diff options
| author | Tomer Tayar <ttayar@habana.ai> | 2019-06-16 16:48:29 +0300 |
|---|---|---|
| committer | Oded Gabbay <oded.gabbay@gmail.com> | 2019-06-16 16:48:29 +0300 |
| commit | 4a0ce7764b09044fdb5f92dcf03ec5d8657296f4 (patch) | |
| tree | 009d171c57d8625736a2709c9fe30c45a02666a8 /drivers/misc/habanalabs/goya | |
| parent | 747bf88c61772ec1e670ee04f4db6af15398c2ef (diff) | |
| download | linux-4a0ce7764b09044fdb5f92dcf03ec5d8657296f4.tar.xz | |
habanalabs: Allow accessing host mapped addresses via debugfs
Allows using the addr/data32 debugfs nodes to access a device VA of a
host mapped memory when the IOMMU is disabled.
Due to the possible large amount of a user host mapped memory, the
driver doesn't maintain a database with the host addresses per device VA.
When the IOMMU is disabled, this missing info is being overcome by
simply using phys_to_virt(). However, this is not useful when the IOMMU
is enabled, and thus the enforced limitation.
Signed-off-by: Tomer Tayar <ttayar@habana.ai>
Reviewed-by: Oded Gabbay <oded.gabbay@gmail.com>
Signed-off-by: Oded Gabbay <oded.gabbay@gmail.com>
Diffstat (limited to 'drivers/misc/habanalabs/goya')
| -rw-r--r-- | drivers/misc/habanalabs/goya/goya.c | 19 |
1 files changed, 15 insertions, 4 deletions
diff --git a/drivers/misc/habanalabs/goya/goya.c b/drivers/misc/habanalabs/goya/goya.c index e8b3a31d211f..ce127a6f606f 100644 --- a/drivers/misc/habanalabs/goya/goya.c +++ b/drivers/misc/habanalabs/goya/goya.c @@ -14,6 +14,7 @@ #include <linux/genalloc.h> #include <linux/hwmon.h> #include <linux/io-64-nonatomic-lo-hi.h> +#include <linux/iommu.h> /* * GOYA security scheme: @@ -3941,10 +3942,11 @@ static void goya_clear_sm_regs(struct hl_device *hdev) } /* - * goya_debugfs_read32 - read a 32bit value from a given device address + * goya_debugfs_read32 - read a 32bit value from a given device or a host mapped + * address. * * @hdev: pointer to hl_device structure - * @addr: address in device + * @addr: device or host mapped address * @val: returned value * * In case of DDR address that is not mapped into the default aperture that @@ -3985,6 +3987,10 @@ static int goya_debugfs_read32(struct hl_device *hdev, u64 addr, u32 *val) } if (ddr_bar_addr == U64_MAX) rc = -EIO; + + } else if (addr >= HOST_PHYS_BASE && !iommu_present(&pci_bus_type)) { + *val = *(u32 *) phys_to_virt(addr - HOST_PHYS_BASE); + } else { rc = -EFAULT; } @@ -3993,10 +3999,11 @@ static int goya_debugfs_read32(struct hl_device *hdev, u64 addr, u32 *val) } /* - * goya_debugfs_write32 - write a 32bit value to a given device address + * goya_debugfs_write32 - write a 32bit value to a given device or a host mapped + * address. * * @hdev: pointer to hl_device structure - * @addr: address in device + * @addr: device or host mapped address * @val: returned value * * In case of DDR address that is not mapped into the default aperture that @@ -4037,6 +4044,10 @@ static int goya_debugfs_write32(struct hl_device *hdev, u64 addr, u32 val) } if (ddr_bar_addr == U64_MAX) rc = -EIO; + + } else if (addr >= HOST_PHYS_BASE && !iommu_present(&pci_bus_type)) { + *(u32 *) phys_to_virt(addr - HOST_PHYS_BASE) = val; + } else { rc = -EFAULT; } |