| lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
|
Open Source and information security mailing list archives
| ||
|
Date: Fri, 25 Aug 2017 19:15:58 +0300
From: Alexander Shishkin <alexander.shishkin@...ux.intel.com>
To: Greg KH <greg@...ah.com>
Cc: Mathieu Poirier <mathieu.poirier@...aro.org>,
Chunyan Zhang <zhang.chunyan@...aro.org>,
linux-kernel@...r.kernel.org,
Alexander Shishkin <alexander.shishkin@...ux.intel.com>
Subject: [GIT PULL 07/15] intel_th: Make the switch allocate its subdevices
Instead of allocating devices for every possible output subdevice,
allow the switch to allocate only the ones that it knows about.
Signed-off-by: Alexander Shishkin <alexander.shishkin@...ux.intel.com>
---
drivers/hwtracing/intel_th/core.c | 288 ++++++++++++++++++++++++----------
drivers/hwtracing/intel_th/gth.c | 17 +-
drivers/hwtracing/intel_th/intel_th.h | 13 +-
3 files changed, 230 insertions(+), 88 deletions(-)
diff --git a/drivers/hwtracing/intel_th/core.c b/drivers/hwtracing/intel_th/core.c
index 323d3ac8d4..4f569593db 100644
--- a/drivers/hwtracing/intel_th/core.c
+++ b/drivers/hwtracing/intel_th/core.c
@@ -101,17 +101,53 @@ static int intel_th_probe(struct device *dev)
return ret;
}
+static void intel_th_device_remove(struct intel_th_device *thdev);
+
static int intel_th_remove(struct device *dev)
{
struct intel_th_driver *thdrv = to_intel_th_driver(dev->driver);
struct intel_th_device *thdev = to_intel_th_device(dev);
- struct intel_th_device *hub = to_intel_th_device(dev->parent);
+ struct intel_th_device *hub = to_intel_th_hub(thdev);
int err;
if (thdev->type == INTEL_TH_SWITCH) {
+ struct intel_th *th = to_intel_th(hub);
+ int i, lowest;
+
+ /* disconnect outputs */
err = device_for_each_child(dev, thdev, intel_th_child_remove);
if (err)
return err;
+
+ /*
+ * Remove outputs, that is, hub's children: they are created
+ * at hub's probe time by having the hub call
+ * intel_th_output_enable() for each of them.
+ */
+ for (i = 0, lowest = -1; i < th->num_thdevs; i++) {
+ /*
+ * Move the non-output devices from higher up the
+ * th->thdev[] array to lower positions to maintain
+ * a contiguous array.
+ */
+ if (th->thdev[i]->type != INTEL_TH_OUTPUT) {
+ if (lowest >= 0) {
+ th->thdev[lowest] = th->thdev[i];
+ th->thdev[i] = NULL;
+ ++lowest;
+ }
+
+ continue;
+ }
+
+ if (lowest == -1)
+ lowest = i;
+
+ intel_th_device_remove(th->thdev[i]);
+ th->thdev[i] = NULL;
+ }
+
+ th->num_thdevs = lowest;
}
if (thdrv->attr_group)
@@ -377,7 +413,7 @@ static const struct intel_th_subdevice {
unsigned otype;
unsigned scrpd;
int id;
-} intel_th_subdevices[TH_SUBDEVICE_MAX] = {
+} intel_th_subdevices[] = {
{
.nres = 1,
.res = {
@@ -511,98 +547,181 @@ static inline void intel_th_request_hub_module_flush(struct intel_th *th)
}
#endif /* CONFIG_MODULES */
-static int intel_th_populate(struct intel_th *th, struct resource *devres,
- unsigned int ndevres, int irq)
+static struct intel_th_device *
+intel_th_subdevice_alloc(struct intel_th *th,
+ const struct intel_th_subdevice *subdev)
{
+ struct intel_th_device *thdev;
struct resource res[3];
unsigned int req = 0;
- int src, dst, err;
+ int r, err;
- /* create devices for each intel_th_subdevice */
- for (src = 0, dst = 0; src < ARRAY_SIZE(intel_th_subdevices); src++) {
- const struct intel_th_subdevice *subdev =
- &intel_th_subdevices[src];
- struct intel_th_device *thdev;
- int r;
+ thdev = intel_th_device_alloc(th, subdev->type, subdev->name,
+ subdev->id);
+ if (!thdev)
+ return ERR_PTR(-ENOMEM);
- /* only allow SOURCE and SWITCH devices in host mode */
- if (host_mode && subdev->type == INTEL_TH_OUTPUT)
- continue;
- thdev = intel_th_device_alloc(th, subdev->type, subdev->name,
- subdev->id);
- if (!thdev) {
- err = -ENOMEM;
- goto kill_subdevs;
+ memcpy(res, subdev->res,
+ sizeof(struct resource) * subdev->nres);
+
+ for (r = 0; r < subdev->nres; r++) {
+ struct resource *devres = th->resource;
+ int bar = TH_MMIO_CONFIG;
+
+ /*
+ * Take .end == 0 to mean 'take the whole bar',
+ * .start then tells us which bar it is. Default to
+ * TH_MMIO_CONFIG.
