^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0-only
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * Copyright (c) 2009, Microsoft Corporation.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * Authors:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) * Haiyang Zhang <haiyangz@microsoft.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) * Hank Janssen <hjanssen@microsoft.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/sched.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/wait.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/mm.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <linux/hyperv.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #include <linux/uio.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #include <linux/interrupt.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) #include <asm/page.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) #include <asm/mshyperv.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) #include "hyperv_vmbus.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) * hv_gpadl_size - Return the real size of a gpadl, the size that Hyper-V uses
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) * For BUFFER gpadl, Hyper-V uses the exact same size as the guest does.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) * For RING gpadl, in each ring, the guest uses one PAGE_SIZE as the header
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) * (because of the alignment requirement), however, the hypervisor only
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) * uses the first HV_HYP_PAGE_SIZE as the header, therefore leaving a
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) * (PAGE_SIZE - HV_HYP_PAGE_SIZE) gap. And since there are two rings in a
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) * ringbuffer, the total size for a RING gpadl that Hyper-V uses is the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) * total size that the guest uses minus twice of the gap size.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) static inline u32 hv_gpadl_size(enum hv_gpadl_type type, u32 size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) switch (type) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) case HV_GPADL_BUFFER:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) return size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) case HV_GPADL_RING:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) /* The size of a ringbuffer must be page-aligned */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) BUG_ON(size % PAGE_SIZE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) * Two things to notice here:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) * 1) We're processing two ring buffers as a unit
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) * 2) We're skipping any space larger than HV_HYP_PAGE_SIZE in
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) * the first guest-size page of each of the two ring buffers.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) * So we effectively subtract out two guest-size pages, and add
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) * back two Hyper-V size pages.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) return size - 2 * (PAGE_SIZE - HV_HYP_PAGE_SIZE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) BUG();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) * hv_ring_gpadl_send_hvpgoffset - Calculate the send offset (in unit of
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) * HV_HYP_PAGE) in a ring gpadl based on the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) * offset in the guest
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) * @offset: the offset (in bytes) where the send ringbuffer starts in the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) * virtual address space of the guest
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) static inline u32 hv_ring_gpadl_send_hvpgoffset(u32 offset)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) * For RING gpadl, in each ring, the guest uses one PAGE_SIZE as the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) * header (because of the alignment requirement), however, the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) * hypervisor only uses the first HV_HYP_PAGE_SIZE as the header,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) * therefore leaving a (PAGE_SIZE - HV_HYP_PAGE_SIZE) gap.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) * And to calculate the effective send offset in gpadl, we need to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) * substract this gap.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) return (offset - (PAGE_SIZE - HV_HYP_PAGE_SIZE)) >> HV_HYP_PAGE_SHIFT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) * hv_gpadl_hvpfn - Return the Hyper-V page PFN of the @i th Hyper-V page in
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) * the gpadl
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) * @type: the type of the gpadl
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) * @kbuffer: the pointer to the gpadl in the guest
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) * @size: the total size (in bytes) of the gpadl
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) * @send_offset: the offset (in bytes) where the send ringbuffer starts in the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) * virtual address space of the guest
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) * @i: the index
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) static inline u64 hv_gpadl_hvpfn(enum hv_gpadl_type type, void *kbuffer,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) u32 size, u32 send_offset, int i)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) int send_idx = hv_ring_gpadl_send_hvpgoffset(send_offset);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) unsigned long delta = 0UL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) switch (type) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) case HV_GPADL_BUFFER:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) case HV_GPADL_RING:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) if (i == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) delta = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) else if (i <= send_idx)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) delta = PAGE_SIZE - HV_HYP_PAGE_SIZE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) delta = 2 * (PAGE_SIZE - HV_HYP_PAGE_SIZE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) BUG();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) return virt_to_hvpfn(kbuffer + delta + (HV_HYP_PAGE_SIZE * i));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) * vmbus_setevent- Trigger an event notification on the specified
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) * channel.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) void vmbus_setevent(struct vmbus_channel *channel)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) struct hv_monitor_page *monitorpage;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) trace_vmbus_setevent(channel);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) * For channels marked as in "low latency" mode
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) * bypass the monitor page mechanism.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) if (channel->offermsg.monitor_allocated && !channel->low_latency) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) vmbus_send_interrupt(channel->offermsg.child_relid);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) /* Get the child to parent monitor page */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) monitorpage = vmbus_connection.monitor_pages[1];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) sync_set_bit(channel->monitor_bit,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) (unsigned long *)&monitorpage->trigger_group
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) [channel->monitor_grp].pending);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) vmbus_set_event(channel);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) EXPORT_SYMBOL_GPL(vmbus_setevent);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) /* vmbus_free_ring - drop mapping of ring buffer */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) void vmbus_free_ring(struct vmbus_channel *channel)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) hv_ringbuffer_cleanup(&channel->outbound);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) hv_ringbuffer_cleanup(&channel->inbound);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) if (channel->ringbuffer_page) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) __free_pages(channel->ringbuffer_page,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) get_order(channel->ringbuffer_pagecount
