[Intel-gfx] [PXP CLEAN PATCH v06 05/27] drm/i915/pxp: Enable ioctl action to set the ring3 context

Sean Z Huang
2020-11-14T00:37:37Z

Enable one ioctl action to allow ring3 driver to set its ring3
context, so ring0 PXP can track the context id through this ring3
context list.

Signed-off-by: Huang, Sean Z <sean.z.huang@intel.com>
---
drivers/gpu/drm/i915/i915_drv.c | 1 +
drivers/gpu/drm/i915/pxp/intel_pxp.c | 66 ++++++++++++++++++++
drivers/gpu/drm/i915/pxp/intel_pxp.h | 16 +++++
drivers/gpu/drm/i915/pxp/intel_pxp_context.c | 34 ++++++++++
drivers/gpu/drm/i915/pxp/intel_pxp_context.h | 3 +
include/uapi/drm/i915_drm.h | 2 +
6 files changed, 122 insertions(+)

diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c
index c8b9c42fcbd6..43ea85b5f14b 100644
--- a/drivers/gpu/drm/i915/i915_drv.c
+++ b/drivers/gpu/drm/i915/i915_drv.c
@@ -1761,6 +1761,7 @@ static const struct drm_ioctl_desc i915_ioctls[] = {
DRM_IOCTL_DEF_DRV(I915_QUERY, i915_query_ioctl, DRM_RENDER_ALLOW),
DRM_IOCTL_DEF_DRV(I915_GEM_VM_CREATE, i915_gem_vm_create_ioctl, DRM_RENDER_ALLOW),
DRM_IOCTL_DEF_DRV(I915_GEM_VM_DESTROY, i915_gem_vm_destroy_ioctl, DRM_RENDER_ALLOW),
+ DRM_IOCTL_DEF_DRV(I915_PXP_OPS, i915_pxp_ops_ioctl, DRM_RENDER_ALLOW),
};

static const struct drm_driver driver = {
diff --git a/drivers/gpu/drm/i915/pxp/intel_pxp.c b/drivers/gpu/drm/i915/pxp/intel_pxp.c
index 3a24c2b13b14..a83fa7cd749f 100644
--- a/drivers/gpu/drm/i915/pxp/intel_pxp.c
+++ b/drivers/gpu/drm/i915/pxp/intel_pxp.c
@@ -8,6 +8,70 @@
#include "intel_pxp_context.h"
#include "intel_pxp_sm.h"

+int i915_pxp_ops_ioctl(struct drm_device *dev, void *data, struct drm_file *drmfile)
+{
+ int ret;
+ struct pxp_info pxp_info = {0};
+ struct drm_i915_pxp_ops *pxp_ops = data;
+ struct drm_i915_private *i915 = to_i915(dev);
+
+ drm_dbg(&i915->drm, ">>> %s\n", __func__);
+
+ if (!i915 || !drmfile || !pxp_ops || pxp_ops->pxp_info_size != sizeof(pxp_info)) {
+ drm_dbg(&i915->drm, "Failed to %s, invalid params\n", __func__);
+ ret = -EINVAL;
+ goto end;
+ }
+
+ if (copy_from_user(&pxp_info, (void __user *)pxp_ops->pxp_info_ptr, sizeof(pxp_info)) != 0) {
+ ret = -EFAULT;
+ goto end;
+ }
+
+ drm_dbg(&i915->drm, "i915 pxp ioctl call with action=[%d]\n", pxp_info.action);
+
+ mutex_lock(&i915->pxp.r0ctx->ctx_mutex);
+
+ if (i915->pxp.r0ctx->global_state_in_suspend) {
+ drm_dbg(&i915->drm, "Return failure due to state in suspend\n");
+ pxp_info.sm_status = PXP_SM_STATUS_SESSION_NOT_AVAILABLE;
+ ret = 0;
+ goto end;
+ }
+
+ if (i915->pxp.r0ctx->global_state_attacked) {
+ drm_dbg(&i915->drm, "Retry required due to state attacked\n");
+ pxp_info.sm_status = PXP_SM_STATUS_RETRY_REQUIRED;
+ ret = 0;
+ goto end;
+ }
+
+ switch (pxp_info.action) {
+ case PXP_ACTION_SET_R3_CONTEXT:
+ {
+ ret = intel_pxp_set_r3ctx(i915, pxp_info.set_r3ctx);
+ break;
+ }
+ default:
+ drm_dbg(&i915->drm, "Failed to %s due to bad params\n", __func__);
+ ret = -EINVAL;
+ goto end;
+ }
+
+end:
+ mutex_unlock(&i915->pxp.r0ctx->ctx_mutex);
+
+ if (ret == 0)
+ if (copy_to_user((void __user *)pxp_ops->pxp_info_ptr, &pxp_info, sizeof(pxp_info)) != 0)
+ ret = -EFAULT;
+
+ if (ret)
+ dev_err(&dev->pdev->dev, "pid=%d, ret = %d\n", task_pid_nr(current), ret);
+
+ drm_dbg(&i915->drm, "<<< %s\n", __func__);
+ return ret;
+}
+
static void intel_pxp_write_irq_mask_reg(struct drm_i915_private *i915, u32 mask)
{
WARN_ON(INTEL_GEN(i915) < 11);
@@ -39,6 +103,8 @@ static int intel_pxp_teardown_required_callback(struct drm_i915_private *i915)
i915->pxp.r0ctx->global_state_attacked = true;
i915->pxp.r0ctx->flag_display_hm_surface_keys = false;

