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Diffstat (limited to 'arch/x86/kernel/aperture_64.c')
-rw-r--r--arch/x86/kernel/aperture_64.c416
1 files changed, 251 insertions, 165 deletions
diff --git a/arch/x86/kernel/aperture_64.c b/arch/x86/kernel/aperture_64.c
index 00df126169b..76164e173a2 100644
--- a/arch/x86/kernel/aperture_64.c
+++ b/arch/x86/kernel/aperture_64.c
@@ -1,62 +1,71 @@
/*
* Firmware replacement code.
*
- * Work around broken BIOSes that don't set an aperture or only set the
- * aperture in the AGP bridge.
+ * Work around broken BIOSes that don't set an aperture, only set the
+ * aperture in the AGP bridge, or set too small aperture.
+ *
* If all fails map the aperture over some low memory. This is cheaper than
* doing bounce buffering. The memory is lost. This is done at early boot
* because only the bootmem allocator can allocate 32+MB.
*
* Copyright 2002 Andi Kleen, SuSE Labs.
*/
+#define pr_fmt(fmt) "AGP: " fmt
+
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/init.h>
-#include <linux/bootmem.h>
+#include <linux/memblock.h>
#include <linux/mmzone.h>
#include <linux/pci_ids.h>
#include <linux/pci.h>
#include <linux/bitops.h>
-#include <linux/ioport.h>
#include <linux/suspend.h>
#include <asm/e820.h>
#include <asm/io.h>
+#include <asm/iommu.h>
#include <asm/gart.h>
#include <asm/pci-direct.h>
#include <asm/dma.h>
-#include <asm/k8.h>
+#include <asm/amd_nb.h>
+#include <asm/x86_init.h>
+
+/*
+ * Using 512M as goal, in case kexec will load kernel_big
+ * that will do the on-position decompress, and could overlap with
+ * with the gart aperture that is used.
+ * Sequence:
+ * kernel_small
+ * ==> kexec (with kdump trigger path or gart still enabled)
+ * ==> kernel_small (gart area become e820_reserved)
+ * ==> kexec (with kdump trigger path or gart still enabled)
+ * ==> kerne_big (uncompressed size will be big than 64M or 128M)
+ * So don't use 512M below as gart iommu, leave the space for kernel
+ * code for safe.
+ */
+#define GART_MIN_ADDR (512ULL << 20)
+#define GART_MAX_ADDR (1ULL << 32)
int gart_iommu_aperture;
-int gart_iommu_aperture_disabled __initdata = 0;
-int gart_iommu_aperture_allowed __initdata = 0;
+int gart_iommu_aperture_disabled __initdata;
+int gart_iommu_aperture_allowed __initdata;
int fallback_aper_order __initdata = 1; /* 64MB */
-int fallback_aper_force __initdata = 0;
+int fallback_aper_force __initdata;
int fix_aperture __initdata = 1;
-static struct resource gart_resource = {
- .name = "GART",
- .flags = IORESOURCE_MEM,
-};
-
-static void __init insert_aperture_resource(u32 aper_base, u32 aper_size)
-{
- gart_resource.start = aper_base;
- gart_resource.end = aper_base + aper_size - 1;
- insert_resource(&iomem_resource, &gart_resource);
-}
-
/* This code runs before the PCI subsystem is initialized, so just
access the northbridge directly. */
static u32 __init allocate_aperture(void)
{
u32 aper_size;
- void *p;
+ unsigned long addr;
- if (fallback_aper_order > 7)
- fallback_aper_order = 7;
+ /* aper_size should <= 1G */
+ if (fallback_aper_order > 5)
+ fallback_aper_order = 5;
aper_size = (32 * 1024 * 1024) << fallback_aper_order;
/*
@@ -65,87 +74,70 @@ static u32 __init allocate_aperture(void)
* memory. Unfortunately we cannot move it up because that would
* make the IOMMU useless.