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) << PAGE_SHIFT));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) channel->ringbuffer_page = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) EXPORT_SYMBOL_GPL(vmbus_free_ring);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) /* vmbus_alloc_ring - allocate and map pages for ring buffer */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) int vmbus_alloc_ring(struct vmbus_channel *newchannel,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) u32 send_size, u32 recv_size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) struct page *page;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) int order;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) if (send_size % PAGE_SIZE || recv_size % PAGE_SIZE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) /* Allocate the ring buffer */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) order = get_order(send_size + recv_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) page = alloc_pages_node(cpu_to_node(newchannel->target_cpu),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) GFP_KERNEL|__GFP_ZERO, order);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) if (!page)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) page = alloc_pages(GFP_KERNEL|__GFP_ZERO, order);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) if (!page)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) newchannel->ringbuffer_page = page;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) newchannel->ringbuffer_pagecount = (send_size + recv_size) >> PAGE_SHIFT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) newchannel->ringbuffer_send_offset = send_size >> PAGE_SHIFT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) EXPORT_SYMBOL_GPL(vmbus_alloc_ring);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) /* Used for Hyper-V Socket: a guest client's connect() to the host */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) int vmbus_send_tl_connect_request(const guid_t *shv_guest_servie_id,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) const guid_t *shv_host_servie_id)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) struct vmbus_channel_tl_connect_request conn_msg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) memset(&conn_msg, 0, sizeof(conn_msg));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) conn_msg.header.msgtype = CHANNELMSG_TL_CONNECT_REQUEST;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) conn_msg.guest_endpoint_id = *shv_guest_servie_id;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) conn_msg.host_service_id = *shv_host_servie_id;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) ret = vmbus_post_msg(&conn_msg, sizeof(conn_msg), true);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) trace_vmbus_send_tl_connect_request(&conn_msg, ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) EXPORT_SYMBOL_GPL(vmbus_send_tl_connect_request);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) * Set/change the vCPU (@target_vp) the channel (@child_relid) will interrupt.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) * CHANNELMSG_MODIFYCHANNEL messages are aynchronous. Also, Hyper-V does not
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) * ACK such messages. IOW we can't know when the host will stop interrupting
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) * the "old" vCPU and start interrupting the "new" vCPU for the given channel.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) * The CHANNELMSG_MODIFYCHANNEL message type is supported since VMBus version
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) * VERSION_WIN10_V4_1.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) int vmbus_send_modifychannel(u32 child_relid, u32 target_vp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) struct vmbus_channel_modifychannel conn_msg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) memset(&conn_msg, 0, sizeof(conn_msg));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) conn_msg.header.msgtype = CHANNELMSG_MODIFYCHANNEL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) conn_msg.child_relid = child_relid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) conn_msg.target_vp = target_vp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) ret = vmbus_post_msg(&conn_msg, sizeof(conn_msg), true);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) trace_vmbus_send_modifychannel(&conn_msg, ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) EXPORT_SYMBOL_GPL(vmbus_send_modifychannel);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) * create_gpadl_header - Creates a gpadl for the specified buffer
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) static int create_gpadl_header(enum hv_gpadl_type type, void *kbuffer,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) u32 size, u32 send_offset,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) struct vmbus_channel_msginfo **msginfo)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) int pagecount;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) struct vmbus_channel_gpadl_header *gpadl_header;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) struct vmbus_channel_gpadl_body *gpadl_body;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) struct vmbus_channel_msginfo *msgheader;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) struct vmbus_channel_msginfo *msgbody = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) u32 msgsize;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) int pfnsum, pfncount, pfnleft, pfncurr, pfnsize;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) pagecount = hv_gpadl_size(type, size) >> HV_HYP_PAGE_SHIFT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) /* do we need a gpadl body msg */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) pfnsize = MAX_SIZE_CHANNEL_MESSAGE -
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) sizeof(struct vmbus_channel_gpadl_header) -
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) sizeof(struct gpa_range);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) pfncount = pfnsize / sizeof(u64);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) if (pagecount > pfncount) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) /* we need a gpadl body */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) /* fill in the header */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) msgsize = sizeof(struct vmbus_channel_msginfo) +
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) sizeof(struct vmbus_channel_gpadl_header) +
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) sizeof(struct gpa_range) + pfncount * sizeof(u64);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) msgheader = kzalloc(msgsize, GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) if (!msgheader)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) goto nomem;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) INIT_LIST_HEAD(&msgheader->submsglist);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) msgheader->msgsize = msgsize;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) gpadl_header = (struct vmbus_channel_gpadl_header *)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) msgheader->msg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) gpadl_header->rangecount = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) gpadl_header->range_buflen = sizeof(struct gpa_range) +
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) pagecount * sizeof(u64);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) gpadl_header->range[0].byte_offset = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) gpadl_header->range[0].byte_count = hv_gpadl_size(type, size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) for (i = 0; i < pfncount; i++)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) gpadl_header->range[0].pfn_array[i] = hv_gpadl_hvpfn(
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) type, kbuffer, size, send_offset, i);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) *msginfo = msgheader;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) pfnsum = pfncount;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) pfnleft = pagecount - pfncount;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) /* how many pfns can we fit */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) pfnsize = MAX_SIZE_CHANNEL_MESSAGE -
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) sizeof(struct vmbus_channel_gpadl_body);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) pfncount = pfnsize / sizeof(u64);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) /* fill in the body */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) while (pfnleft) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) if (pfnleft > pfncount)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) pfncurr = pfncount;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) pfncurr = pfnleft;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) msgsize = sizeof(struct vmbus_channel_msginfo) +
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) sizeof(struct vmbus_channel_gpadl_body) +
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) pfncurr * sizeof(u64);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) msgbody = kzalloc(msgsize, GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) if (!msgbody) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) struct vmbus_channel_msginfo *pos = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) struct vmbus_channel_msginfo *tmp = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) * Free up all the allocated messages.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) list_for_each_entry_safe(pos, tmp,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) &msgheader->submsglist,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) msglistentry) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) list_del(&pos->msglistentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) kfree(pos);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) goto nomem;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) msgbody->msgsize = msgsize;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) gpadl_body =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) (struct vmbus_channel_gpadl_body *)msgbody->msg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) * Gpadl is u32 and we are using a pointer which could
