X-Git-Url: https://scm.lunaixsky.com/lunaix-os.git/blobdiff_plain/839da03f6ebe838d780e52190318d4c3048990f1..bc34fd00d2e81fbc890bb2060ed6693454a230bf:/lunaix-os/hal/ahci/ahci.c

diff --git a/lunaix-os/hal/ahci/ahci.c b/lunaix-os/hal/ahci/ahci.c
index c5989fb..a04bca7 100644
--- a/lunaix-os/hal/ahci/ahci.c
+++ b/lunaix-os/hal/ahci/ahci.c
@@ -8,22 +8,71 @@
  * @copyright Copyright (c) 2022
  *
  */
-#include <hal/ahci.h>
+#include <hal/ahci/ahci.h>
+#include <hal/ahci/hba.h>
+#include <hal/ahci/sata.h>
+#include <hal/ahci/scsi.h>
+#include <hal/ahci/utils.h>
+
 #include <hal/pci.h>
 #include <klibc/string.h>
-#include <lunaix/mm/kalloc.h>
+#include <lunaix/block.h>
 #include <lunaix/mm/mmio.h>
 #include <lunaix/mm/pmm.h>
+#include <lunaix/mm/valloc.h>
+#include <lunaix/mm/vmm.h>
 #include <lunaix/spike.h>
 #include <lunaix/syslog.h>
 
 #define HBA_FIS_SIZE 256
 #define HBA_CLB_SIZE 1024
 
+// #define DO_HBA_FULL_RESET
+
 LOG_MODULE("AHCI")
 
 static struct ahci_hba hba;
 
+void
+__ahci_hba_isr(const isr_param* param);
+
+int
+ahci_init_device(struct hba_port* port);
+
+void
+achi_register_ops(struct hba_port* port);
+
+unsigned int
+ahci_get_port_usage()
+{
+    return hba.ports_bmp;
+}
+
+struct hba_port*
+ahci_get_port(unsigned int index)
+{
+    if (index >= 32) {
+        return 0;
+    }
+    return hba.ports[index];
+}
+
+void
+__hba_reset_port(hba_reg_t* port_reg)
+{
+    // 根据：SATA-AHCI spec section 10.4.2 描述的端口重置流程
+    port_reg[HBA_RPxCMD] &= ~HBA_PxCMD_ST;
+    port_reg[HBA_RPxCMD] &= ~HBA_PxCMD_FRE;
+    int cnt = wait_until_expire(!(port_reg[HBA_RPxCMD] & HBA_PxCMD_CR), 500000);
+    if (cnt) {
+        return;
+    }
+    // 如果port未响应，则继续执行重置
+    port_reg[HBA_RPxSCTL] = (port_reg[HBA_RPxSCTL] & ~0xf) | 1;
+    io_delay(100000); //等待至少一毫秒，差不多就行了
+    port_reg[HBA_RPxSCTL] &= ~0xf;
+}
+
 void
 ahci_init()
 {
@@ -41,23 +90,33 @@ ahci_init()
 
     pci_write_cspace(ahci_dev->cspace_base, PCI_REG_STATUS_CMD, cmd);
 
+    pci_setup_msi(ahci_dev, AHCI_HBA_IV);
+    intr_subscribe(AHCI_HBA_IV, __ahci_hba_isr);
+
+    memset(&hba, 0, sizeof(hba));
+
     hba.base = (hba_reg_t*)ioremap(PCI_BAR_ADDR_MM(bar6), size);
 
+#ifdef DO_HBA_FULL_RESET
     // 重置HBA
     hba.base[HBA_RGHC] |= HBA_RGHC_RESET;
     wait_until(!(hba.base[HBA_RGHC] & HBA_RGHC_RESET));
+#endif
 
     // 启用AHCI工作模式，启用中断
-    hba.base[HBA_RGHC] |= (HBA_RGHC_ACHI_ENABLE | HBA_RGHC_INTR_ENABLE);
+    hba.base[HBA_RGHC] |= HBA_RGHC_ACHI_ENABLE;
+    hba.base[HBA_RGHC] |= HBA_RGHC_INTR_ENABLE;
 
     // As per section 3.1.1, this is 0 based value.
     hba_reg_t cap = hba.base[HBA_RCAP];
+    hba_reg_t pmap = hba.base[HBA_RPI];
+
     hba.ports_num = (cap & 0x1f) + 1;  // CAP.PI
     hba.cmd_slots = (cap >> 8) & 0x1f; // CAP.NCS
     hba.version = hba.base[HBA_RVER];
+    hba.ports_bmp = pmap;
 
