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    Subject[patch 5/6] ps3: ROM Storage Driver
    From: Geert Uytterhoeven <Geert.Uytterhoeven@sonycom.com>

    Add a CD/DVD/BD Storage Driver for the PS3:
    - Implemented as a SCSI device driver
    - Uses software scatter-gather with a 64 KiB bounce buffer as the hypervisor
    doesn't support scatter-gather

    CC: Geoff Levand <geoffrey.levand@am.sony.com>
    Signed-off-by: Geert Uytterhoeven <Geert.Uytterhoeven@sonycom.com>
    ---
    Changes since previous submission:
    o Don't use `default y' in Kconfig
    o Add missing #include <linux/highmem.h>
    o Remove ps3rom_private.scsi_done, use scsi_cmnd.scsi_done instead
    o Use scsi_device.host.hostdata
    o Remove empty ps3rom_slave_{alloc,destroy}()
    o Kill superfluous test for command in progress
    o Move scsi_host_put() last in cleanup sequence
    o Remove scsi_command(), use scsi_print_command() for debugging
    o scsi_cmnd.use_sg is always > 0 these days
    o Allocate struct ps3rom_private using scsi_host_alloc()
    o Remove the thread for handling requests
    o Remove unused position parameter enum
    o Remove unused NA_PROTO and DIR_NA
    o Derive buffer length, data direction, and transfer protocol from the
    struct scsi_command, instead of using a big switch() statement
    o Kill superfluous spinlock
    o Remove manual request sense, as modern hypervisors always do auto sense
    o Pass all SCSI commands to the hypervisor as ATAPI commands, except for
    READ_*/WRITE_*
    o Don't print errors for SCSI commands that are not allowed for an
    Other OS by the hypervisor
    o Remove superfluous tests for data directions in
    {fill_from,fetch_to}_dev_buffer()
    o Handle errors in {fill_from,fetch_to}_dev_buffer()
    o Reorder routines
    o Manually inline ps3rom_send_atapi_command()
    o Fix all FIXMEs

    arch/powerpc/platforms/ps3/Kconfig | 10
    drivers/scsi/Makefile | 1
    drivers/scsi/ps3rom.c | 568 +++++++++++++++++++++++++++++++++++++
    3 files changed, 579 insertions(+)

    --- a/arch/powerpc/platforms/ps3/Kconfig
    +++ b/arch/powerpc/platforms/ps3/Kconfig
    @@ -112,4 +112,14 @@ config PS3_DISK
    This support is required to access the PS3 hard disk.
    In general, all users will say Y or M.

    +config PS3_ROM
    + tristate "PS3 ROM Storage Driver"
    + depends on PPC_PS3 && BLK_DEV_SR
    + select PS3_STORAGE
    + help
    + Include support for the PS3 ROM Storage.
    +
    + This support is required to access the PS3 BD/DVD/CD-ROM drive.
    + In general, all users will say Y or M.
    +
    endmenu
    --- a/drivers/scsi/Makefile
    +++ b/drivers/scsi/Makefile
    @@ -132,6 +132,7 @@ obj-$(CONFIG_SCSI_IBMVSCSI) += ibmvscsi/
    obj-$(CONFIG_SCSI_IBMVSCSIS) += ibmvscsi/
    obj-$(CONFIG_SCSI_HPTIOP) += hptiop.o
    obj-$(CONFIG_SCSI_STEX) += stex.o
    +obj-$(CONFIG_PS3_ROM) += ps3rom.o

