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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [xen staging] libxl: introduce libxl_pci_bdf_assignable_add/remove/list/list_free(), ...
commit 5ab684cb3e4d078f246e6fa2d8bc445959b6820e
Author: Paul Durrant <pdurrant@xxxxxxxxxx>
AuthorDate: Tue Dec 8 19:30:30 2020 +0000
Commit: Wei Liu <wl@xxxxxxx>
CommitDate: Tue Dec 15 16:24:26 2020 +0000
libxl: introduce libxl_pci_bdf_assignable_add/remove/list/list_free(), ...
which support naming and use 'libxl_pci_bdf' rather than 'libxl_device_pci',
as replacements for libxl_device_pci_assignable_add/remove/list/list_free().
libxl_pci_bdf_assignable_add() takes a 'name' parameter which is stored in
xenstore and facilitates two addtional functions added by this patch:
libxl_pci_bdf_assignable_name2bdf() and libxl_pci_bdf_assignable_bdf2name().
Currently there are no callers of these two functions. They will be added in
a subsequent patch.
libxl_device_pci_assignable_add/remove/list/list_free() are left in place
for compatibility but are re-implemented in terms of the newly introduced
functions.
Signed-off-by: Paul Durrant <pdurrant@xxxxxxxxxx>
Acked-by: Wei Liu <wl@xxxxxxx>
---
tools/include/libxl.h | 36 ++++++++--
tools/libs/light/libxl_pci.c | 166 ++++++++++++++++++++++++++++++++++++-------
2 files changed, 171 insertions(+), 31 deletions(-)
diff --git a/tools/include/libxl.h b/tools/include/libxl.h
index 1fa4c5806d..fda611f889 100644
--- a/tools/include/libxl.h
+++ b/tools/include/libxl.h
@@ -469,6 +469,13 @@
*/
#define LIBXL_HAVE_PCI_BDF 1
+/*
+ * LIBXL_HAVE_PCI_ASSIGNABLE_BDF indicates that the
+ * libxl_pci_bdf_assignable_add/remove/list/list_free() functions all
+ * exist.
+ */
+#define LIBXL_HAVE_PCI_ASSIGNABLE_BDF 1
+
/*
* libxl ABI compatibility
*
@@ -2357,9 +2364,9 @@ int libxl_device_events_handler(libxl_ctx *ctx,
LIBXL_EXTERNAL_CALLERS_ONLY;
/*
- * Functions related to making devices assignable -- that is, bound to
- * the pciback driver, ready to be given to a guest via
- * libxl_pci_device_add.
+ * Functions related to making PCI devices with the specified BDF
+ * assignable -- that is, bound to the pciback driver, ready to be given to
+ * a guest via libxl_pci_device_add.
*
* - ..._add() will unbind the device from its current driver (if
* already bound) and re-bind it to pciback; at that point it will be
@@ -2371,16 +2378,31 @@ int libxl_device_events_handler(libxl_ctx *ctx,
* rebind is non-zero, attempt to assign it back to the driver
* from whence it came.
*
- * - ..._list() will return a list of the PCI devices available to be
+ * - ..._list() will return a list of the PCI BDFs available to be
* assigned.
*
* add and remove are idempotent: if the device in question is already
* added or is not bound, the functions will emit a warning but return
* SUCCESS.
