Merge remote-tracking branches 'asoc/topic/max98926', 'asoc/topic/mtk', 'asoc/topic...

[cascardo/linux.git] / drivers / target / target_core_device.c

diff --git a/drivers/target/target_core_device.c b/drivers/target/target_core_device.c
index cacd97a..da457e2 100644 (file)
--- a/drivers/target/target_core_device.c
+++ b/drivers/target/target_core_device.c
@@ -828,6 +828,50 @@ struct se_device *target_alloc_device(struct se_hba *hba, const char *name)
        return dev;
 }
 
+/*
+ * Check if the underlying struct block_device request_queue supports
+ * the QUEUE_FLAG_DISCARD bit for UNMAP/WRITE_SAME in SCSI + TRIM
+ * in ATA and we need to set TPE=1
+ */
+bool target_configure_unmap_from_queue(struct se_dev_attrib *attrib,
+                                      struct request_queue *q, int block_size)
+{
+       if (!blk_queue_discard(q))
+               return false;
+
+       attrib->max_unmap_lba_count = (q->limits.max_discard_sectors << 9) /
+                                                               block_size;
+       /*
+        * Currently hardcoded to 1 in Linux/SCSI code..
+        */
+       attrib->max_unmap_block_desc_count = 1;
+       attrib->unmap_granularity = q->limits.discard_granularity / block_size;
+       attrib->unmap_granularity_alignment = q->limits.discard_alignment /
+                                                               block_size;
+       attrib->unmap_zeroes_data = q->limits.discard_zeroes_data;
+       return true;
+}
+EXPORT_SYMBOL(target_configure_unmap_from_queue);
+
+/*
+ * Convert from blocksize advertised to the initiator to the 512 byte
+ * units unconditionally used by the Linux block layer.
+ */
+sector_t target_to_linux_sector(struct se_device *dev, sector_t lb)
+{
+       switch (dev->dev_attrib.block_size) {
+       case 4096:
+               return lb << 3;
+       case 2048:
+               return lb << 2;
+       case 1024:
+               return lb << 1;
+       default:
+               return lb;
+       }
+}
+EXPORT_SYMBOL(target_to_linux_sector);
+
 int target_configure_device(struct se_device *dev)
 {
        struct se_hba *hba = dev->se_hba;