+ intel_pxp_destroy_r3ctx_list(i915);
+
mutex_unlock(&i915->pxp.r0ctx->ctx_mutex);

return 0;
diff --git a/drivers/gpu/drm/i915/pxp/intel_pxp.h b/drivers/gpu/drm/i915/pxp/intel_pxp.h
index 4dec35bb834d..21a6964fc64e 100644
--- a/drivers/gpu/drm/i915/pxp/intel_pxp.h
+++ b/drivers/gpu/drm/i915/pxp/intel_pxp.h
@@ -24,6 +24,21 @@ enum pxp_sm_session_req {
PXP_SM_REQ_SESSION_TERMINATE
};

+#define PXP_ACTION_SET_R3_CONTEXT 5
+
+enum pxp_sm_status {
+ PXP_SM_STATUS_SUCCESS,
+ PXP_SM_STATUS_RETRY_REQUIRED,
+ PXP_SM_STATUS_SESSION_NOT_AVAILABLE,
+ PXP_SM_STATUS_ERROR_UNKNOWN
+};
+
+struct pxp_info {
+ u32 action;
+ u32 sm_status;
+ u32 set_r3ctx;
+} __packed;
+
struct pxp_context;

struct intel_pxp {
@@ -37,6 +52,7 @@ struct intel_pxp {
struct intel_gt;
struct drm_i915_private;

