From: Ohad Sharabi osharabi@habana.ai
[ Upstream commit 4fac990f604e6c10538026835a8a30f3c1b6fcf5 ]
Reporting FW errors involves reading of the error registers.
In case we have a corrupted FW descriptor we cannot do that since the dynamic scratchpad is potentially corrupted as well and may cause kernel crush when attempting access to a corrupted register offset.
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: Sasha Levin sashal@kernel.org --- drivers/misc/habanalabs/common/firmware_if.c | 17 +++++++++++++++-- drivers/misc/habanalabs/common/habanalabs.h | 2 ++ 2 files changed, 17 insertions(+), 2 deletions(-)
diff --git a/drivers/misc/habanalabs/common/firmware_if.c b/drivers/misc/habanalabs/common/firmware_if.c index 8d2568c63f19e..a8e683964ab03 100644 --- a/drivers/misc/habanalabs/common/firmware_if.c +++ b/drivers/misc/habanalabs/common/firmware_if.c @@ -1703,6 +1703,9 @@ static int hl_fw_dynamic_validate_descriptor(struct hl_device *hdev, return rc; }
+ /* here we can mark the descriptor as valid as the content has been validated */ + fw_loader->dynamic_loader.fw_desc_valid = true; + return 0; }
@@ -1759,7 +1762,13 @@ static int hl_fw_dynamic_read_and_validate_descriptor(struct hl_device *hdev, return rc; }
- /* extract address copy the descriptor from */ + /* + * extract address to copy the descriptor from + * in addition, as the descriptor value is going to be over-ridden by new data- we mark it + * as invalid. + * it will be marked again as valid once validated + */ + fw_loader->dynamic_loader.fw_desc_valid = false; src = hdev->pcie_bar[region->bar_id] + region->offset_in_bar + response->ram_offset; memcpy_fromio(fw_desc, src, sizeof(struct lkd_fw_comms_desc)); @@ -2239,6 +2248,9 @@ static int hl_fw_dynamic_init_cpu(struct hl_device *hdev, dev_info(hdev->dev, "Loading firmware to device, may take some time...\n");
+ /* initialize FW descriptor as invalid */ + fw_loader->dynamic_loader.fw_desc_valid = false; + /* * In this stage, "cpu_dyn_regs" contains only LKD's hard coded values! * It will be updated from FW after hl_fw_dynamic_request_descriptor(). @@ -2325,7 +2337,8 @@ static int hl_fw_dynamic_init_cpu(struct hl_device *hdev, return 0;
protocol_err: - fw_read_errors(hdev, le32_to_cpu(dyn_regs->cpu_boot_err0), + if (fw_loader->dynamic_loader.fw_desc_valid) + fw_read_errors(hdev, le32_to_cpu(dyn_regs->cpu_boot_err0), le32_to_cpu(dyn_regs->cpu_boot_err1), le32_to_cpu(dyn_regs->cpu_boot_dev_sts0), le32_to_cpu(dyn_regs->cpu_boot_dev_sts1)); diff --git a/drivers/misc/habanalabs/common/habanalabs.h b/drivers/misc/habanalabs/common/habanalabs.h index bebebcb163ee8..dfcd87b98ca08 100644 --- a/drivers/misc/habanalabs/common/habanalabs.h +++ b/drivers/misc/habanalabs/common/habanalabs.h @@ -992,6 +992,7 @@ struct fw_response { * @image_region: region to copy the FW image to * @fw_image_size: size of FW image to load * @wait_for_bl_timeout: timeout for waiting for boot loader to respond + * @fw_desc_valid: true if FW descriptor has been validated and hence the data can be used */ struct dynamic_fw_load_mgr { struct fw_response response; @@ -999,6 +1000,7 @@ struct dynamic_fw_load_mgr { struct pci_mem_region *image_region; size_t fw_image_size; u32 wait_for_bl_timeout; + bool fw_desc_valid; };
/**