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Date:   Tue, 16 Aug 2022 14:45:21 +0300
From:   Mika Westerberg <mika.westerberg@linux.intel.com>
To:     Szuying Chen <chensiying21@gmail.com>
Cc:     gregkh@linuxfoundation.org, mario.limonciello@amd.com,
        andreas.noever@gmail.com, michael.jamet@intel.com,
        YehezkelShB@gmail.com, linux-usb@vger.kernel.org,
        linux-kernel@vger.kernel.org, Yd_Tseng@asmedia.com.tw,
        Chloe_Chen@asmedia.com.tw, Richard_Hsu@asmedia.com.tw
Subject: Re: [PATCH v4] thunderbolt: thunderbolt: add vendor's NVM formats
Message-ID: <YvuDUWv6U797j3x0@black.fi.intel.com>
References: <20220816105502.9059-1-chensiying21@gmail.com>
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In-Reply-To: <20220816105502.9059-1-chensiying21@gmail.com>
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Hi,

On Tue, Aug 16, 2022 at 06:55:02PM +0800, Szuying Chen wrote:
> From: Szuying Chen <Chloe_Chen@asmedia.com.tw>
> 
> The patch add tb_nvm_validate() contain an array that has functions
> pointers to asmedia_nvm_validate().
> And asmedia_nvm_validate() that recognize supported vendor works in one
> of the following cases:
> Case NVM_UPGRADE: enable nvm's attribute by setting no_nvm_upgrade
> flag to create nvm_authenticate file node.
> Case NVM_ADD: add active/non-active NVM devices.
> Case NVM_WRITE: update firmware to non-ative NVM device.
> 
> Signed-off-by: Szuying Chen <Chloe_Chen@asmedia.com.tw>
> ---Add enum nvm_validate_ops and modify ASMedia NVM Version format.
> ---Repair file(switch.c) has existed warning, but have 7 warn not fixed.
> 
> Note: The three previous submissions accidentally used the same subject
> prefix. This changelog is relative to the most recent submission at
> https://github.com/intel-lab-lkp/linux/commits/Szuying-Chen/thunderbolt-thunderbolt-add-vendor-s-NVM-formats/20220815-121330
> 
>  drivers/thunderbolt/nvm.c    | 148 +++++++++++++++++++++++++++++++++++
>  drivers/thunderbolt/switch.c |  28 ++++++-
>  drivers/thunderbolt/tb.h     |  23 ++++++
>  3 files changed, 196 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/thunderbolt/nvm.c b/drivers/thunderbolt/nvm.c
> index b3f310389378..be8cbcfafb80 100644
> --- a/drivers/thunderbolt/nvm.c
> +++ b/drivers/thunderbolt/nvm.c
> @@ -9,11 +9,159 @@
>  #include <linux/idr.h>
>  #include <linux/slab.h>
>  #include <linux/vmalloc.h>
> +#include <linux/pm_runtime.h>
> 
>  #include "tb.h"
> 
>  static DEFINE_IDA(nvm_ida);
> 
> +static int tb_switch_nvm_read(void *priv, unsigned int offset, void *val,
> +			      size_t bytes)
> +{
> +	struct tb_nvm *nvm = priv;
> +	struct tb_switch *sw = tb_to_switch(nvm->dev);
> +	int ret;
> +
> +	pm_runtime_get_sync(&sw->dev);
> +	if (!mutex_trylock(&sw->tb->lock)) {
> +		ret = restart_syscall();
> +		goto out;
> +	}
> +	ret = usb4_switch_nvm_read(sw, offset, val, bytes);
> +	mutex_unlock(&sw->tb->lock);
> +
> +out:
> +	pm_runtime_mark_last_busy(&sw->dev);
> +	pm_runtime_put_autosuspend(&sw->dev);
> +
> +	return ret;
> +}
> +
> +static int tb_switch_nvm_write(void *priv, unsigned int offset, void *val,
> +			       size_t bytes)
> +{
> +	struct tb_nvm *nvm = priv;
> +	struct tb_switch *sw = tb_to_switch(nvm->dev);
> +	int ret;
> +
> +	if (!mutex_trylock(&sw->tb->lock))
> +		return restart_syscall();
> +
> +	/*
> +	 * Since writing the NVM image might require some special steps,
> +	 * for example when CSS headers are written, we cache the image
> +	 * locally here and handle the special cases when the user asks
> +	 * us to authenticate the image.
> +	 */
> +	ret = tb_nvm_write_buf(nvm, offset, val, bytes);
> +	mutex_unlock(&sw->tb->lock);
> +
> +	return ret;
> +}
> +
> +static int asmedia_nvm_validate(struct tb_switch *sw, unsigned int mode)
> +{
> +	struct tb_nvm *nvm;
> +	u32 val;
> +	u32 nvm_size;
> +	int ret = 0;
> +	unsigned int image_size;
> +
> +	switch (mode) {
> +	case NVM_UPGRADE:
> +		if (sw->no_nvm_upgrade)
> +			sw->no_nvm_upgrade = false;
> +
> +		break;
> +
> +	case NVM_ADD:
> +		nvm = tb_nvm_alloc(&sw->dev);

