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scsi_disk.cpp
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scsi_disk.cpp
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/*
* Copyright 2021 David Sebek, dasebek@gmail.com
* Copyright 2008-2013 Axel Dörfler, axeld@pinc-software.de
* Copyright 2002/03 Thomas Kurschel
* All rights reserved. Distributed under the terms of the MIT License.
*/
/*! Peripheral driver to handle any kind of SCSI disks,
i.e. hard disk and floopy disks (ZIP etc.)
Much work is done by scsi_periph and block_io.
You'll find das_... all over the place. This stands for
"Direct Access Storage" which is the official SCSI name for
normal (floppy/hard/ZIP)-disk drives.
*/
#include "scsi_disk.h"
#include <string.h>
#include <stdlib.h>
#include <AutoDeleter.h>
#include <fs/devfs.h>
#include <util/fs_trim_support.h>
#include "dma_resources.h"
#include "IORequest.h"
#include "IOSchedulerSimple.h"
//#define TRACE_SCSI_DISK
#ifdef TRACE_SCSI_DISK
# define TRACE(x...) dprintf("scsi_disk: " x)
#else
# define TRACE(x...) ;
#endif
static const uint8 kDriveIcon[] = {
0x6e, 0x63, 0x69, 0x66, 0x08, 0x03, 0x01, 0x00, 0x00, 0x02, 0x00, 0x16,
0x02, 0x3c, 0xc7, 0xee, 0x38, 0x9b, 0xc0, 0xba, 0x16, 0x57, 0x3e, 0x39,
0xb0, 0x49, 0x77, 0xc8, 0x42, 0xad, 0xc7, 0x00, 0xff, 0xff, 0xd3, 0x02,
0x00, 0x06, 0x02, 0x3c, 0x96, 0x32, 0x3a, 0x4d, 0x3f, 0xba, 0xfc, 0x01,
0x3d, 0x5a, 0x97, 0x4b, 0x57, 0xa5, 0x49, 0x84, 0x4d, 0x00, 0x47, 0x47,
0x47, 0xff, 0xa5, 0xa0, 0xa0, 0x02, 0x00, 0x16, 0x02, 0xbc, 0x59, 0x2f,
0xbb, 0x29, 0xa7, 0x3c, 0x0c, 0xe4, 0xbd, 0x0b, 0x7c, 0x48, 0x92, 0xc0,
0x4b, 0x79, 0x66, 0x00, 0x7d, 0xff, 0xd4, 0x02, 0x00, 0x06, 0x02, 0x38,
0xdb, 0xb4, 0x39, 0x97, 0x33, 0xbc, 0x4a, 0x33, 0x3b, 0xa5, 0x42, 0x48,
0x6e, 0x66, 0x49, 0xee, 0x7b, 0x00, 0x59, 0x67, 0x56, 0xff, 0xeb, 0xb2,
0xb2, 0x03, 0xa7, 0xff, 0x00, 0x03, 0xff, 0x00, 0x00, 0x04, 0x01, 0x80,
0x07, 0x0a, 0x06, 0x22, 0x3c, 0x22, 0x49, 0x44, 0x5b, 0x5a, 0x3e, 0x5a,
0x31, 0x39, 0x25, 0x0a, 0x04, 0x22, 0x3c, 0x44, 0x4b, 0x5a, 0x31, 0x39,
0x25, 0x0a, 0x04, 0x44, 0x4b, 0x44, 0x5b, 0x5a, 0x3e, 0x5a, 0x31, 0x0a,
0x04, 0x22, 0x3c, 0x22, 0x49, 0x44, 0x5b, 0x44, 0x4b, 0x08, 0x02, 0x27,
0x43, 0xb8, 0x14, 0xc1, 0xf1, 0x08, 0x02, 0x26, 0x43, 0x29, 0x44, 0x0a,
0x05, 0x44, 0x5d, 0x49, 0x5d, 0x60, 0x3e, 0x5a, 0x3b, 0x5b, 0x3f, 0x08,
0x0a, 0x07, 0x01, 0x06, 0x00, 0x0a, 0x00, 0x01, 0x00, 0x10, 0x01, 0x17,
0x84, 0x00, 0x04, 0x0a, 0x01, 0x01, 0x01, 0x00, 0x0a, 0x02, 0x01, 0x02,
0x00, 0x0a, 0x03, 0x01, 0x03, 0x00, 0x0a, 0x04, 0x01, 0x04, 0x10, 0x01,
0x17, 0x85, 0x20, 0x04, 0x0a, 0x06, 0x01, 0x05, 0x30, 0x24, 0xb3, 0x99,
0x01, 0x17, 0x82, 0x00, 0x04, 0x0a, 0x05, 0x01, 0x05, 0x30, 0x20, 0xb2,
0xe6, 0x01, 0x17, 0x82, 0x00, 0x04
};
static scsi_periph_interface* sSCSIPeripheral;
static device_manager_info* sDeviceManager;
static status_t
update_capacity(das_driver_info* device)
{
TRACE("update_capacity()\n");
scsi_ccb *ccb = device->scsi->alloc_ccb(device->scsi_device);
if (ccb == NULL)
return B_NO_MEMORY;
status_t status = sSCSIPeripheral->check_capacity(
device->scsi_periph_device, ccb);
device->scsi->free_ccb(ccb);
return status;
}
static status_t
get_geometry(das_handle* handle, device_geometry* geometry)
{
