On Tue, 20 Aug 2024, Suma Hegde wrote:
> Move out of device_add_group() variants, instead assign static array of
> attribute groups to .dev_groups in platform_driver structure.
> Then use is_visible to enable only the necessary files on the platform.
>
> .read() and .is_bin_visibile() have slightly different
> implemetations on ACPI and non-ACPI system, so move them
> to respective files.
>
> Signed-off-by: Suma Hegde <suma.hegde@xxxxxxx>
> Reviewed-by: Naveen Krishna Chatradhi <naveenkrishna.chatradhi@xxxxxxx>
> ---
> Changes since v3:
> This patch and next patch(9th and 10th patch in v3 series) are merged
> and commit description is updated.
>
> Changes since v2:
> None
>
> Changes since v1:
> 1. Change is_visible to is_bin_visible in commit message
> 1. Add parenthesis around read and is_bin_visible in commit message
> 2. Change plat_dev to hsmp_pdev, hsmp_device to mdev
> 3. Remove unnecessary if, else conditions in hsmp_is_sock_attr_visible
> 4. Change un cached to un-cached
>
> drivers/platform/x86/amd/hsmp/acpi.c | 74 +++++++++++----
> drivers/platform/x86/amd/hsmp/hsmp.c | 77 +--------------
> drivers/platform/x86/amd/hsmp/hsmp.h | 8 +-
> drivers/platform/x86/amd/hsmp/plat.c | 135 ++++++++++++++++++++++-----
> 4 files changed, 170 insertions(+), 124 deletions(-)
>
> diff --git a/drivers/platform/x86/amd/hsmp/acpi.c b/drivers/platform/x86/amd/hsmp/acpi.c
> index 6aa7810ebc71..81d49dee3f9b 100644
> --- a/drivers/platform/x86/amd/hsmp/acpi.c
> +++ b/drivers/platform/x86/amd/hsmp/acpi.c
> @@ -9,6 +9,7 @@
>
> #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
>
> +#include <asm/amd_hsmp.h>
> #include <asm/amd_nb.h>
>
> #include <linux/acpi.h>
> @@ -217,6 +218,8 @@ static int hsmp_parse_acpi_table(struct device *dev, u16 sock_ind)
>
> sema_init(&sock->hsmp_sem, 1);
>
> + dev_set_drvdata(dev, sock);
> +
> /* Read MP1 base address from CRS method */
> ret = hsmp_read_acpi_crs(sock);
> if (ret)
> @@ -226,27 +229,42 @@ static int hsmp_parse_acpi_table(struct device *dev, u16 sock_ind)
> return hsmp_read_acpi_dsd(sock);
> }
>
> -static int hsmp_create_acpi_sysfs_if(struct device *dev)
> +static ssize_t hsmp_metric_tbl_read(struct file *filp, struct kobject *kobj,
> + struct bin_attribute *bin_attr, char *buf,
> + loff_t off, size_t count)
> {
> - struct attribute_group *attr_grp;
> - u16 sock_ind;
> + struct device *dev = container_of(kobj, struct device, kobj);
> + struct hsmp_socket *sock = dev_get_drvdata(dev);
> + struct hsmp_message msg = { 0 };
> int ret;
>
> - attr_grp = devm_kzalloc(dev, sizeof(struct attribute_group), GFP_KERNEL);
> - if (!attr_grp)
> - return -ENOMEM;
> + if (!sock)
> + return -EINVAL;
>
> - attr_grp->is_bin_visible = hsmp_is_sock_attr_visible;
> + /* Do not support lseek(), reads entire metric table */
> + if (count < bin_attr->size) {
> + dev_err(sock->dev, "Wrong buffer size\n");
> + return -EINVAL;
