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Subject[PATCH 7/9] PCI: Make pci bridge reallocating enabled/disabled
Date
Let the user could enable and disable with pci=realloc=on or pci=realloc=off

Also
1. move variable and functions near the place they are used.
2. change macro to function
3. change related functions and variable to static and _init
4. update parameter description accordingly.

-v2: still honor pci=realloc, and treat it as pci=realloc=on
also use enum instead of ...

Signed-off-by: Yinghai Lu <yinghai@kernel.org>
---
Documentation/kernel-parameters.txt | 8 ++++++--
drivers/pci/pci.c | 4 +++-
drivers/pci/pci.h | 2 +-
drivers/pci/setup-bus.c | 33 ++++++++++++++++++++++++++-------
4 files changed, 36 insertions(+), 11 deletions(-)

diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index 033d4e6..e11e5dd 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -2109,8 +2109,12 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
the default.
off: Turn ECRC off
on: Turn ECRC on.
- realloc reallocate PCI resources if allocations done by BIOS
- are erroneous.
+ realloc= Enable/disable reallocating PCI bridge resources
+ if allocations done by BIOS are too small to fit
+ resources required by children devices.
+ off: Turn realloc off
+ on: Turn realloc on
+ realloc same as realloc=on

pcie_aspm= [PCIE] Forcibly enable or disable PCIe Active State Power
Management.
diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index 9c89447..09cb1f2 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -3744,8 +3744,10 @@ static int __init pci_setup(char *str)
pci_no_msi();
} else if (!strcmp(str, "noaer")) {
pci_no_aer();
+ } else if (!strncmp(str, "realloc=", 8)) {
+ pci_realloc_get_opt(str + 8);
} else if (!strncmp(str, "realloc", 7)) {
- pci_realloc();
+ pci_realloc_get_opt("on");
} else if (!strcmp(str, "nodomains")) {
pci_no_domains();
} else if (!strncmp(str, "cbiosize=", 9)) {
diff --git a/drivers/pci/pci.h b/drivers/pci/pci.h
index aaf7ff8..f862a5a 100644
--- a/drivers/pci/pci.h
+++ b/drivers/pci/pci.h
@@ -148,7 +148,7 @@ static inline void pci_no_msi(void) { }
static inline void pci_msi_init_pci_dev(struct pci_dev *dev) { }
#endif

-extern void pci_realloc(void);
+void pci_realloc_get_opt(char *);

static inline int pci_no_d1d2(struct pci_dev *dev)
{
diff --git a/drivers/pci/setup-bus.c b/drivers/pci/setup-bus.c
index 162edfb..22454c5 100644
--- a/drivers/pci/setup-bus.c
+++ b/drivers/pci/setup-bus.c
@@ -48,13 +48,6 @@ static void free_list(struct list_head *head)
}
}

-int pci_realloc_enable = 0;
-#define pci_realloc_enabled() pci_realloc_enable
-void pci_realloc(void)
-{
- pci_realloc_enable = 1;
-}
-
/**
* add_to_list() - add a new resource tracker to the list
* @head: Head of the list
@@ -1273,6 +1266,32 @@ static int __init pci_get_max_depth(void)
return depth;
}

+/*
+ * -1: undefined, will auto detect later
+ * 0: disabled by user
+ * 1: enabled by user
+ * 2: enabled by auto detect
+ */
+enum enable_type {
+ enable_not_set = -1,
+ enable_no_user,
+ enable_no_detected,
+ enable_yes_user,
+ enable_yes_detected,
+};
+
+static enum enable_type pci_realloc_enable __initdata = enable_not_set;
+void __init pci_realloc_get_opt(char *str)
+{
+ if (!strncmp(str, "off", 3))
+ pci_realloc_enable = enable_no_user;
+ else if (!strncmp(str, "on", 2))
+ pci_realloc_enable = enable_yes_user;
+}
+static bool __init pci_realloc_enabled(void)
+{
+ return pci_realloc_enable >= enable_yes_user;
+}

/*
* first try will not touch pci bridge res
--
1.7.7


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