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95ea663693
qemu-e2k/tests/libqos/ahci.c
John Snow 95ea663693 libqos/ahci: fix memory management bugs 
There's a handful of trivial bugs in the libqos/ahci functions,
squish them together.

- Zero cached pointers after freeing them
- The Command List Buffer is an array of 32x 32 byte structures, not
  32x 8 byte pointers -- it's 1MiB, not 256 bytes. Zero it ALL.
- Free the correct command in ahci_pick_cmd.

Signed-off-by: John Snow <jsnow@redhat.com>
Message-id: 1434470575-21625-4-git-send-email-jsnow@redhat.com
2015-07-04 02:06:02 -04:00

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/*
* libqos AHCI functions
*
* Copyright (c) 2014 John Snow <jsnow@redhat.com>
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include <glib.h>
#include "libqtest.h"
#include "libqos/ahci.h"
#include "libqos/pci-pc.h"
#include "qemu-common.h"
#include "qemu/host-utils.h"
#include "hw/pci/pci_ids.h"
#include "hw/pci/pci_regs.h"
typedef struct AHCICommandProp {
uint8_t cmd; /* Command Code */
bool data; /* Data transfer command? */
bool pio;
bool dma;
bool lba28;
bool lba48;
bool read;
bool write;
bool atapi;
bool ncq;
uint64_t size; /* Static transfer size, for commands like IDENTIFY. */
uint32_t interrupts; /* Expected interrupts for this command. */
} AHCICommandProp;
AHCICommandProp ahci_command_properties[] = {
{ .cmd = CMD_READ_PIO, .data = true, .pio = true,
.lba28 = true, .read = true },
{ .cmd = CMD_WRITE_PIO, .data = true, .pio = true,
.lba28 = true, .write = true },
{ .cmd = CMD_READ_PIO_EXT, .data = true, .pio = true,
.lba48 = true, .read = true },
{ .cmd = CMD_WRITE_PIO_EXT, .data = true, .pio = true,
.lba48 = true, .write = true },
{ .cmd = CMD_READ_DMA, .data = true, .dma = true,
.lba28 = true, .read = true },
{ .cmd = CMD_WRITE_DMA, .data = true, .dma = true,
.lba28 = true, .write = true },
{ .cmd = CMD_READ_DMA_EXT, .data = true, .dma = true,
.lba48 = true, .read = true },
{ .cmd = CMD_WRITE_DMA_EXT, .data = true, .dma = true,
.lba48 = true, .write = true },
{ .cmd = CMD_IDENTIFY, .data = true, .pio = true,
.size = 512, .read = true },
{ .cmd = CMD_READ_MAX, .lba28 = true },
{ .cmd = CMD_READ_MAX_EXT, .lba48 = true },
{ .cmd = CMD_FLUSH_CACHE, .data = false }
};
/**
* Allocate space in the guest using information in the AHCIQState object.
*/
uint64_t ahci_alloc(AHCIQState *ahci, size_t bytes)
{
g_assert(ahci);
g_assert(ahci->parent);
return qmalloc(ahci->parent, bytes);
}
void ahci_free(AHCIQState *ahci, uint64_t addr)
{
g_assert(ahci);
g_assert(ahci->parent);
qfree(ahci->parent, addr);
}
/**
* Locate, verify, and return a handle to the AHCI device.
*/
QPCIDevice *get_ahci_device(uint32_t *fingerprint)
{
QPCIDevice *ahci;
uint32_t ahci_fingerprint;
QPCIBus *pcibus;
pcibus = qpci_init_pc();
/* Find the AHCI PCI device and verify it's the right one. */
ahci = qpci_device_find(pcibus, QPCI_DEVFN(0x1F, 0x02));
g_assert(ahci != NULL);
ahci_fingerprint = qpci_config_readl(ahci, PCI_VENDOR_ID);
switch (ahci_fingerprint) {
case AHCI_INTEL_ICH9:
break;
default:
/* Unknown device. */
g_assert_not_reached();
}
if (fingerprint) {
*fingerprint = ahci_fingerprint;
}
return ahci;
}
void free_ahci_device(QPCIDevice *dev)
{
QPCIBus *pcibus = dev ? dev->bus : NULL;
/* libqos doesn't have a function for this, so free it manually */
g_free(dev);
qpci_free_pc(pcibus);
}
/* Free all memory in-use by the AHCI device. */
void ahci_clean_mem(AHCIQState *ahci)
{
uint8_t port, slot;
for (port = 0; port < 32; ++port) {
if (ahci->port[port].fb) {
ahci_free(ahci, ahci->port[port].fb);
ahci->port[port].fb = 0;
}
if (ahci->port[port].clb) {
for (slot = 0; slot < 32; slot++) {
ahci_destroy_command(ahci, port, slot);
}
ahci_free(ahci, ahci->port[port].clb);
ahci->port[port].clb = 0;
}
}
}
/*** Logical Device Initialization ***/
/**
* Start the PCI device and sanity-check default operation.