*/
-int libxl_device_pci_assignable_add(libxl_ctx *ctx, libxl_device_pci *pci, int
rebind);
-int libxl_device_pci_assignable_remove(libxl_ctx *ctx, libxl_device_pci *pci,
int rebind);
-libxl_device_pci *libxl_device_pci_assignable_list(libxl_ctx *ctx, int *num);
+int libxl_pci_bdf_assignable_add(libxl_ctx *ctx, libxl_pci_bdf *pcibdf,
+ const char *name, int rebind);
+int libxl_pci_bdf_assignable_remove(libxl_ctx *ctx, libxl_pci_bdf *pcibdf,
+ int rebind);
+libxl_pci_bdf *libxl_pci_bdf_assignable_list(libxl_ctx *ctx, int *num);
+void libxl_pci_bdf_assignable_list_free(libxl_pci_bdf *list, int num);
+libxl_pci_bdf *libxl_pci_bdf_assignable_name2bdf(libxl_ctx *ctx,
+ const char *name);
+char *libxl_pci_bdf_assignable_bdf2name(libxl_ctx *ctx,
+ libxl_pci_bdf *pcibdf);
+
+/* Compatibility functions - Use libxl_pci_bdf_assignable_* instead */
+int libxl_device_pci_assignable_add(libxl_ctx *ctx, libxl_device_pci *pci,
+ int rebind);
+int libxl_device_pci_assignable_remove(libxl_ctx *ctx, libxl_device_pci *pci,
+ int rebind);
+libxl_device_pci *libxl_device_pci_assignable_list(libxl_ctx *ctx,
+ int *num);
void libxl_device_pci_assignable_list_free(libxl_device_pci *list, int num);
/* CPUID handling */
diff --git a/tools/libs/light/libxl_pci.c b/tools/libs/light/libxl_pci.c
index 448fe96951..e11574e73f 100644
--- a/tools/libs/light/libxl_pci.c
+++ b/tools/libs/light/libxl_pci.c
@@ -426,10 +426,10 @@ static void pci_info_xs_remove(libxl__gc *gc,
libxl_pci_bdf *pcibdf,
xs_rm(ctx->xsh, XBT_NULL, path);
}
-libxl_device_pci *libxl_device_pci_assignable_list(libxl_ctx *ctx, int *num)
+libxl_pci_bdf *libxl_pci_bdf_assignable_list(libxl_ctx *ctx, int *num)
{
GC_INIT(ctx);
- libxl_device_pci *pcis = NULL, *new;
+ libxl_pci_bdf *pcibdfs = NULL, *new;
struct dirent *de;
DIR *dir;
@@ -450,17 +450,17 @@ libxl_device_pci
*libxl_device_pci_assignable_list(libxl_ctx *ctx, int *num)
if (sscanf(de->d_name, PCI_BDF, &dom, &bus, &dev, &func) != 4)
continue;
- new = realloc(pcis, ((*num) + 1) * sizeof(*new));
+ new = realloc(pcibdfs, ((*num) + 1) * sizeof(*new));
if (NULL == new)
continue;
- pcis = new;
- new = pcis + *num;
+ pcibdfs = new;
+ new = pcibdfs + *num;
- libxl_device_pci_init(new);
- pcibdf_struct_fill(&new->bdf, dom, bus, dev, func);
+ libxl_pci_bdf_init(new);
+ pcibdf_struct_fill(new, dom, bus, dev, func);
- if (pci_info_xs_read(gc, &new->bdf, "domid")) /* already assigned */
+ if (pci_info_xs_read(gc, new, "domid")) /* already assigned */
continue;
(*num)++;
@@ -469,15 +469,15 @@ libxl_device_pci
*libxl_device_pci_assignable_list(libxl_ctx *ctx, int *num)
closedir(dir);
out:
GC_FREE;
- return pcis;
+ return pcibdfs;
}
-void libxl_device_pci_assignable_list_free(libxl_device_pci *list, int num)
+void libxl_pci_bdf_assignable_list_free(libxl_pci_bdf *list, int num)
{
int i;