+ */
+ if (!res[r].end && res[r].flags == IORESOURCE_MEM) {
+ bar = res[r].start;
+ res[r].start = 0;
+ res[r].end = resource_size(&devres[bar]) - 1;
}
- memcpy(res, subdev->res,
- sizeof(struct resource) * subdev->nres);
+ if (res[r].flags & IORESOURCE_MEM) {
+ res[r].start += devres[bar].start;
+ res[r].end += devres[bar].start;
- for (r = 0; r < subdev->nres; r++) {
- int bar = TH_MMIO_CONFIG;
+ dev_dbg(th->dev, "%s:%d @ %pR\n",
+ subdev->name, r, &res[r]);
+ } else if (res[r].flags & IORESOURCE_IRQ) {
+ res[r].start = th->irq;
+ }
+ }
- /*
- * Take .end == 0 to mean 'take the whole bar',
- * .start then tells us which bar it is. Default to
- * TH_MMIO_CONFIG.
- */
- if (!res[r].end && res[r].flags == IORESOURCE_MEM) {
- bar = res[r].start;
- res[r].start = 0;
- res[r].end = resource_size(&devres[bar]) - 1;
- }
+ err = intel_th_device_add_resources(thdev, res, subdev->nres);
+ if (err) {
+ put_device(&thdev->dev);
+ goto fail_put_device;
+ }
- if (res[r].flags & IORESOURCE_MEM) {
- res[r].start += devres[bar].start;
- res[r].end += devres[bar].start;
+ if (subdev->type == INTEL_TH_OUTPUT) {
+ thdev->dev.devt = MKDEV(th->major, th->num_thdevs);
+ thdev->output.type = subdev->otype;
+ thdev->output.port = -1;
+ thdev->output.scratchpad = subdev->scrpd;
+ } else if (subdev->type == INTEL_TH_SWITCH) {
+ thdev->host_mode = host_mode;
+ th->hub = thdev;
+ }
- dev_dbg(th->dev, "%s:%d @ %pR\n",
- subdev->name, r, &res[r]);
- } else if (res[r].flags & IORESOURCE_IRQ) {
- res[r].start = irq;
- }
- }
+ err = device_add(&thdev->dev);
+ if (err) {
+ put_device(&thdev->dev);
+ goto fail_free_res;
+ }
- err = intel_th_device_add_resources(thdev, res, subdev->nres);
- if (err) {
- put_device(&thdev->dev);
- goto kill_subdevs;
- }
+ /* need switch driver to be loaded to enumerate the rest */
+ if (subdev->type == INTEL_TH_SWITCH && !req) {
+ err = intel_th_request_hub_module(th);
+ if (!err)
+ req++;
+ }
- if (subdev->type == INTEL_TH_OUTPUT) {
- thdev->dev.devt = MKDEV(th->major, dst);
- thdev->output.type = subdev->otype;
- thdev->output.port = -1;
- thdev->output.scratchpad = subdev->scrpd;
- } else if (subdev->type == INTEL_TH_SWITCH) {
- thdev->host_mode = host_mode;
- }
+ return thdev;
+
+fail_free_res:
+ kfree(thdev->resource);
+
+fail_put_device:
+ put_device(&thdev->dev);
+
+ return ERR_PTR(err);
+}
- err = device_add(&thdev->dev);
- if (err) {
- put_device(&thdev->dev);
- goto kill_subdevs;
+/**
+ * intel_th_output_enable() - find and enable a device for a given output type
+ * @th: Intel TH instance
+ * @otype: output type
+ *
+ * Go through the unallocated output devices, find the first one whos type
+ * matches @otype and instantiate it. These devices are removed when the hub
+ * device is removed, see intel_th_remove().