*/
void ahci_pci_enable(AHCIQState *ahci)
{
uint8_t reg;
start_ahci_device(ahci);
switch (ahci->fingerprint) {
case AHCI_INTEL_ICH9:
/* ICH9 has a register at PCI 0x92 that
* acts as a master port enabler mask. */
reg = qpci_config_readb(ahci->dev, 0x92);
reg |= 0x3F;
qpci_config_writeb(ahci->dev, 0x92, reg);
/* 0...0111111b -- bit significant, ports 0-5 enabled. */
ASSERT_BIT_SET(qpci_config_readb(ahci->dev, 0x92), 0x3F);
break;
}
}
/**
* Map BAR5/ABAR, and engage the PCI device.
*/
void start_ahci_device(AHCIQState *ahci)
{
/* Map AHCI's ABAR (BAR5) */
ahci->hba_base = qpci_iomap(ahci->dev, 5, &ahci->barsize);
g_assert(ahci->hba_base);
/* turns on pci.cmd.iose, pci.cmd.mse and pci.cmd.bme */
qpci_device_enable(ahci->dev);
}
/**
* Test and initialize the AHCI's HBA memory areas.
* Initialize and start any ports with devices attached.
* Bring the HBA into the idle state.
*/
void ahci_hba_enable(AHCIQState *ahci)
{
/* Bits of interest in this section:
* GHC.AE Global Host Control / AHCI Enable
* PxCMD.ST Port Command: Start
* PxCMD.SUD "Spin Up Device"
* PxCMD.POD "Power On Device"
* PxCMD.FRE "FIS Receive Enable"
* PxCMD.FR "FIS Receive Running"
* PxCMD.CR "Command List Running"
*/
uint32_t reg, ports_impl;
uint16_t i;
uint8_t num_cmd_slots;
g_assert(ahci != NULL);
/* Set GHC.AE to 1 */
ahci_set(ahci, AHCI_GHC, AHCI_GHC_AE);
reg = ahci_rreg(ahci, AHCI_GHC);
ASSERT_BIT_SET(reg, AHCI_GHC_AE);
/* Cache CAP and CAP2. */
ahci->cap = ahci_rreg(ahci, AHCI_CAP);
ahci->cap2 = ahci_rreg(ahci, AHCI_CAP2);
/* Read CAP.NCS, how many command slots do we have? */
num_cmd_slots = ((ahci->cap & AHCI_CAP_NCS) >> ctzl(AHCI_CAP_NCS)) + 1;
g_test_message("Number of Command Slots: %u", num_cmd_slots);
/* Determine which ports are implemented. */
ports_impl = ahci_rreg(ahci, AHCI_PI);
for (i = 0; ports_impl; ports_impl >>= 1, ++i) {
if (!(ports_impl & 0x01)) {
continue;
}
g_test_message("Initializing port %u", i);
reg = ahci_px_rreg(ahci, i, AHCI_PX_CMD);
if (BITCLR(reg, AHCI_PX_CMD_ST | AHCI_PX_CMD_CR |
AHCI_PX_CMD_FRE | AHCI_PX_CMD_FR)) {
g_test_message("port is idle");
} else {
g_test_message("port needs to be idled");
ahci_px_clr(ahci, i, AHCI_PX_CMD,
(AHCI_PX_CMD_ST | AHCI_PX_CMD_FRE));
/* The port has 500ms to disengage. */
usleep(500000);
reg = ahci_px_rreg(ahci, i, AHCI_PX_CMD);
ASSERT_BIT_CLEAR(reg, AHCI_PX_CMD_CR);
ASSERT_BIT_CLEAR(reg, AHCI_PX_CMD_FR);
g_test_message("port is now idle");
/* The spec does allow for possibly needing a PORT RESET
* or HBA reset if we fail to idle the port. */
}
