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path: root/drivers/firewire/fw-sbp2.c
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Diffstat (limited to 'drivers/firewire/fw-sbp2.c')
-rw-r--r--drivers/firewire/fw-sbp2.c116
1 files changed, 44 insertions, 72 deletions
diff --git a/drivers/firewire/fw-sbp2.c b/drivers/firewire/fw-sbp2.c
index aaff50ebba1d..ef0b9b419c27 100644
--- a/drivers/firewire/fw-sbp2.c
+++ b/drivers/firewire/fw-sbp2.c
@@ -29,6 +29,7 @@
*/
#include <linux/blkdev.h>
+#include <linux/bug.h>
#include <linux/delay.h>
#include <linux/device.h>
#include <linux/dma-mapping.h>
@@ -181,10 +182,16 @@ struct sbp2_target {
#define SBP2_MAX_LOGIN_ORB_TIMEOUT 40000U /* Timeout in ms */
#define SBP2_ORB_TIMEOUT 2000U /* Timeout in ms */
#define SBP2_ORB_NULL 0x80000000
-#define SBP2_MAX_SG_ELEMENT_LENGTH 0xf000
#define SBP2_RETRY_LIMIT 0xf /* 15 retries */
#define SBP2_CYCLE_LIMIT (0xc8 << 12) /* 200 125us cycles */
+/*
+ * The default maximum s/g segment size of a FireWire controller is
+ * usually 0x10000, but SBP-2 only allows 0xffff. Since buffers have to
+ * be quadlet-aligned, we set the length limit to 0xffff & ~3.
+ */
+#define SBP2_MAX_SEG_SIZE 0xfffc
+
/* Unit directory keys */
#define SBP2_CSR_UNIT_CHARACTERISTICS 0x3a
#define SBP2_CSR_FIRMWARE_REVISION 0x3c
@@ -621,25 +628,15 @@ sbp2_send_management_orb(struct sbp2_logical_unit *lu, int node_id,
return retval;
}
-static void
-complete_agent_reset_write(struct fw_card *card, int rcode,
- void *payload, size_t length, void *done)
-{
- complete(done);
-}
-
static void sbp2_agent_reset(struct sbp2_logical_unit *lu)
{
struct fw_device *device = fw_device(lu->tgt->unit->device.parent);
- DECLARE_COMPLETION_ONSTACK(done);
- struct fw_transaction t;
- static u32 z;
+ __be32 d = 0;
- fw_send_request(device->card, &t, TCODE_WRITE_QUADLET_REQUEST,
- lu->tgt->node_id, lu->generation, device->max_speed,
- lu->command_block_agent_address + SBP2_AGENT_RESET,
- &z, sizeof(z), complete_agent_reset_write, &done);
- wait_for_completion(&done);
+ fw_run_transaction(device->card, TCODE_WRITE_QUADLET_REQUEST,
+ lu->tgt->node_id, lu->generation, device->max_speed,
+ lu->command_block_agent_address + SBP2_AGENT_RESET,
+ &d, sizeof(d));
}
static void
@@ -653,7 +650,7 @@ static void sbp2_agent_reset_no_wait(struct sbp2_logical_unit *lu)
{
struct fw_device *device = fw_device(lu->tgt->unit->device.parent);
struct fw_transaction *t;
- static u32 z;
+ static __be32 d;
t = kmalloc(sizeof(*t), GFP_ATOMIC);
if (t == NULL)
@@ -662,7 +659,7 @@ static void sbp2_agent_reset_no_wait(struct sbp2_logical_unit *lu)
fw_send_request(device->card, t, TCODE_WRITE_QUADLET_REQUEST,
lu->tgt->node_id, lu->generation, device->max_speed,
lu->command_block_agent_address + SBP2_AGENT_RESET,
- &z, sizeof(z), complete_agent_reset_write_no_wait, t);
+ &d, sizeof(d), complete_agent_reset_write_no_wait, t);
}
static void sbp2_set_generation(struct sbp2_logical_unit *lu, int generation)
@@ -823,13 +820,6 @@ static void sbp2_target_put(struct sbp2_target *tgt)
kref_put(&tgt->kref, sbp2_release_target);
}
-static void
-complete_set_busy_timeout(struct fw_card *card, int rcode,
- void *payload, size_t length, void *done)
-{
- complete(done);
-}
-
/*
* Write retransmit retry values into the BUSY_TIMEOUT register.
