Convert to use a shared host tag map for command lookup. This
saves us having an internal structure and avoid the command
pointer abuse.
Signed-off-by: Hannes Reinecke <hare@xxxxxxx>
---
drivers/scsi/advansys.c | 225 +++++++++++++++++-------------------------------
1 file changed, 79 insertions(+), 146 deletions(-)
diff --git a/drivers/scsi/advansys.c b/drivers/scsi/advansys.c
index e936f48..b595e8b 100644
--- a/drivers/scsi/advansys.c
+++ b/drivers/scsi/advansys.c
@@ -315,7 +315,7 @@ typedef struct asc_scsiq_1 {
} ASC_SCSIQ_1;
typedef struct asc_scsiq_2 {
- ASC_VADDR srb_ptr;
+ u32 srb_tag;
uchar target_ix;
uchar flag;
uchar cdb_len;
@@ -592,8 +592,6 @@ 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;
@@ -1866,7 +1864,7 @@ typedef struct adv_scsi_req_q {
* End of microcode structure - 60 bytes. The rest of the structure
* is used by the Adv Library and ignored by the microcode.
*/
- ADV_VADDR srb_ptr;
+ u32 srb_tag;
ADV_SG_BLOCK *sg_list_ptr; /* SG list virtual address. */
char *vdata_addr; /* Data buffer virtual address. */
uchar a_flag;
@@ -1877,9 +1875,9 @@ typedef struct adv_scsi_req_q {
* The following two structures are used to process Wide Board requests.
*
* The ADV_SCSI_REQ_Q structure in adv_req_t is passed to the Adv Library
- * and microcode with the ADV_SCSI_REQ_Q field 'srb_ptr' pointing to the
- * adv_req_t. The adv_req_t structure 'cmndp' field in turn points to the
- * Mid-Level SCSI request structure.
+ * and microcode with the ADV_SCSI_REQ_Q field 'srb_tag' set to the
+ * SCSI request tag. The adv_req_t structure 'cmndp' field in turn points
+ * to the Mid-Level SCSI request structure.
*
* Zero or more ADV_SG_BLOCK are used with each ADV_SCSI_REQ_Q. Each
* ADV_SG_BLOCK structure holds 15 scatter-gather elements. Under Linux
@@ -1942,7 +1940,6 @@ typedef struct adv_dvc_var {
ADV_CARR_T *icq_sp; /* Initiator command queue stopper pointer. */
ADV_CARR_T *irq_sp; /* Initiator response queue stopper pointer. */
ushort carr_pending_cnt; /* Count of pending carriers. */
- struct adv_req *orig_reqp; /* adv_req_t memory block. */
/*
* Note: The following fields will not be used after initialization. The
* driver may discard the buffer after initialization is done.
@@ -2068,8 +2065,8 @@ do { \
AdvReadByteRegister((iop_base), IOPB_CHIP_TYPE_REV)
/*
- * Abort an SRB in the chip's RISC Memory. The 'srb_ptr' argument must
- * match the ASC_SCSI_REQ_Q 'srb_ptr' field.
+ * Abort an SRB in the chip's RISC Memory. The 'srb_tag' argument must
+ * match the ASC_SCSI_REQ_Q 'srb_tag' field.
*
* If the request has not yet been sent to the device it will simply be
* aborted from RISC memory. If the request is disconnected it will be
@@ -2079,9 +2076,9 @@ do { \
* ADV_TRUE(1) - Queue was successfully aborted.
* ADV_FALSE(0) - Queue was not found on the active queue list.
*/
-#define AdvAbortQueue(asc_dvc, scsiq) \
- AdvSendIdleCmd((asc_dvc), (ushort) IDLE_CMD_ABORT, \
- (ADV_DCNT) (scsiq))
+#define AdvAbortQueue(asc_dvc, srb_tag) \
+ AdvSendIdleCmd((asc_dvc), (ushort) IDLE_CMD_ABORT, \
+ (ADV_DCNT) (srb_tag))
/*
* Send a Bus Device Reset Message to the specified target ID.
@@ -2095,8 +2092,8 @@ do { \
* are not purged.
