Re: [PATCH v2 10/21] ipmi: kcs_bmc: Turn the driver data-structures inside-out

From: Zev Weiss
Date: Fri Apr 09 2021 - 00:36:27 EST

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On Fri, Mar 19, 2021 at 01:27:41AM CDT, Andrew Jeffery wrote:
>Make the KCS device drivers responsible for allocating their own memory.
>
>Until now the private data for the device driver was allocated internal
>to the private data for the chardev interface. This coupling required
>the slightly awkward API of passing through the struct size for the
>driver private data to the chardev constructor, and then retrieving a
>pointer to the driver private data from the allocated chardev memory.
>
>In addition to being awkward, the arrangement prevents the
>implementation of alternative userspace interfaces as the device driver
>private data is not independent.
>
>Peel a layer off the onion and turn the data-structures inside out by
>exploiting container_of() and embedding `struct kcs_device` in the
>driver private data.
>
>Signed-off-by: Andrew Jeffery <andrew@xxxxxxxx>
>---
> drivers/char/ipmi/kcs_bmc.c | 15 +++++--
> drivers/char/ipmi/kcs_bmc.h | 12 ++----
> drivers/char/ipmi/kcs_bmc_aspeed.c | 60 ++++++++++++++++-----------
> drivers/char/ipmi/kcs_bmc_cdev_ipmi.c | 60 ++++++++++++++++++---------
> drivers/char/ipmi/kcs_bmc_npcm7xx.c | 37 ++++++++++-------
> 5 files changed, 113 insertions(+), 71 deletions(-)
>
>diff --git a/drivers/char/ipmi/kcs_bmc.c b/drivers/char/ipmi/kcs_bmc.c
>index ef5c48ffe74a..709b6bdec165 100644
>--- a/drivers/char/ipmi/kcs_bmc.c
>+++ b/drivers/char/ipmi/kcs_bmc.c
>@@ -44,12 +44,19 @@ int kcs_bmc_handle_event(struct kcs_bmc *kcs_bmc)
> }
> EXPORT_SYMBOL(kcs_bmc_handle_event);
>
>-struct kcs_bmc *kcs_bmc_ipmi_alloc(struct device *dev, int sizeof_priv, u32 channel);
>-struct kcs_bmc *kcs_bmc_alloc(struct device *dev, int sizeof_priv, u32 channel)
>+int kcs_bmc_ipmi_attach_cdev(struct kcs_bmc *kcs_bmc);

Another declaration perhaps intended for kcs_bmc.h?

>+int kcs_bmc_add_device(struct kcs_bmc *kcs_bmc)
> {
>- return kcs_bmc_ipmi_alloc(dev, sizeof_priv, channel);
>+ return kcs_bmc_ipmi_attach_cdev(kcs_bmc);
> }
>-EXPORT_SYMBOL(kcs_bmc_alloc);
>+EXPORT_SYMBOL(kcs_bmc_add_device);
>+
>+int kcs_bmc_ipmi_detach_cdev(struct kcs_bmc *kcs_bmc);

Here too.

