From: "Saheed O. Bolarinwa" <refactormyself@gmail.com>
To: helgaas@kernel.org
Cc: "Saheed O. Bolarinwa" <refactormyself@gmail.com>,
linux-kernel-mentees@lists.linuxfoundation.org
Subject: [Linux-kernel-mentees] [RFC PATCH v5 14/23] PCI: Change Return and Argument values from pcie_link_state to pci_dev
Date: Sat, 22 Aug 2020 22:03:49 +0200 [thread overview]
Message-ID: <20200822200358.252967-15-refactormyself@gmail.com> (raw)
In-Reply-To: <20200822200358.252967-1-refactormyself@gmail.com>
- Change Return and Argument values from pcie_link_state to pci_dev
- Refactor callers accordingly
Signed-off-by: Saheed O. Bolarinwa <refactormyself@gmail.com>
---
drivers/pci/pcie/aspm.c | 145 +++++++++++++++++++++-------------------
1 file changed, 76 insertions(+), 69 deletions(-)
diff --git a/drivers/pci/pcie/aspm.c b/drivers/pci/pcie/aspm.c
index e869e7faaac5..6f73eb2ca0bd 100644
--- a/drivers/pci/pcie/aspm.c
+++ b/drivers/pci/pcie/aspm.c
@@ -101,7 +101,7 @@ static const char *policy_str[] = {
#define LINK_RETRAIN_TIMEOUT HZ
-static int policy_to_aspm_state(struct pcie_link_state *link)
+static int policy_to_aspm_state(struct pci_dev *pdev)
{
switch (aspm_policy) {
case POLICY_PERFORMANCE:
@@ -114,12 +114,12 @@ static int policy_to_aspm_state(struct pcie_link_state *link)
/* Enable Everything */
return ASPM_STATE_ALL;
case POLICY_DEFAULT:
- return link->aspm_default;
+ return pdev->link_state->aspm_default;
}
return 0;
}
-static int policy_to_clkpm_state(struct pcie_link_state *link)
+static int policy_to_clkpm_state(struct pci_dev *pdev)
{
switch (aspm_policy) {
case POLICY_PERFORMANCE:
@@ -130,13 +130,14 @@ static int policy_to_clkpm_state(struct pcie_link_state *link)
/* Enable Clock PM */
return 1;
case POLICY_DEFAULT:
- return link->clkpm_default;
+ return pdev->link_state->clkpm_default;
}
return 0;
}
-static void pcie_set_clkpm_nocheck(struct pcie_link_state *link, int enable)
+static void pcie_set_clkpm_nocheck(struct pci_dev *pdev, int enable)
{
+ struct pcie_link_state *link = pdev->link_state;
struct pci_dev *child;
struct pci_bus *linkbus = link->pdev->subordinate;
u32 val = enable ? PCI_EXP_LNKCTL_CLKREQ_EN : 0;
@@ -149,8 +150,9 @@ static void pcie_set_clkpm_nocheck(struct pcie_link_state *link, int enable)
link->pdev->clkpm_enabled = !!enable;
}
-static void pcie_set_clkpm(struct pcie_link_state *link, int enable)
+static void pcie_set_clkpm(struct pci_dev *pdev, int enable)
{
+ struct pcie_link_state *link = pdev->link_state;
/*
* Don't enable Clock PM if the link is not Clock PM capable
* or Clock PM is disabled
@@ -160,11 +162,12 @@ static void pcie_set_clkpm(struct pcie_link_state *link, int enable)
/* Need nothing if the specified equals to current state */
if (link->clkpm_enabled == enable)
return;
- pcie_set_clkpm_nocheck(link, enable);
+ pcie_set_clkpm_nocheck(link->pdev, enable);
}
-static void pcie_clkpm_cap_init(struct pcie_link_state *link, int blacklist)
+static void pcie_clkpm_cap_init(struct pci_dev *pdev, int blacklist)
{
+ struct pcie_link_state *link = pdev->link_state;
int capable = 1, enabled = 1;
u16 reg16;
struct pci_dev *child;
@@ -191,9 +194,8 @@ static void pcie_clkpm_cap_init(struct pcie_link_state *link, int blacklist)
link->pdev->clkpm_disable = blacklist ? 1 : 0;
}
-static bool pcie_retrain_link(struct pcie_link_state *link)
+static bool pcie_retrain_link(struct pci_dev *parent)
{
- struct pci_dev *parent = link->pdev;
unsigned long end_jiffies;
u16 reg16;
@@ -226,11 +228,11 @@ static bool pcie_retrain_link(struct pcie_link_state *link)
* could use common clock. If they are, configure them to use the
* common clock. That will reduce the ASPM state exit latency.