> + }
>
> - ret = hsmp_get_uid(dev, &sock_ind);
> - if (ret)
> - return ret;
> + msg.msg_id = HSMP_GET_METRIC_TABLE;
> + msg.sock_ind = sock->sock_ind;
>
> - ret = hsmp_create_attr_list(attr_grp, dev, sock_ind);
> + ret = hsmp_send_message(&msg);
> if (ret)
> return ret;
> + memcpy_fromio(buf, sock->metric_tbl_addr, bin_attr->size);
> +
> + return bin_attr->size;
> +}
>
> - return devm_device_add_group(dev, attr_grp);
> +static umode_t hsmp_is_sock_attr_visible(struct kobject *kobj,
> + struct bin_attribute *battr, int id)
> +{
> + if (hsmp_pdev.proto_ver == HSMP_PROTO_VER6)
> + return battr->attr.mode;
> +
> + return 0;
> }
>
> static int init_acpi(struct device *dev)
> @@ -281,9 +299,36 @@ static int init_acpi(struct device *dev)
> return ret;
> }
>
> + if (hsmp_pdev.proto_ver == HSMP_PROTO_VER6) {
> + ret = hsmp_get_tbl_dram_base(sock_ind);
> + if (ret)
> + dev_err(dev, "Failed to init metric table\n");
> + }
> +
> return ret;
> }
>
> +static struct bin_attribute hsmp_metric_tbl_attr = {
> + .attr = { .name = HSMP_METRICS_TABLE_NAME, .mode = 0444},
> + .read = hsmp_metric_tbl_read,
> + .size = sizeof(struct hsmp_metric_table),
> +};
> +
> +static struct bin_attribute *hsmp_attr_list[] = {
> + &hsmp_metric_tbl_attr,
> + NULL
> +};
> +
> +static struct attribute_group hsmp_attr_grp = {
> + .bin_attrs = hsmp_attr_list,
> + .is_bin_visible = hsmp_is_sock_attr_visible,
> +};
> +
> +static const struct attribute_group *hsmp_groups[] = {
> + &hsmp_attr_grp,
> + NULL
> +};
> +
> static const struct acpi_device_id amd_hsmp_acpi_ids[] = {
> {ACPI_HSMP_DEVICE_HID, 0},
> {}
> @@ -327,10 +372,6 @@ static int hsmp_acpi_probe(struct platform_device *pdev)
> return ret;
> }
>
> - ret = hsmp_create_acpi_sysfs_if(&pdev->dev);
> - if (ret)
> - dev_err(&pdev->dev, "Failed to create HSMP sysfs interface\n");
> -
> if (!hsmp_pdev.is_probed) {
> hsmp_pdev.mdev.name = HSMP_CDEV_NAME;
> hsmp_pdev.mdev.minor = MISC_DYNAMIC_MINOR;
> @@ -366,6 +407,7 @@ static struct platform_driver amd_hsmp_driver = {
> .driver = {
> .name = DRIVER_NAME,
> .acpi_match_table = amd_hsmp_acpi_ids,
> + .dev_groups = hsmp_groups,
> },
> };
>
> diff --git a/drivers/platform/x86/amd/hsmp/hsmp.c b/drivers/platform/x86/amd/hsmp/hsmp.c
> index 32adf6a1415b..5daf86de9a9d 100644
> --- a/drivers/platform/x86/amd/hsmp/hsmp.c
> +++ b/drivers/platform/x86/amd/hsmp/hsmp.c
> @@ -278,35 +278,7 @@ long hsmp_ioctl(struct file *fp, unsigned int cmd, unsigned long arg)
> return 0;
> }
>
> -ssize_t hsmp_metric_tbl_read(struct file *filp, struct kobject *kobj,
> - struct bin_attribute *bin_attr, char *buf,
> - loff_t off, size_t count)
> -{
> - struct hsmp_socket *sock = bin_attr->private;
> - struct hsmp_message msg = { 0 };
> - int ret;
> -
> - if (!sock)
> - return -EINVAL;
> -
> - /* Do not support lseek(), reads entire metric table */
> - if (count < bin_attr->size) {
