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acrn-hypervisor/devicemodel/hw/pci/npk.c

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/*
* Copyright (C) 2018 Intel Corporation.
* SPDX-License-Identifier: BSD-3-Clause
*/
/*
* The Intel Trace Hub (aka. North Peak, NPK) is a trace aggregator for
* Software, Firmware, and Hardware. On the virtualization platform, it
* can be used to output the traces from SOS/UOS/Hypervisor/FW together
* with unified timestamps.
*
* There are 2 software visible MMIO space in the npk pci device. One is
* the CSR which maps the configuration registers, and the other is the
* STMR which is organized as many Masters, and used to send the traces.
* Each Master has a fixed number of Channels, which is 128 on GP. Each
* channel occupies 64B, so the offset of each Master is 8K (64B*128).
* Here is the detailed layout of STMR:
* M=NPK_SW_MSTR_STP (1024 on GP)
* +-------------------+
* | m[M],c[C-1] |
* Base(M,C-1) +-------------------+
* | ... |
* +-------------------+
* | m[M],c[0] |
* Base(M,0) +-------------------+
* | ... |
* +-------------------+
* | m[i+1],c[1] |
* Base(i+1,1) +-------------------+
* | m[i+1],c[0] |
* Base(i+1,0) +-------------------+
* | ... |
* +-------------------+
* | m[i],c[1] |
* Base(i,1)=SW_BAR+0x40 +-------------------+
* | m[i],c[0] | 64B
* Base(i,0)=SW_BAR +-------------------+
* i=NPK_SW_MSTR_STRT (256 on GP)
*
* CSR and STMR are treated differently in npk virtualization because:
* 1. CSR configuration should come from just one OS, instead of each OS.
* In our case, it should come from SOS.
* 2. For performance and timing concern, the traces from each OS should
* be written to STMR directly.
*
* Based on these, the npk virtualization is implemented in this way:
* 1. The physical CSR is owned by SOS, and dm/npk emulates a software
* one for the UOS, to keep the npk driver on UOS unchanged. Some CSR
* initial values are configured to make the UOS npk driver think it
* is working on a real npk. The CSR configuration from UOS is ignored
* by dm, and it will not bring any side-effect. Because traces are the
* only things needed from UOS, the location to send traces to and the
* trace format are not affected by the CSR configuration.
* 2. Part of the physical STMR will be reserved for the SOS, and the
* others will be passed through to the UOS, so that the UOS can write
* the traces to the MMIO space directly.
*
* A parameter is needed to indicate the offset and size of the Masters
* to pass through to the UOS. For example, "-s 0:2,npk,512/256", there
* are 256 Masters from #768 (256+512, #256 is the starting Master for
* software tracing) passed through to the UOS.
*
* CSR STMR
* SOS: +--------------+ +----------------------------------+
* | physical CSR | | Reserved for SOS | |
* +--------------+ +----------------------------------+
* UOS: +--------------+ +---------------+
* | sw CSR by dm | | mapped to UOS |
* +--------------+ +---------------+
*
* Here is an overall flow about how it works.
* 1. System boots up, and the npk driver on SOS is loaded.
* 2. The dm is launched with parameters to enable npk virtualization.
* 3. The dm/npk sets up a bar for CSR, and some values are initialized
* based on the parameters, for example, the total number of Masters for
* the UOS.
* 4. The dm/npk sets up a bar for STMR, and maps part of the physical
* STMR to it with an offset, according to the parameters.
* 5. The UOS boots up, and the native npk driver on the UOS is loaded.
* 6. Enable the traces from UOS, and the traces are written directly to
* STMR, but not output by npk for now.
* 7. Enable the npk output on SOS, and now the traces are output by npk
* to the selected target.
* 8. If the memory is the selected target, the traces can be retrieved
* from memory on SOS, after stopping the traces.
