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Code Issues Releases Wiki Activity

new: msix中断

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This commit is contained in:
fslongjin 2022-08-23 21:10:48 +08:00
parent 554b73ec99
commit ff94280f77
6 changed files with 176 additions and 10 deletions
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125
kernel/driver/pci/msi.c
View File

@ -1,6 +1,7 @@
#include "msi.h"
#include "pci.h"
#include <common/errno.h>
#include <mm/mmio.h>
/**
* @brief 生成msi消息
@ -10,6 +11,112 @@
*/
extern struct msi_msg_t *msi_arch_get_msg(struct msi_desc_t *msi_desc);
/**
* @brief 读取msix的capability list
*
* @param msi_desc msi描述符
* @param cap_off capability list的offset
* @return struct pci_msix_cap_t 对应的capability list
*/
static __always_inline struct pci_msix_cap_t __msi_read_msix_cap_list(struct msi_desc_t *msi_desc, uint32_t cap_off)
{
struct pci_msix_cap_t cap_list = {0};
uint32_t dw0;
dw0 = pci_read_config(msi_desc->pci_dev->bus, msi_desc->pci_dev->device, msi_desc->pci_dev->func, cap_off);
cap_list.cap_id = dw0 & 0xff;
cap_list.next_off = (dw0 >> 8) & 0xff;
cap_list.msg_ctrl = (dw0 >> 16) & 0xffff;
cap_list.dword1 = pci_read_config(msi_desc->pci_dev->bus, msi_desc->pci_dev->device, msi_desc->pci_dev->func, cap_off + 0x4);
cap_list.dword2 = pci_read_config(msi_desc->pci_dev->bus, msi_desc->pci_dev->device, msi_desc->pci_dev->func, cap_off + 0x8);
return cap_list;
}
static __always_inline struct pci_msi_cap_t __msi_read_cap_list(struct msi_desc_t *msi_desc, uint32_t cap_off)
{
struct pci_msi_cap_t cap_list;
uint32_t dw0;
dw0 = pci_read_config(msi_desc->pci_dev->bus, msi_desc->pci_dev->device, msi_desc->pci_dev->func, cap_off);
cap_list.cap_id = dw0 & 0xff;
cap_list.next_off = (dw0 >> 8) & 0xff;
cap_list.msg_ctrl = (dw0 >> 16) & 0xffff;
cap_list.msg_addr_lo = pci_read_config(msi_desc->pci_dev->bus, msi_desc->pci_dev->device, msi_desc->pci_dev->func, cap_off + 0x4);
uint16_t msg_data_off = 0xc;
if (cap_list.msg_ctrl & (1 << 7)) // 64位
{
cap_list.msg_addr_hi = pci_read_config(msi_desc->pci_dev->bus, msi_desc->pci_dev->device, msi_desc->pci_dev->func, cap_off + 0x8);
}
else
{
cap_list.msg_addr_hi = 0;
msg_data_off = 0x8;
}
cap_list.msg_data = pci_read_config(msi_desc->pci_dev->bus, msi_desc->pci_dev->device, msi_desc->pci_dev->func, cap_off + msg_data_off) & 0xffff;
cap_list.mask = pci_read_config(msi_desc->pci_dev->bus, msi_desc->pci_dev->device, msi_desc->pci_dev->func, cap_off + 0x10);
cap_list.pending = pci_read_config(msi_desc->pci_dev->bus, msi_desc->pci_dev->device, msi_desc->pci_dev->func, cap_off + 0x14);
return cap_list;
}
/**
* @brief 映射设备的msix表
*
* @param pci_dev pci设备信息结构体
* @param msix_cap msix capability list的结构体
* @return int 错误码
*/
static __always_inline int __msix_map_table(struct pci_device_structure_header_t *pci_dev, struct pci_msix_cap_t *msix_cap)
{
// 计算bar寄存器的offset
uint32_t bar_off = 0x10 + 4 * (msix_cap->dword1 & 0x7);
// msix table相对于bar寄存器中存储的地址的offset
pci_dev->msix_offset = msix_cap->dword1 & (~0x7);
pci_dev->msix_table_size = (msix_cap->msg_ctrl & 0x7ff) + 1;
pci_dev->msix_mmio_size = pci_dev->msix_table_size * 16 + pci_dev->msix_offset;
// 申请mmio空间
mmio_create(pci_dev->msix_mmio_size, VM_IO | VM_DONTCOPY, &pci_dev->msix_mmio_vaddr, &pci_dev->msix_mmio_size);
pci_dev->msix_mmio_vaddr &= (~0xf);
uint32_t bar = pci_read_config(pci_dev->bus, pci_dev->device, pci_dev->func, bar_off);
kdebug("pci_dev->msix_mmio_vaddr=%#018lx, bar=%#010lx, table offset=%#010lx, table_size=%#010lx, mmio_size=%d", pci_dev->msix_mmio_vaddr, bar, pci_dev->msix_offset, pci_dev->msix_table_size, pci_dev->msix_mmio_size);
// 将msix table映射到页表
mm_map(&initial_mm, pci_dev->msix_mmio_vaddr, pci_dev->msix_mmio_size, bar);
return 0;
}
/**
* @brief 将msi_desc中的数据填写到msix表的指定表项处
*
* @param pci_dev pci设备结构体
* @param msi_desc msi描述符
*/
static __always_inline void __msix_set_entry(struct msi_desc_t *msi_desc)
{
uint64_t *ptr = (uint64_t *)(msi_desc->pci_dev->msix_mmio_vaddr + msi_desc->pci_dev->msix_offset + msi_desc->msi_index * 16);
*ptr = (msi_desc->msg.address_hi << 32) | (msi_desc->msg.address_lo);
++ptr;
*ptr = (msi_desc->msg.vector_control << 32) | (msi_desc->msg.data);
}
/**
* @brief 清空设备的msix table的指定表项
*
* @param pci_dev pci设备
* @param msi_index 表项号
*/
static __always_inline void __msix_clear_entry(struct pci_device_structure_header_t *pci_dev, uint16_t msi_index)
{
uint64_t *ptr = (uint64_t *)(pci_dev->msix_mmio_vaddr + pci_dev->msix_offset + msi_index * 16);
*ptr = 0;
++ptr;
*ptr = 0;
}
/**
* @brief 启用 Message Signaled Interrupts
*
@ -51,8 +158,20 @@ int pci_enable_msi(struct msi_desc_t *msi_desc)
// 获取msi消息
msi_arch_get_msg(msi_desc);
if (msi_desc->pci.msi_attribute.is_msix)
if (msi_desc->pci.msi_attribute.is_msix) // MSI-X
{
// 读取msix的信息
struct pci_msix_cap_t cap = __msi_read_msix_cap_list(msi_desc, cap_ptr);
// 映射msix table
__msix_map_table(msi_desc->pci_dev, &cap);
// 设置msix的中断
__msix_set_entry(msi_desc);
// 使能msi
tmp = pci_read_config(ptr->bus, ptr->device, ptr->func, cap_ptr); // 读取cap+0x0处的值
tmp |= (1 << 16);
pci_write_config(ptr->bus, ptr->device, ptr->func, cap_ptr, tmp);
}
else
{
@ -124,7 +243,7 @@ int pci_start_msi(void *header)
if (tmp & 0xff != 0x5)
return -ENOSYS;
//使能msi
// 使能msi
tmp = pci_read_config(ptr->bus, ptr->device, ptr->func, cap_ptr); // 读取cap+0x0处的值
tmp |= (1 << 16);
pci_write_config(ptr->bus, ptr->device, ptr->func, cap_ptr, tmp);
@ -182,7 +301,7 @@ int pci_disable_msi(void *header)
if (tmp & 0xff != 0x5)
return -ENOSYS;
//禁用msi
// 禁用msi
tmp = pci_read_config(ptr->bus, ptr->device, ptr->func, cap_ptr); // 读取cap+0x0处的值
tmp &= (~(1 << 16));
pci_write_config(ptr->bus, ptr->device, ptr->func, cap_ptr, tmp);