     /* ------ HBA端口配置 ------ */
-    hba_reg_t pmap = hba.base[HBA_RPI];
     uintptr_t clb_pg_addr, fis_pg_addr, clb_pa, fis_pa;
     for (size_t i = 0, fisp = 0, clbp = 0; i < 32;
          i++, pmap >>= 1, fisp = (fisp + 1) % 16, clbp = (clbp + 1) % 4) {
@@ -65,11 +124,15 @@ ahci_init()
             continue;
         }
 
-        struct ahci_port* port =
-          (struct ahci_port*)lxmalloc(sizeof(struct ahci_port));
+        struct hba_port* port =
+          (struct hba_port*)valloc(sizeof(struct hba_port));
         hba_reg_t* port_regs =
           (hba_reg_t*)(&hba.base[HBA_RPBASE + i * HBA_RPSIZE]);
 
+#ifndef DO_HBA_FULL_RESET
+        __hba_reset_port(port_regs);
+#endif
+
         if (!clbp) {
             // 每页最多4个命令队列
             clb_pa = pmm_alloc_page(KERNEL_PID, PP_FGLOCKED);
@@ -87,18 +150,32 @@ ahci_init()
         port_regs[HBA_RPxCLB] = clb_pa + clbp * HBA_CLB_SIZE;
         port_regs[HBA_RPxFB] = fis_pa + fisp * HBA_FIS_SIZE;
 
-        *port =
-          (struct ahci_port){ .regs = port_regs,
-                              .ssts = port_regs[HBA_RPxSSTS],
-                              .cmdlstv = clb_pg_addr + clbp * HBA_CLB_SIZE,
-                              .fisv = fis_pg_addr + fisp * HBA_FIS_SIZE };
+        *port = (struct hba_port){ .regs = port_regs,
+                                   .ssts = port_regs[HBA_RPxSSTS],
+                                   .cmdlst = clb_pg_addr + clbp * HBA_CLB_SIZE,
+                                   .fis = fis_pg_addr + fisp * HBA_FIS_SIZE };
 
         /* 初始化端口，并置于就绪状态 */
         port_regs[HBA_RPxCI] = 0;
-        port_regs[HBA_RPxIE] |= (HBA_PxINTR_DMA | HBA_PxINTR_D2HR);
-        port_regs[HBA_RPxCMD] |= (HBA_PxCMD_FRE | HBA_PxCMD_ST);
+
+        // 需要通过全部置位去清空这些寄存器（相当的奇怪……）
+        port_regs[HBA_RPxSERR] = -1;
 
         hba.ports[i] = port;
+
+        if (!HBA_RPxSSTS_IF(port->ssts)) {
+            continue;
+        }
+
+        wait_until(!(port_regs[HBA_RPxCMD] & HBA_PxCMD_CR));
+        port_regs[HBA_RPxCMD] |= HBA_PxCMD_FRE;
+        port_regs[HBA_RPxCMD] |= HBA_PxCMD_ST;
+
+        if (!ahci_init_device(port)) {
+            kprintf(KERROR "fail to init device");
+        }
+
+        block_mount_disk(port->device);
     }
 }
 
@@ -107,14 +184,262 @@ char sata_ifs[][20] = { "Not detected",
                         "SATA II (3.0Gbps)",
                         "SATA III (6.0Gbps)" };
 
