Minki/linux
1
0
Fork 1
mirror of https://github.com/torvalds/linux.git synced 2024-10-31 17:21:49 +00:00
Code Issues Packages Projects Releases Wiki Activity

[SCSI] advansys: Remove a couple of uses of bus_to_virt

Browse Source 
Replace ASC_VADDR_TO_U32 and ASC_U32_TO_VADDR with an auto-expanding
array that maps pointers to 32-bit IDs and back.  One of the uses of
ASC_VADDR_TO_U32 was in error; it should have been using ADV_VADDR_TO_U32.

Also replace the use of virt_to_bus when setting the sense_address with
a call to dma_map_single() followed by dma_cache_sync.  This part cribbed
from the 53c700 driver.

Signed-off-by: Matthew Wilcox <willy@linux.intel.com>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
This commit is contained in:
Matthew Wilcox 2007-10-02 21:55:40 -04:00 committed by James Bottomley
parent 52c334e945
commit b249c7fda2
1 changed files with 79 additions and 26 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

105
drivers/scsi/advansys.c
View File

@ -90,17 +90,6 @@
#define ASC_DCNT __u32 /* Unsigned Data count type. */
#define ASC_SDCNT __s32 /* Signed Data count type. */
/*
* These macros are used to convert a virtual address to a
* 32-bit value. This currently can be used on Linux Alpha
* which uses 64-bit virtual address but a 32-bit bus address.
* This is likely to break in the future, but doing this now
* will give us time to change the HW and FW to handle 64-bit
* addresses.
*/
#define ASC_VADDR_TO_U32 virt_to_bus
#define ASC_U32_TO_VADDR bus_to_virt
typedef unsigned char uchar;
#ifndef TRUE
@ -601,6 +590,8 @@ typedef struct asc_dvc_var {
uchar min_sdtr_index;
uchar max_sdtr_index;
struct asc_board *drv_ptr;
int ptr_map_count;
void **ptr_map;
ASC_DCNT uc_break;
} ASC_DVC_VAR;
@ -2747,6 +2738,59 @@ static void asc_prt_adv_scsi_req_q(ADV_SCSI_REQ_Q *q)
}
#endif /* ADVANSYS_DEBUG */
/*
* The advansys chip/microcode contains a 32-bit identifier for each command
* known as the 'srb'. I don't know what it stands for. The driver used
* to encode the scsi_cmnd pointer by calling virt_to_bus and retrieve it
* with bus_to_virt. Now the driver keeps a per-host map of integers to
* pointers. It auto-expands when full, unless it can't allocate memory.
* Note that an srb of 0 is treated specially by the chip/firmware, hence
* the return of i+1 in this routine, and the corresponding subtraction in
* the inverse routine.
*/
#define BAD_SRB 0
static u32 advansys_ptr_to_srb(struct asc_dvc_var *asc_dvc, void *ptr)
{
int i;
void **new_ptr;
for (i = 0; i < asc_dvc->ptr_map_count; i++) {
if (!asc_dvc->ptr_map[i])
goto out;
}
if (asc_dvc->ptr_map_count == 0)
asc_dvc->ptr_map_count = 1;
else
asc_dvc->ptr_map_count *= 2;
new_ptr = krealloc(asc_dvc->ptr_map,
asc_dvc->ptr_map_count * sizeof(void *), GFP_ATOMIC);
if (!new_ptr)
return BAD_SRB;
asc_dvc->ptr_map = new_ptr;
out:
ASC_DBG(3, "Putting ptr %p into array offset %d\n", ptr, i);
asc_dvc->ptr_map[i] = ptr;
return i + 1;
}
static void * advansys_srb_to_ptr(struct asc_dvc_var *asc_dvc, u32 srb)
{
void *ptr;
srb--;
if (srb >= asc_dvc->ptr_map_count) {
printk("advansys: bad SRB %u, max %u\n", srb,
asc_dvc->ptr_map_count);
return NULL;
}
ptr = asc_dvc->ptr_map[srb];
asc_dvc->ptr_map[srb] = NULL;