>+int kcs_bmc_remove_device(struct kcs_bmc *kcs_bmc)
>+{
>+ return kcs_bmc_ipmi_detach_cdev(kcs_bmc);
>+}
>+EXPORT_SYMBOL(kcs_bmc_remove_device);
>
> MODULE_LICENSE("GPL v2");
> MODULE_AUTHOR("Haiyue Wang <haiyue.wang@xxxxxxxxxxxxxxx>");
>diff --git a/drivers/char/ipmi/kcs_bmc.h b/drivers/char/ipmi/kcs_bmc.h
>index febea0c8deb4..bf0ae327997f 100644
>--- a/drivers/char/ipmi/kcs_bmc.h
>+++ b/drivers/char/ipmi/kcs_bmc.h
>@@ -67,6 +67,8 @@ struct kcs_ioreg {
> };
>
> struct kcs_bmc {
>+ struct device *dev;
>+
> spinlock_t lock;
>
> u32 channel;
>@@ -94,17 +96,11 @@ struct kcs_bmc {
> u8 *kbuffer;
>
> struct miscdevice miscdev;
>-
>- unsigned long priv[];
> };
>
>-static inline void *kcs_bmc_priv(struct kcs_bmc *kcs_bmc)
>-{
>- return kcs_bmc->priv;
>-}
>-
> int kcs_bmc_handle_event(struct kcs_bmc *kcs_bmc);
>-struct kcs_bmc *kcs_bmc_alloc(struct device *dev, int sizeof_priv, u32 channel);
>+int kcs_bmc_add_device(struct kcs_bmc *kcs_bmc);
>+int kcs_bmc_remove_device(struct kcs_bmc *kcs_bmc);
>
> u8 kcs_bmc_read_data(struct kcs_bmc *kcs_bmc);
> void kcs_bmc_write_data(struct kcs_bmc *kcs_bmc, u8 data);
>diff --git a/drivers/char/ipmi/kcs_bmc_aspeed.c b/drivers/char/ipmi/kcs_bmc_aspeed.c
>index 630cf095560e..0416ac78ce68 100644
>--- a/drivers/char/ipmi/kcs_bmc_aspeed.c
>+++ b/drivers/char/ipmi/kcs_bmc_aspeed.c
>@@ -61,6 +61,8 @@
> #define LPC_STR4 0x11C
>
> struct aspeed_kcs_bmc {
>+ struct kcs_bmc kcs_bmc;
>+
> struct regmap *map;
> };
>
>@@ -69,9 +71,14 @@ struct aspeed_kcs_of_ops {
> int (*get_io_address)(struct platform_device *pdev);
> };
>
>+static inline struct aspeed_kcs_bmc *to_aspeed_kcs_bmc(struct kcs_bmc *kcs_bmc)
>+{
>+ return container_of(kcs_bmc, struct aspeed_kcs_bmc, kcs_bmc);
>+}
>+
> static u8 aspeed_kcs_inb(struct kcs_bmc *kcs_bmc, u32 reg)
> {
>- struct aspeed_kcs_bmc *priv = kcs_bmc_priv(kcs_bmc);
>+ struct aspeed_kcs_bmc *priv = to_aspeed_kcs_bmc(kcs_bmc);
> u32 val = 0;
> int rc;
>
>@@ -83,7 +90,7 @@ static u8 aspeed_kcs_inb(struct kcs_bmc *kcs_bmc, u32 reg)
>
> static void aspeed_kcs_outb(struct kcs_bmc *kcs_bmc, u32 reg, u8 data)
> {
>- struct aspeed_kcs_bmc *priv = kcs_bmc_priv(kcs_bmc);
>+ struct aspeed_kcs_bmc *priv = to_aspeed_kcs_bmc(kcs_bmc);
> int rc;
>
> rc = regmap_write(priv->map, reg, data);
>@@ -92,7 +99,7 @@ static void aspeed_kcs_outb(struct kcs_bmc *kcs_bmc, u32 reg, u8 data)
>
> static void aspeed_kcs_updateb(struct kcs_bmc *kcs_bmc, u32 reg, u8 mask, u8 val)
> {
>- struct aspeed_kcs_bmc *priv = kcs_bmc_priv(kcs_bmc);
