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Date: Fri, 24 Aug 2018 16:39:06 +0900
From: Alexandre Courbot <acourbot@...omium.org>
To: vgarodia@...eaurora.org
Cc: Stanimir Varbanov <stanimir.varbanov@...aro.org>,
Hans Verkuil <hverkuil@...all.nl>,
Mauro Carvalho Chehab <mchehab@...nel.org>, robh@...nel.org,
mark.rutland@....com, Andy Gross <andy.gross@...aro.org>,
Arnd Bergmann <arnd@...db.de>, bjorn.andersson@...aro.org,
Linux Media Mailing List <linux-media@...r.kernel.org>,
LKML <linux-kernel@...r.kernel.org>,
linux-arm-msm@...r.kernel.org, linux-soc@...r.kernel.org,
devicetree@...r.kernel.org
Subject: Re: [PATCH v6 3/4] venus: firmware: add no TZ boot and shutdown routine
On Thu, Aug 23, 2018 at 11:29 PM Vikash Garodia <vgarodia@...eaurora.org> 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@...eaurora.org>
> ---
> drivers/media/platform/qcom/venus/core.c | 6 +-
> drivers/media/platform/qcom/venus/core.h | 7 ++
> drivers/media/platform/qcom/venus/firmware.c | 90 +++++++++++++++++++++++-
> drivers/media/platform/qcom/venus/firmware.h | 2 +-
> drivers/media/platform/qcom/venus/hfi_venus_io.h | 1 +
> 5 files changed, 99 insertions(+), 7 deletions(-)
>
> diff --git a/drivers/media/platform/qcom/venus/core.c b/drivers/media/platform/qcom/venus/core.c
> index 75b9785..393994e 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);
>
> @@ -323,7 +323,7 @@ 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);
> @@ -344,7 +344,7 @@ 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 dfd5c10..b2cb359 100644
> --- a/drivers/media/platform/qcom/venus/core.h
> +++ b/drivers/media/platform/qcom/venus/core.h
> @@ -81,6 +81,11 @@ struct venus_caps {
> bool valid; /* used only for Venus v1xx */
> };
>
> +struct video_firmware {
> + struct device *dev;
> + struct iommu_domain *iommu_domain;
> +};
> +
> /**
> * struct venus_core - holds core parameters valid for all instances
> *
> @@ -98,6 +103,7 @@ struct venus_caps {
> * @dev: convenience struct device pointer
> * @dev_dec: convenience struct device pointer for decoder device
> * @dev_enc: convenience struct device pointer for encoder device
> + * @fw: a struct for venus firmware info
> * @no_tz: a flag that suggests presence of trustzone
> * @lock: a lock for this strucure
> * @instances: a list_head of all instances
> @@ -130,6 +136,7 @@ struct venus_core {
> struct device *dev;
> struct device *dev_dec;
> struct device *dev_enc;
> + struct video_firmware fw;
Since struct video_firmware is only used here I think you can declare
it inline, i.e.
struct {
struct device *dev;
struct iommu_domain *iommu_domain;
} fw;
This structure is actually a good candidate to hold the firmware
memory area start address and size.
> bool no_tz;
> struct mutex lock;
> struct list_head instances;
> diff --git a/drivers/media/platform/qcom/venus/firmware.c b/drivers/media/platform/qcom/venus/firmware.c
> index 34224eb..79b3858 100644
> --- a/drivers/media/platform/qcom/venus/firmware.c
> +++ b/drivers/media/platform/qcom/venus/firmware.c
> @@ -15,9 +15,11 @@
> #include <linux/device.h>
> #include <linux/firmware.h>
> #include <linux/kernel.h>
> +#include <linux/iommu.h>
> #include <linux/io.h>
> #include <linux/of.h>
> #include <linux/of_address.h>
> +#include <linux/platform_device.h>
> #include <linux/qcom_scm.h>
> #include <linux/sizes.h>
> #include <linux/soc/qcom/mdt_loader.h>
> @@ -120,6 +122,76 @@ static int venus_load_fw(struct venus_core *core, const char *fwname,
> return ret;
> }
>
> +static int venus_boot_no_tz(struct venus_core *core, phys_addr_t mem_phys,
> + size_t mem_size)
After moving the firmware address and size into venus_core you won't
need the last two arguments.
> +{
> + struct iommu_domain *iommu_dom;
> + struct device *dev;
> + int ret;
> +
> + dev = core->fw.dev;
> + if (!dev)
> + return -EPROBE_DEFER;
> +
> + iommu_dom = iommu_domain_alloc(&platform_bus_type);
> + if (!iommu_dom) {
> + dev_err(dev, "Failed to allocate iommu domain\n");
> + return -ENOMEM;
> + }
> +
> + ret = iommu_attach_device(iommu_dom, dev);
> + if (ret) {
> + dev_err(dev, "could not attach device\n");
> + goto err_attach;
> + }
I think like the above belongs more in venus_firmware_init()
(introduced in patch 4/4) than here. There is no reason to
detach/reattach the iommu if we stop the firmware.
> +
> + ret = iommu_map(iommu_dom, VENUS_FW_START_ADDR, mem_phys, mem_size,
> + IOMMU_READ | IOMMU_WRITE | IOMMU_PRIV);
> + if (ret) {
> + dev_err(dev, "could not map video firmware region\n");
> + goto err_map;
> + }
Maybe this too?
> +
> + core->fw.iommu_domain = iommu_dom;
> + venus_reset_cpu(core);
> +
> + return 0;
> +
> +err_map:
> + iommu_detach_device(iommu_dom, dev);
> +err_attach:
> + iommu_domain_free(iommu_dom);
> + return ret;
> +}
> +
> +static int venus_shutdown_no_tz(struct venus_core *core)
> +{
> + struct iommu_domain *iommu;
> + size_t unmapped;
> + u32 reg;
> + struct device *dev = core->fw.dev;
> + void __iomem *base = core->base;
> +
> + /* Assert the reset to ARM9 */
> + reg = readl_relaxed(base + WRAPPER_A9SS_SW_RESET);
> + reg |= WRAPPER_A9SS_SW_RESET_BIT;
> + writel_relaxed(reg, base + WRAPPER_A9SS_SW_RESET);
> +
> + /* 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);
Accordingly, this would also be moved into venus_firmware_deinit().
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