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drm/vc4: Add a getparam ioctl for getting the V3D identity regs.

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As I extend the driver to support different V3D revisions, userspace
needs to know what version it's targeting.  This is most easily
detected using the V3D identity registers.

v2: Make sure V3D is runtime PM on when reading the registers.
v3: Switch to a 64-bit param value (suggested by Rob Clark in review)

Signed-off-by: Eric Anholt <eric@anholt.net>
Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch> (v2)
Reviewed-by: Rob Clark <robdclark@gmail.com> (v3, over irc)
This commit is contained in:
Eric Anholt 2016-07-01 13:10:38 -07:00
parent deb4765db3
commit af713795c5
2 changed files with 54 additions and 0 deletions
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42
drivers/gpu/drm/vc4/vc4_drv.c
View File

@ -14,6 +14,7 @@
#include <linux/module.h>
#include <linux/of_platform.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
#include "drm_fb_cma_helper.h"
#include "uapi/drm/vc4_drm.h"
@ -43,6 +44,46 @@ void __iomem *vc4_ioremap_regs(struct platform_device *dev, int index)
return map;
}
static int vc4_get_param_ioctl(struct drm_device *dev, void *data,
struct drm_file *file_priv)
{
struct vc4_dev *vc4 = to_vc4_dev(dev);
struct drm_vc4_get_param *args = data;
int ret;
if (args->pad != 0)
return -EINVAL;
switch (args->param) {
case DRM_VC4_PARAM_V3D_IDENT0:
ret = pm_runtime_get_sync(&vc4->v3d->pdev->dev);
if (ret)
return ret;
args->value = V3D_READ(V3D_IDENT0);
pm_runtime_put(&vc4->v3d->pdev->dev);
break;
case DRM_VC4_PARAM_V3D_IDENT1:
ret = pm_runtime_get_sync(&vc4->v3d->pdev->dev);
if (ret)
return ret;
args->value = V3D_READ(V3D_IDENT1);
pm_runtime_put(&vc4->v3d->pdev->dev);
break;
case DRM_VC4_PARAM_V3D_IDENT2:
ret = pm_runtime_get_sync(&vc4->v3d->pdev->dev);
if (ret)
return ret;
args->value = V3D_READ(V3D_IDENT2);
pm_runtime_put(&vc4->v3d->pdev->dev);
break;
default:
DRM_DEBUG("Unknown parameter %d\n", args->param);
return -EINVAL;
}
return 0;
}
static void vc4_lastclose(struct drm_device *dev)
{
struct vc4_dev *vc4 = to_vc4_dev(dev);
@ -74,6 +115,7 @@ static const struct drm_ioctl_desc vc4_drm_ioctls[] = {
DRM_IOCTL_DEF_DRV(VC4_CREATE_SHADER_BO, vc4_create_shader_bo_ioctl, DRM_RENDER_ALLOW),
DRM_IOCTL_DEF_DRV(VC4_GET_HANG_STATE, vc4_get_hang_state_ioctl,
DRM_ROOT_ONLY),
DRM_IOCTL_DEF_DRV(VC4_GET_PARAM, vc4_get_param_ioctl, DRM_RENDER_ALLOW),
};
static struct drm_driver vc4_drm_driver = {

12
include/uapi/drm/vc4_drm.h
View File

@ -37,6 +37,7 @@ extern "C" {
#define DRM_VC4_MMAP_BO 0x04
#define DRM_VC4_CREATE_SHADER_BO 0x05
#define DRM_VC4_GET_HANG_STATE 0x06
#define DRM_VC4_GET_PARAM 0x07
#define DRM_IOCTL_VC4_SUBMIT_CL DRM_IOWR(DRM_COMMAND_BASE + DRM_VC4_SUBMIT_CL, struct drm_vc4_submit_cl)
#define DRM_IOCTL_VC4_WAIT_SEQNO DRM_IOWR(DRM_COMMAND_BASE + DRM_VC4_WAIT_SEQNO, struct drm_vc4_wait_seqno)
@ -45,6 +46,7 @@ extern "C" {
#define DRM_IOCTL_VC4_MMAP_BO DRM_IOWR(DRM_COMMAND_BASE + DRM_VC4_MMAP_BO, struct drm_vc4_mmap_bo)
#define DRM_IOCTL_VC4_CREATE_SHADER_BO DRM_IOWR(DRM_COMMAND_BASE + DRM_VC4_CREATE_SHADER_BO, struct drm_vc4_create_shader_bo)
#define DRM_IOCTL_VC4_GET_HANG_STATE DRM_IOWR(DRM_COMMAND_BASE + DRM_VC4_GET_HANG_STATE, struct drm_vc4_get_hang_state)
#define DRM_IOCTL_VC4_GET_PARAM DRM_IOWR(DRM_COMMAND_BASE + DRM_VC4_GET_PARAM, struct drm_vc4_get_param)
struct drm_vc4_submit_rcl_surface {
__u32 hindex; /* Handle index, or ~0 if not present. */
@ -280,6 +282,16 @@ struct drm_vc4_get_hang_state {
__u32 pad[16];
};
#define DRM_VC4_PARAM_V3D_IDENT0 0
#define DRM_VC4_PARAM_V3D_IDENT1 1
#define DRM_VC4_PARAM_V3D_IDENT2 2
struct drm_vc4_get_param {
__u32 param;
__u32 pad;
__u64 value;
};
#if defined(__cplusplus)
}
#endif