[PATCH V5 08/11] megaraid_sas: Enable or Disable Fast path based on the PCI Threshold Bandwidth

From: Sasikumar Chandrasekaran
Date: Wed Dec 14 2016 - 17:14:20 EST

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Large SEQ IO workload should sent as non fast path commands

This patch is depending on patch 7
This patch is same as V4 and there is no specific update for V5

Signed-off-by: Sasikumar Chandrasekaran <sasikumar.pc@xxxxxxxxxxxx>
---
drivers/scsi/megaraid/megaraid_sas.h | 8 +++++
drivers/scsi/megaraid/megaraid_sas_base.c | 48 +++++++++++++++++++++++++++++
drivers/scsi/megaraid/megaraid_sas_fp.c | 6 ++++
drivers/scsi/megaraid/megaraid_sas_fusion.c | 20 +++++++-----
drivers/scsi/megaraid/megaraid_sas_fusion.h | 2 +-
5 files changed, 75 insertions(+), 9 deletions(-)

diff --git a/drivers/scsi/megaraid/megaraid_sas.h b/drivers/scsi/megaraid/megaraid_sas.h
index 6ddf994..0696903 100644
--- a/drivers/scsi/megaraid/megaraid_sas.h
+++ b/drivers/scsi/megaraid/megaraid_sas.h
@@ -1429,6 +1429,8 @@ enum FW_BOOT_CONTEXT {
#define MFI_1068_FW_HANDSHAKE_OFFSET 0x64
#define MFI_1068_FW_READY 0xDDDD0000

+#define MEGASAS_RAID1_FAST_PATH_STATUS_CHECK_INTERVAL HZ
+
#define MR_MAX_REPLY_QUEUES_OFFSET 0X0000001F
#define MR_MAX_REPLY_QUEUES_EXT_OFFSET 0X003FC000
#define MR_MAX_REPLY_QUEUES_EXT_OFFSET_SHIFT 14
@@ -2101,6 +2103,10 @@ struct megasas_instance {
atomic_t ldio_outstanding;
atomic_t fw_reset_no_pci_access;

+ atomic64_t bytes_wrote; /* used for raid1 fast path enable or disable */
+ atomic_t r1_write_fp_capable;
+
+
struct megasas_instance_template *instancet;
struct tasklet_struct isr_tasklet;
struct work_struct work_init;
@@ -2142,6 +2148,7 @@ struct megasas_instance {
long reset_flags;
struct mutex reset_mutex;
struct timer_list sriov_heartbeat_timer;
+ struct timer_list r1_fp_hold_timer;
char skip_heartbeat_timer_del;
u8 requestorId;
char PlasmaFW111;
@@ -2158,6 +2165,7 @@ struct megasas_instance {
bool is_ventura;
bool msix_combined;
u16 max_raid_mapsize;
+ u64 pci_threshold_bandwidth; /* used to control the fp writes */
};
struct MR_LD_VF_MAP {
u32 size;
diff --git a/drivers/scsi/megaraid/megaraid_sas_base.c b/drivers/scsi/megaraid/megaraid_sas_base.c
index 4518ffc..15a894b 100644
--- a/drivers/scsi/megaraid/megaraid_sas_base.c
+++ b/drivers/scsi/megaraid/megaraid_sas_base.c
@@ -1940,6 +1940,9 @@ void megaraid_sas_kill_hba(struct megasas_instance *instance)
}
/* Complete outstanding ioctls when adapter is killed */
megasas_complete_outstanding_ioctls(instance);
+ if (instance->is_ventura)
+ del_timer_sync(&instance->r1_fp_hold_timer);
+
}

/**
@@ -2438,6 +2441,24 @@ void megasas_sriov_heartbeat_handler(unsigned long instance_addr)
}
}

