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authorArnd Bergmann <arnd@arndb.de>2018-01-05 12:22:53 +0100
committerArnd Bergmann <arnd@arndb.de>2018-01-05 12:22:53 +0100
commit830ebd37c57709e08c1b010c26ad1659a5853ce1 (patch)
treec60b529e8b4bc09293749030d6d27b10d73a009c /drivers/soc
parent57e36159cc0eed51b37ec9a17214fc0079f75879 (diff)
parent3aa0582fdb824139630298880fbf78d4ac774d3c (diff)
Merge tag 'qcom-drivers-for-4.16' of ssh://gitolite.kernel.org/pub/scm/linux/kernel/git/agross/linux into next/drivers
Pull "Qualcomm ARM Based Driver Updates for v4.16 - Redo" from Andy Gross: * Fix error handling code in SMP2P probe * Update SMP2P to use ACPS as mailbox client * Add QMI support * Fixups for Qualcomm SCM * Fix licensing on rmtfs_mem * Correct SMSM child node lookup * Populate firmware nodes during platform init * tag 'qcom-drivers-for-4.16' of ssh://gitolite.kernel.org/pub/scm/linux/kernel/git/agross/linux: of: platform: populate /firmware/ node from of_platform_default_populate_init() soc: qcom: smp2p: Use common error handling code in qcom_smp2p_probe() soc: qcom: Introduce QMI helpers soc: qcom: Introduce QMI encoder/decoder firmware: qcom_scm: Add dependent headers to qcom_scm.h soc: qcom: smp2p: Access APCS as mailbox client soc: qcom: rmtfs_mem: add missing MODULE_DESCRIPTION/AUTHOR/LICENSE soc: qcom: smsm: fix child-node lookup firmware: qcom_scm: drop redandant of_platform_populate
Diffstat (limited to 'drivers/soc')
-rw-r--r--drivers/soc/qcom/Kconfig10
-rw-r--r--drivers/soc/qcom/Makefile2
-rw-r--r--drivers/soc/qcom/qmi_encdec.c816
-rw-r--r--drivers/soc/qcom/qmi_interface.c848
-rw-r--r--drivers/soc/qcom/rmtfs_mem.c4
-rw-r--r--drivers/soc/qcom/smp2p.c55
-rw-r--r--drivers/soc/qcom/smsm.c6
7 files changed, 1725 insertions, 16 deletions
diff --git a/drivers/soc/qcom/Kconfig b/drivers/soc/qcom/Kconfig
index b81374bb6713..e050eb83341d 100644
--- a/drivers/soc/qcom/Kconfig
+++ b/drivers/soc/qcom/Kconfig
@@ -35,6 +35,15 @@ config QCOM_PM
modes. It interface with various system drivers to put the cores in
low power modes.
+config QCOM_QMI_HELPERS
+ tristate
+ depends on ARCH_QCOM
+ help
+ Helper library for handling QMI encoded messages. QMI encoded
+ messages are used in communication between the majority of QRTR
+ clients and this helpers provide the common functionality needed for
+ doing this from a kernel driver.
+
config QCOM_RMTFS_MEM
tristate "Qualcomm Remote Filesystem memory driver"
depends on ARCH_QCOM
@@ -75,6 +84,7 @@ config QCOM_SMEM_STATE
config QCOM_SMP2P
tristate "Qualcomm Shared Memory Point to Point support"
+ depends on MAILBOX
depends on QCOM_SMEM
select QCOM_SMEM_STATE
help
diff --git a/drivers/soc/qcom/Makefile b/drivers/soc/qcom/Makefile
index 40c56f67e94a..dcebf2814e6d 100644
--- a/drivers/soc/qcom/Makefile
+++ b/drivers/soc/qcom/Makefile
@@ -3,6 +3,8 @@ obj-$(CONFIG_QCOM_GLINK_SSR) += glink_ssr.o
obj-$(CONFIG_QCOM_GSBI) += qcom_gsbi.o
obj-$(CONFIG_QCOM_MDT_LOADER) += mdt_loader.o
obj-$(CONFIG_QCOM_PM) += spm.o
+obj-$(CONFIG_QCOM_QMI_HELPERS) += qmi_helpers.o
+qmi_helpers-y += qmi_encdec.o qmi_interface.o
obj-$(CONFIG_QCOM_RMTFS_MEM) += rmtfs_mem.o
obj-$(CONFIG_QCOM_SMD_RPM) += smd-rpm.o
obj-$(CONFIG_QCOM_SMEM) += smem.o
diff --git a/drivers/soc/qcom/qmi_encdec.c b/drivers/soc/qcom/qmi_encdec.c
new file mode 100644
index 000000000000..3aaab71d1b2c
--- /dev/null
+++ b/drivers/soc/qcom/qmi_encdec.c
@@ -0,0 +1,816 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (c) 2012-2015, The Linux Foundation. All rights reserved.
+ * Copyright (C) 2017 Linaro Ltd.
+ */
+#include <linux/slab.h>
+#include <linux/uaccess.h>
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/string.h>
+#include <linux/soc/qcom/qmi.h>
+
+#define QMI_ENCDEC_ENCODE_TLV(type, length, p_dst) do { \
+ *p_dst++ = type; \
+ *p_dst++ = ((u8)((length) & 0xFF)); \
+ *p_dst++ = ((u8)(((length) >> 8) & 0xFF)); \
+} while (0)
+
+#define QMI_ENCDEC_DECODE_TLV(p_type, p_length, p_src) do { \
+ *p_type = (u8)*p_src++; \
+ *p_length = (u8)*p_src++; \
+ *p_length |= ((u8)*p_src) << 8; \
+} while (0)
+
+#define QMI_ENCDEC_ENCODE_N_BYTES(p_dst, p_src, size) \
+do { \
+ memcpy(p_dst, p_src, size); \
+ p_dst = (u8 *)p_dst + size; \
+ p_src = (u8 *)p_src + size; \
+} while (0)
+
+#define QMI_ENCDEC_DECODE_N_BYTES(p_dst, p_src, size) \
+do { \
+ memcpy(p_dst, p_src, size); \
+ p_dst = (u8 *)p_dst + size; \
+ p_src = (u8 *)p_src + size; \
+} while (0)
+
+#define UPDATE_ENCODE_VARIABLES(temp_si, buf_dst, \
+ encoded_bytes, tlv_len, encode_tlv, rc) \
+do { \
+ buf_dst = (u8 *)buf_dst + rc; \
+ encoded_bytes += rc; \
+ tlv_len += rc; \
+ temp_si = temp_si + 1; \
+ encode_tlv = 1; \
+} while (0)
+
+#define UPDATE_DECODE_VARIABLES(buf_src, decoded_bytes, rc) \
+do { \
+ buf_src = (u8 *)buf_src + rc; \
+ decoded_bytes += rc; \
+} while (0)
+
+#define TLV_LEN_SIZE sizeof(u16)
+#define TLV_TYPE_SIZE sizeof(u8)
+#define OPTIONAL_TLV_TYPE_START 0x10
+
+static int qmi_encode(struct qmi_elem_info *ei_array, void *out_buf,
+ const void *in_c_struct, u32 out_buf_len,
+ int enc_level);
+
+static int qmi_decode(struct qmi_elem_info *ei_array, void *out_c_struct,
+ const void *in_buf, u32 in_buf_len, int dec_level);
+
+/**
+ * skip_to_next_elem() - Skip to next element in the structure to be encoded
+ * @ei_array: Struct info describing the element to be skipped.
+ * @level: Depth level of encoding/decoding to identify nested structures.
+ *
+ * This function is used while encoding optional elements. If the flag
+ * corresponding to an optional element is not set, then encoding the
+ * optional element can be skipped. This function can be used to perform
+ * that operation.
+ *
+ * Return: struct info of the next element that can be encoded.
+ */
+static struct qmi_elem_info *skip_to_next_elem(struct qmi_elem_info *ei_array,
+ int level)
+{
+ struct qmi_elem_info *temp_ei = ei_array;
+ u8 tlv_type;
+
+ if (level > 1) {
+ temp_ei = temp_ei + 1;
+ } else {
+ do {
+ tlv_type = temp_ei->tlv_type;
+ temp_ei = temp_ei + 1;
+ } while (tlv_type == temp_ei->tlv_type);
+ }
+
+ return temp_ei;
+}
+
+/**
+ * qmi_calc_min_msg_len() - Calculate the minimum length of a QMI message
+ * @ei_array: Struct info array describing the structure.
+ * @level: Level to identify the depth of the nested structures.
+ *
+ * Return: Expected minimum length of the QMI message or 0 on error.
+ */
+static int qmi_calc_min_msg_len(struct qmi_elem_info *ei_array,
+ int level)
+{
+ int min_msg_len = 0;
+ struct qmi_elem_info *temp_ei = ei_array;
+
+ if (!ei_array)
+ return min_msg_len;
+
+ while (temp_ei->data_type != QMI_EOTI) {
+ /* Optional elements do not count in minimum length */
+ if (temp_ei->data_type == QMI_OPT_FLAG) {
+ temp_ei = skip_to_next_elem(temp_ei, level);
+ continue;
+ }
+
+ if (temp_ei->data_type == QMI_DATA_LEN) {
+ min_msg_len += (temp_ei->elem_size == sizeof(u8) ?