for (i = 0; i < num; i++)
- libxl_device_pci_dispose(&list[i]);
+ libxl_pci_bdf_dispose(&list[i]);
free(list);
}
@@ -745,6 +745,7 @@ static int pciback_dev_unassign(libxl__gc *gc,
libxl_pci_bdf *pcibdf)
static int libxl__pci_bdf_assignable_add(libxl__gc *gc,
libxl_pci_bdf *pcibdf,
+ const char *name,
int rebind)
{
libxl_ctx *ctx = libxl__gc_owner(gc);
@@ -753,6 +754,23 @@ static int libxl__pci_bdf_assignable_add(libxl__gc *gc,
int rc;
struct stat st;
+ /* Sanitise any name that was passed */
+ if (name) {
+ unsigned int i, n = strlen(name);
+
+ if (n > 64) { /* Reasonable upper bound on name length */
+ LOG(ERROR, "Name too long");
+ return ERROR_FAIL;
+ }
+
+ for (i = 0; i < n; i++) {
+ if (!isgraph(name[i])) {
+ LOG(ERROR, "Names may only include printable characters");
+ return ERROR_FAIL;
+ }
+ }
+ }
+
/* Local copy for convenience */
dom = pcibdf->domain;
bus = pcibdf->bus;
@@ -773,7 +791,7 @@ static int libxl__pci_bdf_assignable_add(libxl__gc *gc,
}
if ( rc ) {
LOG(WARN, PCI_BDF" already assigned to pciback", dom, bus, dev, func);
- goto quarantine;
+ goto name;
}
/* Check to see if there's already a driver that we need to unbind from */
@@ -804,7 +822,12 @@ static int libxl__pci_bdf_assignable_add(libxl__gc *gc,
return ERROR_FAIL;
}
-quarantine:
+name:
+ if (name)
+ pci_info_xs_write(gc, pcibdf, "name", name);
+ else
+ pci_info_xs_remove(gc, pcibdf, "name");
+
/*
* DOMID_IO is just a sentinel domain, without any actual mappings,
* so always pass XEN_DOMCTL_DEV_RDM_RELAXED to avoid assignment being
@@ -868,34 +891,87 @@ static int libxl__pci_bdf_assignable_remove(libxl__gc *gc,
}
}
+ pci_info_xs_remove(gc, pcibdf, "name");
+
return 0;
}
-int libxl_device_pci_assignable_add(libxl_ctx *ctx, libxl_device_pci *pci,
- int rebind)
+int libxl_pci_bdf_assignable_add(libxl_ctx *ctx, libxl_pci_bdf *pcibdf,
+ const char *name, int rebind)
{
GC_INIT(ctx);
int rc;
- rc = libxl__pci_bdf_assignable_add(gc, &pci->bdf, rebind);
+ rc = libxl__pci_bdf_assignable_add(gc, pcibdf, name, rebind);
GC_FREE;
return rc;
}
-int libxl_device_pci_assignable_remove(libxl_ctx *ctx, libxl_device_pci *pci,
- int rebind)
+int libxl_pci_bdf_assignable_remove(libxl_ctx *ctx, libxl_pci_bdf *pcibdf,
+ int rebind)
{
GC_INIT(ctx);
int rc;
- rc = libxl__pci_bdf_assignable_remove(gc, &pci->bdf, rebind);
+ rc = libxl__pci_bdf_assignable_remove(gc, pcibdf, rebind);
GC_FREE;
return rc;
}
+libxl_pci_bdf *libxl_pci_bdf_assignable_name2bdf(libxl_ctx *ctx,
+ const char *name)
+{
+ GC_INIT(ctx);
+ char **bdfs;
+ libxl_pci_bdf *pcibdf = NULL;
+ unsigned int i, n;
+
+ bdfs = libxl__xs_directory(gc, XBT_NULL, PCI_INFO_PATH, &n);
+ if (!n)
+ goto out;
+
+ pcibdf = calloc(1, sizeof(*pcibdf));
+ if (!pcibdf)
+ goto out;
+
+ for (i = 0; i < n; i++) {
+ unsigned dom, bus, dev, func;
+ const char *tmp;
+
