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habanalabs: Allow accessing DRAM virtual addresses via debugfs 

The addr/data32 debugfs nodes currently permit the access to only physical
addresses of a device. This patch extends it and allows accessing also
device's DRAM virtual addresses.

Signed-off-by: Tomer Tayar <ttayar@habana.ai>
Signed-off-by: Oded Gabbay <oded.gabbay@gmail.com>
This commit is contained in:
Tomer Tayar 2019-03-12 13:53:17 +02:00 committed by Oded Gabbay
parent c811f7bc77
commit d75bcf3e5d
1 changed files with 91 additions and 5 deletions
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96
drivers/misc/habanalabs/debugfs.c
View File

@ -505,22 +505,97 @@ err:
return -EINVAL;
}
static int device_va_to_pa(struct hl_device *hdev, u64 virt_addr,
u64 *phys_addr)
{
struct hl_ctx *ctx = hdev->user_ctx;
u64 hop_addr, hop_pte_addr, hop_pte;
int rc = 0;
if (!ctx) {
dev_err(hdev->dev, "no ctx available\n");
return -EINVAL;
}
mutex_lock(&ctx->mmu_lock);
/* hop 0 */
hop_addr = get_hop0_addr(ctx);
hop_pte_addr = get_hop0_pte_addr(ctx, hop_addr, virt_addr);
hop_pte = hdev->asic_funcs->read_pte(hdev, hop_pte_addr);
/* hop 1 */
hop_addr = get_next_hop_addr(hop_pte);
if (hop_addr == ULLONG_MAX)
goto not_mapped;
hop_pte_addr = get_hop1_pte_addr(ctx, hop_addr, virt_addr);
hop_pte = hdev->asic_funcs->read_pte(hdev, hop_pte_addr);
/* hop 2 */
hop_addr = get_next_hop_addr(hop_pte);
if (hop_addr == ULLONG_MAX)
goto not_mapped;
hop_pte_addr = get_hop2_pte_addr(ctx, hop_addr, virt_addr);
hop_pte = hdev->asic_funcs->read_pte(hdev, hop_pte_addr);
/* hop 3 */
hop_addr = get_next_hop_addr(hop_pte);
if (hop_addr == ULLONG_MAX)
goto not_mapped;
hop_pte_addr = get_hop3_pte_addr(ctx, hop_addr, virt_addr);
hop_pte = hdev->asic_funcs->read_pte(hdev, hop_pte_addr);
if (!(hop_pte & LAST_MASK)) {
/* hop 4 */
hop_addr = get_next_hop_addr(hop_pte);
if (hop_addr == ULLONG_MAX)
goto not_mapped;
hop_pte_addr = get_hop4_pte_addr(ctx, hop_addr, virt_addr);
hop_pte = hdev->asic_funcs->read_pte(hdev, hop_pte_addr);
}
if (!(hop_pte & PAGE_PRESENT_MASK))
goto not_mapped;
*phys_addr = (hop_pte & PTE_PHYS_ADDR_MASK) | (virt_addr & OFFSET_MASK);
goto out;
not_mapped:
dev_err(hdev->dev, "virt addr 0x%llx is not mapped to phys addr\n",
virt_addr);
rc = -EINVAL;
out:
mutex_unlock(&ctx->mmu_lock);
return rc;
}
static ssize_t hl_data_read32(struct file *f, char __user *buf,
size_t count, loff_t *ppos)
{
struct hl_dbg_device_entry *entry = file_inode(f)->i_private;
struct hl_device *hdev = entry->hdev;
struct asic_fixed_properties *prop = &hdev->asic_prop;
char tmp_buf[32];
u64 addr = entry->addr;
u32 val;
ssize_t rc;
if (*ppos)
return 0;
rc = hdev->asic_funcs->debugfs_read32(hdev, entry->addr, &val);
if (addr >= prop->va_space_dram_start_address &&
addr < prop->va_space_dram_end_address &&
hdev->mmu_enable &&
hdev->dram_supports_virtual_memory) {
rc = device_va_to_pa(hdev, entry->addr, &addr);
if (rc)
return rc;
}
rc = hdev->asic_funcs->debugfs_read32(hdev, addr, &val);
if (rc) {
dev_err(hdev->dev, "Failed to read from 0x%010llx\n",
entry->addr);
dev_err(hdev->dev, "Failed to read from 0x%010llx\n", addr);
return rc;
}
@ -536,6 +611,8 @@ static ssize_t hl_data_write32(struct file *f, const char __user *buf,
{
struct hl_dbg_device_entry *entry = file_inode(f)->i_private;
struct hl_device *hdev = entry->hdev;
struct asic_fixed_properties *prop = &hdev->asic_prop;
u64 addr = entry->addr;
u32 value;
ssize_t rc;
@ -543,10 +620,19 @@ static ssize_t hl_data_write32(struct file *f, const char __user *buf,
if (rc)
return rc;
rc = hdev->asic_funcs->debugfs_write32(hdev, entry->addr, value);
if (addr >= prop->va_space_dram_start_address &&
addr < prop->va_space_dram_end_address &&
hdev->mmu_enable &&
hdev->dram_supports_virtual_memory) {
rc = device_va_to_pa(hdev, entry->addr, &addr);
if (rc)
return rc;
}
rc = hdev->asic_funcs->debugfs_write32(hdev, addr, value);
if (rc) {
dev_err(hdev->dev, "Failed to write 0x%08x to 0x%010llx\n",
value, entry->addr);
value, addr);
return rc;
}