(struct ipa *ipa, u32 count,
|
|
const struct ipa_gsi_endpoint_data *data)
|
|
{
|
|
enum ipa_endpoint_name name;
|
|
u32 filter_map;
|
|
|
|
if (!ipa_endpoint_data_valid(ipa, count, data))
|
|
return 0; /* Error */
|
|
|
|
ipa->initialized = 0;
|
|
|
|
filter_map = 0;
|
|
for (name = 0; name < count; name++, data++) {
|
|
if (ipa_gsi_endpoint_data_empty(data))
|
|
continue; /* Skip over empty slots */
|
|
|
|
ipa_endpoint_init_one(ipa, name, data);
|
|
|
|
if (data->endpoint.filter_support)
|
|
filter_map |= BIT(data->endpoint_id);
|
|
}
|
|
|
|
if (!ipa_filter_map_valid(ipa, filter_map))
|
|
goto err_endpoint_exit;
|
|
|
|
return filter_map; /* Non-zero bitmask */
|
|
|
|
err_endpoint_exit:
|
|
ipa_endpoint_exit(ipa);
|
|
|
|
return 0; /* Error */
|
|
}
|