+ */
+int intel_th_output_enable(struct intel_th *th, unsigned int otype)
+{
+ struct intel_th_device *thdev;
+ int src = 0, dst = 0;
+
+ for (src = 0, dst = 0; dst <= th->num_thdevs; src++, dst++) {
+ for (; src < ARRAY_SIZE(intel_th_subdevices); src++) {
+ if (intel_th_subdevices[src].type != INTEL_TH_OUTPUT)
+ continue;
+
+ if (intel_th_subdevices[src].otype != otype)
+ continue;
+
+ break;
}
- /* need switch driver to be loaded to enumerate the rest */
- if (subdev->type == INTEL_TH_SWITCH && !req) {
- th->hub = thdev;
- err = intel_th_request_hub_module(th);
- if (!err)
- req++;
+ /* no unallocated matching subdevices */
+ if (src == ARRAY_SIZE(intel_th_subdevices))
+ return -ENODEV;
+
+ for (; dst < th->num_thdevs; dst++) {
+ if (th->thdev[dst]->type != INTEL_TH_OUTPUT)
+ continue;
+
+ if (th->thdev[dst]->output.type != otype)
+ continue;
+
+ break;
}
- th->thdev[dst++] = thdev;
+ /*
+ * intel_th_subdevices[src] matches our requirements and is
+ * not matched in th::thdev[]
+ */
+ if (dst == th->num_thdevs)
+ goto found;
}
+ return -ENODEV;
+
+found:
+ thdev = intel_th_subdevice_alloc(th, &intel_th_subdevices[src]);
+ if (IS_ERR(thdev))
+ return PTR_ERR(thdev);
+
+ th->thdev[th->num_thdevs++] = thdev;
+
return 0;
+}
+EXPORT_SYMBOL_GPL(intel_th_output_enable);
-kill_subdevs:
- for (; dst >= 0; dst--)
- intel_th_device_remove(th->thdev[dst]);
+static int intel_th_populate(struct intel_th *th)
+{
+ int src;
- return err;
+ /* create devices for each intel_th_subdevice */
+ for (src = 0; src < ARRAY_SIZE(intel_th_subdevices); src++) {
+ const struct intel_th_subdevice *subdev =
+ &intel_th_subdevices[src];
+ struct intel_th_device *thdev;
+
+ /* only allow SOURCE and SWITCH devices in host mode */
+ if (host_mode && subdev->type == INTEL_TH_OUTPUT)
+ continue;
+
+ /*
+ * don't enable port OUTPUTs in this path; SWITCH enables them
+ * via intel_th_output_enable()
+ */
+ if (subdev->type == INTEL_TH_OUTPUT &&
+ subdev->otype != GTH_NONE)
+ continue;
+
+ thdev = intel_th_subdevice_alloc(th, subdev);
+ /* note: caller should free subdevices from th::thdev[] */
+ if (IS_ERR(thdev))
+ return PTR_ERR(thdev);
+
+ th->thdev[th->num_thdevs++] = thdev;
+ }
+
+ return 0;
}
static int match_devt(struct device *dev, void *data)
@@ -679,24 +798,25 @@ intel_th_alloc(struct device *dev, struct resource *devres,
}
th->dev = dev;
+ th->resource = devres;
+ th->num_resources = ndevres;
+ th->irq = irq;
+
dev_set_drvdata(dev, th);
pm_runtime_no_callbacks(dev);
pm_runtime_put(dev);
pm_runtime_allow(dev);
- err = intel_th_populate(th, devres, ndevres, irq);
- if (err)
- goto err_chrdev;
+ err = intel_th_populate(th);
+ if (err) {
+ /* free the subdevices and undo everything */
+ intel_th_free(th);
+ return ERR_PTR(err);
+ }
return th;
-err_chrdev:
- pm_runtime_forbid(dev);
-
- __unregister_chrdev(th->major, 0, TH_POSSIBLE_OUTPUTS,
- "intel_th/output");
-
err_ida:
ida_simple_remove(&intel_th_ida, th->id);
@@ -712,11 +832,15 @@ void intel_th_free(struct intel_th *th)
int i;
intel_th_request_hub_module_flush(th);
- for (i = 0; i < TH_SUBDEVICE_MAX; i++)
- if (th->thdev[i] && th->thdev[i] != th->hub)
- intel_th_device_remove(th->thdev[i]);
intel_th_device_remove(th->hub);
+ for (i = 0; i < th->num_thdevs; i++) {
+ if (th->thdev[i] != th->hub)
+ intel_th_device_remove(th->thdev[i]);
+ th->thdev[i] = NULL;
+ }
+
+ th->num_thdevs = 0;
pm_runtime_get_sync(th->dev);
pm_runtime_forbid(th->dev);
diff --git a/drivers/hwtracing/intel_th/gth.c b/drivers/hwtracing/intel_th/gth.c
index dd32d0bad6..7d9d667fe0 100644
--- a/drivers/hwtracing/intel_th/gth.c
+++ b/drivers/hwtracing/intel_th/gth.c
@@ -639,6 +639,7 @@ intel_th_gth_set_output(struct intel_th_device *thdev, unsigned int master)
static int intel_th_gth_probe(struct intel_th_device *thdev)
{
struct device *dev = &thdev->dev;
+ struct intel_th *th = dev_get_drvdata(dev->parent);
struct gth_device *gth;
struct resource *res;
void __iomem *base;
@@ -660,6 +661,8 @@ static int intel_th_gth_probe(struct intel_th_device *thdev)
gth->base = base;
spin_lock_init(>h->gth_lock);
+ dev_set_drvdata(dev, gth);
+
/*
* Host mode can be signalled via SW means or via SCRPD_DEBUGGER_IN_USE
* bit. Either way, don't reset HW in this case, and don't export any
@@ -667,7 +670,7 @@ static int intel_th_gth_probe(struct intel_th_device *thdev)
* drivers to ports, see intel_th_gth_assign().