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) * be 64-bit
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) * This is governed by the guest/host protocol and
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) * so the hypervisor guarantees that this is ok.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) for (i = 0; i < pfncurr; i++)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) gpadl_body->pfn[i] = hv_gpadl_hvpfn(type,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) kbuffer, size, send_offset, pfnsum + i);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) /* add to msg header */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) list_add_tail(&msgbody->msglistentry,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) &msgheader->submsglist);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) pfnsum += pfncurr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) pfnleft -= pfncurr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) /* everything fits in a header */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) msgsize = sizeof(struct vmbus_channel_msginfo) +
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) sizeof(struct vmbus_channel_gpadl_header) +
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) sizeof(struct gpa_range) + pagecount * sizeof(u64);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) msgheader = kzalloc(msgsize, GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) if (msgheader == NULL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) goto nomem;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) INIT_LIST_HEAD(&msgheader->submsglist);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) msgheader->msgsize = msgsize;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) gpadl_header = (struct vmbus_channel_gpadl_header *)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) msgheader->msg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) gpadl_header->rangecount = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) gpadl_header->range_buflen = sizeof(struct gpa_range) +
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) pagecount * sizeof(u64);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) gpadl_header->range[0].byte_offset = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) gpadl_header->range[0].byte_count = hv_gpadl_size(type, size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) for (i = 0; i < pagecount; i++)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) gpadl_header->range[0].pfn_array[i] = hv_gpadl_hvpfn(
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) type, kbuffer, size, send_offset, i);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) *msginfo = msgheader;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) nomem:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) kfree(msgheader);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376) kfree(msgbody);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381) * __vmbus_establish_gpadl - Establish a GPADL for a buffer or ringbuffer
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383) * @channel: a channel
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384) * @type: the type of the corresponding GPADL, only meaningful for the guest.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385) * @kbuffer: from kmalloc or vmalloc
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386) * @size: page-size multiple
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387) * @send_offset: the offset (in bytes) where the send ring buffer starts,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388) * should be 0 for BUFFER type gpadl
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389) * @gpadl_handle: some funky thing
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391) static int __vmbus_establish_gpadl(struct vmbus_channel *channel,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392) enum hv_gpadl_type type, void *kbuffer,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393) u32 size, u32 send_offset,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394) u32 *gpadl_handle)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 396) struct vmbus_channel_gpadl_header *gpadlmsg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 397) struct vmbus_channel_gpadl_body *gpadl_body;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 398) struct vmbus_channel_msginfo *msginfo = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 399) struct vmbus_channel_msginfo *submsginfo, *tmp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 400) struct list_head *curr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 401) u32 next_gpadl_handle;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 402) unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 403) int ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 404)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 405) next_gpadl_handle =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 406) (atomic_inc_return(&vmbus_connection.next_gpadl_handle) - 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 407)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 408) ret = create_gpadl_header(type, kbuffer, size, send_offset, &msginfo);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 409) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 410) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 411)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 412) init_completion(&msginfo->waitevent);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 413) msginfo->waiting_channel = channel;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 414)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 415) gpadlmsg = (struct vmbus_channel_gpadl_header *)msginfo->msg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 416) gpadlmsg->header.msgtype = CHANNELMSG_GPADL_HEADER;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 417) gpadlmsg->child_relid = channel->offermsg.child_relid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 418) gpadlmsg->gpadl = next_gpadl_handle;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 419)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 420)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 421) spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 422) list_add_tail(&msginfo->msglistentry,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 423) &vmbus_connection.chn_msg_list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 424)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 425) spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 426)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 427) if (channel->rescind) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 428) ret = -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 429) goto cleanup;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 430) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 431)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 432) ret = vmbus_post_msg(gpadlmsg, msginfo->msgsize -
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 433) sizeof(*msginfo), true);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 434)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 435) trace_vmbus_establish_gpadl_header(gpadlmsg, ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 436)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 437) if (ret != 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 438) goto cleanup;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 439)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 440) list_for_each(curr, &msginfo->submsglist) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 441) submsginfo = (struct vmbus_channel_msginfo *)curr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 442) gpadl_body =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 443) (struct vmbus_channel_gpadl_body *)submsginfo->msg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 444)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 445) gpadl_body->header.msgtype =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 446) CHANNELMSG_GPADL_BODY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 447) gpadl_body->gpadl = next_gpadl_handle;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 448)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 449) ret = vmbus_post_msg(gpadl_body,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 450) submsginfo->msgsize - sizeof(*submsginfo),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 451) true);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 452)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 453) trace_vmbus_establish_gpadl_body(gpadl_body, ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 454)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 455) if (ret != 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 456) goto cleanup;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 457)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 458) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 459) wait_for_completion(&msginfo->waitevent);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 460)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 461) if (msginfo->response.gpadl_created.creation_status != 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 