This function does not only "validate" but it also creates the NVMem
devices and whatnot.

Do you have some public description of the ASMedia format that I could
take a look? Perhaps we can find some simpler way of validating the
thing that works accross different vendors.

> +		if (IS_ERR(nvm)) {
> +			ret = PTR_ERR(nvm);
> +			break;
> +		}
> +
> +		ret = usb4_switch_nvm_read(sw, ASMEDIA_NVM_VERSION, &val, sizeof(val));
> +		if (ret)
> +			break;
> +
> +		nvm->nvm_asm.major = (((u8)val) << 0x10 | ((u8)(val >> 0x8)) << 0x8 | (u8)(val >> 0x10));
> +		ret = usb4_switch_nvm_read(sw, ASMEDIA_NVM_DATE, &val, sizeof(val));
> +		if (ret)
> +			break;
> +
> +		nvm->nvm_asm.minor = (((u8)val) << 0x10 | ((u8)(val >> 0x8)) << 0x8 | (u8)(val >> 0x10));
> +		nvm_size = SZ_512K;
> +		ret = tb_nvm_add_active(nvm, nvm_size, tb_switch_nvm_read);
> +		if (ret)
> +			break;
> +
> +		ret = tb_nvm_add_non_active(nvm, NVM_MAX_SIZE, tb_switch_nvm_write);
> +		if (ret)
> +			break;
> +
> +		sw->nvm = nvm;
> +		break;
> +
> +	case NVM_WRITE:
> +		const u8 *buf = sw->nvm->buf;
> +
> +		if (!buf) {
> +			ret = -EINVAL;
> +			break;
> +		}
> +		image_size = sw->nvm->buf_data_size;
> +		if (image_size < NVM_MIN_SIZE || image_size > NVM_MAX_SIZE) {
> +			ret = -EINVAL;
> +			break;
> +		}
> +		ret = usb4_switch_nvm_write(sw, 0, buf, image_size);
> +		if (!ret)
> +			sw->nvm->flushed = true;
> +
> +		break;
> +
> +	default:
> +		break;
> +	}
> +
> +	if ((mode == NVM_ADD) && (ret != 0))
> +		tb_nvm_free(sw->nvm);
> +
> +	return ret;
> +}
> +
> +struct tb_nvm_id {
> +	u16 hw_vendor_id;
> +	int (*validate)(struct tb_switch *sw, unsigned int mode);
> +};
> +
> +static const struct tb_nvm_id tb_nvm_vendors[] = {
> +	/* ASMedia software CM firmware upgrade */
> +	{ 0x174c, asmedia_nvm_validate },
> +};
> +
> +/**
> + * tb_nvm_vendor_handle() - support vendor's NVM format
> + * @sw: Thunderbolt switch
> + * @handle: 0:NvmUpgradeSuppport, 1:NvmAdd, 2:NvmWrite
> + */
> +int tb_nvm_validate(struct tb_switch *sw, unsigned int mode)
> +{
> +	int i;
> +	int res = 0;
> +
> +	for (i = 0; i < ARRAY_SIZE(tb_nvm_vendors); i++) {
> +		const struct tb_nvm_id *id = &tb_nvm_vendors[i];
> +
> +		if (id->hw_vendor_id && id->hw_vendor_id != sw->config.vendor_id)
> +			continue;
> +
> +		 res = id->validate(sw, mode);
> +	}
> +	return res;
> +}
> +
>  /**
>   * tb_nvm_alloc() - Allocate new NVM structure
>   * @dev: Device owning the NVM
> diff --git a/drivers/thunderbolt/switch.c b/drivers/thunderbolt/switch.c
> index 244f8cd38b25..de380fb5a166 100644
> --- a/drivers/thunderbolt/switch.c
> +++ b/drivers/thunderbolt/switch.c
> @@ -114,6 +114,14 @@ static int nvm_validate_and_write(struct tb_switch *sw)
>  	if (image_size < NVM_MIN_SIZE || image_size > NVM_MAX_SIZE)
>  		return -EINVAL;
> 
> +	/*
> +	 * Vendor's nvm write. If the image has been flushed to the
