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Date: Mon, 4 Nov 2013 18:08:06 +0100
From: Frank Haverkamp <haver@...ux.vnet.ibm.com>
To: linux-kernel@...r.kernel.org
Cc: arnd@...db.de, gregkh@...uxfoundation.org, cody@...ux.vnet.ibm.com,
schwidefsky@...ibm.com, utz.bacher@...ibm.com, mmarek@...e.cz,
rmallon@...il.com, jsvogt@...ibm.com, MIJUNG@...ibm.com,
cascardo@...ux.vnet.ibm.com, michael@...ra.de,
haver@...ux.vnet.ibm.com
Subject: [PATCH 6/9] GenWQE: Remove/rework module parameters
The module parameter genwqe_vf_jobtimeout_msec is changed into
a debugfs interface:
/sys/kernel/debug/genwqe/genwqe<n>_card/vf<0..14>_jobtimeout_msec
The setting is applied when the virtual functions are enabled.
Switching during operation is not allowed.
The following thow former module parameters are now constants:
genwqe_pf_jobtimeout_msec
genwqe_health_check_interval
Signed-off-by: Frank Haverkamp <haver@...ux.vnet.ibm.com>
---
Documentation/ABI/testing/debugfs-driver-genwqe | 13 +++
drivers/misc/genwqe/card_base.c | 93 ++++++++++-------------
drivers/misc/genwqe/card_base.h | 9 +-
drivers/misc/genwqe/card_debugfs.c | 15 ++++-
4 files changed, 71 insertions(+), 59 deletions(-)
diff --git a/Documentation/ABI/testing/debugfs-driver-genwqe b/Documentation/ABI/testing/debugfs-driver-genwqe
index c3503a4..548883a 100644
--- a/Documentation/ABI/testing/debugfs-driver-genwqe
+++ b/Documentation/ABI/testing/debugfs-driver-genwqe
@@ -55,3 +55,16 @@ Date: Oct 2013
Contact: haver@...ux.vnet.ibm.com
Description: Possibility to inject error cases to ensure that the drivers
error handling code works well.
+
+What: /sys/kernel/debug/genwqe/genwqe<n>_card/vf<0..14>_jobtimeout_msec
+Date: Oct 2013
+Contact: haver@...ux.vnet.ibm.com
+Description: Default VF timeout 250ms. Testing might require 1000ms.
+ Using 0 will use the cards default value (whatever that is).
+
+ The timeout depends on the max number of available cards
+ in the system and the maximum allowed queue size.
+
+ The driver ensures that the settings are done just before
+ the VFs get enabled. Changing the timeouts in flight is not
+ possible.
diff --git a/drivers/misc/genwqe/card_base.c b/drivers/misc/genwqe/card_base.c
index c649ef7..67ca5bc 100644
--- a/drivers/misc/genwqe/card_base.c
+++ b/drivers/misc/genwqe/card_base.c
@@ -52,40 +52,6 @@ MODULE_DESCRIPTION("GenWQE Card");
MODULE_VERSION(DRV_VERS_STRING);
MODULE_LICENSE("GPL");
-/*
- * We like to be able to disable the health checking entirely in some
- * cases e.g. if a card is broken and needs to be analyzed. I
- * considered using debugfs/sysfs attributes, but I did not see a way
- * to prevent the thread from being started at driver load time other
- * than starting it later manually, what I did not like either
- * in this case (e.g. like the new SRIOV enablement).
- */
-static int genwqe_health_check_interval = 4; /* <= 0: disabled */
-module_param(genwqe_health_check_interval, int, 0644); /* read/writeable */
-MODULE_PARM_DESC(genwqe_health_check_interval,
- "check card health every N seconds (0 = disabled)");
-
-/*
- * GenWQE Driver: Need SLC timeout set to 250ms (temporary setting for
- * testing of 1000ms due to decompressor testcase failing)
- *
- * There is a requirement by the card users that the timeout must not
- * exceed the 250ms.
- *
- * In this case the settings must be done before any interaction to
- * the device can be done, since we cannot change the settings without
- * stopping the queues.
