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

From: Curtis Malainey
Date: Wed Nov 17 2021 - 14:08:44 EST

On Wed, Nov 17, 2021 at 1:38 AM Daniel Baluta <daniel.baluta@xxxxxxxxxxx> wrote:
>
> 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>

Sorry github must be attached to the wrong email, please use

Reviewed-by: Curtis Malainey <cujomalainey@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
>