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virt_ivshmem.c
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virt_ivshmem.c
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/*
* Copyright (c) 2020 Intel Corporation.
*
* SPDX-License-Identifier: Apache-2.0
*/
#define DT_DRV_COMPAT qemu_ivshmem
#define LOG_LEVEL CONFIG_IVSHMEM_LOG_LEVEL
#include <zephyr/logging/log.h>
LOG_MODULE_REGISTER(ivshmem);
#include <errno.h>
#include <zephyr/kernel.h>
#include <zephyr/arch/cpu.h>
#include <zephyr/device.h>
#include <zephyr/init.h>
#include <zephyr/drivers/virtualization/ivshmem.h>
#include "virt_ivshmem.h"
#ifdef CONFIG_IVSHMEM_DOORBELL
static void ivshmem_doorbell(const void *arg)
{
const struct ivshmem_param *param = arg;
LOG_DBG("Interrupt received on vector %u", param->vector);
if (param->signal != NULL) {
k_poll_signal_raise(param->signal, param->vector);
}
}
static bool ivshmem_configure_interrupts(const struct device *dev)
{
struct ivshmem *data = dev->data;
bool ret = false;
uint8_t n_vectors;
uint32_t key;
int i;
key = irq_lock();
n_vectors = pcie_msi_vectors_allocate(data->pcie->bdf,
CONFIG_IVSHMEM_INT_PRIORITY,
data->vectors,
CONFIG_IVSHMEM_MSI_X_VECTORS);
if (n_vectors == 0) {
LOG_ERR("Could not allocate %u MSI-X vectors",
CONFIG_IVSHMEM_MSI_X_VECTORS);
goto out;
}
LOG_DBG("Allocated %u vectors", n_vectors);
for (i = 0; i < n_vectors; i++) {
data->params[i].dev = dev;
data->params[i].vector = i;
if (!pcie_msi_vector_connect(data->pcie->bdf,
&data->vectors[i],
ivshmem_doorbell,
&data->params[i], 0)) {
LOG_ERR("Failed to connect MSI-X vector %u", i);
goto out;
}
}
LOG_DBG("%u MSI-X Vectors connected", n_vectors);
if (!pcie_msi_enable(data->pcie->bdf, data->vectors, n_vectors, 0)) {
LOG_ERR("Could not enable MSI-X");
goto out;
}
data->n_vectors = n_vectors;
ret = true;
LOG_DBG("MSI-X configured");
out:
irq_unlock(key);
return ret;
}
static void register_signal(const struct device *dev,
struct k_poll_signal *signal,
uint16_t vector)
{
struct ivshmem *data = dev->data;
data->params[vector].signal = signal;
}
#else
static const struct ivshmem_reg no_reg;
#define ivshmem_configure_interrupts(...) true
#define register_signal(...)
