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habanalabs/gaudi2: change device f/w security check

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On Gaudi2 the f/w always configures the PCIe iATU and allows access to
scratchpad registers. Therefore, we can know if the f/w is secured
by reading a status bit from the f/w registers.

Signed-off-by: farah kassabri <fkassabri@habana.ai>
Reviewed-by: Oded Gabbay <ogabbay@kernel.org>
Signed-off-by: Oded Gabbay <ogabbay@kernel.org>
This commit is contained in:
farah kassabri 2022-07-20 13:53:37 +03:00 committed by Oded Gabbay
parent ab6c08f0d5
commit 6419b5232e
2 changed files with 8 additions and 15 deletions
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2
drivers/misc/habanalabs/common/firmware_if.c
View file

@ -1476,6 +1476,8 @@ static void hl_fw_preboot_update_state(struct hl_device *hdev)
*/
prop->hard_reset_done_by_fw = !!(cpu_boot_dev_sts0 & CPU_BOOT_DEV_STS0_FW_HARD_RST_EN);
prop->fw_security_enabled = !!(cpu_boot_dev_sts0 & CPU_BOOT_DEV_STS0_SECURITY_EN);
dev_dbg(hdev->dev, "Firmware preboot boot device status0 %#x\n",
cpu_boot_dev_sts0);

21
drivers/misc/habanalabs/gaudi2/gaudi2.c
View file

@ -2493,7 +2493,6 @@ static int gaudi2_early_init(struct hl_device *hdev)
struct asic_fixed_properties *prop = &hdev->asic_prop;
struct pci_dev *pdev = hdev->pdev;
resource_size_t pci_bar_size;
u32 fw_boot_status;
int rc;
rc = gaudi2_set_fixed_properties(hdev);
@ -2521,22 +2520,14 @@ static int gaudi2_early_init(struct hl_device *hdev)
prop->dram_pci_bar_size = pci_resource_len(pdev, DRAM_BAR_ID);
hdev->dram_pci_bar_start = pci_resource_start(pdev, DRAM_BAR_ID);
/* If FW security is enabled at this point it means no access to ELBI */
if (hdev->asic_prop.fw_security_enabled) {
hdev->asic_prop.iatu_done_by_fw = true;
goto pci_init;
}
rc = hl_pci_elbi_read(hdev, CFG_BASE + mmCPU_BOOT_DEV_STS0, &fw_boot_status);
if (rc)
goto free_queue_props;
/* Check whether FW is configuring iATU */
if ((fw_boot_status & CPU_BOOT_DEV_STS0_ENABLED) &&
(fw_boot_status & CPU_BOOT_DEV_STS0_FW_IATU_CONF_EN))
/*
* Only in pldm driver config iATU
*/
if (hdev->pldm)
hdev->asic_prop.iatu_done_by_fw = false;
else
hdev->asic_prop.iatu_done_by_fw = true;
pci_init:
rc = hl_pci_init(hdev);
if (rc)
goto free_queue_props;