*/
- p = __alloc_bootmem_nopanic(aper_size, aper_size, 0);
- if (!p || __pa(p)+aper_size > 0xffffffff) {
- printk(KERN_ERR
- "Cannot allocate aperture memory hole (%p,%uK)\n",
- p, aper_size>>10);
- if (p)
- free_bootmem(__pa(p), aper_size);
+ addr = memblock_find_in_range(GART_MIN_ADDR, GART_MAX_ADDR,
+ aper_size, aper_size);
+ if (!addr) {
+ pr_err("Cannot allocate aperture memory hole [mem %#010lx-%#010lx] (%uKB)\n",
+ addr, addr + aper_size - 1, aper_size >> 10);
return 0;
}
- printk(KERN_INFO "Mapping aperture over %d KB of RAM @ %lx\n",
- aper_size >> 10, __pa(p));
- insert_aperture_resource((u32)__pa(p), aper_size);
- register_nosave_region((u32)__pa(p) >> PAGE_SHIFT,
- (u32)__pa(p+aper_size) >> PAGE_SHIFT);
+ memblock_reserve(addr, aper_size);
+ pr_info("Mapping aperture over RAM [mem %#010lx-%#010lx] (%uKB)\n",
+ addr, addr + aper_size - 1, aper_size >> 10);
+ register_nosave_region(addr >> PAGE_SHIFT,
+ (addr+aper_size) >> PAGE_SHIFT);
- return (u32)__pa(p);
+ return (u32)addr;
}
-static int __init aperture_valid(u64 aper_base, u32 aper_size)
-{
- if (!aper_base)
- return 0;
-
- if (aper_base + aper_size > 0x100000000UL) {
- printk(KERN_ERR "Aperture beyond 4GB. Ignoring.\n");
- return 0;
- }
- if (e820_any_mapped(aper_base, aper_base + aper_size, E820_RAM)) {
- printk(KERN_ERR "Aperture pointing to e820 RAM. Ignoring.\n");
- return 0;
- }
- if (aper_size < 64*1024*1024) {
- printk(KERN_ERR "Aperture too small (%d MB)\n", aper_size>>20);
- return 0;
- }
-
- return 1;
-}
/* Find a PCI capability */
-static __u32 __init find_cap(int num, int slot, int func, int cap)
+static u32 __init find_cap(int bus, int slot, int func, int cap)
{
int bytes;
u8 pos;
- if (!(read_pci_config_16(num, slot, func, PCI_STATUS) &
+ if (!(read_pci_config_16(bus, slot, func, PCI_STATUS) &
PCI_STATUS_CAP_LIST))
return 0;
- pos = read_pci_config_byte(num, slot, func, PCI_CAPABILITY_LIST);
+ pos = read_pci_config_byte(bus, slot, func, PCI_CAPABILITY_LIST);
for (bytes = 0; bytes < 48 && pos >= 0x40; bytes++) {
u8 id;
pos &= ~3;
- id = read_pci_config_byte(num, slot, func, pos+PCI_CAP_LIST_ID);
+ id = read_pci_config_byte(bus, slot, func, pos+PCI_CAP_LIST_ID);
if (id == 0xff)
break;
if (id == cap)
return pos;
- pos = read_pci_config_byte(num, slot, func,
+ pos = read_pci_config_byte(bus, slot, func,
pos+PCI_CAP_LIST_NEXT);
}
return 0;
}
/* Read a standard AGPv3 bridge header */
-static __u32 __init read_agp(int num, int slot, int func, int cap, u32 *order)
+static u32 __init read_agp(int bus, int slot, int func, int cap, u32 *order)
{
u32 apsize;
u32 apsizereg;
int nbits;
u32 aper_low, aper_hi;
u64 aper;
+ u32 old_order;
- printk(KERN_INFO "AGP bridge at %02x:%02x:%02x\n", num, slot, func);
- apsizereg = read_pci_config_16(num, slot, func, cap + 0x14);
+ pr_info("pci 0000:%02x:%02x:%02x: AGP bridge\n", bus, slot, func);
+ apsizereg = read_pci_config_16(bus, slot, func, cap + 0x14);
if (apsizereg == 0xffffffff) {
- printk(KERN_ERR "APSIZE in AGP bridge unreadable\n");
+ pr_err("pci 0000:%02x:%02x.%d: APSIZE unreadable\n",
+ bus, slot, func);
return 0;
}
+ /* old_order could be the value from NB gart setting */
+ old_order = *order;
+
apsize = apsizereg & 0xfff;
/* Some BIOS use weird encodings not in the AGPv3 table. */