*/
#define AdvResetDevice(asc_dvc, target_id) \
- AdvSendIdleCmd((asc_dvc), (ushort) IDLE_CMD_DEVICE_RESET, \
- (ADV_DCNT) (target_id))
+ AdvSendIdleCmd((asc_dvc), (ushort) IDLE_CMD_DEVICE_RESET, \
+ (ADV_DCNT) (target_id))
/*
* SCSI Wide Type definition.
@@ -2345,6 +2342,7 @@ struct asc_stats {
*/
struct asc_board {
struct device *dev;
+ struct Scsi_Host *shost;
uint flags; /* Board flags */
unsigned int irq;
union {
@@ -2599,8 +2597,8 @@ static void asc_prt_asc_scsi_q(ASC_SCSI_Q *q)
printk("ASC_SCSI_Q at addr 0x%lx\n", (ulong)q);
printk
- (" target_ix 0x%x, target_lun %u, srb_ptr 0x%lx, tag_code 0x%x,\n",
- q->q2.target_ix, q->q1.target_lun, (ulong)q->q2.srb_ptr,
+ (" target_ix 0x%x, target_lun %u, srb_tag 0x%x, tag_code 0x%x,\n",
+ q->q2.target_ix, q->q1.target_lun, q->q2.srb_tag,
q->q2.tag_code);
printk
@@ -2633,8 +2631,8 @@ static void asc_prt_asc_scsi_q(ASC_SCSI_Q *q)
static void asc_prt_asc_qdone_info(ASC_QDONE_INFO *q)
{
printk("ASC_QDONE_INFO at addr 0x%lx\n", (ulong)q);
- printk(" srb_ptr 0x%lx, target_ix %u, cdb_len %u, tag_code %u,\n",
- (ulong)q->d2.srb_ptr, q->d2.target_ix, q->d2.cdb_len,
+ printk(" srb_tag 0x%x, target_ix %u, cdb_len %u, tag_code %u,\n",
+ q->d2.srb_tag, q->d2.target_ix, q->d2.cdb_len,
q->d2.tag_code);
printk
(" done_stat 0x%x, host_stat 0x%x, scsi_stat 0x%x, scsi_msg 0x%x\n",
@@ -2676,8 +2674,8 @@ static void asc_prt_adv_scsi_req_q(ADV_SCSI_REQ_Q *q)
printk("ADV_SCSI_REQ_Q at addr 0x%lx\n", (ulong)q);
- printk(" target_id %u, target_lun %u, srb_ptr 0x%lx, a_flag 0x%x\n",
- q->target_id, q->target_lun, (ulong)q->srb_ptr, q->a_flag);
+ printk(" target_id %u, target_lun %u, srb_tag 0x%x, a_flag 0x%x\n",
+ q->target_id, q->target_lun, q->srb_tag, q->a_flag);
printk(" cntl 0x%x, data_addr 0x%lx, vdata_addr 0x%lx\n",
q->cntl, (ulong)le32_to_cpu(q->data_addr), (ulong)q->vdata_addr);
@@ -2721,59 +2719,6 @@ 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()
*
* Return suitable for printing on the console with the argument
@@ -6133,15 +6078,15 @@ static void adv_async_callback(ADV_DVC_VAR *adv_dvc_varp, uchar code)
*/
static void adv_isr_callback(ADV_DVC_VAR *adv_dvc_varp, ADV_SCSI_REQ_Q *scsiqp)
{
- struct asc_board *boardp;
+ struct asc_board *boardp = adv_dvc_varp->drv_ptr;
+ u32 srb_tag;
adv_req_t *reqp;
adv_sgblk_t *sgblkp;
struct scsi_cmnd *scp;
- struct Scsi_Host *shost;
ADV_DCNT resid_cnt;
- ASC_DBG(1, "adv_dvc_varp 0x%lx, scsiqp 0x%lx\n",
- (ulong)adv_dvc_varp, (ulong)scsiqp);
+ ASC_DBG(1, "adv_dvc_varp 0x%p, scsiqp 0x%p\n",
+ adv_dvc_varp, scsiqp);
ASC_DBG_PRT_ADV_SCSI_REQ_Q(2, scsiqp);
/*
@@ -6149,22 +6094,9 @@ static void adv_isr_callback(ADV_DVC_VAR *adv_dvc_varp, ADV_SCSI_REQ_Q *scsiqp)
* completed. The adv_req_t structure actually contains the
* completed ADV_SCSI_REQ_Q structure.