- */
-int genwqe_vf_jobtimeout_msec = 250;
-module_param(genwqe_vf_jobtimeout_msec, int, 0444); /* readable */
-MODULE_PARM_DESC(genwqe_vf_jobtimeout_msec,
- "Job timeout for virtual functions");
-
-int genwqe_pf_jobtimeout_msec = 8000; /* 8sec should be ok */
-module_param(genwqe_pf_jobtimeout_msec, int, 0444); /* readable */
-MODULE_PARM_DESC(genwqe_pf_jobtimeout_msec,
- "Job timeout for physical function");
-
static char genwqe_driver_name[] = GENWQE_DEVNAME;
static struct class *class_genwqe;
static struct dentry *debugfs_genwqe;
@@ -156,7 +122,7 @@ MODULE_DEVICE_TABLE(pci, genwqe_device_table);
*/
static struct genwqe_dev *genwqe_dev_alloc(void)
{
- int i = 0;
+ unsigned int i = 0, j;
struct genwqe_dev *cd;
for (i = 0; i < GENWQE_CARD_NO_MAX; i++) {
@@ -185,6 +151,9 @@ static struct genwqe_dev *genwqe_dev_alloc(void)
cd->ddcb_software_timeout = genwqe_ddcb_software_timeout;
cd->kill_timeout = genwqe_kill_timeout;
+ for (j = 0; j < GENWQE_MAX_VFS; j++)
+ cd->vf_jobtimeout_msec[j] = genwqe_vf_jobtimeout_msec;
+
genwqe_devices[i] = cd;
return cd;
}
@@ -338,7 +307,7 @@ static int genwqe_T_psec(struct genwqe_dev *cd)
}
/**
- * genwqe_setup_jtimer() - Setup PF/VF hardware timeouts for DDCB execution
+ * genwqe_setup_pf_jtimer() - Setup PF hardware timeouts for DDCB execution
*
* Do this _after_ card_reset() is called. Otherwise the values will
* vanish. The settings need to be done when the queues are inactive.
@@ -346,32 +315,43 @@ static int genwqe_T_psec(struct genwqe_dev *cd)
* The max. timeout value is 2^(10+x) * T (6ns for 166MHz) * 15/16.
* The min. timeout value is 2^(10+x) * T (6ns for 166MHz) * 14/16.
*/
-static int genwqe_setup_jtimer(struct genwqe_dev *cd)
+static bool genwqe_setup_pf_jtimer(struct genwqe_dev *cd)
{
- int vf;
u32 T = genwqe_T_psec(cd);
u64 x;
- if (genwqe_pf_jobtimeout_msec != -1) {
- /* PF: large value needed, due to flash update 2sec
- per block */
- x = ilog2(genwqe_pf_jobtimeout_msec *
- 16000000000uL/(T * 15)) - 10;
- genwqe_write_jtimer(cd, 0, (0xff00 | (x & 0xff)));
- }
+ if (genwqe_pf_jobtimeout_msec == 0)
+ return false;
+
+ /* PF: large value needed, flash update 2sec per block */
+ x = ilog2(genwqe_pf_jobtimeout_msec *
+ 16000000000uL/(T * 15)) - 10;
- if (genwqe_vf_jobtimeout_msec != -1) {
- if (cd->num_vfs < 0)
- return cd->num_vfs;
+ genwqe_write_jtimer(cd, 0, (0xff00 | (x & 0xff)));
+ return true;
+}
- x = ilog2(genwqe_vf_jobtimeout_msec *
+/**
+ * genwqe_setup_vf_jtimer() - Setup VF hardware timeouts for DDCB execution
+ */
+static bool genwqe_setup_vf_jtimer(struct genwqe_dev *cd)
+{
+ struct pci_dev *pci_dev = cd->pci_dev;
+ unsigned int vf;
+ u32 T = genwqe_T_psec(cd);
+ u64 x;
+
+ for (vf = 0; vf < pci_sriov_get_totalvfs(pci_dev); vf++) {
+
+ if (cd->vf_jobtimeout_msec[vf] == 0)
+ continue;
+
+ x = ilog2(cd->vf_jobtimeout_msec[vf] *
16000000000uL/(T * 15)) - 10;
- for (vf = 0; vf < cd->num_vfs; vf++)
- genwqe_write_jtimer(cd, vf + 1, (0xff00 | (x & 0xff)));
+ genwqe_write_jtimer(cd, vf + 1, (0xff00 | (x & 0xff)));
}
-
- return 0;
+ return true;
}
static int genwqe_ffdc_buffs_alloc(struct genwqe_dev *cd)