if (apsize & 0xff)
@@ -155,14 +147,28 @@ static __u32 __init read_agp(int num, int slot, int func, int cap, u32 *order)
if ((int)*order < 0) /* < 32MB */
*order = 0;
- aper_low = read_pci_config(num, slot, func, 0x10);
- aper_hi = read_pci_config(num, slot, func, 0x14);
+ aper_low = read_pci_config(bus, slot, func, 0x10);
+ aper_hi = read_pci_config(bus, slot, func, 0x14);
aper = (aper_low & ~((1<<22)-1)) | ((u64)aper_hi << 32);
- printk(KERN_INFO "Aperture from AGP @ %Lx size %u MB (APSIZE %x)\n",
- aper, 32 << *order, apsizereg);
+ /*
+ * On some sick chips, APSIZE is 0. It means it wants 4G
+ * so let double check that order, and lets trust AMD NB settings:
+ */
+ pr_info("pci 0000:%02x:%02x.%d: AGP aperture [bus addr %#010Lx-%#010Lx] (old size %uMB)\n",
+ bus, slot, func, aper, aper + (32ULL << (old_order + 20)) - 1,
+ 32 << old_order);
+ if (aper + (32ULL<<(20 + *order)) > 0x100000000ULL) {
+ pr_info("pci 0000:%02x:%02x.%d: AGP aperture size %uMB (APSIZE %#x) is not right, using settings from NB\n",
+ bus, slot, func, 32 << *order, apsizereg);
+ *order = old_order;
+ }
+
+ pr_info("pci 0000:%02x:%02x.%d: AGP aperture [bus addr %#010Lx-%#010Lx] (%uMB, APSIZE %#x)\n",
+ bus, slot, func, aper, aper + (32ULL << (*order + 20)) - 1,
+ 32 << *order, apsizereg);
- if (!aperture_valid(aper, (32*1024*1024) << *order))
+ if (!aperture_valid(aper, (32*1024*1024) << *order, 32<<20))
return 0;
return (u32)aper;
}
@@ -175,22 +181,22 @@ static __u32 __init read_agp(int num, int slot, int func, int cap, u32 *order)
* Do an PCI bus scan by hand because we're running before the PCI
* subsystem.
*
- * All K8 AGP bridges are AGPv3 compliant, so we can do this scan
+ * All AMD AGP bridges are AGPv3 compliant, so we can do this scan
* generically. It's probably overkill to always scan all slots because
* the AGP bridges should be always an own bus on the HT hierarchy,
* but do it here for future safety.
*/
-static __u32 __init search_agp_bridge(u32 *order, int *valid_agp)
+static u32 __init search_agp_bridge(u32 *order, int *valid_agp)
{
- int num, slot, func;
+ int bus, slot, func;
/* Poor man's PCI discovery */
- for (num = 0; num < 256; num++) {
+ for (bus = 0; bus < 256; bus++) {
for (slot = 0; slot < 32; slot++) {
for (func = 0; func < 8; func++) {
u32 class, cap;
u8 type;
- class = read_pci_config(num, slot, func,
+ class = read_pci_config(bus, slot, func,
PCI_CLASS_REVISION);
if (class == 0xffffffff)
break;
@@ -199,24 +205,24 @@ static __u32 __init search_agp_bridge(u32 *order, int *valid_agp)
case PCI_CLASS_BRIDGE_HOST:
case PCI_CLASS_BRIDGE_OTHER: /* needed? */
/* AGP bridge? */
- cap = find_cap(num, slot, func,
+ cap = find_cap(bus, slot, func,
PCI_CAP_ID_AGP);
if (!cap)
break;
*valid_agp = 1;
- return read_agp(num, slot, func, cap,
+ return read_agp(bus, slot, func, cap,
order);
}
/* No multi-function device? */
- type = read_pci_config_byte(num, slot, func,
+ type = read_pci_config_byte(bus, slot, func,
PCI_HEADER_TYPE);
if (!(type & 0x80))
break;
}
}
}
- printk(KERN_INFO "No AGP bridge found\n");
+ pr_info("No AGP bridge found\n");
return 0;
}
@@ -249,36 +255,53 @@ void __init early_gart_iommu_check(void)
* or BIOS forget to put that in reserved.
* try to update e820 to make that region as reserved.