das_driver_info* info = handle->info;
status_t status = update_capacity(info);
if (status != B_OK)
return status;
devfs_compute_geometry_size(geometry, info->capacity, info->block_size);
geometry->bytes_per_physical_sector = info->physical_block_size;
geometry->device_type = B_DISK;
geometry->removable = info->removable;
// TBD: for all but CD-ROMs, read mode sense - medium type
// (bit 7 of block device specific parameter for Optical Memory Block Device)
// (same for Direct-Access Block Devices)
// (same for write-once block devices)
// (same for optical memory block devices)
geometry->read_only = false;
geometry->write_once = false;
TRACE("scsi_disk: get_geometry(): %" B_PRId32 ", %" B_PRId32 ", %" B_PRId32
", %" B_PRId32 ", %d, %d, %d, %d, %" B_PRId32 "\n", geometry->bytes_per_sector,
geometry->sectors_per_track, geometry->cylinder_count,
geometry->head_count, geometry->device_type,
geometry->removable, geometry->read_only, geometry->write_once,
geometry->bytes_per_physical_sector);
return B_OK;
}
static status_t
load_eject(das_driver_info *device, bool load)
{
TRACE("load_eject()\n");
scsi_ccb *ccb = device->scsi->alloc_ccb(device->scsi_device);
if (ccb == NULL)
return B_NO_MEMORY;
err_res result = sSCSIPeripheral->send_start_stop(
device->scsi_periph_device, ccb, load, true);
device->scsi->free_ccb(ccb);
return result.error_code;
}
static status_t
synchronize_cache(das_driver_info *device)
{
TRACE("synchronize_cache()\n");
scsi_ccb *ccb = device->scsi->alloc_ccb(device->scsi_device);
if (ccb == NULL)
return B_NO_MEMORY;
err_res result = sSCSIPeripheral->synchronize_cache(
device->scsi_periph_device, ccb);
device->scsi->free_ccb(ccb);
return result.error_code;
}
static status_t
trim_device(das_driver_info* device, fs_trim_data* trimData)
{
TRACE("trim_device()\n");
trimData->trimmed_size = 0;
scsi_ccb* request = device->scsi->alloc_ccb(device->scsi_device);
if (request == NULL)
return B_NO_MEMORY;
scsi_block_range* blockRanges = (scsi_block_range*)
malloc(trimData->range_count * sizeof(*blockRanges));
if (blockRanges == NULL)
return B_NO_MEMORY;
MemoryDeleter deleter(blockRanges);
for (uint32 i = 0; i < trimData->range_count; i++) {
uint64 startBytes = trimData->ranges[i].offset;
uint64 sizeBytes = trimData->ranges[i].size;
uint32 blockSize = device->block_size;
// Align to a block boundary so we don't discard blocks
// that could also contain some other data
uint64 blockOffset = startBytes % blockSize;
if (blockOffset == 0) {
blockRanges[i].lba = startBytes / blockSize;
blockRanges[i].size = sizeBytes / blockSize;
} else {
blockRanges[i].lba = startBytes / blockSize + 1;
blockRanges[i].size = (sizeBytes - (blockSize - blockOffset))
/ blockSize;
}
}
// Check ranges against device capacity and make them fit
for (uint32 i = 0; i < trimData->range_count; i++) {
if (blockRanges[i].lba >= device->capacity) {
dprintf("trim_device(): range offset (LBA) %" B_PRIu64
" exceeds device capacity %" B_PRIu64 "\n",
blockRanges[i].lba, device->capacity);
return B_BAD_VALUE;
}
uint64 maxSize = device->capacity - blockRanges[i].lba;
blockRanges[i].size = min_c(blockRanges[i].size, maxSize);
}
uint64 trimmedBlocks;
status_t status = sSCSIPeripheral->trim_device(device->scsi_periph_device,