>+ struct aspeed_kcs_bmc *priv = to_aspeed_kcs_bmc(kcs_bmc);
> int rc;
>
> rc = regmap_update_bits(priv->map, reg, mask, val);
>@@ -114,7 +121,7 @@ static void aspeed_kcs_updateb(struct kcs_bmc *kcs_bmc, u32 reg, u8 mask, u8 val
> */
> static void aspeed_kcs_set_address(struct kcs_bmc *kcs_bmc, u16 addr)
> {
>- struct aspeed_kcs_bmc *priv = kcs_bmc_priv(kcs_bmc);
>+ struct aspeed_kcs_bmc *priv = to_aspeed_kcs_bmc(kcs_bmc);
>
> switch (kcs_bmc->channel) {
> case 1:
>@@ -148,7 +155,7 @@ static void aspeed_kcs_set_address(struct kcs_bmc *kcs_bmc, u16 addr)
>
> static void aspeed_kcs_enable_channel(struct kcs_bmc *kcs_bmc, bool enable)
> {
>- struct aspeed_kcs_bmc *priv = kcs_bmc_priv(kcs_bmc);
>+ struct aspeed_kcs_bmc *priv = to_aspeed_kcs_bmc(kcs_bmc);
>
> switch (kcs_bmc->channel) {
> case 1:
>@@ -323,16 +330,16 @@ static int aspeed_kcs_of_v2_get_io_address(struct platform_device *pdev)
> static int aspeed_kcs_probe(struct platform_device *pdev)
> {
> const struct aspeed_kcs_of_ops *ops;
>- struct device *dev = &pdev->dev;
>+ struct aspeed_kcs_bmc *priv;
> struct kcs_bmc *kcs_bmc;
> struct device_node *np;
> int rc, channel, addr;
>
>- np = dev->of_node->parent;
>+ np = pdev->dev.of_node->parent;
> if (!of_device_is_compatible(np, "aspeed,ast2400-lpc-v2") &&
> !of_device_is_compatible(np, "aspeed,ast2500-lpc-v2") &&
> !of_device_is_compatible(np, "aspeed,ast2600-lpc-v2")) {
>- dev_err(dev, "unsupported LPC device binding\n");
>+ dev_err(&pdev->dev, "unsupported LPC device binding\n");
> return -ENODEV;
> }
> ops = of_device_get_match_data(&pdev->dev);
>@@ -343,18 +350,27 @@ static int aspeed_kcs_probe(struct platform_device *pdev)
> if (channel < 0)
> return channel;
>
>- kcs_bmc = kcs_bmc_alloc(&pdev->dev, sizeof(struct aspeed_kcs_bmc), channel);
>- if (!kcs_bmc)
>+ addr = ops->get_io_address(pdev);
>+ if (addr < 0)
>+ return addr;
>+
>+ priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
>+ if (!priv)
> return -ENOMEM;
>
>+ kcs_bmc = &priv->kcs_bmc;
>+ kcs_bmc->dev = &pdev->dev;
>+ kcs_bmc->channel = channel;
> kcs_bmc->ioreg = ast_kcs_bmc_ioregs[channel - 1];
> kcs_bmc->io_inputb = aspeed_kcs_inb;
> kcs_bmc->io_outputb = aspeed_kcs_outb;
> kcs_bmc->io_updateb = aspeed_kcs_updateb;
>
>- addr = ops->get_io_address(pdev);
>- if (addr < 0)
>- return addr;
>+ priv->map = syscon_node_to_regmap(pdev->dev.parent->of_node);
>+ if (IS_ERR(priv->map)) {
>+ dev_err(&pdev->dev, "Couldn't get regmap\n");
>+ return -ENODEV;
>+ }