*/
-static void pcie_aspm_configure_common_clock(struct pcie_link_state *link)
+static void pcie_aspm_configure_common_clock(struct pci_dev *parent)
{
int same_clock = 1;
u16 reg16, parent_reg, child_reg[8];
- struct pci_dev *child, *parent = link->pdev;
+ struct pci_dev *child;
struct pci_bus *linkbus = parent->subordinate;
/*
* All functions of a slot should have the same Slot Clock
@@ -287,7 +289,7 @@ static void pcie_aspm_configure_common_clock(struct pcie_link_state *link)
reg16 &= ~PCI_EXP_LNKCTL_CCC;
pcie_capability_write_word(parent, PCI_EXP_LNKCTL, reg16);
- if (pcie_retrain_link(link))
+ if (pcie_retrain_link(parent))
return;
/* Training failed. Restore common clock configurations */
@@ -503,8 +505,9 @@ static u32 get_aspm_enable(struct pci_dev *pdev)
return (reg16 & PCI_EXP_LNKCTL_ASPMC);
}
-static void pcie_aspm_cap_init(struct pcie_link_state *link, int blacklist)
+static void pcie_aspm_cap_init(struct pci_dev *pdev, int blacklist)
{
+ struct pcie_link_state *link = pdev->link_state;
struct pci_dev *child = link->downstream, *parent = link->pdev;
struct pci_bus *linkbus = parent->subordinate;
u32 up_l1ss_ctl1, dw_l1ss_ctl1;
@@ -527,7 +530,7 @@ static void pcie_aspm_cap_init(struct pcie_link_state *link, int blacklist)
return;
/* Configure common clock before checking latencies */
- pcie_aspm_configure_common_clock(link);
+ pcie_aspm_configure_common_clock(parent);
pci_read_config_dword(parent, parent->l1ss_cap_ptr + PCI_L1SS_CTL1,
&up_l1ss_ctl1);
@@ -659,8 +662,9 @@ static void pci_clear_and_set_dword(struct pci_dev *pdev, int pos,
}
/* Configure the ASPM L1 substates */
-static void pcie_config_aspm_l1ss(struct pcie_link_state *link, u32 state)
+static void pcie_config_aspm_l1ss(struct pci_dev *pdev, u32 state)
{
+ struct pcie_link_state *link = pdev->link_state;
u32 val, enable_req, ctl1, ctl2;
struct pci_dev *child = link->downstream, *parent = link->pdev;
int up_cap_ptr = parent->l1ss_cap_ptr;
@@ -742,8 +746,9 @@ static void pcie_config_aspm_dev(struct pci_dev *pdev, u32 val)
PCI_EXP_LNKCTL_ASPMC, val);
}
-static void pcie_config_aspm_link(struct pcie_link_state *link, u32 state)
+static void pcie_config_aspm_link(struct pci_dev *pdev, u32 state)
{
+ struct pcie_link_state *link = pdev->link_state;
u32 upstream = 0, dwstream = 0;
struct pci_dev *child = link->downstream, *parent = link->pdev;
struct pci_bus *linkbus = parent->subordinate;
@@ -775,7 +780,7 @@ static void pcie_config_aspm_link(struct pcie_link_state *link, u32 state)
}
if (link->aspm_capable & ASPM_STATE_L1SS)
- pcie_config_aspm_l1ss(link, state);
+ pcie_config_aspm_l1ss(parent, state);
/*
* Spec 2.0 suggests all functions should be configured the
@@ -794,18 +799,18 @@ static void pcie_config_aspm_link(struct pcie_link_state *link, u32 state)
parent->aspm_enabled = state;
}
-static void pcie_config_aspm_path(struct pcie_link_state *link)
+static void pcie_config_aspm_path(struct pci_dev *pdev)
{
- while (link) {
- pcie_config_aspm_link(link, policy_to_aspm_state(link));
- link = link->parent;
+ while (pdev) {
