habanalabs: support device memory memset > 4GB

This patch adds support to the goya memset function to perform memset to
device memory with size larger then 4GB. In this case, we need to use
multiple LIN_DMA packets because a single packet supports up to 4GB.
Signed-off-by: Oded Gabbay <oded.gabbay@gmail.com>

drivers/misc/habanalabs/goya/goya.c

@@ -4478,23 +4478,26 @@ void *goya_get_events_stat(struct hl_device *hdev, u32 *size)
 	return goya->events_stat;
 }
 
-static int goya_memset_device_memory(struct hl_device *hdev, u64 addr, u32 size,
+static int goya_memset_device_memory(struct hl_device *hdev, u64 addr, u64 size,
 				u64 val, bool is_dram)
 {
 	struct packet_lin_dma *lin_dma_pkt;
 	struct hl_cs_job *job;
 	u32 cb_size, ctl;
 	struct hl_cb *cb;
-	int rc;
+	int rc, lin_dma_pkts_cnt;
 
-	cb = hl_cb_kernel_create(hdev, PAGE_SIZE);
+	lin_dma_pkts_cnt = DIV_ROUND_UP_ULL(size, SZ_2G);
+	cb_size = lin_dma_pkts_cnt * sizeof(struct packet_lin_dma) +
+						sizeof(struct packet_msg_prot);
+	cb = hl_cb_kernel_create(hdev, cb_size);
 	if (!cb)
-		return -EFAULT;
+		return -ENOMEM;
 
 	lin_dma_pkt = (struct packet_lin_dma *) (uintptr_t) cb->kernel_address;
 
+	do {
 		memset(lin_dma_pkt, 0, sizeof(*lin_dma_pkt));
-	cb_size = sizeof(*lin_dma_pkt);
 
 		ctl = ((PACKET_LIN_DMA << GOYA_PKT_CTL_OPCODE_SHIFT) |
 				(1 << GOYA_PKT_LIN_DMA_CTL_MEMSET_SHIFT) |
@@ -4507,8 +4510,16 @@ static int goya_memset_device_memory(struct hl_device *hdev, u64 addr, u32 size,
 
 		lin_dma_pkt->src_addr = cpu_to_le64(val);
 		lin_dma_pkt->dst_addr = cpu_to_le64(addr);
+		if (lin_dma_pkts_cnt > 1)
+			lin_dma_pkt->tsize = cpu_to_le32(SZ_2G);
+		else
 			lin_dma_pkt->tsize = cpu_to_le32(size);
 
+		size -= SZ_2G;
+		addr += SZ_2G;
+		lin_dma_pkt++;
+	} while (--lin_dma_pkts_cnt);
+
 	job = hl_cs_allocate_job(hdev, true);
 	if (!job) {
 		dev_err(hdev->dev, "Failed to allocate a new job\n");
@@ -4522,7 +4533,7 @@ static int goya_memset_device_memory(struct hl_device *hdev, u64 addr, u32 size,
 	job->user_cb_size = cb_size;
 	job->hw_queue_id = GOYA_QUEUE_ID_DMA_0;
 	job->patched_cb = job->user_cb;
-	job->job_cb_size = job->user_cb_size + sizeof(struct packet_msg_prot);
+	job->job_cb_size = job->user_cb_size;
 
 	hl_debugfs_add_job(hdev, job);