    obj-$(CONFIG_ARM) += arm/

    --- /dev/null
    +++ b/drivers/scsi/ps3rom.c
    @@ -0,0 +1,568 @@
    +/*
    + * PS3 ROM Storage Driver
    + *
    + * Copyright (C) 2007 Sony Computer Entertainment Inc.
    + * Copyright 2007 Sony Corp.
    + *
    + * This program is free software; you can redistribute it and/or modify it
    + * under the terms of the GNU General Public License as published
    + * by the Free Software Foundation; version 2 of the License.
    + *
    + * This program is distributed in the hope that it will be useful, but
    + * WITHOUT ANY WARRANTY; without even the implied warranty of
    + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
    + * General Public License for more details.
    + *
    + * You should have received a copy of the GNU General Public License along
    + * with this program; if not, write to the Free Software Foundation, Inc.,
    + * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
    + */
    +
    +#include <linux/cdrom.h>
    +#include <linux/highmem.h>
    +#include <linux/interrupt.h>
    +#include <linux/kthread.h>
    +
    +#include <scsi/scsi.h>
    +#include <scsi/scsi_cmnd.h>
    +#include <scsi/scsi_dbg.h>
    +#include <scsi/scsi_device.h>
    +#include <scsi/scsi_host.h>
    +
    +#include <asm/lv1call.h>
    +#include <asm/ps3stor.h>
    +
    +
    +#define DEVICE_NAME "ps3rom"
    +
    +#define BOUNCE_SIZE (64*1024)
    +
    +#define PS3ROM_MAX_SECTORS (BOUNCE_SIZE / CD_FRAMESIZE)
    +
    +#define LV1_STORAGE_SEND_ATAPI_COMMAND (1)
    +
    +
    +struct ps3rom_private {
    + struct ps3_storage_device *dev;
    + struct scsi_cmnd *cmd;
    +};
    +#define ps3rom_priv(dev) ((dev)->sbd.core.driver_data)
    +
    +struct lv1_atapi_cmnd_block {
    + u8 pkt[32]; /* packet command block */
    + u32 pktlen; /* should be 12 for ATAPI 8020 */
    + u32 blocks;
    + u32 block_size;
    + u32 proto; /* transfer mode */
    + u32 in_out; /* transfer direction */
    + u64 buffer; /* parameter except command block */
    + u32 arglen; /* length above */
    +};
    +
    +enum lv1_atapi_proto {
    + NON_DATA_PROTO = 0,
    + PIO_DATA_IN_PROTO = 1,
    + PIO_DATA_OUT_PROTO = 2,
    + DMA_PROTO = 3
    +};
    +
    +enum lv1_atapi_in_out {
    + DIR_WRITE = 0, /* memory -> device */
    + DIR_READ = 1 /* device -> memory */
    +};
    +
    +
    +static int ps3rom_slave_configure(struct scsi_device *scsi_dev)
    +{
    + struct ps3rom_private *priv;
    + struct ps3_storage_device *dev;
    +
    + priv = (struct ps3rom_private *)scsi_dev->host->hostdata;
    + dev = priv->dev;
    + dev_dbg(&dev->sbd.core, "%s:%u: id %u, lun %u, channel %u\n", __func__,
    + __LINE__, scsi_dev->id, scsi_dev->lun, scsi_dev->channel);
    +
    + /*
    + * ATAPI SFF8020 devices use MODE_SENSE_10,
    + * so we can prohibit MODE_SENSE_6
    + */
    + scsi_dev->use_10_for_ms = 1;
    +
    + return 0;
    +}
    +
    +/*
    + * copy data from device into scatter/gather buffer
    + */
    +static int fill_from_dev_buffer(struct scsi_cmnd *cmd, const void *buf)
    +{
    + int k, req_len, act_len, len, active;
    + void *kaddr;
    + struct scatterlist *sgpnt;
    + unsigned int buflen;
    +
    + buflen = cmd->request_bufflen;
    + if (!buflen)
    + return 0;
    +
    + if (!cmd->request_buffer)
