accel/habanalabs: expose engine core int reg address

In order for engine cores to raise interrupts towards FW, They need
to know which register the event data should be written to.
Hence, we forward the relevant scratchpad register received during
dynamic regs handshake with FW.
Signed-off-by: Ofir Bitton <obitton@habana.ai>
Reviewed-by: Oded Gabbay <ogabbay@kernel.org>
Signed-off-by: Oded Gabbay <ogabbay@kernel.org>
Reviewed-by: Stanislaw Gruszka <stanislaw.gruszka@linux.intel.com>

drivers/accel/habanalabs/common/habanalabs.h

@@ -592,6 +592,8 @@ struct hl_hints_range {
  * @host_base_address: host physical start address for host DMA from device
  * @host_end_address: host physical end address for host DMA from device
  * @max_freq_value: current max clk frequency.
+ * @engine_core_interrupt_reg_addr: interrupt register address for engine core to use
+ *                                  in order to raise events toward FW.
  * @clk_pll_index: clock PLL index that specify which PLL determines the clock
  *                 we display to the user
  * @mmu_pgt_size: MMU page tables total size.
@@ -739,6 +741,7 @@ struct asic_fixed_properties {
 	u64				host_base_address;
 	u64				host_end_address;
 	u64				max_freq_value;
+	u64				engine_core_interrupt_reg_addr;
 	u32				clk_pll_index;
 	u32				mmu_pgt_size;
 	u32				mmu_pte_size;

drivers/accel/habanalabs/common/habanalabs_ioctl.c

@@ -107,6 +107,7 @@ static int hw_ip_info(struct hl_device *hdev, struct hl_info_args *args)
 	hw_ip.server_type = prop->server_type;
 	hw_ip.security_enabled = prop->fw_security_enabled;
 	hw_ip.revision_id = hdev->pdev->revision;
+	hw_ip.engine_core_interrupt_reg_addr = prop->engine_core_interrupt_reg_addr;
 
 	return copy_to_user(out, &hw_ip,
 		min((size_t) size, sizeof(hw_ip))) ? -EFAULT : 0;

drivers/accel/habanalabs/gaudi2/gaudi2.c

@@ -2933,6 +2933,7 @@ static bool gaudi2_is_arc_tpc_owned(u64 arc_id)
 
 static void gaudi2_init_arcs(struct hl_device *hdev)
 {
+	struct cpu_dyn_regs *dyn_regs = &hdev->fw_loader.dynamic_loader.comm_desc.cpu_dyn_regs;
 	struct gaudi2_device *gaudi2 = hdev->asic_specific;
 	u64 arc_id;
 	u32 i;
@@ -2962,6 +2963,10 @@ static void gaudi2_init_arcs(struct hl_device *hdev)
 
 		gaudi2_set_arc_id_cap(hdev, arc_id);
 	}
+
+	/* Fetch ARC scratchpad address */
+	hdev->asic_prop.engine_core_interrupt_reg_addr =
+		CFG_BASE + le32_to_cpu(dyn_regs->eng_arc_irq_ctrl);
 }
 
 static int gaudi2_scrub_arc_dccm(struct hl_device *hdev, u32 cpu_id)

include/uapi/drm/habanalabs_accel.h

@@ -885,6 +885,8 @@ enum hl_server_type {
  *                             application to use. Relevant for Gaudi2 and later.
  * @device_mem_alloc_default_page_size: default page size used in device memory allocation.
  * @revision_id: PCI revision ID of the ASIC.
+ * @engine_core_interrupt_reg_addr: interrupt register address for engine core to use
+ *                                  in order to raise events toward FW.
  */
 struct hl_info_hw_ip_info {
 	__u64 sram_base_address;
@@ -921,6 +923,9 @@ struct hl_info_hw_ip_info {
 	__u8 reserved8;
 	__u8 revision_id;
 	__u8 pad[2];
+	__u32 reserved9;
+	__u8 pad3[4];
+	__u64 engine_core_interrupt_reg_addr;
 };
 
 struct hl_info_dram_usage {