+void
+__ahci_hba_isr(const isr_param* param)
+{
+    // TODO: clear the interrupt status
+    // TODO: I/O-operation scheduler should be here
+    kprintf(KDEBUG "HBA INTR\n");
+}
+
 void
 ahci_list_device()
 {
-    kprintf(KINFO "Version: %x; Ports: %d\n", hba.version, hba.ports_num);
+    kprintf(KINFO "Version: %x; Ports: %d; Slot: %d\n",
+            hba.version,
+            hba.ports_num,
+            hba.cmd_slots);
+    struct hba_port* port;
     for (size_t i = 0; i < 32; i++) {
-        struct ahci_port* port = hba.ports[i];
-        if (!port)
+        port = hba.ports[i];
+
+        // 愚蠢的gcc似乎认为 struct hba_port* 不可能为空
+        //  所以将这个非常关键的if给优化掉了。
+        //  这里将指针强制转换为整数，欺骗gcc :)
+        if ((uintptr_t)port == 0) {
             continue;
-        kprintf("\t Port %d: %s\n", i, &sata_ifs[HBA_RPxSSTS_IF(port->ssts)]);
+        }
+
+        int device_state = HBA_RPxSSTS_IF(port->ssts);
+
+        kprintf("\t Port %d: %s (%x)\n",
+                i,
+                &sata_ifs[device_state],
+                port->device->flags);
+
+        struct hba_device* dev_info = port->device;
+        if (!device_state || !dev_info) {
+            continue;
+        }
+        kprintf("\t\t capacity: %d KiB\n",
+                (dev_info->max_lba * dev_info->block_size) >> 10);
+        kprintf("\t\t block size: %dB\n", dev_info->block_size);
+        kprintf("\t\t block/sector: %d\n", dev_info->block_per_sec);
+        kprintf("\t\t alignment: %dB\n", dev_info->alignment_offset);
+        kprintf("\t\t capabilities: %x\n", dev_info->capabilities);
+        kprintf("\t\t model: %s\n", &dev_info->model);
+        kprintf("\t\t serial: %s\n", &dev_info->serial_num);
+    }
+}
+
+int
+__get_free_slot(struct hba_port* port)
+{
+    hba_reg_t pxsact = port->regs[HBA_RPxSACT];
+    hba_reg_t pxci = port->regs[HBA_RPxCI];
+    hba_reg_t free_bmp = pxsact | pxci;
+    uint32_t i = 0;
+    for (; i <= hba.cmd_slots && (free_bmp & 0x1); i++, free_bmp >>= 1)
+        ;
+    return i | -(i > hba.cmd_slots);
+}
+
+void
+sata_create_fis(struct sata_reg_fis* cmd_fis,
+                uint8_t command,
+                uint64_t lba,
+                uint16_t sector_count)
+{
+    cmd_fis->head.type = SATA_REG_FIS_H2D;
+    cmd_fis->head.options = SATA_REG_FIS_COMMAND;
+    cmd_fis->head.status_cmd = command;
+    cmd_fis->dev = 0;
+
+    cmd_fis->lba0 = SATA_LBA_COMPONENT(lba, 0);
+    cmd_fis->lba8 = SATA_LBA_COMPONENT(lba, 8);
+    cmd_fis->lba16 = SATA_LBA_COMPONENT(lba, 16);
+    cmd_fis->lba24 = SATA_LBA_COMPONENT(lba, 24);
+
+    cmd_fis->lba32 = SATA_LBA_COMPONENT(lba, 32);
+    cmd_fis->lba40 = SATA_LBA_COMPONENT(lba, 40);
+
+    cmd_fis->count = sector_count;
+}
+
+int
+hba_prepare_cmd(struct hba_port* port,
+                struct hba_cmdt** cmdt,
+                struct hba_cmdh** cmdh,
+                void* buffer,
+                unsigned int size)
+{
+    int slot = __get_free_slot(port);
+    assert_msg(slot >= 0, "HBA: No free slot");
+    assert_msg(size <= 0x400000, "HBA: buffer too big");
+
+    // 构建命令头（Command Header）和命令表（Command Table）
+    struct hba_cmdh* cmd_header = &port->cmdlst[slot];
+    struct hba_cmdt* cmd_table = vzalloc_dma(sizeof(struct hba_cmdt));
+
+    memset(cmd_header, 0, sizeof(*cmd_header));
+
+    // 将命令表挂到命令头上
+    cmd_header->cmd_table_base = vmm_v2p(cmd_table);
+    cmd_header->options =
+      HBA_CMDH_FIS_LEN(sizeof(struct sata_reg_fis)) | HBA_CMDH_CLR_BUSY;
+
+    if (buffer) {
+        cmd_header->prdt_len = 1;
+        cmd_table->entries[0] =
+          (struct hba_prdte){ .data_base = vmm_v2p(buffer),
+                              .byte_count = size - 1 };
+    }
+
+    *cmdh = cmd_header;
+    *cmdt = cmd_table;
+
+    return slot;
+}
+
+int
+ahci_init_device(struct hba_port* port)
+{
+    /* 发送ATA命令，参考：SATA AHCI Spec Rev.1.3.1, section 5.5 */
+    struct hba_cmdt* cmd_table;
+    struct hba_cmdh* cmd_header;
+
+    // mask DHR interrupt
+    port->regs[HBA_RPxIE] &= ~HBA_PxINTR_DHR;
+
+    // 确保端口是空闲的