41
kernel/driver/pci/msi.h
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@ -10,6 +10,7 @@ struct msi_msg_t
uint32_t address_lo;
uint32_t address_hi;
uint32_t data;
uint32_t vector_control;
};
struct pci_msi_desc_t
{
@ -27,6 +28,42 @@ struct pci_msi_desc_t
} msi_attribute;
};
/**
* @brief msi capability list的结构
*
*/
struct pci_msi_cap_t
{
uint8_t cap_id;
uint8_t next_off;
uint16_t msg_ctrl;
uint32_t msg_addr_lo;
uint32_t msg_addr_hi;
uint16_t msg_data;
uint16_t Rsvd;
uint32_t mask;
uint32_t pending;
};
/**
* @brief MSI-X的capability list结构体
*
*/
struct pci_msix_cap_t
{
uint8_t cap_id;
uint8_t next_off;
uint16_t msg_ctrl;
uint32_t dword1; // 该DWORD的组成为：[Table Offset][BIR2:0].
// 由于Table Offset是8字节对齐的，因此mask掉该dword的BIR部分，就是table offset的值
uint32_t dword2; // 该DWORD的组成为：[Pending Bit Offset][Pending Bit BIR2:0].
// 由于Pending Bit Offset是8字节对齐的，因此mask掉该dword的BIR部分，就是Pending Bit Offset的值
};
/**
* @brief msi描述符
*
@ -40,7 +77,7 @@ struct msi_desc_t
struct pci_device_structure_header_t *pci_dev; // 对应的pci设备的结构体
struct msi_msg_t msg; // msi消息
uint16_t msi_index; // msi描述符的index
struct pci_msi_desc_t pci; // 与pci相关的msi描述符数据
struct pci_msi_desc_t pci; // 与pci相关的msi描述符数据
};
/**
@ -54,7 +91,7 @@ struct msi_desc_t
*
* @return 返回码
*/
int pci_enable_msi(struct msi_desc_t * msi_desc);
int pci_enable_msi(struct msi_desc_t *msi_desc);
/**
* @brief 禁用指定设备的msi