> - dev_err(sock->dev, "Wrong buffer size\n");
> - return -EINVAL;
> - }
> -
> - msg.msg_id = HSMP_GET_METRIC_TABLE;
> - msg.sock_ind = sock->sock_ind;
> -
> - ret = hsmp_send_message(&msg);
> - if (ret)
> - return ret;
> - memcpy_fromio(buf, sock->metric_tbl_addr, bin_attr->size);
> -
> - return bin_attr->size;
> -}
> -
> -static int hsmp_get_tbl_dram_base(u16 sock_ind)
> +int hsmp_get_tbl_dram_base(u16 sock_ind)
> {
> struct hsmp_socket *sock = &hsmp_pdev.sock[sock_ind];
> struct hsmp_message msg = { 0 };
> @@ -339,53 +311,6 @@ static int hsmp_get_tbl_dram_base(u16 sock_ind)
> return 0;
> }
>
> -umode_t hsmp_is_sock_attr_visible(struct kobject *kobj,
> - struct bin_attribute *battr, int id)
> -{
> - if (hsmp_pdev.proto_ver == HSMP_PROTO_VER6)
> - return battr->attr.mode;
> - else
> - return 0;
> -}
> -
> -static int hsmp_init_metric_tbl_bin_attr(struct bin_attribute **hattrs, u16 sock_ind)
> -{
> - struct bin_attribute *hattr = &hsmp_pdev.sock[sock_ind].hsmp_attr;
> -
> - sysfs_bin_attr_init(hattr);
> - hattr->attr.name = HSMP_METRICS_TABLE_NAME;
> - hattr->attr.mode = 0444;
> - hattr->read = hsmp_metric_tbl_read;
> - hattr->size = sizeof(struct hsmp_metric_table);
> - hattr->private = &hsmp_pdev.sock[sock_ind];
> - hattrs[0] = hattr;
> -
> - if (hsmp_pdev.proto_ver == HSMP_PROTO_VER6)
> - return hsmp_get_tbl_dram_base(sock_ind);
> - else
> - return 0;
> -}
> -
> -/* One bin sysfs for metrics table */
> -#define NUM_HSMP_ATTRS 1
> -
> -int hsmp_create_attr_list(struct attribute_group *attr_grp,
> - struct device *dev, u16 sock_ind)
> -{
> - struct bin_attribute **hsmp_bin_attrs;
> -
> - /* Null terminated list of attributes */
> - hsmp_bin_attrs = devm_kcalloc(dev, NUM_HSMP_ATTRS + 1,
> - sizeof(*hsmp_bin_attrs),
> - GFP_KERNEL);
> - if (!hsmp_bin_attrs)
> - return -ENOMEM;
> -
> - attr_grp->bin_attrs = hsmp_bin_attrs;
> -
> - return hsmp_init_metric_tbl_bin_attr(hsmp_bin_attrs, sock_ind);
> -}
> -
> int hsmp_cache_proto_ver(u16 sock_ind)
> {
> struct hsmp_message msg = { 0 };
> diff --git a/drivers/platform/x86/amd/hsmp/hsmp.h b/drivers/platform/x86/amd/hsmp/hsmp.h
> index 90d76070c93a..a202597fe0cc 100644
> --- a/drivers/platform/x86/amd/hsmp/hsmp.h
> +++ b/drivers/platform/x86/amd/hsmp/hsmp.h
> @@ -57,14 +57,8 @@ struct hsmp_plat_device {
>
> extern struct hsmp_plat_device hsmp_pdev;
>
> -ssize_t hsmp_metric_tbl_read(struct file *filp, struct kobject *kobj,
> - struct bin_attribute *bin_attr, char *buf,
> - loff_t off, size_t count);
> int hsmp_cache_proto_ver(u16 sock_ind);
> -umode_t hsmp_is_sock_attr_visible(struct kobject *kobj,
> - struct bin_attribute *battr, int id);
> -int hsmp_create_attr_list(struct attribute_group *attr_grp,
> - struct device *dev, u16 sock_ind);
> int hsmp_test(u16 sock_ind, u32 value);
> long hsmp_ioctl(struct file *fp, unsigned int cmd, unsigned long arg);
> +int hsmp_get_tbl_dram_base(u16 sock_ind);
> #endif /* HSMP_H */