The reanimated priv->map initialization I suspect wasn't meant to
have been removed in the first place...

>
> aspeed_kcs_set_address(kcs_bmc, addr);
>
>@@ -362,29 +378,25 @@ static int aspeed_kcs_probe(struct platform_device *pdev)
> if (rc)
> return rc;
>
>- dev_set_drvdata(dev, kcs_bmc);
>+ platform_set_drvdata(pdev, priv);
>
> aspeed_kcs_enable_channel(kcs_bmc, true);
>
>- rc = misc_register(&kcs_bmc->miscdev);
>- if (rc) {
>- dev_err(dev, "Unable to register device\n");
>+ rc = kcs_bmc_add_device(&priv->kcs_bmc);
>+ if (rc < 0)
> return rc;
>- }
>
>- dev_dbg(&pdev->dev,
>- "Probed KCS device %d (IDR=0x%x, ODR=0x%x, STR=0x%x)\n",
>- kcs_bmc->channel, kcs_bmc->ioreg.idr, kcs_bmc->ioreg.odr,
>- kcs_bmc->ioreg.str);
>+ dev_info(&pdev->dev, "Initialised channel %d at 0x%x\n", kcs_bmc->channel, addr);

Is the dbg->info change here intentional? (I have no particular
objection if so, but it's often a change I make myself during
testing/debugging and then forget to revert...)