*/
- int fix, num;
+ u32 agp_aper_order = 0;
+ int i, fix, slot, valid_agp = 0;
u32 ctl;
u32 aper_size = 0, aper_order = 0, last_aper_order = 0;
u64 aper_base = 0, last_aper_base = 0;
- int aper_enabled = 0, last_aper_enabled = 0;
+ int aper_enabled = 0, last_aper_enabled = 0, last_valid = 0;
if (!early_pci_allowed())
return;
+ /* This is mostly duplicate of iommu_hole_init */
+ search_agp_bridge(&agp_aper_order, &valid_agp);
+
fix = 0;
- for (num = 24; num < 32; num++) {
- if (!early_is_k8_nb(read_pci_config(0, num, 3, 0x00)))
- continue;
-
- ctl = read_pci_config(0, num, 3, 0x90);
- aper_enabled = ctl & 1;
- aper_order = (ctl >> 1) & 7;
- aper_size = (32 * 1024 * 1024) << aper_order;
- aper_base = read_pci_config(0, num, 3, 0x94) & 0x7fff;
- aper_base <<= 25;
-
- if ((last_aper_order && aper_order != last_aper_order) ||
- (last_aper_base && aper_base != last_aper_base) ||
- (last_aper_enabled && aper_enabled != last_aper_enabled)) {
- fix = 1;
- break;
+ for (i = 0; amd_nb_bus_dev_ranges[i].dev_limit; i++) {
+ int bus;
+ int dev_base, dev_limit;
+
+ bus = amd_nb_bus_dev_ranges[i].bus;
+ dev_base = amd_nb_bus_dev_ranges[i].dev_base;
+ dev_limit = amd_nb_bus_dev_ranges[i].dev_limit;
+
+ for (slot = dev_base; slot < dev_limit; slot++) {
+ if (!early_is_amd_nb(read_pci_config(bus, slot, 3, 0x00)))
+ continue;
+
+ ctl = read_pci_config(bus, slot, 3, AMD64_GARTAPERTURECTL);
+ aper_enabled = ctl & GARTEN;
+ aper_order = (ctl >> 1) & 7;
+ aper_size = (32 * 1024 * 1024) << aper_order;
+ aper_base = read_pci_config(bus, slot, 3, AMD64_GARTAPERTUREBASE) & 0x7fff;
+ aper_base <<= 25;
+
+ if (last_valid) {
+ if ((aper_order != last_aper_order) ||
+ (aper_base != last_aper_base) ||
+ (aper_enabled != last_aper_enabled)) {
+ fix = 1;
+ break;
+ }
+ }
+
+ last_aper_order = aper_order;
+ last_aper_base = aper_base;
+ last_aper_enabled = aper_enabled;
+ last_valid = 1;
}
- last_aper_order = aper_order;
- last_aper_base = aper_base;
- last_aper_enabled = aper_enabled;
}
if (!fix && !aper_enabled)
@@ -290,98 +313,149 @@ void __init early_gart_iommu_check(void)
if (gart_fix_e820 && !fix && aper_enabled) {
if (e820_any_mapped(aper_base, aper_base + aper_size,
E820_RAM)) {
- /* reserved it, so we can resuse it in second kernel */
- printk(KERN_INFO "update e820 for GART\n");
- add_memory_region(aper_base, aper_size, E820_RESERVED);
+ /* reserve it, so we can reuse it in second kernel */
+ pr_info("e820: reserve [mem %#010Lx-%#010Lx] for GART\n",
+ aper_base, aper_base + aper_size - 1);
+ e820_add_region(aper_base, aper_size, E820_RESERVED);
update_e820();
}
- return;
}
- /* different nodes have different setting, disable them all at first*/
- for (num = 24; num < 32; num++) {
- if (!early_is_k8_nb(read_pci_config(0, num, 3, 0x00)))