462) pr_err("Failed to establish GPADL: err = 0x%x\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 463) msginfo->response.gpadl_created.creation_status);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 464)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 465) ret = -EDQUOT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 466) goto cleanup;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 467) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 468)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 469) if (channel->rescind) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 470) ret = -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 471) goto cleanup;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 472) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 473)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 474) /* At this point, we received the gpadl created msg */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 475) *gpadl_handle = gpadlmsg->gpadl;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 476)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 477) cleanup:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 478) spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 479) list_del(&msginfo->msglistentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 480) spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 481) list_for_each_entry_safe(submsginfo, tmp, &msginfo->submsglist,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 482) msglistentry) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 483) kfree(submsginfo);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 484) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 485)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 486) kfree(msginfo);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 487) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 488) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 489)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 490) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 491) * vmbus_establish_gpadl - Establish a GPADL for the specified buffer
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 492) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 493) * @channel: a channel
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 494) * @kbuffer: from kmalloc or vmalloc
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 495) * @size: page-size multiple
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 496) * @gpadl_handle: some funky thing
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 497) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 498) int vmbus_establish_gpadl(struct vmbus_channel *channel, void *kbuffer,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 499) u32 size, u32 *gpadl_handle)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 500) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 501) return __vmbus_establish_gpadl(channel, HV_GPADL_BUFFER, kbuffer, size,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 502) 0U, gpadl_handle);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 503) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 504) EXPORT_SYMBOL_GPL(vmbus_establish_gpadl);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 505)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 506) static int __vmbus_open(struct vmbus_channel *newchannel,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 507) void *userdata, u32 userdatalen,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 508) void (*onchannelcallback)(void *context), void *context)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 509) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 510) struct vmbus_channel_open_channel *open_msg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 511) struct vmbus_channel_msginfo *open_info = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 512) struct page *page = newchannel->ringbuffer_page;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 513) u32 send_pages, recv_pages;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 514) unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 515) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 516)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 517) if (userdatalen > MAX_USER_DEFINED_BYTES)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 518) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 519)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 520) send_pages = newchannel->ringbuffer_send_offset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 521) recv_pages = newchannel->ringbuffer_pagecount - send_pages;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 522)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 523) if (newchannel->state != CHANNEL_OPEN_STATE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 524) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 525)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 526) newchannel->state = CHANNEL_OPENING_STATE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 527) newchannel->onchannel_callback = onchannelcallback;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 528) newchannel->channel_callback_context = context;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 529)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 530) err = hv_ringbuffer_init(&newchannel->outbound, page, send_pages);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 531) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 532) goto error_clean_ring;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 533)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 534) err = hv_ringbuffer_init(&newchannel->inbound,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 535) &page[send_pages], recv_pages);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 536) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 537) goto error_clean_ring;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 538)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 539) /* Establish the gpadl for the ring buffer */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 540) newchannel->ringbuffer_gpadlhandle = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 541)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 542) err = __vmbus_establish_gpadl(newchannel, HV_GPADL_RING,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 543) page_address(newchannel->ringbuffer_page),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 544) (send_pages + recv_pages) << PAGE_SHIFT,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 545) newchannel->ringbuffer_send_offset << PAGE_SHIFT,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 546) &newchannel->ringbuffer_gpadlhandle);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 547) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 548) goto error_clean_ring;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 549)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 550) /* Create and init the channel open message */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 551) open_info = kmalloc(sizeof(*open_info) +
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 552) sizeof(struct vmbus_channel_open_channel),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 553) GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 554) if (!open_info) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 555) err = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 556) goto error_free_gpadl;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 557) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 558)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 559) init_completion(&open_info->waitevent);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 560) open_info->waiting_channel = newchannel;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 561)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 562) open_msg = (struct vmbus_channel_open_channel *)open_info->msg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 563) open_msg->header.msgtype = CHANNELMSG_OPENCHANNEL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 564) open_msg->openid = newchannel->offermsg.child_relid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 565) open_msg->child_relid = newchannel->offermsg.child_relid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 566) open_msg->ringbuffer_gpadlhandle = newchannel->ringbuffer_gpadlhandle;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 567) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 568) * The unit of ->downstream_ringbuffer_pageoffset is HV_HYP_PAGE and
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 569) * the unit of ->ringbuffer_send_offset (i.e. send_pages) is PAGE, so