request, blockRanges, trimData->range_count, &trimmedBlocks);
device->scsi->free_ccb(request);
// Some blocks may have been trimmed even if trim_device returns a failure
trimData->trimmed_size = trimmedBlocks * device->block_size;
return status;
}
static status_t
do_io(void* cookie, IOOperation* operation)
{
das_driver_info* info = (das_driver_info*)cookie;
// TODO: this can go away as soon as we pushed the IOOperation to the upper
// layers - we can then set scsi_periph::io() as callback for the scheduler
size_t bytesTransferred;
status_t status = sSCSIPeripheral->io(info->scsi_periph_device, operation,
&bytesTransferred);
info->io_scheduler->OperationCompleted(operation, status, bytesTransferred);
return status;
}
// #pragma mark - device module API
static status_t
das_init_device(void* _info, void** _cookie)
{
das_driver_info* info = (das_driver_info*)_info;
// and get (initial) capacity
scsi_ccb *request = info->scsi->alloc_ccb(info->scsi_device);
if (request == NULL)
return B_NO_MEMORY;
sSCSIPeripheral->check_capacity(info->scsi_periph_device, request);
info->scsi->free_ccb(request);
*_cookie = info;
return B_OK;
}
static void
das_uninit_device(void* _cookie)
{
das_driver_info* info = (das_driver_info*)_cookie;
delete info->io_scheduler;
}
static status_t
das_open(void* _info, const char* path, int openMode, void** _cookie)
{
das_driver_info* info = (das_driver_info*)_info;
das_handle* handle = (das_handle*)malloc(sizeof(das_handle));
if (handle == NULL)
return B_NO_MEMORY;
handle->info = info;
status_t status = sSCSIPeripheral->handle_open(info->scsi_periph_device,
(periph_handle_cookie)handle, &handle->scsi_periph_handle);
if (status < B_OK) {
free(handle);
return status;
}
*_cookie = handle;
return B_OK;
}
static status_t
das_close(void* cookie)
{
das_handle* handle = (das_handle*)cookie;
TRACE("close()\n");
sSCSIPeripheral->handle_close(handle->scsi_periph_handle);
return B_OK;
}
static status_t
das_free(void* cookie)
{
das_handle* handle = (das_handle*)cookie;
TRACE("free()\n");
sSCSIPeripheral->handle_free(handle->scsi_periph_handle);
free(handle);
return B_OK;
}
static status_t
das_io(void *cookie, io_request *request)
{
das_handle* handle = (das_handle*)cookie;
return handle->info->io_scheduler->ScheduleRequest(request);
}
static status_t
das_ioctl(void* cookie, uint32 op, void* buffer, size_t length)
{
das_handle* handle = (das_handle*)cookie;
das_driver_info* info = handle->info;
TRACE("ioctl(op = %" B_PRIu32 ")\n", op);
switch (op) {
case B_GET_DEVICE_SIZE:
{
status_t status = update_capacity(info);
if (status != B_OK)
return status;
size_t size = info->capacity * info->block_size;
return user_memcpy(buffer, &size, sizeof(size_t));
}
case B_GET_GEOMETRY:
{
if (buffer == NULL || length > sizeof(device_geometry))
return B_BAD_VALUE;
device_geometry geometry;
status_t status = get_geometry(handle, &geometry);
if (status != B_OK)
return status;
return user_memcpy(buffer, &geometry, length);
}
case B_GET_ICON_NAME:
// TODO: take device type into account!
return user_strlcpy((char*)buffer, info->removable
? "devices/drive-removable-media" : "devices/drive-harddisk",
B_FILE_NAME_LENGTH);
case B_GET_VECTOR_ICON:
{
// TODO: take device type into account!