*/
if (thdev->host_mode)
- goto done;
+ return 0;
ret = intel_th_gth_reset(gth);
if (ret) {
@@ -676,7 +679,7 @@ static int intel_th_gth_probe(struct intel_th_device *thdev)
thdev->host_mode = true;
- goto done;
+ return 0;
}
for (i = 0; i < TH_CONFIGURABLE_MASTERS + 1; i++)
@@ -687,6 +690,13 @@ static int intel_th_gth_probe(struct intel_th_device *thdev)
gth->output[i].index = i;
gth->output[i].port_type =
gth_output_parm_get(gth, i, TH_OUTPUT_PARM(port));
+ if (gth->output[i].port_type == GTH_NONE)
+ continue;
+
+ ret = intel_th_output_enable(th, gth->output[i].port_type);
+ /* -ENODEV is ok, we just won't have that device enumerated */
+ if (ret && ret != -ENODEV)
+ return ret;
}
if (intel_th_output_attributes(gth) ||
@@ -698,9 +708,6 @@ static int intel_th_gth_probe(struct intel_th_device *thdev)
return -ENOMEM;
}
-done:
- dev_set_drvdata(dev, gth);
-
return 0;
}
diff --git a/drivers/hwtracing/intel_th/intel_th.h b/drivers/hwtracing/intel_th/intel_th.h
index 6243ac1b8b..d44da50be3 100644
--- a/drivers/hwtracing/intel_th/intel_th.h
+++ b/drivers/hwtracing/intel_th/intel_th.h
@@ -216,6 +216,7 @@ int intel_th_trace_enable(struct intel_th_device *thdev);
int intel_th_trace_disable(struct intel_th_device *thdev);
int intel_th_set_output(struct intel_th_device *thdev,
unsigned int master);
+int intel_th_output_enable(struct intel_th *th, unsigned int otype);
enum {
TH_MMIO_CONFIG = 0,
@@ -223,8 +224,9 @@ enum {
TH_MMIO_END,
};
-#define TH_SUBDEVICE_MAX 6
#define TH_POSSIBLE_OUTPUTS 8
+/* Total number of possible subdevices: outputs + GTH + STH */
+#define TH_SUBDEVICE_MAX (TH_POSSIBLE_OUTPUTS + 2)
#define TH_CONFIGURABLE_MASTERS 256
#define TH_MSC_MAX 2
@@ -233,6 +235,10 @@ enum {
* @dev: driver core's device
* @thdev: subdevices
* @hub: "switch" subdevice (GTH)
+ * @resource: resources of the entire controller
+ * @num_thdevs: number of devices in the @thdev array
+ * @num_resources: number or resources in the @resource array
+ * @irq: irq number
* @id: this Intel TH controller's device ID in the system
* @major: device node major for output devices
*/
@@ -242,6 +248,11 @@ struct intel_th {
struct intel_th_device *thdev[TH_SUBDEVICE_MAX];
struct intel_th_device *hub;
+ struct resource *resource;
+ unsigned int num_thdevs;
+ unsigned int num_resources;
+ int irq;
+
int id;
int major;
#ifdef CONFIG_MODULES
--
2.14.1
Powered by blists - more mailing lists