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 570) * here we calculate it into HV_HYP_PAGE.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 571) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 572) open_msg->downstream_ringbuffer_pageoffset =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 573) hv_ring_gpadl_send_hvpgoffset(send_pages << PAGE_SHIFT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 574) open_msg->target_vp = hv_cpu_number_to_vp_number(newchannel->target_cpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 575)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 576) if (userdatalen)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 577) memcpy(open_msg->userdata, userdata, userdatalen);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 578)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 579) spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 580) list_add_tail(&open_info->msglistentry,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 581) &vmbus_connection.chn_msg_list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 582) spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 583)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 584) if (newchannel->rescind) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 585) err = -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 586) goto error_clean_msglist;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 587) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 588)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 589) err = vmbus_post_msg(open_msg,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 590) sizeof(struct vmbus_channel_open_channel), true);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 591)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 592) trace_vmbus_open(open_msg, err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 593)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 594) if (err != 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 595) goto error_clean_msglist;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 596)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 597) wait_for_completion(&open_info->waitevent);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 598)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 599) spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 600) list_del(&open_info->msglistentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 601) spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 602)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 603) if (newchannel->rescind) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 604) err = -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 605) goto error_free_info;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 606) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 607)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 608) if (open_info->response.open_result.status) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 609) err = -EAGAIN;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 610) goto error_free_info;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 611) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 612)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 613) newchannel->state = CHANNEL_OPENED_STATE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 614) kfree(open_info);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 615) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 616)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 617) error_clean_msglist:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 618) spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 619) list_del(&open_info->msglistentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 620) spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 621) error_free_info:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 622) kfree(open_info);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 623) error_free_gpadl:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 624) vmbus_teardown_gpadl(newchannel, newchannel->ringbuffer_gpadlhandle);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 625) newchannel->ringbuffer_gpadlhandle = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 626) error_clean_ring:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 627) hv_ringbuffer_cleanup(&newchannel->outbound);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 628) hv_ringbuffer_cleanup(&newchannel->inbound);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 629) newchannel->state = CHANNEL_OPEN_STATE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 630) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 631) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 632)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 633) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 634) * vmbus_connect_ring - Open the channel but reuse ring buffer
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 635) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 636) int vmbus_connect_ring(struct vmbus_channel *newchannel,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 637) void (*onchannelcallback)(void *context), void *context)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 638) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 639) return __vmbus_open(newchannel, NULL, 0, onchannelcallback, context);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 640) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 641) EXPORT_SYMBOL_GPL(vmbus_connect_ring);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 642)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 643) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 644) * vmbus_open - Open the specified channel.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 645) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 646) int vmbus_open(struct vmbus_channel *newchannel,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 647) u32 send_ringbuffer_size, u32 recv_ringbuffer_size,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 648) void *userdata, u32 userdatalen,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 649) void (*onchannelcallback)(void *context), void *context)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 650) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 651) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 652)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 653) err = vmbus_alloc_ring(newchannel, send_ringbuffer_size,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 654) recv_ringbuffer_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 655) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 656) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 657)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 658) err = __vmbus_open(newchannel, userdata, userdatalen,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 659) onchannelcallback, context);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 660) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 661) vmbus_free_ring(newchannel);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 662)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 663) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 664) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 665) EXPORT_SYMBOL_GPL(vmbus_open);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 666)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 667) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 668) * vmbus_teardown_gpadl -Teardown the specified GPADL handle
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 669) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 670) int vmbus_teardown_gpadl(struct vmbus_channel *channel, u32 gpadl_handle)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 671) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 672) struct vmbus_channel_gpadl_teardown *msg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 673) struct vmbus_channel_msginfo *info;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 674) unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 675) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 676)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 677) info = kmalloc(sizeof(*info) +
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 678) sizeof(struct vmbus_channel_gpadl_teardown), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 679) if (!info)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 680) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 681)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 682) init_completion(&info->waitevent);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 683) info->waiting_channel = channel;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 684)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 685) msg = (struct vmbus_channel_gpadl_teardown *)info->msg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 686)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 687) msg->header.msgtype = CHANNELMSG_GPADL_TEARDOWN;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 688) msg->child_relid = channel->offermsg.child_relid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 689) msg->gpadl = gpadl_handle;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 690)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 691) spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 692) list_add_tail(&info->msglistentry,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 693) &vmbus_connection.chn_msg_list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 694) spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 695)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 696) if (channel->rescind)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 697) goto post_msg_err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 698)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 699) ret = vmbus_post_msg(msg, sizeof(struct vmbus_channel_gpadl_teardown),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 700) true);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 701)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 702) trace_vmbus_teardown_gpadl(msg, ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 703)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 704) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 705) goto post_msg_err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 706)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 707) wait_for_completion(&info->waitevent);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 708)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 709) post_msg_err:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 710) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 711) * If the channel has been rescinded;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 712) * we will be awakened by the rescind
