On Thu, 12 Dec 2024, Yazen Ghannam wrote: > The HSMP interface is just an SMN interface with different offsets. > > Define an HSMP wrapper in the SMN code and have the HSMP platform driver > use that rather than a local solution. > > Also, remove the "root" member from AMD_NB, since there are no more > users of it. > > Signed-off-by: Yazen Ghannam <yazen.ghannam@xxxxxxx> > --- > > Notes: > Link: > https://lore.kernel.org/20241206161210.163701-15-yazen.ghannam@xxxxxxx > > v2->v2.1: > * Include static_assert() and comment for sysfs attributes. > > v1->v2: > * Rebase on recent HSMP rework. > > arch/x86/include/asm/amd_nb.h | 1 - > arch/x86/include/asm/amd_node.h | 3 +++ > arch/x86/kernel/amd_nb.c | 1 - > arch/x86/kernel/amd_node.c | 9 +++++++ > drivers/platform/x86/amd/hsmp/Kconfig | 2 +- > drivers/platform/x86/amd/hsmp/acpi.c | 7 +++--- > drivers/platform/x86/amd/hsmp/hsmp.c | 1 - > drivers/platform/x86/amd/hsmp/hsmp.h | 3 --- > drivers/platform/x86/amd/hsmp/plat.c | 35 +++++++++------------------ > 9 files changed, 28 insertions(+), 34 deletions(-) > > diff --git a/arch/x86/include/asm/amd_nb.h b/arch/x86/include/asm/amd_nb.h > index 4c4efb93045e..adfa0854cf2d 100644 > --- a/arch/x86/include/asm/amd_nb.h > +++ b/arch/x86/include/asm/amd_nb.h > @@ -27,7 +27,6 @@ struct amd_l3_cache { > }; > > struct amd_northbridge { > - struct pci_dev *root; > struct pci_dev *misc; > struct pci_dev *link; > struct amd_l3_cache l3_cache; > diff --git a/arch/x86/include/asm/amd_node.h b/arch/x86/include/asm/amd_node.h > index 113ad3e8ee40..5fe9c6537434 100644 > --- a/arch/x86/include/asm/amd_node.h > +++ b/arch/x86/include/asm/amd_node.h > @@ -33,4 +33,7 @@ static inline u16 amd_num_nodes(void) > int __must_check amd_smn_read(u16 node, u32 address, u32 *value); > int __must_check amd_smn_write(u16 node, u32 address, u32 value); > > +/* Should only be used by the HSMP driver. */ > +int __must_check amd_smn_hsmp_rdwr(u16 node, u32 address, u32 *value, bool write); > + > #endif /*_ASM_X86_AMD_NODE_H_*/ > diff --git a/arch/x86/kernel/amd_nb.c b/arch/x86/kernel/amd_nb.c > index 2729e99806ec..3a20312062af 100644 > --- a/arch/x86/kernel/amd_nb.c > +++ b/arch/x86/kernel/amd_nb.c > @@ -73,7 +73,6 @@ static int amd_cache_northbridges(void) > amd_northbridges.nb = nb; > > for (i = 0; i < amd_northbridges.num; i++) { > - node_to_amd_nb(i)->root = amd_node_get_root(i); > node_to_amd_nb(i)->misc = amd_node_get_func(i, 3); > node_to_amd_nb(i)->link = amd_node_get_func(i, 4); > } > diff --git a/arch/x86/kernel/amd_node.c b/arch/x86/kernel/amd_node.c > index d2ec7fd555c5..65045f223c10 100644 > --- a/arch/x86/kernel/amd_node.c > +++ b/arch/x86/kernel/amd_node.c > @@ -97,6 +97,9 @@ static DEFINE_MUTEX(smn_mutex); > #define SMN_INDEX_OFFSET 0x60 > #define SMN_DATA_OFFSET 0x64 > > +#define HSMP_INDEX_OFFSET 0xc4 > +#define HSMP_DATA_OFFSET 0xc8 > + > /* > * SMN accesses may fail in ways that are difficult to detect here in the called > * functions amd_smn_read() and