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linux-next/drivers/pci/vc.c
Yijing Wang 777e61ea40 PCI: Use dev->has_secondary_link to find downstream PCIe links
Previously we assumed that PCIe Root Ports and Downstream Ports had Links
on their secondary side.  That is true in most systems, but it is possible
to connect a switch with either an Upstream or a Downstream Port leading
downstream.

Instead of relying on the component type to identify devices that have
links leading downstream, use the "dev->has_secondary_link" field.

[bhelgaas: changelog]
Signed-off-by: Yijing Wang <wangyijing@huawei.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
2015-05-29 15:35:26 -05:00

434 lines
12 KiB
C

/*
* PCI Virtual Channel support
*
* Copyright (C) 2013 Red Hat, Inc. All rights reserved.
* Author: Alex Williamson <alex.williamson@redhat.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/device.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/pci_regs.h>
#include <linux/types.h>
/**
* pci_vc_save_restore_dwords - Save or restore a series of dwords
* @dev: device
* @pos: starting config space position
* @buf: buffer to save to or restore from
* @dwords: number of dwords to save/restore
* @save: whether to save or restore
*/
static void pci_vc_save_restore_dwords(struct pci_dev *dev, int pos,
u32 *buf, int dwords, bool save)
{
int i;
for (i = 0; i < dwords; i++, buf++) {
if (save)
pci_read_config_dword(dev, pos + (i * 4), buf);
else
pci_write_config_dword(dev, pos + (i * 4), *buf);
}
}
/**
* pci_vc_load_arb_table - load and wait for VC arbitration table
* @dev: device
* @pos: starting position of VC capability (VC/VC9/MFVC)
*
* Set Load VC Arbitration Table bit requesting hardware to apply the VC
* Arbitration Table (previously loaded). When the VC Arbitration Table
* Status clears, hardware has latched the table into VC arbitration logic.
*/
static void pci_vc_load_arb_table(struct pci_dev *dev, int pos)
{
u16 ctrl;
pci_read_config_word(dev, pos + PCI_VC_PORT_CTRL, &ctrl);
pci_write_config_word(dev, pos + PCI_VC_PORT_CTRL,
ctrl | PCI_VC_PORT_CTRL_LOAD_TABLE);
if (pci_wait_for_pending(dev, pos + PCI_VC_PORT_STATUS,
PCI_VC_PORT_STATUS_TABLE))
return;
dev_err(&dev->dev, "VC arbitration table failed to load\n");
}
/**
* pci_vc_load_port_arb_table - Load and wait for VC port arbitration table
* @dev: device
* @pos: starting position of VC capability (VC/VC9/MFVC)
* @res: VC resource number, ie. VCn (0-7)
*
* Set Load Port Arbitration Table bit requesting hardware to apply the Port
* Arbitration Table (previously loaded). When the Port Arbitration Table
* Status clears, hardware has latched the table into port arbitration logic.
*/
static void pci_vc_load_port_arb_table(struct pci_dev *dev, int pos, int res)
{
int ctrl_pos, status_pos;
u32 ctrl;
ctrl_pos = pos + PCI_VC_RES_CTRL + (res * PCI_CAP_VC_PER_VC_SIZEOF);
status_pos = pos + PCI_VC_RES_STATUS + (res * PCI_CAP_VC_PER_VC_SIZEOF);
pci_read_config_dword(dev, ctrl_pos, &ctrl);
pci_write_config_dword(dev, ctrl_pos,
ctrl | PCI_VC_RES_CTRL_LOAD_TABLE);
if (pci_wait_for_pending(dev, status_pos, PCI_VC_RES_STATUS_TABLE))
return;
dev_err(&dev->dev, "VC%d port arbitration table failed to load\n", res);
}
/**
* pci_vc_enable - Enable virtual channel
* @dev: device
* @pos: starting position of VC capability (VC/VC9/MFVC)
* @res: VC res number, ie. VCn (0-7)
*
* A VC is enabled by setting the enable bit in matching resource control
* registers on both sides of a link. We therefore need to find the opposite
* end of the link. To keep this simple we enable from the downstream device.