*/
#include <stdio.h>
#include <fcntl.h>
#include <unistd.h>
#include <dirent.h>
#include <string.h>
#include "dm.h"
#include "vmmapi.h"
#include "pci_core.h"
#include "npk.h"
static int pci_npk_debug;
#define DPRINTF(params) do { if (pci_npk_debug) printf params; } while (0)
#define WPRINTF(params) (printf params)
#define npk_gth_reg(x) (npk_csr[NPK_CSR_GTH].data.u8[(x)])
#define npk_sth_reg(x) (npk_csr[NPK_CSR_STH].data.u8[(x)])
#define npk_msc0_reg(x) (npk_csr[NPK_CSR_MSC0].data.u8[(x)])
#define npk_msc1_reg(x) (npk_csr[NPK_CSR_MSC1].data.u8[(x)])
#define npk_pti_reg(x) (npk_csr[NPK_CSR_PTI].data.u8[(x)])
#define npk_gth_reg32(x) (npk_csr[NPK_CSR_GTH].data.u32[(x)>>2])
#define npk_sth_reg32(x) (npk_csr[NPK_CSR_STH].data.u32[(x)>>2])
#define npk_msc0_reg32(x) (npk_csr[NPK_CSR_MSC0].data.u32[(x)>>2])
#define npk_msc1_reg32(x) (npk_csr[NPK_CSR_MSC1].data.u32[(x)>>2])
#define npk_pti_reg32(x) (npk_csr[NPK_CSR_PTI].data.u32[(x)>>2])
/* the registers in CSR */
static uint8_t _npk_gth_reg[NPK_CSR_GTH_SZ];
static uint8_t _npk_sth_reg[NPK_CSR_STH_SZ];
static uint8_t _npk_msc0_reg[NPK_CSR_MSC0_SZ];
static uint8_t _npk_msc1_reg[NPK_CSR_MSC1_SZ];
static uint8_t _npk_pti_reg[NPK_CSR_PTI_SZ];
static struct npk_regs npk_csr[NPK_CSR_LAST] = {
/* GTH */
{ NPK_CSR_GTH_BASE, NPK_CSR_GTH_SZ, { _npk_gth_reg } },
/* STH */
{ NPK_CSR_STH_BASE, NPK_CSR_STH_SZ, { _npk_sth_reg } },
/* MSC0 */
{ NPK_CSR_MSC0_BASE, NPK_CSR_MSC0_SZ, { _npk_msc0_reg } },
/* MSC1 */
{ NPK_CSR_MSC1_BASE, NPK_CSR_MSC1_SZ, { _npk_msc1_reg } },
/* PTI */
{ NPK_CSR_PTI_BASE, NPK_CSR_PTI_SZ, { _npk_pti_reg } }
};
/* the default values are from intel_th developer's manual */
static struct npk_reg_default_val regs_default_val[] = {
{ NPK_CSR_GTH, NPK_CSR_GTHOPT0, 0x00040101},
{ NPK_CSR_MSC0, NPK_CSR_MSCxCTL, 0x00000300},
{ NPK_CSR_MSC1, NPK_CSR_MSCxCTL, 0x00000300}
};
#define regs_default_val_num (sizeof(regs_default_val) / \
sizeof(struct npk_reg_default_val))
static int npk_in_use;
static uint64_t sw_bar_base;
/* get the pointer to the register based on the offset */
static inline uint32_t *offset2reg(uint64_t offset)
{
uint32_t *reg = NULL, i;
struct npk_regs *regs;
/* traverse the npk_csr to find the correct one */
for (i = NPK_CSR_FIRST; i < NPK_CSR_LAST; i++) {
regs = &npk_csr[i];
if (offset >= regs->base && offset < regs->base + regs->size) {
reg = regs->data.u32 + ((offset - regs->base) >> 2);
break;
}
}
return reg;
}
static inline int valid_param(uint32_t m_off, uint32_t m_num)
{
/* 8-aligned, no less than 8, no overflow */
if (((m_off & 0x7U) == 0) && ((m_num & 0x7U) == 0) && (m_off > 0x7U)
&& (m_num > 0x7U) && (m_off + m_num <= NPK_SW_MSTR_NUM))
return 1;
return 0;
}
/*
* Set up a bar for CSR, and some values are initialized based on the
* parameters, for example, the total number of Masters for the UOS.
