[PATCH 4/4] habanalabs: replace GFP_ATOMIC with GFP_KERNEL

Oded Gabbay
2021-02-25T16:21:35Z

From: Ofir Bitton <obitton@habana.ai>

As there are incorrect assumptions in which some of the
initialization and data path flows cannot sleep, most allocations
are being done using GFP_ATOMIC.
We modify the code to use GFP_ATOMIC only when realy needed, as
sleepable flow should use GFP_KERNEL.
In addition add a fallback to allocate memory using GFP_KERNEL,
once ATOMIC allocation fails.

Signed-off-by: Ofir Bitton <obitton@habana.ai>
Reviewed-by: Oded Gabbay <ogabbay@kernel.org>
Signed-off-by: Oded Gabbay <ogabbay@kernel.org>
---
.../misc/habanalabs/common/command_buffer.c | 12 +++++++---
.../habanalabs/common/command_submission.c | 22 ++++++++++++++++++-
drivers/misc/habanalabs/common/device.c | 2 +-
drivers/misc/habanalabs/common/memory.c | 10 +++------
drivers/misc/habanalabs/gaudi/gaudi.c | 2 +-
drivers/misc/habanalabs/goya/goya.c | 2 +-
6 files changed, 36 insertions(+), 14 deletions(-)

diff --git a/drivers/misc/habanalabs/common/command_buffer.c b/drivers/misc/habanalabs/common/command_buffer.c
index d9adb9a5e4d8..719168c980a4 100644
--- a/drivers/misc/habanalabs/common/command_buffer.c
+++ b/drivers/misc/habanalabs/common/command_buffer.c
@@ -181,7 +181,7 @@ static void cb_release(struct kref *ref)
static struct hl_cb *hl_cb_alloc(struct hl_device *hdev, u32 cb_size,
int ctx_id, bool internal_cb)
{
- struct hl_cb *cb;
+ struct hl_cb *cb = NULL;
u32 cb_offset;
void *p;

@@ -193,9 +193,10 @@ static struct hl_cb *hl_cb_alloc(struct hl_device *hdev, u32 cb_size,
* the kernel's copy. Hence, we must never sleep in this code section
* and must use GFP_ATOMIC for all memory allocations.
*/
- if (ctx_id == HL_KERNEL_ASID_ID)
+ if (ctx_id == HL_KERNEL_ASID_ID && !hdev->disabled)
cb = kzalloc(sizeof(*cb), GFP_ATOMIC);
- else
+
+ if (!cb)
cb = kzalloc(sizeof(*cb), GFP_KERNEL);

if (!cb)
@@ -214,6 +215,9 @@ static struct hl_cb *hl_cb_alloc(struct hl_device *hdev, u32 cb_size,
} else if (ctx_id == HL_KERNEL_ASID_ID) {
p = hdev->asic_funcs->asic_dma_alloc_coherent(hdev, cb_size,
&cb->bus_address, GFP_ATOMIC);
+ if (!p)
+ p = hdev->asic_funcs->asic_dma_alloc_coherent(hdev,
+ cb_size, &cb->bus_address, GFP_KERNEL);
} else {
p = hdev->asic_funcs->asic_dma_alloc_coherent(hdev, cb_size,
&cb->bus_address,
@@ -310,6 +314,8 @@ int hl_cb_create(struct hl_device *hdev, struct hl_cb_mgr *mgr,

spin_lock(&mgr->cb_lock);
rc = idr_alloc(&mgr->cb_handles, cb, 1, 0, GFP_ATOMIC);
+ if (rc < 0)
+ rc = idr_alloc(&mgr->cb_handles, cb, 1, 0, GFP_KERNEL);
spin_unlock(&mgr->cb_lock);

if (rc < 0) {
diff --git a/drivers/misc/habanalabs/common/command_submission.c b/drivers/misc/habanalabs/common/command_submission.c
index 98fdb98ff4e4..7d0d3e61a6e7 100644
--- a/drivers/misc/habanalabs/common/command_submission.c
+++ b/drivers/misc/habanalabs/common/command_submission.c
@@ -638,6 +638,9 @@ static int allocate_cs(struct hl_device *hdev, struct hl_ctx *ctx,
cntr = &hdev->aggregated_cs_counters;

