[PATCH 13/21] ASoC: SOF: amd: Add support for SOF firmware authentication

From: Daniel Baluta
Date: Wed Nov 17 2021 - 04:39:24 EST

From: Ajit Kumar Pandey <AjitKumar.Pandey@xxxxxxx>

Add callback to notify PSP after loading firmware on DSP. PSP will
validate the loaded firmware and set qualifier bit to run firmware
on secured AMD systems.

Signed-off-by: Julian Schroeder <Julian.Schroeder@xxxxxxx>
Signed-off-by: Ajit Kumar Pandey <AjitKumar.Pandey@xxxxxxx>
Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@xxxxxxxxxxxxxxx>
Reviewed-by: Ranjani Sridharan <ranjani.sridharan@xxxxxxxxxxxxxxx>
Reviewed-by: Curtis Malainey <curtis@xxxxxxxxxxxx>
Signed-off-by: Daniel Baluta <daniel.baluta@xxxxxxx>
---
sound/soc/sof/amd/acp-dsp-offset.h | 4 ++
sound/soc/sof/amd/acp.c | 66 +++++++++++++++++++++++++++++-
sound/soc/sof/amd/acp.h | 21 ++++++++++
sound/soc/sof/amd/pci-rn.c | 5 +++
4 files changed, 95 insertions(+), 1 deletion(-)

diff --git a/sound/soc/sof/amd/acp-dsp-offset.h b/sound/soc/sof/amd/acp-dsp-offset.h
index 1d11e9d69dce..63f13c111b24 100644
--- a/sound/soc/sof/amd/acp-dsp-offset.h
+++ b/sound/soc/sof/amd/acp-dsp-offset.h
@@ -54,6 +54,9 @@
#define ACP_PGFSM_STATUS 0x1420

/* Registers from ACP_INTR block */
+#define ACP_EXTERNAL_INTR_ENB 0x1800
+#define ACP_EXTERNAL_INTR_CNTL 0x1804
+#define ACP_EXTERNAL_INTR_STAT 0x1808
#define ACP_DSP_SW_INTR_CNTL 0x1814
#define ACP_DSP_SW_INTR_STAT 0x1818
#define ACP_SW_INTR_TRIG 0x181C
@@ -68,6 +71,7 @@
#define ACP_SHA_DMA_CMD_STS 0x1CC0
#define ACP_SHA_DMA_ERR_STATUS 0x1CC4
#define ACP_SHA_TRANSFER_BYTE_CNT 0x1CC8
+#define ACP_SHA_PSP_ACK 0x1C74

#define ACP_SCRATCH_REG_0 0x10000

diff --git a/sound/soc/sof/amd/acp.c b/sound/soc/sof/amd/acp.c
index 74ede28aa8d8..4c5550e8d364 100644
--- a/sound/soc/sof/amd/acp.c
+++ b/sound/soc/sof/amd/acp.c
@@ -20,6 +20,22 @@
#include "acp.h"
#include "acp-dsp-offset.h"

+static int smn_write(struct pci_dev *dev, u32 smn_addr, u32 data)
+{
+ pci_write_config_dword(dev, 0x60, smn_addr);
+ pci_write_config_dword(dev, 0x64, data);
+
+ return 0;
+}
+
+static int smn_read(struct pci_dev *dev, u32 smn_addr, u32 *data)
+{
+ pci_write_config_dword(dev, 0x60, smn_addr);
+ pci_read_config_dword(dev, 0x64, data);
+
+ return 0;
+}
+
static void configure_acp_groupregisters(struct acp_dev_data *adata)
{
struct snd_sof_dev *sdev = adata->dev;
@@ -135,6 +151,25 @@ int configure_and_run_dma(struct acp_dev_data *adata, unsigned int src_addr,
return ret;
}

+static int psp_fw_validate(struct acp_dev_data *adata)
+{
+ struct snd_sof_dev *sdev = adata->dev;
+ int timeout;
+ u32 data;
+
+ smn_write(adata->smn_dev, MP0_C2PMSG_26_REG, MBOX_ACP_SHA_DMA_COMMAND);
+
+ for (timeout = ACP_PSP_TIMEOUT_COUNTER; timeout > 0; timeout--) {
+ msleep(20);
+ smn_read(adata->smn_dev, MP0_C2PMSG_26_REG, &data);
+ if (data & MBOX_READY_MASK)
+ return 0;
+ }
+
+ dev_err(sdev->dev, "FW validation timedout: status %x\n", data & MBOX_STATUS_MASK);
+ return -ETIMEDOUT;
+}
+
int configure_and_run_sha_dma(struct acp_dev_data *adata, void *image_addr,
unsigned int start_addr, unsigned int dest_addr,
unsigned int image_length)
@@ -174,7 +209,9 @@ int configure_and_run_sha_dma(struct acp_dev_data *adata, void *image_addr,
return ret;
}

- snd_sof_dsp_write(sdev, ACP_DSP_BAR, ACP_SHA_DSP_FW_QUALIFIER, DSP_FW_RUN_ENABLE);
+ ret = psp_fw_validate(adata);
+ if (ret)
+ return ret;

fw_qualifier = snd_sof_dsp_read(sdev, ACP_DSP_BAR, ACP_SHA_DSP_FW_QUALIFIER);
if (!(fw_qualifier & DSP_FW_RUN_ENABLE)) {
@@ -238,6 +275,13 @@ static irqreturn_t acp_irq_thread(int irq, void *context)
struct snd_sof_dev *sdev = context;
unsigned int val;