+/*Handler for disabling/enabling raid 1 fast paths*/
+void megasas_change_r1_fp_status(unsigned long instance_addr)
+{
+ struct megasas_instance *instance =
+ (struct megasas_instance *)instance_addr;
+ if (atomic64_read(&instance->bytes_wrote) >=
+ instance->pci_threshold_bandwidth) {
+
+ atomic64_set(&instance->bytes_wrote, 0);
+ atomic_set(&instance->r1_write_fp_capable, 0);
+ } else {
+ atomic64_set(&instance->bytes_wrote, 0);
+ atomic_set(&instance->r1_write_fp_capable, 1);
+ }
+ mod_timer(&instance->r1_fp_hold_timer,
+ jiffies + MEGASAS_RAID1_FAST_PATH_STATUS_CHECK_INTERVAL);
+}
+
/**
* megasas_wait_for_outstanding - Wait for all outstanding cmds
* @instance: Adapter soft state
@@ -5357,6 +5378,17 @@ static int megasas_init_fw(struct megasas_instance *instance)
instance->skip_heartbeat_timer_del = 1;
}

+ if (instance->is_ventura) {
+ atomic64_set(&instance->bytes_wrote, 0);
+ atomic_set(&instance->r1_write_fp_capable, 1);
+ megasas_start_timer(instance,
+ &instance->r1_fp_hold_timer,
+ megasas_change_r1_fp_status,
+ MEGASAS_RAID1_FAST_PATH_STATUS_CHECK_INTERVAL);
+ dev_info(&instance->pdev->dev, "starting the raid 1 fp timer with interval %d\n",
+ MEGASAS_RAID1_FAST_PATH_STATUS_CHECK_INTERVAL);
+ }
+
return 0;

fail_get_ld_pd_list:
@@ -6147,6 +6179,9 @@ static void megasas_shutdown_controller(struct megasas_instance *instance,
if (instance->requestorId && !instance->skip_heartbeat_timer_del)
del_timer_sync(&instance->sriov_heartbeat_timer);

+ if (instance->is_ventura)
+ del_timer_sync(&instance->r1_fp_hold_timer);
+
megasas_flush_cache(instance);
megasas_shutdown_controller(instance, MR_DCMD_HIBERNATE_SHUTDOWN);

@@ -6273,6 +6308,16 @@ static void megasas_shutdown_controller(struct megasas_instance *instance,
megasas_setup_jbod_map(instance);
instance->unload = 0;

+ if (instance->is_ventura) {
+ atomic64_set(&instance->bytes_wrote, 0);
+ atomic_set(&instance->r1_write_fp_capable, 1);
+ megasas_start_timer(instance,
+ &instance->r1_fp_hold_timer,
+ megasas_change_r1_fp_status,
+ MEGASAS_RAID1_FAST_PATH_STATUS_CHECK_INTERVAL);
+ }
+
+
/*
* Initiate AEN (Asynchronous Event Notification)
*/
@@ -6361,6 +6406,9 @@ static void megasas_detach_one(struct pci_dev *pdev)
if (instance->requestorId && !instance->skip_heartbeat_timer_del)
del_timer_sync(&instance->sriov_heartbeat_timer);

+ if (instance->is_ventura)
+ del_timer_sync(&instance->r1_fp_hold_timer);
+
if (instance->fw_crash_state != UNAVAILABLE)
megasas_free_host_crash_buffer(instance);
scsi_remove_host(instance->host);
diff --git a/drivers/scsi/megaraid/megaraid_sas_fp.c b/drivers/scsi/megaraid/megaraid_sas_fp.c
index dd9639b..6db892a 100644
--- a/drivers/scsi/megaraid/megaraid_sas_fp.c
+++ b/drivers/scsi/megaraid/megaraid_sas_fp.c
@@ -197,9 +197,13 @@ void MR_PopulateDrvRaidMap(struct megasas_instance *instance)

if (instance->max_raid_mapsize) {
fw_map_dyn = fusion->ld_map[(instance->map_id & 1)];
+ if (fw_map_dyn->pci_threshold_bandwidth)
+ instance->pci_threshold_bandwidth =
+ le64_to_cpu(fw_map_dyn->pci_threshold_bandwidth);
#if VD_EXT_DEBUG
dev_dbg(&instance->pdev->dev, "raidMapSize 0x%x fw_map_dyn->descTableOffset 0x%x\n", le32_to_cpu(fw_map_dyn->raid_map_size), le32_to_cpu(fw_map_dyn->desc_table_offset));
dev_dbg(&instance->pdev->dev, "descTableSize 0x%x descTableNumElements 0x%x\n", le32_to_cpu(fw_map_dyn->desc_table_size), le32_to_cpu(fw_map_dyn->desc_table_num_elements));
+ dev_dbg(&instance->pdev->dev, "PCIThreasholdBandwidth %llu\n", instance->pci_threshold_bandwidth);
dev_dbg(&instance->pdev->dev, "drv map %p ldCount %d\n", drv_map, fw_map_dyn->ld_count);
#endif
desc_table =
@@ -387,6 +391,8 @@ void MR_PopulateDrvRaidMap(struct megasas_instance *instance)
sizeof(struct MR_DEV_HANDLE_INFO) *
MAX_RAIDMAP_PHYSICAL_DEVICES);
}
+ if (instance->is_ventura && !instance->pci_threshold_bandwidth)
+ instance->pci_threshold_bandwidth = ULLONG_MAX;
}