    + return -1;
    +
    + sgpnt = cmd->request_buffer;
    + active = 1;
    + for (k = 0, req_len = 0, act_len = 0; k < cmd->use_sg; ++k, ++sgpnt) {
    + if (active) {
    + kaddr = kmap_atomic(sgpnt->page, KM_USER0);
    + if (!kaddr)
    + return -1;
    + len = sgpnt->length;
    + if ((req_len + len) > buflen) {
    + active = 0;
    + len = buflen - req_len;
    + }
    + memcpy(kaddr + sgpnt->offset, buf + req_len, len);
    + kunmap_atomic(kaddr, KM_USER0);
    + act_len += len;
    + }
    + req_len += sgpnt->length;
    + }
    + cmd->resid = req_len - act_len;
    + return 0;
    +}
    +
    +/*
    + * copy data from scatter/gather into device's buffer
    + */
    +static int fetch_to_dev_buffer(struct scsi_cmnd *cmd, void *buf)
    +{
    + int k, req_len, len, fin;
    + void *kaddr;
    + struct scatterlist *sgpnt;
    + unsigned int buflen;
    +
    + buflen = cmd->request_bufflen;
    + if (!buflen)
    + return 0;
    +
    + if (!cmd->request_buffer)
    + return -1;
    +
    + sgpnt = cmd->request_buffer;
    + for (k = 0, req_len = 0, fin = 0; k < cmd->use_sg; ++k, ++sgpnt) {
    + kaddr = kmap_atomic(sgpnt->page, KM_USER0);
    + if (!kaddr)
    + return -1;
    + len = sgpnt->length;
    + if ((req_len + len) > buflen) {
    + len = buflen - req_len;
    + fin = 1;
    + }
    + memcpy(buf + req_len, kaddr + sgpnt->offset, len);
    + kunmap_atomic(kaddr, KM_USER0);
    + if (fin)
    + return req_len + len;
    + req_len += sgpnt->length;
    + }
    + return req_len;
    +}
    +
    +static int ps3rom_atapi_request(struct ps3_storage_device *dev,
    + struct scsi_cmnd *cmd)
    +{
    + struct lv1_atapi_cmnd_block atapi_cmnd;
    + unsigned char opcode = cmd->cmnd[0];
    + int res;
    + u64 lpar;
    +
    + dev_dbg(&dev->sbd.core, "%s:%u: send ATAPI command 0x%02x\n", __func__,
    + __LINE__, opcode);
    +
    + memset(&atapi_cmnd, 0, sizeof(struct lv1_atapi_cmnd_block));
    + memcpy(&atapi_cmnd.pkt, cmd->cmnd, 12);
    + atapi_cmnd.pktlen = 12;
    + atapi_cmnd.block_size = 1; /* transfer size is block_size * blocks */
    + atapi_cmnd.blocks = atapi_cmnd.arglen = cmd->request_bufflen;
    + atapi_cmnd.buffer = dev->bounce_lpar;
    +
    + switch (cmd->sc_data_direction) {
    + case DMA_FROM_DEVICE:
    + if (cmd->request_bufflen >= CD_FRAMESIZE)
    + atapi_cmnd.proto = DMA_PROTO;
    + else
    + atapi_cmnd.proto = PIO_DATA_IN_PROTO;
    + atapi_cmnd.in_out = DIR_READ;
    + break;
    +
    + case DMA_TO_DEVICE:
    + if (cmd->request_bufflen >= CD_FRAMESIZE)
    + atapi_cmnd.proto = DMA_PROTO;
    + else
    + atapi_cmnd.proto = PIO_DATA_OUT_PROTO;
    + atapi_cmnd.in_out = DIR_WRITE;
    + res = fetch_to_dev_buffer(cmd, dev->bounce_buf);
    + if (res < 0)
    + return DID_ERROR << 16;
    + break;
    +
    + default:
    + atapi_cmnd.proto = NON_DATA_PROTO;
    + break;
    + }
    +
    + lpar = ps3_mm_phys_to_lpar(__pa(&atapi_cmnd));
    + res = lv1_storage_send_device_command(dev->sbd.dev_id,
    + LV1_STORAGE_SEND_ATAPI_COMMAND,
    + lpar, sizeof(atapi_cmnd),
    + atapi_cmnd.buffer,
    + atapi_cmnd.arglen, &dev->tag);
    + if (res == LV1_DENIED_BY_POLICY) {
    + dev_dbg(&dev->sbd.core,
    + "%s:%u: ATAPI command 0x%02x denied by policy\n",
    + __func__, __LINE__, opcode);
    + return DID_ERROR << 16;
    + }
    +
