[RFC PATCH v3 1/4] drm/i915: add i915_ved.c to setup bridge for VED
Yao Cheng
yao.cheng at intel.com
Fri Nov 21 11:06:57 PST 2014
Setup minimum required resources during i915_driver_load:
1. Create a platform device to share MMIO/IRQ resources
2. Make the platform device child of i915 device for runtime PM.
3. Create IRQ chip to forward the VED irqs.
VED driver (a standalone drm driver) probes the VED device and
creates a new dri card on install.
Currently only supports VED on valleyview.
Kerneldoc is updated for i915_ved.c.
v2:
take Daniel & Jani's comments
- extract change to new file i915_ved.c
- add kerneldoc
- change 'ipvr-ved' to 'ipvr-vlv-ved' for extensibility
- unregister platdev before irq_free_desc
- add WARN_ON(!intel_irqs_enabled) in irq init code
- remove unnecessary trace point
- remove unnecessary BUG_ON
v3:
take Ville's comments and VED PRIME support
- add HAS_VED() check
- add ved struct to make code neat
- no need to check platform in vlv_irq_handler
- i915_reg.h update
- no need to kmalloc for small amount of resource
- remove unnecessary REG resource
- follow vlv_display_irqs_install() to implement VED mask/unmask
- workaround nommu_map_sg issue by set dma_mask to support VED PRIME.
Signed-off-by: Yao Cheng <yao.cheng at intel.com>
---
Documentation/DocBook/drm.tmpl | 5 +
drivers/gpu/drm/i915/Makefile | 3 +
drivers/gpu/drm/i915/i915_dma.c | 11 ++
drivers/gpu/drm/i915/i915_drv.h | 12 ++
drivers/gpu/drm/i915/i915_irq.c | 2 +
drivers/gpu/drm/i915/i915_reg.h | 4 +
drivers/gpu/drm/i915/i915_ved.c | 255 ++++++++++++++++++++++++++++++++++++++++
7 files changed, 292 insertions(+)
create mode 100644 drivers/gpu/drm/i915/i915_ved.c
diff --git a/Documentation/DocBook/drm.tmpl b/Documentation/DocBook/drm.tmpl
index 9d99772..b2d109f 100644
--- a/Documentation/DocBook/drm.tmpl
+++ b/Documentation/DocBook/drm.tmpl
@@ -3839,6 +3839,11 @@ int num_ioctls;</synopsis>
!Fdrivers/gpu/drm/i915/i915_irq.c intel_runtime_pm_disable_interrupts
!Fdrivers/gpu/drm/i915/i915_irq.c intel_runtime_pm_enable_interrupts
</sect2>
+ <sect2>
+ <title>VED video core integration</title>
+!Pdrivers/gpu/drm/i915/i915_ved.c VED video core integration
+!Idrivers/gpu/drm/i915/i915_ved.c
+ </sect2>
</sect1>
<sect1>
<title>Display Hardware Handling</title>
diff --git a/drivers/gpu/drm/i915/Makefile b/drivers/gpu/drm/i915/Makefile
index 891e584..e2f2776 100644
--- a/drivers/gpu/drm/i915/Makefile
+++ b/drivers/gpu/drm/i915/Makefile
@@ -83,6 +83,9 @@ i915-y += dvo_ch7017.o \
i915-y += i915_dma.o \
i915_ums.o
+# VED for VLV
+i915-y += i915_ved.o
+
obj-$(CONFIG_DRM_I915) += i915.o
CFLAGS_i915_trace_points.o := -I$(src)
diff --git a/drivers/gpu/drm/i915/i915_dma.c b/drivers/gpu/drm/i915/i915_dma.c
index 9a73533..fbf2144 100644
--- a/drivers/gpu/drm/i915/i915_dma.c
+++ b/drivers/gpu/drm/i915/i915_dma.c
@@ -1791,6 +1791,13 @@ int i915_driver_load(struct drm_device *dev, unsigned long flags)
if (IS_GEN5(dev))
intel_gpu_ips_init(dev_priv);
+ if (HAS_VED(dev)) {
+ ret = vlv_setup_ved(dev);
+ if (ret < 0) {
+ DRM_ERROR("failed to setup VED bridge: %d\n", ret);
+ }
+ }
+
intel_runtime_pm_enable(dev_priv);
return 0;
@@ -1833,6 +1840,10 @@ int i915_driver_unload(struct drm_device *dev)
struct drm_i915_private *dev_priv = dev->dev_private;
int ret;
+ if (HAS_VED(dev)) {
+ vlv_teardown_ved(dev);
+ }
+
ret = i915_gem_suspend(dev);
if (ret) {
DRM_ERROR("failed to idle hardware: %d\n", ret);
