[tip: x86/platform] x86/platform/uv: Add UV Hubbed/Hubless Proc FS Files
From: tip-bot2 for Mike Travis
Date: Mon Oct 07 2019 - 10:49:48 EST
The following commit has been merged into the x86/platform branch of tip:
Commit-ID: 8785968bce1cc7368ea95c3e1e5b9210f56f6667
Gitweb: https://git.kernel.org/tip/8785968bce1cc7368ea95c3e1e5b9210f56f6667
Author: Mike Travis <mike.travis@xxxxxxx>
AuthorDate: Tue, 10 Sep 2019 09:58:44 -05:00
Committer: Ingo Molnar <mingo@xxxxxxxxxx>
CommitterDate: Mon, 07 Oct 2019 13:42:10 +02:00
x86/platform/uv: Add UV Hubbed/Hubless Proc FS Files
Indicate to UV user utilities that UV hubless support is available on
this system via the existing /proc infterface. The current interface is
maintained with the addition of new /proc leaves ("hubbed", "hubless",
and "oemid") that contain the specific type of UV arch this one is.
Signed-off-by: Mike Travis <mike.travis@xxxxxxx>
Reviewed-by: Steve Wahl <steve.wahl@xxxxxxx>
Reviewed-by: Dimitri Sivanich <dimitri.sivanich@xxxxxxx>
Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Cc: Borislav Petkov <bp@xxxxxxxxx>
Cc: Christoph Hellwig <hch@xxxxxxxxxxxxx>
Cc: H. Peter Anvin <hpa@xxxxxxxxx>
Cc: Hedi Berriche <hedi.berriche@xxxxxxx>
Cc: Justin Ernst <justin.ernst@xxxxxxx>
Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Russ Anderson <russ.anderson@xxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Link: https://lkml.kernel.org/r/20190910145840.055590900@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>
---
arch/x86/include/asm/uv/uv.h | 4 +-
arch/x86/kernel/apic/x2apic_uv_x.c | 93 ++++++++++++++++++++++++++++-
2 files changed, 96 insertions(+), 1 deletion(-)
diff --git a/arch/x86/include/asm/uv/uv.h b/arch/x86/include/asm/uv/uv.h
index 792faab..45ea95c 100644
--- a/arch/x86/include/asm/uv/uv.h
+++ b/arch/x86/include/asm/uv/uv.h
@@ -12,6 +12,8 @@ struct mm_struct;
#ifdef CONFIG_X86_UV
#include <linux/efi.h>
+#define UV_PROC_NODE "sgi_uv"
+
static inline int uv(int uvtype)
{
/* uv(0) is "any" */
@@ -28,6 +30,7 @@ static inline bool is_early_uv_system(void)
return uv_systab_phys && uv_systab_phys != EFI_INVALID_TABLE_ADDR;
}
extern int is_uv_system(void);
+extern int is_uv_hubbed(int uvtype);
extern int is_uv_hubless(int uvtype);
extern void uv_cpu_init(void);
extern void uv_nmi_init(void);
@@ -40,6 +43,7 @@ extern const struct cpumask *uv_flush_tlb_others(const struct cpumask *cpumask,
static inline enum uv_system_type get_uv_system_type(void) { return UV_NONE; }
static inline bool is_early_uv_system(void) { return 0; }
static inline int is_uv_system(void) { return 0; }
+static inline int is_uv_hubbed(int uv) { return 0; }
static inline int is_uv_hubless(int uv) { return 0; }
static inline void uv_cpu_init(void) { }
static inline void uv_system_init(void) { }
diff --git a/arch/x86/kernel/apic/x2apic_uv_x.c b/arch/x86/kernel/apic/x2apic_uv_x.c
index 14554a3..b505905 100644
--- a/arch/x86/kernel/apic/x2apic_uv_x.c
+++ b/arch/x86/kernel/apic/x2apic_uv_x.c
@@ -26,6 +26,7 @@
static DEFINE_PER_CPU(int, x2apic_extra_bits);
static enum uv_system_type uv_system_type;
+static int uv_hubbed_system;
static int uv_hubless_system;