    + if (res) {
    + dev_err(&dev->sbd.core,
    + "%s:%u: ATAPI command 0x%02x failed %d\n", __func__,
    + __LINE__, opcode, res);
    + return DID_ERROR << 16;
    + }
    +
    + return 0;
    +}
    +
    +static inline unsigned int srb6_lba(const struct scsi_cmnd *cmd)
    +{
    + /* LUN is always zero */
    + return cmd->cmnd[1] << 16 | cmd->cmnd[2] << 8 | cmd->cmnd[3];
    +}
    +
    +static inline unsigned int srb6_len(const struct scsi_cmnd *cmd)
    +{
    + return cmd->cmnd[4];
    +}
    +
    +static inline unsigned int srb10_lba(const struct scsi_cmnd *cmd)
    +{
    + return cmd->cmnd[2] << 24 | cmd->cmnd[3] << 16 | cmd->cmnd[4] << 8 |
    + cmd->cmnd[5];
    +}
    +
    +static inline unsigned int srb10_len(const struct scsi_cmnd *cmd)
    +{
    + return cmd->cmnd[7] << 8 | cmd->cmnd[8];
    +}
    +
    +static int ps3rom_read_request(struct ps3_storage_device *dev,
    + struct scsi_cmnd *cmd, u32 start_sector,
    + u32 sectors)
    +{
    + int res;
    +
    + dev_dbg(&dev->sbd.core, "%s:%u: read %u sectors starting at %u\n",
    + __func__, __LINE__, sectors, start_sector);
    +
    + res = lv1_storage_read(dev->sbd.dev_id,
    + dev->regions[dev->region_idx].id, start_sector,
    + sectors, 0, dev->bounce_lpar, &dev->tag);
    + if (res) {
    + dev_err(&dev->sbd.core, "%s:%u: read failed %d\n", __func__,
    + __LINE__, res);
    + return DID_ERROR << 16;
    + }
    +
    + return 0;
    +}
    +
    +static int ps3rom_write_request(struct ps3_storage_device *dev,
    + struct scsi_cmnd *cmd, u32 start_sector,
    + u32 sectors)
    +{
    + int res;
    +
    + dev_dbg(&dev->sbd.core, "%s:%u: write %u sectors starting at %u\n",
    + __func__, __LINE__, sectors, start_sector);
    +
    + res = fetch_to_dev_buffer(cmd, dev->bounce_buf);
    + if (res < 0)
    + return DID_ERROR << 16;
    +
    + res = lv1_storage_write(dev->sbd.dev_id,
    + dev->regions[dev->region_idx].id, start_sector,
    + sectors, 0, dev->bounce_lpar, &dev->tag);
    + if (res) {
    + dev_err(&dev->sbd.core, "%s:%u: write failed %d\n", __func__,
    + __LINE__, res);
    + return DID_ERROR << 16;
    + }
    +
    + return 0;
    +}
    +
    +static int ps3rom_queuecommand(struct scsi_cmnd *cmd,
    + void (*done)(struct scsi_cmnd *))
    +{
    + struct ps3rom_private *priv;
    + struct ps3_storage_device *dev;
    + unsigned char opcode;
    + int res;
    +
    +#ifdef DEBUG
    + scsi_print_command(cmd);
    +#endif
    +
    + priv = (struct ps3rom_private *)cmd->device->host->hostdata;
    + dev = priv->dev;
    + priv->cmd = cmd;
    + cmd->scsi_done = done;
    +
    + opcode = cmd->cmnd[0];
    + /*
    + * While we can submit READ/WRITE SCSI commands as ATAPI commands,
    + * it's recommended to use lv1_storage_{read,write}() instead
    + */
    + switch (opcode) {
    + case READ_6:
    + res = ps3rom_read_request(dev, cmd, srb6_lba(cmd),
    + srb6_len(cmd));
    + break;
    +
    + case READ_10:
    + res = ps3rom_read_request(dev, cmd, srb10_lba(cmd),
    + srb10_len(cmd));
    + break;
    +
    + case WRITE_6:
    + res = ps3rom_write_request(dev, cmd, srb6_lba(cmd),
    + srb6_len(cmd));
    + break;
    +
    + case WRITE_10:
    + res = ps3rom_write_request(dev, cmd, srb10_lba(cmd),
    + srb10_len(cmd));
    + break;
    +
    + default:
    + res = ps3rom_atapi_request(dev, cmd);
    + break;
    + }
    +
    + if (res) {
    + memset(cmd->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
    + cmd->result = res;
    + cmd->sense_buffer[0] = 0x70;
    + cmd->sense_buffer[2] = ILLEGAL_REQUEST;
    + priv->cmd = NULL;
    + cmd->scsi_done(cmd);
    + }
    +
    + return 0;
    +}
    +
    +static int decode_lv1_status(u64 status, unsigned char *sense_key,
    + unsigned char *asc, unsigned char *ascq)
    +{
    + if (((status >> 24) & 0xff) != SAM_STAT_CHECK_CONDITION)
    + return -1;
    +
    + *sense_key = (status >> 16) & 0xff;
    + *asc = (status >> 8) & 0xff;
    + *ascq = status & 0xff;
    + return 0;
    +}
    +
    +static irqreturn_t ps3rom_interrupt(int irq, void *data)
    +{
    + struct ps3_storage_device *dev = data;
    + struct Scsi_Host *host;
    + struct ps3rom_private *priv;
    + struct scsi_cmnd *cmd;
    + int res;
    + u64 tag, status;
    + unsigned char sense_key, asc, ascq;
    +
    + res = lv1_storage_get_async_status(dev->sbd.dev_id, &tag, &status);
    + /*
    + * status = -1 may mean that ATAPI transport completed OK, but
    + * ATAPI command itself resulted CHECK CONDITION
    + * so, upper layer should issue REQUEST_SENSE to check the sense data
    + */
    +
    + if (tag != dev->tag)
    + dev_err(&dev->sbd.core,
    + "%s:%u: tag mismatch, got %lx, expected %lx\n",
    + __func__, __LINE__, tag, dev->tag);
    +
    + if (res) {
    + dev_err(&dev->sbd.core, "%s:%u: res=%d status=0x%lx\n",
    + __func__, __LINE__, res, status);
    + return IRQ_HANDLED;
    + }
    +
    + host = ps3rom_priv(dev);
    + priv = (struct ps3rom_private *)host->hostdata;
    + cmd = priv->cmd;
    +
    + if (!status) {
    + /* OK, completed */
    + if (cmd->sc_data_direction == DMA_FROM_DEVICE) {
    + res = fill_from_dev_buffer(cmd, dev->bounce_buf);
    + if (res) {
    + cmd->result = DID_ERROR << 16;
    + goto done;
    + }
    + }
    + cmd->result = DID_OK << 16;
    + goto done;
    + }
    +
    + if (cmd->cmnd[0] == REQUEST_SENSE) {
    + /* SCSI spec says request sense should never get error */
    + dev_err(&dev->sbd.core, "%s:%u: end error without autosense\n",
    + __func__, __LINE__);
    + cmd->result = DID_ERROR << 16 | SAM_STAT_CHECK_CONDITION;
    + goto done;
    + }
    +
    + if (decode_lv1_status(status, &sense_key, &asc, &ascq)) {
    + cmd->result = DID_ERROR << 16;
    + goto done;
    + }
    +
    + cmd->sense_buffer[0] = 0x70;
    + cmd->sense_buffer[2] = sense_key;
    + cmd->sense_buffer[7] = 16 - 6;
    + cmd->sense_buffer[12] = asc;
    + cmd->sense_buffer[13] = ascq;
    + cmd->result = SAM_STAT_CHECK_CONDITION;
    +
    +done:
    + priv->cmd = NULL;
    + cmd->scsi_done(cmd);
    + return IRQ_HANDLED;
    +}
    +
    +static struct scsi_host_template ps3rom_host_template = {
    + .name = DEVICE_NAME,
    + .slave_configure = ps3rom_slave_configure,
    + .queuecommand = ps3rom_queuecommand,
    + .can_queue = 1,
    + .this_id = 7,
    + .sg_tablesize = SG_ALL,
    + .cmd_per_lun = 1,
    + .emulated = 1, /* only sg driver uses this */
    + .max_sectors = PS3ROM_MAX_SECTORS,
    + .use_clustering = ENABLE_CLUSTERING,
    + .module = THIS_MODULE,
    +};
    +
    +
    +static int __devinit ps3rom_probe(struct ps3_system_bus_device *_dev)