5
kernel/driver/pci/pci.c
View File

@ -503,7 +503,7 @@ void pci_get_device_structure(uint8_t class_code, uint8_t sub_class, struct pci_
* @param cap_type c要寻找的capability类型
* @return uint64_t cap list的偏移量
*/
uint32_t pci_enumerate_capability_list(struct pci_device_structure_header_t *pci_dev, int cap_type)
int32_t pci_enumerate_capability_list(struct pci_device_structure_header_t *pci_dev, uint32_t cap_type)
{
uint32_t cap_offset;
switch (pci_dev->HeaderType)
@ -524,7 +524,8 @@ uint32_t pci_enumerate_capability_list(struct pci_device_structure_header_t *pci
while (1)
{
tmp = pci_read_config(pci_dev->bus, pci_dev->device, pci_dev->func, cap_offset);
if (tmp & 0xff != cap_type)
kdebug("tmp & 0xff=%#010lx",tmp & 0xff);
if ((tmp & 0xff) != cap_type)
{
if ((tmp & 0xff00) >> 8)
{

11
kernel/driver/pci/pci.h
View File

@ -19,6 +19,13 @@ void pci_init();
struct pci_device_structure_header_t
{
struct List list;
// 包含msix table地址的bar的mmio基地址
uint64_t msix_mmio_vaddr;
uint64_t msix_mmio_size; // msix映射长度
uint32_t msix_offset; // msix表的offset
uint16_t msix_table_size; // msix表的表项数量
// ==== 以下三个变量表示该结构体所处的位置
uint8_t bus;
uint8_t device;
@ -43,7 +50,7 @@ struct pci_device_structure_header_t
// | bit7 | bit6 | Bits 5-4 | Bits 3-0 |
// | BIST Capable | Start BIST | Reserved | Completion Code |
// for more details, please visit https://wiki.osdev.org/PCI
} __attribute__((packed));
};
/**
* @brief 表头类型为0x0的pci设备结构
@ -215,4 +222,4 @@ void pci_get_device_structure(uint8_t class_code, uint8_t sub_class, struct pci_
* @param cap_type c要寻找的capability类型
* @return uint64_t cap list的偏移量
*/
uint32_t pci_enumerate_capability_list(struct pci_device_structure_header_t *pci_dev, int cap_type);
int32_t pci_enumerate_capability_list(struct pci_device_structure_header_t *pci_dev, uint32_t cap_type);

1
kernel/driver/usb/xhci/xhci.c
View File

@ -593,6 +593,7 @@ uint64_t xhci_hc_irq_install(uint64_t irq_num, void *arg)
msi_desc.edge_trigger = info->edge_trigger;
msi_desc.processor = info->processor;
msi_desc.pci.msi_attribute.is_64 = 1;
msi_desc.pci.msi_attribute.is_msix=1;
// todo: QEMU是使用msix的，因此要先在pci中实现msix
io_mfence();
int retval = pci_enable_msi(&msi_desc);

3
kernel/mm/mm.c
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@ -249,7 +249,8 @@ unsigned long page_init(struct Page *page, ul flags)
{
++page->ref_counts;
barrier();
++page->zone->total_pages_link;
if (page->zone)
++page->zone->total_pages_link;
}
page->anon_vma = NULL;
spin_init(&(page->op_lock));