/* Allocate Memory for the Command List Buffer & FIS Buffer */
/* PxCLB space ... 0x20 per command, as in 4.2.2 p 36 */
ahci->port[i].clb = ahci_alloc(ahci, num_cmd_slots * 0x20);
qmemset(ahci->port[i].clb, 0x00, num_cmd_slots * 0x20);
g_test_message("CLB: 0x%08" PRIx64, ahci->port[i].clb);
ahci_px_wreg(ahci, i, AHCI_PX_CLB, ahci->port[i].clb);
g_assert_cmphex(ahci->port[i].clb, ==,
ahci_px_rreg(ahci, i, AHCI_PX_CLB));
/* PxFB space ... 0x100, as in 4.2.1 p 35 */
ahci->port[i].fb = ahci_alloc(ahci, 0x100);
qmemset(ahci->port[i].fb, 0x00, 0x100);
g_test_message("FB: 0x%08" PRIx64, ahci->port[i].fb);
ahci_px_wreg(ahci, i, AHCI_PX_FB, ahci->port[i].fb);
g_assert_cmphex(ahci->port[i].fb, ==,
ahci_px_rreg(ahci, i, AHCI_PX_FB));
/* Clear PxSERR, PxIS, then IS.IPS[x] by writing '1's. */
ahci_px_wreg(ahci, i, AHCI_PX_SERR, 0xFFFFFFFF);
ahci_px_wreg(ahci, i, AHCI_PX_IS, 0xFFFFFFFF);
ahci_wreg(ahci, AHCI_IS, (1 << i));
/* Verify Interrupts Cleared */
reg = ahci_px_rreg(ahci, i, AHCI_PX_SERR);
g_assert_cmphex(reg, ==, 0);
reg = ahci_px_rreg(ahci, i, AHCI_PX_IS);
g_assert_cmphex(reg, ==, 0);
reg = ahci_rreg(ahci, AHCI_IS);
ASSERT_BIT_CLEAR(reg, (1 << i));
/* Enable All Interrupts: */
ahci_px_wreg(ahci, i, AHCI_PX_IE, 0xFFFFFFFF);
reg = ahci_px_rreg(ahci, i, AHCI_PX_IE);
g_assert_cmphex(reg, ==, ~((uint32_t)AHCI_PX_IE_RESERVED));
/* Enable the FIS Receive Engine. */
ahci_px_set(ahci, i, AHCI_PX_CMD, AHCI_PX_CMD_FRE);
reg = ahci_px_rreg(ahci, i, AHCI_PX_CMD);
ASSERT_BIT_SET(reg, AHCI_PX_CMD_FR);
/* AHCI 1.3 spec: if !STS.BSY, !STS.DRQ and PxSSTS.DET indicates
* physical presence, a device is present and may be started. However,
* PxSERR.DIAG.X /may/ need to be cleared a priori. */
reg = ahci_px_rreg(ahci, i, AHCI_PX_SERR);
if (BITSET(reg, AHCI_PX_SERR_DIAG_X)) {
ahci_px_set(ahci, i, AHCI_PX_SERR, AHCI_PX_SERR_DIAG_X);
}
reg = ahci_px_rreg(ahci, i, AHCI_PX_TFD);
if (BITCLR(reg, AHCI_PX_TFD_STS_BSY | AHCI_PX_TFD_STS_DRQ)) {
reg = ahci_px_rreg(ahci, i, AHCI_PX_SSTS);
if ((reg & AHCI_PX_SSTS_DET) == SSTS_DET_ESTABLISHED) {
/* Device Found: set PxCMD.ST := 1 */
ahci_px_set(ahci, i, AHCI_PX_CMD, AHCI_PX_CMD_ST);
ASSERT_BIT_SET(ahci_px_rreg(ahci, i, AHCI_PX_CMD),
AHCI_PX_CMD_CR);
g_test_message("Started Device %u", i);
} else if ((reg & AHCI_PX_SSTS_DET)) {
/* Device present, but in some unknown state. */
g_assert_not_reached();
}
}
}
/* Enable GHC.IE */
ahci_set(ahci, AHCI_GHC, AHCI_GHC_IE);
reg = ahci_rreg(ahci, AHCI_GHC);
ASSERT_BIT_SET(reg, AHCI_GHC_IE);
/* TODO: The device should now be idling and waiting for commands.
