On Sat, 2008-01-26 at 00:43 +0800, Ke Wei wrote:
> struct mvs_phy {
> struct mvs_port *port;
> struct asd_sas_phy sas_phy;
> + struct sas_identify identify;
> + __le32 dev_info;
> + __le64 dev_sas_addr;
> + __le32 att_dev_info;
> + __le64 att_dev_sas_addr;
> + u32 type;
> + __le32 phy_status;
> + __le32 irq_status;
> + u8 wide_port_phymap;
> + u32 frame_rcvd_size;
> + u8 frame_rcvd[32];
>
> - u8 frame_rcvd[24 + 1024];
> };
These __le quantites don't look right ... they're all read in by readl,
which will convert little endian to CPU anyway.
> @@ -437,27 +586,55 @@ struct mvs_info {
> dma_addr_t rx_dma;
> u32 rx_cons; /* RX consumer idx */
>
> - __le32 *rx_fis; /* RX'd FIS area */
> + void *rx_fis; /* RX'd FIS area */
Now the received FIS, on the other hand, provided you're storing it in
wire format (which you look to be) *is* little endian data by definition
in the ATA spec.
> -static void mvs_tag_clear(struct mvs_info *mvi, unsigned int tag)
> +static void mvs_tag_clear(struct mvs_info *mvi, u32 tag)
> {
> - mvi->tags[tag / sizeof(unsigned long)] &=
> - ~(1UL << (tag % sizeof(unsigned long)));
> + mvi->tag_in = (mvi->tag_in + 1) & (MVS_SLOTS - 1);
> + mvi->tags[mvi->tag_in] = tag;
> }
>
> -static void mvs_tag_set(struct mvs_info *mvi, unsigned int tag)
> +static void mvs_tag_free(struct mvs_info *mvi, u32 tag)
> {
> - mvi->tags[tag / sizeof(unsigned long)] |=
> - (1UL << (tag % sizeof(unsigned long)));
> + mvi->tag_out = (mvi->tag_out - 1) & (MVS_SLOTS - 1);
> }
>
> -static bool mvs_tag_test(struct mvs_info *mvi, unsigned int tag)
> +static int mvs_tag_alloc(struct mvs_info *mvi, u32 *tag_out)
> {
> - return mvi->tags[tag / sizeof(unsigned long)] &
> - (1UL << (tag % sizeof(unsigned long)));
> + if (mvi->tag_out != mvi->tag_in) {
> + *tag_out = mvi->tags[mvi->tag_out];
> + mvi->tag_out = (mvi->tag_out + 1) & (MVS_SLOTS - 1);
> + return 0;
> + }
> + return -EBUSY;
I really don't think you should be doing this. That single ring governs
all the potential tag slots for everything in this device. If you do a
simple head tail allocation, what can happen is that you get a slow tag
(attached to a format command, or a tape command) and then the ring head
will hit the slow tag and the entire device will halt. I think you need
a bitmap based allocation algorithm to ensure that if you have a free
tag anywhere, you'll use it.
If you look at the aic94xx index functions in aic94xx_hwi.h you'll see
asd_tc_index_get() and asd_tc_index_release() doing exactly what you
want with the native linux bitmap functions (the aic also uses a single
issue queue with indexes into it).
James
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