From patchwork Tue Oct 4 14:51:12 2011 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Anthony PERARD X-Patchwork-Id: 117635 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Received: from lists.gnu.org (lists.gnu.org [140.186.70.17]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (Client did not present a certificate) by ozlabs.org (Postfix) with ESMTPS id BD5C9B6F6F for ; Wed, 5 Oct 2011 01:52:00 +1100 (EST) Received: from localhost ([::1]:44686 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1RB6Ld-0007sc-6j for incoming@patchwork.ozlabs.org; Tue, 04 Oct 2011 10:51:57 -0400 Received: from eggs.gnu.org ([140.186.70.92]:41056) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1RB6LM-0007eR-Au for qemu-devel@nongnu.org; Tue, 04 Oct 2011 10:51:45 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1RB6LH-0003nK-5H for qemu-devel@nongnu.org; Tue, 04 Oct 2011 10:51:40 -0400 Received: from smtp.citrix.com ([66.165.176.89]:14140) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1RB6LG-0003mp-Rt for qemu-devel@nongnu.org; Tue, 04 Oct 2011 10:51:35 -0400 X-IronPort-AV: E=Sophos;i="4.68,485,1312171200"; d="scan'208";a="17928378" Received: from ftlpmailmx02.citrite.net ([10.13.107.66]) by FTLPIPO01.CITRIX.COM with ESMTP/TLS/RC4-MD5; 04 Oct 2011 10:51:33 -0400 Received: from smtp01.ad.xensource.com (10.219.128.104) by smtprelay.citrix.com (10.13.107.66) with Microsoft SMTP Server id 8.3.137.0; Tue, 4 Oct 2011 10:51:33 -0400 Received: from perard.uk.xensource.com (dhcp-3-28.uk.xensource.com [10.80.3.28] (may be forged)) by smtp01.ad.xensource.com (8.13.1/8.13.1) with ESMTP id p94EpSs2017018; Tue, 4 Oct 2011 07:51:31 -0700 From: Anthony PERARD To: QEMU-devel Date: Tue, 4 Oct 2011 15:51:12 +0100 Message-ID: <1317739882-4809-2-git-send-email-anthony.perard@citrix.com> X-Mailer: git-send-email 1.7.2.5 In-Reply-To: <1317739882-4809-1-git-send-email-anthony.perard@citrix.com> References: <1317739882-4809-1-git-send-email-anthony.perard@citrix.com> MIME-Version: 1.0 X-detected-operating-system: by eggs.gnu.org: Genre and OS details not recognized. X-Received-From: 66.165.176.89 Cc: Anthony PERARD , Alex Williamson , Xen Devel , Stefano Stabellini Subject: [Qemu-devel] [PATCH RFC V1 01/11] Introduce HostPCIDevice to access a pci device on the host. X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Signed-off-by: Anthony PERARD --- hw/host-pci-device.c | 192 ++++++++++++++++++++++++++++++++++++++++++++++++++ hw/host-pci-device.h | 36 +++++++++ 2 files changed, 228 insertions(+), 0 deletions(-) create mode 100644 hw/host-pci-device.c create mode 100644 hw/host-pci-device.h diff --git a/hw/host-pci-device.c b/hw/host-pci-device.c new file mode 100644 index 0000000..b3f2899 --- /dev/null +++ b/hw/host-pci-device.c @@ -0,0 +1,192 @@ +#include "qemu-common.h" +#include "host-pci-device.h" + +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; + 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 -1; + } + + 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); + break; + } + if (start) { + size = end - start + 1; + } else { + size = 0; + } + + flags &= 0xf; + + if (i < PCI_ROM_SLOT) { + d->base_addr[i] = start | flags; + d->size[i] = size; + } else { + d->rom_base_addr = start | flags; + d->rom_size = size; + } + } + + fclose(f); + return 0; +} + +static unsigned long get_value(HostPCIDevice *d, const char *name) +{ + 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 -1; + } + if (fscanf(f, "%lx\n", &value) != 1) { + fprintf(stderr, "Error: Syntax error in %s\n", path); + value = -1; + } + fclose(f); + return value; +} + +static int pci_dev_is_virtfn(HostPCIDevice *d) +{ + int rc; + char path[PATH_MAX]; + struct stat buf; + + path_to(d, "physfn", path, sizeof (path)); + rc = !stat(path, &buf); + + return rc; +} + +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; + + res = pread(fd, buf, len, pos); + if (res < 0) { + fprintf(stderr, "host_pci_config: read failed: %s (fd: %i)\n", + strerror(errno), fd); + return -1; + } + return res; +} +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; + + res = pwrite(fd, buf, len, pos); + if (res < 0) { + fprintf(stderr, "host_pci_config: write failed: %s\n", + strerror(errno)); + return -1; + } + return res; +} + +uint8_t host_pci_read_byte(HostPCIDevice *d, int pos) +{ + uint8_t buf; + host_pci_config_read(d, pos, &buf, 1); + return buf; +} +uint16_t host_pci_read_word(HostPCIDevice *d, int pos) +{ + uint16_t buf; + host_pci_config_read(d, pos, &buf, 2); + return le16_to_cpu(buf); +} +uint32_t host_pci_read_long(HostPCIDevice *d, int pos) +{ + uint32_t buf; + host_pci_config_read(d, pos, &buf, 4); + return le32_to_cpu(buf); +} +int host_pci_read_block(HostPCIDevice *d, int pos, uint8_t *buf, int len) +{ + return host_pci_config_read(d, pos, buf, len); +} + +int host_pci_write_byte(HostPCIDevice *d, int pos, uint8_t data) +{ + return host_pci_config_write(d, pos, &data, 1); +} +int host_pci_write_word(HostPCIDevice *d, int pos, uint16_t data) +{ + return host_pci_config_write(d, pos, &data, 2); +} +int host_pci_write_long(HostPCIDevice *d, int pos, uint32_t data) +{ + return host_pci_config_write(d, pos, &data, 4); +} +int host_pci_write_block(HostPCIDevice *d, int pos, uint8_t *buf, int len) +{ + return host_pci_config_write(d, pos, buf, len); +} + +HostPCIDevice *host_pci_device_get(uint8_t bus, uint8_t dev, uint8_t func) +{ + HostPCIDevice *d = NULL; + + 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) == -1) + goto error; + + d->vendor_id = get_value(d, "vendor"); + d->device_id = get_value(d, "device"); + 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; +} diff --git a/hw/host-pci-device.h b/hw/host-pci-device.h new file mode 100644 index 0000000..0137507 --- /dev/null +++ b/hw/host-pci-device.h @@ -0,0 +1,36 @@ +#ifndef HW_HOST_PCI_DEVICE +# define HW_HOST_PCI_DEVICE + +#include "pci.h" + +typedef struct HostPCIDevice { + uint16_t domain; + uint8_t bus; + uint8_t dev; + uint8_t func; + + uint16_t vendor_id; + uint16_t device_id; + + pcibus_t base_addr[PCI_NUM_REGIONS - 1]; + pcibus_t size[PCI_NUM_REGIONS - 1]; + pcibus_t rom_base_addr; + pcibus_t rom_size; + + bool is_virtfn; + + int config_fd; +} HostPCIDevice; + +HostPCIDevice *host_pci_device_get(uint8_t bus, uint8_t dev, uint8_t func); + +uint8_t host_pci_read_byte(HostPCIDevice *d, int pos); +uint16_t host_pci_read_word(HostPCIDevice *d, int pos); +uint32_t host_pci_read_long(HostPCIDevice *d, int pos); +int host_pci_read_block(HostPCIDevice *d, int pos, uint8_t *buf, int len); +int host_pci_write_byte(HostPCIDevice *d, int pos, uint8_t data); +int host_pci_write_word(HostPCIDevice *d, int pos, uint16_t data); +int host_pci_write_long(HostPCIDevice *d, int pos, uint32_t data); +int host_pci_write_block(HostPCIDevice *d, int pos, uint8_t *buf, int len); + +#endif /* !HW_HOST_PCI_DEVICE */