+ pcie_config_aspm_link(pdev, policy_to_aspm_state(pdev));
+ pdev = pdev->parent;
}
}
-static void free_link_state(struct pcie_link_state *link)
+static void free_link_state(struct pci_dev *pdev)
{
- link->pdev->link_state = NULL;
- kfree(link);
+ pdev->link_state = NULL;
+ kfree(pdev->link_state);
}
static int pcie_aspm_sanity_check(struct pci_dev *pdev)
@@ -843,13 +848,13 @@ static int pcie_aspm_sanity_check(struct pci_dev *pdev)
return 0;
}
-static struct pcie_link_state *alloc_pcie_link_state(struct pci_dev *pdev)
+static int alloc_pcie_link_state(struct pci_dev *pdev)
{
struct pcie_link_state *link;
link = kzalloc(sizeof(*link), GFP_KERNEL);
if (!link)
- return NULL;
+ return -1;
INIT_LIST_HEAD(&link->sibling);
INIT_LIST_HEAD(&pdev->sibling);
@@ -875,7 +880,7 @@ static struct pcie_link_state *alloc_pcie_link_state(struct pci_dev *pdev)
parent = pdev->bus->parent->self->link_state;
if (!parent) {
kfree(link);
- return NULL;
+ return -1;
}
link->parent = parent;
@@ -887,7 +892,7 @@ static struct pcie_link_state *alloc_pcie_link_state(struct pci_dev *pdev)
list_add(&link->sibling, &link_list);
list_add(&pdev->sibling, &pdev_link_list);
pdev->link_state = link;
- return link;
+ return 0;
}
static void pcie_aspm_update_sysfs_visibility(struct pci_dev *pdev)
@@ -932,18 +937,20 @@ void pcie_aspm_init_link_state(struct pci_dev *pdev)
goto out;
mutex_lock(&aspm_lock);
- link = alloc_pcie_link_state(pdev);
- if (!link)
+ if (!(alloc_pcie_link_state(pdev)))
goto unlock;
+
+ link = pdev->link_state;
+
/*
* Setup initial ASPM state. Note that we need to configure
* upstream links also because capable state of them can be
* update through pcie_aspm_cap_init().
*/
- pcie_aspm_cap_init(link, blacklist);
+ pcie_aspm_cap_init(link->pdev, blacklist);
/* Setup initial Clock PM state */
- pcie_clkpm_cap_init(link, blacklist);
+ pcie_clkpm_cap_init(link->pdev, blacklist);
/*
* At this stage drivers haven't had an opportunity to change the
@@ -955,8 +962,8 @@ void pcie_aspm_init_link_state(struct pci_dev *pdev)
*/
if (aspm_policy != POLICY_POWERSAVE &&
aspm_policy != POLICY_POWER_SUPERSAVE) {
- pcie_config_aspm_path(link);
- pcie_set_clkpm(link, policy_to_clkpm_state(link));
+ pcie_config_aspm_path(link->pdev);
+ pcie_set_clkpm(link->pdev, policy_to_clkpm_state(link->pdev));
}
pcie_aspm_update_sysfs_visibility(pdev);
@@ -968,8 +975,9 @@ void pcie_aspm_init_link_state(struct pci_dev *pdev)
}
/* Recheck latencies and update aspm_capable for links under the root */
-static void pcie_update_aspm_capable(struct pcie_link_state *root)
+static void pcie_update_aspm_capable(struct pci_dev *root_pdev)
{
+ struct pcie_link_state *root = root_pdev->link_state;
struct pcie_link_state *link;
BUG_ON(root->parent);
list_for_each_entry(link, &link_list, sibling) {
@@ -1015,15 +1023,15 @@ void pcie_aspm_exit_link_state(struct pci_dev *pdev)
parent_link = link->parent;
/* All functions are removed, so just disable ASPM for the link */
- pcie_config_aspm_link(link, 0);
+ pcie_config_aspm_link(parent, 0);