device_icon iconData;
if (length != sizeof(device_icon))
return B_BAD_VALUE;
if (user_memcpy(&iconData, buffer, sizeof(device_icon)) != B_OK)
return B_BAD_ADDRESS;
if (iconData.icon_size >= (int32)sizeof(kDriveIcon)) {
if (user_memcpy(iconData.icon_data, kDriveIcon,
sizeof(kDriveIcon)) != B_OK)
return B_BAD_ADDRESS;
}
iconData.icon_size = sizeof(kDriveIcon);
return user_memcpy(buffer, &iconData, sizeof(device_icon));
}
case B_EJECT_DEVICE:
case B_SCSI_EJECT:
return load_eject(info, false);
case B_LOAD_MEDIA:
return load_eject(info, true);
case B_FLUSH_DRIVE_CACHE:
return synchronize_cache(info);
case B_TRIM_DEVICE:
{
// We know the buffer is kernel-side because it has been
// preprocessed in devfs
ASSERT(IS_KERNEL_ADDRESS(buffer));
return trim_device(info, (fs_trim_data*)buffer);
}
default:
return sSCSIPeripheral->ioctl(handle->scsi_periph_handle, op,
buffer, length);
}
}
// #pragma mark - scsi_periph callbacks
static void
das_set_capacity(das_driver_info* info, uint64 capacity, uint32 blockSize, uint32 physicalBlockSize)
{
TRACE("das_set_capacity(device = %p, capacity = %" B_PRIu64
", blockSize = %" B_PRIu32 ")\n", info, capacity, blockSize);
info->capacity = capacity;
if (info->block_size != blockSize) {
if (info->block_size != 0) {
dprintf("old %" B_PRId32 ", new %" B_PRId32 "\n", info->block_size,
blockSize);
panic("updating DMAResource not yet implemented...");
}
// TODO: we need to replace the DMAResource in our IOScheduler
status_t status = info->dma_resource->Init(info->node, blockSize, 1024,
32);
if (status != B_OK)
panic("initializing DMAResource failed: %s", strerror(status));
info->io_scheduler = new(std::nothrow) IOSchedulerSimple(
info->dma_resource);
if (info->io_scheduler == NULL)
panic("allocating IOScheduler failed.");
// TODO: use whole device name here
status = info->io_scheduler->Init("scsi");
if (status != B_OK)
panic("initializing IOScheduler failed: %s", strerror(status));
info->io_scheduler->SetCallback(do_io, info);
}
info->block_size = blockSize;
info->physical_block_size = physicalBlockSize;
}
static void
das_media_changed(das_driver_info *device, scsi_ccb *request)
{
// do a capacity check
// TODO: is this a good idea (e.g. if this is an empty CD)?
sSCSIPeripheral->check_capacity(device->scsi_periph_device, request);
}
scsi_periph_callbacks callbacks = {
(void (*)(periph_device_cookie, uint64, uint32, uint32))das_set_capacity,
(void (*)(periph_device_cookie, scsi_ccb *))das_media_changed
};
// #pragma mark - driver module API
static float
das_supports_device(device_node *parent)
{
const char *bus;
uint8 deviceType;
// make sure parent is really the SCSI bus manager
if (sDeviceManager->get_attr_string(parent, B_DEVICE_BUS, &bus, false))
return -1;
if (strcmp(bus, "scsi"))
return 0.0;
// check whether it's really a Direct Access Device
if (sDeviceManager->get_attr_uint8(parent, SCSI_DEVICE_TYPE_ITEM,
&deviceType, true) != B_OK || deviceType != scsi_dev_direct_access)
return 0.0;
return 0.6;
}
/*! Called whenever a new device was added to system;
if we really support it, we create a new node that gets
server by the block_io module
*/
static status_t
das_register_device(device_node *node)
{
const scsi_res_inquiry *deviceInquiry = NULL;
size_t inquiryLength;
uint32 maxBlocks;
// get inquiry data
if (sDeviceManager->get_attr_raw(node, SCSI_DEVICE_INQUIRY_ITEM,
(const void **)&deviceInquiry, &inquiryLength, true) != B_OK
|| inquiryLength < sizeof(scsi_res_inquiry))
return B_ERROR;
