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SubjectRe: [PATCH 03/15] habanalabs: add basic Goya support
On Fri, Jan 25, 2019 at 10:32:55PM +0200, Oded Gabbay wrote:
> On Wed, Jan 23, 2019 at 2:28 PM Mike Rapoport <rppt@linux.ibm.com> wrote:
> >
> > On Wed, Jan 23, 2019 at 02:00:45AM +0200, Oded Gabbay wrote:
> > > This patch adds a basic support for the Goya device. The code initializes
> > > the device's PCI controller and PCI bars. It also initializes various S/W
> > > structures and adds some basic helper functions.
> > >
> > > Signed-off-by: Oded Gabbay <oded.gabbay@gmail.com>
> > > ---
> > > drivers/misc/habanalabs/Makefile | 5 +-
> > > drivers/misc/habanalabs/device.c | 71 +++
> > > drivers/misc/habanalabs/goya/Makefile | 3 +
> > > drivers/misc/habanalabs/goya/goya.c | 633 ++++++++++++++++++++
> > > drivers/misc/habanalabs/goya/goyaP.h | 125 ++++
> > > drivers/misc/habanalabs/habanalabs.h | 131 ++++
> > > drivers/misc/habanalabs/habanalabs_drv.c | 3 +
> > > drivers/misc/habanalabs/include/goya/goya.h | 115 ++++
> > > 8 files changed, 1085 insertions(+), 1 deletion(-)
> > > create mode 100644 drivers/misc/habanalabs/goya/Makefile
> > > create mode 100644 drivers/misc/habanalabs/goya/goya.c
> > > create mode 100644 drivers/misc/habanalabs/goya/goyaP.h
> > > create mode 100644 drivers/misc/habanalabs/include/goya/goya.h

[ ... ]

> > > +
> > > +/**
> > > + * goya_sw_init - Goya software initialization code
> > > + *
> > > + * @hdev: pointer to hl_device structure
> > > + *
> > > + */
> > > +static int goya_sw_init(struct hl_device *hdev)
> > > +{
> > > + struct goya_device *goya;
> > > + int rc;
> > > +
> > > + /* Allocate device structure */
> > > + goya = kzalloc(sizeof(*goya), GFP_KERNEL);
> >
> > Consider using devm_k[mz]alloc() for memory allocations throughout the
> > driver. I didn't check all the spots where it can be applicable.
> I honestly wasn't aware of that. We never used that in AMD drivers
> (which where I spent most of my kernel time).
> I'll look into that offline but for now I don't really want to change
> into it blindly in all locations, unless there is some hard kernel
> rule for using that in drivers.

AFAIK, there's no such rule. It's just supposed to make driver
developer/maintainer life easier ;-)

> >
> > > + if (!goya)
> > > + return -ENOMEM;
> > > +
> > > + /* according to goya_init_iatu */
> > > + goya->ddr_bar_cur_addr = DRAM_PHYS_BASE;
> > > + hdev->asic_specific = goya;
> > > +
> > > + /* Create DMA pool for small allocations */
> > > + hdev->dma_pool = dma_pool_create(dev_name(hdev->dev),
> > > + &hdev->pdev->dev, GOYA_DMA_POOL_BLK_SIZE, 8, 0);
> > > + if (!hdev->dma_pool) {
> > > + dev_err(hdev->dev, "failed to create DMA pool\n");
> > > + rc = -ENOMEM;
> > > + goto free_goya_device;
> > > + }
> > > +

[ ... ]

> > > +
> > > +static const struct hl_asic_funcs goya_funcs = {
> > > + .early_init = goya_early_init,
> > > + .early_fini = goya_early_fini,
> > > + .sw_init = goya_sw_init,
> > > + .sw_fini = goya_sw_fini,
> > > + .suspend = goya_suspend,
> > > + .resume = goya_resume,
> > > + .dma_alloc_coherent = goya_dma_alloc_coherent,
> > > + .dma_free_coherent = goya_dma_free_coherent,
> >
> > Is there any additional functionality that is planned in goya or gaudi in
> > these two functions?
> > It seems like they are not really needed, at least at the moment and for
> > sure that don't need to be part of ASIC ops.
>
> So this relates to the simulator support, because there the
> implementation of these two functions is totally different as I don't
> have pci device.

Can you please add a comment about it here?

--
Sincerely yours,
Mike.

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