[v8][PATCH 16/16] tools: parse to enable new rdm policy parameters

[Tiejun Chen <tiejun.chen@intel.com>]

This patch parses to enable user configurable parameters to specify
RDM resource and according policies which are defined previously,

Global RDM parameter:
    rdm = "strategy=host,policy=strict/relaxed"
Per-device RDM parameter:
    pci = [ 'sbdf, rdm_policy=strict/relaxed' ]

Default per-device RDM policy is same as default global RDM policy as being
'relaxed'. And the per-device policy would override the global policy like
others.

CC: Ian Jackson <ian.jackson@eu.citrix.com>
CC: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
CC: Ian Campbell <ian.campbell@citrix.com>
CC: Wei Liu <wei.liu2@citrix.com>
Acked-by: Wei Liu <wei.liu2@citrix.com>
Signed-off-by: Tiejun Chen <tiejun.chen@intel.com>
---
v8:

* Clean some codes style issues.

v7:

* Just sync with the fallout of renaming parameters from patch #10.

v6:

* Just sync those renames introduced by patch #10.

v5:

* Need a rebase after we make all rdm variables specific to .hvm.
* Like other pci option, the per-device policy always follows
  the global policy by default.

v4:

* Separated from current patch #11 to parse/enable our rdm policy parameters
  since its make a lot sense and these stuffs are specific to xl/libxlu.

 tools/libxl/libxlu_pci.c | 92 +++++++++++++++++++++++++++++++++++++++++++++++-
 tools/libxl/libxlutil.h  |  4 +++
 tools/libxl/xl_cmdimpl.c | 13 +++++++
 3 files changed, 108 insertions(+), 1 deletion(-)

diff --git a/tools/libxl/libxlu_pci.c b/tools/libxl/libxlu_pci.c
index 26fb143..026413b 100644
--- a/tools/libxl/libxlu_pci.c
+++ b/tools/libxl/libxlu_pci.c
@@ -42,6 +42,9 @@ static int pcidev_struct_fill(libxl_device_pci *pcidev, unsigned int domain,
 #define STATE_OPTIONS_K 6
 #define STATE_OPTIONS_V 7
 #define STATE_TERMINAL  8
+#define STATE_TYPE      9
+#define STATE_RDM_STRATEGY      10
+#define STATE_RESERVE_POLICY    11
 int xlu_pci_parse_bdf(XLU_Config *cfg, libxl_device_pci *pcidev, const char *str)
 {
     unsigned state = STATE_DOMAIN;
@@ -143,7 +146,18 @@ int xlu_pci_parse_bdf(XLU_Config *cfg, libxl_device_pci *pcidev, const char *str
                     pcidev->permissive = atoi(tok);
                 }else if ( !strcmp(optkey, "seize") ) {
                     pcidev->seize = atoi(tok);
-                }else{
+                } else if (!strcmp(optkey, "rdm_policy")) {
+                    if (!strcmp(tok, "strict")) {
+                        pcidev->rdm_policy = LIBXL_RDM_RESERVE_POLICY_STRICT;
+                    } else if (!strcmp(tok, "relaxed")) {
+                        pcidev->rdm_policy = LIBXL_RDM_RESERVE_POLICY_RELAXED;
+                    } else {
+                        XLU__PCI_ERR(cfg, "%s is not an valid PCI RDM property"
+                                          " policy: 'strict' or 'relaxed'.",
+                                     tok);
+                        goto parse_error;
+                    }
+                } else {
                     XLU__PCI_ERR(cfg, "Unknown PCI BDF option: %s", optkey);
                 }
                 tok = ptr + 1;
@@ -167,6 +181,82 @@ parse_error:
     return ERROR_INVAL;
 }
 