>
> return 0;
> }
>
> static int aspeed_kcs_remove(struct platform_device *pdev)
> {
>- struct kcs_bmc *kcs_bmc = dev_get_drvdata(&pdev->dev);
>+ struct aspeed_kcs_bmc *priv = platform_get_drvdata(pdev);
>+ struct kcs_bmc *kcs_bmc = &priv->kcs_bmc;
>
>- misc_deregister(&kcs_bmc->miscdev);
>+ kcs_bmc_remove_device(kcs_bmc);

Should we propagate the return value outward here?

>
> return 0;
> }
>diff --git a/drivers/char/ipmi/kcs_bmc_cdev_ipmi.c b/drivers/char/ipmi/kcs_bmc_cdev_ipmi.c
>index 82c77994e481..0ca71c135a1a 100644
>--- a/drivers/char/ipmi/kcs_bmc_cdev_ipmi.c
>+++ b/drivers/char/ipmi/kcs_bmc_cdev_ipmi.c
>@@ -382,7 +382,7 @@ static int kcs_bmc_ipmi_release(struct inode *inode, struct file *filp)
> return 0;
> }
>
>-static const struct file_operations kcs_bmc_fops = {
>+static const struct file_operations kcs_bmc_ipmi_fops = {
> .owner = THIS_MODULE,
> .open = kcs_bmc_ipmi_open,
> .read = kcs_bmc_ipmi_read,
>@@ -392,36 +392,58 @@ static const struct file_operations kcs_bmc_fops = {
> .unlocked_ioctl = kcs_bmc_ipmi_ioctl,
> };
>
>-struct kcs_bmc *kcs_bmc_ipmi_alloc(struct device *dev, int sizeof_priv, u32 channel);
>-struct kcs_bmc *kcs_bmc_ipmi_alloc(struct device *dev, int sizeof_priv, u32 channel)
>+int kcs_bmc_ipmi_attach_cdev(struct kcs_bmc *kcs_bmc);

Errant declaration again?

>+int kcs_bmc_ipmi_attach_cdev(struct kcs_bmc *kcs_bmc)
> {
>- struct kcs_bmc *kcs_bmc;
>-
>- kcs_bmc = devm_kzalloc(dev, sizeof(*kcs_bmc) + sizeof_priv, GFP_KERNEL);
>- if (!kcs_bmc)
>- return NULL;
>+ int rc;
>
> spin_lock_init(&kcs_bmc->lock);
>- kcs_bmc->channel = channel;
>-
> mutex_init(&kcs_bmc->mutex);
> init_waitqueue_head(&kcs_bmc->queue);
>
>- kcs_bmc->data_in = devm_kmalloc(dev, KCS_MSG_BUFSIZ, GFP_KERNEL);
>- kcs_bmc->data_out = devm_kmalloc(dev, KCS_MSG_BUFSIZ, GFP_KERNEL);
>- kcs_bmc->kbuffer = devm_kmalloc(dev, KCS_MSG_BUFSIZ, GFP_KERNEL);
>+ kcs_bmc->data_in = devm_kmalloc(kcs_bmc->dev, KCS_MSG_BUFSIZ, GFP_KERNEL);
>+ kcs_bmc->data_out = devm_kmalloc(kcs_bmc->dev, KCS_MSG_BUFSIZ, GFP_KERNEL);
>+ kcs_bmc->kbuffer = devm_kmalloc(kcs_bmc->dev, KCS_MSG_BUFSIZ, GFP_KERNEL);
>
> kcs_bmc->miscdev.minor = MISC_DYNAMIC_MINOR;
>- kcs_bmc->miscdev.name = devm_kasprintf(dev, GFP_KERNEL, "%s%u",
>- DEVICE_NAME, channel);
>+ kcs_bmc->miscdev.name = devm_kasprintf(kcs_bmc->dev, GFP_KERNEL, "%s%u",
>+ DEVICE_NAME, kcs_bmc->channel);
> if (!kcs_bmc->data_in || !kcs_bmc->data_out || !kcs_bmc->kbuffer ||
> !kcs_bmc->miscdev.name)
>- return NULL;
>- kcs_bmc->miscdev.fops = &kcs_bmc_fops;
>+ return -ENOMEM;
>
>- return kcs_bmc;
>+ kcs_bmc->miscdev.fops = &kcs_bmc_ipmi_fops;
>+
>+ rc = misc_register(&kcs_bmc->miscdev);
>+ if (rc) {
>+ dev_err(kcs_bmc->dev, "Unable to register device: %d\n", rc);
>+ return rc;
>+ }
>+
>+ dev_info(kcs_bmc->dev, "Initialised IPMI client for channel %d", kcs_bmc->channel);
>+
>+ return 0;
>+}
>+EXPORT_SYMBOL(kcs_bmc_ipmi_attach_cdev);
>+
>+int kcs_bmc_ipmi_detach_cdev(struct kcs_bmc *kcs_bmc);

Same here.

