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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] [PATCH V9 3/8] Introduce HostPCIDevice to access a pci device on the host.
On Wed, Mar 21, 2012 at 06:29:00PM +0000, Anthony PERARD wrote:
> Signed-off-by: Anthony PERARD <anthony.perard@xxxxxxxxxx>
> Acked-by: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>
Host is really linux sysfs, right?
Better reflect this in naming.
Or maybe even xen-host-pci-device?
> ---
> Makefile.target | 3 +
> hw/host-pci-device.c | 278
> ++++++++++++++++++++++++++++++++++++++++++++++++++
> hw/host-pci-device.h | 75 ++++++++++++++
> 3 files changed, 356 insertions(+), 0 deletions(-)
> create mode 100644 hw/host-pci-device.c
> create mode 100644 hw/host-pci-device.h
>
> diff --git a/Makefile.target b/Makefile.target
> index 63cf769..0ccfd5b 100644
> --- a/Makefile.target
> +++ b/Makefile.target
> @@ -232,6 +232,9 @@ obj-$(CONFIG_NO_XEN) += xen-stub.o
>
> obj-i386-$(CONFIG_XEN) += xen_platform.o
>
> +# Xen PCI Passthrough
> +obj-i386-$(CONFIG_XEN_PCI_PASSTHROUGH) += host-pci-device.o
> +
> # Inter-VM PCI shared memory
> CONFIG_IVSHMEM =
> ifeq ($(CONFIG_KVM), y)
> diff --git a/hw/host-pci-device.c b/hw/host-pci-device.c
> new file mode 100644
> index 0000000..3dacb30
> --- /dev/null
> +++ b/hw/host-pci-device.c
> @@ -0,0 +1,278 @@
> +/*
> + * Copyright (C) 2011 Citrix Ltd.
> + *
> + * This work is licensed under the terms of the GNU GPL, version 2. See
> + * the COPYING file in the top-level directory.
> + *
> + */
> +
> +#include "qemu-common.h"
> +#include "host-pci-device.h"
> +
> +#define PCI_MAX_EXT_CAP \
> + ((PCIE_CONFIG_SPACE_SIZE - PCI_CONFIG_SPACE_SIZE) / (PCI_CAP_SIZEOF + 4))
> +
> +enum error_code {
> + ERROR_SYNTAX = 1,
> +};
> +
> +static int path_to(const HostPCIDevice *d,
> + const char *name, char *buf, ssize_t size)
> +{
> + return snprintf(buf, size, "/sys/bus/pci/devices/%04x:%02x:%02x.%x/%s",
> + d->domain, d->bus, d->dev, d->func, name);
> +}
> +
> +static int get_resource(HostPCIDevice *d)
> +{
> + int i, rc = 0;
> + FILE *f;
> + char path[PATH_MAX];
> + unsigned long long start, end, flags, size;
> +
> + path_to(d, "resource", path, sizeof (path));
> + f = fopen(path, "r");
> + if (!f) {
> + fprintf(stderr, "Error: Can't open %s: %s\n", path, strerror(errno));
> + return -errno;
> + }
> +
> + for (i = 0; i < PCI_NUM_REGIONS; i++) {
> + if (fscanf(f, "%llx %llx %llx", &start, &end, &flags) != 3) {
> + fprintf(stderr, "Error: Syntax error in %s\n", path);
> + rc = ERROR_SYNTAX;
> + break;
> + }
> + if (start) {
> + size = end - start + 1;
> + } else {
> + size = 0;
> + }
> +
> + if (i < PCI_ROM_SLOT) {
> + d->io_regions[i].base_addr = start;
> + d->io_regions[i].size = size;
> + d->io_regions[i].flags = flags;
> + } else {
> + d->rom.base_addr = start;
> + d->rom.size = size;
> + d->rom.flags = flags;
> + }
> + }
> +
> + fclose(f);
> + return rc;
> +}
> +
> +static int get_hex_value(HostPCIDevice *d, const char *name,
> + unsigned long *pvalue)
> +{
> + char path[PATH_MAX];
> + FILE *f;
> + unsigned long value;
> +
> + path_to(d, name, path, sizeof (path));
> + f = fopen(path, "r");
> + if (!f) {
> + fprintf(stderr, "Error: Can't open %s: %s\n", path, strerror(errno));
> + return -errno;
> + }
> + if (fscanf(f, "%lx\n", &value) != 1) {