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 713) * handler; set the error code to zero so we don't leak memory.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 714) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 715) if (channel->rescind)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 716) ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 717)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 718) spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 719) list_del(&info->msglistentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 720) spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 721)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 722) kfree(info);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 723) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 724) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 725) EXPORT_SYMBOL_GPL(vmbus_teardown_gpadl);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 726)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 727) void vmbus_reset_channel_cb(struct vmbus_channel *channel)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 728) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 729) unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 730)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 731) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 732) * vmbus_on_event(), running in the per-channel tasklet, can race
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 733) * with vmbus_close_internal() in the case of SMP guest, e.g., when
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 734) * the former is accessing channel->inbound.ring_buffer, the latter
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 735) * could be freeing the ring_buffer pages, so here we must stop it
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 736) * first.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 737) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 738) * vmbus_chan_sched() might call the netvsc driver callback function
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 739) * that ends up scheduling NAPI work that accesses the ring buffer.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 740) * At this point, we have to ensure that any such work is completed
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 741) * and that the channel ring buffer is no longer being accessed, cf.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 742) * the calls to napi_disable() in netvsc_device_remove().
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 743) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 744) tasklet_disable(&channel->callback_event);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 745)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 746) /* See the inline comments in vmbus_chan_sched(). */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 747) spin_lock_irqsave(&channel->sched_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 748) channel->onchannel_callback = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 749) spin_unlock_irqrestore(&channel->sched_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 750)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 751) channel->sc_creation_callback = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 752)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 753) /* Re-enable tasklet for use on re-open */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 754) tasklet_enable(&channel->callback_event);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 755) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 756)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 757) static int vmbus_close_internal(struct vmbus_channel *channel)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 758) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 759) struct vmbus_channel_close_channel *msg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 760) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 761)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 762) vmbus_reset_channel_cb(channel);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 763)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 764) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 765) * In case a device driver's probe() fails (e.g.,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 766) * util_probe() -> vmbus_open() returns -ENOMEM) and the device is
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 767) * rescinded later (e.g., we dynamically disable an Integrated Service
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 768) * in Hyper-V Manager), the driver's remove() invokes vmbus_close():
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 769) * here we should skip most of the below cleanup work.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 770) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 771) if (channel->state != CHANNEL_OPENED_STATE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 772) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 773)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 774) channel->state = CHANNEL_OPEN_STATE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 775)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 776) /* Send a closing message */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 777)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 778) msg = &channel->close_msg.msg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 779)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 780) msg->header.msgtype = CHANNELMSG_CLOSECHANNEL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 781) msg->child_relid = channel->offermsg.child_relid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 782)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 783) ret = vmbus_post_msg(msg, sizeof(struct vmbus_channel_close_channel),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 784) true);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 785)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 786) trace_vmbus_close_internal(msg, ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 787)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 788) if (ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 789) pr_err("Close failed: close post msg return is %d\n", ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 790) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 791) * If we failed to post the close msg,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 792) * it is perhaps better to leak memory.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 793) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 794) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 795)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 796) /* Tear down the gpadl for the channel's ring buffer */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 797) else if (channel->ringbuffer_gpadlhandle) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 798) ret = vmbus_teardown_gpadl(channel,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 799) channel->ringbuffer_gpadlhandle);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 800) if (ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 801) pr_err("Close failed: teardown gpadl return %d\n", ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 802) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 803) * If we failed to teardown gpadl,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 804) * it is perhaps better to leak memory.