* - The single-phase retry protocol is supported by all SBP-2 devices, but the
@@ -849,17 +839,12 @@ complete_set_busy_timeout(struct fw_card *card, int rcode,
static void sbp2_set_busy_timeout(struct sbp2_logical_unit *lu)
{
struct fw_device *device = fw_device(lu->tgt->unit->device.parent);
- DECLARE_COMPLETION_ONSTACK(done);
- struct fw_transaction t;
- static __be32 busy_timeout;
-
- busy_timeout = cpu_to_be32(SBP2_CYCLE_LIMIT | SBP2_RETRY_LIMIT);
+ __be32 d = cpu_to_be32(SBP2_CYCLE_LIMIT | SBP2_RETRY_LIMIT);
- fw_send_request(device->card, &t, TCODE_WRITE_QUADLET_REQUEST,
- lu->tgt->node_id, lu->generation, device->max_speed,
- CSR_REGISTER_BASE + CSR_BUSY_TIMEOUT, &busy_timeout,
- sizeof(busy_timeout), complete_set_busy_timeout, &done);
- wait_for_completion(&done);
+ fw_run_transaction(device->card, TCODE_WRITE_QUADLET_REQUEST,
+ lu->tgt->node_id, lu->generation, device->max_speed,
+ CSR_REGISTER_BASE + CSR_BUSY_TIMEOUT,
+ &d, sizeof(d));
}
static void sbp2_reconnect(struct work_struct *work);
@@ -1121,6 +1106,10 @@ static int sbp2_probe(struct device *dev)
struct Scsi_Host *shost;
u32 model, firmware_revision;
+ if (dma_get_max_seg_size(device->card->device) > SBP2_MAX_SEG_SIZE)
+ BUG_ON(dma_set_max_seg_size(device->card->device,
+ SBP2_MAX_SEG_SIZE));
+
shost = scsi_host_alloc(&scsi_driver_template, sizeof(*tgt));
if (shost == NULL)
return -ENOMEM;
@@ -1369,14 +1358,12 @@ static int
sbp2_map_scatterlist(struct sbp2_command_orb *orb, struct fw_device *device,
struct sbp2_logical_unit *lu)
{
- struct scatterlist *sg;
- int sg_len, l, i, j, count;
- dma_addr_t sg_addr;
-
- sg = scsi_sglist(orb->cmd);
- count = dma_map_sg(device->card->device, sg, scsi_sg_count(orb->cmd),
- orb->cmd->sc_data_direction);
- if (count == 0)
+ struct scatterlist *sg = scsi_sglist(orb->cmd);
+ int i, n;
+
+ n = dma_map_sg(device->card->device, sg, scsi_sg_count(orb->cmd),
+ orb->cmd->sc_data_direction);
+ if (n == 0)
goto fail;
/*
@@ -1386,7 +1373,7 @@ sbp2_map_scatterlist(struct sbp2_command_orb *orb, struct fw_device *device,
* as the second generation iPod which doesn't support page
* tables.
*/
- if (count == 1 && sg_dma_len(sg) < SBP2_MAX_SG_ELEMENT_LENGTH) {
+ if (n == 1) {
orb->request.data_descriptor.high =
cpu_to_be32(lu->tgt->address_high);
orb->request.data_descriptor.low =
@@ -1396,29 +1383,9 @@ sbp2_map_scatterlist(struct sbp2_command_orb *orb, struct fw_device *device,
return 0;
}
- /*
- * Convert the scatterlist to an sbp2 page table. If any
- * scatterlist entries are too big for sbp2, we split them as we
- * go. Even if we ask the block I/O layer to not give us sg
- * elements larger than 65535 bytes, some IOMMUs may merge sg elements
- * during DMA mapping, and Linux currently doesn't prevent this.