* RC devices do not have an upstream device, nor does it seem that VC9 do
* (spec is unclear). Once we find the upstream device, match the VC ID to
* get the correct resource, disable and enable on both ends.
*/
static void pci_vc_enable(struct pci_dev *dev, int pos, int res)
{
int ctrl_pos, status_pos, id, pos2, evcc, i, ctrl_pos2, status_pos2;
u32 ctrl, header, cap1, ctrl2;
struct pci_dev *link = NULL;
/* Enable VCs from the downstream device */
if (!dev->has_secondary_link)
return;
ctrl_pos = pos + PCI_VC_RES_CTRL + (res * PCI_CAP_VC_PER_VC_SIZEOF);
status_pos = pos + PCI_VC_RES_STATUS + (res * PCI_CAP_VC_PER_VC_SIZEOF);
pci_read_config_dword(dev, ctrl_pos, &ctrl);
id = ctrl & PCI_VC_RES_CTRL_ID;
pci_read_config_dword(dev, pos, &header);
/* If there is no opposite end of the link, skip to enable */
if (PCI_EXT_CAP_ID(header) == PCI_EXT_CAP_ID_VC9 ||
pci_is_root_bus(dev->bus))
goto enable;
pos2 = pci_find_ext_capability(dev->bus->self, PCI_EXT_CAP_ID_VC);
if (!pos2)
goto enable;
pci_read_config_dword(dev->bus->self, pos2 + PCI_VC_PORT_CAP1, &cap1);
evcc = cap1 & PCI_VC_CAP1_EVCC;
/* VC0 is hardwired enabled, so we can start with 1 */
for (i = 1; i < evcc + 1; i++) {
ctrl_pos2 = pos2 + PCI_VC_RES_CTRL +
(i * PCI_CAP_VC_PER_VC_SIZEOF);
status_pos2 = pos2 + PCI_VC_RES_STATUS +
(i * PCI_CAP_VC_PER_VC_SIZEOF);
pci_read_config_dword(dev->bus->self, ctrl_pos2, &ctrl2);
if ((ctrl2 & PCI_VC_RES_CTRL_ID) == id) {
link = dev->bus->self;
break;
}
}
if (!link)
goto enable;
/* Disable if enabled */
if (ctrl2 & PCI_VC_RES_CTRL_ENABLE) {
ctrl2 &= ~PCI_VC_RES_CTRL_ENABLE;
pci_write_config_dword(link, ctrl_pos2, ctrl2);
}
/* Enable on both ends */
ctrl2 |= PCI_VC_RES_CTRL_ENABLE;
pci_write_config_dword(link, ctrl_pos2, ctrl2);
enable:
ctrl |= PCI_VC_RES_CTRL_ENABLE;
pci_write_config_dword(dev, ctrl_pos, ctrl);
if (!pci_wait_for_pending(dev, status_pos, PCI_VC_RES_STATUS_NEGO))
dev_err(&dev->dev, "VC%d negotiation stuck pending\n", id);
if (link && !pci_wait_for_pending(link, status_pos2,
PCI_VC_RES_STATUS_NEGO))
dev_err(&link->dev, "VC%d negotiation stuck pending\n", id);
}
/**
* pci_vc_do_save_buffer - Size, save, or restore VC state
* @dev: device
* @pos: starting position of VC capability (VC/VC9/MFVC)
* @save_state: buffer for save/restore
* @name: for error message
* @save: if provided a buffer, this indicates what to do with it
*
* Walking Virtual Channel config space to size, save, or restore it
* is complicated, so we do it all from one function to reduce code and
* guarantee ordering matches in the buffer. When called with NULL
* @save_state, return the size of the necessary save buffer. When called
* with a non-NULL @save_state, @save determines whether we save to the
* buffer or restore from it.