+    wait_until(!(port->regs[HBA_RPxTFD] & (HBA_PxTFD_BSY)));
+
+    // 预备DMA接收缓存，用于存放HBA传回的数据
+    uint16_t* data_in = (uint16_t*)valloc_dma(512);
+
+    int slot = hba_prepare_cmd(port, &cmd_table, &cmd_header, data_in, 512);
+
+    // 清空任何待响应的中断
+    port->regs[HBA_RPxIS] = 0;
+    port->device = vzalloc(sizeof(struct hba_device));
+    port->device->port = port;
+
+    // 在命令表中构建命令FIS
+    struct sata_reg_fis* cmd_fis = (struct sata_reg_fis*)cmd_table->command_fis;
+
+    // 根据设备类型使用合适的命令
+    if (port->regs[HBA_RPxSIG] == HBA_DEV_SIG_ATA) {
+        // ATA 一般为硬盘
+        sata_create_fis(cmd_fis, ATA_IDENTIFY_DEVICE, 0, 0);
+    } else {
+        // ATAPI 一般为光驱，软驱，或者磁带机
+        port->device->flags |= HBA_DEV_FATAPI;
+        sata_create_fis(cmd_fis, ATA_IDENTIFY_PAKCET_DEVICE, 0, 0);
+    }
+
+    // PxCI寄存器置位，告诉HBA这儿有个数据需要发送到SATA端口
+    port->regs[HBA_RPxCI] = (1 << slot);
+
+    wait_until(!(port->regs[HBA_RPxCI] & (1 << slot)));
+
+    if ((port->regs[HBA_RPxTFD] & HBA_PxTFD_ERR)) {
+        // 有错误
+        sata_read_error(port);
+        goto fail;
+    }
+
+    /*
+        等待数据到达内存
+        解析IDENTIFY DEVICE传回来的数据。
+          参考：
+            * ATA/ATAPI Command Set - 3 (ACS-3), Section 7.12.7
+    */
+    ahci_parse_dev_info(port->device, data_in);
+
+    if (!(port->device->flags & HBA_DEV_FATAPI)) {
+        goto done;
+    }
+
+    /*
+        注意：ATAPI设备是无法通过IDENTIFY PACKET DEVICE 获取容量信息的。
+        我们需要使用SCSI命令的READ_CAPACITY(16)进行获取。
+        步骤如下：
+            1. 因为ATAPI走的是SCSI，而AHCI对此专门进行了SATA的封装，
+               也就是通过SATA的PACKET命令对SCSI命令进行封装。所以我们
+               首先需要构建一个PACKET命令的FIS
+            2. 接着，在ACMD中构建命令READ_CAPACITY的CDB - 一种SCSI命令的封装
+            3. 然后把cmd_header->options的A位置位，表示这是一个送往ATAPI的命令。
+                一点细节：
+                    1. HBA往底层SATA控制器发送PACKET FIS
+                    2. SATA控制器回复PIO Setup FIS
+                    3. HBA读入ACMD中的CDB，打包成Data FIS进行答复
+                    4. SATA控制器解包，拿到CDB，通过SCSI协议转发往ATAPI设备。
+                    5. ATAPI设备回复Return Parameter，SATA通过DMA Setup FIS
+                       发起DMA请求，HBA介入，将Return Parameter写入我们在PRDT
+                       里设置的data_in位置。
+            4. 最后照常等待HBA把结果写入data_in，然后直接解析就好了。
+          参考：
+            * ATA/ATAPI Command Set - 3 (ACS-3), Section 7.18
+            * SATA AHCI HBA Spec, Section 5.3.7
+            * SCSI Command Reference Manual, Section 3.26
+    */
+    struct scsi_cdb16* cdb16 = (struct scsi_cdb16*)cmd_table->atapi_cmd;
+
+    sata_create_fis(cmd_fis, ATA_PACKET, 512 << 8, 0);
+    scsi_create_packet16(cdb16, SCSI_READ_CAPACITY_16, 0, 512);
+
+    cdb16->misc1 = 0x10; // service action
+    cmd_header->transferred_size = 0;
+    cmd_header->options |= HBA_CMDH_ATAPI;
+
+    port->regs[HBA_RPxCI] = (1 << slot);
+    wait_until(!(port->regs[HBA_RPxCI] & (1 << slot)));
+
+    if ((port->regs[HBA_RPxTFD] & HBA_PxTFD_ERR)) {
+        // 有错误
+        sata_read_error(port);
+        goto fail;
+    }
+
+    scsi_parse_capacity(port->device, (uint32_t*)data_in);
+
+done:
+    // reset interrupt status and unmask D2HR interrupt
+    port->regs[HBA_RPxIS] = -1;
+    port->regs[HBA_RPxIE] |= HBA_PxINTR_DHR;
+    achi_register_ops(port);
+
+    vfree_dma(data_in);
+    vfree_dma(cmd_table);
+
+    return 1;
+
+fail:
+    port->regs[HBA_RPxIS] = -1;
+    port->regs[HBA_RPxIE] |= HBA_PxINTR_DHR;
+    vfree_dma(data_in);
+    vfree_dma(cmd_table);
+
+    return 0;
+}
+
+int
+ahci_identify_device(struct hba_device* device)
+{
+    // 用于重新识别设备（比如在热插拔的情况下）
+    vfree(device);
+    return ahci_init_device(device->port);
+}
+
+void
+achi_register_ops(struct hba_port* port)
+{
+    port->device->ops.identify = ahci_identify_device;
+    if (!(port->device->flags & HBA_DEV_FATAPI)) {
+        port->device->ops.read_buffer = sata_read_buffer;
+        port->device->ops.write_buffer = sata_write_buffer;
+    } else {
+        port->device->ops.read_buffer = scsi_read_buffer;
+        port->device->ops.write_buffer = scsi_write_buffer;
     }
 }
\ No newline at end of file