/*
diff --git a/drivers/scsi/megaraid/megaraid_sas_fusion.c b/drivers/scsi/megaraid/megaraid_sas_fusion.c
index 5ef35b2..9b08de7 100644
--- a/drivers/scsi/megaraid/megaraid_sas_fusion.c
+++ b/drivers/scsi/megaraid/megaraid_sas_fusion.c
@@ -95,6 +95,7 @@ void megasas_start_timer(struct megasas_instance *instance,
extern unsigned int dual_qdepth_disable;
static void megasas_free_rdpq_fusion(struct megasas_instance *instance);
static void megasas_free_reply_fusion(struct megasas_instance *instance);
+void megasas_change_r1_fp_status(unsigned long instance_addr);

@@ -2620,8 +2621,9 @@ void megasas_prepare_secondRaid1_IO(struct megasas_instance *instance,
* to get new command
*/
if (cmd->is_raid_1_fp_write &&
- atomic_inc_return(&instance->fw_outstanding) >
- (instance->host->can_queue)) {
+ (atomic_inc_return(&instance->fw_outstanding) >
+ (instance->host->can_queue) ||
+ (!atomic_read(&instance->r1_write_fp_capable)))) {
megasas_fpio_to_ldio(instance, cmd, cmd->scmd);
atomic_dec(&instance->fw_outstanding);
} else if (cmd->is_raid_1_fp_write) {
@@ -2630,17 +2632,19 @@ void megasas_prepare_secondRaid1_IO(struct megasas_instance *instance,
megasas_prepare_secondRaid1_IO(instance, cmd, r1_cmd);
}

-
/*
- * Issue the command to the FW
- */
+ * Issue the command to the FW
+ */
+ if (scmd->sc_data_direction == PCI_DMA_TODEVICE && instance->is_ventura)
+ atomic64_add(scsi_bufflen(scmd), &instance->bytes_wrote);

megasas_fire_cmd_fusion(instance, req_desc, instance->is_ventura);

- if (r1_cmd)
+ if (r1_cmd) {
+ atomic64_add(scsi_bufflen(scmd), &instance->bytes_wrote);
megasas_fire_cmd_fusion(instance, r1_cmd->request_desc,
- instance->is_ventura);
-
+ instance->is_ventura);
+ }

return 0;
}
diff --git a/drivers/scsi/megaraid/megaraid_sas_fusion.h b/drivers/scsi/megaraid/megaraid_sas_fusion.h
index 1994207..915af59 100644
--- a/drivers/scsi/megaraid/megaraid_sas_fusion.h
+++ b/drivers/scsi/megaraid/megaraid_sas_fusion.h
@@ -977,7 +977,7 @@ struct MR_FW_RAID_MAP_DYNAMIC {
u32 desc_table_size; /* Total Size of desc table */
/* Total Number of elements in the desc table */
u32 desc_table_num_elements;
- u64 reserved1;
+ u64 pci_threshold_bandwidth;
u32 reserved2[3]; /*future use */
/* timeout value used by driver in FP IOs */
u8 fp_pd_io_timeout_sec;
--
1.8.3.1

Next message: Sasikumar Chandrasekaran: "[PATCH V5 09/11] megaraid_sas: ldio_outstanding variable is not decremented in completion path"
Previous message: Sasikumar Chandrasekaran: "[PATCH V5 11/11] megaraid_sas: driver version upgrade"
In reply to: Sasikumar Chandrasekaran: "[PATCH V5 11/11] megaraid_sas: driver version upgrade"
Next in thread: Tomas Henzl: "Re: [PATCH V5 08/11] megaraid_sas: Enable or Disable Fast path based on the PCI Threshold Bandwidth"
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