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index f830596..6cfabac 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -1762,6 +1762,12 @@ struct drm_i915_private {
uint32_t bios_vgacntr;
+ /* necessary resource sharing with ved driver. */
+ struct {
+ struct platform_device *platdev;
+ int irq;
+ } ved;
+
/* Old dri1 support infrastructure, beware the dragons ya fools entering
* here! */
struct i915_dri1_state dri1;
@@ -2257,6 +2263,7 @@ struct drm_i915_cmd_table {
IS_BROADWELL(dev) || IS_VALLEYVIEW(dev))
#define HAS_RC6(dev) (INTEL_INFO(dev)->gen >= 6)
#define HAS_RC6p(dev) (INTEL_INFO(dev)->gen == 6 || IS_IVYBRIDGE(dev))
+#define HAS_VED(dev) (INTEL_INFO(dev)->is_valleyview && IS_GEN7(dev))
#define INTEL_PCH_DEVICE_ID_MASK 0xff00
#define INTEL_PCH_IBX_DEVICE_ID_TYPE 0x3b00
@@ -2851,6 +2858,11 @@ void i915_restore_display_reg(struct drm_device *dev);
void i915_setup_sysfs(struct drm_device *dev_priv);
void i915_teardown_sysfs(struct drm_device *dev_priv);
+/* i915_ved.c */
+int vlv_setup_ved(struct drm_device *dev);
+void vlv_teardown_ved(struct drm_device *dev);
+void vlv_ved_irq_handler(struct drm_device *dev);
+
/* intel_i2c.c */
extern int intel_setup_gmbus(struct drm_device *dev);
extern void intel_teardown_gmbus(struct drm_device *dev);
diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
index 5fff287..a3394de 100644
--- a/drivers/gpu/drm/i915/i915_irq.c
+++ b/drivers/gpu/drm/i915/i915_irq.c
@@ -1865,6 +1865,8 @@ static irqreturn_t valleyview_irq_handler(int irq, void *arg)
snb_gt_irq_handler(dev, dev_priv, gt_iir);
if (pm_iir)
gen6_rps_irq_handler(dev_priv, pm_iir);
+ if (iir & VLV_VED_BLOCK_INTERRUPT)
+ vlv_ved_irq_handler(dev);
/* Call regardless, as some status bits might not be
* signalled in iir */
valleyview_pipestat_irq_handler(dev, iir);
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index d43fa0e..1a46fe5 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -1284,6 +1284,9 @@ enum punit_power_well {
#define VLV_DISPLAY_BASE 0x180000
#define VLV_MIPI_BASE VLV_DISPLAY_BASE
+#define VLV_VED_BASE 0x170000
+#define VLV_VED_SIZE 0x010000
+
#define VLV_GU_CTL0 (VLV_DISPLAY_BASE + 0x2030)
#define VLV_GU_CTL1 (VLV_DISPLAY_BASE + 0x2034)
#define SCPD0 0x0209c /* 915+ only */
@@ -1477,6 +1480,7 @@ enum punit_power_well {
#define ILK_BSD_USER_INTERRUPT (1<<5)
#define I915_PM_INTERRUPT (1<<31)
+#define VLV_VED_BLOCK_INTERRUPT (1<<23)
#define I915_ISP_INTERRUPT (1<<22)
#define I915_LPE_PIPE_B_INTERRUPT (1<<21)
#define I915_LPE_PIPE_A_INTERRUPT (1<<20)
diff --git a/drivers/gpu/drm/i915/i915_ved.c b/drivers/gpu/drm/i915/i915_ved.c
new file mode 100644
index 0000000..982e69e
--- /dev/null
+++ b/drivers/gpu/drm/i915/i915_ved.c
@@ -0,0 +1,255 @@
+/*
+ * Copyright © 2014 Intel Corporation
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ *
+ * Authors:
+ * Yao Cheng <yao.cheng at intel.com>
+ *
+ */
+
+#include "i915_drv.h"
+
+/**
+ * DOC: VED video core integration
+ *
+ * Motivation:
+ * Some platforms (e.g. valleyview) integrates a VED inside GPU to extend the
+ * video decoding capability.
+ * The VED is driven by the standalone drm driver "ipvr" which covers PowerVR
+ * VPUs. Since the PowerVR VPUs are also integrated by non-i915 platforms such
+ * as GMA500, we'd like to keep ipvr driver and i915 driver separated and
+ * independent to each other. To achieve this we do the minimum work in i915
+ * to setup a bridge between ipvr and i915:
+ * 1. Create a platform device to share MMIO/IRQ resources
+ * 2. Make the platform device child of i915 device for runtime PM.