*/
static int pci_vc_do_save_buffer(struct pci_dev *dev, int pos,
struct pci_cap_saved_state *save_state,
bool save)
{
u32 cap1;
char evcc, lpevcc, parb_size;
int i, len = 0;
u8 *buf = save_state ? (u8 *)save_state->cap.data : NULL;
/* Sanity check buffer size for save/restore */
if (buf && save_state->cap.size !=
pci_vc_do_save_buffer(dev, pos, NULL, save)) {
dev_err(&dev->dev,
"VC save buffer size does not match @0x%x\n", pos);
return -ENOMEM;
}
pci_read_config_dword(dev, pos + PCI_VC_PORT_CAP1, &cap1);
/* Extended VC Count (not counting VC0) */
evcc = cap1 & PCI_VC_CAP1_EVCC;
/* Low Priority Extended VC Count (not counting VC0) */
lpevcc = (cap1 & PCI_VC_CAP1_LPEVCC) >> 4;
/* Port Arbitration Table Entry Size (bits) */
parb_size = 1 << ((cap1 & PCI_VC_CAP1_ARB_SIZE) >> 10);
/*
* Port VC Control Register contains VC Arbitration Select, which
* cannot be modified when more than one LPVC is in operation. We
* therefore save/restore it first, as only VC0 should be enabled
* after device reset.
*/
if (buf) {
if (save)
pci_read_config_word(dev, pos + PCI_VC_PORT_CTRL,
(u16 *)buf);
else
pci_write_config_word(dev, pos + PCI_VC_PORT_CTRL,
*(u16 *)buf);
buf += 2;
}
len += 2;
/*
* If we have any Low Priority VCs and a VC Arbitration Table Offset
* in Port VC Capability Register 2 then save/restore it next.
*/
if (lpevcc) {
u32 cap2;
int vcarb_offset;
pci_read_config_dword(dev, pos + PCI_VC_PORT_CAP2, &cap2);
vcarb_offset = ((cap2 & PCI_VC_CAP2_ARB_OFF) >> 24) * 16;
if (vcarb_offset) {
int size, vcarb_phases = 0;
if (cap2 & PCI_VC_CAP2_128_PHASE)
vcarb_phases = 128;
else if (cap2 & PCI_VC_CAP2_64_PHASE)
vcarb_phases = 64;
else if (cap2 & PCI_VC_CAP2_32_PHASE)
vcarb_phases = 32;
/* Fixed 4 bits per phase per lpevcc (plus VC0) */
size = ((lpevcc + 1) * vcarb_phases * 4) / 8;
if (size && buf) {
pci_vc_save_restore_dwords(dev,
pos + vcarb_offset,
(u32 *)buf,
size / 4, save);
/*
* On restore, we need to signal hardware to
* re-load the VC Arbitration Table.
*/
if (!save)
pci_vc_load_arb_table(dev, pos);
buf += size;
}
len += size;
}
}
/*
* In addition to each VC Resource Control Register, we may have a
* Port Arbitration Table attached to each VC. The Port Arbitration
* Table Offset in each VC Resource Capability Register tells us if
* it exists. The entry size is global from the Port VC Capability
* Register1 above. The number of phases is determined per VC.
*/
for (i = 0; i < evcc + 1; i++) {
u32 cap;
int parb_offset;
pci_read_config_dword(dev, pos + PCI_VC_RES_CAP +
(i * PCI_CAP_VC_PER_VC_SIZEOF), &cap);
parb_offset = ((cap & PCI_VC_RES_CAP_ARB_OFF) >> 24) * 16;
if (parb_offset) {
int size, parb_phases = 0;
if (cap & PCI_VC_RES_CAP_256_PHASE)
parb_phases = 256;
else if (cap & (PCI_VC_RES_CAP_128_PHASE |
PCI_VC_RES_CAP_128_PHASE_TB))
parb_phases = 128;
else if (cap & PCI_VC_RES_CAP_64_PHASE)
parb_phases = 64;
else if (cap & PCI_VC_RES_CAP_32_PHASE)
parb_phases = 32;
size = (parb_size * parb_phases) / 8;
if (size && buf) {
pci_vc_save_restore_dwords(dev,
pos + parb_offset,
(u32 *)buf,
size / 4, save);
buf += size;
}
len += size;
}
/* VC Resource Control Register */
if (buf) {
int ctrl_pos = pos + PCI_VC_RES_CTRL +
(i * PCI_CAP_VC_PER_VC_SIZEOF);
if (save)
pci_read_config_dword(dev, ctrl_pos,
(u32 *)buf);
else {
u32 tmp, ctrl = *(u32 *)buf;
/*
* For an FLR case, the VC config may remain.
