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author | Christoph Hellwig <hch@lst.de> | 2018-10-13 09:26:27 +0200 |
---|---|---|
committer | Martin K. Petersen <martin.petersen@oracle.com> | 2018-10-15 23:00:38 -0400 |
commit | 3f9295b65ea44194252d60376036a3618d822152 (patch) | |
tree | c08aa217d9c95b10fec4d1b788360cfcfc360afb /drivers/scsi/esp_scsi.c | |
parent | 44b1b4d24b2d65134efeccb3cc2341c61227f0f9 (diff) | |
download | linux-3f9295b65ea44194252d60376036a3618d822152.tar.gz linux-3f9295b65ea44194252d60376036a3618d822152.tar.bz2 linux-3f9295b65ea44194252d60376036a3618d822152.zip |
scsi: esp_scsi: move dma mapping into the core code
Except for the mac_esp driver, which uses PIO or pseudo DMA, all drivers
share the same dma mapping calls. Move the dma mapping into the core
code using the scsi_dma_map / scsi_dma_unmap helpers, with a special
identify mapping variant triggered off a new ESP_FLAG_NO_DMA_MAP flag
for mac_esp.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Tested-by: Finn Thain <fthain@telegraphics.com.au>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Diffstat (limited to 'drivers/scsi/esp_scsi.c')
-rw-r--r-- | drivers/scsi/esp_scsi.c | 77 |
1 files changed, 44 insertions, 33 deletions
diff --git a/drivers/scsi/esp_scsi.c b/drivers/scsi/esp_scsi.c index 90604bff8dd2..c88d0cbe5d1f 100644 --- a/drivers/scsi/esp_scsi.c +++ b/drivers/scsi/esp_scsi.c @@ -369,19 +369,28 @@ static void esp_map_dma(struct esp *esp, struct scsi_cmnd *cmd) { struct esp_cmd_priv *spriv = ESP_CMD_PRIV(cmd); struct scatterlist *sg = scsi_sglist(cmd); - int dir = cmd->sc_data_direction; - int total, i; + int total = 0, i; - if (dir == DMA_NONE) + if (cmd->sc_data_direction == DMA_NONE) return; - spriv->u.num_sg = esp->ops->map_sg(esp, sg, scsi_sg_count(cmd), dir); + if (esp->flags & ESP_FLAG_NO_DMA_MAP) { + /* + * For pseudo DMA and PIO we need the virtual address instead of + * a dma address, so perform an identity mapping. + */ + spriv->u.num_sg = scsi_sg_count(cmd); + for (i = 0; i < spriv->u.num_sg; i++) { + sg[i].dma_address = (uintptr_t)sg_virt(&sg[i]); + total += sg_dma_len(&sg[i]); + } + } else { + spriv->u.num_sg = scsi_dma_map(cmd); + for (i = 0; i < spriv->u.num_sg; i++) + total += sg_dma_len(&sg[i]); + } spriv->cur_residue = sg_dma_len(sg); spriv->cur_sg = sg; - - total = 0; - for (i = 0; i < spriv->u.num_sg; i++) - total += sg_dma_len(&sg[i]); spriv->tot_residue = total; } @@ -441,13 +450,8 @@ static void esp_advance_dma(struct esp *esp, struct esp_cmd_entry *ent, static void esp_unmap_dma(struct esp *esp, struct scsi_cmnd *cmd) { - struct esp_cmd_priv *spriv = ESP_CMD_PRIV(cmd); - int dir = cmd->sc_data_direction; - - if (dir == DMA_NONE) - return; - - esp->ops->unmap_sg(esp, scsi_sglist(cmd), spriv->u.num_sg, dir); + if (!(esp->flags & ESP_FLAG_NO_DMA_MAP)) + scsi_dma_unmap(cmd); } static void esp_save_pointers(struct esp *esp, struct esp_cmd_entry *ent) @@ -624,6 +628,26 @@ static void esp_free_lun_tag(struct esp_cmd_entry *ent, } } +static void esp_map_sense(struct esp *esp, struct esp_cmd_entry *ent) +{ + ent->sense_ptr = ent->cmd->sense_buffer; + if (esp->flags & ESP_FLAG_NO_DMA_MAP) { + ent->sense_dma = (uintptr_t)ent->sense_ptr; + return; + } + + ent->sense_dma = dma_map_single(esp->dev, ent->sense_ptr, + SCSI_SENSE_BUFFERSIZE, DMA_FROM_DEVICE); +} + +static void esp_unmap_sense(struct esp *esp, struct esp_cmd_entry *ent) +{ + if (!(esp->flags & ESP_FLAG_NO_DMA_MAP)) + dma_unmap_single(esp->dev, ent->sense_dma, + SCSI_SENSE_BUFFERSIZE, DMA_FROM_DEVICE); + ent->sense_ptr = NULL; +} + /* When a contingent allegiance conditon is created, we force feed a * REQUEST_SENSE command to the device to fetch the sense data. I * tried many other schemes, relying on the scsi error handling layer @@ -645,12 +669,7 @@ static void esp_autosense(struct esp *esp, struct esp_cmd_entry *ent) if (!ent->sense_ptr) { esp_log_autosense("Doing auto-sense for tgt[%d] lun[%d]\n", tgt, lun); - - ent->sense_ptr = cmd->sense_buffer; - ent->sense_dma = esp->ops->map_single(esp, - ent->sense_ptr, - SCSI_SENSE_BUFFERSIZE, - DMA_FROM_DEVICE); + esp_map_sense(esp, ent); } ent->saved_sense_ptr = ent->sense_ptr; @@ -902,9 +921,7 @@ static void esp_cmd_is_done(struct esp *esp, struct esp_cmd_entry *ent, } if (ent->flags & ESP_CMD_FLAG_AUTOSENSE) { - esp->ops->unmap_single(esp, ent->sense_dma, - SCSI_SENSE_BUFFERSIZE, DMA_FROM_DEVICE); - ent->sense_ptr = NULL; + esp_unmap_sense(esp, ent); /* Restore the message/status bytes to what we actually * saw originally. Also, report that we are providing @@ -1256,10 +1273,7 @@ static int esp_finish_select(struct esp *esp) esp->cmd_bytes_ptr = NULL; esp->cmd_bytes_left = 0; } else { - esp->ops->unmap_single(esp, ent->sense_dma, - SCSI_SENSE_BUFFERSIZE, - DMA_FROM_DEVICE); - ent->sense_ptr = NULL; + esp_unmap_sense(esp, ent); } /* Now that the state is unwound properly, put back onto @@ -2039,11 +2053,8 @@ static void esp_reset_cleanup_one(struct esp *esp, struct esp_cmd_entry *ent) esp_free_lun_tag(ent, cmd->device->hostdata); cmd->result = DID_RESET << 16; - if (ent->flags & ESP_CMD_FLAG_AUTOSENSE) { - esp->ops->unmap_single(esp, ent->sense_dma, - SCSI_SENSE_BUFFERSIZE, DMA_FROM_DEVICE); - ent->sense_ptr = NULL; - } + if (ent->flags & ESP_CMD_FLAG_AUTOSENSE) + esp_unmap_sense(esp, ent); cmd->scsi_done(cmd); list_del(&ent->list); |