+ * 3. Create IRQ chip to forward the VED irqs.
+ * ipvr driver probes the VED device and creates a new dri card on install.
+ *
+ * Threats:
+ * Due to the restriction in Linux platform device model, user need manually
+ * uninstall ipvr driver before uninstalling i915 module, otherwise he might
+ * run into use-after-free issues after i915 removes the platform device.
+ *
+ * Implementation:
+ * The MMIO/REG platform resources are created according to the registers
+ * specification.
+ * When forwarding VED irqs, the flow control handler selection depends on the
+ * platform, for example on valleyview handle_simple_irq is enough.
+ *
+ */
+
+static struct platform_device* vlv_ved_platdev_create(struct drm_device *dev)
+{
+ int ret;
+ struct resource rsc[2] = { {0}, {0} };
+ struct platform_device *platdev;
+ u64 *dma_mask = NULL;
+ struct drm_i915_private *dev_priv = dev->dev_private;
+
+ if (dev_priv->ved.irq < 0)
+ return ERR_PTR(-EINVAL);
+
+ platdev = platform_device_alloc("ipvr-ved-vlv", -1);
+ if (!platdev) {
+ ret = -ENOMEM;
+ DRM_ERROR("Failed to allocate VED platform device\n");
+ goto err;
+ }
+
+ /* to work-around check_addr in nommu_map_sg() */
+ dma_mask = kmalloc(sizeof(*platdev->dev.dma_mask), GFP_KERNEL);
+ if (!dma_mask) {
+ ret = -ENOMEM;
+ DRM_ERROR("Failed to allocate dma_mask\n");
+ goto err_put_dev;
+ }
+ *dma_mask = DMA_BIT_MASK(31);
+ platdev->dev.dma_mask = dma_mask;
+ platdev->dev.coherent_dma_mask = *dma_mask;
+
+ rsc[0].start = rsc[0].end = dev_priv->ved.irq;
+ rsc[0].flags = IORESOURCE_IRQ;
+ rsc[0].name = "ipvr-ved-vlv-irq";
+
+ rsc[1].start = pci_resource_start(dev->pdev, 0) + VLV_VED_BASE;
+ rsc[1].end = pci_resource_start(dev->pdev, 0) + VLV_VED_BASE + VLV_VED_SIZE;
+ rsc[1].flags = IORESOURCE_MEM;
+ rsc[1].name = "ipvr-ved-vlv-mmio";
+
+ ret = platform_device_add_resources(platdev, rsc, 2);
+ if (ret) {
+ DRM_ERROR("Failed to add resource for VED platform device: %d\n", ret);
+ goto err_put_dev;
+ }
+
+ platdev->dev.parent = dev->dev; /* for VED driver's runtime-PM */
+ ret = platform_device_add(platdev);
+ if (ret) {
+ DRM_ERROR("Failed to add VED platform device: %d\n", ret);
+ goto err_put_dev;
+ }
+
+ return platdev;
+err_put_dev:
+ platform_device_put(platdev);
+err:
+ if (dma_mask)
+ kfree(dma_mask);
+ return ERR_PTR(ret);
+}
+
+static void vlv_ved_platdev_destroy(struct drm_device *dev)
+{
+ struct drm_i915_private *dev_priv = dev->dev_private;
+ if (dev_priv->ved.platdev) {
+ kfree(dev_priv->ved.platdev->dev.dma_mask);
+ platform_device_unregister(dev_priv->ved.platdev);
+ }
+}
+
+static void vlv_ved_irq_unmask(struct irq_data *d)
+{
+ struct drm_device *dev = d->chip_data;
+ struct drm_i915_private *dev_priv = (struct drm_i915_private *) dev->dev_private;
+ unsigned long irqflags;
+ spin_lock_irqsave(&dev_priv->irq_lock, irqflags);
+
+ dev_priv->irq_mask &= ~VLV_VED_BLOCK_INTERRUPT;
+ I915_WRITE(VLV_IIR, VLV_VED_BLOCK_INTERRUPT);
+ I915_WRITE(VLV_IIR, VLV_VED_BLOCK_INTERRUPT);
+ I915_WRITE(VLV_IMR, dev_priv->irq_mask);
+ I915_WRITE(VLV_IER, ~dev_priv->irq_mask);
+ POSTING_READ(VLV_IER);
+
+ spin_unlock_irqrestore(&dev_priv->irq_lock, irqflags);
+}
+
+static void vlv_ved_irq_mask(struct irq_data *d)
+{