amd_smn_write(). Therefore, callers must do > @@ -179,6 +182,12 @@ int __must_check amd_smn_write(u16 node, u32 address, u32 value) > } > EXPORT_SYMBOL_GPL(amd_smn_write); > > +int __must_check amd_smn_hsmp_rdwr(u16 node, u32 address, u32 *value, bool write) > +{ > + return __amd_smn_rw(HSMP_INDEX_OFFSET, HSMP_DATA_OFFSET, node, address, value, write); > +} > +EXPORT_SYMBOL_GPL(amd_smn_hsmp_rdwr); > + > static int amd_cache_roots(void) > { > u16 node, num_nodes = amd_num_nodes(); > diff --git a/drivers/platform/x86/amd/hsmp/Kconfig b/drivers/platform/x86/amd/hsmp/Kconfig > index 7d10d4462a45..d6f7a62d55b5 100644 > --- a/drivers/platform/x86/amd/hsmp/Kconfig > +++ b/drivers/platform/x86/amd/hsmp/Kconfig > @@ -7,7 +7,7 @@ config AMD_HSMP > tristate > > menu "AMD HSMP Driver" > - depends on AMD_NB || COMPILE_TEST > + depends on AMD_NODE || COMPILE_TEST > > config AMD_HSMP_ACPI > tristate "AMD HSMP ACPI device driver" > diff --git a/drivers/platform/x86/amd/hsmp/acpi.c b/drivers/platform/x86/amd/hsmp/acpi.c > index e981d45e1c12..28565ca78afd 100644 > --- a/drivers/platform/x86/amd/hsmp/acpi.c > +++ b/drivers/platform/x86/amd/hsmp/acpi.c > @@ -10,7 +10,6 @@ > #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt > > #include <asm/amd_hsmp.h> > -#include <asm/amd_nb.h> > > #include <linux/acpi.h> > #include <linux/device.h> > @@ -24,6 +23,8 @@ > > #include <uapi/asm-generic/errno-base.h> > > +#include <asm/amd_node.h> > + > #include "hsmp.h" > > #define DRIVER_NAME "amd_hsmp" > @@ -321,8 +322,8 @@ static int hsmp_acpi_probe(struct platform_device *pdev) > return -ENOMEM; > > if (!hsmp_pdev->is_probed) { > - hsmp_pdev->num_sockets = amd_nb_num(); > - if (hsmp_pdev->num_sockets == 0 || hsmp_pdev->num_sockets > MAX_AMD_SOCKETS) > + hsmp_pdev->num_sockets = amd_num_nodes(); > + if (hsmp_pdev->num_sockets == 0 || hsmp_pdev->num_sockets > MAX_AMD_NUM_NODES) > return -ENODEV; > > hsmp_pdev->sock = devm_kcalloc(&pdev->dev, hsmp_pdev->num_sockets, > diff --git a/drivers/platform/x86/amd/hsmp/hsmp.c b/drivers/platform/x86/amd/hsmp/hsmp.c > index 227b4ad4a51a..e04c613ad5d6 100644 > --- a/drivers/platform/x86/amd/hsmp/hsmp.c > +++ b/drivers/platform/x86/amd/hsmp/hsmp.c > @@ -8,7 +8,6 @@ > */ > > #include <asm/amd_hsmp.h> > -#include <asm/amd_nb.h> > > #include <linux/acpi.h> > #include <linux/delay.h> > diff --git a/drivers/platform/x86/amd/hsmp/hsmp.h b/drivers/platform/x86/amd/hsmp/hsmp.h > index e852f0a947e4..af8b21f821d6 100644 > --- a/drivers/platform/x86/amd/hsmp/hsmp.h > +++ b/drivers/platform/x86/amd/hsmp/hsmp.h > @@ -21,8 +21,6 @@ > > #define HSMP_ATTR_GRP_NAME_SIZE 10 > > -#define MAX_AMD_SOCKETS 8 > - > #define HSMP_CDEV_NAME "hsmp_cdev" > #define HSMP_DEVNODE_NAME "hsmp" > > @@ -41,7 +39,6 @@ struct hsmp_socket { > void __iomem *virt_base_addr; > struct semaphore hsmp_sem; > char name[HSMP_ATTR_GRP_NAME_SIZE]; > - struct pci_dev *root; > struct device *dev; > u16 sock_ind; > int (*amd_hsmp_rdwr)(struct hsmp_socket *sock, u32 