+int xlu_rdm_parse(XLU_Config *cfg, libxl_rdm_reserve *rdm, const char *str)
+{
+    unsigned state = STATE_TYPE;
+    char *buf2, *tok, *ptr, *end;
+
+    if (NULL == (buf2 = ptr = strdup(str)))
+        return ERROR_NOMEM;
+
+    for (tok = ptr, end = ptr + strlen(ptr) + 1; ptr < end; ptr++) {
+        switch(state) {
+        case STATE_TYPE:
+            if (*ptr == '=') {
+                state = STATE_RDM_STRATEGY;
+                *ptr = '\0';
+                if (strcmp(tok, "strategy")) {
+                    XLU__PCI_ERR(cfg, "Unknown RDM state option: %s", tok);
+                    goto parse_error;
+                }
+                tok = ptr + 1;
+            }
+            break;
+        case STATE_RDM_STRATEGY:
+            if (*ptr == '\0' || *ptr == ',') {
+                state = STATE_RESERVE_POLICY;
+                *ptr = '\0';
+                if (!strcmp(tok, "host")) {
+                    rdm->strategy = LIBXL_RDM_RESERVE_STRATEGY_HOST;
+                } else {
+                    XLU__PCI_ERR(cfg, "Unknown RDM strategy option: %s", tok);
+                    goto parse_error;
+                }
+                tok = ptr + 1;
+            }
+            break;
+        case STATE_RESERVE_POLICY:
+            if (*ptr == '=') {
+                state = STATE_OPTIONS_V;
+                *ptr = '\0';
+                if (strcmp(tok, "policy")) {
+                    XLU__PCI_ERR(cfg, "Unknown RDM property value: %s", tok);
+                    goto parse_error;
+                }
+                tok = ptr + 1;
+            }
+            break;
+        case STATE_OPTIONS_V:
+            if (*ptr == ',' || *ptr == '\0') {
+                state = STATE_TERMINAL;
+                *ptr = '\0';
+                if (!strcmp(tok, "strict")) {
+                    rdm->policy = LIBXL_RDM_RESERVE_POLICY_STRICT;
+                } else if (!strcmp(tok, "relaxed")) {
+                    rdm->policy = LIBXL_RDM_RESERVE_POLICY_RELAXED;
+                } else {
+                    XLU__PCI_ERR(cfg, "Unknown RDM property policy value: %s",
+                                 tok);
+                    goto parse_error;
+                }
+                tok = ptr + 1;
+            }
+        default:
+            break;
+        }
+    }
+
+    free(buf2);
+
+    if (tok != ptr || state != STATE_TERMINAL)
+        goto parse_error;
+
+    return 0;
+
+parse_error:
+    return ERROR_INVAL;
+}
+
 /*
  * Local variables:
  * mode: C
diff --git a/tools/libxl/libxlutil.h b/tools/libxl/libxlutil.h
index 989605a..e81b644 100644
--- a/tools/libxl/libxlutil.h
+++ b/tools/libxl/libxlutil.h
@@ -106,6 +106,10 @@ int xlu_disk_parse(XLU_Config *cfg, int nspecs, const char *const *specs,
  */
 int xlu_pci_parse_bdf(XLU_Config *cfg, libxl_device_pci *pcidev, const char *str);
 
+/*
+ * RDM parsing
+ */
+int xlu_rdm_parse(XLU_Config *cfg, libxl_rdm_reserve *rdm, const char *str);
 
 /*
  * Vif rate parsing.
diff --git a/tools/libxl/xl_cmdimpl.c b/tools/libxl/xl_cmdimpl.c
index dfb50d6..38d6c53 100644
--- a/tools/libxl/xl_cmdimpl.c
+++ b/tools/libxl/xl_cmdimpl.c
@@ -1923,6 +1923,14 @@ skip_vfb:
         xlu_cfg_get_defbool(config, "e820_host", &b_info->u.pv.e820_host, 0);
     }
 
+    if (!xlu_cfg_get_string(config, "rdm", &buf, 0)) {
+        libxl_rdm_reserve rdm;
+        if (!xlu_rdm_parse(config, &rdm, buf)) {
+            b_info->u.hvm.rdm.strategy = rdm.strategy;
+            b_info->u.hvm.rdm.policy = rdm.policy;
+        }
+    }
+
     if (!xlu_cfg_get_list (config, "pci", &pcis, 0, 0)) {
         d_config->num_pcidevs = 0;
         d_config->pcidevs = NULL;
@@ -1937,6 +1945,11 @@ skip_vfb:
             pcidev->power_mgmt = pci_power_mgmt;
             pcidev->permissive = pci_permissive;
             pcidev->seize = pci_seize;
+            /*
+             * Like other pci option, the per-device policy always follows
+             * the global policy by default.
+             */
+            pcidev->rdm_policy = b_info->u.hvm.rdm.policy;
             if (!xlu_pci_parse_bdf(config, pcidev, buf))
                 d_config->num_pcidevs++;
         }
-- 
1.9.1