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 805) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 806) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 807)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 808) channel->ringbuffer_gpadlhandle = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 809) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 810)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 811) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 812) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 813)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 814) /* disconnect ring - close all channels */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 815) int vmbus_disconnect_ring(struct vmbus_channel *channel)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 816) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 817) struct vmbus_channel *cur_channel, *tmp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 818) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 819)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 820) if (channel->primary_channel != NULL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 821) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 822)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 823) list_for_each_entry_safe(cur_channel, tmp, &channel->sc_list, sc_list) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 824) if (cur_channel->rescind)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 825) wait_for_completion(&cur_channel->rescind_event);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 826)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 827) mutex_lock(&vmbus_connection.channel_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 828) if (vmbus_close_internal(cur_channel) == 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 829) vmbus_free_ring(cur_channel);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 830)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 831) if (cur_channel->rescind)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 832) hv_process_channel_removal(cur_channel);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 833) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 834) mutex_unlock(&vmbus_connection.channel_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 835) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 836)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 837) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 838) * Now close the primary.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 839) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 840) mutex_lock(&vmbus_connection.channel_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 841) ret = vmbus_close_internal(channel);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 842) mutex_unlock(&vmbus_connection.channel_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 843)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 844) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 845) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 846) EXPORT_SYMBOL_GPL(vmbus_disconnect_ring);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 847)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 848) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 849) * vmbus_close - Close the specified channel
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 850) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 851) void vmbus_close(struct vmbus_channel *channel)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 852) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 853) if (vmbus_disconnect_ring(channel) == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 854) vmbus_free_ring(channel);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 855) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 856) EXPORT_SYMBOL_GPL(vmbus_close);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 857)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 858) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 859) * vmbus_sendpacket() - Send the specified buffer on the given channel
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 860) * @channel: Pointer to vmbus_channel structure
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 861) * @buffer: Pointer to the buffer you want to send the data from.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 862) * @bufferlen: Maximum size of what the buffer holds.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 863) * @requestid: Identifier of the request
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 864) * @type: Type of packet that is being sent e.g. negotiate, time
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 865) * packet etc.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 866) * @flags: 0 or VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 867) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 868) * Sends data in @buffer directly to Hyper-V via the vmbus.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 869) * This will send the data unparsed to Hyper-V.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 870) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 871) * Mainly used by Hyper-V drivers.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 872) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 873) int vmbus_sendpacket(struct vmbus_channel *channel, void *buffer,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 874) u32 bufferlen, u64 requestid,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 875) enum vmbus_packet_type type, u32 flags)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 876) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 877) struct vmpacket_descriptor desc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 878) u32 packetlen = sizeof(struct vmpacket_descriptor) + bufferlen;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 879) u32 packetlen_aligned = ALIGN(packetlen, sizeof(u64));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 880) struct kvec bufferlist[3];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 881) u64 aligned_data = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 882) int num_vecs = ((bufferlen != 0) ? 3 : 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 883)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 884)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 885) /* Setup the descriptor */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 886) desc.type = type; /* VmbusPacketTypeDataInBand; */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 887) desc.flags = flags; /* VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED; */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 888) /* in 8-bytes granularity */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 889) desc.offset8 = sizeof(struct vmpacket_descriptor) >> 3;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 890) desc.len8 = (u16)(packetlen_aligned >> 3);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 891) desc.trans_id = requestid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 892)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 893) bufferlist[0].iov_base = &desc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 894) bufferlist[0].iov_len = sizeof(struct vmpacket_descriptor);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 895) bufferlist[1].iov_base = buffer;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 896) bufferlist[1].iov_len = bufferlen;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 897) bufferlist[2].iov_base = &aligned_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 898) bufferlist[2].iov_len = (packetlen_aligned - packetlen);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 899)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 900) return hv_ringbuffer_write(channel, bufferlist, num_vecs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 901) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 902) EXPORT_SYMBOL(vmbus_sendpacket);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 903)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 904) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 905) * vmbus_sendpacket_pagebuffer - Send a range of single-page buffer
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 906) * packets using a GPADL Direct packet type. This interface allows you
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 907) * to control notifying the host. This will be useful for sending
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 908) * batched data. Also the sender can control the send flags
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 909) * explicitly.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 910) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 911) int vmbus_sendpacket_pagebuffer(struct vmbus_channel *channel,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 912) struct hv_page_buffer pagebuffers[],
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 913) u32 pagecount, void *buffer, u32 bufferlen,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 914) u64 requestid)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 915) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 916) int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 917) struct vmbus_channel_packet_page_buffer desc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 918) u32 descsize;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 919) u32 packetlen;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 920) u32 packetlen_aligned;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 921) struct kvec bufferlist[3];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 922) u64 aligned_data = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 923)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 924) if (pagecount > MAX_PAGE_BUFFER_COUNT)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 925) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 926)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 927) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 928) * Adjust the size down since vmbus_channel_packet_page_buffer is the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 929) * largest size we support
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 930) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 931) descsize = sizeof(struct vmbus_channel_packet_page_buffer) -
