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intel_th: Make the switch allocate its subdevices

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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@linux.intel.com>
This commit is contained in:
Alexander Shishkin 2017-08-10 18:28:38 +03:00
parent 8edc514b01
commit a753bfcfdb
3 changed files with 236 additions and 94 deletions
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300
drivers/hwtracing/intel_th/core.c
View File

@ -101,17 +101,53 @@ out_pm:
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;
thdev = intel_th_device_alloc(th, subdev->type, subdev->name,
subdev->id);
if (!thdev)
return ERR_PTR(-ENOMEM);
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;
}
if (res[r].flags & IORESOURCE_MEM) {
res[r].start += devres[bar].start;
res[r].end += devres[bar].start;
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;
}
}
err = intel_th_device_add_resources(thdev, res, subdev->nres);
if (err) {
put_device(&thdev->dev);
goto fail_put_device;
}
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;
}
err = device_add(&thdev->dev);
if (err) {
put_device(&thdev->dev);
goto fail_free_res;
}
/* 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++;
}
return thdev;
fail_free_res:
kfree(thdev->resource);
fail_put_device:
put_device(&thdev->dev);
return ERR_PTR(err);
}
/**
* 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;
}
/* 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;
}
/*
* 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);
static int intel_th_populate(struct intel_th *th)
{
int src;
/* create devices for each intel_th_subdevice */
for (src = 0, dst = 0; src < ARRAY_SIZE(intel_th_subdevices); src++) {
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;
int r;
/* 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;
}
/*
* 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;
memcpy(res, subdev->res,
sizeof(struct resource) * subdev->nres);
thdev = intel_th_subdevice_alloc(th, subdev);
/* note: caller should free subdevices from th::thdev[] */
if (IS_ERR(thdev))
return PTR_ERR(thdev);
for (r = 0; r < subdev->nres; r++) {
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;
}
if (res[r].flags & IORESOURCE_MEM) {
res[r].start += devres[bar].start;
res[r].end += devres[bar].start;
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 = intel_th_device_add_resources(thdev, res, subdev->nres);
if (err) {
put_device(&thdev->dev);
goto kill_subdevs;
}
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;
}
err = device_add(&thdev->dev);
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) {
th->hub = thdev;
err = intel_th_request_hub_module(th);
if (!err)
req++;
}
th->thdev[dst++] = thdev;
th->thdev[th->num_thdevs++] = thdev;
}
return 0;
kill_subdevs:
for (; dst >= 0; dst--)
intel_th_device_remove(th->thdev[dst]);
return err;
}
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);

17
drivers/hwtracing/intel_th/gth.c
View File

@ -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(&gth->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;
}

13
drivers/hwtracing/intel_th/intel_th.h
View File

@ -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