amd/amdkfd/kfd_flat_memory.c

48  * This pointer space has the Shared(LDS) and Private(Scratch) memory
49  * mapped into this pointer space as apertures.
74  *	HSA64 – 64b pointers and the default address space is ATC
75  *	HSA32 – 32b pointers and the default address space is ATC
76  *	GPUVM – 64b pointers and the default address space is GPUVM (driver
84  * (VA[63:47] == 0x1FFFF) and low area (VA[63:47 == 0) of the address space
86  * the middle of the 64b VA space.
88  * The GPU not only has access to all of the CPU accessible address space via
89  * ATC/IOMMU, but it also has access to the GPUVM address space.  The “system
91  * spaces into a unified pointer space.  The method we take for 64b mode is
92  * to map the full 40b GPUVM address space into the hole of the 64b address
93  * space.
95  * The GPUVM_Base/GPUVM_Limit defines the aperture in the 64b space where we
103  * in the 64b address space even for the GPU.  There are several places in
128  * space. For example a shader program cannot jump in/out between ATC
129  * and GPUVM space.
155  * address space that doesn’t hit any defined base/limit apertures.
191  * instead of two for the S_LOAD and FLAT_* ops. The entire GPUVM space of 40b
193  * space (defined by the aperture) for S_LOAD and FLAT_* ops.
200  * the default aperture is GPUVM (ATC==0) and not ATC space.
209  * space for use by the new FLAT_* vector memory ops.  The Shared and
210  * Private memories are mapped as apertures into the address space,
216  * options in the hole of the 64b address space. For HSA32 mode, the
217  * Shared/Private apertures can be placed anywhere in the 32b space
228  * or ATC space. The addresses that fall in the shared aperture are
235  * in the 32b space except at 0 (Private or Shared Base at zero disables
307 /* User mode manages most of the SVM aperture address space. The low
326 		 * with small reserved space for kernel.  in kfd_init_apertures_vi()
351 	 * reserved space before SVM on Raven as well, even though we don't  in kfd_init_apertures_v9()
389 		 * the x86_64 non canonical process address space  in kfd_init_apertures()
429 				/* dGPUs: the reserved space for kernel  in kfd_init_apertures()