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 932) ((MAX_PAGE_BUFFER_COUNT - pagecount) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 933) sizeof(struct hv_page_buffer));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 934) packetlen = descsize + bufferlen;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 935) packetlen_aligned = ALIGN(packetlen, sizeof(u64));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 936)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 937) /* Setup the descriptor */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 938) desc.type = VM_PKT_DATA_USING_GPA_DIRECT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 939) desc.flags = VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 940) desc.dataoffset8 = descsize >> 3; /* in 8-bytes granularity */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 941) desc.length8 = (u16)(packetlen_aligned >> 3);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 942) desc.transactionid = requestid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 943) desc.reserved = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 944) desc.rangecount = pagecount;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 945)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 946) for (i = 0; i < pagecount; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 947) desc.range[i].len = pagebuffers[i].len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 948) desc.range[i].offset = pagebuffers[i].offset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 949) desc.range[i].pfn = pagebuffers[i].pfn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 950) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 951)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 952) bufferlist[0].iov_base = &desc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 953) bufferlist[0].iov_len = descsize;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 954) bufferlist[1].iov_base = buffer;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 955) bufferlist[1].iov_len = bufferlen;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 956) bufferlist[2].iov_base = &aligned_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 957) bufferlist[2].iov_len = (packetlen_aligned - packetlen);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 958)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 959) return hv_ringbuffer_write(channel, bufferlist, 3);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 960) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 961) EXPORT_SYMBOL_GPL(vmbus_sendpacket_pagebuffer);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 962)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 963) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 964) * vmbus_sendpacket_multipagebuffer - Send a multi-page buffer packet
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 965) * using a GPADL Direct packet type.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 966) * The buffer includes the vmbus descriptor.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 967) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 968) int vmbus_sendpacket_mpb_desc(struct vmbus_channel *channel,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 969) struct vmbus_packet_mpb_array *desc,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 970) u32 desc_size,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 971) void *buffer, u32 bufferlen, u64 requestid)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 972) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 973) u32 packetlen;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 974) u32 packetlen_aligned;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 975) struct kvec bufferlist[3];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 976) u64 aligned_data = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 977)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 978) packetlen = desc_size + bufferlen;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 979) packetlen_aligned = ALIGN(packetlen, sizeof(u64));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 980)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 981) /* Setup the descriptor */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 982) desc->type = VM_PKT_DATA_USING_GPA_DIRECT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 983) desc->flags = VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 984) desc->dataoffset8 = desc_size >> 3; /* in 8-bytes granularity */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 985) desc->length8 = (u16)(packetlen_aligned >> 3);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 986) desc->transactionid = requestid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 987) desc->reserved = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 988) desc->rangecount = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 989)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 990) bufferlist[0].iov_base = desc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 991) bufferlist[0].iov_len = desc_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 992) bufferlist[1].iov_base = buffer;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 993) bufferlist[1].iov_len = bufferlen;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 994) bufferlist[2].iov_base = &aligned_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 995) bufferlist[2].iov_len = (packetlen_aligned - packetlen);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 996)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 997) return hv_ringbuffer_write(channel, bufferlist, 3);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 998) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 999) EXPORT_SYMBOL_GPL(vmbus_sendpacket_mpb_desc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1000)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1001) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1002) * __vmbus_recvpacket() - Retrieve the user packet on the specified channel
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1003) * @channel: Pointer to vmbus_channel structure
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1004) * @buffer: Pointer to the buffer you want to receive the data into.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1005) * @bufferlen: Maximum size of what the buffer can hold.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1006) * @buffer_actual_len: The actual size of the data after it was received.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1007) * @requestid: Identifier of the request
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1008) * @raw: true means keep the vmpacket_descriptor header in the received data.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1009) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1010) * Receives directly from the hyper-v vmbus and puts the data it received
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1011) * into Buffer. This will receive the data unparsed from hyper-v.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1012) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1013) * Mainly used by Hyper-V drivers.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1014) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1015) static inline int
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1016) __vmbus_recvpacket(struct vmbus_channel *channel, void *buffer,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1017) u32 bufferlen, u32 *buffer_actual_len, u64 *requestid,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1018) bool raw)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1019) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1020) return hv_ringbuffer_read(channel, buffer, bufferlen,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1021) buffer_actual_len, requestid, raw);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1022)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1023) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1024)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1025) int vmbus_recvpacket(struct vmbus_channel *channel, void *buffer,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1026) u32 bufferlen, u32 *buffer_actual_len,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1027) u64 *requestid)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1028) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1029) return __vmbus_recvpacket(channel, buffer, bufferlen,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1030) buffer_actual_len, requestid, false);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1031) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1032) EXPORT_SYMBOL(vmbus_recvpacket);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1033)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1034) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1035) * vmbus_recvpacket_raw - Retrieve the raw packet on the specified channel
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1036) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1037) int vmbus_recvpacket_raw(struct vmbus_channel *channel, void *buffer,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1038) u32 bufferlen, u32 *buffer_actual_len,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1039) u64 *requestid)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1040) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1041) return __vmbus_recvpacket(channel, buffer, bufferlen,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1042) buffer_actual_len, requestid, true);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1043) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1044) EXPORT_SYMBOL_GPL(vmbus_recvpacket_raw);
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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