+int i915_pxp_ops_ioctl(struct drm_device *dev, void *data, struct drm_file *drmfile);
void intel_pxp_irq_handler(struct intel_gt *gt, u16 iir);
int i915_pxp_teardown_required_callback(struct drm_i915_private *i915);
int i915_pxp_global_terminate_complete_callback(struct drm_i915_private *i915);
diff --git a/drivers/gpu/drm/i915/pxp/intel_pxp_context.c b/drivers/gpu/drm/i915/pxp/intel_pxp_context.c
index daa93f9bd595..6512e6e1f11a 100644
--- a/drivers/gpu/drm/i915/pxp/intel_pxp_context.c
+++ b/drivers/gpu/drm/i915/pxp/intel_pxp_context.c
@@ -50,3 +50,37 @@ void intel_pxp_destroy_r0ctx(struct drm_i915_private *i915)
kfree(i915->pxp.r0ctx);
i915->pxp.r0ctx = NULL;
}
+
+int intel_pxp_set_r3ctx(struct drm_i915_private *i915, u32 r3ctx_in)
+{
+ struct pxp_r3ctx *r3ctx;
+
+ drm_dbg(&i915->drm, ">>> %s u3ctx_in=[%d]\n", __func__, r3ctx_in);
+
+ r3ctx = kzalloc(sizeof(*r3ctx), GFP_KERNEL);
+ if (!r3ctx) {
+ drm_dbg(&i915->drm, "Failed to kzalloc()\n");
+ return -ENOMEM;
+ }
+
+ r3ctx->r3ctx = r3ctx_in;
+
+ list_add(&r3ctx->listhead, &i915->pxp.r0ctx->r3ctx_list);
+ return 0;
+}
+
+void intel_pxp_destroy_r3ctx_list(struct drm_i915_private *i915)
+{
+ struct pxp_r3ctx *r3ctx, *n;
+
+ drm_dbg(&i915->drm, ">>> %s\n", __func__);
+
+ list_for_each_entry_safe(r3ctx, n, &i915->pxp.r0ctx->r3ctx_list, listhead) {
+ drm_dbg(&i915->drm, "Destroy r3ctx_list u3ctx->r3ctx=[%d]\n", r3ctx->r3ctx);
+
+ list_del(&r3ctx->listhead);
+ kfree(r3ctx);
+ }
+
+ drm_dbg(&i915->drm, "<<< %s\n", __func__);
+}
diff --git a/drivers/gpu/drm/i915/pxp/intel_pxp_context.h b/drivers/gpu/drm/i915/pxp/intel_pxp_context.h
index 3111c88c4972..bffef0fe5fd7 100644
--- a/drivers/gpu/drm/i915/pxp/intel_pxp_context.h
+++ b/drivers/gpu/drm/i915/pxp/intel_pxp_context.h
@@ -39,4 +39,7 @@ struct pxp_r3ctx {
struct pxp_context *intel_pxp_create_r0ctx(struct drm_i915_private *i915);
void intel_pxp_destroy_r0ctx(struct drm_i915_private *i915);

+int intel_pxp_set_r3ctx(struct drm_i915_private *i915, u32 r3ctx);
+void intel_pxp_destroy_r3ctx_list(struct drm_i915_private *i915);
+
#endif /* __INTEL_PXP_CONTEXT_H__ */
diff --git a/include/uapi/drm/i915_drm.h b/include/uapi/drm/i915_drm.h
index dc101264176b..180f97fd91dc 100644
--- a/include/uapi/drm/i915_drm.h
+++ b/include/uapi/drm/i915_drm.h
@@ -359,6 +359,7 @@ typedef struct _drm_i915_sarea {
#define DRM_I915_QUERY 0x39
#define DRM_I915_GEM_VM_CREATE 0x3a
#define DRM_I915_GEM_VM_DESTROY 0x3b
+#define DRM_I915_PXP_OPS 0x3c
/* Must be kept compact -- no holes */

#define DRM_IOCTL_I915_INIT DRM_IOW( DRM_COMMAND_BASE + DRM_I915_INIT, drm_i915_init_t)
@@ -422,6 +423,7 @@ typedef struct _drm_i915_sarea {
#define DRM_IOCTL_I915_QUERY DRM_IOWR(DRM_COMMAND_BASE + DRM_I915_QUERY, struct drm_i915_query)
#define DRM_IOCTL_I915_GEM_VM_CREATE DRM_IOWR(DRM_COMMAND_BASE + DRM_I915_GEM_VM_CREATE, struct drm_i915_gem_vm_control)
#define DRM_IOCTL_I915_GEM_VM_DESTROY DRM_IOW (DRM_COMMAND_BASE + DRM_I915_GEM_VM_DESTROY, struct drm_i915_gem_vm_control)
+#define DRM_IOCTL_I915_PXP_OPS DRM_IOWR(DRM_COMMAND_BASE + DRM_I915_PXP_OPS, struct drm_i915_pxp_ops)

/* Allow drivers to submit batchbuffers directly to hardware, relying
* on the security mechanisms provided by hardware.