- continue;
+ if (valid_agp)
+ return;
+
+ /* disable them all at first */
+ for (i = 0; i < amd_nb_bus_dev_ranges[i].dev_limit; i++) {
+ int bus;
+ int dev_base, dev_limit;
+
+ bus = amd_nb_bus_dev_ranges[i].bus;
+ dev_base = amd_nb_bus_dev_ranges[i].dev_base;
+ dev_limit = amd_nb_bus_dev_ranges[i].dev_limit;
+
+ for (slot = dev_base; slot < dev_limit; slot++) {
+ if (!early_is_amd_nb(read_pci_config(bus, slot, 3, 0x00)))
+ continue;
- ctl = read_pci_config(0, num, 3, 0x90);
- ctl &= ~1;
- write_pci_config(0, num, 3, 0x90, ctl);
+ ctl = read_pci_config(bus, slot, 3, AMD64_GARTAPERTURECTL);
+ ctl &= ~GARTEN;
+ write_pci_config(bus, slot, 3, AMD64_GARTAPERTURECTL, ctl);
+ }
}
}
-void __init gart_iommu_hole_init(void)
+static int __initdata printed_gart_size_msg;
+
+int __init gart_iommu_hole_init(void)
{
+ u32 agp_aper_base = 0, agp_aper_order = 0;
u32 aper_size, aper_alloc = 0, aper_order = 0, last_aper_order = 0;
u64 aper_base, last_aper_base = 0;
- int fix, num, valid_agp = 0;
- int node;
+ int fix, slot, valid_agp = 0;
+ int i, node;
if (gart_iommu_aperture_disabled || !fix_aperture ||
!early_pci_allowed())
- return;
+ return -ENODEV;
+
+ pr_info("Checking aperture...\n");
- printk(KERN_INFO "Checking aperture...\n");
+ if (!fallback_aper_force)
+ agp_aper_base = search_agp_bridge(&agp_aper_order, &valid_agp);
fix = 0;
node = 0;
- for (num = 24; num < 32; num++) {
- if (!early_is_k8_nb(read_pci_config(0, num, 3, 0x00)))
- continue;
+ for (i = 0; i < amd_nb_bus_dev_ranges[i].dev_limit; i++) {
+ int bus;
+ int dev_base, dev_limit;
+ u32 ctl;
- iommu_detected = 1;
- gart_iommu_aperture = 1;
+ bus = amd_nb_bus_dev_ranges[i].bus;
+ dev_base = amd_nb_bus_dev_ranges[i].dev_base;
+ dev_limit = amd_nb_bus_dev_ranges[i].dev_limit;
- aper_order = (read_pci_config(0, num, 3, 0x90) >> 1) & 7;
- aper_size = (32 * 1024 * 1024) << aper_order;
- aper_base = read_pci_config(0, num, 3, 0x94) & 0x7fff;
- aper_base <<= 25;
+ for (slot = dev_base; slot < dev_limit; slot++) {
+ if (!early_is_amd_nb(read_pci_config(bus, slot, 3, 0x00)))
+ continue;
- printk(KERN_INFO "Node %d: aperture @ %Lx size %u MB\n",
- node, aper_base, aper_size >> 20);
- node++;
+ iommu_detected = 1;
+ gart_iommu_aperture = 1;
+ x86_init.iommu.iommu_init = gart_iommu_init;
- if (!aperture_valid(aper_base, aper_size)) {
- fix = 1;
- break;
- }
+ ctl = read_pci_config(bus, slot, 3,
+ AMD64_GARTAPERTURECTL);
- if ((last_aper_order && aper_order != last_aper_order) ||
- (last_aper_base && aper_base != last_aper_base)) {
- fix = 1;
- break;
+ /*
+ * Before we do anything else disable the GART. It may
+ * still be enabled if we boot into a crash-kernel here.
+ * Reconfiguring the GART while it is enabled could have
+ * unknown side-effects.