* In the future, a small test-case to inspect the Register D2H FIS
* and clear the initial interrupts might be good. */
}
/**
* Pick the first implemented and running port
*/
unsigned ahci_port_select(AHCIQState *ahci)
{
uint32_t ports, reg;
unsigned i;
ports = ahci_rreg(ahci, AHCI_PI);
for (i = 0; i < 32; ports >>= 1, ++i) {
if (ports == 0) {
i = 32;
}
if (!(ports & 0x01)) {
continue;
}
reg = ahci_px_rreg(ahci, i, AHCI_PX_CMD);
if (BITSET(reg, AHCI_PX_CMD_ST)) {
break;
}
}
g_assert(i < 32);
return i;
}
/**
* Clear a port's interrupts and status information prior to a test.
*/
void ahci_port_clear(AHCIQState *ahci, uint8_t port)
{
uint32_t reg;
/* Clear out this port's interrupts (ignore the init register d2h fis) */
reg = ahci_px_rreg(ahci, port, AHCI_PX_IS);
ahci_px_wreg(ahci, port, AHCI_PX_IS, reg);
g_assert_cmphex(ahci_px_rreg(ahci, port, AHCI_PX_IS), ==, 0);
/* Wipe the FIS-Receive Buffer */
qmemset(ahci->port[port].fb, 0x00, 0x100);
}
/**
* Check a port for errors.
*/
void ahci_port_check_error(AHCIQState *ahci, uint8_t port)
{
uint32_t reg;
/* The upper 9 bits of the IS register all indicate errors. */
reg = ahci_px_rreg(ahci, port, AHCI_PX_IS);
reg >>= 23;
g_assert_cmphex(reg, ==, 0);
/* The Sata Error Register should be empty. */
reg = ahci_px_rreg(ahci, port, AHCI_PX_SERR);
g_assert_cmphex(reg, ==, 0);
/* The TFD also has two error sections. */
reg = ahci_px_rreg(ahci, port, AHCI_PX_TFD);
ASSERT_BIT_CLEAR(reg, AHCI_PX_TFD_STS_ERR);
ASSERT_BIT_CLEAR(reg, AHCI_PX_TFD_ERR);
}
void ahci_port_check_interrupts(AHCIQState *ahci, uint8_t port,
uint32_t intr_mask)
{
uint32_t reg;
/* Check for expected interrupts */
reg = ahci_px_rreg(ahci, port, AHCI_PX_IS);
ASSERT_BIT_SET(reg, intr_mask);
/* Clear expected interrupts and assert all interrupts now cleared. */
ahci_px_wreg(ahci, port, AHCI_PX_IS, intr_mask);
g_assert_cmphex(ahci_px_rreg(ahci, port, AHCI_PX_IS), ==, 0);
}
void ahci_port_check_nonbusy(AHCIQState *ahci, uint8_t port, uint8_t slot)
{
uint32_t reg;
/* Assert that the command slot is no longer busy (NCQ) */
reg = ahci_px_rreg(ahci, port, AHCI_PX_SACT);
ASSERT_BIT_CLEAR(reg, (1 << slot));
/* Non-NCQ */
reg = ahci_px_rreg(ahci, port, AHCI_PX_CI);
ASSERT_BIT_CLEAR(reg, (1 << slot));
/* And assert that we are generally not busy. */
reg = ahci_px_rreg(ahci, port, AHCI_PX_TFD);
ASSERT_BIT_CLEAR(reg, AHCI_PX_TFD_STS_BSY);
ASSERT_BIT_CLEAR(reg, AHCI_PX_TFD_STS_DRQ);
}
void ahci_port_check_d2h_sanity(AHCIQState *ahci, uint8_t port, uint8_t slot)
{
RegD2HFIS *d2h = g_malloc0(0x20);
uint32_t reg;
memread(ahci->port[port].fb + 0x40, d2h, 0x20);
g_assert_cmphex(d2h->fis_type, ==, 0x34);
reg = ahci_px_rreg(ahci, port, AHCI_PX_TFD);
g_assert_cmphex((reg & AHCI_PX_TFD_ERR) >> 8, ==, d2h->error);
g_assert_cmphex((reg & AHCI_PX_TFD_STS), ==, d2h->status);
g_free(d2h);
}
void ahci_port_check_pio_sanity(AHCIQState *ahci, uint8_t port,
uint8_t slot, size_t buffsize)
{
