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// SPDX-License-Identifier: GPL-2.0
#include <linux/types.h>
#include <linux/version.h>
#include <linux/vmalloc.h>
#include <linux/mm.h>
#include <linux/clockchips.h>
#include <linux/acpi.h>
#include <linux/hyperv.h>
#include <linux/slab.h>
#include <linux/cpuhotplug.h>
#include <linux/minmax.h>
#include <asm/hypervisor.h>
#include <asm/mshyperv.h>
#include <asm/apic.h>
#include <asm/trace/hyperv.h>
/*
* See struct hv_deposit_memory. The first u64 is partition ID, the rest
* are GPAs.
*/
#define HV_DEPOSIT_MAX (HV_HYP_PAGE_SIZE / sizeof(u64) - 1)
/* Deposits exact number of pages. Must be called with interrupts enabled. */
int hv_call_deposit_pages(int node, u64 partition_id, u32 num_pages)
{
struct page **pages, *page;
int *counts;
int num_allocations;
int i, j, page_count;
int order;
u64 status;
int ret;
u64 base_pfn;
struct hv_deposit_memory *input_page;
unsigned long flags;
if (num_pages > HV_DEPOSIT_MAX)
return -E2BIG;
if (!num_pages)
return 0;
/* One buffer for page pointers and counts */
page = alloc_page(GFP_KERNEL);
if (!page)
return -ENOMEM;
pages = page_address(page);
counts = kcalloc(HV_DEPOSIT_MAX, sizeof(int), GFP_KERNEL);
if (!counts) {
free_page((unsigned long)pages);
return -ENOMEM;
}
/* Allocate all the pages before disabling interrupts */
i = 0;
while (num_pages) {
/* Find highest order we can actually allocate */
order = 31 - __builtin_clz(num_pages);
while (1) {
pages[i] = alloc_pages_node(node, GFP_KERNEL, order);
if (pages[i])
break;
if (!order) {
ret = -ENOMEM;
num_allocations = i;
goto err_free_allocations;
}
--order;
}
split_page(pages[i], order);
counts[i] = 1 << order;
num_pages -= counts[i];
i++;
}
num_allocations = i;
local_irq_save(flags);
input_page = *this_cpu_ptr(hyperv_pcpu_input_arg);
input_page->partition_id = partition_id;
/* Populate gpa_page_list - these will fit on the input page */
for (i = 0, page_count = 0; i < num_allocations; ++i) {
base_pfn = page_to_pfn(pages[i]);
for (j = 0; j < counts[i]; ++j, ++page_count)
input_page->gpa_page_list[page_count] = base_pfn + j;
}
status = hv_do_rep_hypercall(HVCALL_DEPOSIT_MEMORY,
page_count, 0, input_page, NULL);
local_irq_restore(flags);
if ((status & HV_HYPERCALL_RESULT_MASK) != HV_STATUS_SUCCESS) {
pr_err("Failed to deposit pages: %lld\n", status);
ret = status;
goto err_free_allocations;
}
ret = 0;
goto free_buf;
err_free_allocations:
for (i = 0; i < num_allocations; ++i) {
base_pfn = page_to_pfn(pages[i]);
for (j = 0; j < counts[i]; ++j)
__free_page(pfn_to_page(base_pfn + j));
}
free_buf:
free_page((unsigned long)pages);
kfree(counts);
return ret;
}
int hv_call_add_logical_proc(int node, u32 lp_index, u32 apic_id)
{
struct hv_add_logical_processor_in *input;
struct hv_add_logical_processor_out *output;
u64 status;
unsigned long flags;
int ret = 0;
int pxm = node_to_pxm(node);
/*
* When adding a logical processor, the hypervisor may return
* HV_STATUS_INSUFFICIENT_MEMORY. When that happens, we deposit more
* pages and retry.
*/
do {
local_irq_save(flags);
input = *this_cpu_ptr(hyperv_pcpu_input_arg);
/* We don't do anything with the output right now */
output = *this_cpu_ptr(hyperv_pcpu_output_arg);
input->lp_index = lp_index;
input->apic_id = apic_id;
input->flags = 0;
input->proximity_domain_info.domain_id = pxm;
input->proximity_domain_info.flags.reserved = 0;
input->proximity_domain_info.flags.proximity_info_valid = 1;
input->proximity_domain_info.flags.proximity_preferred = 1;
status = hv_do_hypercall(HVCALL_ADD_LOGICAL_PROCESSOR,
input, output);
local_irq_restore(flags);
status &= HV_HYPERCALL_RESULT_MASK;
if (status != HV_STATUS_INSUFFICIENT_MEMORY) {
if (status != HV_STATUS_SUCCESS) {
pr_err("%s: cpu %u apic ID %u, %lld\n", __func__,
lp_index, apic_id, status);
ret = status;
}
break;
}
ret = hv_call_deposit_pages(node, hv_current_partition_id, 1);
} while (!ret);
return ret;
}
int hv_call_create_vp(int node, u64 partition_id, u32 vp_index, u32 flags)
{
struct hv_create_vp *input;
u64 status;
unsigned long irq_flags;
int ret = 0;
int pxm = node_to_pxm(node);
/* Root VPs don't seem to need pages deposited */
if (partition_id != hv_current_partition_id) {
/* The value 90 is empirically determined. It may change. */
ret = hv_call_deposit_pages(node, partition_id, 90);
if (ret)
return ret;
}
do {
local_irq_save(irq_flags);
input = *this_cpu_ptr(hyperv_pcpu_input_arg);
input->partition_id = partition_id;
input->vp_index = vp_index;
input->flags = flags;
input->subnode_type = HvSubnodeAny;
if (node != NUMA_NO_NODE) {
input->proximity_domain_info.domain_id = pxm;
input->proximity_domain_info.flags.reserved = 0;
input->proximity_domain_info.flags.proximity_info_valid = 1;
input->proximity_domain_info.flags.proximity_preferred = 1;
} else {
input->proximity_domain_info.as_uint64 = 0;
}
status = hv_do_hypercall(HVCALL_CREATE_VP, input, NULL);
local_irq_restore(irq_flags);
status &= HV_HYPERCALL_RESULT_MASK;
if (status != HV_STATUS_INSUFFICIENT_MEMORY) {
if (status != HV_STATUS_SUCCESS) {
pr_err("%s: vcpu %u, lp %u, %lld\n", __func__,
vp_index, flags, status);
ret = status;
}
break;
}
ret = hv_call_deposit_pages(node, partition_id, 1);
} while (!ret);
return ret;
}
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