+ sizeof(u8) : sizeof(u16));
+ temp_ei++;
+ continue;
+ } else if (temp_ei->data_type == QMI_STRUCT) {
+ min_msg_len += qmi_calc_min_msg_len(temp_ei->ei_array,
+ (level + 1));
+ temp_ei++;
+ } else if (temp_ei->data_type == QMI_STRING) {
+ if (level > 1)
+ min_msg_len += temp_ei->elem_len <= U8_MAX ?
+ sizeof(u8) : sizeof(u16);
+ min_msg_len += temp_ei->elem_len * temp_ei->elem_size;
+ temp_ei++;
+ } else {
+ min_msg_len += (temp_ei->elem_len * temp_ei->elem_size);
+ temp_ei++;
+ }
+
+ /*
+ * Type & Length info. not prepended for elements in the
+ * nested structure.
+ */
+ if (level == 1)
+ min_msg_len += (TLV_TYPE_SIZE + TLV_LEN_SIZE);
+ }
+
+ return min_msg_len;
+}
+
+/**
+ * qmi_encode_basic_elem() - Encodes elements of basic/primary data type
+ * @buf_dst: Buffer to store the encoded information.
+ * @buf_src: Buffer containing the elements to be encoded.
+ * @elem_len: Number of elements, in the buf_src, to be encoded.
+ * @elem_size: Size of a single instance of the element to be encoded.
+ *
+ * This function encodes the "elem_len" number of data elements, each of
+ * size "elem_size" bytes from the source buffer "buf_src" and stores the
+ * encoded information in the destination buffer "buf_dst". The elements are
+ * of primary data type which include u8 - u64 or similar. This
+ * function returns the number of bytes of encoded information.
+ *
+ * Return: The number of bytes of encoded information.
+ */
+static int qmi_encode_basic_elem(void *buf_dst, const void *buf_src,
+ u32 elem_len, u32 elem_size)
+{
+ u32 i, rc = 0;
+
+ for (i = 0; i < elem_len; i++) {
+ QMI_ENCDEC_ENCODE_N_BYTES(buf_dst, buf_src, elem_size);
+ rc += elem_size;
+ }
+
+ return rc;
+}
+
+/**
+ * qmi_encode_struct_elem() - Encodes elements of struct data type
+ * @ei_array: Struct info array descibing the struct element.
+ * @buf_dst: Buffer to store the encoded information.
+ * @buf_src: Buffer containing the elements to be encoded.
+ * @elem_len: Number of elements, in the buf_src, to be encoded.
+ * @out_buf_len: Available space in the encode buffer.
+ * @enc_level: Depth of the nested structure from the main structure.
+ *
+ * This function encodes the "elem_len" number of struct elements, each of
+ * size "ei_array->elem_size" bytes from the source buffer "buf_src" and
+ * stores the encoded information in the destination buffer "buf_dst". The
+ * elements are of struct data type which includes any C structure. This
+ * function returns the number of bytes of encoded information.
+ *
+ * Return: The number of bytes of encoded information on success or negative
+ * errno on error.
+ */
+static int qmi_encode_struct_elem(struct qmi_elem_info *ei_array,
+ void *buf_dst, const void *buf_src,
+ u32 elem_len, u32 out_buf_len,
+ int enc_level)
+{
+ int i, rc, encoded_bytes = 0;
+ struct qmi_elem_info *temp_ei = ei_array;
+
+ for (i = 0; i < elem_len; i++) {
+ rc = qmi_encode(temp_ei->ei_array, buf_dst, buf_src,
+ out_buf_len - encoded_bytes, enc_level);
+ if (rc < 0) {
+ pr_err("%s: STRUCT Encode failure\n", __func__);
+ return rc;
+ }
+ buf_dst = buf_dst + rc;
+ buf_src = buf_src + temp_ei->elem_size;
+ encoded_bytes += rc;
+ }
+
+ return encoded_bytes;
+}
+
+/**
+ * qmi_encode_string_elem() - Encodes elements of string data type
+ * @ei_array: Struct info array descibing the string element.
+ * @buf_dst: Buffer to store the encoded information.
+ * @buf_src: Buffer containing the elements to be encoded.
+ * @out_buf_len: Available space in the encode buffer.
+ * @enc_level: Depth of the string element from the main structure.
+ *
+ * This function encodes a string element of maximum length "ei_array->elem_len"
+ * bytes from the source buffer "buf_src" and stores the encoded information in
+ * the destination buffer "buf_dst". This function returns the number of bytes
+ * of encoded information.
+ *
+ * Return: The number of bytes of encoded information on success or negative
+ * errno on error.
+ */
+static int qmi_encode_string_elem(struct qmi_elem_info *ei_array,
+ void *buf_dst, const void *buf_src,
+ u32 out_buf_len, int enc_level)
+{
+ int rc;
+ int encoded_bytes = 0;
+ struct qmi_elem_info *temp_ei = ei_array;
+ u32 string_len = 0;
+ u32 string_len_sz = 0;
+
+ string_len = strlen(buf_src);
+ string_len_sz = temp_ei->elem_len <= U8_MAX ?
+ sizeof(u8) : sizeof(u16);
+ if (string_len > temp_ei->elem_len) {
+ pr_err("%s: String to be encoded is longer - %d > %d\n",
+ __func__, string_len, temp_ei->elem_len);
+ return -EINVAL;
+ }
+
+ if (enc_level == 1) {
+ if (string_len + TLV_LEN_SIZE + TLV_TYPE_SIZE >
+ out_buf_len) {
+ pr_err("%s: Output len %d > Out Buf len %d\n",
+ __func__, string_len, out_buf_len);
+ return -ETOOSMALL;
+ }
+ } else {
+ if (string_len + string_len_sz > out_buf_len) {
+ pr_err("%s: Output len %d > Out Buf len %d\n",
+ __func__, string_len, out_buf_len);
+ return -ETOOSMALL;
+ }
+ rc = qmi_encode_basic_elem(buf_dst, &string_len,
+ 1, string_len_sz);
+ encoded_bytes += rc;
+ }
+
+ rc = qmi_encode_basic_elem(buf_dst + encoded_bytes, buf_src,
+ string_len, temp_ei->elem_size);
+ encoded_bytes += rc;
+
+ return encoded_bytes;
+}
+
+/**
+ * qmi_encode() - Core Encode Function
+ * @ei_array: Struct info array describing the structure to be encoded.
+ * @out_buf: Buffer to hold the encoded QMI message.
+ * @in_c_struct: Pointer to the C structure to be encoded.
+ * @out_buf_len: Available space in the encode buffer.
+ * @enc_level: Encode level to indicate the depth of the nested structure,
+ * within the main structure, being encoded.
+ *
+ * Return: The number of bytes of encoded information on success or negative
+ * errno on error.
+ */
+static int qmi_encode(struct qmi_elem_info *ei_array, void *out_buf,
+ const void *in_c_struct, u32 out_buf_len,
+ int enc_level)
+{
+ struct qmi_elem_info *temp_ei = ei_array;
+ u8 opt_flag_value = 0;
+ u32 data_len_value = 0, data_len_sz;
+ u8 *buf_dst = (u8 *)out_buf;
+ u8 *tlv_pointer;
+ u32 tlv_len;
+ u8 tlv_type;
+ u32 encoded_bytes = 0;
+ const void *buf_src;
+ int encode_tlv = 0;
+ int rc;
+
+ if (!ei_array)
+ return 0;
+
+ tlv_pointer = buf_dst;
+ tlv_len = 0;
+ if (enc_level == 1)
+ buf_dst = buf_dst + (TLV_LEN_SIZE + TLV_TYPE_SIZE);
+
+ while (temp_ei->data_type != QMI_EOTI) {
+ buf_src = in_c_struct + temp_ei->offset;
+ tlv_type = temp_ei->tlv_type;
+
+ if (temp_ei->array_type == NO_ARRAY) {
+ data_len_value = 1;
+ } else if (temp_ei->array_type == STATIC_ARRAY) {
+ data_len_value = temp_ei->elem_len;
+ } else if (data_len_value <= 0 ||
+ temp_ei->elem_len < data_len_value) {
+ pr_err("%s: Invalid data length\n", __func__);
+ return -EINVAL;
+ }
+
+ switch (temp_ei->data_type) {
+ case QMI_OPT_FLAG:
+ rc = qmi_encode_basic_elem(&opt_flag_value, buf_src,
+ 1, sizeof(u8));
+ if (opt_flag_value)
+ temp_ei = temp_ei + 1;
+ else
+ temp_ei = skip_to_next_elem(temp_ei, enc_level);
+ break;
+
+ case QMI_DATA_LEN:
+ memcpy(&data_len_value, buf_src, temp_ei->elem_size);
+ data_len_sz = temp_ei->elem_size == sizeof(u8) ?