PIOSetupFIS *pio = g_malloc0(0x20);
/* We cannot check the Status or E_Status registers, because
* the status may have again changed between the PIO Setup FIS
* and the conclusion of the command with the D2H Register FIS. */
memread(ahci->port[port].fb + 0x20, pio, 0x20);
g_assert_cmphex(pio->fis_type, ==, 0x5f);
/* BUG: PIO Setup FIS as utilized by QEMU tries to fit the entire
* transfer size in a uint16_t field. The maximum transfer size can
* eclipse this; the field is meant to convey the size of data per
* each Data FIS, not the entire operation as a whole. For now,
* we will sanity check the broken case where applicable. */
if (buffsize <= UINT16_MAX) {
g_assert_cmphex(le16_to_cpu(pio->tx_count), ==, buffsize);
}
g_free(pio);
}
void ahci_port_check_cmd_sanity(AHCIQState *ahci, uint8_t port,
uint8_t slot, size_t buffsize)
{
AHCICommandHeader cmd;
ahci_get_command_header(ahci, port, slot, &cmd);
g_assert_cmphex(buffsize, ==, cmd.prdbc);
}
/* Get the command in #slot of port #port. */
void ahci_get_command_header(AHCIQState *ahci, uint8_t port,
uint8_t slot, AHCICommandHeader *cmd)
{
uint64_t ba = ahci->port[port].clb;
ba += slot * sizeof(AHCICommandHeader);
memread(ba, cmd, sizeof(AHCICommandHeader));
cmd->flags = le16_to_cpu(cmd->flags);
cmd->prdtl = le16_to_cpu(cmd->prdtl);
cmd->prdbc = le32_to_cpu(cmd->prdbc);
cmd->ctba = le64_to_cpu(cmd->ctba);
}
/* Set the command in #slot of port #port. */
void ahci_set_command_header(AHCIQState *ahci, uint8_t port,
uint8_t slot, AHCICommandHeader *cmd)
{
AHCICommandHeader tmp = { .flags = 0 };
uint64_t ba = ahci->port[port].clb;
ba += slot * sizeof(AHCICommandHeader);
tmp.flags = cpu_to_le16(cmd->flags);
tmp.prdtl = cpu_to_le16(cmd->prdtl);
tmp.prdbc = cpu_to_le32(cmd->prdbc);
tmp.ctba = cpu_to_le64(cmd->ctba);
memwrite(ba, &tmp, sizeof(AHCICommandHeader));
}
void ahci_destroy_command(AHCIQState *ahci, uint8_t port, uint8_t slot)
{
AHCICommandHeader cmd;
/* Obtain the Nth Command Header */
ahci_get_command_header(ahci, port, slot, &cmd);
if (cmd.ctba == 0) {
/* No address in it, so just return -- it's empty. */
goto tidy;
}
/* Free the Table */
ahci_free(ahci, cmd.ctba);
tidy:
/* NULL the header. */
memset(&cmd, 0x00, sizeof(cmd));
ahci_set_command_header(ahci, port, slot, &cmd);
ahci->port[port].ctba[slot] = 0;
ahci->port[port].prdtl[slot] = 0;
}
void ahci_write_fis(AHCIQState *ahci, RegH2DFIS *fis, uint64_t addr)
{
RegH2DFIS tmp = *fis;
/* The auxiliary FIS fields are defined per-command and are not
* currently implemented in libqos/ahci.o, but may or may not need
* to be flipped. */
/* All other FIS fields are 8 bit and do not need to be flipped. */
tmp.count = cpu_to_le16(tmp.count);
memwrite(addr, &tmp, sizeof(tmp));
}
unsigned ahci_pick_cmd(AHCIQState *ahci, uint8_t port)
{
unsigned i;
unsigned j;
uint32_t reg;
reg = ahci_px_rreg(ahci, port, AHCI_PX_CI);
/* Pick the least recently used command slot that's available */