>+int kcs_bmc_ipmi_detach_cdev(struct kcs_bmc *kcs_bmc)
>+{
>+ misc_deregister(&kcs_bmc->miscdev);
>+
>+ spin_lock_irq(&kcs_bmc->lock);
>+ kcs_bmc->running = 0;
>+ kcs_bmc_ipmi_force_abort(kcs_bmc);
>+ spin_unlock_irq(&kcs_bmc->lock);
>+
>+ devm_kfree(kcs_bmc->dev, kcs_bmc->kbuffer);
>+ devm_kfree(kcs_bmc->dev, kcs_bmc->data_out);
>+ devm_kfree(kcs_bmc->dev, kcs_bmc->data_in);
>+ devm_kfree(kcs_bmc->dev, kcs_bmc);
>+
>+ return 0;
> }
>-EXPORT_SYMBOL(kcs_bmc_ipmi_alloc);
>+EXPORT_SYMBOL(kcs_bmc_ipmi_detach_cdev);
>
> MODULE_LICENSE("GPL v2");
> MODULE_AUTHOR("Haiyue Wang <haiyue.wang@xxxxxxxxxxxxxxx>");
>diff --git a/drivers/char/ipmi/kcs_bmc_npcm7xx.c b/drivers/char/ipmi/kcs_bmc_npcm7xx.c
>index 1f44aadec9e8..5d017498dc69 100644
>--- a/drivers/char/ipmi/kcs_bmc_npcm7xx.c
>+++ b/drivers/char/ipmi/kcs_bmc_npcm7xx.c
>@@ -65,6 +65,8 @@ struct npcm7xx_kcs_reg {
> };
>
> struct npcm7xx_kcs_bmc {
>+ struct kcs_bmc kcs_bmc;
>+
> struct regmap *map;
>
> const struct npcm7xx_kcs_reg *reg;
>@@ -76,9 +78,14 @@ static const struct npcm7xx_kcs_reg npcm7xx_kcs_reg_tbl[KCS_CHANNEL_MAX] = {
> { .sts = KCS3ST, .dob = KCS3DO, .dib = KCS3DI, .ctl = KCS3CTL, .ie = KCS3IE },
> };
>
>+static inline struct npcm7xx_kcs_bmc *to_npcm7xx_kcs_bmc(struct kcs_bmc *kcs_bmc)
>+{
>+ return container_of(kcs_bmc, struct npcm7xx_kcs_bmc, kcs_bmc);
>+}
>+
> static u8 npcm7xx_kcs_inb(struct kcs_bmc *kcs_bmc, u32 reg)
> {
>- struct npcm7xx_kcs_bmc *priv = kcs_bmc_priv(kcs_bmc);
>+ struct npcm7xx_kcs_bmc *priv = to_npcm7xx_kcs_bmc(kcs_bmc);
> u32 val = 0;
> int rc;
>
>@@ -90,7 +97,7 @@ static u8 npcm7xx_kcs_inb(struct kcs_bmc *kcs_bmc, u32 reg)
>
> static void npcm7xx_kcs_outb(struct kcs_bmc *kcs_bmc, u32 reg, u8 data)
> {
>- struct npcm7xx_kcs_bmc *priv = kcs_bmc_priv(kcs_bmc);
>+ struct npcm7xx_kcs_bmc *priv = to_npcm7xx_kcs_bmc(kcs_bmc);
> int rc;
>
> rc = regmap_write(priv->map, reg, data);
>@@ -99,7 +106,7 @@ static void npcm7xx_kcs_outb(struct kcs_bmc *kcs_bmc, u32 reg, u8 data)
>
> static void npcm7xx_kcs_updateb(struct kcs_bmc *kcs_bmc, u32 reg, u8 mask, u8 data)
> {
>- struct npcm7xx_kcs_bmc *priv = kcs_bmc_priv(kcs_bmc);
>+ struct npcm7xx_kcs_bmc *priv = to_npcm7xx_kcs_bmc(kcs_bmc);
> int rc;
>
> rc = regmap_update_bits(priv->map, reg, mask, data);
>@@ -108,7 +115,7 @@ static void npcm7xx_kcs_updateb(struct kcs_bmc *kcs_bmc, u32 reg, u8 mask, u8 da
>
> static void npcm7xx_kcs_enable_channel(struct kcs_bmc *kcs_bmc, bool enable)
> {
>- struct npcm7xx_kcs_bmc *priv = kcs_bmc_priv(kcs_bmc);
>+ struct npcm7xx_kcs_bmc *priv = to_npcm7xx_kcs_bmc(kcs_bmc);
>
> regmap_update_bits(priv->map, priv->reg->ctl, KCS_CTL_IBFIE,
> enable ? KCS_CTL_IBFIE : 0);
>@@ -155,11 +162,10 @@ static int npcm7xx_kcs_probe(struct platform_device *pdev)
> return -ENODEV;
> }
>
>- kcs_bmc = kcs_bmc_alloc(dev, sizeof(*priv), chan);
>- if (!kcs_bmc)
>+ priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
>+ if (!priv)
> return -ENOMEM;
>
>- priv = kcs_bmc_priv(kcs_bmc);
> priv->map = syscon_node_to_regmap(dev->parent->of_node);
> if (IS_ERR(priv->map)) {
> dev_err(dev, "Couldn't get regmap\n");
>@@ -167,6 +173,9 @@ static int npcm7xx_kcs_probe(struct platform_device *pdev)
> }
> priv->reg = &npcm7xx_kcs_reg_tbl[chan - 1];
>
>+ kcs_bmc = &priv->kcs_bmc;
>+ kcs_bmc->dev = &pdev->dev;
>+ kcs_bmc->channel = chan;
> kcs_bmc->ioreg.idr = priv->reg->dib;
> kcs_bmc->ioreg.odr = priv->reg->dob;
> kcs_bmc->ioreg.str = priv->reg->sts;
>@@ -174,31 +183,27 @@ static int npcm7xx_kcs_probe(struct platform_device *pdev)
> kcs_bmc->io_outputb = npcm7xx_kcs_outb;
> kcs_bmc->io_updateb = npcm7xx_kcs_updateb;
>
>- dev_set_drvdata(dev, kcs_bmc);
>+ platform_set_drvdata(pdev, priv);
>
> npcm7xx_kcs_enable_channel(kcs_bmc, true);
> rc = npcm7xx_kcs_config_irq(kcs_bmc, pdev);
> if (rc)
> return rc;
>
>- rc = misc_register(&kcs_bmc->miscdev);
>- if (rc) {
>- dev_err(dev, "Unable to register device\n");
>- return rc;
>- }
>
> pr_info("channel=%u idr=0x%x odr=0x%x str=0x%x\n",
> chan,
> kcs_bmc->ioreg.idr, kcs_bmc->ioreg.odr, kcs_bmc->ioreg.str);
>
>- return 0;
>+ return kcs_bmc_add_device(kcs_bmc);
> }
>
> static int npcm7xx_kcs_remove(struct platform_device *pdev)
> {
>- struct kcs_bmc *kcs_bmc = dev_get_drvdata(&pdev->dev);
>+ struct npcm7xx_kcs_bmc *priv = platform_get_drvdata(pdev);
>+ struct kcs_bmc *kcs_bmc = &priv->kcs_bmc;
>
>- misc_deregister(&kcs_bmc->miscdev);
>+ kcs_bmc_remove_device(kcs_bmc);

As with the corresponding aspeed code, should we propagate the return
value here?

>
> return 0;
> }
>--
>2.27.0
>

Next message: Zev Weiss: "Re: [PATCH v2 13/21] ipmi: kcs_bmc: Decouple the IPMI chardev from the core"
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