*/
- reqp = (adv_req_t *)ADV_U32_TO_VADDR(scsiqp->srb_ptr);
- ASC_DBG(1, "reqp 0x%lx\n", (ulong)reqp);
- if (reqp == NULL) {
- ASC_PRINT("adv_isr_callback: reqp is NULL\n");
- return;
- }
+ srb_tag = le32_to_cpu(scsiqp->srb_tag);
+ scp = scsi_host_find_tag(boardp->shost, scsiqp->srb_tag);
- /*
- * Get the struct scsi_cmnd structure and Scsi_Host structure for the
- * command that has been completed.
- *
- * Note: The adv_req_t request structure and adv_sgblk_t structure,
- * if any, are dropped, because a board structure pointer can not be
- * determined.
- */
- scp = reqp->cmndp;
ASC_DBG(1, "scp 0x%p\n", scp);
if (scp == NULL) {
ASC_PRINT
@@ -6173,12 +6105,21 @@ static void adv_isr_callback(ADV_DVC_VAR *adv_dvc_varp, ADV_SCSI_REQ_Q *scsiqp)
}
ASC_DBG_PRT_CDB(2, scp->cmnd, scp->cmd_len);
- shost = scp->device->host;
- ASC_STATS(shost, callback);
- ASC_DBG(1, "shost 0x%p\n", shost);
+ reqp = (adv_req_t *)scp->host_scribble;
+ ASC_DBG(1, "reqp 0x%lx\n", (ulong)reqp);
+ if (reqp == NULL) {
+ ASC_PRINT("adv_isr_callback: reqp is NULL\n");
+ return;
+ }
+ /*
+ * Remove backreferences to avoid duplicate
+ * command completions.
+ */
+ scp->host_scribble = NULL;
+ reqp->cmndp = NULL;
- boardp = shost_priv(shost);
- BUG_ON(adv_dvc_varp != &boardp->dvc_var.adv_dvc_var);
+ ASC_STATS(boardp->shost, callback);
+ ASC_DBG(1, "shost 0x%p\n", boardp->shost);
/*
* 'done_status' contains the command's ending status.
@@ -6276,13 +6217,6 @@ static void adv_isr_callback(ADV_DVC_VAR *adv_dvc_varp, ADV_SCSI_REQ_Q *scsiqp)
boardp->adv_sgblkp = sgblkp;
}
- /*
- * Free the adv_req_t structure used with the command by adding
- * it back to the board free list.
- */
- reqp->next_reqp = boardp->adv_reqp;
- boardp->adv_reqp = reqp;
-
ASC_DBG(1, "done\n");
}
@@ -7092,25 +7026,24 @@ _AscCopyLramScsiDoneQ(PortAddr iop_base,
*/
static void asc_isr_callback(ASC_DVC_VAR *asc_dvc_varp, ASC_QDONE_INFO *qdonep)
{
- struct asc_board *boardp;
+ struct asc_board *boardp = asc_dvc_varp->drv_ptr;
+ u32 srb_tag;
struct scsi_cmnd *scp;
- struct Scsi_Host *shost;
ASC_DBG(1, "asc_dvc_varp 0x%p, qdonep 0x%p\n", asc_dvc_varp, qdonep);
ASC_DBG_PRT_ASC_QDONE_INFO(2, qdonep);
- scp = advansys_srb_to_ptr(asc_dvc_varp, qdonep->d2.srb_ptr);
+ /*
+ * Decrease the srb_tag by 1 to find the SCSI command
+ */
+ srb_tag = qdonep->d2.srb_tag - 1;
+ scp = scsi_host_find_tag(boardp->shost, srb_tag);
if (!scp)
return;
ASC_DBG_PRT_CDB(2, scp->cmnd, scp->cmd_len);
- shost = scp->device->host;
- ASC_STATS(shost, callback);
- ASC_DBG(1, "shost 0x%p\n", shost);
-
- boardp = shost_priv(shost);
- BUG_ON(asc_dvc_varp != &boardp->dvc_var.asc_dvc_var);
+ ASC_STATS(boardp->shost, callback);
dma_unmap_single(boardp->dev, scp->SCp.dma_handle,
SCSI_SENSE_BUFFERSIZE, DMA_FROM_DEVICE);
@@ -7293,7 +7226,7 @@ static int AscIsrQDone(ASC_DVC_VAR *asc_dvc)
scsiq->d3.done_stat = QD_WITH_ERROR;
goto FATAL_ERR_QDONE;
}
- if ((scsiq->d2.srb_ptr == 0UL) ||
+ if ((scsiq->d2.srb_tag == 0UL) ||
((scsiq->q_status & QS_ABORTED) != 0)) {
return (0x11);
} else if (scsiq->q_status == QS_DONE) {
@@ -7861,17 +7794,16 @@ static int asc_build_req(struct asc_board *boardp, struct scsi_cmnd *scp,
{
struct asc_dvc_var *asc_dvc = &boardp->dvc_var.asc_dvc_var;
int use_sg;
+ u32 srb_tag;
memset(asc_scsi_q, 0, sizeof(*asc_scsi_q));
/*
- * Point the ASC_SCSI_Q to the 'struct scsi_cmnd'.