+ if (sscanf(bdfs[i], PCI_BDF_XSPATH, &dom, &bus, &dev, &func) != 4)
+ continue;
+
+ pcibdf_struct_fill(pcibdf, dom, bus, dev, func);
+
+ tmp = pci_info_xs_read(gc, pcibdf, "name");
+ if (tmp && !strcmp(tmp, name))
+ goto out;
+ }
+
+ free(pcibdf);
+ pcibdf = NULL;
+
+out:
+ GC_FREE;
+ return pcibdf;
+}
+
+char *libxl_pci_bdf_assignable_bdf2name(libxl_ctx *ctx,
+ libxl_pci_bdf *pcibdf)
+{
+ GC_INIT(ctx);
+ char *name = NULL, *tmp = pci_info_xs_read(gc, pcibdf, "name");
+
+ if (tmp)
+ name = strdup(tmp);
+
+ GC_FREE;
+ return name;
+}
+
/*
* This function checks that all functions of a device are bound to pciback
* driver. It also initialises a bit-mask of which function numbers are present
@@ -1490,17 +1566,17 @@ int libxl_device_pci_add(libxl_ctx *ctx, uint32_t domid,
static bool is_bdf_assignable(libxl_ctx *ctx, libxl_pci_bdf *pcibdf)
{
- libxl_device_pci *pcis;
+ libxl_pci_bdf *pcibdfs;
int num, i;
- pcis = libxl_device_pci_assignable_list(ctx, &num);
+ pcibdfs = libxl_pci_bdf_assignable_list(ctx, &num);
for (i = 0; i < num; i++) {
- if (COMPARE_BDF(pcibdf, &pcis[i].bdf))
+ if (COMPARE_BDF(pcibdf, &pcibdfs[i]))
break;
}
- libxl_device_pci_assignable_list_free(pcis, num);
+ libxl_pci_bdf_assignable_list_free(pcibdfs, num);
return i < num;
}
@@ -1551,7 +1627,7 @@ void libxl__device_pci_add(libxl__egc *egc, uint32_t
domid,
if (rc) goto out;
if (pci->seize && !pciback_dev_is_assigned(gc, &pci->bdf)) {
- rc = libxl__pci_bdf_assignable_add(gc, &pci->bdf, 1);
+ rc = libxl__pci_bdf_assignable_add(gc, &pci->bdf, NULL, 1);
if ( rc )
goto out;
}
@@ -2449,6 +2525,48 @@ DEFINE_DEVICE_TYPE_STRUCT(pci, PCI, pcidevs,
.from_xenstore = libxl__device_pci_from_xs_be,
);
+int libxl_device_pci_assignable_add(libxl_ctx *ctx, libxl_device_pci *pci,
+ int rebind)
+{
+ return libxl_pci_bdf_assignable_add(ctx, &pci->bdf, NULL, rebind);
+}
+
+int libxl_device_pci_assignable_remove(libxl_ctx *ctx, libxl_device_pci *pci,
+ int rebind)
+{
+ return libxl_pci_bdf_assignable_remove(ctx, &pci->bdf, rebind);
+}
+
+libxl_device_pci *libxl_device_pci_assignable_list(libxl_ctx *ctx,
+ int *num)
+{
+ libxl_pci_bdf *pcibdfs = libxl_pci_bdf_assignable_list(ctx, num);
+ libxl_device_pci *pcis;
+ unsigned int i;
+
+ if (!pcibdfs)
+ return NULL;
+
+ pcis = calloc(*num, sizeof(*pcis));
+ if (!pcis) {
+ libxl_pci_bdf_assignable_list_free(pcibdfs, *num);
+ return NULL;
+ }
+
+ for (i = 0; i < *num; i++) {
+ libxl_device_pci_init(&pcis[i]);
+ libxl_pci_bdf_copy(ctx, &pcis[i].bdf, &pcibdfs[i]);
+ }
+
+ libxl_pci_bdf_assignable_list_free(pcibdfs, *num);
+ return pcis;
+}
+
+void libxl_device_pci_assignable_list_free(libxl_device_pci *list, int num)
+{
+ libxl_device_pci_list_free(list, num);
+}
+
/*
* Local variables:
* mode: C
--
generated by git-patchbot for /home/xen/git/xen.git#staging
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