From: Alexander Shishkin alexander.shishkin@linux.intel.com
mainline inclusion from mainline-v5.2-rc1 commit aac8da65174a35749fcf21dbca4c1be314b562b5 category: feature bugzilla: https://gitee.com/openeuler/kernel/issues/I47H3V CVE: NA
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We intend to use the interrupt to detect Last Block condition in the MSU driver, which we can use for double-buffering software-managed data transfers.
Add an interrupt handler to the MSU driver.
Signed-off-by: Alexander Shishkin alexander.shishkin@linux.intel.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org Signed-off-by: Jackie Liu liuyun01@kylinos.cn Signed-off-by: Zheng Zengkai zhengzengkai@huawei.com Reviewed-by: Xie XiuQi xiexiuqi@huawei.com Signed-off-by: Yang Yingliang yangyingliang@huawei.com --- drivers/hwtracing/intel_th/core.c | 32 ++++++++++++++ drivers/hwtracing/intel_th/intel_th.h | 4 +- drivers/hwtracing/intel_th/msu.c | 64 ++++++++++++++++++++++++++- drivers/hwtracing/intel_th/msu.h | 8 ++++ 4 files changed, 106 insertions(+), 2 deletions(-)
diff --git a/drivers/hwtracing/intel_th/core.c b/drivers/hwtracing/intel_th/core.c index 8f709228def1..a82ed64c2662 100644 --- a/drivers/hwtracing/intel_th/core.c +++ b/drivers/hwtracing/intel_th/core.c @@ -822,6 +822,28 @@ static const struct file_operations intel_th_output_fops = { .llseek = noop_llseek, };
+static irqreturn_t intel_th_irq(int irq, void *data) +{ + struct intel_th *th = data; + irqreturn_t ret = IRQ_NONE; + struct intel_th_driver *d; + int i; + + for (i = 0; i < th->num_thdevs; i++) { + if (th->thdev[i]->type != INTEL_TH_OUTPUT) + continue; + + d = to_intel_th_driver(th->thdev[i]->dev.driver); + if (d && d->irq) + ret |= d->irq(th->thdev[i]); + } + + if (ret == IRQ_NONE) + pr_warn_ratelimited("nobody cared for irq\n"); + + return ret; +} + /** * intel_th_alloc() - allocate a new Intel TH device and its subdevices * @dev: parent device @@ -861,6 +883,12 @@ intel_th_alloc(struct device *dev, struct intel_th_drvdata *drvdata, th->resource[nr_mmios++] = devres[r]; break; case IORESOURCE_IRQ: + err = devm_request_irq(dev, devres[r].start, + intel_th_irq, IRQF_SHARED, + dev_name(dev), th); + if (err) + goto err_chrdev; + if (th->irq == -1) th->irq = devres[r].start; break; @@ -887,6 +915,10 @@ intel_th_alloc(struct device *dev, struct intel_th_drvdata *drvdata,
return th;
+err_chrdev: + __unregister_chrdev(th->major, 0, TH_POSSIBLE_OUTPUTS, + "intel_th/output"); + err_ida: ida_simple_remove(&intel_th_ida, th->id);
diff --git a/drivers/hwtracing/intel_th/intel_th.h b/drivers/hwtracing/intel_th/intel_th.h index db3ad8ca1c48..59038215489a 100644 --- a/drivers/hwtracing/intel_th/intel_th.h +++ b/drivers/hwtracing/intel_th/intel_th.h @@ -8,6 +8,8 @@ #ifndef __INTEL_TH_H__ #define __INTEL_TH_H__
+#include <linux/irqreturn.h> + /* intel_th_device device types */ enum { /* Devices that generate trace data */ @@ -160,7 +162,7 @@ struct intel_th_driver { void (*disable)(struct intel_th_device *thdev, struct intel_th_output *output); /* output ops */ - void (*irq)(struct intel_th_device *thdev); + irqreturn_t (*irq)(struct intel_th_device *thdev); int (*activate)(struct intel_th_device *thdev); void (*deactivate)(struct intel_th_device *thdev); /* file_operations for those who want a device node */ diff --git a/drivers/hwtracing/intel_th/msu.c b/drivers/hwtracing/intel_th/msu.c index 3cdf85b1ce4f..d665087af647 100644 --- a/drivers/hwtracing/intel_th/msu.c +++ b/drivers/hwtracing/intel_th/msu.c @@ -102,6 +102,7 @@ struct msc_iter { */ struct msc { void __iomem *reg_base; + void __iomem *msu_base; struct intel_th_device *thdev;
