On Mon, 16 Jul 2007 18:15:41 +0200
Geert Uytterhoeven <[email protected]> wrote:
> From: Geert Uytterhoeven <[email protected]>
>
> Add a BD/DVD/CD-ROM 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
>
> --- /dev/null
> +++ b/drivers/scsi/ps3rom.c
> @@ -0,0 +1,538 @@
> +/*
> + * PS3 BD/DVD/CD-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 <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)
> +
> +
> +struct ps3rom_private {
> + struct ps3_storage_device *dev;
> + struct scsi_cmnd *curr_cmd;
> +};
> +#define ps3rom_priv(dev) ((dev)->sbd.core.driver_data)
> +
Someone should invent a keyboard which delivers an electric shock when the
operator types "#define". In the meanwhile, I get to do the honours.
Please don't implement in a macro anything which can be implemented in C.
> +
> +#define LV1_STORAGE_SEND_ATAPI_COMMAND (1)
> +
> +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
> +};
> +
>
> ...
>
> +/*
> + * 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_IRQ0);
> + if (!kaddr)
> + return -1;
kmap_atomic() cannot fail. On i386, at least. If it can fail on any other
arch then we have a biiiiig problem. (Multiple instances of this)
> + len = sgpnt->length;
> + if ((req_len + len) > buflen) {
> + active = 0;
> + len = buflen - req_len;
> + }
> + memcpy(kaddr + sgpnt->offset, buf + req_len, len);
> + flush_kernel_dcache_page(sgpnt->page);
> + kunmap_atomic(kaddr, KM_IRQ0);
> + act_len += len;
> + }
> + req_len += sgpnt->length;
> + }
> + cmd->resid = req_len - act_len;
> + return 0;
> +}
> +
-
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