> diff --git a/drivers/platform/x86/amd/hsmp/plat.c b/drivers/platform/x86/amd/hsmp/plat.c
> index bc1f2693c04e..a0f2fb6750a1 100644
> --- a/drivers/platform/x86/amd/hsmp/plat.c
> +++ b/drivers/platform/x86/amd/hsmp/plat.c
> @@ -9,6 +9,7 @@
>
> #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
>
> +#include <asm/amd_hsmp.h>
> #include <asm/amd_nb.h>
>
> #include <linux/device.h>
> @@ -61,36 +62,117 @@ static const struct file_operations hsmp_fops = {
> .compat_ioctl = hsmp_ioctl,
> };
>
> -static int hsmp_create_non_acpi_sysfs_if(struct device *dev)
> +static ssize_t hsmp_metric_tbl_read(struct file *filp, struct kobject *kobj,
> + struct bin_attribute *bin_attr, char *buf,
> + loff_t off, size_t count)
> {
> - const struct attribute_group **hsmp_attr_grps;
> - struct attribute_group *attr_grp;
> - u16 i;
> + struct hsmp_message msg = { 0 };
> + struct hsmp_socket *sock;
> + u8 sock_ind;
> + int ret;
>
> - hsmp_attr_grps = devm_kcalloc(dev, hsmp_pdev.num_sockets + 1,
> - sizeof(*hsmp_attr_grps),
> - GFP_KERNEL);
> - if (!hsmp_attr_grps)
> - return -ENOMEM;
> + ret = kstrtou8(bin_attr->private, 10, &sock_ind);
Why is ->private a string?
--
i.
> + if (ret)
> + return ret;
>
> - /* Create a sysfs directory for each socket */
> - for (i = 0; i < hsmp_pdev.num_sockets; i++) {
> - attr_grp = devm_kzalloc(dev, sizeof(struct attribute_group),
> - GFP_KERNEL);
> - if (!attr_grp)
> - return -ENOMEM;
> + if (sock_ind >= hsmp_pdev.num_sockets)
> + return -EINVAL;
>
> - snprintf(hsmp_pdev.sock[i].name, HSMP_ATTR_GRP_NAME_SIZE, "socket%u", (u8)i);
> - attr_grp->name = hsmp_pdev.sock[i].name;
> - attr_grp->is_bin_visible = hsmp_is_sock_attr_visible;
> - hsmp_attr_grps[i] = attr_grp;
> + sock = &hsmp_pdev.sock[sock_ind];
> + if (!sock)
> + return -EINVAL;
>
> - hsmp_create_attr_list(attr_grp, dev, i);
> + /* Do not support lseek(), reads entire metric table */
> + if (count < bin_attr->size) {
> + dev_err(sock->dev, "Wrong buffer size\n");
> + return -EINVAL;
> }
>
> - return device_add_groups(dev, hsmp_attr_grps);
> + msg.msg_id = HSMP_GET_METRIC_TABLE;
> + msg.sock_ind = sock_ind;
> +
> + ret = hsmp_send_message(&msg);
> + if (ret)
> + return ret;
> + memcpy_fromio(buf, sock->metric_tbl_addr, bin_attr->size);
> +
> + return bin_attr->size;
> +}
> +
> +static umode_t hsmp_is_sock_attr_visible(struct kobject *kobj,
> + struct bin_attribute *battr, int id)
> +{
> + u8 sock_ind;
> + int ret;
> +
> + ret = kstrtou8(battr->private, 10, &sock_ind);
> + if (ret)
> + return ret;
> +
> + if (id == 0 && sock_ind >= hsmp_pdev.num_sockets)
> + return SYSFS_GROUP_INVISIBLE;
> +
> + if (hsmp_pdev.proto_ver == HSMP_PROTO_VER6)
> + return battr->attr.mode;
> +
> + return 0;
> +}
> +
> +/*
> + * AMD supports maximum of 8 sockets in a system.
> + * Static array of 8 + 1(for NULL) elements is created below
> + * to create sysfs groups for sockets.