#endif /* CONFIG_IVSHMEM_DOORBELL */
static bool ivshmem_configure(const struct device *dev)
{
struct ivshmem *data = dev->data;
struct pcie_bar mbar_regs, mbar_mem;
if (!pcie_get_mbar(data->pcie->bdf, IVSHMEM_PCIE_REG_BAR_IDX, &mbar_regs)) {
#ifdef CONFIG_IVSHMEM_DOORBELL
LOG_ERR("ivshmem regs bar not found");
return false;
#else
LOG_DBG("ivshmem regs bar not found");
device_map(DEVICE_MMIO_RAM_PTR(dev), (uintptr_t)&no_reg,
sizeof(struct ivshmem_reg), K_MEM_CACHE_NONE);
#endif /* CONFIG_IVSHMEM_DOORBELL */
} else {
pcie_set_cmd(data->pcie->bdf, PCIE_CONF_CMDSTAT_MEM, true);
device_map(DEVICE_MMIO_RAM_PTR(dev), mbar_regs.phys_addr,
mbar_regs.size, K_MEM_CACHE_NONE);
}
if (!pcie_get_mbar(data->pcie->bdf, IVSHMEM_PCIE_SHMEM_BAR_IDX, &mbar_mem)) {
LOG_ERR("ivshmem mem bar not found");
return false;
}
data->size = mbar_mem.size;
z_phys_map((uint8_t **)&data->shmem,
mbar_mem.phys_addr, data->size,
K_MEM_CACHE_WB | K_MEM_PERM_RW | K_MEM_PERM_USER);
LOG_DBG("ivshmem configured:");
LOG_DBG("- Registers at 0x%lx (mapped to 0x%lx)",
mbar_regs.phys_addr, DEVICE_MMIO_GET(dev));
LOG_DBG("- Shared memory of %lu bytes at 0x%lx (mapped to 0x%lx)",
data->size, mbar_mem.phys_addr, data->shmem);
return ivshmem_configure_interrupts(dev);
}
static size_t ivshmem_api_get_mem(const struct device *dev,
uintptr_t *memmap)
{
struct ivshmem *data = dev->data;
*memmap = data->shmem;
return data->size;
}
static uint32_t ivshmem_api_get_id(const struct device *dev)
{
struct ivshmem_reg *regs = (struct ivshmem_reg *)DEVICE_MMIO_GET(dev);
return regs->iv_position;
}
static uint16_t ivshmem_api_get_vectors(const struct device *dev)
{
#if CONFIG_IVSHMEM_DOORBELL
struct ivshmem *data = dev->data;
return data->n_vectors;
#else
return 0;
#endif
}
static int ivshmem_api_int_peer(const struct device *dev,
uint32_t peer_id, uint16_t vector)
{
#if CONFIG_IVSHMEM_DOORBELL
struct ivshmem_reg *regs = (struct ivshmem_reg *)DEVICE_MMIO_GET(dev);
struct ivshmem *data = dev->data;
uint32_t doorbell;
if (vector >= data->n_vectors) {
return -EINVAL;
}
doorbell = IVSHMEM_GEN_DOORBELL(peer_id, vector);
regs->doorbell = doorbell;
return 0;
#else
return -ENOSYS;
#endif
}
static int ivshmem_api_register_handler(const struct device *dev,
struct k_poll_signal *signal,
uint16_t vector)
{
#if CONFIG_IVSHMEM_DOORBELL
struct ivshmem *data = dev->data;
if (vector >= data->n_vectors) {
return -EINVAL;
}
register_signal(dev, signal, vector);
return 0;
#else
return -ENOSYS;
#endif
}
static const struct ivshmem_driver_api ivshmem_api = {
.get_mem = ivshmem_api_get_mem,
.get_id = ivshmem_api_get_id,
.get_vectors = ivshmem_api_get_vectors,
.int_peer = ivshmem_api_int_peer,
.register_handler = ivshmem_api_register_handler
};
static int ivshmem_init(const struct device *dev)
{
struct ivshmem *data = dev->data;
if (data->pcie->bdf == PCIE_BDF_NONE) {
LOG_WRN("ivshmem device not found");
return -ENOTSUP;
}
LOG_DBG("ivshmem found at bdf 0x%x", data->pcie->bdf);
if (!ivshmem_configure(dev)) {
return -EIO;
}
return 0;
}
#define IVSHMEM_DEVICE_INIT(n) \
DEVICE_PCIE_INST_DECLARE(n); \
static struct ivshmem ivshmem_data_##n = { \
DEVICE_PCIE_INST_INIT(n, pcie), \
}; \
DEVICE_DT_INST_DEFINE(n, &ivshmem_init, NULL, \
&ivshmem_data_##n, NULL, \
POST_KERNEL, CONFIG_KERNEL_INIT_PRIORITY_DEVICE, \
&ivshmem_api);
DT_INST_FOREACH_STATUS_OKAY(IVSHMEM_DEVICE_INIT)