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scsi: smartpqi: fix critical ARM issue reading PQI index registers

Browse source 
Use the readl() kernel function to read all index registers. For ARM
systems, this function includes a read memory barrier that eliminates ci/pi
corruption.

Reviewed-by: Scott Benesh <scott.benesh@microsemi.com>
Reviewed-by: Scott Teel <scott.teel@microsemi.com>
Tested-by: Shunyong Yang <shunyong.yang@hxt-semitech.com>
Signed-off-by: Kevin Barnett <kevin.barnett@microsemi.com>
Signed-off-by: Don Brace <don.brace@microsemi.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Kevin Barnett 2018-06-18 13:23:00 -05:00 committed by Martin K. Petersen
parent 9f8d05fa98
commit dac12fbc7b
2 changed files with 30 additions and 25 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

10
drivers/scsi/smartpqi/smartpqi.h
View file

@ -583,8 +583,8 @@ struct pqi_admin_queues_aligned {
struct pqi_admin_queues {
void *iq_element_array;
void *oq_element_array;
volatile pqi_index_t *iq_ci;
volatile pqi_index_t *oq_pi;
pqi_index_t *iq_ci;
pqi_index_t __iomem *oq_pi;
dma_addr_t iq_element_array_bus_addr;
dma_addr_t oq_element_array_bus_addr;
dma_addr_t iq_ci_bus_addr;
@ -608,8 +608,8 @@ struct pqi_queue_group {
dma_addr_t oq_element_array_bus_addr;
__le32 __iomem *iq_pi[2];
pqi_index_t iq_pi_copy[2];
volatile pqi_index_t *iq_ci[2];
volatile pqi_index_t *oq_pi;
pqi_index_t __iomem *iq_ci[2];
pqi_index_t __iomem *oq_pi;
dma_addr_t iq_ci_bus_addr[2];
dma_addr_t oq_pi_bus_addr;
__le32 __iomem *oq_ci;
@ -622,7 +622,7 @@ struct pqi_event_queue {
u16 oq_id;
u16 int_msg_num;
void *oq_element_array;
volatile pqi_index_t *oq_pi;
pqi_index_t __iomem *oq_pi;
dma_addr_t oq_element_array_bus_addr;
dma_addr_t oq_pi_bus_addr;
__le32 __iomem *oq_ci;

