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authorJoe Carnuccio <joe.carnuccio@qlogic.com>2012-11-21 02:40:37 -0500
committerJames Bottomley <JBottomley@Parallels.com>2012-11-30 15:11:16 +0000
commit4ea2c9c7b32f808cb2743f2e349a614aa3a46088 (patch)
tree8ecb3f529a11815db5c783c64df3f521fe0c9567 /drivers/scsi
parent807fb6d8afad1552c6981256a83bc2c0ce4e2125 (diff)
[SCSI] qla2xxx: Add acquiring of risc semaphore before doing ISP reset.
Try to acquire the semaphore; if semaphore is hung then acquire it by force. The ISP reset clears the semaphore, thereby implicitly releasing it. Signed-off-by: Joe Carnuccio <joe.carnuccio@qlogic.com> Signed-off-by: Saurav Kashyap <saurav.kashyap@qlogic.com> Signed-off-by: James Bottomley <JBottomley@Parallels.com>
Diffstat (limited to 'drivers/scsi')
-rw-r--r--drivers/scsi/qla2xxx/qla_fw.h21
-rw-r--r--drivers/scsi/qla2xxx/qla_init.c79
2 files changed, 100 insertions, 0 deletions
diff --git a/drivers/scsi/qla2xxx/qla_fw.h b/drivers/scsi/qla2xxx/qla_fw.h
index 59524aa0ab3..be6d61a89ed 100644
--- a/drivers/scsi/qla2xxx/qla_fw.h
+++ b/drivers/scsi/qla2xxx/qla_fw.h
@@ -1092,6 +1092,27 @@ struct device_reg_24xx {
uint32_t unused_6[2]; /* Gap. */
uint32_t iobase_sdata;
};
+/* RISC-RISC semaphore register PCI offet */
+#define RISC_REGISTER_BASE_OFFSET 0x7010
+#define RISC_REGISTER_WINDOW_OFFET 0x6
+
+/* RISC-RISC semaphore/flag register (risc address 0x7016) */
+
+#define RISC_SEMAPHORE 0x1UL
+#define RISC_SEMAPHORE_WE (RISC_SEMAPHORE << 16)
+#define RISC_SEMAPHORE_CLR (RISC_SEMAPHORE_WE | 0x0UL)
+#define RISC_SEMAPHORE_SET (RISC_SEMAPHORE_WE | RISC_SEMAPHORE)
+
+#define RISC_SEMAPHORE_FORCE 0x8000UL
+#define RISC_SEMAPHORE_FORCE_WE (RISC_SEMAPHORE_FORCE << 16)
+#define RISC_SEMAPHORE_FORCE_CLR (RISC_SEMAPHORE_FORCE_WE | 0x0UL)
+#define RISC_SEMAPHORE_FORCE_SET \
+ (RISC_SEMAPHORE_FORCE_WE | RISC_SEMAPHORE_FORCE)
+
+/* RISC semaphore timeouts (ms) */
+#define TIMEOUT_SEMAPHORE 2500
+#define TIMEOUT_SEMAPHORE_FORCE 2000
+#define TIMEOUT_TOTAL_ELAPSED 4500
/* Trace Control *************************************************************/
diff --git a/drivers/scsi/qla2xxx/qla_init.c b/drivers/scsi/qla2xxx/qla_init.c
index b7e42a80e16..7464a4731ef 100644
--- a/drivers/scsi/qla2xxx/qla_init.c
+++ b/drivers/scsi/qla2xxx/qla_init.c
@@ -1095,6 +1095,83 @@ qla24xx_reset_risc(scsi_qla_host_t *vha)
ha->isp_ops->enable_intrs(ha);
}
+static void
+qla25xx_read_risc_sema_reg(scsi_qla_host_t *vha, uint32_t *data)
+{
+ struct device_reg_24xx __iomem *reg = &vha->hw->iobase->isp24;
+
+ WRT_REG_DWORD(&reg->iobase_addr, RISC_REGISTER_BASE_OFFSET);
+ *data = RD_REG_DWORD(&reg->iobase_window + RISC_REGISTER_WINDOW_OFFET);
+
+}
+
+static void
+qla25xx_write_risc_sema_reg(scsi_qla_host_t *vha, uint32_t data)
+{
+ struct device_reg_24xx __iomem *reg = &vha->hw->iobase->isp24;
+
+ WRT_REG_DWORD(&reg->iobase_addr, RISC_REGISTER_BASE_OFFSET);
+ WRT_REG_DWORD(&reg->iobase_window + RISC_REGISTER_WINDOW_OFFET, data);
+}
+
+static void
+qla25xx_manipulate_risc_semaphore(scsi_qla_host_t *vha)
+{
+ struct qla_hw_data *ha = vha->hw;
+ uint32_t wd32 = 0;
+ uint delta_msec = 100;
+ uint elapsed_msec = 0;
+ uint timeout_msec;
+ ulong n;
+
+ if (!IS_QLA25XX(ha) && !IS_QLA2031(ha))
+ return;
+
+attempt:
+ timeout_msec = TIMEOUT_SEMAPHORE;
+ n = timeout_msec / delta_msec;
+ while (n--) {
+ qla25xx_write_risc_sema_reg(vha, RISC_SEMAPHORE_SET);
+ qla25xx_read_risc_sema_reg(vha, &wd32);
+ if (wd32 & RISC_SEMAPHORE)
+ break;
+ msleep(delta_msec);
+ elapsed_msec += delta_msec;
+ if (elapsed_msec > TIMEOUT_TOTAL_ELAPSED)
+ goto force;
+ }
+
+ if (!(wd32 & RISC_SEMAPHORE))
+ goto force;
+
+ if (!(wd32 & RISC_SEMAPHORE_FORCE))
+ goto acquired;
+
+ qla25xx_write_risc_sema_reg(vha, RISC_SEMAPHORE_CLR);
+ timeout_msec = TIMEOUT_SEMAPHORE_FORCE;
+ n = timeout_msec / delta_msec;
+ while (n--) {
+ qla25xx_read_risc_sema_reg(vha, &wd32);
+ if (!(wd32 & RISC_SEMAPHORE_FORCE))
+ break;
+ msleep(delta_msec);
+ elapsed_msec += delta_msec;
+ if (elapsed_msec > TIMEOUT_TOTAL_ELAPSED)
+ goto force;
+ }
+
+ if (wd32 & RISC_SEMAPHORE_FORCE)
+ qla25xx_write_risc_sema_reg(vha, RISC_SEMAPHORE_FORCE_CLR);
+
+ goto attempt;
+
+force:
+ qla25xx_write_risc_sema_reg(vha, RISC_SEMAPHORE_FORCE_SET);
+
+acquired:
+ return;
+}
+
/**
* qla24xx_reset_chip() - Reset ISP24xx chip.
* @ha: HA context
@@ -1113,6 +1190,8 @@ qla24xx_reset_chip(scsi_qla_host_t *vha)
ha->isp_ops->disable_intrs(ha);
+ qla25xx_manipulate_risc_semaphore(vha);
+
/* Perform RISC reset. */
qla24xx_reset_risc(vha);
}