static u64 gru_start_paddr, gru_end_paddr;
static u64 gru_dist_base, gru_first_node_paddr = -1LL, gru_last_node_paddr;
@@ -309,6 +310,24 @@ static int __init uv_acpi_madt_oem_check(char *_oem_id, char *_oem_table_id)
if (uv_hub_info->hub_revision == 0)
goto badbios;
+ switch (uv_hub_info->hub_revision) {
+ case UV4_HUB_REVISION_BASE:
+ uv_hubbed_system = 0x11;
+ break;
+
+ case UV3_HUB_REVISION_BASE:
+ uv_hubbed_system = 0x9;
+ break;
+
+ case UV2_HUB_REVISION_BASE:
+ uv_hubbed_system = 0x5;
+ break;
+
+ case UV1_HUB_REVISION_BASE:
+ uv_hubbed_system = 0x3;
+ break;
+ }
+
pnodeid = early_get_pnodeid();
early_get_apic_socketid_shift();
@@ -359,6 +378,12 @@ int is_uv_system(void)
}
EXPORT_SYMBOL_GPL(is_uv_system);
+int is_uv_hubbed(int uvtype)
+{
+ return (uv_hubbed_system & uvtype);
+}
+EXPORT_SYMBOL_GPL(is_uv_hubbed);
+
int is_uv_hubless(int uvtype)
{
return (uv_hubless_system & uvtype);
@@ -1457,6 +1482,68 @@ static void __init build_socket_tables(void)
}
}
+/* Setup user proc fs files */
+static int proc_hubbed_show(struct seq_file *file, void *data)
+{
+ seq_printf(file, "0x%x\n", uv_hubbed_system);
+ return 0;
+}
+
+static int proc_hubless_show(struct seq_file *file, void *data)
+{
+ seq_printf(file, "0x%x\n", uv_hubless_system);
+ return 0;
+}
+
+static int proc_oemid_show(struct seq_file *file, void *data)
+{
+ seq_printf(file, "%s/%s\n", oem_id, oem_table_id);
+ return 0;
+}
+
+static int proc_hubbed_open(struct inode *inode, struct file *file)
+{
+ return single_open(file, proc_hubbed_show, (void *)NULL);
+}
+
+static int proc_hubless_open(struct inode *inode, struct file *file)
+{
+ return single_open(file, proc_hubless_show, (void *)NULL);
+}
+
+static int proc_oemid_open(struct inode *inode, struct file *file)
+{
+ return single_open(file, proc_oemid_show, (void *)NULL);
+}
+
+/* (struct is "non-const" as open function is set at runtime) */
+static struct file_operations proc_version_fops = {
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = single_release,
+};
+
+static const struct file_operations proc_oemid_fops = {
+ .open = proc_oemid_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = single_release,
+};
+
+static __init void uv_setup_proc_files(int hubless)
+{
+ struct proc_dir_entry *pde;
+ char *name = hubless ? "hubless" : "hubbed";
+
+ pde = proc_mkdir(UV_PROC_NODE, NULL);
+ proc_create("oemid", 0, pde, &proc_oemid_fops);
+ proc_create(name, 0, pde, &proc_version_fops);
+ if (hubless)
+ proc_version_fops.open = proc_hubless_open;
+ else
+ proc_version_fops.open = proc_hubbed_open;
+}
+
/* Initialize UV hubless systems */
static __init int uv_system_init_hubless(void)
{
@@ -1468,6 +1555,10 @@ static __init int uv_system_init_hubless(void)
/* Init kernel/BIOS interface */
rc = uv_bios_init();
+ /* Create user access node if UVsystab available */
+ if (rc >= 0)
+ uv_setup_proc_files(1);
+
return rc;
}
@@ -1596,7 +1687,7 @@ static void __init uv_system_init_hub(void)
uv_nmi_setup();
uv_cpu_init();
uv_scir_register_cpu_notifier();
- proc_mkdir("sgi_uv", NULL);
+ uv_setup_proc_files(0);
/* Register Legacy VGA I/O redirection handler: */
pci_register_set_vga_state(uv_set_vga_state);