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The usable framebuffer excludes GSP carveouts and other protected regions so may differ in size from BAR size and total physical VRAM. Signed-off-by: Alistair Popple --- drivers/gpu/drm/nova/file.rs | 1 + drivers/gpu/nova-core/auxdata.rs | 5 +++++ drivers/gpu/nova-core/gpu.rs | 6 ++---- drivers/gpu/nova-core/gsp/commands.rs | 8 ++++++++ include/uapi/drm/nova_drm.h | 7 +++++++ 5 files changed, 23 insertions(+), 4 deletions(-) diff --git a/drivers/gpu/drm/nova/file.rs b/drivers/gpu/drm/nova/file.rs index 8147dfb366d8..d6f7e21fbc48 100644 --- a/drivers/gpu/drm/nova/file.rs +++ b/drivers/gpu/drm/nova/file.rs @@ -44,6 +44,7 @@ pub(crate) fn get_param( let value = match getparam.param as u32 { uapi::NOVA_GETPARAM_VRAM_BAR_SIZE => pdev.resource_len(1)?, uapi::NOVA_GETPARAM_GPU_CHIPSET => data.chipset() as u64, + uapi::NOVA_GETPARAM_VRAM_SIZE => data.vram_size(), _ => return Err(EINVAL), }; diff --git a/drivers/gpu/nova-core/auxdata.rs b/drivers/gpu/nova-core/auxdata.rs index cd8a3511293b..0a07a10da327 100644 --- a/drivers/gpu/nova-core/auxdata.rs +++ b/drivers/gpu/nova-core/auxdata.rs @@ -17,4 +17,9 @@ impl AuxData<'_> { pub fn chipset(&self) -> Chipset { self.gpu.spec.chipset } + + /// Returns the total usable VRAM size of this GPU in bytes. + pub fn vram_size(&self) -> u64 { + self.gpu.gsp_static_info.vram_size() + } } diff --git a/drivers/gpu/nova-core/gpu.rs b/drivers/gpu/nova-core/gpu.rs index d4a71a1be6f1..a089843f6d0a 100644 --- a/drivers/gpu/nova-core/gpu.rs +++ b/drivers/gpu/nova-core/gpu.rs @@ -288,7 +288,7 @@ struct GspResources<'gpu> { pub(crate) struct Gpu<'gpu> { pub(crate) spec: Spec, /// Static GPU information as provided by the GSP. - gsp_static_info: GetGspStaticInfoReply, + pub(crate) gsp_static_info: GetGspStaticInfoReply, /// GSP and its resources. #[pin] gsp_resources: GspResources<'gpu>, @@ -388,9 +388,7 @@ pub(crate) fn new( dev_dbg!( pdev, "Total usable VRAM: {} MiB\n", - info.usable_fb_regions.iter().fold(0u64, |res, region| res - .saturating_add(region.end - region.start)) - / u64::SZ_1M + info.vram_size() / u64::SZ_1M ); } diff --git a/drivers/gpu/nova-core/gsp/commands.rs b/drivers/gpu/nova-core/gsp/commands.rs index 86a3747cd31c..e41227fc015d 100644 --- a/drivers/gpu/nova-core/gsp/commands.rs +++ b/drivers/gpu/nova-core/gsp/commands.rs @@ -242,6 +242,14 @@ pub(crate) fn gpu_name(&self) -> core::result::Result<&str, GpuNameError> { .to_str() .map_err(GpuNameError::InvalidUtf8) } + + /// Returns the total usable VRAM size in bytes, i.e. the summed lengths of all usable FB + /// regions. + pub(crate) fn vram_size(&self) -> u64 { + self.usable_fb_regions + .iter() + .fold(0, |size, region| size.saturating_add(region.end - region.start)) + } } pub(crate) use fw::commands::PowerStateLevel; diff --git a/include/uapi/drm/nova_drm.h b/include/uapi/drm/nova_drm.h index 63440f5dca9b..eb98817906a8 100644 --- a/include/uapi/drm/nova_drm.h +++ b/include/uapi/drm/nova_drm.h @@ -32,6 +32,13 @@ extern "C" { */ #define NOVA_GETPARAM_GPU_CHIPSET 0x2 +/* + * NOVA_GETPARAM_VRAM_SIZE + * + * Query the total usable VRAM size in bytes. + */ +#define NOVA_GETPARAM_VRAM_SIZE 0x3 + /** * struct drm_nova_getparam - query GPU and driver metadata */ -- 2.54.0