Re: [PATCH v2 4/5] media: venus: add no TZ boot and shutdown routine

Jordan Crouse
2018-06-01T21:30:43Z

On Sat, Jun 02, 2018 at 01:56:07AM +0530, Vikash Garodia wrote:
> Video hardware is mainly comprised of vcodec subsystem
> and video control subsystem. Video control has ARM9 which
> executes the video firmware instructions whereas vcodec
> does the video frame processing.
> This change adds support to load the video firmware and
> bring ARM9 out of reset for platforms which does not
> have trustzone.
>
> Signed-off-by: Vikash Garodia <vgarodia@codeaurora.org>
> ---
> drivers/media/platform/qcom/venus/core.c | 6 +-
> drivers/media/platform/qcom/venus/core.h | 5 ++
> drivers/media/platform/qcom/venus/firmware.c | 86 ++++++++++++++++++++++++++--
> drivers/media/platform/qcom/venus/firmware.h | 7 ++-
> 4 files changed, 94 insertions(+), 10 deletions(-)
>
> diff --git a/drivers/media/platform/qcom/venus/core.c b/drivers/media/platform/qcom/venus/core.c
> index 9a95f9a..101612b 100644
> --- a/drivers/media/platform/qcom/venus/core.c
> +++ b/drivers/media/platform/qcom/venus/core.c
> @@ -76,7 +76,7 @@ static void venus_sys_error_handler(struct work_struct *work)
> hfi_core_deinit(core, true);
> hfi_destroy(core);
> mutex_lock(&core->lock);
> - venus_shutdown(core->dev);
> + venus_shutdown(core);
>
> pm_runtime_put_sync(core->dev);
>
> @@ -318,7 +318,7 @@ static int venus_probe(struct platform_device *pdev)
> err_core_deinit:
> hfi_core_deinit(core, false);
> err_venus_shutdown:
> - venus_shutdown(dev);
> + venus_shutdown(core);
> err_runtime_disable:
> pm_runtime_set_suspended(dev);
> pm_runtime_disable(dev);
> @@ -339,7 +339,7 @@ static int venus_remove(struct platform_device *pdev)
> WARN_ON(ret);
>
> hfi_destroy(core);
> - venus_shutdown(dev);
> + venus_shutdown(core);
> of_platform_depopulate(dev);
>
> pm_runtime_put_sync(dev);
> diff --git a/drivers/media/platform/qcom/venus/core.h b/drivers/media/platform/qcom/venus/core.h
> index e7bfb63..f04e25e 100644
> --- a/drivers/media/platform/qcom/venus/core.h
> +++ b/drivers/media/platform/qcom/venus/core.h
> @@ -85,6 +85,10 @@ struct venus_caps {
> bool valid;
> };
>
> +struct video_firmware {
> + struct device *dev;
> + struct iommu_domain *iommu_domain;
> +};
> /**
> * struct venus_core - holds core parameters valid for all instances
> *
> @@ -129,6 +133,7 @@ struct venus_core {
> struct device *dev;
> struct device *dev_dec;
> struct device *dev_enc;
> + struct video_firmware fw;
> struct mutex lock;
> struct list_head instances;
> atomic_t insts_count;
> diff --git a/drivers/media/platform/qcom/venus/firmware.c b/drivers/media/platform/qcom/venus/firmware.c
> index cb7f48ef..058d544 100644
> --- a/drivers/media/platform/qcom/venus/firmware.c
> +++ b/drivers/media/platform/qcom/venus/firmware.c
> @@ -12,8 +12,10 @@
> *
> */
>
> +#include <linux/platform_device.h>
> #include <linux/device.h>
> #include <linux/firmware.h>
> +#include <linux/iommu.h>
> #include <linux/delay.h>
> #include <linux/kernel.h>
> #include <linux/io.h>
> @@ -27,9 +29,6 @@
> #include "firmware.h"
> #include "hfi_venus_io.h"
>
> -#define VENUS_PAS_ID 9
> -#define VENUS_FW_MEM_SIZE (6 * SZ_1M)
> -
> static void venus_reset_hw(struct venus_core *core)
> {
> void __iomem *reg_base = core->base;
> @@ -125,7 +124,7 @@ static int venus_load_fw(struct device *dev, const char *fwname,
> }
> if (qcom_scm_is_available())
> ret = qcom_mdt_load(dev, mdt, fwname, VENUS_PAS_ID, mem_va,
> - *mem_phys, *mem_size, NULL);
> + *mem_phys, *mem_size);
> else
> ret = qcom_mdt_load_no_init(dev, mdt, fwname, VENUS_PAS_ID,
> mem_va, *mem_phys, *mem_size, NULL);
> @@ -136,6 +135,77 @@ static int venus_load_fw(struct device *dev, const char *fwname,
> memunmap(mem_va);
> return ret;
> }
> +
> +int venus_boot_noTZ(struct venus_core *core, phys_addr_t mem_phys,

I'm not super enthusiastic about the capital letters, but I know what you're
going for so if everybody else is cool with it, I can be too.