list_del(&link->sibling);
/* Clock PM is for endpoint device */
- free_link_state(link);
+ free_link_state(parent);
/* Recheck latencies and configure upstream links */
if (parent_link) {
- pcie_update_aspm_capable(root);
- pcie_config_aspm_path(parent_link);
+ pcie_update_aspm_capable(root->pdev);
+ pcie_config_aspm_path(parent_link->pdev);
}
out:
mutex_unlock(&aspm_lock);
@@ -1043,8 +1051,8 @@ void pcie_aspm_pm_state_change(struct pci_dev *pdev)
*/
down_read(&pci_bus_sem);
mutex_lock(&aspm_lock);
- pcie_update_aspm_capable(link->root);
- pcie_config_aspm_path(link);
+ pcie_update_aspm_capable(link->root->pdev);
+ pcie_config_aspm_path(pdev);
mutex_unlock(&aspm_lock);
up_read(&pci_bus_sem);
}
@@ -1062,13 +1070,13 @@ void pcie_aspm_powersave_config_link(struct pci_dev *pdev)
down_read(&pci_bus_sem);
mutex_lock(&aspm_lock);
- pcie_config_aspm_path(link);
- pcie_set_clkpm(link, policy_to_clkpm_state(link));
+ pcie_config_aspm_path(pdev);
+ pcie_set_clkpm(pdev, policy_to_clkpm_state(pdev));
mutex_unlock(&aspm_lock);
up_read(&pci_bus_sem);
}
-static struct pcie_link_state *pcie_aspm_get_link(struct pci_dev *pdev)
+static struct pci_dev *pcie_aspm_get_link(struct pci_dev *pdev)
{
struct pci_dev *bridge;
@@ -1079,13 +1087,13 @@ static struct pcie_link_state *pcie_aspm_get_link(struct pci_dev *pdev)
if (!bridge || !pci_is_pcie(bridge))
return NULL;
- return bridge->link_state;
+ return bridge;
}
static int __pci_disable_link_state(struct pci_dev *pdev, int state, bool sem)
{
- struct pcie_link_state *link = pcie_aspm_get_link(pdev);
- struct pci_dev *bridge = link->pdev;
+ struct pci_dev *bridge = pcie_aspm_get_link(pdev);
+ struct pcie_link_state *link = bridge->link_state;
if (!link)
return -EINVAL;
@@ -1130,13 +1138,13 @@ static int __pci_disable_link_state(struct pci_dev *pdev, int state, bool sem)
link->aspm_disable |= ASPM_STATE_L1_2_PCIPM;
bridge->aspm_disable |= ASPM_STATE_L1_2_PCIPM;
}
- pcie_config_aspm_link(link, policy_to_aspm_state(link));
+ pcie_config_aspm_link(link->pdev, policy_to_aspm_state(link->pdev));
if (state & PCIE_LINK_STATE_CLKPM) {
link->clkpm_disable = 1;
bridge->clkpm_disable = 1;
}
- pcie_set_clkpm(link, policy_to_clkpm_state(link));
+ pcie_set_clkpm(link->pdev, policy_to_clkpm_state(link->pdev));
mutex_unlock(&aspm_lock);
if (sem)
up_read(&pci_bus_sem);
@@ -1183,8 +1191,8 @@ static int pcie_aspm_set_policy(const char *val,
mutex_lock(&aspm_lock);
aspm_policy = i;
list_for_each_entry(link, &link_list, sibling) {
- pcie_config_aspm_link(link, policy_to_aspm_state(link));
- pcie_set_clkpm(link, policy_to_clkpm_state(link));
+ pcie_config_aspm_link(link->pdev, policy_to_aspm_state(link->pdev));
+ pcie_set_clkpm(link->pdev, policy_to_clkpm_state(link->pdev));
}
mutex_unlock(&aspm_lock);
up_read(&pci_bus_sem);
@@ -1216,12 +1224,12 @@ module_param_call(policy, pcie_aspm_set_policy, pcie_aspm_get_policy,
*/
bool pcie_aspm_enabled(struct pci_dev *pdev)
{
- struct pcie_link_state *link = pcie_aspm_get_link(pdev);
+ struct pci_dev *dev = pcie_aspm_get_link(pdev);
- if (!link)
