tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: 69119673bd50b176ded34032fadd41530fb5af21 commit: c12b84d6e0d70f1185e6daddfd12afb671791b6e drm/amdgpu: use the BAR if possible in amdgpu_device_vram_access v2 date: 4 months ago config: x86_64-randconfig-s022-20200617 (attached as .config) compiler: gcc-9 (Debian 9.3.0-13) 9.3.0 reproduce: # apt-get install sparse # sparse version: v0.6.2-rc1-6-g78f577f8-dirty git checkout c12b84d6e0d70f1185e6daddfd12afb671791b6e # save the attached .config to linux build tree make W=1 C=1 ARCH=x86_64 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; sparse warnings: (new ones prefixed by >>) drivers/gpu/drm/amd/amdgpu/amdgpu_device.c:442:39: sparse: sparse: cast removes address space '<asn:2>' of expression drivers/gpu/drm/amd/amdgpu/amdgpu_device.c:462:31: sparse: sparse: cast removes address space '<asn:2>' of expression drivers/gpu/drm/amd/amdgpu/amdgpu_device.c:1551:65: sparse: sparse: cast to restricted __le32 drivers/gpu/drm/amd/amdgpu/amdgpu_device.c:1556:55: sparse: sparse: cast to restricted __le32 drivers/gpu/drm/amd/amdgpu/amdgpu_device.c:1557:50: sparse: sparse: cast to restricted __le32 drivers/gpu/drm/amd/amdgpu/amdgpu_device.c:1558:50: sparse: sparse: cast to restricted __le32 drivers/gpu/drm/amd/amdgpu/amdgpu_device.c:1559:56: sparse: sparse: cast to restricted __le32 drivers/gpu/drm/amd/amdgpu/amdgpu_device.c:1561:25: sparse: sparse: cast to restricted __le32 drivers/gpu/drm/amd/amdgpu/amdgpu_device.c:1562:45: sparse: sparse: cast to restricted __le32 drivers/gpu/drm/amd/amdgpu/amdgpu_device.c:1563:51: sparse: sparse: cast to restricted __le32 drivers/gpu/drm/amd/amdgpu/amdgpu_device.c:1564:55: sparse: sparse: cast to restricted __le32 drivers/gpu/drm/amd/amdgpu/amdgpu_device.c:1565:57: sparse: sparse: cast to restricted __le32 drivers/gpu/drm/amd/amdgpu/amdgpu_device.c:1567:25: sparse: sparse: cast to restricted __le32 drivers/gpu/drm/amd/amdgpu/amdgpu_device.c:1568:53: sparse: sparse: cast to restricted __le32 drivers/gpu/drm/amd/amdgpu/amdgpu_device.c:1570:25: sparse: sparse: cast to restricted __le32 drivers/gpu/drm/amd/amdgpu/amdgpu_device.c:1572:25: sparse: sparse: cast to restricted __le32 drivers/gpu/drm/amd/amdgpu/amdgpu_device.c:1573:46: sparse: sparse: cast to restricted __le32 drivers/gpu/drm/amd/amdgpu/amdgpu_device.c:1577:73: sparse: sparse: cast to restricted __le32 drivers/gpu/drm/amd/amdgpu/amdgpu_device.c:1579:33: sparse: sparse: cast to restricted __le32 drivers/gpu/drm/amd/amdgpu/amdgpu_device.c:1581:33: sparse: sparse: cast to restricted __le32 drivers/gpu/drm/amd/amdgpu/amdgpu_device.c:1592:73: sparse: sparse: cast to restricted __le32 vim +192 drivers/gpu/drm/amd/amdgpu/amdgpu_device.c 171 172 /** 173 * VRAM access helper functions. 174 * 175 * amdgpu_device_vram_access - read/write a buffer in vram 176 * 177 * @adev: amdgpu_device pointer 178 * @pos: offset of the buffer in vram 179 * @buf: virtual address of the buffer in system memory 180 * @size: read/write size, sizeof(@buf) must > @size 181 * @write: true - write to vram, otherwise - read from vram 182 */ 183 void amdgpu_device_vram_access(struct amdgpu_device *adev, loff_t pos, 184 uint32_t *buf, size_t size, bool write) 185 { 186 unsigned long flags; 187 uint32_t hi = ~0; 188 uint64_t last; 189 190 191 #ifdef CONFIG_64BIT 193 if (last > pos) { 194 void __iomem *addr = adev->mman.aper_base_kaddr + pos; 195 size_t count = last - pos; 196 197 if (write) { 198 memcpy_toio(addr, buf, count); 199 mb(); 200 amdgpu_asic_flush_hdp(adev, NULL); 201 } else { 202 amdgpu_asic_invalidate_hdp(adev, NULL); 203 mb(); 204 memcpy_fromio(buf, addr, count); 205 } 206 207 if (count == size) 208 return; 209 210 pos += count; 211 buf += count / 4; 212 size -= count; 213 } 214 #endif 215 216 spin_lock_irqsave(&adev->mmio_idx_lock, flags); 217 for (last = pos + size; pos < last; pos += 4) { 218 uint32_t tmp = pos >> 31; 219 220 WREG32_NO_KIQ(mmMM_INDEX, ((uint32_t)pos) | 0x80000000); 221 if (tmp != hi) { 222 WREG32_NO_KIQ(mmMM_INDEX_HI, tmp); 223 hi = tmp; 224 } 225 if (write) 226 WREG32_NO_KIQ(mmMM_DATA, *buf++); 227 else 228 *buf++ = RREG32_NO_KIQ(mmMM_DATA); 229 } 230 spin_unlock_irqrestore(&adev->mmio_idx_lock, flags); 231 } 232 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org