+ sizeof(u8) : sizeof(u16);
+ /* Check to avoid out of range buffer access */
+ if ((data_len_sz + encoded_bytes + TLV_LEN_SIZE +
+ TLV_TYPE_SIZE) > out_buf_len) {
+ pr_err("%s: Too Small Buffer @DATA_LEN\n",
+ __func__);
+ return -ETOOSMALL;
+ }
+ rc = qmi_encode_basic_elem(buf_dst, &data_len_value,
+ 1, data_len_sz);
+ UPDATE_ENCODE_VARIABLES(temp_ei, buf_dst,
+ encoded_bytes, tlv_len,
+ encode_tlv, rc);
+ if (!data_len_value)
+ temp_ei = skip_to_next_elem(temp_ei, enc_level);
+ else
+ encode_tlv = 0;
+ break;
+
+ case QMI_UNSIGNED_1_BYTE:
+ case QMI_UNSIGNED_2_BYTE:
+ case QMI_UNSIGNED_4_BYTE:
+ case QMI_UNSIGNED_8_BYTE:
+ case QMI_SIGNED_2_BYTE_ENUM:
+ case QMI_SIGNED_4_BYTE_ENUM:
+ /* Check to avoid out of range buffer access */
+ if (((data_len_value * temp_ei->elem_size) +
+ encoded_bytes + TLV_LEN_SIZE + TLV_TYPE_SIZE) >
+ out_buf_len) {
+ pr_err("%s: Too Small Buffer @data_type:%d\n",
+ __func__, temp_ei->data_type);
+ return -ETOOSMALL;
+ }
+ rc = qmi_encode_basic_elem(buf_dst, buf_src,
+ data_len_value,
+ temp_ei->elem_size);
+ UPDATE_ENCODE_VARIABLES(temp_ei, buf_dst,
+ encoded_bytes, tlv_len,
+ encode_tlv, rc);
+ break;
+
+ case QMI_STRUCT:
+ rc = qmi_encode_struct_elem(temp_ei, buf_dst, buf_src,
+ data_len_value,
+ out_buf_len - encoded_bytes,
+ enc_level + 1);
+ if (rc < 0)
+ return rc;
+ UPDATE_ENCODE_VARIABLES(temp_ei, buf_dst,
+ encoded_bytes, tlv_len,
+ encode_tlv, rc);
+ break;
+
+ case QMI_STRING:
+ rc = qmi_encode_string_elem(temp_ei, buf_dst, buf_src,
+ out_buf_len - encoded_bytes,
+ enc_level);
+ if (rc < 0)
+ return rc;
+ UPDATE_ENCODE_VARIABLES(temp_ei, buf_dst,
+ encoded_bytes, tlv_len,
+ encode_tlv, rc);
+ break;
+ default:
+ pr_err("%s: Unrecognized data type\n", __func__);
+ return -EINVAL;
+ }
+
+ if (encode_tlv && enc_level == 1) {
+ QMI_ENCDEC_ENCODE_TLV(tlv_type, tlv_len, tlv_pointer);
+ encoded_bytes += (TLV_TYPE_SIZE + TLV_LEN_SIZE);
+ tlv_pointer = buf_dst;
+ tlv_len = 0;
+ buf_dst = buf_dst + TLV_LEN_SIZE + TLV_TYPE_SIZE;
+ encode_tlv = 0;
+ }
+ }
+
+ return encoded_bytes;
+}
+
+/**
+ * qmi_decode_basic_elem() - Decodes elements of basic/primary data type
+ * @buf_dst: Buffer to store the decoded element.
+ * @buf_src: Buffer containing the elements in QMI wire format.
+ * @elem_len: Number of elements to be decoded.
+ * @elem_size: Size of a single instance of the element to be decoded.
+ *
+ * This function decodes the "elem_len" number of elements in QMI wire format,
+ * each of size "elem_size" bytes from the source buffer "buf_src" and stores
+ * the decoded elements in the destination buffer "buf_dst". The elements are
+ * of primary data type which include u8 - u64 or similar. This
+ * function returns the number of bytes of decoded information.
+ *
+ * Return: The total size of the decoded data elements, in bytes.
+ */
+static int qmi_decode_basic_elem(void *buf_dst, const void *buf_src,
+ u32 elem_len, u32 elem_size)
+{
+ u32 i, rc = 0;
+
+ for (i = 0; i < elem_len; i++) {
+ QMI_ENCDEC_DECODE_N_BYTES(buf_dst, buf_src, elem_size);
+ rc += elem_size;
+ }
+
+ return rc;
+}
+
+/**
+ * qmi_decode_struct_elem() - Decodes elements of struct data type
+ * @ei_array: Struct info array descibing the struct element.
+ * @buf_dst: Buffer to store the decoded element.
+ * @buf_src: Buffer containing the elements in QMI wire format.
+ * @elem_len: Number of elements to be decoded.
+ * @tlv_len: Total size of the encoded inforation corresponding to
+ * this struct element.
+ * @dec_level: Depth of the nested structure from the main structure.
+ *
+ * This function decodes the "elem_len" number of elements in QMI wire format,
+ * each of size "(tlv_len/elem_len)" bytes from the source buffer "buf_src"
+ * and stores the decoded elements in the destination buffer "buf_dst". The
+ * elements are of struct data type which includes any C structure. This
+ * function returns the number of bytes of decoded information.
+ *
+ * Return: The total size of the decoded data elements on success, negative
+ * errno on error.
+ */
+static int qmi_decode_struct_elem(struct qmi_elem_info *ei_array,
+ void *buf_dst, const void *buf_src,
+ u32 elem_len, u32 tlv_len,
+ int dec_level)
+{
+ int i, rc, decoded_bytes = 0;
+ struct qmi_elem_info *temp_ei = ei_array;
+
+ for (i = 0; i < elem_len && decoded_bytes < tlv_len; i++) {
+ rc = qmi_decode(temp_ei->ei_array, buf_dst, buf_src,
+ tlv_len - decoded_bytes, dec_level);
+ if (rc < 0)
+ return rc;
+ buf_src = buf_src + rc;
+ buf_dst = buf_dst + temp_ei->elem_size;
+ decoded_bytes += rc;
+ }
+
+ if ((dec_level <= 2 && decoded_bytes != tlv_len) ||
+ (dec_level > 2 && (i < elem_len || decoded_bytes > tlv_len))) {
+ pr_err("%s: Fault in decoding: dl(%d), db(%d), tl(%d), i(%d), el(%d)\n",
+ __func__, dec_level, decoded_bytes, tlv_len,
+ i, elem_len);
+ return -EFAULT;
+ }
+
+ return decoded_bytes;
+}
+
+/**
+ * qmi_decode_string_elem() - Decodes elements of string data type
+ * @ei_array: Struct info array descibing the string element.
+ * @buf_dst: Buffer to store the decoded element.
+ * @buf_src: Buffer containing the elements in QMI wire format.
+ * @tlv_len: Total size of the encoded inforation corresponding to
+ * this string element.
+ * @dec_level: Depth of the string element from the main structure.
+ *
+ * This function decodes the string element of maximum length
+ * "ei_array->elem_len" from the source buffer "buf_src" and puts it into
+ * the destination buffer "buf_dst". This function returns number of bytes
+ * decoded from the input buffer.
+ *
+ * Return: The total size of the decoded data elements on success, negative
+ * errno on error.
+ */
+static int qmi_decode_string_elem(struct qmi_elem_info *ei_array,
+ void *buf_dst, const void *buf_src,
+ u32 tlv_len, int dec_level)
+{
+ int rc;
+ int decoded_bytes = 0;
+ u32 string_len = 0;
+ u32 string_len_sz = 0;
+ struct qmi_elem_info *temp_ei = ei_array;
+
+ if (dec_level == 1) {
+ string_len = tlv_len;
+ } else {
+ string_len_sz = temp_ei->elem_len <= U8_MAX ?
+ sizeof(u8) : sizeof(u16);
+ rc = qmi_decode_basic_elem(&string_len, buf_src,
+ 1, string_len_sz);
+ decoded_bytes += rc;
+ }
+
+ if (string_len > temp_ei->elem_len) {
+ pr_err("%s: String len %d > Max Len %d\n",
+ __func__, string_len, temp_ei->elem_len);
+ return -ETOOSMALL;
+ } else if (string_len > tlv_len) {
+ pr_err("%s: String len %d > Input Buffer Len %d\n",
+ __func__, string_len, tlv_len);
+ return -EFAULT;
+ }
+
+ rc = qmi_decode_basic_elem(buf_dst, buf_src + decoded_bytes,
+ string_len, temp_ei->elem_size);
+ *((char *)buf_dst + string_len) = '\0';
+ decoded_bytes += rc;
+
+ return decoded_bytes;
+}
+
+/**
+ * find_ei() - Find element info corresponding to TLV Type
+ * @ei_array: Struct info array of the message being decoded.
+ * @type: TLV Type of the element being searched.
+ *
+ * Every element that got encoded in the QMI message will have a type
+ * information associated with it. While decoding the QMI message,
+ * this function is used to find the struct info regarding the element
+ * that corresponds to the type being decoded.