+ struct drm_device *dev = d->chip_data;
+ struct drm_i915_private *dev_priv = (struct drm_i915_private *) dev->dev_private;
+ unsigned long irqflags;
+ spin_lock_irqsave(&dev_priv->irq_lock, irqflags);
+
+ dev_priv->irq_mask |= VLV_VED_BLOCK_INTERRUPT;
+ I915_WRITE(VLV_IER, ~dev_priv->irq_mask);
+ I915_WRITE(VLV_IMR, dev_priv->irq_mask);
+ I915_WRITE(VLV_IIR, VLV_VED_BLOCK_INTERRUPT);
+ I915_WRITE(VLV_IIR, VLV_VED_BLOCK_INTERRUPT);
+ POSTING_READ(VLV_IIR);
+
+ spin_unlock_irqrestore(&dev_priv->irq_lock, irqflags);
+}
+
+static struct irq_chip vlv_ved_irqchip = {
+ .name = "ipvr_ved_irqchip",
+ .irq_mask = vlv_ved_irq_mask,
+ .irq_unmask = vlv_ved_irq_unmask,
+};
+
+static int vlv_ved_irq_init(struct drm_device *dev, int irq)
+{
+ struct drm_i915_private *dev_priv = (struct drm_i915_private *) dev->dev_private;
+ WARN_ON(!intel_irqs_enabled(dev_priv));
+ irq_set_chip_and_handler_name(irq,
+ &vlv_ved_irqchip,
+ handle_simple_irq,
+ "ipvr_ved_vlv_irq_handler");
+ return irq_set_chip_data(irq, dev);
+}
+
+/**
+ * vlv_ved_irq_handler() - forwards the VED irq
+ * @dev: the i915 drm device
+ *
+ * the VED irq is forwarded to the irq handler registered by VED driver.
+ */
+void vlv_ved_irq_handler(struct drm_device *dev)
+{
+ int ret;
+ struct drm_i915_private *dev_priv = dev->dev_private;
+ if (dev_priv->ved.irq < 0 && printk_ratelimit()) {
+ DRM_ERROR("invalid ved irq number: %d\n", dev_priv->ved.irq);
+ return;
+ }
+ ret = generic_handle_irq(dev_priv->ved.irq);
+ if (ret && printk_ratelimit()) {
+ DRM_ERROR("error handling vlv ved irq: %d\n", ret);
+ }
+}
+
+/**
+ * vlv_setup_ved() - setup the bridge between VED driver and i915
+ * @dev: the i915 drm device
+ *
+ * set up the minimum required resources for the bridge: irq chip, platform
+ * resource and platform device. i915 device is set as parent of the new
+ * platform device.
+ *
+ * Return: 0 if successful. non-zero if allocation/initialization fails
+ */
+int vlv_setup_ved(struct drm_device *dev)
+{
+ int ret;
+ struct drm_i915_private *dev_priv = dev->dev_private;
+
+ dev_priv->ved.irq = irq_alloc_descs(-1, 0, 1, 0);
+ if (dev_priv->ved.irq < 0) {
+ DRM_ERROR("Failed to allocate IRQ desc: %d\n", dev_priv->ved.irq);
+ ret = dev_priv->ved.irq;
+ goto err;
+ }
+
+ ret = vlv_ved_irq_init(dev, dev_priv->ved.irq);
+ if (ret) {
+ DRM_ERROR("Failed to initialize irqchip for vlv-ved: %d\n", ret);
+ goto err_free_irq;
+ }
+
+ dev_priv->ved.platdev = vlv_ved_platdev_create(dev);
+ if (IS_ERR(dev_priv->ved.platdev)) {
+ ret = PTR_ERR(dev_priv->ved.platdev);
+ DRM_ERROR("Failed to create platform device for vlv-ved: %d\n", ret);
+ goto err_free_irq;
+ }
+
+ return 0;
+err_free_irq:
+ irq_free_desc(dev_priv->ved.irq);
+err:
+ dev_priv->ved.irq = -1;
+ dev_priv->ved.platdev = NULL;
+ return ret;
+}
+
+/**
+ * vlv_teardown_ved() - destroy the bridge between VED driver and i915
+ * @dev: the i915 drm device
+ *
+ * release all the resources for VED <-> i915 bridge.
+ */
+void vlv_teardown_ved(struct drm_device *dev)
+{
+ struct drm_i915_private *dev_priv = dev->dev_private;
+ vlv_ved_platdev_destroy(dev);
+ if (dev_priv->ved.irq >= 0)
+ irq_free_desc(dev_priv->ved.irq);
+}
--
2.1.0
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