    +{
    + struct ps3_storage_device *dev = to_ps3_storage_device(&_dev->core);
    + int error;
    + struct Scsi_Host *host;
    + struct ps3rom_private *priv;
    +
    + if (dev->blk_size != CD_FRAMESIZE) {
    + dev_err(&dev->sbd.core,
    + "%s:%u: cannot handle block size %lu\n", __func__,
    + __LINE__, dev->blk_size);
    + return -EINVAL;
    + }
    +
    + dev->bounce_size = BOUNCE_SIZE;
    + dev->bounce_buf = kmalloc(BOUNCE_SIZE, GFP_DMA);
    + if (!dev->bounce_buf) {
    + return -ENOMEM;
    + }
    +
    + error = ps3stor_setup(dev);
    + if (error)
    + goto fail_free_bounce;
    +
    + /* override the interrupt handler */
    + free_irq(dev->irq, dev);
    + error = request_irq(dev->irq, ps3rom_interrupt, IRQF_DISABLED,
    + dev->sbd.core.driver->name, dev);
    + if (error) {
    + dev_err(&dev->sbd.core, "%s:%u: request_irq failed %d\n",
    + __func__, __LINE__, error);
    + goto fail_teardown;
    + }
    +
    + host = scsi_host_alloc(&ps3rom_host_template,
    + sizeof(struct ps3rom_private));
    + if (!host) {
    + dev_err(&dev->sbd.core, "%s:%u: scsi_host_alloc failed\n",
    + __func__, __LINE__);
    + goto fail_teardown;
    + }
    +
    + priv = (struct ps3rom_private *)host->hostdata;
    + ps3rom_priv(dev) = host;
    + priv->dev = dev;
    +
    + /* One device/LUN per SCSI bus */
    + host->max_id = 1;
    + host->max_lun = 1;
    +
    + error = scsi_add_host(host, &dev->sbd.core);
    + if (error) {
    + dev_err(&dev->sbd.core, "%s:%u: scsi_host_alloc failed %d\n",
    + __func__, __LINE__, error);
    + error = -ENODEV;
    + goto fail_host_put;
    + }
    +
    + scsi_scan_host(host);
    + return 0;
    +
    +fail_host_put:
    + scsi_host_put(host);
    +fail_teardown:
    + ps3stor_teardown(dev);
    +fail_free_bounce:
    + kfree(dev->bounce_buf);
    + return error;
    +}
    +
    +static int ps3rom_remove(struct ps3_system_bus_device *_dev)
    +{
    + struct ps3_storage_device *dev = to_ps3_storage_device(&_dev->core);
    + struct Scsi_Host *host = ps3rom_priv(dev);
    +
    + scsi_remove_host(host);
    + ps3stor_teardown(dev);
    + kfree(dev->bounce_buf);
    + scsi_host_put(host);
    + return 0;
    +}
    +
    +static struct ps3_system_bus_driver ps3rom = {
    + .match_id = PS3_MATCH_ID_STOR_ROM,
    + .core.name = DEVICE_NAME,
    + .core.owner = THIS_MODULE,
    + .probe = ps3rom_probe,
    + .remove = ps3rom_remove
    +};
    +
    +
    +static int __init ps3rom_init(void)
    +{
    + return ps3_system_bus_driver_register(&ps3rom);
    +}
    +
    +static void __exit ps3rom_exit(void)
    +{
    + ps3_system_bus_driver_unregister(&ps3rom);
    +}
    +
    +module_init(ps3rom_init);
    +module_exit(ps3rom_exit);
    +
    +MODULE_LICENSE("GPL");
    +MODULE_DESCRIPTION("PS3 ROM Storage Driver");
    +MODULE_AUTHOR("Sony Corporation");
    +MODULE_ALIAS(PS3_MODULE_ALIAS_STOR_ROM);
    --
    With kind regards,

    Geert Uytterhoeven
    Software Architect

    Sony Network and Software Technology Center Europe
    The Corporate Village · Da Vincilaan 7-D1 · B-1935 Zaventem · Belgium

    Phone: +32 (0)2 700 8453
    Fax: +32 (0)2 700 8622
    E-mail: Geert.Uytterhoeven@sonycom.com
    Internet: http://www.sony-europe.com/

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