> +	 * storage are, nvm write is complete.
> +	 */
> +	ret = tb_nvm_validate(sw, NVM_WRITE);
> +	if (sw->nvm->flushed)
> +		return ret;
> +
>  	/*
>  	 * FARB pointer must point inside the image and must at least
>  	 * contain parts of the digital section we will be reading here.
> @@ -391,10 +399,14 @@ static int tb_switch_nvm_add(struct tb_switch *sw)
>  		return 0;
> 
>  	/*
> -	 * The NVM format of non-Intel hardware is not known so
> -	 * currently restrict NVM upgrade for Intel hardware. We may
> -	 * relax this in the future when we learn other NVM formats.
> +	 * The NVM format of Intel and Asmedia hardware are known so
> +	 * currently restrict NVM upgrade for Intel and Asmedia hardware.
> +	 * We may relax this in the future when we learn other NVM formats.
>  	 */
> +	ret = tb_nvm_validate(sw, NVM_ADD);
> +	if (ret)
> +		return ret;
> +
>  	if (sw->config.vendor_id != PCI_VENDOR_ID_INTEL &&
>  	    sw->config.vendor_id != 0x8087) {
>  		dev_info(&sw->dev,
> @@ -527,6 +539,7 @@ int tb_port_state(struct tb_port *port)
>  {
>  	struct tb_cap_phy phy;
>  	int res;
> +
>  	if (port->cap_phy == 0) {
>  		tb_port_WARN(port, "does not have a PHY\n");
>  		return -EINVAL;
> @@ -556,6 +569,7 @@ int tb_wait_for_port(struct tb_port *port, bool wait_if_unplugged)
>  {
>  	int retries = 10;
>  	int state;
> +
>  	if (!port->cap_phy) {
>  		tb_port_WARN(port, "does not have PHY\n");
>  		return -EINVAL;
> @@ -653,6 +667,7 @@ int tb_port_add_nfc_credits(struct tb_port *port, int credits)
>  int tb_port_clear_counter(struct tb_port *port, int counter)
>  {
>  	u32 zero[3] = { 0, 0, 0 };
> +
>  	tb_port_dbg(port, "clearing counter %d\n", counter);
>  	return tb_port_write(port, zero, TB_CFG_COUNTERS, 3 * counter, 3);
>  }
> @@ -875,6 +890,7 @@ static inline bool tb_switch_is_reachable(const struct tb_switch *parent,
>  					  const struct tb_switch *sw)
>  {
>  	u64 mask = (1ULL << parent->config.depth * 8) - 1;
> +
>  	return (tb_route(parent) & mask) == (tb_route(sw) & mask);
>  }
> 
> @@ -1345,6 +1361,7 @@ bool tb_pci_port_is_enabled(struct tb_port *port)
>  int tb_pci_port_enable(struct tb_port *port, bool enable)
>  {
>  	u32 word = enable ? ADP_PCIE_CS_0_PE : 0x0;
> +
>  	if (!port->cap_adap)
>  		return -ENXIO;
>  	return tb_port_write(port, &word, TB_CFG_PORT,
> @@ -1918,6 +1935,7 @@ static ssize_t nvm_authenticate_store(struct device *dev,
>  	struct device_attribute *attr, const char *buf, size_t count)
>  {
>  	int ret = nvm_authenticate_sysfs(dev, buf, false);
> +
>  	if (ret)
>  		return ret;
>  	return count;
> @@ -1953,6 +1971,9 @@ static ssize_t nvm_version_show(struct device *dev,
>  		ret = -ENODATA;
>  	else if (!sw->nvm)
>  		ret = -EAGAIN;
> +	/*ASMedia NVM version show format xxxxxx_xxxxxx */
> +	else if (sw->config.vendor_id == 0x174C)
> +		ret = sprintf(buf, "%06x.%06x\n", sw->nvm->nvm_asm.major, sw->nvm->nvm_asm.minor);