ASC_DBG(3, "Returning ptr %p from array offset %d\n", ptr, srb);
return ptr;
}
/*
* advansys_info()
*
@ -9075,17 +9119,10 @@ static void asc_isr_callback(ASC_DVC_VAR *asc_dvc_varp, ASC_QDONE_INFO *qdonep)
ASC_DBG(1, "asc_dvc_varp 0x%p, qdonep 0x%p\n", asc_dvc_varp, qdonep);
ASC_DBG_PRT_ASC_QDONE_INFO(2, qdonep);
/*
* Get the struct scsi_cmnd structure and Scsi_Host structure for the
* command that has been completed.
*/
scp = (struct scsi_cmnd *)ASC_U32_TO_VADDR(qdonep->d2.srb_ptr);
ASC_DBG(1, "scp 0x%p\n", scp);
if (scp == NULL) {
ASC_PRINT("asc_isr_callback: scp is NULL\n");
scp = advansys_srb_to_ptr(asc_dvc_varp, qdonep->d2.srb_ptr);
if (!scp)
return;
}
ASC_DBG_PRT_CDB(2, scp->cmnd, scp->cmd_len);
shost = scp->device->host;
@ -9095,6 +9132,8 @@ static void asc_isr_callback(ASC_DVC_VAR *asc_dvc_varp, ASC_QDONE_INFO *qdonep)
boardp = shost_priv(shost);
BUG_ON(asc_dvc_varp != &boardp->dvc_var.asc_dvc_var);
dma_unmap_single(boardp->dev, scp->SCp.dma_handle,
sizeof(scp->sense_buffer), DMA_FROM_DEVICE);
/*
* 'qdonep' contains the command's ending status.
*/
@ -9835,9 +9874,20 @@ static int advansys_slave_configure(struct scsi_device *sdev)
return 0;
}
static __le32 advansys_get_sense_buffer_dma(struct scsi_cmnd *scp)
{
struct asc_board *board = shost_priv(scp->device->host);
scp->SCp.dma_handle = dma_map_single(board->dev, scp->sense_buffer,
sizeof(scp->sense_buffer), DMA_FROM_DEVICE);
dma_cache_sync(board->dev, scp->sense_buffer,
sizeof(scp->sense_buffer), DMA_FROM_DEVICE);
return cpu_to_le32(scp->SCp.dma_handle);
}
static int asc_build_req(struct asc_board *boardp, struct scsi_cmnd *scp,
struct asc_scsi_q *asc_scsi_q)
{
struct asc_dvc_var *asc_dvc = &boardp->dvc_var.asc_dvc_var;
int use_sg;
memset(asc_scsi_q, 0, sizeof(*asc_scsi_q));
@ -9845,7 +9895,11 @@ static int asc_build_req(struct asc_board *boardp, struct scsi_cmnd *scp,
/*
* Point the ASC_SCSI_Q to the 'struct scsi_cmnd'.
*/
asc_scsi_q->q2.srb_ptr = ASC_VADDR_TO_U32(scp);
asc_scsi_q->q2.srb_ptr = advansys_ptr_to_srb(asc_dvc, scp);
if (asc_scsi_q->q2.srb_ptr == BAD_SRB) {
scp->result = HOST_BYTE(DID_SOFT_ERROR);
return ASC_ERROR;
}
/*
* Build the ASC_SCSI_Q request.
@ -9856,8 +9910,7 @@ static int asc_build_req(struct asc_board *boardp, struct scsi_cmnd *scp,
asc_scsi_q->q1.target_lun = scp->device->lun;
asc_scsi_q->q2.target_ix =
ASC_TIDLUN_TO_IX(scp->device->id, scp->device->lun);
asc_scsi_q->q1.sense_addr =
cpu_to_le32(virt_to_bus(&scp->sense_buffer[0]));
asc_scsi_q->q1.sense_addr = advansys_get_sense_buffer_dma(scp);
asc_scsi_q->q1.sense_len = sizeof(scp->sense_buffer);
/*
@ -9871,7 +9924,7 @@ static int asc_build_req(struct asc_board *boardp, struct scsi_cmnd *scp,
* started request.
*
*/
if ((boardp->dvc_var.asc_dvc_var.cur_dvc_qng[scp->device->id] > 0) &&
if ((asc_dvc->cur_dvc_qng[scp->device->id] > 0) &&
(boardp->reqcnt[scp->device->id] % 255) == 0) {
asc_scsi_q->q2.tag_code = MSG_ORDERED_TAG;
} else {
@ -10091,7 +10144,7 @@ adv_build_req(struct asc_board *boardp, struct scsi_cmnd *scp,
/*
* Set the ADV_SCSI_REQ_Q 'srb_ptr' to point to the adv_req_t structure.
*/
scsiqp->srb_ptr = ASC_VADDR_TO_U32(reqp);
scsiqp->srb_ptr = ADV_VADDR_TO_U32(reqp);
/*
* Set the adv_req_t 'cmndp' to point to the struct scsi_cmnd structure.