+ *
+ * Return: Pointer to struct info, if found
+ */
+static struct qmi_elem_info *find_ei(struct qmi_elem_info *ei_array,
+ u32 type)
+{
+ struct qmi_elem_info *temp_ei = ei_array;
+
+ while (temp_ei->data_type != QMI_EOTI) {
+ if (temp_ei->tlv_type == (u8)type)
+ return temp_ei;
+ temp_ei = temp_ei + 1;
+ }
+
+ return NULL;
+}
+
+/**
+ * qmi_decode() - Core Decode Function
+ * @ei_array: Struct info array describing the structure to be decoded.
+ * @out_c_struct: Buffer to hold the decoded C struct
+ * @in_buf: Buffer containing the QMI message to be decoded
+ * @in_buf_len: Length of the QMI message to be decoded
+ * @dec_level: Decode level to indicate the depth of the nested structure,
+ * within the main structure, being decoded
+ *
+ * Return: The number of bytes of decoded information on success, negative
+ * errno on error.
+ */
+static int qmi_decode(struct qmi_elem_info *ei_array, void *out_c_struct,
+ const void *in_buf, u32 in_buf_len,
+ int dec_level)
+{
+ struct qmi_elem_info *temp_ei = ei_array;
+ u8 opt_flag_value = 1;
+ u32 data_len_value = 0, data_len_sz = 0;
+ u8 *buf_dst = out_c_struct;
+ const u8 *tlv_pointer;
+ u32 tlv_len = 0;
+ u32 tlv_type;
+ u32 decoded_bytes = 0;
+ const void *buf_src = in_buf;
+ int rc;
+
+ while (decoded_bytes < in_buf_len) {
+ if (dec_level >= 2 && temp_ei->data_type == QMI_EOTI)
+ return decoded_bytes;
+
+ if (dec_level == 1) {
+ tlv_pointer = buf_src;
+ QMI_ENCDEC_DECODE_TLV(&tlv_type,
+ &tlv_len, tlv_pointer);
+ buf_src += (TLV_TYPE_SIZE + TLV_LEN_SIZE);
+ decoded_bytes += (TLV_TYPE_SIZE + TLV_LEN_SIZE);
+ temp_ei = find_ei(ei_array, tlv_type);
+ if (!temp_ei && tlv_type < OPTIONAL_TLV_TYPE_START) {
+ pr_err("%s: Inval element info\n", __func__);
+ return -EINVAL;
+ } else if (!temp_ei) {
+ UPDATE_DECODE_VARIABLES(buf_src,
+ decoded_bytes, tlv_len);
+ continue;
+ }
+ } else {
+ /*
+ * No length information for elements in nested
+ * structures. So use remaining decodable buffer space.
+ */
+ tlv_len = in_buf_len - decoded_bytes;
+ }
+
+ buf_dst = out_c_struct + temp_ei->offset;
+ if (temp_ei->data_type == QMI_OPT_FLAG) {
+ memcpy(buf_dst, &opt_flag_value, sizeof(u8));
+ temp_ei = temp_ei + 1;
+ buf_dst = out_c_struct + temp_ei->offset;
+ }
+
+ if (temp_ei->data_type == QMI_DATA_LEN) {
+ data_len_sz = temp_ei->elem_size == sizeof(u8) ?
+ sizeof(u8) : sizeof(u16);
+ rc = qmi_decode_basic_elem(&data_len_value, buf_src,
+ 1, data_len_sz);
+ memcpy(buf_dst, &data_len_value, sizeof(u32));
+ temp_ei = temp_ei + 1;
+ buf_dst = out_c_struct + temp_ei->offset;
+ tlv_len -= data_len_sz;
+ UPDATE_DECODE_VARIABLES(buf_src, decoded_bytes, rc);
+ }
+
+ if (temp_ei->array_type == NO_ARRAY) {
+ data_len_value = 1;
+ } else if (temp_ei->array_type == STATIC_ARRAY) {
+ data_len_value = temp_ei->elem_len;
+ } else if (data_len_value > temp_ei->elem_len) {
+ pr_err("%s: Data len %d > max spec %d\n",
+ __func__, data_len_value, temp_ei->elem_len);
+ return -ETOOSMALL;
+ }
+
+ switch (temp_ei->data_type) {
+ case QMI_UNSIGNED_1_BYTE:
+ case QMI_UNSIGNED_2_BYTE:
+ case QMI_UNSIGNED_4_BYTE:
+ case QMI_UNSIGNED_8_BYTE:
+ case QMI_SIGNED_2_BYTE_ENUM:
+ case QMI_SIGNED_4_BYTE_ENUM:
+ rc = qmi_decode_basic_elem(buf_dst, buf_src,
+ data_len_value,
+ temp_ei->elem_size);
+ UPDATE_DECODE_VARIABLES(buf_src, decoded_bytes, rc);
+ break;
+
+ case QMI_STRUCT:
+ rc = qmi_decode_struct_elem(temp_ei, buf_dst, buf_src,
+ data_len_value, tlv_len,
+ dec_level + 1);
+ if (rc < 0)
+ return rc;
+ UPDATE_DECODE_VARIABLES(buf_src, decoded_bytes, rc);
+ break;
+
+ case QMI_STRING:
+ rc = qmi_decode_string_elem(temp_ei, buf_dst, buf_src,
+ tlv_len, dec_level);
+ if (rc < 0)
+ return rc;
+ UPDATE_DECODE_VARIABLES(buf_src, decoded_bytes, rc);
+ break;
+
+ default:
+ pr_err("%s: Unrecognized data type\n", __func__);
+ return -EINVAL;
+ }
+ temp_ei = temp_ei + 1;
+ }
+
+ return decoded_bytes;
+}
+
+/**
+ * qmi_encode_message() - Encode C structure as QMI encoded message
+ * @type: Type of QMI message
+ * @msg_id: Message ID of the message
+ * @len: Passed as max length of the message, updated to actual size
+ * @txn_id: Transaction ID
+ * @ei: QMI message descriptor
+ * @c_struct: Reference to structure to encode
+ *
+ * Return: Buffer with encoded message, or negative ERR_PTR() on error
+ */
+void *qmi_encode_message(int type, unsigned int msg_id, size_t *len,
+ unsigned int txn_id, struct qmi_elem_info *ei,
+ const void *c_struct)
+{
+ struct qmi_header *hdr;
+ ssize_t msglen = 0;
+ void *msg;
+ int ret;
+
+ /* Check the possibility of a zero length QMI message */
+ if (!c_struct) {
+ ret = qmi_calc_min_msg_len(ei, 1);
+ if (ret) {
+ pr_err("%s: Calc. len %d != 0, but NULL c_struct\n",
+ __func__, ret);
+ return ERR_PTR(-EINVAL);
+ }
+ }
+
+ msg = kzalloc(sizeof(*hdr) + *len, GFP_KERNEL);
+ if (!msg)
+ return ERR_PTR(-ENOMEM);
+
+ /* Encode message, if we have a message */
+ if (c_struct) {
+ msglen = qmi_encode(ei, msg + sizeof(*hdr), c_struct, *len, 1);
+ if (msglen < 0) {
+ kfree(msg);
+ return ERR_PTR(msglen);
+ }
+ }
+
+ hdr = msg;
+ hdr->type = type;
+ hdr->txn_id = txn_id;
+ hdr->msg_id = msg_id;
+ hdr->msg_len = msglen;
+
+ *len = sizeof(*hdr) + msglen;
+
+ return msg;
+}
+EXPORT_SYMBOL(qmi_encode_message);
+
+/**
+ * qmi_decode_message() - Decode QMI encoded message to C structure
+ * @buf: Buffer with encoded message
+ * @len: Amount of data in @buf
+ * @ei: QMI message descriptor
+ * @c_struct: Reference to structure to decode into
+ *
+ * Return: The number of bytes of decoded information on success, negative
+ * errno on error.
+ */
+int qmi_decode_message(const void *buf, size_t len,
+ struct qmi_elem_info *ei, void *c_struct)
+{
+ if (!ei)
+ return -EINVAL;
+
+ if (!c_struct || !buf || !len)
+ return -EINVAL;
+
+ return qmi_decode(ei, c_struct, buf + sizeof(struct qmi_header),
+ len - sizeof(struct qmi_header), 1);
+}
+EXPORT_SYMBOL(qmi_decode_message);
+
+/* Common header in all QMI responses */
+struct qmi_elem_info qmi_response_type_v01_ei[] = {
+ {
+ .data_type = QMI_SIGNED_2_BYTE_ENUM,
+ .elem_len = 1,
+ .elem_size = sizeof(u16),
+ .array_type = NO_ARRAY,
+ .tlv_type = QMI_COMMON_TLV_TYPE,
+ .offset = offsetof(struct qmi_response_type_v01, result),
+ .ei_array = NULL,
+ },
+ {
+ .data_type = QMI_SIGNED_2_BYTE_ENUM,
+ .elem_len = 1,
+ .elem_size = sizeof(u16),
+ .array_type = NO_ARRAY,
+ .tlv_type = QMI_COMMON_TLV_TYPE,
+ .offset = offsetof(struct qmi_response_type_v01, error),
+ .ei_array = NULL,
+ },
+ {
+ .data_type = QMI_EOTI,
+ .elem_len = 0,
+ .elem_size = 0,
+ .array_type = NO_ARRAY,
+ .tlv_type = QMI_COMMON_TLV_TYPE,
+ .offset = 0,
+ .ei_array = NULL,
+ },
+};
+EXPORT_SYMBOL(qmi_response_type_v01_ei);
+
+MODULE_DESCRIPTION("QMI encoder/decoder helper");
+MODULE_LICENSE("GPL v2");
diff --git a/drivers/soc/qcom/qmi_interface.c b/drivers/soc/qcom/qmi_interface.c
new file mode 100644
index 000000000000..877611d5c42b
--- /dev/null
+++ b/drivers/soc/qcom/qmi_interface.c
@@ -0,0 +1,848 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2017 Linaro Ltd.