* Preserve enable bit, restore the rest.
*/
pci_read_config_dword(dev, ctrl_pos, &tmp);
tmp &= PCI_VC_RES_CTRL_ENABLE;
tmp |= ctrl & ~PCI_VC_RES_CTRL_ENABLE;
pci_write_config_dword(dev, ctrl_pos, tmp);
/* Load port arbitration table if used */
if (ctrl & PCI_VC_RES_CTRL_ARB_SELECT)
pci_vc_load_port_arb_table(dev, pos, i);
/* Re-enable if needed */
if ((ctrl ^ tmp) & PCI_VC_RES_CTRL_ENABLE)
pci_vc_enable(dev, pos, i);
}
buf += 4;
}
len += 4;
}
return buf ? 0 : len;
}
static struct {
u16 id;
const char *name;
} vc_caps[] = { { PCI_EXT_CAP_ID_MFVC, "MFVC" },
{ PCI_EXT_CAP_ID_VC, "VC" },
{ PCI_EXT_CAP_ID_VC9, "VC9" } };
/**
* pci_save_vc_state - Save VC state to pre-allocate save buffer
* @dev: device
*
* For each type of VC capability, VC/VC9/MFVC, find the capability and
* save it to the pre-allocated save buffer.
*/
int pci_save_vc_state(struct pci_dev *dev)
{
int i;
for (i = 0; i < ARRAY_SIZE(vc_caps); i++) {
int pos, ret;
struct pci_cap_saved_state *save_state;
pos = pci_find_ext_capability(dev, vc_caps[i].id);
if (!pos)
continue;
save_state = pci_find_saved_ext_cap(dev, vc_caps[i].id);
if (!save_state) {
dev_err(&dev->dev, "%s buffer not found in %s\n",
vc_caps[i].name, __func__);
return -ENOMEM;
}
ret = pci_vc_do_save_buffer(dev, pos, save_state, true);
if (ret) {
dev_err(&dev->dev, "%s save unsuccessful %s\n",
vc_caps[i].name, __func__);
return ret;
}
}
return 0;
}
/**
* pci_restore_vc_state - Restore VC state from save buffer
* @dev: device
*
* For each type of VC capability, VC/VC9/MFVC, find the capability and
* restore it from the previously saved buffer.
*/
void pci_restore_vc_state(struct pci_dev *dev)
{
int i;
for (i = 0; i < ARRAY_SIZE(vc_caps); i++) {
int pos;
struct pci_cap_saved_state *save_state;
pos = pci_find_ext_capability(dev, vc_caps[i].id);
save_state = pci_find_saved_ext_cap(dev, vc_caps[i].id);
if (!save_state || !pos)
continue;
pci_vc_do_save_buffer(dev, pos, save_state, false);
}
}
/**
* pci_allocate_vc_save_buffers - Allocate save buffers for VC caps
* @dev: device
*
* For each type of VC capability, VC/VC9/MFVC, find the capability, size
* it, and allocate a buffer for save/restore.
*/
void pci_allocate_vc_save_buffers(struct pci_dev *dev)
{
int i;
for (i = 0; i < ARRAY_SIZE(vc_caps); i++) {
int len, pos = pci_find_ext_capability(dev, vc_caps[i].id);
if (!pos)
continue;
len = pci_vc_do_save_buffer(dev, pos, NULL, false);
if (pci_add_ext_cap_save_buffer(dev, vc_caps[i].id, len))
dev_err(&dev->dev,
"unable to preallocate %s save buffer\n",
vc_caps[i].name);
}
}