off, u32 *val, bool rw); > diff --git a/drivers/platform/x86/amd/hsmp/plat.c b/drivers/platform/x86/amd/hsmp/plat.c > index a61f815c9f80..32921092b0c8 100644 > --- a/drivers/platform/x86/amd/hsmp/plat.c > +++ b/drivers/platform/x86/amd/hsmp/plat.c > @@ -10,7 +10,6 @@ > #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt > > #include <asm/amd_hsmp.h> > -#include <asm/amd_nb.h> > > #include <linux/device.h> > #include <linux/module.h> > @@ -18,6 +17,8 @@ > #include <linux/platform_device.h> > #include <linux/sysfs.h> > > +#include <asm/amd_node.h> > + > #include "hsmp.h" > > #define DRIVER_NAME "amd_hsmp" > @@ -34,28 +35,12 @@ > #define SMN_HSMP_MSG_RESP 0x0010980 > #define SMN_HSMP_MSG_DATA 0x00109E0 > > -#define HSMP_INDEX_REG 0xc4 > -#define HSMP_DATA_REG 0xc8 > - > static struct hsmp_plat_device *hsmp_pdev; > > static int amd_hsmp_pci_rdwr(struct hsmp_socket *sock, u32 offset, > u32 *value, bool write) > { > - int ret; > - > - if (!sock->root) > - return -ENODEV; > - > - ret = pci_write_config_dword(sock->root, HSMP_INDEX_REG, > - sock->mbinfo.base_addr + offset); > - if (ret) > - return ret; > - > - ret = (write ? pci_write_config_dword(sock->root, HSMP_DATA_REG, *value) > - : pci_read_config_dword(sock->root, HSMP_DATA_REG, value)); > - > - return ret; > + return amd_smn_hsmp_rdwr(sock->sock_ind, sock->mbinfo.base_addr + offset, value, write); > } > > static ssize_t hsmp_metric_tbl_plat_read(struct file *filp, struct kobject *kobj, > @@ -95,7 +80,12 @@ static umode_t hsmp_is_sock_attr_visible(struct kobject *kobj, > * 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. > + * > + * Validate the maximum number against MAX_AMD_NUM_NODES. If this changes, > + * then the attributes and groups below must be adjusted. > */ > +static_assert(MAX_AMD_NUM_NODES == 8); Please also add the #include for it. -- i. > #define HSMP_BIN_ATTR(index, _list) \ > static struct bin_attribute attr##index = { \ > .attr = { .name = HSMP_METRICS_TABLE_NAME, .mode = 0444}, \ > @@ -159,10 +149,7 @@ static int init_platform_device(struct device *dev) > int ret, i; > > for (i = 0; i < hsmp_pdev->num_sockets; i++) { > - if (!node_to_amd_nb(i)) > - return -ENODEV; > sock = &hsmp_pdev->sock[i]; > - sock->root = node_to_amd_nb(i)->root; > sock->sock_ind = i; > sock->dev = dev; > sock->mbinfo.base_addr = SMN_HSMP_BASE; > @@ -305,11 +292,11 @@ static int __init hsmp_plt_init(void) > return -ENOMEM; > > /* > - * amd_nb_num() returns number of SMN/DF interfaces present in the system > + * amd_num_nodes() returns number of SMN/DF interfaces present in the system > * if we have N SMN/DF interfaces that ideally means N sockets > */ > - hsmp_pdev->num_sockets = amd_nb_num(); > - if (hsmp_pdev->num_sockets == 0 || hsmp_pdev->num_sockets > MAX_AMD_SOCKETS) > + hsmp_pdev->num_sockets = amd_num_nodes(); > + if (hsmp_pdev->num_sockets == 0 || hsmp_pdev->num_sockets > MAX_AMD_NUM_NODES) > return ret; > > ret = platform_driver_register(&amd_hsmp_driver); >