- */
- for (i = 0, j = 0; i < count; i++, sg = sg_next(sg)) {
- sg_len = sg_dma_len(sg);
- sg_addr = sg_dma_address(sg);
- while (sg_len) {
- /* FIXME: This won't get us out of the pinch. */
- if (unlikely(j >= ARRAY_SIZE(orb->page_table))) {
- fw_error("page table overflow\n");
- goto fail_page_table;
- }
- l = min(sg_len, SBP2_MAX_SG_ELEMENT_LENGTH);
- orb->page_table[j].low = cpu_to_be32(sg_addr);
- orb->page_table[j].high = cpu_to_be32(l << 16);
- sg_addr += l;
- sg_len -= l;
- j++;
- }
+ for_each_sg(sg, sg, n, i) {
+ orb->page_table[i].high = cpu_to_be32(sg_dma_len(sg) << 16);
+ orb->page_table[i].low = cpu_to_be32(sg_dma_address(sg));
}
orb->page_table_bus =
@@ -1437,13 +1404,13 @@ sbp2_map_scatterlist(struct sbp2_command_orb *orb, struct fw_device *device,
orb->request.data_descriptor.high = cpu_to_be32(lu->tgt->address_high);
orb->request.data_descriptor.low = cpu_to_be32(orb->page_table_bus);
orb->request.misc |= cpu_to_be32(COMMAND_ORB_PAGE_TABLE_PRESENT |
- COMMAND_ORB_DATA_SIZE(j));
+ COMMAND_ORB_DATA_SIZE(n));
return 0;
fail_page_table:
- dma_unmap_sg(device->card->device, sg, scsi_sg_count(orb->cmd),
- orb->cmd->sc_data_direction);
+ dma_unmap_sg(device->card->device, scsi_sglist(orb->cmd),
+ scsi_sg_count(orb->cmd), orb->cmd->sc_data_direction);
fail:
return -ENOMEM;
}
@@ -1456,7 +1423,7 @@ static int sbp2_scsi_queuecommand(struct scsi_cmnd *cmd, scsi_done_fn_t done)
struct fw_device *device = fw_device(lu->tgt->unit->device.parent);
struct sbp2_command_orb *orb;
unsigned int max_payload;
- int retval = SCSI_MLQUEUE_HOST_BUSY;
+ int generation, retval = SCSI_MLQUEUE_HOST_BUSY;
/*
* Bidirectional commands are not yet implemented, and unknown
@@ -1500,6 +1467,9 @@ static int sbp2_scsi_queuecommand(struct scsi_cmnd *cmd, scsi_done_fn_t done)
if (cmd->sc_data_direction == DMA_FROM_DEVICE)
orb->request.misc |= cpu_to_be32(COMMAND_ORB_DIRECTION);
+ generation = device->generation;
+ smp_rmb(); /* sbp2_map_scatterlist looks at tgt->address_high */
+
if (scsi_sg_count(cmd) && sbp2_map_scatterlist(orb, device, lu) < 0)
goto out;
@@ -1512,7 +1482,7 @@ static int sbp2_scsi_queuecommand(struct scsi_cmnd *cmd, scsi_done_fn_t done)
if (dma_mapping_error(device->card->device, orb->base.request_bus))
goto out;
- sbp2_send_orb(&orb->base, lu, lu->tgt->node_id, lu->generation,
+ sbp2_send_orb(&orb->base, lu, lu->tgt->node_id, generation,
lu->command_block_agent_address + SBP2_ORB_POINTER);
retval = 0;
out:
@@ -1564,6 +1534,8 @@ static int sbp2_scsi_slave_configure(struct scsi_device *sdev)
if (lu->tgt->workarounds & SBP2_WORKAROUND_128K_MAX_TRANS)
blk_queue_max_sectors(sdev->request_queue, 128 * 1024 / 512);
+ blk_queue_max_segment_size(sdev->request_queue, SBP2_MAX_SEG_SIZE);
+
return 0;
}