* Set up a bar for STMR, and map part of the physical STMR to it with
* an offset, according to the parameters.
*/
static int pci_npk_init(struct vmctx *ctx, struct pci_vdev *dev, char *opts)
{
int i, b, s, f, fd, ret, rc, error = -1;
DIR *dir;
struct dirent *dent;
char name[PATH_MAX];
uint8_t h_cfg[PCI_REGMAX + 1];
uint32_t m_off, m_num;
struct npk_reg_default_val *d;
char *cp;
if (npk_in_use) {
WPRINTF(("NPK is already in use\n"));
return error;
}
npk_in_use = 1;
/*
* CSR (bar#0): emulate it for guests using npk_csr
*
* STMR (bar#2): map the host MMIO space to guests with an offset
*
* +--NPK_SW_MSTR_STRT +--m_off NPK_SW_MSTR_STP--+
* | +----- m_num ------+ |
* v v v v
* +--------------------+--------------------+-------------------+
* | | | |
* | Reserved for SOS | Mapped for UOS#x | |
* | | | |
* +--------------------+--------------------+-------------------+
* ^ ^
* | |
* +--sw_bar for host +--sw_bar for UOS#x
*/
/* get the master offset and the number for this guest */
if ((opts == NULL) || dm_strtoui(opts, &cp, 10, &m_off) || *cp != '/' ||
dm_strtoui(cp + 1, &cp, 10, &m_num) || !valid_param(m_off, m_num)) {
m_off = 256;
m_num = 256;
}
/* check if the intel_th_pci driver is loaded */
dir = opendir(NPK_DRV_SYSFS_PATH);
if (dir == NULL) {
WPRINTF(("NPK driver not loaded\n"));
return error;
}
/* traverse the driver folder, and try to find the NPK BDF# */
while ((dent = readdir(dir)) != NULL) {
if (strncmp(dent->d_name, "0000:", 5) != 0 ||
parse_bdf((dent->d_name + 5), &b, &s, &f, 16) != 0)
continue;
else
break;
}
closedir(dir);
if (!dent) {
WPRINTF(("Cannot find NPK device\n"));
return error;
}
/* read the host NPK configuration space */
rc = snprintf(name, PATH_MAX, "%s/%s/config", NPK_DRV_SYSFS_PATH,
dent->d_name);
if (rc > PATH_MAX)
WPRINTF(("NPK device name too long\n"));
fd = open(name, O_RDONLY);
if (fd == -1) {
WPRINTF(("Cannot open host NPK config\n"));
return error;
}
ret = pread(fd, h_cfg, PCI_REGMAX + 1, 0);
close(fd);
if (ret < PCI_REGMAX + 1) {
WPRINTF(("Cannot read host NPK config\n"));
return error;
}
/* initialize the configuration space */
pci_set_cfgdata16(dev, PCIR_VENDOR, *(uint16_t *)&h_cfg[PCIR_VENDOR]);
pci_set_cfgdata16(dev, PCIR_DEVICE, *(uint16_t *)&h_cfg[PCIR_DEVICE]);
pci_set_cfgdata16(dev, PCIR_REVID, *(uint16_t *)&h_cfg[PCIR_REVID]);
pci_set_cfgdata8(dev, PCIR_CLASS, h_cfg[PCIR_CLASS]);
/* get the host base of NPK bar#2, plus the offset for the guest */
sw_bar_base = *(uint32_t *)&h_cfg[PCIR_BAR(2)] & PCIM_BAR_MEM_BASE;
sw_bar_base += NPK_MSTR_TO_MEM_SZ(m_off);
/* allocate the bar#0 (CSR)*/
error = pci_emul_alloc_bar(dev, 0, PCIBAR_MEM64, NPK_CSR_MTB_BAR_SZ);
if (error) {
WPRINTF(("Cannot alloc bar#0 for the guest\n"));
return error;
}
/* allocate the bar#2 (STMR)*/
error = pci_emul_alloc_pbar(dev, 2, sw_bar_base, PCIBAR_MEM64,
NPK_MSTR_TO_MEM_SZ(m_num));
if (error) {
WPRINTF(("Cannot alloc bar#2 for the guest\n"));
return error;
}
/*
* map this part of STMR to the guest so that the traces from UOS are
* written directly to it.
