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drm/i915/gvt: Make function dpy_reg_mmio_readx safe

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The dpy_reg_mmio_read_x functions directly copy 4 bytes data to the
target address with considering the length. If may cause the target
memory corrupted if the requested length less than 4 bytes. Fix it
for safety even we already have some checking to avoid this happen.
And for convince, the 3 functions are merged.

Signed-off-by: Changbin Du <changbin.du@intel.com>
Signed-off-by: Zhenyu Wang <zhenyuw@linux.intel.com>
This commit is contained in:
Changbin Du 2017-06-13 10:15:26 +08:00 committed by Zhenyu Wang
parent 75e64ff2c2
commit 5cd82b7577
1 changed files with 19 additions and 16 deletions
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35
drivers/gpu/drm/i915/gvt/handlers.c
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@ -366,21 +366,24 @@ static int lcpll_ctl_mmio_write(struct intel_vgpu *vgpu, unsigned int offset,
static int dpy_reg_mmio_read(struct intel_vgpu *vgpu, unsigned int offset,
void *p_data, unsigned int bytes)
{
*(u32 *)p_data = (1 << 17);
return 0;
}
switch (offset) {
case 0xe651c:
case 0xe661c:
case 0xe671c:
case 0xe681c:
vgpu_vreg(vgpu, offset) = 1 << 17;
break;
case 0xe6c04:
vgpu_vreg(vgpu, offset) = 0x3;
break;
case 0xe6e1c:
vgpu_vreg(vgpu, offset) = 0x2f << 16;
break;
default:
return -EINVAL;
}
static int dpy_reg_mmio_read_2(struct intel_vgpu *vgpu, unsigned int offset,
void *p_data, unsigned int bytes)
{
*(u32 *)p_data = 3;
return 0;
}
static int dpy_reg_mmio_read_3(struct intel_vgpu *vgpu, unsigned int offset,
void *p_data, unsigned int bytes)
{
*(u32 *)p_data = (0x2f << 16);
read_vreg(vgpu, offset, p_data, bytes);
return 0;
}
@ -1991,8 +1994,8 @@ static int init_generic_mmio_info(struct intel_gvt *gvt)
MMIO_DH(0xe661c, D_ALL, dpy_reg_mmio_read, NULL);
MMIO_DH(0xe671c, D_ALL, dpy_reg_mmio_read, NULL);
MMIO_DH(0xe681c, D_ALL, dpy_reg_mmio_read, NULL);
MMIO_DH(0xe6c04, D_ALL, dpy_reg_mmio_read_2, NULL);
MMIO_DH(0xe6e1c, D_ALL, dpy_reg_mmio_read_3, NULL);
MMIO_DH(0xe6c04, D_ALL, dpy_reg_mmio_read, NULL);
MMIO_DH(0xe6e1c, D_ALL, dpy_reg_mmio_read, NULL);
MMIO_RO(PCH_PORT_HOTPLUG, D_ALL, 0,
PORTA_HOTPLUG_STATUS_MASK