for (i = 0; i < 32; ++i) {
j = ((ahci->port[port].next + i) % 32);
if (reg & (1 << j)) {
continue;
}
ahci_destroy_command(ahci, port, j);
ahci->port[port].next = (j + 1) % 32;
return j;
}
g_test_message("All command slots were busy.");
g_assert_not_reached();
}
inline unsigned size_to_prdtl(unsigned bytes, unsigned bytes_per_prd)
{
/* Each PRD can describe up to 4MiB */
g_assert_cmphex(bytes_per_prd, <=, 4096 * 1024);
g_assert_cmphex(bytes_per_prd & 0x01, ==, 0x00);
return (bytes + bytes_per_prd - 1) / bytes_per_prd;
}
/* Issue a command, expecting it to fail and STOP the VM */
AHCICommand *ahci_guest_io_halt(AHCIQState *ahci, uint8_t port,
uint8_t ide_cmd, uint64_t buffer,
size_t bufsize, uint64_t sector)
{
AHCICommand *cmd;
cmd = ahci_command_create(ide_cmd);
ahci_command_adjust(cmd, sector, buffer, bufsize, 0);
ahci_command_commit(ahci, cmd, port);
ahci_command_issue_async(ahci, cmd);
qmp_eventwait("STOP");
return cmd;
}
/* Resume a previously failed command and verify/finalize */
void ahci_guest_io_resume(AHCIQState *ahci, AHCICommand *cmd)
{
/* Complete the command */
qmp_async("{'execute':'cont' }");
qmp_eventwait("RESUME");
ahci_command_wait(ahci, cmd);
ahci_command_verify(ahci, cmd);
ahci_command_free(cmd);
}
/* Given a guest buffer address, perform an IO operation */
void ahci_guest_io(AHCIQState *ahci, uint8_t port, uint8_t ide_cmd,
uint64_t buffer, size_t bufsize, uint64_t sector)
{
AHCICommand *cmd;
cmd = ahci_command_create(ide_cmd);
ahci_command_set_buffer(cmd, buffer);
ahci_command_set_size(cmd, bufsize);
if (sector) {
ahci_command_set_offset(cmd, sector);
}
ahci_command_commit(ahci, cmd, port);
ahci_command_issue(ahci, cmd);
ahci_command_verify(ahci, cmd);
ahci_command_free(cmd);
}
struct AHCICommand {
/* Test Management Data */
uint8_t name;
uint8_t port;
uint8_t slot;
uint32_t interrupts;
uint64_t xbytes;
uint32_t prd_size;
uint64_t buffer;
AHCICommandProp *props;
/* Data to be transferred to the guest */
AHCICommandHeader header;
RegH2DFIS fis;
void *atapi_cmd;
};
static AHCICommandProp *ahci_command_find(uint8_t command_name)
{
int i;
for (i = 0; i < ARRAY_SIZE(ahci_command_properties); i++) {
if (ahci_command_properties[i].cmd == command_name) {
return &ahci_command_properties[i];
}
}
return NULL;
}
/* Given a HOST buffer, create a buffer address and perform an IO operation. */
void ahci_io(AHCIQState *ahci, uint8_t port, uint8_t ide_cmd,
void *buffer, size_t bufsize, uint64_t sector)
{
uint64_t ptr;
AHCICommandProp *props;
props = ahci_command_find(ide_cmd);
g_assert(props);
ptr = ahci_alloc(ahci, bufsize);
g_assert(ptr);
qmemset(ptr, 0x00, bufsize);
if (props->write) {
bufwrite(ptr, buffer, bufsize);
}
ahci_guest_io(ahci, port, ide_cmd, ptr, bufsize, sector);
if (props->read) {
bufread(ptr, buffer, bufsize);
}
ahci_free(ahci, ptr);
}
/**
* Initializes a basic command header in memory.
* We assume that this is for an ATA command using RegH2DFIS.