And yes, we can make the nvm->major/minor to be 32-bit integers too for
both Intel and ASMedia and continue to use the %x.%x formatting.

>  	else
>  		ret = sprintf(buf, "%x.%x\n", sw->nvm->major, sw->nvm->minor);
> 
> @@ -2860,6 +2881,7 @@ int tb_switch_add(struct tb_switch *sw)
>  		tb_sw_dbg(sw, "uid: %#llx\n", sw->uid);
> 
>  		tb_check_quirks(sw);
> +		tb_nvm_validate(sw, NVM_UPGRADE);
> 
>  		ret = tb_switch_set_uuid(sw);
>  		if (ret) {
> diff --git a/drivers/thunderbolt/tb.h b/drivers/thunderbolt/tb.h
> index 5db76de40cc1..7f5c8ae731a0 100644
> --- a/drivers/thunderbolt/tb.h
> +++ b/drivers/thunderbolt/tb.h
> @@ -28,6 +28,15 @@
>  #define NVM_VERSION		0x08
>  #define NVM_FLASH_SIZE		0x45
> 
> +/* ASMedia specific NVM offsets */
> +#define ASMEDIA_NVM_VERSION	0x28
> +#define ASMEDIA_NVM_DATE	0x1c

Didn't I already commented about these? Are my emails somehow lost or
they just get ignored?

> +struct nvm_asmedia {
> +	u32 major;
> +	u32 minor;
> +};
> +
>  /**
>   * struct tb_nvm - Structure holding NVM information
>   * @dev: Owner of the NVM
> @@ -57,6 +66,7 @@ struct tb_nvm {
>  	size_t buf_data_size;
>  	bool authenticating;
>  	bool flushed;
> +	struct nvm_asmedia nvm_asm;
>  };
> 
>  enum tb_nvm_write_ops {
> @@ -65,6 +75,18 @@ enum tb_nvm_write_ops {
>  	AUTHENTICATE_ONLY = 3,
>  };
> 
> +/*
> + * enum nvm_validate_ops - Nvm upgrade for each vendor
> + * @NVM_UPGRADE: Not prevent NVM upgrade.
> + * @NVM_ADD: Vendor's NVM device add.
> + * @NVM_WRITE: Vendor's NVM write.
> + */
> +enum nvm_validate_ops {
> +	NVM_UPGRADE = 0,
> +	NVM_ADD = 1,
> +	NVM_WRITE = 2,
> +};
> +
>  #define TB_SWITCH_KEY_SIZE		32
>  #define TB_SWITCH_MAX_DEPTH		6
>  #define USB4_SWITCH_MAX_DEPTH		5
> @@ -736,6 +758,7 @@ static inline void tb_domain_put(struct tb *tb)
>  	put_device(&tb->dev);
>  }
> 
> +int tb_nvm_validate(struct tb_switch *sw, unsigned int mode);
>  struct tb_nvm *tb_nvm_alloc(struct device *dev);
>  int tb_nvm_add_active(struct tb_nvm *nvm, size_t size, nvmem_reg_read_t reg_read);
>  int tb_nvm_write_buf(struct tb_nvm *nvm, unsigned int offset, void *val,
> --
> 2.34.1