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Message-ID: <4E44E782.7090309@fusionio.com>
Date: Fri, 12 Aug 2011 10:42:42 +0200
From: Jens Axboe <jaxboe@...ionio.com>
To: "Asai Thambi Samymuthu Pattrayasamy (asamymuthupa) [CONTRACTOR]"
<asamymuthupa@...ron.com>
CC: Alan Cox <alan@...rguk.ukuu.org.uk>,
Jeff Moyer <jmoyer@...hat.com>,
"linux-ide@...r.kernel.org" <linux-ide@...r.kernel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
Jeff Garzik <jgarzik@...ox.com>,
Christoph Hellwig <hch@...radead.org>
Subject: Re: [PATCH v3 2/3] drivers/block/mtip32xx: Adding source for hardware
related operations
On 2011-08-11 20:52, Asai Thambi Samymuthu Pattrayasamy (asamymuthupa) [CONTRACTOR] wrote:
> +#define HW_CMD_TBL_HDR_SZ 0x80
> +#define HW_RX_FIS_SZ 0x100
> +#define HW_CMD_SLOT_SZ (MTIP_MAX_COMMAND_SLOTS * 32)
> +#define HW_CMD_TBL_SZ (HW_CMD_TBL_HDR_SZ + (MTIP_MAX_SG * 16))
> +#define HW_CMD_TBL_AR_SZ (HW_CMD_TBL_SZ * MTIP_MAX_COMMAND_SLOTS)
> +#define HW_PORT_PRIV_DMA_SZ \
> + (HW_CMD_SLOT_SZ + HW_CMD_TBL_AR_SZ + HW_RX_FIS_SZ)
> +
> +#define HBA_CAPS 0x00
> +#define HOST_CTRL 0x04
> +#define HOST_IRQ_STAT 0x08
> +#define PORTS_IMPL 0x0c
> +#define VERSION 0x10
> +#define CCCC 0x14
> +#define CCCP 0x18
> +#define EML 0x1c
> +#define EMC 0x20
> +#define EX_HOST_CAP 0x24
> +
> +#define HOST_CAP_64 (1 << 31)
> +#define HOST_IRQ_EN (1 << 1)
> +#define HOST_RESET (1 << 0)
> +#define HOST_HSORG 0xFC
> +#define HSORG_DISABLE_SLOTGRP_INTR (1<<24)
> +#define HSORG_DISABLE_SLOTGRP_PXIS (1<<16)
> +#define HSORG_HWREV 0xFF00
> +#define HSORG_STYLE 0x8
> +#define HSORG_SLOTGROUPS 0x7
> +
> +#define PORT_LST_ADDR 0x00
> +#define PORT_LST_ADDR_HI 0x04
> +#define PORT_FIS_ADDR 0x08
> +#define PORT_FIS_ADDR_HI 0x0c
> +#define PORT_IRQ_STAT 0x10
> +#define PORT_IRQ_EN 0x14
> +#define PORT_CMD 0x18
> +#define PORT_TFDATA 0x20
> +#define PORT_SCR_STAT 0x28
> +#define PORT_SCR_CTL 0x2c
> +#define PORT_SCR_ERR 0x30
> +#define PORT_SACTIVE 0x34
> +#define PORT_COMMAND_ISSUE 0x38
> +#define PORT_SCR_NTF 0x3c
> +#define PORT_SDBV 0x7C
> +
> +#define PORT_CMD_ICC_ACTIVE (1 << 28)
> +#define PORT_CMD_LIST_ON (1 << 15)
> +#define PORT_CMD_FIS_RX (1 << 4)
> +#define PORT_CMD_CLO (1 << 3)
> +#define PORT_CMD_START (1 << 0)
> +#define PORT_OFFSET 0x100
> +#define PORT_MEM_SIZE 0x80
> +#define RX_FIS_D2H_REG 0x40
> +#define RX_FIS_PIO 0x20
> +
> +#define PORT_IRQ_COLD_PRES (1 << 31)
> +#define PORT_IRQ_TF_ERR (1 << 30)
> +#define PORT_IRQ_HBUS_ERR (1 << 29)
> +#define PORT_IRQ_HBUS_DATA_ERR (1 << 28)
> +#define PORT_IRQ_IF_ERR (1 << 27)
> +#define PORT_IRQ_IF_NONFATAL (1 << 26)
> +#define PORT_IRQ_OVERFLOW (1 << 24)
> +#define PORT_IRQ_BAD_PMP (1 << 23)
> +#define PORT_IRQ_PHYRDY (1 << 22)
> +#define PORT_IRQ_DEV_ILCK (1 << 7)
> +#define PORT_IRQ_CONNECT (1 << 6)
> +#define PORT_IRQ_DPS (1 << 5)
> +#define PORT_IRQ_UNK_FIS (1 << 4)
> +#define PORT_IRQ_SDB_FIS (1 << 3)
> +#define PORT_IRQ_DMAS_FIS (1 << 2)
> +#define PORT_IRQ_PIOS_FIS (1 << 1)
> +#define PORT_IRQ_D2H_REG_FIS (1 << 0)
Again lots of things that should be shared with ahci.
> +/*
> + * Obtain an empty command slot.
> + *
> + * This function needs to be reentrant since it could be called
> + * at the same time on multiple CPUs. The allocation of the
> + * command slot must be atomic.
> + *
> + * @port Pointer to the port data structure.
> + *
> + * return value
> + * >= 0 Index of command slot obtained.
> + * -1 No command slots available.
> + */
> +static int get_slot(struct mtip_port *port)
> +{
> + int slot, i;
> + unsigned int num_command_slots = port->dd->slot_groups * 32;
> +
> + /*
> + * Try 10 times, because there is a small race here.
> + * that's ok, because it's still cheaper than a lock.
> + */
Might want to expand on what that race is.
> +static irqreturn_t mtip_irq_handler(int irq, void *instance)
> +{
> + struct driver_data *dd = instance;
> +#ifdef MTIP_USE_TASKLET
> + tasklet_schedule(&dd->tasklet);
> + return IRQ_HANDLED;
> +#else
> + return mtip_handle_irq(dd);
> +#endif
> +}
Have you experimented with blk-iopoll?
> +/*
> + * Byte-swap ATA ID strings.
> + *
> + * ATA identify data contains strings in byte-swapped 16-bit words.
> + * They must be swapped (on all architectures) to be usable as C
> strings.
> + * This function swaps bytes in-place.
> + *
> + * @buf The buffer location of the string
> + * @len The number of bytes to swap
> + *
> + * return value
> + * None
> + */
> +static inline void ata_swap_string(u16 *buf, unsigned int len)
> +{
> + int i;
> + for (i = 0; i < (len/2); i++)
> + be16_to_cpus(&buf[i]);
> +}
I'm pretty sure we have the exact same thing in IDE and libata, so lets
put this somewhere we they can all use it.
Overall looks very clean. If you take care of the little things
mentioned by me and Christoph, I don't see anything stopping this from
being merged for 3.2.
--
Jens Axboe
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