+ * Set the srb_tag to the command tag + 1, as
+ * srb_tag '0' is used internally by the chip.
*/
- 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;
- }
+ srb_tag = scp->request->tag + 1;
+ asc_scsi_q->q2.srb_tag = srb_tag;
/*
* Build the ASC_SCSI_Q request.
@@ -8083,6 +8015,7 @@ static int
adv_build_req(struct asc_board *boardp, struct scsi_cmnd *scp,
ADV_SCSI_REQ_Q **adv_scsiqpp)
{
+ u32 srb_tag = scp->request->tag;
adv_req_t *reqp;
ADV_SCSI_REQ_Q *scsiqp;
int i;
@@ -8093,14 +8026,11 @@ adv_build_req(struct asc_board *boardp, struct scsi_cmnd *scp,
* Allocate an adv_req_t structure from the board to execute
* the command.
*/
- if (boardp->adv_reqp == NULL) {
+ reqp = &boardp->adv_reqp[srb_tag];
+ if (reqp->cmndp && reqp->cmndp != scp ) {
ASC_DBG(1, "no free adv_req_t\n");
ASC_STATS(scp->device->host, adv_build_noreq);
return ASC_BUSY;
- } else {
- reqp = boardp->adv_reqp;
- boardp->adv_reqp = reqp->next_reqp;
- reqp->next_reqp = NULL;
}
/*
@@ -8114,14 +8044,15 @@ adv_build_req(struct asc_board *boardp, struct scsi_cmnd *scp,
scsiqp->cntl = scsiqp->scsi_cntl = scsiqp->done_status = 0;
/*
- * Set the ADV_SCSI_REQ_Q 'srb_ptr' to point to the adv_req_t structure.
+ * Set the srb_tag to the command tag.
*/
- scsiqp->srb_ptr = ADV_VADDR_TO_U32(reqp);
+ scsiqp->srb_tag = srb_tag;
/*
* Set the adv_req_t 'cmndp' to point to the struct scsi_cmnd structure.
*/
reqp->cmndp = scp;
+ scp->host_scribble = (void *)reqp;
/*
* Build the ADV_SCSI_REQ_Q request.
@@ -8163,13 +8094,8 @@ adv_build_req(struct asc_board *boardp, struct scsi_cmnd *scp,
scp->device->host->sg_tablesize);
scsi_dma_unmap(scp);
scp->result = HOST_BYTE(DID_ERROR);
-
- /*
- * Free the 'adv_req_t' structure by adding it back
- * to the board free list.
- */
- reqp->next_reqp = boardp->adv_reqp;
- boardp->adv_reqp = reqp;
+ reqp->cmndp = NULL;
+ scp->host_scribble = NULL;
return ASC_ERROR;
}
@@ -8178,12 +8104,10 @@ adv_build_req(struct asc_board *boardp, struct scsi_cmnd *scp,
ret = adv_get_sglist(boardp, reqp, scp, use_sg);
if (ret != ADV_SUCCESS) {
- /*
- * Free the adv_req_t structure by adding it back to
- * the board free list.
- */
- reqp->next_reqp = boardp->adv_reqp;
- boardp->adv_reqp = reqp;
+ scsi_dma_unmap(scp);
+ scp->result = HOST_BYTE(DID_ERROR);
+ reqp->cmndp = NULL;
+ scp->host_scribble = NULL;
return ret;
}
@@ -11244,6 +11168,7 @@ static struct scsi_host_template advansys_template = {
* by enabling clustering, I/O throughput increases as well.