@@ -537,7 +517,9 @@ static int genwqe_start(struct genwqe_dev *cd)
if (genwqe_is_privileged(cd)) { /* code is running _after_ reset */
genwqe_tweak_hardware(cd);
- genwqe_setup_jtimer(cd); /* queues must not run */
+
+ genwqe_setup_pf_jtimer(cd);
+ genwqe_setup_vf_jtimer(cd);
}
err = genwqe_device_create(cd);
@@ -1142,7 +1124,10 @@ static void genwqe_err_resume(struct pci_dev *dev)
static int genwqe_sriov_configure(struct pci_dev *dev, int numvfs)
{
+ struct genwqe_dev *cd = dev_get_drvdata(&dev->dev);
+
if (numvfs > 0) {
+ genwqe_setup_vf_jtimer(cd);
pci_enable_sriov(dev, numvfs);
return numvfs;
}
diff --git a/drivers/misc/genwqe/card_base.h b/drivers/misc/genwqe/card_base.h
index 62c2356..21cef33 100644
--- a/drivers/misc/genwqe/card_base.h
+++ b/drivers/misc/genwqe/card_base.h
@@ -43,6 +43,7 @@
#define GENWQE_MSI_IRQS 4 /* Just one supported, no MSIx */
#define GENWQE_FLAG_MSI_ENABLED (1 << 0)
+#define GENWQE_MAX_VFS 15 /* maximum 15 VFs are possible */
#define GENWQE_MAX_FUNCS 16 /* 1 PF and 15 VFs */
#define GENWQE_CARD_NO_MAX (16 * GENWQE_MAX_FUNCS)
@@ -51,10 +52,9 @@
#define genwqe_polling_enabled 0 /* in case of irqs not working */
#define genwqe_ddcb_software_timeout 10 /* timeout per DDCB in seconds */
#define genwqe_kill_timeout 8 /* time until process gets killed */
-
-/* Module parameters */
-extern int genwqe_pf_jobtimeout_msec;
-extern int genwqe_vf_jobtimeout_msec;
+#define genwqe_vf_jobtimeout_msec 250 /* 250 msec */
+#define genwqe_pf_jobtimeout_msec 8000 /* 8 sec should be ok */
+#define genwqe_health_check_interval 4 /* <= 0: disabled */
/*
* Config space for Genwqe5 A7:
@@ -318,6 +318,7 @@ struct genwqe_dev {
void __iomem *mmio; /* BAR-0 MMIO start */
unsigned long mmio_len;
u16 num_vfs;
+ u32 vf_jobtimeout_msec[GENWQE_MAX_VFS];
int is_privileged; /* access to all regs possible */
/* config regs which we need often */
diff --git a/drivers/misc/genwqe/card_debugfs.c b/drivers/misc/genwqe/card_debugfs.c
index 6a048a1..ebf2f93 100644
--- a/drivers/misc/genwqe/card_debugfs.c
+++ b/drivers/misc/genwqe/card_debugfs.c
@@ -271,7 +271,7 @@ static int genwqe_jtimer_show(struct seq_file *s, void *unused)
for (vf_num = 0; vf_num < cd->num_vfs; vf_num++) {
jtimer = genwqe_read_jtimer(cd, vf_num + 1);
seq_printf(s, " VF%-2d 0x%016llx %d msec\n", vf_num, jtimer,
- genwqe_vf_jobtimeout_msec);
+ cd->vf_jobtimeout_msec[vf_num]);
}
return 0;
}
@@ -425,6 +425,8 @@ int genwqe_init_debugfs(struct genwqe_dev *cd)
struct dentry *file;
int ret, priv;
char card_name[64];
+ char name[64];
+ unsigned int i;
sprintf(card_name, "%s%u_card", GENWQE_DEVNAME, cd->card_idx);
@@ -538,6 +540,17 @@ int genwqe_init_debugfs(struct genwqe_dev *cd)
goto err1;
}
+ for (i = 0; i < GENWQE_MAX_VFS; i++) {
+ sprintf(name, "vf%d_jobtimeout_msec", i);
+
+ file = debugfs_create_u32(name, 0666, root,
+ &cd->vf_jobtimeout_msec[i]);
+ if (!file) {
+ ret = -ENOMEM;
+ goto err1;
+ }
+ }
+
file = debugfs_create_file("jobtimer", S_IRUGO, root, cd,
&genwqe_jtimer_fops);
if (!file) {
--
1.7.1
--
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