+ if (!dev)
return false;
- return link->aspm_enabled;
+ return dev->link_state->aspm_enabled;
}
EXPORT_SYMBOL_GPL(pcie_aspm_enabled);
@@ -1229,10 +1237,10 @@ static ssize_t aspm_attr_show_common(struct device *dev,
struct device_attribute *attr,
char *buf, u8 state)
{
- struct pci_dev *pdev = to_pci_dev(dev);
- struct pcie_link_state *link = pcie_aspm_get_link(pdev);
+ struct pci_dev *pdev = pcie_aspm_get_link(to_pci_dev(dev));
- return sprintf(buf, "%d\n", (link->aspm_enabled & state) ? 1 : 0);
+ return sprintf(buf, "%d\n",
+ (pdev->link_state->aspm_enabled & state) ? 1 : 0);
}
static ssize_t aspm_attr_store_common(struct device *dev,
@@ -1240,8 +1248,8 @@ static ssize_t aspm_attr_store_common(struct device *dev,
const char *buf, size_t len, u8 state)
{
struct pci_dev *pdev = to_pci_dev(dev);
- struct pcie_link_state *link = pcie_aspm_get_link(pdev);
- struct pci_dev *bridge = link->pdev;
+ struct pci_dev *bridge = pcie_aspm_get_link(pdev);
+ struct pcie_link_state *link = bridge->link_state;
bool state_enable;
if (strtobool(buf, &state_enable) < 0)
@@ -1263,7 +1271,7 @@ static ssize_t aspm_attr_store_common(struct device *dev,
bridge->aspm_disable |= state;
}
- pcie_config_aspm_link(link, policy_to_aspm_state(link));
+ pcie_config_aspm_link(link->pdev, policy_to_aspm_state(link->pdev));
mutex_unlock(&aspm_lock);
up_read(&pci_bus_sem);
@@ -1291,18 +1299,17 @@ ASPM_ATTR(l1_2_pcipm, L1_2_PCIPM)
static ssize_t clkpm_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
- struct pci_dev *pdev = to_pci_dev(dev);
- struct pcie_link_state *link = pcie_aspm_get_link(pdev);
+ struct pci_dev *pdev = pcie_aspm_get_link(to_pci_dev(dev));
- return sprintf(buf, "%d\n", link->clkpm_enabled);
+ return sprintf(buf, "%d\n", pdev->link_state->clkpm_enabled);
}
static ssize_t clkpm_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t len)
{
- struct pci_dev *pdev = to_pci_dev(dev);
- struct pcie_link_state *link = pcie_aspm_get_link(pdev);
+ struct pci_dev *pdev = pcie_aspm_get_link(to_pci_dev(dev));
+ struct pcie_link_state *link = pdev->link_state;
bool state_enable;
if (strtobool(buf, &state_enable) < 0)
@@ -1313,7 +1320,7 @@ static ssize_t clkpm_store(struct device *dev,
link->clkpm_disable = !state_enable;
link->pdev->clkpm_disable = !state_enable;
- pcie_set_clkpm(link, policy_to_clkpm_state(link));
+ pcie_set_clkpm(link->pdev, policy_to_clkpm_state(link->pdev));
mutex_unlock(&aspm_lock);
up_read(&pci_bus_sem);
@@ -1344,8 +1351,8 @@ static umode_t aspm_ctrl_attrs_are_visible(struct kobject *kobj,
struct attribute *a, int n)
{
struct device *dev = kobj_to_dev(kobj);
- struct pci_dev *pdev = to_pci_dev(dev);
- struct pcie_link_state *link = pcie_aspm_get_link(pdev);
+ struct pci_dev *pdev = pcie_aspm_get_link(to_pci_dev(dev));
+ struct pcie_link_state *link = pdev->link_state;
static const u8 aspm_state_map[] = {
ASPM_STATE_L0S,
ASPM_STATE_L1,
--
2.18.4
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next prev parent reply other threads:[~2020-08-22 21:04 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-08-22 20:03 [Linux-kernel-mentees] [RFC PATCH v5 00/23] Remove struct pcie_link_state and aspm_register_info Saheed O. Bolarinwa
