habanalabs: add user API to get valid DRAM page sizes

Future devices will support multiple device memory page sizes.
In addition, an API for the user was added for it to be able to control
the device memory allocation page size.

This patch is a complementary patch to inform the user of the available
page size supported by the device.

Signed-off-by: Ohad Sharabi <osharabi@habana.ai>
Reviewed-by: Oded Gabbay <ogabbay@kernel.org>
Signed-off-by: Oded Gabbay <ogabbay@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

4 files changed, 40 insertions, 0 deletions

diff --git a/drivers/misc/habanalabs/common/habanalabs.h b/drivers/misc/habanalabs/common/habanalabs.h
index 6eb35e4124c2..564797766f42 100644
--- a/drivers/misc/habanalabs/common/habanalabs.h
+++ b/drivers/misc/habanalabs/common/habanalabs.h
@@ -1304,6 +1304,7 @@ struct fw_load_mgr {
  * @get_stream_master_qid_arr: get pointer to stream masters QID array
  * @is_valid_dram_page_size: return true if page size is supported in device
  *                           memory allocation, otherwise false.
+ * @get_valid_dram_page_orders: get valid device memory allocation page orders
  */
 struct hl_asic_funcs {
 	int (*early_init)(struct hl_device *hdev);
@@ -1432,6 +1433,7 @@ struct hl_asic_funcs {
 	bool (*is_valid_dram_page_size)(u32 page_size);
 	int (*mmu_get_real_page_size)(struct hl_device *hdev, struct hl_mmu_properties *mmu_prop,
 					u32 page_size, u32 *real_page_size, bool is_dram_addr);
+	void (*get_valid_dram_page_orders)(struct hl_info_dev_memalloc_page_sizes *info);
 };
 
 
diff --git a/drivers/misc/habanalabs/common/habanalabs_ioctl.c b/drivers/misc/habanalabs/common/habanalabs_ioctl.c
index 14c58579b9cd..c6fe35ae1238 100644
--- a/drivers/misc/habanalabs/common/habanalabs_ioctl.c
+++ b/drivers/misc/habanalabs/common/habanalabs_ioctl.c
@@ -591,6 +591,27 @@ static int razwi_info(struct hl_fpriv *hpriv, struct hl_info_args *args)
 	return copy_to_user(out, &info, min_t(size_t, max_size, sizeof(info))) ? -EFAULT : 0;
 }
 
+static int dev_mem_alloc_page_sizes_info(struct hl_fpriv *hpriv, struct hl_info_args *args)
+{
+	void __user *out = (void __user *) (uintptr_t) args->return_pointer;
+	struct hl_info_dev_memalloc_page_sizes info = {0};
+	struct hl_device *hdev = hpriv->hdev;
+	u32 max_size = args->return_size;
+
+	if ((!max_size) || (!out))
+		return -EINVAL;
+
+	/*
+	 * Future ASICs that will support multiple DRAM page sizes will support only "powers of 2"
+	 * pages (unlike some of the ASICs before supporting multiple page sizes).
+	 * For this reason for all ASICs that not support multiple page size the function will
+	 * return an empty bitmask indicating that multiple page sizes is not supported.
+	 */
+	hdev->asic_funcs->get_valid_dram_page_orders(&info);
+
+	return copy_to_user(out, &info, min_t(size_t, max_size, sizeof(info))) ? -EFAULT : 0;
+}
+
 static int _hl_info_ioctl(struct hl_fpriv *hpriv, void *data,
 				struct device *dev)
 {
@@ -641,6 +662,9 @@ static int _hl_info_ioctl(struct hl_fpriv *hpriv, void *data,
 	case HL_INFO_RAZWI_EVENT:
 		return razwi_info(hpriv, args);
 
+	case HL_INFO_DEV_MEM_ALLOC_PAGE_SIZES:
+		return dev_mem_alloc_page_sizes_info(hpriv, args);
+
 	default:
 		break;
 	}
diff --git a/drivers/misc/habanalabs/gaudi/gaudi.c b/drivers/misc/habanalabs/gaudi/gaudi.c
index 5979434d1905..64cb195bc26e 100644
--- a/drivers/misc/habanalabs/gaudi/gaudi.c
+++ b/drivers/misc/habanalabs/gaudi/gaudi.c
@@ -9378,6 +9378,12 @@ static u32 *gaudi_get_stream_master_qid_arr(void)
 	return gaudi_stream_master;
 }
 
+static void gaudi_get_valid_dram_page_orders(struct hl_info_dev_memalloc_page_sizes *info)
+{
+	/* set 0 since multiple pages are not supported */
+	info->page_order_bitmask = 0;
+}
+
 static ssize_t infineon_ver_show(struct device *dev, struct device_attribute *attr, char *buf)
 {
 	struct hl_device *hdev = dev_get_drvdata(dev);
@@ -9489,6 +9495,7 @@ static const struct hl_asic_funcs gaudi_funcs = {
 	.get_stream_master_qid_arr = gaudi_get_stream_master_qid_arr,
 	.is_valid_dram_page_size = NULL,
 	.mmu_get_real_page_size = hl_mmu_get_real_page_size,
+	.get_valid_dram_page_orders = gaudi_get_valid_dram_page_orders,
 };
 
 /**
diff --git a/drivers/misc/habanalabs/goya/goya.c b/drivers/misc/habanalabs/goya/goya.c
index ec347bd3bb69..b18288070754 100644
--- a/drivers/misc/habanalabs/goya/goya.c
+++ b/drivers/misc/habanalabs/goya/goya.c
@@ -5679,6 +5679,12 @@ static u32 *goya_get_stream_master_qid_arr(void)
 	return NULL;
 }
 
+static void goya_get_valid_dram_page_orders(struct hl_info_dev_memalloc_page_sizes *info)
+{
+	/* set 0 since multiple pages are not supported */
+	info->page_order_bitmask = 0;
+}
+
 static const struct hl_asic_funcs goya_funcs = {
 	.early_init = goya_early_init,
 	.early_fini = goya_early_fini,
@@ -5767,6 +5773,7 @@ static const struct hl_asic_funcs goya_funcs = {
 	.get_stream_master_qid_arr = goya_get_stream_master_qid_arr,
 	.is_valid_dram_page_size = NULL,
 	.mmu_get_real_page_size = hl_mmu_get_real_page_size,
+	.get_valid_dram_page_orders = goya_get_valid_dram_page_orders,
 };
 
 /*