cs = kzalloc(sizeof(*cs), GFP_ATOMIC);
+ if (!cs)
+ cs = kzalloc(sizeof(*cs), GFP_KERNEL);
+
if (!cs) {
atomic64_inc(&ctx->cs_counters.out_of_mem_drop_cnt);
atomic64_inc(&cntr->out_of_mem_drop_cnt);
@@ -657,6 +660,9 @@ static int allocate_cs(struct hl_device *hdev, struct hl_ctx *ctx,
spin_lock_init(&cs->job_lock);

cs_cmpl = kmalloc(sizeof(*cs_cmpl), GFP_ATOMIC);
+ if (!cs_cmpl)
+ cs_cmpl = kmalloc(sizeof(*cs_cmpl), GFP_KERNEL);
+
if (!cs_cmpl) {
atomic64_inc(&ctx->cs_counters.out_of_mem_drop_cnt);
atomic64_inc(&cntr->out_of_mem_drop_cnt);
@@ -698,6 +704,10 @@ static int allocate_cs(struct hl_device *hdev, struct hl_ctx *ctx,

cs->jobs_in_queue_cnt = kcalloc(hdev->asic_prop.max_queues,
sizeof(*cs->jobs_in_queue_cnt), GFP_ATOMIC);
+ if (!cs->jobs_in_queue_cnt)
+ cs->jobs_in_queue_cnt = kcalloc(hdev->asic_prop.max_queues,
+ sizeof(*cs->jobs_in_queue_cnt), GFP_KERNEL);
+
if (!cs->jobs_in_queue_cnt) {
atomic64_inc(&ctx->cs_counters.out_of_mem_drop_cnt);
atomic64_inc(&cntr->out_of_mem_drop_cnt);
@@ -927,6 +937,9 @@ struct hl_cs_job *hl_cs_allocate_job(struct hl_device *hdev,
struct hl_cs_job *job;

job = kzalloc(sizeof(*job), GFP_ATOMIC);
+ if (!job)
+ job = kzalloc(sizeof(*job), GFP_KERNEL);
+
if (!job)
return NULL;

@@ -1029,6 +1042,9 @@ static int hl_cs_copy_chunk_array(struct hl_device *hdev,

*cs_chunk_array = kmalloc_array(num_chunks, sizeof(**cs_chunk_array),
GFP_ATOMIC);
+ if (!*cs_chunk_array)
+ *cs_chunk_array = kmalloc_array(num_chunks,
+ sizeof(**cs_chunk_array), GFP_KERNEL);
if (!*cs_chunk_array) {
atomic64_inc(&ctx->cs_counters.out_of_mem_drop_cnt);
atomic64_inc(&hdev->aggregated_cs_counters.out_of_mem_drop_cnt);
@@ -1483,6 +1499,10 @@ static int cs_ioctl_extract_signal_seq(struct hl_device *hdev,
signal_seq_arr = kmalloc_array(signal_seq_arr_len,
sizeof(*signal_seq_arr),
GFP_ATOMIC);
+ if (!signal_seq_arr)
+ signal_seq_arr = kmalloc_array(signal_seq_arr_len,
+ sizeof(*signal_seq_arr),
+ GFP_KERNEL);
if (!signal_seq_arr) {
atomic64_inc(&ctx->cs_counters.out_of_mem_drop_cnt);
atomic64_inc(&hdev->aggregated_cs_counters.out_of_mem_drop_cnt);
@@ -1931,7 +1951,7 @@ static int _hl_interrupt_wait_ioctl(struct hl_device *hdev, struct hl_ctx *ctx,

hl_ctx_get(hdev, ctx);