*/
error = vm_map_ptdev_mmio(ctx, dev->bus, dev->slot, dev->func,
dev->bar[2].addr, dev->bar[2].size, sw_bar_base);
if (error) {
WPRINTF(("Cannot Map the address to the guest MMIO space\n"));
return error;
}
/* setup default values for some registers */
for (i = 0; i < regs_default_val_num; i++) {
d = &regs_default_val[i];
npk_csr[d->csr].data.u32[d->offset >> 2] = d->default_val;
}
/* setup the SW Master Start/Stop and Channels per Master for UOS */
npk_sth_reg32(NPK_CSR_STHCAP0) = NPK_SW_MSTR_STRT |
((m_num + NPK_SW_MSTR_STRT - 1) << 16);
npk_sth_reg32(NPK_CSR_STHCAP1) = ((NPK_SW_MSTR_STRT - 1) << 24) |
NPK_CHANNELS_PER_MSTR;
/* set Pipe Line Empty for GTH/MSCx State */
npk_gth_reg(NPK_CSR_GTHSTAT) = NPK_CSR_GTHSTAT_PLE;
npk_msc0_reg32(NPK_CSR_MSCxSTS) = NPK_CSR_MSCxSTS_PLE;
npk_msc1_reg32(NPK_CSR_MSCxSTS) = NPK_CSR_MSCxSTS_PLE;
DPRINTF(("NPK[%x:%x:%x] h_bar#2@0x%lx g_bar#2@0x%lx[0x%lx] m+%d[%d]\n",
b, s, f, sw_bar_base, dev->bar[2].addr,
dev->bar[2].size, m_off, m_num));
return 0;
}
static void pci_npk_deinit(struct vmctx *ctx, struct pci_vdev *dev, char *opts)
{
vm_unmap_ptdev_mmio(ctx, dev->bus, dev->slot, dev->func,
dev->bar[2].addr, dev->bar[2].size, sw_bar_base);
npk_in_use = 0;
}
/* the CSR configuration from UOS will not take effect on the physical NPK */
static void pci_npk_write(struct vmctx *ctx, int vcpu, struct pci_vdev *dev,
int baridx, uint64_t offset, int size, uint64_t value)
{
uint32_t *reg;
DPRINTF(("W %d +0x%lx[%d] val 0x%lx\n", baridx, offset, size, value));
if (baridx != 0 || (offset & 0x3) || size != 4)
return;
/* try to set the register value in npk_csr */
reg = offset2reg(offset);
if (reg)
*reg = (uint32_t)value;
}
static uint64_t pci_npk_read(struct vmctx *ctx, int vcpu, struct pci_vdev *dev,
int baridx, uint64_t offset, int size)
{
uint32_t *reg, val = 0;
DPRINTF(("R %d +0x%lx[%d] val 0x%x\n", baridx, offset, size, val));
if (baridx != 0 || (offset & 0x3) || size != 4)
return (uint64_t)val;
/* try to get the register value from npk_csr */
reg = offset2reg(offset);
if (reg)
val = *reg;
return (uint64_t)val;
}
struct pci_vdev_ops pci_ops_npk = {
.class_name = "npk",
.vdev_init = pci_npk_init,
.vdev_deinit = pci_npk_deinit,
.vdev_barwrite = pci_npk_write,
.vdev_barread = pci_npk_read,
};
DEFINE_PCI_DEVTYPE(pci_ops_npk);
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