> + fprintf(stderr, "Error: Syntax error in %s\n", path);
> + fclose(f);
> + return ERROR_SYNTAX;
> + }
> + fclose(f);
> + *pvalue = value;
> + return 0;
> +}
> +
> +static bool pci_dev_is_virtfn(HostPCIDevice *d)
> +{
> + char path[PATH_MAX];
> + struct stat buf;
> +
> + path_to(d, "physfn", path, sizeof (path));
> + return !stat(path, &buf);
> +}
> +
> +static int host_pci_config_fd(HostPCIDevice *d)
> +{
> + char path[PATH_MAX];
> +
> + if (d->config_fd < 0) {
> + path_to(d, "config", path, sizeof (path));
> + d->config_fd = open(path, O_RDWR);
> + if (d->config_fd < 0) {
> + fprintf(stderr, "HostPCIDevice: Can not open '%s': %s\n",
> + path, strerror(errno));
> + }
> + }
> + return d->config_fd;
> +}
> +static int host_pci_config_read(HostPCIDevice *d, int pos, void *buf, int
> len)
> +{
> + int fd = host_pci_config_fd(d);
> + int res = 0;
> +
> +again:
> + res = pread(fd, buf, len, pos);
> + if (res != len) {
> + if (res < 0 && (errno == EINTR || errno == EAGAIN)) {
> + goto again;
> + }
> + fprintf(stderr, "%s: read failed: %s (fd: %i)\n",
> + __func__, strerror(errno), fd);
> + return -errno;
> + }
> + return 0;
> +}
> +static int host_pci_config_write(HostPCIDevice *d,
> + int pos, const void *buf, int len)
> +{
> + int fd = host_pci_config_fd(d);
> + int res = 0;
> +
> +again:
> + res = pwrite(fd, buf, len, pos);
> + if (res != len) {
> + if (res < 0 && (errno == EINTR || errno == EAGAIN)) {
> + goto again;
> + }
> + fprintf(stderr, "%s: write failed: %s\n",
> + __func__, strerror(errno));
> + return -errno;
> + }
> + return 0;
> +}
> +
> +int host_pci_get_byte(HostPCIDevice *d, int pos, uint8_t *p)
> +{
> + uint8_t buf;
> + int rc = host_pci_config_read(d, pos, &buf, 1);
> + if (rc == 0) {
> + *p = buf;
> + }
> + return rc;
> +}
> +int host_pci_get_word(HostPCIDevice *d, int pos, uint16_t *p)
> +{
> + uint16_t buf;
> + int rc = host_pci_config_read(d, pos, &buf, 2);
> + if (rc == 0) {
> + *p = le16_to_cpu(buf);
> + }
> + return rc;
> +}
> +int host_pci_get_long(HostPCIDevice *d, int pos, uint32_t *p)
> +{
> + uint32_t buf;
> + int rc = host_pci_config_read(d, pos, &buf, 4);
> + if (rc == 0) {
> + *p = le32_to_cpu(buf);
> + }
> + return rc;
> +}
> +int host_pci_get_block(HostPCIDevice *d, int pos, uint8_t *buf, int len)
> +{
> + return host_pci_config_read(d, pos, buf, len);
> +}
> +
> +int host_pci_set_byte(HostPCIDevice *d, int pos, uint8_t data)
> +{
> + return host_pci_config_write(d, pos, &data, 1);
> +}
> +int host_pci_set_word(HostPCIDevice *d, int pos, uint16_t data)
> +{
> + data = cpu_to_le16(data);
> + return host_pci_config_write(d, pos, &data, 2);
> +}
> +int host_pci_set_long(HostPCIDevice *d, int pos, uint32_t data)
> +{
> + data = cpu_to_le32(data);
> + return host_pci_config_write(d, pos, &data, 4);
> +}
> +int host_pci_set_block(HostPCIDevice *d, int pos, uint8_t *buf, int len)
> +{
> + return host_pci_config_write(d, pos, buf, len);
> +}
> +
> +uint32_t host_pci_find_ext_cap_offset(HostPCIDevice *d, uint32_t cap)
> +{
> + uint32_t header = 0;
> + int max_cap = PCI_MAX_EXT_CAP;
> + int pos = PCI_CONFIG_SPACE_SIZE;
> +
> + do {
> + if (host_pci_get_long(d, pos, &header)) {
> + break;
> + }
> + /*
> + * If we have no capabilities, this is indicated by cap ID,
> + * cap version and next pointer all being 0.