struct list_head win_list; @@ -122,7 +123,8 @@ struct msc {
/* config */ unsigned int enabled : 1, - wrap : 1; + wrap : 1, + do_irq : 1; unsigned int mode; unsigned int burst_len; unsigned int index; @@ -476,6 +478,40 @@ static void msc_buffer_clear_hw_header(struct msc *msc) } }
+static int intel_th_msu_init(struct msc *msc) +{ + u32 mintctl, msusts; + + if (!msc->do_irq) + return 0; + + mintctl = ioread32(msc->msu_base + REG_MSU_MINTCTL); + mintctl |= msc->index ? M1BLIE : M0BLIE; + iowrite32(mintctl, msc->msu_base + REG_MSU_MINTCTL); + if (mintctl != ioread32(msc->msu_base + REG_MSU_MINTCTL)) { + dev_info(msc_dev(msc), "MINTCTL ignores writes: no usable interrupts\n"); + msc->do_irq = 0; + return 0; + } + + msusts = ioread32(msc->msu_base + REG_MSU_MSUSTS); + iowrite32(msusts, msc->msu_base + REG_MSU_MSUSTS); + + return 0; +} + +static void intel_th_msu_deinit(struct msc *msc) +{ + u32 mintctl; + + if (!msc->do_irq) + return; + + mintctl = ioread32(msc->msu_base + REG_MSU_MINTCTL); + mintctl &= msc->index ? ~M1BLIE : ~M0BLIE; + iowrite32(mintctl, msc->msu_base + REG_MSU_MINTCTL); +} + /** * msc_configure() - set up MSC hardware * @msc: the MSC device to configure @@ -1295,6 +1331,21 @@ static int intel_th_msc_init(struct msc *msc) return 0; }
+static irqreturn_t intel_th_msc_interrupt(struct intel_th_device *thdev) +{ + struct msc *msc = dev_get_drvdata(&thdev->dev); + u32 msusts = ioread32(msc->msu_base + REG_MSU_MSUSTS); + u32 mask = msc->index ? MSUSTS_MSC1BLAST : MSUSTS_MSC0BLAST; + + if (!(msusts & mask)) { + if (msc->enabled) + return IRQ_HANDLED; + return IRQ_NONE; + } + + return IRQ_HANDLED; +} + static const char * const msc_mode[] = { [MSC_MODE_SINGLE] = "single", [MSC_MODE_MULTI] = "multi", @@ -1500,10 +1551,19 @@ static int intel_th_msc_probe(struct intel_th_device *thdev) if (!msc) return -ENOMEM;
+ res = intel_th_device_get_resource(thdev, IORESOURCE_IRQ, 1); + if (!res) + msc->do_irq = 1; + msc->index = thdev->id;
msc->thdev = thdev; msc->reg_base = base + msc->index * 0x100; + msc->msu_base = base; + + err = intel_th_msu_init(msc); + if (err) + return err;
err = intel_th_msc_init(msc); if (err) @@ -1520,6 +1580,7 @@ static void intel_th_msc_remove(struct intel_th_device *thdev) int ret;
intel_th_msc_deactivate(thdev); + intel_th_msu_deinit(msc);
/* * Buffers should not be used at this point except if the @@ -1533,6 +1594,7 @@ static void intel_th_msc_remove(struct intel_th_device *thdev) static struct intel_th_driver intel_th_msc_driver = { .probe = intel_th_msc_probe, .remove = intel_th_msc_remove, + .irq = intel_th_msc_interrupt, .activate = intel_th_msc_activate, .deactivate = intel_th_msc_deactivate, .fops = &intel_th_msc_fops, diff --git a/drivers/hwtracing/intel_th/msu.h b/drivers/hwtracing/intel_th/msu.h index 9cc8aced6116..e8cb819a3804 100644 --- a/drivers/hwtracing/intel_th/msu.h +++ b/drivers/hwtracing/intel_th/msu.h @@ -11,6 +11,7 @@ enum { REG_MSU_MSUPARAMS = 0x0000, REG_MSU_MSUSTS = 0x0008, + REG_MSU_MINTCTL = 0x0004, /* MSU-global interrupt control */ REG_MSU_MSC0CTL = 0x0100, /* MSC0 control */ REG_MSU_MSC0STS = 0x0104, /* MSC0 status */ REG_MSU_MSC0BAR = 0x0108, /* MSC0 output base address */ @@ -28,6 +29,8 @@ enum {
/* MSUSTS bits */ #define MSUSTS_MSU_INT BIT(0) +#define MSUSTS_MSC0BLAST BIT(16) +#define MSUSTS_MSC1BLAST BIT(24)
/* MSCnCTL bits */ #define MSC_EN BIT(0) @@ -36,6 +39,11 @@ enum { #define MSC_MODE (BIT(4) | BIT(5)) #define MSC_LEN (BIT(8) | BIT(9) | BIT(10))
+/* MINTCTL bits */ +#define MICDE BIT(0) +#define M0BLIE BIT(16) +#define M1BLIE BIT(24) + /* MSC operating modes (MSC_MODE) */ enum { MSC_MODE_SINGLE = 0,