+ */
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/device.h>
+#include <linux/qrtr.h>
+#include <linux/net.h>
+#include <linux/completion.h>
+#include <linux/idr.h>
+#include <linux/string.h>
+#include <net/sock.h>
+#include <linux/workqueue.h>
+#include <linux/soc/qcom/qmi.h>
+
+static struct socket *qmi_sock_create(struct qmi_handle *qmi,
+ struct sockaddr_qrtr *sq);
+
+/**
+ * qmi_recv_new_server() - handler of NEW_SERVER control message
+ * @qmi: qmi handle
+ * @service: service id of the new server
+ * @instance: instance id of the new server
+ * @node: node of the new server
+ * @port: port of the new server
+ *
+ * Calls the new_server callback to inform the client about a newly registered
+ * server matching the currently registered service lookup.
+ */
+static void qmi_recv_new_server(struct qmi_handle *qmi,
+ unsigned int service, unsigned int instance,
+ unsigned int node, unsigned int port)
+{
+ struct qmi_ops *ops = &qmi->ops;
+ struct qmi_service *svc;
+ int ret;
+
+ if (!ops->new_server)
+ return;
+
+ /* Ignore EOF marker */
+ if (!node && !port)
+ return;
+
+ svc = kzalloc(sizeof(*svc), GFP_KERNEL);
+ if (!svc)
+ return;
+
+ svc->service = service;
+ svc->version = instance & 0xff;
+ svc->instance = instance >> 8;
+ svc->node = node;
+ svc->port = port;
+
+ ret = ops->new_server(qmi, svc);
+ if (ret < 0)
+ kfree(svc);
+ else
+ list_add(&svc->list_node, &qmi->lookup_results);
+}
+
+/**
+ * qmi_recv_del_server() - handler of DEL_SERVER control message
+ * @qmi: qmi handle
+ * @node: node of the dying server, a value of -1 matches all nodes
+ * @port: port of the dying server, a value of -1 matches all ports
+ *
+ * Calls the del_server callback for each previously seen server, allowing the
+ * client to react to the disappearing server.
+ */
+static void qmi_recv_del_server(struct qmi_handle *qmi,
+ unsigned int node, unsigned int port)
+{
+ struct qmi_ops *ops = &qmi->ops;
+ struct qmi_service *svc;
+ struct qmi_service *tmp;
+
+ list_for_each_entry_safe(svc, tmp, &qmi->lookup_results, list_node) {
+ if (node != -1 && svc->node != node)
+ continue;
+ if (port != -1 && svc->port != port)
+ continue;
+
+ if (ops->del_server)
+ ops->del_server(qmi, svc);
+
+ list_del(&svc->list_node);
+ kfree(svc);
+ }
+}
+
+/**
+ * qmi_recv_bye() - handler of BYE control message
+ * @qmi: qmi handle
+ * @node: id of the dying node
+ *
+ * Signals the client that all previously registered services on this node are
+ * now gone and then calls the bye callback to allow the client client further
+ * cleaning up resources associated with this remote.
+ */
+static void qmi_recv_bye(struct qmi_handle *qmi,
+ unsigned int node)
+{
+ struct qmi_ops *ops = &qmi->ops;
+
+ qmi_recv_del_server(qmi, node, -1);
+
+ if (ops->bye)
+ ops->bye(qmi, node);
+}
+
+/**
+ * qmi_recv_del_client() - handler of DEL_CLIENT control message
+ * @qmi: qmi handle
+ * @node: node of the dying client
+ * @port: port of the dying client
+ *
+ * Signals the client about a dying client, by calling the del_client callback.
+ */
+static void qmi_recv_del_client(struct qmi_handle *qmi,
+ unsigned int node, unsigned int port)
+{
+ struct qmi_ops *ops = &qmi->ops;
+
+ if (ops->del_client)
+ ops->del_client(qmi, node, port);
+}
+
+static void qmi_recv_ctrl_pkt(struct qmi_handle *qmi,
+ const void *buf, size_t len)
+{
+ const struct qrtr_ctrl_pkt *pkt = buf;
+
+ if (len < sizeof(struct qrtr_ctrl_pkt)) {
+ pr_debug("ignoring short control packet\n");
+ return;
+ }
+
+ switch (le32_to_cpu(pkt->cmd)) {
+ case QRTR_TYPE_BYE:
+ qmi_recv_bye(qmi, le32_to_cpu(pkt->client.node));
+ break;
+ case QRTR_TYPE_NEW_SERVER:
+ qmi_recv_new_server(qmi,
+ le32_to_cpu(pkt->server.service),
+ le32_to_cpu(pkt->server.instance),
+ le32_to_cpu(pkt->server.node),
+ le32_to_cpu(pkt->server.port));
+ break;
+ case QRTR_TYPE_DEL_SERVER:
+ qmi_recv_del_server(qmi,
+ le32_to_cpu(pkt->server.node),
+ le32_to_cpu(pkt->server.port));
+ break;
+ case QRTR_TYPE_DEL_CLIENT:
+ qmi_recv_del_client(qmi,
+ le32_to_cpu(pkt->client.node),
+ le32_to_cpu(pkt->client.port));
+ break;
+ }
+}
+
+static void qmi_send_new_lookup(struct qmi_handle *qmi, struct qmi_service *svc)
+{
+ struct qrtr_ctrl_pkt pkt;
+ struct sockaddr_qrtr sq;
+ struct msghdr msg = { };
+ struct kvec iv = { &pkt, sizeof(pkt) };
+ int ret;
+
+ memset(&pkt, 0, sizeof(pkt));
+ pkt.cmd = cpu_to_le32(QRTR_TYPE_NEW_LOOKUP);
+ pkt.server.service = cpu_to_le32(svc->service);
+ pkt.server.instance = cpu_to_le32(svc->version | svc->instance << 8);
+
+ sq.sq_family = qmi->sq.sq_family;
+ sq.sq_node = qmi->sq.sq_node;
+ sq.sq_port = QRTR_PORT_CTRL;
+
+ msg.msg_name = &sq;
+ msg.msg_namelen = sizeof(sq);
+
+ mutex_lock(&qmi->sock_lock);
+ if (qmi->sock) {
+ ret = kernel_sendmsg(qmi->sock, &msg, &iv, 1, sizeof(pkt));
+ if (ret < 0)
+ pr_err("failed to send lookup registration: %d\n", ret);
+ }
+ mutex_unlock(&qmi->sock_lock);
+}
+
+/**
+ * qmi_add_lookup() - register a new lookup with the name service
+ * @qmi: qmi handle
+ * @service: service id of the request
+ * @instance: instance id of the request
+ * @version: version number of the request
+ *
+ * Registering a lookup query with the name server will cause the name server
+ * to send NEW_SERVER and DEL_SERVER control messages to this socket as
+ * matching services are registered.
+ *
+ * Return: 0 on success, negative errno on failure.
+ */
+int qmi_add_lookup(struct qmi_handle *qmi, unsigned int service,
+ unsigned int version, unsigned int instance)
+{
+ struct qmi_service *svc;
+
+ svc = kzalloc(sizeof(*svc), GFP_KERNEL);
+ if (!svc)
+ return -ENOMEM;
+
+ svc->service = service;
+ svc->version = version;
+ svc->instance = instance;
+
+ list_add(&svc->list_node, &qmi->lookups);
+
+ qmi_send_new_lookup(qmi, svc);
+
+ return 0;
+}
+EXPORT_SYMBOL(qmi_add_lookup);
+
+static void qmi_send_new_server(struct qmi_handle *qmi, struct qmi_service *svc)
+{
+ struct qrtr_ctrl_pkt pkt;
+ struct sockaddr_qrtr sq;
+ struct msghdr msg = { };
+ struct kvec iv = { &pkt, sizeof(pkt) };
+ int ret;
+
+ memset(&pkt, 0, sizeof(pkt));
+ pkt.cmd = cpu_to_le32(QRTR_TYPE_NEW_SERVER);
+ pkt.server.service = cpu_to_le32(svc->service);
+ pkt.server.instance = cpu_to_le32(svc->version | svc->instance << 8);
+ pkt.server.node = cpu_to_le32(qmi->sq.sq_node);
+ pkt.server.port = cpu_to_le32(qmi->sq.sq_port);
+
+ sq.sq_family = qmi->sq.sq_family;
+ sq.sq_node = qmi->sq.sq_node;
+ sq.sq_port = QRTR_PORT_CTRL;
+
+ msg.msg_name = &sq;
+ msg.msg_namelen = sizeof(sq);
+
+ mutex_lock(&qmi->sock_lock);
+ if (qmi->sock) {
+ ret = kernel_sendmsg(qmi->sock, &msg, &iv, 1, sizeof(pkt));
+ if (ret < 0)
+ pr_err("send service registration failed: %d\n", ret);
+ }
+ mutex_unlock(&qmi->sock_lock);
+}
+
+/**
+ * qmi_add_server() - register a service with the name service
+ * @qmi: qmi handle
+ * @service: type of the service
+ * @instance: instance of the service
+ * @version: version of the service
+ *
+ * Register a new service with the name service. This allows clients to find
+ * and start sending messages to the client associated with @qmi.