> + size_t mem_size)
> +{
> + struct iommu_domain *iommu;
> + struct device *dev;
> + int ret;
> +
> + if (!core->fw.dev)
> + return -EPROBE_DEFER;
> +
> + dev = core->fw.dev;
> +
> + iommu = iommu_domain_alloc(&platform_bus_type);
> + if (!iommu) {
> + dev_err(dev, "Failed to allocate iommu domain\n");
> + return -ENOMEM;
> + }
> +
> + ret = iommu_attach_device(iommu, dev);
> + if (ret) {
> + dev_err(dev, "could not attach device\n");

Should be "could not attach device to iommu", so you know what part of the code you
are in.

> + goto err_attach;
> + }
> +
> + ret = iommu_map(iommu, VENUS_FW_START_ADDR, mem_phys, mem_size,
> + IOMMU_READ|IOMMU_WRITE|IOMMU_PRIV);

Do you really want to be mapping your firmware memory as IOMMU_WRITE?

> + if (ret) {
> + dev_err(dev, "could not map video firmware region\n");
> + goto err_map;
> + }
> + core->fw.iommu_domain = iommu;
> + venus_reset_hw(core);
> +
> + return 0;
> +
> +err_map:
> + iommu_detach_device(iommu, dev);
> +err_attach:
> + iommu_domain_free(iommu);
> + return ret;
> +}
> +
> +int venus_shutdown_noTZ(struct venus_core *core)
> +{
> + struct iommu_domain *iommu;
> + size_t unmapped = 0;
> + u32 reg;
> + struct device *dev = core->fw.dev;
> + void __iomem *reg_base = core->base;
> +
> + /* Assert the reset to ARM9 */
> + reg = readl_relaxed(reg_base + WRAPPER_A9SS_SW_RESET);
> + reg |= BIT(4);
> + writel_relaxed(reg, reg_base + WRAPPER_A9SS_SW_RESET);

You could just use core->base directly in both these cases and not bother with
the local variable.

> +
> + /* Make sure reset is asserted before the mapping is removed */
> + mb();
> +
> + iommu = core->fw.iommu_domain;
> +
> + unmapped = iommu_unmap(iommu, VENUS_FW_START_ADDR, VENUS_FW_MEM_SIZE);
> + if (unmapped != VENUS_FW_MEM_SIZE)
> + dev_err(dev, "failed to unmap firmware\n");
> +
> + iommu_detach_device(iommu, dev);
> + iommu_domain_free(iommu);
> +
> + return 0;
> +}
> +
> int venus_boot(struct venus_core *core)
> {
> phys_addr_t mem_phys;
> @@ -156,16 +226,20 @@ int venus_boot(struct venus_core *core)
>
> if (qcom_scm_is_available())
> ret = qcom_scm_pas_auth_and_reset(VENUS_PAS_ID);
> + else
> + ret = venus_boot_noTZ(core, mem_phys, mem_size);
>
> return ret;
> }
> -EXPORT_SYMBOL_GPL(venus_boot);
>
> -int venus_shutdown(struct device *dev)
> +int venus_shutdown(struct venus_core *core)
> {
> int ret = 0;
>
> if (qcom_scm_is_available())
> ret = qcom_scm_pas_shutdown(VENUS_PAS_ID);
> + else
> + ret = venus_shutdown_noTZ(core);
> +
> return ret;
> }
> diff --git a/drivers/media/platform/qcom/venus/firmware.h b/drivers/media/platform/qcom/venus/firmware.h
> index 0916826..67fdd89 100644
> --- a/drivers/media/platform/qcom/venus/firmware.h
> +++ b/drivers/media/platform/qcom/venus/firmware.h
> @@ -14,10 +14,15 @@
> #ifndef __VENUS_FIRMWARE_H__
> #define __VENUS_FIRMWARE_H__
>
> +#define VENUS_PAS_ID 9
> +#define VENUS_FW_START_ADDR 0x0
> +#define VENUS_FW_MEM_SIZE (6 * SZ_1M)
> +#define VENUS_MAX_MEM_REGION 0xE0000000
> +
> struct device;
>
> int venus_boot(struct venus_core *core);
> -int venus_shutdown(struct device *dev);
> +int venus_shutdown(struct venus_core *core);
> int venus_set_hw_state(enum tzbsp_video_state, struct venus_core *core);
>
> #endif

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