*/
static void command_header_init(AHCICommand *cmd)
{
AHCICommandHeader *hdr = &cmd->header;
AHCICommandProp *props = cmd->props;
hdr->flags = 5; /* RegH2DFIS is 5 DW long. Must be < 32 */
hdr->flags |= CMDH_CLR_BSY; /* Clear the BSY bit when done */
if (props->write) {
hdr->flags |= CMDH_WRITE;
}
if (props->atapi) {
hdr->flags |= CMDH_ATAPI;
}
/* Other flags: PREFETCH, RESET, and BIST */
hdr->prdtl = size_to_prdtl(cmd->xbytes, cmd->prd_size);
hdr->prdbc = 0;
hdr->ctba = 0;
}
static void command_table_init(AHCICommand *cmd)
{
RegH2DFIS *fis = &(cmd->fis);
fis->fis_type = REG_H2D_FIS;
fis->flags = REG_H2D_FIS_CMD; /* "Command" bit */
fis->command = cmd->name;
cmd->fis.feature_low = 0x00;
cmd->fis.feature_high = 0x00;
if (cmd->props->lba28 || cmd->props->lba48) {
cmd->fis.device = ATA_DEVICE_LBA;
}
cmd->fis.count = (cmd->xbytes / AHCI_SECTOR_SIZE);
cmd->fis.icc = 0x00;
cmd->fis.control = 0x00;
memset(cmd->fis.aux, 0x00, ARRAY_SIZE(cmd->fis.aux));
}
AHCICommand *ahci_command_create(uint8_t command_name)
{
AHCICommandProp *props = ahci_command_find(command_name);
AHCICommand *cmd;
g_assert(props);
cmd = g_malloc0(sizeof(AHCICommand));
g_assert(!(props->dma && props->pio));
g_assert(!(props->lba28 && props->lba48));
g_assert(!(props->read && props->write));
g_assert(!props->size || props->data);
/* Defaults and book-keeping */
cmd->props = props;
cmd->name = command_name;
cmd->xbytes = props->size;
cmd->prd_size = 4096;
cmd->buffer = 0xabad1dea;
cmd->interrupts = AHCI_PX_IS_DHRS;
/* BUG: We expect the DPS interrupt for data commands */
/* cmd->interrupts |= props->data ? AHCI_PX_IS_DPS : 0; */
/* BUG: We expect the DMA Setup interrupt for DMA commands */
/* cmd->interrupts |= props->dma ? AHCI_PX_IS_DSS : 0; */
cmd->interrupts |= props->pio ? AHCI_PX_IS_PSS : 0;
command_header_init(cmd);
command_table_init(cmd);
return cmd;
}
void ahci_command_free(AHCICommand *cmd)
{
g_free(cmd);
}
void ahci_command_set_flags(AHCICommand *cmd, uint16_t cmdh_flags)
{
cmd->header.flags |= cmdh_flags;
}
void ahci_command_clr_flags(AHCICommand *cmd, uint16_t cmdh_flags)
{
cmd->header.flags &= ~cmdh_flags;
}
void ahci_command_set_offset(AHCICommand *cmd, uint64_t lba_sect)
{
RegH2DFIS *fis = &(cmd->fis);
if (cmd->props->lba28) {
g_assert_cmphex(lba_sect, <=, 0xFFFFFFF);
} else if (cmd->props->lba48) {
g_assert_cmphex(lba_sect, <=, 0xFFFFFFFFFFFF);
} else {
/* Can't set offset if we don't know the format. */
g_assert_not_reached();
}
/* LBA28 uses the low nibble of the device/control register for LBA24:27 */
fis->lba_lo[0] = (lba_sect & 0xFF);
fis->lba_lo[1] = (lba_sect >> 8) & 0xFF;
fis->lba_lo[2] = (lba_sect >> 16) & 0xFF;
if (cmd->props->lba28) {
fis->device = (fis->device & 0xF0) | ((lba_sect >> 24) & 0x0F);
}
fis->lba_hi[0] = (lba_sect >> 24) & 0xFF;
fis->lba_hi[1] = (lba_sect >> 32) & 0xFF;
fis->lba_hi[2] = (lba_sect >> 40) & 0xFF;
}
void ahci_command_set_buffer(AHCICommand *cmd, uint64_t buffer)
{
cmd->buffer = buffer;
}
void ahci_command_set_sizes(AHCICommand *cmd, uint64_t xbytes,
unsigned prd_size)
{
/* Each PRD can describe up to 4MiB, and must not be odd. */
g_assert_cmphex(prd_size, <=, 4096 * 1024);
g_assert_cmphex(prd_size & 0x01, ==, 0x00);
if (prd_size) {
cmd->prd_size = prd_size;
}
cmd->xbytes = xbytes;
cmd->fis.count = (cmd->xbytes / AHCI_SECTOR_SIZE);