+ val = snd_sof_dsp_read(sdev, ACP_DSP_BAR, ACP_EXTERNAL_INTR_STAT);
+ if (val & ACP_SHA_STAT) {
+ /* Clear SHA interrupt raised by PSP */
+ snd_sof_dsp_write(sdev, ACP_DSP_BAR, ACP_EXTERNAL_INTR_STAT, val);
+ return IRQ_HANDLED;
+ }
+
val = snd_sof_dsp_read(sdev, ACP_DSP_BAR, ACP_DSP_SW_INTR_STAT);
if (val & ACP_DSP_TO_HOST_IRQ) {
sof_ops(sdev)->irq_thread(irq, sdev);
@@ -326,6 +370,7 @@ int amd_sof_acp_probe(struct snd_sof_dev *sdev)
{
struct pci_dev *pci = to_pci_dev(sdev->dev);
struct acp_dev_data *adata;
+ const struct sof_amd_acp_desc *chip;
unsigned int addr;
int ret;

@@ -346,18 +391,32 @@ int amd_sof_acp_probe(struct snd_sof_dev *sdev)

sdev->pdata->hw_pdata = adata;

+ chip = get_chip_info(sdev->pdata);
+ if (!chip) {
+ dev_err(sdev->dev, "no such device supported, chip id:%x\n", pci->device);
+ return -EIO;
+ }
+
+ adata->smn_dev = pci_get_device(PCI_VENDOR_ID_AMD, chip->host_bridge_id, NULL);
+ if (!adata->smn_dev) {
+ dev_err(sdev->dev, "Failed to get host bridge device\n");
+ return -ENODEV;
+ }
+
sdev->ipc_irq = pci->irq;
ret = request_threaded_irq(sdev->ipc_irq, acp_irq_handler, acp_irq_thread,
IRQF_SHARED, "AudioDSP", sdev);
if (ret < 0) {
dev_err(sdev->dev, "failed to register IRQ %d\n",
sdev->ipc_irq);
+ pci_dev_put(adata->smn_dev);
return ret;
}

ret = acp_init(sdev);
if (ret < 0) {
free_irq(sdev->ipc_irq, sdev);
+ pci_dev_put(adata->smn_dev);
return ret;
}

@@ -371,6 +430,11 @@ EXPORT_SYMBOL_NS(amd_sof_acp_probe, SND_SOC_SOF_AMD_COMMON);

int amd_sof_acp_remove(struct snd_sof_dev *sdev)
{
+ struct acp_dev_data *adata = sdev->pdata->hw_pdata;
+
+ if (adata->smn_dev)
+ pci_dev_put(adata->smn_dev);
+
if (sdev->ipc_irq)
free_irq(sdev->ipc_irq, sdev);

diff --git a/sound/soc/sof/amd/acp.h b/sound/soc/sof/amd/acp.h
index fd923f72a01a..a2f8e4219066 100644
--- a/sound/soc/sof/amd/acp.h
+++ b/sound/soc/sof/amd/acp.h
@@ -52,6 +52,15 @@

#define ACP_DSP_TO_HOST_IRQ 0x04

+#define HOST_BRIDGE_CZN 0x1630
+#define ACP_SHA_STAT 0x8000
+#define ACP_PSP_TIMEOUT_COUNTER 5
+#define ACP_EXT_INTR_ERROR_STAT 0x20000000
+#define MP0_C2PMSG_26_REG 0x03810570
+#define MBOX_ACP_SHA_DMA_COMMAND 0x330000
+#define MBOX_READY_MASK 0x80000000
+#define MBOX_STATUS_MASK 0xFFFF
+
struct acp_atu_grp_pte {
u32 low;
u32 high;
@@ -140,6 +149,7 @@ struct acp_dev_data {
struct dma_descriptor dscr_info[ACP_MAX_DESC];
struct acp_dsp_stream stream_buf[ACP_MAX_STREAM];
struct acp_dsp_stream *dtrace_stream;
+ struct pci_dev *smn_dev;
};

void memcpy_to_scratch(struct snd_sof_dev *sdev, u32 offset, unsigned int *src, size_t bytes);
@@ -202,4 +212,15 @@ int snd_amd_acp_find_config(struct pci_dev *pci);
/* Trace */
int acp_sof_trace_init(struct snd_sof_dev *sdev, u32 *stream_tag);
int acp_sof_trace_release(struct snd_sof_dev *sdev);
+
+struct sof_amd_acp_desc {
+ unsigned int host_bridge_id;
+};
+
+static inline const struct sof_amd_acp_desc *get_chip_info(struct snd_sof_pdata *pdata)
+{
+ const struct sof_dev_desc *desc = pdata->desc;
+
+ return desc->chip_info;
+}
#endif
diff --git a/sound/soc/sof/amd/pci-rn.c b/sound/soc/sof/amd/pci-rn.c
index 3c379a5ef231..392ffbdf6417 100644
--- a/sound/soc/sof/amd/pci-rn.c
+++ b/sound/soc/sof/amd/pci-rn.c
@@ -43,12 +43,17 @@ static const struct resource renoir_res[] = {
},
};

+static const struct sof_amd_acp_desc renoir_chip_info = {
+ .host_bridge_id = HOST_BRIDGE_CZN,
+};
+
static const struct sof_dev_desc renoir_desc = {
.machines = snd_soc_acpi_amd_sof_machines,
.resindex_lpe_base = 0,
.resindex_pcicfg_base = -1,
.resindex_imr_base = -1,
.irqindex_host_ipc = -1,
+ .chip_info = &renoir_chip_info,
.default_fw_path = "amd/sof",
.default_tplg_path = "amd/sof-tplg",
.default_fw_filename = "sof-rn.ri",
--
2.27.0