kfd_doorbell.c 7.9 KB
Newer Older
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25
/*
 * Copyright 2014 Advanced Micro Devices, Inc.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 * OTHER DEALINGS IN THE SOFTWARE.
 */
#include "kfd_priv.h"
#include <linux/mm.h>
#include <linux/mman.h>
#include <linux/slab.h>
26
#include <linux/io.h>
27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256

/*
 * This extension supports a kernel level doorbells management for
 * the kernel queues.
 * Basically the last doorbells page is devoted to kernel queues
 * and that's assures that any user process won't get access to the
 * kernel doorbells page
 */
static DEFINE_MUTEX(doorbell_mutex);
static unsigned long doorbell_available_index[
	DIV_ROUND_UP(KFD_MAX_NUM_OF_QUEUES_PER_PROCESS, BITS_PER_LONG)] = { 0 };

#define KERNEL_DOORBELL_PASID 1
#define KFD_SIZE_OF_DOORBELL_IN_BYTES 4

/*
 * Each device exposes a doorbell aperture, a PCI MMIO aperture that
 * receives 32-bit writes that are passed to queues as wptr values.
 * The doorbells are intended to be written by applications as part
 * of queueing work on user-mode queues.
 * We assign doorbells to applications in PAGE_SIZE-sized and aligned chunks.
 * We map the doorbell address space into user-mode when a process creates
 * its first queue on each device.
 * Although the mapping is done by KFD, it is equivalent to an mmap of
 * the /dev/kfd with the particular device encoded in the mmap offset.
 * There will be other uses for mmap of /dev/kfd, so only a range of
 * offsets (KFD_MMAP_DOORBELL_START-END) is used for doorbells.
 */

/* # of doorbell bytes allocated for each process. */
static inline size_t doorbell_process_allocation(void)
{
	return roundup(KFD_SIZE_OF_DOORBELL_IN_BYTES *
			KFD_MAX_NUM_OF_QUEUES_PER_PROCESS,
			PAGE_SIZE);
}

/* Doorbell calculations for device init. */
void kfd_doorbell_init(struct kfd_dev *kfd)
{
	size_t doorbell_start_offset;
	size_t doorbell_aperture_size;
	size_t doorbell_process_limit;

	/*
	 * We start with calculations in bytes because the input data might
	 * only be byte-aligned.
	 * Only after we have done the rounding can we assume any alignment.
	 */

	doorbell_start_offset =
			roundup(kfd->shared_resources.doorbell_start_offset,
					doorbell_process_allocation());

	doorbell_aperture_size =
			rounddown(kfd->shared_resources.doorbell_aperture_size,
					doorbell_process_allocation());

	if (doorbell_aperture_size > doorbell_start_offset)
		doorbell_process_limit =
			(doorbell_aperture_size - doorbell_start_offset) /
						doorbell_process_allocation();
	else
		doorbell_process_limit = 0;

	kfd->doorbell_base = kfd->shared_resources.doorbell_physical_address +
				doorbell_start_offset;

	kfd->doorbell_id_offset = doorbell_start_offset / sizeof(u32);
	kfd->doorbell_process_limit = doorbell_process_limit - 1;

	kfd->doorbell_kernel_ptr = ioremap(kfd->doorbell_base,
						doorbell_process_allocation());

	BUG_ON(!kfd->doorbell_kernel_ptr);

	pr_debug("kfd: doorbell initialization:\n");
	pr_debug("kfd: doorbell base           == 0x%08lX\n",
			(uintptr_t)kfd->doorbell_base);

	pr_debug("kfd: doorbell_id_offset      == 0x%08lX\n",
			kfd->doorbell_id_offset);

	pr_debug("kfd: doorbell_process_limit  == 0x%08lX\n",
			doorbell_process_limit);

	pr_debug("kfd: doorbell_kernel_offset  == 0x%08lX\n",
			(uintptr_t)kfd->doorbell_base);

	pr_debug("kfd: doorbell aperture size  == 0x%08lX\n",
			kfd->shared_resources.doorbell_aperture_size);

	pr_debug("kfd: doorbell kernel address == 0x%08lX\n",
			(uintptr_t)kfd->doorbell_kernel_ptr);
}

int kfd_doorbell_mmap(struct kfd_process *process, struct vm_area_struct *vma)
{
	phys_addr_t address;
	struct kfd_dev *dev;