cmd->header.prdtl = size_to_prdtl(cmd->xbytes, cmd->prd_size);
}
void ahci_command_set_size(AHCICommand *cmd, uint64_t xbytes)
{
ahci_command_set_sizes(cmd, xbytes, cmd->prd_size);
}
void ahci_command_set_prd_size(AHCICommand *cmd, unsigned prd_size)
{
ahci_command_set_sizes(cmd, cmd->xbytes, prd_size);
}
void ahci_command_adjust(AHCICommand *cmd, uint64_t offset, uint64_t buffer,
uint64_t xbytes, unsigned prd_size)
{
ahci_command_set_sizes(cmd, xbytes, prd_size);
ahci_command_set_buffer(cmd, buffer);
ahci_command_set_offset(cmd, offset);
}
void ahci_command_commit(AHCIQState *ahci, AHCICommand *cmd, uint8_t port)
{
uint16_t i, prdtl;
uint64_t table_size, table_ptr, remaining;
PRD prd;
/* This command is now tied to this port/command slot */
cmd->port = port;
cmd->slot = ahci_pick_cmd(ahci, port);
/* Create a buffer for the command table */
prdtl = size_to_prdtl(cmd->xbytes, cmd->prd_size);
table_size = CMD_TBL_SIZ(prdtl);
table_ptr = ahci_alloc(ahci, table_size);
g_assert(table_ptr);
/* AHCI 1.3: Must be aligned to 0x80 */
g_assert((table_ptr & 0x7F) == 0x00);
cmd->header.ctba = table_ptr;
/* Commit the command header and command FIS */
ahci_set_command_header(ahci, port, cmd->slot, &(cmd->header));
ahci_write_fis(ahci, &(cmd->fis), table_ptr);
/* Construct and write the PRDs to the command table */
g_assert_cmphex(prdtl, ==, cmd->header.prdtl);
remaining = cmd->xbytes;
for (i = 0; i < prdtl; ++i) {
prd.dba = cpu_to_le64(cmd->buffer + (cmd->prd_size * i));
prd.res = 0;
if (remaining > cmd->prd_size) {
/* Note that byte count is 0-based. */
prd.dbc = cpu_to_le32(cmd->prd_size - 1);
remaining -= cmd->prd_size;
} else {
/* Again, dbc is 0-based. */
prd.dbc = cpu_to_le32(remaining - 1);
remaining = 0;
}
prd.dbc |= cpu_to_le32(0x80000000); /* Request DPS Interrupt */
/* Commit the PRD entry to the Command Table */
memwrite(table_ptr + 0x80 + (i * sizeof(PRD)),
&prd, sizeof(PRD));
}
/* Bookmark the PRDTL and CTBA values */
ahci->port[port].ctba[cmd->slot] = table_ptr;
ahci->port[port].prdtl[cmd->slot] = prdtl;
}
void ahci_command_issue_async(AHCIQState *ahci, AHCICommand *cmd)
{
if (cmd->props->ncq) {
ahci_px_wreg(ahci, cmd->port, AHCI_PX_SACT, (1 << cmd->slot));
}
ahci_px_wreg(ahci, cmd->port, AHCI_PX_CI, (1 << cmd->slot));
}
void ahci_command_wait(AHCIQState *ahci, AHCICommand *cmd)
{
/* We can't rely on STS_BSY until the command has started processing.
* Therefore, we also use the Command Issue bit as indication of
* a command in-flight. */
while (BITSET(ahci_px_rreg(ahci, cmd->port, AHCI_PX_TFD),
AHCI_PX_TFD_STS_BSY) ||
BITSET(ahci_px_rreg(ahci, cmd->port, AHCI_PX_CI), (1 << cmd->slot))) {
usleep(50);
}
}
void ahci_command_issue(AHCIQState *ahci, AHCICommand *cmd)
{
ahci_command_issue_async(ahci, cmd);
ahci_command_wait(ahci, cmd);
}
void ahci_command_verify(AHCIQState *ahci, AHCICommand *cmd)
{
uint8_t slot = cmd->slot;
uint8_t port = cmd->port;
ahci_port_check_error(ahci, port);
ahci_port_check_interrupts(ahci, port, cmd->interrupts);
ahci_port_check_nonbusy(ahci, port, slot);
ahci_port_check_cmd_sanity(ahci, port, slot, cmd->xbytes);
ahci_port_check_d2h_sanity(ahci, port, slot);
if (cmd->props->pio) {
ahci_port_check_pio_sanity(ahci, port, slot, cmd->xbytes);
}
}
uint8_t ahci_command_slot(AHCICommand *cmd)
{
return cmd->slot;
}
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