+ *
+ * Return: 0 on success, negative errno on failure.
+ */
+int qmi_add_server(struct qmi_handle *qmi, unsigned int service,
+ unsigned int version, unsigned int instance)
+{
+ struct qmi_service *svc;
+
+ svc = kzalloc(sizeof(*svc), GFP_KERNEL);
+ if (!svc)
+ return -ENOMEM;
+
+ svc->service = service;
+ svc->version = version;
+ svc->instance = instance;
+
+ list_add(&svc->list_node, &qmi->services);
+
+ qmi_send_new_server(qmi, svc);
+
+ return 0;
+}
+EXPORT_SYMBOL(qmi_add_server);
+
+/**
+ * qmi_txn_init() - allocate transaction id within the given QMI handle
+ * @qmi: QMI handle
+ * @txn: transaction context
+ * @ei: description of how to decode a matching response (optional)
+ * @c_struct: pointer to the object to decode the response into (optional)
+ *
+ * This allocates a transaction id within the QMI handle. If @ei and @c_struct
+ * are specified any responses to this transaction will be decoded as described
+ * by @ei into @c_struct.
+ *
+ * A client calling qmi_txn_init() must call either qmi_txn_wait() or
+ * qmi_txn_cancel() to free up the allocated resources.
+ *
+ * Return: Transaction id on success, negative errno on failure.
+ */
+int qmi_txn_init(struct qmi_handle *qmi, struct qmi_txn *txn,
+ struct qmi_elem_info *ei, void *c_struct)
+{
+ int ret;
+
+ memset(txn, 0, sizeof(*txn));
+
+ mutex_init(&txn->lock);
+ init_completion(&txn->completion);
+ txn->qmi = qmi;
+ txn->ei = ei;
+ txn->dest = c_struct;
+
+ mutex_lock(&qmi->txn_lock);
+ ret = idr_alloc_cyclic(&qmi->txns, txn, 0, INT_MAX, GFP_KERNEL);
+ if (ret < 0)
+ pr_err("failed to allocate transaction id\n");
+
+ txn->id = ret;
+ mutex_unlock(&qmi->txn_lock);
+
+ return ret;
+}
+EXPORT_SYMBOL(qmi_txn_init);
+
+/**
+ * qmi_txn_wait() - wait for a response on a transaction
+ * @txn: transaction handle
+ * @timeout: timeout, in jiffies
+ *
+ * If the transaction is decoded by the means of @ei and @c_struct the return
+ * value will be the returned value of qmi_decode_message(), otherwise it's up
+ * to the specified message handler to fill out the result.
+ *
+ * Return: the transaction response on success, negative errno on failure.
+ */
+int qmi_txn_wait(struct qmi_txn *txn, unsigned long timeout)
+{
+ struct qmi_handle *qmi = txn->qmi;
+ int ret;
+
+ ret = wait_for_completion_interruptible_timeout(&txn->completion,
+ timeout);
+
+ mutex_lock(&qmi->txn_lock);
+ mutex_lock(&txn->lock);
+ idr_remove(&qmi->txns, txn->id);
+ mutex_unlock(&txn->lock);
+ mutex_unlock(&qmi->txn_lock);
+
+ if (ret < 0)
+ return ret;
+ else if (ret == 0)
+ return -ETIMEDOUT;
+ else
+ return txn->result;
+}
+EXPORT_SYMBOL(qmi_txn_wait);
+
+/**
+ * qmi_txn_cancel() - cancel an ongoing transaction
+ * @txn: transaction id
+ */
+void qmi_txn_cancel(struct qmi_txn *txn)
+{
+ struct qmi_handle *qmi = txn->qmi;
+
+ mutex_lock(&qmi->txn_lock);
+ mutex_lock(&txn->lock);
+ idr_remove(&qmi->txns, txn->id);
+ mutex_unlock(&txn->lock);
+ mutex_unlock(&qmi->txn_lock);
+}
+EXPORT_SYMBOL(qmi_txn_cancel);
+
+/**
+ * qmi_invoke_handler() - find and invoke a handler for a message
+ * @qmi: qmi handle
+ * @sq: sockaddr of the sender
+ * @txn: transaction object for the message
+ * @buf: buffer containing the message
+ * @len: length of @buf
+ *
+ * Find handler and invoke handler for the incoming message.
+ */
+static void qmi_invoke_handler(struct qmi_handle *qmi, struct sockaddr_qrtr *sq,
+ struct qmi_txn *txn, const void *buf, size_t len)
+{
+ const struct qmi_msg_handler *handler;
+ const struct qmi_header *hdr = buf;
+ void *dest;
+ int ret;
+
+ if (!qmi->handlers)
+ return;
+
+ for (handler = qmi->handlers; handler->fn; handler++) {
+ if (handler->type == hdr->type &&
+ handler->msg_id == hdr->msg_id)
+ break;
+ }
+
+ if (!handler->fn)
+ return;
+
+ dest = kzalloc(handler->decoded_size, GFP_KERNEL);
+ if (!dest)
+ return;
+
+ ret = qmi_decode_message(buf, len, handler->ei, dest);
+ if (ret < 0)
+ pr_err("failed to decode incoming message\n");
+ else
+ handler->fn(qmi, sq, txn, dest);
+
+ kfree(dest);
+}
+
+/**
+ * qmi_handle_net_reset() - invoked to handle ENETRESET on a QMI handle
+ * @qmi: the QMI context
+ *
+ * As a result of registering a name service with the QRTR all open sockets are
+ * flagged with ENETRESET and this function will be called. The typical case is
+ * the initial boot, where this signals that the local node id has been
+ * configured and as such any bound sockets needs to be rebound. So close the
+ * socket, inform the client and re-initialize the socket.
+ *
+ * For clients it's generally sufficient to react to the del_server callbacks,
+ * but server code is expected to treat the net_reset callback as a "bye" from
+ * all nodes.
+ *
+ * Finally the QMI handle will send out registration requests for any lookups
+ * and services.