// get block limit of underlying hardware to lower it (if necessary)
if (sDeviceManager->get_attr_uint32(node, B_DMA_MAX_TRANSFER_BLOCKS,
&maxBlocks, true) != B_OK)
maxBlocks = INT_MAX;
// using 10 byte commands, at most 0xffff blocks can be transmitted at once
// (sadly, we cannot update this value later on if only 6 byte commands
// are supported, but the block_io module can live with that)
maxBlocks = min_c(maxBlocks, 0xffff);
// ready to register
device_attr attrs[] = {
{ B_DEVICE_PRETTY_NAME, B_STRING_TYPE, { .string = "SCSI Disk" }},
// tell block_io whether the device is removable
{"removable", B_UINT8_TYPE, {.ui8 = deviceInquiry->removable_medium}},
// impose own max block restriction
{B_DMA_MAX_TRANSFER_BLOCKS, B_UINT32_TYPE, {.ui32 = maxBlocks}},
{ NULL }
};
return sDeviceManager->register_node(node, SCSI_DISK_DRIVER_MODULE_NAME,
attrs, NULL, NULL);
}
static status_t
das_init_driver(device_node *node, void **cookie)
{
TRACE("das_init_driver");
uint8 removable;
status_t status = sDeviceManager->get_attr_uint8(node, "removable",
&removable, false);
if (status != B_OK)
return status;
das_driver_info* info = (das_driver_info*)malloc(sizeof(das_driver_info));
if (info == NULL)
return B_NO_MEMORY;
memset(info, 0, sizeof(*info));
info->dma_resource = new(std::nothrow) DMAResource;
if (info->dma_resource == NULL) {
free(info);
return B_NO_MEMORY;
}
info->node = node;
info->removable = removable;
device_node* parent = sDeviceManager->get_parent_node(node);
sDeviceManager->get_driver(parent, (driver_module_info **)&info->scsi,
(void **)&info->scsi_device);
sDeviceManager->put_node(parent);
status = sSCSIPeripheral->register_device((periph_device_cookie)info,
&callbacks, info->scsi_device, info->scsi, info->node,
info->removable, 10, &info->scsi_periph_device);
if (status != B_OK) {
delete info->dma_resource;
free(info);
return status;
}
*cookie = info;
return B_OK;
}
static void
das_uninit_driver(void *_cookie)
{
das_driver_info* info = (das_driver_info*)_cookie;
sSCSIPeripheral->unregister_device(info->scsi_periph_device);
delete info->dma_resource;
free(info);
}
static status_t
das_register_child_devices(void* _cookie)
{
das_driver_info* info = (das_driver_info*)_cookie;
status_t status;
char* name = sSCSIPeripheral->compose_device_name(info->node,
"disk/scsi");
if (name == NULL)
return B_ERROR;
status = sDeviceManager->publish_device(info->node, name,
SCSI_DISK_DEVICE_MODULE_NAME);
free(name);
return status;
}
static status_t
das_rescan_child_devices(void* _cookie)
{
das_driver_info* info = (das_driver_info*)_cookie;
uint64 capacity = info->capacity;
update_capacity(info);
if (info->capacity != capacity)
sSCSIPeripheral->media_changed(info->scsi_periph_device);
return B_OK;
}
module_dependency module_dependencies[] = {
{SCSI_PERIPH_MODULE_NAME, (module_info**)&sSCSIPeripheral},
{B_DEVICE_MANAGER_MODULE_NAME, (module_info**)&sDeviceManager},
{}
};
struct device_module_info sSCSIDiskDevice = {
{
SCSI_DISK_DEVICE_MODULE_NAME,
0,
NULL
},
das_init_device,
das_uninit_device,
NULL, //das_remove,
das_open,
das_close,
das_free,
NULL, // read
NULL, // write
das_io,
das_ioctl,
NULL, // select
NULL, // deselect
};
struct driver_module_info sSCSIDiskDriver = {
{
SCSI_DISK_DRIVER_MODULE_NAME,
0,
NULL
},
das_supports_device,
das_register_device,
das_init_driver,
das_uninit_driver,
das_register_child_devices,
das_rescan_child_devices,
NULL, // removed
};
module_info* modules[] = {
(module_info*)&sSCSIDiskDriver,
(module_info*)&sSCSIDiskDevice,
NULL
};