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Subject[PATCH v5 10/12] [SCSI] sr: check support for device busy class events
Date
From: Aaron Lu <aaron.lu@amd.com>

Signed-off-by: Aaron Lu <aaron.lu@amd.com>
---
drivers/scsi/sr.c | 23 +++++++++++++++++++++++
drivers/scsi/sr.h | 1 +
include/linux/cdrom.h | 43 +++++++++++++++++++++++++++++++++++++++++++
3 files changed, 67 insertions(+)
diff --git a/drivers/scsi/sr.c b/drivers/scsi/sr.c
index 5fc97d2..abfefab 100644
--- a/drivers/scsi/sr.c
+++ b/drivers/scsi/sr.c
@@ -101,6 +101,7 @@ static DEFINE_MUTEX(sr_ref_mutex);
static int sr_open(struct cdrom_device_info *, int);
static void sr_release(struct cdrom_device_info *);

+static void check_dbml(struct scsi_cd *);
static void get_sectorsize(struct scsi_cd *);
static void get_capabilities(struct scsi_cd *);

@@ -728,6 +729,28 @@ static int sr_probe(struct device *dev)
return error;
}

+static void check_dbml(struct scsi_cd *cd)
+{
+ struct packet_command cgc;
+ unsigned char buffer[16];
+ struct rm_feature_desc *rfd;
+
+ init_cdrom_command(&cgc, buffer, sizeof(buffer), CGC_DATA_READ);
+ cgc.cmd[0] = GPCMD_GET_CONFIGURATION;
+ cgc.cmd[3] = CDF_RM;
+ cgc.cmd[8] = sizeof(buffer);
+ cgc.quiet = 1;
+
+ if (cd->cdi.ops->generic_packet(&cd->cdi, &cgc))
+ return;
+
+ rfd = (struct rm_feature_desc *)&buffer[sizeof(struct feature_header)];
+ if (be16_to_cpu(rfd->feature_code) != CDF_RM)
+ return;
+
+ if (rfd->dbml)
+ cd->dbml = 1;
+}

static void get_sectorsize(struct scsi_cd *cd)
{
diff --git a/drivers/scsi/sr.h b/drivers/scsi/sr.h
index 37c8f6b..7cc40ad 100644
--- a/drivers/scsi/sr.h
+++ b/drivers/scsi/sr.h
@@ -41,6 +41,7 @@ typedef struct scsi_cd {
unsigned readcd_known:1; /* drive supports READ_CD (0xbe) */
unsigned readcd_cdda:1; /* reading audio data using READ_CD */
unsigned media_present:1; /* media is present */
+ unsigned dbml:1; /* generates device busy class events */

/* GET_EVENT spurious event handling, blk layer guarantees exclusion */
int tur_mismatch; /* nr of get_event TUR mismatches */
diff --git a/include/linux/cdrom.h b/include/linux/cdrom.h
index dfd7f18..25f305c 100644
--- a/include/linux/cdrom.h
+++ b/include/linux/cdrom.h
@@ -727,6 +727,7 @@ struct request_sense {
/*
* feature profile
*/
+#define CDF_RM 0x0003 /* "Removeable Medium" */
#define CDF_RWRT 0x0020 /* "Random Writable" */
#define CDF_HWDM 0x0024 /* "Hardware Defect Management" */
#define CDF_MRW 0x0028
@@ -739,6 +740,48 @@ struct request_sense {
#define CDM_MRW_BGFORMAT_ACTIVE 2
#define CDM_MRW_BGFORMAT_COMPLETE 3

+/* Removable medium feature descriptor */
+struct rm_feature_desc {
+ __be16 feature_code;
+#if defined(__BIG_ENDIAN_BITFIELD)
+ __u8 reserved1 : 2;
+ __u8 feature_version : 4;
+ __u8 persistent : 1;
+ __u8 curr : 1;
+#elif defined(__LITTLE_ENDIAN_BITFIELD)
+ __u8 curr : 1;
+ __u8 persistent : 1;
+ __u8 feature_version : 4;
+ __u8 reserved1 : 2;
+#endif
+ __u8 add_len;
+#if defined(__BIG_ENDIAN_BITFIELD)
+ __u8 mech_type : 3;
+ __u8 load : 1;
+ __u8 eject : 1;
+ __u8 pvnt_jmpr : 1;
+ __u8 dbml : 1;
+ __u8 lock : 1;
+#elif defined(__LITTLE_ENDIAN_BITFIELD)
+ __u8 lock : 1;
+ __u8 dbml : 1;
+ __u8 pvnt_jmpr : 1;
+ __u8 eject : 1;
+ __u8 load : 1;
+ __u8 mech_type : 3;
+#endif
+ __u8 reserved2;
+ __u8 reserved3;
+ __u8 reserved4;
+};
+
+struct device_busy_event_desc {
+ __u8 device_busy_event : 4;
+ __u8 reserved1 : 4;
+ __u8 device_busy_status;
+ __u8 time;
+};
+
/*
* mrw address spaces
*/
--
1.7.10


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