45
drivers/scsi/smartpqi/smartpqi_init.c
View file

@ -2703,7 +2703,7 @@ static unsigned int pqi_process_io_intr(struct pqi_ctrl_info *ctrl_info,
oq_ci = queue_group->oq_ci_copy;
while (1) {
oq_pi = *queue_group->oq_pi;
oq_pi = readl(queue_group->oq_pi);
if (oq_pi == oq_ci)
break;
@ -2794,7 +2794,7 @@ static void pqi_send_event_ack(struct pqi_ctrl_info *ctrl_info,
spin_lock_irqsave(&queue_group->submit_lock[RAID_PATH], flags);
iq_pi = queue_group->iq_pi_copy[RAID_PATH];
iq_ci = *queue_group->iq_ci[RAID_PATH];
iq_ci = readl(queue_group->iq_ci[RAID_PATH]);
if (pqi_num_elements_free(iq_pi, iq_ci,
ctrl_info->num_elements_per_iq))
@ -2953,7 +2953,7 @@ static unsigned int pqi_process_event_intr(struct pqi_ctrl_info *ctrl_info)
oq_ci = event_queue->oq_ci_copy;
while (1) {
oq_pi = *event_queue->oq_pi;
oq_pi = readl(event_queue->oq_pi);
if (oq_pi == oq_ci)
break;
@ -3177,7 +3177,7 @@ static int pqi_alloc_operational_queues(struct pqi_ctrl_info *ctrl_info)
size_t element_array_length_per_iq;
size_t element_array_length_per_oq;
void *element_array;
void *next_queue_index;
void __iomem *next_queue_index;
void *aligned_pointer;
unsigned int num_inbound_queues;
unsigned int num_outbound_queues;
@ -3273,7 +3273,7 @@ static int pqi_alloc_operational_queues(struct pqi_ctrl_info *ctrl_info)
element_array += PQI_NUM_EVENT_QUEUE_ELEMENTS *
PQI_EVENT_OQ_ELEMENT_LENGTH;
next_queue_index = PTR_ALIGN(element_array,
next_queue_index = (void __iomem *)PTR_ALIGN(element_array,
PQI_OPERATIONAL_INDEX_ALIGNMENT);
for (i = 0; i < ctrl_info->num_queue_groups; i++) {
@ -3281,21 +3281,24 @@ static int pqi_alloc_operational_queues(struct pqi_ctrl_info *ctrl_info)
queue_group->iq_ci[RAID_PATH] = next_queue_index;
queue_group->iq_ci_bus_addr[RAID_PATH] =
ctrl_info->queue_memory_base_dma_handle +
(next_queue_index - ctrl_info->queue_memory_base);
(next_queue_index -
(void __iomem *)ctrl_info->queue_memory_base);
next_queue_index += sizeof(pqi_index_t);
next_queue_index = PTR_ALIGN(next_queue_index,
PQI_OPERATIONAL_INDEX_ALIGNMENT);
queue_group->iq_ci[AIO_PATH] = next_queue_index;
queue_group->iq_ci_bus_addr[AIO_PATH] =
ctrl_info->queue_memory_base_dma_handle +
(next_queue_index - ctrl_info->queue_memory_base);
(next_queue_index -
(void __iomem *)ctrl_info->queue_memory_base);
next_queue_index += sizeof(pqi_index_t);
next_queue_index = PTR_ALIGN(next_queue_index,
PQI_OPERATIONAL_INDEX_ALIGNMENT);
queue_group->oq_pi = next_queue_index;
queue_group->oq_pi_bus_addr =
ctrl_info->queue_memory_base_dma_handle +
(next_queue_index - ctrl_info->queue_memory_base);
(next_queue_index -
(void __iomem *)ctrl_info->queue_memory_base);
next_queue_index += sizeof(pqi_index_t);
next_queue_index = PTR_ALIGN(next_queue_index,
PQI_OPERATIONAL_INDEX_ALIGNMENT);
@ -3304,7 +3307,8 @@ static int pqi_alloc_operational_queues(struct pqi_ctrl_info *ctrl_info)
ctrl_info->event_queue.oq_pi = next_queue_index;
ctrl_info->event_queue.oq_pi_bus_addr =
ctrl_info->queue_memory_base_dma_handle +
(next_queue_index - ctrl_info->queue_memory_base);
(next_queue_index -
(void __iomem *)ctrl_info->queue_memory_base);
return 0;
}
@ -3378,7 +3382,8 @@ static int pqi_alloc_admin_queues(struct pqi_ctrl_info *ctrl_info)
admin_queues->oq_element_array =
&admin_queues_aligned->oq_element_array;
admin_queues->iq_ci = &admin_queues_aligned->iq_ci;
admin_queues->oq_pi = &admin_queues_aligned->oq_pi;
admin_queues->oq_pi =
(pqi_index_t __iomem *)&admin_queues_aligned->oq_pi;
admin_queues->iq_element_array_bus_addr =
ctrl_info->admin_queue_memory_base_dma_handle +
@ -3394,8 +3399,8 @@ static int pqi_alloc_admin_queues(struct pqi_ctrl_info *ctrl_info)
ctrl_info->admin_queue_memory_base);
admin_queues->oq_pi_bus_addr =
ctrl_info->admin_queue_memory_base_dma_handle +
((void *)admin_queues->oq_pi -
ctrl_info->admin_queue_memory_base);
((void __iomem *)admin_queues->oq_pi -
(void __iomem *)ctrl_info->admin_queue_memory_base);
return 0;
}
@ -3496,7 +3501,7 @@ static int pqi_poll_for_admin_response(struct pqi_ctrl_info *ctrl_info,
timeout = (PQI_ADMIN_REQUEST_TIMEOUT_SECS * HZ) + jiffies;
while (1) {
oq_pi = *admin_queues->oq_pi;
oq_pi = readl(admin_queues->oq_pi);
if (oq_pi != oq_ci)
break;
if (time_after(jiffies, timeout)) {
@ -3555,7 +3560,7 @@ static void pqi_start_io(struct pqi_ctrl_info *ctrl_info,
DIV_ROUND_UP(iu_length,
PQI_OPERATIONAL_IQ_ELEMENT_LENGTH);
iq_ci = *queue_group->iq_ci[path];
iq_ci = readl(queue_group->iq_ci[path]);
if (num_elements_needed > pqi_num_elements_free(iq_pi, iq_ci,
ctrl_info->num_elements_per_iq))
@ -5054,7 +5059,7 @@ static int pqi_wait_until_inbound_queues_empty(struct pqi_ctrl_info *ctrl_info)
iq_pi = queue_group->iq_pi_copy[path];
while (1) {
iq_ci = *queue_group->iq_ci[path];
iq_ci = readl(queue_group->iq_ci[path]);
if (iq_ci == iq_pi)
break;
pqi_check_ctrl_health(ctrl_info);
@ -6243,20 +6248,20 @@ static void pqi_reinit_queues(struct pqi_ctrl_info *ctrl_info)
admin_queues = &ctrl_info->admin_queues;
admin_queues->iq_pi_copy = 0;
admin_queues->oq_ci_copy = 0;
*admin_queues->oq_pi = 0;
writel(0, admin_queues->oq_pi);
for (i = 0; i < ctrl_info->num_queue_groups; i++) {
ctrl_info->queue_groups[i].iq_pi_copy[RAID_PATH] = 0;
ctrl_info->queue_groups[i].iq_pi_copy[AIO_PATH] = 0;
ctrl_info->queue_groups[i].oq_ci_copy = 0;
*ctrl_info->queue_groups[i].iq_ci[RAID_PATH] = 0;
*ctrl_info->queue_groups[i].iq_ci[AIO_PATH] = 0;
*ctrl_info->queue_groups[i].oq_pi = 0;
writel(0, ctrl_info->queue_groups[i].iq_ci[RAID_PATH]);
writel(0, ctrl_info->queue_groups[i].iq_ci[AIO_PATH]);
writel(0, ctrl_info->queue_groups[i].oq_pi);
}
event_queue = &ctrl_info->event_queue;
*event_queue->oq_pi = 0;
writel(0, event_queue->oq_pi);
event_queue->oq_ci_copy = 0;
}