> + * is_bin_visible function is used to show / hide the necessary groups.
> + */
> +#define HSMP_BIN_ATTR(index, _list) \
> +static struct bin_attribute attr##index = { \
> + .attr = { .name = HSMP_METRICS_TABLE_NAME, .mode = 0444}, \
> + .private = #index, \
> + .read = hsmp_metric_tbl_read, \
> + .size = sizeof(struct hsmp_metric_table), \
> +}; \
> +static struct bin_attribute _list[] = { \
> + &attr##index, \
> + NULL \
> }
>
> +HSMP_BIN_ATTR(0, *sock0_attr_list);
> +HSMP_BIN_ATTR(1, *sock1_attr_list);
> +HSMP_BIN_ATTR(2, *sock2_attr_list);
> +HSMP_BIN_ATTR(3, *sock3_attr_list);
> +HSMP_BIN_ATTR(4, *sock4_attr_list);
> +HSMP_BIN_ATTR(5, *sock5_attr_list);
> +HSMP_BIN_ATTR(6, *sock6_attr_list);
> +HSMP_BIN_ATTR(7, *sock7_attr_list);
> +
> +#define HSMP_BIN_ATTR_GRP(index, _list, _name) \
> +static struct attribute_group sock##index##_attr_grp = { \
> + .bin_attrs = _list, \
> + .is_bin_visible = hsmp_is_sock_attr_visible, \
> + .name = #_name, \
> +}
> +
> +HSMP_BIN_ATTR_GRP(0, sock0_attr_list, socket0);
> +HSMP_BIN_ATTR_GRP(1, sock1_attr_list, socket1);
> +HSMP_BIN_ATTR_GRP(2, sock2_attr_list, socket2);
> +HSMP_BIN_ATTR_GRP(3, sock3_attr_list, socket3);
> +HSMP_BIN_ATTR_GRP(4, sock4_attr_list, socket4);
> +HSMP_BIN_ATTR_GRP(5, sock5_attr_list, socket5);
> +HSMP_BIN_ATTR_GRP(6, sock6_attr_list, socket6);
> +HSMP_BIN_ATTR_GRP(7, sock7_attr_list, socket7);
> +
> +static const struct attribute_group *hsmp_groups[] = {
> + &sock0_attr_grp,
> + &sock1_attr_grp,
> + &sock2_attr_grp,
> + &sock3_attr_grp,
> + &sock4_attr_grp,
> + &sock5_attr_grp,
> + &sock6_attr_grp,
> + &sock7_attr_grp,
> + NULL
> +};
> +
> static inline bool is_f1a_m0h(void)
> {
> if (boot_cpu_data.x86 == 0x1A && boot_cpu_data.x86_model <= 0x0F)
> @@ -141,6 +223,12 @@ static int init_platform_device(struct device *dev)
> dev_err(dev, "Failed to read HSMP protocol version\n");
> return ret;
> }
> +
> + if (hsmp_pdev.proto_ver == HSMP_PROTO_VER6) {
> + ret = hsmp_get_tbl_dram_base(i);
> + if (ret)
> + dev_err(dev, "Failed to init metric table\n");
> + }
> }
>
> return 0;
> @@ -162,10 +250,6 @@ static int hsmp_pltdrv_probe(struct platform_device *pdev)
> return ret;
> }
>
> - ret = hsmp_create_non_acpi_sysfs_if(&pdev->dev);
> - if (ret)
> - dev_err(&pdev->dev, "Failed to create HSMP sysfs interface\n");
> -
> hsmp_pdev.mdev.name = HSMP_CDEV_NAME;
> hsmp_pdev.mdev.minor = MISC_DYNAMIC_MINOR;
> hsmp_pdev.mdev.fops = &hsmp_fops;
> @@ -186,6 +270,7 @@ static struct platform_driver amd_hsmp_driver = {
> .remove_new = hsmp_pltdrv_remove,
> .driver = {
> .name = DRIVER_NAME,
> + .dev_groups = hsmp_groups,
> },
> };
>
>