*/
.use_clustering = ENABLE_CLUSTERING,
+ .use_blk_tags = 1,
};
static int advansys_wide_init_chip(struct Scsi_Host *shost)
@@ -11272,7 +11197,7 @@ static int advansys_wide_init_chip(struct Scsi_Host *shost)
* If the allocation fails decrement and try again.
*/
for (req_cnt = adv_dvc->max_host_qng; req_cnt > 0; req_cnt--) {
- reqp = kmalloc(sizeof(adv_req_t) * req_cnt, GFP_KERNEL);
+ reqp = kzalloc(sizeof(adv_req_t) * req_cnt, GFP_KERNEL);
ASC_DBG(1, "reqp 0x%p, req_cnt %d, bytes %lu\n", reqp, req_cnt,
(ulong)sizeof(adv_req_t) * req_cnt);
@@ -11284,7 +11209,7 @@ static int advansys_wide_init_chip(struct Scsi_Host *shost)
if (!reqp)
goto kmalloc_failed;
- adv_dvc->orig_reqp = reqp;
+ board->adv_reqp = reqp;
/*
* Allocate up to ADV_TOT_SG_BLOCK request structures for
@@ -11317,7 +11242,6 @@ static int advansys_wide_init_chip(struct Scsi_Host *shost)
for (; req_cnt > 0; req_cnt--) {
reqp[req_cnt - 1].next_reqp = &reqp[req_cnt];
}
- board->adv_reqp = &reqp[0];
if (adv_dvc->chip_type == ADV_CHIP_ASC3550) {
ASC_DBG(2, "AdvInitAsc3550Driver()\n");
@@ -11350,8 +11274,8 @@ static void advansys_wide_free_mem(struct asc_board *board)
struct adv_dvc_var *adv_dvc = &board->dvc_var.adv_dvc_var;
kfree(adv_dvc->carrier_buf);
adv_dvc->carrier_buf = NULL;
- kfree(adv_dvc->orig_reqp);
- adv_dvc->orig_reqp = board->adv_reqp = NULL;
+ kfree(board->adv_reqp);
+ board->adv_reqp = NULL;
while (board->adv_sgblkp) {
adv_sgblk_t *sgp = board->adv_sgblkp;
board->adv_sgblkp = sgp->next_sgblkp;
@@ -11651,6 +11575,11 @@ static int advansys_board_found(struct Scsi_Host *shost, unsigned int iop,
/* Set maximum number of queues the adapter can handle. */
shost->can_queue = adv_dvc_varp->max_host_qng;
}
+ ret = scsi_init_shared_tag_map(shost, shost->can_queue);
+ if (ret) {
+ shost_printk(KERN_ERR, shost, "init tag map failed\n");
+ goto err_free_dma;
+ }
/*
* Following v1.3.89, 'cmd_per_lun' is no longer needed
@@ -11922,6 +11851,7 @@ static int advansys_isa_probe(struct device *dev, unsigned int id)
board = shost_priv(shost);
board->irq = advansys_isa_irq_no(iop_base);
board->dev = dev;
+ board->shost = shost;
err = advansys_board_found(shost, iop_base, ASC_IS_ISA);
if (err)
@@ -12004,6 +11934,7 @@ static int advansys_vlb_probe(struct device *dev, unsigned int id)
board = shost_priv(shost);
board->irq = advansys_vlb_irq_no(iop_base);
board->dev = dev;
+ board->shost = shost;
err = advansys_board_found(shost, iop_base, ASC_IS_VL);
if (err)
@@ -12111,6 +12042,7 @@ static int advansys_eisa_probe(struct device *dev)
board = shost_priv(shost);
board->irq = irq;
board->dev = dev;
+ board->shost = shost;
err = advansys_board_found(shost, ioport, ASC_IS_EISA);
if (!err) {
@@ -12227,6 +12159,7 @@ static int advansys_pci_probe(struct pci_dev *pdev,
board = shost_priv(shost);
board->irq = pdev->irq;
board->dev = &pdev->dev;
+ board->shost = shost;
if (pdev->device == PCI_DEVICE_ID_ASP_ABP940UW ||
pdev->device == PCI_DEVICE_ID_38C0800_REV1 ||
--
1.8.5.2
--
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