+ */
+static void qmi_handle_net_reset(struct qmi_handle *qmi)
+{
+ struct sockaddr_qrtr sq;
+ struct qmi_service *svc;
+ struct socket *sock;
+
+ sock = qmi_sock_create(qmi, &sq);
+ if (IS_ERR(sock))
+ return;
+
+ mutex_lock(&qmi->sock_lock);
+ sock_release(qmi->sock);
+ qmi->sock = NULL;
+ mutex_unlock(&qmi->sock_lock);
+
+ qmi_recv_del_server(qmi, -1, -1);
+
+ if (qmi->ops.net_reset)
+ qmi->ops.net_reset(qmi);
+
+ mutex_lock(&qmi->sock_lock);
+ qmi->sock = sock;
+ qmi->sq = sq;
+ mutex_unlock(&qmi->sock_lock);
+
+ list_for_each_entry(svc, &qmi->lookups, list_node)
+ qmi_send_new_lookup(qmi, svc);
+
+ list_for_each_entry(svc, &qmi->services, list_node)
+ qmi_send_new_server(qmi, svc);
+}
+
+static void qmi_handle_message(struct qmi_handle *qmi,
+ struct sockaddr_qrtr *sq,
+ const void *buf, size_t len)
+{
+ const struct qmi_header *hdr;
+ struct qmi_txn tmp_txn;
+ struct qmi_txn *txn = NULL;
+ int ret;
+
+ if (len < sizeof(*hdr)) {
+ pr_err("ignoring short QMI packet\n");
+ return;
+ }
+
+ hdr = buf;
+
+ /* If this is a response, find the matching transaction handle */
+ if (hdr->type == QMI_RESPONSE) {
+ mutex_lock(&qmi->txn_lock);
+ txn = idr_find(&qmi->txns, hdr->txn_id);
+
+ /* Ignore unexpected responses */
+ if (!txn) {
+ mutex_unlock(&qmi->txn_lock);
+ return;
+ }
+
+ mutex_lock(&txn->lock);
+ mutex_unlock(&qmi->txn_lock);
+
+ if (txn->dest && txn->ei) {
+ ret = qmi_decode_message(buf, len, txn->ei, txn->dest);
+ if (ret < 0)
+ pr_err("failed to decode incoming message\n");
+
+ txn->result = ret;
+ complete(&txn->completion);
+ } else {
+ qmi_invoke_handler(qmi, sq, txn, buf, len);
+ }
+
+ mutex_unlock(&txn->lock);
+ } else {
+ /* Create a txn based on the txn_id of the incoming message */
+ memset(&tmp_txn, 0, sizeof(tmp_txn));
+ tmp_txn.id = hdr->txn_id;
+
+ qmi_invoke_handler(qmi, sq, &tmp_txn, buf, len);
+ }
+}
+
+static void qmi_data_ready_work(struct work_struct *work)
+{
+ struct qmi_handle *qmi = container_of(work, struct qmi_handle, work);
+ struct qmi_ops *ops = &qmi->ops;
+ struct sockaddr_qrtr sq;
+ struct msghdr msg = { .msg_name = &sq, .msg_namelen = sizeof(sq) };
+ struct kvec iv;
+ ssize_t msglen;
+
+ for (;;) {
+ iv.iov_base = qmi->recv_buf;
+ iv.iov_len = qmi->recv_buf_size;
+
+ mutex_lock(&qmi->sock_lock);
+ if (qmi->sock)
+ msglen = kernel_recvmsg(qmi->sock, &msg, &iv, 1,
+ iv.iov_len, MSG_DONTWAIT);
+ else
+ msglen = -EPIPE;
+ mutex_unlock(&qmi->sock_lock);
+ if (msglen == -EAGAIN)
+ break;
+
+ if (msglen == -ENETRESET) {
+ qmi_handle_net_reset(qmi);
+
+ /* The old qmi->sock is gone, our work is done */
+ break;
+ }
+
+ if (msglen < 0) {
+ pr_err("qmi recvmsg failed: %zd\n", msglen);
+ break;
+ }
+
+ if (sq.sq_node == qmi->sq.sq_node &&
+ sq.sq_port == QRTR_PORT_CTRL) {
+ qmi_recv_ctrl_pkt(qmi, qmi->recv_buf, msglen);
+ } else if (ops->msg_handler) {
+ ops->msg_handler(qmi, &sq, qmi->recv_buf, msglen);
+ } else {
+ qmi_handle_message(qmi, &sq, qmi->recv_buf, msglen);
+ }
+ }
+}
+
+static void qmi_data_ready(struct sock *sk)
+{
+ struct qmi_handle *qmi = sk->sk_user_data;
+
+ /*
+ * This will be NULL if we receive data while being in
+ * qmi_handle_release()
+ */
+ if (!qmi)
+ return;
+
+ queue_work(qmi->wq, &qmi->work);
+}
+
+static struct socket *qmi_sock_create(struct qmi_handle *qmi,
+ struct sockaddr_qrtr *sq)
+{
+ struct socket *sock;
+ int sl = sizeof(*sq);
+ int ret;
+
+ ret = sock_create_kern(&init_net, AF_QIPCRTR, SOCK_DGRAM,
+ PF_QIPCRTR, &sock);
+ if (ret < 0)
+ return ERR_PTR(ret);
+
+ ret = kernel_getsockname(sock, (struct sockaddr *)sq, &sl);
+ if (ret < 0) {
+ sock_release(sock);
+ return ERR_PTR(ret);
+ }
+
+ sock->sk->sk_user_data = qmi;
+ sock->sk->sk_data_ready = qmi_data_ready;
+ sock->sk->sk_error_report = qmi_data_ready;
+
+ return sock;
+}
+
+/**
+ * qmi_handle_init() - initialize a QMI client handle
+ * @qmi: QMI handle to initialize
+ * @recv_buf_size: maximum size of incoming message
+ * @ops: reference to callbacks for QRTR notifications
+ * @handlers: NULL-terminated list of QMI message handlers
+ *
+ * This initializes the QMI client handle to allow sending and receiving QMI
+ * messages. As messages are received the appropriate handler will be invoked.
+ *
+ * Return: 0 on success, negative errno on failure.
+ */
+int qmi_handle_init(struct qmi_handle *qmi, size_t recv_buf_size,
+ const struct qmi_ops *ops,
+ const struct qmi_msg_handler *handlers)
+{
+ int ret;
+
+ mutex_init(&qmi->txn_lock);
+ mutex_init(&qmi->sock_lock);
+
+ idr_init(&qmi->txns);
+
+ INIT_LIST_HEAD(&qmi->lookups);
+ INIT_LIST_HEAD(&qmi->lookup_results);
+ INIT_LIST_HEAD(&qmi->services);
+
+ INIT_WORK(&qmi->work, qmi_data_ready_work);
+
+ qmi->handlers = handlers;
+ if (ops)
+ qmi->ops = *ops;
+
+ if (recv_buf_size < sizeof(struct qrtr_ctrl_pkt))
+ recv_buf_size = sizeof(struct qrtr_ctrl_pkt);
+ else
+ recv_buf_size += sizeof(struct qmi_header);
+
+ qmi->recv_buf_size = recv_buf_size;
+ qmi->recv_buf = kzalloc(recv_buf_size, GFP_KERNEL);
+ if (!qmi->recv_buf)
+ return -ENOMEM;
+
+ qmi->wq = alloc_workqueue("qmi_msg_handler", WQ_UNBOUND, 1);
+ if (!qmi->wq) {
+ ret = -ENOMEM;
+ goto err_free_recv_buf;
+ }
+
+ qmi->sock = qmi_sock_create(qmi, &qmi->sq);
+ if (IS_ERR(qmi->sock)) {
+ pr_err("failed to create QMI socket\n");
+ ret = PTR_ERR(qmi->sock);
+ goto err_destroy_wq;
+ }
+
+ return 0;
+
+err_destroy_wq:
+ destroy_workqueue(qmi->wq);
+err_free_recv_buf:
+ kfree(qmi->recv_buf);
+
+ return ret;
+}
+EXPORT_SYMBOL(qmi_handle_init);
+
+/**
+ * qmi_handle_release() - release the QMI client handle
+ * @qmi: QMI client handle
+ *
+ * This closes the underlying socket and stops any handling of QMI messages.
+ */
+void qmi_handle_release(struct qmi_handle *qmi)
+{
+ struct socket *sock = qmi->sock;
+ struct qmi_service *svc, *tmp;
+
+ sock->sk->sk_user_data = NULL;
+ cancel_work_sync(&qmi->work);
+
+ qmi_recv_del_server(qmi, -1, -1);
+
+ mutex_lock(&qmi->sock_lock);
+ sock_release(sock);
+ qmi->sock = NULL;
+ mutex_unlock(&qmi->sock_lock);
+
+ destroy_workqueue(qmi->wq);
+
+ idr_destroy(&qmi->txns);
+
+ kfree(qmi->recv_buf);
+
+ /* Free registered lookup requests */
+ list_for_each_entry_safe(svc, tmp, &qmi->lookups, list_node) {
+ list_del(&svc->list_node);
+ kfree(svc);
+ }
+
+ /* Free registered service information */
+ list_for_each_entry_safe(svc, tmp, &qmi->services, list_node) {
+ list_del(&svc->list_node);
+ kfree(svc);
+ }
+}
+EXPORT_SYMBOL(qmi_handle_release);
+
+/**
+ * qmi_send_message() - send a QMI message
+ * @qmi: QMI client handle
+ * @sq: destination sockaddr
+ * @txn: transaction object to use for the message
+ * @type: type of message to send
+ * @msg_id: message id
+ * @len: max length of the QMI message
+ * @ei: QMI message description
+ * @c_struct: object to be encoded
+ *
+ * This function encodes @c_struct using @ei into a message of type @type,
+ * with @msg_id and @txn into a buffer of maximum size @len, and sends this to
+ * @sq.
+ *
+ * Return: 0 on success, negative errno on failure.
+ */
+static ssize_t qmi_send_message(struct qmi_handle *qmi,
+ struct sockaddr_qrtr *sq, struct qmi_txn *txn,
+ int type, int msg_id, size_t len,
+ struct qmi_elem_info *ei, const void *c_struct)
+{
+ struct msghdr msghdr = {};
+ struct kvec iv;
+ void *msg;
+ int ret;
+
+ msg = qmi_encode_message(type,
+ msg_id, &len,
+ txn->id, ei,
+ c_struct);
+ if (IS_ERR(msg))
+ return PTR_ERR(msg);
+
+ iv.iov_base = msg;
+ iv.iov_len = len;
+
+ if (sq) {
+ msghdr.msg_name = sq;
+ msghdr.msg_namelen = sizeof(*sq);
+ }
+
+ mutex_lock(&qmi->sock_lock);
+ if (qmi->sock) {
+ ret = kernel_sendmsg(qmi->sock, &msghdr, &iv, 1, len);
+ if (ret < 0)
+ pr_err("failed to send QMI message\n");
+ } else {
+ ret = -EPIPE;
+ }
+ mutex_unlock(&qmi->sock_lock);
+
+ kfree(msg);
+
+ return ret < 0 ? ret : 0;
+}
+
+/**
+ * qmi_send_request() - send a request QMI message
+ * @qmi: QMI client handle
+ * @sq: destination sockaddr
+ * @txn: transaction object to use for the message
+ * @msg_id: message id
+ * @len: max length of the QMI message
+ * @ei: QMI message description
+ * @c_struct: object to be encoded
+ *
+ * Return: 0 on success, negative errno on failure.