> + */
> + if (header == 0) {
> + break;
> + }
> +
> + if (PCI_EXT_CAP_ID(header) == cap) {
> + return pos;
> + }
> +
> + pos = PCI_EXT_CAP_NEXT(header);
> + if (pos < PCI_CONFIG_SPACE_SIZE) {
> + break;
> + }
> +
> + max_cap--;
> + } while (max_cap > 0);
> +
> + return 0;
> +}
> +
> +HostPCIDevice *host_pci_device_get(uint8_t bus, uint8_t dev, uint8_t func)
> +{
> + HostPCIDevice *d = NULL;
> + unsigned long v = 0;
> +
> + d = g_new0(HostPCIDevice, 1);
> +
> + d->config_fd = -1;
> + d->domain = 0;
> + d->bus = bus;
> + d->dev = dev;
> + d->func = func;
> +
> + if (host_pci_config_fd(d) == -1) {
> + goto error;
> + }
> + if (get_resource(d) != 0) {
> + goto error;
> + }
> +
> + if (get_hex_value(d, "vendor", &v)) {
> + goto error;
> + }
> + d->vendor_id = v;
> + if (get_hex_value(d, "device", &v)) {
> + goto error;
> + }
> + d->device_id = v;
> + d->is_virtfn = pci_dev_is_virtfn(d);
> +
> + return d;
> +error:
> + if (d->config_fd >= 0) {
> + close(d->config_fd);
> + }
> + g_free(d);
> + return NULL;
> +}
> +
> +void host_pci_device_put(HostPCIDevice *d)
> +{
> + if (d->config_fd >= 0) {
> + close(d->config_fd);
> + }
> + g_free(d);
> +}
> diff --git a/hw/host-pci-device.h b/hw/host-pci-device.h
> new file mode 100644
> index 0000000..c8880eb
> --- /dev/null
> +++ b/hw/host-pci-device.h
> @@ -0,0 +1,75 @@
> +#ifndef HW_HOST_PCI_DEVICE
> +# define HW_HOST_PCI_DEVICE
> +
> +#include "pci.h"
> +
> +/*
> + * from linux/ioport.h
> + * IO resources have these defined flags.
> + */
> +#define IORESOURCE_BITS 0x000000ff /* Bus-specific bits */
> +
> +#define IORESOURCE_TYPE_BITS 0x00000f00 /* Resource type */
> +#define IORESOURCE_IO 0x00000100
> +#define IORESOURCE_MEM 0x00000200
> +#define IORESOURCE_IRQ 0x00000400
> +#define IORESOURCE_DMA 0x00000800
> +
> +#define IORESOURCE_PREFETCH 0x00001000 /* No side effects */
> +#define IORESOURCE_READONLY 0x00002000
> +#define IORESOURCE_CACHEABLE 0x00004000
> +#define IORESOURCE_RANGELENGTH 0x00008000
> +#define IORESOURCE_SHADOWABLE 0x00010000
> +
> +#define IORESOURCE_SIZEALIGN 0x00020000 /* size indicates alignment
> */
> +#define IORESOURCE_STARTALIGN 0x00040000 /* start field is alignment
> */
> +
> +#define IORESOURCE_MEM_64 0x00100000
> +
> + /* Userland may not map this resource */
> +#define IORESOURCE_EXCLUSIVE 0x08000000
> +#define IORESOURCE_DISABLED 0x10000000
> +#define IORESOURCE_UNSET 0x20000000
> +#define IORESOURCE_AUTO 0x40000000
> + /* Driver has marked this resource busy */
> +#define IORESOURCE_BUSY 0x80000000
> +
> +
> +typedef struct HostPCIIORegion {
> + unsigned long flags;
> + pcibus_t base_addr;
> + pcibus_t size;
> +} HostPCIIORegion;
> +
> +typedef struct HostPCIDevice {
> + uint16_t domain;
> + uint8_t bus;
> + uint8_t dev;
> + uint8_t func;
> +
> + uint16_t vendor_id;
> + uint16_t device_id;
> +
> + HostPCIIORegion io_regions[PCI_NUM_REGIONS - 1];
> + HostPCIIORegion rom;
> +
> + bool is_virtfn;
> +
> + int config_fd;
> +} HostPCIDevice;
> +
> +HostPCIDevice *host_pci_device_get(uint8_t bus, uint8_t dev, uint8_t func);
> +void host_pci_device_put(HostPCIDevice *pci_dev);
> +
> +int host_pci_get_byte(HostPCIDevice *d, int pos, uint8_t *p);
> +int host_pci_get_word(HostPCIDevice *d, int pos, uint16_t *p);
> +int host_pci_get_long(HostPCIDevice *d, int pos, uint32_t *p);
> +int host_pci_get_block(HostPCIDevice *d, int pos, uint8_t *buf, int len);
> +int host_pci_set_byte(HostPCIDevice *d, int pos, uint8_t data);
> +int host_pci_set_word(HostPCIDevice *d, int pos, uint16_t data);
> +int host_pci_set_long(HostPCIDevice *d, int pos, uint32_t data);
> +int host_pci_set_block(HostPCIDevice *d, int pos, uint8_t *buf, int len);
> +
> +uint32_t host_pci_find_ext_cap_offset(HostPCIDevice *s, uint32_t cap);
> +
> +#endif /* !HW_HOST_PCI_DEVICE */
> --
> Anthony PERARD
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