- pend = kmalloc(sizeof(*pend), GFP_ATOMIC);
+ pend = kmalloc(sizeof(*pend), GFP_KERNEL);
if (!pend) {
hl_ctx_put(ctx);
return -ENOMEM;
diff --git a/drivers/misc/habanalabs/common/device.c b/drivers/misc/habanalabs/common/device.c
index b4321144379c..2cbe9d04c229 100644
--- a/drivers/misc/habanalabs/common/device.c
+++ b/drivers/misc/habanalabs/common/device.c
@@ -327,7 +327,7 @@ static int device_early_init(struct hl_device *hdev)
if (hdev->asic_prop.completion_queues_count) {
hdev->cq_wq = kcalloc(hdev->asic_prop.completion_queues_count,
sizeof(*hdev->cq_wq),
- GFP_ATOMIC);
+ GFP_KERNEL);
if (!hdev->cq_wq) {
rc = -ENOMEM;
goto asid_fini;
diff --git a/drivers/misc/habanalabs/common/memory.c b/drivers/misc/habanalabs/common/memory.c
index c2679896aa50..1b69573369cf 100644
--- a/drivers/misc/habanalabs/common/memory.c
+++ b/drivers/misc/habanalabs/common/memory.c
@@ -145,7 +145,7 @@ static int alloc_device_memory(struct hl_ctx *ctx, struct hl_mem_in *args,

spin_lock(&vm->idr_lock);
handle = idr_alloc(&vm->phys_pg_pack_handles, phys_pg_pack, 1, 0,
- GFP_ATOMIC);
+ GFP_KERNEL);
spin_unlock(&vm->idr_lock);

if (handle < 0) {
@@ -1596,7 +1596,7 @@ static int get_user_memory(struct hl_device *hdev, u64 addr, u64 size,

rc = sg_alloc_table_from_pages(userptr->sgt,
userptr->pages,
- npages, offset, size, GFP_ATOMIC);
+ npages, offset, size, GFP_KERNEL);
if (rc < 0) {
dev_err(hdev->dev, "failed to create SG table from pages\n");
goto put_pages;
@@ -1646,11 +1646,7 @@ int hl_pin_host_memory(struct hl_device *hdev, u64 addr, u64 size,
return -EINVAL;
}

- /*
- * This function can be called also from data path, hence use atomic
- * always as it is not a big allocation.
- */
- userptr->sgt = kzalloc(sizeof(*userptr->sgt), GFP_ATOMIC);
+ userptr->sgt = kzalloc(sizeof(*userptr->sgt), GFP_KERNEL);
if (!userptr->sgt)
return -ENOMEM;

diff --git a/drivers/misc/habanalabs/gaudi/gaudi.c b/drivers/misc/habanalabs/gaudi/gaudi.c
index 4f39737b4808..eee9387c8a26 100644
--- a/drivers/misc/habanalabs/gaudi/gaudi.c
+++ b/drivers/misc/habanalabs/gaudi/gaudi.c
@@ -4873,7 +4873,7 @@ static int gaudi_pin_memory_before_cs(struct hl_device *hdev,
parser->job_userptr_list, &userptr))
goto already_pinned;

- userptr = kzalloc(sizeof(*userptr), GFP_ATOMIC);
+ userptr = kzalloc(sizeof(*userptr), GFP_KERNEL);
if (!userptr)
return -ENOMEM;

diff --git a/drivers/misc/habanalabs/goya/goya.c b/drivers/misc/habanalabs/goya/goya.c
index 20abed6ef7e6..1eaf9c06227c 100644
--- a/drivers/misc/habanalabs/goya/goya.c
+++ b/drivers/misc/habanalabs/goya/goya.c
@@ -3221,7 +3221,7 @@ static int goya_pin_memory_before_cs(struct hl_device *hdev,
parser->job_userptr_list, &userptr))
goto already_pinned;

- userptr = kzalloc(sizeof(*userptr), GFP_ATOMIC);
+ userptr = kzalloc(sizeof(*userptr), GFP_KERNEL);
if (!userptr)
return -ENOMEM;

--
2.25.1