+ */
+ ctl &= ~GARTEN;
+ write_pci_config(bus, slot, 3, AMD64_GARTAPERTURECTL, ctl);
+
+ aper_order = (ctl >> 1) & 7;
+ aper_size = (32 * 1024 * 1024) << aper_order;
+ aper_base = read_pci_config(bus, slot, 3, AMD64_GARTAPERTUREBASE) & 0x7fff;
+ aper_base <<= 25;
+
+ pr_info("Node %d: aperture [bus addr %#010Lx-%#010Lx] (%uMB)\n",
+ node, aper_base, aper_base + aper_size - 1,
+ aper_size >> 20);
+ node++;
+
+ if (!aperture_valid(aper_base, aper_size, 64<<20)) {
+ if (valid_agp && agp_aper_base &&
+ agp_aper_base == aper_base &&
+ agp_aper_order == aper_order) {
+ /* the same between two setting from NB and agp */
+ if (!no_iommu &&
+ max_pfn > MAX_DMA32_PFN &&
+ !printed_gart_size_msg) {
+ pr_err("you are using iommu with agp, but GART size is less than 64MB\n");
+ pr_err("please increase GART size in your BIOS setup\n");
+ pr_err("if BIOS doesn't have that option, contact your HW vendor!\n");
+ printed_gart_size_msg = 1;
+ }
+ } else {
+ fix = 1;
+ goto out;
+ }
+ }
+
+ if ((last_aper_order && aper_order != last_aper_order) ||
+ (last_aper_base && aper_base != last_aper_base)) {
+ fix = 1;
+ goto out;
+ }
+ last_aper_order = aper_order;
+ last_aper_base = aper_base;
}
- last_aper_order = aper_order;
- last_aper_base = aper_base;
}
+out:
if (!fix && !fallback_aper_force) {
- if (last_aper_base) {
- unsigned long n = (32 * 1024 * 1024) << last_aper_order;
-
- insert_aperture_resource((u32)last_aper_base, n);
- }
- return;
+ if (last_aper_base)
+ return 1;
+ return 0;
}
- if (!fallback_aper_force)
- aper_alloc = search_agp_bridge(&aper_order, &valid_agp);
+ if (!fallback_aper_force) {
+ aper_alloc = agp_aper_base;
+ aper_order = agp_aper_order;
+ }
if (aper_alloc) {
/* Got the aperture from the AGP bridge */
- } else if (swiotlb && !valid_agp) {
- /* Do nothing */
- } else if ((!no_iommu && end_pfn > MAX_DMA32_PFN) ||
+ } else if ((!no_iommu && max_pfn > MAX_DMA32_PFN) ||
force_iommu ||
valid_agp ||
fallback_aper_force) {
- printk(KERN_ERR
- "Your BIOS doesn't leave a aperture memory hole\n");
- printk(KERN_ERR
- "Please enable the IOMMU option in the BIOS setup\n");
- printk(KERN_ERR
- "This costs you %d MB of RAM\n",
- 32 << fallback_aper_order);
+ pr_info("Your BIOS doesn't leave a aperture memory hole\n");
+ pr_info("Please enable the IOMMU option in the BIOS setup\n");
+ pr_info("This costs you %dMB of RAM\n",
+ 32 << fallback_aper_order);
aper_order = fallback_aper_order;
aper_alloc = allocate_aperture();
@@ -397,20 +471,32 @@ void __init gart_iommu_hole_init(void)
panic("Not enough memory for aperture");
}
} else {
- return;
+ return 0;
}
/* Fix up the north bridges */
- for (num = 24; num < 32; num++) {
- if (!early_is_k8_nb(read_pci_config(0, num, 3, 0x00)))
- continue;
+ for (i = 0; i < amd_nb_bus_dev_ranges[i].dev_limit; i++) {
+ int bus, dev_base, dev_limit;
/*
- * Don't enable translation yet. That is done later.
- * Assume this BIOS didn't initialise the GART so
- * just overwrite all previous bits
+ * Don't enable translation yet but enable GART IO and CPU
+ * accesses and set DISTLBWALKPRB since GART table memory is UC.
*/
- write_pci_config(0, num, 3, 0x90, aper_order<<1);
- write_pci_config(0, num, 3, 0x94, aper_alloc>>25);
+ u32 ctl = aper_order << 1;
+
+ bus = amd_nb_bus_dev_ranges[i].bus;
+ dev_base = amd_nb_bus_dev_ranges[i].dev_base;
+ dev_limit = amd_nb_bus_dev_ranges[i].dev_limit;
+ for (slot = dev_base; slot < dev_limit; slot++) {
+ if (!early_is_amd_nb(read_pci_config(bus, slot, 3, 0x00)))
+ continue;
+
+ write_pci_config(bus, slot, 3, AMD64_GARTAPERTURECTL, ctl);
+ write_pci_config(bus, slot, 3, AMD64_GARTAPERTUREBASE, aper_alloc >> 25);
+ }
}
+
+ set_up_gart_resume(aper_order, aper_alloc);
+
+ return 1;
}
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-11-10 14:48:06 +0000