	/*
	 * For simplicitly we only allow mapping of the entire doorbell
	 * allocation of a single device & process.
	 */
	if (vma->vm_end - vma->vm_start != doorbell_process_allocation())
		return -EINVAL;

	/* Find kfd device according to gpu id */
	dev = kfd_device_by_id(vma->vm_pgoff);
	if (dev == NULL)
		return -EINVAL;

	/* Find if pdd exists for combination of process and gpu id */
	if (!kfd_get_process_device_data(dev, process, 0))
		return -EINVAL;

	/* Calculate physical address of doorbell */
	address = kfd_get_process_doorbells(dev, process);

	vma->vm_flags |= VM_IO | VM_DONTCOPY | VM_DONTEXPAND | VM_NORESERVE |
				VM_DONTDUMP | VM_PFNMAP;

	vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);

	pr_debug("kfd: mapping doorbell page in kfd_doorbell_mmap\n"
		 "     target user address == 0x%08llX\n"
		 "     physical address    == 0x%08llX\n"
		 "     vm_flags            == 0x%04lX\n"
		 "     size                == 0x%04lX\n",
		 (unsigned long long) vma->vm_start, address, vma->vm_flags,
		 doorbell_process_allocation());


	return io_remap_pfn_range(vma,
				vma->vm_start,
				address >> PAGE_SHIFT,
				doorbell_process_allocation(),
				vma->vm_page_prot);
}


/* get kernel iomem pointer for a doorbell */
u32 __iomem *kfd_get_kernel_doorbell(struct kfd_dev *kfd,
					unsigned int *doorbell_off)
{
	u32 inx;

	BUG_ON(!kfd || !doorbell_off);

	mutex_lock(&doorbell_mutex);
	inx = find_first_zero_bit(doorbell_available_index,
					KFD_MAX_NUM_OF_QUEUES_PER_PROCESS);

	__set_bit(inx, doorbell_available_index);
	mutex_unlock(&doorbell_mutex);

	if (inx >= KFD_MAX_NUM_OF_QUEUES_PER_PROCESS)
		return NULL;

	/*
	 * Calculating the kernel doorbell offset using "faked" kernel
	 * pasid that allocated for kernel queues only
	 */
	*doorbell_off = KERNEL_DOORBELL_PASID * (doorbell_process_allocation() /
							sizeof(u32)) + inx;

	pr_debug("kfd: get kernel queue doorbell\n"
			 "     doorbell offset   == 0x%08d\n"
			 "     kernel address    == 0x%08lX\n",
		*doorbell_off, (uintptr_t)(kfd->doorbell_kernel_ptr + inx));

	return kfd->doorbell_kernel_ptr + inx;
}

void kfd_release_kernel_doorbell(struct kfd_dev *kfd, u32 __iomem *db_addr)
{
	unsigned int inx;

	BUG_ON(!kfd || !db_addr);

	inx = (unsigned int)(db_addr - kfd->doorbell_kernel_ptr);

	mutex_lock(&doorbell_mutex);
	__clear_bit(inx, doorbell_available_index);
	mutex_unlock(&doorbell_mutex);
}

inline void write_kernel_doorbell(u32 __iomem *db, u32 value)
{
	if (db) {
		writel(value, db);
		pr_debug("writing %d to doorbell address 0x%p\n", value, db);
	}
}

/*
 * queue_ids are in the range [0,MAX_PROCESS_QUEUES) and are mapped 1:1
 * to doorbells with the process's doorbell page
 */
unsigned int kfd_queue_id_to_doorbell(struct kfd_dev *kfd,
					struct kfd_process *process,
					unsigned int queue_id)
{
	/*
	 * doorbell_id_offset accounts for doorbells taken by KGD.
	 * pasid * doorbell_process_allocation/sizeof(u32) adjusts
	 * to the process's doorbells
	 */
	return kfd->doorbell_id_offset +
		process->pasid * (doorbell_process_allocation()/sizeof(u32)) +
		queue_id;
}

uint64_t kfd_get_number_elems(struct kfd_dev *kfd)
{
	uint64_t num_of_elems = (kfd->shared_resources.doorbell_aperture_size -
				kfd->shared_resources.doorbell_start_offset) /
					doorbell_process_allocation() + 1;

	return num_of_elems;

}

phys_addr_t kfd_get_process_doorbells(struct kfd_dev *dev,
					struct kfd_process *process)
{
	return dev->doorbell_base +
		process->pasid * doorbell_process_allocation();
}