+ */
+ssize_t qmi_send_request(struct qmi_handle *qmi, struct sockaddr_qrtr *sq,
+ struct qmi_txn *txn, int msg_id, size_t len,
+ struct qmi_elem_info *ei, const void *c_struct)
+{
+ return qmi_send_message(qmi, sq, txn, QMI_REQUEST, msg_id, len, ei,
+ c_struct);
+}
+EXPORT_SYMBOL(qmi_send_request);
+
+/**
+ * qmi_send_response() - send a response QMI message
+ * @qmi: QMI client handle
+ * @sq: destination sockaddr
+ * @txn: transaction object to use for the message
+ * @msg_id: message id
+ * @len: max length of the QMI message
+ * @ei: QMI message description
+ * @c_struct: object to be encoded
+ *
+ * Return: 0 on success, negative errno on failure.
+ */
+ssize_t qmi_send_response(struct qmi_handle *qmi, struct sockaddr_qrtr *sq,
+ struct qmi_txn *txn, int msg_id, size_t len,
+ struct qmi_elem_info *ei, const void *c_struct)
+{
+ return qmi_send_message(qmi, sq, txn, QMI_RESPONSE, msg_id, len, ei,
+ c_struct);
+}
+EXPORT_SYMBOL(qmi_send_response);
+
+/**
+ * qmi_send_indication() - send an indication QMI message
+ * @qmi: QMI client handle
+ * @sq: destination sockaddr
+ * @msg_id: message id
+ * @len: max length of the QMI message
+ * @ei: QMI message description
+ * @c_struct: object to be encoded
+ *
+ * Return: 0 on success, negative errno on failure.
+ */
+ssize_t qmi_send_indication(struct qmi_handle *qmi, struct sockaddr_qrtr *sq,
+ int msg_id, size_t len, struct qmi_elem_info *ei,
+ const void *c_struct)
+{
+ struct qmi_txn txn;
+ ssize_t rval;
+ int ret;
+
+ ret = qmi_txn_init(qmi, &txn, NULL, NULL);
+ if (ret < 0)
+ return ret;
+
+ rval = qmi_send_message(qmi, sq, &txn, QMI_INDICATION, msg_id, len, ei,
+ c_struct);
+
+ /* We don't care about future messages on this txn */
+ qmi_txn_cancel(&txn);
+
+ return rval;
+}
+EXPORT_SYMBOL(qmi_send_indication);
diff --git a/drivers/soc/qcom/rmtfs_mem.c b/drivers/soc/qcom/rmtfs_mem.c
index ce35ff748adf..0a43b2e8906f 100644
--- a/drivers/soc/qcom/rmtfs_mem.c
+++ b/drivers/soc/qcom/rmtfs_mem.c
@@ -267,3 +267,7 @@ static void qcom_rmtfs_mem_exit(void)
unregister_chrdev_region(qcom_rmtfs_mem_major, QCOM_RMTFS_MEM_DEV_MAX);
}
module_exit(qcom_rmtfs_mem_exit);
+
+MODULE_AUTHOR("Linaro Ltd");
+MODULE_DESCRIPTION("Qualcomm Remote Filesystem memory driver");
+MODULE_LICENSE("GPL v2");
diff --git a/drivers/soc/qcom/smp2p.c b/drivers/soc/qcom/smp2p.c
index f51fb2ea7200..c22503cd1edf 100644
--- a/drivers/soc/qcom/smp2p.c
+++ b/drivers/soc/qcom/smp2p.c
@@ -18,6 +18,7 @@
#include <linux/of.h>
#include <linux/irq.h>
#include <linux/irqdomain.h>
+#include <linux/mailbox_client.h>
#include <linux/mfd/syscon.h>
#include <linux/module.h>
#include <linux/platform_device.h>
@@ -126,6 +127,8 @@ struct smp2p_entry {
* @ipc_regmap: regmap for the outbound ipc
* @ipc_offset: offset within the regmap
* @ipc_bit: bit in regmap@offset to kick to signal remote processor
+ * @mbox_client: mailbox client handle
+ * @mbox_chan: apcs ipc mailbox channel handle
* @inbound: list of inbound entries
* @outbound: list of outbound entries
*/
@@ -146,6 +149,9 @@ struct qcom_smp2p {
int ipc_offset;
int ipc_bit;
+ struct mbox_client mbox_client;
+ struct mbox_chan *mbox_chan;
+
struct list_head inbound;
struct list_head outbound;
};
@@ -154,7 +160,13 @@ static void qcom_smp2p_kick(struct qcom_smp2p *smp2p)
{
/* Make sure any updated data is written before the kick */
wmb();
- regmap_write(smp2p->ipc_regmap, smp2p->ipc_offset, BIT(smp2p->ipc_bit));
+
+ if (smp2p->mbox_chan) {
+ mbox_send_message(smp2p->mbox_chan, NULL);
+ mbox_client_txdone(smp2p->mbox_chan, 0);
+ } else {
+ regmap_write(smp2p->ipc_regmap, smp2p->ipc_offset, BIT(smp2p->ipc_bit));
+ }
}
/**
@@ -453,10 +465,6 @@ static int qcom_smp2p_probe(struct platform_device *pdev)
platform_set_drvdata(pdev, smp2p);
- ret = smp2p_parse_ipc(smp2p);
- if (ret)
- return ret;
-
key = "qcom,smem";
ret = of_property_read_u32_array(pdev->dev.of_node, key,
smp2p->smem_items, 2);
@@ -465,17 +473,13 @@ static int qcom_smp2p_probe(struct platform_device *pdev)
key = "qcom,local-pid";
ret = of_property_read_u32(pdev->dev.of_node, key, &smp2p->local_pid);
- if (ret < 0) {
- dev_err(&pdev->dev, "failed to read %s\n", key);
- return -EINVAL;
- }
+ if (ret)
+ goto report_read_failure;
key = "qcom,remote-pid";
ret = of_property_read_u32(pdev->dev.of_node, key, &smp2p->remote_pid);
- if (ret < 0) {
- dev_err(&pdev->dev, "failed to read %s\n", key);
- return -EINVAL;
- }
+ if (ret)
+ goto report_read_failure;
irq = platform_get_irq(pdev, 0);
if (irq < 0) {
@@ -483,9 +487,23 @@ static int qcom_smp2p_probe(struct platform_device *pdev)
return irq;
}
+ smp2p->mbox_client.dev = &pdev->dev;
+ smp2p->mbox_client.knows_txdone = true;
+ smp2p->mbox_chan = mbox_request_channel(&smp2p->mbox_client, 0);
+ if (IS_ERR(smp2p->mbox_chan)) {
+ if (PTR_ERR(smp2p->mbox_chan) != -ENODEV)
+ return PTR_ERR(smp2p->mbox_chan);
+
+ smp2p->mbox_chan = NULL;
+
+ ret = smp2p_parse_ipc(smp2p);
+ if (ret)
+ return ret;
+ }
+
ret = qcom_smp2p_alloc_outbound_item(smp2p);
if (ret < 0)
- return ret;
+ goto release_mbox;
for_each_available_child_of_node(pdev->dev.of_node, node) {
entry = devm_kzalloc(&pdev->dev, sizeof(*entry), GFP_KERNEL);
@@ -540,7 +558,14 @@ unwind_interfaces:
smp2p->out->valid_entries = 0;
+release_mbox:
+ mbox_free_channel(smp2p->mbox_chan);
+
return ret;
+
+report_read_failure:
+ dev_err(&pdev->dev, "failed to read %s\n", key);
+ return -EINVAL;
}
static int qcom_smp2p_remove(struct platform_device *pdev)
@@ -554,6 +579,8 @@ static int qcom_smp2p_remove(struct platform_device *pdev)
list_for_each_entry(entry, &smp2p->outbound, node)
qcom_smem_state_unregister(entry->state);
+ mbox_free_channel(smp2p->mbox_chan);
+
smp2p->out->valid_entries = 0;
return 0;
diff --git a/drivers/soc/qcom/smsm.c b/drivers/soc/qcom/smsm.c
index 403bea9d546b..50214b620865 100644
--- a/drivers/soc/qcom/smsm.c
+++ b/drivers/soc/qcom/smsm.c
@@ -496,8 +496,10 @@ static int qcom_smsm_probe(struct platform_device *pdev)
if (!smsm->hosts)
return -ENOMEM;
- local_node = of_find_node_with_property(of_node_get(pdev->dev.of_node),
- "#qcom,smem-state-cells");
+ for_each_child_of_node(pdev->dev.of_node, local_node) {
+ if (of_find_property(local_node, "#qcom,smem-state-cells", NULL))
+ break;
+ }
if (!local_node) {
dev_err(&pdev->dev, "no state entry\n");
return -EINVAL;

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