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SubjectRe: [PATCH v4] thunderbolt: thunderbolt: add vendor's NVM formats
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

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