2020-08-22 20:03 ` [Linux-kernel-mentees] [RFC PATCH v5 01/23] PCI: Migrate ASPM info from struct pcie_link_state to struct pci_dev Saheed O. Bolarinwa
2020-08-22 20:03 ` [Linux-kernel-mentees] [RFC PATCH v5 02/23] PCI: Add l1ss_cap and l1ss_cap_ptr " Saheed O. Bolarinwa
2020-08-22 20:03 ` [Linux-kernel-mentees] [RFC PATCH v5 03/23] PCI: Rework calc_l*_latency() to take a pci_dev * Saheed O. Bolarinwa
2020-08-22 20:03 ` [Linux-kernel-mentees] [RFC PATCH v5 04/23] PCI: Compute aspm_register_info.support directly Saheed O. Bolarinwa
2020-08-22 20:03 ` [Linux-kernel-mentees] [RFC PATCH v5 05/23] PCI: Read value of aspm_register_info.l1ss_ctl1 directly Saheed O. Bolarinwa
2020-08-22 20:03 ` [Linux-kernel-mentees] [RFC PATCH v5 06/23] PCI: Replace aspm_register_info.l1ss_cap* with their pci_dev version Saheed O. Bolarinwa
2020-08-22 20:03 ` [Linux-kernel-mentees] [RFC PATCH v5 07/23] PCI: Compute aspm_register_info.enable directly Saheed O. Bolarinwa
2020-08-22 20:03 ` [Linux-kernel-mentees] [RFC PATCH v5 08/23] PCI: Remove unused aspm_calc_l1ss_info() arguments Saheed O. Bolarinwa
2020-08-22 20:03 ` [Linux-kernel-mentees] [RFC PATCH v5 09/23] PCI: Remove pcie_get_aspm_reg() and struct aspm_register_info Saheed O. Bolarinwa
2020-08-22 20:03 ` [Linux-kernel-mentees] [RFC PATCH v5 10/23] PCI: Relocate call to aspm_calc_l1ss_info Saheed O. Bolarinwa
2020-08-22 20:03 ` [Linux-kernel-mentees] [RFC PATCH v5 11/23] PCI: Rework and Rename aspm_calc_l1ss_info() Saheed O. Bolarinwa
2020-08-22 20:03 ` [Linux-kernel-mentees] [RFC PATCH v5 12/23] PCI: Add ASPM and CLOCK PM states to struct pci_dev Saheed O. Bolarinwa
2020-08-22 20:03 ` [Linux-kernel-mentees] [RFC PATCH v5 13/23] PCI: Initialise and Update values of pci_dev's PCIe link info Saheed O. Bolarinwa
2020-08-22 20:03 ` Saheed O. Bolarinwa [this message]
2020-08-22 20:03 ` [Linux-kernel-mentees] [RFC PATCH v5 15/23] PCI: Replace pcie_link_state based device list with a pci_dev one Saheed O. Bolarinwa
2020-08-22 20:03 ` [Linux-kernel-mentees] [RFC PATCH v5 16/23] PCI: Remove Exit latencies from struct pcie_link_state Saheed O. Bolarinwa
2020-08-22 20:03 ` [Linux-kernel-mentees] [RFC PATCH v5 17/23] PCI: Remove .clkpm_* " Saheed O. Bolarinwa
2020-08-22 20:03 ` [Linux-kernel-mentees] [RFC PATCH v5 18/23] PCI: Remove .aspm_* " Saheed O. Bolarinwa
2020-08-22 20:03 ` [Linux-kernel-mentees] [RFC PATCH v5 19/23] PCI: Remove .parent " Saheed O. Bolarinwa
2020-08-22 20:03 ` [Linux-kernel-mentees] [RFC PATCH v5 20/23] PCI: Remove .root " Saheed O. Bolarinwa
2020-08-22 20:03 ` [Linux-kernel-mentees] [RFC PATCH v5 21/23] PCI: Remove .downstream " Saheed O. Bolarinwa
2020-08-22 20:03 ` [Linux-kernel-mentees] [RFC PATCH v5 22/23] PCI: Remove .pdev " Saheed O. Bolarinwa
2020-08-22 20:03 ` [Linux-kernel-mentees] [RFC PATCH v5 23/23] PCI: Remove " Saheed O. Bolarinwa
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